linux-kernel - Re: [PATCH 05/10] block: convert to pos and nr

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Date:	Wed, 29 Apr 2009 11:40:04 +0200 (CEST)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Tejun Heo <tj@...nel.org>
cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, jeff@...zik.org,
	linux-ide@...r.kernel.org, James.Bottomley@...senPartnership.com,
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	Jeff Garzik <jgarzik@...ox.com>
Subject: Re: [PATCH 05/10] block: convert to pos and nr_sectors accessors

On Wed, 29 Apr 2009, Tejun Heo wrote:
> With recent cleanups, there is no place where low level driver
> directly manipulates request fields.  This means that the 'hard'
> request fields always equal the !hard fields.  Convert all
> rq->sectors, nr_sectors and current_nr_sectors references to
> accessors.
> 
> [ Impact: use pos and nr_sectors accessors ]
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>

>  drivers/block/amiflop.c             |    6 ++--
>  drivers/block/ataflop.c             |   10 +++---
>  drivers/block/ps3disk.c             |    9 ++---
>  drivers/block/swim3.c               |   34 ++++++++++++----------
>  drivers/block/z2ram.c               |    6 ++--

Looks OK, so
Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>

> diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
> index b66ad58..d4e6b71 100644
> --- a/drivers/block/z2ram.c
> +++ b/drivers/block/z2ram.c
> @@ -71,12 +71,12 @@ static void do_z2_request(struct request_queue *q)
>  {
>  	struct request *req;
>  	while ((req = elv_next_request(q)) != NULL) {
> -		unsigned long start = req->sector << 9;
> -		unsigned long len  = req->current_nr_sectors << 9;
> +		unsigned long start = blk_rq_pos(req) << 9;
> +		unsigned long len  = blk_rq_cur_sectors(req) << 9;
                ^^^^^^^^^^^^^
I guess this one can become `unsigned int' now, as:

static inline unsigned int blk_rq_cur_sectors(struct request *rq)
{
	return blk_rq_cur_bytes(rq) >> 9;
}

and blk_rq_cur_bytes(rq) returns `int', so it must fit in an `int' anyway?

With kind regards,

Geert Uytterhoeven
Software Architect
Techsoft Centre

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