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diff --git a/servers/slapd/back-wt/back-wt.h b/servers/slapd/back-wt/back-wt.h
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+/* OpenLDAP WiredTiger backend */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2002-2022 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* ACKNOWLEDGEMENTS:
+ * This work was developed by HAMANO Tsukasa <hamano@osstech.co.jp>
+ * based on back-bdb for inclusion in OpenLDAP Software.
+ * WiredTiger is a product of MongoDB Inc.
+ */
+
+#ifndef _BACK_WT_H_
+#define _BACK_WT_H_
+
+#include <portable.h>
+
+#include <ac/errno.h>
+#include <sys/stat.h>
+
+#include "slap.h"
+#include "wiredtiger.h"
+
+/* The default search IDL stack cache depth */
+#define DEFAULT_SEARCH_STACK_DEPTH  16
+
+#define WT_CONFIG_MAX 2048
+
+struct wt_info {
+	WT_CONNECTION *wi_conn;
+	WT_CONNECTION *wi_cache;
+	char *wi_home;
+	char *wi_config;
+	ID	wi_lastid;
+
+	slap_mask_t wi_defaultmask;
+	int         wi_nattrs;
+	struct wt_attrinfo **wi_attrs;
+	void *wi_search_stack;
+	int wi_search_stack_depth;
+
+	struct re_s *wi_index_task;
+
+	int wi_flags;
+#define WT_IS_OPEN      0x01
+#define WT_OPEN_INDEX   0x02
+#define WT_DEL_INDEX    0x08
+#define WT_RE_OPEN      0x10
+#define WT_NEED_UPGRADE 0x20
+#define WT_USE_IDLCACHE 0x40
+};
+
+#define WT_TABLE_ID2ENTRY "table:id2entry"
+#define WT_TABLE_DN2ID "table:dn2id"
+
+#define WT_INDEX_DN "index:id2entry:dn"
+#define WT_INDEX_NDN "index:dn2id:ndn"
+#define WT_INDEX_PID "index:dn2id:pid"
+/* Currently, revdn is primary key, the revdn index is obsolete. */
+#define WT_INDEX_REVDN "index:dn2id:revdn"
+
+/* table for cache */
+#define WT_TABLE_IDLCACHE "table:idlcache"
+
+#define ITEMzero(item) (memset((item), 0, sizeof(WT_ITEM)))
+#define ITEM2bv(item,bv) ((bv)->bv_val = (item)->data, \
+						  (bv)->bv_len = (item)->size)
+#define bv2ITEM(bv,item) ((item)->data = (bv)->bv_val, \
+						 (item)->size = (bv)->bv_len )
+
+#define WT_INDEX_CACHE_SIZE 1024
+
+typedef struct {
+	WT_SESSION *session;
+	int is_begin_transaction;
+	WT_CURSOR *dn2id;
+	WT_CURSOR *dn2id_w;
+	WT_CURSOR *dn2id_ndn;
+	WT_CURSOR *dn2entry;
+	WT_CURSOR *id2entry;
+	WT_CURSOR *id2entry_add;
+	WT_CURSOR *id2entry_update;
+	WT_SESSION *idlcache_session;
+	WT_CURSOR *index_pid;
+} wt_ctx;
+
+/* for the cache of attribute information (which are indexed, etc.) */
+typedef struct wt_attrinfo {
+	AttributeDescription *ai_desc; /* attribute description cn;lang-en */
+	slap_mask_t ai_indexmask;   /* how the attr is indexed  */
+	slap_mask_t ai_newmask; /* new settings to replace old mask */
+	#ifdef LDAP_COMP_MATCH
+	ComponentReference* ai_cr; /*component indexing*/
+	#endif
+} AttrInfo;
+
+/* These flags must not clash with SLAP_INDEX flags or ops in slap.h! */
+#define	WT_INDEX_DELETING	0x8000U	/* index is being modified */
+#define	WT_INDEX_UPDATE_OP	0x03	/* performing an index update */
+
+#include "proto-wt.h"
+
+#endif /* _BACK_WT_H_ */
+
+/*
+ * Local variables:
+ * indent-tabs-mode: t
+ * tab-width: 4
+ * c-basic-offset: 4
+ * End:
+ */