linux-kernel - Re: [PATCH 12/30] blk_end_request: changing ub (take 4)

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Message-Id: <20071211154803.58beb681.zaitcev@redhat.com>
Date:	Tue, 11 Dec 2007 15:48:03 -0800
From:	Pete Zaitcev <zaitcev@...hat.com>
To:	Kiyoshi Ueda <k-ueda@...jp.nec.com>
Cc:	jens.axboe@...cle.com, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	dm-devel@...hat.com, j-nomura@...jp.nec.com, zaitcev@...hat.com
Subject: Re: [PATCH 12/30] blk_end_request: changing ub (take 4)

On Tue, 11 Dec 2007 17:46:47 -0500 (EST), Kiyoshi Ueda <k-ueda@...jp.nec.com> wrote:

>  	if (scsi_status == 0) {
> -		uptodate = 1;
> +		error = 0;
>  	} else {
> -		uptodate = 0;
> +		error = -EIO;
>  		rq->errors = scsi_status;
>  	}
> -	end_that_request_first(rq, uptodate, rq->hard_nr_sectors);
> -	end_that_request_last(rq, uptodate);
> +	if (__blk_end_request(rq, error, blk_rq_bytes(rq)))
> +		BUG();

Acked-by: Pete Zaitcev <zaitcev@...hat.com>

I follow the discussion, actually, and wanted to ask someone to look
closer if it's appropriate to use __blk_end_request() here.
My understanding was, blk_end_request() is the same thing, only
takes the queue lock. But then, should I refactor ub so that it
calls __blk_end_request if request function ends with an error
and blk_end_request if the end-of-IO even is processed? If not,
and the above is sufficient, why have blk_end_request at all?

-- Pete
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