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diff --git a/servers/slapd/back-mdb/proto-mdb.h b/servers/slapd/back-mdb/proto-mdb.h
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+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2000-2022 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>.
+ */
+
+#ifndef _PROTO_MDB_H
+#define _PROTO_MDB_H
+
+LDAP_BEGIN_DECL
+
+#define MDB_UCTYPE "MDB"
+
+/*
+ * attr.c
+ */
+
+AttrInfo *mdb_attr_mask( struct mdb_info *mdb,
+ AttributeDescription *desc );
+
+void mdb_attr_flush( struct mdb_info *mdb );
+
+int mdb_attr_slot( struct mdb_info *mdb,
+ AttributeDescription *desc, int *insert );
+
+int mdb_attr_dbs_open( BackendDB *be, MDB_txn *txn, struct config_reply_s *cr );
+void mdb_attr_dbs_close( struct mdb_info *mdb );
+
+int mdb_attr_index_config LDAP_P(( struct mdb_info *mdb,
+ const char *fname, int lineno,
+ int argc, char **argv, struct config_reply_s *cr ));
+
+void mdb_attr_index_unparse LDAP_P(( struct mdb_info *mdb, BerVarray *bva ));
+void mdb_attr_index_destroy LDAP_P(( struct mdb_info *mdb ));
+void mdb_attr_index_free LDAP_P(( struct mdb_info *mdb,
+ AttributeDescription *ad ));
+
+int mdb_attr_multi_config LDAP_P(( struct mdb_info *mdb,
+ const char *fname, int lineno,
+ int argc, char **argv, struct config_reply_s *cr ));
+
+void mdb_attr_multi_unparse LDAP_P(( struct mdb_info *mdb, BerVarray *bva ));
+
+void mdb_attr_multi_thresh LDAP_P(( struct mdb_info *mdb, AttributeDescription *ad,
+ unsigned *hi, unsigned *lo ));
+
+void mdb_attr_info_free( AttrInfo *ai );
+
+int mdb_ad_read( struct mdb_info *mdb, MDB_txn *txn );
+int mdb_ad_get( struct mdb_info *mdb, MDB_txn *txn, AttributeDescription *ad );
+void mdb_ad_unwind( struct mdb_info *mdb, int prev_ads );
+
+/*
+ * config.c
+ */
+
+int mdb_back_init_cf( BackendInfo *bi );
+int mdb_resume_index( BackendDB *be, MDB_txn *txn );
+void mdb_start_index_task( BackendDB *be );
+
+/*
+ * dn2entry.c
+ */
+
+int mdb_dn2entry LDAP_P(( Operation *op, MDB_txn *tid, MDB_cursor *mc,
+ struct berval *dn, Entry **e, ID *nsubs, int matched ));
+
+/*
+ * dn2id.c
+ */
+
+int mdb_dn2id(
+ Operation *op,
+ MDB_txn *txn,
+ MDB_cursor *mc,
+ struct berval *ndn,
+ ID *id,
+ ID *nsubs,
+ struct berval *matched,
+ struct berval *nmatched );
+
+int mdb_dn2id_add(
+ Operation *op,
+ MDB_cursor *mcp,
+ MDB_cursor *mcd,
+ ID pid,
+ ID nsubs,
+ int upsub,
+ Entry *e );
+
+int mdb_dn2id_delete(
+ Operation *op,
+ MDB_cursor *mc,
+ ID id,
+ ID nsubs );
+
+int mdb_dn2id_children(
+ Operation *op,
+ MDB_txn *tid,
+ Entry *e );
+
+int mdb_dn2sups (
+ Operation *op,
+ MDB_txn *tid,
+ struct berval *dn,
+ ID *sups
+ );
+
+int mdb_dn2idl(
+ Operation *op,
+ MDB_txn *txn,
+ struct berval *ndn,
+ ID eid,
