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

   1 /* idl.c - ldap id list handling routines */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2000-2004 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16
  17 #include "portable.h"
  18
  19 #include <stdio.h>
  20 #include <ac/string.h>
  21
  22 #include "back-bdb.h"
  23 #include "idl.h"
  24
  25 #define IDL_MAX(x,y)    ( x > y ? x : y )
  26 #define IDL_MIN(x,y)    ( x < y ? x : y )
  27
  28 #define IDL_CMP(x,y)    ( x < y ? -1 : ( x > y ? 1 : 0 ) )
  29
  30 #define IDL_LRU_DELETE( bdb, e ) do {                                   \
  31         if ( e->idl_lru_prev != NULL ) {                                \
  32                 e->idl_lru_prev->idl_lru_next = e->idl_lru_next;        \
  33         } else {                                                        \
  34                 bdb->bi_idl_lru_head = e->idl_lru_next;                 \
  35         }                                                               \
  36         if ( e->idl_lru_next != NULL ) {                                \
  37                 e->idl_lru_next->idl_lru_prev = e->idl_lru_prev;        \
  38         } else {                                                        \
  39                 bdb->bi_idl_lru_tail = e->idl_lru_prev;                 \
  40         }                                                               \
  41 } while ( 0 )
  42
  43 #define IDL_LRU_ADD( bdb, e ) do {                                      \
  44         e->idl_lru_next = bdb->bi_idl_lru_head;                         \
  45         if ( e->idl_lru_next != NULL ) {                                \
  46                 e->idl_lru_next->idl_lru_prev = (e);                    \
  47         }                                                               \
  48         (bdb)->bi_idl_lru_head = (e);                                   \
  49         e->idl_lru_prev = NULL;                                         \
  50         if ( (bdb)->bi_idl_lru_tail == NULL ) {                         \
  51                 (bdb)->bi_idl_lru_tail = (e);                           \
  52         }                                                               \
  53 } while ( 0 )
  54
  55 static int
  56 bdb_idl_entry_cmp( const void *v_idl1, const void *v_idl2 )
  57 {
  58         const bdb_idl_cache_entry_t *idl1 = v_idl1, *idl2 = v_idl2;
  59         int rc;
  60
  61         if ((rc = SLAP_PTRCMP( idl1->db, idl2->db ))) return rc;
  62         if ((rc = idl1->kstr.bv_len - idl2->kstr.bv_len )) return rc;
  63         return ( memcmp ( idl1->kstr.bv_val, idl2->kstr.bv_val , idl1->kstr.bv_len ) );
  64 }
  65
  66 #if IDL_DEBUG > 0
  67 static void idl_check( ID *ids )
  68 {
  69         if( BDB_IDL_IS_RANGE( ids ) ) {
  70                 assert( BDB_IDL_RANGE_FIRST(ids) <= BDB_IDL_RANGE_LAST(ids) );
  71         } else {
  72                 ID i;
  73                 for( i=1; i < ids[0]; i++ ) {
  74                         assert( ids[i+1] > ids[i] );
  75                 }
  76         }
  77 }
  78
  79 #if IDL_DEBUG > 1
  80 static void idl_dump( ID *ids )
  81 {
  82         if( BDB_IDL_IS_RANGE( ids ) ) {
  83                 Debug( LDAP_DEBUG_ANY,
  84                         "IDL: range ( %ld - %ld )\n",
  85                         (long) BDB_IDL_RANGE_FIRST( ids ),
  86                         (long) BDB_IDL_RANGE_LAST( ids ) );
  87
  88         } else {
  89                 ID i;
  90                 Debug( LDAP_DEBUG_ANY, "IDL: size %ld", (long) ids[0], 0, 0 );
  91
  92                 for( i=1; i<=ids[0]; i++ ) {
  93                         if( i % 16 == 1 ) {
  94                                 Debug( LDAP_DEBUG_ANY, "\n", 0, 0, 0 );
  95                         }
  96                         Debug( LDAP_DEBUG_ANY, "  %02lx", (long) ids[i], 0, 0 );
  97                 }
  98
  99                 Debug( LDAP_DEBUG_ANY, "\n", 0, 0, 0 );
 100         }
 101
 102         idl_check( ids );
 103 }
 104 #endif /* IDL_DEBUG > 1 */
 105 #endif /* IDL_DEBUG > 0 */
 106
 107 unsigned bdb_idl_search( ID *ids, ID id )
 108 {
 109 #define IDL_BINARY_SEARCH 1
 110 #ifdef IDL_BINARY_SEARCH
 111         /*
 112          * binary search of id in ids
 113          * if found, returns position of id
 114          * if not found, returns first postion greater than id
 115          */
 116         unsigned base = 0;
 117         unsigned cursor = 0;
 118         int val = 0;
 119         unsigned n = ids[0];
 120
 121 #if IDL_DEBUG > 0
 122         idl_check( ids );
