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 2003-2006 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
  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                         if ( curcsn ) *curcsn = csne->ce_csn;
  50                         csne->ce_state = SLAP_CSN_COMMIT;
  51                         break;
  52                 }
  53         }
  54
  55         LDAP_TAILQ_FOREACH( csne, op->o_bd->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( op->o_bd->be_pcl_mutexp );
  62 }
  63
  64 void
  65 slap_rewind_commit_csn( Operation *op )
  66 {
  67         struct slap_csn_entry *csne;
  68
  69         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
  70
  71         LDAP_TAILQ_FOREACH( csne, op->o_bd->be_pending_csn_list, ce_csn_link ) {
  72                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  73                         csne->ce_state = SLAP_CSN_PENDING;
  74                         break;
  75                 }
  76         }
  77
  78         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
  79 }
  80
  81 void
  82 slap_graduate_commit_csn( Operation *op )
  83 {
  84         struct slap_csn_entry *csne;
  85
  86         if ( op == NULL ) return;
  87         if ( op->o_bd == NULL ) return;
  88
  89 #if 0
  90         /* it is NULL when we get here from the frontendDB;
  91          * alternate fix: initialize frontendDB like all other backends */
  92         assert( op->o_bd->be_pcl_mutexp != NULL );
  93 #endif
  94
  95         if ( op->o_bd->be_pcl_mutexp == NULL ) return;
  96
  97         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
  98
  99         LDAP_TAILQ_FOREACH( csne, op->o_bd->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( op->o_bd->be_pending_csn_list,
 102                                 csne, ce_csn_link );
 103                         if ( op->o_csn.bv_val == csne->ce_csn.bv_val ) {
 104                                 BER_BVZERO( &op->o_csn );
 105                         }
 106                         ch_free( csne->ce_csn.bv_val );
 107                         ch_free( csne );
 108                         break;
 109                 }
 110         }
 111
 112         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
 113
 114         return;
 115 }
 116
 117 static struct berval ocbva[] = {
 118         BER_BVC("top"),
 119         BER_BVC("subentry"),
 120         BER_BVC("syncProviderSubentry"),
 121         BER_BVNULL
 122 };
 123
 124 Entry *
 125 slap_create_context_csn_entry(
 126         Backend *be,
 127         struct berval *context_csn )
 128 {
 129         Entry* e;
 130
 131         struct berval bv;
 132
 133         e = (Entry *) ch_calloc( 1, sizeof( Entry ));
 134
 135         attr_merge( e, slap_schema.si_ad_objectClass,
 136                 ocbva, NULL );
 137         attr_merge_one( e, slap_schema.si_ad_structuralObjectClass,
 138                 &ocbva[1], NULL );
 139         attr_merge_one( e, slap_schema.si_ad_cn,
 140                 (struct berval *)&slap_ldapsync_bv, NULL );
 141
 142         if ( context_csn ) {
 143                 attr_merge_one( e, slap_schema.si_ad_contextCSN,
 144                         context_csn, NULL );
 145         }
 146
 147         BER_BVSTR( &bv, "{}" );
 148         attr_merge_one( e, slap_schema.si_ad_subtreeSpecification, &bv, NULL );
 149
 150         build_new_dn( &e->e_name, &be->be_nsuffix[0],
 151                 (struct berval *)&slap_ldapsync_cn_bv, NULL );
 152         ber_dupbv( &e->e_nname, &e->e_name );
 153
 154         return e;
 155 }
 156
 157 void
 158 slap_queue_csn(
 159         Operation *op,
 160         struct berval *csn )
 161 {
 162         struct slap_csn_entry *pending;
 163
 164         pending = (struct slap_csn_entry *) ch_calloc( 1,
 165                         sizeof( struct slap_csn_entry ));
 166         ldap_pvt_thread_mutex_lock( op->o_bd->be_pcl_mutexp );
 167
 168         ber_dupbv( &pending->ce_csn, csn );
 169         ber_bvreplace_x( &op->o_csn, &pending->ce_csn, op->o_tmpmemctx );
 170         pending->ce_connid = op->o_connid;
 171         pending->ce_opid = op->o_opid;
 172         pending->ce_state = SLAP_CSN_PENDING;
 173         LDAP_TAILQ_INSERT_TAIL( op->o_bd->be_pending_csn_list,
 174                 pending, ce_csn_link );
 175         ldap_pvt_thread_mutex_unlock( op->o_bd->be_pcl_mutexp );
 176 }
 177
 178 int
 179 slap_get_csn(
 180         Operation *op,
 181         struct berval *csn,
 182         int manage_ctxcsn )
 183 {
 184         if ( csn == NULL ) return LDAP_OTHER;
 185
 186 #ifndef HAVE_GMTIME_R
 187         ldap_pvt_thread_mutex_lock( &gmtime_mutex );
 188 #endif
 189         csn->bv_len = lutil_csnstr( csn->bv_val, csn->bv_len, 0, 0 );
 190 #ifndef HAVE_GMTIME_R
 191         ldap_pvt_thread_mutex_unlock( &gmtime_mutex );
 192 #endif
 193
 194         if ( manage_ctxcsn )
 195                 slap_queue_csn( op, csn );
 196
 197         return LDAP_SUCCESS;
 198 }