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         int *foundit
  38 )
  39 {
  40         struct slap_csn_entry *csne, *committed_csne = NULL;
  41         BackendDB *be = op->o_bd->bd_self;
  42
  43         if ( maxcsn ) {
  44                 BER_BVZERO( maxcsn );
  45         }
  46         if ( foundit ) {
  47                 *foundit = 0;
  48         }
  49
  50         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
  51
  52         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  53                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  54                         csne->ce_state = SLAP_CSN_COMMIT;
  55                         if ( foundit ) *foundit = 1;
  56                         break;
  57                 }
  58         }
  59
  60         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  61                 if ( csne->ce_state == SLAP_CSN_COMMIT ) committed_csne = csne;
  62                 if ( csne->ce_state == SLAP_CSN_PENDING ) break;
  63         }
  64
  65         if ( committed_csne && maxcsn ) *maxcsn = committed_csne->ce_csn;
  66         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
  67 }
  68
  69 void
  70 slap_rewind_commit_csn( Operation *op )
  71 {
  72         struct slap_csn_entry *csne;
  73         BackendDB *be = op->o_bd->bd_self;
  74
  75         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
  76
  77         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  78                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  79                         csne->ce_state = SLAP_CSN_PENDING;
  80                         break;
  81                 }
  82         }
  83
  84         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
  85 }
  86
  87 void
  88 slap_graduate_commit_csn( Operation *op )
  89 {
  90         struct slap_csn_entry *csne;
  91         BackendDB *be;
  92
  93         if ( op == NULL ) return;
  94         if ( op->o_bd == NULL ) return;
  95         be = op->o_bd->bd_self;
  96
  97         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
  98
  99         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
 100                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
 101                         LDAP_TAILQ_REMOVE( be->be_pending_csn_list,
 102                                 csne, ce_csn_link );
 103                         Debug( LDAP_DEBUG_SYNC, "slap_graduate_commit_csn: removing %p %s\n",
 104                                 csne->ce_csn.bv_val, csne->ce_csn.bv_val, 0 );
 105                         if ( op->o_csn.bv_val == csne->ce_csn.bv_val ) {
 106                                 BER_BVZERO( &op->o_csn );
 107                         }
 108                         ch_free( csne->ce_csn.bv_val );
 109                         ch_free( csne );
 110                         break;
 111                 }
 112         }
 113
 114         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
 115
 116         return;
 117 }
 118
 119 static struct berval ocbva[] = {
 120         BER_BVC("top"),
 121         BER_BVC("subentry"),
 122         BER_BVC("syncProviderSubentry"),
 123         BER_BVNULL
 124 };
 125
 126 Entry *
 127 slap_create_context_csn_entry(
 128         Backend *be,
 129         struct berval *context_csn )
 130 {
 131         Entry* e;
 132
 133         struct berval bv;
 134
 135         e = entry_alloc();
 136
 137         attr_merge( e, slap_schema.si_ad_objectClass,
 138                 ocbva, NULL );
 139         attr_merge_one( e, slap_schema.si_ad_structuralObjectClass,
 140                 &ocbva[1], NULL );
 141         attr_merge_one( e, slap_schema.si_ad_cn,
 142                 (struct berval *)&slap_ldapsync_bv, NULL );
 143
 144         if ( context_csn ) {
 145                 attr_merge_one( e, slap_schema.si_ad_contextCSN,
 146                         context_csn, NULL );
 147         }
 148
 149         BER_BVSTR( &bv, "{}" );
 150         attr_merge_one( e, slap_schema.si_ad_subtreeSpecification, &bv, NULL );
 151
 152         build_new_dn( &e->e_name, &be->be_nsuffix[0],
 153                 (struct berval *)&slap_ldapsync_cn_bv, NULL );
 154         ber_dupbv( &e->e_nname, &e->e_name );
 155
 156         return e;
 157 }
 158
 159 void
 160 slap_queue_csn(
 161         Operation *op,
 162         struct berval *csn )
 163 {
 164         struct slap_csn_entry *pending;
 165         BackendDB *be = op->o_bd->bd_self;
 166
 167         pending = (struct slap_csn_entry *) ch_calloc( 1,
 168                         sizeof( struct slap_csn_entry ));
 169
 170         Debug( LDAP_DEBUG_SYNC, "slap_queue_csn: queing %p %s\n", csn->bv_val, csn->bv_val, 0 );
 171
 172         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
 173
 174         ber_dupbv( &pending->ce_csn, csn );
 175         ber_bvreplace_x( &op->o_csn, &pending->ce_csn, op->o_tmpmemctx );
 176         pending->ce_connid = op->o_connid;
 177         pending->ce_opid = op->o_opid;
 178         pending->ce_state = SLAP_CSN_PENDING;
 179         LDAP_TAILQ_INSERT_TAIL( be->be_pending_csn_list,
 180                 pending, ce_csn_link );
 181         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
 182 }
 183
 184 int
 185 slap_get_csn(
 186         Operation *op,
 187         struct berval *csn,
 188         int manage_ctxcsn )
 189 {
 190         if ( csn == NULL ) return LDAP_OTHER;
 191
 192         /* gmtime doesn't always need a mutex, but lutil_csnstr does */
 193         ldap_pvt_thread_mutex_lock( &gmtime_mutex );
 194         csn->bv_len = lutil_csnstr( csn->bv_val, csn->bv_len, slap_serverID, 0 );
 195         ldap_pvt_thread_mutex_unlock( &gmtime_mutex );
 196
 197         if ( manage_ctxcsn )
 198                 slap_queue_csn( op, csn );
 199
 200         return LDAP_SUCCESS;
 201 }