git.sur5r.net Git - openldap/blob - servers/slapd/back-bdb/ctxcsn.c

   1 /* $OpenLDAP$ */
   2 /*
   3  * back-bdb Context CSN Management Routines
   4  */
   5 /* Copyright (c) 2003 by International Business Machines, Inc.
   6  *
   7  * International Business Machines, Inc. (hereinafter called IBM) grants
   8  * permission under its copyrights to use, copy, modify, and distribute this
   9  * Software with or without fee, provided that the above copyright notice and
  10  * all paragraphs of this notice appear in all copies, and that the name of IBM
  11  * not be used in connection with the marketing of any product incorporating
  12  * the Software or modifications thereof, without specific, written prior
  13  * permission.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES,
  16  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  17  * PARTICULAR PURPOSE.  IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL,
  18  * DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING
  19  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN
  20  * IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.
  21  */
  22
  23 #include "portable.h"
  24
  25 #include <stdio.h>
  26
  27 #include <ac/string.h>
  28 #include <ac/time.h>
  29
  30 #include "lutil.h"
  31 #include "back-bdb.h"
  32 #include "external.h"
  33
  34 int
  35 bdb_csn_commit(
  36         Operation *op,
  37         SlapReply *rs,
  38         DB_TXN *tid,
  39         EntryInfo *ei,
  40         EntryInfo **suffix_ei,
  41         Entry **ctxcsn_e,
  42         int *ctxcsn_added,
  43         u_int32_t locker
  44 )
  45 {
  46         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
  47         struct berval   ctxcsn_ndn = { 0, NULL };
  48         EntryInfo               *ctxcsn_ei = NULL;
  49         DB_LOCK                 ctxcsn_lock;
  50         struct berval   *max_committed_csn = NULL;
  51         DB_LOCK                 suffix_lock;
  52         int                             rc, ret;
  53         ID                              ctxcsn_id;
  54         Entry                   *e;
  55         char                    textbuf[SLAP_TEXT_BUFLEN];
  56         size_t                  textlen = sizeof textbuf;
  57         EntryInfo               *eip = NULL;
  58
  59         if ( ei ) {
  60                 e = ei->bei_e;
  61         }
  62
  63         build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0],
  64                 (struct berval *)&slap_ldapsync_cn_bv );
  65
  66         rc = bdb_dn2entry( op, tid, &ctxcsn_ndn, &ctxcsn_ei,
  67                                                            1, locker, &ctxcsn_lock );
  68
  69         *ctxcsn_e = ctxcsn_ei->bei_e;
  70
  71         max_committed_csn = slap_get_commit_csn( op );
  72
  73         if ( max_committed_csn == NULL ) {
  74                 return BDB_CSN_COMMIT;
  75         }
  76
  77         *ctxcsn_added = 0;
  78
  79         switch( rc ) {
  80         case 0:
  81                 if ( !*ctxcsn_e ) {
  82                         rs->sr_err = LDAP_OTHER;
  83                         rs->sr_text = "context csn not present";
  84                         ber_bvfree( max_committed_csn );
  85                         return BDB_CSN_ABORT;
  86                 } else {
  87                         Modifications mod;
  88                         struct berval modvals[2];
  89
  90                         modvals[0] = *max_committed_csn;
  91                         modvals[1].bv_val = NULL;
  92                         modvals[1].bv_len = 0;
  93
  94                         mod.sml_op = LDAP_MOD_REPLACE;
  95                         mod.sml_bvalues = modvals;
  96                         mod.sml_nvalues = NULL;
  97                         mod.sml_desc = slap_schema.si_ad_contextCSN;
  98                         mod.sml_type = mod.sml_desc->ad_cname;
  99                         mod.sml_next = NULL;
 100
 101                         bdb_cache_entry_db_relock( bdb->bi_dbenv, locker, ctxcsn_ei, 1, 0, &ctxcsn_lock );
 102
 103                         ret = bdb_modify_internal( op, tid, &mod, *ctxcsn_e,
 104                                                                         &rs->sr_text, textbuf, textlen );
 105                         ber_bvfree( max_committed_csn );
