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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>
This commit is contained in:
Yu Kuai
2026-08-03 03:50:32 +08:00
parent 3fa5499f32
commit ecb66a97af
1 changed files with 4 additions and 0 deletions
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4
drivers/md/raid10.c
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@@ -4245,6 +4245,10 @@ static int raid10_check_reshape(struct mddev *mddev)
if (conf->geo.far_copies != 1 && !conf->geo.far_offset)
return -EINVAL;
if (mddev->bitmap_id == ID_LLBITMAP &&
mddev->new_chunk_sectors &&
mddev->new_chunk_sectors < mddev->chunk_sectors)
return -EOPNOTSUPP;
if (setup_geo(&geo, mddev, geo_start) != conf->copies)
/* mustn't change number of copies */