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
  41         if ( maxcsn ) {
  42                 BER_BVZERO( maxcsn );
  43         }
  44
  45         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
  46
  47         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
  48                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  49                         csne->ce_state = SLAP_CSN_COMMIT;
  50                         break;
  51                 }
  52         }
  53
  54         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
  55                 if ( csne->ce_state == SLAP_CSN_COMMIT ) committed_csne = csne;
  56                 if ( csne->ce_state == SLAP_CSN_PENDING ) break;
  57         }
  58
  59         if ( committed_csne && maxcsn ) *maxcsn = committed_csne->ce_csn;
  60         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
  61 }
  62
  63 void
  64 slap_rewind_commit_csn( Operation *op )
  65 {
  66         struct slap_csn_entry *csne;
  67
  68         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
  69
  70         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
  71                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  72                         csne->ce_state = SLAP_CSN_PENDING;
  73                         break;
  74                 }
  75         }
  76
  77         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
  78 }
  79
  80 void
  81 slap_graduate_commit_csn( Operation *op )
  82 {
  83         struct slap_csn_entry *csne;
  84
  85         if ( op == NULL ) return;
  86         if ( op->o_bd == NULL ) return;
  87
  88 #if 0
  89         /* it is NULL when we get here from the frontendDB;
  90          * alternate fix: initialize frontendDB like all other backends */
  91         assert( op->o_bd->be_pcl_mutexp != NULL );
  92 #endif
  93
  94         if ( op->o_bd->be_pcl_mutexp == NULL ) return;
  95
  96         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
  97
  98         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
  99                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
 100                         LDAP_TAILQ_REMOVE( op->o_bd->be_pending_csn_list,
 101                                 csne, ce_csn_link );
 102                         if ( op->o_csn.bv_val == csne->ce_csn.bv_val ) {
 103                                 BER_BVZERO( &op->o_csn );
 104                         }
 105                         ch_free( csne->ce_csn.bv_val );
 106                         ch_free( csne );
 107                         break;
 108                 }
 109         }
 110
 111         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
 112
 113         return;
 114 }
 115
 116 static struct berval ocbva[] = {
 117         BER_BVC("top"),
 118         BER_BVC("subentry"),
 119         BER_BVC("syncProviderSubentry"),
 120         BER_BVNULL
 121 };
 122
 123 Entry *
 124 slap_create_context_csn_entry(
 125         Backend *be,
 126         struct berval *context_csn )
 127 {
 128         Entry* e;
 129
 130         struct berval bv;
 131
 132         e = entry_alloc();
 133
 134         attr_merge( e, slap_schema.si_ad_objectClass,
 135                 ocbva, NULL );
 136         attr_merge_one( e, slap_schema.si_ad_structuralObjectClass,
 137                 &ocbva[1], NULL );
 138         attr_merge_one( e, slap_schema.si_ad_cn,
 139                 (struct berval *)&slap_ldapsync_bv, NULL );
 140
 141         if ( context_csn ) {
 142                 attr_merge_one( e, slap_schema.si_ad_contextCSN,
 143                         context_csn, NULL );
 144         }
 145
 146         BER_BVSTR( &bv, "{}" );
 147         attr_merge_one( e, slap_schema.si_ad_subtreeSpecification, &bv, NULL );
 148
 149         build_new_dn( &e->e_name, &be->be_nsuffix[0],
 150                 (struct berval *)&slap_ldapsync_cn_bv, NULL );
 151         ber_dupbv( &e->e_nname, &e->e_name );
 152
 153         return e;
 154 }
 155
 156 void
 157 slap_queue_csn(
 158         Operation *op,
 159         struct berval *csn )
 160 {
 161         struct slap_csn_entry *pending;
 162
 163         pending = (struct slap_csn_entry *) ch_calloc( 1,
 164                         sizeof( struct slap_csn_entry ));
 165         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
 166
 167         ber_dupbv( &pending->ce_csn, csn );
 168         ber_bvreplace_x( &op->o_csn, &pending->ce_csn, op->o_tmpmemctx );
 169         pending->ce_connid = op->o_connid;
 170         pending->ce_opid = op->o_opid;
 171         pending->ce_state = SLAP_CSN_PENDING;
 172         LDAP_TAILQ_INSERT_TAIL( op->o_bd->be_pending_csn_list,
 173                 pending, ce_csn_link );
 174         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
 175 }
 176
 177 int
 178 slap_get_csn(
 179         Operation *op,
 180         struct berval *csn,
 181         int manage_ctxcsn )
 182 {
 183         if ( csn == NULL ) return LDAP_OTHER;
 184
 185         /* gmtime doesn't always need a mutex, but lutil_csnstr does */
 186         ldap_pvt_thread_mutex_lock( &gmtime_mutex );
 187         csn->bv_len = lutil_csnstr( csn->bv_val, csn->bv_len, slap_serverID, 0 );
 188         ldap_pvt_thread_mutex_unlock( &gmtime_mutex );
 189
 190         if ( manage_ctxcsn )
 191                 slap_queue_csn( op, csn );
 192
 193         return LDAP_SUCCESS;
 194 }