diff options
Diffstat (limited to 'fs/overlayfs/dir.c')
| -rw-r--r-- | fs/overlayfs/dir.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c index 692ceda3b..52f6de5d4 100644 --- a/fs/overlayfs/dir.c +++ b/fs/overlayfs/dir.c @@ -167,7 +167,7 @@ static int ovl_create_upper(struct dentry *dentry, struct inode *inode, struct dentry *newdentry; int err; - mutex_lock_nested(&udir->i_mutex, I_MUTEX_PARENT); + inode_lock_nested(udir, I_MUTEX_PARENT); newdentry = lookup_one_len(dentry->d_name.name, upperdir, dentry->d_name.len); err = PTR_ERR(newdentry); @@ -185,7 +185,7 @@ static int ovl_create_upper(struct dentry *dentry, struct inode *inode, out_dput: dput(newdentry); out_unlock: - mutex_unlock(&udir->i_mutex); + inode_unlock(udir); return err; } @@ -258,9 +258,9 @@ static struct dentry *ovl_clear_empty(struct dentry *dentry, if (err) goto out_cleanup; - mutex_lock(&opaquedir->d_inode->i_mutex); + inode_lock(opaquedir->d_inode); err = ovl_set_attr(opaquedir, &stat); - mutex_unlock(&opaquedir->d_inode->i_mutex); + inode_unlock(opaquedir->d_inode); if (err) goto out_cleanup; @@ -599,7 +599,7 @@ static int ovl_remove_upper(struct dentry *dentry, bool is_dir) struct dentry *upper = ovl_dentry_upper(dentry); int err; - mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); + inode_lock_nested(dir, I_MUTEX_PARENT); err = -ESTALE; if (upper->d_parent == upperdir) { /* Don't let d_delete() think it can reset d_inode */ @@ -618,8 +618,9 @@ static int ovl_remove_upper(struct dentry *dentry, bool is_dir) * sole user of this dentry. Too tricky... Just unhash for * now. */ - d_drop(dentry); - mutex_unlock(&dir->i_mutex); + if (!err) + d_drop(dentry); + inode_unlock(dir); return err; } @@ -903,6 +904,13 @@ static int ovl_rename2(struct inode *olddir, struct dentry *old, if (!overwrite && new_is_dir && !old_opaque && new_opaque) ovl_remove_opaque(newdentry); + /* + * Old dentry now lives in different location. Dentries in + * lowerstack are stale. We cannot drop them here because + * access to them is lockless. This could be only pure upper + * or opaque directory - numlower is zero. Or upper non-dir + * entry - its pureness is tracked by flag opaque. + */ if (old_opaque != new_opaque) { ovl_dentry_set_opaque(old, new_opaque); if (!overwrite) |