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md: prevent adding disks with larger logical_block_size to active arrays

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When adding a disk to a md array, avoid updating the array's
logical_block_size to match the new disk. This prevents accidental
partition table loss that renders the array unusable.

The later patch will introduce a way to configure the array's
logical_block_size.

The issue was introduced before Linux 2.6.12-rc2.

Link: https://lore.kernel.org/linux-raid/20250918115759.334067-2-linan666@huaweicloud.com/
Fixes: d2e45eace8 ("[PATCH] Fix raid "bio too big" failures")
Signed-off-by: Li Nan <linan122@huawei.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Yu Kuai <yukuai@fnnas.com>
This commit is contained in:
Li Nan
2025-09-18 19:57:58 +08:00
committed by Yu Kuai
parent a811db3919
commit 6c6b66f65e
1 changed files with 7 additions and 0 deletions
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7
drivers/md/md.c
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@@ -6067,6 +6067,13 @@ int mddev_stack_new_rdev(struct mddev *mddev, struct md_rdev *rdev)
if (mddev_is_dm(mddev))
return 0;
if (queue_logical_block_size(rdev->bdev->bd_disk->queue) >
queue_logical_block_size(mddev->gendisk->queue)) {
pr_err("%s: incompatible logical_block_size, can not add\n",
mdname(mddev));
return -EINVAL;
}
lim = queue_limits_start_update(mddev->gendisk->queue);
queue_limits_stack_bdev(&lim, rdev->bdev, rdev->data_offset,
mddev->gendisk->disk_name);