Btrfs: create UUID tree if required
This tree is not created by mkfs.btrfs. Therefore when a filesystem is mounted writable and the UUID tree does not exist, this tree is created if required. The tree is also added to the fs_info structure and initialized, but this commit does not yet read or write UUID tree elements. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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