diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 25ce079..1849a99 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -28,15 +28,15 @@
 {
 	struct list_head *node, *next;
 	struct btrfs_buffer *b;
-	if (root->cache_size < cache_max)
+	if (root->fs_info->cache_size < cache_max)
 		return 0;
-	list_for_each_safe(node, next, &root->cache) {
+	list_for_each_safe(node, next, &root->fs_info->cache) {
 		b = list_entry(node, struct btrfs_buffer, cache);
 		if (b->count == 1) {
 			BUG_ON(!list_empty(&b->dirty));
 			list_del_init(&b->cache);
 			btrfs_block_release(root, b);
-			if (root->cache_size < cache_max)
+			if (root->fs_info->cache_size < cache_max)
 				break;
 		}
 	}
@@ -57,10 +57,10 @@
 	INIT_LIST_HEAD(&buf->dirty);
 	free_some_buffers(root);
 	radix_tree_preload(GFP_KERNEL);
-	ret = radix_tree_insert(&root->cache_radix, blocknr, buf);
+	ret = radix_tree_insert(&root->fs_info->cache_radix, blocknr, buf);
 	radix_tree_preload_end();
-	list_add_tail(&buf->cache, &root->cache);
-	root->cache_size++;
+	list_add_tail(&buf->cache, &root->fs_info->cache);
+	root->fs_info->cache_size++;
 	if (ret) {
 		free(buf);
 		return NULL;
@@ -71,7 +71,7 @@
 struct btrfs_buffer *find_tree_block(struct btrfs_root *root, u64 blocknr)
 {
 	struct btrfs_buffer *buf;
-	buf = radix_tree_lookup(&root->cache_radix, blocknr);
+	buf = radix_tree_lookup(&root->fs_info->cache_radix, blocknr);
 	if (buf) {
 		buf->count++;
 	} else {
@@ -90,14 +90,15 @@
 	struct btrfs_buffer *buf;
 	int ret;
 
-	buf = radix_tree_lookup(&root->cache_radix, blocknr);
+	buf = radix_tree_lookup(&root->fs_info->cache_radix, blocknr);
 	if (buf) {
 		buf->count++;
 	} else {
 		buf = alloc_tree_block(root, blocknr);
 		if (!buf)
 			return NULL;
-		ret = pread(root->fp, &buf->node, root->blocksize, offset);
+		ret = pread(root->fs_info->fp, &buf->node, root->blocksize,
+			    offset);
 		if (ret != root->blocksize) {
 			free(buf);
 			return NULL;
@@ -113,7 +114,7 @@
 {
 	if (!list_empty(&buf->dirty))
 		return 0;
-	list_add_tail(&buf->dirty, &root->trans);
+	list_add_tail(&buf->dirty, &root->fs_info->trans);
 	buf->count++;
 	return 0;
 }
@@ -137,7 +138,7 @@
 
 	if (buf->blocknr != btrfs_header_blocknr(&buf->node.header))
 		BUG();
-	ret = pwrite(root->fp, &buf->node, root->blocksize, offset);
+	ret = pwrite(root->fs_info->fp, &buf->node, root->blocksize, offset);
 	if (ret != root->blocksize)
 		return ret;
 	return 0;
@@ -149,8 +150,9 @@
 	struct btrfs_buffer *b;
 	int ret = 0;
 	int wret;
-	while(!list_empty(&root->trans)) {
-		b = list_entry(root->trans.next, struct btrfs_buffer, dirty);
+	while(!list_empty(&root->fs_info->trans)) {
+		b = list_entry(root->fs_info->trans.next, struct btrfs_buffer,
+			       dirty);
 		list_del_init(&b->dirty);
 		wret = write_tree_block(trans, root, b);
 		if (wret)
@@ -160,13 +162,21 @@
 	return ret;
 }
 
