2 Unix SMB/CIFS implementation.
3 Database interface wrapper around ctdbd
4 Copyright (C) Volker Lendecke 2007-2009
5 Copyright (C) Michael Adam 2009
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.
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.
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/>.
22 #ifdef CLUSTER_SUPPORT
24 #include "ctdb_private.h"
25 #include "ctdbd_conn.h"
28 struct db_ctdb_transaction_handle {
29 struct db_ctdb_ctx *ctx;
31 * we store the reads and writes done under a transaction:
32 * - one list stores both reads and writes (m_all),
33 * - the other just writes (m_write)
35 struct ctdb_marshall_buffer *m_all;
36 struct ctdb_marshall_buffer *m_write;
43 struct db_context *db;
44 struct tdb_wrap *wtdb;
46 struct db_ctdb_transaction_handle *transaction;
47 struct g_lock_ctx *lock_ctx;
51 struct db_ctdb_ctx *ctdb_ctx;
52 struct ctdb_ltdb_header header;
55 static struct db_record *fetch_locked_internal(struct db_ctdb_ctx *ctx,
60 static NTSTATUS tdb_error_to_ntstatus(struct tdb_context *tdb)
63 enum TDB_ERROR tret = tdb_error(tdb);
67 status = NT_STATUS_OBJECT_NAME_COLLISION;
70 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
73 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
82 * fetch a record from the tdb, separating out the header
83 * information and returning the body of the record.
85 static NTSTATUS db_ctdb_ltdb_fetch(struct db_ctdb_ctx *db,
87 struct ctdb_ltdb_header *header,
94 rec = tdb_fetch(db->wtdb->tdb, key);
95 if (rec.dsize < sizeof(struct ctdb_ltdb_header)) {
96 status = NT_STATUS_NOT_FOUND;
101 header->dmaster = (uint32_t)-1;
108 *header = *(struct ctdb_ltdb_header *)rec.dptr;
112 data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
113 if (data->dsize == 0) {
116 data->dptr = (unsigned char *)talloc_memdup(mem_ctx,
118 + sizeof(struct ctdb_ltdb_header),
120 if (data->dptr == NULL) {
121 status = NT_STATUS_NO_MEMORY;
127 status = NT_STATUS_OK;
135 * Store a record together with the ctdb record header
136 * in the local copy of the database.
138 static NTSTATUS db_ctdb_ltdb_store(struct db_ctdb_ctx *db,
140 struct ctdb_ltdb_header *header,
143 TALLOC_CTX *tmp_ctx = talloc_stackframe();
147 rec.dsize = data.dsize + sizeof(struct ctdb_ltdb_header);
148 rec.dptr = (uint8_t *)talloc_size(tmp_ctx, rec.dsize);
150 if (rec.dptr == NULL) {
151 talloc_free(tmp_ctx);
152 return NT_STATUS_NO_MEMORY;
155 memcpy(rec.dptr, header, sizeof(struct ctdb_ltdb_header));
156 memcpy(sizeof(struct ctdb_ltdb_header) + (uint8_t *)rec.dptr, data.dptr, data.dsize);
158 ret = tdb_store(db->wtdb->tdb, key, rec, TDB_REPLACE);
160 talloc_free(tmp_ctx);
162 return (ret == 0) ? NT_STATUS_OK
163 : tdb_error_to_ntstatus(db->wtdb->tdb);
168 form a ctdb_rec_data record from a key/data pair
170 note that header may be NULL. If not NULL then it is included in the data portion
173 static struct ctdb_rec_data *db_ctdb_marshall_record(TALLOC_CTX *mem_ctx, uint32_t reqid,
175 struct ctdb_ltdb_header *header,
179 struct ctdb_rec_data *d;
181 length = offsetof(struct ctdb_rec_data, data) + key.dsize +
182 data.dsize + (header?sizeof(*header):0);
