Merge tag 'idmapped-mounts-v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux

Pull idmapped mounts from Christian Brauner:
 "This introduces idmapped mounts which has been in the making for some
  time. Simply put, different mounts can expose the same file or
  directory with different ownership. This initial implementation comes
  with ports for fat, ext4 and with Christoph's port for xfs with more
  filesystems being actively worked on by independent people and
  maintainers.

  Idmapping mounts handle a wide range of long standing use-cases. Here
  are just a few:

   - Idmapped mounts make it possible to easily share files between
     multiple users or multiple machines especially in complex
     scenarios. For example, idmapped mounts will be used in the
     implementation of portable home directories in
     systemd-homed.service(8) where they allow users to move their home
     directory to an external storage device and use it on multiple
     computers where they are assigned different uids and gids. This
     effectively makes it possible to assign random uids and gids at
     login time.

   - It is possible to share files from the host with unprivileged
     containers without having to change ownership permanently through
     chown(2).

   - It is possible to idmap a container's rootfs and without having to
     mangle every file. For example, Chromebooks use it to share the
     user's Download folder with their unprivileged containers in their
     Linux subsystem.

   - It is possible to share files between containers with
     non-overlapping idmappings.

   - Filesystem that lack a proper concept of ownership such as fat can
     use idmapped mounts to implement discretionary access (DAC)
     permission checking.

   - They allow users to efficiently changing ownership on a per-mount
     basis without having to (recursively) chown(2) all files. In
     contrast to chown (2) changing ownership of large sets of files is
     instantenous with idmapped mounts. This is especially useful when
     ownership of a whole root filesystem of a virtual machine or
     container is changed. With idmapped mounts a single syscall
     mount_setattr syscall will be sufficient to change the ownership of
     all files.

   - Idmapped mounts always take the current ownership into account as
     idmappings specify what a given uid or gid is supposed to be mapped
     to. This contrasts with the chown(2) syscall which cannot by itself
     take the current ownership of the files it changes into account. It
     simply changes the ownership to the specified uid and gid. This is
     especially problematic when recursively chown(2)ing a large set of
     files which is commong with the aforementioned portable home
     directory and container and vm scenario.

   - Idmapped mounts allow to change ownership locally, restricting it
     to specific mounts, and temporarily as the ownership changes only
     apply as long as the mount exists.

  Several userspace projects have either already put up patches and
  pull-requests for this feature or will do so should you decide to pull
  this:

   - systemd: In a wide variety of scenarios but especially right away
     in their implementation of portable home directories.

         https://systemd.io/HOME_DIRECTORY/

   - container runtimes: containerd, runC, LXD:To share data between
     host and unprivileged containers, unprivileged and privileged
     containers, etc. The pull request for idmapped mounts support in
     containerd, the default Kubernetes runtime is already up for quite
     a while now: https://github.com/containerd/containerd/pull/4734

   - The virtio-fs developers and several users have expressed interest
     in using this feature with virtual machines once virtio-fs is
     ported.

   - ChromeOS: Sharing host-directories with unprivileged containers.

  I've tightly synced with all those projects and all of those listed
  here have also expressed their need/desire for this feature on the
  mailing list. For more info on how people use this there's a bunch of
  talks about this too. Here's just two recent ones:

      https://www.cncf.io/wp-content/uploads/2020/12/Rootless-Containers-in-Gitpod.pdf
      https://fosdem.org/2021/schedule/event/containers_idmap/

  This comes with an extensive xfstests suite covering both ext4 and
  xfs:

      https://git.kernel.org/brauner/xfstests-dev/h/idmapped_mounts

  It covers truncation, creation, opening, xattrs, vfscaps, setid
  execution, setgid inheritance and more both with idmapped and
  non-idmapped mounts. It already helped to discover an unrelated xfs
  setgid inheritance bug which has since been fixed in mainline. It will
  be sent for inclusion with the xfstests project should you decide to
  merge this.

  In order to support per-mount idmappings vfsmounts are marked with
  user namespaces. The idmapping of the user namespace will be used to
  map the ids of vfs objects when they are accessed through that mount.
  By default all vfsmounts are marked with the initial user namespace.
  The initial user namespace is used to indicate that a mount is not
  idmapped. All operations behave as before and this is verified in the
  testsuite.

  Based on prior discussions we want to attach the whole user namespace
  and not just a dedicated idmapping struct. This allows us to reuse all
  the helpers that already exist for dealing with idmappings instead of
  introducing a whole new range of helpers. In addition, if we decide in
  the future that we are confident enough to enable unprivileged users
  to setup idmapped mounts the permission checking can take into account
  whether the caller is privileged in the user namespace the mount is
  currently marked with.

  The user namespace the mount will be marked with can be specified by
  passing a file descriptor refering to the user namespace as an
  argument to the new mount_setattr() syscall together with the new
  MOUNT_ATTR_IDMAP flag. The system call follows the openat2() pattern
  of extensibility.

  The following conditions must be met in order to create an idmapped
  mount:

   - The caller must currently have the CAP_SYS_ADMIN capability in the
     user namespace the underlying filesystem has been mounted in.

   - The underlying filesystem must support idmapped mounts.

   - The mount must not already be idmapped. This also implies that the
     idmapping of a mount cannot be altered once it has been idmapped.

   - The mount must be a detached/anonymous mount, i.e. it must have
     been created by calling open_tree() with the OPEN_TREE_CLONE flag
     and it must not already have been visible in the filesystem.

  The last two points guarantee easier semantics for userspace and the
  kernel and make the implementation significantly simpler.

  By default vfsmounts are marked with the initial user namespace and no
  behavioral or performance changes are observed.

  The manpage with a detailed description can be found here:

      https://git.kernel.org/brauner/man-pages/c/1d7b902e2875a1ff342e036a9f866a995640aea8

  In order to support idmapped mounts, filesystems need to be changed
  and mark themselves with the FS_ALLOW_IDMAP flag in fs_flags. The
  patches to convert individual filesystem are not very large or
  complicated overall as can be seen from the included fat, ext4, and
  xfs ports. Patches for other filesystems are actively worked on and
  will be sent out separately. The xfstestsuite can be used to verify
  that port has been done correctly.

  The mount_setattr() syscall is motivated independent of the idmapped
  mounts patches and it's been around since July 2019. One of the most
  valuable features of the new mount api is the ability to perform
  mounts based on file descriptors only.

  Together with the lookup restrictions available in the openat2()
  RESOLVE_* flag namespace which we added in v5.6 this is the first time
  we are close to hardened and race-free (e.g. symlinks) mounting and
  path resolution.

  While userspace has started porting to the new mount api to mount
  proper filesystems and create new bind-mounts it is currently not
  possible to change mount options of an already existing bind mount in
  the new mount api since the mount_setattr() syscall is missing.

  With the addition of the mount_setattr() syscall we remove this last
  restriction and userspace can now fully port to the new mount api,
  covering every use-case the old mount api could. We also add the
  crucial ability to recursively change mount options for a whole mount
  tree, both removing and adding mount options at the same time. This
  syscall has been requested multiple times by various people and
  projects.

  There is a simple tool available at

      https://github.com/brauner/mount-idmapped

  that allows to create idmapped mounts so people can play with this
  patch series. I'll add support for the regular mount binary should you
  decide to pull this in the following weeks:

  Here's an example to a simple idmapped mount of another user's home
  directory:

	u1001@f2-vm:/$ sudo ./mount --idmap both:1000:1001:1 /home/ubuntu/ /mnt

	u1001@f2-vm:/$ ls -al /home/ubuntu/
	total 28
	drwxr-xr-x 2 ubuntu ubuntu 4096 Oct 28 22:07 .
	drwxr-xr-x 4 root   root   4096 Oct 28 04:00 ..
	-rw------- 1 ubuntu ubuntu 3154 Oct 28 22:12 .bash_history
	-rw-r--r-- 1 ubuntu ubuntu  220 Feb 25  2020 .bash_logout
	-rw-r--r-- 1 ubuntu ubuntu 3771 Feb 25  2020 .bashrc
	-rw-r--r-- 1 ubuntu ubuntu  807 Feb 25  2020 .profile
	-rw-r--r-- 1 ubuntu ubuntu    0 Oct 16 16:11 .sudo_as_admin_successful
	-rw------- 1 ubuntu ubuntu 1144 Oct 28 00:43 .viminfo

	u1001@f2-vm:/$ ls -al /mnt/
	total 28
	drwxr-xr-x  2 u1001 u1001 4096 Oct 28 22:07 .
	drwxr-xr-x 29 root  root  4096 Oct 28 22:01 ..
	-rw-------  1 u1001 u1001 3154 Oct 28 22:12 .bash_history
	-rw-r--r--  1 u1001 u1001  220 Feb 25  2020 .bash_logout
	-rw-r--r--  1 u1001 u1001 3771 Feb 25  2020 .bashrc
	-rw-r--r--  1 u1001 u1001  807 Feb 25  2020 .profile
	-rw-r--r--  1 u1001 u1001    0 Oct 16 16:11 .sudo_as_admin_successful
	-rw-------  1 u1001 u1001 1144 Oct 28 00:43 .viminfo

	u1001@f2-vm:/$ touch /mnt/my-file

	u1001@f2-vm:/$ setfacl -m u:1001:rwx /mnt/my-file

	u1001@f2-vm:/$ sudo setcap -n 1001 cap_net_raw+ep /mnt/my-file

	u1001@f2-vm:/$ ls -al /mnt/my-file
	-rw-rwxr--+ 1 u1001 u1001 0 Oct 28 22:14 /mnt/my-file

	u1001@f2-vm:/$ ls -al /home/ubuntu/my-file
	-rw-rwxr--+ 1 ubuntu ubuntu 0 Oct 28 22:14 /home/ubuntu/my-file

	u1001@f2-vm:/$ getfacl /mnt/my-file
	getfacl: Removing leading '/' from absolute path names
	# file: mnt/my-file
	# owner: u1001
	# group: u1001
	user::rw-
	user:u1001:rwx
	group::rw-
	mask::rwx
	other::r--

	u1001@f2-vm:/$ getfacl /home/ubuntu/my-file
	getfacl: Removing leading '/' from absolute path names
	# file: home/ubuntu/my-file
	# owner: ubuntu
	# group: ubuntu
	user::rw-
	user:ubuntu:rwx
	group::rw-
	mask::rwx
	other::r--"

* tag 'idmapped-mounts-v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux: (41 commits)
  xfs: remove the possibly unused mp variable in xfs_file_compat_ioctl
  xfs: support idmapped mounts
  ext4: support idmapped mounts
  fat: handle idmapped mounts
  tests: add mount_setattr() selftests
  fs: introduce MOUNT_ATTR_IDMAP
  fs: add mount_setattr()
  fs: add attr_flags_to_mnt_flags helper
  fs: split out functions to hold writers
  namespace: only take read lock in do_reconfigure_mnt()
  mount: make {lock,unlock}_mount_hash() static
  namespace: take lock_mount_hash() directly when changing flags
  nfs: do not export idmapped mounts
  overlayfs: do not mount on top of idmapped mounts
  ecryptfs: do not mount on top of idmapped mounts
  ima: handle idmapped mounts
  apparmor: handle idmapped mounts
  fs: make helpers idmap mount aware
  exec: handle idmapped mounts
  would_dump: handle idmapped mounts
  ...

269 files changed, 2818 insertions, 1471 deletions

diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index 6261719f6f2a..bb1b286c49ae 100644
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -239,6 +239,7 @@ static int v9fs_xattr_get_acl(const struct xattr_handler *handler,
 }
 
 static int v9fs_xattr_set_acl(const struct xattr_handler *handler,
+			      struct user_namespace *mnt_userns,
 			      struct dentry *dentry, struct inode *inode,
 			      const char *name, const void *value,
 			      size_t size, int flags)
@@ -258,7 +259,7 @@ static int v9fs_xattr_set_acl(const struct xattr_handler *handler,
 
 	if (S_ISLNK(inode->i_mode))
 		return -EOPNOTSUPP;
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EPERM;
 	if (value) {
 		/* update the cached acl value */
@@ -279,7 +280,8 @@ static int v9fs_xattr_set_acl(const struct xattr_handler *handler,
 			struct iattr iattr = { 0 };
 			struct posix_acl *old_acl = acl;
 
-			retval = posix_acl_update_mode(inode, &iattr.ia_mode, &acl);
+			retval = posix_acl_update_mode(&init_user_ns, inode,
+						       &iattr.ia_mode, &acl);
 			if (retval)
 				goto err_out;
 			if (!acl) {
@@ -297,7 +299,7 @@ static int v9fs_xattr_set_acl(const struct xattr_handler *handler,
 			 * What is the following setxattr update the
 			 * mode ?
 			 */
-			v9fs_vfs_setattr_dotl(dentry, &iattr);
+			v9fs_vfs_setattr_dotl(&init_user_ns, dentry, &iattr);
 		}
 		break;
 	case ACL_TYPE_DEFAULT:
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index 7b763776306e..4ca56c5dd637 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -135,7 +135,8 @@ extern struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 			unsigned int flags);
 extern int v9fs_vfs_unlink(struct inode *i, struct dentry *d);
 extern int v9fs_vfs_rmdir(struct inode *i, struct dentry *d);
-extern int v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
+extern int v9fs_vfs_rename(struct user_namespace *mnt_userns,
+			   struct inode *old_dir, struct dentry *old_dentry,
 			   struct inode *new_dir, struct dentry *new_dentry,
 			   unsigned int flags);
 extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses,
diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
index fd2a2b040250..d44ade76966a 100644
--- a/fs/9p/v9fs_vfs.h
+++ b/fs/9p/v9fs_vfs.h
@@ -59,7 +59,8 @@ void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
 int v9fs_uflags2omode(int uflags, int extended);
 
 void v9fs_blank_wstat(struct p9_wstat *wstat);
-int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *);
+int v9fs_vfs_setattr_dotl(struct user_namespace *, struct dentry *,
+			  struct iattr *);
 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
 			 int datasync);
 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode);
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 4a937fac1acb..648eb4c4cf7f 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -251,7 +251,7 @@ int v9fs_init_inode(struct v9fs_session_info *v9ses,
 {
 	int err = 0;
 
-	inode_init_owner(inode, NULL, mode);
+	inode_init_owner(&init_user_ns,inode,  NULL, mode);
 	inode->i_blocks = 0;
 	inode->i_rdev = rdev;
 	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
@@ -676,8 +676,8 @@ error:
  */
 
 static int
-v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		bool excl)
+v9fs_vfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+		struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
 	u32 perm = unixmode2p9mode(v9ses, mode);
@@ -702,7 +702,8 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
  *
  */
 
-static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int v9fs_vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+			  struct dentry *dentry, umode_t mode)
 {
 	int err;
 	u32 perm;
@@ -907,9 +908,9 @@ int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
  */
 
 int
-v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
-		struct inode *new_dir, struct dentry *new_dentry,
-		unsigned int flags)
+v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		struct dentry *old_dentry, struct inode *new_dir,
+		struct dentry *new_dentry, unsigned int flags)
 {
 	int retval;
 	struct inode *old_inode;
@@ -1016,8 +1017,8 @@ done:
  */
 
 static int
-v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
-		 u32 request_mask, unsigned int flags)
+v9fs_vfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		 struct kstat *stat, u32 request_mask, unsigned int flags)
 {
 	struct dentry *dentry = path->dentry;
 	struct v9fs_session_info *v9ses;
@@ -1027,7 +1028,7 @@ v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
 	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 	v9ses = v9fs_dentry2v9ses(dentry);
 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
-		generic_fillattr(d_inode(dentry), stat);
+		generic_fillattr(&init_user_ns, d_inode(dentry), stat);
 		return 0;
 	}
 	fid = v9fs_fid_lookup(dentry);
@@ -1040,7 +1041,7 @@ v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
 		return PTR_ERR(st);
 
 	v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
-	generic_fillattr(d_inode(dentry), stat);
+	generic_fillattr(&init_user_ns, d_inode(dentry), stat);
 
 	p9stat_free(st);
 	kfree(st);
@@ -1054,7 +1055,8 @@ v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
  *
  */
 
-static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
+static int v9fs_vfs_setattr(struct user_namespace *mnt_userns,
+			    struct dentry *dentry, struct iattr *iattr)
 {
 	int retval, use_dentry = 0;
 	struct v9fs_session_info *v9ses;
@@ -1062,7 +1064,7 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
 	struct p9_wstat wstat;
 
 	p9_debug(P9_DEBUG_VFS, "\n");
-	retval = setattr_prepare(dentry, iattr);
+	retval = setattr_prepare(&init_user_ns, dentry, iattr);
 	if (retval)
 		return retval;
 
@@ -1118,7 +1120,7 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
 
 	v9fs_invalidate_inode_attr(d_inode(dentry));
 
-	setattr_copy(d_inode(dentry), iattr);
+	setattr_copy(&init_user_ns, d_inode(dentry), iattr);
 	mark_inode_dirty(d_inode(dentry));
 	return 0;
 }
@@ -1295,7 +1297,8 @@ static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
  */
 
 static int
-v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
+v9fs_vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+		 struct dentry *dentry, const char *symname)
 {
 	p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
 		 dir->i_ino, dentry, symname);
@@ -1348,7 +1351,8 @@ v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
  */
 
 static int
-v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
+v9fs_vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+	       struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
 	int retval;
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 823c2eb5f1bf..1dc7af046615 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -33,8 +33,8 @@
 #include "acl.h"
 
 static int
-v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
-		    dev_t rdev);
+v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
+		    struct dentry *dentry, umode_t omode, dev_t rdev);
 
 /**
  * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
@@ -218,10 +218,10 @@ int v9fs_open_to_dotl_flags(int flags)
  */
 
 static int
-v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
-		bool excl)
+v9fs_vfs_create_dotl(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, umode_t omode, bool excl)
 {
-	return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
+	return v9fs_vfs_mknod_dotl(mnt_userns, dir, dentry, omode, 0);
 }
 
 static int
@@ -367,8 +367,9 @@ err_clunk_old_fid:
  *
  */
 
-static int v9fs_vfs_mkdir_dotl(struct inode *dir,
-			       struct dentry *dentry, umode_t omode)
+static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns,
+			       struct inode *dir, struct dentry *dentry,
+			       umode_t omode)
 {
 	int err;
 	struct v9fs_session_info *v9ses;
@@ -457,8 +458,9 @@ error:
 }
 
 static int
-v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
-		 u32 request_mask, unsigned int flags)
+v9fs_vfs_getattr_dotl(struct user_namespace *mnt_userns,
+		      const struct path *path, struct kstat *stat,
+		      u32 request_mask, unsigned int flags)
 {
 	struct dentry *dentry = path->dentry;
 	struct v9fs_session_info *v9ses;
@@ -468,7 +470,7 @@ v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
 	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 	v9ses = v9fs_dentry2v9ses(dentry);
 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
-		generic_fillattr(d_inode(dentry), stat);
+		generic_fillattr(&init_user_ns, d_inode(dentry), stat);
 		return 0;
 	}
 	fid = v9fs_fid_lookup(dentry);
@@ -485,7 +487,7 @@ v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
 		return PTR_ERR(st);
 
 	v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
-	generic_fillattr(d_inode(dentry), stat);
+	generic_fillattr(&init_user_ns, d_inode(dentry), stat);
 	/* Change block size to what the server returned */
 	stat->blksize = st->st_blksize;
 
@@ -540,7 +542,8 @@ static int v9fs_mapped_iattr_valid(int iattr_valid)
  *
  */
 
-int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
+int v9fs_vfs_setattr_dotl(struct user_namespace *mnt_userns,
+			  struct dentry *dentry, struct iattr *iattr)
 {
 	int retval, use_dentry = 0;
 	struct p9_fid *fid = NULL;
@@ -549,7 +552,7 @@ int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 
 	p9_debug(P9_DEBUG_VFS, "\n");
 
-	retval = setattr_prepare(dentry, iattr);
+	retval = setattr_prepare(&init_user_ns, dentry, iattr);
 	if (retval)
 		return retval;
 
@@ -590,7 +593,7 @@ int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 		truncate_setsize(inode, iattr->ia_size);
 
 	v9fs_invalidate_inode_attr(inode);
-	setattr_copy(inode, iattr);
+	setattr_copy(&init_user_ns, inode, iattr);
 	mark_inode_dirty(inode);
 	if (iattr->ia_valid & ATTR_MODE) {
 		/* We also want to update ACL when we update mode bits */
@@ -684,8 +687,8 @@ v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
 }
 
 static int
-v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
-		const char *symname)
+v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, const char *symname)
 {
 	int err;
 	kgid_t gid;
@@ -824,8 +827,8 @@ v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
  *
  */
 static int
-v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
-		dev_t rdev)
+v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
+		    struct dentry *dentry, umode_t omode, dev_t rdev)
 {
 	int err;
 	kgid_t gid;
diff --git a/fs/9p/xattr.c b/fs/9p/xattr.c
index 87217dd0433e..ee331845e2c7 100644
--- a/fs/9p/xattr.c
+++ b/fs/9p/xattr.c
@@ -157,6 +157,7 @@ static int v9fs_xattr_handler_get(const struct xattr_handler *handler,
 }
 
 static int v9fs_xattr_handler_set(const struct xattr_handler *handler,
+				  struct user_namespace *mnt_userns,
 				  struct dentry *dentry, struct inode *inode,
 				  const char *name, const void *value,
 				  size_t size, int flags)
diff --git a/fs/adfs/adfs.h b/fs/adfs/adfs.h
index 699c4fa8b78b..06b7c92343ad 100644
--- a/fs/adfs/adfs.h
+++ b/fs/adfs/adfs.h
@@ -144,7 +144,8 @@ struct adfs_discmap {
 /* Inode stuff */
 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
-int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
+int adfs_notify_change(struct user_namespace *mnt_userns, struct dentry *dentry,
+		       struct iattr *attr);
 
 /* map.c */
 int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset);
diff --git a/fs/adfs/inode.c b/fs/adfs/inode.c
index 32620f4a7623..fb7ee026d101 100644
--- a/fs/adfs/inode.c
+++ b/fs/adfs/inode.c
@@ -292,14 +292,15 @@ out:
  * later.
  */
 int
-adfs_notify_change(struct dentry *dentry, struct iattr *attr)
+adfs_notify_change(struct user_namespace *mnt_userns, struct dentry *dentry,
+		   struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct super_block *sb = inode->i_sb;
 	unsigned int ia_valid = attr->ia_valid;
 	int error;
 	
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 
 	/*
 	 * we can't change the UID or GID of any file -
diff --git a/fs/affs/affs.h b/fs/affs/affs.h
index a755bef7c4c7..bfa89e131ead 100644
--- a/fs/affs/affs.h
+++ b/fs/affs/affs.h
@@ -167,27 +167,33 @@ extern const struct export_operations affs_export_ops;
 extern int	affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
 extern int	affs_unlink(struct inode *dir, struct dentry *dentry);
-extern int	affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool);
-extern int	affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
+extern int	affs_create(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode, bool);
+extern int	affs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode);
 extern int	affs_rmdir(struct inode *dir, struct dentry *dentry);
 extern int	affs_link(struct dentry *olddentry, struct inode *dir,
 			  struct dentry *dentry);
-extern int	affs_symlink(struct inode *dir, struct dentry *dentry,
-			     const char *symname);
-extern int	affs_rename2(struct inode *old_dir, struct dentry *old_dentry,
-			    struct inode *new_dir, struct dentry *new_dentry,
-			    unsigned int flags);
+extern int	affs_symlink(struct user_namespace *mnt_userns,
+			struct inode *dir, struct dentry *dentry,
+			const char *symname);
+extern int	affs_rename2(struct user_namespace *mnt_userns,
+			struct inode *old_dir, struct dentry *old_dentry,
+			struct inode *new_dir, struct dentry *new_dentry,
+			unsigned int flags);
 
 /* inode.c */
 
 extern struct inode		*affs_new_inode(struct inode *dir);
-extern int			 affs_notify_change(struct dentry *dentry, struct iattr *attr);
+extern int			 affs_notify_change(struct user_namespace *mnt_userns,
+					struct dentry *dentry, struct iattr *attr);
 extern void			 affs_evict_inode(struct inode *inode);
 extern struct inode		*affs_iget(struct super_block *sb,
 					unsigned long ino);
 extern int			 affs_write_inode(struct inode *inode,
 					struct writeback_control *wbc);
-extern int			 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
+extern int			 affs_add_entry(struct inode *dir, struct inode *inode,
+					struct dentry *dentry, s32 type);
 
 /* file.c */
 
diff --git a/fs/affs/inode.c b/fs/affs/inode.c
index 044412110b52..2352a75bd9d6 100644
--- a/fs/affs/inode.c
+++ b/fs/affs/inode.c
@@ -216,14 +216,15 @@ affs_write_inode(struct inode *inode, struct writeback_control *wbc)
 }
 
 int
-affs_notify_change(struct dentry *dentry, struct iattr *attr)
+affs_notify_change(struct user_namespace *mnt_userns, struct dentry *dentry,
+		   struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error;
 
 	pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		goto out;
 
@@ -249,7 +250,7 @@ affs_notify_change(struct dentry *dentry, struct iattr *attr)
 		affs_truncate(inode);
 	}
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 
 	if (attr->ia_valid & ATTR_MODE)
diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index 5400a876d73f..bcab18956b4f 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -242,7 +242,8 @@ affs_unlink(struct inode *dir, struct dentry *dentry)
 }
 
 int
-affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
+affs_create(struct user_namespace *mnt_userns, struct inode *dir,
+	    struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct super_block *sb = dir->i_sb;
 	struct inode	*inode;
@@ -273,7 +274,8 @@ affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
 }
 
 int
-affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+affs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+	   struct dentry *dentry, umode_t mode)
 {
 	struct inode		*inode;
 	int			 error;
@@ -311,7 +313,8 @@ affs_rmdir(struct inode *dir, struct dentry *dentry)
 }
 
 int
-affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
+affs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+	     struct dentry *dentry, const char *symname)
 {
 	struct super_block	*sb = dir->i_sb;
 	struct buffer_head	*bh;
@@ -500,9 +503,9 @@ done:
 	return retval;
 }
 
-int affs_rename2(struct inode *old_dir, struct dentry *old_dentry,
-			struct inode *new_dir, struct dentry *new_dentry,
-			unsigned int flags)
+int affs_rename2(struct user_namespace *mnt_userns, struct inode *old_dir,
+		 struct dentry *old_dentry, struct inode *new_dir,
+		 struct dentry *new_dentry, unsigned int flags)
 {
 
 	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 7bd659ad959e..714fcca9af99 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -28,18 +28,19 @@ static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int
 				  loff_t fpos, u64 ino, unsigned dtype);
 static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
 			      loff_t fpos, u64 ino, unsigned dtype);
-static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		      bool excl);
-static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
+static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, bool excl);
+static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, umode_t mode);
 static int afs_rmdir(struct inode *dir, struct dentry *dentry);
 static int afs_unlink(struct inode *dir, struct dentry *dentry);
 static int afs_link(struct dentry *from, struct inode *dir,
 		    struct dentry *dentry);
-static int afs_symlink(struct inode *dir, struct dentry *dentry,
-		       const char *content);
-static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
-		      struct inode *new_dir, struct dentry *new_dentry,
-		      unsigned int flags);
+static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, const char *content);
+static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		      struct dentry *old_dentry, struct inode *new_dir,
+		      struct dentry *new_dentry, unsigned int flags);
 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags);
 static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
 				   unsigned int length);
@@ -1325,7 +1326,8 @@ static const struct afs_operation_ops afs_mkdir_operation = {
 /*
  * create a directory on an AFS filesystem
  */
-static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, umode_t mode)
 {
 	struct afs_operation *op;
 	struct afs_vnode *dvnode = AFS_FS_I(dir);
@@ -1619,8 +1621,8 @@ static const struct afs_operation_ops afs_create_operation = {
 /*
  * create a regular file on an AFS filesystem
  */
-static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		      bool excl)
+static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct afs_operation *op;
 	struct afs_vnode *dvnode = AFS_FS_I(dir);
@@ -1741,8 +1743,8 @@ static const struct afs_operation_ops afs_symlink_operation = {
 /*
  * create a symlink in an AFS filesystem
  */
-static int afs_symlink(struct inode *dir, struct dentry *dentry,
-		       const char *content)
+static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, const char *content)
 {
 	struct afs_operation *op;
 	struct afs_vnode *dvnode = AFS_FS_I(dir);
@@ -1876,9 +1878,9 @@ static const struct afs_operation_ops afs_rename_operation = {
 /*
  * rename a file in an AFS filesystem and/or move it between directories
  */
-static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
-		      struct inode *new_dir, struct dentry *new_dentry,
-		      unsigned int flags)
+static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		      struct dentry *old_dentry, struct inode *new_dir,
+		      struct dentry *new_dentry, unsigned int flags)
 {
 	struct afs_operation *op;
 	struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index b0d7b892090d..1156b2df28d3 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -734,8 +734,8 @@ error_unlock:
 /*
  * read the attributes of an inode
  */
-int afs_getattr(const struct path *path, struct kstat *stat,
-		u32 request_mask, unsigned int query_flags)
+int afs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		struct kstat *stat, u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct afs_vnode *vnode = AFS_FS_I(inode);
@@ -745,7 +745,7 @@ int afs_getattr(const struct path *path, struct kstat *stat,
 
 	do {
 		read_seqbegin_or_lock(&vnode->cb_lock, &seq);
-		generic_fillattr(inode, stat);
+		generic_fillattr(&init_user_ns, inode, stat);
 		if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
 		    stat->nlink > 0)
 			stat->nlink -= 1;
@@ -857,7 +857,8 @@ static const struct afs_operation_ops afs_setattr_operation = {
 /*
  * set the attributes of an inode
  */
-int afs_setattr(struct dentry *dentry, struct iattr *attr)
+int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		struct iattr *attr)
 {
 	struct afs_operation *op;
 	struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 0d150a29e39e..b626e38e9ab5 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -1149,8 +1149,9 @@ extern struct inode *afs_iget(struct afs_operation *, struct afs_vnode_param *);
 extern struct inode *afs_root_iget(struct super_block *, struct key *);
 extern bool afs_check_validity(struct afs_vnode *);
 extern int afs_validate(struct afs_vnode *, struct key *);
-extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int);
-extern int afs_setattr(struct dentry *, struct iattr *);
+extern int afs_getattr(struct user_namespace *mnt_userns, const struct path *,
+		       struct kstat *, u32, unsigned int);
+extern int afs_setattr(struct user_namespace *mnt_userns, struct dentry *, struct iattr *);
 extern void afs_evict_inode(struct inode *);
 extern int afs_drop_inode(struct inode *);
 
@@ -1361,7 +1362,7 @@ extern void afs_zap_permits(struct rcu_head *);
 extern struct key *afs_request_key(struct afs_cell *);
 extern struct key *afs_request_key_rcu(struct afs_cell *);
 extern int afs_check_permit(struct afs_vnode *, struct key *, afs_access_t *);
-extern int afs_permission(struct inode *, int);
+extern int afs_permission(struct user_namespace *, struct inode *, int);
 extern void __exit afs_clean_up_permit_cache(void);
 
 /*
diff --git a/fs/afs/security.c b/fs/afs/security.c
index 9cf3102f370c..3c7a8fc4f93f 100644
--- a/fs/afs/security.c
+++ b/fs/afs/security.c
@@ -396,7 +396,8 @@ int afs_check_permit(struct afs_vnode *vnode, struct key *key,
  * - AFS ACLs are attached to directories only, and a file is controlled by its
  *   parent directory's ACL
  */
-int afs_permission(struct inode *inode, int mask)
+int afs_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		   int mask)
 {
 	struct afs_vnode *vnode = AFS_FS_I(inode);
 	afs_access_t access;
diff --git a/fs/afs/xattr.c b/fs/afs/xattr.c
index 95c573dcda11..c629caae5002 100644
--- a/fs/afs/xattr.c
+++ b/fs/afs/xattr.c
@@ -120,6 +120,7 @@ static const struct afs_operation_ops afs_store_acl_operation = {
  * Set a file's AFS3 ACL.
  */
 static int afs_xattr_set_acl(const struct xattr_handler *handler,
+			     struct user_namespace *mnt_userns,
                              struct dentry *dentry,
                              struct inode *inode, const char *name,
                              const void *buffer, size_t size, int flags)
@@ -248,6 +249,7 @@ static const struct afs_operation_ops yfs_store_opaque_acl2_operation = {
  * Set a file's YFS ACL.
  */
 static int afs_xattr_set_yfs(const struct xattr_handler *handler,
+			     struct user_namespace *mnt_userns,
                              struct dentry *dentry,
                              struct inode *inode, const char *name,
                              const void *buffer, size_t size, int flags)
diff --git a/fs/attr.c b/fs/attr.c
index b4bbdbd4c8ca..87ef39db1c34 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -18,27 +18,55 @@
 #include <linux/evm.h>
 #include <linux/ima.h>
 
-static bool chown_ok(const struct inode *inode, kuid_t uid)
+/**
+ * chown_ok - verify permissions to chown inode
+ * @mnt_userns:	user namespace of the mount @inode was found from
+ * @inode:	inode to check permissions on
+ * @uid:	uid to chown @inode to
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then
+ * take care to map the inode according to @mnt_userns before checking
+ * permissions. On non-idmapped mounts or if permission checking is to be
+ * performed on the raw inode simply passs init_user_ns.
+ */
+static bool chown_ok(struct user_namespace *mnt_userns,
+		     const struct inode *inode,
+		     kuid_t uid)
 {
-	if (uid_eq(current_fsuid(), inode->i_uid) &&
-	    uid_eq(uid, inode->i_uid))
+	kuid_t kuid = i_uid_into_mnt(mnt_userns, inode);
+	if (uid_eq(current_fsuid(), kuid) && uid_eq(uid, kuid))
 		return true;
-	if (capable_wrt_inode_uidgid(inode, CAP_CHOWN))
+	if (capable_wrt_inode_uidgid(mnt_userns, inode, CAP_CHOWN))
 		return true;
-	if (uid_eq(inode->i_uid, INVALID_UID) &&
+	if (uid_eq(kuid, INVALID_UID) &&
 	    ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
 		return true;
 	return false;
 }
 
-static bool chgrp_ok(const struct inode *inode, kgid_t gid)
+/**
+ * chgrp_ok - verify permissions to chgrp inode
+ * @mnt_userns:	user namespace of the mount @inode was found from
+ * @inode:	inode to check permissions on
+ * @gid:	gid to chown @inode to
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then
+ * take care to map the inode according to @mnt_userns before checking
+ * permissions. On non-idmapped mounts or if permission checking is to be
+ * performed on the raw inode simply passs init_user_ns.
+ */
+static bool chgrp_ok(struct user_namespace *mnt_userns,
+		     const struct inode *inode, kgid_t gid)
 {
-	if (uid_eq(current_fsuid(), inode->i_uid) &&
-	    (in_group_p(gid) || gid_eq(gid, inode->i_gid)))
+	kgid_t kgid = i_gid_into_mnt(mnt_userns, inode);
+	if (uid_eq(current_fsuid(), i_uid_into_mnt(mnt_userns, inode)) &&
+	    (in_group_p(gid) || gid_eq(gid, kgid)))
 		return true;
-	if (capable_wrt_inode_uidgid(inode, CAP_CHOWN))
+	if (capable_wrt_inode_uidgid(mnt_userns, inode, CAP_CHOWN))
 		return true;
-	if (gid_eq(inode->i_gid, INVALID_GID) &&
+	if (gid_eq(kgid, INVALID_GID) &&
 	    ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
 		return true;
 	return false;
@@ -46,6 +74,7 @@ static bool chgrp_ok(const struct inode *inode, kgid_t gid)
 
 /**
  * setattr_prepare - check if attribute changes to a dentry are allowed
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @dentry:	dentry to check
  * @attr:	attributes to change
  *
@@ -55,10 +84,17 @@ static bool chgrp_ok(const struct inode *inode, kgid_t gid)
  * SGID bit from mode if user is not allowed to set it. Also file capabilities
  * and IMA extended attributes are cleared if ATTR_KILL_PRIV is set.
  *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then
+ * take care to map the inode according to @mnt_userns before checking
+ * permissions. On non-idmapped mounts or if permission checking is to be
+ * performed on the raw inode simply passs init_user_ns.
+ *
  * Should be called as the first thing in ->setattr implementations,
  * possibly after taking additional locks.
  */
-int setattr_prepare(struct dentry *dentry, struct iattr *attr)
+int setattr_prepare(struct user_namespace *mnt_userns, struct dentry *dentry,
+		    struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	unsigned int ia_valid = attr->ia_valid;
@@ -78,27 +114,27 @@ int setattr_prepare(struct dentry *dentry, struct iattr *attr)
 		goto kill_priv;
 
 	/* Make sure a caller can chown. */
-	if ((ia_valid & ATTR_UID) && !chown_ok(inode, attr->ia_uid))
+	if ((ia_valid & ATTR_UID) && !chown_ok(mnt_userns, inode, attr->ia_uid))
 		return -EPERM;
 
 	/* Make sure caller can chgrp. */
-	if ((ia_valid & ATTR_GID) && !chgrp_ok(inode, attr->ia_gid))
+	if ((ia_valid & ATTR_GID) && !chgrp_ok(mnt_userns, inode, attr->ia_gid))
 		return -EPERM;
 
 	/* Make sure a caller can chmod. */
 	if (ia_valid & ATTR_MODE) {
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(mnt_userns, inode))
 			return -EPERM;
 		/* Also check the setgid bit! */
-		if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
-				inode->i_gid) &&
-		    !capable_wrt_inode_uidgid(inode, CAP_FSETID))
+               if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
+                                i_gid_into_mnt(mnt_userns, inode)) &&
+                    !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID))
 			attr->ia_mode &= ~S_ISGID;
 	}
 
 	/* Check for setting the inode time. */
 	if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) {
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(mnt_userns, inode))
 			return -EPERM;
 	}
 
@@ -107,7 +143,7 @@ kill_priv:
 	if (ia_valid & ATTR_KILL_PRIV) {
 		int error;
 
-		error = security_inode_killpriv(dentry);
+		error = security_inode_killpriv(mnt_userns, dentry);
 		if (error)
 			return error;
 	}
@@ -162,20 +198,33 @@ EXPORT_SYMBOL(inode_newsize_ok);
 
 /**
  * setattr_copy - copy simple metadata updates into the generic inode
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @inode:	the inode to be updated
  * @attr:	the new attributes
  *
  * setattr_copy must be called with i_mutex held.
  *
  * setattr_copy updates the inode's metadata with that specified
- * in attr. Noticeably missing is inode size update, which is more complex
+ * in attr on idmapped mounts. If file ownership is changed setattr_copy
+ * doesn't map ia_uid and ia_gid. It will asssume the caller has already
+ * provided the intended values. Necessary permission checks to determine
+ * whether or not the S_ISGID property needs to be removed are performed with
+ * the correct idmapped mount permission helpers.
+ * Noticeably missing is inode size update, which is more complex
  * as it requires pagecache updates.
  *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then
+ * take care to map the inode according to @mnt_userns before checking
+ * permissions. On non-idmapped mounts or if permission checking is to be
+ * performed on the raw inode simply passs init_user_ns.
+ *
  * The inode is not marked as dirty after this operation. The rationale is
  * that for "simple" filesystems, the struct inode is the inode storage.
  * The caller is free to mark the inode dirty afterwards if needed.
  */
-void setattr_copy(struct inode *inode, const struct iattr *attr)
+void setattr_copy(struct user_namespace *mnt_userns, struct inode *inode,
+		  const struct iattr *attr)
 {
 	unsigned int ia_valid = attr->ia_valid;
 
@@ -191,9 +240,9 @@ void setattr_copy(struct inode *inode, const struct iattr *attr)
 		inode->i_ctime = attr->ia_ctime;
 	if (ia_valid & ATTR_MODE) {
 		umode_t mode = attr->ia_mode;
-
-		if (!in_group_p(inode->i_gid) &&
-		    !capable_wrt_inode_uidgid(inode, CAP_FSETID))
+		kgid_t kgid = i_gid_into_mnt(mnt_userns, inode);
+		if (!in_group_p(kgid) &&
+		    !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID))
 			mode &= ~S_ISGID;
 		inode->i_mode = mode;
 	}
@@ -202,6 +251,7 @@ EXPORT_SYMBOL(setattr_copy);
 
 /**
  * notify_change - modify attributes of a filesytem object
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @dentry:	object affected
  * @attr:	new attributes
  * @delegated_inode: returns inode, if the inode is delegated
@@ -214,13 +264,23 @@ EXPORT_SYMBOL(setattr_copy);
  * retry.  Because breaking a delegation may take a long time, the
  * caller should drop the i_mutex before doing so.
  *
+ * If file ownership is changed notify_change() doesn't map ia_uid and
+ * ia_gid. It will asssume the caller has already provided the intended values.
+ *
  * Alternatively, a caller may pass NULL for delegated_inode.  This may
  * be appropriate for callers that expect the underlying filesystem not
  * to be NFS exported.  Also, passing NULL is fine for callers holding
  * the file open for write, as there can be no conflicting delegation in
  * that case.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then
+ * take care to map the inode according to @mnt_userns before checking
+ * permissions. On non-idmapped mounts or if permission checking is to be
+ * performed on the raw inode simply passs init_user_ns.
  */
-int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)
+int notify_change(struct user_namespace *mnt_userns, struct dentry *dentry,
+		  struct iattr *attr, struct inode **delegated_inode)
 {
 	struct inode *inode = dentry->d_inode;
 	umode_t mode = inode->i_mode;
@@ -243,8 +303,8 @@ int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **de
 		if (IS_IMMUTABLE(inode))
 			return -EPERM;
 
-		if (!inode_owner_or_capable(inode)) {
-			error = inode_permission(inode, MAY_WRITE);
+		if (!inode_owner_or_capable(mnt_userns, inode)) {
+			error = inode_permission(mnt_userns, inode, MAY_WRITE);
 			if (error)
 				return error;
 		}
@@ -320,9 +380,11 @@ int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **de
 	/* Don't allow modifications of files with invalid uids or
 	 * gids unless those uids & gids are being made valid.
 	 */
-	if (!(ia_valid & ATTR_UID) && !uid_valid(inode->i_uid))
+	if (!(ia_valid & ATTR_UID) &&
+	    !uid_valid(i_uid_into_mnt(mnt_userns, inode)))
 		return -EOVERFLOW;
-	if (!(ia_valid & ATTR_GID) && !gid_valid(inode->i_gid))
+	if (!(ia_valid & ATTR_GID) &&
+	    !gid_valid(i_gid_into_mnt(mnt_userns, inode)))
 		return -EOVERFLOW;
 
 	error = security_inode_setattr(dentry, attr);
@@ -333,13 +395,13 @@ int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **de
 		return error;
 
 	if (inode->i_op->setattr)
-		error = inode->i_op->setattr(dentry, attr);
+		error = inode->i_op->setattr(mnt_userns, dentry, attr);
 	else
-		error = simple_setattr(dentry, attr);
+		error = simple_setattr(mnt_userns, dentry, attr);
 
 	if (!error) {
 		fsnotify_change(dentry, ia_valid);
-		ima_inode_post_setattr(dentry);
+		ima_inode_post_setattr(mnt_userns, dentry);
 		evm_inode_post_setattr(dentry, ia_valid);
 	}
 
diff --git a/fs/autofs/root.c b/fs/autofs/root.c
index 5aaa1732bf1e..91fe4548c256 100644
--- a/fs/autofs/root.c
+++ b/fs/autofs/root.c
@@ -10,10 +10,12 @@
 
 #include "autofs_i.h"
 
-static int autofs_dir_symlink(struct inode *, struct dentry *, const char *);
+static int autofs_dir_symlink(struct user_namespace *, struct inode *,
+			      struct dentry *, const char *);
 static int autofs_dir_unlink(struct inode *, struct dentry *);
 static int autofs_dir_rmdir(struct inode *, struct dentry *);
-static int autofs_dir_mkdir(struct inode *, struct dentry *, umode_t);
+static int autofs_dir_mkdir(struct user_namespace *, struct inode *,
+			    struct dentry *, umode_t);
 static long autofs_root_ioctl(struct file *, unsigned int, unsigned long);
 #ifdef CONFIG_COMPAT
 static long autofs_root_compat_ioctl(struct file *,
@@ -524,9 +526,9 @@ static struct dentry *autofs_lookup(struct inode *dir,
 	return NULL;
 }
 
-static int autofs_dir_symlink(struct inode *dir,
-			       struct dentry *dentry,
-			       const char *symname)
+static int autofs_dir_symlink(struct user_namespace *mnt_userns,
+			      struct inode *dir, struct dentry *dentry,
+			      const char *symname)
 {
 	struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
 	struct autofs_info *ino = autofs_dentry_ino(dentry);
@@ -715,8 +717,9 @@ static int autofs_dir_rmdir(struct inode *dir, struct dentry *dentry)
 	return 0;
 }
 
-static int autofs_dir_mkdir(struct inode *dir,
-			    struct dentry *dentry, umode_t mode)
+static int autofs_dir_mkdir(struct user_namespace *mnt_userns,
+			    struct inode *dir, struct dentry *dentry,
+			    umode_t mode)
 {
 	struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
 	struct autofs_info *ino = autofs_dentry_ino(dentry);
diff --git a/fs/bad_inode.c b/fs/bad_inode.c
index 54f0ce444272..48e16144c1f7 100644
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -27,8 +27,9 @@ static const struct file_operations bad_file_ops =
 	.open		= bad_file_open,
 };
 
-static int bad_inode_create (struct inode *dir, struct dentry *dentry,
-		umode_t mode, bool excl)
+static int bad_inode_create(struct user_namespace *mnt_userns,
+			    struct inode *dir, struct dentry *dentry,
+			    umode_t mode, bool excl)
 {
 	return -EIO;
 }
@@ -50,14 +51,15 @@ static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
 	return -EIO;
 }
 
-static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
-		const char *symname)
+static int bad_inode_symlink(struct user_namespace *mnt_userns,
+			     struct inode *dir, struct dentry *dentry,
+			     const char *symname)
 {
 	return -EIO;
 }
 
-static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
-			umode_t mode)
+static int bad_inode_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+			   struct dentry *dentry, umode_t mode)
 {
 	return -EIO;
 }
@@ -67,13 +69,14 @@ static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
 	return -EIO;
 }
 
-static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
-			umode_t mode, dev_t rdev)
+static int bad_inode_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+			   struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	return -EIO;
 }
 
-static int bad_inode_rename2(struct inode *old_dir, struct dentry *old_dentry,
+static int bad_inode_rename2(struct user_namespace *mnt_userns,
+			     struct inode *old_dir, struct dentry *old_dentry,
 			     struct inode *new_dir, struct dentry *new_dentry,
 			     unsigned int flags)
 {
@@ -86,18 +89,21 @@ static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
 	return -EIO;
 }
 
-static int bad_inode_permission(struct inode *inode, int mask)
+static int bad_inode_permission(struct user_namespace *mnt_userns,
+				struct inode *inode, int mask)
 {
 	return -EIO;
 }
 
-static int bad_inode_getattr(const struct path *path, struct kstat *stat,
+static int bad_inode_getattr(struct user_namespace *mnt_userns,
+			     const struct path *path, struct kstat *stat,
 			     u32 request_mask, unsigned int query_flags)
 {
 	return -EIO;
 }
 
-static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
+static int bad_inode_setattr(struct user_namespace *mnt_userns,
+			     struct dentry *direntry, struct iattr *attrs)
 {
 	return -EIO;
 }
@@ -140,13 +146,15 @@ static int bad_inode_atomic_open(struct inode *inode, struct dentry *dentry,
 	return -EIO;
 }
 
-static int bad_inode_tmpfile(struct inode *inode, struct dentry *dentry,
+static int bad_inode_tmpfile(struct user_namespace *mnt_userns,
+			     struct inode *inode, struct dentry *dentry,
 			     umode_t mode)
 {
 	return -EIO;
 }
 
-static int bad_inode_set_acl(struct inode *inode, struct posix_acl *acl,
+static int bad_inode_set_acl(struct user_namespace *mnt_userns,
+			     struct inode *inode, struct posix_acl *acl,
 			     int type)
 {
 	return -EIO;
diff --git a/fs/bfs/dir.c b/fs/bfs/dir.c
index d8dfe3a0cb39..34d4f68f786b 100644
--- a/fs/bfs/dir.c
+++ b/fs/bfs/dir.c
@@ -75,8 +75,8 @@ const struct file_operations bfs_dir_operations = {
 	.llseek		= generic_file_llseek,
 };
 
-static int bfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-						bool excl)
+static int bfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, bool excl)
 {
 	int err;
 	struct inode *inode;
@@ -96,7 +96,7 @@ static int bfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 	}
 	set_bit(ino, info->si_imap);
 	info->si_freei--;
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 	inode->i_blocks = 0;
 	inode->i_op = &bfs_file_inops;
@@ -199,9 +199,9 @@ out_brelse:
 	return error;
 }
 
-static int bfs_rename(struct inode *old_dir, struct dentry *old_dentry,
-		      struct inode *new_dir, struct dentry *new_dentry,
-		      unsigned int flags)
+static int bfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		      struct dentry *old_dentry, struct inode *new_dir,
+		      struct dentry *new_dentry, unsigned int flags)
 {
 	struct inode *old_inode, *new_inode;
 	struct buffer_head *old_bh, *new_bh;
diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index a0af1b952c4d..d95eb5c8cb37 100644
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -107,13 +107,15 @@ out:
 	return ret;
 }
 
-int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		  struct posix_acl *acl, int type)
 {
 	int ret;
 	umode_t old_mode = inode->i_mode;
 
 	if (type == ACL_TYPE_ACCESS && acl) {
-		ret = posix_acl_update_mode(inode, &inode->i_mode, &acl);
+		ret = posix_acl_update_mode(&init_user_ns, inode,
+					    &inode->i_mode, &acl);
 		if (ret)
 			return ret;
 	}
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 3bc00aed13b2..bd659354d043 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3635,7 +3635,8 @@ static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
 /* acl.c */
 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
 struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
-int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		  struct posix_acl *acl, int type);
 int btrfs_init_acl(struct btrfs_trans_handle *trans,
 		   struct inode *inode, struct inode *dir);
 #else
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 535abf898225..2e1c282c202d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5212,7 +5212,8 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr)
 	return ret;
 }
 
-static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
+static int btrfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+			 struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -5221,7 +5222,7 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
 	if (btrfs_root_readonly(root))
 		return -EROFS;
 
-	err = setattr_prepare(dentry, attr);
+	err = setattr_prepare(&init_user_ns, dentry, attr);
 	if (err)
 		return err;
 
@@ -5232,12 +5233,13 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
 	}
 
 	if (attr->ia_valid) {
-		setattr_copy(inode, attr);
+		setattr_copy(&init_user_ns, inode, attr);
 		inode_inc_iversion(inode);
 		err = btrfs_dirty_inode(inode);
 
 		if (!err && attr->ia_valid & ATTR_MODE)
-			err = posix_acl_chmod(inode, inode->i_mode);
+			err = posix_acl_chmod(&init_user_ns, inode,
+					      inode->i_mode);
 	}
 
 	return err;
@@ -6357,7 +6359,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
 	if (ret != 0)
 		goto fail_unlock;
 
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 	inode_set_bytes(inode, 0);
 
 	inode->i_mtime = current_time(inode);
@@ -6518,8 +6520,8 @@ static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
 	return err;
 }
 
-static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
-			umode_t mode, dev_t rdev)
+static int btrfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
 	struct btrfs_trans_handle *trans;
@@ -6582,8 +6584,8 @@ out_unlock:
 	return err;
 }
 
-static int btrfs_create(struct inode *dir, struct dentry *dentry,
-			umode_t mode, bool excl)
+static int btrfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
 	struct btrfs_trans_handle *trans;
@@ -6727,7 +6729,8 @@ fail:
 	return err;
 }
 
-static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int btrfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
 	struct inode *inode = NULL;
@@ -9017,7 +9020,8 @@ fail:
 	return -ENOMEM;
 }
 
-static int btrfs_getattr(const struct path *path, struct kstat *stat,
+static int btrfs_getattr(struct user_namespace *mnt_userns,
+			 const struct path *path, struct kstat *stat,
 			 u32 request_mask, unsigned int flags)
 {
 	u64 delalloc_bytes;
@@ -9043,7 +9047,7 @@ static int btrfs_getattr(const struct path *path, struct kstat *stat,
 				  STATX_ATTR_IMMUTABLE |
 				  STATX_ATTR_NODUMP);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	stat->dev = BTRFS_I(inode)->root->anon_dev;
 
 	spin_lock(&BTRFS_I(inode)->lock);
@@ -9534,9 +9538,9 @@ out_notrans:
 	return ret;
 }
 
-static int btrfs_rename2(struct inode *old_dir, struct dentry *old_dentry,
-			 struct inode *new_dir, struct dentry *new_dentry,
-			 unsigned int flags)
+static int btrfs_rename2(struct user_namespace *mnt_userns, struct inode *old_dir,
+			 struct dentry *old_dentry, struct inode *new_dir,
+			 struct dentry *new_dentry, unsigned int flags)
 {
 	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 		return -EINVAL;
@@ -9744,8 +9748,8 @@ out:
 	return ret;
 }
 
-static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
-			 const char *symname)
+static int btrfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			 struct dentry *dentry, const char *symname)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
 	struct btrfs_trans_handle *trans;
@@ -10079,7 +10083,8 @@ static int btrfs_set_page_dirty(struct page *page)
 	return __set_page_dirty_nobuffers(page);
 }
 
-static int btrfs_permission(struct inode *inode, int mask)
+static int btrfs_permission(struct user_namespace *mnt_userns,
+			    struct inode *inode, int mask)
 {
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 	umode_t mode = inode->i_mode;
@@ -10091,10 +10096,11 @@ static int btrfs_permission(struct inode *inode, int mask)
 		if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY)
 			return -EACCES;
 	}
-	return generic_permission(inode, mask);
+	return generic_permission(&init_user_ns, inode, mask);
 }
 
-static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int btrfs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+			 struct dentry *dentry, umode_t mode)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
 	struct btrfs_trans_handle *trans;
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a8c60d46d19c..072e77726e94 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -213,7 +213,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 	const char *comp = NULL;
 	u32 binode_flags;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EPERM;
 
 	if (btrfs_root_readonly(root))
@@ -429,7 +429,7 @@ static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
 	unsigned old_i_flags;
 	int ret = 0;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EPERM;
 
 	if (btrfs_root_readonly(root))
@@ -925,13 +925,14 @@ static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
 	BUG_ON(d_inode(victim->d_parent) != dir);
 	audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
 
-	error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
+	error = inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
 	if (error)
 		return error;
 	if (IS_APPEND(dir))
 		return -EPERM;
-	if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
-	    IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
+	if (check_sticky(&init_user_ns, dir, d_inode(victim)) ||
+	    IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) ||
+	    IS_SWAPFILE(d_inode(victim)))
 		return -EPERM;
 	if (isdir) {
 		if (!d_is_dir(victim))
@@ -954,7 +955,7 @@ static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
 		return -EEXIST;
 	if (IS_DEADDIR(dir))
 		return -ENOENT;
-	return inode_permission(dir, MAY_WRITE | MAY_EXEC);
+	return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
 }
 
 /*
@@ -1871,7 +1872,7 @@ static noinline int __btrfs_ioctl_snap_create(struct file *file,
 			btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
 				   "Snapshot src from another FS");
 			ret = -EXDEV;
-		} else if (!inode_owner_or_capable(src_inode)) {
+		} else if (!inode_owner_or_capable(&init_user_ns, src_inode)) {
 			/*
 			 * Subvolume creation is not restricted, but snapshots
 			 * are limited to own subvolumes only
@@ -1991,7 +1992,7 @@ static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
 	u64 flags;
 	int ret = 0;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EPERM;
 
 	ret = mnt_want_write_file(file);
@@ -2547,7 +2548,8 @@ static int btrfs_search_path_in_tree_user(struct inode *inode,
 				ret = PTR_ERR(temp_inode);
 				goto out_put;
 			}
-			ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC);
+			ret = inode_permission(&init_user_ns, temp_inode,
+					       MAY_READ | MAY_EXEC);
 			iput(temp_inode);
 			if (ret) {
 				ret = -EACCES;
@@ -3077,7 +3079,8 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
 		if (root == dest)
 			goto out_dput;
 
