lib/dbwrap/dbwrap_ntdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Database interface wrapper around ntdb
   4    Copyright (C) Volker Lendecke 2005-2007
   5    Copyright (C) Rusty Russell 2012
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "dbwrap/dbwrap.h"
  23 #include "dbwrap/dbwrap_private.h"
  24 #include "dbwrap/dbwrap_ntdb.h"
  25 #include "system/filesys.h"
  26 #include "lib/util/util_ntdb.h"
  27 #include "ccan/str/str.h"
  28
  29 struct db_ntdb_ctx {
  30         struct ntdb_context *ntdb;
  31
  32         struct {
  33                 dev_t dev;
  34                 ino_t ino;
  35         } id;
  36 };
  37
  38 static int tdb_store_flag_to_ntdb(int tdb_flag)
  39 {
  40         switch (tdb_flag) {
  41         /* In fact, any value defaults to TDB_REPLACE in tdb! */
  42         case 0:
  43         case TDB_REPLACE:
  44                 return NTDB_REPLACE;
  45         case TDB_INSERT:
  46                 return NTDB_INSERT;
  47         case TDB_MODIFY:
  48                 return NTDB_MODIFY;
  49         default:
  50                 smb_panic("unknown tdb_flag");
  51         }
  52 }
  53
  54 static NTSTATUS db_ntdb_store(struct db_record *rec, NTDB_DATA data, int flag)
  55 {
  56         int ntdb_flag = tdb_store_flag_to_ntdb(flag);
  57         struct db_ntdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
  58                                                         struct db_ntdb_ctx);
  59
  60         /*
  61          * This has a bug: We need to replace rec->value for correct
  62          * operation, but right now brlock and locking don't use the value
  63          * anymore after it was stored.
  64          */
  65
  66         if (ntdb_store(ctx->ntdb, rec->key, data, ntdb_flag) == NTDB_SUCCESS) {
  67                 return NT_STATUS_OK;
  68         }
  69         return NT_STATUS_UNSUCCESSFUL;
  70 }
  71
  72 static NTSTATUS db_ntdb_delete(struct db_record *rec)
  73 {
  74         enum NTDB_ERROR err;
  75         struct db_ntdb_ctx *ctx = talloc_get_type_abort(rec->private_data,
  76                                                        struct db_ntdb_ctx);
  77
  78         err = ntdb_delete(ctx->ntdb, rec->key);
  79         if (err == NTDB_SUCCESS) {
  80                 return NT_STATUS_OK;
  81         }
  82
  83         if (err == NTDB_ERR_NOEXIST) {
  84                 return NT_STATUS_NOT_FOUND;
  85         }
  86
  87         return NT_STATUS_UNSUCCESSFUL;
  88 }
  89
  90 static void db_ntdb_log_key(const char *prefix, NTDB_DATA key)
  91 {
  92         size_t len;
  93         char *keystr;
  94
  95         if (DEBUGLEVEL < 10) {
  96                 return;
  97         }
  98         len = key.dsize;
  99         if (DEBUGLEVEL == 10) {
 100                 /*
 101                  * Only fully spam at debuglevel > 10
 102                  */
 103                 len = MIN(10, key.dsize);
 104         }
 105         keystr = hex_encode_talloc(talloc_tos(), (unsigned char *)(key.dptr),
 106                                    len);
 107         DEBUG(10, ("%s key %s\n", prefix, keystr));
 108         TALLOC_FREE(keystr);
 109 }
 110
 111 static int db_ntdb_record_destr(struct db_record* data)
 112 {
 113         struct db_ntdb_ctx *ctx =
 114                 talloc_get_type_abort(data->private_data, struct db_ntdb_ctx);
 115
 116         db_ntdb_log_key("Unlocking", data->key);
 117         ntdb_chainunlock(ctx->ntdb, data->key);
 118         return 0;
 119 }
 120
 121 struct ntdb_fetch_locked_state {
 122         TALLOC_CTX *mem_ctx;
 123         struct db_record *result;
 124 };
 125
 126 static enum NTDB_ERROR db_ntdb_fetchlock_parse(NTDB_DATA key, NTDB_DATA data,
 127                                                struct ntdb_fetch_locked_state *state)
 128 {
 129         struct db_record *result;
 130
 131         result = (struct db_record *)talloc_size(
 132                 state->mem_ctx,
 133                 sizeof(struct db_record) + key.dsize + data.dsize);
 134
 135         if (result == NULL) {
 136                 return NTDB_ERR_OOM;
 137         }
