fa3_rdev
fp->fa3_rdev.specdata1 = txdr_unsigned(major(vap->va_rdev));
fp->fa3_rdev.specdata2 = txdr_unsigned(minor(vap->va_rdev));
rdev = makedev(fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata1),
fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata2));
(u_int32_t) ntohl(fap->fa3_rdev.specdata1),
(u_int32_t) ntohl(fap->fa3_rdev.specdata2));