static int fill_dummy_bgs(struct btrfs_fs_info *fs_info)
{
	struct extent_map_tree *em_tree = &fs_info->mapping_tree;
	struct btrfs_space_info *space_info;
	struct rb_node *node;
	int ret = 0;

	for (node = rb_first_cached(&em_tree->map); node; node = rb_next(node)) {
		struct extent_map *em;
		struct map_lookup *map;
		struct btrfs_block_group *bg;

		em = rb_entry(node, struct extent_map, rb_node);
		map = em->map_lookup;
		bg = btrfs_create_block_group_cache(fs_info, em->start);
		if (!bg) {
			ret = -ENOMEM;
			break;
		}

		/* Fill dummy cache as FULL */
		bg->length = em->len;
		bg->flags = map->type;
		bg->last_byte_to_unpin = (u64)-1;
		bg->cached = BTRFS_CACHE_FINISHED;
		bg->used = em->len;
		bg->flags = map->type;
		ret = btrfs_add_block_group_cache(fs_info, bg);
		if (ret) {
			btrfs_remove_free_space_cache(bg);
			btrfs_put_block_group(bg);
			break;
		}
		btrfs_update_space_info(fs_info, bg->flags, em->len, em->len,
					0, 0, &space_info);
		bg->space_info = space_info;
		link_block_group(bg);

		set_avail_alloc_bits(fs_info, bg->flags);
	}
	if (!ret)
		btrfs_init_global_block_rsv(fs_info);
	return ret;
}
static int fill_dummy_bgs(struct btrfs_fs_info *fs_info)
{
	struct extent_map_tree *em_tree = &fs_info->mapping_tree;
	struct btrfs_space_info *space_info;
	struct rb_node *node;
	int ret = 0;

	for (node = rb_first_cached(&em_tree->map); node; node = rb_next(node)) {
		struct extent_map *em;
		struct map_lookup *map;
		struct btrfs_block_group *bg;

		em = rb_entry(node, struct extent_map, rb_node);
		map = em->map_lookup;
		bg = btrfs_create_block_group_cache(fs_info, em->start);
		if (!bg) {
			ret = -ENOMEM;
			break;
		}

		 
		bg->length = em->len;
		bg->flags = map->type;
		bg->last_byte_to_unpin = (u64)-1;
		bg->cached = BTRFS_CACHE_FINISHED;
		bg->used = em->len;
		bg->flags = map->type;
		ret = btrfs_add_block_group_cache(fs_info, bg);
		if (ret) {
			btrfs_remove_free_space_cache(bg);
			btrfs_put_block_group(bg);
			break;
		}
		btrfs_update_space_info(fs_info, bg->flags, em->len, em->len,
					0, 0, &space_info);
		bg->space_info = space_info;
		link_block_group(bg);

		set_avail_alloc_bits(fs_info, bg->flags);
	}
	if (!ret)
		btrfs_init_global_block_rsv(fs_info);
	return ret;
}