+ ID *ids,
+ ID *stack );
+
+int mdb_dn2id_parent(
+ Operation *op,
+ MDB_txn *txn,
+ ID eid,
+ ID *idp );
+
+int mdb_id2name(
+ Operation *op,
+ MDB_txn *txn,
+ MDB_cursor **cursp,
+ ID eid,
+ struct berval *name,
+ struct berval *nname);
+
+int mdb_idscope(
+ Operation *op,
+ MDB_txn *txn,
+ ID base,
+ ID *ids,
+ ID *res );
+
+struct IdScopes;
+
+int mdb_idscopes(
+ Operation *op,
+ struct IdScopes *isc );
+
+int mdb_idscopechk(
+ Operation *op,
+ struct IdScopes *isc );
+
+int mdb_dn2id_walk(
+ Operation *op,
+ struct IdScopes *isc );
+
+void mdb_dn2id_wrestore(
+ Operation *op,
+ struct IdScopes *isc );
+
+MDB_cmp_func mdb_dup_compare;
+
+/*
+ * filterentry.c
+ */
+
+int mdb_filter_candidates(
+ Operation *op,
+ MDB_txn *txn,
+ Filter *f,
+ ID *ids,
+ ID *tmp,
+ ID *stack );
+
+/*
+ * id2entry.c
+ */
+
+MDB_cmp_func mdb_id2v_compare;
+MDB_cmp_func mdb_id2v_dupsort;
+
+int mdb_id2entry_add(
+ Operation *op,
+ MDB_txn *tid,
+ MDB_cursor *mc,
+ Entry *e );
+
+int mdb_id2entry_update(
+ Operation *op,
+ MDB_txn *tid,
+ MDB_cursor *mc,
+ Entry *e );
+
+int mdb_id2entry_delete(
+ BackendDB *be,
+ MDB_txn *tid,
+ Entry *e);
+
+int mdb_id2entry(
+ Operation *op,
+ MDB_cursor *mc,
+ ID id,
+ Entry **e);
+
+int mdb_id2edata(
+ Operation *op,
+ MDB_cursor *mc,
+ ID id,
+ MDB_val *data);
+
+int mdb_entry_return( Operation *op, Entry *e );
+BI_entry_release_rw mdb_entry_release;
+BI_entry_get_rw mdb_entry_get;
+BI_op_txn mdb_txn;
+
+int mdb_entry_decode( Operation *op, MDB_txn *txn, MDB_val *data, ID id, Entry **e );
+
+void mdb_reader_flush( MDB_env *env );
+int mdb_opinfo_get( Operation *op, struct mdb_info *mdb, int rdonly, mdb_op_info **moi );
+
+int mdb_mval_put(Operation *op, MDB_cursor *mc, ID id, Attribute *a);
+int mdb_mval_del(Operation *op, MDB_cursor *mc, ID id, Attribute *a);
+
+/*
+ * idl.c
+ */
+
+unsigned mdb_idl_search( ID *ids, ID id );
+
+int mdb_idl_fetch_key(
+ BackendDB *be,
+ MDB_txn *txn,
+ MDB_dbi dbi,
+ MDB_val *key,
+ ID *ids,
+ MDB_cursor **saved_cursor,
+ int get_flag );
+
+int mdb_idl_insert( ID *ids, ID id );
+
+typedef int (mdb_idl_keyfunc)(
+ BackendDB *be,
+ MDB_cursor *mc,
+ struct berval *key,
+ ID id );
+
+mdb_idl_keyfunc mdb_idl_insert_keys;
+mdb_idl_keyfunc mdb_idl_delete_keys;
+
+int
+mdb_idl_intersection(
+ ID *a,
+ ID *b );
+
+int
+mdb_idl_union(
+ ID *a,
+ ID *b );
+
+ID mdb_idl_first( ID *ids, ID *cursor );
+ID mdb_idl_next( ID *ids, ID *cursor );
+
+void mdb_idl_sort( ID *ids, ID *tmp );
+int mdb_idl_append( ID *a, ID *b );
+int mdb_idl_append_one( ID *ids, ID id );
+
+
+/*
+ * index.c
+ */
+
+extern AttrInfo *
+mdb_index_mask LDAP_P((
+ Backend *be,
+ AttributeDescription *desc,
+ struct berval *name ));
+
+extern int
+mdb_index_param LDAP_P((
