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         case DB_NOTFOUND:
  64                 break;
  65         case DB_LOCK_DEADLOCK:
  66         case DB_LOCK_NOTGRANTED:
  67                 return BDB_CSN_RETRY;
  68         default:
  69                 return BDB_CSN_ABORT;
  70         }
  71
  72         *ctxcsn_e = ctxcsn_ei->bei_e;
  73
  74         slap_get_commit_csn( op, &max_committed_csn );
  75
  76         if ( max_committed_csn.bv_val == NULL ) {
  77                 return BDB_CSN_COMMIT;
  78         }
  79
  80         *ctxcsn_added = 0;
  81
  82         switch( rc ) {
  83         case 0:
  84                 if ( !*ctxcsn_e ) {
  85                         rs->sr_err = LDAP_OTHER;
  86                         rs->sr_text = "context csn not present";
  87                         op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
  88                         return BDB_CSN_ABORT;
  89                 } else {
  90                         Modifications mod;
  91                         struct berval modvals[2];
  92                         Entry dummy;
  93
  94                         modvals[0] = max_committed_csn;
  95                         modvals[1].bv_val = NULL;
  96                         modvals[1].bv_len = 0;
  97
  98                         mod.sml_op = LDAP_MOD_REPLACE;
  99                         mod.sml_values = modvals;
 100                         mod.sml_nvalues = NULL;
 101                         mod.sml_desc = slap_schema.si_ad_contextCSN;
 102                         mod.sml_type = mod.sml_desc->ad_cname;
 103                         mod.sml_next = NULL;
 104
 105                         dummy = **ctxcsn_e;
 106                         ret = bdb_modify_internal( op, tid, &mod, &dummy,
 107                                                                         &rs->sr_text, textbuf, textlen );
 108                         op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
 109                         if ( ret != LDAP_SUCCESS ) {
 110 #ifdef NEW_LOGGING
 111                                 LDAP_LOG ( OPERATION, ERR,
 112                                                 "bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
 113 #else
 114                                 Debug( LDAP_DEBUG_TRACE,
 115                                                 "bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
 116 #endif
 117                                 switch( ret ) {
 118                                 case DB_LOCK_DEADLOCK:
 119                                 case DB_LOCK_NOTGRANTED:
 120                                         goto rewind;
 121                                 default:
 122                                         return BDB_CSN_ABORT;
 123                                 }
 124                         }
 125
 126                         ret = bdb_id2entry_update( op->o_bd, tid, &dummy );
 127                         switch ( ret ) {
 128                         case 0 :
 129                                 break;
 130                         case DB_LOCK_DEADLOCK :
 131                         case DB_LOCK_NOTGRANTED :
 132                                 goto rewind;
 133                         default :
 134                                 rs->sr_err = ret;
 135                                 rs->sr_text = "context csn update failed";
 136                                 return BDB_CSN_ABORT;
 137                         }
 138                         bdb_cache_modify( *ctxcsn_e, dummy.e_attrs, bdb->bi_dbenv, locker, &ctxcsn_lock );
 139                 }
 140                 break;
 141         case DB_NOTFOUND:
 142                 if ( op->o_tag == LDAP_REQ_ADD &&
 143                                                 be_issuffix( op->o_bd, &op->oq_add.rs_e->e_nname )) {
 144                         *suffix_ei = NULL;
 145                         eip = (EntryInfo *) ch_calloc( 1, sizeof( EntryInfo ));
 146                         eip->bei_id = op->oq_add.rs_e->e_id;
 147                 } else {
 148                         eip = *suffix_ei = ctxcsn_ei;
 149                 }
 150
 151                 /* This serializes add. But this case is very rare : only once. */
 152                 rs->sr_err = bdb_next_id( op->o_bd, tid, &ctxcsn_id );
 153                 if ( rs->sr_err != 0 ) {
 154 #ifdef NEW_LOGGING
 155                         LDAP_LOG ( OPERATION, ERR,
 156                                 "bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
 157 #else
