Am Freitag, 12. November 2021, 09:22:26 CET schrieb Guoqing Jiang:

On 11/11/21 11:09 PM, Markus Hochholdinger wrote:

quoted

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")

Many thanks, this was very helpful for me.


-- 
Mfg

Markus Hochholdinger