Problem with renaming devices

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   There seems to be some issue over changing the names of the device
that a btrfs filesystem lives on:

# lvcreate scratch -n fstest -L 2G
  Logical volume "fstest" created
# mkfs -t btrfs /dev/scratch/fstest

WARNING! - Btrfs v0.18-ge3b0f66 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using

fs created label (null) on /dev/scratch/fs1
	nodesize 4096 leafsize 4096 sectorsize 4096 size 2.00GB
Btrfs v0.18-ge3b0f66

# mount /dev/scratch/fstest /mnt
# umount /mnt

# lvrename scratch fstest derek
  Renamed "fstest" to "derek" in volume group "scratch"
# mount /dev/scratch/derek /mnt
mount: /dev/mapper/scratch-derek: can't read superblock

# lvrename scratch derek fstest
  Renamed "derek" to "fstest" in volume group "scratch"
# mount /dev/scratch/fstest /mnt
[success]

   The rename works properly on a completely virgin filesystem, but
not on one that's been mounted and unmounted (as above).

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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             --- Happiness is mandatory.  Are you happy? ---             

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