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Diffstat (limited to 'fs/btrfs/INSTALL')
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diff --git a/fs/btrfs/INSTALL b/fs/btrfs/INSTALL new file mode 100644 index 0000000..16b45a5 --- /dev/null +++ b/fs/btrfs/INSTALL @@ -0,0 +1,48 @@ +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 + |
