mdu_disk_info_t
mdu_disk_info_t info;
mdu_disk_info_t info;
mdu_disk_info_t info;
#define GET_DISK_INFO _IOR (MD_MAJOR, 0x12, mdu_disk_info_t)
#define ADD_NEW_DISK _IOW (MD_MAJOR, 0x21, mdu_disk_info_t)