linux-kernel - Re: [PATCH v14 015/138] mm/filemap: Add folio_pos() and folio_file

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Date:   Tue, 20 Jul 2021 13:42:45 +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 015/138] mm/filemap: Add folio_pos() and
 folio_file_pos()

On Thu, Jul 15, 2021 at 04:35:01AM +0100, Matthew Wilcox (Oracle) wrote:
> These are just wrappers around page_offset() and page_file_offset()
> respectively.  No change 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 | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
> index bd0e7e91bfd4..aa71fa82d6be 100644
> --- a/include/linux/pagemap.h
> +++ b/include/linux/pagemap.h
> @@ -562,6 +562,27 @@ static inline loff_t page_file_offset(struct page *page)
>  	return ((loff_t)page_index(page)) << PAGE_SHIFT;
>  }
>  
> +/**
> + * folio_pos - Returns the byte position of this folio in its file.
> + * @folio: The folio.

kerneldoc will warn about missing description of return value.

> + */
> +static inline loff_t folio_pos(struct folio *folio)
> +{
> +	return page_offset(&folio->page);
> +}
> +
> +/**
> + * folio_file_pos - Returns the byte position of this folio in its file.
> + * @folio: The folio.
> + *
> + * This differs from folio_pos() for folios which belong to a swap file.
> + * NFS is the only filesystem today which needs to use folio_file_pos().

ditto

> + */
> +static inline loff_t folio_file_pos(struct folio *folio)
> +{
> +	return page_file_offset(&folio->page);
> +}
> +
>  extern pgoff_t linear_hugepage_index(struct vm_area_struct *vma,
>  				     unsigned long address);
>  
> -- 
> 2.30.2
> 
> 

-- 
Sincerely yours,
Mike.