mtd_oob_buf
struct mtd_oob_buf buf;
struct mtd_oob_buf __user *buf_user = argp;
struct mtd_oob_buf buf;
struct mtd_oob_buf __user *buf_user = argp;
#define MEMWRITEOOB _IOWR('M', 3, struct mtd_oob_buf)
#define MEMREADOOB _IOWR('M', 4, struct mtd_oob_buf)