183 d = (struct ctdb_rec_data *)talloc_size(mem_ctx, length);
189 d->keylen = key.dsize;
190 memcpy(&d->data[0], key.dptr, key.dsize);
192 d->datalen = data.dsize + sizeof(*header);
193 memcpy(&d->data[key.dsize], header, sizeof(*header));
194 memcpy(&d->data[key.dsize+sizeof(*header)], data.dptr, data.dsize);
196 d->datalen = data.dsize;
197 memcpy(&d->data[key.dsize], data.dptr, data.dsize);
203 /* helper function for marshalling multiple records */
204 static struct ctdb_marshall_buffer *db_ctdb_marshall_add(TALLOC_CTX *mem_ctx,
205 struct ctdb_marshall_buffer *m,
209 struct ctdb_ltdb_header *header,
212 struct ctdb_rec_data *r;
213 size_t m_size, r_size;
214 struct ctdb_marshall_buffer *m2 = NULL;
216 r = db_ctdb_marshall_record(talloc_tos(), reqid, key, header, data);
223 m = (struct ctdb_marshall_buffer *)talloc_zero_size(
224 mem_ctx, offsetof(struct ctdb_marshall_buffer, data));
231 m_size = talloc_get_size(m);
232 r_size = talloc_get_size(r);
234 m2 = (struct ctdb_marshall_buffer *)talloc_realloc_size(
235 mem_ctx, m, m_size + r_size);
241 memcpy(m_size + (uint8_t *)m2, r, r_size);
250 /* we've finished marshalling, return a data blob with the marshalled records */
251 static TDB_DATA db_ctdb_marshall_finish(struct ctdb_marshall_buffer *m)
254 data.dptr = (uint8_t *)m;
255 data.dsize = talloc_get_size(m);
260 loop over a marshalling buffer
262 - pass r==NULL to start
263 - loop the number of times indicated by m->count
265 static struct ctdb_rec_data *db_ctdb_marshall_loop_next(struct ctdb_marshall_buffer *m, struct ctdb_rec_data *r,
267 struct ctdb_ltdb_header *header,
268 TDB_DATA *key, TDB_DATA *data)
271 r = (struct ctdb_rec_data *)&m->data[0];
273 r = (struct ctdb_rec_data *)(r->length + (uint8_t *)r);
281 key->dptr = &r->data[0];
282 key->dsize = r->keylen;
285 data->dptr = &r->data[r->keylen];
286 data->dsize = r->datalen;
287 if (header != NULL) {
288 data->dptr += sizeof(*header);
289 data->dsize -= sizeof(*header);
293 if (header != NULL) {
294 if (r->datalen < sizeof(*header)) {
297 *header = *(struct ctdb_ltdb_header *)&r->data[r->keylen];
304 * CTDB transaction destructor
306 static int db_ctdb_transaction_destructor(struct db_ctdb_transaction_handle *h)
310 status = g_lock_unlock(h->ctx->lock_ctx, h->lock_name);
311 if (!NT_STATUS_IS_OK(status)) {
312 DEBUG(0, ("g_lock_unlock failed: %s\n", nt_errstr(status)));
319 * CTDB dbwrap API: transaction_start function
320 * starts a transaction on a persistent database
322 static int db_ctdb_transaction_start(struct db_context *db)
324 struct db_ctdb_transaction_handle *h;
326 struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
329 if (!db->persistent) {
330 DEBUG(0,("transactions not supported on non-persistent database 0x%08x\n",
335 if (ctx->transaction) {
336 ctx->transaction->nesting++;
340 h = talloc_zero(db, struct db_ctdb_transaction_handle);
342 DEBUG(0,(__location__ " oom for transaction handle\n"));
348 h->lock_name = talloc_asprintf(h, "transaction_db_0x%08x",
349 (unsigned int)ctx->db_id);
350 if (h->lock_name == NULL) {
351 DEBUG(0, ("talloc_asprintf failed\n"));
357 * Wait a day, i.e. forever...
