EBITMAP_UNIT_NUMS
for (iter = 0; iter < EBITMAP_UNIT_NUMS; iter++) {
for (i = EBITMAP_UNIT_NUMS - 1; (i >= 0) && !n2->maps[i];)
BUG_ON(index >= EBITMAP_UNIT_NUMS);
BUG_ON(index >= EBITMAP_UNIT_NUMS);
#define EBITMAP_SIZE (EBITMAP_UNIT_NUMS * EBITMAP_UNIT_SIZE)
unsigned long maps[EBITMAP_UNIT_NUMS];
BUG_ON(index >= EBITMAP_UNIT_NUMS);