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/>.
28 #include "tdb1_private.h"
34 non-blocking increment of the tdb sequence number if the tdb has been opened using
37 void tdb1_increment_seqnum_nonblock(struct tdb_context *tdb)
41 if (!(tdb->flags & TDB_SEQNUM)) {
45 /* we ignore errors from this, as we have no sane way of
48 tdb1_ofs_read(tdb, TDB1_SEQNUM_OFS, &seqnum);
50 tdb1_ofs_write(tdb, TDB1_SEQNUM_OFS, &seqnum);
54 increment the tdb sequence number if the tdb has been opened using
57 static void tdb1_increment_seqnum(struct tdb_context *tdb)
59 if (!(tdb->flags & TDB_SEQNUM)) {
63 if (tdb1_nest_lock(tdb, TDB1_SEQNUM_OFS, F_WRLCK,
64 TDB_LOCK_WAIT|TDB_LOCK_PROBE) != 0) {
68 tdb1_increment_seqnum_nonblock(tdb);
70 tdb1_nest_unlock(tdb, TDB1_SEQNUM_OFS, F_WRLCK);
73 static int tdb1_key_compare(TDB_DATA key, TDB_DATA data, void *private_data)
75 return memcmp(data.dptr, key.dptr, data.dsize);
78 /* Returns 0 on fail. On success, return offset of record, and fills
80 static tdb1_off_t tdb1_find(struct tdb_context *tdb, TDB_DATA key, uint32_t hash,
81 struct tdb1_record *r)
85 /* read in the hash top */
86 if (tdb1_ofs_read(tdb, TDB1_HASH_TOP(hash), &rec_ptr) == -1)
89 /* keep looking until we find the right record */
91 if (tdb1_rec_read(tdb, rec_ptr, r) == -1)
94 if (!TDB1_DEAD(r) && hash==r->full_hash
95 && key.dsize==r->key_len
96 && tdb1_parse_data(tdb, key, rec_ptr + sizeof(*r),
97 r->key_len, tdb1_key_compare,
101 /* detect tight infinite loop */
102 if (rec_ptr == r->next) {
103 tdb->last_error = tdb_logerr(tdb, TDB_ERR_CORRUPT,
105 "tdb1_find: loop detected.");
110 tdb->last_error = TDB_ERR_NOEXIST;
114 /* As tdb1_find, but if you succeed, keep the lock */
115 tdb1_off_t tdb1_find_lock_hash(struct tdb_context *tdb, TDB_DATA key, uint32_t hash, int locktype,
116 struct tdb1_record *rec)
120 if (tdb1_lock(tdb, TDB1_BUCKET(hash), locktype) == -1)
122 if (!(rec_ptr = tdb1_find(tdb, key, hash, rec)))
123 tdb1_unlock(tdb, TDB1_BUCKET(hash), locktype);
127 static TDB_DATA _tdb1_fetch(struct tdb_context *tdb, TDB_DATA key);
129 /* update an entry in place - this only works if the new data size
130 is <= the old data size and the key exists.
131 on failure return -1.
