git.sur5r.net Git - openldap/blob - servers/slapd/ctxcsn.c

   1 /* ctxcsn.c -- Context CSN Management Routines */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2003-2008 The OpenLDAP Foundation.
   6  * Portions Copyright 2003 IBM Corporation.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17
  18 #include "portable.h"
  19
  20 #include <stdio.h>
  21
  22 #include <ac/string.h>
  23 #include <ac/socket.h>
  24
  25 #include "lutil.h"
  26 #include "slap.h"
  27 #include "lutil_ldap.h"
  28
  29 const struct berval slap_ldapsync_bv = BER_BVC("ldapsync");
  30 const struct berval slap_ldapsync_cn_bv = BER_BVC("cn=ldapsync");
  31 int slap_serverID;
  32
  33 void
  34 slap_get_commit_csn(
  35         Operation *op,
  36         struct berval *maxcsn
  37 )
  38 {
  39         struct slap_csn_entry *csne, *committed_csne = NULL;
  40         BackendDB *be = op->o_bd->bd_self;
  41
  42         if ( maxcsn ) {
  43                 BER_BVZERO( maxcsn );
  44         }
  45
  46         ldap_pvt_thread_mutex_lock( be->be_pcl_mutexp );
  47
  48         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  49                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  50                         csne->ce_state = SLAP_CSN_COMMIT;
  51                         break;
  52                 }
  53         }
  54
  55         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  56                 if ( csne->ce_state == SLAP_CSN_COMMIT ) committed_csne = csne;
  57                 if ( csne->ce_state == SLAP_CSN_PENDING ) break;
  58         }
  59
  60         if ( committed_csne && maxcsn ) *maxcsn = committed_csne->ce_csn;
  61         ldap_pvt_thread_mutex_unlock( be->be_pcl_mutexp );
  62 }
  63
  64 void
  65 slap_rewind_commit_csn( Operation *op )
  66 {
  67         struct slap_csn_entry *csne;
  68         BackendDB *be = op->o_bd->bd_self;
  69
  70         ldap_pvt_thread_mutex_lock( be->be_pcl_mutexp );
  71
  72         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  73                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  74                         csne->ce_state = SLAP_CSN_PENDING;
  75                         break;
  76                 }
  77         }
  78
  79         ldap_pvt_thread_mutex_unlock( be->be_pcl_mutexp );
  80 }
  81
  82 void
  83 slap_graduate_commit_csn( Operation *op )
  84 {
  85         struct slap_csn_entry *csne;
  86         BackendDB *be;
  87
  88         if ( op == NULL ) return;
  89         if ( op->o_bd == NULL ) return;
  90         be = op->o_bd->bd_self;
  91
  92 #if 0
  93         /* it is NULL when we get here from the frontendDB;
  94          * alternate fix: initialize frontendDB like all other backends */
  95         assert( op->o_bd->be_pcl_mutexp != NULL );
  96 #endif
  97
  98         if ( be->be_pcl_mutexp == NULL ) return;
  99
 100         ldap_pvt_thread_mutex_lock( be->be_pcl_mutexp );
 101
 102         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
 103                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
 104                         LDAP_TAILQ_REMOVE( be->be_pending_csn_list,
 105                                 csne, ce_csn_link );
 106                         Debug( LDAP_DEBUG_SYNC, "slap_graduate_commit_csn: removing %p %s\n",
 107                                 csne->ce_csn.bv_val, csne->ce_csn.bv_val, 0 );
 108                         if ( op->o_csn.bv_val == csne->ce_csn.bv_val ) {
 109                                 BER_BVZERO( &op->o_csn );
 110                         }
 111                         ch_free( csne->ce_csn.bv_val );
 112                         ch_free( csne );
 113                         break;
 114                 }
 115         }
 116
 117         ldap_pvt_thread_mutex_unlock( be->be_pcl_mutexp );
 118
 119         return;
 120 }
 121
 122 static struct berval ocbva[] = {
 123         BER_BVC("top"),
 124         BER_BVC("subentry"),
 125         BER_BVC("syncProviderSubentry"),
 126         BER_BVNULL
 127 };
 128
 129 Entry *
 130 slap_create_context_csn_entry(
 131         Backend *be,
 132         struct berval *context_csn )
 133 {
 134         Entry* e;
 135
 136         struct berval bv;
 137
 138         e = entry_alloc();
 139
 140         attr_merge( e, slap_schema.si_ad_objectClass,
 141                 ocbva, NULL );
 142         attr_merge_one( e, slap_schema.si_ad_structuralObjectClass,
 143                 &ocbva[1], NULL );
 144         attr_merge_one( e, slap_schema.si_ad_cn,
 145                 (struct berval *)&slap_ldapsync_bv, NULL );
 146
 147         if ( context_csn ) {
 148                 attr_merge_one( e, slap_schema.si_ad_contextCSN,
 149                         context_csn, NULL );
 150         }
 151
 152         BER_BVSTR( &bv, "{}" );
 153         attr_merge_one( e, slap_schema.si_ad_subtreeSpecification, &bv, NULL );
 154
 155         build_new_dn( &e->e_name, &be->be_nsuffix[0],
 156                 (struct berval *)&slap_ldapsync_cn_bv, NULL );
 157         ber_dupbv( &e->e_nname, &e->e_name );
 158
 159         return e;
 160 }
 161
 162 void
 163 slap_queue_csn(
 164         Operation *op,
 165         struct berval *csn )
 166 {
 167         struct slap_csn_entry *pending;
 168         BackendDB *be = op->o_bd->bd_self;
 169
 170         pending = (struct slap_csn_entry *) ch_calloc( 1,
 171                         sizeof( struct slap_csn_entry ));
 172
 173         Debug( LDAP_DEBUG_SYNC, "slap_queue_csn: queing %p %s\n", csn->bv_val, csn->bv_val, 0 );
 174
 175         ldap_pvt_thread_mutex_lock( be->be_pcl_mutexp );
 176
 177         ber_dupbv( &pending->ce_csn, csn );
 178         ber_bvreplace_x( &op->o_csn, &pending->ce_csn, op->o_tmpmemctx );
 179         pending->ce_connid = op->o_connid;
 180         pending->ce_opid = op->o_opid;
 181         pending->ce_state = SLAP_CSN_PENDING;
 182         LDAP_TAILQ_INSERT_TAIL( be->be_pending_csn_list,
 183                 pending, ce_csn_link );
 184         ldap_pvt_thread_mutex_unlock( be->be_pcl_mutexp );
 185 }
 186
 187 int
 188 slap_get_csn(
 189         Operation *op,
 190         struct berval *csn,
 191         int manage_ctxcsn )
 192 {
 193         if ( csn == NULL ) return LDAP_OTHER;
 194
 195         /* gmtime doesn't always need a mutex, but lutil_csnstr does */
 196         ldap_pvt_thread_mutex_lock( &gmtime_mutex );
 197         csn->bv_len = lutil_csnstr( csn->bv_val, csn->bv_len, slap_serverID, 0 );
 198         ldap_pvt_thread_mutex_unlock( &gmtime_mutex );
 199
 200         if ( manage_ctxcsn )
 201                 slap_queue_csn( op, csn );
 202
 203         return LDAP_SUCCESS;
 204 }