linux-kernel - Re: [RFC PATCH 0/7] xfs: add reflink & dedupe support for fsdax.

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Date:   Tue, 8 Oct 2019 23:31:44 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Shiyang Ruan <ruansy.fnst@...fujitsu.com>
Cc:     linux-xfs@...r.kernel.org, linux-nvdimm@...ts.01.org,
        darrick.wong@...cle.com, linux-kernel@...r.kernel.org,
        rgoldwyn@...e.de, gujx@...fujitsu.com, david@...morbit.com,
        qi.fuli@...itsu.com, caoj.fnst@...fujitsu.com
Subject: Re: [RFC PATCH 0/7] xfs: add reflink & dedupe support for fsdax.

Btw, I just had a chat with Dan last week on this.  And he pointed out
that while this series deals with the read/write path issues of 
reflink on DAX it doesn't deal with the mmap side issue that
page->mapping and page->index can point back to exactly one file.

I think we want a few xfstests that reflink a file and then use the
different links using mmap, as that should blow up pretty reliably.