s4-dsdb: pass parent request to dsdb_module_*() functions
[samba.git] / source4 / dsdb / samdb / ldb_modules / repl_meta_data.c
index 72ffd0e21cbf6cd2f68b5c668fd4191027468464..2cc52b9918b3173834f45c8283d1109d19e807e0 100644 (file)
@@ -1,21 +1,22 @@
-/* 
+/*
    ldb database library
 
    Copyright (C) Simo Sorce  2004-2008
    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
    Copyright (C) Andrew Tridgell 2005
    Copyright (C) Stefan Metzmacher <metze@samba.org> 2007
+   Copyright (C) Matthieu Patou <mat@samba.org> 2010
 
    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; either version 3 of the License, or
    (at your option) any later version.
-   
+
    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, see <http://www.gnu.org/licenses/>.
 */
 #include "librpc/gen_ndr/ndr_drsuapi.h"
 #include "librpc/gen_ndr/ndr_drsblobs.h"
 #include "param/param.h"
-#include "libcli/security/dom_sid.h"
+#include "libcli/security/security.h"
 #include "lib/util/dlinklist.h"
 #include "dsdb/samdb/ldb_modules/util.h"
 #include "lib/util/binsearch.h"
-#include "libcli/security/security.h"
+#include "libcli/security/session.h"
 #include "lib/util/tsort.h"
 
-#define W2K3_LINKED_ATTRIBUTES 1
-
 struct replmd_private {
        TALLOC_CTX *la_ctx;
        struct la_entry *la_list;
@@ -196,7 +195,7 @@ struct la_backlink {
   process a backlinks we accumulated during a transaction, adding and
   deleting the backlinks from the target objects
  */
-static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl)
+static int replmd_process_backlink(struct ldb_module *module, struct la_backlink *bl, struct ldb_request *parent)
 {
        struct ldb_dn *target_dn, *source_dn;
        int ret;
@@ -211,14 +210,14 @@ static int replmd_process_backlink(struct ldb_module *module, struct la_backlink
          - construct ldb_message
               - either an add or a delete
         */
-       ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn);
+       ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->target_guid, &target_dn, parent);
        if (ret != LDB_SUCCESS) {
                DEBUG(2,(__location__ ": WARNING: Failed to find target DN for linked attribute with GUID %s\n",
                         GUID_string(bl, &bl->target_guid)));
                return LDB_SUCCESS;
        }
 
-       ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn);
+       ret = dsdb_module_dn_by_guid(module, tmp_ctx, &bl->forward_guid, &source_dn, parent);
        if (ret != LDB_SUCCESS) {
                ldb_asprintf_errstring(ldb, "Failed to find source DN for linked attribute with GUID %s\n",
                                       GUID_string(bl, &bl->forward_guid));
@@ -248,7 +247,7 @@ static int replmd_process_backlink(struct ldb_module *module, struct la_backlink
        }
        msg->elements[0].flags = bl->active?LDB_FLAG_MOD_ADD:LDB_FLAG_MOD_DELETE;
 
-       ret = dsdb_module_modify(module, msg, 0);
+       ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE, parent);
        if (ret != LDB_SUCCESS) {
                ldb_asprintf_errstring(ldb, "Failed to %s backlink from %s to %s - %s",
                                       bl->active?"add":"remove",
@@ -336,7 +335,7 @@ static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_sche
        /* the caller may ask for this backlink to be processed
           immediately */
        if (immediate) {
-               int ret = replmd_process_backlink(module, bl);
+               int ret = replmd_process_backlink(module, bl, NULL);
                talloc_free(bl);
                return ret;
        }
@@ -349,7 +348,7 @@ static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_sche
 
 /*
  * Callback for most write operations in this module:
- * 
+ *
  * notify the repl task that a object has changed. The notifies are
  * gathered up in the replmd_private structure then written to the
  * @REPLCHANGED object in each partition during the prepare_commit
@@ -357,9 +356,9 @@ static int replmd_add_backlink(struct ldb_module *module, const struct dsdb_sche
 static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 {
        int ret;
-       struct replmd_replicated_request *ac = 
+       struct replmd_replicated_request *ac =
                talloc_get_type_abort(req->context, struct replmd_replicated_request);
-       struct replmd_private *replmd_private = 
+       struct replmd_private *replmd_private =
                talloc_get_type_abort(ldb_module_get_private(ac->module), struct replmd_private);
        struct nc_entry *modified_partition;
        struct ldb_control *partition_ctrl;
@@ -370,7 +369,7 @@ static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
        partition_ctrl = ldb_reply_get_control(ares, DSDB_CONTROL_CURRENT_PARTITION_OID);
 
        /* Remove the 'partition' control from what we pass up the chain */
-       controls = controls_except_specified(ares->controls, ares, partition_ctrl);
+       controls = ldb_controls_except_specified(ares->controls, ares, partition_ctrl);
 
        if (ares->error != LDB_SUCCESS) {
                return ldb_module_done(ac->req, controls,
@@ -391,15 +390,15 @@ static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
 
        partition = talloc_get_type_abort(partition_ctrl->data,
                                    struct dsdb_control_current_partition);
-       
+
        if (ac->seq_num > 0) {
-               for (modified_partition = replmd_private->ncs; modified_partition; 
+               for (modified_partition = replmd_private->ncs; modified_partition;
                     modified_partition = modified_partition->next) {
                        if (ldb_dn_compare(modified_partition->dn, partition->dn) == 0) {
                                break;
                        }
                }
-               
+
                if (modified_partition == NULL) {
                        modified_partition = talloc_zero(replmd_private, struct nc_entry);
                        if (!modified_partition) {
@@ -427,7 +426,7 @@ static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
        if (ac->apply_mode) {
                talloc_free(ares);
                ac->index_current++;
-               
+
                ret = replmd_replicated_apply_next(ac);
                if (ret != LDB_SUCCESS) {
                        return ldb_module_done(ac->req, NULL, NULL, ret);
@@ -438,8 +437,8 @@ static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
                 * common path.  Other cases will have it cleaned up
                 * eventually with the ares */
                talloc_free(partition_ctrl);
-               return ldb_module_done(ac->req, 
-                                      controls_except_specified(controls, ares, partition_ctrl),
+               return ldb_module_done(ac->req,
+                                      ldb_controls_except_specified(controls, ares, partition_ctrl),
                                       ares->response, LDB_SUCCESS);
        }
 }
@@ -449,7 +448,7 @@ static int replmd_op_callback(struct ldb_request *req, struct ldb_reply *ares)
  * update a @REPLCHANGED record in each partition if there have been
  * any writes of replicated data in the partition
  */
-static int replmd_notify_store(struct ldb_module *module)
+static int replmd_notify_store(struct ldb_module *module, struct ldb_request *parent)
 {
        struct replmd_private *replmd_private =
                talloc_get_type(ldb_module_get_private(module), struct replmd_private);
@@ -460,7 +459,7 @@ static int replmd_notify_store(struct ldb_module *module)
 
                ret = dsdb_module_save_partition_usn(module, modified_partition->dn,
                                                     modified_partition->mod_usn,
-                                                    modified_partition->mod_usn_urgent);
+                                                    modified_partition->mod_usn_urgent, parent);
                if (ret != LDB_SUCCESS) {
                        DEBUG(0,(__location__ ": Failed to save partition uSN for %s\n",
                                 ldb_dn_get_linearized(modified_partition->dn)));
@@ -512,6 +511,7 @@ static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 {
        struct ldb_message_element *el;
        char *s;
+       int ret;
 
        if (ldb_msg_find_element(msg, attr) != NULL) {
                return LDB_SUCCESS;
@@ -522,8 +522,9 @@ static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
                return LDB_ERR_OPERATIONS_ERROR;
        }
 
-       if (ldb_msg_add_string(msg, attr, s) != LDB_SUCCESS) {
-               return LDB_ERR_OPERATIONS_ERROR;
+       ret = ldb_msg_add_string(msg, attr, s);
+       if (ret != LDB_SUCCESS) {
+               return ret;
        }
 
        el = ldb_msg_find_element(msg, attr);
@@ -537,16 +538,19 @@ static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
 /*
   add a uint64_t element to a record
 */
-static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
+static int add_uint64_element(struct ldb_context *ldb, struct ldb_message *msg,
+                             const char *attr, uint64_t v)
 {
        struct ldb_message_element *el;
+       int ret;
 
        if (ldb_msg_find_element(msg, attr) != NULL) {
                return LDB_SUCCESS;
        }
 
-       if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != LDB_SUCCESS) {
-               return LDB_ERR_OPERATIONS_ERROR;
+       ret = samdb_msg_add_uint64(ldb, msg, msg, attr, v);
+       if (ret != LDB_SUCCESS) {
+               return ret;
        }
 
        el = ldb_msg_find_element(msg, attr);
@@ -602,10 +606,10 @@ static int replmd_replPropertyMetaDataCtr1_sort(struct replPropertyMetaDataCtr1
        rdn_sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
        if (rdn_sa == NULL) {
                DEBUG(0,(__location__ ": No sa found for rDN %s for %s\n", rdn_name, ldb_dn_get_linearized(dn)));
-               return LDB_ERR_OPERATIONS_ERROR;                
+               return LDB_ERR_OPERATIONS_ERROR;
        }
 
