NFSD_REQINPROG
if (!ISSET(nfsd->nfsd_flag, NFSD_REQINPROG)) {
SET(nfsd->nfsd_flag, NFSD_REQINPROG);
CLR(nfsd->nfsd_flag, NFSD_REQINPROG);
nfsd->nfsd_flag &= ~NFSD_REQINPROG;