2 Unix SMB/CIFS implementation.
4 trivial database library
6 Copyright (C) Andrew Tridgell 1999-2005
7 Copyright (C) Paul `Rusty' Russell 2000
8 Copyright (C) Jeremy Allison 2000-2003
10 ** NOTE! The following LGPL license applies to the tdb
11 ** library. This does NOT imply that all of Samba is released
14 This library is free software; you can redistribute it and/or
15 modify it under the terms of the GNU Lesser General Public
16 License as published by the Free Software Foundation; either
17 version 3 of the License, or (at your option) any later version.
19 This library is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 Lesser General Public License for more details.
24 You should have received a copy of the GNU Lesser General Public
25 License along with this library; if not, see <http://www.gnu.org/licenses/>.
30 #include <ccan/build_assert/build_assert.h>
32 static int fcntl_lock(struct tdb_context *tdb,
33 int rw, off_t off, off_t len, bool waitflag)
38 fl.l_whence = SEEK_SET;
44 return fcntl(tdb->fd, F_SETLKW, &fl);
46 return fcntl(tdb->fd, F_SETLK, &fl);
49 static int fcntl_unlock(struct tdb_context *tdb, int rw, off_t off, off_t len)
52 #if 0 /* Check they matched up locks and unlocks correctly. */
57 locks = fopen("/proc/locks", "r");
59 while (fgets(line, 80, locks)) {
63 /* eg. 1: FLOCK ADVISORY WRITE 2440 08:01:2180826 0 EOF */
64 p = strchr(line, ':') + 1;
65 if (strncmp(p, " POSIX ADVISORY ", strlen(" POSIX ADVISORY ")))
67 p += strlen(" FLOCK ADVISORY ");
68 if (strncmp(p, "READ ", strlen("READ ")) == 0)
70 else if (strncmp(p, "WRITE ", strlen("WRITE ")) == 0)
75 if (atoi(p) != getpid())
77 p = strchr(strchr(p, ' ') + 1, ' ') + 1;
79 p = strchr(p, ' ') + 1;
80 if (strncmp(p, "EOF", 3) == 0)
83 l = atoi(p) - start + 1;
87 fprintf(stderr, "Len %u should be %u: %s",
92 fprintf(stderr, "Type %s wrong: %s",
93 rw == F_RDLCK ? "READ" : "WRITE", line);
102 fprintf(stderr, "Unlock on %u@%u not found!\n",
111 fl.l_whence = SEEK_SET;
116 return fcntl(tdb->fd, F_SETLKW, &fl);
119 /* a byte range locking function - return 0 on success
120 this functions locks/unlocks 1 byte at the specified offset.
122 note that a len of zero means lock to end of file
124 static int tdb_brlock(struct tdb_context *tdb,
125 int rw_type, tdb_off_t offset, tdb_off_t len,
126 enum tdb_lock_flags flags)
130 if (tdb->flags & TDB_NOLOCK) {
134 if (rw_type == F_WRLCK && tdb->read_only) {
135 tdb->ecode = TDB_ERR_RDONLY;
139 /* A 32 bit system cannot open a 64-bit file, but it could have
140 * expanded since then: check here. */
141 if ((size_t)(offset + len) != offset + len) {
142 tdb->ecode = TDB_ERR_IO;
143 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
144 "tdb_brlock: lock on giant offset %llu\n",
145 (long long)(offset + len));
150 ret = fcntl_lock(tdb, rw_type, offset, len,
151 flags & TDB_LOCK_WAIT);
152 } while (ret == -1 && errno == EINTR);
155 tdb->ecode = TDB_ERR_LOCK;
156 /* Generic lock error. errno set by fcntl.
157 * EAGAIN is an expected return from non-blocking
159 if (!(flags & TDB_LOCK_PROBE) && errno != EAGAIN) {
160 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
161 "tdb_brlock failed (fd=%d) at"
162 " offset %llu rw_type=%d flags=%d len=%llu\n",
163 tdb->fd, (long long)offset, rw_type,
164 flags, (long long)len);
171 static int tdb_brunlock(struct tdb_context *tdb,
172 int rw_type, tdb_off_t offset, size_t len)
176 if (tdb->flags & TDB_NOLOCK) {
181 ret = fcntl_unlock(tdb, rw_type, offset, len);
182 } while (ret == -1 && errno == EINTR);
185 tdb->log(tdb, TDB_DEBUG_TRACE, tdb->log_priv,
186 "tdb_brunlock failed (fd=%d) at offset %llu"
187 " rw_type=%d len=%llu\n",
188 tdb->fd, (long long)offset, rw_type, (long long)len);
195 upgrade a read lock to a write lock. This needs to be handled in a
196 special way as some OSes (such as solaris) have too conservative
197 deadlock detection and claim a deadlock when progress can be
198 made. For those OSes we may loop for a while.
