linux-kernel - Re: [PATCH 1/3] block: let blk_end_request

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Message-Id: <20090511181242D.fujita.tomonori@lab.ntt.co.jp>
Date:	Mon, 11 May 2009 18:11:32 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	jens.axboe@...cle.com
Cc:	fujita.tomonori@....ntt.co.jp, tj@...nel.org,
	James.Bottomley@...senPartnership.com, bharrosh@...asas.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] block: let blk_end_request_all handle bidi requests

On Mon, 11 May 2009 11:06:30 +0200
Jens Axboe <jens.axboe@...cle.com> wrote:

> On Mon, May 11 2009, FUJITA Tomonori wrote:
> > blk_end_request_all() and __blk_end_request_all() should finish all
> > bytes including bidi, by definition. That's what all bidi users need ,
> > bidi requests must be complete as a whole (partial completion is
> > impossible).
> > 
> > Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> > ---
> >  include/linux/blkdev.h |   12 ++++++++++--
> >  1 files changed, 10 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> > index 8919683..3b5c564 100644
> > --- a/include/linux/blkdev.h
> > +++ b/include/linux/blkdev.h
> > @@ -911,8 +911,12 @@ static inline bool blk_end_request(struct request *rq, int error,
> >  static inline void blk_end_request_all(struct request *rq, int error)
> >  {
> >  	bool pending;
> > +	unsigned int bidi_bytes = 0;
> >  
> > -	pending = blk_end_request(rq, error, blk_rq_bytes(rq));
> > +	if (unlikely(blk_bidi_rq(rq)))
> > +		bidi_bytes = blk_rq_bytes(rq->next_rq);
> > +
> > +	pending = blk_end_bidi_request(rq, error, blk_rq_bytes(rq), bidi_bytes);
> >  	BUG_ON(pending);
> >  }
> >  
> > @@ -963,8 +967,12 @@ static inline bool __blk_end_request(struct request *rq, int error,
> >  static inline void __blk_end_request_all(struct request *rq, int error)
> >  {
> >  	bool pending;
> > +	unsigned int bidi_bytes = 0;
> > +
> > +	if (unlikely(blk_bidi_rq(rq)))
> > +		bidi_bytes = blk_rq_bytes(rq->next_rq);
> >  
> > -	pending = __blk_end_request(rq, error, blk_rq_bytes(rq));
> > +	pending = __blk_end_bidi_request(rq, error, blk_rq_bytes(rq), bidi_bytes);
> >  	BUG_ON(pending);
> >  }
> 
> Looks ok, perhaps we can next get rid of the bidi naming? It's all
> pretty much folded into one anyway, using __blk_end_bidi_request() from
> generic end-request handling looks confusing.

Yeah, agreed; the bidi name is confusing. I'll send another patch to
clean up it on the top of this patchset soon.
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