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s3:smbd: pass smbXsrv_connection to smbd_[un]lock_socket()
[Samba.git] / ctdb / server / ctdb_ltdb_server.c
blob55abf1f54400c74f849eedbd1fc5e121b8b9370d
1 /*
2 ctdb ltdb code - server side
3
4 Copyright (C) Andrew Tridgell 2007
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "includes.h"
21 #include "tdb.h"
22 #include "system/network.h"
23 #include "system/filesys.h"
24 #include "system/dir.h"
25 #include "system/time.h"
26 #include "../include/ctdb_private.h"
27 #include "../common/rb_tree.h"
28 #include "db_wrap.h"
29 #include "lib/util/dlinklist.h"
30 #include <ctype.h>
31
32 #define PERSISTENT_HEALTH_TDB "persistent_health.tdb"
33
34 /**
35 * write a record to a normal database
36 *
37 * This is the server-variant of the ctdb_ltdb_store function.
38 * It contains logic to determine whether a record should be
39 * stored or deleted. It also sends SCHEDULE_FOR_DELETION
40 * controls to the local ctdb daemon if apporpriate.
41 */
42 static int ctdb_ltdb_store_server(struct ctdb_db_context *ctdb_db,
43 TDB_DATA key,
44 struct ctdb_ltdb_header *header,
45 TDB_DATA data)
46 {
47 struct ctdb_context *ctdb = ctdb_db->ctdb;
48 TDB_DATA rec;
49 int ret;
50 bool seqnum_suppressed = false;
51 bool keep = false;
52 bool schedule_for_deletion = false;
53 bool remove_from_delete_queue = false;
54 uint32_t lmaster;
55
56 if (ctdb->flags & CTDB_FLAG_TORTURE) {
57 struct ctdb_ltdb_header *h2;
58 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
59 h2 = (struct ctdb_ltdb_header *)rec.dptr;
60 if (rec.dptr && rec.dsize >= sizeof(h2) && h2->rsn > header->rsn) {
61 DEBUG(DEBUG_CRIT,("RSN regression! %llu %llu\n",
62 (unsigned long long)h2->rsn, (unsigned long long)header->rsn));
63 }
64 if (rec.dptr) free(rec.dptr);
65 }
66
67 if (ctdb->vnn_map == NULL) {
68 /*
69 * Called from a client: always store the record
70 * Also don't call ctdb_lmaster since it uses the vnn_map!
71 */
72 keep = true;
73 goto store;
74 }
75
76 lmaster = ctdb_lmaster(ctdb_db->ctdb, &key);
77
78 /*
79 * If we migrate an empty record off to another node
80 * and the record has not been migrated with data,
81 * delete the record instead of storing the empty record.
82 */
83 if (data.dsize != 0) {
84 keep = true;
85 } else if (header->flags & CTDB_REC_RO_FLAGS) {
86 keep = true;
87 } else if (ctdb_db->persistent) {
88 keep = true;
89 } else if (header->flags & CTDB_REC_FLAG_AUTOMATIC) {
90 /*
91 * The record is not created by the client but
92 * automatically by the ctdb_ltdb_fetch logic that
93 * creates a record with an initial header in the
94 * ltdb before trying to migrate the record from
95 * the current lmaster. Keep it instead of trying
96 * to delete the non-existing record...
97 */
98 keep = true;
99 schedule_for_deletion = true;
100 } else if (header->flags & CTDB_REC_FLAG_MIGRATED_WITH_DATA) {
101 keep = true;
102 } else if (ctdb_db->ctdb->pnn == lmaster) {
103 /*
104 * If we are lmaster, then we usually keep the record.
105 * But if we retrieve the dmaster role by a VACUUM_MIGRATE
106 * and the record is empty and has never been migrated
107 * with data, then we should delete it instead of storing it.
108 * This is part of the vacuuming process.
109 *
110 * The reason that we usually need to store even empty records
111 * on the lmaster is that a client operating directly on the
112 * lmaster (== dmaster) expects the local copy of the record to
113 * exist after successful ctdb migrate call. If the record does
114 * not exist, the client goes into a migrate loop and eventually
115 * fails. So storing the empty record makes sure that we do not
116 * need to change the client code.
