btree_update_key
if (btree_update_key(bt, src, i, &key) != BT_SUCCESS)
if (btree_update_key(bt, src->parent, src->parent_index,
assert(btree_update_key(bt, src, 0, &nullkey) == BT_SUCCESS);
if (btree_update_key(bt, dst->parent, dst->parent_index,
assert(btree_update_key(bt, dst, 0, &nullkey) == BT_SUCCESS);
if (btree_update_key(bt, src->parent, 0, &key) != BT_SUCCESS)
static int btree_update_key(struct btree *bt, struct mpage *mp,