git.ozlabs.org Git - ccan/blob - ccan/tdb2/open.c

   1 #include "private.h"
   2 #include <ccan/hash/hash.h>
   3 #include <assert.h>
   4
   5 /* all lock info, to detect double-opens (fcntl file don't nest!) */
   6 static struct tdb_file *files = NULL;
   7
   8 static struct tdb_file *find_file(dev_t device, ino_t ino)
   9 {
  10         struct tdb_file *i;
  11
  12         for (i = files; i; i = i->next) {
  13                 if (i->device == device && i->inode == ino) {
  14                         i->refcnt++;
  15                         break;
  16                 }
  17         }
  18         return i;
  19 }
  20
  21 static bool read_all(int fd, void *buf, size_t len)
  22 {
  23         while (len) {
  24                 ssize_t ret;
  25                 ret = read(fd, buf, len);
  26                 if (ret < 0)
  27                         return false;
  28                 if (ret == 0) {
  29                         /* ETOOSHORT? */
  30                         errno = EWOULDBLOCK;
  31                         return false;
  32                 }
  33                 buf = (char *)buf + ret;
  34                 len -= ret;
  35         }
  36         return true;
  37 }
  38
  39 static uint64_t random_number(struct tdb_context *tdb)
  40 {
  41         int fd;
  42         uint64_t ret = 0;
  43         struct timeval now;
  44
  45         fd = open("/dev/urandom", O_RDONLY);
  46         if (fd >= 0) {
  47                 if (read_all(fd, &ret, sizeof(ret))) {
  48                         close(fd);
  49                         return ret;
  50                 }
  51                 close(fd);
  52         }
  53         /* FIXME: Untested!  Based on Wikipedia protocol description! */
  54         fd = open("/dev/egd-pool", O_RDWR);
  55         if (fd >= 0) {
  56                 /* Command is 1, next byte is size we want to read. */
  57                 char cmd[2] = { 1, sizeof(uint64_t) };
  58                 if (write(fd, cmd, sizeof(cmd)) == sizeof(cmd)) {
  59                         char reply[1 + sizeof(uint64_t)];
  60                         int r = read(fd, reply, sizeof(reply));
  61                         if (r > 1) {
  62                                 /* Copy at least some bytes. */
  63                                 memcpy(&ret, reply+1, r - 1);
  64                                 if (reply[0] == sizeof(uint64_t)
  65                                     && r == sizeof(reply)) {
  66                                         close(fd);
  67                                         return ret;
  68                                 }
  69                         }
  70                 }
  71                 close(fd);
  72         }
  73
  74         /* Fallback: pid and time. */
  75         gettimeofday(&now, NULL);
  76         ret = getpid() * 100132289ULL + now.tv_sec * 1000000ULL + now.tv_usec;
  77         tdb_logerr(tdb, TDB_SUCCESS, TDB_LOG_WARNING,
  78                    "tdb_open: random from getpid and time");
  79         return ret;
  80 }
  81
  82 struct new_database {
  83         struct tdb_header hdr;
  84         struct tdb_freetable ftable;
  85 };
  86
  87 /* initialise a new database */
  88 static enum TDB_ERROR tdb_new_database(struct tdb_context *tdb,
  89                                        struct tdb_attribute_seed *seed,
  90                                        struct tdb_header *hdr)
  91 {
  92         /* We make it up in memory, then write it out if not internal */
  93         struct new_database newdb;
  94         unsigned int magic_len;
  95         ssize_t rlen;
  96         enum TDB_ERROR ecode;
  97
  98         /* Fill in the header */
  99         newdb.hdr.version = TDB_VERSION;
 100         if (seed)
 101                 newdb.hdr.hash_seed = seed->seed;
 102         else
 103                 newdb.hdr.hash_seed = random_number(tdb);
 104         newdb.hdr.hash_test = TDB_HASH_MAGIC;
 105         newdb.hdr.hash_test = tdb->hash_fn(&newdb.hdr.hash_test,
 106                                            sizeof(newdb.hdr.hash_test),
 107                                            newdb.hdr.hash_seed,
 108                                            tdb->hash_data);
 109         newdb.hdr.recovery = 0;
 110         newdb.hdr.features_used = newdb.hdr.features_offered = TDB_FEATURE_MASK;
 111         newdb.hdr.seqnum = 0;
 112         memset(newdb.hdr.reserved, 0, sizeof(newdb.hdr.reserved));
 113         /* Initial hashes are empty. */
 114         memset(newdb.hdr.hashtable, 0, sizeof(newdb.hdr.hashtable));
 115
 116         /* Free is empty. */
 117         newdb.hdr.free_table = offsetof(struct new_database, ftable);
