src/patches/suse-2.6.27.39/patches.fixes/dm_flag_queue_barrier_support

   1 From: Mikulas Patocka <mpatocka@redhat.com>
   2 Subject: dm: set queue ordered mode
   3 Patch-mainline: 2.6.30
   4 References: bnc#496353
   5 Acked-by: Nikanth Karthikesan <knikanth@suse.de>
   6
   7 commit 99360b4c18f7675b50d283301d46d755affe75fd
   8 Author: Mikulas Patocka <mpatocka@redhat.com>
   9 Date:   Thu Apr 2 19:55:39 2009 +0100
  10
  11     dm: set queue ordered mode
  12
  13     Set queue ordered mode.  It doesn't really matter what we set here
  14     because we don't ever put any requests on the queue.  But we need to set
  15     something other than QUEUE_ORDERED_NONE so that __generic_make_request
  16     passes barrier requests to us.
  17
  18     Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
  19     Signed-off-by: Alasdair G Kergon <agk@redhat.com>
  20
  21 ---
  22  drivers/md/dm.c |    1 +
  23  1 file changed, 1 insertion(+)
  24
  25 --- a/drivers/md/dm.c
  26 +++ b/drivers/md/dm.c
  27 @@ -1801,6 +1801,7 @@ static struct mapped_device *alloc_dev(i
  28         md->queue->backing_dev_info.congested_fn = dm_any_congested;
  29         md->queue->backing_dev_info.congested_data = md;
  30         blk_queue_make_request(md->queue, dm_request);
  31 +       blk_queue_ordered(md->queue, QUEUE_ORDERED_DRAIN, NULL);
  32         blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY);
  33         md->queue->unplug_fn = dm_unplug_all;
  34         blk_queue_merge_bvec(md->queue, dm_merge_bvec);