200 int tdb_allrecord_upgrade(struct tdb_context *tdb)
204 if (tdb->allrecord_lock.count != 1) {
205 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
206 "tdb_allrecord_upgrade failed: count %u too high\n",
207 tdb->allrecord_lock.count);
211 if (tdb->allrecord_lock.off != 1) {
212 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
213 "tdb_allrecord_upgrade failed: already upgraded?\n");
219 if (tdb_brlock(tdb, F_WRLCK,
221 + (1ULL << tdb->header.v.hash_bits), 0,
222 TDB_LOCK_WAIT|TDB_LOCK_PROBE) == 0) {
223 tdb->allrecord_lock.ltype = F_WRLCK;
224 tdb->allrecord_lock.off = 0;
227 if (errno != EDEADLK) {
230 /* sleep for as short a time as we can - more portable than usleep() */
233 select(0, NULL, NULL, NULL, &tv);
235 tdb->log(tdb, TDB_DEBUG_WARNING, tdb->log_priv,
236 "tdb_allrecord_upgrade failed\n");
241 static struct tdb_lock_type *find_nestlock(struct tdb_context *tdb,
246 for (i=0; i<tdb->num_lockrecs; i++) {
247 if (tdb->lockrecs[i].off == offset) {
248 return &tdb->lockrecs[i];
254 /* lock an offset in the database. */
255 static int tdb_nest_lock(struct tdb_context *tdb, tdb_off_t offset, int ltype,
256 enum tdb_lock_flags flags)
258 struct tdb_lock_type *new_lck;
260 if (offset >= TDB_HASH_LOCK_START + TDB_HASH_LOCK_RANGE + tdb->map_size / 8) {
261 tdb->ecode = TDB_ERR_LOCK;
262 tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
263 "tdb_lock: invalid offset %llu ltype=%d\n",
264 (long long)offset, ltype);
268 if (tdb->flags & TDB_NOLOCK)
271 new_lck = find_nestlock(tdb, offset);
274 * Just increment the in-memory struct, posix locks
281 new_lck = (struct tdb_lock_type *)realloc(
283 sizeof(*tdb->lockrecs) * (tdb->num_lockrecs+1));
284 if (new_lck == NULL) {
285 tdb->ecode = TDB_ERR_OOM;
286 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
287 "tdb_lock: unable to allocate %llu lock structure",
288 (long long)(tdb->num_lockrecs + 1));
292 tdb->lockrecs = new_lck;
294 /* Since fcntl locks don't nest, we do a lock for the first one,
295 and simply bump the count for future ones */
296 if (tdb_brlock(tdb, ltype, offset, 1, flags)) {
300 tdb->lockrecs[tdb->num_lockrecs].off = offset;
301 tdb->lockrecs[tdb->num_lockrecs].count = 1;
302 tdb->lockrecs[tdb->num_lockrecs].ltype = ltype;
308 static int tdb_lock_and_recover(struct tdb_context *tdb)
314 /* We need to match locking order in transaction commit. */
315 if (tdb_brlock(tdb, F_WRLCK, FREELIST_TOP, 0, TDB_LOCK_WAIT)) {
319 if (tdb_brlock(tdb, F_WRLCK, OPEN_LOCK, 1, TDB_LOCK_WAIT)) {
320 tdb_brunlock(tdb, F_WRLCK, FREELIST_TOP, 0);
324 ret = tdb_transaction_recover(tdb);
326 tdb_brunlock(tdb, F_WRLCK, OPEN_LOCK, 1);
327 tdb_brunlock(tdb, F_WRLCK, FREELIST_TOP, 0);
336 static bool tdb_needs_recovery(struct tdb_context *tdb)
342 static int tdb_nest_unlock(struct tdb_context *tdb, tdb_off_t off, int ltype)
345 struct tdb_lock_type *lck;
347 if (tdb->flags & TDB_NOLOCK)
350 lck = find_nestlock(tdb, off);
351 if ((lck == NULL) || (lck->count == 0)) {
352 tdb->ecode = TDB_ERR_LOCK;
353 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
354 "tdb_unlock: no lock for %llu\n", (long long)off);
358 if (lck->count > 1) {
364 * This lock has count==1 left, so we need to unlock it in the
365 * kernel. We don't bother with decrementing the in-memory array
366 * element, we're about to overwrite it with the last array element
369 ret = tdb_brunlock(tdb, ltype, off, 1);
372 * Shrink the array by overwriting the element just unlocked with the
373 * last array element.
