linux-kernel - Re: [dm-devel] linux-2.6.35+ causes LVM to fail with " device-mapper: version ioctl failed: Inappropriate ioctl for device"

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Date:	Sun, 15 Aug 2010 22:13:47 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	Jeff Chua <jeff.chua.linux@...il.com>,
	device-mapper development <dm-devel@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>, lvm-devel@...hat.com
Subject: Re: [dm-devel] linux-2.6.35+ causes LVM to fail with " device-mapper:
 version ioctl failed: Inappropriate ioctl for device"

On Sun, Aug 15, 2010 at 9:03 PM, Alasdair G Kergon <agk@...hat.com> wrote:
>> Just a vanilla linux. No udev.
>
> So likely a userspace problem where udev is now assumed to be present.
>
>> > Provide long listing of /dev/mapper and any dm/lvm devices in /dev.
>
> You can do that by running:
>  ls -l /dev/mapper /dev/vg01
> Also:
>  cat /proc/devices

253 device-mapper

>  cat /proc/misc

236 device-mapper <== was at 60 before the new kernel


Got it! Sorry, it's me being _dumb_!!!

With 2.6.35++, /dev/mapper/control has moved from 60 to 236!

So I fix it by recreating the control file with "mknod
/var/mapper/control c 10 253".

I got this "internal error" when I activate/deactivate the volume
group, but it seems ok. I could mount the volumes and so far it's all
good.

# vgchange -a n vg01
  Internal error: Maps lock 14217216 < unlock 14221312
  Internal error: Maps lock 14221312 < unlock 14225408
  Internal error: Maps lock 14225408 < unlock 14229504
  Internal error: Maps lock 14229504 < unlock 14233600
  Internal error: Maps lock 14233600 < unlock 14237696
  Internal error: Maps lock 14237696 < unlock 14241792
  0 logical volume(s) in volume group "vg01" now active

# vgchange -a y vg01
  Internal error: Maps lock 14192640 < unlock 14196736
  Internal error: Maps lock 14196736 < unlock 14200832
  Internal error: Maps lock 14200832 < unlock 14204928
  Internal error: Maps lock 14204928 < unlock 14209024
  Internal error: Maps lock 14209024 < unlock 14213120
  Internal error: Maps lock 14213120 < unlock 14217216
  6 logical volume(s) in volume group "vg01" now active

Hopefully those errors above means no harm.

Thanks,
Jeff
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