From: Valerie Aurora <vaurora@xxxxxxxxxx>
Whiteout an unlinked directory entry in a union mounted file system.
Signed-off-by: Valerie Aurora <valerie.aurora@xxxxxxxxx>
---
fs/namei.c | 9 ++++-----
1 files changed, 4 insertions(+), 5 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 531a0e0..83f9c62 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2698,11 +2698,6 @@ static long do_unlinkat(int dfd, const char __user *pathname)
if (nd.last_type != LAST_NORM)
goto exit1;
- /* unlink() on union mounts not implemented yet */
- error = -EINVAL;
- if (IS_DIR_UNIONED(nd.path.dentry))
- goto exit1;
-
nd.flags &= ~LOOKUP_PARENT;
mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
@@ -2720,6 +2715,10 @@ static long do_unlinkat(int dfd, const char __user *pathname)
error = security_path_unlink(&nd.path, path.dentry);
if (error)
goto exit3;
+ if (IS_DIR_UNIONED(nd.path.dentry)) {
+ error = do_whiteout(&nd, &path, 0);
+ goto exit3;
+ }
error = vfs_unlink(nd.path.dentry->d_inode, path.dentry);
exit3:
mnt_drop_write(nd.path.mnt);
--
1.7.0.4
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