void __bch2_btree_and_journal_iter_init_node_iter(struct btree_and_journal_iter *,
				struct bch_fs *, struct btree *,
				struct btree_node_iter, struct bpos)
void __bch2_btree_and_journal_iter_init_node_iter(struct btree_trans *,
				struct btree_and_journal_iter *, struct btree *,
				struct btree_node_iter, struct bpos)