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

@@ -21,10 +21,11 @@
 
 /*
  * Copyright (c) 2013 by Delphix. All rights reserved.
  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
  * Copyright (c) 2013, Joyent, Inc. All rights reserved.
+ * Copyright (c) 2014, Nexenta Systems, Inc. All rights reserved.
  */
 
 #ifdef _KERNEL
 #include <sys/systm.h>
 #else

@@ -167,11 +168,11 @@
             B_FALSE, NULL);
 
         zfeature_register(SPA_FEATURE_LZ4_COMPRESS,
             "org.illumos:lz4_compress", "lz4_compress",
             "LZ4 compression algorithm support.", B_FALSE, B_FALSE,
-            B_FALSE, NULL);
+            B_TRUE, NULL);
 
         zfeature_register(SPA_FEATURE_MULTI_VDEV_CRASH_DUMP,
             "com.joyent:multi_vdev_crash_dump", "multi_vdev_crash_dump",
             "Crash dumps to multiple vdev pools.", B_FALSE, B_FALSE,
             B_FALSE, NULL);