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

[Ruan Shiyang]

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.