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Diffstat (limited to 'fs/overlayfs/dir.c')
-rw-r--r--fs/overlayfs/dir.c88
1 files changed, 47 insertions, 41 deletions
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 6515796460df..a63a71656e9b 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -41,7 +41,7 @@ void ovl_cleanup(struct inode *wdir, struct dentry *wdentry)
}
}
-struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry)
+struct dentry *ovl_lookup_temp(struct dentry *workdir)
{
struct dentry *temp;
char name[20];
@@ -68,7 +68,7 @@ static struct dentry *ovl_whiteout(struct dentry *workdir,
struct dentry *whiteout;
struct inode *wdir = workdir->d_inode;
- whiteout = ovl_lookup_temp(workdir, dentry);
+ whiteout = ovl_lookup_temp(workdir);
if (IS_ERR(whiteout))
return whiteout;
@@ -127,45 +127,26 @@ int ovl_create_real(struct inode *dir, struct dentry *newdentry,
return err;
}
-static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry)
+static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper,
+ int xerr)
{
int err;
- err = ovl_do_setxattr(upperdentry, OVL_XATTR_OPAQUE, "y", 1, 0);
+ err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr);
if (!err)
ovl_dentry_set_opaque(dentry);
return err;
}
-static int ovl_dir_getattr(const struct path *path, struct kstat *stat,
- u32 request_mask, unsigned int flags)
+static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry)
{
- struct dentry *dentry = path->dentry;
- int err;
- enum ovl_path_type type;
- struct path realpath;
- const struct cred *old_cred;
-
- type = ovl_path_real(dentry, &realpath);
- old_cred = ovl_override_creds(dentry->d_sb);
- err = vfs_getattr(&realpath, stat, request_mask, flags);
- revert_creds(old_cred);
- if (err)
- return err;
-
- stat->dev = dentry->d_sb->s_dev;
- stat->ino = dentry->d_inode->i_ino;
-
/*
- * It's probably not worth it to count subdirs to get the
- * correct link count. nlink=1 seems to pacify 'find' and
- * other utilities.
+ * Fail with -EIO when trying to create opaque dir and upper doesn't
+ * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to
+ * return a specific error for noxattr case.
*/
- if (OVL_TYPE_MERGE(type))
- stat->nlink = 1;
-
- return 0;
+ return ovl_set_opaque_xerr(dentry, upperdentry, -EIO);
}
/* Common operations required to be done after creation of file on upper */
@@ -182,6 +163,9 @@ static void ovl_instantiate(struct dentry *dentry, struct inode *inode,
inc_nlink(inode);
}
d_instantiate(dentry, inode);
+ /* Force lookup of new upper hardlink to find its lower */
+ if (hardlink)
+ d_drop(dentry);
}
static bool ovl_type_merge(struct dentry *dentry)
@@ -189,6 +173,11 @@ static bool ovl_type_merge(struct dentry *dentry)
return OVL_TYPE_MERGE(ovl_path_type(dentry));
}
+static bool ovl_type_origin(struct dentry *dentry)
+{
+ return OVL_TYPE_ORIGIN(ovl_path_type(dentry));
+}
+
static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
struct cattr *attr, struct dentry *hardlink)
{
@@ -210,7 +199,7 @@ static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
if (err)
goto out_dput;
- if (ovl_type_merge(dentry->d_parent)) {
+ if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) {
/* Setting opaque here is just an optimization, allow to fail */
ovl_set_opaque(dentry, newdentry);
}
@@ -277,7 +266,7 @@ static struct dentry *ovl_clear_empty(struct dentry *dentry,
if (upper->d_parent->d_inode != udir)
goto out_unlock;
- opaquedir = ovl_lookup_temp(workdir, dentry);
+ opaquedir = ovl_lookup_temp(workdir);
err = PTR_ERR(opaquedir);
if (IS_ERR(opaquedir))
goto out_unlock;
@@ -409,7 +398,7 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
if (err)
goto out;
- newdentry = ovl_lookup_temp(workdir, dentry);
+ newdentry = ovl_lookup_temp(workdir);
err = PTR_ERR(newdentry);
if (IS_ERR(newdentry))
goto out_unlock;
@@ -873,18 +862,16 @@ static int ovl_set_redirect(struct dentry *dentry, bool samedir)
if (IS_ERR(redirect))
return PTR_ERR(redirect);
- err = ovl_do_setxattr(ovl_dentry_upper(dentry), OVL_XATTR_REDIRECT,
- redirect, strlen(redirect), 0);
+ err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry),
+ OVL_XATTR_REDIRECT,
+ redirect, strlen(redirect), -EXDEV);
if (!err) {
spin_lock(&dentry->d_lock);
ovl_dentry_set_redirect(dentry, redirect);
spin_unlock(&dentry->d_lock);
} else {
kfree(redirect);
- if (err == -EOPNOTSUPP)
- ovl_clear_redirect_dir(dentry->d_sb);
- else
- pr_warn_ratelimited("overlay: failed to set redirect (%i)\n", err);
+ pr_warn_ratelimited("overlay: failed to set redirect (%i)\n", err);
/* Fall back to userspace copy-up */
err = -EXDEV;
}
@@ -970,6 +957,25 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
old_upperdir = ovl_dentry_upper(old->d_parent);
new_upperdir = ovl_dentry_upper(new->d_parent);
+ if (!samedir) {
+ /*
+ * When moving a merge dir or non-dir with copy up origin into
+ * a new parent, we are marking the new parent dir "impure".
+ * When ovl_iterate() iterates an "impure" upper dir, it will
+ * lookup the origin inodes of the entries to fill d_ino.
+ */
+ if (ovl_type_origin(old)) {
+ err = ovl_set_impure(new->d_parent, new_upperdir);
+ if (err)
+ goto out_revert_creds;
+ }
+ if (!overwrite && ovl_type_origin(new)) {
+ err = ovl_set_impure(old->d_parent, old_upperdir);
+ if (err)
+ goto out_revert_creds;
+ }
+ }
+
trap = lock_rename(new_upperdir, old_upperdir);
olddentry = lookup_one_len(old->d_name.name, old_upperdir,
@@ -1019,7 +1025,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
if (ovl_type_merge_or_lower(old))
err = ovl_set_redirect(old, samedir);
else if (!old_opaque && ovl_type_merge(new->d_parent))
- err = ovl_set_opaque(old, olddentry);
+ err = ovl_set_opaque_xerr(old, olddentry, -EXDEV);
if (err)
goto out_dput;
}
@@ -1027,7 +1033,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
if (ovl_type_merge_or_lower(new))
err = ovl_set_redirect(new, samedir);
else if (!new_opaque && ovl_type_merge(old->d_parent))
- err = ovl_set_opaque(new, newdentry);
+ err = ovl_set_opaque_xerr(new, newdentry, -EXDEV);
if (err)
goto out_dput;
}
@@ -1070,7 +1076,7 @@ const struct inode_operations ovl_dir_inode_operations = {
.create = ovl_create,
.mknod = ovl_mknod,
.permission = ovl_permission,
- .getattr = ovl_dir_getattr,
+ .getattr = ovl_getattr,
.listxattr = ovl_listxattr,
.get_acl = ovl_get_acl,
.update_time = ovl_update_time,
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-18 15:15:27 +0300