> The truncate logic can't be duplicated because it works on struct pages.
>
> What sounds best, if you use nopfn, is to do your own internal
> synchronisation against your unmap call. Obviously you can't because you
> have no ->nopfn_done call with which to drop locks ;)
>
> So, hmm yes I have a good idea for how fault() could take over ->nopfn as
> well: just return NULL, set the fault type to VM_FAULT_MINOR, and have
> the ->fault handler install the pte. It will require a new helper along
> the lines of vm_insert_page.
>
> I'll code that up in my next patchset.
Which is exactly what I was proposing in my other mail :)
Read it, you'll understnad my point about the truncate logic... I
sometimes want to return struct page (when the mapping is pointing to
backup memory) or map it directly to hardware.
In the later case, with an appropriate helper, I can definitely do my
own locking. In the former case, I return struct page's and need the
truncate logic.
Ben.
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