375 *lck = tdb->lockrecs[--tdb->num_lockrecs];
382 get the transaction lock
384 int tdb_transaction_lock(struct tdb_context *tdb, int ltype,
385 enum tdb_lock_flags lockflags)
387 return tdb_nest_lock(tdb, TRANSACTION_LOCK, ltype, lockflags);
391 release the transaction lock
393 int tdb_transaction_unlock(struct tdb_context *tdb, int ltype)
395 return tdb_nest_unlock(tdb, TRANSACTION_LOCK, ltype, false);
399 /* We only need to lock individual bytes, but Linux merges consecutive locks
400 * so we lock in contiguous ranges. */
401 static int tdb_lock_gradual(struct tdb_context *tdb,
402 int ltype, enum tdb_lock_flags flags,
403 tdb_off_t off, tdb_off_t len)
406 enum tdb_lock_flags nb_flags = (flags & ~TDB_LOCK_WAIT);
409 /* 0 would mean to end-of-file... */
411 /* Single hash. Just do blocking lock. */
412 return tdb_brlock(tdb, ltype, off, len, flags);
415 /* First we try non-blocking. */
416 ret = tdb_brlock(tdb, ltype, off, len, nb_flags);
421 /* Try locking first half, then second. */
422 ret = tdb_lock_gradual(tdb, ltype, flags, off, len / 2);
426 ret = tdb_lock_gradual(tdb, ltype, flags,
427 off + len / 2, len - len / 2);
429 tdb_brunlock(tdb, ltype, off, len / 2);
435 /* lock/unlock entire database. It can only be upgradable if you have some
436 * other way of guaranteeing exclusivity (ie. transaction write lock).
437 * Note that we don't lock the free chains: currently noone can get those locks
438 * without a hash chain lock first. */
439 int tdb_allrecord_lock(struct tdb_context *tdb, int ltype,
440 enum tdb_lock_flags flags, bool upgradable)
442 /* FIXME: There are no locks on read-only dbs */
443 if (tdb->read_only) {
444 tdb->ecode = TDB_ERR_LOCK;
445 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
446 "tdb_allrecord_lock: read-only\n");
450 if (tdb->allrecord_lock.count && tdb->allrecord_lock.ltype == ltype) {
451 tdb->allrecord_lock.count++;
455 if (tdb->allrecord_lock.count) {
456 /* a global lock of a different type exists */
457 tdb->ecode = TDB_ERR_LOCK;
458 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
459 "tdb_allrecord_lock: already have %s lock\n",
460 tdb->allrecord_lock.ltype == F_RDLCK
465 if (tdb_has_locks(tdb)) {
466 /* can't combine global and chain locks */
467 tdb->ecode = TDB_ERR_LOCK;
468 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
469 "tdb_allrecord_lock: already have chain lock\n");
473 if (upgradable && ltype != F_RDLCK) {
474 /* tdb error: you can't upgrade a write lock! */
475 tdb->ecode = TDB_ERR_LOCK;
476 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
477 "tdb_allrecord_lock: can't upgrade a write lock\n");
482 if (tdb_lock_gradual(tdb, ltype, flags, TDB_HASH_LOCK_START,
483 TDB_HASH_LOCK_RANGE)) {
484 if (!(flags & TDB_LOCK_PROBE)) {
485 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
486 "tdb_lockall hashes failed (%s)\n",
492 tdb->allrecord_lock.count = 1;
493 /* If it's upgradable, it's actually exclusive so we can treat
494 * it as a write lock. */
495 tdb->allrecord_lock.ltype = upgradable ? F_WRLCK : ltype;
496 tdb->allrecord_lock.off = upgradable;
498 /* Now check for needing recovery. */
