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From: Munehiro Ikeda on 8 Jul 2010 23:30
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(a)ds.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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Next: [RFC][PATCH 09/11] blkiocg async: Functions to get cfqg from bio