rem: void dump_dev_size(int dev)
add: static void dump_dev_size(int dev)
context: void dump_dev_size(int dev){	size_t sz;	if (ioctl(dev, B_GET_DEVICE_SIZE, &sz, sizeof(sz)) < 0) {		perror("ioctl(B_GET_DEVICE_SIZE)");		return;	}	printf("size: %ld bytes\n", sz);	puts("");}