Re: [PATCH v2 34/46] mm/filemap: Add i_blocks_per_folio()

[Christoph Hellwig]

On Tue, Jun 22, 2021 at 01:15:39PM +0100, Matthew Wilcox (Oracle) wrote:
> Reimplement i_blocks_per_page() as a wrapper around i_blocks_per_folio().
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> ---
>  include/linux/pagemap.h | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
> index 31edfa891987..c30db827b65d 100644
> --- a/include/linux/pagemap.h
> +++ b/include/linux/pagemap.h
> @@ -1149,19 +1149,25 @@ static inline int page_mkwrite_check_truncate(struct page *page,
>  }
>  
>  /**
> - * i_blocks_per_page - How many blocks fit in this page.
> + * i_blocks_per_folio - How many blocks fit in this folio.
>   * @inode: The inode which contains the blocks.
> - * @page: The page (head page if the page is a THP).
> + * @folio: The folio.
>   *
> - * If the block size is larger than the size of this page, return zero.
> + * If the block size is larger than the size of this folio, return zero.
>   *
> - * Context: The caller should hold a refcount on the page to prevent it
> + * Context: The caller should hold a refcount on the folio to prevent it
>   * from being split.
> - * Return: The number of filesystem blocks covered by this page.
> + * Return: The number of filesystem blocks covered by this folio.
>   */
> +static inline
> +unsigned int i_blocks_per_folio(struct inode *inode, struct folio *folio)

Weirdo formatting (same as i_blocks_per_page, but I'd still rather avoid
it).

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>