-		err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
+		err = inode_permission(&init_user_ns, inode,
+				       MAY_WRITE | MAY_EXEC);
 		if (err)
 			goto out_dput;
 	}
@@ -3148,7 +3151,7 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
 		 * running and allows defrag on files open in read-only mode.
 		 */
 		if (!capable(CAP_SYS_ADMIN) &&
-		    inode_permission(inode, MAY_WRITE)) {
+		    inode_permission(&init_user_ns, inode, MAY_WRITE)) {
 			ret = -EPERM;
 			goto out;
 		}
@@ -4460,7 +4463,7 @@ static long _btrfs_ioctl_set_received_subvol(struct file *file,
 	int ret = 0;
 	int received_uuid_changed;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EPERM;
 
 	ret = mnt_want_write_file(file);
diff --git a/fs/btrfs/tests/btrfs-tests.c b/fs/btrfs/tests/btrfs-tests.c
index 6bd97bd4cb37..3a4099a2bf05 100644
--- a/fs/btrfs/tests/btrfs-tests.c
+++ b/fs/btrfs/tests/btrfs-tests.c
@@ -62,7 +62,7 @@ struct inode *btrfs_new_test_inode(void)
 	BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
 	BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
 	BTRFS_I(inode)->location.offset = 0;
-	inode_init_owner(inode, NULL, S_IFREG);
+	inode_init_owner(&init_user_ns, inode, NULL, S_IFREG);
 
 	return inode;
 }
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index af6246f36a9e..b025102e435f 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -362,6 +362,7 @@ static int btrfs_xattr_handler_get(const struct xattr_handler *handler,
 }
 
 static int btrfs_xattr_handler_set(const struct xattr_handler *handler,
+				   struct user_namespace *mnt_userns,
 				   struct dentry *unused, struct inode *inode,
 				   const char *name, const void *buffer,
 				   size_t size, int flags)
@@ -371,6 +372,7 @@ static int btrfs_xattr_handler_set(const struct xattr_handler *handler,
 }
 
 static int btrfs_xattr_handler_set_prop(const struct xattr_handler *handler,
+					struct user_namespace *mnt_userns,
 					struct dentry *unused, struct inode *inode,
 					const char *name, const void *value,
 					size_t size, int flags)
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index 4cea5fbf695e..5efa6a3702c0 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -470,14 +470,14 @@ static int cachefiles_attr_changed(struct fscache_object *_object)
 		_debug("discard tail %llx", oi_size);
 		newattrs.ia_valid = ATTR_SIZE;
 		newattrs.ia_size = oi_size & PAGE_MASK;
-		ret = notify_change(object->backer, &newattrs, NULL);
+		ret = notify_change(&init_user_ns, object->backer, &newattrs, NULL);
 		if (ret < 0)
 			goto truncate_failed;
 	}
 
 	newattrs.ia_valid = ATTR_SIZE;
 	newattrs.ia_size = ni_size;
-	ret = notify_change(object->backer, &newattrs, NULL);
+	ret = notify_change(&init_user_ns, object->backer, &newattrs, NULL);
 
 truncate_failed:
 	inode_unlock(d_inode(object->backer));
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index ecc8ecbbfa5a..7bf0732ae25c 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -311,7 +311,8 @@ static int cachefiles_bury_object(struct cachefiles_cache *cache,
 			cachefiles_io_error(cache, "Unlink security error");
 		} else {
 			trace_cachefiles_unlink(object, rep, why);
-			ret = vfs_unlink(d_inode(dir), rep, NULL);
+			ret = vfs_unlink(&init_user_ns, d_inode(dir), rep,
+					 NULL);
 
 			if (preemptive)
 				cachefiles_mark_object_buried(cache, rep, why);
@@ -412,9 +413,16 @@ try_again:
 	if (ret < 0) {
 		cachefiles_io_error(cache, "Rename security error %d", ret);
 	} else {
+		struct renamedata rd = {
+			.old_mnt_userns	= &init_user_ns,
+			.old_dir	= d_inode(dir),
+			.old_dentry	= rep,
+			.new_mnt_userns	= &init_user_ns,
+			.new_dir	= d_inode(cache->graveyard),
+			.new_dentry	= grave,
+		};
 		trace_cachefiles_rename(object, rep, grave, why);
-		ret = vfs_rename(d_inode(dir), rep,
-				 d_inode(cache->graveyard), grave, NULL, 0);
+		ret = vfs_rename(&rd);
 		if (ret != 0 && ret != -ENOMEM)
 			cachefiles_io_error(cache,
 					    "Rename failed with error %d", ret);
@@ -561,7 +569,7 @@ lookup_again:
 			if (ret < 0)
 				goto create_error;
 			start = jiffies;
-			ret = vfs_mkdir(d_inode(dir), next, 0);
+			ret = vfs_mkdir(&init_user_ns, d_inode(dir), next, 0);
 			cachefiles_hist(cachefiles_mkdir_histogram, start);
 			if (!key)
 				trace_cachefiles_mkdir(object, next, ret);
@@ -597,7 +605,8 @@ lookup_again:
 			if (ret < 0)
 				goto create_error;
 			start = jiffies;
-			ret = vfs_create(d_inode(dir), next, S_IFREG, true);
+			ret = vfs_create(&init_user_ns, d_inode(dir), next,
+					 S_IFREG, true);
 			cachefiles_hist(cachefiles_create_histogram, start);
 			trace_cachefiles_create(object, next, ret);
 			if (ret < 0)
@@ -791,7 +800,7 @@ retry:
 		ret = security_path_mkdir(&path, subdir, 0700);
 		if (ret < 0)
 			goto mkdir_error;
-		ret = vfs_mkdir(d_inode(dir), subdir, 0700);
+		ret = vfs_mkdir(&init_user_ns, d_inode(dir), subdir, 0700);
 		if (ret < 0)
 			goto mkdir_error;
 
diff --git a/fs/cachefiles/xattr.c b/fs/cachefiles/xattr.c
index 72e42438f3d7..a591b5e09637 100644
--- a/fs/cachefiles/xattr.c
+++ b/fs/cachefiles/xattr.c
@@ -39,8 +39,8 @@ int cachefiles_check_object_type(struct cachefiles_object *object)
 	_enter("%p{%s}", object, type);
 
 	/* attempt to install a type label directly */
-	ret = vfs_setxattr(dentry, cachefiles_xattr_cache, type, 2,
-			   XATTR_CREATE);
+	ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache, type,
+			   2, XATTR_CREATE);
 	if (ret == 0) {
 		_debug("SET"); /* we succeeded */
 		goto error;
@@ -54,7 +54,8 @@ int cachefiles_check_object_type(struct cachefiles_object *object)
 	}
 
 	/* read the current type label */
-	ret = vfs_getxattr(dentry, cachefiles_xattr_cache, xtype, 3);
+	ret = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache, xtype,
+			   3);
 	if (ret < 0) {
 		if (ret == -ERANGE)
 			goto bad_type_length;
@@ -110,9 +111,8 @@ int cachefiles_set_object_xattr(struct cachefiles_object *object,
 	_debug("SET #%u", auxdata->len);
 
 	clear_bit(FSCACHE_COOKIE_AUX_UPDATED, &object->fscache.cookie->flags);
-	ret = vfs_setxattr(dentry, cachefiles_xattr_cache,
-			   &auxdata->type, auxdata->len,
-			   XATTR_CREATE);
+	ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
+			   &auxdata->type, auxdata->len, XATTR_CREATE);
 	if (ret < 0 && ret != -ENOMEM)
 		cachefiles_io_error_obj(
 			object,
@@ -140,9 +140,8 @@ int cachefiles_update_object_xattr(struct cachefiles_object *object,
 	_debug("SET #%u", auxdata->len);
 
 	clear_bit(FSCACHE_COOKIE_AUX_UPDATED, &object->fscache.cookie->flags);
-	ret = vfs_setxattr(dentry, cachefiles_xattr_cache,
-			   &auxdata->type, auxdata->len,
-			   XATTR_REPLACE);
+	ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
+			   &auxdata->type, auxdata->len, XATTR_REPLACE);
 	if (ret < 0 && ret != -ENOMEM)
 		cachefiles_io_error_obj(
 			object,
@@ -171,7 +170,7 @@ int cachefiles_check_auxdata(struct cachefiles_object *object)
 	if (!auxbuf)
 		return -ENOMEM;
 
-	xlen = vfs_getxattr(dentry, cachefiles_xattr_cache,
+	xlen = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
 			    &auxbuf->type, 512 + 1);
 	ret = -ESTALE;
 	if (xlen < 1 ||
@@ -213,7 +212,7 @@ int cachefiles_check_object_xattr(struct cachefiles_object *object,
 	}
 
 	/* read the current type label */
-	ret = vfs_getxattr(dentry, cachefiles_xattr_cache,
+	ret = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache,
 			   &auxbuf->type, 512 + 1);
 	if (ret < 0) {
 		if (ret == -ENODATA)
@@ -270,9 +269,9 @@ int cachefiles_check_object_xattr(struct cachefiles_object *object,
 		}
 
 		/* update the current label */
-		ret = vfs_setxattr(dentry, cachefiles_xattr_cache,
-				   &auxdata->type, auxdata->len,
-				   XATTR_REPLACE);
+		ret = vfs_setxattr(&init_user_ns, dentry,
+				   cachefiles_xattr_cache, &auxdata->type,
+				   auxdata->len, XATTR_REPLACE);
 		if (ret < 0) {
 			cachefiles_io_error_obj(object,
 						"Can't update xattr on %lu"
@@ -309,7 +308,7 @@ int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
 {
 	int ret;
 
-	ret = vfs_removexattr(dentry, cachefiles_xattr_cache);
+	ret = vfs_removexattr(&init_user_ns, dentry, cachefiles_xattr_cache);
 	if (ret < 0) {
 		if (ret == -ENOENT || ret == -ENODATA)
 			ret = 0;
diff --git a/fs/ceph/acl.c b/fs/ceph/acl.c
index e0465741c591..529af59d9fd3 100644
--- a/fs/ceph/acl.c
+++ b/fs/ceph/acl.c
@@ -82,7 +82,8 @@ retry:
 	return acl;
 }
 
-int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+int ceph_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		 struct posix_acl *acl, int type)
 {
 	int ret = 0, size = 0;
 	const char *name = NULL;
@@ -100,7 +101,8 @@ int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 	case ACL_TYPE_ACCESS:
 		name = XATTR_NAME_POSIX_ACL_ACCESS;
 		if (acl) {
-			ret = posix_acl_update_mode(inode, &new_mode, &acl);
+			ret = posix_acl_update_mode(&init_user_ns, inode,
+						    &new_mode, &acl);
 			if (ret)
 				goto out;
 		}
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 858ee7362ff5..83d9358854fb 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -823,8 +823,8 @@ int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
 	return PTR_ERR(result);
 }
 
-static int ceph_mknod(struct inode *dir, struct dentry *dentry,
-		      umode_t mode, dev_t rdev)
+static int ceph_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
 	struct ceph_mds_request *req;
@@ -878,14 +878,14 @@ out:
 	return err;
 }
 
-static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		       bool excl)
+static int ceph_create(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, bool excl)
 {
-	return ceph_mknod(dir, dentry, mode, 0);
+	return ceph_mknod(mnt_userns, dir, dentry, mode, 0);
 }
 
-static int ceph_symlink(struct inode *dir, struct dentry *dentry,
-			    const char *dest)
+static int ceph_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, const char *dest)
 {
 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
 	struct ceph_mds_request *req;
@@ -937,7 +937,8 @@ out:
 	return err;
 }
 
-static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int ceph_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode)
 {
 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
 	struct ceph_mds_request *req;
@@ -1183,9 +1184,9 @@ out:
 	return err;
 }
 
-static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
-		       struct inode *new_dir, struct dentry *new_dentry,
-		       unsigned int flags)
+static int ceph_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		       struct dentry *old_dentry, struct inode *new_dir,
+		       struct dentry *new_dentry, unsigned int flags)
 {
 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb);
 	struct ceph_mds_request *req;
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 5d20a620e96c..156f849f5385 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -2201,7 +2201,8 @@ int __ceph_setattr(struct inode *inode, struct iattr *attr)
 /*
  * setattr
  */
-int ceph_setattr(struct dentry *dentry, struct iattr *attr)
+int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		 struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
@@ -2210,7 +2211,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
 	if (ceph_snap(inode) != CEPH_NOSNAP)
 		return -EROFS;
 
-	err = setattr_prepare(dentry, attr);
+	err = setattr_prepare(&init_user_ns, dentry, attr);
 	if (err != 0)
 		return err;
 
@@ -2225,7 +2226,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
 	err = __ceph_setattr(inode, attr);
 
 	if (err >= 0 && (attr->ia_valid & ATTR_MODE))
-		err = posix_acl_chmod(inode, attr->ia_mode);
+		err = posix_acl_chmod(&init_user_ns, inode, attr->ia_mode);
 
 	return err;
 }
@@ -2284,7 +2285,8 @@ int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
  * Check inode permissions.  We verify we have a valid value for
  * the AUTH cap, then call the generic handler.
  */
-int ceph_permission(struct inode *inode, int mask)
+int ceph_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		    int mask)
 {
 	int err;
 
@@ -2294,7 +2296,7 @@ int ceph_permission(struct inode *inode, int mask)
 	err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
 
 	if (!err)
-		err = generic_permission(inode, mask);
+		err = generic_permission(&init_user_ns, inode, mask);
 	return err;
 }
 
@@ -2331,8 +2333,8 @@ static int statx_to_caps(u32 want, umode_t mode)
  * Get all the attributes. If we have sufficient caps for the requested attrs,
  * then we can avoid talking to the MDS at all.
  */
-int ceph_getattr(const struct path *path, struct kstat *stat,
-		 u32 request_mask, unsigned int flags)
+int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		 struct kstat *stat, u32 request_mask, unsigned int flags)
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct ceph_inode_info *ci = ceph_inode(inode);
@@ -2348,7 +2350,7 @@ int ceph_getattr(const struct path *path, struct kstat *stat,
 			return err;
 	}
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	stat->ino = ceph_present_inode(inode);
 
 	/*
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 13b02887b085..c48bb30c8d70 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1000,10 +1000,13 @@ static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
 {
 	return __ceph_do_getattr(inode, NULL, mask, force);
 }
-extern int ceph_permission(struct inode *inode, int mask);
+extern int ceph_permission(struct user_namespace *mnt_userns,
+			   struct inode *inode, int mask);
 extern int __ceph_setattr(struct inode *inode, struct iattr *attr);
-extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
-extern int ceph_getattr(const struct path *path, struct kstat *stat,
+extern int ceph_setattr(struct user_namespace *mnt_userns,
+			struct dentry *dentry, struct iattr *attr);
+extern int ceph_getattr(struct user_namespace *mnt_userns,
+			const struct path *path, struct kstat *stat,
 			u32 request_mask, unsigned int flags);
 
 /* xattr.c */
@@ -1064,7 +1067,8 @@ void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx);
 #ifdef CONFIG_CEPH_FS_POSIX_ACL
 
 struct posix_acl *ceph_get_acl(struct inode *, int);
-int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+int ceph_set_acl(struct user_namespace *mnt_userns,
+		 struct inode *inode, struct posix_acl *acl, int type);
 int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
 		       struct ceph_acl_sec_ctx *as_ctx);
 void ceph_init_inode_acls(struct inode *inode,
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 24997982de01..02f59bcb4f27 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -1238,6 +1238,7 @@ static int ceph_get_xattr_handler(const struct xattr_handler *handler,
 }
 
 static int ceph_set_xattr_handler(const struct xattr_handler *handler,
+				  struct user_namespace *mnt_userns,
 				  struct dentry *unused, struct inode *inode,
 				  const char *name, const void *value,
 				  size_t size, int flags)
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index ab883e84e116..38534e066cc7 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -305,7 +305,8 @@ static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
 	return -EOPNOTSUPP;
 }
 
-static int cifs_permission(struct inode *inode, int mask)
+static int cifs_permission(struct user_namespace *mnt_userns,
+			   struct inode *inode, int mask)
 {
 	struct cifs_sb_info *cifs_sb;
 
@@ -320,7 +321,7 @@ static int cifs_permission(struct inode *inode, int mask)
 		on the client (above and beyond ACL on servers) for
 		servers which do not support setting and viewing mode bits,
 		so allowing client to check permissions is useful */
-		return generic_permission(inode, mask);
+		return generic_permission(&init_user_ns, inode, mask);
 }
 
 static struct kmem_cache *cifs_inode_cachep;
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 2307bb0f6147..71e9c6abb2a6 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -62,19 +62,22 @@ extern void cifs_sb_deactive(struct super_block *sb);
 /* Functions related to inodes */
 extern const struct inode_operations cifs_dir_inode_ops;
 extern struct inode *cifs_root_iget(struct super_block *);
-extern int cifs_create(struct inode *, struct dentry *, umode_t,
-		       bool excl);
+extern int cifs_create(struct user_namespace *, struct inode *,
+		       struct dentry *, umode_t, bool excl);
 extern int cifs_atomic_open(struct inode *, struct dentry *,
 			    struct file *, unsigned, umode_t);
 extern struct dentry *cifs_lookup(struct inode *, struct dentry *,
 				  unsigned int);
 extern int cifs_unlink(struct inode *dir, struct dentry *dentry);
 extern int cifs_hardlink(struct dentry *, struct inode *, struct dentry *);
-extern int cifs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
-extern int cifs_mkdir(struct inode *, struct dentry *, umode_t);
+extern int cifs_mknod(struct user_namespace *, struct inode *, struct dentry *,
+		      umode_t, dev_t);
+extern int cifs_mkdir(struct user_namespace *, struct inode *, struct dentry *,
+		      umode_t);
 extern int cifs_rmdir(struct inode *, struct dentry *);
-extern int cifs_rename2(struct inode *, struct dentry *, struct inode *,
-			struct dentry *, unsigned int);
+extern int cifs_rename2(struct user_namespace *, struct inode *,
+			struct dentry *, struct inode *, struct dentry *,
+			unsigned int);
 extern int cifs_revalidate_file_attr(struct file *filp);
 extern int cifs_revalidate_dentry_attr(struct dentry *);
 extern int cifs_revalidate_file(struct file *filp);
@@ -82,8 +85,10 @@ extern int cifs_revalidate_dentry(struct dentry *);
 extern int cifs_invalidate_mapping(struct inode *inode);
 extern int cifs_revalidate_mapping(struct inode *inode);
 extern int cifs_zap_mapping(struct inode *inode);
-extern int cifs_getattr(const struct path *, struct kstat *, u32, unsigned int);
-extern int cifs_setattr(struct dentry *, struct iattr *);
+extern int cifs_getattr(struct user_namespace *, const struct path *,
+			struct kstat *, u32, unsigned int);
+extern int cifs_setattr(struct user_namespace *, struct dentry *,
+			struct iattr *);
 extern int cifs_fiemap(struct inode *, struct fiemap_extent_info *, u64 start,
 		       u64 len);
 
@@ -132,8 +137,8 @@ extern struct vfsmount *cifs_dfs_d_automount(struct path *path);
 /* Functions related to symlinks */
 extern const char *cifs_get_link(struct dentry *, struct inode *,
 			struct delayed_call *);
-extern int cifs_symlink(struct inode *inode, struct dentry *direntry,
-			const char *symname);
+extern int cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
+			struct dentry *direntry, const char *symname);
 
 #ifdef CONFIG_CIFS_XATTR
 extern const struct xattr_handler *cifs_xattr_handlers[];
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 97ac363b5df1..a3fb81e0ba17 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -567,8 +567,8 @@ out_free_xid:
 	return rc;
 }
 
-int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
-		bool excl)
+int cifs_create(struct user_namespace *mnt_userns, struct inode *inode,
+		struct dentry *direntry, umode_t mode, bool excl)
 {
 	int rc;
 	unsigned int xid = get_xid();
@@ -611,8 +611,8 @@ out_free_xid:
 	return rc;
 }
 
-int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
-		dev_t device_number)
+int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
+	       struct dentry *direntry, umode_t mode, dev_t device_number)
 {
 	int rc = -EPERM;
 	unsigned int xid;
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index a83b3a8ffaac..3e9c7bb23f26 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1857,7 +1857,8 @@ posix_mkdir_get_info:
 	goto posix_mkdir_out;
 }
 
-int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
+int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
+	       struct dentry *direntry, umode_t mode)
 {
 	int rc = 0;
 	unsigned int xid;
@@ -2067,9 +2068,9 @@ do_rename_exit:
 }
 
 int
-cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
-	     struct inode *target_dir, struct dentry *target_dentry,
-	     unsigned int flags)
+cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
+	     struct dentry *source_dentry, struct inode *target_dir,
+	     struct dentry *target_dentry, unsigned int flags)
 {
 	char *from_name = NULL;
 	char *to_name = NULL;
@@ -2370,8 +2371,8 @@ int cifs_revalidate_dentry(struct dentry *dentry)
 	return cifs_revalidate_mapping(inode);
 }
 
-int cifs_getattr(const struct path *path, struct kstat *stat,
-		 u32 request_mask, unsigned int flags)
+int cifs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		 struct kstat *stat, u32 request_mask, unsigned int flags)
 {
 	struct dentry *dentry = path->dentry;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
@@ -2408,7 +2409,7 @@ int cifs_getattr(const struct path *path, struct kstat *stat,
 			return rc;
 	}
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	stat->blksize = cifs_sb->ctx->bsize;
 	stat->ino = CIFS_I(inode)->uniqueid;
 
@@ -2610,7 +2611,7 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 		attrs->ia_valid |= ATTR_FORCE;
 
-	rc = setattr_prepare(direntry, attrs);
+	rc = setattr_prepare(&init_user_ns, direntry, attrs);
 	if (rc < 0)
 		goto out;
 
@@ -2715,7 +2716,7 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
 	    attrs->ia_size != i_size_read(inode))
 		truncate_setsize(inode, attrs->ia_size);
 
-	setattr_copy(inode, attrs);
+	setattr_copy(&init_user_ns, inode, attrs);
 	mark_inode_dirty(inode);
 
 	/* force revalidate when any of these times are set since some
@@ -2757,7 +2758,7 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 		attrs->ia_valid |= ATTR_FORCE;
 
-	rc = setattr_prepare(direntry, attrs);
+	rc = setattr_prepare(&init_user_ns, direntry, attrs);
 	if (rc < 0) {
 		free_xid(xid);
 		return rc;
@@ -2913,7 +2914,7 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
 	    attrs->ia_size != i_size_read(inode))
 		truncate_setsize(inode, attrs->ia_size);
 
-	setattr_copy(inode, attrs);
+	setattr_copy(&init_user_ns, inode, attrs);
 	mark_inode_dirty(inode);
 
 cifs_setattr_exit:
@@ -2923,7 +2924,8 @@ cifs_setattr_exit:
 }
 
 int
-cifs_setattr(struct dentry *direntry, struct iattr *attrs)
+cifs_setattr(struct user_namespace *mnt_userns, struct dentry *direntry,
+	     struct iattr *attrs)
 {
 	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
 	struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 94dab4309fbb..7c5878a645d9 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -661,7 +661,8 @@ cifs_get_link(struct dentry *direntry, struct inode *inode,
 }
 
 int
-cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
+cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
+	     struct dentry *direntry, const char *symname)
 {
 	int rc = -EOPNOTSUPP;
 	unsigned int xid;
diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
index 6b658a1172ef..41a611e76bb7 100644
--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -101,6 +101,7 @@ static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
 }
 
 static int cifs_xattr_set(const struct xattr_handler *handler,
+			  struct user_namespace *mnt_userns,
 			  struct dentry *dentry, struct inode *inode,
 			  const char *name, const void *value,
 			  size_t size, int flags)
diff --git a/fs/coda/coda_linux.h b/fs/coda/coda_linux.h
index d5ebd36fb2cc..e7b27754ce78 100644
--- a/fs/coda/coda_linux.h
+++ b/fs/coda/coda_linux.h
@@ -46,10 +46,12 @@ extern const struct file_operations coda_ioctl_operations;
 /* operations shared over more than one file */
 int coda_open(struct inode *i, struct file *f);
 int coda_release(struct inode *i, struct file *f);
-int coda_permission(struct inode *inode, int mask);
+int coda_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		    int mask);
 int coda_revalidate_inode(struct inode *);
-int coda_getattr(const struct path *, struct kstat *, u32, unsigned int);
-int coda_setattr(struct dentry *, struct iattr *);
+int coda_getattr(struct user_namespace *, const struct path *, struct kstat *,
+		 u32, unsigned int);
+int coda_setattr(struct user_namespace *, struct dentry *, struct iattr *);
 
 /* this file:  heloers */
 char *coda_f2s(struct CodaFid *f);
diff --git a/fs/coda/dir.c b/fs/coda/dir.c
index ca40c2556ba6..d69989c1bac3 100644
--- a/fs/coda/dir.c
+++ b/fs/coda/dir.c
@@ -73,7 +73,8 @@ static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, unsig
 }
 
 
-int coda_permission(struct inode *inode, int mask)
+int coda_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		    int mask)
 {
 	int error;
 
@@ -132,7 +133,8 @@ static inline void coda_dir_drop_nlink(struct inode *dir)
 }
 
 /* creation routines: create, mknod, mkdir, link, symlink */
-static int coda_create(struct inode *dir, struct dentry *de, umode_t mode, bool excl)
+static int coda_create(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *de, umode_t mode, bool excl)
 {
 	int error;
 	const char *name=de->d_name.name;
@@ -164,7 +166,8 @@ err_out:
 	return error;
 }
 
-static int coda_mkdir(struct inode *dir, struct dentry *de, umode_t mode)
+static int coda_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *de, umode_t mode)
 {
 	struct inode *inode;
 	struct coda_vattr attrs;
@@ -225,7 +228,8 @@ static int coda_link(struct dentry *source_de, struct inode *dir_inode,
 }
 
 
-static int coda_symlink(struct inode *dir_inode, struct dentry *de,
+static int coda_symlink(struct user_namespace *mnt_userns,
+			struct inode *dir_inode, struct dentry *de,
 			const char *symname)
 {
 	const char *name = de->d_name.name;
@@ -291,9 +295,9 @@ static int coda_rmdir(struct inode *dir, struct dentry *de)
 }
 
 /* rename */
-static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
-		       struct inode *new_dir, struct dentry *new_dentry,
-		       unsigned int flags)
+static int coda_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		       struct dentry *old_dentry, struct inode *new_dir,
+		       struct dentry *new_dentry, unsigned int flags)
 {
 	const char *old_name = old_dentry->d_name.name;
 	const char *new_name = new_dentry->d_name.name;
diff --git a/fs/coda/inode.c b/fs/coda/inode.c
index b1c70e2b9b1e..d9f1bd7153df 100644
--- a/fs/coda/inode.c
+++ b/fs/coda/inode.c
@@ -251,16 +251,17 @@ static void coda_evict_inode(struct inode *inode)
 	coda_cache_clear_inode(inode);
 }
 
-int coda_getattr(const struct path *path, struct kstat *stat,
-		 u32 request_mask, unsigned int flags)
+int coda_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		 struct kstat *stat, u32 request_mask, unsigned int flags)
 {
 	int err = coda_revalidate_inode(d_inode(path->dentry));
 	if (!err)
-		generic_fillattr(d_inode(path->dentry), stat);
+		generic_fillattr(&init_user_ns, d_inode(path->dentry), stat);
 	return err;
 }
 
-int coda_setattr(struct dentry *de, struct iattr *iattr)
+int coda_setattr(struct user_namespace *mnt_userns, struct dentry *de,
+		 struct iattr *iattr)
 {
 	struct inode *inode = d_inode(de);
 	struct coda_vattr vattr;
diff --git a/fs/coda/pioctl.c b/fs/coda/pioctl.c
index 3aec27e5eb82..cb9fd59a688c 100644
--- a/fs/coda/pioctl.c
+++ b/fs/coda/pioctl.c
@@ -24,7 +24,8 @@
 #include "coda_linux.h"
 
 /* pioctl ops */
-static int coda_ioctl_permission(struct inode *inode, int mask);
+static int coda_ioctl_permission(struct user_namespace *mnt_userns,
+				 struct inode *inode, int mask);
 static long coda_pioctl(struct file *filp, unsigned int cmd,
 			unsigned long user_data);
 
@@ -40,7 +41,8 @@ const struct file_operations coda_ioctl_operations = {
 };
 
 /* the coda pioctl inode ops */
-static int coda_ioctl_permission(struct inode *inode, int mask)
+static int coda_ioctl_permission(struct user_namespace *mnt_userns,
+				 struct inode *inode, int mask)
 {
 	return (mask & MAY_EXEC) ? -EACCES : 0;
 }
diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h
index 22dce2d35a4b..9a3aed249692 100644
--- a/fs/configfs/configfs_internal.h
+++ b/fs/configfs/configfs_internal.h
@@ -79,7 +79,8 @@ extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
 
 extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
 extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
-extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
+extern int configfs_setattr(struct user_namespace *mnt_userns,
+			    struct dentry *dentry, struct iattr *iattr);
 
 extern struct dentry *configfs_pin_fs(void);
 extern void configfs_release_fs(void);
@@ -92,7 +93,8 @@ extern const struct inode_operations configfs_root_inode_operations;
 extern const struct inode_operations configfs_symlink_inode_operations;
 extern const struct dentry_operations configfs_dentry_ops;
 
-extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
+extern int configfs_symlink(struct user_namespace *mnt_userns,
+			    struct inode *dir, struct dentry *dentry,
 			    const char *symname);
 extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
 
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index b839dd1b459f..b6098e02e20b 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -1268,7 +1268,8 @@ out_root_unlock:
 }
 EXPORT_SYMBOL(configfs_depend_item_unlocked);
 
-static int configfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int configfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+			  struct dentry *dentry, umode_t mode)
 {
 	int ret = 0;
 	int module_got = 0;
diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index 8bd6a883c94c..42c348bb2903 100644
--- a/fs/configfs/inode.c
+++ b/fs/configfs/inode.c
@@ -40,7 +40,8 @@ static const struct inode_operations configfs_inode_operations ={
 	.setattr	= configfs_setattr,
 };
 
-int configfs_setattr(struct dentry * dentry, struct iattr * iattr)
+int configfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		     struct iattr *iattr)
 {
 	struct inode * inode = d_inode(dentry);
 	struct configfs_dirent * sd = dentry->d_fsdata;
@@ -67,7 +68,7 @@ int configfs_setattr(struct dentry * dentry, struct iattr * iattr)
 	}
 	/* attributes were changed atleast once in past */
 
-	error = simple_setattr(dentry, iattr);
+	error = simple_setattr(mnt_userns, dentry, iattr);
 	if (error)
 		return error;
 
diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
index cb61467478ca..77c854364e60 100644
--- a/fs/configfs/symlink.c
+++ b/fs/configfs/symlink.c
@@ -139,7 +139,8 @@ static int get_target(const char *symname, struct path *path,
 }
 
 
-int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
+int configfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, const char *symname)
 {
 	int ret;
 	struct path path;
@@ -197,7 +198,8 @@ int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symna
 	if (dentry->d_inode || d_unhashed(dentry))
 		ret = -EEXIST;
 	else
-		ret = inode_permission(dir, MAY_WRITE | MAY_EXEC);
+		ret = inode_permission(&init_user_ns, dir,
+				       MAY_WRITE | MAY_EXEC);
 	if (!ret)
 		ret = type->ct_item_ops->allow_link(parent_item, target_item);
 	if (!ret) {
diff --git a/fs/coredump.c b/fs/coredump.c
index a2f6ecc8e345..ae778937a1ff 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -703,6 +703,7 @@ void do_coredump(const kernel_siginfo_t *siginfo)
 			goto close_fail;
 		}
 	} else {
+		struct user_namespace *mnt_userns;
 		struct inode *inode;
 		int open_flags = O_CREAT | O_RDWR | O_NOFOLLOW |
 				 O_LARGEFILE | O_EXCL;
@@ -780,13 +781,15 @@ void do_coredump(const kernel_siginfo_t *siginfo)
 		 * a process dumps core while its cwd is e.g. on a vfat
 		 * filesystem.
 		 */
-		if (!uid_eq(inode->i_uid, current_fsuid()))
+		mnt_userns = file_mnt_user_ns(cprm.file);
+		if (!uid_eq(i_uid_into_mnt(mnt_userns, inode), current_fsuid()))
 			goto close_fail;
 		if ((inode->i_mode & 0677) != 0600)
 			goto close_fail;
 		if (!(cprm.file->f_mode & FMODE_CAN_WRITE))
 			goto close_fail;
-		if (do_truncate(cprm.file->f_path.dentry, 0, 0, cprm.file))
+		if (do_truncate(mnt_userns, cprm.file->f_path.dentry,
+				0, 0, cprm.file))
 			goto close_fail;
 	}
 
@@ -931,7 +934,8 @@ void dump_truncate(struct coredump_params *cprm)
 	if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
 		offset = file->f_op->llseek(file, 0, SEEK_CUR);
 		if (i_size_read(file->f_mapping->host) < offset)
-			do_truncate(file->f_path.dentry, offset, 0, file);
+			do_truncate(file_mnt_user_ns(file), file->f_path.dentry,
+				    offset, 0, file);
 	}
 }
 EXPORT_SYMBOL(dump_truncate);
diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c
index a51cef6bd27f..ed3d623724cd 100644
--- a/fs/crypto/policy.c
+++ b/fs/crypto/policy.c
@@ -465,7 +465,7 @@ int fscrypt_ioctl_set_policy(struct file *filp, const void __user *arg)
 		return -EFAULT;
 	policy.version = version;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EACCES;
 
 	ret = mnt_want_write_file(filp);
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 2fcf66473436..c35249497b9b 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -42,13 +42,14 @@ static unsigned int debugfs_allow = DEFAULT_DEBUGFS_ALLOW_BITS;
  * so that we can use the file mode as part of a heuristic to determine whether
  * to lock down individual files.
  */
-static int debugfs_setattr(struct dentry *dentry, struct iattr *ia)
+static int debugfs_setattr(struct user_namespace *mnt_userns,
+			   struct dentry *dentry, struct iattr *ia)
 {
 	int ret = security_locked_down(LOCKDOWN_DEBUGFS);
 
 	if (ret && (ia->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID)))
 		return ret;
-	return simple_setattr(dentry, ia);
+	return simple_setattr(&init_user_ns, dentry, ia);
 }
 
 static const struct inode_operations debugfs_file_inode_operations = {
@@ -775,8 +776,8 @@ struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
 
 	take_dentry_name_snapshot(&old_name, old_dentry);
 
-	error = simple_rename(d_inode(old_dir), old_dentry, d_inode(new_dir),
-			      dentry, 0);
+	error = simple_rename(&init_user_ns, d_inode(old_dir), old_dentry,
+			      d_inode(new_dir), dentry, 0);
 	if (error) {
 		release_dentry_name_snapshot(&old_name);
 		goto exit;
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 0681540c48d9..943e523f4c9d 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1110,8 +1110,8 @@ ecryptfs_write_metadata_to_xattr(struct dentry *ecryptfs_dentry,
 	}
 
 	inode_lock(lower_inode);
-	rc = __vfs_setxattr(lower_dentry, lower_inode, ECRYPTFS_XATTR_NAME,
-			    page_virt, size, 0);
+	rc = __vfs_setxattr(&init_user_ns, lower_dentry, lower_inode,
+			    ECRYPTFS_XATTR_NAME, page_virt, size, 0);
 	if (!rc && ecryptfs_inode)
 		fsstack_copy_attr_all(ecryptfs_inode, lower_inode);
 	inode_unlock(lower_inode);
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 58d0f7187997..18e9285fbb4c 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -141,7 +141,8 @@ static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
 	else if (d_unhashed(lower_dentry))
 		rc = -EINVAL;
 	else
-		rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL);
+		rc = vfs_unlink(&init_user_ns, lower_dir_inode, lower_dentry,
+				NULL);
 	if (rc) {
 		printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 		goto out_unlock;
@@ -180,7 +181,8 @@ ecryptfs_do_create(struct inode *directory_inode,
 
 	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 	lower_dir_dentry = lock_parent(lower_dentry);
-	rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true);
+	rc = vfs_create(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry,
+			mode, true);
 	if (rc) {
 		printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
 		       "rc = [%d]\n", __func__, rc);
@@ -190,7 +192,8 @@ ecryptfs_do_create(struct inode *directory_inode,
 	inode = __ecryptfs_get_inode(d_inode(lower_dentry),
 				     directory_inode->i_sb);
 	if (IS_ERR(inode)) {
-		vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL);
+		vfs_unlink(&init_user_ns, d_inode(lower_dir_dentry),
+			   lower_dentry, NULL);
 		goto out_lock;
 	}
 	fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry));
@@ -254,7 +257,8 @@ out:
  * Returns zero on success; non-zero on error condition
  */
 static int
-ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
+ecryptfs_create(struct user_namespace *mnt_userns,
+		struct inode *directory_inode, struct dentry *ecryptfs_dentry,
 		umode_t mode, bool excl)
 {
 	struct inode *ecryptfs_inode;
@@ -436,8 +440,8 @@ static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 	dget(lower_old_dentry);
 	dget(lower_new_dentry);
 	lower_dir_dentry = lock_parent(lower_new_dentry);
-	rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry),
-		      lower_new_dentry, NULL);
+	rc = vfs_link(lower_old_dentry, &init_user_ns,
+		      d_inode(lower_dir_dentry), lower_new_dentry, NULL);
 	if (rc || d_really_is_negative(lower_new_dentry))
 		goto out_lock;
 	rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
@@ -460,7 +464,8 @@ static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 	return ecryptfs_do_unlink(dir, dentry, d_inode(dentry));
 }
 
-static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
+static int ecryptfs_symlink(struct user_namespace *mnt_userns,
+			    struct inode *dir, struct dentry *dentry,
 			    const char *symname)
 {
 	int rc;
@@ -481,7 +486,7 @@ static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
 						  strlen(symname));
 	if (rc)
 		goto out_lock;
-	rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry,
+	rc = vfs_symlink(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry,
 			 encoded_symname);
 	kfree(encoded_symname);
 	if (rc || d_really_is_negative(lower_dentry))
@@ -499,7 +504,8 @@ out_lock:
 	return rc;
 }
 
-static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int ecryptfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+			  struct dentry *dentry, umode_t mode)
 {
 	int rc;
 	struct dentry *lower_dentry;
@@ -507,7 +513,8 @@ static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode
 
 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
 	lower_dir_dentry = lock_parent(lower_dentry);
-	rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode);
+	rc = vfs_mkdir(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry,
+		       mode);
 	if (rc || d_really_is_negative(lower_dentry))
 		goto out;
 	rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
@@ -541,7 +548,7 @@ static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 	else if (d_unhashed(lower_dentry))
 		rc = -EINVAL;
 	else
-		rc = vfs_rmdir(lower_dir_inode, lower_dentry);
+		rc = vfs_rmdir(&init_user_ns, lower_dir_inode, lower_dentry);
 	if (!rc) {
 		clear_nlink(d_inode(dentry));
 		fsstack_copy_attr_times(dir, lower_dir_inode);
@@ -555,7 +562,8 @@ static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
 }
 
 static int
-ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
+ecryptfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+	       struct dentry *dentry, umode_t mode, dev_t dev)
 {
 	int rc;
 	struct dentry *lower_dentry;
@@ -563,7 +571,8 @@ ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev
 
 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
 	lower_dir_dentry = lock_parent(lower_dentry);
-	rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev);
+	rc = vfs_mknod(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry,
+		       mode, dev);
 	if (rc || d_really_is_negative(lower_dentry))
 		goto out;
 	rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
@@ -579,9 +588,9 @@ out:
 }
 
 static int
-ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
-		struct inode *new_dir, struct dentry *new_dentry,
-		unsigned int flags)
+ecryptfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		struct dentry *old_dentry, struct inode *new_dir,
+		struct dentry *new_dentry, unsigned int flags)
 {
 	int rc;
 	struct dentry *lower_old_dentry;
@@ -590,6 +599,7 @@ ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	struct dentry *lower_new_dir_dentry;
 	struct dentry *trap;
 	struct inode *target_inode;
+	struct renamedata rd = {};
 
 	if (flags)
 		return -EINVAL;
@@ -619,9 +629,14 @@ ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 		rc = -ENOTEMPTY;
 		goto out_lock;
 	}
-	rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry,
-			d_inode(lower_new_dir_dentry), lower_new_dentry,
-			NULL, 0);
+
+	rd.old_mnt_userns	= &init_user_ns;
+	rd.old_dir		= d_inode(lower_old_dir_dentry);
+	rd.old_dentry		= lower_old_dentry;
+	rd.new_mnt_userns	= &init_user_ns;
+	rd.new_dir		= d_inode(lower_new_dir_dentry);
+	rd.new_dentry		= lower_new_dentry;
+	rc = vfs_rename(&rd);
 	if (rc)
 		goto out_lock;
 	if (target_inode)
@@ -855,16 +870,19 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 		struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
 
 		inode_lock(d_inode(lower_dentry));
-		rc = notify_change(lower_dentry, &lower_ia, NULL);
+		rc = notify_change(&init_user_ns, lower_dentry,
+				   &lower_ia, NULL);
 		inode_unlock(d_inode(lower_dentry));
 	}
 	return rc;
 }
 
 static int
-ecryptfs_permission(struct inode *inode, int mask)
+ecryptfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		    int mask)
 {
-	return inode_permission(ecryptfs_inode_to_lower(inode), mask);
+	return inode_permission(&init_user_ns,
+				ecryptfs_inode_to_lower(inode), mask);
 }
 
 /**
@@ -879,7 +897,8 @@ ecryptfs_permission(struct inode *inode, int mask)
  * All other metadata changes will be passed right to the lower filesystem,
  * and we will just update our inode to look like the lower.
  */
-static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
+static int ecryptfs_setattr(struct user_namespace *mnt_userns,
+			    struct dentry *dentry, struct iattr *ia)
 {
 	int rc = 0;
 	struct dentry *lower_dentry;
@@ -933,7 +952,7 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 	}
 	mutex_unlock(&crypt_stat->cs_mutex);
 
-	rc = setattr_prepare(dentry, ia);
+	rc = setattr_prepare(&init_user_ns, dentry, ia);
 	if (rc)
 		goto out;
 	if (ia->ia_valid & ATTR_SIZE) {
@@ -959,14 +978,15 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 		lower_ia.ia_valid &= ~ATTR_MODE;
 
 	inode_lock(d_inode(lower_dentry));
-	rc = notify_change(lower_dentry, &lower_ia, NULL);
+	rc = notify_change(&init_user_ns, lower_dentry, &lower_ia, NULL);
 	inode_unlock(d_inode(lower_dentry));
 out:
 	fsstack_copy_attr_all(inode, lower_inode);
 	return rc;
 }
 
-static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat,
+static int ecryptfs_getattr_link(struct user_namespace *mnt_userns,
+				 const struct path *path, struct kstat *stat,
 				 u32 request_mask, unsigned int flags)
 {
 	struct dentry *dentry = path->dentry;
@@ -975,7 +995,7 @@ static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat,
 
 	mount_crypt_stat = &ecryptfs_superblock_to_private(
 						dentry->d_sb)->mount_crypt_stat;
-	generic_fillattr(d_inode(dentry), stat);
+	generic_fillattr(&init_user_ns, d_inode(dentry), stat);
 	if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
 		char *target;
 		size_t targetsiz;
@@ -991,7 +1011,8 @@ static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat,
 	return rc;
 }
 
-static int ecryptfs_getattr(const struct path *path, struct kstat *stat,
+static int ecryptfs_getattr(struct user_namespace *mnt_userns,
+			    const struct path *path, struct kstat *stat,
 			    u32 request_mask, unsigned int flags)
 {
 	struct dentry *dentry = path->dentry;
@@ -1003,7 +1024,7 @@ static int ecryptfs_getattr(const struct path *path, struct kstat *stat,
 	if (!rc) {
 		fsstack_copy_attr_all(d_inode(dentry),
 				      ecryptfs_inode_to_lower(d_inode(dentry)));
-		generic_fillattr(d_inode(dentry), stat);
+		generic_fillattr(&init_user_ns, d_inode(dentry), stat);
 		stat->blocks = lower_stat.blocks;
 	}
 	return rc;
@@ -1025,7 +1046,7 @@ ecryptfs_setxattr(struct dentry *dentry, struct inode *inode,
 		goto out;
 	}
 	inode_lock(lower_inode);
-	rc = __vfs_setxattr_locked(lower_dentry, name, value, size, flags, NULL);
+	rc = __vfs_setxattr_locked(&init_user_ns, lower_dentry, name, value, size, flags, NULL);
 	inode_unlock(lower_inode);
 	if (!rc && inode)
 		fsstack_copy_attr_all(inode, lower_inode);
@@ -1091,7 +1112,7 @@ static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode,
 		goto out;
 	}
 	inode_lock(lower_inode);
-	rc = __vfs_removexattr(lower_dentry, name);
+	rc = __vfs_removexattr(&init_user_ns, lower_dentry, name);
 	inode_unlock(lower_inode);
 out:
 	return rc;
@@ -1135,6 +1156,7 @@ static int ecryptfs_xattr_get(const struct xattr_handler *handler,
 }
 
 static int ecryptfs_xattr_set(const struct xattr_handler *handler,
+			      struct user_namespace *mnt_userns,
 			      struct dentry *dentry, struct inode *inode,
 			      const char *name, const void *value, size_t size,
 			      int flags)
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index e63259fdef28..cdf40a54a35d 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -531,6 +531,12 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
 		goto out_free;
 	}
 
+	if (mnt_user_ns(path.mnt) != &init_user_ns) {
+		rc = -EINVAL;
+		printk(KERN_ERR "Mounting on idmapped mounts currently disallowed\n");
+		goto out_free;
+	}
+
 	if (check_ruid && !uid_eq(d_inode(path.dentry)->i_uid, current_uid())) {
 		rc = -EPERM;
 		printk(KERN_ERR "Mount of device (uid: %d) not owned by "
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 019572c6b39a..2f333a40ff4d 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -426,8 +426,8 @@ static int ecryptfs_write_inode_size_to_xattr(struct inode *ecryptfs_inode)
 	if (size < 0)
 		size = 8;
 	put_unaligned_be64(i_size_read(ecryptfs_inode), xattr_virt);
-	rc = __vfs_setxattr(lower_dentry, lower_inode, ECRYPTFS_XATTR_NAME,
-			    xattr_virt, size, 0);
+	rc = __vfs_setxattr(&init_user_ns, lower_dentry, lower_inode,
+			    ECRYPTFS_XATTR_NAME, xattr_virt, size, 0);
 	inode_unlock(lower_inode);
 	if (rc)
 		printk(KERN_ERR "Error whilst attempting to write inode size "
diff --git a/fs/efivarfs/file.c b/fs/efivarfs/file.c
index feaa5e182b7b..e6bc0302643b 100644
--- a/fs/efivarfs/file.c
+++ b/fs/efivarfs/file.c
@@ -137,7 +137,7 @@ efivarfs_ioc_setxflags(struct file *file, void __user *arg)
 	unsigned int oldflags = efivarfs_getflags(inode);
 	int error;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EACCES;
 
 	if (copy_from_user(&flags, arg, sizeof(flags)))
diff --git a/fs/efivarfs/inode.c b/fs/efivarfs/inode.c
index 0297ad95eb5c..14e2947975fd 100644
--- a/fs/efivarfs/inode.c
+++ b/fs/efivarfs/inode.c
@@ -66,8 +66,8 @@ bool efivarfs_valid_name(const char *str, int len)
 	return uuid_is_valid(s);
 }
 
-static int efivarfs_create(struct inode *dir, struct dentry *dentry,
-			  umode_t mode, bool excl)
+static int efivarfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+			   struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct inode *inode = NULL;
 	struct efivar_entry *var;
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 3e21c0e8adae..119fdce1b520 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -331,8 +331,9 @@ struct inode *erofs_iget(struct super_block *sb,
 	return inode;
 }
 
-int erofs_getattr(const struct path *path, struct kstat *stat,
-		  u32 request_mask, unsigned int query_flags)
+int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		  struct kstat *stat, u32 request_mask,
+		  unsigned int query_flags)
 {
 	struct inode *const inode = d_inode(path->dentry);
 
@@ -343,7 +344,7 @@ int erofs_getattr(const struct path *path, struct kstat *stat,
 	stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
 				  STATX_ATTR_IMMUTABLE);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	return 0;
 }
 
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 67a7ec945686..351dae524a0c 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -373,8 +373,9 @@ extern const struct inode_operations erofs_symlink_iops;
 extern const struct inode_operations erofs_fast_symlink_iops;
 
 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir);
-int erofs_getattr(const struct path *path, struct kstat *stat,
-		  u32 request_mask, unsigned int query_flags);
+int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		  struct kstat *stat, u32 request_mask,
+		  unsigned int query_flags);
 
 /* namei.c */
 extern const struct inode_operations erofs_dir_iops;
diff --git a/fs/exec.c b/fs/exec.c
index 5a853f03c233..6f3c02066ce3 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1404,14 +1404,15 @@ EXPORT_SYMBOL(begin_new_exec);
 void would_dump(struct linux_binprm *bprm, struct file *file)
 {
 	struct inode *inode = file_inode(file);
-	if (inode_permission(inode, MAY_READ) < 0) {
+	struct user_namespace *mnt_userns = file_mnt_user_ns(file);
+	if (inode_permission(mnt_userns, inode, MAY_READ) < 0) {
 		struct user_namespace *old, *user_ns;
 		bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
 
 		/* Ensure mm->user_ns contains the executable */
 		user_ns = old = bprm->mm->user_ns;
 		while ((user_ns != &init_user_ns) &&
-		       !privileged_wrt_inode_uidgid(user_ns, inode))
+		       !privileged_wrt_inode_uidgid(user_ns, mnt_userns, inode))
 			user_ns = user_ns->parent;
 
 		if (old != user_ns) {
@@ -1579,6 +1580,7 @@ static void check_unsafe_exec(struct linux_binprm *bprm)
 static void bprm_fill_uid(struct linux_binprm *bprm, struct file *file)
 {
 	/* Handle suid and sgid on files */
+	struct user_namespace *mnt_userns;
 	struct inode *inode;
 	unsigned int mode;
 	kuid_t uid;
@@ -1595,13 +1597,15 @@ static void bprm_fill_uid(struct linux_binprm *bprm, struct file *file)
 	if (!(mode & (S_ISUID|S_ISGID)))
 		return;
 
+	mnt_userns = file_mnt_user_ns(file);
+
 	/* Be careful if suid/sgid is set */
 	inode_lock(inode);
 
 	/* reload atomically mode/uid/gid now that lock held */
 	mode = inode->i_mode;
-	uid = inode->i_uid;
-	gid = inode->i_gid;
+	uid = i_uid_into_mnt(mnt_userns, inode);
+	gid = i_gid_into_mnt(mnt_userns, inode);
 	inode_unlock(inode);
 
 	/* We ignore suid/sgid if there are no mappings for them in the ns */
diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
index 764bc645241e..fa21421a14d9 100644
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -416,9 +416,11 @@ int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count);
 extern const struct file_operations exfat_file_operations;
 int __exfat_truncate(struct inode *inode, loff_t new_size);
 void exfat_truncate(struct inode *inode, loff_t size);
-int exfat_setattr(struct dentry *dentry, struct iattr *attr);
-int exfat_getattr(const struct path *path, struct kstat *stat,
-		unsigned int request_mask, unsigned int query_flags);
+int exfat_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		  struct iattr *attr);
+int exfat_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		  struct kstat *stat, unsigned int request_mask,
+		  unsigned int query_flags);
 int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
 
 /* namei.c */
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index 183ffdf4d43c..f783cf38dd8e 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -267,13 +267,14 @@ write_size:
 	mutex_unlock(&sbi->s_lock);
 }
 
-int exfat_getattr(const struct path *path, struct kstat *stat,
-		unsigned int request_mask, unsigned int query_flags)
+int exfat_getattr(struct user_namespace *mnt_uerns, const struct path *path,
+		  struct kstat *stat, unsigned int request_mask,
+		  unsigned int query_flags)
 {
 	struct inode *inode = d_backing_inode(path->dentry);
 	struct exfat_inode_info *ei = EXFAT_I(inode);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	exfat_truncate_atime(&stat->atime);
 	stat->result_mask |= STATX_BTIME;
 	stat->btime.tv_sec = ei->i_crtime.tv_sec;
@@ -282,7 +283,8 @@ int exfat_getattr(const struct path *path, struct kstat *stat,
 	return 0;
 }
 
-int exfat_setattr(struct dentry *dentry, struct iattr *attr)
+int exfat_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		  struct iattr *attr)
 {
 	struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
 	struct inode *inode = dentry->d_inode;
@@ -305,7 +307,7 @@ int exfat_setattr(struct dentry *dentry, struct iattr *attr)
 				ATTR_TIMES_SET);
 	}
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	attr->ia_valid = ia_valid;
 	if (error)
 		goto out;
@@ -340,7 +342,7 @@ int exfat_setattr(struct dentry *dentry, struct iattr *attr)
 		up_write(&EXFAT_I(inode)->truncate_lock);
 	}
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	exfat_truncate_atime(&inode->i_atime);
 	mark_inode_dirty(inode);
 
diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index 2932b23a3b6c..d9e8ec689c55 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -541,8 +541,8 @@ out:
 	return ret;
 }
 
-static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		bool excl)
+static int exfat_create(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct super_block *sb = dir->i_sb;
 	struct inode *inode;
@@ -827,7 +827,8 @@ unlock:
 	return err;
 }
 
-static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int exfat_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode)
 {
 	struct super_block *sb = dir->i_sb;
 	struct inode *inode;
@@ -1318,9 +1319,10 @@ out:
 	return ret;
 }
 
-static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry,
-		struct inode *new_dir, struct dentry *new_dentry,
-		unsigned int flags)
+static int exfat_rename(struct user_namespace *mnt_userns,
+			struct inode *old_dir, struct dentry *old_dentry,
+			struct inode *new_dir, struct dentry *new_dentry,
+			unsigned int flags)
 {
 	struct inode *old_inode, *new_inode;
 	struct super_block *sb = old_dir->i_sb;
diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index cf4c77f8dd08..b9a9db98e94b 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -216,14 +216,16 @@ __ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
  * inode->i_mutex: down
  */
 int
-ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+ext2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+	     struct posix_acl *acl, int type)
 {
 	int error;
 	int update_mode = 0;
 	umode_t mode = inode->i_mode;
 
 	if (type == ACL_TYPE_ACCESS && acl) {
-		error = posix_acl_update_mode(inode, &mode, &acl);
+		error = posix_acl_update_mode(&init_user_ns, inode, &mode,
+					      &acl);
 		if (error)
 			return error;
 		update_mode = 1;
diff --git a/fs/ext2/acl.h b/fs/ext2/acl.h
index 0f01c759daac..917db5f6630a 100644
--- a/fs/ext2/acl.h
+++ b/fs/ext2/acl.h
@@ -56,7 +56,8 @@ static inline int ext2_acl_count(size_t size)
 
 /* acl.c */
 extern struct posix_acl *ext2_get_acl(struct inode *inode, int type);
-extern int ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+extern int ext2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+			struct posix_acl *acl, int type);
 extern int ext2_init_acl (struct inode *, struct inode *);
 
 #else
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 2a4175fbaf5e..3309fb2d327a 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -764,8 +764,9 @@ extern struct inode *ext2_iget (struct super_block *, unsigned long);
 extern int ext2_write_inode (struct inode *, struct writeback_control *);
 extern void ext2_evict_inode(struct inode *);
 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
-extern int ext2_setattr (struct dentry *, struct iattr *);
-extern int ext2_getattr (const struct path *, struct kstat *, u32, unsigned int);
+extern int ext2_setattr (struct user_namespace *, struct dentry *, struct iattr *);
+extern int ext2_getattr (struct user_namespace *, const struct path *,
+			 struct kstat *, u32, unsigned int);
 extern void ext2_set_inode_flags(struct inode *inode);
 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 		       u64 start, u64 len);
diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
index 432c3febea6d..df14e750e9fe 100644
--- a/fs/ext2/ialloc.c
+++ b/fs/ext2/ialloc.c
@@ -551,7 +551,7 @@ got:
 		inode->i_uid = current_fsuid();
 		inode->i_gid = dir->i_gid;
 	} else
-		inode_init_owner(inode, dir, mode);
+		inode_init_owner(&init_user_ns, inode, dir, mode);
 
 	inode->i_ino = ino;
 	inode->i_blocks = 0;
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 78c417d3c898..68178b2234bd 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1638,8 +1638,8 @@ int ext2_write_inode(struct inode *inode, struct writeback_control *wbc)
 	return __ext2_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 }
 
-int ext2_getattr(const struct path *path, struct kstat *stat,
-		u32 request_mask, unsigned int query_flags)
+int ext2_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		 struct kstat *stat, u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct ext2_inode_info *ei = EXT2_I(inode);
@@ -1660,16 +1660,17 @@ int ext2_getattr(const struct path *path, struct kstat *stat,
 			STATX_ATTR_IMMUTABLE |
 			STATX_ATTR_NODUMP);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	return 0;
 }
 
-int ext2_setattr(struct dentry *dentry, struct iattr *iattr)
+int ext2_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		 struct iattr *iattr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error;
 
-	error = setattr_prepare(dentry, iattr);
+	error = setattr_prepare(&init_user_ns, dentry, iattr);
 	if (error)
 		return error;
 
@@ -1689,9 +1690,9 @@ int ext2_setattr(struct dentry *dentry, struct iattr *iattr)
 		if (error)
 			return error;
 	}
-	setattr_copy(inode, iattr);
+	setattr_copy(&init_user_ns, inode, iattr);
 	if (iattr->ia_valid & ATTR_MODE)
-		error = posix_acl_chmod(inode, inode->i_mode);
+		error = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
 	mark_inode_dirty(inode);
 
 	return error;
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
index 32a8d10b579d..b399cbb7022d 100644
--- a/fs/ext2/ioctl.c
+++ b/fs/ext2/ioctl.c
@@ -39,7 +39,7 @@ long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		if (ret)
 			return ret;
 
-		if (!inode_owner_or_capable(inode)) {
+		if (!inode_owner_or_capable(&init_user_ns, inode)) {
 			ret = -EACCES;
 			goto setflags_out;
 		}
@@ -84,7 +84,7 @@ setflags_out:
 	case EXT2_IOC_SETVERSION: {
 		__u32 generation;
 
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(&init_user_ns, inode))
 			return -EPERM;
 		ret = mnt_want_write_file(filp);
 		if (ret)
@@ -117,7 +117,7 @@ setversion_out:
 		if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
 			return -ENOTTY;
 
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(&init_user_ns, inode))
 			return -EACCES;
 
 		if (get_user(rsv_window_size, (int __user *)arg))
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index ea980f1e2e99..3367384d344d 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -100,7 +100,9 @@ struct dentry *ext2_get_parent(struct dentry *child)
  * If the create succeeds, we fill in the inode information
  * with d_instantiate(). 
  */
-static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
+static int ext2_create (struct user_namespace * mnt_userns,
+			struct inode * dir, struct dentry * dentry,
+			umode_t mode, bool excl)
 {
 	struct inode *inode;
 	int err;
@@ -118,7 +120,8 @@ static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode
 	return ext2_add_nondir(dentry, inode);
 }
 
-static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int ext2_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode)
 {
 	struct inode *inode = ext2_new_inode(dir, mode, NULL);
 	if (IS_ERR(inode))
@@ -131,7 +134,8 @@ static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 	return 0;
 }
 
-static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
+static int ext2_mknod (struct user_namespace * mnt_userns, struct inode * dir,
+	struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct inode * inode;
 	int err;
@@ -151,8 +155,8 @@ static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode,
 	return err;
 }
 
-static int ext2_symlink (struct inode * dir, struct dentry * dentry,
-	const char * symname)
+static int ext2_symlink (struct user_namespace * mnt_userns, struct inode * dir,
+	struct dentry * dentry, const char * symname)
 {
 	struct super_block * sb = dir->i_sb;
 	int err = -ENAMETOOLONG;
@@ -225,7 +229,8 @@ static int ext2_link (struct dentry * old_dentry, struct inode * dir,
 	return err;
 }
 
-static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
+static int ext2_mkdir(struct user_namespace * mnt_userns,
+	struct inode * dir, struct dentry * dentry, umode_t mode)
 {
 	struct inode * inode;
 	int err;
@@ -315,8 +320,9 @@ static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
 	return err;
 }
 
-static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
-			struct inode * new_dir,	struct dentry * new_dentry,
+static int ext2_rename (struct user_namespace * mnt_userns,
+			struct inode * old_dir, struct dentry * old_dentry,
+			struct inode * new_dir, struct dentry * new_dentry,
 			unsigned int flags)
 {
 	struct inode * old_inode = d_inode(old_dentry);
diff --git a/fs/ext2/xattr_security.c b/fs/ext2/xattr_security.c
index 9a682e440acb..ebade1f52451 100644
--- a/fs/ext2/xattr_security.c
+++ b/fs/ext2/xattr_security.c
@@ -19,6 +19,7 @@ ext2_xattr_security_get(const struct xattr_handler *handler,
 
 static int
 ext2_xattr_security_set(const struct xattr_handler *handler,
+			struct user_namespace *mnt_userns,
 			struct dentry *unused, struct inode *inode,
 			const char *name, const void *value,
 			size_t size, int flags)
diff --git a/fs/ext2/xattr_trusted.c b/fs/ext2/xattr_trusted.c
index 49add1107850..18a87d5dd1ab 100644
--- a/fs/ext2/xattr_trusted.c
+++ b/fs/ext2/xattr_trusted.c
@@ -26,6 +26,7 @@ ext2_xattr_trusted_get(const struct xattr_handler *handler,
 
 static int
 ext2_xattr_trusted_set(const struct xattr_handler *handler,
+		       struct user_namespace *mnt_userns,
 		       struct dentry *unused, struct inode *inode,
 		       const char *name, const void *value,
 		       size_t size, int flags)
diff --git a/fs/ext2/xattr_user.c b/fs/ext2/xattr_user.c
index c243a3b4d69d..58092449f8ff 100644
--- a/fs/ext2/xattr_user.c
+++ b/fs/ext2/xattr_user.c
@@ -30,6 +30,7 @@ ext2_xattr_user_get(const struct xattr_handler *handler,
 
 static int
 ext2_xattr_user_set(const struct xattr_handler *handler,
+		    struct user_namespace *mnt_userns,
 		    struct dentry *unused, struct inode *inode,
 		    const char *name, const void *value,
 		    size_t size, int flags)
diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index 68aaed48315f..c5eaffccecc3 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -222,7 +222,8 @@ __ext4_set_acl(handle_t *handle, struct inode *inode, int type,
 }
 
 int
-ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+ext4_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+	     struct posix_acl *acl, int type)
 {
 	handle_t *handle;
 	int error, credits, retries = 0;
@@ -245,7 +246,7 @@ retry:
 	ext4_fc_start_update(inode);
 
 	if ((type == ACL_TYPE_ACCESS) && acl) {
-		error = posix_acl_update_mode(inode, &mode, &acl);
+		error = posix_acl_update_mode(mnt_userns, inode, &mode, &acl);
 		if (error)
 			goto out_stop;
 		if (mode != inode->i_mode)
diff --git a/fs/ext4/acl.h b/fs/ext4/acl.h
index 9b63f5416a2f..84b8942a57f2 100644
--- a/fs/ext4/acl.h
+++ b/fs/ext4/acl.h
@@ -56,7 +56,8 @@ static inline int ext4_acl_count(size_t size)
 
