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

   1 /* $OpenLDAP$ */
   2 /*
   3  * back-bdb Context CSN Management Routines
   4  */
   5 /* Copyright (c) 2003 by International Business Machines, Inc.
   6  *
   7  * International Business Machines, Inc. (hereinafter called IBM) grants
   8  * permission under its copyrights to use, copy, modify, and distribute this
   9  * Software with or without fee, provided that the above copyright notice and
  10  * all paragraphs of this notice appear in all copies, and that the name of IBM
  11  * not be used in connection with the marketing of any product incorporating
  12  * the Software or modifications thereof, without specific, written prior
  13  * permission.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES,
  16  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  17  * PARTICULAR PURPOSE.  IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL,
  18  * DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING
  19  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN
  20  * IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.
  21  */
  22
  23 #include "portable.h"
  24
  25 #include <stdio.h>
  26
  27 #include <ac/string.h>
  28 #include <ac/time.h>
  29
  30 #include "lutil.h"
  31 #include "back-bdb.h"
  32 #include "external.h"
  33
  34 int
  35 bdb_csn_commit(
  36         Operation *op,
  37         SlapReply *rs,
  38         DB_TXN *tid,
  39         EntryInfo *ei,
  40         EntryInfo **suffix_ei,
  41         Entry **ctxcsn_e,
  42         int *ctxcsn_added,
  43         u_int32_t locker
  44 )
  45 {
  46         struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
  47         EntryInfo               *ctxcsn_ei = NULL;
  48         DB_LOCK                 ctxcsn_lock;
  49         struct berval   max_committed_csn;
  50         DB_LOCK                 suffix_lock;
  51         int                             rc, ret;
  52         ID                              ctxcsn_id;
  53         Entry                   *e;
  54         char                    textbuf[SLAP_TEXT_BUFLEN];
  55         size_t                  textlen = sizeof textbuf;
  56         EntryInfo               *eip = NULL;
  57
  58         if ( ei ) {
  59                 e = ei->bei_e;
  60         }
  61
  62         bdb_cache_find_ndn( op, tid, op->o_bd->be_nsuffix, &ctxcsn_ei );
  63         bdb_cache_entryinfo_unlock( ctxcsn_ei );
  64         rc = bdb_cache_find_ndn( op, tid, &slap_ldapsync_cn_bv, &ctxcsn_ei );
  65         if ( rc == 0 ) {
  66                 rc = bdb_cache_find_id( op, tid, ctxcsn_ei->bei_id, &ctxcsn_ei, 1,
  67                         locker, &ctxcsn_lock );
  68                 *ctxcsn_e = ctxcsn_ei->bei_e;
  69         } else {
  70                 bdb_cache_entryinfo_unlock( ctxcsn_ei );
  71         }
  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                         ch_free( max_committed_csn.bv_val );
  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_bvalues = 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                         ch_free( max_committed_csn.bv_val );
 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                 ch_free( max_committed_csn.bv_val );
 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 contex 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 ctxcsn_ndn = BER_BVNULL;
 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
 266         if ( op->o_sync_mode != SLAP_SYNC_NONE ) {
 267                 if ( op->o_bd->syncinfo ) {
 268                         char substr[67];
 269                         struct berval bv;
 270                         sprintf( substr, "cn=syncrepl%d", op->o_bd->syncinfo->id );
 271                         ber_str2bv( substr, 0, 0, &bv );
 272                         build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0], &bv );
 273                 } else {
 274                         build_new_dn( &ctxcsn_ndn, &op->o_bd->be_nsuffix[0], (struct berval *)&slap_ldapsync_cn_bv );
 275                 }
 276
 277 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 0:
 282                         ch_free( ctxcsn_ndn.bv_val );
 283                         if ( ctxcsn_ei ) {
 284                                 ctxcsn_e = ctxcsn_ei->bei_e;
 285                         }
 286                         break;
 287         case LDAP_BUSY:
 288                         ch_free( ctxcsn_ndn.bv_val );
 289                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 290                         return LDAP_BUSY;
 291         case DB_LOCK_DEADLOCK:
