[linux-lvm] how to determine if /dev/... is an LV?
josv at osp.nl
josv at osp.nl
Wed Aug 22 14:49:36 UTC 2001
Well,
You could always check the major number of the device file with
the one in /proc/devices, and see whether it is the major number
of the lvm driver. Then check whether the minor number is that
of a valid logical volume (not 0).
++Jos
And thus it came to pass that Brian J. Murrell wrote:
(on Wed, Aug 22, 2001 at 03:44:25AM -0400 to be exact)
> Hi all,
>
> This should hopefully be simple. I am modifying some code to deal
> with LVM. If I am given a device path for an LV, say, /dev/VG/1,
> programatically, how can I determine that it actually is an LV and not
> some other kind of device? The best I have come up with is:
>
> lvdisplay -D -c /dev/VG/lvol1 2>&1 | grep "^/dev/VG/lvol1" >/dev/null
>
> and testing "$?".
>
> Seems kind of "hacky" though. Is there a better way?
>
> Also, is there any relationship between the output from the lvdisplay
> and the minor number for the device?
>
> Thanx,
> b.
>
> --
> Brian J. Murrell
>
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> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
--
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