BD_WAKE_SIZE
static u_int bd_wake_ary[BD_WAKE_SIZE];
if (count >= BD_WAKE_SIZE / 2)
count = BD_WAKE_SIZE / 2;
if (totalspace > MAXBSIZE * BD_WAKE_SIZE)
totalspace = MAXBSIZE * BD_WAKE_SIZE;
#define BD_WAKE_MASK (BD_WAKE_SIZE - 1)