2 Unix SMB/CIFS implementation.
3 Database interface wrapper
4 Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2006
6 Major code contributions from Aleksey Fedoseev (fedoseev@ru.ibm.com)
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "lib/util/debug.h"
24 #include "lib/util/fault.h"
25 #include "lib/util/talloc_stack.h"
26 #include "dbwrap/dbwrap.h"
27 #include "dbwrap/dbwrap_private.h"
28 #include "lib/util/util_tdb.h"
29 #include "lib/util/tevent_ntstatus.h"
32 * Fall back using fetch if no genuine exists operation is provided
35 static int dbwrap_fallback_exists(struct db_context *db, TDB_DATA key)
37 NTSTATUS status = dbwrap_parse_record(db, key, NULL, NULL);
38 return NT_STATUS_IS_OK(status) ? 1 : 0;
41 static int delete_record(struct db_record *rec, void *data)
43 NTSTATUS status = dbwrap_record_delete(rec);
44 return NT_STATUS_IS_OK(status) ? 0 : -1;
48 * Fallback wipe implementation using traverse and delete if no genuine
49 * wipe operation is provided
51 static int dbwrap_fallback_wipe(struct db_context *db)
53 NTSTATUS status = dbwrap_trans_traverse(db, delete_record, NULL);
54 return NT_STATUS_IS_OK(status) ? 0 : -1;
57 static int do_nothing(struct db_record *rec, void *unused)
63 * Fallback check operation: just traverse.
65 static int dbwrap_fallback_check(struct db_context *db)
67 NTSTATUS status = dbwrap_traverse_read(db, do_nothing, NULL, NULL);
68 return NT_STATUS_IS_OK(status) ? 0 : -1;
72 * Wrapper functions for the backend methods
75 TDB_DATA dbwrap_record_get_key(const struct db_record *rec)
80 TDB_DATA dbwrap_record_get_value(const struct db_record *rec)
85 NTSTATUS dbwrap_record_storev(struct db_record *rec,
86 const TDB_DATA *dbufs, int num_dbufs, int flags)
90 status = rec->storev(rec, dbufs, num_dbufs, flags);
91 if (!NT_STATUS_IS_OK(status)) {
97 NTSTATUS dbwrap_record_store(struct db_record *rec, TDB_DATA data, int flags)
99 return dbwrap_record_storev(rec, &data, 1, flags);
102 NTSTATUS dbwrap_record_delete(struct db_record *rec)
106 status = rec->delete_rec(rec);
107 if (!NT_STATUS_IS_OK(status)) {
113 struct dbwrap_lock_order_state {
114 struct db_context **locked_dbs;
115 struct db_context *db;
118 static void debug_lock_order(int level, struct db_context *dbs[])
121 DEBUG(level, ("lock order: "));
122 for (i=0; i<DBWRAP_LOCK_ORDER_MAX; i++) {
123 DEBUGADD(level, (" %d:%s", i + 1, dbs[i] ? dbs[i]->name : "<none>"));
125 DEBUGADD(level, ("\n"));
128 static int dbwrap_lock_order_state_destructor(
129 struct dbwrap_lock_order_state *s)
131 int idx = s->db->lock_order - 1;
133 DEBUG(5, ("release lock order %d for %s\n",
134 (int)s->db->lock_order, s->db->name));
136 if (s->locked_dbs[idx] != s->db) {
137 DEBUG(0, ("locked db at lock order %d is %s, expected %s\n",
138 idx + 1, s->locked_dbs[idx]->name, s->db->name));
139 debug_lock_order(0, s->locked_dbs);
140 smb_panic("inconsistent lock_order\n");
143 s->locked_dbs[idx] = NULL;
145 debug_lock_order(10, s->locked_dbs);
151 static struct dbwrap_lock_order_state *dbwrap_check_lock_order(
152 struct db_context *db, TALLOC_CTX *mem_ctx)
155 static struct db_context *locked_dbs[DBWRAP_LOCK_ORDER_MAX];
156 struct dbwrap_lock_order_state *state = NULL;
158 if (!DBWRAP_LOCK_ORDER_VALID(db->lock_order)) {
159 DEBUG(0,("Invalid lock order %d of %s\n",
160 (int)db->lock_order, db->name));
161 smb_panic("invalid lock_order\n");
165 DEBUG(5, ("check lock order %d for %s\n",
166 (int)db->lock_order, db->name));
169 for (idx=db->lock_order - 1; idx < DBWRAP_LOCK_ORDER_MAX; idx++) {
170 if (locked_dbs[idx] != NULL) {
171 DEBUG(0, ("Lock order violation: Trying %s at %d while %s at %d is locked\n",
172 db->name, (int)db->lock_order, locked_dbs[idx]->name, idx + 1));
173 debug_lock_order(0, locked_dbs);
174 smb_panic("invalid lock_order");
179 state = talloc(mem_ctx, struct dbwrap_lock_order_state);
181 DEBUG(1, ("talloc failed\n"));
185 state->locked_dbs = locked_dbs;
186 talloc_set_destructor(state, dbwrap_lock_order_state_destructor);
188 locked_dbs[db->lock_order - 1] = db;
190 debug_lock_order(10, locked_dbs);
195 static struct db_record *dbwrap_fetch_locked_internal(
196 struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key,
