linux-kernel - Re: [PATCH 1/9] lguest: block device speedup

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Date:	Fri, 9 Mar 2007 07:51:23 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@....de>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH 1/9] lguest: block device speedup

On Fri, Mar 09, 2007 at 02:05:24PM +1100, Rusty Russell wrote:
> diff -r fdc8cbc1fd61 drivers/block/lguest_blk.c
> --- a/drivers/block/lguest_blk.c	Thu Mar 08 13:35:39 2007 +1100
> +++ b/drivers/block/lguest_blk.c	Thu Mar 08 15:51:55 2007 +1100
> @@ -45,6 +45,16 @@ struct blockdev
>  	struct request *req;
>  };
>  
> +/* Jens gave me this nice helper to end all chunks of a request. */
> +static void end_entire_request(struct request *req, int uptodate)
> +{
> +	if (end_that_request_first(req, uptodate, req->hard_nr_sectors))
> +		BUG();
> +	add_disk_randomness(req->rq_disk);
> +	blkdev_dequeue_request(req);
> +	end_that_request_last(req, uptodate);
> +}

I think we really want this in common code, ll_rw_blk.c should have:

static int __end_request(struct request *req, int uptodate,
		unsigned int sectors)
{
        if (!end_that_request_first(req, uptodate, sectors)) {
		add_disk_randomness(req->rq_disk);
		blkdev_dequeue_request(req);
		end_that_request_last(req, uptodate);
		return 1;
	}
	return 0;
}

/* TODO: add kerneldoc comment */
/* XXX: should be called end_partial_request */
void end_request(struct request *req, int uptodate)
{
	__end_request(req, uptodate, req->hard_cur_sectors);
}

/* TODO: add kerneldoc comment */
void end_entired_request(struct request *req, int uptodate)
{
	if (!__end_request(req, uptodate, req->hard_nr_sectors))
		BUG();
}

the latter two maybe as inlines
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