133 static int tdb1_update_hash(struct tdb_context *tdb, TDB_DATA key, uint32_t hash, TDB_DATA dbuf)
135 struct tdb1_record rec;
139 if (!(rec_ptr = tdb1_find(tdb, key, hash, &rec)))
142 /* it could be an exact duplicate of what is there - this is
143 * surprisingly common (eg. with a ldb re-index). */
144 if (rec.key_len == key.dsize &&
145 rec.data_len == dbuf.dsize &&
146 rec.full_hash == hash) {
147 TDB_DATA data = _tdb1_fetch(tdb, key);
148 if (data.dsize == dbuf.dsize &&
149 memcmp(data.dptr, dbuf.dptr, data.dsize) == 0) {
160 /* must be long enough key, data and tailer */
161 if (rec.rec_len < key.dsize + dbuf.dsize + sizeof(tdb1_off_t)) {
162 tdb->last_error = TDB_SUCCESS; /* Not really an error */
166 if (tdb->tdb1.io->tdb1_write(tdb, rec_ptr + sizeof(rec) + rec.key_len,
167 dbuf.dptr, dbuf.dsize) == -1)
170 if (dbuf.dsize != rec.data_len) {
172 rec.data_len = dbuf.dsize;
173 return tdb1_rec_write(tdb, rec_ptr, &rec);
179 /* find an entry in the database given a key */
180 /* If an entry doesn't exist tdb1_err will be set to
181 * TDB_ERR_NOEXIST. If a key has no data attached
182 * then the TDB_DATA will have zero length but
185 static TDB_DATA _tdb1_fetch(struct tdb_context *tdb, TDB_DATA key)
188 struct tdb1_record rec;
192 /* find which hash bucket it is in */
193 hash = tdb_hash(tdb, key.dptr, key.dsize);
194 if (!(rec_ptr = tdb1_find_lock_hash(tdb,key,hash,F_RDLCK,&rec)))
197 ret.dptr = tdb1_alloc_read(tdb, rec_ptr + sizeof(rec) + rec.key_len,
199 ret.dsize = rec.data_len;
200 tdb1_unlock(tdb, TDB1_BUCKET(rec.full_hash), F_RDLCK);
204 enum TDB_ERROR tdb1_fetch(struct tdb_context *tdb, TDB_DATA key, TDB_DATA *data)
206 *data = _tdb1_fetch(tdb, key);
207 if (data->dptr == NULL)
208 return tdb->last_error;
213 * Find an entry in the database and hand the record's data to a parsing
214 * function. The parsing function is executed under the chain read lock, so it
215 * should be fast and should not block on other syscalls.
217 * DON'T CALL OTHER TDB CALLS FROM THE PARSER, THIS MIGHT LEAD TO SEGFAULTS.
219 * For mmapped tdb's that do not have a transaction open it points the parsing
220 * function directly at the mmap area, it avoids the malloc/memcpy in this
221 * case. If a transaction is open or no mmap is available, it has to do
222 * malloc/read/parse/free.
224 * This is interesting for all readers of potentially large data structures in
225 * the tdb records, ldb indexes being one example.
227 * Return -1 if the record was not found.
230 int tdb1_parse_record(struct tdb_context *tdb, TDB_DATA key,
231 int (*parser)(TDB_DATA key, TDB_DATA data,
236 struct tdb1_record rec;
240 /* find which hash bucket it is in */
241 hash = tdb_hash(tdb, key.dptr, key.dsize);
243 if (!(rec_ptr = tdb1_find_lock_hash(tdb,key,hash,F_RDLCK,&rec))) {
244 /* record not found */
245 tdb->last_error = TDB_ERR_NOEXIST;
249 ret = tdb1_parse_data(tdb, key, rec_ptr + sizeof(rec) + rec.key_len,
250 rec.data_len, parser, private_data);
252 tdb1_unlock(tdb, TDB1_BUCKET(rec.full_hash), F_RDLCK);
257 /* check if an entry in the database exists
259 note that 1 is returned if the key is found and 0 is returned if not found
260 this doesn't match the conventions in the rest of this module, but is
263 static int tdb1_exists_hash(struct tdb_context *tdb, TDB_DATA key, uint32_t hash)