 /* acl.c */
 struct posix_acl *ext4_get_acl(struct inode *inode, int type);
-int ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+int ext4_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		 struct posix_acl *acl, int type);
 extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
 
 #else  /* CONFIG_EXT4_FS_POSIX_ACL */
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 2866d249f3d2..644fd69185d3 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2755,18 +2755,19 @@ extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
 
 /* ialloc.c */
 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
-extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
+extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
+				      struct inode *, umode_t,
 				      const struct qstr *qstr, __u32 goal,
 				      uid_t *owner, __u32 i_flags,
 				      int handle_type, unsigned int line_no,
 				      int nblocks);
 
-#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
-	__ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
-			 i_flags, 0, 0, 0)
-#define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
+#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags)          \
+	__ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr),       \
+			 (goal), (owner), i_flags, 0, 0, 0)
+#define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
 				    type, nblocks)		    \
-	__ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
+	__ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
 			 0, (type), __LINE__, (nblocks))
 
 
@@ -2877,11 +2878,14 @@ extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
 	__ext4_iget((sb), (ino), (flags), __func__, __LINE__)
 
 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
-extern int  ext4_setattr(struct dentry *, struct iattr *);
-extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
+extern int  ext4_setattr(struct user_namespace *, struct dentry *,
+			 struct iattr *);
+extern int  ext4_getattr(struct user_namespace *, const struct path *,
+			 struct kstat *, u32, unsigned int);
 extern void ext4_evict_inode(struct inode *);
 extern void ext4_clear_inode(struct inode *);
-extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
+extern int  ext4_file_getattr(struct user_namespace *, const struct path *,
+			      struct kstat *, u32, unsigned int);
 extern int  ext4_sync_inode(handle_t *, struct inode *);
 extern void ext4_dirty_inode(struct inode *, int);
 extern int ext4_change_inode_journal_flag(struct inode *, int);
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 20f2fcb799f5..633ae7becd61 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -919,7 +919,8 @@ static int ext4_xattr_credits_for_new_inode(struct inode *dir, mode_t mode,
  * For other inodes, search forward from the parent directory's block
  * group to find a free inode.
  */
-struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
+struct inode *__ext4_new_inode(struct user_namespace *mnt_userns,
+			       handle_t *handle, struct inode *dir,
 			       umode_t mode, const struct qstr *qstr,
 			       __u32 goal, uid_t *owner, __u32 i_flags,
 			       int handle_type, unsigned int line_no,
@@ -969,10 +970,10 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
 		i_gid_write(inode, owner[1]);
 	} else if (test_opt(sb, GRPID)) {
 		inode->i_mode = mode;
-		inode->i_uid = current_fsuid();
+		inode->i_uid = fsuid_into_mnt(mnt_userns);
 		inode->i_gid = dir->i_gid;
 	} else
-		inode_init_owner(inode, dir, mode);
+		inode_init_owner(mnt_userns, inode, dir, mode);
 
 	if (ext4_has_feature_project(sb) &&
 	    ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT))
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index de7905284e28..650c5acd2f2d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -20,6 +20,7 @@
  */
 
 #include <linux/fs.h>
+#include <linux/mount.h>
 #include <linux/time.h>
 #include <linux/highuid.h>
 #include <linux/pagemap.h>
@@ -5315,7 +5316,8 @@ static void ext4_wait_for_tail_page_commit(struct inode *inode)
  *
  * Called with inode->i_mutex down.
  */
-int ext4_setattr(struct dentry *dentry, struct iattr *attr)
+int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		 struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error, rc = 0;
@@ -5333,7 +5335,7 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 				  ATTR_GID | ATTR_TIMES_SET))))
 		return -EPERM;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(mnt_userns, dentry, attr);
 	if (error)
 		return error;
 
@@ -5508,7 +5510,7 @@ out_mmap_sem:
 	}
 
 	if (!error) {
-		setattr_copy(inode, attr);
+		setattr_copy(mnt_userns, inode, attr);
 		mark_inode_dirty(inode);
 	}
 
@@ -5520,7 +5522,7 @@ out_mmap_sem:
 		ext4_orphan_del(NULL, inode);
 
 	if (!error && (ia_valid & ATTR_MODE))
-		rc = posix_acl_chmod(inode, inode->i_mode);
+		rc = posix_acl_chmod(mnt_userns, inode, inode->i_mode);
 
 err_out:
 	if  (error)
@@ -5531,8 +5533,8 @@ err_out:
 	return error;
 }
 
-int ext4_getattr(const struct path *path, struct kstat *stat,
-		 u32 request_mask, unsigned int query_flags)
+int ext4_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		 struct kstat *stat, u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct ext4_inode *raw_inode;
@@ -5567,17 +5569,18 @@ int ext4_getattr(const struct path *path, struct kstat *stat,
 				  STATX_ATTR_NODUMP |
 				  STATX_ATTR_VERITY);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(mnt_userns, inode, stat);
 	return 0;
 }
 
-int ext4_file_getattr(const struct path *path, struct kstat *stat,
+int ext4_file_getattr(struct user_namespace *mnt_userns,
+		      const struct path *path, struct kstat *stat,
 		      u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
 	u64 delalloc_blocks;
 
-	ext4_getattr(path, stat, request_mask, query_flags);
+	ext4_getattr(mnt_userns, path, stat, request_mask, query_flags);
 
 	/*
 	 * If there is inline data in the inode, the inode will normally not
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 713b1ae44c1a..a2cf35066f46 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -107,10 +107,12 @@ void ext4_reset_inode_seed(struct inode *inode)
  * important fields of the inodes.
  *
  * @sb:         the super block of the filesystem
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
  *
  */
 static long swap_inode_boot_loader(struct super_block *sb,
+				struct user_namespace *mnt_userns,
 				struct inode *inode)
 {
 	handle_t *handle;
@@ -139,7 +141,8 @@ static long swap_inode_boot_loader(struct super_block *sb,
 	}
 
 	if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
-	    !inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
+	    !inode_owner_or_capable(mnt_userns, inode) ||
+	    !capable(CAP_SYS_ADMIN)) {
 		err = -EPERM;
 		goto journal_err_out;
 	}
@@ -814,6 +817,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	struct inode *inode = file_inode(filp);
 	struct super_block *sb = inode->i_sb;
 	struct ext4_inode_info *ei = EXT4_I(inode);
+	struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
 	unsigned int flags;
 
 	ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
@@ -829,7 +833,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	case FS_IOC_SETFLAGS: {
 		int err;
 
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(mnt_userns, inode))
 			return -EACCES;
 
 		if (get_user(flags, (int __user *) arg))
@@ -871,7 +875,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		__u32 generation;
 		int err;
 
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(mnt_userns, inode))
 			return -EPERM;
 
 		if (ext4_has_metadata_csum(inode->i_sb)) {
@@ -1010,7 +1014,7 @@ mext_out:
 	case EXT4_IOC_MIGRATE:
 	{
 		int err;
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(mnt_userns, inode))
 			return -EACCES;
 
 		err = mnt_want_write_file(filp);
@@ -1032,7 +1036,7 @@ mext_out:
 	case EXT4_IOC_ALLOC_DA_BLKS:
 	{
 		int err;
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(mnt_userns, inode))
 			return -EACCES;
 
 		err = mnt_want_write_file(filp);
@@ -1051,7 +1055,7 @@ mext_out:
 		err = mnt_want_write_file(filp);
 		if (err)
 			return err;
-		err = swap_inode_boot_loader(sb, inode);
+		err = swap_inode_boot_loader(sb, mnt_userns, inode);
 		mnt_drop_write_file(filp);
 		return err;
 	}
@@ -1217,7 +1221,7 @@ resizefs_out:
 
 	case EXT4_IOC_CLEAR_ES_CACHE:
 	{
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(mnt_userns, inode))
 			return -EACCES;
 		ext4_clear_inode_es(inode);
 		return 0;
@@ -1263,7 +1267,7 @@ resizefs_out:
 			return -EFAULT;
 
 		/* Make sure caller has proper permission */
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(mnt_userns, inode))
 			return -EACCES;
 
 		if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index cf652ba3e74d..877c602ae063 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2596,8 +2596,8 @@ static int ext4_add_nondir(handle_t *handle,
  * If the create succeeds, we fill in the inode information
  * with d_instantiate().
  */
-static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		       bool excl)
+static int ext4_create(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, bool excl)
 {
 	handle_t *handle;
 	struct inode *inode;
@@ -2610,8 +2610,8 @@ static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 	credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
 		   EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
 retry:
-	inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
-					    NULL, EXT4_HT_DIR, credits);
+	inode = ext4_new_inode_start_handle(mnt_userns, dir, mode, &dentry->d_name,
+					    0, NULL, EXT4_HT_DIR, credits);
 	handle = ext4_journal_current_handle();
 	err = PTR_ERR(inode);
 	if (!IS_ERR(inode)) {
@@ -2631,8 +2631,8 @@ retry:
 	return err;
 }
 
-static int ext4_mknod(struct inode *dir, struct dentry *dentry,
-		      umode_t mode, dev_t rdev)
+static int ext4_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	handle_t *handle;
 	struct inode *inode;
@@ -2645,8 +2645,8 @@ static int ext4_mknod(struct inode *dir, struct dentry *dentry,
 	credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
 		   EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
 retry:
-	inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
-					    NULL, EXT4_HT_DIR, credits);
+	inode = ext4_new_inode_start_handle(mnt_userns, dir, mode, &dentry->d_name,
+					    0, NULL, EXT4_HT_DIR, credits);
 	handle = ext4_journal_current_handle();
 	err = PTR_ERR(inode);
 	if (!IS_ERR(inode)) {
@@ -2665,7 +2665,8 @@ retry:
 	return err;
 }
 
-static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int ext4_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode)
 {
 	handle_t *handle;
 	struct inode *inode;
@@ -2676,7 +2677,7 @@ static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 		return err;
 
 retry:
-	inode = ext4_new_inode_start_handle(dir, mode,
+	inode = ext4_new_inode_start_handle(mnt_userns, dir, mode,
 					    NULL, 0, NULL,
 					    EXT4_HT_DIR,
 			EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
@@ -2774,7 +2775,8 @@ out:
 	return err;
 }
 
-static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int ext4_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode)
 {
 	handle_t *handle;
 	struct inode *inode;
@@ -2790,7 +2792,7 @@ static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 	credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
 		   EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
 retry:
-	inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode,
+	inode = ext4_new_inode_start_handle(mnt_userns, dir, S_IFDIR | mode,
 					    &dentry->d_name,
 					    0, NULL, EXT4_HT_DIR, credits);
 	handle = ext4_journal_current_handle();
@@ -3292,7 +3294,7 @@ out_trace:
 	return retval;
 }
 
-static int ext4_symlink(struct inode *dir,
+static int ext4_symlink(struct user_namespace *mnt_userns, struct inode *dir,
 			struct dentry *dentry, const char *symname)
 {
 	handle_t *handle;
@@ -3333,7 +3335,7 @@ static int ext4_symlink(struct inode *dir,
 			  EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3;
 	}
 
-	inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO,
+	inode = ext4_new_inode_start_handle(mnt_userns, dir, S_IFLNK|S_IRWXUGO,
 					    &dentry->d_name, 0, NULL,
 					    EXT4_HT_DIR, credits);
 	handle = ext4_journal_current_handle();
@@ -3662,7 +3664,8 @@ static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
 	}
 }
 
-static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent,
+static struct inode *ext4_whiteout_for_rename(struct user_namespace *mnt_userns,
+					      struct ext4_renament *ent,
 					      int credits, handle_t **h)
 {
 	struct inode *wh;
@@ -3676,7 +3679,8 @@ static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent,
 	credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) +
 		    EXT4_XATTR_TRANS_BLOCKS + 4);
 retry:
-	wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE,
+	wh = ext4_new_inode_start_handle(mnt_userns, ent->dir,
+					 S_IFCHR | WHITEOUT_MODE,
 					 &ent->dentry->d_name, 0, NULL,
 					 EXT4_HT_DIR, credits);
 
@@ -3703,9 +3707,9 @@ retry:
  * while new_{dentry,inode) refers to the destination dentry/inode
  * This comes from rename(const char *oldpath, const char *newpath)
  */
-static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
-		       struct inode *new_dir, struct dentry *new_dentry,
-		       unsigned int flags)
+static int ext4_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		       struct dentry *old_dentry, struct inode *new_dir,
+		       struct dentry *new_dentry, unsigned int flags)
 {
 	handle_t *handle = NULL;
 	struct ext4_renament old = {
@@ -3789,7 +3793,7 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 			goto end_rename;
 		}
 	} else {
-		whiteout = ext4_whiteout_for_rename(&old, credits, &handle);
+		whiteout = ext4_whiteout_for_rename(mnt_userns, &old, credits, &handle);
 		if (IS_ERR(whiteout)) {
 			retval = PTR_ERR(whiteout);
 			whiteout = NULL;
@@ -4085,7 +4089,8 @@ end_rename:
 	return retval;
 }
 
-static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
+static int ext4_rename2(struct user_namespace *mnt_userns,
+			struct inode *old_dir, struct dentry *old_dentry,
 			struct inode *new_dir, struct dentry *new_dentry,
 			unsigned int flags)
 {
@@ -4107,7 +4112,7 @@ static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
 					 new_dir, new_dentry);
 	}
 
-	return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
+	return ext4_rename(mnt_userns, old_dir, old_dentry, new_dir, new_dentry, flags);
 }
 
 /*
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index fb5985102c1d..802bd26ed01c 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -6654,7 +6654,7 @@ static struct file_system_type ext4_fs_type = {
 	.name		= "ext4",
 	.mount		= ext4_mount,
 	.kill_sb	= kill_block_super,
-	.fs_flags	= FS_REQUIRES_DEV,
+	.fs_flags	= FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
 };
 MODULE_ALIAS_FS("ext4");
 
diff --git a/fs/ext4/xattr_hurd.c b/fs/ext4/xattr_hurd.c
index 8cfa74a56361..c78df5790377 100644
--- a/fs/ext4/xattr_hurd.c
+++ b/fs/ext4/xattr_hurd.c
@@ -32,6 +32,7 @@ ext4_xattr_hurd_get(const struct xattr_handler *handler,
 
 static int
 ext4_xattr_hurd_set(const struct xattr_handler *handler,
+		    struct user_namespace *mnt_userns,
 		    struct dentry *unused, struct inode *inode,
 		    const char *name, const void *value,
 		    size_t size, int flags)
diff --git a/fs/ext4/xattr_security.c b/fs/ext4/xattr_security.c
index 197a9d8a15ef..8213f66f7b2d 100644
--- a/fs/ext4/xattr_security.c
+++ b/fs/ext4/xattr_security.c
@@ -23,6 +23,7 @@ ext4_xattr_security_get(const struct xattr_handler *handler,
 
 static int
 ext4_xattr_security_set(const struct xattr_handler *handler,
+			struct user_namespace *mnt_userns,
 			struct dentry *unused, struct inode *inode,
 			const char *name, const void *value,
 			size_t size, int flags)
diff --git a/fs/ext4/xattr_trusted.c b/fs/ext4/xattr_trusted.c
index e9389e5d75c3..7c21ffb26d25 100644
--- a/fs/ext4/xattr_trusted.c
+++ b/fs/ext4/xattr_trusted.c
@@ -30,6 +30,7 @@ ext4_xattr_trusted_get(const struct xattr_handler *handler,
 
 static int
 ext4_xattr_trusted_set(const struct xattr_handler *handler,
+		       struct user_namespace *mnt_userns,
 		       struct dentry *unused, struct inode *inode,
 		       const char *name, const void *value,
 		       size_t size, int flags)
diff --git a/fs/ext4/xattr_user.c b/fs/ext4/xattr_user.c
index d4546184b34b..2fe7ff0a479c 100644
--- a/fs/ext4/xattr_user.c
+++ b/fs/ext4/xattr_user.c
@@ -31,6 +31,7 @@ ext4_xattr_user_get(const struct xattr_handler *handler,
 
 static int
 ext4_xattr_user_set(const struct xattr_handler *handler,
+		    struct user_namespace *mnt_userns,
 		    struct dentry *unused, struct inode *inode,
 		    const char *name, const void *value,
 		    size_t size, int flags)
diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
index 732ec10e7890..965037a9c205 100644
--- a/fs/f2fs/acl.c
+++ b/fs/f2fs/acl.c
@@ -214,8 +214,8 @@ static int f2fs_acl_update_mode(struct inode *inode, umode_t *mode_p,
 		return error;
 	if (error == 0)
 		*acl = NULL;
-	if (!in_group_p(inode->i_gid) &&
-	    !capable_wrt_inode_uidgid(inode, CAP_FSETID))
+	if (!in_group_p(i_gid_into_mnt(&init_user_ns, inode)) &&
+	    !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID))
 		mode &= ~S_ISGID;
 	*mode_p = mode;
 	return 0;
@@ -269,7 +269,8 @@ static int __f2fs_set_acl(struct inode *inode, int type,
 	return error;
 }
 
-int f2fs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+int f2fs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		 struct posix_acl *acl, int type)
 {
 	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
 		return -EIO;
diff --git a/fs/f2fs/acl.h b/fs/f2fs/acl.h
index 124868c13f80..986fd1bc780b 100644
--- a/fs/f2fs/acl.h
+++ b/fs/f2fs/acl.h
@@ -34,7 +34,8 @@ struct f2fs_acl_header {
 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 
 extern struct posix_acl *f2fs_get_acl(struct inode *, int);
-extern int f2fs_set_acl(struct inode *, struct posix_acl *, int);
+extern int f2fs_set_acl(struct user_namespace *, struct inode *,
+			struct posix_acl *, int);
 extern int f2fs_init_acl(struct inode *, struct inode *, struct page *,
 							struct page *);
 #else
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 506c801880f3..e2d302ae3a46 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3187,9 +3187,10 @@ void f2fs_truncate_data_blocks(struct dnode_of_data *dn);
 int f2fs_do_truncate_blocks(struct inode *inode, u64 from, bool lock);
 int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock);
 int f2fs_truncate(struct inode *inode);
-int f2fs_getattr(const struct path *path, struct kstat *stat,
-			u32 request_mask, unsigned int flags);
-int f2fs_setattr(struct dentry *dentry, struct iattr *attr);
+int f2fs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		 struct kstat *stat, u32 request_mask, unsigned int flags);
+int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		 struct iattr *attr);
 int f2fs_truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end);
 void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count);
 int f2fs_precache_extents(struct inode *inode);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 471a6ff0c937..d26ff2ae3f5e 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -789,8 +789,8 @@ int f2fs_truncate(struct inode *inode)
 	return 0;
 }
 
-int f2fs_getattr(const struct path *path, struct kstat *stat,
-		 u32 request_mask, unsigned int query_flags)
+int f2fs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		 struct kstat *stat, u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct f2fs_inode_info *fi = F2FS_I(inode);
@@ -826,7 +826,7 @@ int f2fs_getattr(const struct path *path, struct kstat *stat,
 				  STATX_ATTR_NODUMP |
 				  STATX_ATTR_VERITY);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 
 	/* we need to show initial sectors used for inline_data/dentries */
 	if ((S_ISREG(inode->i_mode) && f2fs_has_inline_data(inode)) ||
@@ -837,7 +837,8 @@ int f2fs_getattr(const struct path *path, struct kstat *stat,
 }
 
 #ifdef CONFIG_F2FS_FS_POSIX_ACL
-static void __setattr_copy(struct inode *inode, const struct iattr *attr)
+static void __setattr_copy(struct user_namespace *mnt_userns,
+			   struct inode *inode, const struct iattr *attr)
 {
 	unsigned int ia_valid = attr->ia_valid;
 
@@ -853,9 +854,9 @@ static void __setattr_copy(struct inode *inode, const struct iattr *attr)
 		inode->i_ctime = attr->ia_ctime;
 	if (ia_valid & ATTR_MODE) {
 		umode_t mode = attr->ia_mode;
+		kgid_t kgid = i_gid_into_mnt(mnt_userns, inode);
 
-		if (!in_group_p(inode->i_gid) &&
-			!capable_wrt_inode_uidgid(inode, CAP_FSETID))
+		if (!in_group_p(kgid) && !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID))
 			mode &= ~S_ISGID;
 		set_acl_inode(inode, mode);
 	}
@@ -864,7 +865,8 @@ static void __setattr_copy(struct inode *inode, const struct iattr *attr)
 #define __setattr_copy setattr_copy
 #endif
 
-int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
+int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		 struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	int err;
@@ -884,7 +886,7 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 		!f2fs_is_compress_backend_ready(inode))
 		return -EOPNOTSUPP;
 
-	err = setattr_prepare(dentry, attr);
+	err = setattr_prepare(&init_user_ns, dentry, attr);
 	if (err)
 		return err;
 
@@ -960,10 +962,10 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 		spin_unlock(&F2FS_I(inode)->i_size_lock);
 	}
 
-	__setattr_copy(inode, attr);
+	__setattr_copy(&init_user_ns, inode, attr);
 
 	if (attr->ia_valid & ATTR_MODE) {
-		err = posix_acl_chmod(inode, f2fs_get_inode_mode(inode));
+		err = posix_acl_chmod(&init_user_ns, inode, f2fs_get_inode_mode(inode));
 
 		if (is_inode_flag_set(inode, FI_ACL_MODE)) {
 			if (!err)
@@ -1978,7 +1980,7 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
 	u32 iflags;
 	int ret;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EACCES;
 
 	if (get_user(fsflags, (int __user *)arg))
@@ -2025,7 +2027,7 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	int ret;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EACCES;
 
 	if (!S_ISREG(inode->i_mode))
@@ -2092,7 +2094,7 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
 	struct inode *inode = file_inode(filp);
 	int ret;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EACCES;
 
 	ret = mnt_want_write_file(filp);
@@ -2134,7 +2136,7 @@ static int f2fs_ioc_start_volatile_write(struct file *filp)
 	struct inode *inode = file_inode(filp);
 	int ret;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EACCES;
 
 	if (!S_ISREG(inode->i_mode))
@@ -2169,7 +2171,7 @@ static int f2fs_ioc_release_volatile_write(struct file *filp)
 	struct inode *inode = file_inode(filp);
 	int ret;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EACCES;
 
 	ret = mnt_want_write_file(filp);
@@ -2198,7 +2200,7 @@ static int f2fs_ioc_abort_volatile_write(struct file *filp)
 	struct inode *inode = file_inode(filp);
 	int ret;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EACCES;
 
 	ret = mnt_want_write_file(filp);
@@ -3175,7 +3177,7 @@ static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)
 		return -EFAULT;
 
 	/* Make sure caller has proper permission */
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EACCES;
 
 	if (fa.fsx_xflags & ~F2FS_SUPPORTED_XFLAGS)
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 887804968576..17bd072a5d39 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -46,7 +46,7 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
 
 	nid_free = true;
 
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 
 	inode->i_ino = ino;
 	inode->i_blocks = 0;
@@ -314,8 +314,8 @@ static void set_compress_inode(struct f2fs_sb_info *sbi, struct inode *inode,
 	}
 }
 
-static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-						bool excl)
+static int f2fs_create(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 	struct inode *inode;
@@ -637,8 +637,8 @@ static const char *f2fs_get_link(struct dentry *dentry,
 	return link;
 }
 
-static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
-					const char *symname)
+static int f2fs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, const char *symname)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 	struct inode *inode;
@@ -717,7 +717,8 @@ out_free_encrypted_link:
 	return err;
 }
 
-static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int f2fs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 	struct inode *inode;
@@ -770,8 +771,8 @@ static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 	return -ENOTEMPTY;
 }
 
-static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
-				umode_t mode, dev_t rdev)
+static int f2fs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 	struct inode *inode;
@@ -878,7 +879,8 @@ out:
 	return err;
 }
 
-static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 
@@ -1255,7 +1257,8 @@ out:
 	return err;
 }
 
-static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
+static int f2fs_rename2(struct user_namespace *mnt_userns,
+			struct inode *old_dir, struct dentry *old_dentry,
 			struct inode *new_dir, struct dentry *new_dentry,
 			unsigned int flags)
 {
diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
index 8159fae74b9a..490f843ec3bf 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -64,6 +64,7 @@ static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
 }
 
 static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
+		struct user_namespace *mnt_userns,
 		struct dentry *unused, struct inode *inode,
 		const char *name, const void *value,
 		size_t size, int flags)
@@ -107,6 +108,7 @@ static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
 }
 
 static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
+		struct user_namespace *mnt_userns,
 		struct dentry *unused, struct inode *inode,
 		const char *name, const void *value,
 		size_t size, int flags)
@@ -114,7 +116,7 @@ static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
 	unsigned char old_advise = F2FS_I(inode)->i_advise;
 	unsigned char new_advise;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EPERM;
 	if (value == NULL)
 		return -EINVAL;
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index 922a0c6ba46c..02d4d4234956 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -397,9 +397,11 @@ extern long fat_generic_ioctl(struct file *filp, unsigned int cmd,
 			      unsigned long arg);
 extern const struct file_operations fat_file_operations;
 extern const struct inode_operations fat_file_inode_operations;
-extern int fat_setattr(struct dentry *dentry, struct iattr *attr);
+extern int fat_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		       struct iattr *attr);
 extern void fat_truncate_blocks(struct inode *inode, loff_t offset);
-extern int fat_getattr(const struct path *path, struct kstat *stat,
+extern int fat_getattr(struct user_namespace *mnt_userns,
+		       const struct path *path, struct kstat *stat,
 		       u32 request_mask, unsigned int flags);
 extern int fat_file_fsync(struct file *file, loff_t start, loff_t end,
 			  int datasync);
diff --git a/fs/fat/file.c b/fs/fat/file.c
index 5fee74f1ad61..13855ba49cd9 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -95,7 +95,7 @@ static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
 		goto out_unlock_inode;
 
 	/* This MUST be done before doing anything irreversible... */
-	err = fat_setattr(file->f_path.dentry, &ia);
+	err = fat_setattr(file_mnt_user_ns(file), file->f_path.dentry, &ia);
 	if (err)
 		goto out_unlock_inode;
 
@@ -394,11 +394,11 @@ void fat_truncate_blocks(struct inode *inode, loff_t offset)
 	fat_flush_inodes(inode->i_sb, inode, NULL);
 }
 
-int fat_getattr(const struct path *path, struct kstat *stat,
-		u32 request_mask, unsigned int flags)
+int fat_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		struct kstat *stat, u32 request_mask, unsigned int flags)
 {
 	struct inode *inode = d_inode(path->dentry);
-	generic_fillattr(inode, stat);
+	generic_fillattr(mnt_userns, inode, stat);
 	stat->blksize = MSDOS_SB(inode->i_sb)->cluster_size;
 
 	if (MSDOS_SB(inode->i_sb)->options.nfs == FAT_NFS_NOSTALE_RO) {
@@ -447,12 +447,13 @@ static int fat_sanitize_mode(const struct msdos_sb_info *sbi,
 	return 0;
 }
 
-static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
+static int fat_allow_set_time(struct user_namespace *mnt_userns,
+			      struct msdos_sb_info *sbi, struct inode *inode)
 {
 	umode_t allow_utime = sbi->options.allow_utime;
 
-	if (!uid_eq(current_fsuid(), inode->i_uid)) {
-		if (in_group_p(inode->i_gid))
+	if (!uid_eq(current_fsuid(), i_uid_into_mnt(mnt_userns, inode))) {
+		if (in_group_p(i_gid_into_mnt(mnt_userns, inode)))
 			allow_utime >>= 3;
 		if (allow_utime & MAY_WRITE)
 			return 1;
@@ -466,7 +467,8 @@ static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
 /* valid file mode bits */
 #define FAT_VALID_MODE	(S_IFREG | S_IFDIR | S_IRWXUGO)
 
-int fat_setattr(struct dentry *dentry, struct iattr *attr)
+int fat_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		struct iattr *attr)
 {
 	struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
 	struct inode *inode = d_inode(dentry);
@@ -476,11 +478,11 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
 	/* Check for setting the inode time. */
 	ia_valid = attr->ia_valid;
 	if (ia_valid & TIMES_SET_FLAGS) {
-		if (fat_allow_set_time(sbi, inode))
+		if (fat_allow_set_time(mnt_userns, sbi, inode))
 			attr->ia_valid &= ~TIMES_SET_FLAGS;
 	}
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(mnt_userns, dentry, attr);
 	attr->ia_valid = ia_valid;
 	if (error) {
 		if (sbi->options.quiet)
@@ -550,7 +552,7 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
 		fat_truncate_time(inode, &attr->ia_mtime, S_MTIME);
 	attr->ia_valid &= ~(ATTR_ATIME|ATTR_CTIME|ATTR_MTIME);
 
-	setattr_copy(inode, attr);
+	setattr_copy(mnt_userns, inode, attr);
 	mark_inode_dirty(inode);
 out:
 	return error;
diff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c
index 9d062886fbc1..efba301d68ae 100644
--- a/fs/fat/namei_msdos.c
+++ b/fs/fat/namei_msdos.c
@@ -261,8 +261,8 @@ static int msdos_add_entry(struct inode *dir, const unsigned char *name,
 }
 
 /***** Create a file */
-static int msdos_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-			bool excl)
+static int msdos_create(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct super_block *sb = dir->i_sb;
 	struct inode *inode = NULL;
@@ -339,7 +339,8 @@ out:
 }
 
 /***** Make a directory */
-static int msdos_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int msdos_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode)
 {
 	struct super_block *sb = dir->i_sb;
 	struct fat_slot_info sinfo;
@@ -593,7 +594,8 @@ error_inode:
 }
 
 /***** Rename, a wrapper for rename_same_dir & rename_diff_dir */
-static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
+static int msdos_rename(struct user_namespace *mnt_userns,
+			struct inode *old_dir, struct dentry *old_dentry,
 			struct inode *new_dir, struct dentry *new_dentry,
 			unsigned int flags)
 {
@@ -665,7 +667,7 @@ static struct file_system_type msdos_fs_type = {
 	.name		= "msdos",
 	.mount		= msdos_mount,
 	.kill_sb	= kill_block_super,
-	.fs_flags	= FS_REQUIRES_DEV,
+	.fs_flags	= FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
 };
 MODULE_ALIAS_FS("msdos");
 
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 0cdd0fb9f742..5369d82e0bfb 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -756,8 +756,8 @@ error:
 	return ERR_PTR(err);
 }
 
-static int vfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		       bool excl)
+static int vfat_create(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct super_block *sb = dir->i_sb;
 	struct inode *inode;
@@ -846,7 +846,8 @@ out:
 	return err;
 }
 
-static int vfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int vfat_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode)
 {
 	struct super_block *sb = dir->i_sb;
 	struct inode *inode;
@@ -892,9 +893,9 @@ out:
 	return err;
 }
 
-static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
-		       struct inode *new_dir, struct dentry *new_dentry,
-		       unsigned int flags)
+static int vfat_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		       struct dentry *old_dentry, struct inode *new_dir,
+		       struct dentry *new_dentry, unsigned int flags)
 {
 	struct buffer_head *dotdot_bh;
 	struct msdos_dir_entry *dotdot_de;
@@ -1062,7 +1063,7 @@ static struct file_system_type vfat_fs_type = {
 	.name		= "vfat",
 	.mount		= vfat_mount,
 	.kill_sb	= kill_block_super,
-	.fs_flags	= FS_REQUIRES_DEV,
+	.fs_flags	= FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
 };
 MODULE_ALIAS_FS("vfat");
 
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 483ef8861376..dfc72f15be7f 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -25,6 +25,7 @@
 #include <linux/user_namespace.h>
 #include <linux/memfd.h>
 #include <linux/compat.h>
+#include <linux/mount.h>
 
 #include <linux/poll.h>
 #include <asm/siginfo.h>
@@ -46,7 +47,7 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
 
 	/* O_NOATIME can only be set by the owner or superuser */
 	if ((arg & O_NOATIME) && !(filp->f_flags & O_NOATIME))
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(file_mnt_user_ns(filp), inode))
 			return -EPERM;
 
 	/* required for strict SunOS emulation */
diff --git a/fs/fuse/acl.c b/fs/fuse/acl.c
index f529075a2ce8..e9c0f916349d 100644
--- a/fs/fuse/acl.c
+++ b/fs/fuse/acl.c
@@ -50,7 +50,8 @@ struct posix_acl *fuse_get_acl(struct inode *inode, int type)
 	return acl;
 }
 
-int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+int fuse_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		 struct posix_acl *acl, int type)
 {
 	struct fuse_conn *fc = get_fuse_conn(inode);
 	const char *name;
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 78f9f209078c..06a18700a845 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -605,7 +605,8 @@ out_err:
 	return err;
 }
 
-static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t);
+static int fuse_mknod(struct user_namespace *, struct inode *, struct dentry *,
+		      umode_t, dev_t);
 static int fuse_atomic_open(struct inode *dir, struct dentry *entry,
 			    struct file *file, unsigned flags,
 			    umode_t mode)
@@ -645,7 +646,7 @@ out_dput:
 	return err;
 
 mknod:
-	err = fuse_mknod(dir, entry, mode, 0);
+	err = fuse_mknod(&init_user_ns, dir, entry, mode, 0);
 	if (err)
 		goto out_dput;
 no_open:
@@ -715,8 +716,8 @@ static int create_new_entry(struct fuse_mount *fm, struct fuse_args *args,
 	return err;
 }
 
-static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
-		      dev_t rdev)
+static int fuse_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *entry, umode_t mode, dev_t rdev)
 {
 	struct fuse_mknod_in inarg;
 	struct fuse_mount *fm = get_fuse_mount(dir);
@@ -738,13 +739,14 @@ static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
 	return create_new_entry(fm, &args, dir, entry, mode);
 }
 
-static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
-		       bool excl)
+static int fuse_create(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *entry, umode_t mode, bool excl)
 {
-	return fuse_mknod(dir, entry, mode, 0);
+	return fuse_mknod(&init_user_ns, dir, entry, mode, 0);
 }
 
-static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
+static int fuse_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *entry, umode_t mode)
 {
 	struct fuse_mkdir_in inarg;
 	struct fuse_mount *fm = get_fuse_mount(dir);
@@ -765,8 +767,8 @@ static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
 	return create_new_entry(fm, &args, dir, entry, S_IFDIR);
 }
 
-static int fuse_symlink(struct inode *dir, struct dentry *entry,
-			const char *link)
+static int fuse_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *entry, const char *link)
 {
 	struct fuse_mount *fm = get_fuse_mount(dir);
 	unsigned len = strlen(link) + 1;
@@ -908,9 +910,9 @@ static int fuse_rename_common(struct inode *olddir, struct dentry *oldent,
 	return err;
 }
 
-static int fuse_rename2(struct inode *olddir, struct dentry *oldent,
-			struct inode *newdir, struct dentry *newent,
-			unsigned int flags)
+static int fuse_rename2(struct user_namespace *mnt_userns, struct inode *olddir,
+			struct dentry *oldent, struct inode *newdir,
+			struct dentry *newent, unsigned int flags)
 {
 	struct fuse_conn *fc = get_fuse_conn(olddir);
 	int err;
@@ -1087,7 +1089,7 @@ static int fuse_update_get_attr(struct inode *inode, struct file *file,
 		forget_all_cached_acls(inode);
 		err = fuse_do_getattr(inode, stat, file);
 	} else if (stat) {
-		generic_fillattr(inode, stat);
+		generic_fillattr(&init_user_ns, inode, stat);
 		stat->mode = fi->orig_i_mode;
 		stat->ino = fi->orig_ino;
 	}
@@ -1249,7 +1251,8 @@ static int fuse_perm_getattr(struct inode *inode, int mask)
  * access request is sent.  Execute permission is still checked
  * locally based on file mode.
  */
-static int fuse_permission(struct inode *inode, int mask)
+static int fuse_permission(struct user_namespace *mnt_userns,
+			   struct inode *inode, int mask)
 {
 	struct fuse_conn *fc = get_fuse_conn(inode);
 	bool refreshed = false;
@@ -1280,7 +1283,7 @@ static int fuse_permission(struct inode *inode, int mask)
 	}
 
 	if (fc->default_permissions) {
-		err = generic_permission(inode, mask);
+		err = generic_permission(&init_user_ns, inode, mask);
 
 		/* If permission is denied, try to refresh file
 		   attributes.  This is also needed, because the root
@@ -1288,7 +1291,8 @@ static int fuse_permission(struct inode *inode, int mask)
 		if (err == -EACCES && !refreshed) {
 			err = fuse_perm_getattr(inode, mask);
 			if (!err)
-				err = generic_permission(inode, mask);
+				err = generic_permission(&init_user_ns,
+							 inode, mask);
 		}
 
 		/* Note: the opposite of the above test does not
@@ -1610,7 +1614,7 @@ int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
 	if (!fc->default_permissions)
 		attr->ia_valid |= ATTR_FORCE;
 
-	err = setattr_prepare(dentry, attr);
+	err = setattr_prepare(&init_user_ns, dentry, attr);
 	if (err)
 		return err;
 
@@ -1756,7 +1760,8 @@ error:
 	return err;
 }
 
-static int fuse_setattr(struct dentry *entry, struct iattr *attr)
+static int fuse_setattr(struct user_namespace *mnt_userns, struct dentry *entry,
+			struct iattr *attr)
 {
 	struct inode *inode = d_inode(entry);
 	struct fuse_conn *fc = get_fuse_conn(inode);
@@ -1818,7 +1823,8 @@ static int fuse_setattr(struct dentry *entry, struct iattr *attr)
 	return ret;
 }
 
-static int fuse_getattr(const struct path *path, struct kstat *stat,
+static int fuse_getattr(struct user_namespace *mnt_userns,
+			const struct path *path, struct kstat *stat,
 			u32 request_mask, unsigned int flags)
 {
 	struct inode *inode = d_inode(path->dentry);
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 7c4b8cb93f9f..68cca8d4db6e 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1180,8 +1180,8 @@ extern const struct xattr_handler *fuse_no_acl_xattr_handlers[];
 
 struct posix_acl;
 struct posix_acl *fuse_get_acl(struct inode *inode, int type);
-int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type);
-
+int fuse_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		 struct posix_acl *acl, int type);
 
 /* readdir.c */
 int fuse_readdir(struct file *file, struct dir_context *ctx);
diff --git a/fs/fuse/xattr.c b/fs/fuse/xattr.c
index cdea18de94f7..1a7d7ace54e1 100644
--- a/fs/fuse/xattr.c
+++ b/fs/fuse/xattr.c
@@ -188,6 +188,7 @@ static int fuse_xattr_get(const struct xattr_handler *handler,
 }
 
 static int fuse_xattr_set(const struct xattr_handler *handler,
+			  struct user_namespace *mnt_userns,
 			  struct dentry *dentry, struct inode *inode,
 			  const char *name, const void *value, size_t size,
 			  int flags)
@@ -214,6 +215,7 @@ static int no_xattr_get(const struct xattr_handler *handler,
 }
 
 static int no_xattr_set(const struct xattr_handler *handler,
+			struct user_namespace *mnt_userns,
 			struct dentry *dentry, struct inode *nodee,
 			const char *name, const void *value,
 			size_t size, int flags)
diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index 2e939f5fe751..9165d70ead07 100644
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -106,7 +106,8 @@ out:
 	return error;
 }
 
-int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+int gfs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		 struct posix_acl *acl, int type)
 {
 	struct gfs2_inode *ip = GFS2_I(inode);
 	struct gfs2_holder gh;
@@ -130,7 +131,7 @@ int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 
 	mode = inode->i_mode;
 	if (type == ACL_TYPE_ACCESS && acl) {
-		ret = posix_acl_update_mode(inode, &mode, &acl);
+		ret = posix_acl_update_mode(&init_user_ns, inode, &mode, &acl);
 		if (ret)
 			goto unlock;
 	}
diff --git a/fs/gfs2/acl.h b/fs/gfs2/acl.h
index 61353a1501c5..eccc6a43326c 100644
--- a/fs/gfs2/acl.h
+++ b/fs/gfs2/acl.h
@@ -13,6 +13,7 @@
 
 extern struct posix_acl *gfs2_get_acl(struct inode *inode, int type);
 extern int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
-extern int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+extern int gfs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+			struct posix_acl *acl, int type);
 
 #endif /* __ACL_DOT_H__ */
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 07f49e5e6304..95bbdd4bca78 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -238,7 +238,7 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask,
 		goto out;
 
 	error = -EACCES;
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		goto out;
 
 	error = 0;
@@ -256,7 +256,7 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask,
 	    !capable(CAP_LINUX_IMMUTABLE))
 		goto out;
 	if (!IS_IMMUTABLE(inode)) {
-		error = gfs2_permission(inode, MAY_WRITE);
+		error = gfs2_permission(&init_user_ns, inode, MAY_WRITE);
 		if (error)
 			goto out;
 	}
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index c1b77e8d6b1c..cfac2c1e67fa 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -325,7 +325,7 @@ struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
 	}
 
 	if (!is_root) {
-		error = gfs2_permission(dir, MAY_EXEC);
+		error = gfs2_permission(&init_user_ns, dir, MAY_EXEC);
 		if (error)
 			goto out;
 	}
@@ -355,7 +355,8 @@ static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
 {
 	int error;
 
-	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
+	error = gfs2_permission(&init_user_ns, &dip->i_inode,
+				MAY_WRITE | MAY_EXEC);
 	if (error)
 		return error;
 
@@ -843,8 +844,8 @@ fail:
  * Returns: errno
  */
 
-static int gfs2_create(struct inode *dir, struct dentry *dentry,
-		       umode_t mode, bool excl)
+static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, bool excl)
 {
 	return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
 }
@@ -951,7 +952,7 @@ static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 	if (inode->i_nlink == 0)
 		goto out_gunlock;
 
-	error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
+	error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
 	if (error)
 		goto out_gunlock;
 
@@ -1068,7 +1069,8 @@ static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
 	if (IS_APPEND(&dip->i_inode))
 		return -EPERM;
 
-	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
+	error = gfs2_permission(&init_user_ns, &dip->i_inode,
+				MAY_WRITE | MAY_EXEC);
 	if (error)
 		return error;
 
@@ -1204,8 +1206,8 @@ out_inodes:
  * Returns: errno
  */
 
-static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
-			const char *symname)
+static int gfs2_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, const char *symname)
 {
 	unsigned int size;
 
@@ -1225,7 +1227,8 @@ static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
  * Returns: errno
  */
 
-static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int gfs2_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode)
 {
 	unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
 	return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
@@ -1240,8 +1243,8 @@ static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
  *
  */
 
-static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
-		      dev_t dev)
+static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, dev_t dev)
 {
 	return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
 }
@@ -1490,7 +1493,8 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 			}
 		}
 	} else {
-		error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
+		error = gfs2_permission(&init_user_ns, ndir,
+					MAY_WRITE | MAY_EXEC);
 		if (error)
 			goto out_gunlock;
 
@@ -1525,7 +1529,8 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 	/* Check out the dir to be renamed */
 
 	if (dir_rename) {
-		error = gfs2_permission(d_inode(odentry), MAY_WRITE);
+		error = gfs2_permission(&init_user_ns, d_inode(odentry),
+					MAY_WRITE);
 		if (error)
 			goto out_gunlock;
 	}
@@ -1688,12 +1693,14 @@ static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
 		goto out_gunlock;
 
 	if (S_ISDIR(old_mode)) {
-		error = gfs2_permission(odentry->d_inode, MAY_WRITE);
+		error = gfs2_permission(&init_user_ns, odentry->d_inode,
+					MAY_WRITE);
 		if (error)
 			goto out_gunlock;
 	}
 	if (S_ISDIR(new_mode)) {
-		error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
+		error = gfs2_permission(&init_user_ns, ndentry->d_inode,
+					MAY_WRITE);
 		if (error)
 			goto out_gunlock;
 	}
@@ -1747,9 +1754,9 @@ out:
 	return error;
 }
 
-static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
-			struct inode *ndir, struct dentry *ndentry,
-			unsigned int flags)
+static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir,
+			struct dentry *odentry, struct inode *ndir,
+			struct dentry *ndentry, unsigned int flags)
 {
 	flags &= ~RENAME_NOREPLACE;
 
@@ -1833,7 +1840,8 @@ out:
  * Returns: errno
  */
 
-int gfs2_permission(struct inode *inode, int mask)
+int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		    int mask)
 {
 	struct gfs2_inode *ip;
 	struct gfs2_holder i_gh;
@@ -1852,7 +1860,7 @@ int gfs2_permission(struct inode *inode, int mask)
 	if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
 		error = -EPERM;
 	else
-		error = generic_permission(inode, mask);
+		error = generic_permission(&init_user_ns, inode, mask);
 	if (gfs2_holder_initialized(&i_gh))
 		gfs2_glock_dq_uninit(&i_gh);
 
@@ -1861,7 +1869,7 @@ int gfs2_permission(struct inode *inode, int mask)
 
 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
 {
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
@@ -1963,7 +1971,8 @@ out:
  * Returns: errno
  */
 
-static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
+static int gfs2_setattr(struct user_namespace *mnt_userns,
+			struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct gfs2_inode *ip = GFS2_I(inode);
@@ -1982,7 +1991,7 @@ static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
 	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 		goto error;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		goto error;
 
@@ -1993,7 +2002,8 @@ static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
 	else {
 		error = gfs2_setattr_simple(inode, attr);
 		if (!error && attr->ia_valid & ATTR_MODE)
-			error = posix_acl_chmod(inode, inode->i_mode);
+			error = posix_acl_chmod(&init_user_ns, inode,
+						inode->i_mode);
 	}
 
 error:
@@ -2007,6 +2017,7 @@ out:
 
 /**
  * gfs2_getattr - Read out an inode's attributes
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @path: Object to query
  * @stat: The inode's stats
  * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
@@ -2021,7 +2032,8 @@ out:
  * Returns: errno
  */
 
-static int gfs2_getattr(const struct path *path, struct kstat *stat,
+static int gfs2_getattr(struct user_namespace *mnt_userns,
+			const struct path *path, struct kstat *stat,
 			u32 request_mask, unsigned int flags)
 {
 	struct inode *inode = d_inode(path->dentry);
@@ -2049,7 +2061,7 @@ static int gfs2_getattr(const struct path *path, struct kstat *stat,
 				  STATX_ATTR_IMMUTABLE |
 				  STATX_ATTR_NODUMP);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 
 	if (gfs2_holder_initialized(&gh))
 		gfs2_glock_dq_uninit(&gh);
diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index 8073b8d2c7fa..c447bd5b3017 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -99,7 +99,8 @@ extern int gfs2_inode_refresh(struct gfs2_inode *ip);
 
 extern struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
 				  int is_root);
-extern int gfs2_permission(struct inode *inode, int mask);
+extern int gfs2_permission(struct user_namespace *mnt_userns,
+			   struct inode *inode, int mask);
 extern int gfs2_setattr_simple(struct inode *inode, struct iattr *attr);
 extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
 extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
diff --git a/fs/gfs2/xattr.c b/fs/gfs2/xattr.c
index 9d7667bc4292..13969a813410 100644
--- a/fs/gfs2/xattr.c
+++ b/fs/gfs2/xattr.c
@@ -1214,6 +1214,7 @@ int __gfs2_xattr_set(struct inode *inode, const char *name,
 }
 
 static int gfs2_xattr_set(const struct xattr_handler *handler,
+			  struct user_namespace *mnt_userns,
 			  struct dentry *unused, struct inode *inode,
 			  const char *name, const void *value,
 			  size_t size, int flags)
diff --git a/fs/hfs/attr.c b/fs/hfs/attr.c
index 74fa62643136..2bd54efaf416 100644
--- a/fs/hfs/attr.c
+++ b/fs/hfs/attr.c
@@ -121,6 +121,7 @@ static int hfs_xattr_get(const struct xattr_handler *handler,
 }
 
 static int hfs_xattr_set(const struct xattr_handler *handler,
+			 struct user_namespace *mnt_userns,
 			 struct dentry *unused, struct inode *inode,
 			 const char *name, const void *value, size_t size,
 			 int flags)
diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index 3bf2ae0e467c..527f6e46cbe8 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -189,8 +189,8 @@ static int hfs_dir_release(struct inode *inode, struct file *file)
  * a directory and return a corresponding inode, given the inode for
  * the directory and the name (and its length) of the new file.
  */
-static int hfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		      bool excl)
+static int hfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct inode *inode;
 	int res;
@@ -219,7 +219,8 @@ static int hfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
  * in a directory, given the inode for the parent directory and the
  * name (and its length) of the new directory.
  */
-static int hfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int hfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, umode_t mode)
 {
 	struct inode *inode;
 	int res;
@@ -279,9 +280,9 @@ static int hfs_remove(struct inode *dir, struct dentry *dentry)
  * new file/directory.
  * XXX: how do you handle must_be dir?
  */
-static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
-		      struct inode *new_dir, struct dentry *new_dentry,
-		      unsigned int flags)
+static int hfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		      struct dentry *old_dentry, struct inode *new_dir,
+		      struct dentry *new_dentry, unsigned int flags)
 {
 	int res;
 
diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index f71c384064c8..b8eb0322a3e5 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -204,7 +204,8 @@ extern const struct address_space_operations hfs_btree_aops;
 extern struct inode *hfs_new_inode(struct inode *, const struct qstr *, umode_t);
 extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
 extern int hfs_write_inode(struct inode *, struct writeback_control *);
-extern int hfs_inode_setattr(struct dentry *, struct iattr *);
+extern int hfs_inode_setattr(struct user_namespace *, struct dentry *,
+			     struct iattr *);
 extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
 			__be32 log_size, __be32 phys_size, u32 clump_size);
 extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index f35a37c65e5f..3fc5cb346586 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -602,13 +602,15 @@ static int hfs_file_release(struct inode *inode, struct file *file)
  *     correspond to the same HFS file.
  */
 
-int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
+int hfs_inode_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		      struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
 	int error;
 
-	error = setattr_prepare(dentry, attr); /* basic permission checks */
+	error = setattr_prepare(&init_user_ns, dentry,
+				attr); /* basic permission checks */
 	if (error)
 		return error;
 
@@ -647,7 +649,7 @@ int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
 						  current_time(inode);
 	}
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
index 29a9dcfbe81f..03e6c046faf4 100644
--- a/fs/hfsplus/dir.c
+++ b/fs/hfsplus/dir.c
@@ -434,8 +434,8 @@ out:
 	return res;
 }
 
-static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
-			   const char *symname)
+static int hfsplus_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			   struct dentry *dentry, const char *symname)
 {
 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
 	struct inode *inode;
@@ -476,8 +476,8 @@ out:
 	return res;
 }
 
-static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
-			 umode_t mode, dev_t rdev)
+static int hfsplus_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+			 struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
 	struct inode *inode;
@@ -517,18 +517,20 @@ out:
 	return res;
 }
 
-static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-			  bool excl)
+static int hfsplus_create(struct user_namespace *mnt_userns, struct inode *dir,
+			  struct dentry *dentry, umode_t mode, bool excl)
 {
-	return hfsplus_mknod(dir, dentry, mode, 0);
+	return hfsplus_mknod(&init_user_ns, dir, dentry, mode, 0);
 }
 
-static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int hfsplus_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+			 struct dentry *dentry, umode_t mode)
 {
-	return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0);
+	return hfsplus_mknod(&init_user_ns, dir, dentry, mode | S_IFDIR, 0);
 }
 
-static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry,
+static int hfsplus_rename(struct user_namespace *mnt_userns,
+			  struct inode *old_dir, struct dentry *old_dentry,
 			  struct inode *new_dir, struct dentry *new_dentry,
 			  unsigned int flags)
 {
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index a92de5199ec3..12b20479ed2b 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -488,8 +488,9 @@ void hfsplus_inode_write_fork(struct inode *inode,
 			      struct hfsplus_fork_raw *fork);
 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd);
 int hfsplus_cat_write_inode(struct inode *inode);
-int hfsplus_getattr(const struct path *path, struct kstat *stat,
-		    u32 request_mask, unsigned int query_flags);
+int hfsplus_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		    struct kstat *stat, u32 request_mask,
+		    unsigned int query_flags);
 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
 		       int datasync);
 
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index ca464328b79c..078c5c8a5156 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -241,12 +241,13 @@ static int hfsplus_file_release(struct inode *inode, struct file *file)
 	return 0;
 }
 
-static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
+static int hfsplus_setattr(struct user_namespace *mnt_userns,
+			   struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		return error;
 
@@ -264,14 +265,15 @@ static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
 		inode->i_mtime = inode->i_ctime = current_time(inode);
 	}
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 
 	return 0;
 }
 
-int hfsplus_getattr(const struct path *path, struct kstat *stat,
-		    u32 request_mask, unsigned int query_flags)
+int hfsplus_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		    struct kstat *stat, u32 request_mask,
+		    unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
@@ -286,7 +288,7 @@ int hfsplus_getattr(const struct path *path, struct kstat *stat,
 	stat->attributes_mask |= STATX_ATTR_APPEND | STATX_ATTR_IMMUTABLE |
 				 STATX_ATTR_NODUMP;
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	return 0;
 }
 
@@ -376,7 +378,7 @@ struct inode *hfsplus_new_inode(struct super_block *sb, struct inode *dir,
 		return NULL;
 
 	inode->i_ino = sbi->next_cnid++;
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 	set_nlink(inode, 1);
 	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 
diff --git a/fs/hfsplus/ioctl.c b/fs/hfsplus/ioctl.c
index ce15b9496b77..3edb1926d127 100644
--- a/fs/hfsplus/ioctl.c
+++ b/fs/hfsplus/ioctl.c
@@ -91,7 +91,7 @@ static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags)
 	if (err)
 		goto out;
 
-	if (!inode_owner_or_capable(inode)) {
+	if (!inode_owner_or_capable(&init_user_ns, inode)) {
 		err = -EACCES;
 		goto out_drop_write;
 	}
diff --git a/fs/hfsplus/xattr.c b/fs/hfsplus/xattr.c
index bb0b27d88e50..4d169c5a2673 100644
--- a/fs/hfsplus/xattr.c
+++ b/fs/hfsplus/xattr.c
@@ -858,6 +858,7 @@ static int hfsplus_osx_getxattr(const struct xattr_handler *handler,
 }
 
 static int hfsplus_osx_setxattr(const struct xattr_handler *handler,
+				struct user_namespace *mnt_userns,
 				struct dentry *unused, struct inode *inode,
 				const char *name, const void *buffer,
 				size_t size, int flags)
diff --git a/fs/hfsplus/xattr_security.c b/fs/hfsplus/xattr_security.c
index cfbe6a3bfb1e..c1c7a16cbf21 100644
--- a/fs/hfsplus/xattr_security.c
+++ b/fs/hfsplus/xattr_security.c
@@ -23,6 +23,7 @@ static int hfsplus_security_getxattr(const struct xattr_handler *handler,
 }
 
 static int hfsplus_security_setxattr(const struct xattr_handler *handler,
+				     struct user_namespace *mnt_userns,
 				     struct dentry *unused, struct inode *inode,
 				     const char *name, const void *buffer,
 				     size_t size, int flags)
diff --git a/fs/hfsplus/xattr_trusted.c b/fs/hfsplus/xattr_trusted.c
index fbad91e1dada..e150372ec564 100644
--- a/fs/hfsplus/xattr_trusted.c
+++ b/fs/hfsplus/xattr_trusted.c
@@ -22,6 +22,7 @@ static int hfsplus_trusted_getxattr(const struct xattr_handler *handler,
 }
 
 static int hfsplus_trusted_setxattr(const struct xattr_handler *handler,
+				    struct user_namespace *mnt_userns,
 				    struct dentry *unused, struct inode *inode,
 				    const char *name, const void *buffer,
 				    size_t size, int flags)
diff --git a/fs/hfsplus/xattr_user.c b/fs/hfsplus/xattr_user.c
index 74d19faf255e..a6b60b153916 100644
--- a/fs/hfsplus/xattr_user.c
+++ b/fs/hfsplus/xattr_user.c
@@ -22,6 +22,7 @@ static int hfsplus_user_getxattr(const struct xattr_handler *handler,
 }
 
 static int hfsplus_user_setxattr(const struct xattr_handler *handler,
+				 struct user_namespace *mnt_userns,
 				 struct dentry *unused, struct inode *inode,
 				 const char *name, const void *buffer,
 				 size_t size, int flags)
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 4a5beca6eaa8..29e407762626 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -557,8 +557,8 @@ static int read_name(struct inode *ino, char *name)
 	return 0;
 }
 
-static int hostfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-			 bool excl)
+static int hostfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+			 struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct inode *inode;
 	char *name;
@@ -656,8 +656,8 @@ static int hostfs_unlink(struct inode *ino, struct dentry *dentry)
 	return err;
 }
 
-static int hostfs_symlink(struct inode *ino, struct dentry *dentry,
-			  const char *to)
+static int hostfs_symlink(struct user_namespace *mnt_userns, struct inode *ino,
+			  struct dentry *dentry, const char *to)
 {
 	char *file;
 	int err;
@@ -669,7 +669,8 @@ static int hostfs_symlink(struct inode *ino, struct dentry *dentry,
 	return err;
 }
 
-static int hostfs_mkdir(struct inode *ino, struct dentry *dentry, umode_t mode)
+static int hostfs_mkdir(struct user_namespace *mnt_userns, struct inode *ino,
+			struct dentry *dentry, umode_t mode)
 {
 	char *file;
 	int err;
@@ -693,7 +694,8 @@ static int hostfs_rmdir(struct inode *ino, struct dentry *dentry)
 	return err;
 }
 
-static int hostfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
+static int hostfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode, dev_t dev)
 {
 	struct inode *inode;
 	char *name;
@@ -731,7 +733,8 @@ static int hostfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 	return err;
 }
 
-static int hostfs_rename2(struct inode *old_dir, struct dentry *old_dentry,
+static int hostfs_rename2(struct user_namespace *mnt_userns,
+			  struct inode *old_dir, struct dentry *old_dentry,
 			  struct inode *new_dir, struct dentry *new_dentry,
 			  unsigned int flags)
 {
@@ -759,7 +762,8 @@ static int hostfs_rename2(struct inode *old_dir, struct dentry *old_dentry,
 	return err;
 }
 