499 if (unlikely(tdb_needs_recovery(tdb))) {
500 tdb_allrecord_unlock(tdb, ltype);
501 if (tdb_lock_and_recover(tdb) == -1) {
510 int tdb_lock_open(struct tdb_context *tdb)
512 return tdb_nest_lock(tdb, TDB_OPEN_LOCK, F_WRLCK, TDB_LOCK_WAIT);
515 void tdb_unlock_open(struct tdb_context *tdb)
517 tdb_nest_unlock(tdb, TDB_OPEN_LOCK, F_WRLCK);
520 int tdb_lock_expand(struct tdb_context *tdb, int ltype)
522 return tdb_nest_lock(tdb, TDB_EXPANSION_LOCK, ltype, TDB_LOCK_WAIT);
525 void tdb_unlock_expand(struct tdb_context *tdb, int ltype)
527 tdb_nest_unlock(tdb, TDB_EXPANSION_LOCK, ltype);
530 /* unlock entire db */
531 int tdb_allrecord_unlock(struct tdb_context *tdb, int ltype)
533 /* FIXME: There are no locks on read-only dbs */
534 if (tdb->read_only) {
535 tdb->ecode = TDB_ERR_LOCK;
536 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
537 "tdb_allrecord_unlock: read-only\n");
541 if (tdb->allrecord_lock.count == 0) {
542 tdb->ecode = TDB_ERR_LOCK;
543 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
544 "tdb_allrecord_unlock: not locked!\n");
548 /* Upgradable locks are marked as write locks. */
549 if (tdb->allrecord_lock.ltype != ltype
550 && (!tdb->allrecord_lock.off || ltype != F_RDLCK)) {
551 tdb->ecode = TDB_ERR_LOCK;
552 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
553 "tdb_allrecord_unlock: have %s lock\n",
554 tdb->allrecord_lock.ltype == F_RDLCK
559 if (tdb->allrecord_lock.count > 1) {
560 tdb->allrecord_lock.count--;
564 tdb->allrecord_lock.count = 0;
565 tdb->allrecord_lock.ltype = 0;
567 return tdb_brunlock(tdb, ltype, TDB_HASH_LOCK_START,
568 TDB_HASH_LOCK_RANGE);
571 bool tdb_has_expansion_lock(struct tdb_context *tdb)
573 return find_nestlock(tdb, TDB_EXPANSION_LOCK) != NULL
574 || (tdb->flags & TDB_NOLOCK);
577 bool tdb_has_locks(struct tdb_context *tdb)
579 return tdb->allrecord_lock.count || tdb->num_lockrecs;
583 /* lock entire database with write lock */
584 int tdb_lockall(struct tdb_context *tdb)
586 tdb_trace(tdb, "tdb_lockall");
587 return tdb_allrecord_lock(tdb, F_WRLCK, TDB_LOCK_WAIT, false);
590 /* lock entire database with write lock - nonblocking varient */
591 int tdb_lockall_nonblock(struct tdb_context *tdb)
593 int ret = tdb_allrecord_lock(tdb, F_WRLCK, TDB_LOCK_NOWAIT, false);
594 tdb_trace_ret(tdb, "tdb_lockall_nonblock", ret);
598 /* unlock entire database with write lock */
599 int tdb_unlockall(struct tdb_context *tdb)
601 tdb_trace(tdb, "tdb_unlockall");
602 return tdb_allrecord_unlock(tdb, F_WRLCK);
605 /* lock entire database with read lock */
606 int tdb_lockall_read(struct tdb_context *tdb)
608 tdb_trace(tdb, "tdb_lockall_read");
609 return tdb_allrecord_lock(tdb, F_RDLCK, TDB_LOCK_WAIT, false);
612 /* lock entire database with read lock - nonblock varient */
613 int tdb_lockall_read_nonblock(struct tdb_context *tdb)
615 int ret = tdb_allrecord_lock(tdb, F_RDLCK, TDB_LOCK_NOWAIT, false);
616 tdb_trace_ret(tdb, "tdb_lockall_read_nonblock", ret);
620 /* unlock entire database with read lock */
621 int tdb_unlockall_read(struct tdb_context *tdb)
623 tdb_trace(tdb, "tdb_unlockall_read");
624 return tdb_allrecord_unlock(tdb, F_RDLCK);