-       DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n", 
+       DEBUG(6,("Sorting rpmd with attid exception %u rDN=%s DN=%s\n",
                 rdn_sa->attributeID_id, rdn_name, ldb_dn_get_linearized(dn)));
 
        LDB_TYPESAFE_QSORT(ctr1->array, ctr1->count, &rdn_sa->attributeID_id, replmd_replPropertyMetaData1_attid_sort);
@@ -620,7 +624,7 @@ static int replmd_ldb_message_element_attid_sort(const struct ldb_message_elemen
        const struct dsdb_attribute *a1;
        const struct dsdb_attribute *a2;
 
-       /* 
+       /*
         * TODO: make this faster by caching the dsdb_attribute pointer
         *       on the ldb_messag_element
         */
@@ -659,7 +663,7 @@ static int replmd_build_la_val(TALLOC_CTX *mem_ctx, struct ldb_val *v, struct ds
  */
 static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_element *el,
                             uint64_t seq_num, const struct GUID *invocationId, time_t t,
-                            struct GUID *guid, const struct dsdb_attribute *sa)
+                            struct GUID *guid, const struct dsdb_attribute *sa, struct ldb_request *parent)
 {
        unsigned int i;
        TALLOC_CTX *tmp_ctx = talloc_new(el->values);
@@ -682,7 +686,7 @@ static int replmd_add_fix_la(struct ldb_module *module, struct ldb_message_eleme
                   components from the extended_dn_store module */
                status = dsdb_get_extended_dn_guid(dsdb_dn->dn, &target_guid, "GUID");
                if (!NT_STATUS_IS_OK(status) || GUID_all_zero(&target_guid)) {
-                       ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid);
+                       ret = dsdb_module_guid_by_dn(module, dsdb_dn->dn, &target_guid, parent);
                        if (ret != LDB_SUCCESS) {
                                talloc_free(tmp_ctx);
                                return ret;
@@ -734,6 +738,7 @@ static int replmd_add(struct ldb_module *module, struct ldb_request *req)
        char *time_str;
        int ret;
        unsigned int i;
+       unsigned int functional_level;
        uint32_t ni=0;
        bool allow_add_guid = false;
        bool remove_current_guid = false;
@@ -755,28 +760,22 @@ static int replmd_add(struct ldb_module *module, struct ldb_request *req)
 
        ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_add\n");
 
-       ac = replmd_ctx_init(module, req);
-       if (!ac) {
-               return LDB_ERR_OPERATIONS_ERROR;
-       }
-
-        guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
-       if ( guid_blob != NULL ) {
-               if( !allow_add_guid ) {
-                       ldb_debug_set(ldb, LDB_DEBUG_ERROR,
-                             "replmd_add: it's not allowed to add an object with objectGUID\n");
-                       talloc_free(ac);
+       guid_blob = ldb_msg_find_ldb_val(req->op.add.message, "objectGUID");
+       if (guid_blob != NULL) {
+               if (!allow_add_guid) {
+                       ldb_set_errstring(ldb,
+                                         "replmd_add: it's not allowed to add an object with objectGUID!");
                        return LDB_ERR_UNWILLING_TO_PERFORM;
                } else {
                        NTSTATUS status = GUID_from_data_blob(guid_blob,&guid);
-                       if ( !NT_STATUS_IS_OK(status)) {
-                                       ldb_debug_set(ldb, LDB_DEBUG_ERROR,
-                                     "replmd_add: Unable to parse as a GUID the attribute objectGUID\n");
-                               talloc_free(ac);
+                       if (!NT_STATUS_IS_OK(status)) {
+                               ldb_set_errstring(ldb,
+                                                 "replmd_add: Unable to parse the 'objectGUID' as a GUID!");
                                return LDB_ERR_UNWILLING_TO_PERFORM;
                        }
-                       /* we remove this attribute as it can be a string and will not be treated 
-                       correctly and then we will readd it latter on in the good format*/
+                       /* we remove this attribute as it can be a string and
+                        * will not be treated correctly and then we will re-add
+                        * it later on in the good format */
                        remove_current_guid = true;
                }
        } else {
@@ -784,6 +783,13 @@ static int replmd_add(struct ldb_module *module, struct ldb_request *req)
                guid = GUID_random();
        }
 
+       ac = replmd_ctx_init(module, req);
+       if (ac == NULL) {
+               return ldb_module_oom(module);
+       }
+
+       functional_level = dsdb_functional_level(ldb);
+
        /* Get a sequence number from the backend */
        ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &ac->seq_num);
        if (ret != LDB_SUCCESS) {
@@ -820,7 +826,7 @@ static int replmd_add(struct ldb_module *module, struct ldb_request *req)
                ldb_msg_remove_attr(msg,"objectGUID");
        }
 
-       /* 
+       /*
         * remove autogenerated attributes
         */
        ldb_msg_remove_attr(msg, "whenCreated");
@@ -875,9 +881,8 @@ static int replmd_add(struct ldb_module *module, struct ldb_request *req)
                        continue;
                }
 
-#if W2K3_LINKED_ATTRIBUTES
-               if (sa->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
-                       ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa);
+               if (sa->linkID != 0 && functional_level > DS_DOMAIN_FUNCTION_2000) {
+                       ret = replmd_add_fix_la(module, e, ac->seq_num, our_invocation_id, t, &guid, sa, req);
                        if (ret != LDB_SUCCESS) {
                                talloc_free(ac);
                                return ret;
@@ -886,7 +891,6 @@ static int replmd_add(struct ldb_module *module, struct ldb_request *req)
                           replPropertyMetaData in FL above w2k */
                        continue;
                }
-#endif
 
                m->attid                        = sa->attributeID_id;
                m->version                      = 1;
@@ -910,7 +914,7 @@ static int replmd_add(struct ldb_module *module, struct ldb_request *req)
        }
 
        /* generated NDR encoded values */
-       ndr_err = ndr_push_struct_blob(&nmd_value, msg, 
+       ndr_err = ndr_push_struct_blob(&nmd_value, msg,
                                       &nmd,
                                       (ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
        if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
@@ -969,11 +973,20 @@ static int replmd_add(struct ldb_module *module, struct ldb_request *req)
                                ac, replmd_op_callback,
                                req);
 
+       LDB_REQ_SET_LOCATION(down_req);
        if (ret != LDB_SUCCESS) {
                talloc_free(ac);
                return ret;
        }
 
+       if (functional_level == DS_DOMAIN_FUNCTION_2000) {
+               ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
+               if (ret != LDB_SUCCESS) {
+                       talloc_free(ac);
+                       return ret;
+               }
+       }
+
        /* mark the control done */
        if (control) {
                control->critical = 0;
@@ -1021,7 +1034,6 @@ static int replmd_update_rpmd_element(struct ldb_context *ldb,
                if (a->attributeID_id == omd->ctr.ctr1.array[i].attid) break;
        }
 
-#if W2K3_LINKED_ATTRIBUTES
        if (a->linkID != 0 && dsdb_functional_level(ldb) > DS_DOMAIN_FUNCTION_2000) {
                /* linked attributes are not stored in
                   replPropertyMetaData in FL above w2k, but we do
@@ -1032,11 +1044,10 @@ static int replmd_update_rpmd_element(struct ldb_context *ldb,
                }
                return LDB_SUCCESS;
        }
-#endif
 
        if (i == omd->ctr.ctr1.count) {
                /* we need to add a new one */
-               omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array, 
+               omd->ctr.ctr1.array = talloc_realloc(msg, omd->ctr.ctr1.array,
                                                     struct replPropertyMetaData1, omd->ctr.ctr1.count+1);
                if (omd->ctr.ctr1.array == NULL) {
                        ldb_oom(ldb);
@@ -1048,7 +1059,7 @@ static int replmd_update_rpmd_element(struct ldb_context *ldb,
 
        /* Get a new sequence number from the backend. We only do this
         * if we have a change that requires a new
-        * replPropertyMetaData element 
+        * replPropertyMetaData element
         */
        if (*seq_num == 0) {
                int ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, seq_num);
@@ -1064,17 +1075,31 @@ static int replmd_update_rpmd_element(struct ldb_context *ldb,
        md1->originating_invocation_id = *our_invocation_id;
        md1->originating_usn           = *seq_num;
        md1->local_usn                 = *seq_num;
-       
+
        return LDB_SUCCESS;
 }
 
+static uint64_t find_max_local_usn(struct replPropertyMetaDataBlob omd)
+{
+       uint32_t count = omd.ctr.ctr1.count;
+       uint64_t max = 0;
+       uint32_t i;
+       for (i=0; i < count; i++) {
+               struct replPropertyMetaData1 m = omd.ctr.ctr1.array[i];
+               if (max < m.local_usn) {
+                       max = m.local_usn;
+               }
+       }
+       return max;
+}
+
 /*
  * update the replPropertyMetaData object each time we modify an
  * object. This is needed for DRS replication, as the merge on the
- * client is based on this object 
+ * client is based on this object
  */
-static int replmd_update_rpmd(struct ldb_module *module, 
-                             const struct dsdb_schema *schema, 
+static int replmd_update_rpmd(struct ldb_module *module,
+                             const struct dsdb_schema *schema,
                              struct ldb_request *req,
                              struct ldb_message *msg, uint64_t *seq_num,
                              time_t t,
@@ -1088,11 +1113,12 @@ static int replmd_update_rpmd(struct ldb_module *module,
        const struct GUID *our_invocation_id;
        int ret;
        const char *attrs[] = { "replPropertyMetaData", "*", NULL };
+       const char *attrs2[] = { "uSNChanged", "objectClass", NULL };
        struct ldb_result *res;
        struct ldb_context *ldb;
        struct ldb_message_element *objectclass_el;
        enum urgent_situation situation;
-       bool rodc;
+       bool rodc, rmd_is_provided;
 
        ldb = ldb_module_get_ctx(module);
 
