linux-kernel - Re: Disk geometry from /sys

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Message-ID: <47FE703D.5030901@rtr.ca>
Date:	Thu, 10 Apr 2008 15:53:33 -0400
From:	Mark Lord <lkml@....ca>
To:	Francis Moreau <francis.moro@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Disk geometry from /sys

Francis Moreau wrote:
> Hi
> 
> On Wed, Apr 9, 2008 at 11:57 PM, Mark Lord <lkml@....ca> wrote:
>>> 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)
>>>
>>  $ DEV=/dev/sda
>>  $ GEOM="`/sbin/hdparm -g $DEV | awk '{print $3}'`"
>>  $ echo $GEOM
>>  19457/255/63
>>  $
>>
> 
> Sure and you could the same with fdisk, sfdisk, parted outputs...
> 
> But that wasn't my point, sorry if it wasn't clear.
> 
> I was actually wondering why /sys/block/sda exports a lot of disk
> features but the disk geometry. I was wondering if somthing like
> 
> /sys/block/sda/geometry/heads
> 
> could be useful...
..

Probably not for going forward.  Except when partitioning,
the CHS info isn't really useful or needed for anything newer
than about 14 years old.

And there's already an ioctl for getting it.

So we could add more /sysfs bloat for it, I suppose, but..
 

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