-static int hostfs_permission(struct inode *ino, int desired)
+static int hostfs_permission(struct user_namespace *mnt_userns,
+			     struct inode *ino, int desired)
 {
 	char *name;
 	int r = 0, w = 0, x = 0, err;
@@ -781,11 +785,12 @@ static int hostfs_permission(struct inode *ino, int desired)
 		err = access_file(name, r, w, x);
 	__putname(name);
 	if (!err)
-		err = generic_permission(ino, desired);
+		err = generic_permission(&init_user_ns, ino, desired);
 	return err;
 }
 
-static int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
+static int hostfs_setattr(struct user_namespace *mnt_userns,
+			  struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct hostfs_iattr attrs;
@@ -794,7 +799,7 @@ static int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
 
 	int fd = HOSTFS_I(inode)->fd;
 
-	err = setattr_prepare(dentry, attr);
+	err = setattr_prepare(&init_user_ns, dentry, attr);
 	if (err)
 		return err;
 
@@ -851,7 +856,7 @@ static int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
 	    attr->ia_size != i_size_read(inode))
 		truncate_setsize(inode, attr->ia_size);
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
diff --git a/fs/hpfs/hpfs_fn.h b/fs/hpfs/hpfs_fn.h
index 1cca83218fb5..167ec6884642 100644
--- a/fs/hpfs/hpfs_fn.h
+++ b/fs/hpfs/hpfs_fn.h
@@ -280,7 +280,7 @@ void hpfs_init_inode(struct inode *);
 void hpfs_read_inode(struct inode *);
 void hpfs_write_inode(struct inode *);
 void hpfs_write_inode_nolock(struct inode *);
-int hpfs_setattr(struct dentry *, struct iattr *);
+int hpfs_setattr(struct user_namespace *, struct dentry *, struct iattr *);
 void hpfs_write_if_changed(struct inode *);
 void hpfs_evict_inode(struct inode *);
 
diff --git a/fs/hpfs/inode.c b/fs/hpfs/inode.c
index eb8b4baf0f2e..82208cc28ebd 100644
--- a/fs/hpfs/inode.c
+++ b/fs/hpfs/inode.c
@@ -257,7 +257,8 @@ void hpfs_write_inode_nolock(struct inode *i)
 	brelse(bh);
 }
 
-int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
+int hpfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		 struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error = -EINVAL;
@@ -274,7 +275,7 @@ int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
 	if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
 		goto out_unlock;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		goto out_unlock;
 
@@ -288,7 +289,7 @@ int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
 		hpfs_truncate(inode);
 	}
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 
 	hpfs_write_inode(inode);
 
diff --git a/fs/hpfs/namei.c b/fs/hpfs/namei.c
index 1aee39160ac5..d73f8a67168e 100644
--- a/fs/hpfs/namei.c
+++ b/fs/hpfs/namei.c
@@ -20,7 +20,8 @@ static void hpfs_update_directory_times(struct inode *dir)
 	hpfs_write_inode_nolock(dir);
 }
 
-static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int hpfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode)
 {
 	const unsigned char *name = dentry->d_name.name;
 	unsigned len = dentry->d_name.len;
@@ -128,7 +129,8 @@ bail:
 	return err;
 }
 
-static int hpfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
+static int hpfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, bool excl)
 {
 	const unsigned char *name = dentry->d_name.name;
 	unsigned len = dentry->d_name.len;
@@ -215,7 +217,8 @@ bail:
 	return err;
 }
 
-static int hpfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
+static int hpfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	const unsigned char *name = dentry->d_name.name;
 	unsigned len = dentry->d_name.len;
@@ -289,7 +292,8 @@ bail:
 	return err;
 }
 
-static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *symlink)
+static int hpfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, const char *symlink)
 {
 	const unsigned char *name = dentry->d_name.name;
 	unsigned len = dentry->d_name.len;
@@ -506,10 +510,10 @@ fail:
 const struct address_space_operations hpfs_symlink_aops = {
 	.readpage	= hpfs_symlink_readpage
 };
-	
-static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry,
-		       struct inode *new_dir, struct dentry *new_dentry,
-		       unsigned int flags)
+
+static int hpfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		       struct dentry *old_dentry, struct inode *new_dir,
+		       struct dentry *new_dentry, unsigned int flags)
 {
 	const unsigned char *old_name = old_dentry->d_name.name;
 	unsigned old_len = old_dentry->d_name.len;
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 21c20fd5f9ee..b7a72f577aab 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -752,7 +752,8 @@ out:
 	return error;
 }
 
-static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr)
+static int hugetlbfs_setattr(struct user_namespace *mnt_userns,
+			     struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct hstate *h = hstate_inode(inode);
@@ -762,7 +763,7 @@ static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr)
 
 	BUG_ON(!inode);
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		return error;
 
@@ -781,7 +782,7 @@ static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr)
 			return error;
 	}
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
@@ -837,7 +838,7 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb,
 		struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode);
 
 		inode->i_ino = get_next_ino();
-		inode_init_owner(inode, dir, mode);
+		inode_init_owner(&init_user_ns, inode, dir, mode);
 		lockdep_set_class(&inode->i_mapping->i_mmap_rwsem,
 				&hugetlbfs_i_mmap_rwsem_key);
 		inode->i_mapping->a_ops = &hugetlbfs_aops;
@@ -899,33 +900,39 @@ static int do_hugetlbfs_mknod(struct inode *dir,
 	return error;
 }
 
-static int hugetlbfs_mknod(struct inode *dir,
-			struct dentry *dentry, umode_t mode, dev_t dev)
+static int hugetlbfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+			   struct dentry *dentry, umode_t mode, dev_t dev)
 {
 	return do_hugetlbfs_mknod(dir, dentry, mode, dev, false);
 }
 
-static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int hugetlbfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+			   struct dentry *dentry, umode_t mode)
 {
-	int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0);
+	int retval = hugetlbfs_mknod(&init_user_ns, dir, dentry,
+				     mode | S_IFDIR, 0);
 	if (!retval)
 		inc_nlink(dir);
 	return retval;
 }
 
-static int hugetlbfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
+static int hugetlbfs_create(struct user_namespace *mnt_userns,
+			    struct inode *dir, struct dentry *dentry,
+			    umode_t mode, bool excl)
 {
-	return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0);
+	return hugetlbfs_mknod(&init_user_ns, dir, dentry, mode | S_IFREG, 0);
 }
 
-static int hugetlbfs_tmpfile(struct inode *dir,
-			struct dentry *dentry, umode_t mode)
+static int hugetlbfs_tmpfile(struct user_namespace *mnt_userns,
+			     struct inode *dir, struct dentry *dentry,
+			     umode_t mode)
 {
 	return do_hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0, true);
 }
 
-static int hugetlbfs_symlink(struct inode *dir,
-			struct dentry *dentry, const char *symname)
+static int hugetlbfs_symlink(struct user_namespace *mnt_userns,
+			     struct inode *dir, struct dentry *dentry,
+			     const char *symname)
 {
 	struct inode *inode;
 	int error = -ENOSPC;
diff --git a/fs/init.c b/fs/init.c
index e9c320a48cf1..5c36adaa9b44 100644
--- a/fs/init.c
+++ b/fs/init.c
@@ -49,7 +49,7 @@ int __init init_chdir(const char *filename)
 	error = kern_path(filename, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
 	if (error)
 		return error;
-	error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
+	error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
 	if (!error)
 		set_fs_pwd(current->fs, &path);
 	path_put(&path);
@@ -64,7 +64,7 @@ int __init init_chroot(const char *filename)
 	error = kern_path(filename, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
 	if (error)
 		return error;
-	error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
+	error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
 	if (error)
 		goto dput_and_out;
 	error = -EPERM;
@@ -118,7 +118,7 @@ int __init init_eaccess(const char *filename)
 	error = kern_path(filename, LOOKUP_FOLLOW, &path);
 	if (error)
 		return error;
-	error = inode_permission(d_inode(path.dentry), MAY_ACCESS);
+	error = path_permission(&path, MAY_ACCESS);
 	path_put(&path);
 	return error;
 }
@@ -157,8 +157,8 @@ int __init init_mknod(const char *filename, umode_t mode, unsigned int dev)
 		mode &= ~current_umask();
 	error = security_path_mknod(&path, dentry, mode, dev);
 	if (!error)
-		error = vfs_mknod(path.dentry->d_inode, dentry, mode,
-				  new_decode_dev(dev));
+		error = vfs_mknod(mnt_user_ns(path.mnt), path.dentry->d_inode,
+				  dentry, mode, new_decode_dev(dev));
 	done_path_create(&path, dentry);
 	return error;
 }
@@ -167,6 +167,7 @@ int __init init_link(const char *oldname, const char *newname)
 {
 	struct dentry *new_dentry;
 	struct path old_path, new_path;
+	struct user_namespace *mnt_userns;
 	int error;
 
 	error = kern_path(oldname, 0, &old_path);
@@ -181,14 +182,15 @@ int __init init_link(const char *oldname, const char *newname)
 	error = -EXDEV;
 	if (old_path.mnt != new_path.mnt)
 		goto out_dput;
-	error = may_linkat(&old_path);
+	mnt_userns = mnt_user_ns(new_path.mnt);
+	error = may_linkat(mnt_userns, &old_path);
 	if (unlikely(error))
 		goto out_dput;
 	error = security_path_link(old_path.dentry, &new_path, new_dentry);
 	if (error)
 		goto out_dput;
-	error = vfs_link(old_path.dentry, new_path.dentry->d_inode, new_dentry,
-			 NULL);
+	error = vfs_link(old_path.dentry, mnt_userns, new_path.dentry->d_inode,
+			 new_dentry, NULL);
 out_dput:
 	done_path_create(&new_path, new_dentry);
 out:
@@ -207,7 +209,8 @@ int __init init_symlink(const char *oldname, const char *newname)
 		return PTR_ERR(dentry);
 	error = security_path_symlink(&path, dentry, oldname);
 	if (!error)
-		error = vfs_symlink(path.dentry->d_inode, dentry, oldname);
+		error = vfs_symlink(mnt_user_ns(path.mnt), path.dentry->d_inode,
+				    dentry, oldname);
 	done_path_create(&path, dentry);
 	return error;
 }
@@ -230,7 +233,8 @@ int __init init_mkdir(const char *pathname, umode_t mode)
 		mode &= ~current_umask();
 	error = security_path_mkdir(&path, dentry, mode);
 	if (!error)
-		error = vfs_mkdir(path.dentry->d_inode, dentry, mode);
+		error = vfs_mkdir(mnt_user_ns(path.mnt), path.dentry->d_inode,
+				  dentry, mode);
 	done_path_create(&path, dentry);
 	return error;
 }
diff --git a/fs/inode.c b/fs/inode.c
index 874242169547..6dba963d3f6d 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1798,7 +1798,7 @@ bool atime_needs_update(const struct path *path, struct inode *inode)
 	/* Atime updates will likely cause i_uid and i_gid to be written
 	 * back improprely if their true value is unknown to the vfs.
 	 */
-	if (HAS_UNMAPPED_ID(inode))
+	if (HAS_UNMAPPED_ID(mnt_user_ns(mnt), inode))
 		return false;
 
 	if (IS_NOATIME(inode))
@@ -1905,7 +1905,8 @@ int dentry_needs_remove_privs(struct dentry *dentry)
 	return mask;
 }
 
-static int __remove_privs(struct dentry *dentry, int kill)
+static int __remove_privs(struct user_namespace *mnt_userns,
+			  struct dentry *dentry, int kill)
 {
 	struct iattr newattrs;
 
@@ -1914,7 +1915,7 @@ static int __remove_privs(struct dentry *dentry, int kill)
 	 * Note we call this on write, so notify_change will not
 	 * encounter any conflicting delegations:
 	 */
-	return notify_change(dentry, &newattrs, NULL);
+	return notify_change(mnt_userns, dentry, &newattrs, NULL);
 }
 
 /*
@@ -1941,7 +1942,7 @@ int file_remove_privs(struct file *file)
 	if (kill < 0)
 		return kill;
 	if (kill)
-		error = __remove_privs(dentry, kill);
+		error = __remove_privs(file_mnt_user_ns(file), dentry, kill);
 	if (!error)
 		inode_has_no_xattr(inode);
 
@@ -2132,14 +2133,21 @@ EXPORT_SYMBOL(init_special_inode);
 
 /**
  * inode_init_owner - Init uid,gid,mode for new inode according to posix standards
+ * @mnt_userns:	User namespace of the mount the inode was created from
  * @inode: New inode
  * @dir: Directory inode
  * @mode: mode of the new inode
+ *
+ * If the inode has been created through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions
+ * and initializing i_uid and i_gid. On non-idmapped mounts or if permission
+ * checking is to be performed on the raw inode simply passs init_user_ns.
  */
-void inode_init_owner(struct inode *inode, const struct inode *dir,
-			umode_t mode)
+void inode_init_owner(struct user_namespace *mnt_userns, struct inode *inode,
+		      const struct inode *dir, umode_t mode)
 {
-	inode->i_uid = current_fsuid();
+	inode->i_uid = fsuid_into_mnt(mnt_userns);
 	if (dir && dir->i_mode & S_ISGID) {
 		inode->i_gid = dir->i_gid;
 
@@ -2147,31 +2155,41 @@ void inode_init_owner(struct inode *inode, const struct inode *dir,
 		if (S_ISDIR(mode))
 			mode |= S_ISGID;
 		else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
-			 !in_group_p(inode->i_gid) &&
-			 !capable_wrt_inode_uidgid(dir, CAP_FSETID))
+			 !in_group_p(i_gid_into_mnt(mnt_userns, dir)) &&
+			 !capable_wrt_inode_uidgid(mnt_userns, dir, CAP_FSETID))
 			mode &= ~S_ISGID;
 	} else
-		inode->i_gid = current_fsgid();
+		inode->i_gid = fsgid_into_mnt(mnt_userns);
 	inode->i_mode = mode;
 }
 EXPORT_SYMBOL(inode_init_owner);
 
 /**
  * inode_owner_or_capable - check current task permissions to inode
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @inode: inode being checked
  *
  * Return true if current either has CAP_FOWNER in a namespace with the
  * inode owner uid mapped, or owns the file.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
  */
-bool inode_owner_or_capable(const struct inode *inode)
+bool inode_owner_or_capable(struct user_namespace *mnt_userns,
+			    const struct inode *inode)
 {
+	kuid_t i_uid;
 	struct user_namespace *ns;
 
-	if (uid_eq(current_fsuid(), inode->i_uid))
+	i_uid = i_uid_into_mnt(mnt_userns, inode);
+	if (uid_eq(current_fsuid(), i_uid))
 		return true;
 
 	ns = current_user_ns();
-	if (kuid_has_mapping(ns, inode->i_uid) && ns_capable(ns, CAP_FOWNER))
+	if (kuid_has_mapping(ns, i_uid) && ns_capable(ns, CAP_FOWNER))
 		return true;
 	return false;
 }
diff --git a/fs/internal.h b/fs/internal.h
index 49bfb3750b22..6aeae7ef3380 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -74,7 +74,7 @@ extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
 			   const char *, unsigned int, struct path *);
 long do_rmdir(int dfd, struct filename *name);
 long do_unlinkat(int dfd, struct filename *name);
-int may_linkat(struct path *link);
+int may_linkat(struct user_namespace *mnt_userns, struct path *link);
 int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
 		 struct filename *newname, unsigned int flags);
 
diff --git a/fs/jffs2/acl.c b/fs/jffs2/acl.c
index 093ffbd82395..55a79df70d24 100644
--- a/fs/jffs2/acl.c
+++ b/fs/jffs2/acl.c
@@ -226,7 +226,8 @@ static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *a
 	return rc;
 }
 
-int jffs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+int jffs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		  struct posix_acl *acl, int type)
 {
 	int rc, xprefix;
 
@@ -236,7 +237,8 @@ int jffs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 		if (acl) {
 			umode_t mode;
 
-			rc = posix_acl_update_mode(inode, &mode, &acl);
+			rc = posix_acl_update_mode(&init_user_ns, inode, &mode,
+						   &acl);
 			if (rc)
 				return rc;
 			if (inode->i_mode != mode) {
diff --git a/fs/jffs2/acl.h b/fs/jffs2/acl.h
index 12d0271bdde3..62c50da9d493 100644
--- a/fs/jffs2/acl.h
+++ b/fs/jffs2/acl.h
@@ -28,7 +28,8 @@ struct jffs2_acl_header {
 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
 
 struct posix_acl *jffs2_get_acl(struct inode *inode, int type);
-int jffs2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+int jffs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		  struct posix_acl *acl, int type);
 extern int jffs2_init_acl_pre(struct inode *, struct inode *, umode_t *);
 extern int jffs2_init_acl_post(struct inode *);
 
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 776493713153..c0aabbcbfd58 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -24,18 +24,21 @@
 
 static int jffs2_readdir (struct file *, struct dir_context *);
 
-static int jffs2_create (struct inode *,struct dentry *,umode_t,
-			 bool);
+static int jffs2_create (struct user_namespace *, struct inode *,
+		         struct dentry *, umode_t, bool);
 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
 				    unsigned int);
 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
 static int jffs2_unlink (struct inode *,struct dentry *);
-static int jffs2_symlink (struct inode *,struct dentry *,const char *);
-static int jffs2_mkdir (struct inode *,struct dentry *,umode_t);
+static int jffs2_symlink (struct user_namespace *, struct inode *,
+			  struct dentry *, const char *);
+static int jffs2_mkdir (struct user_namespace *, struct inode *,struct dentry *,
+			umode_t);
 static int jffs2_rmdir (struct inode *,struct dentry *);
-static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
-static int jffs2_rename (struct inode *, struct dentry *,
-			 struct inode *, struct dentry *,
+static int jffs2_mknod (struct user_namespace *, struct inode *,struct dentry *,
+			umode_t,dev_t);
+static int jffs2_rename (struct user_namespace *, struct inode *,
+			 struct dentry *, struct inode *, struct dentry *,
 			 unsigned int);
 
 const struct file_operations jffs2_dir_operations =
@@ -157,8 +160,8 @@ static int jffs2_readdir(struct file *file, struct dir_context *ctx)
 /***********************************************************************/
 
 
-static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
-			umode_t mode, bool excl)
+static int jffs2_create(struct user_namespace *mnt_userns, struct inode *dir_i,
+			struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct jffs2_raw_inode *ri;
 	struct jffs2_inode_info *f, *dir_f;
@@ -276,7 +279,8 @@ static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct de
 
 /***********************************************************************/
 
-static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
+static int jffs2_symlink (struct user_namespace *mnt_userns, struct inode *dir_i,
+			  struct dentry *dentry, const char *target)
 {
 	struct jffs2_inode_info *f, *dir_f;
 	struct jffs2_sb_info *c;
@@ -438,7 +442,8 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
 }
 
 
-static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode)
+static int jffs2_mkdir (struct user_namespace *mnt_userns, struct inode *dir_i,
+		        struct dentry *dentry, umode_t mode)
 {
 	struct jffs2_inode_info *f, *dir_f;
 	struct jffs2_sb_info *c;
@@ -609,7 +614,8 @@ static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 	return ret;
 }
 
-static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
+static int jffs2_mknod (struct user_namespace *mnt_userns, struct inode *dir_i,
+		        struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct jffs2_inode_info *f, *dir_f;
 	struct jffs2_sb_info *c;
@@ -756,7 +762,8 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode
 	return ret;
 }
 
-static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
+static int jffs2_rename (struct user_namespace *mnt_userns,
+			 struct inode *old_dir_i, struct dentry *old_dentry,
 			 struct inode *new_dir_i, struct dentry *new_dentry,
 			 unsigned int flags)
 {
diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index 78858f6e9583..2ac410477c4f 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -190,18 +190,19 @@ int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
 	return 0;
 }
 
-int jffs2_setattr(struct dentry *dentry, struct iattr *iattr)
+int jffs2_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		  struct iattr *iattr)
 {
 	struct inode *inode = d_inode(dentry);
 	int rc;
 
-	rc = setattr_prepare(dentry, iattr);
+	rc = setattr_prepare(&init_user_ns, dentry, iattr);
 	if (rc)
 		return rc;
 
 	rc = jffs2_do_setattr(inode, iattr);
 	if (!rc && (iattr->ia_valid & ATTR_MODE))
-		rc = posix_acl_chmod(inode, inode->i_mode);
+		rc = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
 
 	return rc;
 }
diff --git a/fs/jffs2/os-linux.h b/fs/jffs2/os-linux.h
index ef1cfa61549e..173eccac691d 100644
--- a/fs/jffs2/os-linux.h
+++ b/fs/jffs2/os-linux.h
@@ -164,7 +164,7 @@ long jffs2_ioctl(struct file *, unsigned int, unsigned long);
 extern const struct inode_operations jffs2_symlink_inode_operations;
 
 /* fs.c */
-int jffs2_setattr (struct dentry *, struct iattr *);
+int jffs2_setattr (struct user_namespace *, struct dentry *, struct iattr *);
 int jffs2_do_setattr (struct inode *, struct iattr *);
 struct inode *jffs2_iget(struct super_block *, unsigned long);
 void jffs2_evict_inode (struct inode *);
diff --git a/fs/jffs2/security.c b/fs/jffs2/security.c
index c2332e30f218..aef5522551db 100644
--- a/fs/jffs2/security.c
+++ b/fs/jffs2/security.c
@@ -57,6 +57,7 @@ static int jffs2_security_getxattr(const struct xattr_handler *handler,
 }
 
 static int jffs2_security_setxattr(const struct xattr_handler *handler,
+				   struct user_namespace *mnt_userns,
 				   struct dentry *unused, struct inode *inode,
 				   const char *name, const void *buffer,
 				   size_t size, int flags)
diff --git a/fs/jffs2/xattr_trusted.c b/fs/jffs2/xattr_trusted.c
index 5d6030826c52..cc3f24883e7d 100644
--- a/fs/jffs2/xattr_trusted.c
+++ b/fs/jffs2/xattr_trusted.c
@@ -25,6 +25,7 @@ static int jffs2_trusted_getxattr(const struct xattr_handler *handler,
 }
 
 static int jffs2_trusted_setxattr(const struct xattr_handler *handler,
+				  struct user_namespace *mnt_userns,
 				  struct dentry *unused, struct inode *inode,
 				  const char *name, const void *buffer,
 				  size_t size, int flags)
diff --git a/fs/jffs2/xattr_user.c b/fs/jffs2/xattr_user.c
index 9d027b4abcf9..fb945977c013 100644
--- a/fs/jffs2/xattr_user.c
+++ b/fs/jffs2/xattr_user.c
@@ -25,6 +25,7 @@ static int jffs2_user_getxattr(const struct xattr_handler *handler,
 }
 
 static int jffs2_user_setxattr(const struct xattr_handler *handler,
+			       struct user_namespace *mnt_userns,
 			       struct dentry *unused, struct inode *inode,
 			       const char *name, const void *buffer,
 			       size_t size, int flags)
diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c
index 92cc0ac2d1fc..43c285c3d2a7 100644
--- a/fs/jfs/acl.c
+++ b/fs/jfs/acl.c
@@ -91,7 +91,8 @@ out:
 	return rc;
 }
 
-int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+int jfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		struct posix_acl *acl, int type)
 {
 	int rc;
 	tid_t tid;
@@ -101,7 +102,7 @@ int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 	tid = txBegin(inode->i_sb, 0);
 	mutex_lock(&JFS_IP(inode)->commit_mutex);
 	if (type == ACL_TYPE_ACCESS && acl) {
-		rc = posix_acl_update_mode(inode, &mode, &acl);
+		rc = posix_acl_update_mode(&init_user_ns, inode, &mode, &acl);
 		if (rc)
 			goto end_tx;
 		if (mode != inode->i_mode)
diff --git a/fs/jfs/file.c b/fs/jfs/file.c
index 930d2701f206..28b70e7c7dd4 100644
--- a/fs/jfs/file.c
+++ b/fs/jfs/file.c
@@ -85,12 +85,13 @@ static int jfs_release(struct inode *inode, struct file *file)
 	return 0;
 }
 
-int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
+int jfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		struct iattr *iattr)
 {
 	struct inode *inode = d_inode(dentry);
 	int rc;
 
-	rc = setattr_prepare(dentry, iattr);
+	rc = setattr_prepare(&init_user_ns, dentry, iattr);
 	if (rc)
 		return rc;
 
@@ -118,11 +119,11 @@ int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
 		jfs_truncate(inode);
 	}
 
-	setattr_copy(inode, iattr);
+	setattr_copy(&init_user_ns, inode, iattr);
 	mark_inode_dirty(inode);
 
 	if (iattr->ia_valid & ATTR_MODE)
-		rc = posix_acl_chmod(inode, inode->i_mode);
+		rc = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
 	return rc;
 }
 
diff --git a/fs/jfs/ioctl.c b/fs/jfs/ioctl.c
index 10ee0ecca1a8..2581d4db58ff 100644
--- a/fs/jfs/ioctl.c
+++ b/fs/jfs/ioctl.c
@@ -76,7 +76,7 @@ long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		if (err)
 			return err;
 
-		if (!inode_owner_or_capable(inode)) {
+		if (!inode_owner_or_capable(&init_user_ns, inode)) {
 			err = -EACCES;
 			goto setflags_out;
 		}
diff --git a/fs/jfs/jfs_acl.h b/fs/jfs/jfs_acl.h
index 9f8f92dd6f84..7ae389a7a366 100644
--- a/fs/jfs/jfs_acl.h
+++ b/fs/jfs/jfs_acl.h
@@ -8,7 +8,8 @@
 #ifdef CONFIG_JFS_POSIX_ACL
 
 struct posix_acl *jfs_get_acl(struct inode *inode, int type);
-int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+int jfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		struct posix_acl *acl, int type);
 int jfs_init_acl(tid_t, struct inode *, struct inode *);
 
 #else
diff --git a/fs/jfs/jfs_inode.c b/fs/jfs/jfs_inode.c
index 4cef170630db..59379089e939 100644
--- a/fs/jfs/jfs_inode.c
+++ b/fs/jfs/jfs_inode.c
@@ -64,7 +64,7 @@ struct inode *ialloc(struct inode *parent, umode_t mode)
 		goto fail_put;
 	}
 
-	inode_init_owner(inode, parent, mode);
+	inode_init_owner(&init_user_ns, inode, parent, mode);
 	/*
 	 * New inodes need to save sane values on disk when
 	 * uid & gid mount options are used
diff --git a/fs/jfs/jfs_inode.h b/fs/jfs/jfs_inode.h
index 70a0d12e427e..01daa0cb0ae5 100644
--- a/fs/jfs/jfs_inode.h
+++ b/fs/jfs/jfs_inode.h
@@ -26,7 +26,7 @@ extern struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
 	int fh_len, int fh_type);
 extern void jfs_set_inode_flags(struct inode *);
 extern int jfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
-extern int jfs_setattr(struct dentry *, struct iattr *);
+extern int jfs_setattr(struct user_namespace *, struct dentry *, struct iattr *);
 
 extern const struct address_space_operations jfs_aops;
 extern const struct inode_operations jfs_dir_inode_operations;
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 7a55d14cc1af..9abed0d750e5 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -59,8 +59,8 @@ static inline void free_ea_wmap(struct inode *inode)
  * RETURN:	Errors from subroutines
  *
  */
-static int jfs_create(struct inode *dip, struct dentry *dentry, umode_t mode,
-		bool excl)
+static int jfs_create(struct user_namespace *mnt_userns, struct inode *dip,
+		      struct dentry *dentry, umode_t mode, bool excl)
 {
 	int rc = 0;
 	tid_t tid;		/* transaction id */
@@ -192,7 +192,8 @@ static int jfs_create(struct inode *dip, struct dentry *dentry, umode_t mode,
  * note:
  * EACCES: user needs search+write permission on the parent directory
  */
-static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
+static int jfs_mkdir(struct user_namespace *mnt_userns, struct inode *dip,
+		     struct dentry *dentry, umode_t mode)
 {
 	int rc = 0;
 	tid_t tid;		/* transaction id */
@@ -868,8 +869,8 @@ static int jfs_link(struct dentry *old_dentry,
  * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
 */
 
-static int jfs_symlink(struct inode *dip, struct dentry *dentry,
-		const char *name)
+static int jfs_symlink(struct user_namespace *mnt_userns, struct inode *dip,
+		       struct dentry *dentry, const char *name)
 {
 	int rc;
 	tid_t tid;
@@ -1058,9 +1059,9 @@ static int jfs_symlink(struct inode *dip, struct dentry *dentry,
  *
  * FUNCTION:	rename a file or directory
  */
-static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
-		      struct inode *new_dir, struct dentry *new_dentry,
-		      unsigned int flags)
+static int jfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		      struct dentry *old_dentry, struct inode *new_dir,
+		      struct dentry *new_dentry, unsigned int flags)
 {
 	struct btstack btstack;
 	ino_t ino;
@@ -1344,8 +1345,8 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
  *
  * FUNCTION:	Create a special file (device)
  */
-static int jfs_mknod(struct inode *dir, struct dentry *dentry,
-		umode_t mode, dev_t rdev)
+static int jfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct jfs_inode_info *jfs_ip;
 	struct btstack btstack;
diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c
index db41e7803163..f9273f6901c8 100644
--- a/fs/jfs/xattr.c
+++ b/fs/jfs/xattr.c
@@ -932,6 +932,7 @@ static int jfs_xattr_get(const struct xattr_handler *handler,
 }
 
 static int jfs_xattr_set(const struct xattr_handler *handler,
+			 struct user_namespace *mnt_userns,
 			 struct dentry *unused, struct inode *inode,
 			 const char *name, const void *value,
 			 size_t size, int flags)
@@ -950,6 +951,7 @@ static int jfs_xattr_get_os2(const struct xattr_handler *handler,
 }
 
 static int jfs_xattr_set_os2(const struct xattr_handler *handler,
+			     struct user_namespace *mnt_userns,
 			     struct dentry *unused, struct inode *inode,
 			     const char *name, const void *value,
 			     size_t size, int flags)
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 7a53eed69fef..7e0e62deab53 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -1110,7 +1110,8 @@ static struct dentry *kernfs_iop_lookup(struct inode *dir,
 	return ret;
 }
 
-static int kernfs_iop_mkdir(struct inode *dir, struct dentry *dentry,
+static int kernfs_iop_mkdir(struct user_namespace *mnt_userns,
+			    struct inode *dir, struct dentry *dentry,
 			    umode_t mode)
 {
 	struct kernfs_node *parent = dir->i_private;
@@ -1147,7 +1148,8 @@ static int kernfs_iop_rmdir(struct inode *dir, struct dentry *dentry)
 	return ret;
 }
 
-static int kernfs_iop_rename(struct inode *old_dir, struct dentry *old_dentry,
+static int kernfs_iop_rename(struct user_namespace *mnt_userns,
+			     struct inode *old_dir, struct dentry *old_dentry,
 			     struct inode *new_dir, struct dentry *new_dentry,
 			     unsigned int flags)
 {
diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c
index fc2469a20fed..d73950fc3d57 100644
--- a/fs/kernfs/inode.c
+++ b/fs/kernfs/inode.c
@@ -112,7 +112,8 @@ int kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr)
 	return ret;
 }
 
-int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr)
+int kernfs_iop_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		       struct iattr *iattr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct kernfs_node *kn = inode->i_private;
@@ -122,7 +123,7 @@ int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr)
 		return -EINVAL;
 
 	mutex_lock(&kernfs_mutex);
-	error = setattr_prepare(dentry, iattr);
+	error = setattr_prepare(&init_user_ns, dentry, iattr);
 	if (error)
 		goto out;
 
@@ -131,7 +132,7 @@ int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr)
 		goto out;
 
 	/* this ignores size changes */
-	setattr_copy(inode, iattr);
+	setattr_copy(&init_user_ns, inode, iattr);
 
 out:
 	mutex_unlock(&kernfs_mutex);
@@ -183,7 +184,8 @@ static void kernfs_refresh_inode(struct kernfs_node *kn, struct inode *inode)
 		set_nlink(inode, kn->dir.subdirs + 2);
 }
 
-int kernfs_iop_getattr(const struct path *path, struct kstat *stat,
+int kernfs_iop_getattr(struct user_namespace *mnt_userns,
+		       const struct path *path, struct kstat *stat,
 		       u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
@@ -193,7 +195,7 @@ int kernfs_iop_getattr(const struct path *path, struct kstat *stat,
 	kernfs_refresh_inode(kn, inode);
 	mutex_unlock(&kernfs_mutex);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	return 0;
 }
 
@@ -272,7 +274,8 @@ void kernfs_evict_inode(struct inode *inode)
 	kernfs_put(kn);
 }
 
-int kernfs_iop_permission(struct inode *inode, int mask)
+int kernfs_iop_permission(struct user_namespace *mnt_userns,
+			  struct inode *inode, int mask)
 {
 	struct kernfs_node *kn;
 
@@ -285,7 +288,7 @@ int kernfs_iop_permission(struct inode *inode, int mask)
 	kernfs_refresh_inode(kn, inode);
 	mutex_unlock(&kernfs_mutex);
 
-	return generic_permission(inode, mask);
+	return generic_permission(&init_user_ns, inode, mask);
 }
 
 int kernfs_xattr_get(struct kernfs_node *kn, const char *name,
@@ -319,6 +322,7 @@ static int kernfs_vfs_xattr_get(const struct xattr_handler *handler,
 }
 
 static int kernfs_vfs_xattr_set(const struct xattr_handler *handler,
+				struct user_namespace *mnt_userns,
 				struct dentry *unused, struct inode *inode,
 				const char *suffix, const void *value,
 				size_t size, int flags)
@@ -385,6 +389,7 @@ static int kernfs_vfs_user_xattr_rm(struct kernfs_node *kn,
 }
 
 static int kernfs_vfs_user_xattr_set(const struct xattr_handler *handler,
+				     struct user_namespace *mnt_userns,
 				     struct dentry *unused, struct inode *inode,
 				     const char *suffix, const void *value,
 				     size_t size, int flags)
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h
index 7ee97ef59184..ccc3b44f6306 100644
--- a/fs/kernfs/kernfs-internal.h
+++ b/fs/kernfs/kernfs-internal.h
@@ -89,9 +89,12 @@ extern struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache;
  */
 extern const struct xattr_handler *kernfs_xattr_handlers[];
 void kernfs_evict_inode(struct inode *inode);
-int kernfs_iop_permission(struct inode *inode, int mask);
-int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
-int kernfs_iop_getattr(const struct path *path, struct kstat *stat,
+int kernfs_iop_permission(struct user_namespace *mnt_userns,
+			  struct inode *inode, int mask);
+int kernfs_iop_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		       struct iattr *iattr);
+int kernfs_iop_getattr(struct user_namespace *mnt_userns,
+		       const struct path *path, struct kstat *stat,
 		       u32 request_mask, unsigned int query_flags);
 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
 int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr);
diff --git a/fs/libfs.c b/fs/libfs.c
index 1e551766bc52..e2de5401abca 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -27,11 +27,12 @@
 
 #include "internal.h"
 
-int simple_getattr(const struct path *path, struct kstat *stat,
-		   u32 request_mask, unsigned int query_flags)
+int simple_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		   struct kstat *stat, u32 request_mask,
+		   unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	stat->blocks = inode->i_mapping->nrpages << (PAGE_SHIFT - 9);
 	return 0;
 }
@@ -447,9 +448,9 @@ int simple_rmdir(struct inode *dir, struct dentry *dentry)
 }
 EXPORT_SYMBOL(simple_rmdir);
 
-int simple_rename(struct inode *old_dir, struct dentry *old_dentry,
-		  struct inode *new_dir, struct dentry *new_dentry,
-		  unsigned int flags)
+int simple_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		  struct dentry *old_dentry, struct inode *new_dir,
+		  struct dentry *new_dentry, unsigned int flags)
 {
 	struct inode *inode = d_inode(old_dentry);
 	int they_are_dirs = d_is_dir(old_dentry);
@@ -492,18 +493,19 @@ EXPORT_SYMBOL(simple_rename);
  * on simple regular filesystems.  Anything that needs to change on-disk
  * or wire state on size changes needs its own setattr method.
  */
-int simple_setattr(struct dentry *dentry, struct iattr *iattr)
+int simple_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		   struct iattr *iattr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error;
 
-	error = setattr_prepare(dentry, iattr);
+	error = setattr_prepare(mnt_userns, dentry, iattr);
 	if (error)
 		return error;
 
 	if (iattr->ia_valid & ATTR_SIZE)
 		truncate_setsize(inode, iattr->ia_size);
-	setattr_copy(inode, iattr);
+	setattr_copy(mnt_userns, inode, iattr);
 	mark_inode_dirty(inode);
 	return 0;
 }
@@ -1295,15 +1297,17 @@ static struct dentry *empty_dir_lookup(struct inode *dir, struct dentry *dentry,
 	return ERR_PTR(-ENOENT);
 }
 
-static int empty_dir_getattr(const struct path *path, struct kstat *stat,
+static int empty_dir_getattr(struct user_namespace *mnt_userns,
+			     const struct path *path, struct kstat *stat,
 			     u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	return 0;
 }
 
-static int empty_dir_setattr(struct dentry *dentry, struct iattr *attr)
+static int empty_dir_setattr(struct user_namespace *mnt_userns,
+			     struct dentry *dentry, struct iattr *attr)
 {
 	return -EPERM;
 }
diff --git a/fs/minix/bitmap.c b/fs/minix/bitmap.c
index f4e5e5181a14..9115948c624e 100644
--- a/fs/minix/bitmap.c
+++ b/fs/minix/bitmap.c
@@ -252,7 +252,7 @@ struct inode *minix_new_inode(const struct inode *dir, umode_t mode, int *error)
 		iput(inode);
 		return NULL;
 	}
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 	inode->i_ino = j;
 	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 	inode->i_blocks = 0;
diff --git a/fs/minix/file.c b/fs/minix/file.c
index c50b0a20fcd9..6a7bd2d9eec0 100644
--- a/fs/minix/file.c
+++ b/fs/minix/file.c
@@ -22,12 +22,13 @@ const struct file_operations minix_file_operations = {
 	.splice_read	= generic_file_splice_read,
 };
 
-static int minix_setattr(struct dentry *dentry, struct iattr *attr)
+static int minix_setattr(struct user_namespace *mnt_userns,
+			 struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		return error;
 
@@ -41,7 +42,7 @@ static int minix_setattr(struct dentry *dentry, struct iattr *attr)
 		minix_truncate(inode);
 	}
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index 34f546404aa1..a532a99bbe81 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -652,13 +652,13 @@ static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
 	return err;
 }
 
-int minix_getattr(const struct path *path, struct kstat *stat,
-		  u32 request_mask, unsigned int flags)
+int minix_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		  struct kstat *stat, u32 request_mask, unsigned int flags)
 {
 	struct super_block *sb = path->dentry->d_sb;
 	struct inode *inode = d_inode(path->dentry);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	if (INODE_VERSION(inode) == MINIX_V1)
 		stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
 	else
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index 168d45d3de73..202173368025 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -51,7 +51,8 @@ extern unsigned long minix_count_free_inodes(struct super_block *sb);
 extern int minix_new_block(struct inode * inode);
 extern void minix_free_block(struct inode *inode, unsigned long block);
 extern unsigned long minix_count_free_blocks(struct super_block *sb);
-extern int minix_getattr(const struct path *, struct kstat *, u32, unsigned int);
+extern int minix_getattr(struct user_namespace *, const struct path *,
+			 struct kstat *, u32, unsigned int);
 extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len);
 
 extern void V1_minix_truncate(struct inode *);
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 1a6084d2b02e..937fa5fae2b8 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -33,7 +33,8 @@ static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, un
 	return d_splice_alias(inode, dentry);
 }
 
-static int minix_mknod(struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
+static int minix_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	int error;
 	struct inode *inode;
@@ -51,7 +52,8 @@ static int minix_mknod(struct inode * dir, struct dentry *dentry, umode_t mode,
 	return error;
 }
 
-static int minix_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int minix_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+			 struct dentry *dentry, umode_t mode)
 {
 	int error;
 	struct inode *inode = minix_new_inode(dir, mode, &error);
@@ -63,14 +65,14 @@ static int minix_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 	return error;
 }
 
-static int minix_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		bool excl)
+static int minix_create(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode, bool excl)
 {
-	return minix_mknod(dir, dentry, mode, 0);
+	return minix_mknod(mnt_userns, dir, dentry, mode, 0);
 }
 
-static int minix_symlink(struct inode * dir, struct dentry *dentry,
-	  const char * symname)
+static int minix_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			 struct dentry *dentry, const char *symname)
 {
 	int err = -ENAMETOOLONG;
 	int i = strlen(symname)+1;
@@ -109,7 +111,8 @@ static int minix_link(struct dentry * old_dentry, struct inode * dir,
 	return add_nondir(dentry, inode);
 }
 
-static int minix_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
+static int minix_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode)
 {
 	struct inode * inode;
 	int err;
@@ -181,8 +184,9 @@ static int minix_rmdir(struct inode * dir, struct dentry *dentry)
 	return err;
 }
 
-static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
-			struct inode * new_dir, struct dentry *new_dentry,
+static int minix_rename(struct user_namespace *mnt_userns,
+			struct inode *old_dir, struct dentry *old_dentry,
+			struct inode *new_dir, struct dentry *new_dentry,
 			unsigned int flags)
 {
 	struct inode * old_inode = d_inode(old_dentry);
diff --git a/fs/mount.h b/fs/mount.h
index ce6c376e0bc2..0b6e08cf8afb 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -124,16 +124,6 @@ static inline void get_mnt_ns(struct mnt_namespace *ns)
 
 extern seqlock_t mount_lock;
 
-static inline void lock_mount_hash(void)
-{
-	write_seqlock(&mount_lock);
-}
-
-static inline void unlock_mount_hash(void)
-{
-	write_sequnlock(&mount_lock);
-}
-
 struct proc_mounts {
 	struct mnt_namespace *ns;
 	struct path root;
diff --git a/fs/namei.c b/fs/namei.c
index de74ad2bc6e2..216f16e74351 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -259,7 +259,24 @@ void putname(struct filename *name)
 		__putname(name);
 }
 
-static int check_acl(struct inode *inode, int mask)
+/**
+ * check_acl - perform ACL permission checking
+ * @mnt_userns:	user namespace of the mount the inode was found from
+ * @inode:	inode to check permissions on
+ * @mask:	right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC ...)
+ *
+ * This function performs the ACL permission checking. Since this function
+ * retrieve POSIX acls it needs to know whether it is called from a blocking or
+ * non-blocking context and thus cares about the MAY_NOT_BLOCK bit.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
+ */
+static int check_acl(struct user_namespace *mnt_userns,
+		     struct inode *inode, int mask)
 {
 #ifdef CONFIG_FS_POSIX_ACL
 	struct posix_acl *acl;
@@ -271,14 +288,14 @@ static int check_acl(struct inode *inode, int mask)
 		/* no ->get_acl() calls in RCU mode... */
 		if (is_uncached_acl(acl))
 			return -ECHILD;
-	        return posix_acl_permission(inode, acl, mask);
+	        return posix_acl_permission(mnt_userns, inode, acl, mask);
 	}
 
 	acl = get_acl(inode, ACL_TYPE_ACCESS);
 	if (IS_ERR(acl))
 		return PTR_ERR(acl);
 	if (acl) {
-	        int error = posix_acl_permission(inode, acl, mask);
+	        int error = posix_acl_permission(mnt_userns, inode, acl, mask);
 	        posix_acl_release(acl);
 	        return error;
 	}
@@ -287,18 +304,31 @@ static int check_acl(struct inode *inode, int mask)
 	return -EAGAIN;
 }
 
-/*
- * This does the basic UNIX permission checking.
+/**
+ * acl_permission_check - perform basic UNIX permission checking
+ * @mnt_userns:	user namespace of the mount the inode was found from
+ * @inode:	inode to check permissions on
+ * @mask:	right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC ...)
+ *
+ * This function performs the basic UNIX permission checking. Since this
+ * function may retrieve POSIX acls it needs to know whether it is called from a
+ * blocking or non-blocking context and thus cares about the MAY_NOT_BLOCK bit.
  *
- * Note that the POSIX ACL check cares about the MAY_NOT_BLOCK bit,
- * for RCU walking.
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
  */
-static int acl_permission_check(struct inode *inode, int mask)
+static int acl_permission_check(struct user_namespace *mnt_userns,
+				struct inode *inode, int mask)
 {
 	unsigned int mode = inode->i_mode;
+	kuid_t i_uid;
 
 	/* Are we the owner? If so, ACL's don't matter */
-	if (likely(uid_eq(current_fsuid(), inode->i_uid))) {
+	i_uid = i_uid_into_mnt(mnt_userns, inode);
+	if (likely(uid_eq(current_fsuid(), i_uid))) {
 		mask &= 7;
 		mode >>= 6;
 		return (mask & ~mode) ? -EACCES : 0;
@@ -306,7 +336,7 @@ static int acl_permission_check(struct inode *inode, int mask)
 
 	/* Do we have ACL's? */
 	if (IS_POSIXACL(inode) && (mode & S_IRWXG)) {
-		int error = check_acl(inode, mask);
+		int error = check_acl(mnt_userns, inode, mask);
 		if (error != -EAGAIN)
 			return error;
 	}
@@ -320,7 +350,8 @@ static int acl_permission_check(struct inode *inode, int mask)
 	 * about? Need to check group ownership if so.
 	 */
 	if (mask & (mode ^ (mode >> 3))) {
-		if (in_group_p(inode->i_gid))
+		kgid_t kgid = i_gid_into_mnt(mnt_userns, inode);
+		if (in_group_p(kgid))
 			mode >>= 3;
 	}
 
@@ -330,6 +361,7 @@ static int acl_permission_check(struct inode *inode, int mask)
 
 /**
  * generic_permission -  check for access rights on a Posix-like filesystem
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @inode:	inode to check access rights for
  * @mask:	right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC,
  *		%MAY_NOT_BLOCK ...)
@@ -342,25 +374,33 @@ static int acl_permission_check(struct inode *inode, int mask)
  * generic_permission is rcu-walk aware. It returns -ECHILD in case an rcu-walk
  * request cannot be satisfied (eg. requires blocking or too much complexity).
  * It would then be called again in ref-walk mode.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
  */
-int generic_permission(struct inode *inode, int mask)
+int generic_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		       int mask)
 {
 	int ret;
 
 	/*
 	 * Do the basic permission checks.
 	 */
-	ret = acl_permission_check(inode, mask);
+	ret = acl_permission_check(mnt_userns, inode, mask);
 	if (ret != -EACCES)
 		return ret;
 
 	if (S_ISDIR(inode->i_mode)) {
 		/* DACs are overridable for directories */
 		if (!(mask & MAY_WRITE))
-			if (capable_wrt_inode_uidgid(inode,
+			if (capable_wrt_inode_uidgid(mnt_userns, inode,
 						     CAP_DAC_READ_SEARCH))
 				return 0;
-		if (capable_wrt_inode_uidgid(inode, CAP_DAC_OVERRIDE))
+		if (capable_wrt_inode_uidgid(mnt_userns, inode,
+					     CAP_DAC_OVERRIDE))
 			return 0;
 		return -EACCES;
 	}
@@ -370,7 +410,8 @@ int generic_permission(struct inode *inode, int mask)
 	 */
 	mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
 	if (mask == MAY_READ)
-		if (capable_wrt_inode_uidgid(inode, CAP_DAC_READ_SEARCH))
+		if (capable_wrt_inode_uidgid(mnt_userns, inode,
+					     CAP_DAC_READ_SEARCH))
 			return 0;
 	/*
 	 * Read/write DACs are always overridable.
@@ -378,31 +419,38 @@ int generic_permission(struct inode *inode, int mask)
 	 * at least one exec bit set.
 	 */
 	if (!(mask & MAY_EXEC) || (inode->i_mode & S_IXUGO))
-		if (capable_wrt_inode_uidgid(inode, CAP_DAC_OVERRIDE))
+		if (capable_wrt_inode_uidgid(mnt_userns, inode,
+					     CAP_DAC_OVERRIDE))
 			return 0;
 
 	return -EACCES;
 }
 EXPORT_SYMBOL(generic_permission);
 
-/*
+/**
+ * do_inode_permission - UNIX permission checking
+ * @mnt_userns:	user namespace of the mount the inode was found from
+ * @inode:	inode to check permissions on
+ * @mask:	right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC ...)
+ *
  * We _really_ want to just do "generic_permission()" without
  * even looking at the inode->i_op values. So we keep a cache
  * flag in inode->i_opflags, that says "this has not special
  * permission function, use the fast case".
  */
-static inline int do_inode_permission(struct inode *inode, int mask)
+static inline int do_inode_permission(struct user_namespace *mnt_userns,
+				      struct inode *inode, int mask)
 {
 	if (unlikely(!(inode->i_opflags & IOP_FASTPERM))) {
 		if (likely(inode->i_op->permission))
-			return inode->i_op->permission(inode, mask);
+			return inode->i_op->permission(mnt_userns, inode, mask);
 
 		/* This gets set once for the inode lifetime */
 		spin_lock(&inode->i_lock);
 		inode->i_opflags |= IOP_FASTPERM;
 		spin_unlock(&inode->i_lock);
 	}
-	return generic_permission(inode, mask);
+	return generic_permission(mnt_userns, inode, mask);
 }
 
 /**
@@ -427,8 +475,9 @@ static int sb_permission(struct super_block *sb, struct inode *inode, int mask)
 
 /**
  * inode_permission - Check for access rights to a given inode
- * @inode: Inode to check permission on
- * @mask: Right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC)
+ * @mnt_userns:	User namespace of the mount the inode was found from
+ * @inode:	Inode to check permission on
+ * @mask:	Right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC)
  *
  * Check for read/write/execute permissions on an inode.  We use fs[ug]id for
  * this, letting us set arbitrary permissions for filesystem access without
@@ -436,7 +485,8 @@ static int sb_permission(struct super_block *sb, struct inode *inode, int mask)
  *
  * When checking for MAY_APPEND, MAY_WRITE must also be set in @mask.
  */
-int inode_permission(struct inode *inode, int mask)
+int inode_permission(struct user_namespace *mnt_userns,
+		     struct inode *inode, int mask)
 {
 	int retval;
 
@@ -456,11 +506,11 @@ int inode_permission(struct inode *inode, int mask)
 		 * written back improperly if their true value is unknown
 		 * to the vfs.
 		 */
-		if (HAS_UNMAPPED_ID(inode))
+		if (HAS_UNMAPPED_ID(mnt_userns, inode))
 			return -EACCES;
 	}
 
-	retval = do_inode_permission(inode, mask);
+	retval = do_inode_permission(mnt_userns, inode, mask);
 	if (retval)
 		return retval;
 
@@ -960,11 +1010,16 @@ int sysctl_protected_regular __read_mostly;
  */
 static inline int may_follow_link(struct nameidata *nd, const struct inode *inode)
 {
+	struct user_namespace *mnt_userns;
+	kuid_t i_uid;
+
 	if (!sysctl_protected_symlinks)
 		return 0;
 
+	mnt_userns = mnt_user_ns(nd->path.mnt);
+	i_uid = i_uid_into_mnt(mnt_userns, inode);
 	/* Allowed if owner and follower match. */
-	if (uid_eq(current_cred()->fsuid, inode->i_uid))
+	if (uid_eq(current_cred()->fsuid, i_uid))
 		return 0;
 
 	/* Allowed if parent directory not sticky and world-writable. */
@@ -972,7 +1027,7 @@ static inline int may_follow_link(struct nameidata *nd, const struct inode *inod
 		return 0;
 
 	/* Allowed if parent directory and link owner match. */
-	if (uid_valid(nd->dir_uid) && uid_eq(nd->dir_uid, inode->i_uid))
+	if (uid_valid(nd->dir_uid) && uid_eq(nd->dir_uid, i_uid))
 		return 0;
 
 	if (nd->flags & LOOKUP_RCU)
@@ -985,6 +1040,7 @@ static inline int may_follow_link(struct nameidata *nd, const struct inode *inod
 
 /**
  * safe_hardlink_source - Check for safe hardlink conditions
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @inode: the source inode to hardlink from
  *
  * Return false if at least one of the following conditions:
@@ -995,7 +1051,8 @@ static inline int may_follow_link(struct nameidata *nd, const struct inode *inod
  *
  * Otherwise returns true.
  */
-static bool safe_hardlink_source(struct inode *inode)
+static bool safe_hardlink_source(struct user_namespace *mnt_userns,
+				 struct inode *inode)
 {
 	umode_t mode = inode->i_mode;
 
@@ -1012,7 +1069,7 @@ static bool safe_hardlink_source(struct inode *inode)
 		return false;
 
 	/* Hardlinking to unreadable or unwritable sources is dangerous. */
-	if (inode_permission(inode, MAY_READ | MAY_WRITE))
+	if (inode_permission(mnt_userns, inode, MAY_READ | MAY_WRITE))
 		return false;
 
 	return true;
@@ -1020,6 +1077,7 @@ static bool safe_hardlink_source(struct inode *inode)
 
 /**
  * may_linkat - Check permissions for creating a hardlink
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @link: the source to hardlink from
  *
  * Block hardlink when all of:
@@ -1028,14 +1086,21 @@ static bool safe_hardlink_source(struct inode *inode)
  *  - hardlink source is unsafe (see safe_hardlink_source() above)
  *  - not CAP_FOWNER in a namespace with the inode owner uid mapped
  *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
+ *
  * Returns 0 if successful, -ve on error.
  */
-int may_linkat(struct path *link)
+int may_linkat(struct user_namespace *mnt_userns, struct path *link)
 {
 	struct inode *inode = link->dentry->d_inode;
 
 	/* Inode writeback is not safe when the uid or gid are invalid. */
-	if (!uid_valid(inode->i_uid) || !gid_valid(inode->i_gid))
+	if (!uid_valid(i_uid_into_mnt(mnt_userns, inode)) ||
+	    !gid_valid(i_gid_into_mnt(mnt_userns, inode)))
 		return -EOVERFLOW;
 
 	if (!sysctl_protected_hardlinks)
@@ -1044,7 +1109,8 @@ int may_linkat(struct path *link)
 	/* Source inode owner (or CAP_FOWNER) can hardlink all they like,
 	 * otherwise, it must be a safe source.
 	 */
-	if (safe_hardlink_source(inode) || inode_owner_or_capable(inode))
+	if (safe_hardlink_source(mnt_userns, inode) ||
+	    inode_owner_or_capable(mnt_userns, inode))
 		return 0;
 
 	audit_log_path_denied(AUDIT_ANOM_LINK, "linkat");
@@ -1055,6 +1121,7 @@ int may_linkat(struct path *link)
  * may_create_in_sticky - Check whether an O_CREAT open in a sticky directory
  *			  should be allowed, or not, on files that already
  *			  exist.
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @dir_mode: mode bits of directory
  * @dir_uid: owner of directory
  * @inode: the inode of the file to open
@@ -1070,16 +1137,25 @@ int may_linkat(struct path *link)
  * the directory doesn't have to be world writable: being group writable will
  * be enough.
  *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
+ *
  * Returns 0 if the open is allowed, -ve on error.
  */
-static int may_create_in_sticky(umode_t dir_mode, kuid_t dir_uid,
-				struct inode * const inode)
+static int may_create_in_sticky(struct user_namespace *mnt_userns,
+				struct nameidata *nd, struct inode *const inode)
 {
+	umode_t dir_mode = nd->dir_mode;
+	kuid_t dir_uid = nd->dir_uid;
+
 	if ((!sysctl_protected_fifos && S_ISFIFO(inode->i_mode)) ||
 	    (!sysctl_protected_regular && S_ISREG(inode->i_mode)) ||
 	    likely(!(dir_mode & S_ISVTX)) ||
-	    uid_eq(inode->i_uid, dir_uid) ||
-	    uid_eq(current_fsuid(), inode->i_uid))
+	    uid_eq(i_uid_into_mnt(mnt_userns, inode), dir_uid) ||
+	    uid_eq(current_fsuid(), i_uid_into_mnt(mnt_userns, inode)))
 		return 0;
 
 	if (likely(dir_mode & 0002) ||
@@ -1569,14 +1645,15 @@ static struct dentry *lookup_slow(const struct qstr *name,
 	return res;
 }
 
-static inline int may_lookup(struct nameidata *nd)
+static inline int may_lookup(struct user_namespace *mnt_userns,
+			     struct nameidata *nd)
 {
 	if (nd->flags & LOOKUP_RCU) {
-		int err = inode_permission(nd->inode, MAY_EXEC|MAY_NOT_BLOCK);
+		int err = inode_permission(mnt_userns, nd->inode, MAY_EXEC|MAY_NOT_BLOCK);
 		if (err != -ECHILD || !try_to_unlazy(nd))
 			return err;
 	}
-	return inode_permission(nd->inode, MAY_EXEC);
+	return inode_permission(mnt_userns, nd->inode, MAY_EXEC);
 }
 
 static int reserve_stack(struct nameidata *nd, struct path *link, unsigned seq)
@@ -2122,11 +2199,13 @@ static int link_path_walk(const char *name, struct nameidata *nd)
 
 	/* At this point we know we have a real path component. */
 	for(;;) {
+		struct user_namespace *mnt_userns;
 		const char *link;
 		u64 hash_len;
 		int type;
 
-		err = may_lookup(nd);
+		mnt_userns = mnt_user_ns(nd->path.mnt);
+		err = may_lookup(mnt_userns, nd);
 		if (err)
 			return err;
 
@@ -2174,7 +2253,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
 OK:
 			/* pathname or trailing symlink, done */
 			if (!depth) {
-				nd->dir_uid = nd->inode->i_uid;
+				nd->dir_uid = i_uid_into_mnt(mnt_userns, nd->inode);
 				nd->dir_mode = nd->inode->i_mode;
 				nd->flags &= ~LOOKUP_PARENT;
 				return 0;
@@ -2511,7 +2590,7 @@ static int lookup_one_len_common(const char *name, struct dentry *base,
 			return err;
 	}
 
-	return inode_permission(base->d_inode, MAY_EXEC);
+	return inode_permission(&init_user_ns, base->d_inode, MAY_EXEC);
 }
 
 /**
@@ -2656,15 +2735,16 @@ int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
 }
 EXPORT_SYMBOL(user_path_at_empty);
 
-int __check_sticky(struct inode *dir, struct inode *inode)
+int __check_sticky(struct user_namespace *mnt_userns, struct inode *dir,
+		   struct inode *inode)
 {
 	kuid_t fsuid = current_fsuid();
 
-	if (uid_eq(inode->i_uid, fsuid))
+	if (uid_eq(i_uid_into_mnt(mnt_userns, inode), fsuid))
 		return 0;
-	if (uid_eq(dir->i_uid, fsuid))
+	if (uid_eq(i_uid_into_mnt(mnt_userns, dir), fsuid))
 		return 0;
-	return !capable_wrt_inode_uidgid(inode, CAP_FOWNER);
+	return !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FOWNER);
 }
 EXPORT_SYMBOL(__check_sticky);
 
