linux-kernel - [PATCH 28/41] union-mount: call do

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Date:	Wed, 21 Oct 2009 12:19:26 -0700
From:	Valerie Aurora <vaurora@...hat.com>
To:	Jan Blunck <jblunck@...e.de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Andy Whitcroft <apw@...onical.com>,
	Scott James Remnant <scott@...onical.com>,
	Sandu Popa Marius <sandupopamarius@...il.com>,
	Jan Rekorajski <baggins@...h.mimuw.edu.pl>,
	"J. R. Okajima" <hooanon05@...oo.co.jp>,
	Arnd Bergmann <arnd@...db.de>,
	Vladimir Dronnikov <dronnikov@...il.com>,
	Felix Fietkau <nbd@...nwrt.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jan Blunck <jblunck@...e.de>
Subject: [PATCH 28/41] union-mount: call do_whiteout() on unlink and rmdir

From: Jan Blunck <jblunck@...e.de>

Call do_whiteout() when removing files and directories.

Signed-off-by: Jan Blunck <jblunck@...e.de>
Signed-off-by: Valerie Aurora <vaurora@...hat.com>
---
 fs/namei.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index f7ef769..1f2a214 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2898,6 +2898,10 @@ static int do_whiteout(struct nameidata *nd, struct path *path, int isdir)
 	if (err)
 		goto out;
 
+	err = -ENOENT;
+	if (!dentry->d_inode)
+		goto out;
+
 	err = -ENOTEMPTY;
 	if (isdir && !directory_is_empty(path->dentry, path->mnt))
 		goto out;
@@ -3012,6 +3016,10 @@ static long do_rmdir(int dfd, const char __user *pathname)
 	error = hash_lookup_union(&nd, &nd.last, &path);
 	if (error)
 		goto exit2;
+	if (is_unionized(nd.path.dentry, nd.path.mnt)) {
+		error = do_whiteout(&nd, &path, 1);
+		goto exit3;
+	}
 	error = mnt_want_write(nd.path.mnt);
 	if (error)
 		goto exit3;
@@ -3100,6 +3108,10 @@ static long do_unlinkat(int dfd, const char __user *pathname)
 		inode = path.dentry->d_inode;
 		if (inode)
 			atomic_inc(&inode->i_count);
+		if (is_unionized(nd.path.dentry, nd.path.mnt)) {
+			error = do_whiteout(&nd, &path, 0);
+			goto exit2;
+		}
 		error = mnt_want_write(nd.path.mnt);
 		if (error)
 			goto exit2;
-- 
1.6.3.3

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