GRU_HANDLE_BYTES
if (copy_to_user(*dp, s, GRU_HANDLE_BYTES))
*dp += GRU_HANDLE_BYTES;
memcpy(d, s, GRU_HANDLE_BYTES);
return GRU_HANDLE_BYTES;
#define CBR_BYTES(cbr) ((cbr) * GRU_HANDLE_BYTES * GRU_CBR_AU_SIZE * 2)