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.
next prev parent reply other threads:[~2020-05-22 23:53 UTC|newest]
Thread overview: 25+ 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 ` [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 ` [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
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