359 status = g_lock_lock(ctx->lock_ctx, h->lock_name, G_LOCK_WRITE,
360 timeval_set(86400, 0));
361 if (!NT_STATUS_IS_OK(status)) {
362 DEBUG(0, ("g_lock_lock failed: %s\n", nt_errstr(status)));
367 talloc_set_destructor(h, db_ctdb_transaction_destructor);
369 ctx->transaction = h;
371 DEBUG(5,(__location__ " Started transaction on db 0x%08x\n", ctx->db_id));
376 static bool pull_newest_from_marshall_buffer(struct ctdb_marshall_buffer *buf,
378 struct ctdb_ltdb_header *pheader,
382 struct ctdb_rec_data *rec = NULL;
383 struct ctdb_ltdb_header h;
393 * Walk the list of records written during this
394 * transaction. If we want to read one we have already
395 * written, return the last written sample. Thus we do not do
396 * a "break;" for the first hit, this record might have been
400 for (i=0; i<buf->count; i++) {
401 TDB_DATA tkey, tdata;
404 rec = db_ctdb_marshall_loop_next(buf, rec, &reqid, &h, &tkey,
410 if (tdb_data_equal(key, tkey)) {
421 data.dptr = (uint8_t *)talloc_memdup(mem_ctx, data.dptr,
423 if ((data.dsize != 0) && (data.dptr == NULL)) {
429 if (pheader != NULL) {
437 fetch a record inside a transaction
439 static int db_ctdb_transaction_fetch(struct db_ctdb_ctx *db,
441 TDB_DATA key, TDB_DATA *data)
443 struct db_ctdb_transaction_handle *h = db->transaction;
447 found = pull_newest_from_marshall_buffer(h->m_write, key, NULL,
453 status = db_ctdb_ltdb_fetch(h->ctx, key, NULL, mem_ctx, data);
455 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
457 } else if (!NT_STATUS_IS_OK(status)) {
461 h->m_all = db_ctdb_marshall_add(h, h->m_all, h->ctx->db_id, 1, key,
463 if (h->m_all == NULL) {
464 DEBUG(0,(__location__ " Failed to add to marshalling "
467 talloc_free(data->dptr);
475 static NTSTATUS db_ctdb_store_transaction(struct db_record *rec, TDB_DATA data, int flag);
476 static NTSTATUS db_ctdb_delete_transaction(struct db_record *rec);
478 static struct db_record *db_ctdb_fetch_locked_transaction(struct db_ctdb_ctx *ctx,
482 struct db_record *result;
485 if (!(result = talloc(mem_ctx, struct db_record))) {
486 DEBUG(0, ("talloc failed\n"));
490 result->private_data = ctx->transaction;
492 result->key.dsize = key.dsize;
493 result->key.dptr = (uint8 *)talloc_memdup(result, key.dptr, key.dsize);
494 if (result->key.dptr == NULL) {
495 DEBUG(0, ("talloc failed\n"));
500 result->store = db_ctdb_store_transaction;
501 result->delete_rec = db_ctdb_delete_transaction;
503 if (pull_newest_from_marshall_buffer(ctx->transaction->m_write, key,
504 NULL, result, &result->value)) {
508 ctdb_data = tdb_fetch(ctx->wtdb->tdb, key);
509 if (ctdb_data.dptr == NULL) {
510 /* create the record */
511 result->value = tdb_null;
515 result->value.dsize = ctdb_data.dsize - sizeof(struct ctdb_ltdb_header);
516 result->value.dptr = NULL;
518 if ((result->value.dsize != 0)
519 && !(result->value.dptr = (uint8 *)talloc_memdup(
520 result, ctdb_data.dptr + sizeof(struct ctdb_ltdb_header),
521 result->value.dsize))) {
522 DEBUG(0, ("talloc failed\n"));
526 SAFE_FREE(ctdb_data.dptr);
531 static int db_ctdb_record_destructor(struct db_record **recp)
533 struct db_record *rec = talloc_get_type_abort(*recp, struct db_record);
534 struct db_ctdb_transaction_handle *h = talloc_get_type_abort(
535 rec->private_data, struct db_ctdb_transaction_handle);
536 int ret = h->ctx->db->transaction_commit(h->ctx->db);
538 DEBUG(0,(__location__ " transaction_commit failed\n"));
544 auto-create a transaction for persistent databases
