linux-ext4 - [PATCH 2/4] ext3: call blkdev_issue

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Message-ID: <482DDB5E.4030404@redhat.com>
Date:	Fri, 16 May 2008 14:07:10 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>,
	linux-kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Jamie Lokier <jamie@...reable.org>
Subject: [PATCH 2/4] ext3: call blkdev_issue_flush on fsync

To ensure that bits are truly on-disk after an fsync,
ext3 should call blkdev_issue_flush if barriers are supported.

Inspired by an old thread on barriers, by reiserfs & xfs
which do the same, and by a patch SuSE ships with their kernel

Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---
 fs/ext3/fsync.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/fs/ext3/fsync.c b/fs/ext3/fsync.c
index d336341..f6167ec 100644
--- a/fs/ext3/fsync.c
+++ b/fs/ext3/fsync.c
@@ -27,6 +27,7 @@
 #include <linux/sched.h>
 #include <linux/writeback.h>
 #include <linux/jbd.h>
+#include <linux/blkdev.h>
 #include <linux/ext3_fs.h>
 #include <linux/ext3_jbd.h>
 
@@ -45,6 +46,7 @@
 int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
 {
 	struct inode *inode = dentry->d_inode;
+	journal_t *journal = EXT3_SB(inode->i_sb)->s_journal;
 	int ret = 0;
 
 	J_ASSERT(ext3_journal_current_handle() == NULL);
@@ -85,6 +87,9 @@ int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
 			.nr_to_write = 0, /* sys_fsync did this */
 		};
 		ret = sync_inode(inode, &wbc);
+
+		if (journal && (journal->j_flags & JFS_BARRIER))
+			blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
 	}
 out:
 	return ret;
-- 1.5.3.6

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