linux-kernel - [PATCH 5.10 2/2] Revert "dm raid: fix discard limits for raid1 and raid10"

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Date:   Mon, 14 Dec 2020 18:06:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dave Jones <davej@...emonkey.org.uk>,
        Mike Snitzer <snitzer@...hat.com>,
        Zdenek Kabelac <zkabelac@...hat.com>,
        Mikulas Patocka <mpatocka@...hat.com>
Subject: [PATCH 5.10 2/2] Revert "dm raid: fix discard limits for raid1 and raid10"

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

This reverts commit e0910c8e4f87bb9f767e61a778b0d9271c4dc512.

It causes problems :(

Reported-by: Dave Jones <davej@...emonkey.org.uk>
Reported-by: Mike Snitzer <snitzer@...hat.com>
Cc: Zdenek Kabelac <zkabelac@...hat.com>
Cc: Mikulas Patocka <mpatocka@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/md/dm-raid.c |   12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3730,14 +3730,12 @@ static void raid_io_hints(struct dm_targ
 	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.
+	 * RAID1 and RAID10 personalities require bio splitting,
+	 * RAID0/4/5/6 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);
+	if (rs_is_raid1(rs) || rs_is_raid10(rs)) {
+		limits->discard_granularity = chunk_size_bytes;
+		limits->max_discard_sectors = rs->md.chunk_sectors;
 	}
 }