 123 #endif
 124
 125         while( 0 < n ) {
 126                 int pivot = n >> 1;
 127                 cursor = base + pivot;
 128                 val = IDL_CMP( id, ids[cursor + 1] );
 129
 130                 if( val < 0 ) {
 131                         n = pivot;
 132
 133                 } else if ( val > 0 ) {
 134                         base = cursor + 1;
 135                         n -= pivot + 1;
 136
 137                 } else {
 138                         return cursor + 1;
 139                 }
 140         }
 141
 142         if( val > 0 ) {
 143                 return cursor + 2;
 144         } else {
 145                 return cursor + 1;
 146         }
 147
 148 #else
 149         /* (reverse) linear search */
 150         int i;
 151
 152 #if IDL_DEBUG > 0
 153         idl_check( ids );
 154 #endif
 155
 156         for( i=ids[0]; i; i-- ) {
 157                 if( id > ids[i] ) {
 158                         break;
 159                 }
 160         }
 161
 162         return i+1;
 163 #endif
 164 }
 165
 166 int bdb_idl_insert( ID *ids, ID id )
 167 {
 168         unsigned x;
 169
 170 #if IDL_DEBUG > 1
 171         Debug( LDAP_DEBUG_ANY, "insert: %04lx at %d\n", (long) id, x, 0 );
 172         idl_dump( ids );
 173 #elif IDL_DEBUG > 0
 174         idl_check( ids );
 175 #endif
 176
 177         if (BDB_IDL_IS_RANGE( ids )) {
 178                 /* if already in range, treat as a dup */
 179                 if (id >= BDB_IDL_FIRST(ids) && id <= BDB_IDL_LAST(ids))
 180                         return -1;
 181                 if (id < BDB_IDL_FIRST(ids))
 182                         ids[1] = id;
 183                 else if (id > BDB_IDL_LAST(ids))
 184                         ids[2] = id;
 185                 return 0;
 186         }
 187
 188         x = bdb_idl_search( ids, id );
 189         assert( x > 0 );
 190
 191         if( x < 1 ) {
 192                 /* internal error */
 193                 return -2;
 194         }
 195
 196         if ( x <= ids[0] && ids[x] == id ) {
 197                 /* duplicate */
 198                 return -1;
 199         }
 200
 201         if ( ++ids[0] >= BDB_IDL_DB_MAX ) {
 202                 if( id < ids[1] ) {
 203                         ids[1] = id;
 204                         ids[2] = ids[ids[0]-1];
 205                 } else if ( ids[ids[0]-1] < id ) {
 206                         ids[2] = id;
 207                 } else {
 208                         ids[2] = ids[ids[0]-1];
 209                 }
 210                 ids[0] = NOID;
 211
 212         } else {
 213                 /* insert id */
 214                 AC_MEMCPY( &ids[x+1], &ids[x], (ids[0]-x) * sizeof(ID) );
 215                 ids[x] = id;
 216         }
 217
 218 #if IDL_DEBUG > 1
 219         idl_dump( ids );
 220 #elif IDL_DEBUG > 0
 221         idl_check( ids );
 222 #endif
 223
 224         return 0;
 225 }
 226
 227 #if 0   /* unused */
 228 static int idl_delete( ID *ids, ID id )
 229 {
 230         unsigned x = bdb_idl_search( ids, id );
 231
 232 #if IDL_DEBUG > 1
 233         Debug( LDAP_DEBUG_ANY, "delete: %04lx at %d\n", (long) id, x, 0 );
 234         idl_dump( ids );
 235 #elif IDL_DEBUG > 0
 236         idl_check( ids );
 237 #endif
 238
 239         assert( x > 0 );
 240
 241         if( x <= 0 ) {
 242                 /* internal error */
 243                 return -2;
 244         }
 245
 246         if( x > ids[0] || ids[x] != id ) {
 247                 /* not found */
 248                 return -1;
 249
 250         } else if ( --ids[0] == 0 ) {
 251                 if( x != 1 ) {
 252                         return -3;
 253                 }
 254
 255         } else {
 256                 AC_MEMCPY( &ids[x], &ids[x+1], (1+ids[0]-x) * sizeof(ID) );
 257         }
 258
 259 #if IDL_DEBUG > 1
 260         idl_dump( ids );
 261 #elif IDL_DEBUG > 0
 262         idl_check( ids );
 263 #endif
 264
 265         return 0;
 266 }
 267 #endif  /* unused */
 268
 269 static char *
 270 bdb_show_key(
 271         DBT             *key,
 272         char            *buf )
 273 {
 274         if ( key->size == sizeof( ID ) ) {
 275                 unsigned char *c = key->data;
 276                 sprintf( buf, "[%02x%02x%02x%02x]", c[0], c[1], c[2], c[3] );
 277                 return buf;
 278         } else {
 279                 return key->data;
 280         }
 281 }
 282
 283 /* Find a db/key pair in the IDL cache. If ids is non-NULL,
 284  * copy the cached IDL into it, otherwise just return the status.
