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TDB2: more internal cleanups after TDB1 compatibility removal.
[Samba/gebeck_regimport.git] / lib / tdb2 / open.c
blobfab855b6b85af54948d3cc187880b1214db3342d
1 /*
2 Trivial Database 2: opening and closing TDBs
3 Copyright (C) Rusty Russell 2010
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 3 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 */
18 #include "private.h"
19 #include <ccan/build_assert/build_assert.h>
20 #include <assert.h>
21
22 /* all tdbs, to detect double-opens (fcntl file don't nest!) */
23 static struct tdb_context *tdbs = NULL;
24
25 static struct tdb_file *find_file(dev_t device, ino_t ino)
26 {
27 struct tdb_context *i;
28
29 for (i = tdbs; i; i = i->next) {
30 if (i->file->device == device && i->file->inode == ino) {
31 i->file->refcnt++;
32 return i->file;
33 }
34 }
35 return NULL;
36 }
37
38 static bool read_all(int fd, void *buf, size_t len)
39 {
40 while (len) {
41 ssize_t ret;
42 ret = read(fd, buf, len);
43 if (ret < 0)
44 return false;
45 if (ret == 0) {
46 /* ETOOSHORT? */
47 errno = EWOULDBLOCK;
48 return false;
49 }
50 buf = (char *)buf + ret;
51 len -= ret;
52 }
53 return true;
54 }
55
56 static uint64_t random_number(struct tdb_context *tdb)
57 {
58 int fd;
59 uint64_t ret = 0;
60 struct timeval now;
61
62 fd = open("/dev/urandom", O_RDONLY);
63 if (fd >= 0) {
64 if (read_all(fd, &ret, sizeof(ret))) {
65 close(fd);
66 return ret;
67 }
68 close(fd);
69 }
70 /* FIXME: Untested! Based on Wikipedia protocol description! */
71 fd = open("/dev/egd-pool", O_RDWR);
72 if (fd >= 0) {
73 /* Command is 1, next byte is size we want to read. */
74 char cmd[2] = { 1, sizeof(uint64_t) };
75 if (write(fd, cmd, sizeof(cmd)) == sizeof(cmd)) {
76 char reply[1 + sizeof(uint64_t)];
77 int r = read(fd, reply, sizeof(reply));
78 if (r > 1) {
79 /* Copy at least some bytes. */
80 memcpy(&ret, reply+1, r - 1);
81 if (reply[0] == sizeof(uint64_t)
82 && r == sizeof(reply)) {
83 close(fd);
84 return ret;
85 }
86 }
87 }
88 close(fd);
89 }
90
91 /* Fallback: pid and time. */
92 gettimeofday(&now, NULL);
93 ret = getpid() * 100132289ULL + now.tv_sec * 1000000ULL + now.tv_usec;
94 tdb_logerr(tdb, TDB_SUCCESS, TDB_LOG_WARNING,
95 "tdb_open: random from getpid and time");
96 return ret;
97 }
98
99 static void tdb2_context_init(struct tdb_context *tdb)
100 {
101 /* Initialize the TDB2 fields here */
102 tdb_io_init(tdb);
103 tdb->direct_access = 0;
104 tdb->transaction = NULL;
105 tdb->access = NULL;
106 }
107
108 struct new_database {
109 struct tdb_header hdr;
110 struct tdb_freetable ftable;
111 };
112
113 /* initialise a new database */
114 static enum TDB_ERROR tdb_new_database(struct tdb_context *tdb,
115 struct tdb_attribute_seed *seed,
116 struct tdb_header *hdr)
117 {
118 /* We make it up in memory, then write it out if not internal */
119 struct new_database newdb;
120 unsigned int magic_len;
121 ssize_t rlen;
