From 5769cdd7f046963507601ecda5828de736f89306 Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm@linux-foundation.org>
Date: Fri, 25 Sep 2009 22:01:10 +0200
Subject: [PATCH] mm-only debug patch...

Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 fs/attr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/attr.c b/fs/attr.c
index 96d394bdadd..370642a99db 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -155,6 +155,8 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
 			return -EPERM;
 	}
 
+	WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
+
 	now = current_fs_time(inode->i_sb);
 
 	attr->ia_ctime = now;
-- 
2.11.4.GIT