@@ -1106,20 +1132,10 @@ static int replmd_update_rpmd(struct ldb_module *module,
 
        unix_to_nt_time(&now, t);
 
-       /* search for the existing replPropertyMetaDataBlob. We need
-        * to use REVEAL and ask for DNs in storage format to support
-        * the check for values being the same in
-        * replmd_update_rpmd_element()
-        */
-       ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
-                                   DSDB_SEARCH_SHOW_DELETED |
-                                   DSDB_SEARCH_SHOW_EXTENDED_DN |
-                                   DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
-                                   DSDB_SEARCH_REVEAL_INTERNALS);
-       if (ret != LDB_SUCCESS || res->count != 1) {
-               DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
-                        ldb_dn_get_linearized(msg->dn)));
-               return LDB_ERR_OPERATIONS_ERROR;
+       if (ldb_request_get_control(req, DSDB_CONTROL_CHANGEREPLMETADATA_OID)) {
+               rmd_is_provided = true;
+       } else {
+               rmd_is_provided = false;
        }
 
        /* if isDeleted is present and is TRUE, then we consider we are deleting,
@@ -1130,62 +1146,126 @@ static int replmd_update_rpmd(struct ldb_module *module,
                situation = REPL_URGENT_ON_UPDATE;
        }
 
-       objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
-       if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
-                                                       situation)) {
-               *is_urgent = true;
-       }
+       if (rmd_is_provided) {
+               /* In this case the change_replmetadata control was supplied */
+               /* We check that it's the only attribute that is provided
+                * (it's a rare case so it's better to keep the code simplier)
+                * We also check that the highest local_usn is bigger than
+                * uSNChanged. */
+               uint64_t db_seq;
+               if( msg->num_elements != 1 ||
+                       strncmp(msg->elements[0].name,
+                               "replPropertyMetaData", 20) ) {
+                       DEBUG(0,(__location__ ": changereplmetada control called without "\
+                               "a specified replPropertyMetaData attribute or with others\n"));
+                       return LDB_ERR_OPERATIONS_ERROR;
+               }
+               if (situation == REPL_URGENT_ON_DELETE) {
+                       DEBUG(0,(__location__ ": changereplmetada control can't be called when deleting an object\n"));
+                       return LDB_ERR_OPERATIONS_ERROR;
+               }
+               omd_value = ldb_msg_find_ldb_val(msg, "replPropertyMetaData");
+               if (!omd_value) {
+                       DEBUG(0,(__location__ ": replPropertyMetaData was not specified for Object %s\n",
+                                ldb_dn_get_linearized(msg->dn)));
+                       return LDB_ERR_OPERATIONS_ERROR;
+               }
+               ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
+                                              (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
+               if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+                       DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
+                                ldb_dn_get_linearized(msg->dn)));
+                       return LDB_ERR_OPERATIONS_ERROR;
+               }
+               *seq_num = find_max_local_usn(omd);
 
-       omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
-       if (!omd_value) {
-               DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
-                        ldb_dn_get_linearized(msg->dn)));
-               return LDB_ERR_OPERATIONS_ERROR;
-       }
+               ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs2,
+                                           DSDB_FLAG_NEXT_MODULE |
+                                           DSDB_SEARCH_SHOW_RECYCLED |
+                                           DSDB_SEARCH_SHOW_EXTENDED_DN |
+                                           DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
+                                           DSDB_SEARCH_REVEAL_INTERNALS, req);
 
-       ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
-                                      (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
-       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
-               DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
-                        ldb_dn_get_linearized(msg->dn)));
-               return LDB_ERR_OPERATIONS_ERROR;
-       }
+               if (ret != LDB_SUCCESS || res->count != 1) {
+                       DEBUG(0,(__location__ ": Object %s failed to find uSNChanged\n",
+                                ldb_dn_get_linearized(msg->dn)));
+                       return LDB_ERR_OPERATIONS_ERROR;
+               }
 
-       if (omd.version != 1) {
-               DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
-                        omd.version, ldb_dn_get_linearized(msg->dn)));
-               return LDB_ERR_OPERATIONS_ERROR;
-       }
+               objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
+               if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
+                                                               situation)) {
+                       *is_urgent = true;
+               }
 
-       /*we have elements that will be modified*/
-       if (msg->num_elements > 0) {
-               /*if we are RODC and this is a DRSR update then its ok*/
-               if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
-                       ret = samdb_rodc(ldb, &rodc);
-                       if (ret != LDB_SUCCESS) {
-                               DEBUG(4, (__location__ ": unable to tell if we are an RODC\n"));
-                       } else if (rodc) {
-                               ldb_asprintf_errstring(ldb, "RODC modify is forbidden\n");
-                               return LDB_ERR_REFERRAL;
-                       }
+               db_seq = ldb_msg_find_attr_as_uint64(res->msgs[0], "uSNChanged", 0);
+               if (*seq_num <= db_seq) {
+                       DEBUG(0,(__location__ ": changereplmetada control provided but max(local_usn)"\
+                                             " is less or equal to uSNChanged (max = %lld uSNChanged = %lld)\n",
+                                (long long)*seq_num, (long long)db_seq));
+                       return LDB_ERR_OPERATIONS_ERROR;
                }
-       }
 
-       for (i=0; i<msg->num_elements; i++) {
-               struct ldb_message_element *old_el;
-               old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
-               ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
-                                                our_invocation_id, now);
-               if (ret != LDB_SUCCESS) {
-                       return ret;
+       } else {
+               /* search for the existing replPropertyMetaDataBlob. We need
+                * to use REVEAL and ask for DNs in storage format to support
+                * the check for values being the same in
+                * replmd_update_rpmd_element()
+                */
+               ret = dsdb_module_search_dn(module, msg, &res, msg->dn, attrs,
+                                           DSDB_FLAG_NEXT_MODULE |
+                                           DSDB_SEARCH_SHOW_RECYCLED |
+                                           DSDB_SEARCH_SHOW_EXTENDED_DN |
+                                           DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
+                                           DSDB_SEARCH_REVEAL_INTERNALS, req);
+               if (ret != LDB_SUCCESS || res->count != 1) {
+                       DEBUG(0,(__location__ ": Object %s failed to find replPropertyMetaData\n",
+                                ldb_dn_get_linearized(msg->dn)));
+                       return LDB_ERR_OPERATIONS_ERROR;
                }
 
-               if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
-                       *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
+               objectclass_el = ldb_msg_find_element(res->msgs[0], "objectClass");
+               if (is_urgent && replmd_check_urgent_objectclass(objectclass_el,
+                                                               situation)) {
+                       *is_urgent = true;
                }
 
-       }
+               omd_value = ldb_msg_find_ldb_val(res->msgs[0], "replPropertyMetaData");
+               if (!omd_value) {
+                       DEBUG(0,(__location__ ": Object %s does not have a replPropertyMetaData attribute\n",
+                                ldb_dn_get_linearized(msg->dn)));
+                       return LDB_ERR_OPERATIONS_ERROR;
+               }
+
+               ndr_err = ndr_pull_struct_blob(omd_value, msg, &omd,
+                                              (ndr_pull_flags_fn_t)ndr_pull_replPropertyMetaDataBlob);
+               if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+                       DEBUG(0,(__location__ ": Failed to parse replPropertyMetaData for %s\n",
+                                ldb_dn_get_linearized(msg->dn)));
+                       return LDB_ERR_OPERATIONS_ERROR;
+               }
+
+               if (omd.version != 1) {
+                       DEBUG(0,(__location__ ": bad version %u in replPropertyMetaData for %s\n",
+                                omd.version, ldb_dn_get_linearized(msg->dn)));
+                       return LDB_ERR_OPERATIONS_ERROR;
+               }
+
+               for (i=0; i<msg->num_elements; i++) {
+                       struct ldb_message_element *old_el;
+                       old_el = ldb_msg_find_element(res->msgs[0], msg->elements[i].name);
+                       ret = replmd_update_rpmd_element(ldb, msg, &msg->elements[i], old_el, &omd, schema, seq_num,
+                                                        our_invocation_id, now);
+                       if (ret != LDB_SUCCESS) {
+                               return ret;
+                       }
 
+                       if (is_urgent && !*is_urgent && (situation == REPL_URGENT_ON_UPDATE)) {
+                               *is_urgent = replmd_check_urgent_attribute(&msg->elements[i]);
+                       }
+
+               }
+       }
        /*
         * replmd_update_rpmd_element has done an update if the
         * seq_num is set
@@ -1194,6 +1274,17 @@ static int replmd_update_rpmd(struct ldb_module *module,
                struct ldb_val *md_value;
                struct ldb_message_element *el;
 
