void bch2_btree_and_journal_iter_init_node_iter(struct btree_and_journal_iter *iter,
						struct bch_fs *c,
						struct btree *b)
void bch2_btree_and_journal_iter_init_node_iter(struct btree_trans *trans,
						struct btree_and_journal_iter *iter,
						struct btree *b)