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

   1 /* ctxcsn.c -- back-bdb Context CSN Management Routines */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2003-2004 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/time.h>
  24
  25 #include "lutil.h"
  26 #include "back-bdb.h"
  27 #include "external.h"
  28
  29 int
  30 bdb_csn_commit(
  31         Operation *op,
  32         SlapReply *rs,
  33         DB_TXN *tid,
  34         EntryInfo *ei,
  35         EntryInfo **suffix_ei,
  36         Entry **ctxcsn_e,
  37         int *ctxcsn_added,
  38         u_int32_t locker
  39 )
  40 {
  41         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
  42         EntryInfo               *ctxcsn_ei = NULL;
  43         DB_LOCK                 ctxcsn_lock;
  44         struct berval   max_committed_csn;
  45         DB_LOCK                 suffix_lock;
  46         int                             rc, ret;
  47         ID                              ctxcsn_id;
  48         Entry                   *e;
  49         char                    textbuf[SLAP_TEXT_BUFLEN];
  50         size_t                  textlen = sizeof textbuf;
  51         EntryInfo               *eip = NULL;
  52
  53         assert( !BER_BVISNULL( &op->o_bd->be_context_csn ) );
  54
  55         if ( ei ) {
  56                 e = ei->bei_e;
  57         }
  58
  59         rc =  bdb_dn2entry( op, tid, &op->o_bd->be_context_csn, &ctxcsn_ei,
  60                         1, locker, &ctxcsn_lock );
  61         switch( rc ) {
  62         case 0:
  63                 break;
  64         case DB_LOCK_DEADLOCK:
  65         case DB_LOCK_NOTGRANTED:
  66                 return BDB_CSN_RETRY;
  67         default:
  68                 return BDB_CSN_ABORT;
  69         }
  70
  71         *ctxcsn_e = ctxcsn_ei->bei_e;
  72
  73         slap_get_commit_csn( op, &max_committed_csn );
  74
  75         if ( max_committed_csn.bv_val == NULL ) {
  76                 return BDB_CSN_COMMIT;
  77         }
  78
  79         *ctxcsn_added = 0;
  80
  81         switch( rc ) {
  82         case 0:
  83                 if ( !*ctxcsn_e ) {
  84                         rs->sr_err = LDAP_OTHER;
  85                         rs->sr_text = "context csn not present";
  86                         op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
  87                         return BDB_CSN_ABORT;
  88                 } else {
  89                         Modifications mod;
  90                         struct berval modvals[2];
  91                         Entry dummy;
  92
  93                         modvals[0] = max_committed_csn;
  94                         modvals[1].bv_val = NULL;
  95                         modvals[1].bv_len = 0;
  96
  97                         mod.sml_op = LDAP_MOD_REPLACE;
  98                         mod.sml_values = modvals;
  99                         mod.sml_nvalues = NULL;
 100                         mod.sml_desc = slap_schema.si_ad_contextCSN;
 101                         mod.sml_type = mod.sml_desc->ad_cname;
 102                         mod.sml_next = NULL;
 103
 104                         dummy = **ctxcsn_e;
 105                         ret = bdb_modify_internal( op, tid, &mod, &dummy,
 106                                                                         &rs->sr_text, textbuf, textlen );
 107                         op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
 108                         if ( ret != LDAP_SUCCESS ) {
 109 #ifdef NEW_LOGGING
 110                                 LDAP_LOG ( OPERATION, ERR,
 111                                                 "bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
 112 #else
 113                                 Debug( LDAP_DEBUG_TRACE,
 114                                                 "bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
 115 #endif
 116                                 switch( ret ) {
 117                                 case DB_LOCK_DEADLOCK:
 118                                 case DB_LOCK_NOTGRANTED:
 119                                         goto rewind;
 120                                 default:
 121                                         return BDB_CSN_ABORT;
 122                                 }
 123                         }
 124
 125                         ret = bdb_id2entry_update( op->o_bd, tid, &dummy );
 126                         switch ( ret ) {
 127                         case 0 :
 128                                 break;
 129                         case DB_LOCK_DEADLOCK :
 130                         case DB_LOCK_NOTGRANTED :
 131                                 goto rewind;
 132                         default :
 133                                 rs->sr_err = ret;
 134                                 rs->sr_text = "context csn update failed";
 135                                 return BDB_CSN_ABORT;
