[dm-devel] dm-raid1: keep writing after leg failure

[Lidong Zhong]

>>> On 5/16/2015 at 12:11 AM, in message <20150515161108.GA28234 at redhat.com>, Mike
Snitzer <snitzer at redhat.com> wrote: 
> On Wed, May 13 2015 at  2:04am -0400, 
> Lidong Zhong <lzhong at suse.com> wrote: 
>  
> > Currently if there is a leg failure, the bio will be put into the hold 
> > list until userspace replace/remove the leg. Here we are trying to make 
> > dm-raid1 ignore the failure and keep the following bios going on. 
> > This is because there maybe a temporary path failure in clvmd 
> > which leads to cluster raid1 remove/replace the fake device failure. And 
> > it takes a long time to do the full sync if we readd the device back. 
> >  
> > This patch merges the former five small patches to implement this 
> > feature. The userspace should pass "keep_log" into kernel to make this  
> feature to 
> > take effect when creating dm-raid1, same as "handle_errors". 
> >  
> > Signed-off-by: Lidong Zhong <lzhong at suse.com> 
> > Tested-by: Liuhua Wang <lwang at suse.com> 
>  
> I've staged a revised patch for 4.2 here: 
> https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/commit 
> /?h=for-next&id=164a064dd85801986f3190e6edd119b6fc9a05c5 
>  
> The big things I clarified/cleaned are: 
> 1) keep_log depends on handle_errors feature 
> 2) feature reporting via 'dmsetup table' needed to be decoupled 
>    otherwise any future feature would've forced this same cleanup. 
> 3) Cleaned up header and in-code comments. 
> 4) bumped the target version 
>  
> Please let me know if you see nay issues with this version. 
>  

Hi Mike,

All look good to me. Thanks.

Regards,
Lidong
> Thanks, 
> Mike 
>  
>