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diff --git a/storage/maria/trnman.h b/storage/maria/trnman.h
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+/* Copyright (C) 2006-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#ifndef _trnman_h
+#define _trnman_h
+
+C_MODE_START
+
+#include <lf.h>
+#include "trnman_public.h"
+#include "ma_loghandler_lsn.h"
+
+/**
+  trid - 6 uchar transaction identifier. Assigned when a transaction
+  is created. Transaction can always be identified by its trid,
+  even after transaction has ended.
+
+  short_id - 2-byte transaction identifier, identifies a running
+  transaction, is reassigned when transaction ends.
+
+  when short_id is 0, TRN is not initialized, for all practical purposes
+  it could be considered unused.
+
+  when commit_trid is MAX_TRID the transaction is running, otherwise it's
+  committed.
+
+  state_lock mutex protects the state of a TRN, that is whether a TRN
+  is committed/running/unused. Meaning that modifications of short_id and
+  commit_trid happen under this mutex.
+*/
+
+struct st_ma_transaction
+{
+  LF_PINS              *pins;
+  WT_THD               *wt;
+  pthread_mutex_t      state_lock;
+  void                 *used_tables;  /**< Tables used by transaction */
+  TRN                  *next, *prev;
+  TrID                 trid, min_read_from, commit_trid;
+  LSN		       rec_lsn, undo_lsn;
+  LSN_WITH_FLAGS       first_undo_lsn;
+  uint                 locked_tables;
+  uint16               short_id;
+  uint16               flags;         /**< Various flags */
+};
+
+#define TRANSACTION_LOGGED_LONG_ID ULL(0x8000000000000000)
+#define MAX_TRID (~(TrID)0)
+
+extern WT_RESOURCE_TYPE ma_rc_dup_unique;
+
+C_MODE_END
+
+#endif
+