122 enum TDB_ERROR ecode;
123
124 /* Fill in the header */
125 newdb.hdr.version = TDB_VERSION;
126 if (seed)
127 newdb.hdr.hash_seed = seed->seed;
128 else
129 newdb.hdr.hash_seed = random_number(tdb);
130 newdb.hdr.hash_test = TDB_HASH_MAGIC;
131 newdb.hdr.hash_test = tdb->hash_fn(&newdb.hdr.hash_test,
132 sizeof(newdb.hdr.hash_test),
133 newdb.hdr.hash_seed,
134 tdb->hash_data);
135 newdb.hdr.recovery = 0;
136 newdb.hdr.features_used = newdb.hdr.features_offered = TDB_FEATURE_MASK;
137 newdb.hdr.seqnum = 0;
138 newdb.hdr.capabilities = 0;
139 memset(newdb.hdr.reserved, 0, sizeof(newdb.hdr.reserved));
140 /* Initial hashes are empty. */
141 memset(newdb.hdr.hashtable, 0, sizeof(newdb.hdr.hashtable));
142
143 /* Free is empty. */
144 newdb.hdr.free_table = offsetof(struct new_database, ftable);
145 memset(&newdb.ftable, 0, sizeof(newdb.ftable));
146 ecode = set_header(NULL, &newdb.ftable.hdr, TDB_FTABLE_MAGIC, 0,
147 sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
148 sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
149 0);
150 if (ecode != TDB_SUCCESS) {
151 return ecode;
152 }
153
154 /* Magic food */
155 memset(newdb.hdr.magic_food, 0, sizeof(newdb.hdr.magic_food));
156 strcpy(newdb.hdr.magic_food, TDB_MAGIC_FOOD);
157
158 /* This creates an endian-converted database, as if read from disk */
159 magic_len = sizeof(newdb.hdr.magic_food);
160 tdb_convert(tdb,
161 (char *)&newdb.hdr + magic_len, sizeof(newdb) - magic_len);
162
163 *hdr = newdb.hdr;
164
165 if (tdb->flags & TDB_INTERNAL) {
166 tdb->file->map_size = sizeof(newdb);
167 tdb->file->map_ptr = malloc(tdb->file->map_size);
168 if (!tdb->file->map_ptr) {
169 return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
170 "tdb_new_database:"
171 " failed to allocate");
172 }
173 memcpy(tdb->file->map_ptr, &newdb, tdb->file->map_size);
174 return TDB_SUCCESS;
175 }
176 if (lseek(tdb->file->fd, 0, SEEK_SET) == -1) {
177 return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
178 "tdb_new_database:"
179 " failed to seek: %s", strerror(errno));
180 }
181
182 if (ftruncate(tdb->file->fd, 0) == -1) {
183 return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
184 "tdb_new_database:"
185 " failed to truncate: %s", strerror(errno));
186 }
187
188 rlen = write(tdb->file->fd, &newdb, sizeof(newdb));
189 if (rlen != sizeof(newdb)) {
190 if (rlen >= 0)
191 errno = ENOSPC;
192 return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
193 "tdb_new_database: %zi writing header: %s",
194 rlen, strerror(errno));
195 }
196 return TDB_SUCCESS;
197 }
198
199 static enum TDB_ERROR tdb_new_file(struct tdb_context *tdb)
200 {
201 tdb->file = malloc(sizeof(*tdb->file));
202 if (!tdb->file)
203 return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
204 "tdb_open: cannot alloc tdb_file structure");
205 tdb->file->num_lockrecs = 0;
206 tdb->file->lockrecs = NULL;
207 tdb->file->allrecord_lock.count = 0;
208 tdb->file->refcnt = 1;
