R_SENT
if ((rep->r_flags & R_SENT) == 0) {
rep->r_flags |= R_SENT;
if (rep->r_flags & R_SENT) {
rep->r_flags &= ~R_SENT;
(req->r_flags & (R_SENT | R_NEEDSXMIT)) &&
req->r_flags |= R_SENT;
if (rep->r_flags & R_SENT) {
rep->r_flags &= ~R_SENT;
if (rep->r_flags & R_SENT) {
rep->r_flags &= ~R_SENT;