linux-kernel - Disk geometry from /sys

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Message-ID: <38b2ab8a0804091353h3725ce29s196e27e8b4f1ff56@mail.gmail.com>
Date:	Wed, 9 Apr 2008 22:53:36 +0200
From:	"Francis Moreau" <francis.moro@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Disk geometry from /sys

Hi,

I'm trying to know the geometry of my hard disk from a bash script
and that's the reason I'm looking in /sys. The reason is that I'd like
to figure out the size of a cylinder without doing a
ioctl(bdev, HDIO_GETGEO, &geo)

Unfortunately I can't find anything useful and this is certainly a sign
that I'm doing something wrong.

Or maybe can I simply assume from my script that the geometry
is always heads=255 and the number of sectors per track is 63 for all
disks.

Looking at parted(8) source code, I  can find this:

/* The GETGEO ioctl is no longer useful (as of linux 2.6.x).  We could
 * still use it in 2.4.x, but this is contentious.  Perhaps we should
 * move to EDD. */

Could anybody give me some advices ?
-- 
Francis
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