3756 want lz4 support for metadata compression

@@ -19,10 +19,11 @@
  * CDDL HEADER END
  */
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2013 by Delphix. All rights reserved.
+ * Copyright (c) 2013 Martin Matuska. All rights reserved.
  */
 
 /* Portions Copyright 2010 Robert Milkowski */
 
 #include <sys/cred.h>

@@ -986,11 +987,11 @@
         SET_BOOKMARK(&zb, os->os_dsl_dataset ?
             os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
             ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
         arc_release(os->os_phys_buf, &os->os_phys_buf);
 
-        dmu_write_policy(os, NULL, 0, 0, &zp);
+        dmu_write_policy(os, NULL, 0, 0, &zp, tx->tx_txg);
 
         zio = arc_write(pio, os->os_spa, tx->tx_txg,
             os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), &zp,
             dmu_objset_write_ready, dmu_objset_write_done, os,
             ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);