linux-ext4 - Re: [PATCH v2 12/19] btrfs: Convert btrfs_migratepage to migrate

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Date:   Thu, 9 Jun 2022 18:33:23 +0200
From:   David Sterba <dsterba@...e.cz>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-aio@...ck.org,
        linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-mm@...ck.org, linux-xfs@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-ntfs-dev@...ts.sourceforge.net,
        ocfs2-devel@....oracle.com, linux-mtd@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 12/19] btrfs: Convert btrfs_migratepage to
 migrate_folio

On Wed, Jun 08, 2022 at 04:02:42PM +0100, Matthew Wilcox (Oracle) wrote:
> Use filemap_migrate_folio() to do the bulk of the work, and then copy
> the ordered flag across if needed.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Reviewed-by: Christoph Hellwig <hch@....de>

Acked-by: David Sterba <dsterba@...e.com>

> +static int btrfs_migrate_folio(struct address_space *mapping,
> +			     struct folio *dst, struct folio *src,
>  			     enum migrate_mode mode)
>  {
> -	int ret;
> +	int ret = filemap_migrate_folio(mapping, dst, src, mode);
>  
> -	ret = migrate_page_move_mapping(mapping, newpage, page, 0);
>  	if (ret != MIGRATEPAGE_SUCCESS)
>  		return ret;
>  
> -	if (page_has_private(page))
> -		attach_page_private(newpage, detach_page_private(page));

If I'm reading it correctly, the private pointer does not need to be set
like that anymore because it's done somewhere during the
filemap_migrate_folio() call.

> -
> -	if (PageOrdered(page)) {
> -		ClearPageOrdered(page);
> -		SetPageOrdered(newpage);
> +	if (folio_test_ordered(src)) {
> +		folio_clear_ordered(src);
> +		folio_set_ordered(dst);
>  	}