Commit 22bb92f3 authored by Chris Mason's avatar Chris Mason Committed by David Woodhouse

Btrfs: Documentation update

Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 5eda7b5e
...@@ -5,19 +5,16 @@ directory can only be changed by btrfsctl right now, and normal filesystem ...@@ -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', operations do not work on it. The default subvolume is called 'default',
and you can create files and directories in mount_point/default and you can create files and directories in mount_point/default
Btrfs uses the crypto manager interface in the kernel for file and Btrfs uses libcrc32c in the kernel for file and metadata checksums. You need
metadata checksums. You need to compile the kernel with: to compile the kernel with:
CONFIG_CRYPTO=y CONFIG_LIBCRC32C=m
CONFIG_CRYPTO_MANAGER=m
CONFIG_CRYPTO_CRC32C=m
cryptomanager and crc32c can be static as well. Once your kernel is libcrc32c can be static as well. Once your kernel is setup, typing make in the
setup, typing make in the btrfs module sources will build against the btrfs module sources will build against the running kernel. When the build is
running kernel. When the build is complete: complete:
modprobe crc32c modprobe libcrc32c
modprobe cryptomgr
insmod btrfs.ko insmod btrfs.ko
The Btrfs utility programs require libuuid to build. This can be found The Btrfs utility programs require libuuid to build. This can be found
......
...@@ -51,7 +51,6 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, ...@@ -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), memcpy(item, btrfs_item_ptr(l, slot, struct btrfs_root_item),
sizeof(*item)); sizeof(*item));
btrfs_disk_key_to_cpu(key, &l->items[slot].key); 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; ret = 0;
out: out:
btrfs_release_path(root, path); btrfs_release_path(root, path);
...@@ -141,7 +140,6 @@ int btrfs_find_dead_roots(struct btrfs_root *root) ...@@ -141,7 +140,6 @@ int btrfs_find_dead_roots(struct btrfs_root *root)
ret = PTR_ERR(root); ret = PTR_ERR(root);
goto err; goto err;
} }
printk("found dead root %Lu %u %Lu\n", key.objectid, key.flags, key.offset);
ret = btrfs_add_dead_root(dead_root, ret = btrfs_add_dead_root(dead_root,
&root->fs_info->dead_roots); &root->fs_info->dead_roots);
if (ret) if (ret)
......
...@@ -308,7 +308,6 @@ static int drop_dirty_roots(struct btrfs_root *tree_root, ...@@ -308,7 +308,6 @@ static int drop_dirty_roots(struct btrfs_root *tree_root,
list_del_init(&dirty->list); list_del_init(&dirty->list);
trans = btrfs_start_transaction(tree_root, 1); 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, ret = btrfs_drop_snapshot(trans, dirty->root,
dirty->commit_root); dirty->commit_root);
BUG_ON(ret); BUG_ON(ret);
......
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