 136                         }
 137                         bdb_cache_modify( *ctxcsn_e, dummy.e_attrs, bdb->bi_dbenv, locker, &ctxcsn_lock );
 138                 }
 139                 break;
 140         case DB_NOTFOUND:
 141                 if ( op->o_tag == LDAP_REQ_ADD &&
 142                                                 be_issuffix( op->o_bd, &op->oq_add.rs_e->e_nname )) {
 143                         *suffix_ei = NULL;
 144                         eip = (EntryInfo *) ch_calloc( 1, sizeof( EntryInfo ));
 145                         eip->bei_id = op->oq_add.rs_e->e_id;
 146                 } else {
 147                         eip = *suffix_ei = ctxcsn_ei;
 148                 }
 149
 150                 /* This serializes add. But this case is very rare : only once. */
 151                 rs->sr_err = bdb_next_id( op->o_bd, tid, &ctxcsn_id );
 152                 if ( rs->sr_err != 0 ) {
 153 #ifdef NEW_LOGGING
 154                         LDAP_LOG ( OPERATION, ERR,
 155                                 "bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
 156 #else
 157                         Debug( LDAP_DEBUG_TRACE,
 158                                 "bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
 159 #endif
 160                         rs->sr_err = LDAP_OTHER;
 161                         rs->sr_text = "internal error";
 162                         return BDB_CSN_ABORT;
 163                 }
 164
 165                 *ctxcsn_e = slap_create_context_csn_entry( op->o_bd, &max_committed_csn );
 166                 op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
 167                 (*ctxcsn_e)->e_id = ctxcsn_id;
 168                 *ctxcsn_added = 1;
 169
 170                 ret = bdb_dn2id_add( op, tid, eip, *ctxcsn_e );
 171                 switch ( ret ) {
 172                 case 0 :
 173                         break;
 174                 case DB_LOCK_DEADLOCK :
 175                 case DB_LOCK_NOTGRANTED :
 176                         goto rewind;
 177                 case DB_KEYEXIST :
 178                         rs->sr_err = LDAP_OTHER;
 179                         rs->sr_text = "context csn exists before context prefix does";
 180                         return BDB_CSN_ABORT;
 181                 default :
 182                         rs->sr_err = LDAP_OTHER;
 183                         rs->sr_text = "context csn store failed";
 184                         return BDB_CSN_ABORT;
 185                 }
 186
 187                 if ( *suffix_ei == NULL ) {
 188                         ch_free( eip );
 189                 }
 190
 191                 ret = bdb_id2entry_add( op->o_bd, tid, *ctxcsn_e );
 192                 switch ( ret ) {
 193                 case 0 :
 194                         break;
 195                 case DB_LOCK_DEADLOCK :
 196                 case DB_LOCK_NOTGRANTED :
 197                         goto rewind;
 198                 default :
 199                         rs->sr_err = LDAP_OTHER;
 200                         rs->sr_text = "context csn store failed";
 201                         return BDB_CSN_ABORT;
 202                 }
 203                 ret = bdb_index_entry_add( op, tid, *ctxcsn_e );
 204                 switch ( ret ) {
 205                 case 0 :
 206                         break;
 207                 case DB_LOCK_DEADLOCK :
 208                 case DB_LOCK_NOTGRANTED :
 209                         goto rewind;
 210                 default :
 211                         rs->sr_err = LDAP_OTHER;
 212                         rs->sr_text = "context csn indexing failed";
 213                         return BDB_CSN_ABORT;
 214                 }
 215                 break;
 216         case DB_LOCK_DEADLOCK:
 217         case DB_LOCK_NOTGRANTED:
 218 #ifdef NEW_LOGGING
 219                 LDAP_LOG( OPERATION, ERR,
 220                                 "bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
 221 #else
 222                 Debug( LDAP_DEBUG_TRACE,
 223                                 "bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
 224 #endif
 225                 goto rewind;
 226         case LDAP_BUSY:
 227                 rs->sr_err = rc;
 228                 rs->sr_text = "ldap server busy";
 229                 return BDB_CSN_ABORT;
 230         default:
 231                 rs->sr_err = LDAP_OTHER;
 232                 rs->sr_text = "internal error";
 233                 return BDB_CSN_ABORT;
 234         }
 235
 236         return BDB_CSN_COMMIT;
 237
 238 rewind :
 239         slap_rewind_commit_csn( op );
 240         return BDB_CSN_RETRY;
 241 }
 242
 243 int
 244 bdb_get_commit_csn(
 245         Operation       *op,
 246         SlapReply       *rs,
 247         struct berval   **search_context_csn,
 248         u_int32_t       locker,
 249         DB_LOCK         *ctxcsn_lock
 250 )
 251 {