628 int tdb_lock_hashes(struct tdb_context *tdb,
630 tdb_len_t hash_range,
631 int ltype, enum tdb_lock_flags waitflag)
633 /* FIXME: Do this properly, using hlock_range */
634 unsigned lock = TDB_HASH_LOCK_START
635 + (hash_lock >> (64 - TDB_HASH_LOCK_RANGE_BITS));
637 /* a allrecord lock allows us to avoid per chain locks */
638 if (tdb->allrecord_lock.count &&
639 (ltype == tdb->allrecord_lock.ltype || ltype == F_RDLCK)) {
643 if (tdb->allrecord_lock.count) {
644 tdb->ecode = TDB_ERR_LOCK;
645 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
646 "tdb_lock_list: have %s allrecordlock\n",
647 tdb->allrecord_lock.ltype == F_RDLCK
652 return tdb_nest_lock(tdb, lock, ltype, waitflag);
655 int tdb_unlock_hashes(struct tdb_context *tdb,
657 tdb_len_t hash_range, int ltype)
659 unsigned lock = TDB_HASH_LOCK_START
660 + (hash_lock >> (64 - TDB_HASH_LOCK_RANGE_BITS));
662 /* a allrecord lock allows us to avoid per chain locks */
663 if (tdb->allrecord_lock.count) {
664 if (tdb->allrecord_lock.ltype == F_RDLCK
665 && ltype == F_WRLCK) {
666 tdb->ecode = TDB_ERR_LOCK;
667 tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
668 "tdb_unlock_list RO allrecord!\n");
674 return tdb_nest_unlock(tdb, lock, ltype);
677 /* Hash locks use TDB_HASH_LOCK_START + the next 30 bits.
678 * Then we begin; bucket offsets are sizeof(tdb_len_t) apart, so we divide.
679 * The result is that on 32 bit systems we don't use lock values > 2^31 on
680 * files that are less than 4GB.
682 static tdb_off_t free_lock_off(tdb_off_t b_off)
684 return TDB_HASH_LOCK_START + TDB_HASH_LOCK_RANGE + b_off / sizeof(tdb_off_t);
687 int tdb_lock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off,
688 enum tdb_lock_flags waitflag)
690 assert(b_off >= sizeof(struct tdb_header));
692 /* You're supposed to have a hash lock first! */
693 if (!(tdb->flags & TDB_NOLOCK) && !tdb_has_locks(tdb)) {
694 tdb->ecode = TDB_ERR_LOCK;
695 tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
696 "tdb_lock_free_list without lock!\n");
700 /* a allrecord lock allows us to avoid per chain locks */
701 if (tdb->allrecord_lock.count) {
702 if (tdb->allrecord_lock.ltype == F_WRLCK)
704 tdb->ecode = TDB_ERR_LOCK;
705 tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
706 "tdb_lock_free_list with RO allrecordlock!\n");
710 return tdb_nest_lock(tdb, free_lock_off(b_off), F_WRLCK, waitflag);
713 void tdb_unlock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off)
715 if (tdb->allrecord_lock.count)
718 tdb_nest_unlock(tdb, free_lock_off(b_off), F_WRLCK);
721 /* Even if the entry isn't in this hash bucket, you'd have to lock this
722 * bucket to find it. */
723 static int chainlock(struct tdb_context *tdb, const TDB_DATA *key,
724 int ltype, enum tdb_lock_flags waitflag,
728 uint64_t h = tdb_hash(tdb, key->dptr, key->dsize);
730 ret = tdb_lock_hashes(tdb, h, 1, ltype, waitflag);
731 tdb_trace_1rec(tdb, func, *key);
735 /* lock/unlock one hash chain. This is meant to be used to reduce
736 contention - it cannot guarantee how many records will be locked */
737 int tdb_chainlock(struct tdb_context *tdb, TDB_DATA key)
