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