This returns the index of the device, eg. /dev/sdb => 1.
Or you can think of it as the order that the device was
added, or the index of the device in guestfs_list_devices.

This also creates an internal filesystem_available function within the
daemon.

Add the new API btrfs-fsck to check the btrfs filesystem.
Btrfs is currently under heavy development, and not suitable for
any uses other than benchmarking and review. But it'll be useful
in the near future.

Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>

Add the new API btrfs-set-seeding to support the seeding-device
feature for btrfs.

Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>

Bind the easy parts of the 'btrfs' program.

The new APIs are:

btrfs-device-add: add devices to a btrfs filesystem
btrfs-device-delete: remove devices from a btrfs filesystem
btrfs-filesystem-sync: sync a btrfs filesystem
btrfs-filesystem-balance: balance a btrfs filesystem
btrfs-subvolume-create: create a btrfs snapshot
btrfs-subvolume-delete: delete a btrfs snapshot
btrfs-subvolume-list: list btrfs snapshots and subvolumes
btrfs-subvolume-set-default: set default btrfs subvolume
btrfs-subvolume-snapshot: create a writable btrfs snapshot

The new APIs are:

  get-e2attrs: List ext2 file attributes of a file.
  set-e2attrs: Set or clear ext2 file attributes of a file.
  get-e2generation: Get ext2 file generation of a file.
  set-e2generation: Set ext2 file generation of a file.

These are implemented using the lsattr and chattr programs from
e2fsprogs.

This allows all parameters from btrfs to be accessed.

This returns information about the underlying devices of an MD
(software RAID) device.