linux-kernel - Re: [PATCH] swim3: use blk_end_request instead of blk_update

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Message-ID: <20090513055913.GZ4140@kernel.dk>
Date:	Wed, 13 May 2009 07:59:14 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Kiyoshi Ueda <k-ueda@...jp.nec.com>,
	Boaz Harrosh <bharrosh@...asas.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org
Subject: Re: [PATCH] swim3: use blk_end_request instead of
	blk_update_request

On Wed, May 13 2009, Tejun Heo wrote:
> Jens Axboe wrote:
> >>> Yeah, conversion was easy that way.  I think it's sane to have
> >>> blk_update_request() exported as long as request internal tinkering is
> >>> kept in block layer proper.
> >> blk_update_request() is needed for request-based dm to keep the request
> >> completion ordering in bottom-up, although request-based dm is not
> >> in upstream yet.
> >>
> >> Jens, please keep blk_update_request() exported.
> > 
> > I did, I applied the swim3 patches yesterday as well.
> 
> I don't think the patch is correct.  If it calls
> blk_end_request_all(), it should also clear the current request which
> the patch doesn't.  Also, given that the driver doesn't support
> partially failing the request, I think it's correct to fail
> segment-by-segment to avoid merged request failure affects unrelated
> bios.
> 
> Thanks.

OK, I'll back them out for now.

-- 
Jens Axboe

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