 118         memset(&newdb.ftable, 0, sizeof(newdb.ftable));
 119         ecode = set_header(NULL, &newdb.ftable.hdr, TDB_FTABLE_MAGIC, 0,
 120                            sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
 121                            sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
 122                            0);
 123         if (ecode != TDB_SUCCESS) {
 124                 return ecode;
 125         }
 126
 127         /* Magic food */
 128         memset(newdb.hdr.magic_food, 0, sizeof(newdb.hdr.magic_food));
 129         strcpy(newdb.hdr.magic_food, TDB_MAGIC_FOOD);
 130
 131         /* This creates an endian-converted database, as if read from disk */
 132         magic_len = sizeof(newdb.hdr.magic_food);
 133         tdb_convert(tdb,
 134                     (char *)&newdb.hdr + magic_len, sizeof(newdb) - magic_len);
 135
 136         *hdr = newdb.hdr;
 137
 138         if (tdb->flags & TDB_INTERNAL) {
 139                 tdb->file->map_size = sizeof(newdb);
 140                 tdb->file->map_ptr = malloc(tdb->file->map_size);
 141                 if (!tdb->file->map_ptr) {
 142                         return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
 143                                           "tdb_new_database:"
 144                                           " failed to allocate");
 145                 }
 146                 memcpy(tdb->file->map_ptr, &newdb, tdb->file->map_size);
 147                 return TDB_SUCCESS;
 148         }
 149         if (lseek(tdb->file->fd, 0, SEEK_SET) == -1) {
 150                 return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
 151                                   "tdb_new_database:"
 152                                   " failed to seek: %s", strerror(errno));
 153         }
 154
 155         if (ftruncate(tdb->file->fd, 0) == -1) {
 156                 return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
 157                                   "tdb_new_database:"
 158                                   " failed to truncate: %s", strerror(errno));
 159         }
 160
 161         rlen = write(tdb->file->fd, &newdb, sizeof(newdb));
 162         if (rlen != sizeof(newdb)) {
 163                 if (rlen >= 0)
 164                         errno = ENOSPC;
 165                 return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
 166                                   "tdb_new_database: %zi writing header: %s",
 167                                   rlen, strerror(errno));
 168         }
 169         return TDB_SUCCESS;
 170 }
 171
 172 static enum TDB_ERROR tdb_new_file(struct tdb_context *tdb)
 173 {
 174         tdb->file = malloc(sizeof(*tdb->file));
 175         if (!tdb->file)
 176                 return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
 177                                   "tdb_open: cannot alloc tdb_file structure");
 178         tdb->file->num_lockrecs = 0;
 179         tdb->file->lockrecs = NULL;
 180         tdb->file->allrecord_lock.count = 0;
 181         tdb->file->refcnt = 1;
 182         return TDB_SUCCESS;
 183 }
 184
 185 enum TDB_ERROR tdb_set_attribute(struct tdb_context *tdb,
 186                                  const union tdb_attribute *attr)
 187 {
 188         switch (attr->base.attr) {
 189         case TDB_ATTRIBUTE_LOG:
 190                 tdb->log_fn = attr->log.fn;
 191                 tdb->log_data = attr->log.data;
 192                 break;
 193         case TDB_ATTRIBUTE_HASH:
 194         case TDB_ATTRIBUTE_SEED:
 195         case TDB_ATTRIBUTE_OPENHOOK:
 196                 return tdb->last_error
 197                         = tdb_logerr(tdb, TDB_ERR_EINVAL,
 198                                      TDB_LOG_USE_ERROR,
 199                                      "tdb_set_attribute:"
 200                                      " cannot set %s after opening",
 201                                      attr->base.attr == TDB_ATTRIBUTE_HASH
 202                                      ? "TDB_ATTRIBUTE_HASH"
 203                                      : attr->base.attr == TDB_ATTRIBUTE_SEED
 204                                      ? "TDB_ATTRIBUTE_SEED"
 205                                      : "TDB_ATTRIBUTE_OPENHOOK");
 206         case TDB_ATTRIBUTE_FLOCK:
 207                 tdb->lock_fn = attr->flock.lock;
 208                 tdb->unlock_fn = attr->flock.unlock;
 209                 tdb->lock_data = attr->flock.data;
 210                 break;
 211         default:
 212                 return tdb->last_error
 213                         = tdb_logerr(tdb, TDB_ERR_EINVAL,