@@ -2688,7 +2768,8 @@ EXPORT_SYMBOL(__check_sticky);
  * 11. We don't allow removal of NFS sillyrenamed files; it's handled by
  *     nfs_async_unlink().
  */
-static int may_delete(struct inode *dir, struct dentry *victim, bool isdir)
+static int may_delete(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *victim, bool isdir)
 {
 	struct inode *inode = d_backing_inode(victim);
 	int error;
@@ -2700,19 +2781,21 @@ static int may_delete(struct inode *dir, struct dentry *victim, bool isdir)
 	BUG_ON(victim->d_parent->d_inode != dir);
 
 	/* Inode writeback is not safe when the uid or gid are invalid. */
-	if (!uid_valid(inode->i_uid) || !gid_valid(inode->i_gid))
+	if (!uid_valid(i_uid_into_mnt(mnt_userns, inode)) ||
+	    !gid_valid(i_gid_into_mnt(mnt_userns, inode)))
 		return -EOVERFLOW;
 
 	audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
 
-	error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
+	error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC);
 	if (error)
 		return error;
 	if (IS_APPEND(dir))
 		return -EPERM;
 
-	if (check_sticky(dir, inode) || IS_APPEND(inode) ||
-	    IS_IMMUTABLE(inode) || IS_SWAPFILE(inode) || HAS_UNMAPPED_ID(inode))
+	if (check_sticky(mnt_userns, dir, inode) || IS_APPEND(inode) ||
+	    IS_IMMUTABLE(inode) || IS_SWAPFILE(inode) ||
+	    HAS_UNMAPPED_ID(mnt_userns, inode))
 		return -EPERM;
 	if (isdir) {
 		if (!d_is_dir(victim))
@@ -2737,7 +2820,8 @@ static int may_delete(struct inode *dir, struct dentry *victim, bool isdir)
  *  4. We should have write and exec permissions on dir
  *  5. We can't do it if dir is immutable (done in permission())
  */
-static inline int may_create(struct inode *dir, struct dentry *child)
+static inline int may_create(struct user_namespace *mnt_userns,
+			     struct inode *dir, struct dentry *child)
 {
 	struct user_namespace *s_user_ns;
 	audit_inode_child(dir, child, AUDIT_TYPE_CHILD_CREATE);
@@ -2746,10 +2830,10 @@ static inline int may_create(struct inode *dir, struct dentry *child)
 	if (IS_DEADDIR(dir))
 		return -ENOENT;
 	s_user_ns = dir->i_sb->s_user_ns;
-	if (!kuid_has_mapping(s_user_ns, current_fsuid()) ||
-	    !kgid_has_mapping(s_user_ns, current_fsgid()))
+	if (!kuid_has_mapping(s_user_ns, fsuid_into_mnt(mnt_userns)) ||
+	    !kgid_has_mapping(s_user_ns, fsgid_into_mnt(mnt_userns)))
 		return -EOVERFLOW;
-	return inode_permission(dir, MAY_WRITE | MAY_EXEC);
+	return inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC);
 }
 
 /*
@@ -2796,10 +2880,26 @@ void unlock_rename(struct dentry *p1, struct dentry *p2)
 }
 EXPORT_SYMBOL(unlock_rename);
 
-int vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		bool want_excl)
+/**
+ * vfs_create - create new file
+ * @mnt_userns:	user namespace of the mount the inode was found from
+ * @dir:	inode of @dentry
+ * @dentry:	pointer to dentry of the base directory
+ * @mode:	mode of the new file
+ * @want_excl:	whether the file must not yet exist
+ *
+ * Create a new file.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
+ */
+int vfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+	       struct dentry *dentry, umode_t mode, bool want_excl)
 {
-	int error = may_create(dir, dentry);
+	int error = may_create(mnt_userns, dir, dentry);
 	if (error)
 		return error;
 
@@ -2810,7 +2910,7 @@ int vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 	error = security_inode_create(dir, dentry, mode);
 	if (error)
 		return error;
-	error = dir->i_op->create(dir, dentry, mode, want_excl);
+	error = dir->i_op->create(mnt_userns, dir, dentry, mode, want_excl);
 	if (!error)
 		fsnotify_create(dir, dentry);
 	return error;
@@ -2822,7 +2922,7 @@ int vfs_mkobj(struct dentry *dentry, umode_t mode,
 		void *arg)
 {
 	struct inode *dir = dentry->d_parent->d_inode;
-	int error = may_create(dir, dentry);
+	int error = may_create(&init_user_ns, dir, dentry);
 	if (error)
 		return error;
 
@@ -2844,7 +2944,8 @@ bool may_open_dev(const struct path *path)
 		!(path->mnt->mnt_sb->s_iflags & SB_I_NODEV);
 }
 
-static int may_open(const struct path *path, int acc_mode, int flag)
+static int may_open(struct user_namespace *mnt_userns, const struct path *path,
+		    int acc_mode, int flag)
 {
 	struct dentry *dentry = path->dentry;
 	struct inode *inode = dentry->d_inode;
@@ -2879,7 +2980,7 @@ static int may_open(const struct path *path, int acc_mode, int flag)
 		break;
 	}
 
-	error = inode_permission(inode, MAY_OPEN | acc_mode);
+	error = inode_permission(mnt_userns, inode, MAY_OPEN | acc_mode);
 	if (error)
 		return error;
 
@@ -2894,13 +2995,13 @@ static int may_open(const struct path *path, int acc_mode, int flag)
 	}
 
 	/* O_NOATIME can only be set by the owner or superuser */
-	if (flag & O_NOATIME && !inode_owner_or_capable(inode))
+	if (flag & O_NOATIME && !inode_owner_or_capable(mnt_userns, inode))
 		return -EPERM;
 
 	return 0;
 }
 
-static int handle_truncate(struct file *filp)
+static int handle_truncate(struct user_namespace *mnt_userns, struct file *filp)
 {
 	const struct path *path = &filp->f_path;
 	struct inode *inode = path->dentry->d_inode;
@@ -2914,7 +3015,7 @@ static int handle_truncate(struct file *filp)
 	if (!error)
 		error = security_path_truncate(path);
 	if (!error) {
-		error = do_truncate(path->dentry, 0,
+		error = do_truncate(mnt_userns, path->dentry, 0,
 				    ATTR_MTIME|ATTR_CTIME|ATTR_OPEN,
 				    filp);
 	}
@@ -2929,7 +3030,9 @@ static inline int open_to_namei_flags(int flag)
 	return flag;
 }
 
-static int may_o_create(const struct path *dir, struct dentry *dentry, umode_t mode)
+static int may_o_create(struct user_namespace *mnt_userns,
+			const struct path *dir, struct dentry *dentry,
+			umode_t mode)
 {
 	struct user_namespace *s_user_ns;
 	int error = security_path_mknod(dir, dentry, mode, 0);
@@ -2937,11 +3040,12 @@ static int may_o_create(const struct path *dir, struct dentry *dentry, umode_t m
 		return error;
 
 	s_user_ns = dir->dentry->d_sb->s_user_ns;
-	if (!kuid_has_mapping(s_user_ns, current_fsuid()) ||
-	    !kgid_has_mapping(s_user_ns, current_fsgid()))
+	if (!kuid_has_mapping(s_user_ns, fsuid_into_mnt(mnt_userns)) ||
+	    !kgid_has_mapping(s_user_ns, fsgid_into_mnt(mnt_userns)))
 		return -EOVERFLOW;
 
-	error = inode_permission(dir->dentry->d_inode, MAY_WRITE | MAY_EXEC);
+	error = inode_permission(mnt_userns, dir->dentry->d_inode,
+				 MAY_WRITE | MAY_EXEC);
 	if (error)
 		return error;
 
@@ -3020,6 +3124,7 @@ static struct dentry *lookup_open(struct nameidata *nd, struct file *file,
 				  const struct open_flags *op,
 				  bool got_write)
 {
+	struct user_namespace *mnt_userns;
 	struct dentry *dir = nd->path.dentry;
 	struct inode *dir_inode = dir->d_inode;
 	int open_flag = op->open_flag;
@@ -3067,13 +3172,15 @@ static struct dentry *lookup_open(struct nameidata *nd, struct file *file,
 	 */
 	if (unlikely(!got_write))
 		open_flag &= ~O_TRUNC;
+	mnt_userns = mnt_user_ns(nd->path.mnt);
 	if (open_flag & O_CREAT) {
 		if (open_flag & O_EXCL)
 			open_flag &= ~O_TRUNC;
 		if (!IS_POSIXACL(dir->d_inode))
 			mode &= ~current_umask();
 		if (likely(got_write))
-			create_error = may_o_create(&nd->path, dentry, mode);
+			create_error = may_o_create(mnt_userns, &nd->path,
+						    dentry, mode);
 		else
 			create_error = -EROFS;
 	}
@@ -3108,8 +3215,9 @@ static struct dentry *lookup_open(struct nameidata *nd, struct file *file,
 			error = -EACCES;
 			goto out_dput;
 		}
-		error = dir_inode->i_op->create(dir_inode, dentry, mode,
-						open_flag & O_EXCL);
+
+		error = dir_inode->i_op->create(mnt_userns, dir_inode, dentry,
+						mode, open_flag & O_EXCL);
 		if (error)
 			goto out_dput;
 	}
@@ -3213,6 +3321,7 @@ finish_lookup:
 static int do_open(struct nameidata *nd,
 		   struct file *file, const struct open_flags *op)
 {
+	struct user_namespace *mnt_userns;
 	int open_flag = op->open_flag;
 	bool do_truncate;
 	int acc_mode;
@@ -3225,12 +3334,13 @@ static int do_open(struct nameidata *nd,
 	}
 	if (!(file->f_mode & FMODE_CREATED))
 		audit_inode(nd->name, nd->path.dentry, 0);
+	mnt_userns = mnt_user_ns(nd->path.mnt);
 	if (open_flag & O_CREAT) {
 		if ((open_flag & O_EXCL) && !(file->f_mode & FMODE_CREATED))
 			return -EEXIST;
 		if (d_is_dir(nd->path.dentry))
 			return -EISDIR;
-		error = may_create_in_sticky(nd->dir_mode, nd->dir_uid,
+		error = may_create_in_sticky(mnt_userns, nd,
 					     d_backing_inode(nd->path.dentry));
 		if (unlikely(error))
 			return error;
@@ -3250,13 +3360,13 @@ static int do_open(struct nameidata *nd,
 			return error;
 		do_truncate = true;
 	}
-	error = may_open(&nd->path, acc_mode, open_flag);
+	error = may_open(mnt_userns, &nd->path, acc_mode, open_flag);
 	if (!error && !(file->f_mode & FMODE_OPENED))
 		error = vfs_open(&nd->path, file);
 	if (!error)
 		error = ima_file_check(file, op->acc_mode);
 	if (!error && do_truncate)
-		error = handle_truncate(file);
+		error = handle_truncate(mnt_userns, file);
 	if (unlikely(error > 0)) {
 		WARN_ON(1);
 		error = -EINVAL;
@@ -3266,7 +3376,23 @@ static int do_open(struct nameidata *nd,
 	return error;
 }
 
-struct dentry *vfs_tmpfile(struct dentry *dentry, umode_t mode, int open_flag)
+/**
+ * vfs_tmpfile - create tmpfile
+ * @mnt_userns:	user namespace of the mount the inode was found from
+ * @dentry:	pointer to dentry of the base directory
+ * @mode:	mode of the new tmpfile
+ * @open_flags:	flags
+ *
+ * Create a temporary file.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
+ */
+struct dentry *vfs_tmpfile(struct user_namespace *mnt_userns,
+			   struct dentry *dentry, umode_t mode, int open_flag)
 {
 	struct dentry *child = NULL;
 	struct inode *dir = dentry->d_inode;
@@ -3274,7 +3400,7 @@ struct dentry *vfs_tmpfile(struct dentry *dentry, umode_t mode, int open_flag)
 	int error;
 
 	/* we want directory to be writable */
-	error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
+	error = inode_permission(mnt_userns, dir, MAY_WRITE | MAY_EXEC);
 	if (error)
 		goto out_err;
 	error = -EOPNOTSUPP;
@@ -3284,7 +3410,7 @@ struct dentry *vfs_tmpfile(struct dentry *dentry, umode_t mode, int open_flag)
 	child = d_alloc(dentry, &slash_name);
 	if (unlikely(!child))
 		goto out_err;
-	error = dir->i_op->tmpfile(dir, child, mode);
+	error = dir->i_op->tmpfile(mnt_userns, dir, child, mode);
 	if (error)
 		goto out_err;
 	error = -ENOENT;
@@ -3296,7 +3422,7 @@ struct dentry *vfs_tmpfile(struct dentry *dentry, umode_t mode, int open_flag)
 		inode->i_state |= I_LINKABLE;
 		spin_unlock(&inode->i_lock);
 	}
-	ima_post_create_tmpfile(inode);
+	ima_post_create_tmpfile(mnt_userns, inode);
 	return child;
 
 out_err:
@@ -3309,6 +3435,7 @@ static int do_tmpfile(struct nameidata *nd, unsigned flags,
 		const struct open_flags *op,
 		struct file *file)
 {
+	struct user_namespace *mnt_userns;
 	struct dentry *child;
 	struct path path;
 	int error = path_lookupat(nd, flags | LOOKUP_DIRECTORY, &path);
@@ -3317,7 +3444,8 @@ static int do_tmpfile(struct nameidata *nd, unsigned flags,
 	error = mnt_want_write(path.mnt);
 	if (unlikely(error))
 		goto out;
-	child = vfs_tmpfile(path.dentry, op->mode, op->open_flag);
+	mnt_userns = mnt_user_ns(path.mnt);
+	child = vfs_tmpfile(mnt_userns, path.dentry, op->mode, op->open_flag);
 	error = PTR_ERR(child);
 	if (IS_ERR(child))
 		goto out2;
@@ -3325,7 +3453,7 @@ static int do_tmpfile(struct nameidata *nd, unsigned flags,
 	path.dentry = child;
 	audit_inode(nd->name, child, 0);
 	/* Don't check for other permissions, the inode was just created */
-	error = may_open(&path, 0, op->open_flag);
+	error = may_open(mnt_userns, &path, 0, op->open_flag);
 	if (!error)
 		error = vfs_open(&path, file);
 out2:
@@ -3527,10 +3655,27 @@ inline struct dentry *user_path_create(int dfd, const char __user *pathname,
 }
 EXPORT_SYMBOL(user_path_create);
 
-int vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
+/**
+ * vfs_mknod - create device node or file
+ * @mnt_userns:	user namespace of the mount the inode was found from
+ * @dir:	inode of @dentry
+ * @dentry:	pointer to dentry of the base directory
+ * @mode:	mode of the new device node or file
+ * @dev:	device number of device to create
+ *
+ * Create a device node or file.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
+ */
+int vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+	      struct dentry *dentry, umode_t mode, dev_t dev)
 {
 	bool is_whiteout = S_ISCHR(mode) && dev == WHITEOUT_DEV;
-	int error = may_create(dir, dentry);
+	int error = may_create(mnt_userns, dir, dentry);
 
 	if (error)
 		return error;
@@ -3550,7 +3695,7 @@ int vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
 	if (error)
 		return error;
 
-	error = dir->i_op->mknod(dir, dentry, mode, dev);
+	error = dir->i_op->mknod(mnt_userns, dir, dentry, mode, dev);
 	if (!error)
 		fsnotify_create(dir, dentry);
 	return error;
@@ -3577,6 +3722,7 @@ static int may_mknod(umode_t mode)
 static long do_mknodat(int dfd, const char __user *filename, umode_t mode,
 		unsigned int dev)
 {
+	struct user_namespace *mnt_userns;
 	struct dentry *dentry;
 	struct path path;
 	int error;
@@ -3595,18 +3741,22 @@ retry:
 	error = security_path_mknod(&path, dentry, mode, dev);
 	if (error)
 		goto out;
+
+	mnt_userns = mnt_user_ns(path.mnt);
 	switch (mode & S_IFMT) {
 		case 0: case S_IFREG:
-			error = vfs_create(path.dentry->d_inode,dentry,mode,true);
+			error = vfs_create(mnt_userns, path.dentry->d_inode,
+					   dentry, mode, true);
 			if (!error)
-				ima_post_path_mknod(dentry);
+				ima_post_path_mknod(mnt_userns, dentry);
 			break;
 		case S_IFCHR: case S_IFBLK:
-			error = vfs_mknod(path.dentry->d_inode,dentry,mode,
-					new_decode_dev(dev));
+			error = vfs_mknod(mnt_userns, path.dentry->d_inode,
+					  dentry, mode, new_decode_dev(dev));
 			break;
 		case S_IFIFO: case S_IFSOCK:
-			error = vfs_mknod(path.dentry->d_inode,dentry,mode,0);
+			error = vfs_mknod(mnt_userns, path.dentry->d_inode,
+					  dentry, mode, 0);
 			break;
 	}
 out:
@@ -3629,9 +3779,25 @@ SYSCALL_DEFINE3(mknod, const char __user *, filename, umode_t, mode, unsigned, d
 	return do_mknodat(AT_FDCWD, filename, mode, dev);
 }
 
-int vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+/**
+ * vfs_mkdir - create directory
+ * @mnt_userns:	user namespace of the mount the inode was found from
+ * @dir:	inode of @dentry
+ * @dentry:	pointer to dentry of the base directory
+ * @mode:	mode of the new directory
+ *
+ * Create a directory.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
+ */
+int vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+	      struct dentry *dentry, umode_t mode)
 {
-	int error = may_create(dir, dentry);
+	int error = may_create(mnt_userns, dir, dentry);
 	unsigned max_links = dir->i_sb->s_max_links;
 
 	if (error)
@@ -3648,7 +3814,7 @@ int vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 	if (max_links && dir->i_nlink >= max_links)
 		return -EMLINK;
 
-	error = dir->i_op->mkdir(dir, dentry, mode);
+	error = dir->i_op->mkdir(mnt_userns, dir, dentry, mode);
 	if (!error)
 		fsnotify_mkdir(dir, dentry);
 	return error;
@@ -3670,8 +3836,12 @@ retry:
 	if (!IS_POSIXACL(path.dentry->d_inode))
 		mode &= ~current_umask();
 	error = security_path_mkdir(&path, dentry, mode);
-	if (!error)
-		error = vfs_mkdir(path.dentry->d_inode, dentry, mode);
+	if (!error) {
+		struct user_namespace *mnt_userns;
+		mnt_userns = mnt_user_ns(path.mnt);
+		error = vfs_mkdir(mnt_userns, path.dentry->d_inode, dentry,
+				  mode);
+	}
 	done_path_create(&path, dentry);
 	if (retry_estale(error, lookup_flags)) {
 		lookup_flags |= LOOKUP_REVAL;
@@ -3690,9 +3860,24 @@ SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode)
 	return do_mkdirat(AT_FDCWD, pathname, mode);
 }
 
-int vfs_rmdir(struct inode *dir, struct dentry *dentry)
+/**
+ * vfs_rmdir - remove directory
+ * @mnt_userns:	user namespace of the mount the inode was found from
+ * @dir:	inode of @dentry
+ * @dentry:	pointer to dentry of the base directory
+ *
+ * Remove a directory.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
+ */
+int vfs_rmdir(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry)
 {
-	int error = may_delete(dir, dentry, 1);
+	int error = may_delete(mnt_userns, dir, dentry, 1);
 
 	if (error)
 		return error;
@@ -3732,6 +3917,7 @@ EXPORT_SYMBOL(vfs_rmdir);
 
 long do_rmdir(int dfd, struct filename *name)
 {
+	struct user_namespace *mnt_userns;
 	int error = 0;
 	struct dentry *dentry;
 	struct path path;
@@ -3772,7 +3958,8 @@ retry:
 	error = security_path_rmdir(&path, dentry);
 	if (error)
 		goto exit3;
-	error = vfs_rmdir(path.dentry->d_inode, dentry);
+	mnt_userns = mnt_user_ns(path.mnt);
+	error = vfs_rmdir(mnt_userns, path.dentry->d_inode, dentry);
 exit3:
 	dput(dentry);
 exit2:
@@ -3795,6 +3982,7 @@ SYSCALL_DEFINE1(rmdir, const char __user *, pathname)
 
 /**
  * vfs_unlink - unlink a filesystem object
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @dir:	parent directory
  * @dentry:	victim
  * @delegated_inode: returns victim inode, if the inode is delegated.
@@ -3810,11 +3998,18 @@ SYSCALL_DEFINE1(rmdir, const char __user *, pathname)
  * Alternatively, a caller may pass NULL for delegated_inode.  This may
  * be appropriate for callers that expect the underlying filesystem not
  * to be NFS exported.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
  */
-int vfs_unlink(struct inode *dir, struct dentry *dentry, struct inode **delegated_inode)
+int vfs_unlink(struct user_namespace *mnt_userns, struct inode *dir,
+	       struct dentry *dentry, struct inode **delegated_inode)
 {
 	struct inode *target = dentry->d_inode;
-	int error = may_delete(dir, dentry, 0);
+	int error = may_delete(mnt_userns, dir, dentry, 0);
 
 	if (error)
 		return error;
@@ -3885,6 +4080,8 @@ retry_deleg:
 	dentry = __lookup_hash(&last, path.dentry, lookup_flags);
 	error = PTR_ERR(dentry);
 	if (!IS_ERR(dentry)) {
+		struct user_namespace *mnt_userns;
+
 		/* Why not before? Because we want correct error value */
 		if (last.name[last.len])
 			goto slashes;
@@ -3895,7 +4092,9 @@ retry_deleg:
 		error = security_path_unlink(&path, dentry);
 		if (error)
 			goto exit2;
-		error = vfs_unlink(path.dentry->d_inode, dentry, &delegated_inode);
+		mnt_userns = mnt_user_ns(path.mnt);
+		error = vfs_unlink(mnt_userns, path.dentry->d_inode, dentry,
+				   &delegated_inode);
 exit2:
 		dput(dentry);
 	}
@@ -3944,9 +4143,25 @@ SYSCALL_DEFINE1(unlink, const char __user *, pathname)
 	return do_unlinkat(AT_FDCWD, getname(pathname));
 }
 
-int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname)
+/**
+ * vfs_symlink - create symlink
+ * @mnt_userns:	user namespace of the mount the inode was found from
+ * @dir:	inode of @dentry
+ * @dentry:	pointer to dentry of the base directory
+ * @oldname:	name of the file to link to
+ *
+ * Create a symlink.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
+ */
+int vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+		struct dentry *dentry, const char *oldname)
 {
-	int error = may_create(dir, dentry);
+	int error = may_create(mnt_userns, dir, dentry);
 
 	if (error)
 		return error;
@@ -3958,7 +4173,7 @@ int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname)
 	if (error)
 		return error;
 
-	error = dir->i_op->symlink(dir, dentry, oldname);
+	error = dir->i_op->symlink(mnt_userns, dir, dentry, oldname);
 	if (!error)
 		fsnotify_create(dir, dentry);
 	return error;
@@ -3984,8 +4199,13 @@ retry:
 		goto out_putname;
 
 	error = security_path_symlink(&path, dentry, from->name);
-	if (!error)
-		error = vfs_symlink(path.dentry->d_inode, dentry, from->name);
+	if (!error) {
+		struct user_namespace *mnt_userns;
+
+		mnt_userns = mnt_user_ns(path.mnt);
+		error = vfs_symlink(mnt_userns, path.dentry->d_inode, dentry,
+				    from->name);
+	}
 	done_path_create(&path, dentry);
 	if (retry_estale(error, lookup_flags)) {
 		lookup_flags |= LOOKUP_REVAL;
@@ -4010,6 +4230,7 @@ SYSCALL_DEFINE2(symlink, const char __user *, oldname, const char __user *, newn
 /**
  * vfs_link - create a new link
  * @old_dentry:	object to be linked
+ * @mnt_userns:	the user namespace of the mount
  * @dir:	new parent
  * @new_dentry:	where to create the new link
  * @delegated_inode: returns inode needing a delegation break
@@ -4025,8 +4246,16 @@ SYSCALL_DEFINE2(symlink, const char __user *, oldname, const char __user *, newn
  * Alternatively, a caller may pass NULL for delegated_inode.  This may
  * be appropriate for callers that expect the underlying filesystem not
  * to be NFS exported.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
  */
-int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry, struct inode **delegated_inode)
+int vfs_link(struct dentry *old_dentry, struct user_namespace *mnt_userns,
+	     struct inode *dir, struct dentry *new_dentry,
+	     struct inode **delegated_inode)
 {
 	struct inode *inode = old_dentry->d_inode;
 	unsigned max_links = dir->i_sb->s_max_links;
@@ -4035,7 +4264,7 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
 	if (!inode)
 		return -ENOENT;
 
-	error = may_create(dir, new_dentry);
+	error = may_create(mnt_userns, dir, new_dentry);
 	if (error)
 		return error;
 
@@ -4052,7 +4281,7 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
 	 * be writen back improperly if their true value is unknown to
 	 * the vfs.
 	 */
-	if (HAS_UNMAPPED_ID(inode))
+	if (HAS_UNMAPPED_ID(mnt_userns, inode))
 		return -EPERM;
 	if (!dir->i_op->link)
 		return -EPERM;
@@ -4099,6 +4328,7 @@ EXPORT_SYMBOL(vfs_link);
 static int do_linkat(int olddfd, const char __user *oldname, int newdfd,
 	      const char __user *newname, int flags)
 {
+	struct user_namespace *mnt_userns;
 	struct dentry *new_dentry;
 	struct path old_path, new_path;
 	struct inode *delegated_inode = NULL;
@@ -4134,13 +4364,15 @@ retry:
 	error = -EXDEV;
 	if (old_path.mnt != new_path.mnt)
 		goto out_dput;
-	error = may_linkat(&old_path);
+	mnt_userns = mnt_user_ns(new_path.mnt);
+	error = may_linkat(mnt_userns, &old_path);
 	if (unlikely(error))
 		goto out_dput;
 	error = security_path_link(old_path.dentry, &new_path, new_dentry);
 	if (error)
 		goto out_dput;
-	error = vfs_link(old_path.dentry, new_path.dentry->d_inode, new_dentry, &delegated_inode);
+	error = vfs_link(old_path.dentry, mnt_userns, new_path.dentry->d_inode,
+			 new_dentry, &delegated_inode);
 out_dput:
 	done_path_create(&new_path, new_dentry);
 	if (delegated_inode) {
@@ -4174,12 +4406,14 @@ SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname
 
 /**
  * vfs_rename - rename a filesystem object
- * @old_dir:	parent of source
- * @old_dentry:	source
- * @new_dir:	parent of destination
- * @new_dentry:	destination
- * @delegated_inode: returns an inode needing a delegation break
- * @flags:	rename flags
+ * @old_mnt_userns:	old user namespace of the mount the inode was found from
+ * @old_dir:		parent of source
+ * @old_dentry:		source
+ * @new_mnt_userns:	new user namespace of the mount the inode was found from
+ * @new_dir:		parent of destination
+ * @new_dentry:		destination
+ * @delegated_inode:	returns an inode needing a delegation break
+ * @flags:		rename flags
  *
  * The caller must hold multiple mutexes--see lock_rename()).
  *
@@ -4222,11 +4456,14 @@ SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname
  *	   ->i_mutex on parents, which works but leads to some truly excessive
  *	   locking].
  */
-int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
-	       struct inode *new_dir, struct dentry *new_dentry,
-	       struct inode **delegated_inode, unsigned int flags)
+int vfs_rename(struct renamedata *rd)
 {
 	int error;
+	struct inode *old_dir = rd->old_dir, *new_dir = rd->new_dir;
+	struct dentry *old_dentry = rd->old_dentry;
+	struct dentry *new_dentry = rd->new_dentry;
+	struct inode **delegated_inode = rd->delegated_inode;
+	unsigned int flags = rd->flags;
 	bool is_dir = d_is_dir(old_dentry);
 	struct inode *source = old_dentry->d_inode;
 	struct inode *target = new_dentry->d_inode;
@@ -4237,19 +4474,21 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	if (source == target)
 		return 0;
 
-	error = may_delete(old_dir, old_dentry, is_dir);
+	error = may_delete(rd->old_mnt_userns, old_dir, old_dentry, is_dir);
 	if (error)
 		return error;
 
 	if (!target) {
-		error = may_create(new_dir, new_dentry);
+		error = may_create(rd->new_mnt_userns, new_dir, new_dentry);
 	} else {
 		new_is_dir = d_is_dir(new_dentry);
 
 		if (!(flags & RENAME_EXCHANGE))
-			error = may_delete(new_dir, new_dentry, is_dir);
+			error = may_delete(rd->new_mnt_userns, new_dir,
+					   new_dentry, is_dir);
 		else
-			error = may_delete(new_dir, new_dentry, new_is_dir);
+			error = may_delete(rd->new_mnt_userns, new_dir,
+					   new_dentry, new_is_dir);
 	}
 	if (error)
 		return error;
@@ -4263,12 +4502,14 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	 */
 	if (new_dir != old_dir) {
 		if (is_dir) {
-			error = inode_permission(source, MAY_WRITE);
+			error = inode_permission(rd->old_mnt_userns, source,
+						 MAY_WRITE);
 			if (error)
 				return error;
 		}
 		if ((flags & RENAME_EXCHANGE) && new_is_dir) {
-			error = inode_permission(target, MAY_WRITE);
+			error = inode_permission(rd->new_mnt_userns, target,
+						 MAY_WRITE);
 			if (error)
 				return error;
 		}
@@ -4308,8 +4549,8 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 		if (error)
 			goto out;
 	}
-	error = old_dir->i_op->rename(old_dir, old_dentry,
-				       new_dir, new_dentry, flags);
+	error = old_dir->i_op->rename(rd->new_mnt_userns, old_dir, old_dentry,
+				      new_dir, new_dentry, flags);
 	if (error)
 		goto out;
 
@@ -4350,6 +4591,7 @@ EXPORT_SYMBOL(vfs_rename);
 int do_renameat2(int olddfd, struct filename *from, int newdfd,
 		 struct filename *to, unsigned int flags)
 {
+	struct renamedata rd;
 	struct dentry *old_dentry, *new_dentry;
 	struct dentry *trap;
 	struct path old_path, new_path;
@@ -4453,9 +4695,16 @@ retry_deleg:
 				     &new_path, new_dentry, flags);
 	if (error)
 		goto exit5;
-	error = vfs_rename(old_path.dentry->d_inode, old_dentry,
-			   new_path.dentry->d_inode, new_dentry,
-			   &delegated_inode, flags);
+
+	rd.old_dir	   = old_path.dentry->d_inode;
+	rd.old_dentry	   = old_dentry;
+	rd.old_mnt_userns  = mnt_user_ns(old_path.mnt);
+	rd.new_dir	   = new_path.dentry->d_inode;
+	rd.new_dentry	   = new_dentry;
+	rd.new_mnt_userns  = mnt_user_ns(new_path.mnt);
+	rd.delegated_inode = &delegated_inode;
+	rd.flags	   = flags;
+	error = vfs_rename(&rd);
 exit5:
 	dput(new_dentry);
 exit4:
diff --git a/fs/namespace.c b/fs/namespace.c
index 9d33909d0f9e..062fe984a697 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -25,6 +25,7 @@
 #include <linux/proc_ns.h>
 #include <linux/magic.h>
 #include <linux/memblock.h>
+#include <linux/proc_fs.h>
 #include <linux/task_work.h>
 #include <linux/sched/task.h>
 #include <uapi/linux/mount.h>
@@ -73,6 +74,15 @@ static DECLARE_RWSEM(namespace_sem);
 static HLIST_HEAD(unmounted);	/* protected by namespace_sem */
 static LIST_HEAD(ex_mountpoints); /* protected by namespace_sem */
 
+struct mount_kattr {
+	unsigned int attr_set;
+	unsigned int attr_clr;
+	unsigned int propagation;
+	unsigned int lookup_flags;
+	bool recurse;
+	struct user_namespace *mnt_userns;
+};
+
 /* /sys/fs */
 struct kobject *fs_kobj;
 EXPORT_SYMBOL_GPL(fs_kobj);
@@ -87,6 +97,16 @@ EXPORT_SYMBOL_GPL(fs_kobj);
  */
 __cacheline_aligned_in_smp DEFINE_SEQLOCK(mount_lock);
 
+static inline void lock_mount_hash(void)
+{
+	write_seqlock(&mount_lock);
+}
+
+static inline void unlock_mount_hash(void)
+{
+	write_sequnlock(&mount_lock);
+}
+
 static inline struct hlist_head *m_hash(struct vfsmount *mnt, struct dentry *dentry)
 {
 	unsigned long tmp = ((unsigned long)mnt / L1_CACHE_BYTES);
@@ -210,6 +230,7 @@ static struct mount *alloc_vfsmnt(const char *name)
 		INIT_HLIST_NODE(&mnt->mnt_mp_list);
 		INIT_LIST_HEAD(&mnt->mnt_umounting);
 		INIT_HLIST_HEAD(&mnt->mnt_stuck_children);
+		mnt->mnt.mnt_userns = &init_user_ns;
 	}
 	return mnt;
 
@@ -459,11 +480,8 @@ void mnt_drop_write_file(struct file *file)
 }
 EXPORT_SYMBOL(mnt_drop_write_file);
 
-static int mnt_make_readonly(struct mount *mnt)
+static inline int mnt_hold_writers(struct mount *mnt)
 {
-	int ret = 0;
-
-	lock_mount_hash();
 	mnt->mnt.mnt_flags |= MNT_WRITE_HOLD;
 	/*
 	 * After storing MNT_WRITE_HOLD, we'll read the counters. This store
@@ -488,25 +506,30 @@ static int mnt_make_readonly(struct mount *mnt)
 	 * we're counting up here.
 	 */
 	if (mnt_get_writers(mnt) > 0)
-		ret = -EBUSY;
-	else
-		mnt->mnt.mnt_flags |= MNT_READONLY;
+		return -EBUSY;
+
+	return 0;
+}
+
+static inline void mnt_unhold_writers(struct mount *mnt)
+{
 	/*
 	 * MNT_READONLY must become visible before ~MNT_WRITE_HOLD, so writers
 	 * that become unheld will see MNT_READONLY.
 	 */
 	smp_wmb();
 	mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD;
-	unlock_mount_hash();
-	return ret;
 }
 
-static int __mnt_unmake_readonly(struct mount *mnt)
+static int mnt_make_readonly(struct mount *mnt)
 {
-	lock_mount_hash();
-	mnt->mnt.mnt_flags &= ~MNT_READONLY;
-	unlock_mount_hash();
-	return 0;
+	int ret;
+
+	ret = mnt_hold_writers(mnt);
+	if (!ret)
+		mnt->mnt.mnt_flags |= MNT_READONLY;
+	mnt_unhold_writers(mnt);
+	return ret;
 }
 
 int sb_prepare_remount_readonly(struct super_block *sb)
@@ -547,6 +570,11 @@ int sb_prepare_remount_readonly(struct super_block *sb)
 
 static void free_vfsmnt(struct mount *mnt)
 {
+	struct user_namespace *mnt_userns;
+
+	mnt_userns = mnt_user_ns(&mnt->mnt);
+	if (mnt_userns != &init_user_ns)
+		put_user_ns(mnt_userns);
 	kfree_const(mnt->mnt_devname);
 #ifdef CONFIG_SMP
 	free_percpu(mnt->mnt_pcp);
@@ -1055,6 +1083,9 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
 	mnt->mnt.mnt_flags &= ~(MNT_WRITE_HOLD|MNT_MARKED|MNT_INTERNAL);
 
 	atomic_inc(&sb->s_active);
+	mnt->mnt.mnt_userns = mnt_user_ns(&old->mnt);
+	if (mnt->mnt.mnt_userns != &init_user_ns)
+		mnt->mnt.mnt_userns = get_user_ns(mnt->mnt.mnt_userns);
 	mnt->mnt.mnt_sb = sb;
 	mnt->mnt.mnt_root = dget(root);
 	mnt->mnt_mountpoint = mnt->mnt.mnt_root;
@@ -2514,20 +2545,15 @@ static int change_mount_ro_state(struct mount *mnt, unsigned int mnt_flags)
 	if (readonly_request)
 		return mnt_make_readonly(mnt);
 
-	return __mnt_unmake_readonly(mnt);
+	mnt->mnt.mnt_flags &= ~MNT_READONLY;
+	return 0;
 }
 
-/*
- * Update the user-settable attributes on a mount.  The caller must hold
- * sb->s_umount for writing.
- */
 static void set_mount_attributes(struct mount *mnt, unsigned int mnt_flags)
 {
-	lock_mount_hash();
 	mnt_flags |= mnt->mnt.mnt_flags & ~MNT_USER_SETTABLE_MASK;
 	mnt->mnt.mnt_flags = mnt_flags;
 	touch_mnt_namespace(mnt->mnt_ns);
-	unlock_mount_hash();
 }
 
 static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *mnt)
@@ -2572,11 +2598,17 @@ static int do_reconfigure_mnt(struct path *path, unsigned int mnt_flags)
 	if (!can_change_locked_flags(mnt, mnt_flags))
 		return -EPERM;
 
-	down_write(&sb->s_umount);
+	/*
+	 * We're only checking whether the superblock is read-only not
+	 * changing it, so only take down_read(&sb->s_umount).
+	 */
+	down_read(&sb->s_umount);
+	lock_mount_hash();
 	ret = change_mount_ro_state(mnt, mnt_flags);
 	if (ret == 0)
 		set_mount_attributes(mnt, mnt_flags);
-	up_write(&sb->s_umount);
+	unlock_mount_hash();
+	up_read(&sb->s_umount);
 
 	mnt_warn_timestamp_expiry(path, &mnt->mnt);
 
@@ -2616,8 +2648,11 @@ static int do_remount(struct path *path, int ms_flags, int sb_flags,
 		err = -EPERM;
 		if (ns_capable(sb->s_user_ns, CAP_SYS_ADMIN)) {
 			err = reconfigure_super(fc);
-			if (!err)
+			if (!err) {
+				lock_mount_hash();
 				set_mount_attributes(mnt, mnt_flags);
+				unlock_mount_hash();
+			}
 		}
 		up_write(&sb->s_umount);
 	}
@@ -3440,6 +3475,33 @@ out_type:
 	return ret;
 }
 
+#define FSMOUNT_VALID_FLAGS \
+	(MOUNT_ATTR_RDONLY | MOUNT_ATTR_NOSUID | MOUNT_ATTR_NODEV | \
+	 MOUNT_ATTR_NOEXEC | MOUNT_ATTR__ATIME | MOUNT_ATTR_NODIRATIME)
+
+#define MOUNT_SETATTR_VALID_FLAGS (FSMOUNT_VALID_FLAGS | MOUNT_ATTR_IDMAP)
+
+#define MOUNT_SETATTR_PROPAGATION_FLAGS \
+	(MS_UNBINDABLE | MS_PRIVATE | MS_SLAVE | MS_SHARED)
+
+static unsigned int attr_flags_to_mnt_flags(u64 attr_flags)
+{
+	unsigned int mnt_flags = 0;
+
+	if (attr_flags & MOUNT_ATTR_RDONLY)
+		mnt_flags |= MNT_READONLY;
+	if (attr_flags & MOUNT_ATTR_NOSUID)
+		mnt_flags |= MNT_NOSUID;
+	if (attr_flags & MOUNT_ATTR_NODEV)
+		mnt_flags |= MNT_NODEV;
+	if (attr_flags & MOUNT_ATTR_NOEXEC)
+		mnt_flags |= MNT_NOEXEC;
+	if (attr_flags & MOUNT_ATTR_NODIRATIME)
+		mnt_flags |= MNT_NODIRATIME;
+
+	return mnt_flags;
+}
+
 /*
  * Create a kernel mount representation for a new, prepared superblock
  * (specified by fs_fd) and attach to an open_tree-like file descriptor.
@@ -3462,24 +3524,10 @@ SYSCALL_DEFINE3(fsmount, int, fs_fd, unsigned int, flags,
 	if ((flags & ~(FSMOUNT_CLOEXEC)) != 0)
 		return -EINVAL;
 
-	if (attr_flags & ~(MOUNT_ATTR_RDONLY |
-			   MOUNT_ATTR_NOSUID |
-			   MOUNT_ATTR_NODEV |
-			   MOUNT_ATTR_NOEXEC |
-			   MOUNT_ATTR__ATIME |
-			   MOUNT_ATTR_NODIRATIME))
+	if (attr_flags & ~FSMOUNT_VALID_FLAGS)
 		return -EINVAL;
 
-	if (attr_flags & MOUNT_ATTR_RDONLY)
-		mnt_flags |= MNT_READONLY;
-	if (attr_flags & MOUNT_ATTR_NOSUID)
-		mnt_flags |= MNT_NOSUID;
-	if (attr_flags & MOUNT_ATTR_NODEV)
-		mnt_flags |= MNT_NODEV;
-	if (attr_flags & MOUNT_ATTR_NOEXEC)
-		mnt_flags |= MNT_NOEXEC;
-	if (attr_flags & MOUNT_ATTR_NODIRATIME)
-		mnt_flags |= MNT_NODIRATIME;
+	mnt_flags = attr_flags_to_mnt_flags(attr_flags);
 
 	switch (attr_flags & MOUNT_ATTR__ATIME) {
 	case MOUNT_ATTR_STRICTATIME:
@@ -3787,6 +3835,362 @@ out0:
 	return error;
 }
 
+static unsigned int recalc_flags(struct mount_kattr *kattr, struct mount *mnt)
+{
+	unsigned int flags = mnt->mnt.mnt_flags;
+
+	/*  flags to clear */
+	flags &= ~kattr->attr_clr;
+	/* flags to raise */
+	flags |= kattr->attr_set;
+
+	return flags;
+}
+
+static int can_idmap_mount(const struct mount_kattr *kattr, struct mount *mnt)
+{
+	struct vfsmount *m = &mnt->mnt;
+
+	if (!kattr->mnt_userns)
+		return 0;
+
+	/*
+	 * Once a mount has been idmapped we don't allow it to change its
+	 * mapping. It makes things simpler and callers can just create
+	 * another bind-mount they can idmap if they want to.
+	 */
+	if (mnt_user_ns(m) != &init_user_ns)
+		return -EPERM;
+
+	/* The underlying filesystem doesn't support idmapped mounts yet. */
+	if (!(m->mnt_sb->s_type->fs_flags & FS_ALLOW_IDMAP))
+		return -EINVAL;
+
+	/* We're not controlling the superblock. */
+	if (!ns_capable(m->mnt_sb->s_user_ns, CAP_SYS_ADMIN))
+		return -EPERM;
+
+	/* Mount has already been visible in the filesystem hierarchy. */
+	if (!is_anon_ns(mnt->mnt_ns))
+		return -EINVAL;
+
+	return 0;
+}
+
+static struct mount *mount_setattr_prepare(struct mount_kattr *kattr,
+					   struct mount *mnt, int *err)
+{
+	struct mount *m = mnt, *last = NULL;
+
+	if (!is_mounted(&m->mnt)) {
+		*err = -EINVAL;
+		goto out;
+	}
+
+	if (!(mnt_has_parent(m) ? check_mnt(m) : is_anon_ns(m->mnt_ns))) {
+		*err = -EINVAL;
+		goto out;
+	}
+
+	do {
+		unsigned int flags;
+
+		flags = recalc_flags(kattr, m);
+		if (!can_change_locked_flags(m, flags)) {
+			*err = -EPERM;
+			goto out;
+		}
+
+		*err = can_idmap_mount(kattr, m);
+		if (*err)
+			goto out;
+
+		last = m;
+
+		if ((kattr->attr_set & MNT_READONLY) &&
+		    !(m->mnt.mnt_flags & MNT_READONLY)) {
+			*err = mnt_hold_writers(m);
+			if (*err)
+				goto out;
+		}
+	} while (kattr->recurse && (m = next_mnt(m, mnt)));
+
+out:
+	return last;
+}
+
+static void do_idmap_mount(const struct mount_kattr *kattr, struct mount *mnt)
+{
+	struct user_namespace *mnt_userns;
+
+	if (!kattr->mnt_userns)
+		return;
+
+	mnt_userns = get_user_ns(kattr->mnt_userns);
+	/* Pairs with smp_load_acquire() in mnt_user_ns(). */
+	smp_store_release(&mnt->mnt.mnt_userns, mnt_userns);
+}
+
+static void mount_setattr_commit(struct mount_kattr *kattr,
+				 struct mount *mnt, struct mount *last,
+				 int err)
+{
+	struct mount *m = mnt;
+
+	do {
+		if (!err) {
+			unsigned int flags;
+
+			do_idmap_mount(kattr, m);
+			flags = recalc_flags(kattr, m);
+			WRITE_ONCE(m->mnt.mnt_flags, flags);
+		}
+
+		/*
+		 * We either set MNT_READONLY above so make it visible
+		 * before ~MNT_WRITE_HOLD or we failed to recursively
+		 * apply mount options.
+		 */
+		if ((kattr->attr_set & MNT_READONLY) &&
+		    (m->mnt.mnt_flags & MNT_WRITE_HOLD))
+			mnt_unhold_writers(m);
+
+		if (!err && kattr->propagation)
+			change_mnt_propagation(m, kattr->propagation);
+
+		/*
+		 * On failure, only cleanup until we found the first mount
+		 * we failed to handle.
+		 */
+		if (err && m == last)
+			break;
+	} while (kattr->recurse && (m = next_mnt(m, mnt)));
+
+	if (!err)
+		touch_mnt_namespace(mnt->mnt_ns);
+}
+
+static int do_mount_setattr(struct path *path, struct mount_kattr *kattr)
+{
+	struct mount *mnt = real_mount(path->mnt), *last = NULL;
+	int err = 0;
+
+	if (path->dentry != mnt->mnt.mnt_root)
+		return -EINVAL;
+
+	if (kattr->propagation) {
+		/*
+		 * Only take namespace_lock() if we're actually changing
+		 * propagation.
+		 */
+		namespace_lock();
+		if (kattr->propagation == MS_SHARED) {
+			err = invent_group_ids(mnt, kattr->recurse);
+			if (err) {
+				namespace_unlock();
+				return err;
+			}
+		}
+	}
+
+	lock_mount_hash();
+
+	/*
+	 * Get the mount tree in a shape where we can change mount
+	 * properties without failure.
+	 */
+	last = mount_setattr_prepare(kattr, mnt, &err);
+	if (last) /* Commit all changes or revert to the old state. */
+		mount_setattr_commit(kattr, mnt, last, err);
+
+	unlock_mount_hash();
+
+	if (kattr->propagation) {
+		namespace_unlock();
+		if (err)
+			cleanup_group_ids(mnt, NULL);
+	}
+
+	return err;
+}
+
+static int build_mount_idmapped(const struct mount_attr *attr, size_t usize,
+				struct mount_kattr *kattr, unsigned int flags)
+{
+	int err = 0;
+	struct ns_common *ns;
+	struct user_namespace *mnt_userns;
+	struct file *file;
+
+	if (!((attr->attr_set | attr->attr_clr) & MOUNT_ATTR_IDMAP))
+		return 0;
+
+	/*
+	 * We currently do not support clearing an idmapped mount. If this ever
+	 * is a use-case we can revisit this but for now let's keep it simple
+	 * and not allow it.
+	 */
+	if (attr->attr_clr & MOUNT_ATTR_IDMAP)
+		return -EINVAL;
+
+	if (attr->userns_fd > INT_MAX)
+		return -EINVAL;
+
+	file = fget(attr->userns_fd);
+	if (!file)
+		return -EBADF;
+
+	if (!proc_ns_file(file)) {
+		err = -EINVAL;
+		goto out_fput;
+	}
+
+	ns = get_proc_ns(file_inode(file));
+	if (ns->ops->type != CLONE_NEWUSER) {
+		err = -EINVAL;
+		goto out_fput;
+	}
+
+	/*
+	 * The init_user_ns is used to indicate that a vfsmount is not idmapped.
+	 * This is simpler than just having to treat NULL as unmapped. Users
+	 * wanting to idmap a mount to init_user_ns can just use a namespace
+	 * with an identity mapping.
+	 */
+	mnt_userns = container_of(ns, struct user_namespace, ns);
+	if (mnt_userns == &init_user_ns) {
+		err = -EPERM;
+		goto out_fput;
+	}
+	kattr->mnt_userns = get_user_ns(mnt_userns);
+
+out_fput:
+	fput(file);
+	return err;
+}
+
+static int build_mount_kattr(const struct mount_attr *attr, size_t usize,
+			     struct mount_kattr *kattr, unsigned int flags)
+{
+	unsigned int lookup_flags = LOOKUP_AUTOMOUNT | LOOKUP_FOLLOW;
+
+	if (flags & AT_NO_AUTOMOUNT)
+		lookup_flags &= ~LOOKUP_AUTOMOUNT;
+	if (flags & AT_SYMLINK_NOFOLLOW)
+		lookup_flags &= ~LOOKUP_FOLLOW;
+	if (flags & AT_EMPTY_PATH)
+		lookup_flags |= LOOKUP_EMPTY;
+
+	*kattr = (struct mount_kattr) {
+		.lookup_flags	= lookup_flags,
+		.recurse	= !!(flags & AT_RECURSIVE),
+	};
+
+	if (attr->propagation & ~MOUNT_SETATTR_PROPAGATION_FLAGS)
+		return -EINVAL;
+	if (hweight32(attr->propagation & MOUNT_SETATTR_PROPAGATION_FLAGS) > 1)
+		return -EINVAL;
+	kattr->propagation = attr->propagation;
+
+	if ((attr->attr_set | attr->attr_clr) & ~MOUNT_SETATTR_VALID_FLAGS)
+		return -EINVAL;
+
+	kattr->attr_set = attr_flags_to_mnt_flags(attr->attr_set);
+	kattr->attr_clr = attr_flags_to_mnt_flags(attr->attr_clr);
+
+	/*
+	 * Since the MOUNT_ATTR_<atime> values are an enum, not a bitmap,
+	 * users wanting to transition to a different atime setting cannot
+	 * simply specify the atime setting in @attr_set, but must also
+	 * specify MOUNT_ATTR__ATIME in the @attr_clr field.
+	 * So ensure that MOUNT_ATTR__ATIME can't be partially set in
+	 * @attr_clr and that @attr_set can't have any atime bits set if
+	 * MOUNT_ATTR__ATIME isn't set in @attr_clr.
+	 */
+	if (attr->attr_clr & MOUNT_ATTR__ATIME) {
+		if ((attr->attr_clr & MOUNT_ATTR__ATIME) != MOUNT_ATTR__ATIME)
+			return -EINVAL;
+
+		/*
+		 * Clear all previous time settings as they are mutually
+		 * exclusive.
+		 */
+		kattr->attr_clr |= MNT_RELATIME | MNT_NOATIME;
+		switch (attr->attr_set & MOUNT_ATTR__ATIME) {
+		case MOUNT_ATTR_RELATIME:
+			kattr->attr_set |= MNT_RELATIME;
+			break;
+		case MOUNT_ATTR_NOATIME:
+			kattr->attr_set |= MNT_NOATIME;
+			break;
+		case MOUNT_ATTR_STRICTATIME:
+			break;
+		default:
+			return -EINVAL;
+		}
+	} else {
+		if (attr->attr_set & MOUNT_ATTR__ATIME)
+			return -EINVAL;
+	}
+
+	return build_mount_idmapped(attr, usize, kattr, flags);
+}
+
+static void finish_mount_kattr(struct mount_kattr *kattr)
+{
+	put_user_ns(kattr->mnt_userns);
+	kattr->mnt_userns = NULL;
+}
+
+SYSCALL_DEFINE5(mount_setattr, int, dfd, const char __user *, path,
+		unsigned int, flags, struct mount_attr __user *, uattr,
+		size_t, usize)
+{
+	int err;
+	struct path target;
+	struct mount_attr attr;
+	struct mount_kattr kattr;
+
+	BUILD_BUG_ON(sizeof(struct mount_attr) != MOUNT_ATTR_SIZE_VER0);
+
+	if (flags & ~(AT_EMPTY_PATH |
+		      AT_RECURSIVE |
+		      AT_SYMLINK_NOFOLLOW |
+		      AT_NO_AUTOMOUNT))
+		return -EINVAL;
+
+	if (unlikely(usize > PAGE_SIZE))
+		return -E2BIG;
+	if (unlikely(usize < MOUNT_ATTR_SIZE_VER0))
+		return -EINVAL;
+
+	if (!may_mount())
+		return -EPERM;
+
+	err = copy_struct_from_user(&attr, sizeof(attr), uattr, usize);
+	if (err)
+		return err;
+
+	/* Don't bother walking through the mounts if this is a nop. */
+	if (attr.attr_set == 0 &&
+	    attr.attr_clr == 0 &&
+	    attr.propagation == 0)
+		return 0;
+
+	err = build_mount_kattr(&attr, usize, &kattr, flags);
+	if (err)
+		return err;
+
+	err = user_path_at(dfd, path, kattr.lookup_flags, &target);
+	if (err)
+		return err;
+
+	err = do_mount_setattr(&target, &kattr);
+	finish_mount_kattr(&kattr);
+	path_put(&target);
+	return err;
+}
+
 static void __init init_mount_tree(void)
 {
 	struct vfsmount *mnt;
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index ef827ae193d2..19a9f434442f 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2095,8 +2095,8 @@ EXPORT_SYMBOL_GPL(nfs_instantiate);
  * that the operation succeeded on the server, but an error in the
  * reply path made it appear to have failed.
  */
-int nfs_create(struct inode *dir, struct dentry *dentry,
-		umode_t mode, bool excl)
+int nfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+	       struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct iattr attr;
 	int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT;
@@ -2124,7 +2124,8 @@ EXPORT_SYMBOL_GPL(nfs_create);
  * See comments for nfs_proc_create regarding failed operations.
  */
 int
-nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
+nfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+	  struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct iattr attr;
 	int status;
@@ -2150,7 +2151,8 @@ EXPORT_SYMBOL_GPL(nfs_mknod);
 /*
  * See comments for nfs_proc_create regarding failed operations.
  */
-int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+int nfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+	      struct dentry *dentry, umode_t mode)
 {
 	struct iattr attr;
 	int error;
@@ -2295,7 +2297,8 @@ EXPORT_SYMBOL_GPL(nfs_unlink);
  * now have a new file handle and can instantiate an in-core NFS inode
  * and move the raw page into its mapping.
  */
-int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
+int nfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+		struct dentry *dentry, const char *symname)
 {
 	struct page *page;
 	char *kaddr;
@@ -2398,9 +2401,9 @@ EXPORT_SYMBOL_GPL(nfs_link);
  * If these conditions are met, we can drop the dentries before doing
  * the rename.
  */
-int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
-	       struct inode *new_dir, struct dentry *new_dentry,
-	       unsigned int flags)
+int nfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+	       struct dentry *old_dentry, struct inode *new_dir,
+	       struct dentry *new_dentry, unsigned int flags)
 {
 	struct inode *old_inode = d_inode(old_dentry);
 	struct inode *new_inode = d_inode(new_dentry);
@@ -2939,7 +2942,9 @@ static int nfs_execute_ok(struct inode *inode, int mask)
 	return ret;
 }
 
-int nfs_permission(struct inode *inode, int mask)
+int nfs_permission(struct user_namespace *mnt_userns,
+		   struct inode *inode,
+		   int mask)
 {
 	const struct cred *cred = current_cred();
 	int res = 0;
@@ -2987,7 +2992,7 @@ out_notsup:
 
 	res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
 	if (res == 0)
-		res = generic_permission(inode, mask);
+		res = generic_permission(&init_user_ns, inode, mask);
 	goto out;
 }
 EXPORT_SYMBOL_GPL(nfs_permission);
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 522aa10a1a3e..447e95974386 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -594,7 +594,8 @@ EXPORT_SYMBOL_GPL(nfs_fhget);
 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
 
 int
-nfs_setattr(struct dentry *dentry, struct iattr *attr)
+nfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+	    struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct nfs_fattr *fattr;
@@ -787,8 +788,8 @@ static bool nfs_need_revalidate_inode(struct inode *inode)
 	return false;
 }
 
-int nfs_getattr(const struct path *path, struct kstat *stat,
-		u32 request_mask, unsigned int query_flags)
+int nfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		struct kstat *stat, u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct nfs_server *server = NFS_SERVER(inode);
@@ -857,7 +858,7 @@ out_no_revalidate:
 	/* Only return attributes that were revalidated. */
 	stat->result_mask &= request_mask;
 out_no_update:
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
 	if (S_ISDIR(inode->i_mode))
 		stat->blksize = NFS_SERVER(inode)->dtsize;
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 62d3189745cd..25fb43b69e5a 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -378,14 +378,18 @@ extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
 					   struct shrink_control *sc);
 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
-int nfs_create(struct inode *, struct dentry *, umode_t, bool);
-int nfs_mkdir(struct inode *, struct dentry *, umode_t);
+int nfs_create(struct user_namespace *, struct inode *, struct dentry *,
+	       umode_t, bool);
+int nfs_mkdir(struct user_namespace *, struct inode *, struct dentry *,
+	      umode_t);
 int nfs_rmdir(struct inode *, struct dentry *);
 int nfs_unlink(struct inode *, struct dentry *);
-int nfs_symlink(struct inode *, struct dentry *, const char *);
+int nfs_symlink(struct user_namespace *, struct inode *, struct dentry *,
+		const char *);
 int nfs_link(struct dentry *, struct inode *, struct dentry *);
-int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
-int nfs_rename(struct inode *, struct dentry *,
+int nfs_mknod(struct user_namespace *, struct inode *, struct dentry *, umode_t,
+	      dev_t);
+int nfs_rename(struct user_namespace *, struct inode *, struct dentry *,
 	       struct inode *, struct dentry *, unsigned int);
 
 /* file.c */
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 2bcbe38afe2e..93e60e921f92 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -208,20 +208,23 @@ out_fc:
 }
 
 static int
-nfs_namespace_getattr(const struct path *path, struct kstat *stat,
-			u32 request_mask, unsigned int query_flags)
+nfs_namespace_getattr(struct user_namespace *mnt_userns,
+		      const struct path *path, struct kstat *stat,
+		      u32 request_mask, unsigned int query_flags)
 {
 	if (NFS_FH(d_inode(path->dentry))->size != 0)
-		return nfs_getattr(path, stat, request_mask, query_flags);
-	generic_fillattr(d_inode(path->dentry), stat);
+		return nfs_getattr(mnt_userns, path, stat, request_mask,
+				   query_flags);
+	generic_fillattr(&init_user_ns, d_inode(path->dentry), stat);
 	return 0;
 }
 
 static int
-nfs_namespace_setattr(struct dentry *dentry, struct iattr *attr)
+nfs_namespace_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		      struct iattr *attr)
 {
 	if (NFS_FH(d_inode(dentry))->size != 0)
-		return nfs_setattr(dentry, attr);
+		return nfs_setattr(mnt_userns, dentry, attr);
 	return -EACCES;
 }
 
diff --git a/fs/nfs/nfs3_fs.h b/fs/nfs/nfs3_fs.h
index 1b950b66b3bb..c8a192802dda 100644
--- a/fs/nfs/nfs3_fs.h
+++ b/fs/nfs/nfs3_fs.h
@@ -12,7 +12,8 @@
  */
 #ifdef CONFIG_NFS_V3_ACL
 extern struct posix_acl *nfs3_get_acl(struct inode *inode, int type);
-extern int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+extern int nfs3_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+			struct posix_acl *acl, int type);
 extern int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
 		struct posix_acl *dfacl);
 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c
index c6c863382f37..5604e807fc01 100644
--- a/fs/nfs/nfs3acl.c
+++ b/fs/nfs/nfs3acl.c
@@ -251,7 +251,8 @@ int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
 
