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

[Alasdair G Kergon <agk redhat com>]

> 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
  cat /proc/misc

Alasdair