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 2003-2009 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 /* maxcsn->bv_val must point to a char buf[LDAP_LUTIL_CSNSTR_BUFSIZE] */
  34 void
  35 slap_get_commit_csn(
  36         Operation *op,
  37         struct berval *maxcsn,
  38         int *foundit
  39 )
  40 {
  41         struct slap_csn_entry *csne, *committed_csne = NULL;
  42         BackendDB *be = op->o_bd->bd_self;
  43
  44         if ( maxcsn ) {
  45                 assert( maxcsn->bv_val != NULL );
  46                 assert( maxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE );
  47         }
  48         if ( foundit ) {
  49                 *foundit = 0;
  50         }
  51
  52         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
  53
  54         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  55                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  56                         csne->ce_state = SLAP_CSN_COMMIT;
  57                         if ( foundit ) *foundit = 1;
  58                         break;
  59                 }
  60         }
  61
  62         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  63                 if ( csne->ce_state == SLAP_CSN_COMMIT ) committed_csne = csne;
  64                 if ( csne->ce_state == SLAP_CSN_PENDING ) break;
  65         }
  66
  67         if ( maxcsn ) {
  68                 if ( committed_csne ) {
  69                         if ( committed_csne->ce_csn.bv_len < maxcsn->bv_len )
  70                                 maxcsn->bv_len = committed_csne->ce_csn.bv_len;
  71                         AC_MEMCPY( maxcsn->bv_val, committed_csne->ce_csn.bv_val,
  72                                 maxcsn->bv_len+1 );
  73                 } else {
  74                         maxcsn->bv_len = 0;
  75                         maxcsn->bv_val[0] = 0;
  76                 }
  77         }
  78         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
  79 }
  80
  81 void
  82 slap_rewind_commit_csn( Operation *op )
  83 {
  84         struct slap_csn_entry *csne;
  85         BackendDB *be = op->o_bd->bd_self;
  86
  87         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
  88
  89         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  90                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  91                         csne->ce_state = SLAP_CSN_PENDING;
  92                         break;
  93                 }
  94         }
  95
  96         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
  97 }
  98
  99 void
 100 slap_graduate_commit_csn( Operation *op )
 101 {
 102         struct slap_csn_entry *csne;
 103         BackendDB *be;
 104
 105         if ( op == NULL ) return;
 106         if ( op->o_bd == NULL ) return;
 107         be = op->o_bd->bd_self;
 108
 109         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
 110
 111         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
 112                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
 113                         LDAP_TAILQ_REMOVE( be->be_pending_csn_list,
 114                                 csne, ce_csn_link );
 115                         Debug( LDAP_DEBUG_SYNC, "slap_graduate_commit_csn: removing %p %s\n",
 116                                 csne->ce_csn.bv_val, csne->ce_csn.bv_val, 0 );
 117                         if ( op->o_csn.bv_val == csne->ce_csn.bv_val ) {
 118                                 BER_BVZERO( &op->o_csn );
 119                         }
 120                         ch_free( csne->ce_csn.bv_val );
 121                         ch_free( csne );
 122                         break;
 123                 }
 124         }
 125
 126         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
 127
 128         return;
 129 }
 130
 131 static struct berval ocbva[] = {
 132         BER_BVC("top"),
 133         BER_BVC("subentry"),
 134         BER_BVC("syncProviderSubentry"),
 135         BER_BVNULL
 136 };
 137
 138 Entry *
 139 slap_create_context_csn_entry(
 140         Backend *be,
 141         struct berval *context_csn )
 142 {
 143         Entry* e;
 144
 145         struct berval bv;
 146
 147         e = entry_alloc();
 148
 149         attr_merge( e, slap_schema.si_ad_objectClass,
 150                 ocbva, NULL );
 151         attr_merge_one( e, slap_schema.si_ad_structuralObjectClass,
 152                 &ocbva[1], NULL );
 153         attr_merge_one( e, slap_schema.si_ad_cn,
 154                 (struct berval *)&slap_ldapsync_bv, NULL );
 155
 156         if ( context_csn ) {
 157                 attr_merge_one( e, slap_schema.si_ad_contextCSN,
 158                         context_csn, NULL );
 159         }
 160
 161         BER_BVSTR( &bv, "{}" );
 162         attr_merge_one( e, slap_schema.si_ad_subtreeSpecification, &bv, NULL );
 163
 164         build_new_dn( &e->e_name, &be->be_nsuffix[0],
 165                 (struct berval *)&slap_ldapsync_cn_bv, NULL );
 166         ber_dupbv( &e->e_nname, &e->e_name );
 167
 168         return e;
 169 }
 170
 171 void
 172 slap_queue_csn(
 173         Operation *op,
 174         struct berval *csn )
 175 {
 176         struct slap_csn_entry *pending;
 177         BackendDB *be = op->o_bd->bd_self;
 178
 179         pending = (struct slap_csn_entry *) ch_calloc( 1,
 180                         sizeof( struct slap_csn_entry ));
 181
 182         Debug( LDAP_DEBUG_SYNC, "slap_queue_csn: queing %p %s\n", csn->bv_val, csn->bv_val, 0 );
 183
 184         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
 185
 186         ber_dupbv( &pending->ce_csn, csn );
 187         ber_bvreplace_x( &op->o_csn, &pending->ce_csn, op->o_tmpmemctx );
 188         pending->ce_connid = op->o_connid;
 189         pending->ce_opid = op->o_opid;
 190         pending->ce_state = SLAP_CSN_PENDING;
 191         LDAP_TAILQ_INSERT_TAIL( be->be_pending_csn_list,
 192                 pending, ce_csn_link );
 193         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
 194 }
 195
 196 int
 197 slap_get_csn(
 198         Operation *op,
 199         struct berval *csn,
 200         int manage_ctxcsn )
 201 {
 202         if ( csn == NULL ) return LDAP_OTHER;
 203
 204         /* gmtime doesn't always need a mutex, but lutil_csnstr does */
 205         ldap_pvt_thread_mutex_lock( &gmtime_mutex );
 206         csn->bv_len = lutil_csnstr( csn->bv_val, csn->bv_len, slap_serverID, 0 );
 207         if ( manage_ctxcsn )
 208                 slap_queue_csn( op, csn );
 209
 210         ldap_pvt_thread_mutex_unlock( &gmtime_mutex );
 211
 212         return LDAP_SUCCESS;
 213 }