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Date:   Sat, 13 Mar 2021 14:07:05 +0100
From:   Adam Borowski <kilobyte@angband.pl>
To:     Matthew Wilcox <willy@infradead.org>
Cc:     Goldwyn Rodrigues <rgoldwyn@suse.de>,
        Neal Gompa <ngompa13@gmail.com>,
        Shiyang Ruan <ruansy.fnst@fujitsu.com>,
        linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
        linux-nvdimm@lists.01.org,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        darrick.wong@oracle.com, jack@suse.cz, viro@zeniv.linux.org.uk,
        Btrfs BTRFS <linux-btrfs@vger.kernel.org>,
        ocfs2-devel@oss.oracle.com, david@fromorbit.com, hch@lst.de
Subject: Re: [PATCH v2 00/10] fsdax,xfs: Add reflink&dedupe support for fsdax
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On Wed, Mar 10, 2021 at 02:26:43PM +0000, Matthew Wilcox wrote:
> On Wed, Mar 10, 2021 at 08:21:59AM -0600, Goldwyn Rodrigues wrote:
> > DAX on btrfs has been attempted[1]. Of course, we could not
> 
> But why?  A completeness fetish?  I don't understand why you decided
> to do this work.

* xfs can shapshot only single files, btrfs entire subvolumes
* btrfs-send|receive
* enumeration of changed parts of a file


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