5056 ZFS deadlock on db_mtx and dn_holds
Reviewed by: Will Andrews <willa@spectralogic.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Dan McDonald <danmcd@omniti.com>

*** 19,28 ****
--- 19,29 ----
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2013 by Delphix. All rights reserved.
+  * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
   */
  
  #ifndef _SYS_SA_IMPL_H
  #define _SYS_SA_IMPL_H
  
*** 208,217 ****
--- 209,219 ----
   *
   * This needs to be kept as small as possible.
   */
  
  struct sa_handle {
+         dmu_buf_user_t  sa_dbu;
          kmutex_t        sa_lock;
          dmu_buf_t       *sa_bonus;
          dmu_buf_t       *sa_spill;
          objset_t        *sa_os;
          void            *sa_userp;