From 47011649f7026eb0b564e7b54c7bfe9f762fdeee Mon Sep 17 00:00:00 2001
From: Rein Tollevik <rein@openldap.org>
Date: Tue, 24 Feb 2009 20:11:22 +0000
Subject: [PATCH] ITS#5973 use the modify op to pass csn updates from syncrepl
 to syncprov

---
 servers/slapd/overlays/syncprov.c | 51 +++++++++++++++++++++++++++++++
 servers/slapd/syncrepl.c          | 22 +++----------
 2 files changed, 55 insertions(+), 18 deletions(-)

diff --git a/servers/slapd/overlays/syncprov.c b/servers/slapd/overlays/syncprov.c
index 99055f58d7..7520656cf7 100644
--- a/servers/slapd/overlays/syncprov.c
+++ b/servers/slapd/overlays/syncprov.c
@@ -1658,6 +1658,57 @@ syncprov_op_response( Operation *op, SlapReply *rs )
 		maxcsn.bv_val = cbuf;
 		maxcsn.bv_len = sizeof(cbuf);
 		ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
+
+		if ( op->o_dont_replicate &&
+				op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
+				op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
+			/* Catch contextCSN updates from syncrepl. We have to look at
+			 * all the attribute values, as there may be more than one csn
+			 * that changed, and only one can be passed in the csn queue.
+			 */
+			Modifications *mod = op->orm_modlist;
+			int i, j, sid;
+
+			for ( i=0; i<mod->sml_numvals; i++ ) {
+				sid = slap_parse_csn_sid( &mod->sml_values[i] );
+
+				for ( j=0; j<si->si_numcsns; j++ ) {
+					if ( sid == si->si_sids[j] ) {
+						if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
+							ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
+							csn_changed = 1;
+						}
+						break;
+					}
+				}
+
+				if ( j == si->si_numcsns ) {
+					value_add_one( &si->si_ctxcsn, &mod->sml_values[i] );
+					si->si_numcsns++;
+					si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
+						sizeof(int));
+					si->si_sids[j] = sid;
+					csn_changed = 1;
+				}
+			}
+			ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
+
+			if ( csn_changed ) {
+				ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
+				have_psearches = ( si->si_ops != NULL );
+				ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
+
+				if ( have_psearches ) {
+					for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
+						if ( sm->sm_op->s_op->o_abandon )
+							continue;
+						syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_NEW_COOKIE );
+					}
+				}
+			}
+			return SLAP_CB_CONTINUE;
+		}
+
 		slap_get_commit_csn( op, &maxcsn, &foundit );
 		if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
 			/* syncrepl queues the CSN values in the db where
diff --git a/servers/slapd/syncrepl.c b/servers/slapd/syncrepl.c
index 6622383655..f10c36b600 100644
--- a/servers/slapd/syncrepl.c
+++ b/servers/slapd/syncrepl.c
@@ -2887,12 +2887,11 @@ syncrepl_updateCookie(
 {
 	Backend *be = op->o_bd;
 	Modifications mod;
-	struct berval first = BER_BVNULL;
 #ifdef CHECK_CSN
 	Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 #endif
 
-	int rc, i, j;
+	int rc, i, j, csn_changed = 0;
 	ber_len_t len;
 
 	slap_callback cb = { NULL };
@@ -2934,13 +2933,7 @@ syncrepl_updateCookie(
 			if ( memcmp( syncCookie->ctxcsn[i].bv_val,
 				si->si_cookieState->cs_vals[j].bv_val, len ) > 0 ) {
 				mod.sml_values[j] = syncCookie->ctxcsn[i];
-				if ( BER_BVISNULL( &first ) ) {
-					first = syncCookie->ctxcsn[i];
-
-				} else if ( memcmp( syncCookie->ctxcsn[i].bv_val, first.bv_val, first.bv_len ) > 0 )
-				{
-					first = syncCookie->ctxcsn[i];
-				}
+				csn_changed = 1;
 			}
 			break;
 		}
@@ -2950,23 +2943,16 @@ syncrepl_updateCookie(
 				( mod.sml_numvals+2 )*sizeof(struct berval), op->o_tmpmemctx );
 			mod.sml_values[mod.sml_numvals++] = syncCookie->ctxcsn[i];
 			BER_BVZERO( &mod.sml_values[mod.sml_numvals] );
-			if ( BER_BVISNULL( &first ) ) {
-				first = syncCookie->ctxcsn[i];
-			} else if ( memcmp( syncCookie->ctxcsn[i].bv_val, first.bv_val, first.bv_len ) > 0 )
-			{
-				first = syncCookie->ctxcsn[i];
-			}
+			csn_changed = 1;
 		}
 	}
 	/* Should never happen, ITS#5065 */
-	if ( BER_BVISNULL( &first )) {
+	if ( !csn_changed ) {
 		ldap_pvt_thread_mutex_unlock( &si->si_cookieState->cs_mutex );
 		op->o_tmpfree( mod.sml_values, op->o_tmpmemctx );
 		return 0;
 	}
 	op->o_bd = si->si_wbe;
-	slap_queue_csn( op, &first );
-
 	op->o_tag = LDAP_REQ_MODIFY;
 
 	cb.sc_response = null_callback;