 285  */
 286 int
 287 bdb_idl_cache_get(
 288         struct bdb_info *bdb,
 289         DB                      *db,
 290         DBT                     *key,
 291         ID                      *ids )
 292 {
 293         bdb_idl_cache_entry_t idl_tmp;
 294         bdb_idl_cache_entry_t *matched_idl_entry;
 295
 296         DBT2bv( key, &idl_tmp.kstr );
 297         idl_tmp.db = db;
 298         ldap_pvt_thread_rdwr_rlock( &bdb->bi_idl_tree_rwlock );
 299         matched_idl_entry = avl_find( bdb->bi_idl_tree, &idl_tmp,
 300                                       bdb_idl_entry_cmp );
 301         if ( matched_idl_entry != NULL ) {
 302                 if ( matched_idl_entry->idl && ids )
 303                         BDB_IDL_CPY( ids, matched_idl_entry->idl );
 304                 ldap_pvt_thread_rdwr_runlock( &bdb->bi_idl_tree_rwlock );
 305                 ldap_pvt_thread_mutex_lock( &bdb->bi_idl_tree_lrulock );
 306                 IDL_LRU_DELETE( bdb, matched_idl_entry );
 307                 IDL_LRU_ADD( bdb, matched_idl_entry );
 308                 ldap_pvt_thread_mutex_unlock( &bdb->bi_idl_tree_lrulock );
 309                 if ( matched_idl_entry->idl )
 310                         return LDAP_SUCCESS;
 311                 else
 312                         return DB_NOTFOUND;
 313         }
 314         ldap_pvt_thread_rdwr_runlock( &bdb->bi_idl_tree_rwlock );
 315
 316         return LDAP_NO_SUCH_OBJECT;
 317 }
 318
 319 void
 320 bdb_idl_cache_put(
 321         struct bdb_info *bdb,
 322         DB                      *db,
 323         DBT                     *key,
 324         ID                      *ids,
 325         int                     rc )
 326 {
 327         bdb_idl_cache_entry_t idl_tmp;
 328         bdb_idl_cache_entry_t *ee;
 329
 330         DBT2bv( key, &idl_tmp.kstr );
 331
 332         ee = (bdb_idl_cache_entry_t *) ch_malloc(
 333                 sizeof( bdb_idl_cache_entry_t ) );
 334         ee->db = db;
 335         if ( rc == DB_NOTFOUND) {
 336                 ee->idl = NULL;
 337         } else {
 338                 ee->idl = (ID*) ch_malloc( BDB_IDL_SIZEOF ( ids ) );
 339                 BDB_IDL_CPY( ee->idl, ids );
 340         }
 341         ee->idl_lru_prev = NULL;
 342         ee->idl_lru_next = NULL;
 343         ber_dupbv( &ee->kstr, &idl_tmp.kstr );
 344         ldap_pvt_thread_rdwr_wlock( &bdb->bi_idl_tree_rwlock );
 345         if ( avl_insert( &bdb->bi_idl_tree, (caddr_t) ee,
 346                 bdb_idl_entry_cmp, avl_dup_error ))
 347         {
 348                 ch_free( ee->kstr.bv_val );
 349                 ch_free( ee->idl );
 350                 ch_free( ee );
 351                 ldap_pvt_thread_rdwr_wunlock( &bdb->bi_idl_tree_rwlock );
 352                 return;
 353         }
 354         ldap_pvt_thread_mutex_lock( &bdb->bi_idl_tree_lrulock );
 355         IDL_LRU_ADD( bdb, ee );
 356         if ( ++bdb->bi_idl_cache_size > bdb->bi_idl_cache_max_size ) {
 357                 int i = 0;
 358                 while ( bdb->bi_idl_lru_tail != NULL && i < 10 ) {
 359                         ee = bdb->bi_idl_lru_tail;
 360                         if ( avl_delete( &bdb->bi_idl_tree, (caddr_t) ee,
 361                                     bdb_idl_entry_cmp ) == NULL ) {
 362                                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_cache_put: "
 363                                         "AVL delete failed\n",
 364                                         0, 0, 0 );
 365                         }
 366                         IDL_LRU_DELETE( bdb, ee );
 367                         i++;
 368                         --bdb->bi_idl_cache_size;
 369                         ch_free( ee->kstr.bv_val );
 370                         ch_free( ee->idl );
 371                         ch_free( ee );
 372                 }
 373         }
 374
 375         ldap_pvt_thread_mutex_unlock( &bdb->bi_idl_tree_lrulock );
 376         ldap_pvt_thread_rdwr_wunlock( &bdb->bi_idl_tree_rwlock );
 377 }
 378
 379 void
 380 bdb_idl_cache_del(
 381         struct bdb_info *bdb,
 382         DB                      *db,
 383         DBT                     *key )
 384 {
 385         bdb_idl_cache_entry_t *matched_idl_entry, idl_tmp;
 386         DBT2bv( key, &idl_tmp.kstr );
 387         idl_tmp.db = db;
 388         ldap_pvt_thread_rdwr_wlock( &bdb->bi_idl_tree_rwlock );
 389         matched_idl_entry = avl_find( bdb->bi_idl_tree, &idl_tmp,
 390                                       bdb_idl_entry_cmp );
 391         if ( matched_idl_entry != NULL ) {
 392                 if ( avl_delete( &bdb->bi_idl_tree, (caddr_t) matched_idl_entry,
 393                                     bdb_idl_entry_cmp ) == NULL ) {
 394                         Debug( LDAP_DEBUG_ANY, "=> bdb_idl_cache_del: "
 395                                 "AVL delete failed\n",
 396                                 0, 0, 0 );
 397                 }
 398                 --bdb->bi_idl_cache_size;
 399                 ldap_pvt_thread_mutex_lock( &bdb->bi_idl_tree_lrulock );
 400                 IDL_LRU_DELETE( bdb, matched_idl_entry );
 401                 ldap_pvt_thread_mutex_unlock( &bdb->bi_idl_tree_lrulock );
 402                 free( matched_idl_entry->kstr.bv_val );
 403                 if ( matched_idl_entry->idl )
 404                         free( matched_idl_entry->idl );
 405                 free( matched_idl_entry );
 406         }
 407         ldap_pvt_thread_rdwr_wunlock( &bdb->bi_idl_tree_rwlock );
 408 }
 409
 410 int
 411 bdb_idl_fetch_key(
 412         BackendDB       *be,
 413         DB                      *db,
 414         DB_TXN          *tid,
 415         DBT                     *key,
 416         ID                      *ids,
 417         DBC                     **saved_cursor,
 418         int                     get_flag )
 419 {
 420         struct bdb_info *bdb = (struct bdb_info *) be->be_private;
 421         int rc;
 422         DBT data, key2, *kptr;
 423         DBC *cursor;
 424         ID *i;
 425         void *ptr;
 426         size_t len;
 427         int rc2;
 428         int flags = bdb->bi_db_opflags | DB_MULTIPLE;
 429         int opflag;
 430
 431         /* If using BerkeleyDB 4.0, the buf must be large enough to
 432          * grab the entire IDL in one get(), otherwise BDB will leak
 433          * resources on subsequent get's.  We can safely call get()
 434          * twice - once for the data, and once to get the DB_NOTFOUND
 435          * result meaning there's no more data. See ITS#2040 for details.