265 struct tdb1_record rec;
267 if (tdb1_find_lock_hash(tdb, key, hash, F_RDLCK, &rec) == 0)
269 tdb1_unlock(tdb, TDB1_BUCKET(rec.full_hash), F_RDLCK);
273 int tdb1_exists(struct tdb_context *tdb, TDB_DATA key)
275 uint32_t hash = tdb_hash(tdb, key.dptr, key.dsize);
278 ret = tdb1_exists_hash(tdb, key, hash);
282 /* actually delete an entry in the database given the offset */
283 int tdb1_do_delete(struct tdb_context *tdb, tdb1_off_t rec_ptr, struct tdb1_record *rec)
285 tdb1_off_t last_ptr, i;
286 struct tdb1_record lastrec;
288 if ((tdb->flags & TDB_RDONLY) || tdb->tdb1.traverse_read) return -1;
290 if (((tdb->tdb1.traverse_write != 0) && (!TDB1_DEAD(rec))) ||
291 tdb1_write_lock_record(tdb, rec_ptr) == -1) {
292 /* Someone traversing here: mark it as dead */
293 rec->magic = TDB1_DEAD_MAGIC;
294 return tdb1_rec_write(tdb, rec_ptr, rec);
296 if (tdb1_write_unlock_record(tdb, rec_ptr) != 0)
299 /* find previous record in hash chain */
300 if (tdb1_ofs_read(tdb, TDB1_HASH_TOP(rec->full_hash), &i) == -1)
302 for (last_ptr = 0; i != rec_ptr; last_ptr = i, i = lastrec.next)
303 if (tdb1_rec_read(tdb, i, &lastrec) == -1)
306 /* unlink it: next ptr is at start of record. */
308 last_ptr = TDB1_HASH_TOP(rec->full_hash);
309 if (tdb1_ofs_write(tdb, last_ptr, &rec->next) == -1)
312 /* recover the space */
313 if (tdb1_free(tdb, rec_ptr, rec) == -1)
318 static int tdb1_count_dead(struct tdb_context *tdb, uint32_t hash)
322 struct tdb1_record rec;
324 /* read in the hash top */
325 if (tdb1_ofs_read(tdb, TDB1_HASH_TOP(hash), &rec_ptr) == -1)
329 if (tdb1_rec_read(tdb, rec_ptr, &rec) == -1)
332 if (rec.magic == TDB1_DEAD_MAGIC) {
341 * Purge all DEAD records from a hash chain
343 static int tdb1_purge_dead(struct tdb_context *tdb, uint32_t hash)
346 struct tdb1_record rec;
349 if (tdb1_lock(tdb, -1, F_WRLCK) == -1) {
353 /* read in the hash top */
354 if (tdb1_ofs_read(tdb, TDB1_HASH_TOP(hash), &rec_ptr) == -1)
360 if (tdb1_rec_read(tdb, rec_ptr, &rec) == -1) {
366 if (rec.magic == TDB1_DEAD_MAGIC
367 && tdb1_do_delete(tdb, rec_ptr, &rec) == -1) {
374 tdb1_unlock(tdb, -1, F_WRLCK);
378 /* delete an entry in the database given a key */
379 static int tdb1_delete_hash(struct tdb_context *tdb, TDB_DATA key, uint32_t hash)
382 struct tdb1_record rec;
385 if (tdb->tdb1.max_dead_records != 0) {
388 * Allow for some dead records per hash chain, mainly for
389 * tdb's with a very high create/delete rate like locking.tdb.
392 if (tdb1_lock(tdb, TDB1_BUCKET(hash), F_WRLCK) == -1)
395 if (tdb1_count_dead(tdb, hash) >= tdb->tdb1.max_dead_records) {
397 * Don't let the per-chain freelist grow too large,
398 * delete all existing dead records
400 tdb1_purge_dead(tdb, hash);
403 if (!(rec_ptr = tdb1_find(tdb, key, hash, &rec))) {
404 tdb1_unlock(tdb, TDB1_BUCKET(hash), F_WRLCK);
409 * Just mark the record as dead.
411 rec.magic = TDB1_DEAD_MAGIC;
412 ret = tdb1_rec_write(tdb, rec_ptr, &rec);
415 if (!(rec_ptr = tdb1_find_lock_hash(tdb, key, hash, F_WRLCK,
419 ret = tdb1_do_delete(tdb, rec_ptr, &rec);
423 tdb1_increment_seqnum(tdb);
426 if (tdb1_unlock(tdb, TDB1_BUCKET(rec.full_hash), F_WRLCK) != 0)
427 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
428 "tdb1_delete: WARNING tdb1_unlock failed!");
