linux-kernel - Re: Disk geometry from /sys

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Date:	Wed, 23 Apr 2008 11:33:44 +0200
From:	Seewer Philippe <philippe.seewer@....ch>
To:	Francis Moreau <francis.moro@...il.com>
CC:	Mark Lord <lkml@....ca>, linux-kernel@...r.kernel.org
Subject: Re: Disk geometry from /sys


Francis Moreau wrote:
[snip]
> If I'd like to take a look in the kernel code to see where the kernel
> translates an offset
> provided by sys_read into a LBA or CHS address, where should I go ?
> drivers/block ?
No just /block

from Documentation/block/biodoc.txt

[quote]
Drivers no longer have to map a {partition, sector offset} into the
correct absolute location anymore, this is done by the block layer, so
where a driver received a request ala this before:

         rq->rq_dev = mk_kdev(3, 5);     /* /dev/hda5 */
         rq->sector = 0;                 /* first sector on hda5 */

   it will now see

         rq->rq_dev = mk_kdev(3, 0);     /* /dev/hda */
         rq->sector = 123128;            /* offset from start of disk */
[/quote]


/drivers/block is block-device drivers not the block layer itself.
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