[Cluster-devel] [GFS2] Fix calculation of demote state

[Steven Whitehouse <swhiteho@redhat.com>]

From 6a67cf1cd39fe5a2f634023200abc751fc3a1564 Mon Sep 17 00:00:00 2001
From: Josef Whiter <jwhiter@redhat.com>
Date: Mon, 23 Jul 2007 10:02:40 +0100
Subject: [PATCH] [GFS2] Fix calculation of demote state

If a glock is in the exclusive state and a request for demote to
deferred has been received, then further requests for demote to
shared are being ignored. This patch fixes that by ensuring that
we demote to unlocked in that case.

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

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 6a3eeba..6b6ae45 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -697,8 +697,9 @@ static void handle_callback(struct gfs2_glock *gl, unsigned int state, int remot
 			}
 			return;
 		}
-	} else if (gl->gl_demote_state != LM_ST_UNLOCKED) {
-		gl->gl_demote_state = state;
+	} else if (gl->gl_demote_state != LM_ST_UNLOCKED &&
+			gl->gl_demote_state != state) {
+		gl->gl_demote_state = LM_ST_UNLOCKED;
 	}
 	spin_unlock(&gl->gl_spin);
 }
-- 
1.5.1.2