static int __start_delalloc_inodes(struct btrfs_root *root, int delay_iput,
				   int nr)
{
	struct btrfs_inode *binode;
	struct inode *inode;
	struct btrfs_delalloc_work *work, *next;
	struct list_head works;
	struct list_head splice;
	int ret = 0;

	INIT_LIST_HEAD(&works);
	INIT_LIST_HEAD(&splice);

	mutex_lock(&root->delalloc_mutex);
	spin_lock(&root->delalloc_lock);
	list_splice_init(&root->delalloc_inodes, &splice);
	while (!list_empty(&splice)) {
		binode = list_entry(splice.next, struct btrfs_inode,
				    delalloc_inodes);

		list_move_tail(&binode->delalloc_inodes,
			       &root->delalloc_inodes);
		inode = igrab(&binode->vfs_inode);
		if (!inode) {
			cond_resched_lock(&root->delalloc_lock);
			continue;
		}
		spin_unlock(&root->delalloc_lock);

		work = btrfs_alloc_delalloc_work(inode, 0, delay_iput);
		if (!work) {
			if (delay_iput)
				btrfs_add_delayed_iput(inode);
			else
				iput(inode);
			ret = -ENOMEM;
			goto out;
		}
		list_add_tail(&work->list, &works);
		btrfs_queue_work(root->fs_info->flush_workers,
				 &work->work);
		ret++;
		if (nr != -1 && ret >= nr)
			goto out;
		cond_resched();
		spin_lock(&root->delalloc_lock);
	}
	spin_unlock(&root->delalloc_lock);

out:
	list_for_each_entry_safe(work, next, &works, list) {
		list_del_init(&work->list);
		btrfs_wait_and_free_delalloc_work(work);
	}

	if (!list_empty_careful(&splice)) {
		spin_lock(&root->delalloc_lock);
		list_splice_tail(&splice, &root->delalloc_inodes);
		spin_unlock(&root->delalloc_lock);
	}
	mutex_unlock(&root->delalloc_mutex);
	return ret;
}

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