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                                 Debug( LDAP_DEBUG_TRACE,
 111                                                 "bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
 112                                 if ( dummy.e_attrs != e->e_attrs ) attrs_free( dummy.e_attrs );
 113                                 switch( ret ) {
 114                                 case DB_LOCK_DEADLOCK:
 115                                 case DB_LOCK_NOTGRANTED:
 116                                         goto rewind;
 117                                 default:
 118                                         return BDB_CSN_ABORT;
 119                                 }
 120                         }
 121
 122                         ret = bdb_id2entry_update( op->o_bd, tid, &dummy );
 123                         switch ( ret ) {
 124                         case 0 :
 125                                 break;
 126                         case DB_LOCK_DEADLOCK :
 127                         case DB_LOCK_NOTGRANTED :
 128                                 if ( dummy.e_attrs != e->e_attrs ) attrs_free( dummy.e_attrs );
 129                                 goto rewind;
 130                         default :
 131                                 if ( dummy.e_attrs != e->e_attrs ) attrs_free( dummy.e_attrs );
 132                                 rs->sr_err = ret;
 133                                 rs->sr_text = "context csn update failed";
 134                                 return BDB_CSN_ABORT;
 135                         }
 136                         ret = bdb_cache_modify( *ctxcsn_e, dummy.e_attrs, bdb->bi_dbenv, locker, &ctxcsn_lock );
 137                         if ( ret != LDAP_SUCCESS ) {
 138                                 if ( dummy.e_attrs != e->e_attrs ) attrs_free( dummy.e_attrs );
 139                                 switch( ret ) {
 140                                 case DB_LOCK_DEADLOCK:
 141                                 case DB_LOCK_NOTGRANTED:
 142                                         goto rewind;
 143                                 }
 144                         }
 145                 }
 146                 break;
 147         case DB_NOTFOUND:
 148                 if ( op->o_tag == LDAP_REQ_ADD &&
 149                                                 be_issuffix( op->o_bd, &op->oq_add.rs_e->e_nname )) {
 150                         *suffix_ei = NULL;
 151                         eip = (EntryInfo *) ch_calloc( 1, sizeof( EntryInfo ));
 152                         eip->bei_id = op->oq_add.rs_e->e_id;
 153                 } else {
 154                         eip = *suffix_ei = ctxcsn_ei;
 155                 }
 156
 157                 /* This serializes add. But this case is very rare : only once. */
 158                 rs->sr_err = bdb_next_id( op->o_bd, tid, &ctxcsn_id );
 159                 if ( rs->sr_err != 0 ) {
 160                         Debug( LDAP_DEBUG_TRACE,
 161                                 "bdb_csn_commit: next_id failed (%d)\n",
 162                                 rs->sr_err, 0, 0 );
 163                         rs->sr_err = LDAP_OTHER;
 164                         rs->sr_text = "internal error";
 165                         return BDB_CSN_ABORT;
 166                 }
 167
 168                 *ctxcsn_e = slap_create_context_csn_entry( op->o_bd, &max_committed_csn );
 169                 op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
 170                 (*ctxcsn_e)->e_id = ctxcsn_id;
 171                 *ctxcsn_added = 1;
 172
 173                 ret = bdb_dn2id_add( op, tid, eip, *ctxcsn_e );
 174                 switch ( ret ) {
 175                 case 0 :
 176                         break;
 177                 case DB_LOCK_DEADLOCK :
 178                 case DB_LOCK_NOTGRANTED :
 179                         goto rewind;
 180                 case DB_KEYEXIST :
 181                         rs->sr_err = LDAP_OTHER;
 182                         rs->sr_text = "context csn exists before context prefix does";
 183                         return BDB_CSN_ABORT;
 184                 default :
 185                         rs->sr_err = LDAP_OTHER;
 186                         rs->sr_text = "context csn store failed";
 187                         return BDB_CSN_ABORT;
 188                 }
 189
 190                 if ( *suffix_ei == NULL ) {
 191                         ch_free( eip );
 192                 }
 193
 194                 ret = bdb_id2entry_add( op->o_bd, tid, *ctxcsn_e );
 195                 switch ( ret ) {
 196                 case 0 :
 197                         break;
 198                 case DB_LOCK_DEADLOCK :
 199                 case DB_LOCK_NOTGRANTED :
 200                         goto rewind;
 201                 default :
 202                         rs->sr_err = LDAP_OTHER;
 203                         rs->sr_text = "context csn store failed";
 204                         return BDB_CSN_ABORT;
 205                 }
 206                 ret = bdb_index_entry_add( op, tid, *ctxcsn_e );
 207                 switch ( ret ) {
 208                 case 0 :
 209                         break;
 210                 case DB_LOCK_DEADLOCK :
 211                 case DB_LOCK_NOTGRANTED :
 212                         goto rewind;
 213                 default :
 214                         rs->sr_err = LDAP_OTHER;
 215                         rs->sr_text = "context csn indexing failed";
 216                         return BDB_CSN_ABORT;
