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>

@@ -20,11 +20,11 @@
  */
 
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
- * Copyright (c) 2012 by Delphix. All rights reserved.
+ * Copyright (c) 2013 by Delphix. All rights reserved.
  * Copyright (c) 2012 by Frederik Wessels. All rights reserved.
  * Copyright (c) 2013 by Prasad Joshi (sTec). All rights reserved.
  */
 
 #include <assert.h>

@@ -874,11 +874,11 @@
         } else {
                 /*
                  * Hand off to libzfs.
                  */
                 if (enable_all_pool_feat) {
-                        int i;
+                        spa_feature_t i;
                         for (i = 0; i < SPA_FEATURES; i++) {
                                 char propname[MAXPATHLEN];
                                 zfeature_info_t *feat = &spa_feature_table[i];
 
                                 (void) snprintf(propname, sizeof (propname),