replmd: Pass old_el into replmd_process_linked_attribute()

We should only need to lookup the msg attribute once per source object.
The old_el->values may change due to link-processing, but old_el itself
should not.

This is not aimed at improving performance, but we need to change how
old_el is used before we can change pdn_list (which is more costly
processing-wise).

Signed-off-by: Tim Beale <timbeale@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

diff --git a/source4/dsdb/samdb/ldb_modules/repl_meta_data.c b/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
index bcb74f4ebbbac236b1d78281226245ad75ff7fce..280a6550a0151195f118b8bbad0c6a841eecddec 100644 (file)
--- a/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
+++ b/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
@@ -7938,6 +7938,7 @@ static int replmd_process_linked_attribute(struct ldb_module *module,
                                           const struct dsdb_attribute *attr,
                                           struct la_entry *la_entry,
                                           struct ldb_request *parent,
+                                          struct ldb_message_element *old_el,
                                           replmd_link_changed *change)
 {
        struct drsuapi_DsReplicaLinkedAttribute *la = la_entry->la;
@@ -7946,7 +7947,6 @@ static int replmd_process_linked_attribute(struct ldb_module *module,
        int ret;
        struct dsdb_dn *dsdb_dn = NULL;
        uint64_t seq_num = 0;
-       struct ldb_message_element *old_el;
        struct parsed_dn *pdn_list, *pdn, *next;
        struct GUID guid = GUID_zero();
        bool active = (la->flags & DRSUAPI_DS_LINKED_ATTRIBUTE_FLAG_ACTIVE)?true:false;
@@ -7969,17 +7969,6 @@ static int replmd_process_linked_attribute(struct ldb_module *module,
                return LDB_ERR_OPERATIONS_ERROR;
        }
 
-       old_el = ldb_msg_find_element(msg, attr->lDAPDisplayName);
-       if (old_el == NULL) {
-               ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName, LDB_FLAG_MOD_REPLACE, &old_el);
-               if (ret != LDB_SUCCESS) {
-                       ldb_module_oom(module);
-                       return LDB_ERR_OPERATIONS_ERROR;
-               }
-       } else {
-               old_el->flags = LDB_FLAG_MOD_REPLACE;
-       }
-
        /* parse the existing links */
        ret = get_parsed_dns_trusted(module, replmd_private, mem_ctx, old_el, &pdn_list,
                                     attr->syntax->ldap_oid, parent);
@@ -8205,6 +8194,7 @@ static int replmd_process_la_group(struct ldb_module *module,
        enum deletion_state deletion_state = OBJECT_NOT_DELETED;
        struct ldb_context *ldb = ldb_module_get_ctx(module);
        const struct dsdb_attribute *attr = NULL;
+       struct ldb_message_element *old_el = NULL;
        replmd_link_changed change_type;
        uint32_t num_changes = 0;
        time_t t;
@@ -8255,6 +8245,18 @@ static int replmd_process_la_group(struct ldb_module *module,
        ldb_msg_remove_attr(msg, "isDeleted");
        ldb_msg_remove_attr(msg, "isRecycled");
 
+       old_el = ldb_msg_find_element(msg, attr->lDAPDisplayName);
+       if (old_el == NULL) {
+               ret = ldb_msg_add_empty(msg, attr->lDAPDisplayName,
+                                       LDB_FLAG_MOD_REPLACE, &old_el);
+               if (ret != LDB_SUCCESS) {
+                       ldb_module_oom(module);
+                       return LDB_ERR_OPERATIONS_ERROR;
+               }
+       } else {
+               old_el->flags = LDB_FLAG_MOD_REPLACE;
+       }
+
        /* go through and process the link targets for this source object */
        for (la = DLIST_TAIL(la_group->la_entries); la; la=prev) {
                prev = DLIST_PREV(la);
@@ -8262,7 +8264,7 @@ static int replmd_process_la_group(struct ldb_module *module,
                ret = replmd_process_linked_attribute(module, tmp_ctx,
                                                      replmd_private,
                                                      msg, attr, la, NULL,
-                                                     &change_type);
+                                                     old_el, &change_type);
                if (ret != LDB_SUCCESS) {
                        replmd_txn_cleanup(replmd_private);
                        return ret;