 217                 }
 218                 break;
 219         case DB_LOCK_DEADLOCK:
 220         case DB_LOCK_NOTGRANTED:
 221                 Debug( LDAP_DEBUG_TRACE,
 222                                 "bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
 223                 goto rewind;
 224         case LDAP_BUSY:
 225                 rs->sr_err = rc;
 226                 rs->sr_text = "ldap server busy";
 227                 return BDB_CSN_ABORT;
 228         default:
 229                 rs->sr_err = LDAP_OTHER;
 230                 rs->sr_text = "internal error";
 231                 return BDB_CSN_ABORT;
 232         }
 233
 234         return BDB_CSN_COMMIT;
 235
 236 rewind :
 237         slap_rewind_commit_csn( op );
 238         return BDB_CSN_RETRY;
 239 }
 240
 241 int
 242 bdb_get_commit_csn(
 243         Operation       *op,
 244         SlapReply       *rs,
 245         struct berval   **search_context_csn,
 246         u_int32_t       locker,
 247         DB_LOCK         *ctxcsn_lock
 248 )
 249 {
 250         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 251         struct berval csn = BER_BVNULL;
 252         EntryInfo       *ctxcsn_ei = NULL;
 253         EntryInfo       *suffix_ei = NULL;
 254         Entry           *ctxcsn_e = NULL;
 255         DB_TXN          *ltid = NULL;
 256         Attribute       *csn_a;
 257         char            gid[DB_XIDDATASIZE];
 258         char            csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
 259         int                     num_retries = 0;
 260         int                     ctxcsn_added = 0;
 261         int                     rc;
 262         struct sync_cookie syncCookie = { NULL, -1, NULL};
 263         syncinfo_t      *si;
 264         u_int32_t       ctxcsn_locker = 0;
 265
 266         if ( op->o_sync_mode != SLAP_SYNC_NONE &&
 267                  !LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 268                 char substr[67];
 269                 struct berval ctxcsn_ndn = BER_BVNULL;
 270                 struct berval bv;
 271
 272                 LDAP_STAILQ_FOREACH( si, &op->o_bd->be_syncinfo, si_next ) {
 273                         sprintf( substr, "cn=syncrepl%ld", si->si_rid );
 274                         ber_str2bv( substr, 0, 0, &bv );
 275                         build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0], &bv, op->o_tmpmemctx );
 276
 277 consumer_ctxcsn_retry :
 278                         rs->sr_err = bdb_dn2entry( op, NULL, &ctxcsn_ndn, &ctxcsn_ei,
 279                                                                                 0, locker, ctxcsn_lock );
 280                         switch(rs->sr_err) {
 281                         case DB_LOCK_DEADLOCK:
 282                         case DB_LOCK_NOTGRANTED:
 283                                 goto consumer_ctxcsn_retry;
 284                         case 0:
 285                                 op->o_tmpfree( ctxcsn_ndn.bv_val, op->o_tmpmemctx );
 286                                 ctxcsn_ndn.bv_val = NULL;
 287                                 if ( ctxcsn_ei ) {
 288                                         ctxcsn_e = ctxcsn_ei->bei_e;
 289                                 }
 290                                 break;
 291                         case DB_NOTFOUND:
 292                         default:
 293                                 rs->sr_err = LDAP_OTHER;
 294                         case LDAP_BUSY:
 295                                 op->o_tmpfree( ctxcsn_ndn.bv_val, op->o_tmpmemctx );
 296                                 ctxcsn_ndn.bv_val = NULL;
 297                                 goto done;
 298                         }
 299
 300                         if ( ctxcsn_e ) {
 301                                 csn_a = attr_find( ctxcsn_e->e_attrs,
 302                                                         slap_schema.si_ad_syncreplCookie );
 303                                 if ( csn_a ) {
 304                                         struct berval cookie;
 305                                         const char *text;
 306                                         int match = -1;
 307                                         ber_dupbv( &cookie, &csn_a->a_vals[0] );
 308                                         ber_bvarray_add( &syncCookie.octet_str, &cookie );
 309                                         slap_parse_sync_cookie( &syncCookie );
 310                                         if ( *search_context_csn &&
 311                                                 (*search_context_csn)->bv_val != NULL )
 312                                         {
 313                                                 value_match( &match, slap_schema.si_ad_entryCSN,
 314                                                         slap_schema.si_ad_entryCSN->ad_type->sat_ordering,
 315                                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
 316                                                         syncCookie.ctxcsn, *search_context_csn, &text );
 317                                         }
 318                                         if ( match < 0 ) {
 319                                                 /* set search_context_csn to the
 320                                                    smallest syncrepl cookie value */
 321                                                 if ( *search_context_csn ) {
 322                                                         ch_free( (*search_context_csn)->bv_val );
