BM_BLOCK_SIZE
buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
device->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME;
number = SLEEP_TIME * device->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ);
size = BM_BLOCK_SIZE;
#if DRBD_MAX_BIO_SIZE > BM_BLOCK_SIZE
if (size + BM_BLOCK_SIZE > max_bio_size)
size += BM_BLOCK_SIZE;
if ((BM_BLOCK_SIZE << align) <= size)
if (size > BM_BLOCK_SIZE)
size = BM_BLOCK_SIZE;