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SubjectRe: [PATCH] Fix vmtruncate race and distributed filesystem race
Andrew Morton <akpm@digeo.com> wrote:
>
> do_no_page()
> {
> int sequence = 0;
> ...
>
> retry:
> new_page = vma->vm_ops->nopage(vma, address & PAGE_MASK, &sequence);
> ....
> if (vma->vm_ops->revalidate && vma->vm_opa->revalidate(vma, sequence))
> goto retry;
> }

And this does require that ->nopage be entered with page_table_lock held,
and that it drop it.
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