dm raid: remove unnecessary discard limits for raid10

Commit bcc90d280465e ("md/raid10: improve raid10 discard request")
removes raid10's inability to properly handle large discards.  So
eliminate associated constraint from dm-raid's raid10 support.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index dc8568a..9c1f7c4 100644 (file)
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3728,17 +3728,6 @@ static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
 
        blk_limits_io_min(limits, chunk_size_bytes);
        blk_limits_io_opt(limits, chunk_size_bytes * mddev_data_stripes(rs));
-
-       /*
-        * RAID10 personality requires bio splitting,
-        * RAID0/1/4/5/6 don't and process large discard bios properly.
-        */
-       if (rs_is_raid10(rs)) {
-               limits->discard_granularity = max(chunk_size_bytes,
-                                                 limits->discard_granularity);
-               limits->max_discard_sectors = min_not_zero(rs->md.chunk_sectors,
-                                                          limits->max_discard_sectors);
-       }
 }
 
 static void raid_postsuspend(struct dm_target *ti)