mdu_disk_info_t    23 include/linux/raid/md_u.h #define GET_DISK_INFO		_IOR (MD_MAJOR, 0x12, mdu_disk_info_t)
mdu_disk_info_t    30 include/linux/raid/md_u.h #define ADD_NEW_DISK		_IOW (MD_MAJOR, 0x21, mdu_disk_info_t)
mdu_disk_info_t   127 init/do_mounts_md.c 		mdu_disk_info_t dinfo;