[Bug 578742] [NEW] Btrfs device balancing does not work

[Radomír Černoch]

Public bug reported:

Binary package hint: linux-image

I am having problems adding multiple devices into a Btrfs file system in
Ubuntu 10.04 LTS.

The root FS is mounted like this:

$ mount
/dev/sdb2 on / type btrfs (rw,compress)

I have successfully added a second device into the filesystem:

$ btrfs-vol -a /dev/sda2 /

returned 0. But then the "balance chunks across all devices"

$ btrfs-vol -b /

command does not work. No output is produced and the program hangs.
Inspecting "dmesg" shows it's a kernel problem (see the enclosed log).

Nevertheless the system seems to be bootable after the error so far and
therefore I assume the filesystem has not been damaged.


System information:

$uname -a
Linux heartofgold 2.6.32-22-generic #33-Ubuntu SMP Wed Apr 28 13:28:05 UTC 2010 x86_64 GNU/Linux

$ lsb_release -rd
Description:	Ubuntu 10.04 LTS
Release:	10.04

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: btrfs kernel

-- 
Btrfs device balancing does not work
https://bugs.launchpad.net/bugs/578742
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