#define BLKRRPART _IO(0x12,95) /* re-read partition table */
#define BLKGETSIZE _IO(0x12,96) /* return device size */
#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
+#define BLKSSZGET _IO(0x12,104) /* get block device sector size */
struct systypes {
unsigned char type;