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

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On Thu, May 09, 2024 at 08:08:28AM -0700, Darrick J. Wong wrote:
> Oh.  Right, this is for bs>ps.  For that case it makes sense to fail the
> mount.  I was only thinking about bs<=ps with large folios, where it
> doesn't.
> 
> (Would we use the zero-hugepage for large folios on a 4k fsblock fs?)

The direct I/O zeroing code always deals with sub-blocksize amounts.
The buffered zeroing path can deal with larger amounts in a few
cases, but that goes through the page cache anyway.





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