Re: [PATCH v4 00/10] Implement device scrub/replace for RAID56

[Miao Xie <miaox@cn.fujitsu.com>]

On Tue, 2 Dec 2014 08:28:22 -0500, Chris Mason wrote:
> On Tue, Dec 2, 2014 at 7:39 AM, Miao Xie <miaox@cn.fujitsu.com> wrote:
>> This patchset implement the device scrub/replace function for RAID56, the
>> most implementation of the common data is similar to the other RAID type.
>> The differentia or difficulty is the parity process. The basic idea is reading
>> and check the data which has checksum out of the raid56 stripe lock, if the
>> data is right, then lock the raid56 stripe, read out the other data in the
>> same stripe, if no IO error happens, calculate the parity and check the
>> original one, if the original parity is right, the scrub parity passes.
>> or write out the new one. But if the common data(not parity) that we read out
>> is wrong, we will try to recover it, and then check and repair the parity.
>>
>> And in order to avoid making the code more and more complex, we copy some
>> code of common data process for the parity, the cleanup work is in my
>> TODO list.
>>
>> We have done some test, the patchset worked well. Of course, more tests
>> are welcome. If you are interesting to use it or test it, you can pull
>> the patchset from
>>
>>   https://github.com/miaoxie/linux-btrfs.git raid56-scrub-replace
>>
>> Changelog v3 -> v4:
>> - Fix the problem that the scrub's raid bio was cached, which was reported
>>   by Chris.
>> - Remove the 10st patch, the deadlock that was described in that patch doesn't
>>   exist on the current kernel.
>> - Rebase the patchset to the top of integration branch
> 
> Thanks, I'll try this today.  I need to rebase in a new version of the RCU patches, can you please cook one on top of v3.18-rc6 instead?

I have updated my raid56-scrub-replace branch, please re-pull it.
  https://github.com/miaoxie/linux-btrfs.git raid56-scrub-replace

The v4 patchset in the mail list can be applied on v3.18-rc6 successfully, so
I don't update it.

Thanks
Miao