 214                                      TDB_LOG_USE_ERROR,
 215                                      "tdb_set_attribute:"
 216                                      " unknown attribute type %u",
 217                                      attr->base.attr);
 218         }
 219         return TDB_SUCCESS;
 220 }
 221
 222 static uint64_t jenkins_hash(const void *key, size_t length, uint64_t seed,
 223                              void *unused)
 224 {
 225         uint64_t ret;
 226         /* hash64_stable assumes lower bits are more important; they are a
 227          * slightly better hash.  We use the upper bits first, so swap them. */
 228         ret = hash64_stable((const unsigned char *)key, length, seed);
 229         return (ret >> 32) | (ret << 32);
 230 }
 231
 232 enum TDB_ERROR tdb_get_attribute(struct tdb_context *tdb,
 233                                  union tdb_attribute *attr)
 234 {
 235         switch (attr->base.attr) {
 236         case TDB_ATTRIBUTE_LOG:
 237                 if (!tdb->log_fn)
 238                         return tdb->last_error = TDB_ERR_NOEXIST;
 239                 attr->log.fn = tdb->log_fn;
 240                 attr->log.data = tdb->log_data;
 241                 break;
 242         case TDB_ATTRIBUTE_HASH:
 243                 attr->hash.fn = tdb->hash_fn;
 244                 attr->hash.data = tdb->hash_data;
 245                 break;
 246         case TDB_ATTRIBUTE_SEED:
 247                 attr->seed.seed = tdb->hash_seed;
 248                 break;
 249         case TDB_ATTRIBUTE_OPENHOOK:
 250                 return tdb->last_error
 251                         = tdb_logerr(tdb, TDB_ERR_EINVAL,
 252                                      TDB_LOG_USE_ERROR,
 253                                      "tdb_get_attribute:"
 254                                      " cannot get TDB_ATTRIBUTE_OPENHOOK");
 255         case TDB_ATTRIBUTE_STATS:
 256                 /* FIXME */
 257                 return TDB_ERR_EINVAL;
 258         case TDB_ATTRIBUTE_FLOCK:
 259                 attr->flock.lock = tdb->lock_fn;
 260                 attr->flock.unlock = tdb->unlock_fn;
 261                 attr->flock.data = tdb->lock_data;
 262                 break;
 263         default:
 264                 return tdb->last_error
 265                         = tdb_logerr(tdb, TDB_ERR_EINVAL,
 266                                      TDB_LOG_USE_ERROR,
 267                                      "tdb_get_attribute:"
 268                                      " unknown attribute type %u",
 269                                      attr->base.attr);
 270         }
 271         attr->base.next = NULL;
 272         return TDB_SUCCESS;
 273 }
 274
 275 void tdb_unset_attribute(struct tdb_context *tdb,
 276                          enum tdb_attribute_type type)
 277 {
 278         switch (type) {
 279         case TDB_ATTRIBUTE_LOG:
 280                 tdb->log_fn = NULL;
 281                 break;
 282         case TDB_ATTRIBUTE_HASH:
 283         case TDB_ATTRIBUTE_SEED:
 284         case TDB_ATTRIBUTE_OPENHOOK:
 285                 tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
 286                            "tdb_unset_attribute: cannot unset %s after opening",
 287                            type == TDB_ATTRIBUTE_HASH
 288                            ? "TDB_ATTRIBUTE_HASH"
 289                            : type == TDB_ATTRIBUTE_SEED
 290                            ? "TDB_ATTRIBUTE_SEED"
 291                            : "TDB_ATTRIBUTE_OPENHOOK");
 292                 break;
 293         case TDB_ATTRIBUTE_STATS:
 294                 /* FIXME */
 295                 break;
 296         case TDB_ATTRIBUTE_FLOCK:
 297                 tdb->lock_fn = tdb_fcntl_lock;
 298                 tdb->unlock_fn = tdb_fcntl_unlock;
 299                 break;
 300         default:
 301                 tdb_logerr(tdb, TDB_ERR_EINVAL,
 302                            TDB_LOG_USE_ERROR,
 303                            "tdb_unset_attribute: unknown attribute type %u",
 304                            type);
 305         }
 306 }
 307
 308 struct tdb_context *tdb_open(const char *name, int tdb_flags,
 309                              int open_flags, mode_t mode,
 310                              union tdb_attribute *attr)
 311 {
 312         struct tdb_context *tdb;
 313         struct stat st;
 314         int saved_errno = 0;
 315         uint64_t hash_test;
 316         unsigned v;
 317         ssize_t rlen;
 318         struct tdb_header hdr;
 319         struct tdb_attribute_seed *seed = NULL;
 320         struct tdb_attribute_openhook *openhook = NULL;
 321         tdb_bool_err berr;
 322         enum TDB_ERROR ecode;
