linux-kernel - Re: What to do about the 2TB limit on HDIO

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Message-ID: <3ae72650803271151k5a7b5c4cn5078b3bdf6a9c87a@mail.gmail.com>
Date:	Thu, 27 Mar 2008 19:51:58 +0100
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Mark Lord" <lkml@....ca>
Cc:	"Greg KH" <gregkh@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
	"Jens Axboe" <axboe@...nel.dk>, "Jeff Garzik" <jgarzik@...ox.com>,
	"Tejun Heo" <htejun@...il.com>,
	"Linus Torvalds" <torvalds@...l.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	"IDE/ATA development list" <linux-ide@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: What to do about the 2TB limit on HDIO_GETGEO ?

On Wed, Mar 26, 2008 at 1:34 AM, Mark Lord <lkml@....ca> wrote:
> Greg KH wrote:
>  > On Tue, Mar 25, 2008 at 01:37:03PM -0400, Mark Lord wrote:
>
> >> Perhaps Greg will chime in.
>  >
>  > I've been waiting to see if sanity will take hold of anyone here.
>  ..
>
>  So have we.  sysfs is a total nightmare to extract information from
>  under program / script control.  The idea presented in this thread,
>  is to have it cross-index the contents with a method that actually
>  makes it easy to access in many common scenarios, without requiring
>  huge gobs of code in user space.  Or in kernel space.
>
>  And it's not just a few 10s of lines of code currently,
>  but rather about 80-100 lines just to find the correct device subdir,
>  and *then* a few more 10s of lines of code to retrieve the value.

Hmm, 100 lines? What else do you need?

  $ grep -l 8:3 /sys/class/block/*/dev
  /sys/class/block/sdc/dev

Kay
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