From: Steven Whitehouse <swhiteho@redhat.com>
Subject: [RHEL 5.1] [GFS2] Get super block a different way (bz #306621)
Date: Wed, 26 Sep 2007 11:51:51 +0100
Bugzilla: 306621
Message-Id: <1190803911.3407.4.camel@menhir.chygwyn.com>
Changelog: [GFS2] Get super block a different way


Hi,

The below is an upstream patch which fixes bz #306621 reported and fix tested by
Wendy Cheng. 

Steve.



>From 24647918647d19bb02dfa3e7d92382921e4cbcd1 Mon Sep 17 00:00:00 2001

The mapping may be NULL by the time the I/O has completed, so
we now get the superblock by a different route (via the bd and glock)
to avoid this problem.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Cc: Wendy Cheng <wcheng@redhat.com>

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index ee70467..7df7024 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -513,7 +513,8 @@ struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp)
 static void gfs2_fake_write_endio(struct buffer_head *bh, int uptodate)
 {
 	struct buffer_head *real_bh = bh->b_private;
-	struct gfs2_sbd *sdp = GFS2_SB(real_bh->b_page->mapping->host);
+	struct gfs2_bufdata *bd = real_bh->b_private;
+	struct gfs2_sbd *sdp = bd->bd_gl->gl_sbd;
 
 	end_buffer_write_sync(bh, uptodate);
 	free_buffer_head(bh);
-- 
1.5.1.2