 106                         if ( ret != LDAP_SUCCESS ) {
 107 #ifdef NEW_LOGGING
 108                                 LDAP_LOG ( OPERATION, ERR,
 109                                                 "bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
 110 #else
 111                                 Debug( LDAP_DEBUG_TRACE,
 112                                                 "bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
 113 #endif
 114                                 switch( ret ) {
 115                                 case DB_LOCK_DEADLOCK:
 116                                 case DB_LOCK_NOTGRANTED:
 117                                         goto rewind;
 118                                 default:
 119                                         return BDB_CSN_ABORT;
 120                                 }
 121                         }
 122
 123                         ret = bdb_id2entry_update( op->o_bd, tid, *ctxcsn_e );
 124                         switch ( ret ) {
 125                         case 0 :
 126                                 break;
 127                         case DB_LOCK_DEADLOCK :
 128                         case DB_LOCK_NOTGRANTED :
 129                                 goto rewind;
 130                         default :
 131                                 rs->sr_err = ret;
 132                                 rs->sr_text = "context csn update failed";
 133                                 return BDB_CSN_ABORT;
 134                         }
 135                 }
 136                 break;
 137         case DB_NOTFOUND:
 138                 if ( op->o_tag == LDAP_REQ_ADD &&
 139                                                 be_issuffix( op->o_bd, &op->oq_add.rs_e->e_nname )) {
 140                         *suffix_ei = NULL;
 141                         eip = (EntryInfo *) ch_calloc( 1, sizeof( EntryInfo ));
 142                         eip->bei_id = op->oq_add.rs_e->e_id;
 143                 } else {
 144                         eip = *suffix_ei = ctxcsn_ei;
 145                 }
 146
 147                 /* This serializes add. But this case is very rare : only once. */
 148                 rs->sr_err = bdb_next_id( op->o_bd, tid, &ctxcsn_id );
 149                 if ( rs->sr_err != 0 ) {
 150 #ifdef NEW_LOGGING
 151                         LDAP_LOG ( OPERATION, ERR,
 152                                 "bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
 153 #else
 154                         Debug( LDAP_DEBUG_TRACE,
 155                                 "bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
 156 #endif
 157                         rs->sr_err = LDAP_OTHER;
 158                         rs->sr_text = "internal error";
 159                         return BDB_CSN_ABORT;
 160                 }
 161
 162                 *ctxcsn_e = slap_create_context_csn_entry( op->o_bd, max_committed_csn );
 163                 ber_bvfree( max_committed_csn );
 164                 (*ctxcsn_e)->e_id = ctxcsn_id;
 165                 *ctxcsn_added = 1;
 166
 167                 ret = bdb_dn2id_add( op, tid, eip, *ctxcsn_e );
 168                 switch ( ret ) {
 169                 case 0 :
 170                         break;
 171                 case DB_LOCK_DEADLOCK :
 172                 case DB_LOCK_NOTGRANTED :
 173                         goto rewind;
 174                 case DB_KEYEXIST :
 175                         rs->sr_err = LDAP_OTHER;
 176                         rs->sr_text = "context csn exists before contex prefix does";
 177                         return BDB_CSN_ABORT;
 178                 default :
 179                         rs->sr_err = LDAP_OTHER;
 180                         rs->sr_text = "context csn store failed";
 181                         return BDB_CSN_ABORT;
 182                 }
 183
 184                 if ( *suffix_ei == NULL ) {
 185                         ch_free( eip );
 186                 }
 187
 188                 ret = bdb_id2entry_add( op->o_bd, tid, *ctxcsn_e );
 189                 switch ( ret ) {
 190                 case 0 :
 191                         break;
 192                 case DB_LOCK_DEADLOCK :
 193                 case DB_LOCK_NOTGRANTED :
 194                         goto rewind;
 195                 default :
 196                         rs->sr_err = LDAP_OTHER;
