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 4834d43..d2a3223 100644 (file)
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -974,6 +974,7 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
 
        INIT_WORK(&rs->md.event_work, do_table_event);
        ti->private = rs;
+       ti->num_flush_requests = 1;
 
        mutex_lock(&rs->md.reconfig_mutex);
        ret = md_run(&rs->md);