546 static struct db_record *db_ctdb_fetch_locked_persistent(struct db_ctdb_ctx *ctx,
551 struct db_record *rec, **recp;
553 res = db_ctdb_transaction_start(ctx->db);
558 rec = db_ctdb_fetch_locked_transaction(ctx, mem_ctx, key);
560 ctx->db->transaction_cancel(ctx->db);
564 /* destroy this transaction when we release the lock */
565 recp = talloc(rec, struct db_record *);
567 ctx->db->transaction_cancel(ctx->db);
572 talloc_set_destructor(recp, db_ctdb_record_destructor);
578 stores a record inside a transaction
580 static int db_ctdb_transaction_store(struct db_ctdb_transaction_handle *h,
581 TDB_DATA key, TDB_DATA data)
583 TALLOC_CTX *tmp_ctx = talloc_new(h);
585 struct ctdb_ltdb_header header;
589 /* we need the header so we can update the RSN */
591 if (!pull_newest_from_marshall_buffer(h->m_write, key, &header,
594 rec = tdb_fetch(h->ctx->wtdb->tdb, key);
596 if (rec.dptr != NULL) {
597 memcpy(&header, rec.dptr,
598 sizeof(struct ctdb_ltdb_header));
599 rec.dsize -= sizeof(struct ctdb_ltdb_header);
602 * a special case, we are writing the same
603 * data that is there now
605 if (data.dsize == rec.dsize &&
607 rec.dptr + sizeof(struct ctdb_ltdb_header),
610 talloc_free(tmp_ctx);
617 header.dmaster = get_my_vnn();
620 h->m_all = db_ctdb_marshall_add(h, h->m_all, h->ctx->db_id, 0, key,
622 if (h->m_all == NULL) {
623 DEBUG(0,(__location__ " Failed to add to marshalling "
625 talloc_free(tmp_ctx);
629 h->m_write = db_ctdb_marshall_add(h, h->m_write, h->ctx->db_id, 0, key, &header, data);
630 if (h->m_write == NULL) {
631 DEBUG(0,(__location__ " Failed to add to marshalling record\n"));
632 talloc_free(tmp_ctx);
636 talloc_free(tmp_ctx);
642 a record store inside a transaction
644 static NTSTATUS db_ctdb_store_transaction(struct db_record *rec, TDB_DATA data, int flag)
646 struct db_ctdb_transaction_handle *h = talloc_get_type_abort(
647 rec->private_data, struct db_ctdb_transaction_handle);
650 ret = db_ctdb_transaction_store(h, rec->key, data);
652 return tdb_error_to_ntstatus(h->ctx->wtdb->tdb);
658 a record delete inside a transaction
660 static NTSTATUS db_ctdb_delete_transaction(struct db_record *rec)
662 struct db_ctdb_transaction_handle *h = talloc_get_type_abort(
663 rec->private_data, struct db_ctdb_transaction_handle);
666 ret = db_ctdb_transaction_store(h, rec->key, tdb_null);
668 return tdb_error_to_ntstatus(h->ctx->wtdb->tdb);
676 static int db_ctdb_transaction_commit(struct db_context *db)
678 struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
682 struct db_ctdb_transaction_handle *h = ctx->transaction;
685 DEBUG(0,(__location__ " transaction commit with no open transaction on db 0x%08x\n", ctx->db_id));
689 if (h->nested_cancel) {
690 db->transaction_cancel(db);
691 DEBUG(5,(__location__ " Failed transaction commit after nested cancel\n"));
695 if (h->nesting != 0) {
700 DEBUG(5,(__location__ " Commit transaction on db 0x%08x\n", ctx->db_id));
703 if (h->m_write == NULL) {
704 /* no changes were made, potentially after a retry */
708 /* tell ctdbd to commit to the other nodes */
709 rets = ctdbd_control_local(messaging_ctdbd_connection(),
710 CTDB_CONTROL_TRANS3_COMMIT,
712 db_ctdb_marshall_finish(h->m_write),
713 NULL, NULL, &status);
714 if (!NT_STATUS_IS_OK(rets) || status != 0) {
717 * check the database sequence number and
718 * compare it to the seqnum after applying the
719 * marshall buffer. If it is the same: return success.
