From 180040b89ee2aed88c0a0b1fcf7ada9a512b12e3 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@infradead.org>
Date: Fri, 5 Feb 2010 09:57:55 +0000
Subject: xfs: optimize log flushing in xfs_fsync

If we have a pinned inode it must have a log item attached to it.
Usually that log item will have ili_last_lsn already set, in which
case we only need to flush the log up to that LSN instead of doing a
full log force.  This gives speedups of about 5% in some fsync heavy
workloads.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 43241e2..ddd2c5d 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -629,8 +629,14 @@ xfs_fsync(
 		 */
 		xfs_iunlock(ip, XFS_ILOCK_SHARED);
 		if (xfs_ipincount(ip)) {
-			error = _xfs_log_force(ip->i_mount, XFS_LOG_SYNC,
-					       &log_flushed);
+			if (ip->i_itemp->ili_last_lsn) {
+				error = _xfs_log_force_lsn(ip->i_mount,
+						ip->i_itemp->ili_last_lsn,
+						XFS_LOG_SYNC, &log_flushed);
+			} else {
+				error = _xfs_log_force(ip->i_mount,
+						XFS_LOG_SYNC, &log_flushed);
+			}
 		}
 	} else	{
 		/*
-- 
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