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Subject: Re: [PATCH v10 13/33] mm/filemap: Add folio_next_index
To:     "Matthew Wilcox (Oracle)" <willy@infradead.org>,
        akpm@linux-foundation.org
Cc:     linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
        Jeff Layton <jlayton@kernel.org>
References: <20210511214735.1836149-1-willy@infradead.org>
 <20210511214735.1836149-14-willy@infradead.org>
From:   Vlastimil Babka <vbabka@suse.cz>
Message-ID: <92518dfb-5624-62d7-9998-305587fc561c@suse.cz>
Date:   Fri, 14 May 2021 19:07:23 +0200
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On 5/11/21 11:47 PM, 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).
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Acked-by: Jeff Layton <jlayton@kernel.org>

Acked-by: Vlastimil Babka <vbabka@suse.cz>

> ---
>  include/linux/pagemap.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
> index 8eaeffccfd38..3b82252d12fc 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.
> + */
> +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.
>