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Date:   Tue, 10 May 2022 02:29:35 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     "Darrick J. Wong" <djwong@kernel.org>
Cc:     Amir Goldstein <amir73il@gmail.com>,
        Dave Chinner <david@fromorbit.com>,
        linux-xfs <linux-xfs@vger.kernel.org>
Subject: Re: [QUESTION] Upgrade xfs filesystem to reflink support?
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 <20220509182043.GW27195@magnolia>
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On Mon, May 09, 2022 at 11:20:43AM -0700, Darrick J. Wong wrote:
> > Is there any a priori NACK or exceptional challenges w.r.t implementing
> > upgrade of xfs to reflink support?
> 
> No, just lack of immediate user demand + time to develop and merge code
> + time to QA the whole mess to make sure it doesn't introduce any
> messes.

I also have vague memory I did an in-kernel online upgrade back in the
day but we decided to not bother in the end.  Maybe some list archive
search could find it.