 323
 324         tdb = malloc(sizeof(*tdb));
 325         if (!tdb) {
 326                 /* Can't log this */
 327                 errno = ENOMEM;
 328                 return NULL;
 329         }
 330         tdb->name = NULL;
 331         tdb->direct_access = 0;
 332         tdb->flags = tdb_flags;
 333         tdb->log_fn = NULL;
 334         tdb->transaction = NULL;
 335         tdb->stats = NULL;
 336         tdb->access = NULL;
 337         tdb->last_error = TDB_SUCCESS;
 338         tdb->file = NULL;
 339         tdb->lock_fn = tdb_fcntl_lock;
 340         tdb->unlock_fn = tdb_fcntl_unlock;
 341         tdb->hash_fn = jenkins_hash;
 342         tdb_io_init(tdb);
 343
 344         while (attr) {
 345                 switch (attr->base.attr) {
 346                 case TDB_ATTRIBUTE_HASH:
 347                         tdb->hash_fn = attr->hash.fn;
 348                         tdb->hash_data = attr->hash.data;
 349                         break;
 350                 case TDB_ATTRIBUTE_SEED:
 351                         seed = &attr->seed;
 352                         break;
 353                 case TDB_ATTRIBUTE_STATS:
 354                         tdb->stats = &attr->stats;
 355                         /* They have stats we don't know about?  Tell them. */
 356                         if (tdb->stats->size > sizeof(attr->stats))
 357                                 tdb->stats->size = sizeof(attr->stats);
 358                         break;
 359                 case TDB_ATTRIBUTE_OPENHOOK:
 360                         openhook = &attr->openhook;
 361                         break;
 362                 default:
 363                         /* These are set as normal. */
 364                         ecode = tdb_set_attribute(tdb, attr);
 365                         if (ecode != TDB_SUCCESS)
 366                                 goto fail;
 367                 }
 368                 attr = attr->base.next;
 369         }
 370
 371         if (tdb_flags & ~(TDB_INTERNAL | TDB_NOLOCK | TDB_NOMMAP | TDB_CONVERT
 372                           | TDB_NOSYNC | TDB_SEQNUM)) {
 373                 ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
 374                                    "tdb_open: unknown flags %u", tdb_flags);
 375                 goto fail;
 376         }
 377
 378         if ((open_flags & O_ACCMODE) == O_WRONLY) {
 379                 ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
 380                                    "tdb_open: can't open tdb %s write-only",
 381                                    name);
 382                 goto fail;
 383         }
 384
 385         if ((open_flags & O_ACCMODE) == O_RDONLY) {
 386                 tdb->read_only = true;
 387                 tdb->mmap_flags = PROT_READ;
 388         } else {
 389                 tdb->read_only = false;
 390                 tdb->mmap_flags = PROT_READ | PROT_WRITE;
 391         }
 392
 393         /* internal databases don't need any of the rest. */
 394         if (tdb->flags & TDB_INTERNAL) {
 395                 tdb->flags |= (TDB_NOLOCK | TDB_NOMMAP);
 396                 ecode = tdb_new_file(tdb);
 397                 if (ecode != TDB_SUCCESS) {
 398                         goto fail;
 399                 }
 400                 tdb->file->fd = -1;
 401                 ecode = tdb_new_database(tdb, seed, &hdr);
 402                 if (ecode != TDB_SUCCESS) {
 403                         goto fail;
 404                 }
 405                 if (name) {
 406                         tdb->name = strdup(name);
 407                         if (!tdb->name) {
 408                                 ecode = tdb_logerr(tdb, TDB_ERR_OOM,
 409                                                    TDB_LOG_ERROR,
 410                                                    "tdb_open: failed to"
 411                                                    " allocate name");
 412                                 goto fail;
 413                         }
 414                 }
 415                 tdb_convert(tdb, &hdr.hash_seed, sizeof(hdr.hash_seed));
 416                 tdb->hash_seed = hdr.hash_seed;
 417                 tdb_ftable_init(tdb);
 418                 return tdb;
 419         }
 420
 421         if (stat(name, &st) != -1)
 422                 tdb->file = find_file(st.st_dev, st.st_ino);
 423
 424         if (!tdb->file) {
 425                 int fd;
 426
 427                 if ((fd = open(name, open_flags, mode)) == -1) {
 428                         /* errno set by open(2) */
 429                         saved_errno = errno;
 430                         tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