 158                         Debug( LDAP_DEBUG_TRACE,
 159                                 "bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
 160 #endif
 161                         rs->sr_err = LDAP_OTHER;
 162                         rs->sr_text = "internal error";
 163                         return BDB_CSN_ABORT;
 164                 }
 165
 166                 *ctxcsn_e = slap_create_context_csn_entry( op->o_bd, &max_committed_csn );
 167                 op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
 168                 (*ctxcsn_e)->e_id = ctxcsn_id;
 169                 *ctxcsn_added = 1;
 170
 171                 ret = bdb_dn2id_add( op, tid, eip, *ctxcsn_e );
 172                 switch ( ret ) {
 173                 case 0 :
 174                         break;
 175                 case DB_LOCK_DEADLOCK :
 176                 case DB_LOCK_NOTGRANTED :
 177                         goto rewind;
 178                 case DB_KEYEXIST :
 179                         rs->sr_err = LDAP_OTHER;
 180                         rs->sr_text = "context csn exists before context prefix does";
 181                         return BDB_CSN_ABORT;
 182                 default :
 183                         rs->sr_err = LDAP_OTHER;
 184                         rs->sr_text = "context csn store failed";
 185                         return BDB_CSN_ABORT;
 186                 }
 187
 188                 if ( *suffix_ei == NULL ) {
 189                         ch_free( eip );
 190                 }
 191
 192                 ret = bdb_id2entry_add( op->o_bd, tid, *ctxcsn_e );
 193                 switch ( ret ) {
 194                 case 0 :
 195                         break;
 196                 case DB_LOCK_DEADLOCK :
 197                 case DB_LOCK_NOTGRANTED :
 198                         goto rewind;
 199                 default :
 200                         rs->sr_err = LDAP_OTHER;
 201                         rs->sr_text = "context csn store failed";
 202                         return BDB_CSN_ABORT;
 203                 }
 204                 ret = bdb_index_entry_add( op, tid, *ctxcsn_e );
 205                 switch ( ret ) {
 206                 case 0 :
 207                         break;
 208                 case DB_LOCK_DEADLOCK :
 209                 case DB_LOCK_NOTGRANTED :
 210                         goto rewind;
 211                 default :
 212                         rs->sr_err = LDAP_OTHER;
 213                         rs->sr_text = "context csn indexing failed";
 214                         return BDB_CSN_ABORT;
 215                 }
 216                 break;
 217         case DB_LOCK_DEADLOCK:
 218         case DB_LOCK_NOTGRANTED:
 219 #ifdef NEW_LOGGING
 220                 LDAP_LOG( OPERATION, ERR,
 221                                 "bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
 222 #else
 223                 Debug( LDAP_DEBUG_TRACE,
 224                                 "bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
 225 #endif
 226                 goto rewind;
 227         case LDAP_BUSY:
 228                 rs->sr_err = rc;
 229                 rs->sr_text = "ldap server busy";
 230                 return BDB_CSN_ABORT;
 231         default:
 232                 rs->sr_err = LDAP_OTHER;
 233                 rs->sr_text = "internal error";
 234                 return BDB_CSN_ABORT;
 235         }
 236
 237         return BDB_CSN_COMMIT;
 238
 239 rewind :
 240         slap_rewind_commit_csn( op );
 241         return BDB_CSN_RETRY;
 242 }
 243
 244 int
 245 bdb_get_commit_csn(
 246         Operation       *op,
 247         SlapReply       *rs,
 248         struct berval   **search_context_csn,
 249         u_int32_t       locker,
 250         DB_LOCK         *ctxcsn_lock
 251 )
 252 {
 253         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 254         struct berval csn = BER_BVNULL;
 255         EntryInfo       *ctxcsn_ei = NULL;
 256         EntryInfo       *suffix_ei = NULL;
 257         Entry           *ctxcsn_e = NULL;
 258         DB_TXN          *ltid = NULL;
 259         Attribute       *csn_a;
 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         struct sync_cookie syncCookie = { NULL, -1, NULL};
 266         syncinfo_t      *si;
 267         u_int32_t       ctxcsn_locker = 0;
 268
 269         if ( op->o_sync_mode != SLAP_SYNC_NONE &&
 270                  !LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 271                 char substr[67];