+               /*if we are RODC and this is a DRSR update then its ok*/
+               if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) {
+                       ret = samdb_rodc(ldb, &rodc);
+                       if (ret != LDB_SUCCESS) {
+                               DEBUG(4, (__location__ ": unable to tell if we are an RODC\n"));
+                       } else if (rodc) {
+                               ldb_asprintf_errstring(ldb, "RODC modify is forbidden\n");
+                               return LDB_ERR_REFERRAL;
+                       }
+               }
+
                md_value = talloc(msg, struct ldb_val);
                if (md_value == NULL) {
                        ldb_oom(ldb);
@@ -1224,7 +1315,7 @@ static int replmd_update_rpmd(struct ldb_module *module,
                el->values = md_value;
        }
 
-       return LDB_SUCCESS;     
+       return LDB_SUCCESS;
 }
 
 struct parsed_dn {
@@ -1238,13 +1329,15 @@ static int parsed_dn_compare(struct parsed_dn *pdn1, struct parsed_dn *pdn2)
        return GUID_compare(pdn1->guid, pdn2->guid);
 }
 
-static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct GUID *guid, struct ldb_dn *dn)
+static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn,
+                                       unsigned int count, struct GUID *guid,
+                                       struct ldb_dn *dn)
 {
        struct parsed_dn *ret;
+       unsigned int i;
        if (dn && GUID_all_zero(guid)) {
                /* when updating a link using DRS, we sometimes get a
                   NULL GUID. We then need to try and match by DN */
-               int i;
                for (i=0; i<count; i++) {
                        if (ldb_dn_compare(pdn[i].dsdb_dn->dn, dn) == 0) {
                                dsdb_get_extended_dn_guid(pdn[i].dsdb_dn->dn, guid, "GUID");
@@ -1263,7 +1356,7 @@ static struct parsed_dn *parsed_dn_find(struct parsed_dn *pdn, int count, struct
  */
 static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
                          struct ldb_message_element *el, struct parsed_dn **pdn,
-                         const char *ldap_oid)
+                         const char *ldap_oid, struct ldb_request *parent)
 {
        unsigned int i;
        struct ldb_context *ldb = ldb_module_get_ctx(module);
@@ -1303,7 +1396,7 @@ static int get_parsed_dns(struct ldb_module *module, TALLOC_CTX *mem_ctx,
                status = dsdb_get_extended_dn_guid(dn, p->guid, "GUID");
                if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
                        /* we got a DN without a GUID - go find the GUID */
-                       int ret = dsdb_module_guid_by_dn(module, dn, p->guid);
+                       int ret = dsdb_module_guid_by_dn(module, dn, p->guid, parent);
                        if (ret != LDB_SUCCESS) {
                                ldb_asprintf_errstring(ldb, "Unable to find GUID for DN %s\n",
                                                       ldb_dn_get_linearized(dn));
@@ -1556,7 +1649,8 @@ static int replmd_modify_la_add(struct ldb_module *module,
                                const struct dsdb_attribute *schema_attr,
                                uint64_t seq_num,
                                time_t t,
-                               struct GUID *msg_guid)
+                               struct GUID *msg_guid,
+                               struct ldb_request *parent)
 {
        unsigned int i;
        struct parsed_dn *dns, *old_dns;
@@ -1571,13 +1665,13 @@ static int replmd_modify_la_add(struct ldb_module *module,
 
        unix_to_nt_time(&now, t);
 
-       ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
+       ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
        if (ret != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
                return ret;
        }
 
-       ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
+       ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
        if (ret != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
                return ret;
@@ -1588,7 +1682,7 @@ static int replmd_modify_la_add(struct ldb_module *module,
                talloc_free(tmp_ctx);
                return LDB_ERR_OPERATIONS_ERROR;
        }
-       
+
        ret = replmd_check_upgrade_links(old_dns, old_num_values, old_el, invocation_id);
        if (ret != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
@@ -1675,7 +1769,8 @@ static int replmd_modify_la_delete(struct ldb_module *module,
                                   const struct dsdb_attribute *schema_attr,
                                   uint64_t seq_num,
                                   time_t t,
-                                  struct GUID *msg_guid)
+                                  struct GUID *msg_guid,
+                                  struct ldb_request *parent)
 {
        unsigned int i;
        struct parsed_dn *dns, *old_dns;
@@ -1697,13 +1792,13 @@ static int replmd_modify_la_delete(struct ldb_module *module,
                return LDB_ERR_NO_SUCH_ATTRIBUTE;
        }
 
-       ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
+       ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
        if (ret != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
                return ret;
        }
 
-       ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
+       ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
        if (ret != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
                return ret;
@@ -1794,7 +1889,8 @@ static int replmd_modify_la_replace(struct ldb_module *module,
                                    const struct dsdb_attribute *schema_attr,
                                    uint64_t seq_num,
                                    time_t t,
-                                   struct GUID *msg_guid)
+                                   struct GUID *msg_guid,
+                                   struct ldb_request *parent)
 {
        unsigned int i;
        struct parsed_dn *dns, *old_dns;
@@ -1815,13 +1911,13 @@ static int replmd_modify_la_replace(struct ldb_module *module,
                return LDB_SUCCESS;
        }
 
-       ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid);
+       ret = get_parsed_dns(module, tmp_ctx, el, &dns, schema_attr->syntax->ldap_oid, parent);
        if (ret != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
                return ret;
        }
 
-       ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid);
+       ret = get_parsed_dns(module, tmp_ctx, old_el, &old_dns, schema_attr->syntax->ldap_oid, parent);
        if (ret != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
                return ret;
@@ -1941,7 +2037,8 @@ static int replmd_modify_la_replace(struct ldb_module *module,
  */
 static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
                                               struct ldb_message *msg,
-                                              uint64_t seq_num, time_t t)
+                                              uint64_t seq_num, time_t t,
+                                              struct ldb_request *parent)
 {
        struct ldb_result *res;
        unsigned int i;
@@ -1959,19 +2056,17 @@ static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
                return LDB_SUCCESS;
        }
 
-#if !W2K3_LINKED_ATTRIBUTES
-       return LDB_SUCCESS;
-#endif
-
        if (dsdb_functional_level(ldb) == DS_DOMAIN_FUNCTION_2000) {
                /* don't do anything special for linked attributes */
                return LDB_SUCCESS;
        }
 
        ret = dsdb_module_search_dn(module, msg, &res, msg->dn, NULL,
-                                   DSDB_SEARCH_SHOW_DELETED |
+                                   DSDB_FLAG_NEXT_MODULE |
+                                   DSDB_SEARCH_SHOW_RECYCLED |
                                    DSDB_SEARCH_REVEAL_INTERNALS |
-                                   DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
+                                   DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT,
+                                   parent);
        if (ret != LDB_SUCCESS) {
                return ret;
        }
@@ -1991,7 +2086,8 @@ static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
                        = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
                if (!schema_attr) {
                        ldb_asprintf_errstring(ldb,
-                                              "attribute %s is not a valid attribute in schema", el->name);
+                                              "%s: attribute %s is not a valid attribute in schema",
+                                              __FUNCTION__, el->name);
                        return LDB_ERR_OBJECT_CLASS_VIOLATION;
                }
                if (schema_attr->linkID == 0) {
@@ -2006,13 +2102,13 @@ static int replmd_modify_handle_linked_attribs(struct ldb_module *module,
                old_el = ldb_msg_find_element(old_msg, el->name);
                switch (el->flags & LDB_FLAG_MOD_MASK) {
                case LDB_FLAG_MOD_REPLACE:
-                       ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
+                       ret = replmd_modify_la_replace(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
                        break;
                case LDB_FLAG_MOD_DELETE:
-                       ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
+                       ret = replmd_modify_la_delete(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
                        break;
                case LDB_FLAG_MOD_ADD:
-                       ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid);
+                       ret = replmd_modify_la_add(module, schema, msg, el, old_el, schema_attr, seq_num, t, &old_guid, parent);
                        break;
                default:
                        ldb_asprintf_errstring(ldb,
@@ -2057,6 +2153,8 @@ static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
        bool is_urgent = false;
        struct loadparm_context *lp_ctx;
        char *referral;
+       unsigned int functional_level;
+       const DATA_BLOB *guid_blob;
 
        /* do not manipulate our control entries */
        if (ldb_dn_is_special(req->op.mod.message->dn)) {
@@ -2064,16 +2162,26 @@ static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
        }
 
        ldb = ldb_module_get_ctx(module);
-       lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
-                                struct loadparm_context);
 
        ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
 
+       guid_blob = ldb_msg_find_ldb_val(req->op.mod.message, "objectGUID");
+       if ( guid_blob != NULL ) {
+               ldb_set_errstring(ldb,
+                                 "replmd_modify: it's not allowed to change the objectGUID!");
+               return LDB_ERR_CONSTRAINT_VIOLATION;
+       }
+
        ac = replmd_ctx_init(module, req);
-       if (!ac) {
-               return LDB_ERR_OPERATIONS_ERROR;
+       if (ac == NULL) {
+               return ldb_module_oom(module);
        }
 