 323                                                         ch_free( *search_context_csn );
 324                                                 }
 325                                                 *search_context_csn = ber_dupbv( NULL,
 326                                                         syncCookie.ctxcsn );
 327                                         }
 328                                         slap_sync_cookie_free( &syncCookie, 0 );
 329                                 } else {
 330                                         *search_context_csn = NULL;
 331                                 }
 332                         } else {
 333                                 *search_context_csn = NULL;
 334                         }
 335                 }
 336         } else if ( op->o_sync_mode != SLAP_SYNC_NONE &&
 337                  LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 338
 339 provider_ctxcsn_retry :
 340                 rs->sr_err = bdb_dn2entry( op, NULL, &op->o_bd->be_context_csn, &ctxcsn_ei,
 341                                                                         0, locker, ctxcsn_lock );
 342                 switch(rs->sr_err) {
 343                 case 0:
 344                         if ( ctxcsn_ei ) {
 345                                 ctxcsn_e = ctxcsn_ei->bei_e;
 346                         }
 347                         break;
 348                 case LDAP_BUSY:
 349                         goto done;
 350                 case DB_LOCK_DEADLOCK:
 351                 case DB_LOCK_NOTGRANTED:
 352                         goto provider_ctxcsn_retry;
 353                 case DB_NOTFOUND:
 354                         snprintf( gid, sizeof( gid ), "%s-%08lx-%08lx",
 355                                 bdb_uuid.bv_val, (long) op->o_connid, (long) op->o_opid );
 356
 357                         slap_get_csn( op, csnbuf, sizeof(csnbuf), &csn, 1 );
 358
 359                         if ( 0 ) {
 360 txn_retry:
 361                                 rs->sr_err = TXN_ABORT( ltid );
 362                                 ltid = NULL;
 363                                 if ( rs->sr_err != 0 ) {
 364                                         rs->sr_err = LDAP_OTHER;
 365                                         goto done;
 366                                 }
 367                                 ldap_pvt_thread_yield();
 368                                 bdb_trans_backoff( ++num_retries );
 369                         }
 370                         rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, NULL,
 371                                                                 &ltid, bdb->bi_db_opflags );
 372                         if ( rs->sr_err != 0 ) {
 373                                 rs->sr_err = LDAP_OTHER;
 374                                 goto done;
 375                         }
 376
 377                         ctxcsn_locker = TXN_ID ( ltid );
 378
 379                         rs->sr_err = bdb_csn_commit( op, rs, ltid, NULL, &suffix_ei,
 380                                                                         &ctxcsn_e, &ctxcsn_added, ctxcsn_locker );
 381                         switch( rs->sr_err ) {
 382                         case BDB_CSN_ABORT:
 383                                 rs->sr_err = LDAP_OTHER;
 384                                 goto done;
 385                         case BDB_CSN_RETRY:
 386                                 goto txn_retry;
 387                         }
 388
 389                         rs->sr_err = TXN_PREPARE( ltid, gid );
 390                         if ( rs->sr_err != 0 ) {
 391                                 rs->sr_err = LDAP_OTHER;
 392                                 goto done;
 393                         }
 394
 395                         bdb_cache_add( bdb, suffix_ei, ctxcsn_e,
 396                                         (struct berval *)&slap_ldapsync_cn_bv, ctxcsn_locker );
 397
 398                         rs->sr_err = TXN_COMMIT( ltid, 0 );
 399                         if ( rs->sr_err != 0 ) {
 400                                 rs->sr_err = LDAP_OTHER;
 401                                 goto done;
 402                         }
 403
 404                         rs->sr_err = bdb_dn2entry( op, NULL, &op->o_bd->be_context_csn, &ctxcsn_ei,
 405                                     0, ctxcsn_locker, ctxcsn_lock );
 406
 407                         if ( ctxcsn_ei ) {
 408                                 ctxcsn_e = ctxcsn_ei->bei_e;
 409                         }
 410                         break;
 411
 412                 default:
 413                         rs->sr_err = LDAP_OTHER;
 414                         goto done;
 415                 }
 416
 417                 if ( ctxcsn_e ) {
 418                         csn_a = attr_find( ctxcsn_e->e_attrs,
 419                                                 slap_schema.si_ad_contextCSN );
 420                         if ( csn_a ) {
 421                                 *search_context_csn = ber_dupbv( NULL, &csn_a->a_vals[0] );
 422                         } else {
 423                                 *search_context_csn = NULL;
 424                         }
 425                 } else {
 426                         *search_context_csn = NULL;
 427                 }
 428         }
 429
 430         ltid = NULL;
 431         rs->sr_err = LDAP_SUCCESS;
 432
 433 done:
 434     if( ltid != NULL ) {
 435         TXN_ABORT( ltid );
 436     }
 437
 438         return rs->sr_err;
 439 }