linux-ext4 - [PATCH] ext4: Ensure writecache to disk in no journal mode

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Message-Id: <1269620462-25906-1-git-send-email-surbhi.palande@canonical.com>
Date:	Fri, 26 Mar 2010 18:21:02 +0200
From:	Surbhi Palande <surbhi.palande@...onical.com>
To:	linux-ext4@...r.kernel.org
Cc:	Theodore Tso <tytso@....edu>
Subject: [PATCH] ext4: Ensure writecache to disk in no journal mode

Ensure that in the no journal mode the write cache is flushed to the disk by
calling a blkdev_issue_flush() which issues a WRITE_BARRIER if necessary.

Signed-off-by: Surbhi Palande <surbhi.palande@...onical.com>
---
 fs/ext4/fsync.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index d6049e4..1d73a50 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -67,8 +67,12 @@ int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
 	if (ret < 0)
 		return ret;
 
-	if (!journal)
-		return simple_fsync(file, dentry, datasync);
+	if (!journal) {
+		ret = simple_fsync(file, dentry, datasync);
+		if (test_opt(inode->i_sb, BARRIER))
+			blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
+		return ret;
+	}
 
 	/*
 	 * data=writeback,ordered:
-- 
1.6.3.3

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