linux-ext4 - [PATCH 2/4] ext4: Avoid issuing barriers on error recovery path

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Date:	Tue, 27 Oct 2009 13:48:47 +0100
From:	Jan Kara <jack@...e.cz>
To:	linux-ext4@...r.kernel.org
Cc:	tytso@....edu, Jan Kara <jack@...e.cz>
Subject: [PATCH 2/4] ext4: Avoid issuing barriers on error recovery path

There is no reason why we should issue IO barriers when we
just hit an error in ext4_sync_file. So move out: label to
just return and introduce flush: label to those places which
really need it.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/fsync.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index 2b15312..2bf9413 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -88,7 +88,7 @@ int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
 		ret = sync_mapping_buffers(inode->i_mapping);
 
 	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
-		goto out;
+		goto flush;
 
 	/*
 	 * The VFS has written the file data.  If the inode is unaltered
@@ -103,8 +103,9 @@ int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
 		if (ret == 0)
 			ret = err;
 	}
-out:
+flush:
 	if (journal && (journal->j_flags & JBD2_BARRIER))
 		blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
+out:
 	return ret;
 }
-- 
1.6.0.2

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