+int osd_fld_lookup(const struct lu_env *env, struct osd_device *osd,
+ u64 seq, struct lu_seq_range *range);
+void osd_zap_cursor_init_serialized(zap_cursor_t *zc, struct objset *os,
+ uint64_t id, uint64_t dirhash);
+int osd_zap_cursor_init(zap_cursor_t **zc, struct objset *os,
+ uint64_t id, uint64_t dirhash);
+void osd_zap_cursor_fini(zap_cursor_t *zc);
+uint64_t osd_zap_cursor_serialize(zap_cursor_t *zc);