[PATCH] Restore an optimisation to locks.c

[Matthew Wilcox]

akpm reports that this optimisation I removed in 2.4.30 actually has
a noticeable impact.  Please apply:

diff -urpNX dontdiff linux-2.5.31/fs/locks.c linux-2.5.31-willy/fs/locks.c
--- linux-2.5.31/fs/locks.c	2002-08-01 14:16:39.000000000 -0700
+++ linux-2.5.31-willy/fs/locks.c	2002-08-21 08:29:29.000000000 -0700
@@ -1609,6 +1612,14 @@ void locks_remove_posix(struct file *fil
 {
 	struct file_lock lock;
 
+	/*
+	 * If there are no locks held on this file, we don't need to call
+	 * posix_lock_file().  Another process could be setting a lock on this
+	 * file at the same time, but we wouldn't remove that lock anyway.
+	 */
+	if (!filp->f_dentry->d_inode->i_flock)
+		return;
+
 	lock.fl_type = F_UNLCK;
 	lock.fl_flags = FL_POSIX;
 	lock.fl_start = 0;

-- 
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