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

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Message-ID: <YEy4+SPUvQkL44PQ@angband.pl>
Date:   Sat, 13 Mar 2021 14:07:05 +0100
From:   Adam Borowski <kilobyte@...band.pl>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Goldwyn Rodrigues <rgoldwyn@...e.de>,
        Neal Gompa <ngompa13@...il.com>,
        Shiyang Ruan <ruansy.fnst@...itsu.com>,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-nvdimm@...ts.01.org,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        darrick.wong@...cle.com, jack@...e.cz, viro@...iv.linux.org.uk,
        Btrfs BTRFS <linux-btrfs@...r.kernel.org>,
        ocfs2-devel@....oracle.com, david@...morbit.com, hch@....de
Subject: Re: [PATCH v2 00/10] fsdax,xfs: Add reflink&dedupe support for fsdax

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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