From e2782f560c298efc2e23c7e54b3acf54e8a6ba72 Mon Sep 17 00:00:00 2001
From: Song Liu <songliubraving@fb.com>
Date: Wed, 9 Dec 2020 13:53:31 -0800
Subject: [PATCH] Revert "dm raid: remove unnecessary discard limits for
raid10"
This reverts commit f0e90b6c663a7e3b4736cb318c6c7c589f152c28.
Matthew Ruffell reported data corruption in raid10 due to the changes
in discard handling [1]. Revert these changes before we find a proper fix.
[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1907262/
Cc: Matthew Ruffell <matthew.ruffell@canonical.com>
Cc: Xiao Ni <xni@redhat.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
drivers/md/dm-raid.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 9c1f7c4de65b3..dc8568ab96f24 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3728,6 +3728,17 @@ 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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