 431                                    "tdb_open: could not open file %s: %s",
 432                                    name, strerror(errno));
 433                         goto fail_errno;
 434                 }
 435
 436                 /* on exec, don't inherit the fd */
 437                 v = fcntl(fd, F_GETFD, 0);
 438                 fcntl(fd, F_SETFD, v | FD_CLOEXEC);
 439
 440                 if (fstat(fd, &st) == -1) {
 441                         saved_errno = errno;
 442                         tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
 443                                    "tdb_open: could not stat open %s: %s",
 444                                    name, strerror(errno));
 445                         goto fail_errno;
 446                 }
 447
 448                 ecode = tdb_new_file(tdb);
 449                 if (ecode != TDB_SUCCESS)
 450                         goto fail;
 451
 452                 tdb->file->next = files;
 453                 tdb->file->fd = fd;
 454                 tdb->file->device = st.st_dev;
 455                 tdb->file->inode = st.st_ino;
 456                 tdb->file->map_ptr = NULL;
 457                 tdb->file->map_size = sizeof(struct tdb_header);
 458         }
 459
 460         /* ensure there is only one process initialising at once */
 461         ecode = tdb_lock_open(tdb, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK);
 462         if (ecode != TDB_SUCCESS) {
 463                 saved_errno = errno;
 464                 goto fail_errno;
 465         }
 466
 467         /* call their open hook if they gave us one. */
 468         if (openhook) {
 469                 ecode = openhook->fn(tdb->file->fd, openhook->data);
 470                 if (ecode != TDB_SUCCESS) {
 471                         tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
 472                                    "tdb_open: open hook failed");
 473                         goto fail;
 474                 }
 475                 open_flags |= O_CREAT;
 476         }
 477
 478         /* If they used O_TRUNC, read will return 0. */
 479         rlen = pread(tdb->file->fd, &hdr, sizeof(hdr), 0);
 480         if (rlen == 0 && (open_flags & O_CREAT)) {
 481                 ecode = tdb_new_database(tdb, seed, &hdr);
 482                 if (ecode != TDB_SUCCESS) {
 483                         goto fail;
 484                 }
 485         } else if (rlen < 0) {
 486                 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
 487                                    "tdb_open: error %s reading %s",
 488                                    strerror(errno), name);
 489                 goto fail;
 490         } else if (rlen < sizeof(hdr)
 491                    || strcmp(hdr.magic_food, TDB_MAGIC_FOOD) != 0) {
 492                 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
 493                                    "tdb_open: %s is not a tdb file", name);
 494                 goto fail;
 495         }
 496
 497         if (hdr.version != TDB_VERSION) {
 498                 if (hdr.version == bswap_64(TDB_VERSION))
 499                         tdb->flags |= TDB_CONVERT;
 500                 else {
 501                         /* wrong version */
 502                         ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
 503                                            "tdb_open:"
 504                                            " %s is unknown version 0x%llx",
 505                                            name, (long long)hdr.version);
 506                         goto fail;
 507                 }
 508         }
 509
 510         tdb_convert(tdb, &hdr, sizeof(hdr));
 511         tdb->hash_seed = hdr.hash_seed;
 512         hash_test = TDB_HASH_MAGIC;
 513         hash_test = tdb_hash(tdb, &hash_test, sizeof(hash_test));
 514         if (hdr.hash_test != hash_test) {
 515                 /* wrong hash variant */
 516                 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
 517                                    "tdb_open:"
 518                                    " %s uses a different hash function",
 519                                    name);
 520                 goto fail;
 521         }
 522
 523         tdb->name = strdup(name);
 524         if (!tdb->name) {
 525                 ecode = tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
 526                                    "tdb_open: failed to allocate name");
 527                 goto fail;
 528         }
 529
 530         /* Clear any features we don't understand. */
 531         if ((open_flags & O_ACCMODE) != O_RDONLY) {
