Re: [PATCH] Fix vmtruncate race and distributed filesystem race

[Andrew Morton]

Andrew Morton <[e-mail]> 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.