xlog_cycle_data
*xlog_cycle_data(rhead, i) = *(__be32 *)dp;
clientid = xlog_get_client_id(*xlog_cycle_data(rhead, idx));
op_len = be32_to_cpu(*xlog_cycle_data(rhead, idx));
*(__be32 *)dp = *xlog_cycle_data(rhead, i);