linux-kernel - Re: [lvm-devel] [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:	Mon, 16 Aug 2010 23:32:15 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	Zdenek Kabelac <zkabelac@...hat.com>,
	device-mapper development <dm-devel@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Jeff Chua <jeff.chua.linux@...il.com>, lvm-devel@...hat.com
Subject: Re: [lvm-devel] [dm-devel] linux-2.6.35+ causes LVM to fail with "
 device-mapper: version ioctl failed: Inappropriate ioctl for device"

On Mon, Aug 16, 2010 at 10:22 PM, Alasdair G Kergon <agk@...hat.com> wrote:
> On Mon, Aug 16, 2010 at 03:56:48PM +0200, Zdenek Kabelac wrote:
>> Dne 15.8.2010 16:13, Jeff Chua napsal(a):
>> > With 2.6.35++, /dev/mapper/control has moved from 60 to 236!
>
> The latest LVM package made an assumption that it would be set up
> correctly by udev (or manually in your case).  We are updating
> the userspace libdevmapper code to handle your circumstances
> automatically.

It'll be nice if lvm returns a more meanful message like "ioctl
failed. Check /proc/misc to ensure the device is mapped correctly."

To take care of it automatically with udev, I'm doing this in rc.S

if [ -f /sys/devices/virtual/misc/device-mapper/dev ]
then
        NODE=$(</sys/devices/virtual/misc/device-mapper/dev)
        rm -f /dev/mapper/control
        mknod /dev/mapper/control c ${NODE/:/ }
fi


>> > # 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
>
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d7824370e26325c881b665350ce64fb0a4fde24a
>
> For those interested, originally we used mlockall() but in non-C locales
> on some distributions glibc is configured to map 80MB+ of locale data
> into memory without offering any way to unmap it.  We don't need
> that data locked and it increased the minimum memory required to install
> a distribution as well as slowing down the LVM tools!  So we had to
> write a customised version that tries to skip locking unnecessary pages
> like those.

I see that now it's fixed with that commit.

Thanks,
Jeff
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