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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
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