add w.Rotate

@@ -118,9 +118,9 @@ func (w *FileLogWriter) StartLogger() error {
 func (w *FileLogWriter) docheck(size int) {
 	w.startLock.Lock()
 	defer w.startLock.Unlock()
-	if (w.Maxlines > 0 && w.maxlines_curlines >= w.Maxlines) ||
+	if w.Rotate && ((w.Maxlines > 0 && w.maxlines_curlines >= w.Maxlines) ||
 		(w.Maxsize > 0 && w.maxsize_cursize >= w.Maxsize) ||
-		(w.Daily && time.Now().Day() != w.daily_opendate) {
+		(w.Daily && time.Now().Day() != w.daily_opendate)) {
 		if err := w.DoRotate(); err != nil {
 			fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.Filename, err)
 			return