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From: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: david@fromorbit.com, hch@infradead.org, willy@infradead.org,
	Guoqing Jiang <guoqing.jiang@cloud.ionos.com>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	linux-xfs@vger.kernel.org
Subject: [RFC PATCH V3 06/10] iomap: use attach/detach_page_private
Date: Thu,  7 May 2020 23:43:56 +0200	[thread overview]
Message-ID: <20200507214400.15785-7-guoqing.jiang@cloud.ionos.com> (raw)
In-Reply-To: <20200507214400.15785-1-guoqing.jiang@cloud.ionos.com>

Since the new pair function is introduced, we can call them to clean the
code in iomap.

Cc: Christoph Hellwig <hch@infradead.org>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: linux-xfs@vger.kernel.org
Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
---
RFC V2 -> RFC V3
1. rename clear_page_private to detach_page_private.

RFC -> RFC V2
1. change the name of new functions to attach/clear_page_private.
2. call attach_page_private(newpage, clear_page_private(page)) to
   cleanup code further as suggested by Matthew Wilcox.
3. don't return attach_page_private in iomap_page_create per the
   comment from Christoph Hellwig.

 fs/iomap/buffered-io.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 89e21961d1ad..e3031007b4ae 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -59,24 +59,19 @@ iomap_page_create(struct inode *inode, struct page *page)
 	 * migrate_page_move_mapping() assumes that pages with private data have
 	 * their count elevated by 1.
 	 */
-	get_page(page);
-	set_page_private(page, (unsigned long)iop);
-	SetPagePrivate(page);
+	attach_page_private(page, iop);
 	return iop;
 }
 
 static void
 iomap_page_release(struct page *page)
 {
-	struct iomap_page *iop = to_iomap_page(page);
+	struct iomap_page *iop = detach_page_private(page);
 
 	if (!iop)
 		return;
 	WARN_ON_ONCE(atomic_read(&iop->read_count));
 	WARN_ON_ONCE(atomic_read(&iop->write_count));
-	ClearPagePrivate(page);
-	set_page_private(page, 0);
-	put_page(page);
 	kfree(iop);
 }
 
@@ -554,14 +549,8 @@ iomap_migrate_page(struct address_space *mapping, struct page *newpage,
 	if (ret != MIGRATEPAGE_SUCCESS)
 		return ret;
 
-	if (page_has_private(page)) {
-		ClearPagePrivate(page);
-		get_page(newpage);
-		set_page_private(newpage, page_private(page));
-		set_page_private(page, 0);
-		put_page(page);
-		SetPagePrivate(newpage);
-	}
+	if (page_has_private(page))
+		attach_page_private(newpage, detach_page_private(page));
 
 	if (mode != MIGRATE_SYNC_NO_COPY)
 		migrate_page_copy(newpage, page);
-- 
2.17.1


  parent reply	other threads:[~2020-05-07 21:44 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-07 21:43 [RFC PATCH V3 0/9] Introduce attach/detach_page_private to cleanup code Guoqing Jiang
2020-05-07 21:43 ` [RFC PATCH V3 01/10] include/linux/pagemap.h: introduce attach/detach_page_private Guoqing Jiang
2020-05-07 21:43 ` [RFC PATCH V3 02/10] md: remove __clear_page_buffers and use attach/detach_page_private Guoqing Jiang
2020-05-08  0:47   ` Song Liu
2020-05-07 21:43 ` [RFC PATCH V3 03/10] btrfs: " Guoqing Jiang
2020-05-07 21:43 ` [RFC PATCH V3 04/10] fs/buffer.c: " Guoqing Jiang
2020-05-07 21:43 ` [RFC PATCH V3 05/10] f2fs: " Guoqing Jiang
2020-05-07 21:43 ` Guoqing Jiang [this message]
2020-05-07 21:43 ` [RFC PATCH V3 07/10] ntfs: replace attach_page_buffers with attach_page_private Guoqing Jiang
2020-05-07 21:43 ` [RFC PATCH V3 08/10] orangefs: use attach/detach_page_private Guoqing Jiang
2020-05-07 21:43 ` [RFC PATCH V3 09/10] buffer_head.h: remove attach_page_buffers Guoqing Jiang
2020-05-07 21:44 ` [RFC PATCH V3 10/10] mm/migrate.c: call detach_page_private to cleanup code Guoqing Jiang

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