linux-kernel - Re: [PATCH] swap: redirty page if page write fails on swap file

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Message-ID: <20130417150757.GA21444@cmpxchg.org>
Date:	Wed, 17 Apr 2013 08:07:57 -0700
From:	Johannes Weiner <hannes@...xchg.org>
To:	Jerome Marchand <jmarchan@...hat.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH] swap: redirty page if page write fails on swap file

On Wed, Apr 17, 2013 at 02:11:55PM +0200, Jerome Marchand wrote:
> 
> Since commit 62c230b, swap_writepage() calls direct_IO on swap files.
> However, in that case page isn't redirtied if I/O fails, and is therefore
> handled afterwards as if it has been successfully written to the swap
> file, leading to memory corruption when the page is eventually swapped
> back in.
> This patch sets the page dirty when direct_IO() fails. It fixes a memory
> corruption that happened while using swap-over-NFS.
> 
> Signed-off-by: Jerome Marchand <jmarchan@...hat.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>
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