linux-kernel - Re: [PATCH v14 107/138] iomap: Convert iomap_migrate

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Date:   Thu, 15 Jul 2021 15:05:30 -0700
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v14 107/138] iomap: Convert iomap_migrate_page to use
 folios

On Thu, Jul 15, 2021 at 04:36:33AM +0100, Matthew Wilcox (Oracle) wrote:
> The arguments are still pages for now, but we can use folios internally
> and cut out a lot of calls to compound_head().
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>

Pretty straightforward conversion.
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> ---
>  fs/iomap/buffered-io.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index 0731e2c3f44b..48de198c5603 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -490,19 +490,21 @@ int
>  iomap_migrate_page(struct address_space *mapping, struct page *newpage,
>  		struct page *page, enum migrate_mode mode)
>  {
> +	struct folio *folio = page_folio(page);
> +	struct folio *newfolio = page_folio(newpage);
>  	int ret;
>  
> -	ret = migrate_page_move_mapping(mapping, newpage, page, 0);
> +	ret = folio_migrate_mapping(mapping, newfolio, folio, 0);
>  	if (ret != MIGRATEPAGE_SUCCESS)
>  		return ret;
>  
> -	if (page_has_private(page))
> -		attach_page_private(newpage, detach_page_private(page));
> +	if (folio_test_private(folio))
> +		folio_attach_private(newfolio, folio_detach_private(folio));
>  
>  	if (mode != MIGRATE_SYNC_NO_COPY)
> -		migrate_page_copy(newpage, page);
> +		folio_migrate_copy(newfolio, folio);
>  	else
> -		migrate_page_states(newpage, page);
> +		folio_migrate_flags(newfolio, folio);
>  	return MIGRATEPAGE_SUCCESS;
>  }
>  EXPORT_SYMBOL_GPL(iomap_migrate_page);
> -- 
> 2.30.2
>