Integrated Edon-R hash function.

*** 2389,2398 ****
--- 2389,2432 ----
                          (void) zfs_ioc_userspace_upgrade(zc);
                          kmem_free(zc, sizeof (zfs_cmd_t));
                  }
                  break;
          }
+         case ZFS_PROP_CHECKSUM:
+         {
+                 if (intval == ZIO_CHECKSUM_EDONR512_256) {
+                         zfeature_info_t *feature =
+                             &spa_feature_table[SPA_FEATURE_EDONR_CKSUM];
+                         spa_t *spa;
+                         dsl_pool_t *dp;
+ 
+                         if ((err = spa_open(dsname, &spa, FTAG)) != 0)
+                                 return (err);
+ 
+                         dp = spa->spa_dsl_pool;
+ 
+                         /*
+                          * Setting the Edon-R checksum algorithm activates
+                          * the feature.
+                          */
+                         if (!spa_feature_is_active(spa, feature)) {
+                                 if ((err = zfs_prop_activate_feature(dp,
+                                     feature)) != 0) {
+                                         spa_close(spa, FTAG);
+                                         return (err);
+                                 }
+                         }
+ 
+                         spa_close(spa, FTAG);
+                 }
+                 /*
+                  * We still want the default set action to be performed in the
+                  * caller, we only performed zfeature settings here.
+                  */
+                 err = -1;
+                 break;
+         }
          case ZFS_PROP_COMPRESSION:
          {
                  if (intval == ZIO_COMPRESS_LZ4) {
                          zfeature_info_t *feature =
                              &spa_feature_table[SPA_FEATURE_LZ4_COMPRESS];
*** 3647,3656 ****
--- 3681,3709 ----
  
          /*
           * Check that this value is valid for this pool version
           */
          switch (prop) {
+         case ZFS_PROP_CHECKSUM:
+                 if (nvpair_type(pair) == DATA_TYPE_UINT64 &&
+                     nvpair_value_uint64(pair, &intval) == 0) {
+                         if (intval == ZIO_CHECKSUM_EDONR512_256) {
+                                 zfeature_info_t *feature =
+                                     &spa_feature_table[SPA_FEATURE_EDONR_CKSUM];
+                                 spa_t *spa;
+ 
+                                 if ((err = spa_open(dsname, &spa, FTAG)) != 0)
+                                         return (err);
+ 
+                                 if (!spa_feature_is_enabled(spa, feature)) {
+                                         spa_close(spa, FTAG);
+                                         return (ENOTSUP);
+                                 }
+                                 spa_close(spa, FTAG);
+                         }
+                 }
+                 break;
          case ZFS_PROP_COMPRESSION:
                  /*
                   * If the user specified gzip compression, make sure
                   * the SPA supports it. We ignore any errors here since
                   * we'll catch them later.