linux-kernel - Re: [PATCH 2/2] Add BLKPG_GET

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Date:	Thu, 08 Dec 2011 09:25:31 -0500
From:	Phillip Susi <psusi@....rr.com>
To:	Karel Zak <kzak@...hat.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Add BLKPG_GET_PARTITION operation

On 12/8/2011 7:35 AM, Karel Zak wrote:
> On Wed, Nov 30, 2011 at 10:23:44PM -0500, Phillip Susi wrote:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Add a new operation to the BLKPG ioctl to read the partition.
>> This allows user space to find the current start and length
>> of a partition without having to open the partition and use
>> the long depreciated HDIO_GETGEO ioctl.
>
>   $ cat /sys/block/sda/sda1/{size,start}
>   4096000
>   2048
>
>   ...is probably the best way if you want to avoid problems with
>   permissions and deprecated (or all) ioctls :-)

Yes, I patched parted to grab the values from sysfs and only use 
HDIO_GETGEO if that fails, but I thought an ioctl would be preferable ( 
no need to muck about with appending partition numbers to paths and 
parsing text and such ), and it seemed an orthogonal operation to the 
other BLKPG ops.

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