+ Backend *be,
+ AttributeDescription *desc,
+ int ftype,
+ MDB_dbi *dbi,
+ slap_mask_t *mask,
+ struct berval *prefix ));
+
+extern int
+mdb_index_values LDAP_P((
+ Operation *op,
+ MDB_txn *txn,
+ AttributeDescription *desc,
+ BerVarray vals,
+ ID id,
+ int opid ));
+
+extern int
+mdb_index_recset LDAP_P((
+ struct mdb_info *mdb,
+ Attribute *a,
+ AttributeType *type,
+ struct berval *tags,
+ IndexRec *ir ));
+
+extern int
+mdb_index_recrun LDAP_P((
+ Operation *op,
+ MDB_txn *txn,
+ struct mdb_info *mdb,
+ IndexRec *ir,
+ ID id,
+ int base ));
+
+int mdb_index_entry LDAP_P(( Operation *op, MDB_txn *t, int r, Entry *e ));
+
+#define mdb_index_entry_add(op,t,e) \
+ mdb_index_entry((op),(t),SLAP_INDEX_ADD_OP,(e))
+#define mdb_index_entry_del(op,t,e) \
+ mdb_index_entry((op),(t),SLAP_INDEX_DELETE_OP,(e))
+
+/*
+ * key.c
+ */
+
+extern int
+mdb_key_read(
+ Backend *be,
+ MDB_txn *txn,
+ MDB_dbi dbi,
+ struct berval *k,
+ ID *ids,
+ MDB_cursor **saved_cursor,
+ int get_flags );
+
+/*
+ * nextid.c
+ */
+
+int mdb_next_id( BackendDB *be, MDB_cursor *mc, ID *id );
+
+/*
+ * modify.c
+ */
+
+int mdb_modify_internal(
+ Operation *op,
+ MDB_txn *tid,
+ Modifications *modlist,
+ Entry *e,
+ const char **text,
+ char *textbuf,
+ size_t textlen );
+
+/*
+ * monitor.c
+ */
+
+int mdb_monitor_db_init( BackendDB *be );
+int mdb_monitor_db_open( BackendDB *be );
+int mdb_monitor_db_close( BackendDB *be );
+int mdb_monitor_db_destroy( BackendDB *be );
+
+#ifdef MDB_MONITOR_IDX
+int
+mdb_monitor_idx_add(
+ struct mdb_info *mdb,
+ AttributeDescription *desc,
+ slap_mask_t type );
+#endif /* MDB_MONITOR_IDX */
+
+/*
+ * former external.h
+ */
+
+extern BI_init mdb_back_initialize;
+
+extern BI_db_config mdb_db_config;
+
+extern BI_op_add mdb_add;
+extern BI_op_bind mdb_bind;
+extern BI_op_compare mdb_compare;
+extern BI_op_delete mdb_delete;
+extern BI_op_modify mdb_modify;
+extern BI_op_modrdn mdb_modrdn;
+extern BI_op_search mdb_search;
+extern BI_op_extended mdb_extended;
+
+extern BI_chk_referrals mdb_referrals;
+
+extern BI_operational mdb_operational;
+
+extern BI_has_subordinates mdb_hasSubordinates;
+
+/* tools.c */
+extern BI_tool_entry_open mdb_tool_entry_open;
+extern BI_tool_entry_close mdb_tool_entry_close;
+extern BI_tool_entry_first_x mdb_tool_entry_first_x;
+extern BI_tool_entry_next mdb_tool_entry_next;
+extern BI_tool_entry_get mdb_tool_entry_get;
+extern BI_tool_entry_put mdb_tool_entry_put;
+extern BI_tool_entry_reindex mdb_tool_entry_reindex;
+extern BI_tool_dn2id_get mdb_tool_dn2id_get;
+extern BI_tool_entry_modify mdb_tool_entry_modify;
+extern BI_tool_entry_delete mdb_tool_entry_delete;
+
+extern mdb_idl_keyfunc mdb_tool_idl_add;
+
+LDAP_END_DECL
+
+#endif /* _PROTO_MDB_H */