Install Instructions

Btrfs uses libcrc32c in the kernel for file and metadata checksums.  You need
to compile the kernel with:

CONFIG_LIBCRC32C=m

libcrc32c can be static as well.  Once your kernel is setup, typing make in the
btrfs module sources will build against the running kernel.  When the build is
complete:

modprobe libcrc32c
insmod btrfs.ko

The Btrfs utility programs require the following libraries/tools to build:

- libuuid (This can be found in the e2fsprogs sources, and is usually available
  as libuuid or e2fsprogs-devel from various distros).
- libattr (Extended attribute library - Development files)
- libblkid (Block device id library - Development files)
- liblzo2 (LZO data compression library - Development files)
- libacl (Access control list library - Development files)
- e2fslibs (ext2/ext3/ext4 file system libraries - Development files)
- asciidoc (Text document format tool - For documentation)

Building the utilities is just make ; make install.  The programs go
into /usr/local/bin.  The mains commands available are:

mkfs.btrfs: create a filesystem

btrfs: control program to create snapshots and subvolumes:
	# mount a btrfs filesystem
	mount /dev/sda2 /mnt

	# create a subvolume
	btrfs subvolume create /mnt/new_subvol_name

	# snapshot of a subvolume
	btrfs subvolume snapshot /mnt/default /mnt/snapshot_of_default 
	btrfs subvolume snapshot /mnt/snapshot_of_default \
		/mnt/snapshot_of_a_snapshot

	# list of the subvolumes
	ls /mnt
	default snapshot_of_a_snapshot snapshot_of_new_subvol
	new_subvol_name snapshot_of_default

	# removal of a subvolume or a snapshot
	btrfs subvolume delete /mn/snapshot_of_a_snapshot

	# look a the btrfs man page for further information
	man btrfs

btrfsck: do a limited check of the FS extent trees.</li>

btrfs-debug-tree: print all of the FS metadata in text form.  Example:

	btrfs-debug-tree /dev/sda2 >& big_output_file