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Date: Tue, 8 Oct 2019 23:31:44 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Shiyang Ruan <ruansy.fnst@cn.fujitsu.com>
Subject: Re: [RFC PATCH 0/7] xfs: add reflink & dedupe support for fsdax.
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CC: linux-xfs@vger.kernel.org, linux-nvdimm@lists.01.org, darrick.wong@oracle.com, linux-kernel@vger.kernel.org, rgoldwyn@suse.de, gujx@cn.fujitsu.com, david@fromorbit.com, qi.fuli@fujitsu.com
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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.
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