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SubjectRe: Revert "dm raid: remove unnecessary discard limits for raid10"
On Wed, Dec 09 2020 at  4:58pm -0500,
Song Liu <songliubraving@fb.com> wrote:

> 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>
> 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)
> --
> 2.24.1
>

Short of you sending a v2 pull request to Jens...

Jens please pick this up once you pull Song's MD pull that reverts all
the MD raid10 discard changes.

Thanks!

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

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