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>

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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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drivers/md/raid5.c

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