sgfru_copyin_buffer
if (sgfru_copyin_buffer(iargp, payld.frus, max_cnt, tdatap) != 0) {
if (sgfru_copyin_buffer(iargp, segs.frus, max_cnt, tdatap) != 0) {
if (sgfru_copyin_buffer(iargp, append.payload_data, append.payload_cnt,
static int sgfru_copyin_buffer(const sgfru_init_arg_t *argp,