+       functional_level = dsdb_functional_level(ldb);
+
+       lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"),
+                                struct loadparm_context);
+
        /* we have to copy the message as the caller might have it as a const */
        msg = ldb_msg_copy_shallow(ac, req->op.mod.message);
        if (msg == NULL) {
@@ -2087,13 +2195,12 @@ static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
 
        ret = replmd_update_rpmd(module, ac->schema, req, msg, &ac->seq_num, t, &is_urgent);
        if (ret == LDB_ERR_REFERRAL) {
-               talloc_free(ac);
-
                referral = talloc_asprintf(req,
                                           "ldap://%s/%s",
-                                          lp_dnsdomain(lp_ctx),
+                                          lpcfg_dnsdomain(lp_ctx),
                                           ldb_dn_get_linearized(msg->dn));
                ret = ldb_module_send_referral(req, referral);
+               talloc_free(ac);
                return ldb_module_done(req, NULL, NULL, ret);
        }
 
@@ -2102,7 +2209,7 @@ static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
                return ret;
        }
 
-       ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t);
+       ret = replmd_modify_handle_linked_attribs(module, msg, ac->seq_num, t, req);
        if (ret != LDB_SUCCESS) {
                talloc_free(ac);
                return ret;
@@ -2119,21 +2226,36 @@ static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
                                req->controls,
                                ac, replmd_op_callback,
                                req);
+       LDB_REQ_SET_LOCATION(down_req);
        if (ret != LDB_SUCCESS) {
                talloc_free(ac);
                return ret;
        }
+
+       /* If we are in functional level 2000, then
+        * replmd_modify_handle_linked_attribs will have done
+        * nothing */
+       if (functional_level == DS_DOMAIN_FUNCTION_2000) {
+               ret = ldb_request_add_control(down_req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
+               if (ret != LDB_SUCCESS) {
+                       talloc_free(ac);
+                       return ret;
+               }
+       }
+
        talloc_steal(down_req, msg);
 
        /* we only change whenChanged and uSNChanged if the seq_num
           has changed */
        if (ac->seq_num != 0) {
-               if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
+               ret = add_time_element(msg, "whenChanged", t);
+               if (ret != LDB_SUCCESS) {
                        talloc_free(ac);
                        return ret;
                }
 
-               if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
+               ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
+               if (ret != LDB_SUCCESS) {
                        talloc_free(ac);
                        return ret;
                }
@@ -2168,16 +2290,17 @@ static int replmd_rename(struct ldb_module *module, struct ldb_request *req)
        ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_rename\n");
 
        ac = replmd_ctx_init(module, req);
-       if (!ac) {
-               return LDB_ERR_OPERATIONS_ERROR;
+       if (ac == NULL) {
+               return ldb_module_oom(module);
        }
+
        ret = ldb_build_rename_req(&down_req, ldb, ac,
                                   ac->req->op.rename.olddn,
                                   ac->req->op.rename.newdn,
                                   ac->req->controls,
                                   ac, replmd_rename_callback,
                                   ac->req);
-
+       LDB_REQ_SET_LOCATION(down_req);
        if (ret != LDB_SUCCESS) {
                talloc_free(ac);
                return ret;
@@ -2236,19 +2359,21 @@ static int replmd_rename_callback(struct ldb_request *req, struct ldb_reply *are
                                req->controls,
                                ac, replmd_op_callback,
                                req);
-
+       LDB_REQ_SET_LOCATION(down_req);
        if (ret != LDB_SUCCESS) {
                talloc_free(ac);
                return ret;
        }
        talloc_steal(down_req, msg);
 
-       if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
+       ret = add_time_element(msg, "whenChanged", t);
+       if (ret != LDB_SUCCESS) {
                talloc_free(ac);
                return ret;
        }
-       
-       if (add_uint64_element(msg, "uSNChanged", ac->seq_num) != LDB_SUCCESS) {
+
+       ret = add_uint64_element(ldb, msg, "uSNChanged", ac->seq_num);
+       if (ret != LDB_SUCCESS) {
                talloc_free(ac);
                return ret;
        }
@@ -2265,7 +2390,8 @@ static int replmd_delete_remove_link(struct ldb_module *module,
                                     const struct dsdb_schema *schema,
                                     struct ldb_dn *dn,
                                     struct ldb_message_element *el,
-                                    const struct dsdb_attribute *sa)
+                                    const struct dsdb_attribute *sa,
+                                    struct ldb_request *parent)
 {
        unsigned int i;
        TALLOC_CTX *tmp_ctx = talloc_new(module);
@@ -2323,7 +2449,7 @@ static int replmd_delete_remove_link(struct ldb_module *module,
                el2->values = &dn_val;
                el2->num_values = 1;
 
-               ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
+               ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE, parent);
                if (ret != LDB_SUCCESS) {
                        talloc_free(tmp_ctx);
                        return ret;
@@ -2343,7 +2469,7 @@ static int replmd_delete_remove_link(struct ldb_module *module,
 static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
 {
        int ret = LDB_ERR_OTHER;
-       bool retb;
+       bool retb, disallow_move_on_delete;
        struct ldb_dn *old_dn, *new_dn;
        const char *rdn_name;
        const struct ldb_val *rdn_value, *new_rdn_value;
@@ -2380,7 +2506,7 @@ static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
                ldb_oom(ldb);
                return LDB_ERR_OPERATIONS_ERROR;
        }
-       
+
        schema = dsdb_get_schema(ldb, tmp_ctx);
        if (!schema) {
                return LDB_ERR_OPERATIONS_ERROR;
@@ -2391,9 +2517,10 @@ static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
        /* we need the complete msg off disk, so we can work out which
           attributes need to be removed */
        ret = dsdb_module_search_dn(module, tmp_ctx, &res, old_dn, NULL,
-                                   DSDB_SEARCH_SHOW_DELETED |
+                                   DSDB_FLAG_NEXT_MODULE |
+                                   DSDB_SEARCH_SHOW_RECYCLED |
                                    DSDB_SEARCH_REVEAL_INTERNALS |
-                                   DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT);
+                                   DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT, req);
        if (ret != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
                return ret;
@@ -2443,6 +2570,10 @@ static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
 
        rdn_name = ldb_dn_get_rdn_name(old_dn);
        rdn_value = ldb_dn_get_rdn_val(old_dn);
+       if ((rdn_name == NULL) || (rdn_value == NULL)) {
+               talloc_free(tmp_ctx);
+               return ldb_operr(ldb);
+       }
 
        msg = ldb_msg_new(tmp_ctx);
        if (msg == NULL) {
@@ -2454,16 +2585,31 @@ static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
        msg->dn = old_dn;
 
        if (deletion_state == OBJECT_NOT_DELETED){
+               /* consider the SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE flag */
+               disallow_move_on_delete =
+                       (ldb_msg_find_attr_as_int(old_msg, "systemFlags", 0)
+                               & SYSTEM_FLAG_DISALLOW_MOVE_ON_DELETE);
+
                /* work out where we will be renaming this object to */
-               ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn, &new_dn);
-               if (ret != LDB_SUCCESS) {
-                       /* this is probably an attempted delete on a partition
-                        * that doesn't allow delete operations, such as the
-                        * schema partition */
-                       ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
-                                                  ldb_dn_get_linearized(old_dn));
-                       talloc_free(tmp_ctx);
-                       return LDB_ERR_UNWILLING_TO_PERFORM;
+               if (!disallow_move_on_delete) {
+                       ret = dsdb_get_deleted_objects_dn(ldb, tmp_ctx, old_dn,
+                                                         &new_dn);
+                       if (ret != LDB_SUCCESS) {
+                               /* this is probably an attempted delete on a partition
+                                * that doesn't allow delete operations, such as the
+                                * schema partition */
+                               ldb_asprintf_errstring(ldb, "No Deleted Objects container for DN %s",
+                                                          ldb_dn_get_linearized(old_dn));
+                               talloc_free(tmp_ctx);
+                               return LDB_ERR_UNWILLING_TO_PERFORM;
+                       }
+               } else {
+                       new_dn = ldb_dn_get_parent(tmp_ctx, old_dn);
+                       if (new_dn == NULL) {
+                               ldb_module_oom(module);
+                               talloc_free(tmp_ctx);
+                               return LDB_ERR_OPERATIONS_ERROR;
+                       }
                }
 
                /* get the objects GUID from the search we just did */
@@ -2472,7 +2618,7 @@ static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
                /* Add a formatted child */
                retb = ldb_dn_add_child_fmt(new_dn, "%s=%s\\0ADEL:%s",
                                                rdn_name,
-                                               rdn_value->data,
+                                               ldb_dn_escape_value(tmp_ctx, *rdn_value),
                                                GUID_string(tmp_ctx, &guid));
                if (!retb) {
                        DEBUG(0,(__location__ ": Unable to add a formatted child to dn: %s",
@@ -2488,7 +2634,7 @@ static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
                        talloc_free(tmp_ctx);
                        return ret;
                }
-               msg->elements[el_count++].flags = LDB_FLAG_MOD_ADD;
+               msg->elements[el_count++].flags = LDB_FLAG_MOD_REPLACE;
        }
 