-static int commit_extent_and_tree_roots(struct btrfs_trans_handle *trans,
-					struct btrfs_root *tree_root, struct
-					btrfs_root *extent_root)
+static int commit_tree_roots(struct btrfs_trans_handle *trans,
+			     struct btrfs_fs_info *fs_info)
 {
 	int ret;
 	u64 old_extent_block;
+	struct btrfs_root *tree_root = fs_info->tree_root;
+	struct btrfs_root *extent_root = fs_info->extent_root;
+	struct btrfs_root *inode_root = fs_info->inode_root;
 
+	btrfs_set_root_blocknr(&inode_root->root_item,
+			       inode_root->node->blocknr);
+	ret = btrfs_update_root(trans, tree_root,
+				&inode_root->root_key,
+				&inode_root->root_item);
+	BUG_ON(ret);
 	while(1) {
 		old_extent_block = btrfs_root_blocknr(&extent_root->root_item);
 		if (old_extent_block == extent_root->node->blocknr)
@@ -178,8 +188,6 @@
 					&extent_root->root_item);
 		BUG_ON(ret);
 	}
-	__commit_transaction(trans, extent_root);
-	__commit_transaction(trans, tree_root);
 	return 0;
 }
 
@@ -190,9 +198,6 @@
 	struct btrfs_buffer *snap = root->commit_root;
 	struct btrfs_key snap_key;
 
-	ret = __commit_transaction(trans, root);
-	BUG_ON(ret);
-
 	if (root->commit_root == root->node)
 		return 0;
 
@@ -200,54 +205,55 @@
 	root->root_key.offset++;
 
 	btrfs_set_root_blocknr(&root->root_item, root->node->blocknr);
-	ret = btrfs_insert_root(trans, root->tree_root, &root->root_key,
-				&root->root_item);
+	ret = btrfs_insert_root(trans, root->fs_info->tree_root,
+				&root->root_key, &root->root_item);
 	BUG_ON(ret);
 
-	ret = commit_extent_and_tree_roots(trans, root->tree_root,
-					   root->extent_root);
+	ret = commit_tree_roots(trans, root->fs_info);
+	BUG_ON(ret);
+
+	ret = __commit_transaction(trans, root);
 	BUG_ON(ret);
 
 	write_ctree_super(trans, root, s);
-	btrfs_finish_extent_commit(trans, root->extent_root);
-	btrfs_finish_extent_commit(trans, root->tree_root);
+	btrfs_finish_extent_commit(trans, root->fs_info->extent_root);
+	btrfs_finish_extent_commit(trans, root->fs_info->tree_root);
 
 	root->commit_root = root->node;
 	root->node->count++;
 	ret = btrfs_drop_snapshot(trans, root, snap);
 	BUG_ON(ret);
 
-	ret = btrfs_del_root(trans, root->tree_root, &snap_key);
+	ret = btrfs_del_root(trans, root->fs_info->tree_root, &snap_key);
 	BUG_ON(ret);
 
 	return ret;
 }
 
 static int __setup_root(struct btrfs_super_block *super,
-			struct btrfs_root *root, u64 objectid, int fp)
+			struct btrfs_root *root,
+			struct btrfs_fs_info *fs_info,
+			u64 objectid, int fp)
 {
-	INIT_LIST_HEAD(&root->trans);
-	INIT_LIST_HEAD(&root->cache);
-	root->cache_size = 0;
-	root->fp = fp;
 	root->node = NULL;
 	root->commit_root = NULL;
 	root->blocksize = btrfs_super_blocksize(super);
 	root->ref_cows = 0;
-	memset(&root->current_insert, 0, sizeof(root->current_insert));
-	memset(&root->last_insert, 0, sizeof(root->last_insert));
+	root->fs_info = fs_info;
 	memset(&root->root_key, 0, sizeof(root->root_key));
 	memset(&root->root_item, 0, sizeof(root->root_item));
 	return 0;
 }
 
 static int find_and_setup_root(struct btrfs_super_block *super,
-			       struct btrfs_root *tree_root, u64 objectid,
+			       struct btrfs_root *tree_root,
+			       struct btrfs_fs_info *fs_info,
+			       u64 objectid,
 			       struct btrfs_root *root, int fp)
 {
 	int ret;
 
