dm: set queue ordered mode

Set queue ordered mode.  It doesn't really matter what we set here
because we don't ever put any requests on the queue.  But we need to set
something other than QUEUE_ORDERED_NONE so that __generic_make_request
passes barrier requests to us.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 7867d905ff8984841a1c6cd7bcb769a26cc34636..788ba96a6256aaed6de8625d306cc4d5e33a82f9 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1112,6 +1112,7 @@ static struct mapped_device *alloc_dev(int minor)
        md->queue->backing_dev_info.congested_fn = dm_any_congested;
        md->queue->backing_dev_info.congested_data = md;
        blk_queue_make_request(md->queue, dm_request);
+       blk_queue_ordered(md->queue, QUEUE_ORDERED_DRAIN, NULL);
        blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY);
        md->queue->unplug_fn = dm_unplug_all;
        blk_queue_merge_bvec(md->queue, dm_merge_bvec);