bch_btree_insert_node
static int bch_btree_insert_node(struct btree *b, struct btree_op *op,
bch_btree_insert_node(b, op, &keylist, NULL, NULL);
bch_btree_insert_node(b, op, &keys, NULL, NULL);
bch_btree_insert_node(b->parent, op, &parent_keys, NULL, NULL);
ret = bch_btree_insert_node(b, op, &insert, NULL, NULL);
int ret = bch_btree_insert_node(b, &op->op, op->keys,