srp_putp
ASSERT3P(srpp->srp_putp, ==, srfppp->srfpp_putp);
putp = (void *)(srpp->srp_putp + off);
srpp->srp_putp = NULL;
srpp->srp_putp = srfppp->srfpp_putp;
srpp->srp_putp = NULL;