[Cluster-devel] GFS2: Fix glock ref counting bug

[Cluster-devel] GFS2: Fix glock ref counting bug

[Steven Whitehouse]

From 6e6cccc85b8f5b56d31019472fb33807ef571ff5 Mon Sep 17 00:00:00 2001
From: Steven Whitehouse <swhiteho@redhat.com>
Date: Thu, 30 Apr 2009 14:52:58 +0100
Subject: [PATCH] GFS2: Fix glock ref counting bug

Depending on the ordering of events as we go around the
glock shrinker loop, it is possible to drop the ref count
of a glock incorrectly. It doesn't happen very often. This
patch corrects the got_ref variable, fixing the problem.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 1afd9f2..ff49810 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1304,6 +1304,7 @@ static int gfs2_shrink_glock_memory(int nr, gfp_t gfp_mask)
 				nr--;
 				if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
 					gfs2_glock_put(gl);
+				got_ref = 0;
 			}
 			spin_lock(&lru_lock);
 			if (may_demote)
-- 
1.6.0.6