// If the tracker has been deleted an error is returned.
func (h *healingTracker) update(ctx context.Context) error {
	if h.disk.Healing() == nil {
		return fmt.Errorf("healingTracker: drive %q is not marked as healing", h.ID)
	}
	h.mu.Lock()
	if h.ID == "" || h.PoolIndex < 0 || h.SetIndex < 0 || h.DiskIndex < 0 {
		h.ID, _ = h.disk.GetDiskID()
		h.PoolIndex, h.SetIndex, h.DiskIndex = h.disk.GetDiskLoc()
	}