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Date: Thu, 30 Aug 2018 18:36:14 +0200
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH, RFC] xfs: re-enable FIBMAP on reflink; disable for swap
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References: <2eb759e5-2faa-67fd-5c16-c1d8edc42d02@redhat.com> <20180830162545.GA26816@lst.de> <dbe27763-2e69-6e3a-f769-2528eda54940@redhat.com>
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To: Eric Sandeen <sandeen@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>, linux-xfs <linux-xfs@vger.kernel.org>

On Thu, Aug 30, 2018 at 11:31:40AM -0500, Eric Sandeen wrote:
> That's no reason to uniquely disallow it for reflinked files, though;
> the problem is universal.  It's true for fiemap as well.  So I'm not sure
> that's an argument against the patch?

fiemap at least tells you an extent is shared, bmap does not.