NDENTRIES
sub = bitmap[off] | ((u_int)~0 >> (NDENTRIES - i));
(last + NDENTRIES - 1) >> NDENTRYSHIFT);
NDENTRIES);
u_int fd_dhimap[NDENTRIES >> NDENTRYSHIFT];
u_int fd_dlomap[NDENTRIES];
#define NDENTRYMASK (NDENTRIES - 1)
#define NDREDUCE(x) (((x) + NDENTRIES - 1) >> NDENTRYSHIFT)