 436          * This bug is fixed in BDB 4.1 so a smaller buffer will work if
 437          * stack space is too limited.
 438          *
 439          * configure now requires Berkeley DB 4.1.
 440          */
 441 #if DB_VERSION_FULL < 0x04010000
 442 #       define BDB_ENOUGH 5
 443 #else
 444 #       define BDB_ENOUGH 1
 445 #endif
 446         ID buf[BDB_IDL_DB_SIZE*BDB_ENOUGH];
 447
 448         char keybuf[16];
 449
 450         Debug( LDAP_DEBUG_ARGS,
 451                 "bdb_idl_fetch_key: %s\n",
 452                 bdb_show_key( key, keybuf ), 0, 0 );
 453
 454         assert( ids != NULL );
 455
 456         if ( saved_cursor && *saved_cursor ) {
 457                 opflag = DB_NEXT;
 458         } else if ( get_flag == LDAP_FILTER_GE ) {
 459                 opflag = DB_SET_RANGE;
 460         } else if ( get_flag == LDAP_FILTER_LE ) {
 461                 opflag = DB_FIRST;
 462         } else {
 463                 opflag = DB_SET;
 464         }
 465
 466         /* only non-range lookups can use the IDL cache */
 467         if ( bdb->bi_idl_cache_size && opflag == DB_SET ) {
 468                 rc = bdb_idl_cache_get( bdb, db, key, ids );
 469                 if ( rc != LDAP_NO_SUCH_OBJECT ) return rc;
 470         }
 471
 472         DBTzero( &data );
 473
 474         data.data = buf;
 475         data.ulen = sizeof(buf);
 476         data.flags = DB_DBT_USERMEM;
 477
 478         if ( tid ) flags |= DB_RMW;
 479
 480         /* If we're not reusing an existing cursor, get a new one */
 481         if( opflag != DB_NEXT )
 482                 rc = db->cursor( db, tid, &cursor, bdb->bi_db_opflags );
 483         else
 484                 cursor = *saved_cursor;
 485         if( rc != 0 ) {
 486                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
 487                         "cursor failed: %s (%d)\n", db_strerror(rc), rc, 0 );
 488                 return rc;
 489         }
 490
 491         /* If this is a LE lookup, save original key so we can determine
 492          * when to stop. If this is a GE lookup, save the key since it
 493          * will be overwritten.
 494          */
 495         if ( get_flag == LDAP_FILTER_LE || get_flag == LDAP_FILTER_GE ) {
 496                 DBTzero( &key2 );
 497                 key2.flags = DB_DBT_USERMEM;
 498                 key2.ulen = sizeof(keybuf);
 499                 key2.data = keybuf;
 500                 key2.size = key->size;
 501                 AC_MEMCPY( keybuf, key->data, key->size );
 502                 kptr = &key2;
 503         } else {
 504                 kptr = key;
 505         }
 506         len = key->size;
 507         rc = cursor->c_get( cursor, kptr, &data, flags | opflag );
 508
 509         /* skip presence key on range inequality lookups */
 510         while (rc == 0 && kptr->size != len) {
 511                 rc = cursor->c_get( cursor, kptr, &data, flags | DB_NEXT_NODUP );
 512         }
 513         /* If we're doing a LE compare and the new key is greater than
 514          * our search key, we're done
 515          */
 516         if (rc == 0 && get_flag == LDAP_FILTER_LE && memcmp( kptr->data,
 517                 key->data, key->size ) > 0 ) {
 518                 rc = DB_NOTFOUND;
 519         }
 520         if (rc == 0) {
 521                 i = ids;
 522                 while (rc == 0) {
 523                         u_int8_t *j;
 524
 525                         DB_MULTIPLE_INIT( ptr, &data );
 526                         while (ptr) {
 527                                 DB_MULTIPLE_NEXT(ptr, &data, j, len);
 528                                 if (j) {
 529                                         ++i;
 530                                         BDB_DISK2ID( j, i );
 531                                 }
 532                         }
 533                         rc = cursor->c_get( cursor, key, &data, flags | DB_NEXT_DUP );
 534                 }
 535                 if ( rc == DB_NOTFOUND ) rc = 0;
 536                 ids[0] = i - ids;
 537                 /* On disk, a range is denoted by 0 in the first element */
 538                 if (ids[1] == 0) {
 539                         if (ids[0] != BDB_IDL_RANGE_SIZE) {
 540                                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
 541                                         "range size mismatch: expected %d, got %ld\n",
 542                                         BDB_IDL_RANGE_SIZE, ids[0], 0 );
 543                                 cursor->c_close( cursor );
 544                                 return -1;
 545                         }
 546                         BDB_IDL_RANGE( ids, ids[2], ids[3] );
 547                 }
 548                 data.size = BDB_IDL_SIZEOF(ids);
 549         }
 550
 551         if ( saved_cursor && rc == 0 ) {
 552                 if ( !*saved_cursor )
 553                         *saved_cursor = cursor;
 554                 rc2 = 0;
 555         }
 556         else
 557                 rc2 = cursor->c_close( cursor );
 558         if (rc2) {
 559                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
 560                         "close failed: %s (%d)\n", db_strerror(rc2), rc2, 0 );
 561                 return rc2;
 562         }
 563
 564         if( rc == DB_NOTFOUND ) {
 565                 return rc;
 566
 567         } else if( rc != 0 ) {
 568                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
 569                         "get failed: %s (%d)\n",
 570                         db_strerror(rc), rc, 0 );
