dir.c

	struct inode *inode = file_inode(file);
	loff_t ret;

	mutex_lock(&inode->i_mutex);
	ret = generic_file_llseek(file, offset, whence);
	mutex_unlock(&inode->i_mutex);

	return ret;
}

const struct file_operations sysfs_dir_operations = {
	.read		= generic_read_dir,
	.iterate	= sysfs_readdir,
	.release	= sysfs_dir_release,
	.llseek		= sysfs_dir_llseek,
};