btrfs-tools does not handle btrfs-filesystem in 3.8 kernel

[Heiko]

I am using ubuntu 12.04.3 with the raring kernel (3.8). I used btrfs-convert to convert a ext4 partitition to btrfs. I tested the new filesystem for a while, but didn't like the performance and wanted to go back with btrfs-convert -r, but neither btrfs-convert or btrfsck where able to do anything with the filesystem.

After upgrading to
https://launchpad.net/ubuntu/quantal/i386/btrfs-tools/0.19+20120328-4
btrfs-convert -r was running nicely. Unfortunately, I lost the exact error message of the old btrfs-convert in the rollback process. It was somethink like the partition not being a btrfs-filesystem.

(Eventually related to https://bugs.launchpad.net/ubuntu/+source/btrfs-tools/+bug/894456)

Heiko

~>uname -a
Linux askeladden 3.8.0-29-generic #42~precise1-Ubuntu SMP Wed Aug 14 16:19:23 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

~>lsb_release -rd
Description: Ubuntu 12.04.3 LTS
Release: 12.04

~>apt-cache policy btrfs-tools
btrfs-tools:
  Installed: (none)
  Candidate: 0.19+20100601-3ubuntu3
  Version table:
     0.19+20100601-3ubuntu3 0