117 */
118 if (!(header->flags & CTDB_REC_FLAG_VACUUM_MIGRATED)) {
119 keep = true;
120 } else if (ctdb_db->ctdb->pnn != header->dmaster) {
121 keep = true;
122 }
123 } else if (ctdb_db->ctdb->pnn == header->dmaster) {
124 keep = true;
125 }
126
127 if (keep) {
128 if (!ctdb_db->persistent &&
129 (ctdb_db->ctdb->pnn == header->dmaster) &&
130 !(header->flags & CTDB_REC_RO_FLAGS))
131 {
132 header->rsn++;
133
134 if (data.dsize == 0) {
135 schedule_for_deletion = true;
136 }
137 }
138 remove_from_delete_queue = !schedule_for_deletion;
139 }
140
141 store:
142 /*
143 * The VACUUM_MIGRATED flag is only set temporarily for
144 * the above logic when the record was retrieved by a
145 * VACUUM_MIGRATE call and should not be stored in the
146 * database.
147 *
148 * The VACUUM_MIGRATE call is triggered by a vacuum fetch,
149 * and there are two cases in which the corresponding record
150 * is stored in the local database:
151 * 1. The record has been migrated with data in the past
152 * (the MIGRATED_WITH_DATA record flag is set).
153 * 2. The record has been filled with data again since it
154 * had been submitted in the VACUUM_FETCH message to the
155 * lmaster.
156 * For such records it is important to not store the
157 * VACUUM_MIGRATED flag in the database.
158 */
159 header->flags &= ~CTDB_REC_FLAG_VACUUM_MIGRATED;
160
161 /*
162 * Similarly, clear the AUTOMATIC flag which should not enter
163 * the local database copy since this would require client
164 * modifications to clear the flag when the client stores
165 * the record.
166 */
167 header->flags &= ~CTDB_REC_FLAG_AUTOMATIC;
168
169 rec.dsize = sizeof(*header) + data.dsize;
170 rec.dptr = talloc_size(ctdb, rec.dsize);
171 CTDB_NO_MEMORY(ctdb, rec.dptr);
172
173 memcpy(rec.dptr, header, sizeof(*header));
174 memcpy(rec.dptr + sizeof(*header), data.dptr, data.dsize);
175
176 /* Databases with seqnum updates enabled only get their seqnum
177 changes when/if we modify the data */
178 if (ctdb_db->seqnum_update != NULL) {
179 TDB_DATA old;
180 old = tdb_fetch(ctdb_db->ltdb->tdb, key);
181
182 if ( (old.dsize == rec.dsize)
183 && !memcmp(old.dptr+sizeof(struct ctdb_ltdb_header),
184 rec.dptr+sizeof(struct ctdb_ltdb_header),
185 rec.dsize-sizeof(struct ctdb_ltdb_header)) ) {
186 tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
187 seqnum_suppressed = true;
188 }
189 if (old.dptr) free(old.dptr);
190 }
191
192 DEBUG(DEBUG_DEBUG, (__location__ " db[%s]: %s record: hash[0x%08x]\n",
193 ctdb_db->db_name,
194 keep?"storing":"deleting",
195 ctdb_hash(&key)));
196
197 if (keep) {
198 ret = tdb_store(ctdb_db->ltdb->tdb, key, rec, TDB_REPLACE);
199 } else {
200 ret = tdb_delete(ctdb_db->ltdb->tdb, key);
201 }
202
203 if (ret != 0) {
204 int lvl = DEBUG_ERR;
205
206 if (keep == false &&
207 tdb_error(ctdb_db->ltdb->tdb) == TDB_ERR_NOEXIST)
208 {
209 lvl = DEBUG_DEBUG;
210 }
211
212 DEBUG(lvl, (__location__ " db[%s]: Failed to %s record: "
213 "%d - %s\n",
214 ctdb_db->db_name,
215 keep?"store":"delete", ret,
216 tdb_errorstr(ctdb_db->ltdb->tdb)));
217
218 schedule_for_deletion = false;
219 remove_from_delete_queue = false;
220 }
221 if (seqnum_suppressed) {
222 tdb_add_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
223 }
224
225 talloc_free(rec.dptr);
226
227 if (schedule_for_deletion) {
228 int ret2;
229 ret2 = ctdb_local_schedule_for_deletion(ctdb_db, header, key);
230 if (ret2 != 0) {
231 DEBUG(DEBUG_ERR, (__location__ " ctdb_local_schedule_for_deletion failed.\n"));
232 }
233 }
234
235 if (remove_from_delete_queue) {
236 ctdb_local_remove_from_delete_queue(ctdb_db, header, key);
237 }
238
239 return ret;
240 }
241
242 struct lock_fetch_state {
243 struct ctdb_context *ctdb;
244 void (*recv_pkt)(void *, struct ctdb_req_header *);
245 void *recv_context;
246 struct ctdb_req_header *hdr;
247 uint32_t generation;
248 bool ignore_generation;
249 };
250
251 /*
252 called when we should retry the operation
253 */
254 static void lock_fetch_callback(void *p, bool locked)
255 {
256 struct lock_fetch_state *state = talloc_get_type(p, struct lock_fetch_state);
257 if (!state->ignore_generation &&
258 state->generation != state->ctdb->vnn_map->generation) {
259 DEBUG(DEBUG_NOTICE,("Discarding previous generation lockwait packet\n"));
260 talloc_free(state->hdr);
261 return;
262 }
263 state->recv_pkt(state->recv_context, state->hdr);
264 DEBUG(DEBUG_INFO,(__location__ " PACKET REQUEUED\n"));
265 }
266
267
268 /*
269 do a non-blocking ltdb_lock, deferring this ctdb request until we
270 have the chainlock
271
272 It does the following:
273
274 1) tries to get the chainlock. If it succeeds, then it returns 0
275
276 2) if it fails to get a chainlock immediately then it sets up a
277 non-blocking chainlock via ctdb_lock_record, and when it gets the
278 chainlock it re-submits this ctdb request to the main packet
279 receive function.
