From 340887809d92a4dd6c71caa97d658cef32c098c3 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Tue, 12 Jun 2007 11:36:58 -0400 Subject: Btrfs: i386 fixes from axboe Signed-off-by: Chris Mason --- fs/btrfs/INSTALL | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 fs/btrfs/INSTALL (limited to 'fs/btrfs/INSTALL') diff --git a/fs/btrfs/INSTALL b/fs/btrfs/INSTALL new file mode 100644 index 000000000000..e83ff6e8c8d5 --- /dev/null +++ b/fs/btrfs/INSTALL @@ -0,0 +1,51 @@ +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 the crypto manager interface in the kernel for file and +metadata checksums. You need to compile the kernel with: + +CONFIG_CRYPTO=y +CONFIG_CRYPTO_MANAGER=m +CONFIG_CRYPTO_CRC32C=m + +cryptomanager and crc32c 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 crc32c +modprobe cryptomgr +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. + +debug-tree: print all of the FS metadata in text form. Example: + + debug-tree /dev/sda2 >& big_output_file + -- cgit v1.2.3 From 22bb92f376b38154dc0c3688a01a16525b4caab0 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Fri, 22 Jun 2007 14:49:31 -0400 Subject: Btrfs: Documentation update Signed-off-by: Chris Mason --- fs/btrfs/INSTALL | 17 +++++++---------- fs/btrfs/root-tree.c | 2 -- fs/btrfs/transaction.c | 1 - 3 files changed, 7 insertions(+), 13 deletions(-) (limited to 'fs/btrfs/INSTALL') diff --git a/fs/btrfs/INSTALL b/fs/btrfs/INSTALL index e83ff6e8c8d5..16b45a56878d 100644 --- a/fs/btrfs/INSTALL +++ b/fs/btrfs/INSTALL @@ -5,19 +5,16 @@ 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 the crypto manager interface in the kernel for file and -metadata checksums. You need to compile the kernel with: +Btrfs uses libcrc32c in the kernel for file and metadata checksums. You need +to compile the kernel with: -CONFIG_CRYPTO=y -CONFIG_CRYPTO_MANAGER=m -CONFIG_CRYPTO_CRC32C=m +CONFIG_LIBCRC32C=m -cryptomanager and crc32c 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: +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 crc32c -modprobe cryptomgr +modprobe libcrc32c insmod btrfs.ko The Btrfs utility programs require libuuid to build. This can be found diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index 737e5a38d17e..8b0eca042ea4 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -51,7 +51,6 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, memcpy(item, btrfs_item_ptr(l, slot, struct btrfs_root_item), sizeof(*item)); btrfs_disk_key_to_cpu(key, &l->items[slot].key); -printk("find last finds key %Lu %u %Lu slot %d search for obj %Lu\n", key->objectid, key->flags, key->offset, slot, objectid); ret = 0; out: btrfs_release_path(root, path); @@ -141,7 +140,6 @@ int btrfs_find_dead_roots(struct btrfs_root *root) ret = PTR_ERR(root); goto err; } -printk("found dead root %Lu %u %Lu\n", key.objectid, key.flags, key.offset); ret = btrfs_add_dead_root(dead_root, &root->fs_info->dead_roots); if (ret) diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 85a2a5e27148..a5a63d471e43 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -308,7 +308,6 @@ static int drop_dirty_roots(struct btrfs_root *tree_root, list_del_init(&dirty->list); trans = btrfs_start_transaction(tree_root, 1); -printk("deleting root %Lu %u %Lu\n", dirty->snap_key.objectid, dirty->snap_key.flags, dirty->snap_key.offset); ret = btrfs_drop_snapshot(trans, dirty->root, dirty->commit_root); BUG_ON(ret); -- cgit v1.2.3