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Date:   Fri, 1 May 2020 15:16:26 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Guoqing Jiang <guoqing.jiang@...ud.ionos.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        hch@...radead.org, david@...morbit.com
Subject: Re: [RFC PATCH V2 0/9] Introduce attach/clear_page_private to
 cleanup code

On Thu, Apr 30, 2020 at 11:44:41PM +0200, Guoqing Jiang wrote:
>   include/linux/pagemap.h: introduce attach/clear_page_private
>   md: remove __clear_page_buffers and use attach/clear_page_private
>   btrfs: use attach/clear_page_private
>   fs/buffer.c: use attach/clear_page_private
>   f2fs: use attach/clear_page_private
>   iomap: use attach/clear_page_private
>   ntfs: replace attach_page_buffers with attach_page_private
>   orangefs: use attach/clear_page_private
>   buffer_head.h: remove attach_page_buffers

I think mm/migrate.c could also use this:

        ClearPagePrivate(page);
        set_page_private(newpage, page_private(page));
        set_page_private(page, 0);
        put_page(page);
        get_page(newpage);

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