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

[Ken Sharp]

** Tags added: karmic lucid

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https://bugs.launchpad.net/bugs/518638

Title:
  external btrfs partitions won't mount as different devices

Status in btrfs-tools package in Ubuntu:
  New

Bug description:
  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

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