fs/btrfs/INSTALL

   1 Install Instructions
   2
   3 Btrfs puts snapshots and subvolumes into the root directory of the FS.  This
   4 directory can only be changed by btrfsctl right now, and normal filesystem
   5 operations do not work on it.  The default subvolume is called 'default',
   6 and you can create files and directories in mount_point/default
   7
   8 Btrfs uses libcrc32c in the kernel for file and metadata checksums.  You need
   9 to compile the kernel with:
  10
  11 CONFIG_LIBCRC32C=m
  12
  13 libcrc32c can be static as well.  Once your kernel is setup, typing make in the
  14 btrfs module sources will build against the running kernel.  When the build is
  15 complete:
  16
  17 modprobe libcrc32c
  18 insmod btrfs.ko
  19
  20 The Btrfs utility programs require libuuid to build.  This can be found
  21 in the e2fsprogs sources, and is usually available as libuuid or
  22 e2fsprogs-devel from various distros.
  23
  24 Building the utilities is just make ; make install.  The programs go
  25 into /usr/local/bin.  The commands available are:
  26
  27 mkfs.btrfs: create a filesystem
  28
  29 btrfsctl: control program to create snapshots and subvolumes:
  30
  31         mount /dev/sda2 /mnt
  32         btrfsctl -s new_subvol_name /mnt
  33         btrfsctl -s snapshot_of_default /mnt/default
  34         btrfsctl -s snapshot_of_new_subvol /mnt/new_subvol_name
  35         btrfsctl -s snapshot_of_a_snapshot /mnt/snapshot_of_new_subvol
  36         ls /mnt
  37         default snapshot_of_a_snapshot snapshot_of_new_subvol
  38         new_subvol_name snapshot_of_default
  39
  40         Snapshots and subvolumes cannot be deleted right now, but you can
  41         rm -rf all the files and directories inside them.
  42
  43 btrfsck: do a limited check of the FS extent trees.</li>
  44
  45 debug-tree: print all of the FS metadata in text form.  Example:
  46
  47         debug-tree /dev/sda2 >& big_output_file
  48