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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20100816155516.GD11907@agk-dp.fab.redhat.com>
Date:	Mon, 16 Aug 2010 16:55:16 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	Jeff Chua <jeff.chua.linux@...il.com>
Cc:	Zdenek Kabelac <zkabelac@...hat.com>,
	device-mapper development <dm-devel@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>, lvm-devel@...hat.com
Subject: Re: [dm-devel] [lvm-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 11:32:15PM +0800, Jeff Chua wrote:
> It'll be nice if lvm returns a more meanful message like "ioctl
> failed. Check /proc/misc to ensure the device is mapped correctly."
 
No need - LVM should be quite capable of detecting/dealing with the problem.

> 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/:/ }

The whole point of this change was to trigger the loading of dm-mod
automatically for people using it as a module, based on using a known
major/minor number instead of a dynamic one only known after the module
has been loaded.  That needs to happen regardless of whether someone is
using udev or not.  

This can all be fixed easily enough in userspace.

Alasdair

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/