432 int tdb1_delete(struct tdb_context *tdb, TDB_DATA key)
434 uint32_t hash = tdb_hash(tdb, key.dptr, key.dsize);
437 ret = tdb1_delete_hash(tdb, key, hash);
442 * See if we have a dead record around with enough space
444 static tdb1_off_t tdb1_find_dead(struct tdb_context *tdb, uint32_t hash,
445 struct tdb1_record *r, tdb1_len_t length)
449 /* read in the hash top */
450 if (tdb1_ofs_read(tdb, TDB1_HASH_TOP(hash), &rec_ptr) == -1)
453 /* keep looking until we find the right record */
455 if (tdb1_rec_read(tdb, rec_ptr, r) == -1)
458 if (TDB1_DEAD(r) && r->rec_len >= length) {
460 * First fit for simple coding, TODO: change to best
470 static int _tdb1_store(struct tdb_context *tdb, TDB_DATA key,
471 TDB_DATA dbuf, int flag, uint32_t hash)
473 struct tdb1_record rec;
478 /* check for it existing, on insert. */
479 if (flag == TDB_INSERT) {
480 if (tdb1_exists_hash(tdb, key, hash)) {
481 tdb->last_error = TDB_ERR_EXISTS;
485 /* first try in-place update, on modify or replace. */
486 if (tdb1_update_hash(tdb, key, hash, dbuf) == 0) {
489 if (tdb->last_error == TDB_ERR_NOEXIST &&
490 flag == TDB_MODIFY) {
491 /* if the record doesn't exist and we are in TDB1_MODIFY mode then
492 we should fail the store */
496 /* reset the error code potentially set by the tdb1_update() */
497 tdb->last_error = TDB_SUCCESS;
499 /* delete any existing record - if it doesn't exist we don't
500 care. Doing this first reduces fragmentation, and avoids
501 coalescing with `allocated' block before it's updated. */
502 if (flag != TDB_INSERT)
503 tdb1_delete_hash(tdb, key, hash);
505 /* Copy key+value *before* allocating free space in case malloc
506 fails and we are left with a dead spot in the tdb. */
508 if (!(p = (char *)malloc(key.dsize + dbuf.dsize))) {
509 tdb->last_error = TDB_ERR_OOM;
513 memcpy(p, key.dptr, key.dsize);
515 memcpy(p+key.dsize, dbuf.dptr, dbuf.dsize);
517 if (tdb->tdb1.max_dead_records != 0) {
519 * Allow for some dead records per hash chain, look if we can
520 * find one that can hold the new record. We need enough space
521 * for key, data and tailer. If we find one, we don't have to
522 * consult the central freelist.
524 rec_ptr = tdb1_find_dead(
526 key.dsize + dbuf.dsize + sizeof(tdb1_off_t));
529 rec.key_len = key.dsize;
530 rec.data_len = dbuf.dsize;
531 rec.full_hash = hash;
532 rec.magic = TDB1_MAGIC;
533 if (tdb1_rec_write(tdb, rec_ptr, &rec) == -1
534 || tdb->tdb1.io->tdb1_write(
535 tdb, rec_ptr + sizeof(rec),
536 p, key.dsize + dbuf.dsize) == -1) {
544 * We have to allocate some space from the freelist, so this means we
545 * have to lock it. Use the chance to purge all the DEAD records from
546 * the hash chain under the freelist lock.
549 if (tdb1_lock(tdb, -1, F_WRLCK) == -1) {
553 if ((tdb->tdb1.max_dead_records != 0)
554 && (tdb1_purge_dead(tdb, hash) == -1)) {
555 tdb1_unlock(tdb, -1, F_WRLCK);
559 /* we have to allocate some space */
560 rec_ptr = tdb1_allocate(tdb, key.dsize + dbuf.dsize, &rec);
562 tdb1_unlock(tdb, -1, F_WRLCK);
568 /* Read hash top into next ptr */
569 if (tdb1_ofs_read(tdb, TDB1_HASH_TOP(hash), &rec.next) == -1)
572 rec.key_len = key.dsize;
573 rec.data_len = dbuf.dsize;
574 rec.full_hash = hash;
575 rec.magic = TDB1_MAGIC;
577 /* write out and point the top of the hash chain at it */