-	__setup_root(super, root, objectid, fp);
+	__setup_root(super, root, fs_info, objectid, fp);
 	ret = btrfs_find_last_root(tree_root, objectid,
 				   &root->root_item, &root->root_key);
 	BUG_ON(ret);
@@ -263,29 +269,31 @@
 	struct btrfs_root *root = malloc(sizeof(struct btrfs_root));
 	struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
 	struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
+	struct btrfs_root *inode_root = malloc(sizeof(struct btrfs_root));
+	struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
 	int fp;
 	int ret;
 
-	root->extent_root = extent_root;
-	root->tree_root = tree_root;
-
-	extent_root->extent_root = extent_root;
-	extent_root->tree_root = tree_root;
-
-	tree_root->extent_root = extent_root;
-	tree_root->tree_root = tree_root;
-
 	fp = open(filename, O_CREAT | O_RDWR, 0600);
 	if (fp < 0) {
 		free(root);
 		return NULL;
 	}
-	INIT_RADIX_TREE(&root->cache_radix, GFP_KERNEL);
-	INIT_RADIX_TREE(&root->pinned_radix, GFP_KERNEL);
-	INIT_RADIX_TREE(&extent_root->pinned_radix, GFP_KERNEL);
-	INIT_RADIX_TREE(&extent_root->cache_radix, GFP_KERNEL);
-	INIT_RADIX_TREE(&tree_root->pinned_radix, GFP_KERNEL);
-	INIT_RADIX_TREE(&tree_root->cache_radix, GFP_KERNEL);
+	INIT_RADIX_TREE(&fs_info->cache_radix, GFP_KERNEL);
+	INIT_RADIX_TREE(&fs_info->pinned_radix, GFP_KERNEL);
+	INIT_LIST_HEAD(&fs_info->trans);
+	INIT_LIST_HEAD(&fs_info->cache);
+	fs_info->cache_size = 0;
+	fs_info->fp = fp;
+	fs_info->running_transaction = NULL;
+	fs_info->fs_root = root;
+	fs_info->tree_root = tree_root;
+	fs_info->extent_root = extent_root;
+	fs_info->inode_root = inode_root;
+	fs_info->last_inode_alloc = 0;
+	fs_info->last_inode_alloc_dirid = 0;
+	memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert));
+	memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert));
 
 	ret = pread(fp, super, sizeof(struct btrfs_super_block),
 		     BTRFS_SUPER_INFO_OFFSET);
@@ -301,16 +309,20 @@
 	}
 	BUG_ON(ret < 0);
 
-	__setup_root(super, tree_root, BTRFS_ROOT_TREE_OBJECTID, fp);
+	__setup_root(super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID, fp);
 	tree_root->node = read_tree_block(tree_root, btrfs_super_root(super));
 	BUG_ON(!tree_root->node);
 
-	ret = find_and_setup_root(super, tree_root, BTRFS_EXTENT_TREE_OBJECTID,
-				  extent_root, fp);
+	ret = find_and_setup_root(super, tree_root, fs_info,
+				  BTRFS_EXTENT_TREE_OBJECTID, extent_root, fp);
 	BUG_ON(ret);
 