280
281 This effectively queues all ctdb requests that cannot be
282 immediately satisfied until it can get the lock. This means that
283 the main ctdb daemon will not block waiting for a chainlock held by
284 a client
285
286 There are 3 possible return values:
287
288 0: means that it got the lock immediately.
289 -1: means that it failed to get the lock, and won't retry
290 -2: means that it failed to get the lock immediately, but will retry
291 */
292 int ctdb_ltdb_lock_requeue(struct ctdb_db_context *ctdb_db,
293 TDB_DATA key, struct ctdb_req_header *hdr,
294 void (*recv_pkt)(void *, struct ctdb_req_header *),
295 void *recv_context, bool ignore_generation)
296 {
297 int ret;
298 struct tdb_context *tdb = ctdb_db->ltdb->tdb;
299 struct lock_request *lreq;
300 struct lock_fetch_state *state;
301
302 ret = tdb_chainlock_nonblock(tdb, key);
303
304 if (ret != 0 &&
305 !(errno == EACCES || errno == EAGAIN || errno == EDEADLK)) {
306 /* a hard failure - don't try again */
307 return -1;
308 }
309
310 /* when torturing, ensure we test the contended path */
311 if ((ctdb_db->ctdb->flags & CTDB_FLAG_TORTURE) &&
312 random() % 5 == 0) {
313 ret = -1;
314 tdb_chainunlock(tdb, key);
315 }
316
317 /* first the non-contended path */
318 if (ret == 0) {
319 return 0;
320 }
321
322 state = talloc(hdr, struct lock_fetch_state);
323 state->ctdb = ctdb_db->ctdb;
324 state->hdr = hdr;
325 state->recv_pkt = recv_pkt;
326 state->recv_context = recv_context;
327 state->generation = ctdb_db->ctdb->vnn_map->generation;
328 state->ignore_generation = ignore_generation;
329
330 /* now the contended path */
331 lreq = ctdb_lock_record(ctdb_db, key, true, lock_fetch_callback, state);
332 if (lreq == NULL) {
333 return -1;
334 }
335
336 /* we need to move the packet off the temporary context in ctdb_input_pkt(),
337 so it won't be freed yet */
338 talloc_steal(state, hdr);
339
340 /* now tell the caller than we will retry asynchronously */
341 return -2;
342 }
343
344 /*
345 a varient of ctdb_ltdb_lock_requeue that also fetches the record
346 */
347 int ctdb_ltdb_lock_fetch_requeue(struct ctdb_db_context *ctdb_db,
348 TDB_DATA key, struct ctdb_ltdb_header *header,
349 struct ctdb_req_header *hdr, TDB_DATA *data,
350 void (*recv_pkt)(void *, struct ctdb_req_header *),
351 void *recv_context, bool ignore_generation)
352 {
353 int ret;
354
355 ret = ctdb_ltdb_lock_requeue(ctdb_db, key, hdr, recv_pkt,
356 recv_context, ignore_generation);
357 if (ret == 0) {
358 ret = ctdb_ltdb_fetch(ctdb_db, key, header, hdr, data);
359 if (ret != 0) {
360 int uret;
361 uret = ctdb_ltdb_unlock(ctdb_db, key);
362 if (uret != 0) {
363 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", uret));
364 }
365 }
366 }
367 return ret;
368 }
369
370
371 /*
372 paraoid check to see if the db is empty
373 */
374 static void ctdb_check_db_empty(struct ctdb_db_context *ctdb_db)
375 {
376 struct tdb_context *tdb = ctdb_db->ltdb->tdb;
377 int count = tdb_traverse_read(tdb, NULL, NULL);
378 if (count != 0) {
