dm: remove queue next_ordered workaround for barriers

This patch removes DM's bio-based vs request-based conditional setting
of next_ordered.  For bio-based DM the next_ordered check is no longer a
concern (as that check is now in the __make_request path).  For
request-based DM the default of QUEUE_ORDERED_NONE is now appropriate.

bio-based DM was changed to work-around the previously misplaced
next_ordered check with this commit:
99360b4c18f7675b50d283301d46d755affe75fd

request-based DM does not yet support barriers but reacted to the above
bio-based DM change with this commit:
5d67aa2366ccb8257d103d0b43df855605c3c086

The above changes are no longer needed given Neil Brown's recent fix to
put the next_ordered check in the __make_request path:
db64f680ba4b5c56c4be59f0698000df89ff0281

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: NeilBrown <neilb@suse.de>
Acked-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 0 insertions, 5 deletions

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 2cba557d9e61..5d16d06613aa 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -830,11 +830,6 @@ unsigned dm_table_get_type(struct dm_table *t)
         return t->type;
 }
 
-bool dm_table_bio_based(struct dm_table *t)
-{
-        return dm_table_get_type(t) == DM_TYPE_BIO_BASED;
-}
-
 bool dm_table_request_based(struct dm_table *t)
 {
         return dm_table_get_type(t) == DM_TYPE_REQUEST_BASED;