linux-kernel - Re: fs/bio.c - Hardcoded sector size ?

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Date:	Fri, 29 Sep 2006 13:17:30 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Roger Gammans <roger@...puter-surgery.co.uk>
Cc:	lkml <linux-kernel@...r.kernel.org>, axboe@...nel.dk
Subject: Re: fs/bio.c - Hardcoded sector size ?

On Thu, 28 Sep 2006 20:56:27 +0100 Roger Gammans wrote:

> On Fri, Sep 29, 2006 at 12:37:37PM -0700, Randy Dunlap wrote:
> > Hm, I looked thru fs/bio.c and block/*.c and Documentation/Docbook/*.tmpl.
> > The best place that I see to put it right now is in
> > include/linux/bio.h, struct bio, field: bi_sector.
> > 
> > What do you think of that?
> 
> Well, ... Um. I can't think of anywhere better either, so how about
> this:-
> 
> Signed-Off-By: Roger Gammans <rgammans@...puter-sugery.co.uk>


Looks OK to me.  I would probably go for something a little
stronger, though, like:

	sector_t		bi_sector;	/* block layer sector
						 * addresses are always in
						 * 512-byte units in Linux */

Jens, is something like this (above or below) OK with you?


> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 76bdaea..77a8e6b 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -70,7 +70,8 @@ typedef void (bio_destructor_t) (struct
>   * stacking drivers)
>   */
>  struct bio {
> -       sector_t                bi_sector;
> +       sector_t                bi_sector;      /* device address in 512 byte
> +                                                  sectors */
>         struct bio              *bi_next;       /* request queue link */
>         struct block_device     *bi_bdev;
>         unsigned long           bi_flags;       /* status, command, etc
> */


---
~Randy
-
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