Re: [RFC] iomap: use huge zero folio in iomap_dio_zero

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On Thu, May 09, 2024 at 12:31:07PM +0000, Pankaj Raghav (Samsung) wrote:
> > Well, that's why I suggest doing it at mount time.  Asking for it deep
> > down in the write code is certainly going to be a bit problematic.
> 
> Makes sense. But failing to mount because we can't get a huge zero folio
> seems wrong as we still can't guarantee it even at mount time.
> 
> With the current infrastructure I don't see anyway of geting a huge zero
> folio that is guaranteed so that we don't need any fallback.

You export get_huge_zero_page, put_huge_zero_page (they might need a
rename and kerneldoc for the final version) and huge_zero_folio or a
wrapper to get it, and then call get_huge_zero_page from mount,
from unmount and just use huge_zero_folio which is guaranteed to
exist once get_huge_zero_page succeeded.





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