 571                 return rc;
 572
 573         } else if ( data.size == 0 || data.size % sizeof( ID ) ) {
 574                 /* size not multiple of ID size */
 575                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
 576                         "odd size: expected %ld multiple, got %ld\n",
 577                         (long) sizeof( ID ), (long) data.size, 0 );
 578                 return -1;
 579
 580         } else if ( data.size != BDB_IDL_SIZEOF(ids) ) {
 581                 /* size mismatch */
 582                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_fetch_key: "
 583                         "get size mismatch: expected %ld, got %ld\n",
 584                         (long) ((1 + ids[0]) * sizeof( ID )), (long) data.size, 0 );
 585                 return -1;
 586         }
 587
 588         if ( bdb->bi_idl_cache_max_size ) {
 589                 bdb_idl_cache_put( bdb, db, key, ids, rc );
 590         }
 591
 592         return rc;
 593 }
 594
 595
 596 int
 597 bdb_idl_insert_key(
 598         BackendDB       *be,
 599         DB                      *db,
 600         DB_TXN          *tid,
 601         DBT                     *key,
 602         ID                      id )
 603 {
 604         struct bdb_info *bdb = (struct bdb_info *) be->be_private;
 605         int     rc;
 606         DBT data;
 607         DBC *cursor;
 608         ID lo, hi, tmp, nlo, nhi, nid;
 609         char *err;
 610
 611         {
 612                 char buf[16];
 613                 Debug( LDAP_DEBUG_ARGS,
 614                         "bdb_idl_insert_key: %lx %s\n",
 615                         (long) id, bdb_show_key( key, buf ), 0 );
 616         }
 617
 618         assert( id != NOID );
 619
 620         if ( bdb->bi_idl_cache_size ) {
 621                 bdb_idl_cache_del( bdb, db, key );
 622         }
 623
 624         DBTzero( &data );
 625         data.size = sizeof( ID );
 626         data.ulen = data.size;
 627         data.flags = DB_DBT_USERMEM;
 628
 629         BDB_ID2DISK( id, &nid );
 630
 631         rc = db->cursor( db, tid, &cursor, bdb->bi_db_opflags );
 632         if ( rc != 0 ) {
 633                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_insert_key: "
 634                         "cursor failed: %s (%d)\n", db_strerror(rc), rc, 0 );
 635                 return rc;
 636         }
 637         data.data = &nlo;
 638         /* Fetch the first data item for this key, to see if it
 639          * exists and if it's a range.
 640          */
 641         rc = cursor->c_get( cursor, key, &data, DB_SET | DB_RMW );
 642         err = "c_get";
 643         if ( rc == 0 ) {
 644                 if ( nlo != 0 ) {
 645                         /* not a range, count the number of items */
 646                         db_recno_t count;
 647                         rc = cursor->c_count( cursor, &count, 0 );
 648                         if ( rc != 0 ) {
 649                                 err = "c_count";
 650                                 goto fail;
 651                         }
 652                         if ( count >= BDB_IDL_DB_MAX ) {
 653                         /* No room, convert to a range */
 654                                 DBT key2 = *key;
 655
 656                                 key2.dlen = key2.ulen;
 657                                 key2.flags |= DB_DBT_PARTIAL;
 658
 659                                 BDB_DISK2ID( &nlo, &lo );
 660                                 data.data = &nhi;
 661
 662                                 rc = cursor->c_get( cursor, &key2, &data, DB_NEXT_NODUP );
 663                                 if ( rc != 0 && rc != DB_NOTFOUND ) {
 664                                         err = "c_get next_nodup";
 665                                         goto fail;
 666                                 }
 667                                 if ( rc == DB_NOTFOUND ) {
 668                                         rc = cursor->c_get( cursor, key, &data, DB_LAST );
 669                                         if ( rc != 0 ) {
 670                                                 err = "c_get last";
 671                                                 goto fail;
 672                                         }
 673                                 } else {
 674                                         rc = cursor->c_get( cursor, key, &data, DB_PREV );
 675                                         if ( rc != 0 ) {
 676                                                 err = "c_get prev";
 677                                                 goto fail;
 678                                         }
 679                                 }
 680                                 BDB_DISK2ID( &nhi, &hi );
 681                                 if ( id < lo ) {
 682                                         lo = id;
 683                                         nlo = nid;
 684                                 } else if ( id > hi ) {
 685                                         hi = id;
 686                                         nhi = nid;
 687                                 }
 688                                 rc = db->del( db, tid, key, 0 );
 689                                 if ( rc != 0 ) {
 690                                         err = "del";
 691                                         goto fail;
 692                                 }
 693                                 data.data = &nid;
 694                                 nid = 0;
 695                                 rc = cursor->c_put( cursor, key, &data, DB_KEYFIRST );
