4185 New hash algorithm support

*** 20,29 ****
--- 20,30 ----
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2013 by Delphix. All rights reserved.
   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
+  * Copyright 2013 Saso Kiselkov. All rights reserved.
   */
  
  #ifndef _SYS_SPA_IMPL_H
  #define _SYS_SPA_IMPL_H
  
*** 155,164 ****
--- 156,170 ----
          uint64_t        spa_config_object;      /* MOS object for pool config */
          uint64_t        spa_config_generation;  /* config generation number */
          uint64_t        spa_syncing_txg;        /* txg currently syncing */
          bpobj_t         spa_deferred_bpobj;     /* deferred-free bplist */
          bplist_t        spa_free_bplist[TXG_SIZE]; /* bplist of stuff to free */
+         zio_cksum_salt_t spa_cksum_salt;        /* secret salt for cksum */
+         uint64_t        spa_cksum_salt_obj;     /* persistent salt object */
+         /* checksum context templates */
+         kmutex_t        spa_cksum_tmpls_lock;
+         void            *spa_cksum_tmpls[ZIO_CHECKSUM_FUNCTIONS];
          uberblock_t     spa_ubsync;             /* last synced uberblock */
          uberblock_t     spa_uberblock;          /* current uberblock */
          boolean_t       spa_extreme_rewind;     /* rewind past deferred frees */
          uint64_t        spa_last_io;            /* lbolt of last non-scan I/O */
          kmutex_t        spa_scrub_lock;         /* resilver/scrub lock */