From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [0/4] DST: Distributed storage.
Date: Tue, 4 Dec 2007 16:56:26 +0000
Message-ID: <20071204165625.GA14995@infradead.org>
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Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru>,
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	linux-fsdevel@vger.kernel.org
To: Mike Snitzer <snitzer@gmail.com>
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> >  * fixed bug with XFS metadata update (it can provide slab pages to the
> >         DST, so it is not allowed to transfer them using ->sendpage())

xfs hasn't been doing that anymore for quite a while.  Block drivers
don't need hacks for it anymore, epsecially as it's not reliably
detectable.