extern int volume_id_probe_netware(struct volume_id *id, uint64_t off, uint64_t size);
extern int volume_id_probe_gfs(struct volume_id *id, uint64_t off, uint64_t size);
extern int volume_id_probe_gfs2(struct volume_id *id, uint64_t off, uint64_t size);
extern int volume_id_probe_netware(struct volume_id *id, uint64_t off, uint64_t size);
extern int volume_id_probe_gfs(struct volume_id *id, uint64_t off, uint64_t size);
extern int volume_id_probe_gfs2(struct volume_id *id, uint64_t off, uint64_t size);