 138         state->result = result;
 139
 140         result->key.dsize = key.dsize;
 141         result->key.dptr = ((uint8_t *)result) + sizeof(struct db_record);
 142         memcpy(result->key.dptr, key.dptr, key.dsize);
 143
 144         result->value.dsize = data.dsize;
 145
 146         if (data.dsize > 0) {
 147                 result->value.dptr = result->key.dptr+key.dsize;
 148                 memcpy(result->value.dptr, data.dptr, data.dsize);
 149         }
 150         else {
 151                 result->value.dptr = NULL;
 152         }
 153
 154         return NTDB_SUCCESS;
 155 }
 156
 157 static struct db_record *db_ntdb_fetch_locked_internal(
 158         struct db_context *db, TALLOC_CTX *mem_ctx, NTDB_DATA key)
 159 {
 160         struct db_ntdb_ctx *ctx = talloc_get_type_abort(db->private_data,
 161                                                         struct db_ntdb_ctx);
 162         struct ntdb_fetch_locked_state state;
 163         enum NTDB_ERROR err;
 164         NTDB_DATA null = { NULL, 0 };
 165
 166         state.mem_ctx = mem_ctx;
 167         state.result = NULL;
 168
 169         err = ntdb_parse_record(ctx->ntdb, key, db_ntdb_fetchlock_parse,
 170                                 &state);
 171         if (err != NTDB_SUCCESS && err != NTDB_ERR_NOEXIST) {
 172                 ntdb_chainunlock(ctx->ntdb, key);
 173                 return NULL;
 174         }
 175
 176         if (state.result == NULL) {
 177                 db_ntdb_fetchlock_parse(key, null, &state);
 178         }
 179
 180         if (state.result == NULL) {
 181                 ntdb_chainunlock(ctx->ntdb, key);
 182                 return NULL;
 183         }
 184
 185         talloc_set_destructor(state.result, db_ntdb_record_destr);
 186
 187         state.result->private_data = talloc_reference(state.result, ctx);
 188         state.result->store = db_ntdb_store;
 189         state.result->delete_rec = db_ntdb_delete;
 190
 191         DEBUG(10, ("Allocated locked data 0x%p\n", state.result));
 192
 193         return state.result;
 194 }
 195
 196 static struct db_record *db_ntdb_fetch_locked(
 197         struct db_context *db, TALLOC_CTX *mem_ctx, NTDB_DATA key)
 198 {
 199         struct db_ntdb_ctx *ctx = talloc_get_type_abort(db->private_data,
 200                                                        struct db_ntdb_ctx);
 201
 202         db_ntdb_log_key("Locking", key);
 203         if (ntdb_chainlock(ctx->ntdb, key) != 0) {
 204                 DEBUG(3, ("ntdb_chainlock failed\n"));
 205                 return NULL;
 206         }
 207         return db_ntdb_fetch_locked_internal(db, mem_ctx, key);
 208 }
 209
 210 /* Proxy which sets waitflag to false so we never block. */
 211 static int lock_nonblock(int fd, int rw, off_t off, off_t len, bool waitflag,
 212                          void *_orig)
 213 {
 214         struct ntdb_attribute_flock *orig = _orig;
 215
 216         return orig->lock(fd, rw, off, len, false, orig->data);
 217 }
 218
 219 static enum NTDB_ERROR enable_nonblock(struct ntdb_context *ntdb,
 220                                        union ntdb_attribute *orig)
 221 {
 222         union ntdb_attribute locking;
 223         enum NTDB_ERROR ecode;
 224
 225         orig->base.attr = NTDB_ATTRIBUTE_FLOCK;
 226         ecode = ntdb_get_attribute(ntdb, orig);
 227         if (ecode != NTDB_SUCCESS) {
 228                 return ecode;
 229         }
 230
 231         /* Replace locking function with our own. */
 232         locking = *orig;
 233         locking.flock.data = orig;
 234         locking.flock.lock = lock_nonblock;
 235
 236         return ntdb_set_attribute(ntdb, &locking);
 237 }
 238
 239 static void disable_nonblock(struct ntdb_context *ntdb)
 240 {
 241         ntdb_unset_attribute(ntdb, NTDB_ATTRIBUTE_FLOCK);
 242 }
 243
 244 static enum NTDB_ERROR ntdb_chainlock_nonblock(struct ntdb_context *ntdb,
 245                                                NTDB_DATA key)
 246 {
 247         union ntdb_attribute orig;
 248         enum NTDB_ERROR ecode;
 249
 250         ecode = enable_nonblock(ntdb, &orig);