379 DEBUG(DEBUG_ALERT,(__location__ " tdb '%s' not empty on attach! aborting\n",
380 ctdb_db->db_path));
381 ctdb_fatal(ctdb_db->ctdb, "database not empty on attach");
382 }
383 }
384
385 int ctdb_load_persistent_health(struct ctdb_context *ctdb,
386 struct ctdb_db_context *ctdb_db)
387 {
388 struct tdb_context *tdb = ctdb->db_persistent_health->tdb;
389 char *old;
390 char *reason = NULL;
391 TDB_DATA key;
392 TDB_DATA val;
393
394 key.dptr = discard_const_p(uint8_t, ctdb_db->db_name);
395 key.dsize = strlen(ctdb_db->db_name);
396
397 old = ctdb_db->unhealthy_reason;
398 ctdb_db->unhealthy_reason = NULL;
399
400 val = tdb_fetch(tdb, key);
401 if (val.dsize > 0) {
402 reason = talloc_strndup(ctdb_db,
403 (const char *)val.dptr,
404 val.dsize);
405 if (reason == NULL) {
406 DEBUG(DEBUG_ALERT,(__location__ " talloc_strndup(%d) failed\n",
407 (int)val.dsize));
408 ctdb_db->unhealthy_reason = old;
409 free(val.dptr);
410 return -1;
411 }
412 }
413
414 if (val.dptr) {
415 free(val.dptr);
416 }
417
418 talloc_free(old);
419 ctdb_db->unhealthy_reason = reason;
420 return 0;
421 }
422
423 int ctdb_update_persistent_health(struct ctdb_context *ctdb,
424 struct ctdb_db_context *ctdb_db,
425 const char *given_reason,/* NULL means healthy */
426 int num_healthy_nodes)
427 {
428 struct tdb_context *tdb = ctdb->db_persistent_health->tdb;
429 int ret;
430 TDB_DATA key;
431 TDB_DATA val;
432 char *new_reason = NULL;
433 char *old_reason = NULL;
434
435 ret = tdb_transaction_start(tdb);
436 if (ret != 0) {
437 DEBUG(DEBUG_ALERT,(__location__ " tdb_transaction_start('%s') failed: %d - %s\n",
438 tdb_name(tdb), ret, tdb_errorstr(tdb)));
439 return -1;
440 }
441
442 ret = ctdb_load_persistent_health(ctdb, ctdb_db);
443 if (ret != 0) {
444 DEBUG(DEBUG_ALERT,(__location__ " ctdb_load_persistent_health('%s') failed: %d\n",
445 ctdb_db->db_name, ret));
446 return -1;
447 }
448 old_reason = ctdb_db->unhealthy_reason;
449
450 key.dptr = discard_const_p(uint8_t, ctdb_db->db_name);
451 key.dsize = strlen(ctdb_db->db_name);
452
453 if (given_reason) {
454 new_reason = talloc_strdup(ctdb_db, given_reason);
455 if (new_reason == NULL) {
456 DEBUG(DEBUG_ALERT,(__location__ " talloc_strdup(%s) failed\n",
457 given_reason));
458 return -1;
459 }
460 } else if (old_reason && num_healthy_nodes == 0) {
461 /*
462 * If the reason indicates ok, but there where no healthy nodes
463 * available, that it means, we have not recovered valid content
464 * of the db. So if there's an old reason, prefix it with
465 * "NO-HEALTHY-NODES - "
466 */
467 const char *prefix;
468
469 #define _TMP_PREFIX "NO-HEALTHY-NODES - "
470 ret = strncmp(_TMP_PREFIX, old_reason, strlen(_TMP_PREFIX));
471 if (ret != 0) {
472 prefix = _TMP_PREFIX;
473 } else {
474 prefix = "";
475 }
476 new_reason = talloc_asprintf(ctdb_db, "%s%s",
477 prefix, old_reason);
478 if (new_reason == NULL) {
479 DEBUG(DEBUG_ALERT,(__location__ " talloc_asprintf(%s%s) failed\n",
480 prefix, old_reason));
481 return -1;
482 }
483 #undef _TMP_PREFIX
484 }
485
486 if (new_reason) {
