linux-kernel - Re: [PATCH 19/21] iomap: Convert iomap_migrate

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Date:   Sat, 6 Nov 2021 03:44:36 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 19/21] iomap: Convert iomap_migrate_page to use folios

On Mon, Nov 01, 2021 at 08:39:27PM +0000, Matthew Wilcox (Oracle) wrote:
> +++ b/fs/iomap/buffered-io.c
> @@ -493,19 +493,21 @@ 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);

Re-reviewing this patch, and I don't like the naming.  How about:

	struct folio *src = page_folio(page);
	struct folio *dest = page_folio(newpage);

... eventually flowing that renaming throughout the migration
implementations.

>  	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);
> -- 
> 2.33.0
>