 197                         rs->sr_text = "context csn store failed";
 198                         return BDB_CSN_ABORT;
 199                 }
 200                 ret = bdb_index_entry_add( op, tid, *ctxcsn_e );
 201                 switch ( ret ) {
 202                 case 0 :
 203                         break;
 204                 case DB_LOCK_DEADLOCK :
 205                 case DB_LOCK_NOTGRANTED :
 206                         goto rewind;
 207                 default :
 208                         rs->sr_err = LDAP_OTHER;
 209                         rs->sr_text = "context csn indexing failed";
 210                         return BDB_CSN_ABORT;
 211                 }
 212                 break;
 213         case DB_LOCK_DEADLOCK:
 214         case DB_LOCK_NOTGRANTED:
 215 #ifdef NEW_LOGGING
 216                 LDAP_LOG( OPERATION, ERR,
 217                                 "bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
 218 #else
 219                 Debug( LDAP_DEBUG_TRACE,
 220                                 "bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
 221 #endif
 222                 goto rewind;
 223         case LDAP_BUSY:
 224                 rs->sr_err = rc;
 225                 rs->sr_text = "ldap server busy";
 226                 return BDB_CSN_ABORT;
 227         default:
 228                 rs->sr_err = LDAP_OTHER;
 229                 rs->sr_text = "internal error";
 230                 return BDB_CSN_ABORT;
 231         }
 232
 233         return BDB_CSN_COMMIT;
 234
 235 rewind :
 236         slap_rewind_commit_csn( op );
 237         return BDB_CSN_RETRY;
 238 }
 239
 240 int
 241 bdb_get_commit_csn(
 242         Operation       *op,
 243         SlapReply       *rs,
 244         struct berval   **search_context_csn,
 245         u_int32_t       locker,
 246         DB_LOCK         *ctxcsn_lock
 247 )
 248 {
 249         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 250         struct berval ctxcsn_rdn = BER_BVNULL;
 251         struct berval ctxcsn_ndn = BER_BVNULL;
 252         struct berval csn = BER_BVNULL;
 253         struct berval ctx_nrdn = BER_BVC( "cn=ldapsync" );
 254         EntryInfo       *ctxcsn_ei = NULL;
 255         EntryInfo       *suffix_ei = NULL;
 256         Entry           *ctxcsn_e = NULL;
 257         DB_TXN          *ltid = NULL;
 258         Attribute       *csn_a;
 259         char            substr[67];
 260         char            gid[DB_XIDDATASIZE];
 261         char            csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
 262         int                     num_retries = 0;
 263         int                     ctxcsn_added = 0;
 264         int                     rc;
 265
 266         if ( op->o_sync_mode != SLAP_SYNC_NONE ) {
 267                 if ( op->o_bd->syncinfo ) {
 268                         sprintf( substr, "cn=syncrepl%d", op->o_bd->syncinfo->id );
 269                         ber_str2bv( substr, strlen( substr ), 0, &ctxcsn_rdn );
 270                         build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0], &ctxcsn_rdn );
 271                 } else {
 272                         ber_str2bv( "cn=ldapsync", strlen("cn=ldapsync"), 0, &ctxcsn_rdn );
 273                         build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0], &ctxcsn_rdn );
 274                 }
 275
 276 ctxcsn_retry :
 277                 rs->sr_err = bdb_dn2entry( op, NULL, &ctxcsn_ndn, &ctxcsn_ei,
 278                                                                         0, locker, ctxcsn_lock );
 279                 switch(rs->sr_err) {
 280                 case 0:
 281                         ch_free( ctxcsn_ndn.bv_val );
 282                         if ( ctxcsn_ei ) {
 283                                 ctxcsn_e = ctxcsn_ei->bei_e;
 284                         }
 285                         break;
 286         case LDAP_BUSY:
 287                         ch_free( ctxcsn_ndn.bv_val );
 288                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 289                         return LDAP_BUSY;
 290         case DB_LOCK_DEADLOCK:
 291         case DB_LOCK_NOTGRANTED:
 292                         goto ctxcsn_retry;
 293         case DB_NOTFOUND:
 294                         if ( !op->o_bd->syncinfo ) {
 295                                 snprintf( gid, sizeof( gid ), "%s-%08lx-%08lx",
