linux-kernel - [PATCH] ocfs2: send correct UUID to cleancache initialization

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Date:	Mon, 17 Oct 2011 16:47:17 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	ocfs2-devel@....oracle.com
Cc:	linux-kernel@...r.kernel.org, Joel Becker <jlbec@...lplan.org>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Sunil Mushran <sunil.mushran@...cle.com>
Subject: [PATCH] ocfs2: send correct UUID to cleancache initialization

ocfs2: Fix cleancache initialization call to correctly pass uuid

As reported by Steven Whitehouse in https://lkml.org/lkml/2011/5/27/221 
the ocfs2 volume UUID is incorrectly passed to cleancache.
As a result, shared-ephemeral tmem pools will not actually
be created; instead they will be private (unshared) which
misses out on a major benefit of tmem.

Reported-by: Steven Whitehouse <swhiteho@...hat.com>
Signed-off-by: Dan Magenheimer <dan.magenheimer@...cle.com>

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -2374,7 +2374,7 @@ static int ocfs2_initialize_super(struct super_block *sb,
 		mlog_errno(status);
 		goto bail;
 	}
-	cleancache_init_shared_fs((char *)&uuid_net_key, sb);
+	cleancache_init_shared_fs((char *)&di->id2.i_super.s_uuid, sb);
 
 bail:
 	return status;
--
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