578 if (tdb1_rec_write(tdb, rec_ptr, &rec) == -1
579 || tdb->tdb1.io->tdb1_write(tdb, rec_ptr+sizeof(rec), p, key.dsize+dbuf.dsize)==-1
580 || tdb1_ofs_write(tdb, TDB1_HASH_TOP(hash), &rec_ptr) == -1) {
581 /* Need to tdb1_unallocate() here */
589 tdb1_increment_seqnum(tdb);
596 /* store an element in the database, replacing any existing element
599 return 0 on success, -1 on failure
601 int tdb1_store(struct tdb_context *tdb, TDB_DATA key, TDB_DATA dbuf, int flag)
606 assert(tdb->flags & TDB_VERSION1);
608 if ((tdb->flags & TDB_RDONLY) || tdb->tdb1.traverse_read) {
609 tdb->last_error = TDB_ERR_RDONLY;
613 /* find which hash bucket it is in */
614 hash = tdb_hash(tdb, key.dptr, key.dsize);
615 if (tdb1_lock(tdb, TDB1_BUCKET(hash), F_WRLCK) == -1)
618 ret = _tdb1_store(tdb, key, dbuf, flag, hash);
619 tdb1_unlock(tdb, TDB1_BUCKET(hash), F_WRLCK);
623 /* Append to an entry. Create if not exist. */
624 int tdb1_append(struct tdb_context *tdb, TDB_DATA key, TDB_DATA new_dbuf)
630 /* find which hash bucket it is in */
631 hash = tdb_hash(tdb, key.dptr, key.dsize);
632 if (tdb1_lock(tdb, TDB1_BUCKET(hash), F_WRLCK) == -1)
635 dbuf = _tdb1_fetch(tdb, key);
637 if (dbuf.dptr == NULL) {
638 dbuf.dptr = (unsigned char *)malloc(new_dbuf.dsize);
640 unsigned int new_len = dbuf.dsize + new_dbuf.dsize;
641 unsigned char *new_dptr;
643 /* realloc '0' is special: don't do that. */
646 new_dptr = (unsigned char *)realloc(dbuf.dptr, new_len);
647 if (new_dptr == NULL) {
650 dbuf.dptr = new_dptr;
653 if (dbuf.dptr == NULL) {
654 tdb->last_error = TDB_ERR_OOM;
658 memcpy(dbuf.dptr + dbuf.dsize, new_dbuf.dptr, new_dbuf.dsize);
659 dbuf.dsize += new_dbuf.dsize;
661 ret = _tdb1_store(tdb, key, dbuf, 0, hash);
664 tdb1_unlock(tdb, TDB1_BUCKET(hash), F_WRLCK);
665 SAFE_FREE(dbuf.dptr);
671 get the tdb sequence number. Only makes sense if the writers opened
672 with TDB1_SEQNUM set. Note that this sequence number will wrap quite
673 quickly, so it should only be used for a 'has something changed'
674 test, not for code that relies on the count of the number of changes
675 made. If you want a counter then use a tdb record.
677 The aim of this sequence number is to allow for a very lightweight
678 test of a possible tdb change.
680 int tdb1_get_seqnum(struct tdb_context *tdb)
684 tdb1_ofs_read(tdb, TDB1_SEQNUM_OFS, &seqnum);
690 add a region of the file to the freelist. Length is the size of the region in bytes,
691 which includes the free list header that needs to be added
693 static int tdb1_free_region(struct tdb_context *tdb, tdb1_off_t offset, ssize_t length)
695 struct tdb1_record rec;
696 if (length <= sizeof(rec)) {
697 /* the region is not worth adding */
700 if (length + offset > tdb->file->map_size) {
701 tdb->last_error = tdb_logerr(tdb, TDB_ERR_CORRUPT, TDB_LOG_ERROR,
702 "tdb1_free_region: adding region beyond"
706 memset(&rec,'\0',sizeof(rec));
707 rec.rec_len = length - sizeof(rec);
708 if (tdb1_free(tdb, offset, &rec) == -1) {
709 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
710 "tdb1_free_region: failed to add free record");
717 wipe the entire database, deleting all records. This can be done
718 very fast by using a allrecord lock. The entire data portion of the
719 file becomes a single entry in the freelist.
