linux-kernel - Re: [PATCH v14 014/138] mm/filemap: Add folio_next

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Date:   Tue, 20 Jul 2021 13:42:11 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Jeff Layton <jlayton@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        William Kucharski <william.kucharski@...cle.com>,
        David Howells <dhowells@...hat.com>
Subject: Re: [PATCH v14 014/138] mm/filemap: Add folio_next_index()

On Thu, Jul 15, 2021 at 04:35:00AM +0100, Matthew Wilcox (Oracle) wrote:
> This helper returns the page index of the next folio in the file (ie
> the end of this folio, plus one).
> 
> No changes to generated code.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Acked-by: Jeff Layton <jlayton@...nel.org>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Reviewed-by: William Kucharski <william.kucharski@...cle.com>
> Reviewed-by: David Howells <dhowells@...hat.com>
> ---
>  include/linux/pagemap.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)

Acked-by: Mike Rapoport <rppt@...ux.ibm.com>

> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
> index f7c165b5991f..bd0e7e91bfd4 100644
> --- a/include/linux/pagemap.h
> +++ b/include/linux/pagemap.h
> @@ -406,6 +406,17 @@ static inline pgoff_t folio_index(struct folio *folio)
>          return folio->index;
>  }
>  
> +/**
> + * folio_next_index - Get the index of the next folio.
> + * @folio: The current folio.
> + *
> + * Return: The index of the folio which follows this folio in the file.
> + */

Maybe note that index is in units of pages?

> +static inline pgoff_t folio_next_index(struct folio *folio)
> +{
> +	return folio->index + folio_nr_pages(folio);
> +}
> +
>  /**
>   * folio_file_page - The page for a particular index.
>   * @folio: The folio which contains this index.
> -- 
> 2.30.2
> 
> 

-- 
Sincerely yours,
Mike.