dm raid: remove unnecessary discard limits for raid0 and raid10

Commit 29efc390b946 ("md/md0: optimize raid0 discard handling") and
commit d30588b2731f ("md/raid10: improve raid10 discard request")
remove MD raid0's and raid10's inability to properly handle large
discards. So eliminate associated constraints from dm-raid's support.

Depends-on: 29efc390b946 ("md/md0: optimize raid0 discard handling")
Depends-on: d30588b2731f ("md/raid10: improve raid10 discard request")
Reported-by: Matthew Ruffell <matthew.ruffell@canonical.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 67372e1..bf4a467 100644 (file)
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3750,15 +3750,6 @@ 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));
-
-       /*
-        * RAID0 and RAID10 personalities require bio splitting,
-        * RAID1/4/5/6 don't and process large discard bios properly.
-        */
-       if (rs_is_raid0(rs) || rs_is_raid10(rs)) {
-               limits->discard_granularity = chunk_size_bytes;
-               limits->max_discard_sectors = rs->md.chunk_sectors;
-       }
 }
 
 static void raid_postsuspend(struct dm_target *ti)