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 2003-2005 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         struct berval *curcsn
  37 )
  38 {
  39         struct slap_csn_entry *csne, *committed_csne = NULL;
  40         int i = 0;
  41
  42         if ( maxcsn ) {
  43                 BER_BVZERO( maxcsn );
  44         }
  45
  46         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
  47
  48         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
  49                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  50                         if ( curcsn ) *curcsn = csne->ce_csn;
  51                         csne->ce_state = SLAP_CSN_COMMIT;
  52                         break;
  53                 }
  54         }
  55
  56         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
  57                 if ( csne->ce_state == SLAP_CSN_COMMIT ) committed_csne = csne;
  58                 if ( csne->ce_state == SLAP_CSN_PENDING ) break;
  59         }
  60
  61         if ( committed_csne && maxcsn ) *maxcsn = committed_csne->ce_csn;
  62         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
  63 }
  64
  65 void
  66 slap_rewind_commit_csn( Operation *op )
  67 {
  68         struct slap_csn_entry *csne;
  69
  70         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
  71
  72         LDAP_TAILQ_FOREACH( csne, op->o_bd->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( op->o_bd->be_pcl_mutexp );
  80 }
  81
  82 void
  83 slap_graduate_commit_csn( Operation *op )
  84 {
  85         struct slap_csn_entry *csne;
  86
  87         if ( op == NULL ) return;
  88         if ( op->o_bd == NULL ) return;
  89
  90 #if 0
  91         /* it is NULL when we get here from the frontendDB;
  92          * alternate fix: initialize frontendDB like all other backends */
  93         assert( op->o_bd->be_pcl_mutexp != NULL );
  94 #endif
  95
  96         if ( op->o_bd->be_pcl_mutexp == NULL ) return;
  97
  98         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
  99
 100         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
 101                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
 102                         LDAP_TAILQ_REMOVE( op->o_bd->be_pending_csn_list,
 103                                 csne, ce_csn_link );
 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         int rc;
 129
 130         struct berval bv;
 131
 132         e = (Entry *) ch_calloc( 1, sizeof( Entry ));
 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         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         char *csnbuf,
 180         int     len,
 181         struct berval *csn,
 182         int manage_ctxcsn )
 183 {
 184         if ( csn == NULL ) return LDAP_OTHER;
 185
 186         csn->bv_len = lutil_csnstr( csnbuf, len, 0, 0 );
 187         csn->bv_val = csnbuf;
 188
 189         if ( manage_ctxcsn )
 190                 slap_queue_csn( op, csn );
 191
 192         return LDAP_SUCCESS;
 193 }