diff -urN linux/fs/locks.c linux-GFS/fs/locks.c
--- linux/fs/locks.c	Mon Aug  9 14:05:02 1999
+++ linux-GFS/fs/locks.c	Wed Nov 10 07:01:27 1999
@@ -307,6 +307,12 @@
 	error = -EBADF;
 	if ((file_lock.fl_type != F_UNLCK) && !(filp->f_mode & 3))
 		goto out_putf;
+	if( filp->f_op->lock ) {
+		error = filp->f_op->lock(filp,
+			(((cmd&LOCK_NB)==LOCK_NB)?F_SETLK:F_SETLKW),
+			&file_lock);
+		if(error <0) goto out_putf;
+	}
 	error = flock_lock_file(filp, &file_lock,
 				(cmd & (LOCK_UN | LOCK_NB)) ? 0 : 1);
 out_putf: