return -EINVAL;
return -EIO;
deadline_attr_store(struct kobject *kobj, struct attribute *attr,		    const char *page, size_t length){	elevator_t *e = container_of(kobj, elevator_t, kobj);	struct deadline_fs_entry *entry = to_deadline(attr);	if (!entry->store)		return -EINVAL;	return entry->store(e->elevator_data, page, length);}