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

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Date:   Sun, 18 Jun 2017 19:04:56 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        Mike Snitzer <snitzer@...hat.com>,
        Toshi Kani <toshi.kani@....com>, X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dm-devel@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v3 02/14] dm: add ->copy_from_iter() dax operation support

On Sun, Jun 18, 2017 at 1:37 AM, Christoph Hellwig <hch@....de> 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.