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From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-xfs@vger.kernel.org, linux-nvdimm@lists.01.org,
	linux-kernel@vger.kernel.org, rgoldwyn@suse.de,
	gujx@cn.fujitsu.com, david@fromorbit.com, qi.fuli@fujitsu.com
Subject: Re: [RFC PATCH 0/7] xfs: add reflink & dedupe support for fsdax.
Date: Wed, 9 Oct 2019 10:11:52 -0700
Message-ID: <20191009171152.GF13108@magnolia> (raw)
In-Reply-To: <20191009063144.GA4300@infradead.org>

On Tue, Oct 08, 2019 at 11:31:44PM -0700, Christoph Hellwig wrote:
> 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.

Hmm, you're right, we don't actually have a test that checks the
behavior of mwriting all copies of a shared block.  Ok, I'll go write
one.

--D
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Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-31 11:49 Shiyang Ruan
2019-07-31 11:49 ` [RFC PATCH 1/7] dax: Introduce dax_copy_edges() for COW Shiyang Ruan
2019-07-31 11:49 ` [RFC PATCH 2/7] dax: copy data before write Shiyang Ruan
2019-07-31 11:49 ` [RFC PATCH 3/7] dax: replace mmap entry in case of CoW Shiyang Ruan
2019-07-31 11:49 ` [RFC PATCH 4/7] fs: dedup file range to use a compare function Shiyang Ruan
2019-07-31 11:49 ` [RFC PATCH 5/7] dax: memcpy before zeroing range Shiyang Ruan
2019-07-31 11:49 ` [RFC PATCH 6/7] xfs: Add COW handle for fsdax Shiyang Ruan
2019-07-31 11:49 ` [RFC PATCH 7/7] xfs: Add dedupe support " Shiyang Ruan
2019-07-31 20:33 ` [RFC PATCH 0/7] xfs: add reflink & " Goldwyn Rodrigues
2019-08-01  1:37   ` Shiyang Ruan
2019-08-05  0:21     ` Dave Chinner
2019-10-09  6:31 ` Christoph Hellwig
2019-10-09 17:11   ` Darrick J. Wong [this message]
2019-10-10  7:30     ` Dave Chinner

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