        /*
@@ -2511,9 +2657,10 @@ static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
        /* we need the storage form of the parent GUID */
        ret = dsdb_module_search_dn(module, tmp_ctx, &parent_res,
                                    ldb_dn_get_parent(tmp_ctx, old_dn), NULL,
+                                   DSDB_FLAG_NEXT_MODULE |
                                    DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
                                    DSDB_SEARCH_REVEAL_INTERNALS|
-                                   DSDB_SEARCH_SHOW_DELETED);
+                                   DSDB_SEARCH_SHOW_RECYCLED, req);
        if (ret != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
                return ret;
@@ -2590,7 +2737,7 @@ static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
                                continue;
                        }
                        if (sa->linkID && sa->linkID & 1) {
-                       ret = replmd_delete_remove_link(module, schema, old_dn, el, sa);
+                               ret = replmd_delete_remove_link(module, schema, old_dn, el, sa, req);
                                if (ret != LDB_SUCCESS) {
                                        talloc_free(tmp_ctx);
                                        return LDB_ERR_OPERATIONS_ERROR;
@@ -2614,11 +2761,24 @@ static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
        }
 
        if (deletion_state == OBJECT_NOT_DELETED) {
+               const struct dsdb_attribute *sa;
+
                /* work out what the new rdn value is, for updating the
                   rDN and name fields */
                new_rdn_value = ldb_dn_get_rdn_val(new_dn);
+               if (new_rdn_value == NULL) {
+                       talloc_free(tmp_ctx);
+                       return ldb_operr(ldb);
+               }
+
+               sa = dsdb_attribute_by_lDAPDisplayName(schema, rdn_name);
+               if (!sa) {
+                       talloc_free(tmp_ctx);
+                       return LDB_ERR_OPERATIONS_ERROR;
+               }
 
-               ret = ldb_msg_add_value(msg, strlower_talloc(tmp_ctx, rdn_name), new_rdn_value, &el);
+               ret = ldb_msg_add_value(msg, sa->lDAPDisplayName, new_rdn_value,
+                                       &el);
                if (ret != LDB_SUCCESS) {
                        talloc_free(tmp_ctx);
                        return ret;
@@ -2636,7 +2796,7 @@ static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
                }
        }
 
-       ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE);
+       ret = dsdb_module_modify(module, msg, DSDB_FLAG_OWN_MODULE, req);
        if (ret != LDB_SUCCESS) {
                ldb_asprintf_errstring(ldb, "replmd_delete: Failed to modify object %s in delete - %s",
                                       ldb_dn_get_linearized(old_dn), ldb_errstring(ldb));
@@ -2646,7 +2806,7 @@ static int replmd_delete(struct ldb_module *module, struct ldb_request *req)
 
        if (deletion_state == OBJECT_NOT_DELETED) {
                /* now rename onto the new DN */
-               ret = dsdb_module_rename(module, old_dn, new_dn, 0);
+               ret = dsdb_module_rename(module, old_dn, new_dn, DSDB_FLAG_NEXT_MODULE, req);
                if (ret != LDB_SUCCESS){
                        DEBUG(0,(__location__ ": Failed to rename object from '%s' to '%s' - %s\n",
                                 ldb_dn_get_linearized(old_dn),
@@ -2738,7 +2898,7 @@ static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
                        continue;
                }
        }
-       
+
        /*
         * the meta data array is already sorted by the caller
         */
@@ -2772,6 +2932,7 @@ static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
                                ar,
                                replmd_op_callback,
                                ar->req);
+       LDB_REQ_SET_LOCATION(change_req);
        if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
 
        return ldb_next_request(ar->module, change_req);
@@ -2785,19 +2946,23 @@ static bool replmd_update_is_newer(const struct GUID *current_invocation_id,
                                   const struct GUID *update_invocation_id,
                                   uint32_t current_version,
                                   uint32_t update_version,
+                                  uint32_t current_usn,
+                                  uint32_t update_usn,
                                   NTTIME current_change_time,
                                   NTTIME update_change_time)
 {
-       if (update_version != current_version) {
-               return update_version > current_version;
+       if (GUID_compare(update_invocation_id, current_invocation_id) == 0) {
+               if (update_usn != current_usn) {
+                       return update_usn >= current_usn;
+               }
        }
-       if (update_change_time > current_change_time) {
-               return true;
+       if (update_version != current_version) {
+               return update_version >= current_version;
        }
-       if (update_change_time == current_change_time) {
-               return GUID_compare(update_invocation_id, current_invocation_id) > 0;
+       if (update_change_time != current_change_time) {
+               return update_change_time >= current_change_time;
        }
-       return false;
+       return GUID_compare(update_invocation_id, current_invocation_id) >= 0;
 }
 
 static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *cur_m,
@@ -2807,10 +2972,74 @@ static bool replmd_replPropertyMetaData1_is_newer(struct replPropertyMetaData1 *
                                      &new_m->originating_invocation_id,
                                      cur_m->version,
                                      new_m->version,
+                                     cur_m->originating_usn,
+                                     new_m->originating_usn,
                                      cur_m->originating_change_time,
                                      new_m->originating_change_time);
 }
 
+static struct replPropertyMetaData1 *
+replmd_replPropertyMetaData1_find_attid(struct replPropertyMetaDataBlob *md_blob,
+                                        enum drsuapi_DsAttributeId attid)
+{
+       uint32_t i;
+       struct replPropertyMetaDataCtr1 *rpmd_ctr = &md_blob->ctr.ctr1;
+
+       for (i = 0; i < rpmd_ctr->count; i++) {
+               if (rpmd_ctr->array[i].attid == attid) {
+                       return &rpmd_ctr->array[i];
+               }
+       }
+       return NULL;
+}
+
+
+/*
+  handle renames that come in over DRS replication
+ */
+static int replmd_replicated_handle_rename(struct replmd_replicated_request *ar,
+                                          struct ldb_message *msg,
+                                          struct replPropertyMetaDataBlob *rmd,
+                                          struct replPropertyMetaDataBlob *omd,
+                                          struct ldb_request *parent)
+{
+       struct replPropertyMetaData1 *md_remote;
+       struct replPropertyMetaData1 *md_local;
+
+       if (ldb_dn_compare(msg->dn, ar->search_msg->dn) == 0) {
+               /* no rename */
+               return LDB_SUCCESS;
+       }
+
+       /* now we need to check for double renames. We could have a
+        * local rename pending which our replication partner hasn't
+        * received yet. We choose which one wins by looking at the
+        * attribute stamps on the two objects, the newer one wins
+        */
+       md_remote = replmd_replPropertyMetaData1_find_attid(rmd, DRSUAPI_ATTID_name);
+       md_local  = replmd_replPropertyMetaData1_find_attid(omd, DRSUAPI_ATTID_name);
+       /* if there is no name attribute then we have to assume the
+          object we've received is in fact newer */
+       if (!md_remote || !md_local ||
+           replmd_replPropertyMetaData1_is_newer(md_local, md_remote)) {
+               DEBUG(4,("replmd_replicated_request rename %s => %s\n",
+                        ldb_dn_get_linearized(ar->search_msg->dn),
+                        ldb_dn_get_linearized(msg->dn)));
+               /* pass rename to the next module
+                * so it doesn't appear as an originating update */
+               return dsdb_module_rename(ar->module,
+                                         ar->search_msg->dn, msg->dn,
+                                         DSDB_FLAG_NEXT_MODULE | DSDB_MODIFY_RELAX, parent);
+       }
+
+       /* we're going to keep our old object */
+       DEBUG(4,(__location__ ": Keeping object %s and rejecting older rename to %s\n",
+                ldb_dn_get_linearized(ar->search_msg->dn),
+                ldb_dn_get_linearized(msg->dn)));
+       return LDB_SUCCESS;
+}
+
+
 static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
 {
        struct ldb_context *ldb;
@@ -2833,24 +3062,6 @@ static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
        ZERO_STRUCT(omd);
        omd.version = 1;
 
-       /*
-        * TODO: check repl data is correct after a rename
-        */
-       if (ldb_dn_compare(msg->dn, ar->search_msg->dn) != 0) {
-               ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_replicated_request rename %s => %s\n",
-                         ldb_dn_get_linearized(ar->search_msg->dn),
-                         ldb_dn_get_linearized(msg->dn));
-               if (dsdb_module_rename(ar->module,
-                                      ar->search_msg->dn, msg->dn,
-                                      DSDB_FLAG_OWN_MODULE) != LDB_SUCCESS) {
-                       ldb_debug(ldb, LDB_DEBUG_FATAL, "replmd_replicated_request rename %s => %s failed - %s\n",
-                                 ldb_dn_get_linearized(ar->search_msg->dn),
-                                 ldb_dn_get_linearized(msg->dn),
-                                 ldb_errstring(ldb));
-                       return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
-               }
-       }
-
        /* find existing meta data */
        omd_value = ldb_msg_find_ldb_val(ar->search_msg, "replPropertyMetaData");
        if (omd_value) {
@@ -2866,6 +3077,17 @@ static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
                }
        }
 