 251         if (!ecode) {
 252                 ecode = ntdb_chainlock(ntdb, key);
 253                 disable_nonblock(ntdb);
 254         }
 255         return ecode;
 256 }
 257
 258 static struct db_record *db_ntdb_try_fetch_locked(
 259         struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key)
 260 {
 261         struct db_ntdb_ctx *ctx = talloc_get_type_abort(db->private_data,
 262                                                        struct db_ntdb_ctx);
 263
 264         db_ntdb_log_key("Trying to lock", key);
 265         if (ntdb_chainlock_nonblock(ctx->ntdb, key) != 0) {
 266                 DEBUG(3, ("ntdb_chainlock_nonblock failed\n"));
 267                 return NULL;
 268         }
 269         return db_ntdb_fetch_locked_internal(db, mem_ctx, key);
 270 }
 271
 272 static struct flock flock_struct;
 273
 274 /* Return a value which is none of v1, v2 or v3. */
 275 static inline short int invalid_value(short int v1, short int v2, short int v3)
 276 {
 277         short int try = (v1+v2+v3)^((v1+v2+v3) << 16);
 278         while (try == v1 || try == v2 || try == v3)
 279                 try++;
 280         return try;
 281 }
 282
 283 /* We invalidate in as many ways as we can, so the OS rejects it */
 284 static void invalidate_flock_struct(int signum)
 285 {
 286         flock_struct.l_type = invalid_value(F_RDLCK, F_WRLCK, F_UNLCK);
 287         flock_struct.l_whence = invalid_value(SEEK_SET, SEEK_CUR, SEEK_END);
 288         flock_struct.l_start = -1;
 289         /* A large negative. */
 290         flock_struct.l_len = (((off_t)1 << (sizeof(off_t)*CHAR_BIT - 1)) + 1);
 291 }
 292
 293 static int timeout_lock(int fd, int rw, off_t off, off_t len, bool waitflag,
 294                         void *_timeout)
 295 {
 296         int ret, saved_errno;
 297         unsigned int timeout = *(unsigned int *)_timeout;
 298
 299         flock_struct.l_type = rw;
 300         flock_struct.l_whence = SEEK_SET;
 301         flock_struct.l_start = off;
 302         flock_struct.l_len = len;
 303
 304         CatchSignal(SIGALRM, invalidate_flock_struct);
 305         alarm(timeout);
 306
 307         for (;;) {
 308                 if (waitflag)
 309                         ret = fcntl(fd, F_SETLKW, &flock_struct);
 310                 else
 311                         ret = fcntl(fd, F_SETLK, &flock_struct);
 312
 313                 if (ret == 0)
 314                         break;
 315
 316                 /* Not signalled?  Something else went wrong. */
 317                 if (flock_struct.l_len == len) {
 318                         if (errno == EAGAIN || errno == EINTR)
 319                                 continue;
 320                         saved_errno = errno;
 321                         break;
 322                 } else {
 323                         saved_errno = EINTR;
 324                         break;
 325                 }
 326         }
 327
 328         alarm(0);
 329         errno = saved_errno;
 330         return ret;
 331 }
 332
 333 static int ntdb_chainlock_timeout(struct ntdb_context *ntdb,
 334                                   NTDB_DATA key,
 335                                   unsigned int timeout)
 336 {
 337         union ntdb_attribute locking;
 338         enum NTDB_ERROR ecode;
 339
 340         locking.base.attr = NTDB_ATTRIBUTE_FLOCK;
 341         ecode = ntdb_get_attribute(ntdb, &locking);
 342         if (ecode != NTDB_SUCCESS) {
 343                 return -1;
 344         }
 345
 346         /* Replace locking function with our own. */
 347         locking.flock.data = &timeout;
 348         locking.flock.lock = timeout_lock;
 349
 350         ecode = ntdb_set_attribute(ntdb, &locking);
 351         if (ecode != NTDB_SUCCESS) {
 352                 return -1;
 353         }
 354
 355         ecode = ntdb_chainlock(ntdb, key);
 356
 357         ntdb_unset_attribute(ntdb, NTDB_ATTRIBUTE_FLOCK);
 358         return ecode == NTDB_SUCCESS ? 0 : -1;
 359 }
 360
 361 static struct db_record *db_ntdb_fetch_locked_timeout(
 362         struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key,
