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md/raid5: reject llbitmap reshape when md chunk shrinks

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llbitmap reshape keeps one live bitmap and cannot safely make an
existing bitmap bit cover a smaller data range.

The llbitmap chunksize itself will not shrink when mddev->chunk_sectors
stays the same or grows. However, shrinking mddev->chunk_sectors shrinks
sectors_per_chunk used by raid5_bitmap_sector_map(). That can shrink the
effective data range covered by each bit across the old and new RAID5
geometry. Reject that reshape while llbitmap is active.

Tested-by: Mykola Marzhan <mykola@meshstor.io>
Link: https://patch.msgid.link/20260802195038.164272-28-yukuai@kernel.org
Signed-off-by: Yu Kuai <yukuai@fygo.io>
This commit is contained in:
Yu Kuai
2026-08-03 03:50:36 +08:00
parent 9f59258d30
commit 05a1b89689
1 changed files with 3 additions and 0 deletions
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3
drivers/md/raid5.c
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@@ -8580,6 +8580,9 @@ static int check_reshape(struct mddev *mddev)
if (!check_stripe_cache(mddev))
return -ENOSPC;
if (mddev->bitmap_id == ID_LLBITMAP &&
mddev->new_chunk_sectors < mddev->chunk_sectors)
return -EOPNOTSUPP;
if (mddev->new_chunk_sectors > mddev->chunk_sectors ||
mddev->delta_disks > 0)
if (resize_chunks(conf,