Re: [PATCH v14 014/138] mm/filemap: Add folio_next_index()

Mike Rapoport
2021-07-20T10:45:44Z

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@infradead.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Acked-by: Jeff Layton <jlayton@kernel.org>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Acked-by: Vlastimil Babka <vbabka@suse.cz>
> Reviewed-by: William Kucharski <william.kucharski@oracle.com>
> Reviewed-by: David Howells <dhowells@redhat.com>
> ---
> include/linux/pagemap.h | 11 +++++++++++
> 1 file changed, 11 insertions(+)

Acked-by: Mike Rapoport <rppt@linux.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.