 363         unsigned int timeout)
 364 {
 365         struct db_ntdb_ctx *ctx = talloc_get_type_abort(db->private_data,
 366                                                        struct db_ntdb_ctx);
 367
 368         db_ntdb_log_key("Trying to lock", key);
 369         if (ntdb_chainlock_timeout(ctx->ntdb, key, timeout) != 0) {
 370                 DEBUG(3, ("ntdb_chainlock_timeout failed\n"));
 371                 return NULL;
 372         }
 373         return db_ntdb_fetch_locked_internal(db, mem_ctx, key);
 374 }
 375
 376
 377 static int db_ntdb_exists(struct db_context *db, TDB_DATA key)
 378 {
 379         struct db_ntdb_ctx *ctx = talloc_get_type_abort(
 380                 db->private_data, struct db_ntdb_ctx);
 381         return ntdb_exists(ctx->ntdb, key);
 382 }
 383
 384 static int db_ntdb_wipe(struct db_context *db)
 385 {
 386         struct db_ntdb_ctx *ctx = talloc_get_type_abort(
 387                 db->private_data, struct db_ntdb_ctx);
 388         if (ntdb_wipe_all(ctx->ntdb) != NTDB_SUCCESS) {
 389                 return -1;
 390         }
 391         return 0;
 392 }
 393
 394 static int db_ntdb_check(struct db_context *db)
 395 {
 396         struct db_ntdb_ctx *ctx = talloc_get_type_abort(
 397                 db->private_data, struct db_ntdb_ctx);
 398         if (ntdb_check(ctx->ntdb, NULL, NULL) != NTDB_SUCCESS) {
 399                 return -1;
 400         }
 401         return 0;
 402 }
 403
 404 struct db_ntdb_parse_state {
 405         void (*parser)(TDB_DATA key, TDB_DATA data,
 406                        void *private_data);
 407         void *private_data;
 408 };
 409
 410 /*
 411  * ntdb_parse_record expects a parser returning enum NTDB_ERROR,
 412  * mixing up ntdb and parser errors. Wrap around that by always
 413  * returning NTDB_SUCCESS and have dbwrap_parse_record expect a parser
 414  * returning void.
 415  */
 416
 417 static enum NTDB_ERROR db_ntdb_parser(NTDB_DATA key, NTDB_DATA data,
 418                                       struct db_ntdb_parse_state *state)
 419 {
 420         state->parser(key, data, state->private_data);
 421         return TDB_SUCCESS;
 422 }
 423
 424 static NTSTATUS db_ntdb_parse(struct db_context *db, TDB_DATA key,
 425                               void (*parser)(TDB_DATA key, TDB_DATA data,
 426                                              void *private_data),
 427                               void *private_data)
 428 {
 429         struct db_ntdb_ctx *ctx = talloc_get_type_abort(
 430                 db->private_data, struct db_ntdb_ctx);
 431         struct db_ntdb_parse_state state;
 432         enum NTDB_ERROR err;
 433
 434         state.parser = parser;
 435         state.private_data = private_data;
 436
 437         err = ntdb_parse_record(ctx->ntdb, key, db_ntdb_parser, &state);
 438         return map_nt_error_from_ntdb(err);
 439 }
 440
 441 struct db_ntdb_traverse_ctx {
 442         struct db_context *db;
 443         int (*f)(struct db_record *rec, void *private_data);
 444         void *private_data;
 445 };
 446
 447 static int db_ntdb_traverse_func(struct ntdb_context *ntdb,
 448                                  NTDB_DATA kbuf, NTDB_DATA dbuf,
 449                                  struct db_ntdb_traverse_ctx *ctx)
 450 {
 451         struct db_record rec;
 452
 453         rec.key = kbuf;
 454         rec.value = dbuf;
 455         rec.store = db_ntdb_store;
 456         rec.delete_rec = db_ntdb_delete;
 457         rec.private_data = ctx->db->private_data;
 458         rec.db = ctx->db;
 459
 460         return ctx->f(&rec, ctx->private_data);
 461 }
 462
 463 static int db_ntdb_traverse(struct db_context *db,
 464                             int (*f)(struct db_record *rec, void *private_data),
 465                             void *private_data)
 466 {
 467         struct db_ntdb_ctx *db_ctx =
 468                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 469         struct db_ntdb_traverse_ctx ctx;
 470         int64_t ret;
 471
 472         ctx.db = db;
 473         ctx.f = f;
 474         ctx.private_data = private_data;