+       /* handle renames that come in over DRS */
+       ret = replmd_replicated_handle_rename(ar, msg, rmd, &omd, ar->req);
+       if (ret != LDB_SUCCESS) {
+               ldb_debug(ldb, LDB_DEBUG_FATAL,
+                         "replmd_replicated_request rename %s => %s failed - %s\n",
+                         ldb_dn_get_linearized(ar->search_msg->dn),
+                         ldb_dn_get_linearized(msg->dn),
+                         ldb_errstring(ldb));
+               return replmd_replicated_request_werror(ar, WERR_DS_DRA_DB_ERROR);
+       }
+
        ZERO_STRUCT(nmd);
        nmd.version = 1;
        nmd.ctr.ctr1.count = omd.ctr.ctr1.count + rmd->ctr.ctr1.count;
@@ -2900,7 +3122,7 @@ static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
                                break;
                        }
 
-                       if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTRIBUTE_instanceType) {
+                       if (rmd->ctr.ctr1.array[i].attid != DRSUAPI_ATTID_instanceType) {
                                DEBUG(3,("Discarding older DRS attribute update to %s on %s from %s\n",
                                         msg->elements[i-removed_attrs].name,
                                         ldb_dn_get_linearized(msg->dn),
@@ -3007,6 +3229,7 @@ static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
                                ar,
                                replmd_op_callback,
                                ar->req);
+       LDB_REQ_SET_LOCATION(change_req);
        if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
 
        return ldb_next_request(ar->module, change_req);
@@ -3090,8 +3313,10 @@ static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
                                   ar,
                                   replmd_replicated_apply_search_callback,
                                   ar->req);
+       LDB_REQ_SET_LOCATION(search_req);
 
-       ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_DELETED_OID, true, NULL);
+       ret = ldb_request_add_control(search_req, LDB_CONTROL_SHOW_RECYCLED_OID,
+                                     true, NULL);
        if (ret != LDB_SUCCESS) {
                return ret;
        }
@@ -3112,8 +3337,6 @@ static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
                return ret;
        }
 
-       if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
-
        return ldb_next_request(ar->module, search_req);
 }
 
@@ -3168,6 +3391,7 @@ static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *a
        time_t t = time(NULL);
        NTTIME now;
        int ret;
+       uint32_t instanceType;
 
        ldb = ldb_module_get_ctx(ar->module);
        ruv = ar->objs->uptodateness_vector;
@@ -3178,6 +3402,13 @@ static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *a
 
        unix_to_nt_time(&now, t);
 
+       instanceType = ldb_msg_find_attr_as_uint(ar->search_msg, "instanceType", 0);
+       if (! (instanceType & INSTANCE_TYPE_IS_NC_HEAD)) {
+               DEBUG(4,(__location__ ": Skipping UDV and repsFrom update as not NC root: %s\n",
+                        ldb_dn_get_linearized(ar->search_msg->dn)));
+               return ldb_module_done(ar->req, NULL, NULL, LDB_SUCCESS);
+       }
+
        /*
         * first create the new replUpToDateVector
         */
@@ -3242,7 +3473,7 @@ static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *a
                        if (ruv->cursors[i].highest_usn > nuv.ctr.ctr2.cursors[j].highest_usn) {
                                nuv.ctr.ctr2.cursors[j].highest_usn = ruv->cursors[i].highest_usn;
                        }
-                       break;                  
+                       break;
                }
 
                if (found) continue;
@@ -3324,11 +3555,6 @@ static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *a
        ZERO_STRUCT(nrf);
        nrf.version                                     = 1;
        nrf.ctr.ctr1                                    = *ar->objs->source_dsa;
-       /* and fix some values... */
-       nrf.ctr.ctr1.consecutive_sync_failures          = 0;
-       nrf.ctr.ctr1.last_success                       = now;
-       nrf.ctr.ctr1.last_attempt                       = now;
-       nrf.ctr.ctr1.result_last_attempt                = WERR_OK;
        nrf.ctr.ctr1.highwatermark.highest_usn          = nrf.ctr.ctr1.highwatermark.tmp_highest_usn;
 
        /*
@@ -3357,7 +3583,7 @@ static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *a
                        /*
                         * we compare the source dsa objectGUID not the invocation_id
                         * because we want only one repsFrom value per source dsa
-                        * and when the invocation_id of the source dsa has changed we don't need 
+                        * and when the invocation_id of the source dsa has changed we don't need
                         * the old repsFrom with the old invocation_id
                         */
                        if (!GUID_equal(&trf->ctr.ctr1.source_dsa_obj_guid,
@@ -3393,7 +3619,7 @@ static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *a
        }
 
        /* we now fill the value which is already attached to ldb_message */
-       ndr_err = ndr_push_struct_blob(nrf_value, msg, 
+       ndr_err = ndr_push_struct_blob(nrf_value, msg,
                                       &nrf,
                                       (ndr_push_flags_fn_t)ndr_push_repsFromToBlob);
        if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
@@ -3401,7 +3627,7 @@ static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *a
                return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
        }
 
-       /* 
+       /*
         * the ldb_message_element for the attribute, has all the old values and the new one
         * so we'll replace the whole attribute with all values
         */
@@ -3422,6 +3648,7 @@ static int replmd_replicated_uptodate_modify(struct replmd_replicated_request *a
                                ar,
                                replmd_replicated_uptodate_modify_callback,
                                ar->req);
+       LDB_REQ_SET_LOCATION(change_req);
        if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
 
        return ldb_next_request(ar->module, change_req);
@@ -3476,6 +3703,7 @@ static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *a
        static const char *attrs[] = {
                "replUpToDateVector",
                "repsFrom",
+               "instanceType",
                NULL
        };
        struct ldb_request *search_req;
@@ -3494,6 +3722,7 @@ static int replmd_replicated_uptodate_vector(struct replmd_replicated_request *a
                                   ar,
                                   replmd_replicated_uptodate_search_callback,
                                   ar->req);
+       LDB_REQ_SET_LOCATION(search_req);
        if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
 
        return ldb_next_request(ar->module, search_req);
@@ -3509,7 +3738,7 @@ static int replmd_extended_replicated_objects(struct ldb_module *module, struct
        struct ldb_control **ctrls;
        int ret;
        uint32_t i;
-       struct replmd_private *replmd_private = 
+       struct replmd_private *replmd_private =
                talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 
        ldb = ldb_module_get_ctx(module);
@@ -3551,11 +3780,20 @@ static int replmd_extended_replicated_objects(struct ldb_module *module, struct
                if (!req->controls) return replmd_replicated_request_werror(ar, WERR_NOMEM);
        }
 
+       /* This allows layers further down to know if a change came in over replication */
        ret = ldb_request_add_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID, false, NULL);
        if (ret != LDB_SUCCESS) {
                return ret;
        }
 
+       /* If this change contained linked attributes in the body
+        * (rather than in the links section) we need to update
+        * backlinks in linked_attributes */
+       ret = ldb_request_add_control(req, DSDB_CONTROL_APPLY_LINKS, false, NULL);
+       if (ret != LDB_SUCCESS) {
+               return ret;
+       }
+
        ar->controls = req->controls;
        req->controls = ctrls;
 
@@ -3597,8 +3835,9 @@ static int replmd_extended_replicated_objects(struct ldb_module *module, struct
   process one linked attribute structure
  */
 static int replmd_process_linked_attribute(struct ldb_module *module,
-                                          struct la_entry *la_entry)
-{                                         
+                                          struct la_entry *la_entry,
+                                          struct ldb_request *parent)
+{
        struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
        struct ldb_context *ldb = ldb_module_get_ctx(module);
        struct ldb_message *msg;
@@ -3620,40 +3859,40 @@ static int replmd_process_linked_attribute(struct ldb_module *module,
        const struct GUID *our_invocation_id;
 
 /*
-linked_attributes[0]:                                                     
-     &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute 
-        identifier               : *                                      
-            identifier: struct drsuapi_DsReplicaObjectIdentifier          
-                __ndr_size               : 0x0000003a (58)                
-                __ndr_size_sid           : 0x00000000 (0)                 
+linked_attributes[0]:
+     &objs->linked_attributes[i]: struct drsuapi_DsReplicaLinkedAttribute
+        identifier               : *
+            identifier: struct drsuapi_DsReplicaObjectIdentifier
+                __ndr_size               : 0x0000003a (58)
+                __ndr_size_sid           : 0x00000000 (0)
                 guid                     : 8e95b6a9-13dd-4158-89db-3220a5be5cc7
-                sid                      : S-0-0                               
-                __ndr_size_dn            : 0x00000000 (0)                      
-                dn                       : ''                                  
-        attid                    : DRSUAPI_ATTRIBUTE_member (0x1F)             
-        value: struct drsuapi_DsAttributeValue                                 
-            __ndr_size               : 0x0000007e (126)                        
-            blob                     : *                                       
-                blob                     : DATA_BLOB length=126                
-        flags                    : 0x00000001 (1)                              
-               1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE                      
-        originating_add_time     : Wed Sep  2 22:20:01 2009 EST                
-        meta_data: struct drsuapi_DsReplicaMetaData                            
-            version                  : 0x00000015 (21)                         
-            originating_change_time  : Wed Sep  2 23:39:07 2009 EST            
-            originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64    
-            originating_usn          : 0x000000000001e19c (123292)             
+                sid                      : S-0-0
+                __ndr_size_dn            : 0x00000000 (0)
+                dn                       : ''
+        attid                    : DRSUAPI_ATTID_member (0x1F)
+        value: struct drsuapi_DsAttributeValue
+            __ndr_size               : 0x0000007e (126)
+            blob                     : *
+                blob                     : DATA_BLOB length=126
+        flags                    : 0x00000001 (1)
+               1: DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE
+        originating_add_time     : Wed Sep  2 22:20:01 2009 EST
+        meta_data: struct drsuapi_DsReplicaMetaData
+            version                  : 0x00000015 (21)
+            originating_change_time  : Wed Sep  2 23:39:07 2009 EST
+            originating_invocation_id: 794640f3-18cf-40ee-a211-a93992b67a64
+            originating_usn          : 0x000000000001e19c (123292)
 
