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

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Message-ID: <5180C6C1.6010000@gmail.com>
Date:	Wed, 01 May 2013 15:39:45 +0800
From:	Simon Jeons <simon.jeons@...il.com>
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

Ping, ;-)
On 04/18/2013 08:13 AM, Simon Jeons wrote:
> Hi Jerome,
> On 04/17/2013 08:11 PM, 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
>
> If swapfile has related page cache which cached swapfile in memory? It 
> is not necessary, correct?
>
>> corruption that happened while using swap-over-NFS.
>>
>> Signed-off-by: Jerome Marchand <jmarchan@...hat.com>
>> ---
>>   mm/page_io.c |    2 ++
>>   1 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/mm/page_io.c b/mm/page_io.c
>> index 78eee32..04ca00d 100644
>> --- a/mm/page_io.c
>> +++ b/mm/page_io.c
>> @@ -222,6 +222,8 @@ int swap_writepage(struct page *page, struct 
>> writeback_control *wbc)
>>           if (ret == PAGE_SIZE) {
>>               count_vm_event(PSWPOUT);
>>               ret = 0;
>> +        } else {
>> +            set_page_dirty(page);
>>           }
>>           return ret;
>>       }
>>
>> -- 
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>> see: http://www.linux-mm.org/ .
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>

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