Re: [PATCH 03/10] ext4: Convert mpage_release_unused_pages() to use filemap_get_folios()

[Matthew Wilcox]

On Wed, Jun 08, 2022 at 01:02:22AM -0700, Christoph Hellwig wrote:
> On Sun, Jun 05, 2022 at 08:38:47PM +0100, Matthew Wilcox (Oracle) wrote:
> > If the folio is large, it may overlap the beginning or end of the
> > unused range.  If it does, we need to avoid invalidating it.
> 
> It's never going to be larger for ext4, is it?  But either way,
> those precautions looks fine.

I don't want to say "never".  Today, it's not, but if ext4 ever does
gain support for large folios, then this is a precaution it will need
to take.  I'm trying not to leave traps when I do conversions.

> Reviewed-by: Christoph Hellwig <hch@xxxxxx>