 696                                 if ( rc != 0 ) {
 697                                         err = "c_put 0";
 698                                         goto fail;
 699                                 }
 700                                 nid = nlo;
 701                                 rc = cursor->c_put( cursor, key, &data, DB_KEYLAST );
 702                                 if ( rc != 0 ) {
 703                                         err = "c_put lo";
 704                                         goto fail;
 705                                 }
 706                                 nid = nhi;
 707                                 rc = cursor->c_put( cursor, key, &data, DB_KEYLAST );
 708                                 if ( rc != 0 ) {
 709                                         err = "c_put hi";
 710                                         goto fail;
 711                                 }
 712                         } else {
 713                         /* There's room, just store it */
 714                                 goto put1;
 715                         }
 716                 } else {
 717                         /* It's a range, see if we need to rewrite
 718                          * the boundaries
 719                          */
 720                         hi = id;
 721                         data.data = &nlo;
 722                         rc = cursor->c_get( cursor, key, &data, DB_NEXT_DUP );
 723                         if ( rc != 0 ) {
 724                                 err = "c_get lo";
 725                                 goto fail;
 726                         }
 727                         BDB_DISK2ID( &nlo, &lo );
 728                         if ( id > lo ) {
 729                                 data.data = &nhi;
 730                                 rc = cursor->c_get( cursor, key, &data, DB_NEXT_DUP );
 731                                 if ( rc != 0 ) {
 732                                         err = "c_get hi";
 733                                         goto fail;
 734                                 }
 735                                 BDB_DISK2ID( &nhi, &hi );
 736                         }
 737                         if ( id < lo || id > hi ) {
 738                                 /* Delete the current lo/hi */
 739                                 rc = cursor->c_del( cursor, 0 );
 740                                 if ( rc != 0 ) {
 741                                         err = "c_del";
 742                                         goto fail;
 743                                 }
 744                                 data.data = &nid;
 745                                 rc = cursor->c_put( cursor, key, &data, DB_KEYFIRST );
 746                                 if ( rc != 0 ) {
 747                                         err = "c_put lo/hi";
 748                                         goto fail;
 749                                 }
 750                         }
 751                 }
 752         } else if ( rc == DB_NOTFOUND ) {
 753 put1:           data.data = &nid;
 754                 rc = cursor->c_put( cursor, key, &data, DB_NODUPDATA );
 755                 /* Don't worry if it's already there */
 756                 if ( rc != 0 && rc != DB_KEYEXIST ) {
 757                         err = "c_put id";
 758                         goto fail;
 759                 }
 760         } else {
 761                 /* initial c_get failed, nothing was done */
 762 fail:
 763                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_insert_key: "
 764                         "%s failed: %s (%d)\n", err, db_strerror(rc), rc );
 765                 cursor->c_close( cursor );
 766                 return rc;
 767         }
 768         rc = cursor->c_close( cursor );
 769         if( rc != 0 ) {
 770                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_insert_key: "
 771                         "c_close failed: %s (%d)\n",
 772                         db_strerror(rc), rc, 0 );
 773         }
 774         return rc;
 775 }
 776
 777 int
 778 bdb_idl_delete_key(
 779         BackendDB       *be,
 780         DB                      *db,
 781         DB_TXN          *tid,
 782         DBT                     *key,
 783         ID                      id )
 784 {
 785         struct bdb_info *bdb = (struct bdb_info *) be->be_private;
 786         int     rc;
 787         DBT data;
 788         DBC *cursor;
 789         ID lo, hi, tmp, nid, nlo, nhi;
 790         char *err;
 791
 792         {
 793                 char buf[16];
 794                 Debug( LDAP_DEBUG_ARGS,
 795                         "bdb_idl_delete_key: %lx %s\n",
 796                         (long) id, bdb_show_key( key, buf ), 0 );
 797         }
 798         assert( id != NOID );
 799
 800         if ( bdb->bi_idl_cache_max_size ) {
 801                 bdb_idl_cache_del( bdb, db, key );
 802         }
 803
 804         BDB_ID2DISK( id, &nid );
 805
 806         DBTzero( &data );
 807         data.data = &tmp;
 808         data.size = sizeof( id );
 809         data.ulen = data.size;
 810         data.flags = DB_DBT_USERMEM;
 811
 812         rc = db->cursor( db, tid, &cursor, bdb->bi_db_opflags );
 813         if ( rc != 0 ) {
 814                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_delete_key: "
 815                         "cursor failed: %s (%d)\n", db_strerror(rc), rc, 0 );
 816                 return rc;
 817         }
 818         /* Fetch the first data item for this key, to see if it
 819          * exists and if it's a range.