725 h->ctx->transaction = NULL;
734 static int db_ctdb_transaction_cancel(struct db_context *db)
736 struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
738 struct db_ctdb_transaction_handle *h = ctx->transaction;
741 DEBUG(0,(__location__ " transaction cancel with no open transaction on db 0x%08x\n", ctx->db_id));
745 if (h->nesting != 0) {
747 h->nested_cancel = true;
751 DEBUG(5,(__location__ " Cancel transaction on db 0x%08x\n", ctx->db_id));
753 ctx->transaction = NULL;
759 static NTSTATUS db_ctdb_store(struct db_record *rec, TDB_DATA data, int flag)
761 struct db_ctdb_rec *crec = talloc_get_type_abort(
762 rec->private_data, struct db_ctdb_rec);
764 return db_ctdb_ltdb_store(crec->ctdb_ctx, rec->key, &(crec->header), data);
769 static NTSTATUS db_ctdb_delete(struct db_record *rec)
774 * We have to store the header with empty data. TODO: Fix the
780 return db_ctdb_store(rec, data, 0);
784 static int db_ctdb_record_destr(struct db_record* data)
786 struct db_ctdb_rec *crec = talloc_get_type_abort(
787 data->private_data, struct db_ctdb_rec);
789 DEBUG(10, (DEBUGLEVEL > 10
790 ? "Unlocking db %u key %s\n"
791 : "Unlocking db %u key %.20s\n",
792 (int)crec->ctdb_ctx->db_id,
793 hex_encode_talloc(data, (unsigned char *)data->key.dptr,
796 if (tdb_chainunlock(crec->ctdb_ctx->wtdb->tdb, data->key) != 0) {
797 DEBUG(0, ("tdb_chainunlock failed\n"));
804 static struct db_record *fetch_locked_internal(struct db_ctdb_ctx *ctx,
809 struct db_record *result;
810 struct db_ctdb_rec *crec;
813 int migrate_attempts = 0;
815 if (!(result = talloc(mem_ctx, struct db_record))) {
816 DEBUG(0, ("talloc failed\n"));
820 if (!(crec = TALLOC_ZERO_P(result, struct db_ctdb_rec))) {
821 DEBUG(0, ("talloc failed\n"));
826 result->private_data = (void *)crec;
827 crec->ctdb_ctx = ctx;
829 result->key.dsize = key.dsize;
830 result->key.dptr = (uint8 *)talloc_memdup(result, key.dptr, key.dsize);
831 if (result->key.dptr == NULL) {
832 DEBUG(0, ("talloc failed\n"));
838 * Do a blocking lock on the record
842 if (DEBUGLEVEL >= 10) {
843 char *keystr = hex_encode_talloc(result, key.dptr, key.dsize);
844 DEBUG(10, (DEBUGLEVEL > 10
845 ? "Locking db %u key %s\n"
846 : "Locking db %u key %.20s\n",
847 (int)crec->ctdb_ctx->db_id, keystr));
851 if (tdb_chainlock(ctx->wtdb->tdb, key) != 0) {
852 DEBUG(3, ("tdb_chainlock failed\n"));
857 result->store = db_ctdb_store;
858 result->delete_rec = db_ctdb_delete;
859 talloc_set_destructor(result, db_ctdb_record_destr);
861 ctdb_data = tdb_fetch(ctx->wtdb->tdb, key);
864 * See if we have a valid record and we are the dmaster. If so, we can
865 * take the shortcut and just return it.
