xfs_btree_get_buf_block
error = xfs_btree_get_buf_block(cur, &rptr, &right, &rbp);
error = xfs_btree_get_buf_block(cur, &nptr, &cblock, &cbp);
error = xfs_btree_get_buf_block(cur, &lptr, &new, &nbp);
int xfs_btree_get_buf_block(struct xfs_btree_cur *cur,
ret = xfs_btree_get_buf_block(cur, &new_ptr, &new_block, &new_bp);