 296                                                         bdb_uuid.bv_val, (long) op->o_connid, (long) op->o_opid );
 297
 298                                 slap_get_csn( op, csnbuf, sizeof(csnbuf), &csn, 1 );
 299
 300                                 if ( 0 ) {
 301 txn_retry:
 302                                         rs->sr_err = TXN_ABORT( ltid );
 303                                         if ( rs->sr_err != 0 ) {
 304                                                 rs->sr_err = LDAP_OTHER;
 305                                                 return rs->sr_err;
 306                                         }
 307
 308                                         bdb_trans_backoff( ++num_retries );
 309                                         ldap_pvt_thread_yield();
 310                                 }
 311                                 rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, NULL, &ltid, bdb->bi_db_opflags );
 312                                 if ( rs->sr_err != 0 ) {
 313                                         rs->sr_err = LDAP_OTHER;
 314                                         return rs->sr_err;
 315                                 }
 316
 317                                 rs->sr_err = bdb_csn_commit( op, rs, ltid, NULL, &suffix_ei,
 318                                                                                 &ctxcsn_e, &ctxcsn_added, locker );
 319                                 switch( rs->sr_err ) {
 320                                 case BDB_CSN_ABORT:
 321                                         LOCK_ID_FREE( bdb->bi_dbenv, locker );
 322                                         return LDAP_OTHER;
 323                                 case BDB_CSN_RETRY:
 324                                         goto txn_retry;
 325                                 }
 326
 327                                 rs->sr_err = TXN_PREPARE( ltid, gid );
 328                                 if ( rs->sr_err != 0 ) {
 329                                         rs->sr_err = LDAP_OTHER;
 330                                         return rs->sr_err;
 331                                 }
 332
 333                                 bdb_cache_add( bdb, suffix_ei, ctxcsn_e, &ctx_nrdn, locker );
 334
 335                                 rs->sr_err = TXN_COMMIT( ltid, 0 );
 336                                 if ( rs->sr_err != 0 ) {
 337                                         rs->sr_err = LDAP_OTHER;
 338                                         return rs->sr_err;
 339                                 }
 340
 341                                 ctxcsn_ei = NULL;
 342                                 rs->sr_err = bdb_dn2entry( op, NULL, &ctxcsn_ndn, &ctxcsn_ei,
 343                                                                                 0, locker, ctxcsn_lock );
 344                                 ch_free( ctxcsn_ndn.bv_val );
 345
 346                                 if ( ctxcsn_ei ) {
 347                                         ctxcsn_e = ctxcsn_ei->bei_e;
 348                                 }
 349                         } else {
 350                                 LOCK_ID_FREE( bdb->bi_dbenv, locker );
 351                                 return LDAP_OTHER;
 352                         }
 353                         break;
 354
 355                 default:
 356                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 357                         return LDAP_OTHER;
 358                 }
 359
 360                 if ( ctxcsn_e ) {
 361                         if ( op->o_bd->syncinfo ) {
 362                                 csn_a = attr_find( ctxcsn_e->e_attrs, slap_schema.si_ad_syncreplCookie );
 363                         } else {
 364                                 csn_a = attr_find( ctxcsn_e->e_attrs, slap_schema.si_ad_contextCSN );
 365                         }
 366                         if ( csn_a ) {
 367                                 *search_context_csn = ber_dupbv( NULL, &csn_a->a_vals[0] );
 368                         } else {
 369                                 *search_context_csn = NULL;
 370                         }
 371                 } else {
 372                         *search_context_csn = NULL;
 373                 }
 374         }
 375
 376         return LDAP_SUCCESS;
 377 }