InnoDB: Truncate "<datadir>/innodb.status.<pid>" to its actual size

(Bug #3596)

innobase/srv/srv0srv.c

@@ -1609,6 +1609,11 @@ loop:
 	    mutex_enter(&srv_monitor_file_mutex);
 	    rewind(srv_monitor_file);
 	    srv_printf_innodb_monitor(srv_monitor_file);
+#ifdef __WIN__
+	    chsize(fileno(srv_monitor_file), ftell(srv_monitor_file));
+#else /* __WIN__ */
+	    ftruncate(fileno(srv_monitor_file), ftell(srv_monitor_file));
+#endif /* __WIN__ */
 	    mutex_exit(&srv_monitor_file_mutex);
 
 	    if (srv_print_innodb_tablespace_monitor

sql/ha_innodb.cc

@@ -4648,6 +4648,11 @@ innodb_show_status(
 	rewind(srv_monitor_file);
 	srv_printf_innodb_monitor(srv_monitor_file);
 	flen = ftell(srv_monitor_file);
+#ifdef __WIN__
+	chsize(fileno(srv_monitor_file), flen);
+#else /* __WIN__ */
+	ftruncate(fileno(srv_monitor_file), flen);
+#endif /* __WIN__ */
 	if(flen > 64000 - 1) {
 		flen = 64000 - 1;
 	}