EBITMAP_UNIT_SIZE
offset += EBITMAP_UNIT_SIZE;
offset += EBITMAP_UNIT_SIZE;
offset += EBITMAP_UNIT_SIZE;
u32 lastsetbit = n2->startbit + i * EBITMAP_UNIT_SIZE +
index = (startbit - n->startbit) / EBITMAP_UNIT_SIZE;
#define EBITMAP_SIZE (EBITMAP_UNIT_NUMS * EBITMAP_UNIT_SIZE)
(((x) >> EBITMAP_UNIT_SIZE / 2) >> EBITMAP_UNIT_SIZE / 2)
(((bit) - (node)->startbit) / EBITMAP_UNIT_SIZE)
(((bit) - (node)->startbit) % EBITMAP_UNIT_SIZE)