 272                 struct berval ctxcsn_ndn = BER_BVNULL;
 273                 struct berval bv;
 274
 275                 LDAP_STAILQ_FOREACH( si, &op->o_bd->be_syncinfo, si_next ) {
 276                         sprintf( substr, "cn=syncrepl%ld", si->si_rid );
 277                         ber_str2bv( substr, 0, 0, &bv );
 278                         build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0], &bv, op->o_tmpmemctx );
 279
 280 consumer_ctxcsn_retry :
 281                         rs->sr_err = bdb_dn2entry( op, NULL, &ctxcsn_ndn, &ctxcsn_ei,
 282                                                                                 0, locker, ctxcsn_lock );
 283                         switch(rs->sr_err) {
 284                         case DB_LOCK_DEADLOCK:
 285                         case DB_LOCK_NOTGRANTED:
 286                                 goto consumer_ctxcsn_retry;
 287                         case 0:
 288                                 op->o_tmpfree( ctxcsn_ndn.bv_val, op->o_tmpmemctx );
 289                                 ctxcsn_ndn.bv_val = NULL;
 290                                 if ( ctxcsn_ei ) {
 291                                         ctxcsn_e = ctxcsn_ei->bei_e;
 292                                 }
 293                                 break;
 294                         case DB_NOTFOUND:
 295                         default:
 296                                 rs->sr_err = LDAP_OTHER;
 297                         case LDAP_BUSY:
 298                                 op->o_tmpfree( ctxcsn_ndn.bv_val, op->o_tmpmemctx );
 299                                 ctxcsn_ndn.bv_val = NULL;
 300                                 goto done;
 301                         }
 302
 303                         if ( ctxcsn_e ) {
 304                                 csn_a = attr_find( ctxcsn_e->e_attrs,
 305                                                         slap_schema.si_ad_syncreplCookie );
 306                                 if ( csn_a ) {
 307                                         struct berval cookie;
 308                                         const char *text;
 309                                         int match = -1;
 310                                         ber_dupbv( &cookie, &csn_a->a_vals[0] );
 311                                         ber_bvarray_add( &syncCookie.octet_str, &cookie );
 312                                         slap_parse_sync_cookie( &syncCookie );
 313                                         if ( *search_context_csn &&
 314                                                 (*search_context_csn)->bv_val != NULL )
 315                                         {
 316                                                 value_match( &match, slap_schema.si_ad_entryCSN,
 317                                                         slap_schema.si_ad_entryCSN->ad_type->sat_ordering,
 318                                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
 319                                                         syncCookie.ctxcsn, *search_context_csn, &text );
 320                                         }
 321                                         if ( match < 0 ) {
 322                                                 /* set search_context_csn to the
 323                                                    smallest syncrepl cookie value */
 324                                                 if ( *search_context_csn ) {
 325                                                         ch_free( (*search_context_csn)->bv_val );
 326                                                         ch_free( *search_context_csn );
 327                                                 }
 328                                                 *search_context_csn = ber_dupbv( NULL,
 329                                                         syncCookie.ctxcsn );
 330                                         }
 331                                         slap_sync_cookie_free( &syncCookie, 0 );
 332                                 } else {
 333                                         *search_context_csn = NULL;
 334                                 }
 335                         } else {
 336                                 *search_context_csn = NULL;
 337                         }
 338                 }
 339         } else if ( op->o_sync_mode != SLAP_SYNC_NONE &&
 340                  LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 341
 342 provider_ctxcsn_retry :
 343                 rs->sr_err = bdb_dn2entry( op, NULL, &op->o_bd->be_context_csn, &ctxcsn_ei,
