From: Christoph Hellwig [mailto:hch@infradead.org]

Either way we need to get rid of buffer_heads, and another aop that is entirely
caller specific is unaceptable.

I finally figured out what you actually meant by this.  You mean that instead of having an aop->populate_pfn, you want to define a populate_pfn_t callback and pass it in.

Something like this:

int ext2_populate_pfn(struct address_space *mapping, pgoff_t pgoff)
{
	struct iomap iomap;
	...
	return dax_populate_pfn(mapping, pgoff, &iomap);
}

int ext2_dax_fault(vma, vmf)
{
	...
	ret = dax_fault(vma, vmf, ext2_populate_pfn);
	...
}

I don't have a problem with that.  I'll work up something along those lines next week.

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