[dm-devel] [RFC][PATCH] dm-mirror: fix data corruption

[Jun'ichi Nomura]

Hi Yasui-san,

Takahiro Yasui wrote:
> This is a prototype patch to fix data corruption issue on dm-raid1.
> It is just a draft patch and is not tested well, but let me post it
> to review and discuss this in-kernel superblock approach.
> 
> I appreciate your comments and suggestions.
<snip>
>   * Introduce superblock area
> 
>     A superblock area is related to a mirror leg on a one-to-one basis and
>     keeps a sequential number to decide the default mirror when the mirror
>     is resumed.

If you are to introduce kernel-managed RAID1 superblock,
isn't it possible to use the on-disk format compatible to md's?
Then the kernel code to handle the superblock may be shared between
md and dm in future, which I think is even better and would help
dm/md convergence.

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation