+struct volume_id;
+typedef int (*volume_id_probe_fn_t)(struct volume_id *id, uint64_t off, uint64_t size);
+typedef int (*all_probers_fn_t)(volume_id_probe_fn_t probe_fn,
+ struct volume_id *id, uint64_t off, uint64_t size,
+ void *data);
+
+extern struct volume_id *volume_id_open_fd(int fd);
+extern void volume_id_close(struct volume_id *id);
+extern int volume_id_probe_filesystem(struct volume_id *id, uint64_t off, uint64_t size);
+extern int volume_id_probe_raid(struct volume_id *id, uint64_t off, uint64_t size);
+extern int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size);
+extern const volume_id_probe_fn_t *volume_id_get_prober_by_type(const char *type);
+extern void volume_id_all_probers(all_probers_fn_t all_probers_fn,
+ struct volume_id *id, uint64_t off, uint64_t size,
+ void *data);
+extern int volume_id_get_label(struct volume_id *id, const char **label);
+extern int volume_id_get_label_raw(struct volume_id *id, const uint8_t **label, size_t *len);
+extern int volume_id_get_uuid(struct volume_id *id, const char **uuid);
+extern int volume_id_get_uuid_raw(struct volume_id *id, const uint8_t **uuid, size_t *len);
+extern int volume_id_get_usage(struct volume_id *id, const char **usage);
+extern int volume_id_get_type(struct volume_id *id, const char **type);
+extern int volume_id_get_type_version(struct volume_id *id, const char **type_version);
+extern int volume_id_encode_string(const char *str, char *str_enc, size_t len);
+
+/*
+ * Note: everything below will be made private or removed from
+ * a future version, and a new major release of libvolume_id
+ */
+
+extern struct volume_id *volume_id_open_node(const char *path);
+