HAMMER2_SEGRADIX
bmap = &chain->data->bmdata[(int)(data_off >> HAMMER2_SEGRADIX) &
bitmap = &bmap->bitmapq[(int)(data_off >> (HAMMER2_SEGRADIX - 3)) & 7];
bmap = &chain->data->bmdata[(int)(data_off >> HAMMER2_SEGRADIX) &
bitmap = &bmap->bitmapq[(int)(data_off >> (HAMMER2_SEGRADIX - 3)) & 7];