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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Message-ID: <4C6943A0.9030708@redhat.com>
Date:	Mon, 16 Aug 2010 15:56:48 +0200
From:	Zdenek Kabelac <zkabelac@...hat.com>
To:	device-mapper development <dm-devel@...hat.com>
CC:	Jeff Chua <jeff.chua.linux@...il.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"

Dne 15.8.2010 16:13, Jeff Chua napsal(a):
> 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.
> 

Well error is usually error - so some harm under certain circumstances could
happen (low memory situation)...

But in this case I assume it's related to this kernel commit  which should fix
this problem ?

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d7824370e26325c881b665350ce64fb0a4fde24a

Zdenek
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