linux-kernel - [PATCH v3 1/3] ext4: Clean up some wait_on_page

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Date:	Wed, 4 May 2011 10:39:17 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Chris Mason <chris.mason@...cle.com>,
	Jeff Layton <jlayton@...hat.com>, Jan Kara <jack@...e.cz>,
	Dave Chinner <david@...morbit.com>,
	Joel Becker <jlbec@...lplan.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jens Axboe <axboe@...nel.dk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Mingming Cao <mcao@...ibm.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>, linux-mm@...ck.org
Subject: [PATCH v3 1/3] ext4: Clean up some wait_on_page_writeback calls

wait_on_page_writeback already checks the writeback bit, so callers of it
needn't do that test.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---

 fs/ext4/inode.c       |    4 +---
 fs/ext4/move_extent.c |    3 +--
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f2fa5e8..3db34b2 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2796,9 +2796,7 @@ static int write_cache_pages_da(struct address_space *mapping,
 				continue;
 			}
 
-			if (PageWriteback(page))
-				wait_on_page_writeback(page);
-
+			wait_on_page_writeback(page);
 			BUG_ON(PageWriteback(page));
 
 			if (mpd->next_page != page->index)
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index d5c5783..d1548b1 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -876,8 +876,7 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
 	 * It needs to call wait_on_page_writeback() to wait for the
 	 * writeback of the page.
 	 */
-	if (PageWriteback(page))
-		wait_on_page_writeback(page);
+	wait_on_page_writeback(page);
 
 	/* Release old bh and drop refs */
 	try_to_release_page(page, 0);
--
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