From f0e90b6c663a7e3b4736cb318c6c7c589f152c28 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Thu, 24 Sep 2020 16:40:12 -0400
Subject: [PATCH] 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>
---
drivers/md/dm-raid.c | 11 -----------
1 file changed, 11 deletions(-)
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index dc8568ab96f243..9c1f7c4de65b35 100644
--- 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)
--
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