Re: [PATCH] block: restore multiple bd_link_disk_holder() support

Jun'ichi Nomura
2011-01-14T07:39:33Z

Hi,

On 01/14/11 03:42, Milan Broz wrote:
>> Milan, Jun, can you guys please verify this works correctly for the
>> multi holder dm case? Thank you.
>
> Hi,
>
> unfortunately not. And the problem is much worse,
> it breaks lvm resize operation completely.

For quick testing, try this:
("/dev/sdf" can be other block device.
"testA" and "testB" can be other dm names which aren't used in
your machine.)

# echo "0 10 linear /dev/sdf 0" | dmsetup create testA
# echo "0 10 linear /dev/sdf 10" | dmsetup create testB
(at this point, /dev/sdf has multiple holders)
# echo "0 20 linear /dev/sdf 10" | dmsetup load testB
(at this point, /dev/mapper/testB has 2 claims on /dev/sdf)
# dmsetup resume testB
(/dev/mapper/testB has 1 claim on /dev/sdf)
# dmsetup remove testA
# dmsetup remove testB

Thanks,
--
Jun'ichi Nomura, NEC Corporation