linux-kernel - [PATCH 51/73] union-mount: Create whiteout on rmdir() [ver #2]

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Message-ID: <20120221180351.25235.23932.stgit@warthog.procyon.org.uk>
Date:	Tue, 21 Feb 2012 18:03:52 +0000
From:	David Howells <dhowells@...hat.com>
To:	linux-fsdevel@...r.kernel.org, viro@...IV.linux.org.uk,
	valerie.aurora@...il.com
Cc:	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: [PATCH 51/73] union-mount: Create whiteout on rmdir() [ver #2]

From: Valerie Aurora <vaurora@...hat.com>

Whiteout a deleted directory in a union mounted file system.

Original-author: Valerie Aurora <vaurora@...hat.com>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/namei.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index ce941ac..f9e0d68 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3228,11 +3228,6 @@ static long do_rmdir(int dfd, const char __user *pathname)
 	if (error)
 		return error;
 
-	/* rmdir() on union mounts not implemented yet */
-	error = -EINVAL;
-	if (IS_DIR_UNIONED(nd.path.dentry))
-		goto exit1;
-
 	switch(nd.last_type) {
 	case LAST_DOTDOT:
 		error = -ENOTEMPTY;
@@ -3261,6 +3256,10 @@ static long do_rmdir(int dfd, const char __user *pathname)
 	error = security_path_rmdir(&nd.path, path.dentry);
 	if (error)
 		goto exit4;
+	if (IS_DIR_UNIONED(nd.path.dentry)) {
+		error = do_whiteout(&nd, &path, 1);
+		goto exit4;
+	}
 	error = vfs_rmdir(nd.path.dentry->d_inode, path.dentry);
 exit4:
 	mnt_drop_write(nd.path.mnt);

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