868 if ((ctdb_data.dptr == NULL) ||
869 (ctdb_data.dsize < sizeof(struct ctdb_ltdb_header)) ||
870 ((struct ctdb_ltdb_header *)ctdb_data.dptr)->dmaster != get_my_vnn()
872 || (random() % 2 != 0)
875 SAFE_FREE(ctdb_data.dptr);
876 tdb_chainunlock(ctx->wtdb->tdb, key);
877 talloc_set_destructor(result, NULL);
879 migrate_attempts += 1;
881 DEBUG(10, ("ctdb_data.dptr = %p, dmaster = %u (%u)\n",
882 ctdb_data.dptr, ctdb_data.dptr ?
883 ((struct ctdb_ltdb_header *)ctdb_data.dptr)->dmaster : -1,
886 status = ctdbd_migrate(messaging_ctdbd_connection(),ctx->db_id, key);
887 if (!NT_STATUS_IS_OK(status)) {
888 DEBUG(5, ("ctdb_migrate failed: %s\n",
893 /* now its migrated, try again */
897 if (migrate_attempts > 10) {
898 DEBUG(0, ("db_ctdb_fetch_locked needed %d attempts\n",
902 memcpy(&crec->header, ctdb_data.dptr, sizeof(crec->header));
904 result->value.dsize = ctdb_data.dsize - sizeof(crec->header);
905 result->value.dptr = NULL;
907 if ((result->value.dsize != 0)
908 && !(result->value.dptr = (uint8 *)talloc_memdup(
909 result, ctdb_data.dptr + sizeof(crec->header),
910 result->value.dsize))) {
911 DEBUG(0, ("talloc failed\n"));
915 SAFE_FREE(ctdb_data.dptr);
920 static struct db_record *db_ctdb_fetch_locked(struct db_context *db,
924 struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
927 if (ctx->transaction != NULL) {
928 return db_ctdb_fetch_locked_transaction(ctx, mem_ctx, key);
931 if (db->persistent) {
932 return db_ctdb_fetch_locked_persistent(ctx, mem_ctx, key);
935 return fetch_locked_internal(ctx, mem_ctx, key, db->persistent);
939 fetch (unlocked, no migration) operation on ctdb
941 static int db_ctdb_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
942 TDB_DATA key, TDB_DATA *data)
944 struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
949 if (ctx->transaction) {
950 return db_ctdb_transaction_fetch(ctx, mem_ctx, key, data);
953 /* try a direct fetch */
954 ctdb_data = tdb_fetch(ctx->wtdb->tdb, key);
957 * See if we have a valid record and we are the dmaster. If so, we can
958 * take the shortcut and just return it.
