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 int slap_serverID;
  30
  31 /* maxcsn->bv_val must point to a char buf[LDAP_PVT_CSNSTR_BUFSIZE] */
  32 void
  33 slap_get_commit_csn(
  34         Operation *op,
  35         struct berval *maxcsn,
  36         int *foundit
  37 )
  38 {
  39         struct slap_csn_entry *csne, *committed_csne = NULL;
  40         BackendDB *be = op->o_bd->bd_self;
  41         int sid = -1;
  42
  43         if ( maxcsn ) {
  44                 assert( maxcsn->bv_val != NULL );
  45                 assert( maxcsn->bv_len >= LDAP_PVT_CSNSTR_BUFSIZE );
  46         }
  47         if ( foundit ) {
  48                 *foundit = 0;
  49         }
  50
  51         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
  52
  53         if ( !BER_BVISEMPTY( &op->o_csn )) {
  54                 sid = slap_parse_csn_sid( &op->o_csn );
  55         }
  56
  57         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  58                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  59                         csne->ce_state = SLAP_CSN_COMMIT;
  60                         if ( foundit ) *foundit = 1;
  61                         break;
  62                 }
  63         }
  64
  65         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  66                 if ( sid != -1 && sid == csne->ce_sid ) {
  67                         if ( csne->ce_state == SLAP_CSN_COMMIT ) committed_csne = csne;
  68                         if ( csne->ce_state == SLAP_CSN_PENDING ) break;
  69                 }
  70         }
  71
  72         if ( maxcsn ) {
  73                 if ( committed_csne ) {
  74                         if ( committed_csne->ce_csn.bv_len < maxcsn->bv_len )
  75                                 maxcsn->bv_len = committed_csne->ce_csn.bv_len;
  76                         AC_MEMCPY( maxcsn->bv_val, committed_csne->ce_csn.bv_val,
  77                                 maxcsn->bv_len+1 );
  78                 } else {
  79                         maxcsn->bv_len = 0;
  80                         maxcsn->bv_val[0] = 0;
  81                 }
  82         }
  83         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
  84 }
  85
  86 void
  87 slap_rewind_commit_csn( Operation *op )
  88 {
  89         struct slap_csn_entry *csne;
  90         BackendDB *be = op->o_bd->bd_self;
  91
  92         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
  93
  94         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  95                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  96                         csne->ce_state = SLAP_CSN_PENDING;
  97                         break;
  98                 }
  99         }
 100
 101         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
 102 }
 103
 104 void
 105 slap_graduate_commit_csn( Operation *op )
 106 {
 107         struct slap_csn_entry *csne;
 108         BackendDB *be;
 109
 110         if ( op == NULL ) return;
 111         if ( op->o_bd == NULL ) return;
 112         be = op->o_bd->bd_self;
 113
 114         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
 115
 116         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
 117                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
 118                         LDAP_TAILQ_REMOVE( be->be_pending_csn_list,
 119                                 csne, ce_csn_link );
 120                         Debug( LDAP_DEBUG_SYNC, "slap_graduate_commit_csn: removing %p %s\n",
 121                                 csne->ce_csn.bv_val, csne->ce_csn.bv_val, 0 );
 122                         if ( op->o_csn.bv_val == csne->ce_csn.bv_val ) {
 123                                 BER_BVZERO( &op->o_csn );
 124                         }
 125                         ch_free( csne->ce_csn.bv_val );
 126                         ch_free( csne );
 127                         break;
 128                 }
 129         }
 130
 131         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
 132
 133         return;
 134 }
 135
 136 void
 137 slap_queue_csn(
 138         Operation *op,
 139         struct berval *csn )
 140 {
 141         struct slap_csn_entry *pending;
 142         BackendDB *be = op->o_bd->bd_self;
 143
 144         pending = (struct slap_csn_entry *) ch_calloc( 1,
 145                         sizeof( struct slap_csn_entry ));
 146
 147         Debug( LDAP_DEBUG_SYNC, "slap_queue_csn: queing %p %s\n", csn->bv_val, csn->bv_val, 0 );
 148
 149         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
 150
 151         ber_dupbv( &pending->ce_csn, csn );
 152         ber_bvreplace_x( &op->o_csn, &pending->ce_csn, op->o_tmpmemctx );
 153         pending->ce_sid = slap_parse_csn_sid( csn );
 154         pending->ce_connid = op->o_connid;
 155         pending->ce_opid = op->o_opid;
 156         pending->ce_state = SLAP_CSN_PENDING;
 157         LDAP_TAILQ_INSERT_TAIL( be->be_pending_csn_list,
 158                 pending, ce_csn_link );
 159         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
 160 }
 161
 162 int
 163 slap_get_csn(
 164         Operation *op,
 165         struct berval *csn,
 166         int manage_ctxcsn )
 167 {
 168         if ( csn == NULL ) return LDAP_OTHER;
 169
 170         csn->bv_len = ldap_pvt_csnstr( csn->bv_val, csn->bv_len, slap_serverID, 0 );
 171         if ( manage_ctxcsn )
 172                 slap_queue_csn( op, csn );
 173
 174         return LDAP_SUCCESS;
 175 }