 252         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 253         struct berval csn = BER_BVNULL;
 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            gid[DB_XIDDATASIZE];
 260         char            csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
 261         int                     num_retries = 0;
 262         int                     ctxcsn_added = 0;
 263         int                     rc;
 264         struct sync_cookie syncCookie = { NULL, -1, NULL};
 265         syncinfo_t      *si;
 266         u_int32_t       ctxcsn_locker = 0;
 267
 268         if ( op->o_sync_mode != SLAP_SYNC_NONE &&
 269                  !LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 270                 char substr[67];
 271                 struct berval ctxcsn_ndn = BER_BVNULL;
 272                 struct berval bv;
 273
 274                 LDAP_STAILQ_FOREACH( si, &op->o_bd->be_syncinfo, si_next ) {
 275                         sprintf( substr, "cn=syncrepl%ld", si->si_rid );
 276                         ber_str2bv( substr, 0, 0, &bv );
 277                         build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0], &bv, op->o_tmpmemctx );
 278
 279 consumer_ctxcsn_retry :
 280                         rs->sr_err = bdb_dn2entry( op, NULL, &ctxcsn_ndn, &ctxcsn_ei,
 281                                                                                 0, locker, ctxcsn_lock );
 282                         switch(rs->sr_err) {
 283                         case DB_LOCK_DEADLOCK:
 284                         case DB_LOCK_NOTGRANTED:
 285                                 goto consumer_ctxcsn_retry;
 286                         case 0:
 287                                 op->o_tmpfree( ctxcsn_ndn.bv_val, op->o_tmpmemctx );
 288                                 ctxcsn_ndn.bv_val = NULL;
 289                                 if ( ctxcsn_ei ) {
 290                                         ctxcsn_e = ctxcsn_ei->bei_e;
 291                                 }
 292                                 break;
 293                         case DB_NOTFOUND:
 294                         default:
 295                                 rs->sr_err = LDAP_OTHER;
 296                         case LDAP_BUSY:
 297                                 op->o_tmpfree( ctxcsn_ndn.bv_val, op->o_tmpmemctx );
 298                                 ctxcsn_ndn.bv_val = NULL;
 299                                 goto done;
 300                         }
 301
 302                         if ( ctxcsn_e ) {
 303                                 csn_a = attr_find( ctxcsn_e->e_attrs,
 304                                                         slap_schema.si_ad_syncreplCookie );
 305                                 if ( csn_a ) {
 306                                         struct berval cookie;
 307                                         const char *text;
 308                                         int match = -1;
 309                                         ber_dupbv( &cookie, &csn_a->a_vals[0] );
 310                                         ber_bvarray_add( &syncCookie.octet_str, &cookie );
 311                                         slap_parse_sync_cookie( &syncCookie );
 312                                         if ( *search_context_csn &&
 313                                                 (*search_context_csn)->bv_val != NULL )
 314                                         {
 315                                                 value_match( &match, slap_schema.si_ad_entryCSN,
 316                                                         slap_schema.si_ad_entryCSN->ad_type->sat_ordering,
 317                                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
 318                                                         syncCookie.ctxcsn, *search_context_csn, &text );
 319                                         }
 320                                         if ( match < 0 ) {
 321                                                 /* set search_context_csn to the
 322                                                    smallest syncrepl cookie value */
 323                                                 if ( *search_context_csn ) {
 324                                                         ch_free( (*search_context_csn)->bv_val );
 325                                                         ch_free( *search_context_csn );
 326                                                 }
 327                                                 *search_context_csn = ber_dupbv( NULL,
 328                                                         syncCookie.ctxcsn );
 329                                         }
 330                                         slap_sync_cookie_free( &syncCookie, 0 );
 331                                 } else {
 332                                         *search_context_csn = NULL;
 333                                 }