-	ret = find_and_setup_root(super, tree_root, BTRFS_FS_TREE_OBJECTID,
-				  root, fp);
+	ret = find_and_setup_root(super, tree_root, fs_info,
+				  BTRFS_INODE_MAP_OBJECTID, inode_root, fp);
+	BUG_ON(ret);
+
+	ret = find_and_setup_root(super, tree_root, fs_info,
+				  BTRFS_FS_TREE_OBJECTID, root, fp);
 	BUG_ON(ret);
 
 	root->commit_root = root->node;
@@ -323,8 +335,8 @@
 		      *root, struct btrfs_super_block *s)
 {
 	int ret;
-	btrfs_set_super_root(s, root->tree_root->node->blocknr);
-	ret = pwrite(root->fp, s, sizeof(*s),
+	btrfs_set_super_root(s, root->fs_info->tree_root->node->blocknr);
+	ret = pwrite(root->fs_info->fp, s, sizeof(*s),
 		     BTRFS_SUPER_INFO_OFFSET);
 	if (ret != sizeof(*s)) {
 		fprintf(stderr, "failed to write new super block err %d\n", ret);
@@ -335,9 +347,10 @@
 
 static int drop_cache(struct btrfs_root *root)
 {
-	while(!list_empty(&root->cache)) {
-		struct btrfs_buffer *b = list_entry(root->cache.next,
-						   struct btrfs_buffer, cache);
+	while(!list_empty(&root->fs_info->cache)) {
+		struct btrfs_buffer *b = list_entry(root->fs_info->cache.next,
+						    struct btrfs_buffer,
+						    cache);
 		list_del_init(&b->cache);
 		btrfs_block_release(root, b);
 	}
@@ -348,26 +361,28 @@
 	int ret;
 	struct btrfs_trans_handle *trans;
 
-	trans = root->running_transaction;
+	trans = root->fs_info->running_transaction;
 	btrfs_commit_transaction(trans, root, s);
-	ret = commit_extent_and_tree_roots(trans, root->tree_root,
-					   root->extent_root);
+	ret = commit_tree_roots(trans, root->fs_info);
+	BUG_ON(ret);
+	ret = __commit_transaction(trans, root);
 	BUG_ON(ret);
 	write_ctree_super(trans, root, s);
-	drop_cache(root->extent_root);
-	drop_cache(root->tree_root);
 	drop_cache(root);
-	BUG_ON(!list_empty(&root->trans));
-	BUG_ON(!list_empty(&root->extent_root->trans));
-	BUG_ON(!list_empty(&root->tree_root->trans));
+	BUG_ON(!list_empty(&root->fs_info->trans));
 
-	close(root->fp);
+	close(root->fs_info->fp);
 	if (root->node)
 		btrfs_block_release(root, root->node);
-	if (root->extent_root->node)
-		btrfs_block_release(root->extent_root, root->extent_root->node);
-	if (root->tree_root->node)
-		btrfs_block_release(root->tree_root, root->tree_root->node);
+	if (root->fs_info->extent_root->node)
+		btrfs_block_release(root->fs_info->extent_root,
+				    root->fs_info->extent_root->node);
+	if (root->fs_info->inode_root->node)
+		btrfs_block_release(root->fs_info->inode_root,
+				    root->fs_info->inode_root->node);
+	if (root->fs_info->tree_root->node)
+		btrfs_block_release(root->fs_info->tree_root,
+				    root->fs_info->tree_root->node);
 	btrfs_block_release(root, root->commit_root);
 	free(root);
 	printf("on close %d blocks are allocated\n", allocated_blocks);
@@ -382,15 +397,16 @@
 	if (buf->count == 0) {
 		BUG_ON(!list_empty(&buf->cache));
 		BUG_ON(!list_empty(&buf->dirty));
-		if (!radix_tree_lookup(&root->cache_radix, buf->blocknr))
+		if (!radix_tree_lookup(&root->fs_info->cache_radix,
+				       buf->blocknr))
 			BUG();
-		radix_tree_delete(&root->cache_radix, buf->blocknr);
+		radix_tree_delete(&root->fs_info->cache_radix, buf->blocknr);
 		memset(buf, 0, sizeof(*buf));
 		free(buf);
 		BUG_ON(allocated_blocks == 0);
 		allocated_blocks--;
-		BUG_ON(root->cache_size == 0);
-		root->cache_size--;
+		BUG_ON(root->fs_info->cache_size == 0);
+		root->fs_info->cache_size--;
 	}
 }