197 struct db_record *(*db_fn)(struct db_context *db, TALLOC_CTX *mem_ctx,
200 struct db_record *rec;
201 struct dbwrap_lock_order_state *lock_order = NULL;
203 if (db->lock_order != DBWRAP_LOCK_ORDER_NONE) {
204 lock_order = dbwrap_check_lock_order(db, mem_ctx);
205 if (lock_order == NULL) {
209 rec = db_fn(db, mem_ctx, key);
211 TALLOC_FREE(lock_order);
214 (void)talloc_steal(rec, lock_order);
219 struct db_record *dbwrap_fetch_locked(struct db_context *db,
223 return dbwrap_fetch_locked_internal(db, mem_ctx, key,
227 struct db_record *dbwrap_try_fetch_locked(struct db_context *db,
231 return dbwrap_fetch_locked_internal(
234 ? db->try_fetch_locked : db->fetch_locked);
237 struct db_context *dbwrap_record_get_db(struct db_record *rec)
242 struct dbwrap_fetch_state {
247 static void dbwrap_fetch_parser(TDB_DATA key, TDB_DATA data,
250 struct dbwrap_fetch_state *state =
251 (struct dbwrap_fetch_state *)private_data;
253 state->data.dsize = data.dsize;
254 state->data.dptr = (uint8_t *)talloc_memdup(state->mem_ctx, data.dptr,
258 NTSTATUS dbwrap_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
259 TDB_DATA key, TDB_DATA *value)
261 struct dbwrap_fetch_state state;
265 return NT_STATUS_INVALID_PARAMETER;
268 state.mem_ctx = mem_ctx;
270 status = dbwrap_parse_record(db, key, dbwrap_fetch_parser, &state);
271 if (!NT_STATUS_IS_OK(status)) {
274 if ((state.data.dsize != 0) && (state.data.dptr == NULL)) {
275 return NT_STATUS_NO_MEMORY;
281 bool dbwrap_exists(struct db_context *db, TDB_DATA key)
284 if (db->exists != NULL) {
285 result = db->exists(db, key);
287 result = dbwrap_fallback_exists(db,key);
289 return (result == 1);
292 NTSTATUS dbwrap_store(struct db_context *db, TDB_DATA key,
293 TDB_DATA data, int flags)
295 struct db_record *rec;
297 TALLOC_CTX *frame = talloc_stackframe();
299 rec = dbwrap_fetch_locked(db, frame, key);
302 return NT_STATUS_NO_MEMORY;
305 status = dbwrap_record_store(rec, data, flags);
310 NTSTATUS dbwrap_delete(struct db_context *db, TDB_DATA key)
312 struct db_record *rec;
314 TALLOC_CTX *frame = talloc_stackframe();
316 rec = dbwrap_fetch_locked(db, frame, key);
319 return NT_STATUS_NO_MEMORY;
321 status = dbwrap_record_delete(rec);
326 NTSTATUS dbwrap_traverse(struct db_context *db,
327 int (*f)(struct db_record*, void*),
331 int ret = db->traverse(db, f, private_data);
334 return NT_STATUS_INTERNAL_DB_CORRUPTION;
344 NTSTATUS dbwrap_traverse_read(struct db_context *db,
345 int (*f)(struct db_record*, void*),
349 int ret = db->traverse_read(db, f, private_data);
352 return NT_STATUS_INTERNAL_DB_CORRUPTION;
362 static void dbwrap_null_parser(TDB_DATA key, TDB_DATA val, void* data)
367 NTSTATUS dbwrap_parse_record(struct db_context *db, TDB_DATA key,
368 void (*parser)(TDB_DATA key, TDB_DATA data,
372 if (parser == NULL) {
373 parser = dbwrap_null_parser;
375 return db->parse_record(db, key, parser, private_data);
378 struct dbwrap_parse_record_state {
379 struct db_context *db;
384 static void dbwrap_parse_record_done(struct tevent_req *subreq);
386 struct tevent_req *dbwrap_parse_record_send(
388 struct tevent_context *ev,
389 struct db_context *db,
391 void (*parser)(TDB_DATA key, TDB_DATA data, void *private_data),
393 enum dbwrap_req_state *req_state)
395 struct tevent_req *req = NULL;
396 struct tevent_req *subreq = NULL;
397 struct dbwrap_parse_record_state *state = NULL;
400 req = tevent_req_create(mem_ctx, &state, struct dbwrap_parse_record_state);
402 *req_state = DBWRAP_REQ_ERROR;
406 *state = (struct dbwrap_parse_record_state) {
410 if (parser == NULL) {
411 parser = dbwrap_null_parser;
414 *req_state = DBWRAP_REQ_INIT;
416 if (db->parse_record_send == NULL) {
418 * Backend doesn't implement async version, call sync one
420 status = db->parse_record(db, key, parser, private_data);
421 if (tevent_req_nterror(req, status)) {
422 *req_state = DBWRAP_REQ_DONE;
423 return tevent_req_post(req, ev);
426 *req_state = DBWRAP_REQ_DONE;
427 tevent_req_done(req);
428 return tevent_req_post(req, ev);
432 * Copy the key into our state ensuring the key data buffer is always
433 * available to the all dbwrap backend over the entire lifetime of the
434 * async request. Otherwise the caller might have free'd the key buffer.
