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From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: Yu Kuai <yukuai3@huawei.com>,
	hch@infradead.org, darrick.wong@oracle.com, david@fromorbit.com,
	linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, yi.zhang@huawei.com
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: [PATCH 1/3] iomap: Use kzalloc to allocate iomap_page
Date: Fri, 21 Aug 2020 13:46:04 +0100	[thread overview]
Message-ID: <20200821124606.10165-1-willy@infradead.org> (raw)
In-Reply-To: <20200821124424.GQ17456@casper.infradead.org>

We can skip most of the initialisation, although spinlocks still
need explicit initialisation as architectures may use a non-zero
value to indicate unlocked.  The comment is no longer useful as
attach_page_private() handles the refcount now.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/iomap/buffered-io.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 13d5cdab8dcd..639d54a4177e 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -49,16 +49,8 @@ iomap_page_create(struct inode *inode, struct page *page)
 	if (iop || i_blocks_per_page(inode, page) <= 1)
 		return iop;
 
-	iop = kmalloc(sizeof(*iop), GFP_NOFS | __GFP_NOFAIL);
-	atomic_set(&iop->read_count, 0);
-	atomic_set(&iop->write_count, 0);
+	iop = kzalloc(sizeof(*iop), GFP_NOFS | __GFP_NOFAIL);
 	spin_lock_init(&iop->uptodate_lock);
-	bitmap_zero(iop->uptodate, PAGE_SIZE / SECTOR_SIZE);
-
-	/*
-	 * migrate_page_move_mapping() assumes that pages with private data have
-	 * their count elevated by 1.
-	 */
 	attach_page_private(page, iop);
 	return iop;
 }
-- 
2.28.0


  reply	other threads:[~2020-08-21 12:46 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-21 12:33 [RFC PATCH V4] iomap: add support to track dirty state of sub pages Yu Kuai
2020-08-21 12:44 ` Matthew Wilcox
2020-08-21 12:46   ` Matthew Wilcox (Oracle) [this message]
2020-08-21 12:46     ` [PATCH 2/3] iomap: Use bitmap ops to set uptodate bits Matthew Wilcox (Oracle)
2020-08-22  5:59       ` Christoph Hellwig
2020-08-21 12:46     ` [PATCH 3/3] iomap: Support arbitrarily many blocks per page Matthew Wilcox (Oracle)
2020-08-21 12:48       ` Matthew Wilcox
2020-08-22  6:01       ` Christoph Hellwig
2020-08-22  5:57     ` [PATCH 1/3] iomap: Use kzalloc to allocate iomap_page Christoph Hellwig
2020-09-11  8:27   ` [RFC PATCH V4] iomap: add support to track dirty state of sub pages yukuai (C)
2020-09-11  8:35     ` yukuai (C)
2020-09-11 12:05     ` Matthew Wilcox
2020-09-25  2:30       ` yukuai (C)

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