diff options
| author | Yu Kuai <yukuai@fygo.io> | 2026-08-03 03:50:32 +0800 |
|---|---|---|
| committer | Yu Kuai <yukuai@fygo.io> | 2026-08-07 14:43:35 +0800 |
| commit | ecb66a97af620135f207cddabeb7f589510640fc (patch) | |
| tree | 4577cf495329fd4f0bc604d406a0c832f1f966f0 | |
| parent | 3fa5499f32f16133e32c9fb696bc6c0a07483396 (diff) | |
md/raid10: reject llbitmap reshape when md chunk shrinks
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>
| -rw-r--r-- | drivers/md/raid10.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index ed3c6fbe65f7..1c3393467667 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -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 */ |