[PATCH] exofs: Avoid using file_fsync()

[Boaz Harrosh <bharrosh@panasas.com>]

Please review the below patch. I will try to push it through the
exofs tree for 2.6.31 

---
Subject: [PATCH] exofs: Avoid using file_fsync()

The use of file_fsync() in exofs_file_sync() is not necessary since it
does some extra stuff not used by exofs. Open code just the parts that
are currently needed.

TODO: Farther optimization can be done to sync the sb only on inode
update of new files, Usually the sb update is not needed in exofs.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 fs/exofs/file.c |   18 +++++++++++++-----
 1 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/fs/exofs/file.c b/fs/exofs/file.c
index 6ed7fe4..9e60d68 100644
--- a/fs/exofs/file.c
+++ b/fs/exofs/file.c
@@ -47,16 +47,24 @@ static int exofs_file_fsync(struct file *filp, struct dentry *dentry,
 {
 	int ret;
 	struct address_space *mapping = filp->f_mapping;
+	struct inode * inode = dentry->d_inode;
+	struct super_block * sb;
 
 	ret = filemap_write_and_wait(mapping);
 	if (ret)
 		return ret;
 
-	/*Note: file_fsync below also calles sync_blockdev, which is a no-op
-	 *      for exofs, but other then that it does sync_inode and
-	 *      sync_superblock which is what we need here.
-	 */
-	return file_fsync(filp, dentry, datasync);
+	/* sync the inode attributes */
+	ret = write_inode_now(inode, 0);
+
+	/* This is a good place to write the sb */
+	/* TODO: Sechedule an sb-sync on create */
+	sb = inode->i_sb;
+	lock_super(sb);
+	if (sb->s_dirt && sb->s_op->write_super)
+		sb->s_op->write_super(sb);
+	unlock_super(sb);
+	return ret;
 }
 
 static int exofs_flush(struct file *file, fl_owner_t id)
-- 
1.6.2.1