md/raid10: 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 can
shrink the effective data range covered by each bit for the RAID10
reshape geometry. Reject that reshape while llbitmap is active.

Tested-by: Mykola Marzhan <mykola@meshstor.io>
Link: https://patch.msgid.link/20260802195038.164272-24-yukuai@kernel.org
Signed-off-by: Yu Kuai <yukuai@fygo.io>

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Yu Kuai 2026-08-03 03:50:32 +08:00

parent 3fa5499f32

commit ecb66a97af

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drivers/md/raid10.c

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