linux-kernel - Re: [PATCH v2 00/10] fsdax,xfs: Add reflink&dedupe support for fsdax

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Message-ID: <OSBPR01MB2920E8385E22C0DBBC5283B6F4919@OSBPR01MB2920.jpnprd01.prod.outlook.com>
Date:   Wed, 10 Mar 2021 01:26:18 +0000
From:   "ruansy.fnst@...itsu.com" <ruansy.fnst@...itsu.com>
To:     Goldwyn Rodrigues <rgoldwyn@...e.de>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "darrick.wong@...cle.com" <darrick.wong@...cle.com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "jack@...e.cz" <jack@...e.cz>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        "ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>,
        "david@...morbit.com" <david@...morbit.com>,
        "hch@....de" <hch@....de>
Subject: Re: [PATCH v2 00/10] fsdax,xfs: Add reflink&dedupe support for fsdax

>
> Hi Shiang,
> 
> Thanks for picking up this work.
> 
> On  8:20 26/02, Shiyang Ruan wrote:
> > This patchset is attempt to add CoW support for fsdax, and take XFS,
> > which has both reflink and fsdax feature, as an example.
> 
> How does this work for read sequence for two different files
> mapped to the same extent, both residing in DAX?
> 
> If two different files read the same shared extent, which file
> would resultant page->mapping->host point to?
> 
> This problem is listed as a TODO over dax_associate_entry() and is
> still not fixed.

I have posted another patchset which I called "fix dax-rmap"[1]. It is a
try to solve this problem, but still in disscussion for now.

[1] https://lkml.org/lkml/2021/2/8/347

--
Thanks,
Ruan Shiyang.

> 
> <snip>
> 
> --
> Goldwyn