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From: Andrew Morton <akpm@linux-foundation.org>
To: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Cc: Dave Chinner <david@fromorbit.com>,
	viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, hch@infradead.org,
	willy@infradead.org
Subject: Re: [PATCH 10/10] mm/migrate.c: call detach_page_private to cleanup code
Date: Fri, 22 May 2020 16:53:01 -0700	[thread overview]
Message-ID: <20200522165301.727977de1d39ac5bfb683ed0@linux-foundation.org> (raw)
In-Reply-To: <906f7469-492d-febc-c7ed-b01830ae900d@cloud.ionos.com>

On Fri, 22 May 2020 09:18:25 +0200 Guoqing Jiang <guoqing.jiang@cloud.ionos.com> wrote:

> >> -	ClearPagePrivate(page);
> >> -	set_page_private(newpage, page_private(page));
> >> -	set_page_private(page, 0);
> >> -	put_page(page);
> >> +	set_page_private(newpage, detach_page_private(page));
> > attach_page_private(newpage, detach_page_private(page));
> 
> Mattew had suggested it as follows, but not sure if we can reorder of 
> the setup of
> the bh and setting PagePrivate, so I didn't want to break the original 
> syntax.
> 
> @@ -797,11 +797,7 @@ static int __buffer_migrate_page(struct address_space *mapping,
>          if (rc != MIGRATEPAGE_SUCCESS)
>                  goto unlock_buffers;
>   
> -       ClearPagePrivate(page);
> -       set_page_private(newpage, page_private(page));
> -       set_page_private(page, 0);
> -       put_page(page);
> -       get_page(newpage);
> +       attach_page_private(newpage, detach_page_private(page));
>   
>          bh = head;
>          do {
> @@ -810,8 +806,6 @@ static int __buffer_migrate_page(struct address_space *mapping,
>   
>          } while (bh != head);
>   
> -       SetPagePrivate(newpage);
> -
>          if (mode != MIGRATE_SYNC_NO_COPY)

This is OK - coherency between PG_private and the page's buffer
ring is maintained by holding lock_page().

I have (effectively) applied the above change.

  reply	other threads:[~2020-05-22 23:53 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-17 21:47 [PATCH 00/10] Introduce attach/detach_page_private to cleanup code Guoqing Jiang
2020-05-17 21:47 ` [PATCH 01/10] include/linux/pagemap.h: introduce attach/detach_page_private Guoqing Jiang
2020-05-17 21:47   ` [f2fs-dev] " Guoqing Jiang
2020-05-17 21:47   ` Guoqing Jiang
2020-05-17 21:47 ` [PATCH 02/10] md: remove __clear_page_buffers and use attach/detach_page_private Guoqing Jiang
2020-05-17 21:47 ` [PATCH 03/10] btrfs: " Guoqing Jiang
2020-05-17 21:47 ` [PATCH 04/10] fs/buffer.c: " Guoqing Jiang
2020-05-17 21:47 ` [PATCH 05/10] f2fs: " Guoqing Jiang
2020-05-17 21:47   ` [f2fs-dev] " Guoqing Jiang
2020-05-17 21:47 ` [PATCH 06/10] iomap: " Guoqing Jiang
2020-05-17 21:47 ` [PATCH 07/10] ntfs: replace attach_page_buffers with attach_page_private Guoqing Jiang
2020-05-17 21:47 ` [PATCH 08/10] orangefs: use attach/detach_page_private Guoqing Jiang
2020-05-26 21:54   ` Mike Marshall
2020-05-28  8:39     ` Guoqing Jiang
2020-05-17 21:47 ` [PATCH 09/10] buffer_head.h: remove attach_page_buffers Guoqing Jiang
2020-05-17 21:47 ` [PATCH 10/10] mm/migrate.c: call detach_page_private to cleanup code Guoqing Jiang
2020-05-19  5:12   ` Andrew Morton
2020-05-19  7:35     ` Guoqing Jiang
2020-05-19 10:06       ` Gao Xiang
2020-05-19 11:02         ` Guoqing Jiang
2020-05-19 11:31           ` Gao Xiang
2020-05-19 15:16         ` Matthew Wilcox
2020-05-19 15:27           ` Gao Xiang
2020-05-19 20:44       ` Guoqing Jiang
2020-05-21 22:52   ` Dave Chinner
2020-05-22  7:18     ` Guoqing Jiang
2020-05-22 23:53       ` Andrew Morton [this message]
2020-05-24 19:02         ` Guoqing Jiang
2020-05-19 21:40 ` [UPDATE PATCH " Guoqing Jiang

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