does not recognize btrfs

[Chris Murphy]

An unpartitioned but xfs formatted LUN is recognized as xfs. But a LUN 
formatted as btrfs isn't recognized. It does mount correctly as btrfs, but 
parted says it's unrecognized. Is this expected?

parted-3.1-12.fc19.x86_64


# parted -l

Model: Virtio Block Device (virtblk)
Disk /dev/vdb: 17.6TB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags: 

Number  Start  End     Size    File system  Flags
 1      0.00B  17.6TB  17.6TB  xfs



Error: /dev/vdc: unrecognised disk label
Model: Virtio Block Device (virtblk)                                      
Disk /dev/vdc: 17.6TB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags: 

# mount | grep vdc
/dev/vdc on /mnt type btrfs (rw,relatime,seclabel,space_cache)


Chris Murphy