test.c

static int get_cur_inode_state(struct send_ctx *sctx, u64 ino, u64 gen,
			       u64 *send_gen, u64 *parent_gen)
{
	int ret;
	int left_ret;
	int right_ret;
	u64 left_gen;
	u64 right_gen;
	struct btrfs_inode_info info;

	ret = get_inode_info(sctx->send_root, ino, &info);
	if (ret < 0 && ret != -ENOENT)
		goto out;
	left_ret = (info.nlink == 0) ? -ENOENT : ret;
	left_gen = info.gen;
	if (send_gen)
		*send_gen = ((left_ret == -ENOENT) ? 0 : info.gen);

	if (!sctx->parent_root) {
		right_ret = -ENOENT;
	} else {
		ret = get_inode_info(sctx->parent_root, ino, &info);
		if (ret < 0 && ret != -ENOENT)
			goto out;
		right_ret = (info.nlink == 0) ? -ENOENT : ret;
		right_gen = info.gen;
		if (parent_gen)
			*parent_gen = ((right_ret == -ENOENT) ? 0 : info.gen);
	}

	if (!left_ret && !right_ret) {
		if (left_gen == gen && right_gen == gen) {
			ret = inode_state_no_change;
		} else if (left_gen == gen) {
			if (ino < sctx->send_progress)
				ret = inode_state_did_create;
			else
				ret = inode_state_will_create;
		} else if (right_gen == gen) {
			if (ino < sctx->send_progress)
				ret = inode_state_did_delete;
			else
				ret = inode_state_will_delete;
		} else  {
			ret = -ENOENT;
		}
	} else if (!left_ret) {
		if (left_gen == gen) {
			if (ino < sctx->send_progress)
				ret = inode_state_did_create;
			else
				ret = inode_state_will_create;
		} else {
			ret = -ENOENT;
		}
	} else if (!right_ret) {
		if (right_gen == gen) {
			if (ino < sctx->send_progress)
				ret = inode_state_did_delete;
			else
				ret = inode_state_will_delete;
		} else {
			ret = -ENOENT;
		}
	} else {
		ret = -ENOENT;
	}

out:
	return ret;
}