959 * we bypass the dmaster check for persistent databases
961 if ((ctdb_data.dptr != NULL) &&
962 (ctdb_data.dsize >= sizeof(struct ctdb_ltdb_header)) &&
964 ((struct ctdb_ltdb_header *)ctdb_data.dptr)->dmaster == get_my_vnn())) {
965 /* we are the dmaster - avoid the ctdb protocol op */
967 data->dsize = ctdb_data.dsize - sizeof(struct ctdb_ltdb_header);
968 if (data->dsize == 0) {
969 SAFE_FREE(ctdb_data.dptr);
974 data->dptr = (uint8 *)talloc_memdup(
975 mem_ctx, ctdb_data.dptr+sizeof(struct ctdb_ltdb_header),
978 SAFE_FREE(ctdb_data.dptr);
980 if (data->dptr == NULL) {
986 SAFE_FREE(ctdb_data.dptr);
988 /* we weren't able to get it locally - ask ctdb to fetch it for us */
989 status = ctdbd_fetch(messaging_ctdbd_connection(),ctx->db_id, key, mem_ctx, data);
990 if (!NT_STATUS_IS_OK(status)) {
991 DEBUG(5, ("ctdbd_fetch failed: %s\n", nt_errstr(status)));
998 struct traverse_state {
999 struct db_context *db;
1000 int (*fn)(struct db_record *rec, void *private_data);
1004 static void traverse_callback(TDB_DATA key, TDB_DATA data, void *private_data)
1006 struct traverse_state *state = (struct traverse_state *)private_data;
1007 struct db_record *rec;
1008 TALLOC_CTX *tmp_ctx = talloc_new(state->db);
1009 /* we have to give them a locked record to prevent races */
1010 rec = db_ctdb_fetch_locked(state->db, tmp_ctx, key);
1011 if (rec && rec->value.dsize > 0) {
1012 state->fn(rec, state->private_data);
1014 talloc_free(tmp_ctx);
1017 static int traverse_persistent_callback(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
1020 struct traverse_state *state = (struct traverse_state *)private_data;
1021 struct db_record *rec;
1022 TALLOC_CTX *tmp_ctx = talloc_new(state->db);
1024 /* we have to give them a locked record to prevent races */
1025 rec = db_ctdb_fetch_locked(state->db, tmp_ctx, kbuf);
1026 if (rec && rec->value.dsize > 0) {
1027 ret = state->fn(rec, state->private_data);
1029 talloc_free(tmp_ctx);
1033 static int db_ctdb_traverse(struct db_context *db,
1034 int (*fn)(struct db_record *rec,
1035 void *private_data),
1038 struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
1039 struct db_ctdb_ctx);
1040 struct traverse_state state;
1044 state.private_data = private_data;
1046 if (db->persistent) {
1047 /* for persistent databases we don't need to do a ctdb traverse,
1048 we can do a faster local traverse */
1049 return tdb_traverse(ctx->wtdb->tdb, traverse_persistent_callback, &state);
1053 ctdbd_traverse(ctx->db_id, traverse_callback, &state);
1057 static NTSTATUS db_ctdb_store_deny(struct db_record *rec, TDB_DATA data, int flag)
1059 return NT_STATUS_MEDIA_WRITE_PROTECTED;
1062 static NTSTATUS db_ctdb_delete_deny(struct db_record *rec)
1064 return NT_STATUS_MEDIA_WRITE_PROTECTED;
1067 static void traverse_read_callback(TDB_DATA key, TDB_DATA data, void *private_data)
1069 struct traverse_state *state = (struct traverse_state *)private_data;
1070 struct db_record rec;
1073 rec.store = db_ctdb_store_deny;
1074 rec.delete_rec = db_ctdb_delete_deny;
1075 rec.private_data = state->db;
1076 state->fn(&rec, state->private_data);
1079 static int traverse_persistent_callback_read(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
1082 struct traverse_state *state = (struct traverse_state *)private_data;
1083 struct db_record rec;
1086 rec.store = db_ctdb_store_deny;
1087 rec.delete_rec = db_ctdb_delete_deny;
1088 rec.private_data = state->db;
