linux-kernel - [PATCH 8/17] jfs: use locking read_mapping

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Date:	Wed, 11 Apr 2007 19:49:38 -0700
From:	Nate Diller <nate.diller@...il.com>
To:	Andrew Morton <akpm@...l.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>,
	David Woodhouse <dwmw2@...radead.org>,
	Dave Kleikamp <shaggy@...tin.ibm.com>,
	Anton Altaparmakov <aia21@...tab.net>,
	Evgeniy Dushistov <dushistov@...l.ru>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	reiserfs-dev@...esys.com
Subject: [PATCH 8/17] jfs: use locking read_mapping_page

Use the new locking variant of read_mapping_page to avoid doing extra work.

Signed-off-by: Nate Diller <nate.diller@...il.com>

---

diff -urpN -X dontdiff linux-2.6.21-rc6-mm1/fs/jfs/jfs_metapage.c linux-2.6.21-rc6-mm1-test/fs/jfs/jfs_metapage.c
--- linux-2.6.21-rc6-mm1/fs/jfs/jfs_metapage.c	2007-04-09 17:23:48.000000000 -0700
+++ linux-2.6.21-rc6-mm1-test/fs/jfs/jfs_metapage.c	2007-04-09 21:37:09.000000000 -0700
@@ -632,12 +632,11 @@ struct metapage *__get_metapage(struct i
 		}
 		SetPageUptodate(page);
 	} else {
-		page = read_mapping_page(mapping, page_index, NULL);
-		if (IS_ERR(page) || !PageUptodate(page)) {
+		page = __read_mapping_page(mapping, page_index, NULL);
+		if (IS_ERR(page)) {
 			jfs_err("read_mapping_page failed!");
 			return NULL;
 		}
-		lock_page(page);
 	}
 
 	mp = page_to_mp(page, page_offset);
-
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