 820          */
 821         rc = cursor->c_get( cursor, key, &data, DB_SET | DB_RMW );
 822         err = "c_get";
 823         if ( rc == 0 ) {
 824                 if ( tmp != 0 ) {
 825                         /* Not a range, just delete it */
 826                         if (tmp != nid) {
 827                                 /* position to correct item */
 828                                 tmp = nid;
 829                                 rc = cursor->c_get( cursor, key, &data,
 830                                         DB_GET_BOTH | DB_RMW  );
 831                                 if ( rc != 0 ) {
 832                                         err = "c_get id";
 833                                         goto fail;
 834                                 }
 835                         }
 836                         rc = cursor->c_del( cursor, 0 );
 837                         if ( rc != 0 ) {
 838                                 err = "c_del id";
 839                                 goto fail;
 840                         }
 841                 } else {
 842                         /* It's a range, see if we need to rewrite
 843                          * the boundaries
 844                          */
 845                         data.data = &nlo;
 846                         rc = cursor->c_get( cursor, key, &data, DB_NEXT_DUP );
 847                         if ( rc != 0 ) {
 848                                 err = "c_get lo";
 849                                 goto fail;
 850                         }
 851                         BDB_DISK2ID( &nlo, &lo );
 852                         data.data = &nhi;
 853                         rc = cursor->c_get( cursor, key, &data, DB_NEXT_DUP );
 854                         if ( rc != 0 ) {
 855                                 err = "c_get hi";
 856                                 goto fail;
 857                         }
 858                         BDB_DISK2ID( &nhi, &hi );
 859                         if ( id == lo || id == hi ) {
 860                                 if ( id == lo ) {
 861                                         id++;
 862                                         lo = id;
 863                                 } else if ( id == hi ) {
 864                                         id--;
 865                                         hi = id;
 866                                 }
 867                                 if ( lo >= hi ) {
 868                                 /* The range has collapsed... */
 869                                         rc = db->del( db, tid, key, 0 );
 870                                         if ( rc != 0 ) {
 871                                                 err = "del";
 872                                                 goto fail;
 873                                         }
 874                                 } else {
 875                                         if ( id == lo ) {
 876                                                 /* reposition on lo slot */
 877                                                 data.data = &nlo;
 878                                                 cursor->c_get( cursor, key, &data, DB_PREV );
 879                                         }
 880                                         rc = cursor->c_del( cursor, 0 );
 881                                         if ( rc != 0 ) {
 882                                                 err = "c_del";
 883                                                 goto fail;
 884                                         }
 885                                 }
 886                                 if ( lo <= hi ) {
 887                                         BDB_ID2DISK( id, &nid );
 888                                         data.data = &nid;
 889                                         rc = cursor->c_put( cursor, key, &data, DB_KEYFIRST );
 890                                         if ( rc != 0 ) {
 891                                                 err = "c_put lo/hi";
 892                                                 goto fail;
 893                                         }
 894                                 }
 895                         }
 896                 }
 897         } else {
 898                 /* initial c_get failed, nothing was done */
 899 fail:
 900                 if ( rc != DB_NOTFOUND ) {
 901                 Debug( LDAP_DEBUG_ANY, "=> bdb_idl_delete_key: "
 902                         "%s failed: %s (%d)\n", err, db_strerror(rc), rc );
 903                 }
 904                 cursor->c_close( cursor );
 905                 return rc;
 906         }
 907         rc = cursor->c_close( cursor );
 908         if( rc != 0 ) {
 909                 Debug( LDAP_DEBUG_ANY,
 910                         "=> bdb_idl_delete_key: c_close failed: %s (%d)\n",
 911                         db_strerror(rc), rc, 0 );
 912         }
 913
 914         return rc;
 915 }
 916
 917
 918 /*
 919  * idl_intersection - return a = a intersection b
 920  */
 921 int
 922 bdb_idl_intersection(
 923         ID *a,
 924         ID *b )
 925 {
 926         ID ida, idb;
 927         ID idmax, idmin;
 928         ID cursora = 0, cursorb = 0, cursorc;
 929         int swap = 0;
 930
 931         if ( BDB_IDL_IS_ZERO( a ) || BDB_IDL_IS_ZERO( b ) ) {
 932                 a[0] = 0;
 933                 return 0;
 934         }
 935
 936         idmin = IDL_MAX( BDB_IDL_FIRST(a), BDB_IDL_FIRST(b) );
 937         idmax = IDL_MIN( BDB_IDL_LAST(a), BDB_IDL_LAST(b) );
 938         if ( idmin > idmax ) {
 939                 a[0] = 0;
 940                 return 0;
 941         } else if ( idmin == idmax ) {
 942                 a[0] = 1;
 943                 a[1] = idmin;
 944                 return 0;
 945         }
 946
 947         if ( BDB_IDL_IS_RANGE( a ) ) {
 948                 if ( BDB_IDL_IS_RANGE(b) ) {
 949                 /* If both are ranges, just shrink the boundaries */
 950                         a[1] = idmin;
 951                         a[2] = idmax;
 952                         return 0;
 953                 } else {
 954                 /* Else swap so that b is the range, a is a list */
 955                         ID *tmp = a;
 956                         a = b;
 957                         b = tmp;
 958                         swap = 1;
 959                 }
 960         }
 961
 962         /* If a range completely covers the list, the result is
 963          * just the list. If idmin to idmax is contiguous, just
 964          * turn it into a range.
 965          */
 966         if ( BDB_IDL_IS_RANGE( b )
 967                 && BDB_IDL_FIRST( b ) <= BDB_IDL_FIRST( a )
 968                 && BDB_IDL_LAST( b ) >= BDB_IDL_LAST( a ) ) {
 969                 if (idmax - idmin + 1 == a[0])
 970                 {
 971                         a[0] = NOID;
 972                         a[1] = idmin;
 973                         a[2] = idmax;
 974                 }
 975                 goto done;
 976         }
 977
 978         /* Fine, do the intersection one element at a time.
 979          * First advance to idmin in both IDLs.