1090 if (rec.value.dsize <= sizeof(struct ctdb_ltdb_header)) {
1091 /* a deleted record */
1094 rec.value.dsize -= sizeof(struct ctdb_ltdb_header);
1095 rec.value.dptr += sizeof(struct ctdb_ltdb_header);
1097 return state->fn(&rec, state->private_data);
1100 static int db_ctdb_traverse_read(struct db_context *db,
1101 int (*fn)(struct db_record *rec,
1102 void *private_data),
1105 struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
1106 struct db_ctdb_ctx);
1107 struct traverse_state state;
1111 state.private_data = private_data;
1113 if (db->persistent) {
1114 /* for persistent databases we don't need to do a ctdb traverse,
1115 we can do a faster local traverse */
1116 return tdb_traverse_read(ctx->wtdb->tdb, traverse_persistent_callback_read, &state);
1119 ctdbd_traverse(ctx->db_id, traverse_read_callback, &state);
1123 static int db_ctdb_get_seqnum(struct db_context *db)
1125 struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
1126 struct db_ctdb_ctx);
1127 return tdb_get_seqnum(ctx->wtdb->tdb);
1130 static int db_ctdb_get_flags(struct db_context *db)
1132 struct db_ctdb_ctx *ctx = talloc_get_type_abort(db->private_data,
1133 struct db_ctdb_ctx);
1134 return tdb_get_flags(ctx->wtdb->tdb);
1137 struct db_context *db_open_ctdb(TALLOC_CTX *mem_ctx,
1139 int hash_size, int tdb_flags,
1140 int open_flags, mode_t mode)
1142 struct db_context *result;
1143 struct db_ctdb_ctx *db_ctdb;
1145 struct ctdbd_connection *conn;
1147 if (!lp_clustering()) {
1148 DEBUG(10, ("Clustering disabled -- no ctdb\n"));
1152 if (!(result = TALLOC_ZERO_P(mem_ctx, struct db_context))) {
1153 DEBUG(0, ("talloc failed\n"));
1154 TALLOC_FREE(result);
1158 if (!(db_ctdb = TALLOC_P(result, struct db_ctdb_ctx))) {
1159 DEBUG(0, ("talloc failed\n"));
1160 TALLOC_FREE(result);
1164 db_ctdb->transaction = NULL;
1165 db_ctdb->db = result;
1167 conn = messaging_ctdbd_connection();
1169 if (!NT_STATUS_IS_OK(ctdbd_db_attach(conn, name, &db_ctdb->db_id, tdb_flags))) {
1170 DEBUG(0, ("ctdbd_db_attach failed for %s\n", name));
1171 TALLOC_FREE(result);
1175 db_path = ctdbd_dbpath(conn, db_ctdb, db_ctdb->db_id);
1177 result->persistent = ((tdb_flags & TDB_CLEAR_IF_FIRST) == 0);
1179 /* only pass through specific flags */
1180 tdb_flags &= TDB_SEQNUM;
1182 /* honor permissions if user has specified O_CREAT */
1183 if (open_flags & O_CREAT) {
1184 chmod(db_path, mode);
1187 db_ctdb->wtdb = tdb_wrap_open(db_ctdb, db_path, hash_size, tdb_flags, O_RDWR, 0);
1188 if (db_ctdb->wtdb == NULL) {
1189 DEBUG(0, ("Could not open tdb %s: %s\n", db_path, strerror(errno)));
1190 TALLOC_FREE(result);
1193 talloc_free(db_path);
1195 if (result->persistent) {
1196 db_ctdb->lock_ctx = g_lock_ctx_init(db_ctdb,
1197 ctdb_conn_msg_ctx(conn));
1198 if (db_ctdb->lock_ctx == NULL) {
1199 DEBUG(0, ("g_lock_ctx_init failed\n"));
1200 TALLOC_FREE(result);
1205 result->private_data = (void *)db_ctdb;
1206 result->fetch_locked = db_ctdb_fetch_locked;
1207 result->fetch = db_ctdb_fetch;
1208 result->traverse = db_ctdb_traverse;
1209 result->traverse_read = db_ctdb_traverse_read;
1210 result->get_seqnum = db_ctdb_get_seqnum;
1211 result->get_flags = db_ctdb_get_flags;
1212 result->transaction_start = db_ctdb_transaction_start;
1213 result->transaction_commit = db_ctdb_transaction_commit;
1214 result->transaction_cancel = db_ctdb_transaction_cancel;
1216 DEBUG(3,("db_open_ctdb: opened database '%s' with dbid 0x%x\n",
1217 name, db_ctdb->db_id));