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         if ( ei ) {
  54                 e = ei->bei_e;
  55         }
  56
  57         rc =  bdb_dn2entry( op, tid, &op->o_bd->be_context_csn, &ctxcsn_ei,
  58                         1, locker, &ctxcsn_lock );
  59
  60         *ctxcsn_e = ctxcsn_ei->bei_e;
  61
  62         slap_get_commit_csn( op, &max_committed_csn );
  63
  64         if ( max_committed_csn.bv_val == NULL ) {
  65                 return BDB_CSN_COMMIT;
  66         }
  67
  68         *ctxcsn_added = 0;
  69
  70         switch( rc ) {
  71         case 0:
  72                 if ( !*ctxcsn_e ) {
  73                         rs->sr_err = LDAP_OTHER;
  74                         rs->sr_text = "context csn not present";
  75                         op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
  76                         return BDB_CSN_ABORT;
  77                 } else {
  78                         Modifications mod;
  79                         struct berval modvals[2];
  80                         Entry dummy;
  81
  82                         modvals[0] = max_committed_csn;
  83                         modvals[1].bv_val = NULL;
  84                         modvals[1].bv_len = 0;
  85
  86                         mod.sml_op = LDAP_MOD_REPLACE;
  87                         mod.sml_values = modvals;
  88                         mod.sml_nvalues = NULL;
  89                         mod.sml_desc = slap_schema.si_ad_contextCSN;
  90                         mod.sml_type = mod.sml_desc->ad_cname;
  91                         mod.sml_next = NULL;
  92
  93                         dummy = **ctxcsn_e;
  94                         ret = bdb_modify_internal( op, tid, &mod, &dummy,
  95                                                                         &rs->sr_text, textbuf, textlen );
  96                         op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
  97                         if ( ret != LDAP_SUCCESS ) {
  98 #ifdef NEW_LOGGING
  99                                 LDAP_LOG ( OPERATION, ERR,
 100                                                 "bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
 101 #else
 102                                 Debug( LDAP_DEBUG_TRACE,
 103                                                 "bdb_csn_commit: modify failed (%d)\n", rs->sr_err, 0, 0 );
 104 #endif
 105                                 switch( ret ) {
 106                                 case DB_LOCK_DEADLOCK:
 107                                 case DB_LOCK_NOTGRANTED:
 108                                         goto rewind;
 109                                 default:
 110                                         return BDB_CSN_ABORT;
 111                                 }
 112                         }
 113
 114                         ret = bdb_id2entry_update( op->o_bd, tid, &dummy );
 115                         switch ( ret ) {
 116                         case 0 :
 117                                 break;
 118                         case DB_LOCK_DEADLOCK :
 119                         case DB_LOCK_NOTGRANTED :
 120                                 goto rewind;
 121                         default :
 122                                 rs->sr_err = ret;
 123                                 rs->sr_text = "context csn update failed";
 124                                 return BDB_CSN_ABORT;
 125                         }
 126                         bdb_cache_modify( *ctxcsn_e, dummy.e_attrs, bdb->bi_dbenv, locker, &ctxcsn_lock );
 127                 }
 128                 break;
 129         case DB_NOTFOUND:
 130                 if ( op->o_tag == LDAP_REQ_ADD &&
 131                                                 be_issuffix( op->o_bd, &op->oq_add.rs_e->e_nname )) {
 132                         *suffix_ei = NULL;
 133                         eip = (EntryInfo *) ch_calloc( 1, sizeof( EntryInfo ));
 134                         eip->bei_id = op->oq_add.rs_e->e_id;
 135                 } else {
 136                         eip = *suffix_ei = ctxcsn_ei;
 137                 }
 138
 139                 /* This serializes add. But this case is very rare : only once. */
 140                 rs->sr_err = bdb_next_id( op->o_bd, tid, &ctxcsn_id );
 141                 if ( rs->sr_err != 0 ) {
 142 #ifdef NEW_LOGGING
 143                         LDAP_LOG ( OPERATION, ERR,
 144                                 "bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
 145 #else
