From: Valerie Aurora <vaurora@xxxxxxxxxx>
Whiteout an unlinked directory entry in a union mounted file system.
---
fs/namei.c | 9 ++++-----
1 files changed, 4 insertions(+), 5 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 4a01441..a168681 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3239,11 +3239,6 @@ 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);
@@ -3260,6 +3255,10 @@ 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);
--
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