209 tdb->file->map_ptr = NULL;
210 return TDB_SUCCESS;
211 }
212
213 _PUBLIC_ enum TDB_ERROR tdb_set_attribute(struct tdb_context *tdb,
214 const union tdb_attribute *attr)
215 {
216 switch (attr->base.attr) {
217 case TDB_ATTRIBUTE_LOG:
218 tdb->log_fn = attr->log.fn;
219 tdb->log_data = attr->log.data;
220 break;
221 case TDB_ATTRIBUTE_HASH:
222 case TDB_ATTRIBUTE_SEED:
223 case TDB_ATTRIBUTE_OPENHOOK:
224 return tdb->last_error
225 = tdb_logerr(tdb, TDB_ERR_EINVAL,
226 TDB_LOG_USE_ERROR,
227 "tdb_set_attribute:"
228 " cannot set %s after opening",
229 attr->base.attr == TDB_ATTRIBUTE_HASH
230 ? "TDB_ATTRIBUTE_HASH"
231 : attr->base.attr == TDB_ATTRIBUTE_SEED
232 ? "TDB_ATTRIBUTE_SEED"
233 : "TDB_ATTRIBUTE_OPENHOOK");
234 case TDB_ATTRIBUTE_STATS:
235 return tdb->last_error
236 = tdb_logerr(tdb, TDB_ERR_EINVAL,
237 TDB_LOG_USE_ERROR,
238 "tdb_set_attribute:"
239 " cannot set TDB_ATTRIBUTE_STATS");
240 case TDB_ATTRIBUTE_FLOCK:
241 tdb->lock_fn = attr->flock.lock;
242 tdb->unlock_fn = attr->flock.unlock;
243 tdb->lock_data = attr->flock.data;
244 break;
245 default:
246 return tdb->last_error
247 = tdb_logerr(tdb, TDB_ERR_EINVAL,
248 TDB_LOG_USE_ERROR,
249 "tdb_set_attribute:"
250 " unknown attribute type %u",
251 attr->base.attr);
252 }
253 return TDB_SUCCESS;
254 }
255
256 _PUBLIC_ enum TDB_ERROR tdb_get_attribute(struct tdb_context *tdb,
257 union tdb_attribute *attr)
258 {
259 switch (attr->base.attr) {
260 case TDB_ATTRIBUTE_LOG:
261 if (!tdb->log_fn)
262 return tdb->last_error = TDB_ERR_NOEXIST;
263 attr->log.fn = tdb->log_fn;
264 attr->log.data = tdb->log_data;
265 break;
266 case TDB_ATTRIBUTE_HASH:
267 attr->hash.fn = tdb->hash_fn;
268 attr->hash.data = tdb->hash_data;
269 break;
270 case TDB_ATTRIBUTE_SEED:
271 attr->seed.seed = tdb->hash_seed;
272 break;
273 case TDB_ATTRIBUTE_OPENHOOK:
274 if (!tdb->openhook)
275 return tdb->last_error = TDB_ERR_NOEXIST;
276 attr->openhook.fn = tdb->openhook;
277 attr->openhook.data = tdb->openhook_data;
278 break;
279 case TDB_ATTRIBUTE_STATS: {
280 size_t size = attr->stats.size;
281 if (size > tdb->stats.size)
282 size = tdb->stats.size;
283 memcpy(&attr->stats, &tdb->stats, size);
284 break;
285 }
286 case TDB_ATTRIBUTE_FLOCK:
287 attr->flock.lock = tdb->lock_fn;
288 attr->flock.unlock = tdb->unlock_fn;
289 attr->flock.data = tdb->lock_data;
290 break;
291 default:
292 return tdb->last_error
293 = tdb_logerr(tdb, TDB_ERR_EINVAL,
294 TDB_LOG_USE_ERROR,
295 "tdb_get_attribute:"
296 " unknown attribute type %u",
297 attr->base.attr);
298 }
299 attr->base.next = NULL;
300 return TDB_SUCCESS;
301 }
302
303 _PUBLIC_ void tdb_unset_attribute(struct tdb_context *tdb,
304 enum tdb_attribute_type type)
305 {
306 switch (type) {
307 case TDB_ATTRIBUTE_LOG:
308 tdb->log_fn = NULL;
309 break;
310 case TDB_ATTRIBUTE_OPENHOOK:
311 tdb->openhook = NULL;
312 break;
313 case TDB_ATTRIBUTE_HASH:
314 case TDB_ATTRIBUTE_SEED:
315 tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
316 "tdb_unset_attribute: cannot unset %s after opening",
317 type == TDB_ATTRIBUTE_HASH
318 ? "TDB_ATTRIBUTE_HASH"
319 : "TDB_ATTRIBUTE_SEED");
320 break;
321 case TDB_ATTRIBUTE_STATS:
322 tdb_logerr(tdb, TDB_ERR_EINVAL,
323 TDB_LOG_USE_ERROR,
324 "tdb_unset_attribute:"
325 "cannot unset TDB_ATTRIBUTE_STATS");
326 break;
327 case TDB_ATTRIBUTE_FLOCK:
328 tdb->lock_fn = tdb_fcntl_lock;
329 tdb->unlock_fn = tdb_fcntl_unlock;
330 break;
331 default:
332 tdb_logerr(tdb, TDB_ERR_EINVAL,
333 TDB_LOG_USE_ERROR,
334 "tdb_unset_attribute: unknown attribute type %u",
335 type);
336 }
337 }
338
339 /* The top three bits of the capability tell us whether it matters. */
340 enum TDB_ERROR unknown_capability(struct tdb_context *tdb, const char *caller,
341 tdb_off_t type)
342 {
343 if (type & TDB_CAP_NOOPEN) {
344 return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
345 "%s: file has unknown capability %llu",
346 caller, type & TDB_CAP_NOOPEN);
347 }
348
349 if ((type & TDB_CAP_NOWRITE) && !(tdb->flags & TDB_RDONLY)) {
350 return tdb_logerr(tdb, TDB_ERR_RDONLY, TDB_LOG_ERROR,
351 "%s: file has unknown capability %llu"
352 " (cannot write to it)",
353 caller, type & TDB_CAP_NOOPEN);
354 }
355
356 if (type & TDB_CAP_NOCHECK) {
357 tdb->flags |= TDB_CANT_CHECK;
358 }
359 return TDB_SUCCESS;
360 }
361
362 static enum TDB_ERROR capabilities_ok(struct tdb_context *tdb,
363 tdb_off_t capabilities)
364 {
365 tdb_off_t off, next;
366 enum TDB_ERROR ecode = TDB_SUCCESS;
367 const struct tdb_capability *cap;
368
369 /* Check capability list. */
370 for (off = capabilities; off && ecode == TDB_SUCCESS; off = next) {
371 cap = tdb_access_read(tdb, off, sizeof(*cap), true);
372 if (TDB_PTR_IS_ERR(cap)) {
373 return TDB_PTR_ERR(cap);
374 }
375
376 switch (cap->type & TDB_CAP_TYPE_MASK) {
377 /* We don't understand any capabilities (yet). */
378 default:
379 ecode = unknown_capability(tdb, "tdb_open", cap->type);
380 }
381 next = cap->next;
382 tdb_access_release(tdb, cap);
383 }
384 return ecode;
385 }
386
387 _PUBLIC_ struct tdb_context *tdb_open(const char *name, int tdb_flags,
388 int open_flags, mode_t mode,
389 union tdb_attribute *attr)
390 {
391 struct tdb_context *tdb;
392 struct stat st;
393 int saved_errno = 0;
394 uint64_t hash_test;
395 unsigned v;
396 ssize_t rlen;
397 struct tdb_header hdr;
398 struct tdb_attribute_seed *seed = NULL;
399 tdb_bool_err berr;
400 enum TDB_ERROR ecode;
401 int openlock;
402
403 tdb = malloc(sizeof(*tdb) + (name ? strlen(name) + 1 : 0));
404 if (!tdb) {
405 /* Can't log this */
406 errno = ENOMEM;
407 return NULL;
408 }
409 /* Set name immediately for logging functions. */
410 if (name) {
411 tdb->name = strcpy((char *)(tdb + 1), name);
412 } else {
413 tdb->name = NULL;
414 }
415 tdb->flags = tdb_flags;
416 tdb->log_fn = NULL;
417 tdb->open_flags = open_flags;
418 tdb->last_error = TDB_SUCCESS;
419 tdb->file = NULL;
