Re: [PATCH v3 1/2] md: Fix logical_block_size configuration being overwritten

[Xiao Ni]

On Fri, Dec 26, 2025 at 10:54 AM <linan666@xxxxxxxxxxxxxxx> wrote:
>
> From: Li Nan <linan122@xxxxxxxxxx>
>
> In super_1_validate(), mddev->logical_block_size is directly overwritten
> with the value from metadata. This causes the previously configured lbs
> to be lost, making the configuration ineffective. Fix it.
>
> Fixes: 62ed1b582246 ("md: allow configuring logical block size")
> Signed-off-by: Li Nan <linan122@xxxxxxxxxx>
> Reviewed-by: Yu Kuai <yukuai@xxxxxxxxx>
> ---
>  drivers/md/md.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index e5922a682953..7c0dd94a4d25 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -1999,7 +1999,6 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *freshest, struc
>                 mddev->layout = le32_to_cpu(sb->layout);
>                 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
>                 mddev->dev_sectors = le64_to_cpu(sb->size);
> -               mddev->logical_block_size = le32_to_cpu(sb->logical_block_size);
>                 mddev->events = ev1;
>                 mddev->bitmap_info.offset = 0;
>                 mddev->bitmap_info.space = 0;
> @@ -2015,6 +2014,9 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *freshest, struc
>
>                 mddev->max_disks =  (4096-256)/2;
>
> +               if (!mddev->logical_block_size)
> +                       mddev->logical_block_size = le32_to_cpu(sb->logical_block_size);
> +
>                 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
>                     mddev->bitmap_info.file == NULL) {
>                         mddev->bitmap_info.offset =
> --
> 2.39.2
>

Reviewed-by: Xiao Ni <xni@xxxxxxxxxx>