linux-kernel - [PATCH 3/3] GFS2: Skip check for mandatory locks when unlocking

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Date:	Thu, 11 Mar 2010 17:22:01 +0000
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	linux-kernel@...r.kernel.org, cluster-devel@...hat.com
Cc:	Sachin Prabhu <sprabhu@...hat.com>,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH 3/3] GFS2: Skip check for mandatory locks when unlocking

From: Sachin Prabhu <sprabhu@...hat.com>

gfs2_lock() will skip locks on file which have mode set to 02666. This is a problem in cases where the mode of the file is changed after a process has obtained a lock on the file. Such a lock will be skipped and will result in a BUG in locks_remove_flock().

gfs2_lock() should skip the check for mandatory locks when unlocking a file.

Signed-off-by: Sachin Prabhu <sprabhu@...hat.com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
---
 fs/gfs2/file.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index a6abbae..e6dd2ae 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -640,7 +640,7 @@ static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
 
 	if (!(fl->fl_flags & FL_POSIX))
 		return -ENOLCK;
-	if (__mandatory_lock(&ip->i_inode))
+	if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
 		return -ENOLCK;
 
 	if (cmd == F_CANCELLK) {
-- 
1.6.2.5

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