Btrfs: Add mount into directory support

Modified form of original patch from Christoph Hellwig to make btrfs
mount into the default subvolume by default.

mount /dev/somedevice:subvolumename to get other subvolumes or
mount /dev/somedevice:. to get the root

Signed-off-by: Chris Mason <chris.mason@oracle.com>
1 file changed
tree: 19b272d2d0558b8e6749aec7a79daff522f2cb44
  1. fs/