Re: [PATCH 018 of 29] md: Support changing rdev size on running arrays.

[Guoqing Jiang <guoqing.jiang@linux.dev>]

On 11/11/21 11:09 PM, Markus Hochholdinger wrote:
> It's possible, I've found the error:
>    rdev->sb_start = sb_start;
> is missing within md.c within /* minor version 0; superblock after data */
>  From my understanding, this means the new calculated superblock position isn't
> used.
>
> I changed:
> --- a/drivers/md/md.c    2021-09-30 08:11:08.000000000 +0000
> +++ b/drivers/md/md.c     2021-11-11 14:54:10.535633028 +0000
> @@ -2252,6 +2252,7 @@
>   
>                  if (!num_sectors || num_sectors > max_sectors)
>                          num_sectors = max_sectors;
> +               rdev->sb_start = sb_start;
>          }
>          sb = page_address(rdev->sb_page);
>          sb->data_size = cpu_to_le64(num_sectors);
>
> I tested it with 5.10.46 and resizing with superblock version 1.0 is now
> working for me.
>
> If this is correct, how can I get this into longterm 5.10.x and the current
> kernel upstream?

Please refer to submitting-patches.rst and stable-kernel-rules.rst which 
are under
Documentation.

And I think this tag need to be added in your patch.

Fixes: commit d9c0fa509eaf ("md: fix max sectors calculation for super 1.0")

Thanks,
Guoqing