[PATCH] Add barrier support to dm-raid

[Jonathan Brassow <jbrassow@xxxxxxxxxx>]

Add barrier support to dm-raid.

MD has support for barriers.  DM core has support for barriers.  Set the
variable necessary to indicate to DM core that it is ok to pass down
barrier requests - which dm-raid will simply pass along to MD.

Signed-off-by: Jonathan Brassow <jbrassow@xxxxxxxxxx>

Index: linux-upstream/drivers/md/dm-raid.c
===================================================================
--- linux-upstream.orig/drivers/md/dm-raid.c
+++ linux-upstream/drivers/md/dm-raid.c
@@ -971,6 +971,7 @@ static int raid_ctr(struct dm_target *ti
 
 	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);


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