Re: [PATCH v3 02/14] dm: add ->copy_from_iter() dax operation support

[Christoph Hellwig]

> +size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
> +		size_t bytes, struct iov_iter *i)
> +{
> +	if (!dax_alive(dax_dev))
> +		return 0;
> +
> +	if (!dax_dev->ops->copy_from_iter)
> +		return copy_from_iter(addr, bytes, i);
> +	return dax_dev->ops->copy_from_iter(dax_dev, pgoff, addr, bytes, i);
> +}
> +EXPORT_SYMBOL_GPL(dax_copy_from_iter);

Can you remove the fallbacks after this series so that we have
a clean abstraction?