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From: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: hch@infradead.org, david@fromorbit.com, willy@infradead.org,
	Guoqing Jiang <guoqing.jiang@cloud.ionos.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	William Kucharski <william.kucharski@oracle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Andreas Gruenbacher <agruenba@redhat.com>,
	Yang Shi <yang.shi@linux.alibaba.com>,
	Yafang Shao <laoar.shao@gmail.com>
Subject: [RFC PATCH 1/9] include/linux/pagemap.h: introduce set/clear_fs_page_private
Date: Sun, 26 Apr 2020 23:49:17 +0200	[thread overview]
Message-ID: <20200426214925.10970-2-guoqing.jiang@cloud.ionos.com> (raw)
In-Reply-To: <20200426214925.10970-1-guoqing.jiang@cloud.ionos.com>

The logic in attach_page_buffers and  __clear_page_buffers are quite
paired, but

1. they are located in different files.

2. attach_page_buffers is implemented in buffer_head.h, so it could be
   used by other files. But __clear_page_buffers is static function in
   buffer.c and other potential users can't call the function, md-bitmap
   even copied the function.

So, introduce the new set/clear_fs_page_private to replace them since
they are mostly used in fs layer. With the new pair of function, we will
remove the usage of attach_page_buffers and  __clear_page_buffers in
next patches.

Suggested-by: Matthew Wilcox <willy@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: William Kucharski <william.kucharski@oracle.com> 
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Cc: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
---
 include/linux/pagemap.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index a8f7bd8ea1c6..2a165ea647fe 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -205,6 +205,28 @@ static inline int page_cache_add_speculative(struct page *page, int count)
 	return __page_cache_add_speculative(page, count);
 }
 
+static inline void *set_fs_page_private(struct page *page, void *data)
+{
+	get_page(page);
+	set_page_private(page, (unsigned long)data);
+	SetPagePrivate(page);
+
+	return data;
+}
+
+static inline void *clear_fs_page_private(struct page *page)
+{
+	void *data = (void *)page_private(page);
+
+	if (!PagePrivate(page))
+		return NULL;
+	ClearPagePrivate(page);
+	set_page_private(page, 0);
+	put_page(page);
+
+	return data;
+}
+
 #ifdef CONFIG_NUMA
 extern struct page *__page_cache_alloc(gfp_t gfp);
 #else
-- 
2.17.1


  reply	other threads:[~2020-04-26 21:50 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-26 21:49 [RFC PATCH 0/9] Introduce set/clear_fs_page_private to cleanup code Guoqing Jiang
2020-04-26 21:49 ` Guoqing Jiang [this message]
2020-04-27  5:52   ` [RFC PATCH 1/9] include/linux/pagemap.h: introduce set/clear_fs_page_private Christoph Hellwig
2020-04-27  8:10     ` Guoqing Jiang
2020-04-26 21:49 ` [RFC PATCH 2/9] md: remove __clear_page_buffers and use set/clear_fs_page_private Guoqing Jiang
2020-04-26 21:49 ` [RFC PATCH 3/9] btrfs: " Guoqing Jiang
2020-04-26 22:20   ` Dave Chinner
2020-04-27  5:54     ` Christoph Hellwig
2020-04-27 12:27       ` David Sterba
2020-04-27  8:14     ` Guoqing Jiang
2020-04-26 21:49 ` [RFC PATCH 4/9] fs/buffer.c: " Guoqing Jiang
2020-04-26 21:49 ` [RFC PATCH 5/9] f2fs: " Guoqing Jiang
2020-04-27  2:22   ` Chao Yu
2020-04-27  8:10     ` Guoqing Jiang
2020-04-26 21:49 ` [RFC PATCH 6/9] iomap: " Guoqing Jiang
2020-04-27  0:26   ` Matthew Wilcox
2020-04-27  5:55     ` Christoph Hellwig
2020-04-27  8:15       ` Guoqing Jiang
2020-04-27  8:15     ` Guoqing Jiang
2020-04-27  5:57   ` Christoph Hellwig
2020-04-27  8:12     ` Guoqing Jiang
2020-04-26 21:49 ` [RFC PATCH 7/9] ntfs: replace attach_page_buffers with set_fs_page_private Guoqing Jiang
2020-04-26 21:49 ` [RFC PATCH 8/9] orangefs: use set/clear_fs_page_private Guoqing Jiang
2020-04-26 22:24   ` Dave Chinner
2020-04-27  0:12     ` Matthew Wilcox
2020-04-27  2:27       ` Dave Chinner
2020-04-27  8:18         ` Guoqing Jiang
2020-04-27  2:58     ` Gao Xiang
2020-04-27  3:27       ` Gao Xiang
2020-04-26 21:49 ` [RFC PATCH 9/9] buffer_head.h: remove attach_page_buffers Guoqing Jiang

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