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diff --git a/servers/slapd/back-mdb/operational.c b/servers/slapd/back-mdb/operational.c
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+/* operational.c - mdb backend operational attributes function */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2000-2018 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>.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/string.h>
+#include <ac/socket.h>
+
+#include "slap.h"
+#include "back-mdb.h"
+
+/*
+ * sets *hasSubordinates to LDAP_COMPARE_TRUE/LDAP_COMPARE_FALSE
+ * if the entry has children or not.
+ */
+int
+mdb_hasSubordinates(
+ Operation *op,
+ Entry *e,
+ int *hasSubordinates )
+{
+ struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
+ MDB_txn *rtxn;
+ mdb_op_info opinfo = {{{0}}}, *moi = &opinfo;
+ int rc;
+
+ assert( e != NULL );
+
+ rc = mdb_opinfo_get(op, mdb, 1, &moi);
+ switch(rc) {
+ case 0:
+ break;
+ default:
+ rc = LDAP_OTHER;
+ goto done;
+ }
+
+ rtxn = moi->moi_txn;
+
+ rc = mdb_dn2id_children( op, rtxn, e );
+
+ switch( rc ) {
+ case 0:
+ *hasSubordinates = LDAP_COMPARE_TRUE;
+ break;
+
+ case MDB_NOTFOUND:
+ *hasSubordinates = LDAP_COMPARE_FALSE;
+ rc = LDAP_SUCCESS;
+ break;
+
+ default:
+ Debug(LDAP_DEBUG_ARGS,
+ "<=- " LDAP_XSTRING(mdb_hasSubordinates)
+ ": has_children failed: %s (%d)\n",
+ mdb_strerror(rc), rc, 0 );
+ rc = LDAP_OTHER;
+ }
+
+done:;
+ if ( moi == &opinfo ) {
+ mdb_txn_reset( moi->moi_txn );
+ LDAP_SLIST_REMOVE( &op->o_extra, &moi->moi_oe, OpExtra, oe_next );
+ } else {
+ moi->moi_ref--;
+ }
+ return rc;
+}
+
+/*
+ * sets the supported operational attributes (if required)
+ */
+int
+mdb_operational(
+ Operation *op,
+ SlapReply *rs )
+{
+ Attribute **ap;
+
+ assert( rs->sr_entry != NULL );
+
+ for ( ap = &rs->sr_operational_attrs; *ap; ap = &(*ap)->a_next ) {
+ if ( (*ap)->a_desc == slap_schema.si_ad_hasSubordinates ) {
+ break;
+ }
+ }
+
+ if ( *ap == NULL &&
+ attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_hasSubordinates ) == NULL &&
+ ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
+ ad_inlist( slap_schema.si_ad_hasSubordinates, rs->sr_attrs ) ) )
+ {
+ int hasSubordinates, rc;
+
+ rc = mdb_hasSubordinates( op, rs->sr_entry, &hasSubordinates );
+ if ( rc == LDAP_SUCCESS ) {
+ *ap = slap_operational_hasSubordinate( hasSubordinates == LDAP_COMPARE_TRUE );
+ assert( *ap != NULL );
+
+ ap = &(*ap)->a_next;
+ }
+ }
+
+ return LDAP_SUCCESS;
+}
+