 532                 hdr.features_used &= TDB_FEATURE_MASK;
 533                 if (tdb_write_convert(tdb, offsetof(struct tdb_header,
 534                                                     features_used),
 535                                       &hdr.features_used,
 536                                       sizeof(hdr.features_used)) == -1)
 537                         goto fail;
 538         }
 539
 540         tdb_unlock_open(tdb);
 541
 542         /* This make sure we have current map_size and mmap. */
 543         tdb->methods->oob(tdb, tdb->file->map_size + 1, true);
 544
 545         /* Now it's fully formed, recover if necessary. */
 546         berr = tdb_needs_recovery(tdb);
 547         if (unlikely(berr != false)) {
 548                 if (berr < 0) {
 549                         ecode = berr;
 550                         goto fail;
 551                 }
 552                 ecode = tdb_lock_and_recover(tdb);
 553                 if (ecode != TDB_SUCCESS) {
 554                         goto fail;
 555                 }
 556         }
 557
 558         ecode = tdb_ftable_init(tdb);
 559         if (ecode != TDB_SUCCESS) {
 560                 goto fail;
 561         }
 562
 563         /* Add to linked list if we're new. */
 564         if (tdb->file->refcnt == 1)
 565                 files = tdb->file;
 566         return tdb;
 567
 568  fail:
 569         /* Map ecode to some logical errno. */
 570         switch (ecode) {
 571         case TDB_ERR_CORRUPT:
 572         case TDB_ERR_IO:
 573                 saved_errno = EIO;
 574                 break;
 575         case TDB_ERR_LOCK:
 576                 saved_errno = EWOULDBLOCK;
 577                 break;
 578         case TDB_ERR_OOM:
 579                 saved_errno = ENOMEM;
 580                 break;
 581         case TDB_ERR_EINVAL:
 582                 saved_errno = EINVAL;
 583                 break;
 584         default:
 585                 saved_errno = EINVAL;
 586                 break;
 587         }
 588
 589 fail_errno:
 590 #ifdef TDB_TRACE
 591         close(tdb->tracefd);
 592 #endif
 593         free(cast_const(char *, tdb->name));
 594         if (tdb->file) {
 595                 tdb_lock_cleanup(tdb);
 596                 if (--tdb->file->refcnt == 0) {
 597                         assert(tdb->file->num_lockrecs == 0);
 598                         if (tdb->file->map_ptr) {
 599                                 if (tdb->flags & TDB_INTERNAL) {
 600                                         free(tdb->file->map_ptr);
 601                                 } else
 602                                         tdb_munmap(tdb->file);
 603                         }
 604                         if (close(tdb->file->fd) != 0)
 605                                 tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
 606                                            "tdb_open: failed to close tdb fd"
 607                                            " on error: %s", strerror(errno));
 608                         free(tdb->file->lockrecs);
 609                         free(tdb->file);
 610                 }
 611         }
 612
 613         free(tdb);
 614         errno = saved_errno;
 615         return NULL;
 616 }
 617
 618 int tdb_close(struct tdb_context *tdb)
 619 {
 620         int ret = 0;
 621
 622         tdb_trace(tdb, "tdb_close");
 623
 624         if (tdb->transaction) {
 625                 tdb_transaction_cancel(tdb);
 626         }
 627
 628         if (tdb->file->map_ptr) {
 629                 if (tdb->flags & TDB_INTERNAL)
 630                         free(tdb->file->map_ptr);
 631                 else
 632                         tdb_munmap(tdb->file);
 633         }
 634         free(cast_const(char *, tdb->name));
 635         if (tdb->file) {
 636                 struct tdb_file **i;
 637
 638                 tdb_lock_cleanup(tdb);
 639                 if (--tdb->file->refcnt == 0) {
 640                         ret = close(tdb->file->fd);
 641
 642                         /* Remove from files list */
 643                         for (i = &files; *i; i = &(*i)->next) {
 644                                 if (*i == tdb->file) {
 645                                         *i = tdb->file->next;
 646                                         break;
 647                                 }
 648                         }
 649                         free(tdb->file->lockrecs);
 650                         free(tdb->file);
 651                 }
 652         }
 653
 654 #ifdef TDB_TRACE
 655         close(tdb->tracefd);
 656 #endif
 657         free(tdb);
 658
 659         return ret;
 660 }