436 if (key.dsize > sizeof(state->_keybuf)) {
437 state->key.dptr = talloc_memdup(state, key.dptr, key.dsize);
438 if (tevent_req_nomem(state->key.dptr, req)) {
439 return tevent_req_post(req, ev);
442 memcpy(state->_keybuf, key.dptr, key.dsize);
443 state->key.dptr = state->_keybuf;
445 state->key.dsize = key.dsize;
447 subreq = db->parse_record_send(state,
454 if (tevent_req_nomem(subreq, req)) {
455 *req_state = DBWRAP_REQ_ERROR;
456 return tevent_req_post(req, ev);
459 tevent_req_set_callback(subreq,
460 dbwrap_parse_record_done,
465 static void dbwrap_parse_record_done(struct tevent_req *subreq)
467 struct tevent_req *req = tevent_req_callback_data(
468 subreq, struct tevent_req);
469 struct dbwrap_parse_record_state *state = tevent_req_data(
470 req, struct dbwrap_parse_record_state);
473 status = state->db->parse_record_recv(subreq);
475 if (!NT_STATUS_IS_OK(status)) {
476 tevent_req_nterror(req, status);
480 tevent_req_done(req);
484 NTSTATUS dbwrap_parse_record_recv(struct tevent_req *req)
486 return tevent_req_simple_recv_ntstatus(req);
489 int dbwrap_wipe(struct db_context *db)
491 if (db->wipe == NULL) {
492 return dbwrap_fallback_wipe(db);
497 int dbwrap_check(struct db_context *db)
499 if (db->check == NULL) {
500 return dbwrap_fallback_check(db);
502 return db->check(db);
505 int dbwrap_get_seqnum(struct db_context *db)
507 return db->get_seqnum(db);
510 int dbwrap_transaction_start(struct db_context *db)
512 if (!db->persistent) {
514 * dbwrap_ctdb has two different data models for persistent
515 * and non-persistent databases. Transactions are supported
516 * only for the persistent databases. This check is here to
517 * prevent breakages of the cluster case, autobuild at this
518 * point only tests non-clustered Samba. Before removing this
519 * check, please make sure that this facility has also been
520 * added to dbwrap_ctdb.
524 DEBUG(1, ("transactions not supported on non-persistent "
525 "database %s\n", db->name));
528 return db->transaction_start(db);
531 NTSTATUS dbwrap_transaction_start_nonblock(struct db_context *db)
533 if (db->transaction_start_nonblock) {
534 return db->transaction_start_nonblock(db);
536 return dbwrap_transaction_start(db) == 0 ? NT_STATUS_OK
537 : NT_STATUS_UNSUCCESSFUL;
541 int dbwrap_transaction_commit(struct db_context *db)
543 return db->transaction_commit(db);
546 int dbwrap_transaction_cancel(struct db_context *db)
548 return db->transaction_cancel(db);
551 size_t dbwrap_db_id(struct db_context *db, uint8_t *id, size_t idlen)
553 return db->id(db, id, idlen);
556 bool dbwrap_is_persistent(struct db_context *db)
558 return db->persistent;
561 const char *dbwrap_name(struct db_context *db)
566 static ssize_t tdb_data_buf(const TDB_DATA *dbufs, int num_dbufs,
567 uint8_t *buf, size_t buflen)
573 for (i=0; i<num_dbufs; i++) {
574 size_t thislen = dbufs[i].dsize;
577 tmp = needed + thislen;
584 if (needed <= buflen) {
585 memcpy(p, dbufs[i].dptr, thislen);
594 TDB_DATA dbwrap_merge_dbufs(TALLOC_CTX *mem_ctx,
595 const TDB_DATA *dbufs, int num_dbufs)
597 ssize_t len = tdb_data_buf(dbufs, num_dbufs, NULL, 0);
601 return (TDB_DATA) {0};
604 buf = talloc_array(mem_ctx, uint8_t, len);
606 return (TDB_DATA) {0};
609 tdb_data_buf(dbufs, num_dbufs, buf, len);
611 return (TDB_DATA) { .dptr = buf, .dsize = len };