420 tdb->openhook = NULL;
421 tdb->lock_fn = tdb_fcntl_lock;
422 tdb->unlock_fn = tdb_fcntl_unlock;
423 tdb->hash_fn = tdb_jenkins_hash;
424 memset(&tdb->stats, 0, sizeof(tdb->stats));
425 tdb->stats.base.attr = TDB_ATTRIBUTE_STATS;
426 tdb->stats.size = sizeof(tdb->stats);
427
428 while (attr) {
429 switch (attr->base.attr) {
430 case TDB_ATTRIBUTE_HASH:
431 tdb->hash_fn = attr->hash.fn;
432 tdb->hash_data = attr->hash.data;
433 break;
434 case TDB_ATTRIBUTE_SEED:
435 seed = &attr->seed;
436 break;
437 case TDB_ATTRIBUTE_OPENHOOK:
438 tdb->openhook = attr->openhook.fn;
439 tdb->openhook_data = attr->openhook.data;
440 break;
441 default:
442 /* These are set as normal. */
443 ecode = tdb_set_attribute(tdb, attr);
444 if (ecode != TDB_SUCCESS)
445 goto fail;
446 }
447 attr = attr->base.next;
448 }
449
450 if (tdb_flags & ~(TDB_INTERNAL | TDB_NOLOCK | TDB_NOMMAP | TDB_CONVERT
451 | TDB_NOSYNC | TDB_SEQNUM | TDB_ALLOW_NESTING
452 | TDB_RDONLY)) {
453 ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
454 "tdb_open: unknown flags %u", tdb_flags);
455 goto fail;
456 }
457
458 if (seed) {
459 if (!(tdb_flags & TDB_INTERNAL) && !(open_flags & O_CREAT)) {
460 ecode = tdb_logerr(tdb, TDB_ERR_EINVAL,
461 TDB_LOG_USE_ERROR,
462 "tdb_open:"
463 " cannot set TDB_ATTRIBUTE_SEED"
464 " without O_CREAT.");
465 goto fail;
466 }
467 }
468
469 if ((open_flags & O_ACCMODE) == O_WRONLY) {
470 ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
471 "tdb_open: can't open tdb %s write-only",
472 name);
473 goto fail;
474 }
475
476 if ((open_flags & O_ACCMODE) == O_RDONLY) {
477 openlock = F_RDLCK;
478 tdb->flags |= TDB_RDONLY;
479 } else {
480 if (tdb_flags & TDB_RDONLY) {
481 ecode = tdb_logerr(tdb, TDB_ERR_EINVAL,
482 TDB_LOG_USE_ERROR,
483 "tdb_open: can't use TDB_RDONLY"
484 " without O_RDONLY");
485 goto fail;
486 }
487 openlock = F_WRLCK;
488 }
489
490 /* internal databases don't need any of the rest. */
491 if (tdb->flags & TDB_INTERNAL) {
492 tdb->flags |= (TDB_NOLOCK | TDB_NOMMAP);
493 ecode = tdb_new_file(tdb);
494 if (ecode != TDB_SUCCESS) {
495 goto fail;
496 }
497 tdb->file->fd = -1;
498 ecode = tdb_new_database(tdb, seed, &hdr);
499 if (ecode == TDB_SUCCESS) {
500 tdb_convert(tdb, &hdr.hash_seed,
501 sizeof(hdr.hash_seed));
502 tdb->hash_seed = hdr.hash_seed;
503 tdb2_context_init(tdb);
504 tdb_ftable_init(tdb);
505 }
506 if (ecode != TDB_SUCCESS) {
507 goto fail;
508 }
509 return tdb;
510 }
511
512 if (stat(name, &st) != -1)
513 tdb->file = find_file(st.st_dev, st.st_ino);
514
515 if (!tdb->file) {
516 int fd;
517
518 if ((fd = open(name, open_flags, mode)) == -1) {
519 /* errno set by open(2) */
520 saved_errno = errno;
521 tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
522 "tdb_open: could not open file %s: %s",
523 name, strerror(errno));
524 goto fail_errno;
525 }
526
527 /* on exec, don't inherit the fd */
528 v = fcntl(fd, F_GETFD, 0);
529 fcntl(fd, F_SETFD, v | FD_CLOEXEC);
530