 146                         Debug( LDAP_DEBUG_TRACE,
 147                                 "bdb_add: next_id failed (%d)\n", rs->sr_err, 0, 0 );
 148 #endif
 149                         rs->sr_err = LDAP_OTHER;
 150                         rs->sr_text = "internal error";
 151                         return BDB_CSN_ABORT;
 152                 }
 153
 154                 *ctxcsn_e = slap_create_context_csn_entry( op->o_bd, &max_committed_csn );
 155                 op->o_tmpfree( max_committed_csn.bv_val, op->o_tmpmemctx );
 156                 (*ctxcsn_e)->e_id = ctxcsn_id;
 157                 *ctxcsn_added = 1;
 158
 159                 ret = bdb_dn2id_add( op, tid, eip, *ctxcsn_e );
 160                 switch ( ret ) {
 161                 case 0 :
 162                         break;
 163                 case DB_LOCK_DEADLOCK :
 164                 case DB_LOCK_NOTGRANTED :
 165                         goto rewind;
 166                 case DB_KEYEXIST :
 167                         rs->sr_err = LDAP_OTHER;
 168                         rs->sr_text = "context csn exists before context prefix does";
 169                         return BDB_CSN_ABORT;
 170                 default :
 171                         rs->sr_err = LDAP_OTHER;
 172                         rs->sr_text = "context csn store failed";
 173                         return BDB_CSN_ABORT;
 174                 }
 175
 176                 if ( *suffix_ei == NULL ) {
 177                         ch_free( eip );
 178                 }
 179
 180                 ret = bdb_id2entry_add( op->o_bd, tid, *ctxcsn_e );
 181                 switch ( ret ) {
 182                 case 0 :
 183                         break;
 184                 case DB_LOCK_DEADLOCK :
 185                 case DB_LOCK_NOTGRANTED :
 186                         goto rewind;
 187                 default :
 188                         rs->sr_err = LDAP_OTHER;
 189                         rs->sr_text = "context csn store failed";
 190                         return BDB_CSN_ABORT;
 191                 }
 192                 ret = bdb_index_entry_add( op, 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 indexing failed";
 202                         return BDB_CSN_ABORT;
 203                 }
 204                 break;
 205         case DB_LOCK_DEADLOCK:
 206         case DB_LOCK_NOTGRANTED:
 207 #ifdef NEW_LOGGING
 208                 LDAP_LOG( OPERATION, ERR,
 209                                 "bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
 210 #else
 211                 Debug( LDAP_DEBUG_TRACE,
 212                                 "bdb_csn_commit : bdb_dn2entry retry\n", 0, 0, 0 );
 213 #endif
 214                 goto rewind;
 215         case LDAP_BUSY:
 216                 rs->sr_err = rc;
 217                 rs->sr_text = "ldap server busy";
 218                 return BDB_CSN_ABORT;
 219         default:
 220                 rs->sr_err = LDAP_OTHER;
 221                 rs->sr_text = "internal error";
 222                 return BDB_CSN_ABORT;
 223         }
 224
 225         return BDB_CSN_COMMIT;
 226
 227 rewind :
 228         slap_rewind_commit_csn( op );
 229         return BDB_CSN_RETRY;
 230 }
 231
 232 int
 233 bdb_get_commit_csn(
 234         Operation       *op,
 235         SlapReply       *rs,
 236         struct berval   **search_context_csn,
 237         u_int32_t       locker,
 238         DB_LOCK         *ctxcsn_lock
 239 )
 240 {
 241         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
 242         struct berval csn = BER_BVNULL;
 243         EntryInfo       *ctxcsn_ei = NULL;
 244         EntryInfo       *suffix_ei = NULL;
 245         Entry           *ctxcsn_e = NULL;
 246         DB_TXN          *ltid = NULL;
 247         Attribute       *csn_a;
 248         char            gid[DB_XIDDATASIZE];
 249         char            csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
 250         int                     num_retries = 0;
 251         int                     ctxcsn_added = 0;
 252         int                     rc;
 253         struct sync_cookie syncCookie = { NULL, -1, NULL};
 254         syncinfo_t      *si;
 255         u_int32_t       ctxcsn_locker = 0;
 256
 257         if ( op->o_sync_mode != SLAP_SYNC_NONE &&
 258                  !LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 259                 char substr[67];
 260                 struct berval ctxcsn_ndn = BER_BVNULL;
 261                 struct berval bv;
 262
