4171 clean up spa_feature_*() interfaces
4172 implement extensible_dataset feature for use by other zpool features
Reviewed by: Max Grossman <max.grossman@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>

@@ -139,10 +139,16 @@
     dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
 uint64_t zap_create_link(objset_t *os, dmu_object_type_t ot,
     uint64_t parent_obj, const char *name, dmu_tx_t *tx);
 
 /*
+ * Initialize an already-allocated object.
+ */
+void mzap_create_impl(objset_t *os, uint64_t obj, int normflags,
+    zap_flags_t flags, dmu_tx_t *tx);
+
+/*
  * Create a new zapobj with no attributes from the given (unallocated)
  * object number.
  */
 int zap_create_claim(objset_t *ds, uint64_t obj, dmu_object_type_t ot,
     dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);