739 return chainlock(tdb, &key, F_WRLCK, TDB_LOCK_WAIT, "tdb_chainlock");
742 int tdb_chainunlock(struct tdb_context *tdb, TDB_DATA key)
744 uint64_t h = tdb_hash(tdb, key.dptr, key.dsize);
745 tdb_trace_1rec(tdb, "tdb_chainunlock", key);
746 return tdb_unlock_hashes(tdb, h, 1, F_WRLCK);
750 /* lock/unlock one hash chain, non-blocking. This is meant to be used
751 to reduce contention - it cannot guarantee how many records will be
753 int tdb_chainlock_nonblock(struct tdb_context *tdb, TDB_DATA key)
755 return chainlock(tdb, &key, F_WRLCK, TDB_LOCK_NOWAIT,
756 "tdb_chainlock_nonblock");
759 int tdb_chainlock_read(struct tdb_context *tdb, TDB_DATA key)
761 return chainlock(tdb, &key, F_RDLCK, TDB_LOCK_WAIT,
762 "tdb_chainlock_read");
765 int tdb_chainunlock_read(struct tdb_context *tdb, TDB_DATA key)
767 uint64_t h = tdb_hash(tdb, key.dptr, key.dsize);
768 tdb_trace_1rec(tdb, "tdb_chainunlock_read", key);
769 return tdb_unlock_list(tdb, h & ((1ULL << tdb->header.v.hash_bits)-1),
773 /* record lock stops delete underneath */
774 int tdb_lock_record(struct tdb_context *tdb, tdb_off_t off)
776 if (tdb->allrecord_lock.count) {
779 return off ? tdb_brlock(tdb, F_RDLCK, off, 1, TDB_LOCK_WAIT) : 0;
783 Write locks override our own fcntl readlocks, so check it here.
784 Note this is meant to be F_SETLK, *not* F_SETLKW, as it's not
785 an error to fail to get the lock here.
787 int tdb_write_lock_record(struct tdb_context *tdb, tdb_off_t off)
789 struct tdb_traverse_lock *i;
790 for (i = &tdb->travlocks; i; i = i->next)
793 if (tdb->allrecord_lock.count) {
794 if (tdb->allrecord_lock.ltype == F_WRLCK) {
799 return tdb_brlock(tdb, F_WRLCK, off, 1, TDB_LOCK_NOWAIT|TDB_LOCK_PROBE);
802 int tdb_write_unlock_record(struct tdb_context *tdb, tdb_off_t off)
804 if (tdb->allrecord_lock.count) {
807 return tdb_brunlock(tdb, F_WRLCK, off, 1);
810 /* fcntl locks don't stack: avoid unlocking someone else's */
811 int tdb_unlock_record(struct tdb_context *tdb, tdb_off_t off)
813 struct tdb_traverse_lock *i;
816 if (tdb->allrecord_lock.count) {
822 for (i = &tdb->travlocks; i; i = i->next)
825 return (count == 1 ? tdb_brunlock(tdb, F_RDLCK, off, 1) : 0);
828 /* The transaction code uses this to remove all locks. */
829 void tdb_release_transaction_locks(struct tdb_context *tdb)
833 if (tdb->allrecord_lock.count != 0) {
834 tdb_off_t hash_size, free_size;
836 hash_size = (1ULL << tdb->header.v.hash_bits)
838 free_size = tdb->header.v.free_zones
839 * (tdb->header.v.free_buckets + 1) * sizeof(tdb_off_t);
841 tdb_brunlock(tdb, tdb->allrecord_lock.ltype,
842 tdb->header.v.hash_off, hash_size);
843 tdb_brunlock(tdb, tdb->allrecord_lock.ltype,
844 tdb->header.v.free_off, free_size);
845 tdb->allrecord_lock.count = 0;
846 tdb->allrecord_lock.ltype = 0;
849 for (i = 0; i<tdb->num_lockrecs; i++) {
850 struct tdb_lock_type *lck = &tdb->lockrecs[i];
852 tdb_brunlock(tdb, lck->ltype, lck->off, 1);
854 tdb->num_lockrecs = 0;
855 SAFE_FREE(tdb->lockrecs);
856 tdb->header_uptodate = false;
860 void tdb_lock_init(struct tdb_context *tdb)
862 tdb->num_lockrecs = 0;
863 tdb->lockrecs = NULL;
864 tdb->allrecord_lock.count = 0;