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

[Dan Williams]

On Sun, Jun 18, 2017 at 1:37 AM, Christoph Hellwig <hch@xxxxxx> wrote:
>> +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?

You mean update all implementations to register copy_from_iter() as
their default op rather than workaround a NULL op in the core? Yeah, I
can do that.