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authorDavid Woodhouse <dwmw2@infradead.org>2009-01-07 09:54:24 -0500
committerChris Mason <chris.mason@oracle.com>2009-01-07 09:54:24 -0500
commit709ac06a148a33493d3e2f9391bb746b067d96d6 (patch)
tree844a1228e7e4a980beb2754235297bfb0119452e
parent9ab86c8e01c3f298dba0cbf2502c635b7f6fc6f9 (diff)
Btrfs: Add Documentation/filesystem/btrfs.txt, remove old COPYING
Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--Documentation/filesystems/btrfs.txt91
-rw-r--r--fs/btrfs/COPYING356
-rw-r--r--fs/btrfs/INSTALL48
3 files changed, 91 insertions, 404 deletions
diff --git a/Documentation/filesystems/btrfs.txt b/Documentation/filesystems/btrfs.txt
new file mode 100644
index 00000000000..64087c34327
--- /dev/null
+++ b/Documentation/filesystems/btrfs.txt
@@ -0,0 +1,91 @@
+
+ BTRFS
+ =====
+
+Btrfs is a new copy on write filesystem for Linux aimed at
+implementing advanced features while focusing on fault tolerance,
+repair and easy administration. Initially developed by Oracle, Btrfs
+is licensed under the GPL and open for contribution from anyone.
+
+Linux has a wealth of filesystems to choose from, but we are facing a
+number of challenges with scaling to the large storage subsystems that
+are becoming common in today's data centers. Filesystems need to scale
+in their ability to address and manage large storage, and also in
+their ability to detect, repair and tolerate errors in the data stored
+on disk. Btrfs is under heavy development, and is not suitable for
+any uses other than benchmarking and review. The Btrfs disk format is
+not yet finalized.
+
+The main Btrfs features include:
+
+ * Extent based file storage (2^64 max file size)
+ * Space efficient packing of small files
+ * Space efficient indexed directories
+ * Dynamic inode allocation
+ * Writable snapshots
+ * Subvolumes (separate internal filesystem roots)
+ * Object level mirroring and striping
+ * Checksums on data and metadata (multiple algorithms available)
+ * Compression
+ * Integrated multiple device support, with several raid algorithms
+ * Online filesystem check (not yet implemented)
+ * Very fast offline filesystem check
+ * Efficient incremental backup and FS mirroring (not yet implemented)
+ * Online filesystem defragmentation
+
+
+
+ MAILING LIST
+ ============
+
+There is a Btrfs mailing list hosted on vger.kernel.org. You can
+find details on how to subscribe here:
+
+http://vger.kernel.org/vger-lists.html#linux-btrfs
+
+Mailing list archives are available from gmane:
+
+http://dir.gmane.org/gmane.comp.file-systems.btrfs
+
+
+
+ IRC
+ ===
+
+Discussion of Btrfs also occurs on the #btrfs channel of the Freenode
+IRC network.
+
+
+
+ UTILITIES
+ =========
+
+Userspace tools for creating and manipulating Btrfs file systems are
+available from the git repository at the following location:
+
+ http://git.kernel.org/?p=linux/kernel/git/mason/btrfs-progs-unstable.git
+ git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs-unstable.git
+
+These include the following tools:
+
+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.
+
+btrfs-debug-tree: print all of the FS metadata in text form. Example:
+
+ btrfs-debug-tree /dev/sda2 >& big_output_file
diff --git a/fs/btrfs/COPYING b/fs/btrfs/COPYING
deleted file mode 100644
index ca442d313d8..00000000000
--- a/fs/btrfs/COPYING
+++ /dev/null
@@ -1,356 +0,0 @@
-
- NOTE! This copyright does *not* cover user programs that use kernel
- services by normal system calls - this is merely considered normal use
- of the kernel, and does *not* fall under the heading of "derived work".
- Also note that the GPL below is copyrighted by the Free Software
- Foundation, but the instance of code that it refers to (the Linux
- kernel) is copyrighted by me and others who actually wrote it.
-
- Also note that the only valid version of the GPL as far as the kernel
- is concerned is _this_ particular version of the license (ie v2, not
- v2.2 or v3.x or whatever), unless explicitly otherwise stated.
-
- Linus Torvalds
-
-----------------------------------------
-
- GNU GENERAL PUBLIC LICENSE
- Version 2, June 1991
-
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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diff --git a/fs/btrfs/INSTALL b/fs/btrfs/INSTALL
deleted file mode 100644
index 16b45a56878..00000000000
--- a/fs/btrfs/INSTALL
+++ /dev/null
@@ -1,48 +0,0 @@
-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
-