 344                                                                         0, locker, ctxcsn_lock );
 345                 switch(rs->sr_err) {
 346                 case 0:
 347                         if ( ctxcsn_ei ) {
 348                                 ctxcsn_e = ctxcsn_ei->bei_e;
 349                         }
 350                         break;
 351                 case LDAP_BUSY:
 352                         goto done;
 353                 case DB_LOCK_DEADLOCK:
 354                 case DB_LOCK_NOTGRANTED:
 355                         goto provider_ctxcsn_retry;
 356                 case DB_NOTFOUND:
 357                         snprintf( gid, sizeof( gid ), "%s-%08lx-%08lx",
 358                                 bdb_uuid.bv_val, (long) op->o_connid, (long) op->o_opid );
 359
 360                         slap_get_csn( op, csnbuf, sizeof(csnbuf), &csn, 1 );
 361
 362                         if ( 0 ) {
 363 txn_retry:
 364                                 rs->sr_err = TXN_ABORT( ltid );
 365                                 ltid = NULL;
 366                                 if ( rs->sr_err != 0 ) {
 367                                         rs->sr_err = LDAP_OTHER;
 368                                         goto done;
 369                                 }
 370                                 ldap_pvt_thread_yield();
 371                                 bdb_trans_backoff( ++num_retries );
 372                         }
 373                         rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, NULL,
 374                                                                 &ltid, bdb->bi_db_opflags );
 375                         if ( rs->sr_err != 0 ) {
 376                                 rs->sr_err = LDAP_OTHER;
 377                                 goto done;
 378                         }
 379
 380                         ctxcsn_locker = TXN_ID ( ltid );
 381
 382                         rs->sr_err = bdb_csn_commit( op, rs, ltid, NULL, &suffix_ei,
 383                                                                         &ctxcsn_e, &ctxcsn_added, ctxcsn_locker );
 384                         switch( rs->sr_err ) {
 385                         case BDB_CSN_ABORT:
 386                                 rs->sr_err = LDAP_OTHER;
 387                                 goto done;
 388                         case BDB_CSN_RETRY:
 389                                 goto txn_retry;
 390                         }
 391
 392                         rs->sr_err = TXN_PREPARE( ltid, gid );
 393                         if ( rs->sr_err != 0 ) {
 394                                 rs->sr_err = LDAP_OTHER;
 395                                 goto done;
 396                         }
 397
 398                         bdb_cache_add( bdb, suffix_ei, ctxcsn_e,
 399                                         (struct berval *)&slap_ldapsync_cn_bv, ctxcsn_locker );
 400
 401                         rs->sr_err = TXN_COMMIT( ltid, 0 );
 402                         if ( rs->sr_err != 0 ) {
 403                                 rs->sr_err = LDAP_OTHER;
 404                                 goto done;
 405                         }
 406
 407                         rs->sr_err = bdb_dn2entry( op, NULL, &op->o_bd->be_context_csn, &ctxcsn_ei,
 408                                     0, ctxcsn_locker, ctxcsn_lock );
 409
 410                         if ( ctxcsn_ei ) {
 411                                 ctxcsn_e = ctxcsn_ei->bei_e;
 412                         }
 413                         break;
 414
 415                 default:
 416                         rs->sr_err = LDAP_OTHER;
 417                         goto done;
 418                 }
 419
 420                 if ( ctxcsn_e ) {
 421                         csn_a = attr_find( ctxcsn_e->e_attrs,
 422                                                 slap_schema.si_ad_contextCSN );
 423                         if ( csn_a ) {
 424                                 *search_context_csn = ber_dupbv( NULL, &csn_a->a_vals[0] );
 425                         } else {
 426                                 *search_context_csn = NULL;
 427                         }
 428                 } else {
 429                         *search_context_csn = NULL;
 430                 }
 431         }
 432
 433         ltid = NULL;
 434         rs->sr_err = LDAP_SUCCESS;
 435
 436 done:
 437     if( ltid != NULL ) {
 438         TXN_ABORT( ltid );
 439     }
 440
 441         return rs->sr_err;
 442 }