diff options
author | Amir Goldstein <amir73il@gmail.com> | 2022-04-04 13:51:47 +0300 |
---|---|---|
committer | Miklos Szeredi <mszeredi@redhat.com> | 2022-04-28 17:31:11 +0300 |
commit | 1248ea4b91bcdafefdb025087e67d58382cfc9eb (patch) | |
tree | b2cdefa0cfc7da672d6e39ce956bea16f0efd8ec | |
parent | 5272eaf3a5682750f6f26ec542b206f0821fb3cb (diff) | |
download | linux-1248ea4b91bcdafefdb025087e67d58382cfc9eb.tar.xz |
ovl: pass layer mnt to ovl_open_realfile()
Ensure that ovl_open_realfile() takes the mount's idmapping into
account. We add a new helper ovl_path_realdata() that can be used to
easily retrieve the relevant path which we can pass down. This is needed
to support idmapped base layers with overlay.
Cc: <linux-unionfs@vger.kernel.org>
Tested-by: Giuseppe Scrivano <gscrivan@redhat.com>
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
-rw-r--r-- | fs/overlayfs/file.c | 22 | ||||
-rw-r--r-- | fs/overlayfs/overlayfs.h | 1 | ||||
-rw-r--r-- | fs/overlayfs/util.c | 14 |
3 files changed, 28 insertions, 9 deletions
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c index fa125feed0ff..9250e04e97af 100644 --- a/fs/overlayfs/file.c +++ b/fs/overlayfs/file.c @@ -38,8 +38,9 @@ static char ovl_whatisit(struct inode *inode, struct inode *realinode) #define OVL_OPEN_FLAGS (O_NOATIME | FMODE_NONOTIFY) static struct file *ovl_open_realfile(const struct file *file, - struct inode *realinode) + struct path *realpath) { + struct inode *realinode = d_inode(realpath->dentry); struct inode *inode = file_inode(file); struct file *realfile; const struct cred *old_cred; @@ -104,21 +105,21 @@ static int ovl_change_flags(struct file *file, unsigned int flags) static int ovl_real_fdget_meta(const struct file *file, struct fd *real, bool allow_meta) { - struct inode *inode = file_inode(file); - struct inode *realinode; + struct dentry *dentry = file_dentry(file); + struct path realpath; real->flags = 0; real->file = file->private_data; if (allow_meta) - realinode = ovl_inode_real(inode); + ovl_path_real(dentry, &realpath); else - realinode = ovl_inode_realdata(inode); + ovl_path_realdata(dentry, &realpath); /* Has it been copied up since we'd opened it? */ - if (unlikely(file_inode(real->file) != realinode)) { + if (unlikely(file_inode(real->file) != d_inode(realpath.dentry))) { real->flags = FDPUT_FPUT; - real->file = ovl_open_realfile(file, realinode); + real->file = ovl_open_realfile(file, &realpath); return PTR_ERR_OR_ZERO(real->file); } @@ -144,17 +145,20 @@ static int ovl_real_fdget(const struct file *file, struct fd *real) static int ovl_open(struct inode *inode, struct file *file) { + struct dentry *dentry = file_dentry(file); struct file *realfile; + struct path realpath; int err; - err = ovl_maybe_copy_up(file_dentry(file), file->f_flags); + err = ovl_maybe_copy_up(dentry, file->f_flags); if (err) return err; /* No longer need these flags, so don't pass them on to underlying fs */ file->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); - realfile = ovl_open_realfile(file, ovl_inode_realdata(inode)); + ovl_path_realdata(dentry, &realpath); + realfile = ovl_open_realfile(file, &realpath); if (IS_ERR(realfile)) return PTR_ERR(realfile); diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h index 40bf3d184bdb..d6405c2046ed 100644 --- a/fs/overlayfs/overlayfs.h +++ b/fs/overlayfs/overlayfs.h @@ -320,6 +320,7 @@ void ovl_path_upper(struct dentry *dentry, struct path *path); void ovl_path_lower(struct dentry *dentry, struct path *path); void ovl_path_lowerdata(struct dentry *dentry, struct path *path); enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); +enum ovl_path_type ovl_path_realdata(struct dentry *dentry, struct path *path); struct dentry *ovl_dentry_upper(struct dentry *dentry); struct dentry *ovl_dentry_lower(struct dentry *dentry); struct dentry *ovl_dentry_lowerdata(struct dentry *dentry); diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c index 5a7e5d1e884b..42293610f64e 100644 --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -194,6 +194,20 @@ enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path) return type; } +enum ovl_path_type ovl_path_realdata(struct dentry *dentry, struct path *path) +{ + enum ovl_path_type type = ovl_path_type(dentry); + + WARN_ON_ONCE(d_is_dir(dentry)); + + if (!OVL_TYPE_UPPER(type) || OVL_TYPE_MERGE(type)) + ovl_path_lowerdata(dentry, path); + else + ovl_path_upper(dentry, path); + + return type; +} + struct dentry *ovl_dentry_upper(struct dentry *dentry) { return ovl_upperdentry_dereference(OVL_I(d_inode(dentry))); |