 475         ret = ntdb_traverse(db_ctx->ntdb, db_ntdb_traverse_func, &ctx);
 476
 477         if (ret < 0) {
 478                 return -1;
 479         }
 480
 481         /* Make sure we don't truncate! */
 482         if ((int)ret != ret) {
 483                 ret = INT_MAX;
 484         }
 485         return ret;
 486 }
 487
 488 static NTSTATUS db_ntdb_store_deny(struct db_record *rec, NTDB_DATA data, int flag)
 489 {
 490         return NT_STATUS_MEDIA_WRITE_PROTECTED;
 491 }
 492
 493 static NTSTATUS db_ntdb_delete_deny(struct db_record *rec)
 494 {
 495         return NT_STATUS_MEDIA_WRITE_PROTECTED;
 496 }
 497
 498 static int db_ntdb_traverse_read_func(struct ntdb_context *ntdb,
 499                                       NTDB_DATA kbuf, NTDB_DATA dbuf,
 500                                       struct db_ntdb_traverse_ctx *ctx)
 501 {
 502         struct db_record rec;
 503
 504         rec.key = kbuf;
 505         rec.value = dbuf;
 506         rec.store = db_ntdb_store_deny;
 507         rec.delete_rec = db_ntdb_delete_deny;
 508         rec.private_data = ctx->db->private_data;
 509         rec.db = ctx->db;
 510
 511         return ctx->f(&rec, ctx->private_data);
 512 }
 513
 514 static int db_ntdb_traverse_read(struct db_context *db,
 515                                  int (*f)(struct db_record *rec,
 516                                           void *private_data),
 517                                  void *private_data)
 518 {
 519         struct db_ntdb_ctx *db_ctx =
 520                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 521         struct db_ntdb_traverse_ctx ctx;
 522         int64_t ret;
 523
 524         ctx.db = db;
 525         ctx.f = f;
 526         ctx.private_data = private_data;
 527
 528         /* This is a bit of paranoia to check that f() isn't altering
 529          * database. */
 530         if (ntdb_get_flags(db_ctx->ntdb) & NTDB_RDONLY) {
 531                 ret = ntdb_traverse(db_ctx->ntdb, db_ntdb_traverse_read_func,
 532                                     &ctx);
 533         } else {
 534                 ntdb_add_flag(db_ctx->ntdb, NTDB_RDONLY);
 535                 ret = ntdb_traverse(db_ctx->ntdb, db_ntdb_traverse_read_func,
 536                                     &ctx);
 537                 ntdb_remove_flag(db_ctx->ntdb, NTDB_RDONLY);
 538         }
 539
 540         if (ret < 0) {
 541                 return -1;
 542         }
 543
 544         /* Make sure we don't truncate! */
 545         if ((int)ret != ret) {
 546                 ret = INT_MAX;
 547         }
 548         return ret;
 549 }
 550
 551 static int db_ntdb_get_seqnum(struct db_context *db)
 552
 553 {
 554         struct db_ntdb_ctx *db_ctx =
 555                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 556         return ntdb_get_seqnum(db_ctx->ntdb);
 557 }
 558
 559 static int db_ntdb_transaction_start(struct db_context *db)
 560 {
 561         struct db_ntdb_ctx *db_ctx =
 562                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 563         return ntdb_transaction_start(db_ctx->ntdb) == NTDB_SUCCESS ? 0 : -1;
 564 }
 565
 566 static NTSTATUS db_ntdb_transaction_start_nonblock(struct db_context *db)
 567 {
 568         union ntdb_attribute orig;
 569         enum NTDB_ERROR ecode;
 570         struct db_ntdb_ctx *db_ctx =
 571                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 572
 573         ecode = enable_nonblock(db_ctx->ntdb, &orig);
 574         if (!ecode) {
 575                 ecode = ntdb_transaction_start(db_ctx->ntdb);
 576                 disable_nonblock(db_ctx->ntdb);
 577         }
 578         return map_nt_error_from_ntdb(ecode);
 579 }
 580
 581 static int db_ntdb_transaction_commit(struct db_context *db)
 582 {
 583         struct db_ntdb_ctx *db_ctx =
 584                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 585         return ntdb_transaction_commit(db_ctx->ntdb) == NTDB_SUCCESS ? 0 : -1;
 586 }
 587
 588 static int db_ntdb_transaction_cancel(struct db_context *db)
 589 {
 590         struct db_ntdb_ctx *db_ctx =