 }
 
-int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+int nfs3_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		 struct posix_acl *acl, int type)
 {
 	struct posix_acl *orig = acl, *dfacl = NULL, *alloc;
 	int status;
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 2f4679a62712..a07530cf673d 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7491,6 +7491,7 @@ nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
 
 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
+				   struct user_namespace *mnt_userns,
 				   struct dentry *unused, struct inode *inode,
 				   const char *key, const void *buf,
 				   size_t buflen, int flags)
@@ -7513,6 +7514,7 @@ static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 
 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
+				     struct user_namespace *mnt_userns,
 				     struct dentry *unused, struct inode *inode,
 				     const char *key, const void *buf,
 				     size_t buflen, int flags)
@@ -7563,6 +7565,7 @@ nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
 
 #ifdef CONFIG_NFS_V4_2
 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
+				    struct user_namespace *mnt_userns,
 				    struct dentry *unused, struct inode *inode,
 				    const char *key, const void *buf,
 				    size_t buflen, int flags)
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 7c863f2c21e0..9421dae22737 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -386,8 +386,9 @@ static struct svc_export *svc_export_update(struct svc_export *new,
 					    struct svc_export *old);
 static struct svc_export *svc_export_lookup(struct svc_export *);
 
-static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
+static int check_export(struct path *path, int *flags, unsigned char *uuid)
 {
+	struct inode *inode = d_inode(path->dentry);
 
 	/*
 	 * We currently export only dirs, regular files, and (for v4
@@ -411,6 +412,7 @@ static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
 	 *       or an FSID number (so NFSEXP_FSID or ->uuid is needed).
 	 * 2:  We must be able to find an inode from a filehandle.
 	 *       This means that s_export_op must be set.
+	 * 3: We must not currently be on an idmapped mount.
 	 */
 	if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
 	    !(*flags & NFSEXP_FSID) &&
@@ -425,6 +427,11 @@ static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
 		return -EINVAL;
 	}
 
+	if (mnt_user_ns(path->mnt) != &init_user_ns) {
+		dprintk("exp_export: export of idmapped mounts not yet supported.\n");
+		return -EINVAL;
+	}
+
 	if (inode->i_sb->s_export_op->flags & EXPORT_OP_NOSUBTREECHK &&
 	    !(*flags & NFSEXP_NOSUBTREECHECK)) {
 		dprintk("%s: %s does not support subtree checking!\n",
@@ -653,8 +660,7 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
 				goto out4;
 		}
 
-		err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
-				   exp.ex_uuid);
+		err = check_export(&exp.ex_path, &exp.ex_flags, exp.ex_uuid);
 		if (err)
 			goto out4;
 		/*
diff --git a/fs/nfsd/nfs2acl.c b/fs/nfsd/nfs2acl.c
index 7eeac5b81c20..855e17772eba 100644
--- a/fs/nfsd/nfs2acl.c
+++ b/fs/nfsd/nfs2acl.c
@@ -113,10 +113,12 @@ static __be32 nfsacld_proc_setacl(struct svc_rqst *rqstp)
 
 	fh_lock(fh);
 
-	error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
+	error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_ACCESS,
+			      argp->acl_access);
 	if (error)
 		goto out_drop_lock;
-	error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
+	error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_DEFAULT,
+			      argp->acl_default);
 	if (error)
 		goto out_drop_lock;
 
diff --git a/fs/nfsd/nfs3acl.c b/fs/nfsd/nfs3acl.c
index a568b842e9eb..9a6f18d74d14 100644
--- a/fs/nfsd/nfs3acl.c
+++ b/fs/nfsd/nfs3acl.c
@@ -103,10 +103,12 @@ static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp)
 
 	fh_lock(fh);
 
-	error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
+	error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_ACCESS,
+			      argp->acl_access);
 	if (error)
 		goto out_drop_lock;
-	error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
+	error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_DEFAULT,
+			      argp->acl_default);
 
 out_drop_lock:
 	fh_unlock(fh);
diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
index 71292a0d6f09..eaa3a0cf38f1 100644
--- a/fs/nfsd/nfs4acl.c
+++ b/fs/nfsd/nfs4acl.c
@@ -781,12 +781,13 @@ nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 
 	fh_lock(fhp);
 
-	host_error = set_posix_acl(inode, ACL_TYPE_ACCESS, pacl);
+	host_error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_ACCESS, pacl);
 	if (host_error < 0)
 		goto out_drop_lock;
 
 	if (S_ISDIR(inode->i_mode)) {
-		host_error = set_posix_acl(inode, ACL_TYPE_DEFAULT, dpacl);
+		host_error = set_posix_acl(&init_user_ns, inode,
+					   ACL_TYPE_DEFAULT, dpacl);
 	}
 
 out_drop_lock:
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 186fa2c2c6ba..891395c6c7d3 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -233,7 +233,7 @@ nfsd4_create_clid_dir(struct nfs4_client *clp)
 		 * as well be forgiving and just succeed silently.
 		 */
 		goto out_put;
-	status = vfs_mkdir(d_inode(dir), dentry, S_IRWXU);
+	status = vfs_mkdir(&init_user_ns, d_inode(dir), dentry, S_IRWXU);
 out_put:
 	dput(dentry);
 out_unlock:
@@ -353,7 +353,7 @@ nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
 	status = -ENOENT;
 	if (d_really_is_negative(dentry))
 		goto out;
-	status = vfs_rmdir(d_inode(dir), dentry);
+	status = vfs_rmdir(&init_user_ns, d_inode(dir), dentry);
 out:
 	dput(dentry);
 out_unlock:
@@ -443,7 +443,7 @@ purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
 	if (nfs4_has_reclaimed_state(name, nn))
 		goto out_free;
 
-	status = vfs_rmdir(d_inode(parent), child);
+	status = vfs_rmdir(&init_user_ns, d_inode(parent), child);
 	if (status)
 		printk("failed to remove client recovery directory %pd\n",
 				child);
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 4744a276058d..10b44421eace 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -40,7 +40,8 @@ static int nfsd_acceptable(void *expv, struct dentry *dentry)
 		/* make sure parents give x permission to user */
 		int err;
 		parent = dget_parent(tdentry);
-		err = inode_permission(d_inode(parent), MAY_EXEC);
+		err = inode_permission(&init_user_ns,
+				       d_inode(parent), MAY_EXEC);
 		if (err < 0) {
 			dput(parent);
 			break;
diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index b2f8035f166b..a8d5449dd0e9 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -90,7 +90,7 @@ nfsd_proc_setattr(struct svc_rqst *rqstp)
 		if (delta < 0)
 			delta = -delta;
 		if (delta < MAX_TOUCH_TIME_ERROR &&
-		    setattr_prepare(fhp->fh_dentry, iap) != 0) {
+		    setattr_prepare(&init_user_ns, fhp->fh_dentry, iap) != 0) {
 			/*
 			 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
 			 * This will cause notify_change to set these times
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index d316e11923c5..fd6be35a1642 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -448,7 +448,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
 			.ia_size	= iap->ia_size,
 		};
 
-		host_err = notify_change(dentry, &size_attr, NULL);
+		host_err = notify_change(&init_user_ns, dentry, &size_attr, NULL);
 		if (host_err)
 			goto out_unlock;
 		iap->ia_valid &= ~ATTR_SIZE;
@@ -463,7 +463,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
 	}
 
 	iap->ia_valid |= ATTR_CTIME;
-	host_err = notify_change(dentry, iap, NULL);
+	host_err = notify_change(&init_user_ns, dentry, iap, NULL);
 
 out_unlock:
 	fh_unlock(fhp);
@@ -499,7 +499,8 @@ int nfsd4_is_junction(struct dentry *dentry)
 		return 0;
 	if (!(inode->i_mode & S_ISVTX))
 		return 0;
-	if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0)
+	if (vfs_getxattr(&init_user_ns, dentry, NFSD_JUNCTION_XATTR_NAME,
+			 NULL, 0) <= 0)
 		return 0;
 	return 1;
 }
@@ -1254,12 +1255,12 @@ nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	host_err = 0;
 	switch (type) {
 	case S_IFREG:
-		host_err = vfs_create(dirp, dchild, iap->ia_mode, true);
+		host_err = vfs_create(&init_user_ns, dirp, dchild, iap->ia_mode, true);
 		if (!host_err)
 			nfsd_check_ignore_resizing(iap);
 		break;
 	case S_IFDIR:
-		host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
+		host_err = vfs_mkdir(&init_user_ns, dirp, dchild, iap->ia_mode);
 		if (!host_err && unlikely(d_unhashed(dchild))) {
 			struct dentry *d;
 			d = lookup_one_len(dchild->d_name.name,
@@ -1287,7 +1288,8 @@ nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	case S_IFBLK:
 	case S_IFIFO:
 	case S_IFSOCK:
-		host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
+		host_err = vfs_mknod(&init_user_ns, dirp, dchild,
+				     iap->ia_mode, rdev);
 		break;
 	default:
 		printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
@@ -1485,7 +1487,7 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	if (!IS_POSIXACL(dirp))
 		iap->ia_mode &= ~current_umask();
 
-	host_err = vfs_create(dirp, dchild, iap->ia_mode, true);
+	host_err = vfs_create(&init_user_ns, dirp, dchild, iap->ia_mode, true);
 	if (host_err < 0) {
 		fh_drop_write(fhp);
 		goto out_nfserr;
@@ -1609,7 +1611,7 @@ nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	if (IS_ERR(dnew))
 		goto out_nfserr;
 
-	host_err = vfs_symlink(d_inode(dentry), dnew, path);
+	host_err = vfs_symlink(&init_user_ns, d_inode(dentry), dnew, path);
 	err = nfserrno(host_err);
 	if (!err)
 		err = nfserrno(commit_metadata(fhp));
@@ -1677,7 +1679,7 @@ nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
 	err = nfserr_noent;
 	if (d_really_is_negative(dold))
 		goto out_dput;
-	host_err = vfs_link(dold, dirp, dnew, NULL);
+	host_err = vfs_link(dold, &init_user_ns, dirp, dnew, NULL);
 	if (!host_err) {
 		err = nfserrno(commit_metadata(ffhp));
 		if (!err)
@@ -1797,7 +1799,15 @@ retry:
 		close_cached = true;
 		goto out_dput_old;
 	} else {
-		host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0);
+		struct renamedata rd = {
+			.old_mnt_userns	= &init_user_ns,
+			.old_dir	= fdir,
+			.old_dentry	= odentry,
+			.new_mnt_userns	= &init_user_ns,
+			.new_dir	= tdir,
+			.new_dentry	= ndentry,
+		};
+		host_err = vfs_rename(&rd);
 		if (!host_err) {
 			host_err = commit_metadata(tfhp);
 			if (!host_err)
@@ -1884,9 +1894,9 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
 	if (type != S_IFDIR) {
 		if (rdentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK)
 			nfsd_close_cached_files(rdentry);
-		host_err = vfs_unlink(dirp, rdentry, NULL);
+		host_err = vfs_unlink(&init_user_ns, dirp, rdentry, NULL);
 	} else {
-		host_err = vfs_rmdir(dirp, rdentry);
+		host_err = vfs_rmdir(&init_user_ns, dirp, rdentry);
 	}
 
 	if (!host_err)
@@ -2149,7 +2159,7 @@ nfsd_getxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name,
 
 	inode_lock_shared(inode);
 
-	len = vfs_getxattr(dentry, name, NULL, 0);
+	len = vfs_getxattr(&init_user_ns, dentry, name, NULL, 0);
 
 	/*
 	 * Zero-length attribute, just return.
@@ -2176,7 +2186,7 @@ nfsd_getxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name,
 		goto out;
 	}
 
-	len = vfs_getxattr(dentry, name, buf, len);
+	len = vfs_getxattr(&init_user_ns, dentry, name, buf, len);
 	if (len <= 0) {
 		kvfree(buf);
 		buf = NULL;
@@ -2283,7 +2293,8 @@ nfsd_removexattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name)
 
 	fh_lock(fhp);
 
-	ret = __vfs_removexattr_locked(fhp->fh_dentry, name, NULL);
+	ret = __vfs_removexattr_locked(&init_user_ns, fhp->fh_dentry,
+				       name, NULL);
 
 	fh_unlock(fhp);
 	fh_drop_write(fhp);
@@ -2307,8 +2318,8 @@ nfsd_setxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name,
 		return nfserrno(ret);
 	fh_lock(fhp);
 
-	ret = __vfs_setxattr_locked(fhp->fh_dentry, name, buf, len, flags,
-				    NULL);
+	ret = __vfs_setxattr_locked(&init_user_ns, fhp->fh_dentry, name, buf,
+				    len, flags, NULL);
 
 	fh_unlock(fhp);
 	fh_drop_write(fhp);
@@ -2391,13 +2402,14 @@ nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
 		return 0;
 
 	/* This assumes  NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */
-	err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC));
+	err = inode_permission(&init_user_ns, inode,
+			       acc & (MAY_READ | MAY_WRITE | MAY_EXEC));
 
 	/* Allow read access to binaries even when mode 111 */
 	if (err == -EACCES && S_ISREG(inode->i_mode) &&
 	     (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) ||
 	      acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC)))
-		err = inode_permission(inode, MAY_EXEC);
+		err = inode_permission(&init_user_ns, inode, MAY_EXEC);
 
 	return err? nfserrno(err) : 0;
 }
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 745d371d6fea..2e8eb263cf0f 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -348,7 +348,7 @@ struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
 	/* reference count of i_bh inherits from nilfs_mdt_read_block() */
 
 	atomic64_inc(&root->inodes_count);
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 	inode->i_ino = ino;
 	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 
@@ -805,14 +805,15 @@ void nilfs_evict_inode(struct inode *inode)
 	 */
 }
 
-int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
+int nilfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		  struct iattr *iattr)
 {
 	struct nilfs_transaction_info ti;
 	struct inode *inode = d_inode(dentry);
 	struct super_block *sb = inode->i_sb;
 	int err;
 
-	err = setattr_prepare(dentry, iattr);
+	err = setattr_prepare(&init_user_ns, dentry, iattr);
 	if (err)
 		return err;
 
@@ -827,7 +828,7 @@ int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
 		nilfs_truncate(inode);
 	}
 
-	setattr_copy(inode, iattr);
+	setattr_copy(&init_user_ns, inode, iattr);
 	mark_inode_dirty(inode);
 
 	if (iattr->ia_valid & ATTR_MODE) {
@@ -843,7 +844,8 @@ out_err:
 	return err;
 }
 
-int nilfs_permission(struct inode *inode, int mask)
+int nilfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		     int mask)
 {
 	struct nilfs_root *root = NILFS_I(inode)->i_root;
 
@@ -851,7 +853,7 @@ int nilfs_permission(struct inode *inode, int mask)
 	    root->cno != NILFS_CPTREE_CURRENT_CNO)
 		return -EROFS; /* snapshot is not writable */
 
-	return generic_permission(inode, mask);
+	return generic_permission(&init_user_ns, inode, mask);
 }
 
 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 07d26f61f22a..b053b40315bf 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -132,7 +132,7 @@ static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
 	unsigned int flags, oldflags;
 	int ret;
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EACCES;
 
 	if (get_user(flags, (int __user *)argp))
diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index a6ec7961d4f5..ecace5f96a95 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -72,8 +72,8 @@ nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
  * If the create succeeds, we fill in the inode information
  * with d_instantiate().
  */
-static int nilfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-			bool excl)
+static int nilfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct inode *inode;
 	struct nilfs_transaction_info ti;
@@ -100,7 +100,8 @@ static int nilfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 }
 
 static int
-nilfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
+nilfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+	    struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct inode *inode;
 	struct nilfs_transaction_info ti;
@@ -124,8 +125,8 @@ nilfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
 	return err;
 }
 
-static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
-			 const char *symname)
+static int nilfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			 struct dentry *dentry, const char *symname)
 {
 	struct nilfs_transaction_info ti;
 	struct super_block *sb = dir->i_sb;
@@ -201,7 +202,8 @@ static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
 	return err;
 }
 
-static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int nilfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode)
 {
 	struct inode *inode;
 	struct nilfs_transaction_info ti;
@@ -338,8 +340,9 @@ static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
 	return err;
 }
 
-static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
-			struct inode *new_dir,	struct dentry *new_dentry,
+static int nilfs_rename(struct user_namespace *mnt_userns,
+			struct inode *old_dir, struct dentry *old_dentry,
+			struct inode *new_dir, struct dentry *new_dentry,
 			unsigned int flags)
 {
 	struct inode *old_inode = d_inode(old_dentry);
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index f8450ee3fd06..c4a45a081ade 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -267,9 +267,11 @@ extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
 extern void nilfs_update_inode(struct inode *, struct buffer_head *, int);
 extern void nilfs_truncate(struct inode *);
 extern void nilfs_evict_inode(struct inode *);
-extern int nilfs_setattr(struct dentry *, struct iattr *);
+extern int nilfs_setattr(struct user_namespace *, struct dentry *,
+			 struct iattr *);
 extern void nilfs_write_failed(struct address_space *mapping, loff_t to);
-int nilfs_permission(struct inode *inode, int mask);
+int nilfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		     int mask);
 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
 extern int nilfs_inode_dirty(struct inode *);
 int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty);
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index b78dd1f88f7c..9e0c1afac8bd 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -702,7 +702,7 @@ static int fanotify_find_path(int dfd, const char __user *filename,
 	}
 
 	/* you can only watch an inode if you have read permissions on it */
-	ret = inode_permission(path->dentry->d_inode, MAY_READ);
+	ret = path_permission(path, MAY_READ);
 	if (ret) {
 		path_put(path);
 		goto out;
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 266d17e8ecb9..c71be4fb7dc5 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -352,7 +352,7 @@ static int inotify_find_inode(const char __user *dirname, struct path *path,
 	if (error)
 		return error;
 	/* you can only watch an inode if you have read permissions on it */
-	error = inode_permission(path->dentry->d_inode, MAY_READ);
+	error = path_permission(path, MAY_READ);
 	if (error) {
 		path_put(path);
 		return error;
diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index f7e4cbc26eaf..4435dbbc0b63 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -2848,6 +2848,7 @@ void ntfs_truncate_vfs(struct inode *vi) {
 
 /**
  * ntfs_setattr - called from notify_change() when an attribute is being changed
+ * @mnt_userns:	user namespace of the mount the inode was found from
  * @dentry:	dentry whose attributes to change
  * @attr:	structure describing the attributes and the changes
  *
@@ -2860,13 +2861,14 @@ void ntfs_truncate_vfs(struct inode *vi) {
  *
  * Called with ->i_mutex held.
  */
-int ntfs_setattr(struct dentry *dentry, struct iattr *attr)
+int ntfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		 struct iattr *attr)
 {
 	struct inode *vi = d_inode(dentry);
 	int err;
 	unsigned int ia_valid = attr->ia_valid;
 
-	err = setattr_prepare(dentry, attr);
+	err = setattr_prepare(&init_user_ns, dentry, attr);
 	if (err)
 		goto out;
 	/* We do not support NTFS ACLs yet. */
diff --git a/fs/ntfs/inode.h b/fs/ntfs/inode.h
index 363e4e820673..6f78ee00f57f 100644
--- a/fs/ntfs/inode.h
+++ b/fs/ntfs/inode.h
@@ -289,7 +289,8 @@ extern int ntfs_show_options(struct seq_file *sf, struct dentry *root);
 extern int ntfs_truncate(struct inode *vi);
 extern void ntfs_truncate_vfs(struct inode *vi);
 
-extern int ntfs_setattr(struct dentry *dentry, struct iattr *attr);
+extern int ntfs_setattr(struct user_namespace *mnt_userns,
+			struct dentry *dentry, struct iattr *attr);
 
 extern int __ntfs_write_inode(struct inode *vi, int sync);
 
diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
index 7b07f5df3a29..5259badabb56 100644
--- a/fs/ocfs2/acl.c
+++ b/fs/ocfs2/acl.c
@@ -262,7 +262,8 @@ static int ocfs2_set_acl(handle_t *handle,
 	return ret;
 }
 
-int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+int ocfs2_iop_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		      struct posix_acl *acl, int type)
 {
 	struct buffer_head *bh = NULL;
 	int status, had_lock;
@@ -274,7 +275,8 @@ int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 	if (type == ACL_TYPE_ACCESS && acl) {
 		umode_t mode;
 
-		status = posix_acl_update_mode(inode, &mode, &acl);
+		status = posix_acl_update_mode(&init_user_ns, inode, &mode,
+					       &acl);
 		if (status)
 			goto unlock;
 
diff --git a/fs/ocfs2/acl.h b/fs/ocfs2/acl.h
index 127b13432146..4e86450917b2 100644
--- a/fs/ocfs2/acl.h
+++ b/fs/ocfs2/acl.h
@@ -19,7 +19,8 @@ struct ocfs2_acl_entry {
 };
 
 struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type);
-int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+int ocfs2_iop_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		      struct posix_acl *acl, int type);
 extern int ocfs2_acl_chmod(struct inode *, struct buffer_head *);
 extern int ocfs2_init_acl(handle_t *, struct inode *, struct inode *,
 			  struct buffer_head *, struct buffer_head *,
diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
index 583820ec63e2..b2870f1a31df 100644
--- a/fs/ocfs2/dlmfs/dlmfs.c
+++ b/fs/ocfs2/dlmfs/dlmfs.c
@@ -190,17 +190,18 @@ static int dlmfs_file_release(struct inode *inode,
  * We do ->setattr() just to override size changes.  Our size is the size
  * of the LVB and nothing else.
  */
-static int dlmfs_file_setattr(struct dentry *dentry, struct iattr *attr)
+static int dlmfs_file_setattr(struct user_namespace *mnt_userns,
+			      struct dentry *dentry, struct iattr *attr)
 {
 	int error;
 	struct inode *inode = d_inode(dentry);
 
 	attr->ia_valid &= ~ATTR_SIZE;
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		return error;
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
@@ -329,7 +330,7 @@ static struct inode *dlmfs_get_root_inode(struct super_block *sb)
 
 	if (inode) {
 		inode->i_ino = get_next_ino();
-		inode_init_owner(inode, NULL, mode);
+		inode_init_owner(&init_user_ns, inode, NULL, mode);
 		inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
 		inc_nlink(inode);
 
@@ -352,7 +353,7 @@ static struct inode *dlmfs_get_inode(struct inode *parent,
 		return NULL;
 
 	inode->i_ino = get_next_ino();
-	inode_init_owner(inode, parent, mode);
+	inode_init_owner(&init_user_ns, inode, parent, mode);
 	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
 
 	ip = DLMFS_I(inode);
@@ -395,7 +396,8 @@ static struct inode *dlmfs_get_inode(struct inode *parent,
  * File creation. Allocate an inode, and we're done..
  */
 /* SMP-safe */
-static int dlmfs_mkdir(struct inode * dir,
+static int dlmfs_mkdir(struct user_namespace * mnt_userns,
+		       struct inode * dir,
 		       struct dentry * dentry,
 		       umode_t mode)
 {
@@ -443,7 +445,8 @@ bail:
 	return status;
 }
 
-static int dlmfs_create(struct inode *dir,
+static int dlmfs_create(struct user_namespace *mnt_userns,
+			struct inode *dir,
 			struct dentry *dentry,
 			umode_t mode,
 			bool excl)
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index df6d709d2ae3..6611c64ca0be 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1112,7 +1112,8 @@ out:
 	return ret;
 }
 
-int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
+int ocfs2_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		  struct iattr *attr)
 {
 	int status = 0, size_change;
 	int inode_locked = 0;
@@ -1142,7 +1143,7 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
 	if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
 		return 0;
 
-	status = setattr_prepare(dentry, attr);
+	status = setattr_prepare(&init_user_ns, dentry, attr);
 	if (status)
 		return status;
 
@@ -1263,7 +1264,7 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
 		}
 	}
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 
 	status = ocfs2_mark_inode_dirty(handle, inode, bh);
@@ -1298,8 +1299,8 @@ bail:
 	return status;
 }
 
-int ocfs2_getattr(const struct path *path, struct kstat *stat,
-		  u32 request_mask, unsigned int flags)
+int ocfs2_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		  struct kstat *stat, u32 request_mask, unsigned int flags)
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct super_block *sb = path->dentry->d_sb;
@@ -1313,7 +1314,7 @@ int ocfs2_getattr(const struct path *path, struct kstat *stat,
 		goto bail;
 	}
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	/*
 	 * If there is inline data in the inode, the inode will normally not
 	 * have data blocks allocated (it may have an external xattr block).
@@ -1330,7 +1331,8 @@ bail:
 	return err;
 }
 
-int ocfs2_permission(struct inode *inode, int mask)
+int ocfs2_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		     int mask)
 {
 	int ret, had_lock;
 	struct ocfs2_lock_holder oh;
@@ -1355,7 +1357,7 @@ int ocfs2_permission(struct inode *inode, int mask)
 		dump_stack();
 	}
 
-	ret = generic_permission(inode, mask);
+	ret = generic_permission(&init_user_ns, inode, mask);
 
 	ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
 out:
diff --git a/fs/ocfs2/file.h b/fs/ocfs2/file.h
index 4832cbceba5b..8536cec5f122 100644
--- a/fs/ocfs2/file.h
+++ b/fs/ocfs2/file.h
@@ -51,10 +51,13 @@ int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
 			  u64 new_i_size, u64 zero_to);
 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
 		      loff_t zero_to);
-int ocfs2_setattr(struct dentry *dentry, struct iattr *attr);
-int ocfs2_getattr(const struct path *path, struct kstat *stat,
-		  u32 request_mask, unsigned int flags);
-int ocfs2_permission(struct inode *inode, int mask);
+int ocfs2_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		  struct iattr *attr);
+int ocfs2_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		  struct kstat *stat, u32 request_mask, unsigned int flags);
+int ocfs2_permission(struct user_namespace *mnt_userns,
+		     struct inode *inode,
+		     int mask);
 
 int ocfs2_should_update_atime(struct inode *inode,
 			      struct vfsmount *vfsmnt);
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index 89984172fc4a..50c9b30ee9f6 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -96,7 +96,7 @@ static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
 	}
 
 	status = -EACCES;
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		goto bail_unlock;
 
 	if (!S_ISDIR(inode->i_mode))
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 2a237ab00453..3abdd36da2e2 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -198,7 +198,7 @@ static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t mode)
 	 * callers. */
 	if (S_ISDIR(mode))
 		set_nlink(inode, 2);
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 	status = dquot_initialize(inode);
 	if (status)
 		return ERR_PTR(status);
@@ -221,7 +221,8 @@ static void ocfs2_cleanup_add_entry_failure(struct ocfs2_super *osb,
 	iput(inode);
 }
 
-static int ocfs2_mknod(struct inode *dir,
+static int ocfs2_mknod(struct user_namespace *mnt_userns,
+		       struct inode *dir,
 		       struct dentry *dentry,
 		       umode_t mode,
 		       dev_t dev)
@@ -645,7 +646,8 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 	return status;
 }
 
-static int ocfs2_mkdir(struct inode *dir,
+static int ocfs2_mkdir(struct user_namespace *mnt_userns,
+		       struct inode *dir,
 		       struct dentry *dentry,
 		       umode_t mode)
 {
@@ -653,14 +655,15 @@ static int ocfs2_mkdir(struct inode *dir,
 
 	trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name,
 			  OCFS2_I(dir)->ip_blkno, mode);
-	ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
+	ret = ocfs2_mknod(&init_user_ns, dir, dentry, mode | S_IFDIR, 0);
 	if (ret)
 		mlog_errno(ret);
 
 	return ret;
 }
 
-static int ocfs2_create(struct inode *dir,
+static int ocfs2_create(struct user_namespace *mnt_userns,
+			struct inode *dir,
 			struct dentry *dentry,
 			umode_t mode,
 			bool excl)
@@ -669,7 +672,7 @@ static int ocfs2_create(struct inode *dir,
 
 	trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name,
 			   (unsigned long long)OCFS2_I(dir)->ip_blkno, mode);
-	ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
+	ret = ocfs2_mknod(&init_user_ns, dir, dentry, mode | S_IFREG, 0);
 	if (ret)
 		mlog_errno(ret);
 
@@ -1195,7 +1198,8 @@ static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
 		ocfs2_inode_unlock(inode2, 1);
 }
 
-static int ocfs2_rename(struct inode *old_dir,
+static int ocfs2_rename(struct user_namespace *mnt_userns,
+			struct inode *old_dir,
 			struct dentry *old_dentry,
 			struct inode *new_dir,
 			struct dentry *new_dentry,
@@ -1784,7 +1788,8 @@ bail:
 	return status;
 }
 
-static int ocfs2_symlink(struct inode *dir,
+static int ocfs2_symlink(struct user_namespace *mnt_userns,
+			 struct inode *dir,
 			 struct dentry *dentry,
 			 const char *symname)
 {
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 3b397fa9c9e8..c26937824be1 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -4346,7 +4346,7 @@ static inline int ocfs2_may_create(struct inode *dir, struct dentry *child)
 		return -EEXIST;
 	if (IS_DEADDIR(dir))
 		return -ENOENT;
-	return inode_permission(dir, MAY_WRITE | MAY_EXEC);
+	return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
 }
 
 /**
@@ -4400,7 +4400,7 @@ static int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir,
 	 * file.
 	 */
 	if (!preserve) {
-		error = inode_permission(inode, MAY_READ);
+		error = inode_permission(&init_user_ns, inode, MAY_READ);
 		if (error)
 			return error;
 	}
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 9ccd19d8f7b1..36ae47a4aef6 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -7249,6 +7249,7 @@ static int ocfs2_xattr_security_get(const struct xattr_handler *handler,
 }
 
 static int ocfs2_xattr_security_set(const struct xattr_handler *handler,
+				    struct user_namespace *mnt_userns,
 				    struct dentry *unused, struct inode *inode,
 				    const char *name, const void *value,
 				    size_t size, int flags)
@@ -7321,6 +7322,7 @@ static int ocfs2_xattr_trusted_get(const struct xattr_handler *handler,
 }
 
 static int ocfs2_xattr_trusted_set(const struct xattr_handler *handler,
+				   struct user_namespace *mnt_userns,
 				   struct dentry *unused, struct inode *inode,
 				   const char *name, const void *value,
 				   size_t size, int flags)
@@ -7351,6 +7353,7 @@ static int ocfs2_xattr_user_get(const struct xattr_handler *handler,
 }
 
 static int ocfs2_xattr_user_set(const struct xattr_handler *handler,
+				struct user_namespace *mnt_userns,
 				struct dentry *unused, struct inode *inode,
 				const char *name, const void *value,
 				size_t size, int flags)
diff --git a/fs/omfs/dir.c b/fs/omfs/dir.c
index a0f45651f3b7..c219f91f44e9 100644
--- a/fs/omfs/dir.c
+++ b/fs/omfs/dir.c
@@ -279,13 +279,14 @@ out_free_inode:
 	return err;
 }
 
-static int omfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int omfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode)
 {
 	return omfs_add_node(dir, dentry, mode | S_IFDIR);
 }
 
-static int omfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		bool excl)
+static int omfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, bool excl)
 {
 	return omfs_add_node(dir, dentry, mode | S_IFREG);
 }
@@ -369,9 +370,9 @@ static bool omfs_fill_chain(struct inode *dir, struct dir_context *ctx,
 	return true;
 }
 
-static int omfs_rename(struct inode *old_dir, struct dentry *old_dentry,
-		       struct inode *new_dir, struct dentry *new_dentry,
-		       unsigned int flags)
+static int omfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		       struct dentry *old_dentry, struct inode *new_dir,
+		       struct dentry *new_dentry, unsigned int flags)
 {
 	struct inode *new_inode = d_inode(new_dentry);
 	struct inode *old_inode = d_inode(old_dentry);
diff --git a/fs/omfs/file.c b/fs/omfs/file.c
index 2c7b70ee1388..11e733aab25d 100644
--- a/fs/omfs/file.c
+++ b/fs/omfs/file.c
@@ -343,12 +343,13 @@ const struct file_operations omfs_file_operations = {
 	.splice_read = generic_file_splice_read,
 };
 
-static int omfs_setattr(struct dentry *dentry, struct iattr *attr)
+static int omfs_setattr(struct user_namespace *mnt_userns,
+			struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		return error;
 
@@ -361,7 +362,7 @@ static int omfs_setattr(struct dentry *dentry, struct iattr *attr)
 		omfs_truncate(inode);
 	}
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
diff --git a/fs/omfs/inode.c b/fs/omfs/inode.c
index ce93ccca8639..2a0e83236c01 100644
--- a/fs/omfs/inode.c
+++ b/fs/omfs/inode.c
@@ -48,7 +48,7 @@ struct inode *omfs_new_inode(struct inode *dir, umode_t mode)
 		goto fail;
 
 	inode->i_ino = new_block;
-	inode_init_owner(inode, NULL, mode);
+	inode_init_owner(&init_user_ns, inode, NULL, mode);
 	inode->i_mapping->a_ops = &omfs_aops;
 
 	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
diff --git a/fs/open.c b/fs/open.c
index ca5444733acd..e53af13b5835 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -35,8 +35,8 @@
 
 #include "internal.h"
 
-int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
-	struct file *filp)
+int do_truncate(struct user_namespace *mnt_userns, struct dentry *dentry,
+		loff_t length, unsigned int time_attrs, struct file *filp)
 {
 	int ret;
 	struct iattr newattrs;
@@ -61,13 +61,14 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
 
 	inode_lock(dentry->d_inode);
 	/* Note any delegations or leases have already been broken: */
-	ret = notify_change(dentry, &newattrs, NULL);
+	ret = notify_change(mnt_userns, dentry, &newattrs, NULL);
 	inode_unlock(dentry->d_inode);
 	return ret;
 }
 
 long vfs_truncate(const struct path *path, loff_t length)
 {
+	struct user_namespace *mnt_userns;
 	struct inode *inode;
 	long error;
 
@@ -83,7 +84,8 @@ long vfs_truncate(const struct path *path, loff_t length)
 	if (error)
 		goto out;
 
-	error = inode_permission(inode, MAY_WRITE);
+	mnt_userns = mnt_user_ns(path->mnt);
+	error = inode_permission(mnt_userns, inode, MAY_WRITE);
 	if (error)
 		goto mnt_drop_write_and_out;
 
@@ -107,7 +109,7 @@ long vfs_truncate(const struct path *path, loff_t length)
 	if (!error)
 		error = security_path_truncate(path);
 	if (!error)
-		error = do_truncate(path->dentry, length, 0, NULL);
+		error = do_truncate(mnt_userns, path->dentry, length, 0, NULL);
 
 put_write_and_out:
 	put_write_access(inode);
@@ -186,13 +188,13 @@ long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
 	/* Check IS_APPEND on real upper inode */
 	if (IS_APPEND(file_inode(f.file)))
 		goto out_putf;
-
 	sb_start_write(inode->i_sb);
 	error = locks_verify_truncate(inode, f.file, length);
 	if (!error)
 		error = security_path_truncate(&f.file->f_path);
 	if (!error)
-		error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, f.file);
+		error = do_truncate(file_mnt_user_ns(f.file), dentry, length,
+				    ATTR_MTIME | ATTR_CTIME, f.file);
 	sb_end_write(inode->i_sb);
 out_putf:
 	fdput(f);
@@ -436,7 +438,7 @@ retry:
 			goto out_path_release;
 	}
 
-	res = inode_permission(inode, mode | MAY_ACCESS);
+	res = inode_permission(mnt_user_ns(path.mnt), inode, mode | MAY_ACCESS);
 	/* SuS v2 requires we report a read only fs too */
 	if (res || !(mode & S_IWOTH) || special_file(inode->i_mode))
 		goto out_path_release;
@@ -492,7 +494,7 @@ retry:
 	if (error)
 		goto out;
 
-	error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
+	error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
 	if (error)
 		goto dput_and_out;
 
@@ -521,7 +523,7 @@ SYSCALL_DEFINE1(fchdir, unsigned int, fd)
 	if (!d_can_lookup(f.file->f_path.dentry))
 		goto out_putf;
 
-	error = inode_permission(file_inode(f.file), MAY_EXEC | MAY_CHDIR);
+	error = file_permission(f.file, MAY_EXEC | MAY_CHDIR);
 	if (!error)
 		set_fs_pwd(current->fs, &f.file->f_path);
 out_putf:
@@ -540,7 +542,7 @@ retry:
 	if (error)
 		goto out;
 
-	error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
+	error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
 	if (error)
 		goto dput_and_out;
 
@@ -580,7 +582,8 @@ retry_deleg:
 		goto out_unlock;
 	newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
 	newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
-	error = notify_change(path->dentry, &newattrs, &delegated_inode);
+	error = notify_change(mnt_user_ns(path->mnt), path->dentry,
+			      &newattrs, &delegated_inode);
 out_unlock:
 	inode_unlock(inode);
 	if (delegated_inode) {
@@ -641,6 +644,7 @@ SYSCALL_DEFINE2(chmod, const char __user *, filename, umode_t, mode)
 
 int chown_common(const struct path *path, uid_t user, gid_t group)
 {
+	struct user_namespace *mnt_userns;
 	struct inode *inode = path->dentry->d_inode;
 	struct inode *delegated_inode = NULL;
 	int error;
@@ -651,6 +655,10 @@ int chown_common(const struct path *path, uid_t user, gid_t group)
 	uid = make_kuid(current_user_ns(), user);
 	gid = make_kgid(current_user_ns(), group);
 
+	mnt_userns = mnt_user_ns(path->mnt);
+	uid = kuid_from_mnt(mnt_userns, uid);
+	gid = kgid_from_mnt(mnt_userns, gid);
+
 retry_deleg:
 	newattrs.ia_valid =  ATTR_CTIME;
 	if (user != (uid_t) -1) {
@@ -671,7 +679,8 @@ retry_deleg:
 	inode_lock(inode);
 	error = security_path_chown(path, uid, gid);
 	if (!error)
-		error = notify_change(path->dentry, &newattrs, &delegated_inode);
+		error = notify_change(mnt_userns, path->dentry, &newattrs,
+				      &delegated_inode);
 	inode_unlock(inode);
 	if (delegated_inode) {
 		error = break_deleg_wait(&delegated_inode);
diff --git a/fs/orangefs/acl.c b/fs/orangefs/acl.c
index a25e6c890975..18852b9ed82b 100644
--- a/fs/orangefs/acl.c
+++ b/fs/orangefs/acl.c
@@ -116,7 +116,8 @@ out:
 	return error;
 }
 
-int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+int orangefs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		     struct posix_acl *acl, int type)
 {
 	int error;
 	struct iattr iattr;
@@ -132,7 +133,8 @@ int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 		 * and "mode" to the new desired value. It is up to
 		 * us to propagate the new mode back to the server...
 		 */
-		error = posix_acl_update_mode(inode, &iattr.ia_mode, &acl);
+		error = posix_acl_update_mode(&init_user_ns, inode,
+					      &iattr.ia_mode, &acl);
 		if (error) {
 			gossip_err("%s: posix_acl_update_mode err: %d\n",
 				   __func__,
diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c
index 48f0547d4850..5079cfafa8d7 100644
--- a/fs/orangefs/inode.c
+++ b/fs/orangefs/inode.c
@@ -855,13 +855,13 @@ again:
 		ORANGEFS_I(inode)->attr_uid = current_fsuid();
 		ORANGEFS_I(inode)->attr_gid = current_fsgid();
 	}
-	setattr_copy(inode, iattr);
+	setattr_copy(&init_user_ns, inode, iattr);
 	spin_unlock(&inode->i_lock);
 	mark_inode_dirty(inode);
 
 	if (iattr->ia_valid & ATTR_MODE)
 		/* change mod on a file that has ACLs */
-		ret = posix_acl_chmod(inode, inode->i_mode);
+		ret = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
 
 	ret = 0;
 out:
@@ -871,12 +871,13 @@ out:
 /*
  * Change attributes of an object referenced by dentry.
  */
-int orangefs_setattr(struct dentry *dentry, struct iattr *iattr)
+int orangefs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		     struct iattr *iattr)
 {
 	int ret;
 	gossip_debug(GOSSIP_INODE_DEBUG, "__orangefs_setattr: called on %pd\n",
 	    dentry);
-	ret = setattr_prepare(dentry, iattr);
+	ret = setattr_prepare(&init_user_ns, dentry, iattr);
 	if (ret)
 	        goto out;
 	ret = __orangefs_setattr(d_inode(dentry), iattr);
@@ -890,8 +891,8 @@ out:
 /*
  * Obtain attributes of an object given a dentry
  */
-int orangefs_getattr(const struct path *path, struct kstat *stat,
-		     u32 request_mask, unsigned int flags)
+int orangefs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		     struct kstat *stat, u32 request_mask, unsigned int flags)
 {
 	int ret;
 	struct inode *inode = path->dentry->d_inode;
@@ -903,7 +904,7 @@ int orangefs_getattr(const struct path *path, struct kstat *stat,
 	ret = orangefs_inode_getattr(inode,
 	    request_mask & STATX_SIZE ? ORANGEFS_GETATTR_SIZE : 0);
 	if (ret == 0) {
-		generic_fillattr(inode, stat);
+		generic_fillattr(&init_user_ns, inode, stat);
 
 		/* override block size reported to stat */
 		if (!(request_mask & STATX_SIZE))
@@ -919,7 +920,8 @@ int orangefs_getattr(const struct path *path, struct kstat *stat,
 	return ret;
 }
 
-int orangefs_permission(struct inode *inode, int mask)
+int orangefs_permission(struct user_namespace *mnt_userns,
+			struct inode *inode, int mask)
 {
 	int ret;
 
@@ -933,7 +935,7 @@ int orangefs_permission(struct inode *inode, int mask)
 	if (ret < 0)
 		return ret;
 
-	return generic_permission(inode, mask);
+	return generic_permission(&init_user_ns, inode, mask);
 }
 
 int orangefs_update_time(struct inode *inode, struct timespec64 *time, int flags)
diff --git a/fs/orangefs/namei.c b/fs/orangefs/namei.c
index 3e7cf3d0a494..600e8eee541f 100644
--- a/fs/orangefs/namei.c
+++ b/fs/orangefs/namei.c
@@ -15,7 +15,8 @@
 /*
  * Get a newly allocated inode to go with a negative dentry.
  */
-static int orangefs_create(struct inode *dir,
+static int orangefs_create(struct user_namespace *mnt_userns,
+			struct inode *dir,
 			struct dentry *dentry,
 			umode_t mode,
 			bool exclusive)
@@ -215,7 +216,8 @@ static int orangefs_unlink(struct inode *dir, struct dentry *dentry)
 	return ret;
 }
 
-static int orangefs_symlink(struct inode *dir,
+static int orangefs_symlink(struct user_namespace *mnt_userns,
+		         struct inode *dir,
 			 struct dentry *dentry,
 			 const char *symname)
 {
@@ -303,7 +305,8 @@ out:
 	return ret;
 }
 
-static int orangefs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int orangefs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+			  struct dentry *dentry, umode_t mode)
 {
 	struct orangefs_inode_s *parent = ORANGEFS_I(dir);
 	struct orangefs_kernel_op_s *new_op;
@@ -372,7 +375,8 @@ out:
 	return ret;
 }
 
-static int orangefs_rename(struct inode *old_dir,
+static int orangefs_rename(struct user_namespace *mnt_userns,
+			struct inode *old_dir,
 			struct dentry *old_dentry,
 			struct inode *new_dir,
 			struct dentry *new_dentry,
diff --git a/fs/orangefs/orangefs-kernel.h b/fs/orangefs/orangefs-kernel.h
index e12aeb9623d6..0e6b97682e41 100644
--- a/fs/orangefs/orangefs-kernel.h
+++ b/fs/orangefs/orangefs-kernel.h
@@ -107,7 +107,9 @@ extern int orangefs_init_acl(struct inode *inode, struct inode *dir);
 extern const struct xattr_handler *orangefs_xattr_handlers[];
 
 extern struct posix_acl *orangefs_get_acl(struct inode *inode, int type);
-extern int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+extern int orangefs_set_acl(struct user_namespace *mnt_userns,
+			    struct inode *inode, struct posix_acl *acl,
+			    int type);
 
 /*
  * orangefs data structures
@@ -359,12 +361,13 @@ struct inode *orangefs_new_inode(struct super_block *sb,
 			      struct orangefs_object_kref *ref);
 
 int __orangefs_setattr(struct inode *, struct iattr *);
-int orangefs_setattr(struct dentry *, struct iattr *);
+int orangefs_setattr(struct user_namespace *, struct dentry *, struct iattr *);
 
-int orangefs_getattr(const struct path *path, struct kstat *stat,
-		     u32 request_mask, unsigned int flags);
+int orangefs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		     struct kstat *stat, u32 request_mask, unsigned int flags);
 
-int orangefs_permission(struct inode *inode, int mask);
+int orangefs_permission(struct user_namespace *mnt_userns,
+			struct inode *inode, int mask);
 
 int orangefs_update_time(struct inode *, struct timespec64 *, int);
 
diff --git a/fs/orangefs/xattr.c b/fs/orangefs/xattr.c
index bdc285aea360..9a5b757fbd2f 100644
--- a/fs/orangefs/xattr.c
+++ b/fs/orangefs/xattr.c
@@ -526,6 +526,7 @@ out_unlock:
 }
 
 static int orangefs_xattr_set_default(const struct xattr_handler *handler,
+				      struct user_namespace *mnt_userns,
 				      struct dentry *unused,
 				      struct inode *inode,
 				      const char *name,
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 0fed532efa68..0b2891c6c71e 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -93,9 +93,9 @@ int ovl_copy_xattr(struct super_block *sb, struct dentry *old,
 			continue; /* Discard */
 		}
 retry:
-		size = vfs_getxattr(old, name, value, value_size);
+		size = vfs_getxattr(&init_user_ns, old, name, value, value_size);
 		if (size == -ERANGE)
-			size = vfs_getxattr(old, name, NULL, 0);
+			size = vfs_getxattr(&init_user_ns, old, name, NULL, 0);
 
 		if (size < 0) {
 			error = size;
@@ -115,7 +115,7 @@ retry:
 			goto retry;
 		}
 
-		error = vfs_setxattr(new, name, value, size, 0);
+		error = vfs_setxattr(&init_user_ns, new, name, value, size, 0);
 		if (error) {
 			if (error != -EOPNOTSUPP || ovl_must_copy_xattr(name))
 				break;
@@ -236,7 +236,7 @@ static int ovl_set_size(struct dentry *upperdentry, struct kstat *stat)
 		.ia_size = stat->size,
 	};
 
-	return notify_change(upperdentry, &attr, NULL);
+	return notify_change(&init_user_ns, upperdentry, &attr, NULL);
 }
 
 static int ovl_set_timestamps(struct dentry *upperdentry, struct kstat *stat)
@@ -248,7 +248,7 @@ static int ovl_set_timestamps(struct dentry *upperdentry, struct kstat *stat)
 		.ia_mtime = stat->mtime,
 	};
 
-	return notify_change(upperdentry, &attr, NULL);
+	return notify_change(&init_user_ns, upperdentry, &attr, NULL);
 }
 
 int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
@@ -260,7 +260,7 @@ int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
 			.ia_valid = ATTR_MODE,
 			.ia_mode = stat->mode,
 		};
-		err = notify_change(upperdentry, &attr, NULL);
+		err = notify_change(&init_user_ns, upperdentry, &attr, NULL);
 	}
 	if (!err) {
 		struct iattr attr = {
@@ -268,7 +268,7 @@ int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
 			.ia_uid = stat->uid,
 			.ia_gid = stat->gid,
 		};
-		err = notify_change(upperdentry, &attr, NULL);
+		err = notify_change(&init_user_ns, upperdentry, &attr, NULL);
 	}
 	if (!err)
 		ovl_set_timestamps(upperdentry, stat);
@@ -796,7 +796,7 @@ static ssize_t ovl_getxattr(struct dentry *dentry, char *name, char **value)
 	ssize_t res;
 	char *buf;
 
-	res = vfs_getxattr(dentry, name, NULL, 0);
+	res = vfs_getxattr(&init_user_ns, dentry, name, NULL, 0);
 	if (res == -ENODATA || res == -EOPNOTSUPP)
 		res = 0;
 
@@ -805,7 +805,7 @@ static ssize_t ovl_getxattr(struct dentry *dentry, char *name, char **value)
 		if (!buf)
 			return -ENOMEM;
 
-		res = vfs_getxattr(dentry, name, buf, res);
+		res = vfs_getxattr(&init_user_ns, dentry, name, buf, res);
 		if (res < 0)
 			kfree(buf);
 		else
@@ -847,8 +847,8 @@ static int ovl_copy_up_meta_inode_data(struct ovl_copy_up_ctx *c)
 	 * don't want that to happen for normal copy-up operation.
 	 */
 	if (capability) {
-		err = vfs_setxattr(upperpath.dentry, XATTR_NAME_CAPS,
-				   capability, cap_size, 0);
+		err = vfs_setxattr(&init_user_ns, upperpath.dentry,
+				   XATTR_NAME_CAPS, capability, cap_size, 0);
 		if (err)
 			goto out_free;
 	}
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index d1efa3a5a503..836f14b9d3a6 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -449,7 +449,7 @@ static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name,
 	if (err < 0)
 		goto out_free;
 
-	err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE);
+	err = vfs_setxattr(&init_user_ns, upperdentry, name, buffer, size, XATTR_CREATE);
 out_free:
 	kfree(buffer);
 	return err;
@@ -508,7 +508,7 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
 			.ia_mode = cattr->mode,
 		};
 		inode_lock(newdentry->d_inode);
-		err = notify_change(newdentry, &attr, NULL);
+		err = notify_change(&init_user_ns, newdentry, &attr, NULL);
 		inode_unlock(newdentry->d_inode);
 		if (err)
 			goto out_cleanup;
@@ -636,7 +636,7 @@ static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
 	inode->i_state |= I_CREATING;
 	spin_unlock(&inode->i_lock);
 
-	inode_init_owner(inode, dentry->d_parent->d_inode, mode);
+	inode_init_owner(&init_user_ns, inode, dentry->d_parent->d_inode, mode);
 	attr.mode = inode->i_mode;
 
 	err = ovl_create_or_link(dentry, inode, &attr, false);
@@ -650,19 +650,20 @@ out:
 	return err;
 }
 
-static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		      bool excl)
+static int ovl_create(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, bool excl)
 {
 	return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
 }
 
-static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int ovl_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, umode_t mode)
 {
 	return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL);
 }
 
-static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
-		     dev_t rdev)
+static int ovl_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	/* Don't allow creation of "whiteout" on overlay */
 	if (S_ISCHR(mode) && rdev == WHITEOUT_DEV)
@@ -671,8 +672,8 @@ static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 	return ovl_create_object(dentry, mode, rdev, NULL);
 }
 
-static int ovl_symlink(struct inode *dir, struct dentry *dentry,
-		       const char *link)
+static int ovl_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, const char *link)
 {
 	return ovl_create_object(dentry, S_IFLNK, 0, link);
 }
@@ -821,9 +822,9 @@ static int ovl_remove_upper(struct dentry *dentry, bool is_dir,
 		goto out_dput_upper;
 
 	if (is_dir)
-		err = vfs_rmdir(dir, upper);
+		err = vfs_rmdir(&init_user_ns, dir, upper);
 	else
-		err = vfs_unlink(dir, upper, NULL);
+		err = vfs_unlink(&init_user_ns, dir, upper, NULL);
 	ovl_dir_modified(dentry->d_parent, ovl_type_origin(dentry));
 
 	/*
@@ -1069,9 +1070,9 @@ static int ovl_set_redirect(struct dentry *dentry, bool samedir)
 	return err;
 }
 
-static int ovl_rename(struct inode *olddir, struct dentry *old,
-		      struct inode *newdir, struct dentry *new,
-		      unsigned int flags)
+static int ovl_rename(struct user_namespace *mnt_userns, struct inode *olddir,
+		      struct dentry *old, struct inode *newdir,
+		      struct dentry *new, unsigned int flags)
 {
 	int err;
 	struct dentry *old_upperdir;
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index 077d3ad343f6..dbfb35fb0ff7 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -50,11 +50,11 @@ static struct file *ovl_open_realfile(const struct file *file,
 		acc_mode |= MAY_APPEND;
 
 	old_cred = ovl_override_creds(inode->i_sb);
-	err = inode_permission(realinode, MAY_OPEN | acc_mode);
+	err = inode_permission(&init_user_ns, realinode, MAY_OPEN | acc_mode);
 	if (err) {
 		realfile = ERR_PTR(err);
 	} else {
-		if (!inode_owner_or_capable(realinode))
+		if (!inode_owner_or_capable(&init_user_ns, realinode))
 			flags &= ~O_NOATIME;
 
 		realfile = open_with_fake_path(&file->f_path, flags, realinode,
@@ -521,7 +521,7 @@ static long ovl_ioctl_set_flags(struct file *file, unsigned int cmd,
 	long ret;
 	struct inode *inode = file_inode(file);
 
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		return -EACCES;
 
 	ret = mnt_want_write_file(file);
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index cf41bcb664bc..003cf83bf78a 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -14,14 +14,15 @@
 #include "overlayfs.h"
 
 
-int ovl_setattr(struct dentry *dentry, struct iattr *attr)
+int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		struct iattr *attr)
 {
 	int err;
 	bool full_copy_up = false;
 	struct dentry *upperdentry;
 	const struct cred *old_cred;
 
-	err = setattr_prepare(dentry, attr);
+	err = setattr_prepare(&init_user_ns, dentry, attr);
 	if (err)
 		return err;
 
@@ -79,7 +80,7 @@ int ovl_setattr(struct dentry *dentry, struct iattr *attr)
 
 		inode_lock(upperdentry->d_inode);
 		old_cred = ovl_override_creds(dentry->d_sb);
-		err = notify_change(upperdentry, attr, NULL);
+		err = notify_change(&init_user_ns, upperdentry, attr, NULL);
 		revert_creds(old_cred);
 		if (!err)
 			ovl_copyattr(upperdentry->d_inode, dentry->d_inode);
@@ -154,8 +155,8 @@ static int ovl_map_dev_ino(struct dentry *dentry, struct kstat *stat, int fsid)
 	return 0;
 }
 
-int ovl_getattr(const struct path *path, struct kstat *stat,
-		u32 request_mask, unsigned int flags)
+int ovl_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		struct kstat *stat, u32 request_mask, unsigned int flags)
 {
 	struct dentry *dentry = path->dentry;
 	enum ovl_path_type type;
@@ -277,7 +278,8 @@ out:
 	return err;
 }
 
-int ovl_permission(struct inode *inode, int mask)
+int ovl_permission(struct user_namespace *mnt_userns,
+		   struct inode *inode, int mask)
 {
 	struct inode *upperinode = ovl_inode_upper(inode);
 	struct inode *realinode = upperinode ?: ovl_inode_lower(inode);
@@ -294,7 +296,7 @@ int ovl_permission(struct inode *inode, int mask)
 	 * Check overlay inode with the creds of task and underlying inode
 	 * with creds of mounter
 	 */
-	err = generic_permission(inode, mask);
+	err = generic_permission(&init_user_ns, inode, mask);
 	if (err)
 		return err;
 
@@ -305,7 +307,7 @@ int ovl_permission(struct inode *inode, int mask)
 		/* Make sure mounter can read file for copy up later */
 		mask |= MAY_READ;
 	}
-	err = inode_permission(realinode, mask);
+	err = inode_permission(&init_user_ns, realinode, mask);
 	revert_creds(old_cred);
 
 	return err;
@@ -353,7 +355,7 @@ int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
 
 	if (!value && !upperdentry) {
 		old_cred = ovl_override_creds(dentry->d_sb);
-		err = vfs_getxattr(realdentry, name, NULL, 0);
+		err = vfs_getxattr(&init_user_ns, realdentry, name, NULL, 0);
 		revert_creds(old_cred);
 		if (err < 0)
 			goto out_drop_write;
@@ -369,10 +371,11 @@ int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
 
 	old_cred = ovl_override_creds(dentry->d_sb);
 	if (value)
-		err = vfs_setxattr(realdentry, name, value, size, flags);
+		err = vfs_setxattr(&init_user_ns, realdentry, name, value, size,
+				   flags);
 	else {
 		WARN_ON(flags != XATTR_REPLACE);
-		err = vfs_removexattr(realdentry, name);
+		err = vfs_removexattr(&init_user_ns, realdentry, name);
 	}
 	revert_creds(old_cred);
 
