linux-kernel - Re: [PATCH v2 44/46] mm/filemap: Convert mapping_get

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Date:   Mon, 28 Jun 2021 07:07:23 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Christoph Hellwig <hch@...radead.org>, akpm@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 44/46] mm/filemap: Convert mapping_get_entry to return
 a folio

On Fri, Jun 25, 2021 at 04:29:47AM +0100, Matthew Wilcox wrote:
> > > - * Return: The head page or shadow entry, %NULL if nothing is found.
> > > + * Return: The folio, swap or shadow entry, %NULL if nothing is found.
> > 
> > This (old and new) reads a little weird, given that it returns a
> > struct folio, even if that happens to be a magic entry.
> 
> Yeah.  How about this?
> 
> - * Return: The head page or shadow entry, %NULL if nothing is found.
> + * Return: The folio, swap or shadow entry, %NULL if nothing is found.
>   */
> -static struct page *mapping_get_entry(struct address_space *mapping,
> -               pgoff_t index)
> +static void *mapping_get_entry(struct address_space *mapping, pgoff_t index)
>  {
> 
> I still use a struct folio in mapping_get_entry(), but this means that
> pagecache_get_page() doesn't change in this patch.

Much better, thanks.