On Thu, May 13, 2010 at 10:35:47AM +0100, Pádraig Brady wrote:
> On 13/05/10 09:31, Karel Zak wrote:
> >
> > The blklimits program is the command-line interface to working with
> > I/O topology support in the libblkid library. For example:
> >
> > # blklimits /dev/sdb
> > alignment offset: 0
> > minimum io size: 4096
> > optimal io size: 32768
> > logical sector size: 512
> > physical sector size: 4096
>
> Could you mention why you chose to have a separate command
> rather than adding extra options to `blockdev`?
Good point.
The blockdev already supports topology ioctls, but libblkid provides
more portable API. The ioctls are supported since kernel 2.6.32, and
the stuff is exported by /sys since 2.6.31. The libblkid is able to
read the information directly from DM, MD, LVM and EVMS on older
kernels. The library provides unified API for all these probing
methods and we need any command-line interface for this functionality
(for fdisk/parted, mkfs debugging etc.).
I'm not sure if link blockdev(8) against libblkid is a good idea.
From my point of view is blockdev(8) simple wrapper for ioctls.
(I'm not happy with another new command, so suggestions are welcomed.)
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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