 263                 LDAP_STAILQ_FOREACH( si, &op->o_bd->be_syncinfo, si_next ) {
 264                         sprintf( substr, "cn=syncrepl%ld", si->si_rid );
 265                         ber_str2bv( substr, 0, 0, &bv );
 266                         build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0], &bv, op->o_tmpmemctx );
 267
 268 consumer_ctxcsn_retry :
 269                         rs->sr_err = bdb_dn2entry( op, NULL, &ctxcsn_ndn, &ctxcsn_ei,
 270                                                                                 0, locker, ctxcsn_lock );
 271                         switch(rs->sr_err) {
 272                         case DB_LOCK_DEADLOCK:
 273                         case DB_LOCK_NOTGRANTED:
 274                                 goto consumer_ctxcsn_retry;
 275                         case 0:
 276                                 op->o_tmpfree( ctxcsn_ndn.bv_val, op->o_tmpmemctx );
 277                                 ctxcsn_ndn.bv_val = NULL;
 278                                 if ( ctxcsn_ei ) {
 279                                         ctxcsn_e = ctxcsn_ei->bei_e;
 280                                 }
 281                                 break;
 282                         case DB_NOTFOUND:
 283                         default:
 284                                 rs->sr_err = LDAP_OTHER;
 285                         case LDAP_BUSY:
 286                                 op->o_tmpfree( ctxcsn_ndn.bv_val, op->o_tmpmemctx );
 287                                 ctxcsn_ndn.bv_val = NULL;
 288                                 goto done;
 289                         }
 290
 291                         if ( ctxcsn_e ) {
 292                                 csn_a = attr_find( ctxcsn_e->e_attrs,
 293                                                         slap_schema.si_ad_syncreplCookie );
 294                                 if ( csn_a ) {
 295                                         struct berval cookie;
 296                                         const char *text;
 297                                         int match = -1;
 298                                         ber_dupbv( &cookie, &csn_a->a_vals[0] );
 299                                         ber_bvarray_add( &syncCookie.octet_str, &cookie );
 300                                         slap_parse_sync_cookie( &syncCookie );
 301                                         if ( *search_context_csn &&
 302                                                 (*search_context_csn)->bv_val != NULL )
 303                                         {
 304                                                 value_match( &match, slap_schema.si_ad_entryCSN,
 305                                                         slap_schema.si_ad_entryCSN->ad_type->sat_ordering,
 306                                                         SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
 307                                                         syncCookie.ctxcsn, *search_context_csn, &text );
 308                                         }
 309                                         if ( match < 0 ) {
 310                                                 /* set search_context_csn to the
 311                                                    smallest syncrepl cookie value */
 312                                                 if ( *search_context_csn ) {
 313                                                         ch_free( (*search_context_csn)->bv_val );
 314                                                         ch_free( *search_context_csn );
 315                                                 }
 316                                                 *search_context_csn = ber_dupbv( NULL,
 317                                                         syncCookie.ctxcsn );
 318                                         }
 319                                         slap_sync_cookie_free( &syncCookie, 0 );
 320                                 } else {
 321                                         *search_context_csn = NULL;
 322                                 }
 323                         } else {
 324                                 *search_context_csn = NULL;
 325                         }
 326                 }
 327         } else if ( op->o_sync_mode != SLAP_SYNC_NONE &&
 328                  LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
 329
 330 provider_ctxcsn_retry :
 331                 rs->sr_err = bdb_dn2entry( op, NULL, &op->o_bd->be_context_csn, &ctxcsn_ei,