 (for cases where the link is to a normal DN)
-     &target: struct drsuapi_DsReplicaObjectIdentifier3                        
-        __ndr_size               : 0x0000007e (126)                            
-        __ndr_size_sid           : 0x0000001c (28)                             
-        guid                     : 7639e594-db75-4086-b0d4-67890ae46031        
+     &target: struct drsuapi_DsReplicaObjectIdentifier3
+        __ndr_size               : 0x0000007e (126)
+        __ndr_size_sid           : 0x0000001c (28)
+        guid                     : 7639e594-db75-4086-b0d4-67890ae46031
         sid                      : S-1-5-21-2848215498-2472035911-1947525656-19924
-        __ndr_size_dn            : 0x00000022 (34)                                
-        dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'           
+        __ndr_size_dn            : 0x00000022 (34)
+        dn                       : 'CN=UOne,OU=TestOU,DC=vsofs8,DC=com'
  */
-       
+
        /* find the attribute being modified */
        attr = dsdb_attribute_by_attributeID_id(schema, la->attid);
        if (attr == NULL) {
@@ -3669,10 +3908,12 @@ linked_attributes[0]:
           this GUID, returning attribute being modified. We will then
           use this msg as the basis for a modify call */
        ret = dsdb_module_search(module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, attrs,
+                                DSDB_FLAG_NEXT_MODULE |
                                 DSDB_SEARCH_SEARCH_ALL_PARTITIONS |
-                                DSDB_SEARCH_SHOW_DELETED |
+                                DSDB_SEARCH_SHOW_RECYCLED |
                                 DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
                                 DSDB_SEARCH_REVEAL_INTERNALS,
+                                parent,
                                 "objectGUID=%s", GUID_string(tmp_ctx, &la->identifier->guid));
        if (ret != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
@@ -3699,7 +3940,7 @@ linked_attributes[0]:
        }
 
        /* parse the existing links */
-       ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid);
+       ret = get_parsed_dns(module, tmp_ctx, old_el, &pdn_list, attr->syntax->ldap_oid, parent);
        if (ret != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
                return ret;
@@ -3737,7 +3978,7 @@ linked_attributes[0]:
 
        /* re-resolve the DN by GUID, as the DRS server may give us an
           old DN value */
-       ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn);
+       ret = dsdb_module_dn_by_guid(module, dsdb_dn, &guid, &dsdb_dn->dn, parent);
        if (ret != LDB_SUCCESS) {
                DEBUG(2,(__location__ ": WARNING: Failed to re-resolve GUID %s - using %s",
                         GUID_string(tmp_ctx, &guid),
@@ -3750,17 +3991,21 @@ linked_attributes[0]:
                /* see if this update is newer than what we have already */
                struct GUID invocation_id = GUID_zero();
                uint32_t version = 0;
+               uint32_t originating_usn = 0;
                NTTIME change_time = 0;
                uint32_t rmd_flags = dsdb_dn_rmd_flags(pdn->dsdb_dn->dn);
 
                dsdb_get_extended_dn_guid(pdn->dsdb_dn->dn, &invocation_id, "RMD_INVOCID");
                dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &version, "RMD_VERSION");
+               dsdb_get_extended_dn_uint32(pdn->dsdb_dn->dn, &originating_usn, "RMD_ORIGINATING_USN");
                dsdb_get_extended_dn_nttime(pdn->dsdb_dn->dn, &change_time, "RMD_CHANGETIME");
 
                if (!replmd_update_is_newer(&invocation_id,
                                            &la->meta_data.originating_invocation_id,
                                            version,
                                            la->meta_data.version,
+                                           originating_usn,
+                                           la->meta_data.originating_usn,
                                            change_time,
                                            la->meta_data.originating_change_time)) {
                        DEBUG(3,("Discarding older DRS linked attribute update to %s on %s from %s\n",
@@ -3846,12 +4091,19 @@ linked_attributes[0]:
           has changed */
        if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
-               return LDB_ERR_OPERATIONS_ERROR;
+               return ldb_operr(ldb);
        }
 
-       if (add_uint64_element(msg, "uSNChanged", seq_num) != LDB_SUCCESS) {
+       if (add_uint64_element(ldb, msg, "uSNChanged",
+                              seq_num) != LDB_SUCCESS) {
                talloc_free(tmp_ctx);
-               return LDB_ERR_OPERATIONS_ERROR;
+               return ldb_operr(ldb);
+       }
+
+       old_el = ldb_msg_find_element(msg, attr->lDAPDisplayName);
+       if (old_el == NULL) {
+               talloc_free(tmp_ctx);
+               return ldb_operr(ldb);
        }
 
        ret = dsdb_check_single_valued_link(attr, old_el);
@@ -3860,7 +4112,9 @@ linked_attributes[0]:
                return ret;
        }
 
-       ret = dsdb_module_modify(module, msg, DSDB_MODIFY_RELAX);
+       old_el->flags |= LDB_FLAG_INTERNAL_DISABLE_SINGLE_VALUE_CHECK;
+
+       ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE, parent);
        if (ret != LDB_SUCCESS) {
                ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
                          ldb_errstring(ldb),
@@ -3868,10 +4122,10 @@ linked_attributes[0]:
                talloc_free(tmp_ctx);
                return ret;
        }
-       
+
        talloc_free(tmp_ctx);
 
-       return ret;     
+       return ret;
 }
 
 static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
@@ -3885,7 +4139,7 @@ static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
 
 
 /*
-  we hook into the transaction operations to allow us to 
+  we hook into the transaction operations to allow us to
   perform the linked attribute updates at the end of the whole
   transaction. This allows a forward linked attribute to be created
   before the object is created. During a vampire, w2k8 sends us linked
@@ -3911,11 +4165,11 @@ static int replmd_start_transaction(struct ldb_module *module)
 
 /*
   on prepare commit we loop over our queued la_context structures and
-  apply each of them  
+  apply each of them
  */
 static int replmd_prepare_commit(struct ldb_module *module)
 {
-       struct replmd_private *replmd_private = 
+       struct replmd_private *replmd_private =
                talloc_get_type(ldb_module_get_private(module), struct replmd_private);
        struct la_entry *la, *prev;
        struct la_backlink *bl;
@@ -3927,7 +4181,7 @@ static int replmd_prepare_commit(struct ldb_module *module)
        for (la = DLIST_TAIL(replmd_private->la_list); la; la=prev) {
                prev = DLIST_PREV(la);
                DLIST_REMOVE(replmd_private->la_list, la);
-               ret = replmd_process_linked_attribute(module, la);
+               ret = replmd_process_linked_attribute(module, la, NULL);
                if (ret != LDB_SUCCESS) {
                        replmd_txn_cleanup(replmd_private);
                        return ret;
@@ -3937,7 +4191,7 @@ static int replmd_prepare_commit(struct ldb_module *module)
        /* process our backlink list, creating and deleting backlinks
           as necessary */
        for (bl=replmd_private->la_backlinks; bl; bl=bl->next) {
-               ret = replmd_process_backlink(module, bl);
+               ret = replmd_process_backlink(module, bl, NULL);
                if (ret != LDB_SUCCESS) {
                        replmd_txn_cleanup(replmd_private);
                        return ret;
@@ -3947,17 +4201,17 @@ static int replmd_prepare_commit(struct ldb_module *module)
        replmd_txn_cleanup(replmd_private);
 
        /* possibly change @REPLCHANGED */
-       ret = replmd_notify_store(module);
+       ret = replmd_notify_store(module, NULL);
        if (ret != LDB_SUCCESS) {
                return ret;
        }
-       
+
        return ldb_next_prepare_commit(module);
 }
 
 static int replmd_del_transaction(struct ldb_module *module)
 {
-       struct replmd_private *replmd_private = 
+       struct replmd_private *replmd_private =
                talloc_get_type(ldb_module_get_private(module), struct replmd_private);
        replmd_txn_cleanup(replmd_private);
 
@@ -3965,7 +4219,7 @@ static int replmd_del_transaction(struct ldb_module *module)
 }
 
 
-_PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
+static const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
        .name          = "repl_meta_data",
        .init_context      = replmd_init,
        .add               = replmd_add,
@@ -3977,3 +4231,9 @@ _PUBLIC_ const struct ldb_module_ops ldb_repl_meta_data_module_ops = {
        .prepare_commit    = replmd_prepare_commit,
        .del_transaction   = replmd_del_transaction,
 };
+
+int ldb_repl_meta_data_module_init(const char *version)
+{
+       LDB_MODULE_CHECK_VERSION(version);
+       return ldb_register_module(&ldb_repl_meta_data_module_ops);
+}