-#include <linux/types.h> /* for __u64 for u64 for BLKGETSIZE64 */
-#define u64 __u64
-#include <linux/fs.h> /* for BLKGETSIZE64 */
+/* Do not: #include <linux/fs.h> * for 'BLKGETSIZE64' *
+ * as including any Linux kernel include files is too much incompatible.
+ */
+#include <sys/mount.h> /* for 'BLKGETSIZE' */