linux-kernel - Re: [PATCH 1/1] um: ubd: Fix data corruption

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Date:	Mon, 4 Oct 2010 15:51:52 -0400
From:	Chris Frey <cdfrey@...rsquare.net>
To:	Tejun Heo <htejun@...il.com>
Cc:	Jens Axboe <jaxboe@...ionio.com>,
	Richard Weinberger <richard@....at>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jdike@...toit.com" <jdike@...toit.com>,
	"user-mode-linux-devel@...ts.sourceforge.net" 
	<user-mode-linux-devel@...ts.sourceforge.net>,
	"user-mode-linux-user@...ts.sourceforge.net" 
	<user-mode-linux-user@...ts.sourceforge.net>,
	"janjaap@....nl" <janjaap@....nl>,
	"geert@...ux-m68k.org" <geert@...ux-m68k.org>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
	"adobriyan@...il.com" <adobriyan@...il.com>,
	"syzop@...nscan.org" <syzop@...nscan.org>
Subject: Re: [PATCH 1/1] um: ubd: Fix data corruption

On Mon, Oct 04, 2010 at 06:37:36PM +0200, Tejun Heo wrote:
> Hello, sorry about chiming in later.  I was off last week.

No problem, I'm eager to test patches to fix this.


> I think we're on the right track.  The problem with Jens' patch was
> that it didn't consider the fact that blk_end_request() now internally
> updates the current position of the request, so if restart happens
> after some of part of the request is complete it will end up adding
> the offsets multiple times.  I think slightly modifying it to track
> the current position instead of offset should do it.  Chris, can you
> please try the following patch and see whether the problem goes away?

Unfortunately, this patch does not fix it for me.  I applied your patch
to kernel 2.6.35.5, and got the usual error:

EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 566188

Lots of them, actually.

- Chris

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