linux-kernel - Re: [PATCH 03/10] mm: Add support for a filesystem to control swap files

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Date:	Mon, 12 Sep 2011 11:04:45 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Mel Gorman <mgorman@...e.de>, Linux-MM <linux-mm@...ck.org>,
	Linux-Netdev <netdev@...r.kernel.org>,
	Linux-NFS <linux-nfs@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Neil Brown <neilb@...e.de>
Subject: Re: [PATCH 03/10] mm: Add support for a filesystem to control swap
 files

On Fri, 2011-09-09 at 09:36 -0400, Christoph Hellwig wrote:
> The equivalent of ->direct_IO should be used for both reads and writes.

So the difference between DIO and swapIO is that swapIO needs the block
map pinned in memory.. So at the very least you'll need those
swap_{activate,deactivate} aops. The read/write-page thingies could
indeed be shared with DIO.


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