linux-kernel - Re: [PATCH v3 02/14] dm: add ->copy_from

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Date:   Sun, 18 Jun 2017 10:37:02 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     linux-nvdimm@...ts.01.org, Mike Snitzer <snitzer@...hat.com>,
        Toshi Kani <toshi.kani@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, dm-devel@...hat.com,
        viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org, hch@....de
Subject: Re: [PATCH v3 02/14] dm: add ->copy_from_iter() dax operation
        support

> +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?