VOLRES *reserve_volume(DCR *dcr, const char *VolumeName);
VOLRES *find_volume(const char *VolumeName);
bool free_volume(DEVICE *dev);
VOLRES *reserve_volume(DCR *dcr, const char *VolumeName);
VOLRES *find_volume(const char *VolumeName);
bool free_volume(DEVICE *dev);