return -EINVAL;
return -EIO;
flush_write(struct dentry *dentry, char *buffer, loff_t offset, size_t count){	struct bin_attribute *attr = to_bin_attr(dentry);	struct kobject *kobj = to_kobj(dentry->d_parent);	if (!attr->write)		return -EINVAL;	return attr->write(kobj, buffer, offset, count);}