COUNTER_MAX
if (index >= COUNTER_MAX)
u64 counters[COUNTER_MAX];
#define COUNTER(x) (((bitmap_counter_t) x) & COUNTER_MAX)
if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) {
if (COUNTER(*bmc) == COUNTER_MAX)
if (backlog > COUNTER_MAX)
if (write_behind > COUNTER_MAX / 2)
write_behind = COUNTER_MAX / 2;
else if (write_behind > COUNTER_MAX)