llbitmap reshape keeps one live bitmap and only supports growing the
tracked chunk geometry. Reject RAID10 reshape attempts that would shrink
the llbitmap chunk size.
Signed-off-by: Yu Kuai <yukuai@fnnas.com>
---
drivers/md/raid10.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 4901ebe45c87..ad19257c79fb 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4260,6 +4260,10 @@ 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 */
--
2.51.0