@@ -394,7 +397,7 @@ int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name,
 		ovl_i_dentry_upper(inode) ?: ovl_dentry_lower(dentry);
 
 	old_cred = ovl_override_creds(dentry->d_sb);
-	res = vfs_getxattr(realdentry, name, value, size);
+	res = vfs_getxattr(&init_user_ns, realdentry, name, value, size);
 	revert_creds(old_cred);
 	return res;
 }
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index cb4e2d60ecf9..95cff83786a5 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -123,7 +123,7 @@ static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox)
 
 static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
 {
-	int err = vfs_rmdir(dir, dentry);
+	int err = vfs_rmdir(&init_user_ns, dir, dentry);
 
 	pr_debug("rmdir(%pd2) = %i\n", dentry, err);
 	return err;
@@ -131,7 +131,7 @@ static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
 
 static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
 {
-	int err = vfs_unlink(dir, dentry, NULL);
+	int err = vfs_unlink(&init_user_ns, dir, dentry, NULL);
 
 	pr_debug("unlink(%pd2) = %i\n", dentry, err);
 	return err;
@@ -140,7 +140,7 @@ static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
 static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
 			      struct dentry *new_dentry)
 {
-	int err = vfs_link(old_dentry, dir, new_dentry, NULL);
+	int err = vfs_link(old_dentry, &init_user_ns, dir, new_dentry, NULL);
 
 	pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err);
 	return err;
@@ -149,7 +149,7 @@ static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
 static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
 				umode_t mode)
 {
-	int err = vfs_create(dir, dentry, mode, true);
+	int err = vfs_create(&init_user_ns, dir, dentry, mode, true);
 
 	pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
 	return err;
@@ -158,7 +158,7 @@ static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
 static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
 			       umode_t mode)
 {
-	int err = vfs_mkdir(dir, dentry, mode);
+	int err = vfs_mkdir(&init_user_ns, dir, dentry, mode);
 	pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
 	return err;
 }
@@ -166,7 +166,7 @@ static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
 static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
 			       umode_t mode, dev_t dev)
 {
-	int err = vfs_mknod(dir, dentry, mode, dev);
+	int err = vfs_mknod(&init_user_ns, dir, dentry, mode, dev);
 
 	pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err);
 	return err;
@@ -175,7 +175,7 @@ static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
 static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
 				 const char *oldname)
 {
-	int err = vfs_symlink(dir, dentry, oldname);
+	int err = vfs_symlink(&init_user_ns, dir, dentry, oldname);
 
 	pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
 	return err;
@@ -186,7 +186,7 @@ static inline ssize_t ovl_do_getxattr(struct ovl_fs *ofs, struct dentry *dentry,
 				      size_t size)
 {
 	const char *name = ovl_xattr(ofs, ox);
-	return vfs_getxattr(dentry, name, value, size);
+	return vfs_getxattr(&init_user_ns, dentry, name, value, size);
 }
 
 static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
@@ -194,7 +194,7 @@ static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
 				  size_t size)
 {
 	const char *name = ovl_xattr(ofs, ox);
-	int err = vfs_setxattr(dentry, name, value, size, 0);
+	int err = vfs_setxattr(&init_user_ns, dentry, name, value, size, 0);
 	pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n",
 		 dentry, name, min((int)size, 48), value, size, err);
 	return err;
@@ -204,7 +204,7 @@ static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry,
 				     enum ovl_xattr ox)
 {
 	const char *name = ovl_xattr(ofs, ox);
-	int err = vfs_removexattr(dentry, name);
+	int err = vfs_removexattr(&init_user_ns, dentry, name);
 	pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
 	return err;
 }
@@ -214,9 +214,18 @@ static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
 				unsigned int flags)
 {
 	int err;
+	struct renamedata rd = {
+		.old_mnt_userns	= &init_user_ns,
+		.old_dir 	= olddir,
+		.old_dentry 	= olddentry,
+		.new_mnt_userns	= &init_user_ns,
+		.new_dir 	= newdir,
+		.new_dentry 	= newdentry,
+		.flags 		= flags,
+	};
 
 	pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags);
-	err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
+	err = vfs_rename(&rd);
 	if (err) {
 		pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
 			 olddentry, newdentry, err);
@@ -226,14 +235,14 @@ static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
 
 static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
 {
-	int err = vfs_whiteout(dir, dentry);
+	int err = vfs_whiteout(&init_user_ns, dir, dentry);
 	pr_debug("whiteout(%pd2) = %i\n", dentry, err);
 	return err;
 }
 
 static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode)
 {
-	struct dentry *ret = vfs_tmpfile(dentry, mode, 0);
+	struct dentry *ret = vfs_tmpfile(&init_user_ns, dentry, mode, 0);
 	int err = PTR_ERR_OR_ZERO(ret);
 
 	pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
@@ -436,10 +445,12 @@ int ovl_set_nlink_lower(struct dentry *dentry);
 unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry,
 			   struct dentry *upperdentry,
 			   unsigned int fallback);
-int ovl_setattr(struct dentry *dentry, struct iattr *attr);
-int ovl_getattr(const struct path *path, struct kstat *stat,
-		u32 request_mask, unsigned int flags);
-int ovl_permission(struct inode *inode, int mask);
+int ovl_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		struct iattr *attr);
+int ovl_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		struct kstat *stat, u32 request_mask, unsigned int flags);
+int ovl_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		   int mask);
 int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
 		  const void *value, size_t size, int flags);
 int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name,
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index d58b8f2bf9d0..fdd72f1a9c5e 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -803,17 +803,19 @@ retry:
 		 * allowed as upper are limited to "normal" ones, where checking
 		 * for the above two errors is sufficient.
 		 */
-		err = vfs_removexattr(work, XATTR_NAME_POSIX_ACL_DEFAULT);
+		err = vfs_removexattr(&init_user_ns, work,
+				      XATTR_NAME_POSIX_ACL_DEFAULT);
 		if (err && err != -ENODATA && err != -EOPNOTSUPP)
 			goto out_dput;
 
-		err = vfs_removexattr(work, XATTR_NAME_POSIX_ACL_ACCESS);
+		err = vfs_removexattr(&init_user_ns, work,
+				      XATTR_NAME_POSIX_ACL_ACCESS);
 		if (err && err != -ENODATA && err != -EOPNOTSUPP)
 			goto out_dput;
 
 		/* Clear any inherited mode bits */
 		inode_lock(work->d_inode);
-		err = notify_change(work, &attr, NULL);
+		err = notify_change(&init_user_ns, work, &attr, NULL);
 		inode_unlock(work->d_inode);
 		if (err)
 			goto out_dput;
@@ -865,6 +867,10 @@ static int ovl_mount_dir_noesc(const char *name, struct path *path)
 		pr_err("filesystem on '%s' not supported\n", name);
 		goto out_put;
 	}
+	if (mnt_user_ns(path->mnt) != &init_user_ns) {
+		pr_err("idmapped layers are currently not supported\n");
+		goto out_put;
+	}
 	if (!d_is_dir(path->dentry)) {
 		pr_err("'%s' not a directory\n", name);
 		goto out_put;
@@ -989,6 +995,7 @@ ovl_posix_acl_xattr_get(const struct xattr_handler *handler,
 
 static int __maybe_unused
 ovl_posix_acl_xattr_set(const struct xattr_handler *handler,
+			struct user_namespace *mnt_userns,
 			struct dentry *dentry, struct inode *inode,
 			const char *name, const void *value,
 			size_t size, int flags)
@@ -1014,7 +1021,7 @@ ovl_posix_acl_xattr_set(const struct xattr_handler *handler,
 		goto out_acl_release;
 	}
 	err = -EPERM;
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(&init_user_ns, inode))
 		goto out_acl_release;
 
 	posix_acl_release(acl);
@@ -1026,10 +1033,10 @@ ovl_posix_acl_xattr_set(const struct xattr_handler *handler,
 	if (unlikely(inode->i_mode & S_ISGID) &&
 	    handler->flags == ACL_TYPE_ACCESS &&
 	    !in_group_p(inode->i_gid) &&
-	    !capable_wrt_inode_uidgid(inode, CAP_FSETID)) {
+	    !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID)) {
 		struct iattr iattr = { .ia_valid = ATTR_KILL_SGID };
 
-		err = ovl_setattr(dentry, &iattr);
+		err = ovl_setattr(&init_user_ns, dentry, &iattr);
 		if (err)
 			return err;
 	}
@@ -1053,6 +1060,7 @@ static int ovl_own_xattr_get(const struct xattr_handler *handler,
 }
 
 static int ovl_own_xattr_set(const struct xattr_handler *handler,
+			     struct user_namespace *mnt_userns,
 			     struct dentry *dentry, struct inode *inode,
 			     const char *name, const void *value,
 			     size_t size, int flags)
@@ -1068,6 +1076,7 @@ static int ovl_other_xattr_get(const struct xattr_handler *handler,
 }
 
 static int ovl_other_xattr_set(const struct xattr_handler *handler,
+			       struct user_namespace *mnt_userns,
 			       struct dentry *dentry, struct inode *inode,
 			       const char *name, const void *value,
 			       size_t size, int flags)
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 9826b003f1d2..7f5a01a11f97 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -479,12 +479,12 @@ struct file *ovl_path_open(struct path *path, int flags)
 		BUG();
 	}
 
-	err = inode_permission(inode, acc_mode | MAY_OPEN);
+	err = inode_permission(&init_user_ns, inode, acc_mode | MAY_OPEN);
 	if (err)
 		return ERR_PTR(err);
 
 	/* O_NOATIME is an optimization, don't fail if not permitted */
-	if (inode_owner_or_capable(inode))
+	if (inode_owner_or_capable(&init_user_ns, inode))
 		flags |= O_NOATIME;
 
 	return dentry_open(path, flags, current_cred());
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 95882b3f5f62..f3309a7edb49 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -345,10 +345,13 @@ EXPORT_SYMBOL(posix_acl_from_mode);
  * by the acl. Returns -E... otherwise.
  */
 int
-posix_acl_permission(struct inode *inode, const struct posix_acl *acl, int want)
+posix_acl_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		     const struct posix_acl *acl, int want)
 {
 	const struct posix_acl_entry *pa, *pe, *mask_obj;
 	int found = 0;
+	kuid_t uid;
+	kgid_t gid;
 
 	want &= MAY_READ | MAY_WRITE | MAY_EXEC;
 
@@ -356,22 +359,26 @@ posix_acl_permission(struct inode *inode, const struct posix_acl *acl, int want)
                 switch(pa->e_tag) {
                         case ACL_USER_OBJ:
 				/* (May have been checked already) */
-				if (uid_eq(inode->i_uid, current_fsuid()))
+				uid = i_uid_into_mnt(mnt_userns, inode);
+				if (uid_eq(uid, current_fsuid()))
                                         goto check_perm;
                                 break;
                         case ACL_USER:
-				if (uid_eq(pa->e_uid, current_fsuid()))
+				uid = kuid_into_mnt(mnt_userns, pa->e_uid);
+				if (uid_eq(uid, current_fsuid()))
                                         goto mask;
 				break;
                         case ACL_GROUP_OBJ:
-                                if (in_group_p(inode->i_gid)) {
+				gid = i_gid_into_mnt(mnt_userns, inode);
+				if (in_group_p(gid)) {
 					found = 1;
 					if ((pa->e_perm & want) == want)
 						goto mask;
                                 }
 				break;
                         case ACL_GROUP:
-				if (in_group_p(pa->e_gid)) {
+				gid = kgid_into_mnt(mnt_userns, pa->e_gid);
+				if (in_group_p(gid)) {
 					found = 1;
 					if ((pa->e_perm & want) == want)
 						goto mask;
@@ -551,8 +558,22 @@ __posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode)
 }
 EXPORT_SYMBOL(__posix_acl_chmod);
 
+/**
+ * posix_acl_chmod - chmod a posix acl
+ *
+ * @mnt_userns:	user namespace of the mount @inode was found from
+ * @inode:	inode to check permissions on
+ * @mode:	the new mode of @inode
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then
+ * take care to map the inode according to @mnt_userns before checking
+ * permissions. On non-idmapped mounts or if permission checking is to be
+ * performed on the raw inode simply passs init_user_ns.
+ */
 int
-posix_acl_chmod(struct inode *inode, umode_t mode)
+ posix_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode,
+		    umode_t mode)
 {
 	struct posix_acl *acl;
 	int ret = 0;
@@ -572,7 +593,7 @@ posix_acl_chmod(struct inode *inode, umode_t mode)
 	ret = __posix_acl_chmod(&acl, GFP_KERNEL, mode);
 	if (ret)
 		return ret;
-	ret = inode->i_op->set_acl(inode, acl, ACL_TYPE_ACCESS);
+	ret = inode->i_op->set_acl(mnt_userns, inode, acl, ACL_TYPE_ACCESS);
 	posix_acl_release(acl);
 	return ret;
 }
@@ -631,9 +652,10 @@ EXPORT_SYMBOL_GPL(posix_acl_create);
 
 /**
  * posix_acl_update_mode  -  update mode in set_acl
- * @inode: target inode
- * @mode_p: mode (pointer) for update
- * @acl: acl pointer
+ * @mnt_userns:	user namespace of the mount @inode was found from
+ * @inode:	target inode
+ * @mode_p:	mode (pointer) for update
+ * @acl:	acl pointer
  *
  * Update the file mode when setting an ACL: compute the new file permission
  * bits based on the ACL.  In addition, if the ACL is equivalent to the new
@@ -642,9 +664,16 @@ EXPORT_SYMBOL_GPL(posix_acl_create);
  * As with chmod, clear the setgid bit if the caller is not in the owning group
  * or capable of CAP_FSETID (see inode_change_ok).
  *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then
+ * take care to map the inode according to @mnt_userns before checking
+ * permissions. On non-idmapped mounts or if permission checking is to be
+ * performed on the raw inode simply passs init_user_ns.
+ *
  * Called from set_acl inode operations.
  */
-int posix_acl_update_mode(struct inode *inode, umode_t *mode_p,
+int posix_acl_update_mode(struct user_namespace *mnt_userns,
+			  struct inode *inode, umode_t *mode_p,
 			  struct posix_acl **acl)
 {
 	umode_t mode = inode->i_mode;
@@ -655,8 +684,8 @@ int posix_acl_update_mode(struct inode *inode, umode_t *mode_p,
 		return error;
 	if (error == 0)
 		*acl = NULL;
-	if (!in_group_p(inode->i_gid) &&
-	    !capable_wrt_inode_uidgid(inode, CAP_FSETID))
+	if (!in_group_p(i_gid_into_mnt(mnt_userns, inode)) &&
+	    !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID))
 		mode &= ~S_ISGID;
 	*mode_p = mode;
 	return 0;
@@ -668,7 +697,8 @@ EXPORT_SYMBOL(posix_acl_update_mode);
  */
 static void posix_acl_fix_xattr_userns(
 	struct user_namespace *to, struct user_namespace *from,
-	void *value, size_t size)
+	struct user_namespace *mnt_userns,
+	void *value, size_t size, bool from_user)
 {
 	struct posix_acl_xattr_header *header = value;
 	struct posix_acl_xattr_entry *entry = (void *)(header + 1), *end;
@@ -693,10 +723,18 @@ static void posix_acl_fix_xattr_userns(
 		switch(le16_to_cpu(entry->e_tag)) {
 		case ACL_USER:
 			uid = make_kuid(from, le32_to_cpu(entry->e_id));
+			if (from_user)
+				uid = kuid_from_mnt(mnt_userns, uid);
+			else
+				uid = kuid_into_mnt(mnt_userns, uid);
 			entry->e_id = cpu_to_le32(from_kuid(to, uid));
 			break;
 		case ACL_GROUP:
 			gid = make_kgid(from, le32_to_cpu(entry->e_id));
+			if (from_user)
+				gid = kgid_from_mnt(mnt_userns, gid);
+			else
+				gid = kgid_into_mnt(mnt_userns, gid);
 			entry->e_id = cpu_to_le32(from_kgid(to, gid));
 			break;
 		default:
@@ -705,20 +743,24 @@ static void posix_acl_fix_xattr_userns(
 	}
 }
 
-void posix_acl_fix_xattr_from_user(void *value, size_t size)
+void posix_acl_fix_xattr_from_user(struct user_namespace *mnt_userns,
+				   void *value, size_t size)
 {
 	struct user_namespace *user_ns = current_user_ns();
-	if (user_ns == &init_user_ns)
+	if ((user_ns == &init_user_ns) && (mnt_userns == &init_user_ns))
 		return;
-	posix_acl_fix_xattr_userns(&init_user_ns, user_ns, value, size);
+	posix_acl_fix_xattr_userns(&init_user_ns, user_ns, mnt_userns, value,
+				   size, true);
 }
 
-void posix_acl_fix_xattr_to_user(void *value, size_t size)
+void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns,
+				 void *value, size_t size)
 {
 	struct user_namespace *user_ns = current_user_ns();
-	if (user_ns == &init_user_ns)
+	if ((user_ns == &init_user_ns) && (mnt_userns == &init_user_ns))
 		return;
-	posix_acl_fix_xattr_userns(user_ns, &init_user_ns, value, size);
+	posix_acl_fix_xattr_userns(user_ns, &init_user_ns, mnt_userns, value,
+				   size, false);
 }
 
 /*
@@ -858,7 +900,8 @@ posix_acl_xattr_get(const struct xattr_handler *handler,
 }
 
 int
-set_posix_acl(struct inode *inode, int type, struct posix_acl *acl)
+set_posix_acl(struct user_namespace *mnt_userns, struct inode *inode,
+	      int type, struct posix_acl *acl)
 {
 	if (!IS_POSIXACL(inode))
 		return -EOPNOTSUPP;
@@ -867,7 +910,7 @@ set_posix_acl(struct inode *inode, int type, struct posix_acl *acl)
 
 	if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
 		return acl ? -EACCES : 0;
-	if (!inode_owner_or_capable(inode))
+	if (!inode_owner_or_capable(mnt_userns, inode))
 		return -EPERM;
 
 	if (acl) {
@@ -875,15 +918,16 @@ set_posix_acl(struct inode *inode, int type, struct posix_acl *acl)
 		if (ret)
 			return ret;
 	}
-	return inode->i_op->set_acl(inode, acl, type);
+	return inode->i_op->set_acl(mnt_userns, inode, acl, type);
 }
 EXPORT_SYMBOL(set_posix_acl);
 
 static int
 posix_acl_xattr_set(const struct xattr_handler *handler,
-		    struct dentry *unused, struct inode *inode,
-		    const char *name, const void *value,
-		    size_t size, int flags)
+			   struct user_namespace *mnt_userns,
+			   struct dentry *unused, struct inode *inode,
+			   const char *name, const void *value, size_t size,
+			   int flags)
 {
 	struct posix_acl *acl = NULL;
 	int ret;
@@ -893,7 +937,7 @@ posix_acl_xattr_set(const struct xattr_handler *handler,
 		if (IS_ERR(acl))
 			return PTR_ERR(acl);
 	}
-	ret = set_posix_acl(inode, handler->flags, acl);
+	ret = set_posix_acl(mnt_userns, inode, handler->flags, acl);
 	posix_acl_release(acl);
 	return ret;
 }
@@ -922,12 +966,13 @@ const struct xattr_handler posix_acl_default_xattr_handler = {
 };
 EXPORT_SYMBOL_GPL(posix_acl_default_xattr_handler);
 
-int simple_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+int simple_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		   struct posix_acl *acl, int type)
 {
 	int error;
 
 	if (type == ACL_TYPE_ACCESS) {
-		error = posix_acl_update_mode(inode,
+		error = posix_acl_update_mode(mnt_userns, inode,
 				&inode->i_mode, &acl);
 		if (error)
 			return error;
diff --git a/fs/proc/base.c b/fs/proc/base.c
index b3422cda2a91..56bf14316122 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -685,7 +685,8 @@ static int proc_fd_access_allowed(struct inode *inode)
 	return allowed;
 }
 
-int proc_setattr(struct dentry *dentry, struct iattr *attr)
+int proc_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		 struct iattr *attr)
 {
 	int error;
 	struct inode *inode = d_inode(dentry);
@@ -693,11 +694,11 @@ int proc_setattr(struct dentry *dentry, struct iattr *attr)
 	if (attr->ia_valid & ATTR_MODE)
 		return -EPERM;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		return error;
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
@@ -726,7 +727,8 @@ static bool has_pid_permissions(struct proc_fs_info *fs_info,
 }
 
 
-static int proc_pid_permission(struct inode *inode, int mask)
+static int proc_pid_permission(struct user_namespace *mnt_userns,
+			       struct inode *inode, int mask)
 {
 	struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb);
 	struct task_struct *task;
@@ -751,7 +753,7 @@ static int proc_pid_permission(struct inode *inode, int mask)
 
 		return -EPERM;
 	}
-	return generic_permission(inode, mask);
+	return generic_permission(&init_user_ns, inode, mask);
 }
 
 
@@ -1927,14 +1929,14 @@ out_unlock:
 	return NULL;
 }
 
-int pid_getattr(const struct path *path, struct kstat *stat,
-		u32 request_mask, unsigned int query_flags)
+int pid_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		struct kstat *stat, u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb);
 	struct task_struct *task;
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 
 	stat->uid = GLOBAL_ROOT_UID;
 	stat->gid = GLOBAL_ROOT_GID;
@@ -3473,7 +3475,8 @@ int proc_pid_readdir(struct file *file, struct dir_context *ctx)
  * This function makes sure that the node is always accessible for members of
  * same thread group.
  */
-static int proc_tid_comm_permission(struct inode *inode, int mask)
+static int proc_tid_comm_permission(struct user_namespace *mnt_userns,
+				    struct inode *inode, int mask)
 {
 	bool is_same_tgroup;
 	struct task_struct *task;
@@ -3492,7 +3495,7 @@ static int proc_tid_comm_permission(struct inode *inode, int mask)
 		return 0;
 	}
 
-	return generic_permission(inode, mask);
+	return generic_permission(&init_user_ns, inode, mask);
 }
 
 static const struct inode_operations proc_tid_comm_inode_operations = {
@@ -3798,12 +3801,13 @@ static int proc_task_readdir(struct file *file, struct dir_context *ctx)
 	return 0;
 }
 
-static int proc_task_getattr(const struct path *path, struct kstat *stat,
+static int proc_task_getattr(struct user_namespace *mnt_userns,
+			     const struct path *path, struct kstat *stat,
 			     u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
 	struct task_struct *p = get_proc_task(inode);
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 
 	if (p) {
 		stat->nlink += get_nr_threads(p);
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index cb51763ed554..07fc4fad2602 100644
--- a/fs/proc/fd.c
+++ b/fs/proc/fd.c
@@ -276,12 +276,13 @@ static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
  * /proc/pid/fd needs a special permission handler so that a process can still
  * access /proc/self/fd after it has executed a setuid().
  */
-int proc_fd_permission(struct inode *inode, int mask)
+int proc_fd_permission(struct user_namespace *mnt_userns,
+		       struct inode *inode, int mask)
 {
 	struct task_struct *p;
 	int rv;
 
-	rv = generic_permission(inode, mask);
+	rv = generic_permission(&init_user_ns, inode, mask);
 	if (rv == 0)
 		return rv;
 
diff --git a/fs/proc/fd.h b/fs/proc/fd.h
index f371a602bf58..c5a921a06a0b 100644
--- a/fs/proc/fd.h
+++ b/fs/proc/fd.h
@@ -10,7 +10,8 @@ extern const struct inode_operations proc_fd_inode_operations;
 extern const struct file_operations proc_fdinfo_operations;
 extern const struct inode_operations proc_fdinfo_inode_operations;
 
-extern int proc_fd_permission(struct inode *inode, int mask);
+extern int proc_fd_permission(struct user_namespace *mnt_userns,
+			      struct inode *inode, int mask);
 
 static inline unsigned int proc_fd(struct inode *inode)
 {
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 6c0a05f55d6b..bc86aa87cc41 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -115,17 +115,18 @@ static bool pde_subdir_insert(struct proc_dir_entry *dir,
 	return true;
 }
 
-static int proc_notify_change(struct dentry *dentry, struct iattr *iattr)
+static int proc_notify_change(struct user_namespace *mnt_userns,
+			      struct dentry *dentry, struct iattr *iattr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct proc_dir_entry *de = PDE(inode);
 	int error;
 
-	error = setattr_prepare(dentry, iattr);
+	error = setattr_prepare(&init_user_ns, dentry, iattr);
 	if (error)
 		return error;
 
-	setattr_copy(inode, iattr);
+	setattr_copy(&init_user_ns, inode, iattr);
 	mark_inode_dirty(inode);
 
 	proc_set_user(de, inode->i_uid, inode->i_gid);
@@ -133,7 +134,8 @@ static int proc_notify_change(struct dentry *dentry, struct iattr *iattr)
 	return 0;
 }
 
-static int proc_getattr(const struct path *path, struct kstat *stat,
+static int proc_getattr(struct user_namespace *mnt_userns,
+			const struct path *path, struct kstat *stat,
 			u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
@@ -145,7 +147,7 @@ static int proc_getattr(const struct path *path, struct kstat *stat,
 		}
 	}
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	return 0;
 }
 
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index f60b379dcdc7..03415f3fb3a8 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -162,8 +162,10 @@ extern int proc_pid_statm(struct seq_file *, struct pid_namespace *,
  * base.c
  */
 extern const struct dentry_operations pid_dentry_operations;
-extern int pid_getattr(const struct path *, struct kstat *, u32, unsigned int);
-extern int proc_setattr(struct dentry *, struct iattr *);
+extern int pid_getattr(struct user_namespace *, const struct path *,
+		       struct kstat *, u32, unsigned int);
+extern int proc_setattr(struct user_namespace *, struct dentry *,
+			struct iattr *);
 extern void proc_pid_evict_inode(struct proc_inode *);
 extern struct inode *proc_pid_make_inode(struct super_block *, struct task_struct *, umode_t);
 extern void pid_update_inode(struct task_struct *, struct inode *);
diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c
index 18601042af99..15c2e55d2ed2 100644
--- a/fs/proc/proc_net.c
+++ b/fs/proc/proc_net.c
@@ -289,7 +289,8 @@ static struct dentry *proc_tgid_net_lookup(struct inode *dir,
 	return de;
 }
 
-static int proc_tgid_net_getattr(const struct path *path, struct kstat *stat,
+static int proc_tgid_net_getattr(struct user_namespace *mnt_userns,
+				 const struct path *path, struct kstat *stat,
 				 u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
@@ -297,7 +298,7 @@ static int proc_tgid_net_getattr(const struct path *path, struct kstat *stat,
 
 	net = get_proc_task_net(inode);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 
 	if (net != NULL) {
 		stat->nlink = net->proc_net->nlink;
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index d2018f70d1fa..656ba24c317d 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -785,7 +785,8 @@ out:
 	return 0;
 }
 
-static int proc_sys_permission(struct inode *inode, int mask)
+static int proc_sys_permission(struct user_namespace *mnt_userns,
+			       struct inode *inode, int mask)
 {
 	/*
 	 * sysctl entries that are not writeable,
@@ -813,7 +814,8 @@ static int proc_sys_permission(struct inode *inode, int mask)
 	return error;
 }
 
-static int proc_sys_setattr(struct dentry *dentry, struct iattr *attr)
+static int proc_sys_setattr(struct user_namespace *mnt_userns,
+			    struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error;
@@ -821,16 +823,17 @@ static int proc_sys_setattr(struct dentry *dentry, struct iattr *attr)
 	if (attr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID))
 		return -EPERM;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		return error;
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
 
-static int proc_sys_getattr(const struct path *path, struct kstat *stat,
+static int proc_sys_getattr(struct user_namespace *mnt_userns,
+			    const struct path *path, struct kstat *stat,
 			    u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
@@ -840,7 +843,7 @@ static int proc_sys_getattr(const struct path *path, struct kstat *stat,
 	if (IS_ERR(head))
 		return PTR_ERR(head);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	if (table)
 		stat->mode = (stat->mode & S_IFMT) | table->mode;
 
diff --git a/fs/proc/root.c b/fs/proc/root.c
index 5e444d4f9717..c7e3b1350ef8 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -308,10 +308,11 @@ void __init proc_root_init(void)
 	register_filesystem(&proc_fs_type);
 }
 
-static int proc_root_getattr(const struct path *path, struct kstat *stat,
+static int proc_root_getattr(struct user_namespace *mnt_userns,
+			     const struct path *path, struct kstat *stat,
 			     u32 request_mask, unsigned int query_flags)
 {
-	generic_fillattr(d_inode(path->dentry), stat);
+	generic_fillattr(&init_user_ns, d_inode(path->dentry), stat);
 	stat->nlink = proc_root.nlink + nr_processes();
 	return 0;
 }
diff --git a/fs/proc_namespace.c b/fs/proc_namespace.c
index eafb75755fa3..392ef5162655 100644
--- a/fs/proc_namespace.c
+++ b/fs/proc_namespace.c
@@ -79,6 +79,9 @@ static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt)
 		if (mnt->mnt_flags & fs_infop->flag)
 			seq_puts(m, fs_infop->str);
 	}
+
+	if (mnt_user_ns(mnt) != &init_user_ns)
+		seq_puts(m, ",idmapped");
 }
 
 static inline void mangle(struct seq_file *m, const char *s)
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 355523f4a4bf..ba3525ccc27e 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -22,7 +22,7 @@
 #include <linux/uaccess.h>
 #include "internal.h"
 
-static int ramfs_nommu_setattr(struct dentry *, struct iattr *);
+static int ramfs_nommu_setattr(struct user_namespace *, struct dentry *, struct iattr *);
 static unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
 						   unsigned long addr,
 						   unsigned long len,
@@ -158,14 +158,15 @@ static int ramfs_nommu_resize(struct inode *inode, loff_t newsize, loff_t size)
  * handle a change of attributes
  * - we're specifically interested in a change of size
  */
-static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia)
+static int ramfs_nommu_setattr(struct user_namespace *mnt_userns,
+			       struct dentry *dentry, struct iattr *ia)
 {
 	struct inode *inode = d_inode(dentry);
 	unsigned int old_ia_valid = ia->ia_valid;
 	int ret = 0;
 
 	/* POSIX UID/GID verification for setting inode attributes */
-	ret = setattr_prepare(dentry, ia);
+	ret = setattr_prepare(&init_user_ns, dentry, ia);
 	if (ret)
 		return ret;
 
@@ -185,7 +186,7 @@ static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia)
 		}
 	}
 
-	setattr_copy(inode, ia);
+	setattr_copy(&init_user_ns, inode, ia);
  out:
 	ia->ia_valid = old_ia_valid;
 	return ret;
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index ee179a81b3da..3c2658c8fde0 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -67,7 +67,7 @@ struct inode *ramfs_get_inode(struct super_block *sb,
 
 	if (inode) {
 		inode->i_ino = get_next_ino();
-		inode_init_owner(inode, dir, mode);
+		inode_init_owner(&init_user_ns, inode, dir, mode);
 		inode->i_mapping->a_ops = &ramfs_aops;
 		mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
 		mapping_set_unevictable(inode->i_mapping);
@@ -101,7 +101,8 @@ struct inode *ramfs_get_inode(struct super_block *sb,
  */
 /* SMP-safe */
 static int
-ramfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
+ramfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+	    struct dentry *dentry, umode_t mode, dev_t dev)
 {
 	struct inode * inode = ramfs_get_inode(dir->i_sb, dir, mode, dev);
 	int error = -ENOSPC;
@@ -115,20 +116,23 @@ ramfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
 	return error;
 }
 
-static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
+static int ramfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode)
 {
-	int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0);
+	int retval = ramfs_mknod(&init_user_ns, dir, dentry, mode | S_IFDIR, 0);
 	if (!retval)
 		inc_nlink(dir);
 	return retval;
 }
 
-static int ramfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
+static int ramfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode, bool excl)
 {
-	return ramfs_mknod(dir, dentry, mode | S_IFREG, 0);
+	return ramfs_mknod(&init_user_ns, dir, dentry, mode | S_IFREG, 0);
 }
 
-static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
+static int ramfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			 struct dentry *dentry, const char *symname)
 {
 	struct inode *inode;
 	int error = -ENOSPC;
diff --git a/fs/reiserfs/acl.h b/fs/reiserfs/acl.h
index 0c1c847f992f..fd58618da360 100644
--- a/fs/reiserfs/acl.h
+++ b/fs/reiserfs/acl.h
@@ -49,7 +49,8 @@ static inline int reiserfs_acl_count(size_t size)
 
 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
 struct posix_acl *reiserfs_get_acl(struct inode *inode, int type);
-int reiserfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+int reiserfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		     struct posix_acl *acl, int type);
 int reiserfs_acl_chmod(struct inode *inode);
 int reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
 				 struct inode *dir, struct dentry *dentry,
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index c76d563dec0e..780bb90c1804 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -3282,13 +3282,14 @@ static ssize_t reiserfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 	return ret;
 }
 
-int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
+int reiserfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		     struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	unsigned int ia_valid;
 	int error;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		return error;
 
@@ -3413,7 +3414,7 @@ int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
 	}
 
 	if (!error) {
-		setattr_copy(inode, attr);
+		setattr_copy(&init_user_ns, inode, attr);
 		mark_inode_dirty(inode);
 	}
 
diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c
index adb21bea3d60..4f1cbd930179 100644
--- a/fs/reiserfs/ioctl.c
+++ b/fs/reiserfs/ioctl.c
@@ -59,7 +59,7 @@ long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 			if (err)
 				break;
 
-			if (!inode_owner_or_capable(inode)) {
+			if (!inode_owner_or_capable(&init_user_ns, inode)) {
 				err = -EPERM;
 				goto setflags_out;
 			}
@@ -101,7 +101,7 @@ setflags_out:
 		err = put_user(inode->i_generation, (int __user *)arg);
 		break;
 	case REISERFS_IOC_SETVERSION:
-		if (!inode_owner_or_capable(inode)) {
+		if (!inode_owner_or_capable(&init_user_ns, inode)) {
 			err = -EPERM;
 			break;
 		}
diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
index 1594687582f0..e6eb05e2b2f1 100644
--- a/fs/reiserfs/namei.c
+++ b/fs/reiserfs/namei.c
@@ -615,12 +615,12 @@ static int new_inode_init(struct inode *inode, struct inode *dir, umode_t mode)
 	 * the quota init calls have to know who to charge the quota to, so
 	 * we have to set uid and gid here
 	 */
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 	return dquot_initialize(inode);
 }
 
-static int reiserfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-			   bool excl)
+static int reiserfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+			   struct dentry *dentry, umode_t mode, bool excl)
 {
 	int retval;
 	struct inode *inode;
@@ -698,8 +698,8 @@ out_failed:
 	return retval;
 }
 
-static int reiserfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
-			  dev_t rdev)
+static int reiserfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+			  struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	int retval;
 	struct inode *inode;
@@ -781,7 +781,8 @@ out_failed:
 	return retval;
 }
 
-static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int reiserfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+			  struct dentry *dentry, umode_t mode)
 {
 	int retval;
 	struct inode *inode;
@@ -1094,8 +1095,9 @@ out_unlink:
 	return retval;
 }
 
-static int reiserfs_symlink(struct inode *parent_dir,
-			    struct dentry *dentry, const char *symname)
+static int reiserfs_symlink(struct user_namespace *mnt_userns,
+			    struct inode *parent_dir, struct dentry *dentry,
+			    const char *symname)
 {
 	int retval;
 	struct inode *inode;
@@ -1304,7 +1306,8 @@ static void set_ino_in_dir_entry(struct reiserfs_dir_entry *de,
  * one path. If it holds 2 or more, it can get into endless waiting in
  * get_empty_nodes or its clones
  */
-static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry,
+static int reiserfs_rename(struct user_namespace *mnt_userns,
+			   struct inode *old_dir, struct dentry *old_dentry,
 			   struct inode *new_dir, struct dentry *new_dentry,
 			   unsigned int flags)
 {
diff --git a/fs/reiserfs/reiserfs.h b/fs/reiserfs/reiserfs.h
index f69871516167..0ca2ac62e534 100644
--- a/fs/reiserfs/reiserfs.h
+++ b/fs/reiserfs/reiserfs.h
@@ -3102,7 +3102,8 @@ static inline void reiserfs_update_sd(struct reiserfs_transaction_handle *th,
 }
 
 void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode);
-int reiserfs_setattr(struct dentry *dentry, struct iattr *attr);
+int reiserfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		     struct iattr *attr);
 
 int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len);
 
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index fe63a7c3e0da..bd073836e141 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -66,14 +66,14 @@
 static int xattr_create(struct inode *dir, struct dentry *dentry, int mode)
 {
 	BUG_ON(!inode_is_locked(dir));
-	return dir->i_op->create(dir, dentry, mode, true);
+	return dir->i_op->create(&init_user_ns, dir, dentry, mode, true);
 }
 #endif
 
 static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 {
 	BUG_ON(!inode_is_locked(dir));
-	return dir->i_op->mkdir(dir, dentry, mode);
+	return dir->i_op->mkdir(&init_user_ns, dir, dentry, mode);
 }
 
 /*
@@ -352,7 +352,7 @@ static int chown_one_xattr(struct dentry *dentry, void *data)
 	 * ATTR_MODE is set.
 	 */
 	attrs->ia_valid &= (ATTR_UID|ATTR_GID);
-	err = reiserfs_setattr(dentry, attrs);
+	err = reiserfs_setattr(&init_user_ns, dentry, attrs);
 	attrs->ia_valid = ia_valid;
 
 	return err;
@@ -604,7 +604,7 @@ reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
 		inode_lock_nested(d_inode(dentry), I_MUTEX_XATTR);
 		inode_dio_wait(d_inode(dentry));
 
-		err = reiserfs_setattr(dentry, &newattrs);
+		err = reiserfs_setattr(&init_user_ns, dentry, &newattrs);
 		inode_unlock(d_inode(dentry));
 	} else
 		update_ctime(inode);
@@ -948,7 +948,8 @@ static int xattr_mount_check(struct super_block *s)
 	return 0;
 }
 
-int reiserfs_permission(struct inode *inode, int mask)
+int reiserfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
+			int mask)
 {
 	/*
 	 * We don't do permission checks on the internal objects.
@@ -957,7 +958,7 @@ int reiserfs_permission(struct inode *inode, int mask)
 	if (IS_PRIVATE(inode))
 		return 0;
 
-	return generic_permission(inode, mask);
+	return generic_permission(&init_user_ns, inode, mask);
 }
 
 static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags)
diff --git a/fs/reiserfs/xattr.h b/fs/reiserfs/xattr.h
index c764352447ba..9b3b06da568c 100644
--- a/fs/reiserfs/xattr.h
+++ b/fs/reiserfs/xattr.h
@@ -16,7 +16,8 @@ int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
 int reiserfs_lookup_privroot(struct super_block *sb);
 int reiserfs_delete_xattrs(struct inode *inode);
 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
-int reiserfs_permission(struct inode *inode, int mask);
+int reiserfs_permission(struct user_namespace *mnt_userns,
+			struct inode *inode, int mask);
 
 #ifdef CONFIG_REISERFS_FS_XATTR
 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c
index ccd40df6eb45..a9547144a099 100644
--- a/fs/reiserfs/xattr_acl.c
+++ b/fs/reiserfs/xattr_acl.c
@@ -18,7 +18,8 @@ static int __reiserfs_set_acl(struct reiserfs_transaction_handle *th,
 
 
 int
-reiserfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+reiserfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		 struct posix_acl *acl, int type)
 {
 	int error, error2;
 	struct reiserfs_transaction_handle th;
@@ -40,7 +41,8 @@ reiserfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 	reiserfs_write_unlock(inode->i_sb);
 	if (error == 0) {
 		if (type == ACL_TYPE_ACCESS && acl) {
-			error = posix_acl_update_mode(inode, &mode, &acl);
+			error = posix_acl_update_mode(&init_user_ns, inode,
+						      &mode, &acl);
 			if (error)
 				goto unlock;
 			update_mode = 1;
@@ -399,5 +401,5 @@ int reiserfs_acl_chmod(struct inode *inode)
 	    !reiserfs_posixacl(inode->i_sb))
 		return 0;
 
-	return posix_acl_chmod(inode, inode->i_mode);
+	return posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
 }
diff --git a/fs/reiserfs/xattr_security.c b/fs/reiserfs/xattr_security.c
index 20be9a0e5870..8965c8e5e172 100644
--- a/fs/reiserfs/xattr_security.c
+++ b/fs/reiserfs/xattr_security.c
@@ -21,7 +21,8 @@ security_get(const struct xattr_handler *handler, struct dentry *unused,
 }
 
 static int
-security_set(const struct xattr_handler *handler, struct dentry *unused,
+security_set(const struct xattr_handler *handler,
+	     struct user_namespace *mnt_userns, struct dentry *unused,
 	     struct inode *inode, const char *name, const void *buffer,
 	     size_t size, int flags)
 {
diff --git a/fs/reiserfs/xattr_trusted.c b/fs/reiserfs/xattr_trusted.c
index 5ed48da3d02b..d853cea2afcd 100644
--- a/fs/reiserfs/xattr_trusted.c
+++ b/fs/reiserfs/xattr_trusted.c
@@ -20,7 +20,8 @@ trusted_get(const struct xattr_handler *handler, struct dentry *unused,
 }
 
 static int
-trusted_set(const struct xattr_handler *handler, struct dentry *unused,
+trusted_set(const struct xattr_handler *handler,
+	    struct user_namespace *mnt_userns, struct dentry *unused,
 	    struct inode *inode, const char *name, const void *buffer,
 	    size_t size, int flags)
 {
diff --git a/fs/reiserfs/xattr_user.c b/fs/reiserfs/xattr_user.c
index a573ca45bacc..65d9cd10a5ea 100644
--- a/fs/reiserfs/xattr_user.c
+++ b/fs/reiserfs/xattr_user.c
@@ -18,7 +18,8 @@ user_get(const struct xattr_handler *handler, struct dentry *unused,
 }
 
 static int
-user_set(const struct xattr_handler *handler, struct dentry *unused,
+user_set(const struct xattr_handler *handler, struct user_namespace *mnt_userns,
+	 struct dentry *unused,
 	 struct inode *inode, const char *name, const void *buffer,
 	 size_t size, int flags)
 {
diff --git a/fs/remap_range.c b/fs/remap_range.c
index 77dba3a49e65..e4a5fdd7ad7b 100644
--- a/fs/remap_range.c
+++ b/fs/remap_range.c
@@ -432,13 +432,16 @@ EXPORT_SYMBOL(vfs_clone_file_range);
 /* Check whether we are allowed to dedupe the destination file */
 static bool allow_file_dedupe(struct file *file)
 {
+	struct user_namespace *mnt_userns = file_mnt_user_ns(file);
+	struct inode *inode = file_inode(file);
+
 	if (capable(CAP_SYS_ADMIN))
 		return true;
 	if (file->f_mode & FMODE_WRITE)
 		return true;
-	if (uid_eq(current_fsuid(), file_inode(file)->i_uid))
+	if (uid_eq(current_fsuid(), i_uid_into_mnt(mnt_userns, inode)))
 		return true;
-	if (!inode_permission(file_inode(file), MAY_WRITE))
+	if (!inode_permission(mnt_userns, inode, MAY_WRITE))
 		return true;
 	return false;
 }
diff --git a/fs/stat.c b/fs/stat.c
index dacecdda2e79..fbc171d038aa 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -26,21 +26,29 @@
 
 /**
  * generic_fillattr - Fill in the basic attributes from the inode struct
- * @inode: Inode to use as the source
- * @stat: Where to fill in the attributes
+ * @mnt_userns:	user namespace of the mount the inode was found from
+ * @inode:	Inode to use as the source
+ * @stat:	Where to fill in the attributes
  *
  * Fill in the basic attributes in the kstat structure from data that's to be
  * found on the VFS inode structure.  This is the default if no getattr inode
  * operation is supplied.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then
+ * take care to map the inode according to @mnt_userns before filling in the
+ * uid and gid filds. On non-idmapped mounts or if permission checking is to be
+ * performed on the raw inode simply passs init_user_ns.
  */
-void generic_fillattr(struct inode *inode, struct kstat *stat)
+void generic_fillattr(struct user_namespace *mnt_userns, struct inode *inode,
+		      struct kstat *stat)
 {
 	stat->dev = inode->i_sb->s_dev;
 	stat->ino = inode->i_ino;
 	stat->mode = inode->i_mode;
 	stat->nlink = inode->i_nlink;
-	stat->uid = inode->i_uid;
-	stat->gid = inode->i_gid;
+	stat->uid = i_uid_into_mnt(mnt_userns, inode);
+	stat->gid = i_gid_into_mnt(mnt_userns, inode);
 	stat->rdev = inode->i_rdev;
 	stat->size = i_size_read(inode);
 	stat->atime = inode->i_atime;
@@ -67,6 +75,7 @@ EXPORT_SYMBOL(generic_fillattr);
 int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
 		      u32 request_mask, unsigned int query_flags)
 {
+	struct user_namespace *mnt_userns;
 	struct inode *inode = d_backing_inode(path->dentry);
 
 	memset(stat, 0, sizeof(*stat));
@@ -83,11 +92,12 @@ int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
 	if (IS_DAX(inode))
 		stat->attributes |= STATX_ATTR_DAX;
 
+	mnt_userns = mnt_user_ns(path->mnt);
 	if (inode->i_op->getattr)
-		return inode->i_op->getattr(path, stat, request_mask,
-					    query_flags);
+		return inode->i_op->getattr(mnt_userns, path, stat,
+					    request_mask, query_flags);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(mnt_userns, inode, stat);
 	return 0;
 }
 EXPORT_SYMBOL(vfs_getattr_nosec);
diff --git a/fs/sysv/file.c b/fs/sysv/file.c
index 45fc79a18594..90e00124ea07 100644
--- a/fs/sysv/file.c
+++ b/fs/sysv/file.c
@@ -29,12 +29,13 @@ const struct file_operations sysv_file_operations = {
 	.splice_read	= generic_file_splice_read,
 };
 
-static int sysv_setattr(struct dentry *dentry, struct iattr *attr)
+static int sysv_setattr(struct user_namespace *mnt_userns,
+			struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		return error;
 
@@ -47,7 +48,7 @@ static int sysv_setattr(struct dentry *dentry, struct iattr *attr)
 		sysv_truncate(inode);
 	}
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
diff --git a/fs/sysv/ialloc.c b/fs/sysv/ialloc.c
index 6c9801986af6..50df794a3c1f 100644
--- a/fs/sysv/ialloc.c
+++ b/fs/sysv/ialloc.c
@@ -163,7 +163,7 @@ struct inode * sysv_new_inode(const struct inode * dir, umode_t mode)
 	*sbi->s_sb_fic_count = cpu_to_fs16(sbi, count);
 	fs16_add(sbi, sbi->s_sb_total_free_inodes, -1);
 	dirty_sb(sb);
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 	inode->i_ino = fs16_to_cpu(sbi, ino);
 	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 	inode->i_blocks = 0;
diff --git a/fs/sysv/itree.c b/fs/sysv/itree.c
index bcb67b0cabe7..8b2e99b7bc9f 100644
--- a/fs/sysv/itree.c
+++ b/fs/sysv/itree.c
@@ -441,11 +441,11 @@ static unsigned sysv_nblocks(struct super_block *s, loff_t size)
 	return blocks;
 }
 
-int sysv_getattr(const struct path *path, struct kstat *stat,
-		 u32 request_mask, unsigned int flags)
+int sysv_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		 struct kstat *stat, u32 request_mask, unsigned int flags)
 {
 	struct super_block *s = path->dentry->d_sb;
-	generic_fillattr(d_inode(path->dentry), stat);
+	generic_fillattr(&init_user_ns, d_inode(path->dentry), stat);
 	stat->blocks = (s->s_blocksize / 512) * sysv_nblocks(s, stat->size);
 	stat->blksize = s->s_blocksize;
 	return 0;
diff --git a/fs/sysv/namei.c b/fs/sysv/namei.c
index ea2414b385ec..b2e6abc06a2d 100644
--- a/fs/sysv/namei.c
+++ b/fs/sysv/namei.c
@@ -41,7 +41,8 @@ static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, un
 	return d_splice_alias(inode, dentry);
 }
 
-static int sysv_mknod(struct inode * dir, struct dentry * dentry, umode_t mode, dev_t rdev)
+static int sysv_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct inode * inode;
 	int err;
@@ -60,13 +61,14 @@ static int sysv_mknod(struct inode * dir, struct dentry * dentry, umode_t mode,
 	return err;
 }
 
-static int sysv_create(struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
+static int sysv_create(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, bool excl)
 {
-	return sysv_mknod(dir, dentry, mode, 0);
+	return sysv_mknod(&init_user_ns, dir, dentry, mode, 0);
 }
 
-static int sysv_symlink(struct inode * dir, struct dentry * dentry, 
-	const char * symname)
+static int sysv_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, const char *symname)
 {
 	int err = -ENAMETOOLONG;
 	int l = strlen(symname)+1;
@@ -108,7 +110,8 @@ static int sysv_link(struct dentry * old_dentry, struct inode * dir,
 	return add_nondir(dentry, inode);
 }
 
-static int sysv_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
+static int sysv_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode)
 {
 	struct inode * inode;
 	int err;
@@ -186,9 +189,9 @@ static int sysv_rmdir(struct inode * dir, struct dentry * dentry)
  * Anybody can rename anything with this: the permission checks are left to the
  * higher-level routines.
  */
-static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
-		       struct inode * new_dir, struct dentry * new_dentry,
-		       unsigned int flags)
+static int sysv_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		       struct dentry *old_dentry, struct inode *new_dir,
+		       struct dentry *new_dentry, unsigned int flags)
 {
 	struct inode * old_inode = d_inode(old_dentry);
 	struct inode * new_inode = d_inode(new_dentry);
diff --git a/fs/sysv/sysv.h b/fs/sysv/sysv.h
index 1cff585526b1..99ddf033da4f 100644
--- a/fs/sysv/sysv.h
+++ b/fs/sysv/sysv.h
@@ -141,7 +141,8 @@ extern struct inode *sysv_iget(struct super_block *, unsigned int);
 extern int sysv_write_inode(struct inode *, struct writeback_control *wbc);
 extern int sysv_sync_inode(struct inode *);
 extern void sysv_set_inode(struct inode *, dev_t);
-extern int sysv_getattr(const struct path *, struct kstat *, u32, unsigned int);
+extern int sysv_getattr(struct user_namespace *, const struct path *,
+			struct kstat *, u32, unsigned int);
 extern int sysv_init_icache(void);
 extern void sysv_destroy_icache(void);
 
diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c
index 0ee8c6dfb036..4b83cbded559 100644
--- a/fs/tracefs/inode.c
+++ b/fs/tracefs/inode.c
@@ -67,7 +67,9 @@ static char *get_dname(struct dentry *dentry)
 	return name;
 }
 
-static int tracefs_syscall_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode)
+static int tracefs_syscall_mkdir(struct user_namespace *mnt_userns,
+				 struct inode *inode, struct dentry *dentry,
+				 umode_t mode)
 {
 	char *name;
 	int ret;
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 9a6b8660425a..d9d8d7794eff 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -94,7 +94,7 @@ struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
 	 */
 	inode->i_flags |= S_NOCMTIME;
 
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 	inode->i_mtime = inode->i_atime = inode->i_ctime =
 			 current_time(inode);
 	inode->i_mapping->nrpages = 0;
@@ -280,8 +280,8 @@ static int ubifs_prepare_create(struct inode *dir, struct dentry *dentry,
 	return fscrypt_setup_filename(dir, &dentry->d_name, 0, nm);
 }
 
-static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-			bool excl)
+static int ubifs_create(struct user_namespace *mnt_userns, struct inode *dir,
+			struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct inode *inode;
 	struct ubifs_info *c = dir->i_sb->s_fs_info;
@@ -441,8 +441,8 @@ out_budg:
 	return err;
 }
 
-static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,
-			 umode_t mode)
+static int ubifs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+			 struct dentry *dentry, umode_t mode)
 {
 	return do_tmpfile(dir, dentry, mode, NULL);
 }
@@ -942,7 +942,8 @@ out_fname:
 	return err;
 }
 
-static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int ubifs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode)
 {
 	struct inode *inode;
 	struct ubifs_inode *dir_ui = ubifs_inode(dir);
@@ -1013,8 +1014,8 @@ out_budg:
 	return err;
 }
 
-static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
-		       umode_t mode, dev_t rdev)
+static int ubifs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct inode *inode;
 	struct ubifs_inode *ui;
@@ -1102,8 +1103,8 @@ out_budg:
 	return err;
 }
 
-static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
-			 const char *symname)
+static int ubifs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+			 struct dentry *dentry, const char *symname)
 {
 	struct inode *inode;
 	struct ubifs_inode *ui;
@@ -1542,7 +1543,8 @@ static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
 	return err;
 }
 
-static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
+static int ubifs_rename(struct user_namespace *mnt_userns,
+			struct inode *old_dir, struct dentry *old_dentry,
 			struct inode *new_dir, struct dentry *new_dentry,
 			unsigned int flags)
 {
@@ -1566,8 +1568,8 @@ static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
 }
 
-int ubifs_getattr(const struct path *path, struct kstat *stat,
-		  u32 request_mask, unsigned int flags)
+int ubifs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		  struct kstat *stat, u32 request_mask, unsigned int flags)
 {
 	loff_t size;
 	struct inode *inode = d_inode(path->dentry);
@@ -1589,7 +1591,7 @@ int ubifs_getattr(const struct path *path, struct kstat *stat,
 				STATX_ATTR_ENCRYPTED |
 				STATX_ATTR_IMMUTABLE);
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	stat->blksize = UBIFS_BLOCK_SIZE;
 	stat->size = ui->ui_size;
 
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 2bc7780d2963..0e4b4be3aa26 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1257,7 +1257,8 @@ static int do_setattr(struct ubifs_info *c, struct inode *inode,
 	return err;
 }
 
-int ubifs_setattr(struct dentry *dentry, struct iattr *attr)
+int ubifs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		  struct iattr *attr)
 {
 	int err;
 	struct inode *inode = d_inode(dentry);
@@ -1265,7 +1266,7 @@ int ubifs_setattr(struct dentry *dentry, struct iattr *attr)
 
 	dbg_gen("ino %lu, mode %#x, ia_valid %#x",
 		inode->i_ino, inode->i_mode, attr->ia_valid);
-	err = setattr_prepare(dentry, attr);
+	err = setattr_prepare(&init_user_ns, dentry, attr);
 	if (err)
 		return err;
 
diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c
index 4363d85a3fd4..2326d5122beb 100644
--- a/fs/ubifs/ioctl.c
+++ b/fs/ubifs/ioctl.c
@@ -155,7 +155,7 @@ long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		if (IS_RDONLY(inode))
 			return -EROFS;
 
-		if (!inode_owner_or_capable(inode))
+		if (!inode_owner_or_capable(&init_user_ns, inode))
 			return -EACCES;
 
 		if (get_user(flags, (int __user *) arg))
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index fc2cdde3b549..7fdfdbda4b8a 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1989,13 +1989,14 @@ int ubifs_calc_dark(const struct ubifs_info *c, int spc);
 
 /* file.c */
 int ubifs_fsync(struct file *file, loff_t start, loff_t end, int datasync);
-int ubifs_setattr(struct dentry *dentry, struct iattr *attr);
+int ubifs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		  struct iattr *attr);
 int ubifs_update_time(struct inode *inode, struct timespec64 *time, int flags);
 
 /* dir.c */
 struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
 			      umode_t mode);
-int ubifs_getattr(const struct path *path, struct kstat *stat,
+int ubifs_getattr(struct user_namespace *mnt_userns, const struct path *path, struct kstat *stat,
 		  u32 request_mask, unsigned int flags);
 int ubifs_check_dir_empty(struct inode *dir);
 
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index 842d5f14545d..6b1e9830b274 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -681,6 +681,7 @@ static int xattr_get(const struct xattr_handler *handler,
 }
 
 static int xattr_set(const struct xattr_handler *handler,
+			   struct user_namespace *mnt_userns,
 			   struct dentry *dentry, struct inode *inode,
 			   const char *name, const void *value,
 			   size_t size, int flags)
diff --git a/fs/udf/file.c b/fs/udf/file.c
index ad8eefad27d7..2846dcd92197 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -183,7 +183,7 @@ long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	long old_block, new_block;
 	int result;
 
-	if (inode_permission(inode, MAY_READ) != 0) {
+	if (file_permission(filp, MAY_READ) != 0) {
 		udf_debug("no permission to access inode %lu\n", inode->i_ino);
 		return -EPERM;
 	}
@@ -253,13 +253,14 @@ const struct file_operations udf_file_operations = {
 	.llseek			= generic_file_llseek,
 };
 
-static int udf_setattr(struct dentry *dentry, struct iattr *attr)
+static int udf_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		       struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct super_block *sb = inode->i_sb;
 	int error;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		return error;
 
@@ -282,7 +283,7 @@ static int udf_setattr(struct dentry *dentry, struct iattr *attr)
 	if (attr->ia_valid & ATTR_MODE)
 		udf_update_extra_perms(inode, attr->ia_mode);
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
diff --git a/fs/udf/ialloc.c b/fs/udf/ialloc.c
index 84ed23edebfd..2ecf0e87660e 100644
--- a/fs/udf/ialloc.c
+++ b/fs/udf/ialloc.c
@@ -103,7 +103,7 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode)
 		mutex_unlock(&sbi->s_alloc_mutex);
 	}
 
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
 		inode->i_uid = sbi->s_uid;
 	if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index e169d8fe35b5..f146b3089f3d 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -604,8 +604,8 @@ static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 	return 0;
 }
 
-static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		      bool excl)
+static int udf_create(struct user_namespace *mnt_userns, struct inode *dir,
+		      struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct inode *inode = udf_new_inode(dir, mode);
 
@@ -623,7 +623,8 @@ static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 	return udf_add_nondir(dentry, inode);
 }
 
-static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, umode_t mode)
 {
 	struct inode *inode = udf_new_inode(dir, mode);
 
@@ -642,8 +643,8 @@ static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 	return 0;
 }
 
-static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
-		     dev_t rdev)
+static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct inode *inode;
 
@@ -658,7 +659,8 @@ static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 	return udf_add_nondir(dentry, inode);
 }
 
-static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, umode_t mode)
 {
 	struct inode *inode;
 	struct udf_fileident_bh fibh;
@@ -877,8 +879,8 @@ out:
 	return retval;
 }
 
-static int udf_symlink(struct inode *dir, struct dentry *dentry,
-		       const char *symname)
+static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+		       struct dentry *dentry, const char *symname)
 {
 	struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
 	struct pathComponent *pc;
@@ -1065,9 +1067,9 @@ static int udf_link(struct dentry *old_dentry, struct inode *dir,
 /* Anybody can rename anything with this: the permission checks are left to the
  * higher-level routines.
  */
-static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
-		      struct inode *new_dir, struct dentry *new_dentry,
-		      unsigned int flags)
+static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		      struct dentry *old_dentry, struct inode *new_dir,
+		      struct dentry *new_dentry, unsigned int flags)
 {
 	struct inode *old_inode = d_inode(old_dentry);
 	struct inode *new_inode = d_inode(new_dentry);
diff --git a/fs/udf/symlink.c b/fs/udf/symlink.c
index c973db239604..9b223421a3c5 100644
--- a/fs/udf/symlink.c
+++ b/fs/udf/symlink.c
@@ -152,14 +152,15 @@ out_unmap:
 	return err;
 }
 
-static int udf_symlink_getattr(const struct path *path, struct kstat *stat,
-				u32 request_mask, unsigned int flags)
+static int udf_symlink_getattr(struct user_namespace *mnt_userns,
+			       const struct path *path, struct kstat *stat,
+			       u32 request_mask, unsigned int flags)
 {
 	struct dentry *dentry = path->dentry;
 	struct inode *inode = d_backing_inode(dentry);
 	struct page *page;
 
-	generic_fillattr(inode, stat);
+	generic_fillattr(&init_user_ns, inode, stat);
 	page = read_mapping_page(inode->i_mapping, 0, NULL);
 	if (IS_ERR(page))
 		return PTR_ERR(page);
diff --git a/fs/ufs/ialloc.c b/fs/ufs/ialloc.c
index 969fd60436d3..7e3e08c0166f 100644
--- a/fs/ufs/ialloc.c
+++ b/fs/ufs/ialloc.c
@@ -289,7 +289,7 @@ cg_found:
 	ufs_mark_sb_dirty(sb);
 
 	inode->i_ino = cg * uspi->s_ipg + bit;
-	inode_init_owner(inode, dir, mode);
+	inode_init_owner(&init_user_ns, inode, dir, mode);
 	inode->i_blocks = 0;
 	inode->i_generation = 0;
 	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index c843ec858cf7..debc282c1bb4 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -1211,13 +1211,14 @@ out:
 	return err;
 }
 
-int ufs_setattr(struct dentry *dentry, struct iattr *attr)
+int ufs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	unsigned int ia_valid = attr->ia_valid;
 	int error;
 
-	error = setattr_prepare(dentry, attr);
+	error = setattr_prepare(&init_user_ns, dentry, attr);
 	if (error)
 		return error;
 
@@ -1227,7 +1228,7 @@ int ufs_setattr(struct dentry *dentry, struct iattr *attr)
 			return error;
 	}
 
-	setattr_copy(inode, attr);
+	setattr_copy(&init_user_ns, inode, attr);
 	mark_inode_dirty(inode);
 	return 0;
 }
diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
index 9ef40f100415..29d5a0e0c8f0 100644
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -69,7 +69,8 @@ static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsi
  * If the create succeeds, we fill in the inode information
  * with d_instantiate(). 
  */
-static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
+static int ufs_create (struct user_namespace * mnt_userns,
+		struct inode * dir, struct dentry * dentry, umode_t mode,
 		bool excl)
 {
 	struct inode *inode;
@@ -85,7 +86,8 @@ static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
 	return ufs_add_nondir(dentry, inode);
 }
 
-static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
+static int ufs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+		     struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct inode *inode;
 	int err;
@@ -104,8 +106,8 @@ static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev
 	return err;
 }
 
