extern int sysfs_set_array(struct mdinfo *sra,
struct mdinfo *info);
extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd);
-extern int sysfs_disk_to_sg(int fd);
extern int sysfs_disk_to_scsi_id(int fd, __u32 *id);
extern int sysfs_unique_holder(int devnum, long rdev);