 332                                                                         0, locker, ctxcsn_lock );
 333                 switch(rs->sr_err) {
 334                 case 0:
 335                         if ( ctxcsn_ei ) {
 336                                 ctxcsn_e = ctxcsn_ei->bei_e;
 337                         }
 338                         break;
 339                 case LDAP_BUSY:
 340                         goto done;
 341                 case DB_LOCK_DEADLOCK:
 342                 case DB_LOCK_NOTGRANTED:
 343                         goto provider_ctxcsn_retry;
 344                 case DB_NOTFOUND:
 345                         snprintf( gid, sizeof( gid ), "%s-%08lx-%08lx",
 346                                 bdb_uuid.bv_val, (long) op->o_connid, (long) op->o_opid );
 347
 348                         slap_get_csn( op, csnbuf, sizeof(csnbuf), &csn, 1 );
 349
 350                         if ( 0 ) {
 351 txn_retry:
 352                                 rs->sr_err = TXN_ABORT( ltid );
 353                                 ltid = NULL;
 354                                 if ( rs->sr_err != 0 ) {
 355                                         rs->sr_err = LDAP_OTHER;
 356                                         goto done;
 357                                 }
 358                                 ldap_pvt_thread_yield();
 359                                 bdb_trans_backoff( ++num_retries );
 360                         }
 361                         rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, NULL,
 362                                                                 &ltid, bdb->bi_db_opflags );
 363                         if ( rs->sr_err != 0 ) {
 364                                 rs->sr_err = LDAP_OTHER;
 365                                 goto done;
 366                         }
 367
 368                         ctxcsn_locker = TXN_ID ( ltid );
 369
 370                         rs->sr_err = bdb_csn_commit( op, rs, ltid, NULL, &suffix_ei,
 371                                                                         &ctxcsn_e, &ctxcsn_added, ctxcsn_locker );
 372                         switch( rs->sr_err ) {
 373                         case BDB_CSN_ABORT:
 374                                 rs->sr_err = LDAP_OTHER;
 375                                 goto done;
 376                         case BDB_CSN_RETRY:
 377                                 goto txn_retry;
 378                         }
 379
 380                         rs->sr_err = TXN_PREPARE( ltid, gid );
 381                         if ( rs->sr_err != 0 ) {
 382                                 rs->sr_err = LDAP_OTHER;
 383                                 goto done;
 384                         }
 385
 386                         bdb_cache_add( bdb, suffix_ei, ctxcsn_e,
 387                                         (struct berval *)&slap_ldapsync_cn_bv, ctxcsn_locker );
 388
 389                         rs->sr_err = TXN_COMMIT( ltid, 0 );
 390                         if ( rs->sr_err != 0 ) {
 391                                 rs->sr_err = LDAP_OTHER;
 392                                 goto done;
 393                         }
 394
 395                         rs->sr_err = bdb_dn2entry( op, NULL, &op->o_bd->be_context_csn, &ctxcsn_ei,
 396                                     0, ctxcsn_locker, ctxcsn_lock );
 397
 398                         if ( ctxcsn_ei ) {
 399                                 ctxcsn_e = ctxcsn_ei->bei_e;
 400                         }
 401                         break;
 402
 403                 default:
 404                         rs->sr_err = LDAP_OTHER;
 405                         goto done;
 406                 }
 407
 408                 if ( ctxcsn_e ) {
 409                         csn_a = attr_find( ctxcsn_e->e_attrs,
 410                                                 slap_schema.si_ad_contextCSN );
 411                         if ( csn_a ) {
 412                                 *search_context_csn = ber_dupbv( NULL, &csn_a->a_vals[0] );
 413                         } else {
 414                                 *search_context_csn = NULL;
 415                         }
 416                 } else {
 417                         *search_context_csn = NULL;
 418                 }
 419         }
 420
 421         ltid = NULL;
 422         rs->sr_err = LDAP_SUCCESS;
 423
 424 done:
 425     if( ltid != NULL ) {
 426         TXN_ABORT( ltid );
 427     }
 428
 429         return rs->sr_err;
 430 }