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 2003-2007 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
  32 void
  33 slap_get_commit_csn(
  34         Operation *op,
  35         struct berval *maxcsn
  36 )
  37 {
  38         struct slap_csn_entry *csne, *committed_csne = NULL;
  39
  40         if ( maxcsn ) {
  41                 BER_BVZERO( maxcsn );
  42         }
  43
  44         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
  45
  46         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
  47                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  48                         csne->ce_state = SLAP_CSN_COMMIT;
  49                         break;
  50                 }
  51         }
  52
  53         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
  54                 if ( csne->ce_state == SLAP_CSN_COMMIT ) committed_csne = csne;
  55                 if ( csne->ce_state == SLAP_CSN_PENDING ) break;
  56         }
  57
  58         if ( committed_csne && maxcsn ) *maxcsn = committed_csne->ce_csn;
  59         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
  60 }
  61
  62 void
  63 slap_rewind_commit_csn( Operation *op )
  64 {
  65         struct slap_csn_entry *csne;
  66
  67         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
  68
  69         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
  70                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  71                         csne->ce_state = SLAP_CSN_PENDING;
  72                         break;
  73                 }
  74         }
  75
  76         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
  77 }
  78
  79 void
  80 slap_graduate_commit_csn( Operation *op )
  81 {
  82         struct slap_csn_entry *csne;
  83
  84         if ( op == NULL ) return;
  85         if ( op->o_bd == NULL ) return;
  86
  87 #if 0
  88         /* it is NULL when we get here from the frontendDB;
  89          * alternate fix: initialize frontendDB like all other backends */
  90         assert( op->o_bd->be_pcl_mutexp != NULL );
  91 #endif
  92
  93         if ( op->o_bd->be_pcl_mutexp == NULL ) return;
  94
  95         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
  96
  97         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
  98                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  99                         LDAP_TAILQ_REMOVE( op->o_bd->be_pending_csn_list,
 100                                 csne, ce_csn_link );
 101                         if ( op->o_csn.bv_val == csne->ce_csn.bv_val ) {
 102                                 BER_BVZERO( &op->o_csn );
 103                         }
 104                         ch_free( csne->ce_csn.bv_val );
 105                         ch_free( csne );
 106                         break;
 107                 }
 108         }
 109
 110         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
 111
 112         return;
 113 }
 114
 115 static struct berval ocbva[] = {
 116         BER_BVC("top"),
 117         BER_BVC("subentry"),
 118         BER_BVC("syncProviderSubentry"),
 119         BER_BVNULL
 120 };
 121
 122 Entry *
 123 slap_create_context_csn_entry(
 124         Backend *be,
 125         struct berval *context_csn )
 126 {
 127         Entry* e;
 128
 129         struct berval bv;
 130
 131         e = (Entry *) ch_calloc( 1, sizeof( Entry ));
 132
 133         attr_merge( e, slap_schema.si_ad_objectClass,
 134                 ocbva, NULL );
 135         attr_merge_one( e, slap_schema.si_ad_structuralObjectClass,
 136                 &ocbva[1], NULL );
 137         attr_merge_one( e, slap_schema.si_ad_cn,
 138                 (struct berval *)&slap_ldapsync_bv, NULL );
 139
 140         if ( context_csn ) {
 141                 attr_merge_one( e, slap_schema.si_ad_contextCSN,
 142                         context_csn, NULL );
 143         }
 144
 145         BER_BVSTR( &bv, "{}" );
 146         attr_merge_one( e, slap_schema.si_ad_subtreeSpecification, &bv, NULL );
 147
 148         build_new_dn( &e->e_name, &be->be_nsuffix[0],
 149                 (struct berval *)&slap_ldapsync_cn_bv, NULL );
 150         ber_dupbv( &e->e_nname, &e->e_name );
 151
 152         return e;
 153 }
 154
 155 void
 156 slap_queue_csn(
 157         Operation *op,
 158         struct berval *csn )
 159 {
 160         struct slap_csn_entry *pending;
 161
 162         pending = (struct slap_csn_entry *) ch_calloc( 1,
 163                         sizeof( struct slap_csn_entry ));
 164         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
 165
 166         ber_dupbv( &pending->ce_csn, csn );
 167         ber_dupbv_x( &op->o_csn, &pending->ce_csn, op->o_tmpmemctx );
 168         pending->ce_connid = op->o_connid;
 169         pending->ce_opid = op->o_opid;
 170         pending->ce_state = SLAP_CSN_PENDING;
 171         LDAP_TAILQ_INSERT_TAIL( op->o_bd->be_pending_csn_list,
 172                 pending, ce_csn_link );
 173         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
 174 }
 175
 176 int
 177 slap_get_csn(
 178         Operation *op,
 179         struct berval *csn,
 180         int manage_ctxcsn )
 181 {
 182         if ( csn == NULL ) return LDAP_OTHER;
 183
 184 #ifndef HAVE_GMTIME_R
 185         ldap_pvt_thread_mutex_lock( &gmtime_mutex );
 186 #endif
 187         csn->bv_len = lutil_csnstr( csn->bv_val, csn->bv_len, 0, 0 );
 188 #ifndef HAVE_GMTIME_R
 189         ldap_pvt_thread_mutex_unlock( &gmtime_mutex );
 190 #endif
 191
 192         if ( manage_ctxcsn )
 193                 slap_queue_csn( op, csn );
 194
 195         return LDAP_SUCCESS;
 196 }