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- Install Instructions
- Btrfs puts snapshots and subvolumes into the root directory of the FS. This
- directory can only be changed by btrfsctl right now, and normal filesystem
- operations do not work on it. The default subvolume is called 'default',
- and you can create files and directories in mount_point/default
- 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 libuuid to build. This can be found
- in the e2fsprogs sources, and is usually available as libuuid or
- e2fsprogs-devel from various distros.
- Building the utilities is just make ; make install. The programs go
- into /usr/local/bin. The commands available are:
- mkfs.btrfs: create a filesystem
- btrfsctl: control program to create snapshots and subvolumes:
- mount /dev/sda2 /mnt
- btrfsctl -s new_subvol_name /mnt
- btrfsctl -s snapshot_of_default /mnt/default
- btrfsctl -s snapshot_of_new_subvol /mnt/new_subvol_name
- btrfsctl -s snapshot_of_a_snapshot /mnt/snapshot_of_new_subvol
- ls /mnt
- default snapshot_of_a_snapshot snapshot_of_new_subvol
- new_subvol_name snapshot_of_default
- Snapshots and subvolumes cannot be deleted right now, but you can
- rm -rf all the files and directories inside them.
- btrfsck: do a limited check of the FS extent trees.</li>
- debug-tree: print all of the FS metadata in text form. Example:
- debug-tree /dev/sda2 >& big_output_file
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