531 if (fstat(fd, &st) == -1) {
532 saved_errno = errno;
533 tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
534 "tdb_open: could not stat open %s: %s",
535 name, strerror(errno));
536 close(fd);
537 goto fail_errno;
538 }
539
540 ecode = tdb_new_file(tdb);
541 if (ecode != TDB_SUCCESS) {
542 close(fd);
543 goto fail;
544 }
545
546 tdb->file->fd = fd;
547 tdb->file->device = st.st_dev;
548 tdb->file->inode = st.st_ino;
549 tdb->file->map_ptr = NULL;
550 tdb->file->map_size = 0;
551 }
552
553 /* ensure there is only one process initialising at once */
554 ecode = tdb_lock_open(tdb, openlock, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK);
555 if (ecode != TDB_SUCCESS) {
556 saved_errno = errno;
557 goto fail_errno;
558 }
559
560 /* call their open hook if they gave us one. */
561 if (tdb->openhook) {
562 ecode = tdb->openhook(tdb->file->fd, tdb->openhook_data);
563 if (ecode != TDB_SUCCESS) {
564 tdb_logerr(tdb, ecode, TDB_LOG_ERROR,
565 "tdb_open: open hook failed");
566 goto fail;
567 }
568 open_flags |= O_CREAT;
569 }
570
571 /* If they used O_TRUNC, read will return 0. */
572 rlen = pread(tdb->file->fd, &hdr, sizeof(hdr), 0);
573 if (rlen == 0 && (open_flags & O_CREAT)) {
574 ecode = tdb_new_database(tdb, seed, &hdr);
575 if (ecode != TDB_SUCCESS) {
576 goto fail;
577 }
578 } else if (rlen < 0) {
579 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
580 "tdb_open: error %s reading %s",
581 strerror(errno), name);
582 goto fail;
583 } else if (rlen < sizeof(hdr)
584 || strcmp(hdr.magic_food, TDB_MAGIC_FOOD) != 0) {
585 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
586 "tdb_open: %s is not a tdb2 file", name);
587 goto fail;
588 }
589
590 if (hdr.version != TDB_VERSION) {
591 if (hdr.version == bswap_64(TDB_VERSION))
592 tdb->flags |= TDB_CONVERT;
593 else {
594 /* wrong version */
595 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
596 "tdb_open:"
597 " %s is unknown version 0x%llx",
598 name, (long long)hdr.version);
599 goto fail;
600 }
601 } else if (tdb->flags & TDB_CONVERT) {
602 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
603 "tdb_open:"
604 " %s does not need TDB_CONVERT",
605 name);
606 goto fail;
607 }
608
609 tdb2_context_init(tdb);
610
611 tdb_convert(tdb, &hdr, sizeof(hdr));
612 tdb->hash_seed = hdr.hash_seed;
613 hash_test = TDB_HASH_MAGIC;
614 hash_test = tdb_hash(tdb, &hash_test, sizeof(hash_test));
615 if (hdr.hash_test != hash_test) {
616 /* wrong hash variant */
617 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
618 "tdb_open:"
619 " %s uses a different hash function",
620 name);
621 goto fail;
622 }
623
624 ecode = capabilities_ok(tdb, hdr.capabilities);
625 if (ecode != TDB_SUCCESS) {
626 goto fail;
627 }
628
629 /* Clear any features we don't understand. */
630 if ((open_flags & O_ACCMODE) != O_RDONLY) {
631 hdr.features_used &= TDB_FEATURE_MASK;
632 ecode = tdb_write_convert(tdb, offsetof(struct tdb_header,
