From: Jonathan E Brassow <jbrassow@redhat.com>
Date: Wed, 7 Mar 2012 19:09:48 +0000 (+0000)
Subject: dm raid: fix flush support
X-Git-Tag: firefly_0821_release~7541^2~1601
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1a5fab846c9b97358a547031d27eabc1e257bd52;p=firefly-linux-kernel-4.4.55.git

dm raid: fix flush support

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@redhat.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index e5d8904fc8f6..437ae1825f13 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -468,6 +468,7 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
 	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);