-static int ufs_symlink (struct inode * dir, struct dentry * dentry,
-	const char * symname)
+static int ufs_symlink (struct user_namespace * mnt_userns, struct inode * dir,
+	struct dentry * dentry, const char * symname)
 {
 	struct super_block * sb = dir->i_sb;
 	int err;
@@ -164,7 +166,8 @@ static int ufs_link (struct dentry * old_dentry, struct inode * dir,
 	return error;
 }
 
-static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
+static int ufs_mkdir(struct user_namespace * mnt_userns, struct inode * dir,
+	struct dentry * dentry, umode_t mode)
 {
 	struct inode * inode;
 	int err;
@@ -240,9 +243,9 @@ static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
 	return err;
 }
 
-static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
-		      struct inode *new_dir, struct dentry *new_dentry,
-		      unsigned int flags)
+static int ufs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+		      struct dentry *old_dentry, struct inode *new_dir,
+		      struct dentry *new_dentry, unsigned int flags)
 {
 	struct inode *old_inode = d_inode(old_dentry);
 	struct inode *new_inode = d_inode(new_dentry);
diff --git a/fs/ufs/ufs.h b/fs/ufs/ufs.h
index b49e0efdf3d7..550f7c5a3636 100644
--- a/fs/ufs/ufs.h
+++ b/fs/ufs/ufs.h
@@ -123,7 +123,8 @@ extern struct inode *ufs_iget(struct super_block *, unsigned long);
 extern int ufs_write_inode (struct inode *, struct writeback_control *);
 extern int ufs_sync_inode (struct inode *);
 extern void ufs_evict_inode (struct inode *);
-extern int ufs_setattr(struct dentry *dentry, struct iattr *attr);
+extern int ufs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		       struct iattr *attr);
 
 /* namei.c */
 extern const struct file_operations ufs_dir_operations;
diff --git a/fs/utimes.c b/fs/utimes.c
index fd3cc4226224..39f356017635 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -62,7 +62,8 @@ int vfs_utimes(const struct path *path, struct timespec64 *times)
 	}
 retry_deleg:
 	inode_lock(inode);
-	error = notify_change(path->dentry, &newattrs, &delegated_inode);
+	error = notify_change(mnt_user_ns(path->mnt), path->dentry, &newattrs,
+			      &delegated_inode);
 	inode_unlock(inode);
 	if (delegated_inode) {
 		error = break_deleg_wait(&delegated_inode);
diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c
index 4d569f14a8d8..7aee0ec63ade 100644
--- a/fs/vboxsf/dir.c
+++ b/fs/vboxsf/dir.c
@@ -288,13 +288,15 @@ static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry,
 	return 0;
 }
 
-static int vboxsf_dir_mkfile(struct inode *parent, struct dentry *dentry,
+static int vboxsf_dir_mkfile(struct user_namespace *mnt_userns,
+			     struct inode *parent, struct dentry *dentry,
 			     umode_t mode, bool excl)
 {
 	return vboxsf_dir_create(parent, dentry, mode, 0);
 }
 
-static int vboxsf_dir_mkdir(struct inode *parent, struct dentry *dentry,
+static int vboxsf_dir_mkdir(struct user_namespace *mnt_userns,
+			    struct inode *parent, struct dentry *dentry,
 			    umode_t mode)
 {
 	return vboxsf_dir_create(parent, dentry, mode, 1);
@@ -332,7 +334,8 @@ static int vboxsf_dir_unlink(struct inode *parent, struct dentry *dentry)
 	return 0;
 }
 
-static int vboxsf_dir_rename(struct inode *old_parent,
+static int vboxsf_dir_rename(struct user_namespace *mnt_userns,
+			     struct inode *old_parent,
 			     struct dentry *old_dentry,
 			     struct inode *new_parent,
 			     struct dentry *new_dentry,
@@ -374,7 +377,8 @@ err_put_old_path:
 	return err;
 }
 
-static int vboxsf_dir_symlink(struct inode *parent, struct dentry *dentry,
+static int vboxsf_dir_symlink(struct user_namespace *mnt_userns,
+			      struct inode *parent, struct dentry *dentry,
 			      const char *symname)
 {
 	struct vboxsf_inode *sf_parent_i = VBOXSF_I(parent);
diff --git a/fs/vboxsf/utils.c b/fs/vboxsf/utils.c
index 018057546067..3b847e3fba24 100644
--- a/fs/vboxsf/utils.c
+++ b/fs/vboxsf/utils.c
@@ -212,8 +212,8 @@ int vboxsf_inode_revalidate(struct dentry *dentry)
 	return 0;
 }
 
-int vboxsf_getattr(const struct path *path, struct kstat *kstat,
-		   u32 request_mask, unsigned int flags)
+int vboxsf_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		   struct kstat *kstat, u32 request_mask, unsigned int flags)
 {
 	int err;
 	struct dentry *dentry = path->dentry;
@@ -233,11 +233,12 @@ int vboxsf_getattr(const struct path *path, struct kstat *kstat,
 	if (err)
 		return err;
 
-	generic_fillattr(d_inode(dentry), kstat);
+	generic_fillattr(&init_user_ns, d_inode(dentry), kstat);
 	return 0;
 }
 
-int vboxsf_setattr(struct dentry *dentry, struct iattr *iattr)
+int vboxsf_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		   struct iattr *iattr)
 {
 	struct vboxsf_inode *sf_i = VBOXSF_I(d_inode(dentry));
 	struct vboxsf_sbi *sbi = VBOXSF_SBI(dentry->d_sb);
diff --git a/fs/vboxsf/vfsmod.h b/fs/vboxsf/vfsmod.h
index 18f95b00fc33..760524e78c88 100644
--- a/fs/vboxsf/vfsmod.h
+++ b/fs/vboxsf/vfsmod.h
@@ -90,9 +90,11 @@ int vboxsf_stat(struct vboxsf_sbi *sbi, struct shfl_string *path,
 		struct shfl_fsobjinfo *info);
 int vboxsf_stat_dentry(struct dentry *dentry, struct shfl_fsobjinfo *info);
 int vboxsf_inode_revalidate(struct dentry *dentry);
-int vboxsf_getattr(const struct path *path, struct kstat *kstat,
-		   u32 request_mask, unsigned int query_flags);
-int vboxsf_setattr(struct dentry *dentry, struct iattr *iattr);
+int vboxsf_getattr(struct user_namespace *mnt_userns, const struct path *path,
+		   struct kstat *kstat, u32 request_mask,
+		   unsigned int query_flags);
+int vboxsf_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		   struct iattr *iattr);
 struct shfl_string *vboxsf_path_from_dentry(struct vboxsf_sbi *sbi,
 					    struct dentry *dentry);
 int vboxsf_nlscpy(struct vboxsf_sbi *sbi, char *name, size_t name_bound_len,
diff --git a/fs/verity/enable.c b/fs/verity/enable.c
index f7e997a01ad0..77e159a0346b 100644
--- a/fs/verity/enable.c
+++ b/fs/verity/enable.c
@@ -369,7 +369,7 @@ int fsverity_ioctl_enable(struct file *filp, const void __user *uarg)
 	 * has verity enabled, and to stabilize the data being hashed.
 	 */
 
-	err = inode_permission(inode, MAY_WRITE);
+	err = file_permission(filp, MAY_WRITE);
 	if (err)
 		return err;
 
diff --git a/fs/xattr.c b/fs/xattr.c
index fd57153b1f61..b3444e06cded 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -83,7 +83,8 @@ xattr_resolve_name(struct inode *inode, const char **name)
  * because different namespaces have very different rules.
  */
 static int
-xattr_permission(struct inode *inode, const char *name, int mask)
+xattr_permission(struct user_namespace *mnt_userns, struct inode *inode,
+		 const char *name, int mask)
 {
 	/*
 	 * We can never set or remove an extended attribute on a read-only
@@ -97,7 +98,7 @@ xattr_permission(struct inode *inode, const char *name, int mask)
 		 * to be writen back improperly if their true value is
 		 * unknown to the vfs.
 		 */
-		if (HAS_UNMAPPED_ID(inode))
+		if (HAS_UNMAPPED_ID(mnt_userns, inode))
 			return -EPERM;
 	}
 
@@ -127,11 +128,12 @@ xattr_permission(struct inode *inode, const char *name, int mask)
 		if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
 			return (mask & MAY_WRITE) ? -EPERM : -ENODATA;
 		if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
-		    (mask & MAY_WRITE) && !inode_owner_or_capable(inode))
+		    (mask & MAY_WRITE) &&
+		    !inode_owner_or_capable(mnt_userns, inode))
 			return -EPERM;
 	}
 
-	return inode_permission(inode, mask);
+	return inode_permission(mnt_userns, inode, mask);
 }
 
 /*
@@ -162,8 +164,9 @@ xattr_supported_namespace(struct inode *inode, const char *prefix)
 EXPORT_SYMBOL(xattr_supported_namespace);
 
 int
-__vfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
-	       const void *value, size_t size, int flags)
+__vfs_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+	       struct inode *inode, const char *name, const void *value,
+	       size_t size, int flags)
 {
 	const struct xattr_handler *handler;
 
@@ -174,7 +177,8 @@ __vfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
 		return -EOPNOTSUPP;
 	if (size == 0)
 		value = "";  /* empty EA, do not remove */
-	return handler->set(handler, dentry, inode, name, value, size, flags);
+	return handler->set(handler, mnt_userns, dentry, inode, name, value,
+			    size, flags);
 }
 EXPORT_SYMBOL(__vfs_setxattr);
 
@@ -182,6 +186,7 @@ EXPORT_SYMBOL(__vfs_setxattr);
  *  __vfs_setxattr_noperm - perform setxattr operation without performing
  *  permission checks.
  *
+ *  @mnt_userns - user namespace of the mount the inode was found from
  *  @dentry - object to perform setxattr on
  *  @name - xattr name to set
  *  @value - value to set @name to
@@ -194,8 +199,9 @@ EXPORT_SYMBOL(__vfs_setxattr);
  *  is executed. It also assumes that the caller will make the appropriate
  *  permission checks.
  */
-int __vfs_setxattr_noperm(struct dentry *dentry, const char *name,
-		const void *value, size_t size, int flags)
+int __vfs_setxattr_noperm(struct user_namespace *mnt_userns,
+			  struct dentry *dentry, const char *name,
+			  const void *value, size_t size, int flags)
 {
 	struct inode *inode = dentry->d_inode;
 	int error = -EAGAIN;
@@ -205,7 +211,8 @@ int __vfs_setxattr_noperm(struct dentry *dentry, const char *name,
 	if (issec)
 		inode->i_flags &= ~S_NOSEC;
 	if (inode->i_opflags & IOP_XATTR) {
-		error = __vfs_setxattr(dentry, inode, name, value, size, flags);
+		error = __vfs_setxattr(mnt_userns, dentry, inode, name, value,
+				       size, flags);
 		if (!error) {
 			fsnotify_xattr(dentry);
 			security_inode_post_setxattr(dentry, name, value,
@@ -244,18 +251,19 @@ int __vfs_setxattr_noperm(struct dentry *dentry, const char *name,
  *  a delegation was broken on, NULL if none.
  */
 int
-__vfs_setxattr_locked(struct dentry *dentry, const char *name,
-		const void *value, size_t size, int flags,
-		struct inode **delegated_inode)
+__vfs_setxattr_locked(struct user_namespace *mnt_userns, struct dentry *dentry,
+		      const char *name, const void *value, size_t size,
+		      int flags, struct inode **delegated_inode)
 {
 	struct inode *inode = dentry->d_inode;
 	int error;
 
-	error = xattr_permission(inode, name, MAY_WRITE);
+	error = xattr_permission(mnt_userns, inode, name, MAY_WRITE);
 	if (error)
 		return error;
 
-	error = security_inode_setxattr(dentry, name, value, size, flags);
+	error = security_inode_setxattr(mnt_userns, dentry, name, value, size,
+					flags);
 	if (error)
 		goto out;
 
@@ -263,7 +271,8 @@ __vfs_setxattr_locked(struct dentry *dentry, const char *name,
 	if (error)
 		goto out;
 
-	error = __vfs_setxattr_noperm(dentry, name, value, size, flags);
+	error = __vfs_setxattr_noperm(mnt_userns, dentry, name, value,
+				      size, flags);
 
 out:
 	return error;
@@ -271,8 +280,8 @@ out:
 EXPORT_SYMBOL_GPL(__vfs_setxattr_locked);
 
 int
-vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
-		size_t size, int flags)
+vfs_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+	     const char *name, const void *value, size_t size, int flags)
 {
 	struct inode *inode = dentry->d_inode;
 	struct inode *delegated_inode = NULL;
@@ -280,7 +289,7 @@ vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 	int error;
 
 	if (size && strcmp(name, XATTR_NAME_CAPS) == 0) {
-		error = cap_convert_nscap(dentry, &value, size);
+		error = cap_convert_nscap(mnt_userns, dentry, &value, size);
 		if (error < 0)
 			return error;
 		size = error;
@@ -288,8 +297,8 @@ vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 
 retry_deleg:
 	inode_lock(inode);
-	error = __vfs_setxattr_locked(dentry, name, value, size, flags,
-	    &delegated_inode);
+	error = __vfs_setxattr_locked(mnt_userns, dentry, name, value, size,
+				      flags, &delegated_inode);
 	inode_unlock(inode);
 
 	if (delegated_inode) {
@@ -305,18 +314,20 @@ retry_deleg:
 EXPORT_SYMBOL_GPL(vfs_setxattr);
 
 static ssize_t
-xattr_getsecurity(struct inode *inode, const char *name, void *value,
-			size_t size)
+xattr_getsecurity(struct user_namespace *mnt_userns, struct inode *inode,
+		  const char *name, void *value, size_t size)
 {
 	void *buffer = NULL;
 	ssize_t len;
 
 	if (!value || !size) {
-		len = security_inode_getsecurity(inode, name, &buffer, false);
+		len = security_inode_getsecurity(mnt_userns, inode, name,
+						 &buffer, false);
 		goto out_noalloc;
 	}
 
-	len = security_inode_getsecurity(inode, name, &buffer, true);
+	len = security_inode_getsecurity(mnt_userns, inode, name, &buffer,
+					 true);
 	if (len < 0)
 		return len;
 	if (size < len) {
@@ -339,15 +350,16 @@ out_noalloc:
  * Returns the result of alloc, if failed, or the getxattr operation.
  */
 ssize_t
-vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value,
-		   size_t xattr_size, gfp_t flags)
+vfs_getxattr_alloc(struct user_namespace *mnt_userns, struct dentry *dentry,
+		   const char *name, char **xattr_value, size_t xattr_size,
+		   gfp_t flags)
 {
 	const struct xattr_handler *handler;
 	struct inode *inode = dentry->d_inode;
 	char *value = *xattr_value;
 	int error;
 
-	error = xattr_permission(inode, name, MAY_READ);
+	error = xattr_permission(mnt_userns, inode, name, MAY_READ);
 	if (error)
 		return error;
 
@@ -388,12 +400,13 @@ __vfs_getxattr(struct dentry *dentry, struct inode *inode, const char *name,
 EXPORT_SYMBOL(__vfs_getxattr);
 
 ssize_t
-vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
+vfs_getxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+	     const char *name, void *value, size_t size)
 {
 	struct inode *inode = dentry->d_inode;
 	int error;
 
-	error = xattr_permission(inode, name, MAY_READ);
+	error = xattr_permission(mnt_userns, inode, name, MAY_READ);
 	if (error)
 		return error;
 
@@ -404,7 +417,8 @@ vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
 	if (!strncmp(name, XATTR_SECURITY_PREFIX,
 				XATTR_SECURITY_PREFIX_LEN)) {
 		const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
-		int ret = xattr_getsecurity(inode, suffix, value, size);
+		int ret = xattr_getsecurity(mnt_userns, inode, suffix, value,
+					    size);
 		/*
 		 * Only overwrite the return value if a security module
 		 * is actually active.
@@ -439,7 +453,8 @@ vfs_listxattr(struct dentry *dentry, char *list, size_t size)
 EXPORT_SYMBOL_GPL(vfs_listxattr);
 
 int
-__vfs_removexattr(struct dentry *dentry, const char *name)
+__vfs_removexattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		  const char *name)
 {
 	struct inode *inode = d_inode(dentry);
 	const struct xattr_handler *handler;
@@ -449,7 +464,8 @@ __vfs_removexattr(struct dentry *dentry, const char *name)
 		return PTR_ERR(handler);
 	if (!handler->set)
 		return -EOPNOTSUPP;
-	return handler->set(handler, dentry, inode, name, NULL, 0, XATTR_REPLACE);
+	return handler->set(handler, mnt_userns, dentry, inode, name, NULL, 0,
+			    XATTR_REPLACE);
 }
 EXPORT_SYMBOL(__vfs_removexattr);
 
@@ -463,17 +479,18 @@ EXPORT_SYMBOL(__vfs_removexattr);
  *  a delegation was broken on, NULL if none.
  */
 int
-__vfs_removexattr_locked(struct dentry *dentry, const char *name,
-		struct inode **delegated_inode)
+__vfs_removexattr_locked(struct user_namespace *mnt_userns,
+			 struct dentry *dentry, const char *name,
+			 struct inode **delegated_inode)
 {
 	struct inode *inode = dentry->d_inode;
 	int error;
 
-	error = xattr_permission(inode, name, MAY_WRITE);
+	error = xattr_permission(mnt_userns, inode, name, MAY_WRITE);
 	if (error)
 		return error;
 
-	error = security_inode_removexattr(dentry, name);
+	error = security_inode_removexattr(mnt_userns, dentry, name);
 	if (error)
 		goto out;
 
@@ -481,7 +498,7 @@ __vfs_removexattr_locked(struct dentry *dentry, const char *name,
 	if (error)
 		goto out;
 
-	error = __vfs_removexattr(dentry, name);
+	error = __vfs_removexattr(mnt_userns, dentry, name);
 
 	if (!error) {
 		fsnotify_xattr(dentry);
@@ -494,7 +511,8 @@ out:
 EXPORT_SYMBOL_GPL(__vfs_removexattr_locked);
 
 int
-vfs_removexattr(struct dentry *dentry, const char *name)
+vfs_removexattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+		const char *name)
 {
 	struct inode *inode = dentry->d_inode;
 	struct inode *delegated_inode = NULL;
@@ -502,7 +520,8 @@ vfs_removexattr(struct dentry *dentry, const char *name)
 
 retry_deleg:
 	inode_lock(inode);
-	error = __vfs_removexattr_locked(dentry, name, &delegated_inode);
+	error = __vfs_removexattr_locked(mnt_userns, dentry,
+					 name, &delegated_inode);
 	inode_unlock(inode);
 
 	if (delegated_inode) {
@@ -519,8 +538,9 @@ EXPORT_SYMBOL_GPL(vfs_removexattr);
  * Extended attribute SET operations
  */
 static long
-setxattr(struct dentry *d, const char __user *name, const void __user *value,
-	 size_t size, int flags)
+setxattr(struct user_namespace *mnt_userns, struct dentry *d,
+	 const char __user *name, const void __user *value, size_t size,
+	 int flags)
 {
 	int error;
 	void *kvalue = NULL;
@@ -547,10 +567,10 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
 		}
 		if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
 		    (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
-			posix_acl_fix_xattr_from_user(kvalue, size);
+			posix_acl_fix_xattr_from_user(mnt_userns, kvalue, size);
 	}
 
-	error = vfs_setxattr(d, kname, kvalue, size, flags);
+	error = vfs_setxattr(mnt_userns, d, kname, kvalue, size, flags);
 out:
 	kvfree(kvalue);
 
@@ -563,13 +583,15 @@ static int path_setxattr(const char __user *pathname,
 {
 	struct path path;
 	int error;
+
 retry:
 	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
 	if (error)
 		return error;
 	error = mnt_want_write(path.mnt);
 	if (!error) {
-		error = setxattr(path.dentry, name, value, size, flags);
+		error = setxattr(mnt_user_ns(path.mnt), path.dentry, name,
+				 value, size, flags);
 		mnt_drop_write(path.mnt);
 	}
 	path_put(&path);
@@ -605,7 +627,9 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
 	audit_file(f.file);
 	error = mnt_want_write_file(f.file);
 	if (!error) {
-		error = setxattr(f.file->f_path.dentry, name, value, size, flags);
+		error = setxattr(file_mnt_user_ns(f.file),
+				 f.file->f_path.dentry, name,
+				 value, size, flags);
 		mnt_drop_write_file(f.file);
 	}
 	fdput(f);
@@ -616,8 +640,8 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
  * Extended attribute GET operations
  */
 static ssize_t
-getxattr(struct dentry *d, const char __user *name, void __user *value,
-	 size_t size)
+getxattr(struct user_namespace *mnt_userns, struct dentry *d,
+	 const char __user *name, void __user *value, size_t size)
 {
 	ssize_t error;
 	void *kvalue = NULL;
@@ -637,11 +661,11 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
 			return -ENOMEM;
 	}
 
-	error = vfs_getxattr(d, kname, kvalue, size);
+	error = vfs_getxattr(mnt_userns, d, kname, kvalue, size);
 	if (error > 0) {
 		if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
 		    (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
-			posix_acl_fix_xattr_to_user(kvalue, error);
+			posix_acl_fix_xattr_to_user(mnt_userns, kvalue, error);
 		if (size && copy_to_user(value, kvalue, error))
 			error = -EFAULT;
 	} else if (error == -ERANGE && size >= XATTR_SIZE_MAX) {
@@ -665,7 +689,7 @@ retry:
 	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
 	if (error)
 		return error;
-	error = getxattr(path.dentry, name, value, size);
+	error = getxattr(mnt_user_ns(path.mnt), path.dentry, name, value, size);
 	path_put(&path);
 	if (retry_estale(error, lookup_flags)) {
 		lookup_flags |= LOOKUP_REVAL;
@@ -695,7 +719,8 @@ SYSCALL_DEFINE4(fgetxattr, int, fd, const char __user *, name,
 	if (!f.file)
 		return error;
 	audit_file(f.file);
-	error = getxattr(f.file->f_path.dentry, name, value, size);
+	error = getxattr(file_mnt_user_ns(f.file), f.file->f_path.dentry,
+			 name, value, size);
 	fdput(f);
 	return error;
 }
@@ -779,7 +804,8 @@ SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size)
  * Extended attribute REMOVE operations
  */
 static long
-removexattr(struct dentry *d, const char __user *name)
+removexattr(struct user_namespace *mnt_userns, struct dentry *d,
+	    const char __user *name)
 {
 	int error;
 	char kname[XATTR_NAME_MAX + 1];
@@ -790,7 +816,7 @@ removexattr(struct dentry *d, const char __user *name)
 	if (error < 0)
 		return error;
 
-	return vfs_removexattr(d, kname);
+	return vfs_removexattr(mnt_userns, d, kname);
 }
 
 static int path_removexattr(const char __user *pathname,
@@ -804,7 +830,7 @@ retry:
 		return error;
 	error = mnt_want_write(path.mnt);
 	if (!error) {
-		error = removexattr(path.dentry, name);
+		error = removexattr(mnt_user_ns(path.mnt), path.dentry, name);
 		mnt_drop_write(path.mnt);
 	}
 	path_put(&path);
@@ -837,7 +863,8 @@ SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
 	audit_file(f.file);
 	error = mnt_want_write_file(f.file);
 	if (!error) {
-		error = removexattr(f.file->f_path.dentry, name);
+		error = removexattr(file_mnt_user_ns(f.file),
+				    f.file->f_path.dentry, name);
 		mnt_drop_write_file(f.file);
 	}
 	fdput(f);
diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
index 779cb73b3d00..d02bef24b32b 100644
--- a/fs/xfs/xfs_acl.c
+++ b/fs/xfs/xfs_acl.c
@@ -238,7 +238,8 @@ xfs_acl_set_mode(
 }
 
 int
-xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+xfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+	    struct posix_acl *acl, int type)
 {
 	umode_t mode;
 	bool set_mode = false;
@@ -252,7 +253,7 @@ xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 		return error;
 
 	if (type == ACL_TYPE_ACCESS) {
-		error = posix_acl_update_mode(inode, &mode, &acl);
+		error = posix_acl_update_mode(mnt_userns, inode, &mode, &acl);
 		if (error)
 			return error;
 		set_mode = true;
diff --git a/fs/xfs/xfs_acl.h b/fs/xfs/xfs_acl.h
index c042c0868016..7bdb3a4ed798 100644
--- a/fs/xfs/xfs_acl.h
+++ b/fs/xfs/xfs_acl.h
@@ -11,7 +11,8 @@ struct posix_acl;
 
 #ifdef CONFIG_XFS_POSIX_ACL
 extern struct posix_acl *xfs_get_acl(struct inode *inode, int type);
-extern int xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
+extern int xfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+		       struct posix_acl *acl, int type);
 extern int __xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
 void xfs_forget_acl(struct inode *inode, const char *name);
 #else
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 68ca1b40d8c7..a007ca0711d9 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -29,6 +29,7 @@
 #include <linux/backing-dev.h>
 #include <linux/mman.h>
 #include <linux/fadvise.h>
+#include <linux/mount.h>
 
 static const struct vm_operations_struct xfs_file_vm_ops;
 
@@ -1051,7 +1052,8 @@ xfs_file_fallocate(
 
 		iattr.ia_valid = ATTR_SIZE;
 		iattr.ia_size = new_size;
-		error = xfs_vn_setattr_size(file_dentry(file), &iattr);
+		error = xfs_vn_setattr_size(file_mnt_user_ns(file),
+					    file_dentry(file), &iattr);
 		if (error)
 			goto out_unlock;
 	}
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 636ac13b1df2..46a861d55e48 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -766,6 +766,7 @@ xfs_inode_inherit_flags2(
  */
 static int
 xfs_init_new_inode(
+	struct user_namespace	*mnt_userns,
 	struct xfs_trans	*tp,
 	struct xfs_inode	*pip,
 	xfs_ino_t		ino,
@@ -811,11 +812,11 @@ xfs_init_new_inode(
 
 	if (dir && !(dir->i_mode & S_ISGID) &&
 	    (mp->m_flags & XFS_MOUNT_GRPID)) {
-		inode->i_uid = current_fsuid();
+		inode->i_uid = fsuid_into_mnt(mnt_userns);
 		inode->i_gid = dir->i_gid;
 		inode->i_mode = mode;
 	} else {
-		inode_init_owner(inode, dir, mode);
+		inode_init_owner(mnt_userns, inode, dir, mode);
 	}
 
 	/*
@@ -824,7 +825,8 @@ xfs_init_new_inode(
 	 * (and only if the irix_sgid_inherit compatibility variable is set).
 	 */
 	if (irix_sgid_inherit &&
-	    (inode->i_mode & S_ISGID) && !in_group_p(inode->i_gid))
+	    (inode->i_mode & S_ISGID) &&
+	    !in_group_p(i_gid_into_mnt(mnt_userns, inode)))
 		inode->i_mode &= ~S_ISGID;
 
 	ip->i_d.di_size = 0;
@@ -901,6 +903,7 @@ xfs_init_new_inode(
  */
 int
 xfs_dir_ialloc(
+	struct user_namespace	*mnt_userns,
 	struct xfs_trans	**tpp,
 	struct xfs_inode	*dp,
 	umode_t			mode,
@@ -933,7 +936,8 @@ xfs_dir_ialloc(
 		return error;
 	ASSERT(ino != NULLFSINO);
 
-	return xfs_init_new_inode(*tpp, dp, ino, mode, nlink, rdev, prid, ipp);
+	return xfs_init_new_inode(mnt_userns, *tpp, dp, ino, mode, nlink, rdev,
+				  prid, ipp);
 }
 
 /*
@@ -973,6 +977,7 @@ xfs_bumplink(
 
 int
 xfs_create(
+	struct user_namespace	*mnt_userns,
 	xfs_inode_t		*dp,
 	struct xfs_name		*name,
 	umode_t			mode,
@@ -1046,7 +1051,8 @@ xfs_create(
 	 * entry pointing to them, but a directory also the "." entry
 	 * pointing to itself.
 	 */
-	error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev, prid, &ip);
+	error = xfs_dir_ialloc(mnt_userns, &tp, dp, mode, is_dir ? 2 : 1, rdev,
+			       prid, &ip);
 	if (error)
 		goto out_trans_cancel;
 
@@ -1127,6 +1133,7 @@ xfs_create(
 
 int
 xfs_create_tmpfile(
+	struct user_namespace	*mnt_userns,
 	struct xfs_inode	*dp,
 	umode_t			mode,
 	struct xfs_inode	**ipp)
@@ -1164,7 +1171,7 @@ xfs_create_tmpfile(
 	if (error)
 		goto out_release_dquots;
 
-	error = xfs_dir_ialloc(&tp, dp, mode, 0, 0, prid, &ip);
+	error = xfs_dir_ialloc(mnt_userns, &tp, dp, mode, 0, 0, prid, &ip);
 	if (error)
 		goto out_trans_cancel;
 
@@ -2977,13 +2984,15 @@ out_trans_abort:
  */
 static int
 xfs_rename_alloc_whiteout(
+	struct user_namespace	*mnt_userns,
 	struct xfs_inode	*dp,
 	struct xfs_inode	**wip)
 {
 	struct xfs_inode	*tmpfile;
 	int			error;
 
-	error = xfs_create_tmpfile(dp, S_IFCHR | WHITEOUT_MODE, &tmpfile);
+	error = xfs_create_tmpfile(mnt_userns, dp, S_IFCHR | WHITEOUT_MODE,
+				   &tmpfile);
 	if (error)
 		return error;
 
@@ -3005,6 +3014,7 @@ xfs_rename_alloc_whiteout(
  */
 int
 xfs_rename(
+	struct user_namespace	*mnt_userns,
 	struct xfs_inode	*src_dp,
 	struct xfs_name		*src_name,
 	struct xfs_inode	*src_ip,
@@ -3036,7 +3046,7 @@ xfs_rename(
 	 */
 	if (flags & RENAME_WHITEOUT) {
 		ASSERT(!(flags & (RENAME_NOREPLACE | RENAME_EXCHANGE)));
-		error = xfs_rename_alloc_whiteout(target_dp, &wip);
+		error = xfs_rename_alloc_whiteout(mnt_userns, target_dp, &wip);
 		if (error)
 			return error;
 
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index eca333f5f715..88ee4c3930ae 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -369,15 +369,18 @@ int		xfs_release(struct xfs_inode *ip);
 void		xfs_inactive(struct xfs_inode *ip);
 int		xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
 			   struct xfs_inode **ipp, struct xfs_name *ci_name);
-int		xfs_create(struct xfs_inode *dp, struct xfs_name *name,
+int		xfs_create(struct user_namespace *mnt_userns,
+			   struct xfs_inode *dp, struct xfs_name *name,
 			   umode_t mode, dev_t rdev, struct xfs_inode **ipp);
-int		xfs_create_tmpfile(struct xfs_inode *dp, umode_t mode,
+int		xfs_create_tmpfile(struct user_namespace *mnt_userns,
+			   struct xfs_inode *dp, umode_t mode,
 			   struct xfs_inode **ipp);
 int		xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
 			   struct xfs_inode *ip);
 int		xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
 			 struct xfs_name *target_name);
-int		xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
+int		xfs_rename(struct user_namespace *mnt_userns,
+			   struct xfs_inode *src_dp, struct xfs_name *src_name,
 			   struct xfs_inode *src_ip, struct xfs_inode *target_dp,
 			   struct xfs_name *target_name,
 			   struct xfs_inode *target_ip, unsigned int flags);
@@ -407,9 +410,10 @@ void		xfs_lock_two_inodes(struct xfs_inode *ip0, uint ip0_mode,
 xfs_extlen_t	xfs_get_extsz_hint(struct xfs_inode *ip);
 xfs_extlen_t	xfs_get_cowextsz_hint(struct xfs_inode *ip);
 
-int xfs_dir_ialloc(struct xfs_trans **tpp, struct xfs_inode *dp, umode_t mode,
-		   xfs_nlink_t nlink, dev_t dev, prid_t prid,
-		   struct xfs_inode **ipp);
+int		xfs_dir_ialloc(struct user_namespace *mnt_userns,
+			       struct xfs_trans **tpp, struct xfs_inode *dp,
+			       umode_t mode, xfs_nlink_t nlink, dev_t dev,
+			       prid_t prid, struct xfs_inode **ipp);
 
 static inline int
 xfs_itruncate_extents(
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 248083ea0276..99dfe89a8d08 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -693,7 +693,8 @@ xfs_ioc_space(
 
 	iattr.ia_valid = ATTR_SIZE;
 	iattr.ia_size = bf->l_start;
-	error = xfs_vn_setattr_size(file_dentry(filp), &iattr);
+	error = xfs_vn_setattr_size(file_mnt_user_ns(filp), file_dentry(filp),
+				    &iattr);
 	if (error)
 		goto out_unlock;
 
@@ -734,13 +735,15 @@ xfs_fsinumbers_fmt(
 
 STATIC int
 xfs_ioc_fsbulkstat(
-	xfs_mount_t		*mp,
+	struct file		*file,
 	unsigned int		cmd,
 	void			__user *arg)
 {
+	struct xfs_mount	*mp = XFS_I(file_inode(file))->i_mount;
 	struct xfs_fsop_bulkreq	bulkreq;
 	struct xfs_ibulk	breq = {
 		.mp		= mp,
+		.mnt_userns	= file_mnt_user_ns(file),
 		.ocount		= 0,
 	};
 	xfs_ino_t		lastino;
@@ -908,13 +911,15 @@ xfs_bulk_ireq_teardown(
 /* Handle the v5 bulkstat ioctl. */
 STATIC int
 xfs_ioc_bulkstat(
-	struct xfs_mount		*mp,
+	struct file			*file,
 	unsigned int			cmd,
 	struct xfs_bulkstat_req __user	*arg)
 {
+	struct xfs_mount		*mp = XFS_I(file_inode(file))->i_mount;
 	struct xfs_bulk_ireq		hdr;
 	struct xfs_ibulk		breq = {
 		.mp			= mp,
+		.mnt_userns		= file_mnt_user_ns(file),
 	};
 	int				error;
 
@@ -1275,9 +1280,10 @@ xfs_ioctl_setattr_prepare_dax(
  */
 static struct xfs_trans *
 xfs_ioctl_setattr_get_trans(
-	struct xfs_inode	*ip,
+	struct file		*file,
 	struct xfs_dquot	*pdqp)
 {
+	struct xfs_inode	*ip = XFS_I(file_inode(file));
 	struct xfs_mount	*mp = ip->i_mount;
 	struct xfs_trans	*tp;
 	int			error = -EROFS;
@@ -1299,7 +1305,7 @@ xfs_ioctl_setattr_get_trans(
 	 * The user ID of the calling process must be equal to the file owner
 	 * ID, except in cases where the CAP_FSETID capability is applicable.
 	 */
-	if (!inode_owner_or_capable(VFS_I(ip))) {
+	if (!inode_owner_or_capable(file_mnt_user_ns(file), VFS_I(ip))) {
 		error = -EPERM;
 		goto out_cancel;
 	}
@@ -1427,9 +1433,11 @@ xfs_ioctl_setattr_check_projid(
 
 STATIC int
 xfs_ioctl_setattr(
-	xfs_inode_t		*ip,
+	struct file		*file,
 	struct fsxattr		*fa)
 {
+	struct user_namespace	*mnt_userns = file_mnt_user_ns(file);
+	struct xfs_inode	*ip = XFS_I(file_inode(file));
 	struct fsxattr		old_fa;
 	struct xfs_mount	*mp = ip->i_mount;
 	struct xfs_trans	*tp;
@@ -1461,7 +1469,7 @@ xfs_ioctl_setattr(
 
 	xfs_ioctl_setattr_prepare_dax(ip, fa);
 
-	tp = xfs_ioctl_setattr_get_trans(ip, pdqp);
+	tp = xfs_ioctl_setattr_get_trans(file, pdqp);
 	if (IS_ERR(tp)) {
 		error = PTR_ERR(tp);
 		goto error_free_dquots;
@@ -1493,7 +1501,7 @@ xfs_ioctl_setattr(
 	 */
 
 	if ((VFS_I(ip)->i_mode & (S_ISUID|S_ISGID)) &&
-	    !capable_wrt_inode_uidgid(VFS_I(ip), CAP_FSETID))
+	    !capable_wrt_inode_uidgid(mnt_userns, VFS_I(ip), CAP_FSETID))
 		VFS_I(ip)->i_mode &= ~(S_ISUID|S_ISGID);
 
 	/* Change the ownerships and register project quota modifications */
@@ -1540,7 +1548,6 @@ error_free_dquots:
 
 STATIC int
 xfs_ioc_fssetxattr(
-	xfs_inode_t		*ip,
 	struct file		*filp,
 	void			__user *arg)
 {
@@ -1553,7 +1560,7 @@ xfs_ioc_fssetxattr(
 	error = mnt_want_write_file(filp);
 	if (error)
 		return error;
-	error = xfs_ioctl_setattr(ip, &fa);
+	error = xfs_ioctl_setattr(filp, &fa);
 	mnt_drop_write_file(filp);
 	return error;
 }
@@ -1599,7 +1606,7 @@ xfs_ioc_setxflags(
 
 	xfs_ioctl_setattr_prepare_dax(ip, &fa);
 
-	tp = xfs_ioctl_setattr_get_trans(ip, NULL);
+	tp = xfs_ioctl_setattr_get_trans(filp, NULL);
 	if (IS_ERR(tp)) {
 		error = PTR_ERR(tp);
 		goto out_drop_write;
@@ -2110,10 +2117,10 @@ xfs_file_ioctl(
 	case XFS_IOC_FSBULKSTAT_SINGLE:
 	case XFS_IOC_FSBULKSTAT:
 	case XFS_IOC_FSINUMBERS:
-		return xfs_ioc_fsbulkstat(mp, cmd, arg);
+		return xfs_ioc_fsbulkstat(filp, cmd, arg);
 
 	case XFS_IOC_BULKSTAT:
-		return xfs_ioc_bulkstat(mp, cmd, arg);
+		return xfs_ioc_bulkstat(filp, cmd, arg);
 	case XFS_IOC_INUMBERS:
 		return xfs_ioc_inumbers(mp, cmd, arg);
 
@@ -2135,7 +2142,7 @@ xfs_file_ioctl(
 	case XFS_IOC_FSGETXATTRA:
 		return xfs_ioc_fsgetxattr(ip, 1, arg);
 	case XFS_IOC_FSSETXATTR:
-		return xfs_ioc_fssetxattr(ip, filp, arg);
+		return xfs_ioc_fssetxattr(filp, arg);
 	case XFS_IOC_GETXFLAGS:
 		return xfs_ioc_getxflags(ip, arg);
 	case XFS_IOC_SETXFLAGS:
diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
index c1771e728117..33c09ec8e6c0 100644
--- a/fs/xfs/xfs_ioctl32.c
+++ b/fs/xfs/xfs_ioctl32.c
@@ -209,14 +209,16 @@ xfs_fsbulkstat_one_fmt_compat(
 /* copied from xfs_ioctl.c */
 STATIC int
 xfs_compat_ioc_fsbulkstat(
-	xfs_mount_t		  *mp,
+	struct file		*file,
 	unsigned int		  cmd,
 	struct compat_xfs_fsop_bulkreq __user *p32)
 {
+	struct xfs_mount	*mp = XFS_I(file_inode(file))->i_mount;
 	u32			addr;
 	struct xfs_fsop_bulkreq	bulkreq;
 	struct xfs_ibulk	breq = {
 		.mp		= mp,
+		.mnt_userns	= file_mnt_user_ns(file),
 		.ocount		= 0,
 	};
 	xfs_ino_t		lastino;
@@ -436,7 +438,6 @@ xfs_file_compat_ioctl(
 {
 	struct inode		*inode = file_inode(filp);
 	struct xfs_inode	*ip = XFS_I(inode);
-	struct xfs_mount	*mp = ip->i_mount;
 	void			__user *arg = compat_ptr(p);
 	int			error;
 
@@ -456,7 +457,7 @@ xfs_file_compat_ioctl(
 		return xfs_ioc_space(filp, &bf);
 	}
 	case XFS_IOC_FSGEOMETRY_V1_32:
-		return xfs_compat_ioc_fsgeometry_v1(mp, arg);
+		return xfs_compat_ioc_fsgeometry_v1(ip->i_mount, arg);
 	case XFS_IOC_FSGROWFSDATA_32: {
 		struct xfs_growfs_data	in;
 
@@ -465,7 +466,7 @@ xfs_file_compat_ioctl(
 		error = mnt_want_write_file(filp);
 		if (error)
 			return error;
-		error = xfs_growfs_data(mp, &in);
+		error = xfs_growfs_data(ip->i_mount, &in);
 		mnt_drop_write_file(filp);
 		return error;
 	}
@@ -477,7 +478,7 @@ xfs_file_compat_ioctl(
 		error = mnt_want_write_file(filp);
 		if (error)
 			return error;
-		error = xfs_growfs_rt(mp, &in);
+		error = xfs_growfs_rt(ip->i_mount, &in);
 		mnt_drop_write_file(filp);
 		return error;
 	}
@@ -507,7 +508,7 @@ xfs_file_compat_ioctl(
 	case XFS_IOC_FSBULKSTAT_32:
 	case XFS_IOC_FSBULKSTAT_SINGLE_32:
 	case XFS_IOC_FSINUMBERS_32:
-		return xfs_compat_ioc_fsbulkstat(mp, cmd, arg);
+		return xfs_compat_ioc_fsbulkstat(filp, cmd, arg);
 	case XFS_IOC_FD_TO_HANDLE_32:
 	case XFS_IOC_PATH_TO_HANDLE_32:
 	case XFS_IOC_PATH_TO_FSHANDLE_32: {
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 00369502fe25..66ebccb5a6ff 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -128,6 +128,7 @@ xfs_cleanup_inode(
 
 STATIC int
 xfs_generic_create(
+	struct user_namespace	*mnt_userns,
 	struct inode	*dir,
 	struct dentry	*dentry,
 	umode_t		mode,
@@ -161,9 +162,10 @@ xfs_generic_create(
 		goto out_free_acl;
 
 	if (!tmpfile) {
-		error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
+		error = xfs_create(mnt_userns, XFS_I(dir), &name, mode, rdev,
+				   &ip);
 	} else {
-		error = xfs_create_tmpfile(XFS_I(dir), mode, &ip);
+		error = xfs_create_tmpfile(mnt_userns, XFS_I(dir), mode, &ip);
 	}
 	if (unlikely(error))
 		goto out_free_acl;
@@ -220,31 +222,35 @@ xfs_generic_create(
 
 STATIC int
 xfs_vn_mknod(
-	struct inode	*dir,
-	struct dentry	*dentry,
-	umode_t		mode,
-	dev_t		rdev)
+	struct user_namespace	*mnt_userns,
+	struct inode		*dir,
+	struct dentry		*dentry,
+	umode_t			mode,
+	dev_t			rdev)
 {
-	return xfs_generic_create(dir, dentry, mode, rdev, false);
+	return xfs_generic_create(mnt_userns, dir, dentry, mode, rdev, false);
 }
 
 STATIC int
 xfs_vn_create(
-	struct inode	*dir,
-	struct dentry	*dentry,
-	umode_t		mode,
-	bool		flags)
+	struct user_namespace	*mnt_userns,
+	struct inode		*dir,
+	struct dentry		*dentry,
+	umode_t			mode,
+	bool			flags)
 {
-	return xfs_generic_create(dir, dentry, mode, 0, false);
+	return xfs_generic_create(mnt_userns, dir, dentry, mode, 0, false);
 }
 
 STATIC int
 xfs_vn_mkdir(
-	struct inode	*dir,
-	struct dentry	*dentry,
-	umode_t		mode)
+	struct user_namespace	*mnt_userns,
+	struct inode		*dir,
+	struct dentry		*dentry,
+	umode_t			mode)
 {
-	return xfs_generic_create(dir, dentry, mode | S_IFDIR, 0, false);
+	return xfs_generic_create(mnt_userns, dir, dentry, mode | S_IFDIR, 0,
+				  false);
 }
 
 STATIC struct dentry *
@@ -361,9 +367,10 @@ xfs_vn_unlink(
 
 STATIC int
 xfs_vn_symlink(
-	struct inode	*dir,
-	struct dentry	*dentry,
-	const char	*symname)
+	struct user_namespace	*mnt_userns,
+	struct inode		*dir,
+	struct dentry		*dentry,
+	const char		*symname)
 {
 	struct inode	*inode;
 	struct xfs_inode *cip = NULL;
@@ -377,7 +384,7 @@ xfs_vn_symlink(
 	if (unlikely(error))
 		goto out;
 
-	error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
+	error = xfs_symlink(mnt_userns, XFS_I(dir), &name, symname, mode, &cip);
 	if (unlikely(error))
 		goto out;
 
@@ -403,11 +410,12 @@ xfs_vn_symlink(
 
 STATIC int
 xfs_vn_rename(
-	struct inode	*odir,
-	struct dentry	*odentry,
-	struct inode	*ndir,
-	struct dentry	*ndentry,
-	unsigned int	flags)
+	struct user_namespace	*mnt_userns,
+	struct inode		*odir,
+	struct dentry		*odentry,
+	struct inode		*ndir,
+	struct dentry		*ndentry,
+	unsigned int		flags)
 {
 	struct inode	*new_inode = d_inode(ndentry);
 	int		omode = 0;
@@ -431,8 +439,8 @@ xfs_vn_rename(
 	if (unlikely(error))
 		return error;
 
-	return xfs_rename(XFS_I(odir), &oname, XFS_I(d_inode(odentry)),
-			  XFS_I(ndir), &nname,
+	return xfs_rename(mnt_userns, XFS_I(odir), &oname,
+			  XFS_I(d_inode(odentry)), XFS_I(ndir), &nname,
 			  new_inode ? XFS_I(new_inode) : NULL, flags);
 }
 
@@ -529,6 +537,7 @@ xfs_stat_blksize(
 
 STATIC int
 xfs_vn_getattr(
+	struct user_namespace	*mnt_userns,
 	const struct path	*path,
 	struct kstat		*stat,
 	u32			request_mask,
@@ -547,8 +556,8 @@ xfs_vn_getattr(
 	stat->dev = inode->i_sb->s_dev;
 	stat->mode = inode->i_mode;
 	stat->nlink = inode->i_nlink;
-	stat->uid = inode->i_uid;
-	stat->gid = inode->i_gid;
+	stat->uid = i_uid_into_mnt(mnt_userns, inode);
+	stat->gid = i_gid_into_mnt(mnt_userns, inode);
 	stat->ino = ip->i_ino;
 	stat->atime = inode->i_atime;
 	stat->mtime = inode->i_mtime;
@@ -626,8 +635,9 @@ xfs_setattr_time(
 
 static int
 xfs_vn_change_ok(
-	struct dentry	*dentry,
-	struct iattr	*iattr)
+	struct user_namespace	*mnt_userns,
+	struct dentry		*dentry,
+	struct iattr		*iattr)
 {
 	struct xfs_mount	*mp = XFS_I(d_inode(dentry))->i_mount;
 
@@ -637,7 +647,7 @@ xfs_vn_change_ok(
 	if (XFS_FORCED_SHUTDOWN(mp))
 		return -EIO;
 
-	return setattr_prepare(dentry, iattr);
+	return setattr_prepare(mnt_userns, dentry, iattr);
 }
 
 /*
@@ -648,6 +658,7 @@ xfs_vn_change_ok(
  */
 static int
 xfs_setattr_nonsize(
+	struct user_namespace	*mnt_userns,
 	struct xfs_inode	*ip,
 	struct iattr		*iattr)
 {
@@ -788,7 +799,7 @@ xfs_setattr_nonsize(
 	 * 	     Posix ACL code seems to care about this issue either.
 	 */
 	if (mask & ATTR_MODE) {
-		error = posix_acl_chmod(inode, inode->i_mode);
+		error = posix_acl_chmod(mnt_userns, inode, inode->i_mode);
 		if (error)
 			return error;
 	}
@@ -809,6 +820,7 @@ out_dqrele:
  */
 STATIC int
 xfs_setattr_size(
+	struct user_namespace	*mnt_userns,
 	struct xfs_inode	*ip,
 	struct iattr		*iattr)
 {
@@ -840,7 +852,7 @@ xfs_setattr_size(
 		 * Use the regular setattr path to update the timestamps.
 		 */
 		iattr->ia_valid &= ~ATTR_SIZE;
-		return xfs_setattr_nonsize(ip, iattr);
+		return xfs_setattr_nonsize(mnt_userns, ip, iattr);
 	}
 
 	/*
@@ -1009,6 +1021,7 @@ out_trans_cancel:
 
 int
 xfs_vn_setattr_size(
+	struct user_namespace	*mnt_userns,
 	struct dentry		*dentry,
 	struct iattr		*iattr)
 {
@@ -1017,14 +1030,15 @@ xfs_vn_setattr_size(
 
 	trace_xfs_setattr(ip);
 
-	error = xfs_vn_change_ok(dentry, iattr);
+	error = xfs_vn_change_ok(mnt_userns, dentry, iattr);
 	if (error)
 		return error;
-	return xfs_setattr_size(ip, iattr);
+	return xfs_setattr_size(mnt_userns, ip, iattr);
 }
 
 STATIC int
 xfs_vn_setattr(
+	struct user_namespace	*mnt_userns,
 	struct dentry		*dentry,
 	struct iattr		*iattr)
 {
@@ -1044,14 +1058,14 @@ xfs_vn_setattr(
 			return error;
 		}
 
-		error = xfs_vn_setattr_size(dentry, iattr);
+		error = xfs_vn_setattr_size(mnt_userns, dentry, iattr);
 		xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
 	} else {
 		trace_xfs_setattr(ip);
 
-		error = xfs_vn_change_ok(dentry, iattr);
+		error = xfs_vn_change_ok(mnt_userns, dentry, iattr);
 		if (!error)
-			error = xfs_setattr_nonsize(ip, iattr);
+			error = xfs_setattr_nonsize(mnt_userns, ip, iattr);
 	}
 
 	return error;
@@ -1122,11 +1136,12 @@ xfs_vn_fiemap(
 
 STATIC int
 xfs_vn_tmpfile(
-	struct inode	*dir,
-	struct dentry	*dentry,
-	umode_t		mode)
+	struct user_namespace	*mnt_userns,
+	struct inode		*dir,
+	struct dentry		*dentry,
+	umode_t			mode)
 {
-	return xfs_generic_create(dir, dentry, mode, 0, true);
+	return xfs_generic_create(mnt_userns, dir, dentry, mode, 0, true);
 }
 
 static const struct inode_operations xfs_inode_operations = {
diff --git a/fs/xfs/xfs_iops.h b/fs/xfs/xfs_iops.h
index 99ca745c1071..278949056048 100644
--- a/fs/xfs/xfs_iops.h
+++ b/fs/xfs/xfs_iops.h
@@ -14,6 +14,7 @@ extern const struct file_operations xfs_dir_file_operations;
 extern ssize_t xfs_vn_listxattr(struct dentry *, char *data, size_t size);
 
 extern void xfs_setattr_time(struct xfs_inode *ip, struct iattr *iattr);
-extern int xfs_vn_setattr_size(struct dentry *dentry, struct iattr *vap);
+int xfs_vn_setattr_size(struct user_namespace *mnt_userns,
+		struct dentry *dentry, struct iattr *vap);
 
 #endif /* __XFS_IOPS_H__ */
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index 16ca97a7ff00..ca310a125d1e 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -54,10 +54,12 @@ struct xfs_bstat_chunk {
 STATIC int
 xfs_bulkstat_one_int(
 	struct xfs_mount	*mp,
+	struct user_namespace	*mnt_userns,
 	struct xfs_trans	*tp,
 	xfs_ino_t		ino,
 	struct xfs_bstat_chunk	*bc)
 {
+	struct user_namespace	*sb_userns = mp->m_super->s_user_ns;
 	struct xfs_icdinode	*dic;		/* dinode core info pointer */
 	struct xfs_inode	*ip;		/* incore inode pointer */
 	struct inode		*inode;
@@ -86,8 +88,8 @@ xfs_bulkstat_one_int(
 	 */
 	buf->bs_projectid = ip->i_d.di_projid;
 	buf->bs_ino = ino;
-	buf->bs_uid = i_uid_read(inode);
-	buf->bs_gid = i_gid_read(inode);
+	buf->bs_uid = from_kuid(sb_userns, i_uid_into_mnt(mnt_userns, inode));
+	buf->bs_gid = from_kgid(sb_userns, i_gid_into_mnt(mnt_userns, inode));
 	buf->bs_size = dic->di_size;
 
 	buf->bs_nlink = inode->i_nlink;
@@ -173,7 +175,8 @@ xfs_bulkstat_one(
 	if (!bc.buf)
 		return -ENOMEM;
 
-	error = xfs_bulkstat_one_int(breq->mp, NULL, breq->startino, &bc);
+	error = xfs_bulkstat_one_int(breq->mp, breq->mnt_userns, NULL,
+				     breq->startino, &bc);
 
 	kmem_free(bc.buf);
 
@@ -194,9 +197,10 @@ xfs_bulkstat_iwalk(
 	xfs_ino_t		ino,
 	void			*data)
 {
+	struct xfs_bstat_chunk	*bc = data;
 	int			error;
 
-	error = xfs_bulkstat_one_int(mp, tp, ino, data);
+	error = xfs_bulkstat_one_int(mp, bc->breq->mnt_userns, tp, ino, data);
 	/* bulkstat just skips over missing inodes */
 	if (error == -ENOENT || error == -EINVAL)
 		return 0;
@@ -239,6 +243,11 @@ xfs_bulkstat(
 	};
 	int			error;
 
+	if (breq->mnt_userns != &init_user_ns) {
+		xfs_warn_ratelimited(breq->mp,
+			"bulkstat not supported inside of idmapped mounts.");
+		return -EINVAL;
+	}
 	if (xfs_bulkstat_already_done(breq->mp, breq->startino))
 		return 0;
 
diff --git a/fs/xfs/xfs_itable.h b/fs/xfs/xfs_itable.h
index 96a1e2a9be3f..7078d10c9b12 100644
--- a/fs/xfs/xfs_itable.h
+++ b/fs/xfs/xfs_itable.h
@@ -8,6 +8,7 @@
 /* In-memory representation of a userspace request for batch inode data. */
 struct xfs_ibulk {
 	struct xfs_mount	*mp;
+	struct user_namespace   *mnt_userns;
 	void __user		*ubuffer; /* user output buffer */
 	xfs_ino_t		startino; /* start with this inode */
 	unsigned int		icount;   /* number of elements in ubuffer */
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index 742d1413e2d0..bfa4164990b1 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -787,7 +787,8 @@ xfs_qm_qino_alloc(
 		return error;
 
 	if (need_alloc) {
-		error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, ipp);
+		error = xfs_dir_ialloc(&init_user_ns, &tp, NULL, S_IFREG, 1, 0,
+				       0, ipp);
 		if (error) {
 			xfs_trans_cancel(tp);
 			return error;
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 586d42342a79..e5e0713bebcd 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1881,7 +1881,7 @@ static struct file_system_type xfs_fs_type = {
 	.init_fs_context	= xfs_init_fs_context,
 	.parameters		= xfs_fs_parameters,
 	.kill_sb		= kill_block_super,
-	.fs_flags		= FS_REQUIRES_DEV,
+	.fs_flags		= FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
 };
 MODULE_ALIAS_FS("xfs");
 
diff --git a/fs/xfs/xfs_symlink.c b/fs/xfs/xfs_symlink.c
index 8565663b16cd..1379013d74b8 100644
--- a/fs/xfs/xfs_symlink.c
+++ b/fs/xfs/xfs_symlink.c
@@ -134,6 +134,7 @@ xfs_readlink(
 
 int
 xfs_symlink(
+	struct user_namespace	*mnt_userns,
 	struct xfs_inode	*dp,
 	struct xfs_name		*link_name,
 	const char		*target_path,
@@ -221,8 +222,8 @@ xfs_symlink(
 	/*
 	 * Allocate an inode for the symlink.
 	 */
-	error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
-			       prid, &ip);
+	error = xfs_dir_ialloc(mnt_userns, &tp, dp, S_IFLNK | (mode & ~S_IFMT),
+			       1, 0, prid, &ip);
 	if (error)
 		goto out_trans_cancel;
 
diff --git a/fs/xfs/xfs_symlink.h b/fs/xfs/xfs_symlink.h
index b1fa091427e6..2586b7e393f3 100644
--- a/fs/xfs/xfs_symlink.h
+++ b/fs/xfs/xfs_symlink.h
@@ -7,8 +7,9 @@
 
 /* Kernel only symlink definitions */
 
-int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name,
-		const char *target_path, umode_t mode, struct xfs_inode **ipp);
+int xfs_symlink(struct user_namespace *mnt_userns, struct xfs_inode *dp,
+		struct xfs_name *link_name, const char *target_path,
+		umode_t mode, struct xfs_inode **ipp);
 int xfs_readlink_bmap_ilocked(struct xfs_inode *ip, char *link);
 int xfs_readlink(struct xfs_inode *ip, char *link);
 int xfs_inactive_symlink(struct xfs_inode *ip);
diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
index bca48b308c02..12be32f66dc1 100644
--- a/fs/xfs/xfs_xattr.c
+++ b/fs/xfs/xfs_xattr.c
@@ -38,9 +38,10 @@ xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused,
 }
 
 static int
-xfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused,
-		struct inode *inode, const char *name, const void *value,
-		size_t size, int flags)
+xfs_xattr_set(const struct xattr_handler *handler,
+	      struct user_namespace *mnt_userns, struct dentry *unused,
+	      struct inode *inode, const char *name, const void *value,
+	      size_t size, int flags)
 {
 	struct xfs_da_args	args = {
 		.dp		= XFS_I(inode),
diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
index f3115432b43a..b6ff4a21abac 100644
--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -489,7 +489,8 @@ unlock:
 	return ret;
 }
 
-static int zonefs_inode_setattr(struct dentry *dentry, struct iattr *iattr)
+static int zonefs_inode_setattr(struct user_namespace *mnt_userns,
+				struct dentry *dentry, struct iattr *iattr)
 {
 	struct inode *inode = d_inode(dentry);
 	int ret;
@@ -497,7 +498,7 @@ static int zonefs_inode_setattr(struct dentry *dentry, struct iattr *iattr)
 	if (unlikely(IS_IMMUTABLE(inode)))
 		return -EPERM;
 
-	ret = setattr_prepare(dentry, iattr);
+	ret = setattr_prepare(&init_user_ns, dentry, iattr);
 	if (ret)
 		return ret;
 
@@ -525,7 +526,7 @@ static int zonefs_inode_setattr(struct dentry *dentry, struct iattr *iattr)
 			return ret;
 	}
 
-	setattr_copy(inode, iattr);
+	setattr_copy(&init_user_ns, inode, iattr);
 
 	return 0;
 }
@@ -1233,7 +1234,7 @@ static void zonefs_init_dir_inode(struct inode *parent, struct inode *inode,
 	struct super_block *sb = parent->i_sb;
 
 	inode->i_ino = blkdev_nr_zones(sb->s_bdev->bd_disk) + type + 1;
-	inode_init_owner(inode, parent, S_IFDIR | 0555);
+	inode_init_owner(&init_user_ns, inode, parent, S_IFDIR | 0555);
 	inode->i_op = &zonefs_dir_inode_operations;
 	inode->i_fop = &simple_dir_operations;
 	set_nlink(inode, 2);