md_bitmap_set_memory_bits
static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed);
md_bitmap_set_memory_bits(bitmap,
md_bitmap_set_memory_bits(bitmap,
md_bitmap_set_memory_bits(bitmap, sec, 1);
md_bitmap_set_memory_bits(mddev->bitmap, block, 1);