From 91bf812da0c4f2efd0883fe02dc057853de731b1 Mon Sep 17 00:00:00 2001
From: Dan Magenheimer <dan.magenheimer@oracle.com>
Date: Fri, 8 Oct 2010 13:45:20 -0600
Subject: ocfs2: add cleancache support

This eighth patch of eight in this cleancache series "opts-in"
cleancache for ocfs2.  Clustered filesystems must explicitly enable
cleancache by calling cleancache_init_shared_fs anytime an instance
of the filesystem is mounted.  Ocfs2 is currently the only user of
the clustered filesystem interface but nevertheless, the cleancache
hooks in the VFS layer are sufficient for ocfs2 including the matching
cleancache_flush_fs hook which must be called on unmount.

Details and a FAQ can be found in Documentation/vm/cleancache.txt

[v5: jeremy@goop.org: simplify init hook and any future fs init changes]
Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Reviewed-by: Jeremy Fitzhardinge <jeremy@goop.org>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Rik Van Riel <riel@redhat.com>
Cc: Jan Beulich <JBeulich@novell.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Andreas Dilger <adilger@sun.com>
Cc: Ted Ts'o <tytso@mit.edu>
Cc: Nitin Gupta <ngupta@vflare.org>
---
 fs/ocfs2/super.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'fs/ocfs2')

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index fa1be1b304d1..e3f0a4e046db 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -42,6 +42,7 @@
 #include <linux/seq_file.h>
 #include <linux/quotaops.h>
 #include <linux/smp_lock.h>
+#include <linux/cleancache.h>
 
 #define MLOG_MASK_PREFIX ML_SUPER
 #include <cluster/masklog.h>
@@ -2284,6 +2285,7 @@ static int ocfs2_initialize_super(struct super_block *sb,
 		mlog_errno(status);
 		goto bail;
 	}
+	cleancache_init_shared_fs((char *)&uuid_net_key, sb);
 
 bail:
 	mlog_exit(status);
-- 
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