return expire, nop
	}

	m, err := openMapped(name, f.meta, nil)
	if err != nil {
		// Mapping failed:
		// If there used to be a mapped file, after cleanup
		// incrementing counters will only change their internal state.
		// (before cleanup the existing mapped file would be updated)
		f.current.Store(nil) // invalidate the current mapping
		debugPrintf("rotate: openMapped: %v\n", err)
		return time.Time{}, cleanup
	}