linux-kernel - [ 059/122] cgroup: cgroup_rm_files() was calling simple

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Message-Id: <20120807221953.610036857@linuxfoundation.org>
Date:	Tue,  7 Aug 2012 15:25:47 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Tejun Heo <tj@...nel.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	Li Zefan <lizefan@...wei.com>
Subject: [ 059/122] cgroup: cgroup_rm_files() was calling simple_unlink() with the wrong inode

From: Greg KH <gregkh@...uxfoundation.org>

3.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tejun Heo <tj@...nel.org>

commit ce27e317ba22b359bde02216afab934dac3af095 upstream.

While refactoring cgroup file removal path, 05ef1d7c4a "cgroup:
introduce struct cfent" incorrectly changed the @dir argument of
simple_unlink() to the inode of the file being deleted instead of that
of the containing directory.

The effect of this bug is minor - ctime and mtime of the parent
weren't properly updated on file deletion.

Fix it by using @cgrp->dentry->d_inode instead.

Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-by: Al Viro <viro@...IV.linux.org.uk>
Acked-by: Li Zefan <lizefan@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/cgroup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -954,7 +954,7 @@ static int cgroup_rm_file(struct cgroup
 
 		dget(d);
 		d_delete(d);
-		simple_unlink(d->d_inode, d);
+		simple_unlink(cgrp->dentry->d_inode, d);
 		list_del_init(&cfe->node);
 		dput(d);
 


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