 980          */
 981         cursora = cursorb = idmin;
 982         ida = bdb_idl_first( a, &cursora );
 983         idb = bdb_idl_first( b, &cursorb );
 984         cursorc = 0;
 985
 986         while( ida <= idmax || idb <= idmax ) {
 987                 if( ida == idb ) {
 988                         a[++cursorc] = ida;
 989                         ida = bdb_idl_next( a, &cursora );
 990                         idb = bdb_idl_next( b, &cursorb );
 991                 } else if ( ida < idb ) {
 992                         ida = bdb_idl_next( a, &cursora );
 993                 } else {
 994                         idb = bdb_idl_next( b, &cursorb );
 995                 }
 996         }
 997         a[0] = cursorc;
 998 done:
 999         if (swap)
1000                 BDB_IDL_CPY( b, a );
1001
1002         return 0;
1003 }
1004
1005
1006 /*
1007  * idl_union - return a = a union b
1008  */
1009 int
1010 bdb_idl_union(
1011         ID      *a,
1012         ID      *b )
1013 {
1014         ID ida, idb;
1015         ID cursora = 0, cursorb = 0, cursorc;
1016
1017         if ( BDB_IDL_IS_ZERO( b ) ) {
1018                 return 0;
1019         }
1020
1021         if ( BDB_IDL_IS_ZERO( a ) ) {
1022                 BDB_IDL_CPY( a, b );
1023                 return 0;
1024         }
1025
1026         if ( BDB_IDL_IS_RANGE( a ) || BDB_IDL_IS_RANGE(b) ) {
1027 over:           ida = IDL_MIN( BDB_IDL_FIRST(a), BDB_IDL_FIRST(b) );
1028                 idb = IDL_MAX( BDB_IDL_LAST(a), BDB_IDL_LAST(b) );
1029                 a[0] = NOID;
1030                 a[1] = ida;
1031                 a[2] = idb;
1032                 return 0;
1033         }
1034
1035         ida = bdb_idl_first( a, &cursora );
1036         idb = bdb_idl_first( b, &cursorb );
1037
1038         cursorc = b[0];
1039
1040         /* The distinct elements of a are cat'd to b */
1041         while( ida != NOID || idb != NOID ) {
1042                 if ( ida < idb ) {
1043                         if( ++cursorc > BDB_IDL_UM_MAX ) {
1044                                 goto over;
1045                         }
1046                         b[cursorc] = ida;
1047                         ida = bdb_idl_next( a, &cursora );
1048
1049                 } else {
1050                         if ( ida == idb )
1051                                 ida = bdb_idl_next( a, &cursora );
1052                         idb = bdb_idl_next( b, &cursorb );
1053                 }
1054         }
1055
1056         /* b is copied back to a in sorted order */
1057         a[0] = cursorc;
1058         cursora = 1;
1059         cursorb = 1;
1060         cursorc = b[0]+1;
1061         while (cursorb <= b[0] || cursorc <= a[0]) {
1062                 if (cursorc > a[0])
1063                         idb = NOID;
1064                 else
1065                         idb = b[cursorc];
1066                 if (cursorb <= b[0] && b[cursorb] < idb)
1067                         a[cursora++] = b[cursorb++];
1068                 else {
1069                         a[cursora++] = idb;
1070                         cursorc++;
1071                 }
1072         }
1073
1074         return 0;
1075 }
1076
1077
1078 #if 0
1079 /*
1080  * bdb_idl_notin - return a intersection ~b (or a minus b)
1081  */
1082 int
1083 bdb_idl_notin(
1084         ID      *a,
1085         ID      *b,
1086         ID *ids )
1087 {
1088         ID ida, idb;
1089         ID cursora = 0, cursorb = 0;
1090
1091         if( BDB_IDL_IS_ZERO( a ) ||
1092                 BDB_IDL_IS_ZERO( b ) ||
1093                 BDB_IDL_IS_RANGE( b ) )
1094         {
1095                 BDB_IDL_CPY( ids, a );
1096                 return 0;
1097         }
1098
1099         if( BDB_IDL_IS_RANGE( a ) ) {
1100                 BDB_IDL_CPY( ids, a );
1101                 return 0;
1102         }
1103
1104         ida = bdb_idl_first( a, &cursora ),
1105         idb = bdb_idl_first( b, &cursorb );
1106
1107         ids[0] = 0;
1108
1109         while( ida != NOID ) {
1110                 if ( idb == NOID ) {
1111                         /* we could shortcut this */
1112                         ids[++ids[0]] = ida;
1113                         ida = bdb_idl_next( a, &cursora );
1114
1115                 } else if ( ida < idb ) {
1116                         ids[++ids[0]] = ida;
1117                         ida = bdb_idl_next( a, &cursora );
1118
1119                 } else if ( ida > idb ) {
1120                         idb = bdb_idl_next( b, &cursorb );
1121
1122                 } else {
1123                         ida = bdb_idl_next( a, &cursora );
1124                         idb = bdb_idl_next( b, &cursorb );
1125                 }
1126         }
1127
1128         return 0;
1129 }
1130 #endif
1131
1132 ID bdb_idl_first( ID *ids, ID *cursor )
1133 {
1134         ID pos;
1135
1136         if ( ids[0] == 0 ) {
1137                 *cursor = NOID;
1138                 return NOID;
1139         }
1140
1141         if ( BDB_IDL_IS_RANGE( ids ) ) {
1142                 if( *cursor < ids[1] ) {
1143                         *cursor = ids[1];
1144                 }
1145                 return *cursor;
1146         }
1147
1148         if ( *cursor == 0 )
1149                 pos = 1;
1150         else
1151                 pos = bdb_idl_search( ids, *cursor );
1152
1153         if( pos > ids[0] ) {
1154                 return NOID;
1155         }
1156
1157         *cursor = pos;
1158         return ids[pos];
1159 }
1160
1161 ID bdb_idl_next( ID *ids, ID *cursor )
1162 {
1163         if ( BDB_IDL_IS_RANGE( ids ) ) {
1164                 if( ids[2] < ++(*cursor) ) {
1165                         return NOID;
1166                 }
1167                 return *cursor;
1168         }
1169
1170         if ( ++(*cursor) <= ids[0] ) {
1171                 return ids[*cursor];
1172         }
1173
1174         return NOID;
1175 }
1176