linux-kernel - [ 66/68] dm raid: fix flush support

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Message-Id: <20120309190220.247833047@linuxfoundation.org>
Date:	Fri, 09 Mar 2012 11:03:20 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Jonathan Brassow <jbrassow@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>,
	Alasdair G Kergon <agk@...hat.com>
Subject: [ 66/68] dm raid: fix flush support

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jonathan E Brassow <jbrassow@...hat.com>

commit 0ca93de9b789e0eb05e103f0c04de72df13da73a upstream.

Fix dm-raid flush support.

Both md and dm have support for flush, but the dm-raid target
forgot to set the flag to indicate that flushes should be
passed on.  (Important for data integrity e.g. with writeback cache
enabled.)

Signed-off-by: Jonathan Brassow <jbrassow@...hat.com>
Acked-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Alasdair G Kergon <agk@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm-raid.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -468,6 +468,7 @@ static int raid_ctr(struct dm_target *ti
 	INIT_WORK(&rs->md.event_work, do_table_event);
 	ti->split_io = rs->md.chunk_sectors;
 	ti->private = rs;
+	ti->num_flush_requests = 1;
 
 	mutex_lock(&rs->md.reconfig_mutex);
 	ret = md_run(&rs->md);


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