ovl: add ovl_write_iter()

	return ret;

}

static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)

{

	struct file *file = iocb->ki_filp;

	struct inode *inode = file_inode(file);

	struct fd real;

	const struct cred *old_cred;

	ssize_t ret;

	if (!iov_iter_count(iter))

		return 0;

	inode_lock(inode);

	/* Update mode */

	ovl_copyattr(ovl_inode_real(inode), inode);

	ret = file_remove_privs(file);

	if (ret)

		goto out_unlock;

	ret = ovl_real_fdget(file, &real);

	if (ret)

		goto out_unlock;

	old_cred = ovl_override_creds(file_inode(file)->i_sb);

	ret = vfs_iter_write(real.file, iter, &iocb->ki_pos,

			     ovl_iocb_to_rwf(iocb));

	revert_creds(old_cred);

	/* Update size */

	ovl_copyattr(ovl_inode_real(inode), inode);

	fdput(real);

out_unlock:

	inode_unlock(inode);

	return ret;

}

const struct file_operations ovl_file_operations = {

	.open		= ovl_open,

	.release	= ovl_release,

	.llseek		= ovl_llseek,

	.read_iter	= ovl_read_iter,

	.write_iter	= ovl_write_iter,

};