633 features_used),
634 &hdr.features_used,
635 sizeof(hdr.features_used));
636 if (ecode != TDB_SUCCESS)
637 goto fail;
638 }
639
640 tdb_unlock_open(tdb, openlock);
641
642 /* This makes sure we have current map_size and mmap. */
643 ecode = tdb->io->oob(tdb, tdb->file->map_size, 1, true);
644 if (unlikely(ecode != TDB_SUCCESS))
645 goto fail;
646
647 /* Now it's fully formed, recover if necessary. */
648 berr = tdb_needs_recovery(tdb);
649 if (unlikely(berr != false)) {
650 if (berr < 0) {
651 ecode = TDB_OFF_TO_ERR(berr);
652 goto fail;
653 }
654 ecode = tdb_lock_and_recover(tdb);
655 if (ecode != TDB_SUCCESS) {
656 goto fail;
657 }
658 }
659
660 ecode = tdb_ftable_init(tdb);
661 if (ecode != TDB_SUCCESS) {
662 goto fail;
663 }
664
665 tdb->next = tdbs;
666 tdbs = tdb;
667 return tdb;
668
669 fail:
670 /* Map ecode to some logical errno. */
671 switch (TDB_ERR_TO_OFF(ecode)) {
672 case TDB_ERR_TO_OFF(TDB_ERR_CORRUPT):
673 case TDB_ERR_TO_OFF(TDB_ERR_IO):
674 saved_errno = EIO;
675 break;
676 case TDB_ERR_TO_OFF(TDB_ERR_LOCK):
677 saved_errno = EWOULDBLOCK;
678 break;
679 case TDB_ERR_TO_OFF(TDB_ERR_OOM):
680 saved_errno = ENOMEM;
681 break;
682 case TDB_ERR_TO_OFF(TDB_ERR_EINVAL):
683 saved_errno = EINVAL;
684 break;
685 default:
686 saved_errno = EINVAL;
687 break;
688 }
689
690 fail_errno:
691 #ifdef TDB_TRACE
692 close(tdb->tracefd);
693 #endif
694 if (tdb->file) {
695 tdb_lock_cleanup(tdb);
696 if (--tdb->file->refcnt == 0) {
697 assert(tdb->file->num_lockrecs == 0);
698 if (tdb->file->map_ptr) {
699 if (tdb->flags & TDB_INTERNAL) {
700 free(tdb->file->map_ptr);
701 } else
702 tdb_munmap(tdb->file);
703 }
704 if (close(tdb->file->fd) != 0)
705 tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
706 "tdb_open: failed to close tdb fd"
707 " on error: %s", strerror(errno));
708 free(tdb->file->lockrecs);
709 free(tdb->file);
710 }
711 }
712
713 free(tdb);
714 errno = saved_errno;
715 return NULL;
716 }
717
718 _PUBLIC_ int tdb_close(struct tdb_context *tdb)
719 {
720 int ret = 0;
721 struct tdb_context **i;
722
723 tdb_trace(tdb, "tdb_close");
724
725 if (tdb->transaction) {
726 tdb_transaction_cancel(tdb);
727 }
728
729 if (tdb->file->map_ptr) {
730 if (tdb->flags & TDB_INTERNAL)
731 free(tdb->file->map_ptr);
732 else
733 tdb_munmap(tdb->file);
734 }
735 if (tdb->file) {
736 tdb_lock_cleanup(tdb);
737 if (--tdb->file->refcnt == 0) {
738 ret = close(tdb->file->fd);
739 free(tdb->file->lockrecs);
740 free(tdb->file);
741 }
742 }
743
744 /* Remove from tdbs list */
745 for (i = &tdbs; *i; i = &(*i)->next) {
746 if (*i == tdb) {
747 *i = tdb->next;
748 break;
749 }
750 }
751
752 #ifdef TDB_TRACE
753 close(tdb->tracefd);
754 #endif
755 free(tdb);
756
757 return ret;
758 }
759
760 _PUBLIC_ void tdb_foreach_(int (*fn)(struct tdb_context *, void *), void *p)
761 {
762 struct tdb_context *i;
763
764 for (i = tdbs; i; i = i->next) {
765 if (fn(i, p) != 0)
766 break;
767 }
768 }
reg import