 334                         } else {
 335                                 *search_context_csn = NULL;
 336                         }
 337                 }
 338         } else if ( op->o_sync_mode != SLAP_SYNC_NONE &&
 339                  LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 340
 341 provider_ctxcsn_retry :
 342                 rs->sr_err = bdb_dn2entry( op, NULL, &op->o_bd->be_context_csn, &ctxcsn_ei,
 343                                                                         0, locker, ctxcsn_lock );
 344                 switch(rs->sr_err) {
 345                 case 0:
 346                         if ( ctxcsn_ei ) {
 347                                 ctxcsn_e = ctxcsn_ei->bei_e;
 348                         }
 349                         break;
 350                 case LDAP_BUSY:
 351                         goto done;
 352                 case DB_LOCK_DEADLOCK:
 353                 case DB_LOCK_NOTGRANTED:
 354                         goto provider_ctxcsn_retry;
 355                 case DB_NOTFOUND:
 356                         snprintf( gid, sizeof( gid ), "%s-%08lx-%08lx",
 357                                 bdb_uuid.bv_val, (long) op->o_connid, (long) op->o_opid );
 358
 359                         slap_get_csn( op, csnbuf, sizeof(csnbuf), &csn, 1 );
 360
 361                         if ( 0 ) {
 362 txn_retry:
 363                                 rs->sr_err = TXN_ABORT( ltid );
 364                                 ltid = NULL;
 365                                 if ( rs->sr_err != 0 ) {
 366                                         rs->sr_err = LDAP_OTHER;
 367                                         goto done;
 368                                 }
 369                                 ldap_pvt_thread_yield();
 370                                 bdb_trans_backoff( ++num_retries );
 371                         }
 372                         rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, NULL,
 373                                                                 &ltid, bdb->bi_db_opflags );
 374                         if ( rs->sr_err != 0 ) {
 375                                 rs->sr_err = LDAP_OTHER;
 376                                 goto done;
 377                         }
 378
 379                         ctxcsn_locker = TXN_ID ( ltid );
 380
 381                         rs->sr_err = bdb_csn_commit( op, rs, ltid, NULL, &suffix_ei,
 382                                                                         &ctxcsn_e, &ctxcsn_added, ctxcsn_locker );
 383                         switch( rs->sr_err ) {
 384                         case BDB_CSN_ABORT:
 385                                 rs->sr_err = LDAP_OTHER;
 386                                 goto done;
 387                         case BDB_CSN_RETRY:
 388                                 goto txn_retry;
 389                         }
 390
 391                         rs->sr_err = TXN_PREPARE( ltid, gid );
 392                         if ( rs->sr_err != 0 ) {
 393                                 rs->sr_err = LDAP_OTHER;
 394                                 goto done;
 395                         }
 396
 397                         bdb_cache_add( bdb, suffix_ei, ctxcsn_e,
 398                                         (struct berval *)&slap_ldapsync_cn_bv, ctxcsn_locker );
 399
 400                         rs->sr_err = TXN_COMMIT( ltid, 0 );
 401                         if ( rs->sr_err != 0 ) {
 402                                 rs->sr_err = LDAP_OTHER;
 403                                 goto done;
 404                         }
 405
 406                         rs->sr_err = bdb_dn2entry( op, NULL, &op->o_bd->be_context_csn, &ctxcsn_ei,
 407                                     0, ctxcsn_locker, ctxcsn_lock );
 408
 409                         if ( ctxcsn_ei ) {
 410                                 ctxcsn_e = ctxcsn_ei->bei_e;
 411                         }
 412                         break;
 413
 414                 default:
 415                         rs->sr_err = LDAP_OTHER;
 416                         goto done;
 417                 }
 418
 419                 if ( ctxcsn_e ) {
 420                         csn_a = attr_find( ctxcsn_e->e_attrs,
 421                                                 slap_schema.si_ad_contextCSN );
 422                         if ( csn_a ) {
 423                                 *search_context_csn = ber_dupbv( NULL, &csn_a->a_vals[0] );
 424                         } else {
 425                                 *search_context_csn = NULL;
 426                         }
 427                 } else {
 428                         *search_context_csn = NULL;
 429                 }
 430         }
 431
 432         ltid = NULL;
 433         rs->sr_err = LDAP_SUCCESS;
 434
 435 done:
 436     if( ltid != NULL ) {
 437         TXN_ABORT( ltid );
 438     }
 439
 440         return rs->sr_err;
 441 }