Re: [RFC PATCH v2 0/6] fsdax: introduce fs query to support reflink

Ruan Shiyang
2020-12-15T12:00:38Z

Hi Jane

On 2020/12/15 上午4:58, Jane Chu wrote:
> Hi, Shiyang,
>
> On 11/22/2020 4:41 PM, Shiyang Ruan wrote:
>> This patchset is a try to resolve the problem of tracking shared page
>> for fsdax.
>>
>> Change from v1:
>>    - Intorduce ->block_lost() for block device
>>    - Support mapped device
>>    - Add 'not available' warning for realtime device in XFS
>>    - Rebased to v5.10-rc1
>>
>> This patchset moves owner tracking from dax_assocaite_entry() to pmem
>> device, by introducing an interface ->memory_failure() of struct
>> pagemap.  The interface is called by memory_failure() in mm, and
>> implemented by pmem device.  Then pmem device calls its ->block_lost()
>> to find the filesystem which the damaged page located in, and call
>> ->storage_lost() to track files or metadata assocaited with this page.
>> Finally we are able to try to fix the damaged data in filesystem and do
>
> Does that mean clearing poison? if so, would you mind to elaborate
> specifically which change does that?

Recovering data for filesystem (or pmem device) has not been done in
this patchset... I just triggered the handler for the files sharing the
corrupted page here.

--
Thanks,
Ruan Shiyang.

>
> Thanks!
> -jane
>
>> other necessary processing, such as killing processes who are using the
>> files affected.