721 This code carefully steps around the recovery area, leaving it alone
723 int tdb1_wipe_all(struct tdb_context *tdb)
726 tdb1_off_t offset = 0;
728 tdb1_off_t recovery_head;
729 tdb1_len_t recovery_size = 0;
731 if (tdb1_lockall(tdb) != 0) {
736 /* see if the tdb has a recovery area, and remember its size
737 if so. We don't want to lose this as otherwise each
738 tdb1_wipe_all() in a transaction will increase the size of
739 the tdb by the size of the recovery area */
740 if (tdb1_ofs_read(tdb, TDB1_RECOVERY_HEAD, &recovery_head) == -1) {
741 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
742 "tdb1_wipe_all: failed to read recovery head");
746 if (recovery_head != 0) {
747 struct tdb1_record rec;
748 if (tdb->tdb1.io->tdb1_read(tdb, recovery_head, &rec, sizeof(rec), TDB1_DOCONV()) == -1) {
749 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
750 "tdb1_wipe_all: failed to read recovery record");
753 recovery_size = rec.rec_len + sizeof(rec);
756 /* wipe the hashes */
757 for (i=0;i<tdb->tdb1.header.hash_size;i++) {
758 if (tdb1_ofs_write(tdb, TDB1_HASH_TOP(i), &offset) == -1) {
759 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
760 "tdb1_wipe_all: failed to write hash %d", i);
765 /* wipe the freelist */
766 if (tdb1_ofs_write(tdb, TDB1_FREELIST_TOP, &offset) == -1) {
767 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
768 "tdb1_wipe_all: failed to write freelist");
772 /* add all the rest of the file to the freelist, possibly leaving a gap
773 for the recovery area */
774 if (recovery_size == 0) {
775 /* the simple case - the whole file can be used as a freelist */
776 data_len = (tdb->file->map_size - TDB1_DATA_START(tdb->tdb1.header.hash_size));
777 if (tdb1_free_region(tdb, TDB1_DATA_START(tdb->tdb1.header.hash_size), data_len) != 0) {
781 /* we need to add two freelist entries - one on either
782 side of the recovery area
784 Note that we cannot shift the recovery area during
785 this operation. Only the transaction.c code may
786 move the recovery area or we risk subtle data
789 data_len = (recovery_head - TDB1_DATA_START(tdb->tdb1.header.hash_size));
790 if (tdb1_free_region(tdb, TDB1_DATA_START(tdb->tdb1.header.hash_size), data_len) != 0) {
793 /* and the 2nd free list entry after the recovery area - if any */
794 data_len = tdb->file->map_size - (recovery_head+recovery_size);
795 if (tdb1_free_region(tdb, recovery_head+recovery_size, data_len) != 0) {
800 if (tdb1_unlockall(tdb) != 0) {
801 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
802 "tdb1_wipe_all: failed to unlock");
813 struct traverse_state {
814 enum TDB_ERROR error;
815 struct tdb_context *dest_db;
819 traverse function for repacking
821 static int repack_traverse(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data, void *private_data)
823 struct traverse_state *state = (struct traverse_state *)private_data;
824 if (tdb1_store(state->dest_db, key, data, TDB_INSERT) != 0) {
825 state->error = state->dest_db->last_error;
834 int tdb1_repack(struct tdb_context *tdb)
836 struct tdb_context *tmp_db;
837 struct traverse_state state;
838 union tdb_attribute hsize;
840 hsize.base.attr = TDB_ATTRIBUTE_TDB1_HASHSIZE;
841 hsize.base.next = NULL;
842 hsize.tdb1_hashsize.hsize = tdb->tdb1.header.hash_size;
844 if (tdb1_transaction_start(tdb) != 0) {
845 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
846 __location__ " Failed to start transaction");
850 tmp_db = tdb_open("tmpdb", TDB_INTERNAL, O_RDWR|O_CREAT, 0, &hsize);
851 if (tmp_db == NULL) {
852 tdb->last_error = tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
853 __location__ " Failed to create tmp_db");
854 tdb1_transaction_cancel(tdb);
858 state.error = TDB_SUCCESS;
859 state.dest_db = tmp_db;
861 if (tdb1_traverse_read(tdb, repack_traverse, &state) == -1) {
862 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
863 __location__ " Failed to traverse copying out");
864 tdb1_transaction_cancel(tdb);
869 if (state.error != TDB_SUCCESS) {
870 tdb->last_error = tdb_logerr(tdb, state.error, TDB_LOG_ERROR,
871 __location__ " Error during traversal");
872 tdb1_transaction_cancel(tdb);
877 if (tdb1_wipe_all(tdb) != 0) {
878 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
879 __location__ " Failed to wipe database\n");
880 tdb1_transaction_cancel(tdb);
885 state.error = TDB_SUCCESS;
888 if (tdb1_traverse_read(tmp_db, repack_traverse, &state) == -1) {
889 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
890 __location__ " Failed to traverse copying back");
891 tdb1_transaction_cancel(tdb);
897 tdb->last_error = tdb_logerr(tdb, state.error, TDB_LOG_ERROR,
898 __location__ " Error during second traversal");
899 tdb1_transaction_cancel(tdb);
906 if (tdb1_transaction_commit(tdb) != 0) {
907 tdb_logerr(tdb, tdb->last_error, TDB_LOG_ERROR,
908 __location__ " Failed to commit");
915 /* Even on files, we can get partial writes due to signals. */
916 bool tdb1_write_all(int fd, const void *buf, size_t count)
920 ret = write(fd, buf, count);
923 buf = (const char *)buf + ret;