 591                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 592         ntdb_transaction_cancel(db_ctx->ntdb);
 593         return 0;
 594 }
 595
 596 static void db_ntdb_id(struct db_context *db, const uint8_t **id, size_t *idlen)
 597 {
 598         struct db_ntdb_ctx *db_ctx =
 599                 talloc_get_type_abort(db->private_data, struct db_ntdb_ctx);
 600         *id = (uint8_t *)&db_ctx->id;
 601         *idlen = sizeof(db_ctx->id);
 602 }
 603
 604 /* Don't ask this to open a .tdb file: dbwrap_local_open will catch that. */
 605 struct db_context *db_open_ntdb(TALLOC_CTX *mem_ctx,
 606                                 struct loadparm_context *lp_ctx,
 607                                 const char *ntdbname,
 608                                 int hash_size, int ntdb_flags,
 609                                 int open_flags, mode_t mode,
 610                                 enum dbwrap_lock_order lock_order)
 611 {
 612         struct db_context *result = NULL;
 613         struct db_ntdb_ctx *db_ntdb;
 614         struct stat st;
 615         union ntdb_attribute hattr;
 616
 617         if ((ntdb_flags & NTDB_INTERNAL) && !ntdbname) {
 618                 ntdbname = "unnamed";
 619         }
 620
 621         /* Extra paranoia. */
 622         if (strends(ntdbname, ".tdb")) {
 623                 DEBUG(0, ("can't try to open %s with ntdb!", ntdbname));
 624                 return NULL;
 625         }
 626
 627         /* We only use this if hsize is non-zero. */
 628         hattr.base.attr = NTDB_ATTRIBUTE_HASHSIZE;
 629         hattr.base.next = NULL;
 630         hattr.hashsize.size = hash_size;
 631
 632         result = talloc_zero(mem_ctx, struct db_context);
 633         if (result == NULL) {
 634                 DEBUG(0, ("talloc failed\n"));
 635                 goto fail;
 636         }
 637
 638         result->private_data = db_ntdb = talloc(result, struct db_ntdb_ctx);
 639         if (db_ntdb == NULL) {
 640                 DEBUG(0, ("talloc failed\n"));
 641                 goto fail;
 642         }
 643         result->lock_order = lock_order;
 644
 645         db_ntdb->ntdb = ntdb_new(db_ntdb, ntdbname, ntdb_flags,
 646                                  open_flags, mode,
 647                                  hash_size ? &hattr : NULL, lp_ctx);
 648         if (db_ntdb->ntdb == NULL) {
 649                 DEBUG(3, ("Could not open ntdb %s: %s\n",
 650                           ntdbname, strerror(errno)));
 651                 goto fail;
 652         }
 653
 654         ZERO_STRUCT(db_ntdb->id);
 655
 656         if (fstat(ntdb_fd(db_ntdb->ntdb), &st) == -1) {
 657                 DEBUG(3, ("fstat failed: %s\n", strerror(errno)));
 658                 goto fail;
 659         }
 660         db_ntdb->id.dev = st.st_dev;
 661         db_ntdb->id.ino = st.st_ino;
 662
 663         result->fetch_locked = db_ntdb_fetch_locked;
 664         result->fetch_locked_timeout = db_ntdb_fetch_locked_timeout;
 665         result->try_fetch_locked = db_ntdb_try_fetch_locked;
 666         result->traverse = db_ntdb_traverse;
 667         result->traverse_read = db_ntdb_traverse_read;
 668         result->parse_record = db_ntdb_parse;
 669         result->get_seqnum = db_ntdb_get_seqnum;
 670         result->persistent = ((ntdb_flags & NTDB_CLEAR_IF_FIRST) == 0);
 671         result->transaction_start = db_ntdb_transaction_start;
 672         result->transaction_start_nonblock = db_ntdb_transaction_start_nonblock;
 673         result->transaction_commit = db_ntdb_transaction_commit;
 674         result->transaction_cancel = db_ntdb_transaction_cancel;
 675         result->exists = db_ntdb_exists;
 676         result->wipe = db_ntdb_wipe;
 677         result->id = db_ntdb_id;
 678         result->check = db_ntdb_check;
 679         result->stored_callback = NULL;
 680         result->name = ntdb_name(db_ntdb->ntdb);
 681         result->hash_size = hash_size;
 682         return result;
 683
 684  fail:
 685         if (result != NULL) {
 686                 TALLOC_FREE(result);
 687         }
 688         return NULL;
 689 }