 292         case DB_LOCK_NOTGRANTED:
 293                         goto ctxcsn_retry;
 294         case DB_NOTFOUND:
 295                         if ( !op->o_bd->syncinfo ) {
 296                                 snprintf( gid, sizeof( gid ), "%s-%08lx-%08lx",
 297                                                         bdb_uuid.bv_val, (long) op->o_connid, (long) op->o_opid );
 298
 299                                 slap_get_csn( op, csnbuf, sizeof(csnbuf), &csn, 1 );
 300
 301                                 if ( 0 ) {
 302 txn_retry:
 303                                         rs->sr_err = TXN_ABORT( ltid );
 304                                         if ( rs->sr_err != 0 ) {
 305                                                 rs->sr_err = LDAP_OTHER;
 306                                                 return rs->sr_err;
 307                                         }
 308
 309                                         bdb_trans_backoff( ++num_retries );
 310                                         ldap_pvt_thread_yield();
 311                                 }
 312                                 rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, NULL, &ltid, bdb->bi_db_opflags );
 313                                 if ( rs->sr_err != 0 ) {
 314                                         rs->sr_err = LDAP_OTHER;
 315                                         return rs->sr_err;
 316                                 }
 317
 318                                 rs->sr_err = bdb_csn_commit( op, rs, ltid, NULL, &suffix_ei,
 319                                                                                 &ctxcsn_e, &ctxcsn_added, locker );
 320                                 switch( rs->sr_err ) {
 321                                 case BDB_CSN_ABORT:
 322                                         LOCK_ID_FREE( bdb->bi_dbenv, locker );
 323                                         return LDAP_OTHER;
 324                                 case BDB_CSN_RETRY:
 325                                         goto txn_retry;
 326                                 }
 327
 328                                 rs->sr_err = TXN_PREPARE( ltid, gid );
 329                                 if ( rs->sr_err != 0 ) {
 330                                         rs->sr_err = LDAP_OTHER;
 331                                         return rs->sr_err;
 332                                 }
 333
 334                                 bdb_cache_add( bdb, suffix_ei, ctxcsn_e, (struct berval *)&slap_ldapsync_cn_bv, locker );
 335
 336                                 rs->sr_err = TXN_COMMIT( ltid, 0 );
 337                                 if ( rs->sr_err != 0 ) {
 338                                         rs->sr_err = LDAP_OTHER;
 339                                         return rs->sr_err;
 340                                 }
 341
 342                                 ctxcsn_ei = NULL;
 343                                 rs->sr_err = bdb_dn2entry( op, NULL, &ctxcsn_ndn, &ctxcsn_ei,
 344                                                                                 0, locker, ctxcsn_lock );
 345                                 ch_free( ctxcsn_ndn.bv_val );
 346
 347                                 if ( ctxcsn_ei ) {
 348                                         ctxcsn_e = ctxcsn_ei->bei_e;
 349                                 }
 350                         } else {
 351                                 LOCK_ID_FREE( bdb->bi_dbenv, locker );
 352                                 return LDAP_OTHER;
 353                         }
 354                         break;
 355
 356                 default:
 357                         LOCK_ID_FREE (bdb->bi_dbenv, locker );
 358                         return LDAP_OTHER;
 359                 }
 360
 361                 if ( ctxcsn_e ) {
 362                         if ( op->o_bd->syncinfo ) {
 363                                 csn_a = attr_find( ctxcsn_e->e_attrs, slap_schema.si_ad_syncreplCookie );
 364                         } else {
 365                                 csn_a = attr_find( ctxcsn_e->e_attrs, slap_schema.si_ad_contextCSN );
 366                         }
 367                         if ( csn_a ) {
 368                                 *search_context_csn = ber_dupbv( NULL, &csn_a->a_vals[0] );
 369                         } else {
 370                                 *search_context_csn = NULL;
 371                         }
 372                 } else {
 373                         *search_context_csn = NULL;
 374                 }
 375         }
 376
 377         return LDAP_SUCCESS;
 378 }