linux-kernel - [RFC][PATCH 06/11] blkiocg async: ext4_writepage not to overwrite iotrack info

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Date:	Thu, 08 Jul 2010 23:17:48 -0400
From:	Munehiro Ikeda <m-ikeda@...jp.nec.com>
To:	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	Vivek Goyal <vgoyal@...hat.com>
CC:	Munehiro Ikeda <m-ikeda@...jp.nec.com>,
	Ryo Tsuruta <ryov@...inux.co.jp>, taka@...inux.co.jp,
	kamezawa.hiroyu@...fujitsu.com,
	Andrea Righi <righi.andrea@...il.com>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>,
	akpm@...ux-foundation.org, balbir@...ux.vnet.ibm.com
Subject: [RFC][PATCH 06/11] blkiocg async: ext4_writepage not to overwrite
 iotrack info

This patch is for ext4 to utilize iotrack.

ext4_writepage() calls block_commit_write() if the page doesn't
has buffer.  This overwrites original iotrack info who dirtied
the page.

To prevent this, this patch changes block_commit_write()
call into block_commit_write_noiotrack() call in ext4_writepage().

ToDo:
To check if there is fs which overwrites the info other than ext4.

Signed-off-by: Munehiro "Muuhh" Ikeda <m-ikeda@...jp.nec.com>
---
 fs/ext4/inode.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 42272d6..45a2d51 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2737,7 +2737,7 @@ static int ext4_writepage(struct page *page,
 			return 0;
 		}
 		/* now mark the buffer_heads as dirty and uptodate */
-		block_commit_write(page, 0, len);
+		block_commit_write_noiotrack(page, 0, len);
 	}
 
 	if (PageChecked(page) && ext4_should_journal_data(inode)) {
-- 
1.6.2.5
--
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