Use the LZ4 algorithm to compress metadata when the corresponding feature is enabled

@@ -25,10 +25,11 @@
  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  * Copyright (c) 2014, Joyent, Inc. All rights reserved.
  * Copyright (c) 2013 by Delphix. All rights reserved.
  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
  * Copyright (c) 2013 Steven Hartland. All rights reserved.
+ * Copyright (c) 2014, Nexenta Systems, Inc. All rights reserved.
  */
 
 /*
  * ZFS ioctls.
  *

@@ -2451,41 +2452,10 @@
                         (void) zfs_ioc_userspace_upgrade(zc);
                         kmem_free(zc, sizeof (zfs_cmd_t));
                 }
                 break;
         }
-        case ZFS_PROP_COMPRESSION:
-        {
-                if (intval == ZIO_COMPRESS_LZ4) {
-                        spa_t *spa;
-
-                        if ((err = spa_open(dsname, &spa, FTAG)) != 0)
-                                return (err);
-
-                        /*
-                         * Setting the LZ4 compression algorithm activates
-                         * the feature.
-                         */
-                        if (!spa_feature_is_active(spa,
-                            SPA_FEATURE_LZ4_COMPRESS)) {
-                                if ((err = zfs_prop_activate_feature(spa,
-                                    SPA_FEATURE_LZ4_COMPRESS)) != 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;
-        }
-
         default:
                 err = -1;
         }
 
         return (err);