MNT_EXRDONLY
#define NFSVNO_EXRDONLY(e) ((e)->nes_exflag & MNT_EXRDONLY)
#define NFSVNO_SETEXRDONLY(e) ((e)->nes_exflag = (MNT_EXPORTED|MNT_EXRDONLY))
MNT_FLAG(MNT_EXRDONLY);
if (exflags & MNT_EXRDONLY ||
MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
*exflagsp |= MNT_EXRDONLY;
*exflagsp |= (MNT_EXPUBLIC|MNT_EXRDONLY|MNT_EXPORTANON);