[Bug 518638] [NEW] external btrfs partitions won't mount as different devices

[Rocko]

Public bug reported:

Binary package hint: btrfs-tools

I have formatted an external drive as btrfs. The first time I mount it,
eg as /dev/sdb1, it mounts fine. But after that, it will only remount as
/dev/sdb1

The test case is:

* Mount the btrfs drive.
* Unmount and unplug the btrfs drive
* Plug another external drive in so it takes over as /dev/sdb1
* Plug the btrfs drive back in so it becomes /dev/sdc1
* Try to mount the btrfs drive.

It always fails to mount, either from nautilus or from the command line
(eg sudo mount /dev/sdc1 /some_folder). The error indicates that the
system cannot read the superblock.

If I reverse the process so that the btrfs drive once again is
/dev/sdb1, it mounts correctly, so it appears to be caching the
/dev/sdb1 information somewhere.

If I reboot so that the the second drive is /dev/sdb1 and the btrfs
drive is /dev/sdc1, the btrfs drive mounts correctly.

The same occurs if the btrfs drive is initially mounted as another
device, eg /dev/sde1; after this it will only mount as /dev/sde1.


Version info:

* I've tried on Ubuntu 9.10 with kernel 2.6.33 and btrfs-tools v
0.19-5ubuntu0.3+git20091112ubuntu1

* I've tried Ubuntu 10.04 with kernel 2.6.32 and btrfs-tools v 0.19.3

** Affects: btrfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

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external btrfs partitions won't mount as different devices
https://bugs.launchpad.net/bugs/518638
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