487 val.dptr = discard_const_p(uint8_t, new_reason);
488 val.dsize = strlen(new_reason);
489
490 ret = tdb_store(tdb, key, val, TDB_REPLACE);
491 if (ret != 0) {
492 tdb_transaction_cancel(tdb);
493 DEBUG(DEBUG_ALERT,(__location__ " tdb_store('%s', %s, %s) failed: %d - %s\n",
494 tdb_name(tdb), ctdb_db->db_name, new_reason,
495 ret, tdb_errorstr(tdb)));
496 talloc_free(new_reason);
497 return -1;
498 }
499 DEBUG(DEBUG_ALERT,("Updated db health for db(%s) to: %s\n",
500 ctdb_db->db_name, new_reason));
501 } else if (old_reason) {
502 ret = tdb_delete(tdb, key);
503 if (ret != 0) {
504 tdb_transaction_cancel(tdb);
505 DEBUG(DEBUG_ALERT,(__location__ " tdb_delete('%s', %s) failed: %d - %s\n",
506 tdb_name(tdb), ctdb_db->db_name,
507 ret, tdb_errorstr(tdb)));
508 talloc_free(new_reason);
509 return -1;
510 }
511 DEBUG(DEBUG_NOTICE,("Updated db health for db(%s): OK\n",
512 ctdb_db->db_name));
513 }
514
515 ret = tdb_transaction_commit(tdb);
516 if (ret != TDB_SUCCESS) {
517 DEBUG(DEBUG_ALERT,(__location__ " tdb_transaction_commit('%s') failed: %d - %s\n",
518 tdb_name(tdb), ret, tdb_errorstr(tdb)));
519 talloc_free(new_reason);
520 return -1;
521 }
522
523 talloc_free(old_reason);
524 ctdb_db->unhealthy_reason = new_reason;
525
526 return 0;
527 }
528
529 static int ctdb_backup_corrupted_tdb(struct ctdb_context *ctdb,
530 struct ctdb_db_context *ctdb_db)
531 {
532 time_t now = time(NULL);
533 char *new_path;
534 char *new_reason;
535 int ret;
536 struct tm *tm;
537
538 tm = gmtime(&now);
539
540 /* formatted like: foo.tdb.0.corrupted.20091204160825.0Z */
541 new_path = talloc_asprintf(ctdb_db, "%s.corrupted."
542 "%04u%02u%02u%02u%02u%02u.0Z",
543 ctdb_db->db_path,
544 tm->tm_year+1900, tm->tm_mon+1,
545 tm->tm_mday, tm->tm_hour, tm->tm_min,
546 tm->tm_sec);
547 if (new_path == NULL) {
548 DEBUG(DEBUG_CRIT,(__location__ " talloc_asprintf() failed\n"));
549 return -1;
550 }
551
552 new_reason = talloc_asprintf(ctdb_db,
553 "ERROR - Backup of corrupted TDB in '%s'",
554 new_path);
555 if (new_reason == NULL) {
556 DEBUG(DEBUG_CRIT,(__location__ " talloc_asprintf() failed\n"));
557 return -1;
558 }
559 ret = ctdb_update_persistent_health(ctdb, ctdb_db, new_reason, 0);
560 talloc_free(new_reason);
561 if (ret != 0) {
562 DEBUG(DEBUG_CRIT,(__location__
563 ": ctdb_backup_corrupted_tdb(%s) not implemented yet\n",
564 ctdb_db->db_path));
565 return -1;
566 }
567
568 ret = rename(ctdb_db->db_path, new_path);
569 if (ret != 0) {
570 DEBUG(DEBUG_CRIT,(__location__
571 ": ctdb_backup_corrupted_tdb(%s) rename to %s failed: %d - %s\n",
572 ctdb_db->db_path, new_path,
573 errno, strerror(errno)));
574 talloc_free(new_path);
575 return -1;
576 }
577
578 DEBUG(DEBUG_CRIT,(__location__
579 ": ctdb_backup_corrupted_tdb(%s) renamed to %s\n",
580 ctdb_db->db_path, new_path));
581 talloc_free(new_path);
582 return 0;
583 }
584
585 int ctdb_recheck_persistent_health(struct ctdb_context *ctdb)
586 {
587 struct ctdb_db_context *ctdb_db;
588 int ret;
589 int ok = 0;
590 int fail = 0;
591
592 for (ctdb_db = ctdb->db_list; ctdb_db; ctdb_db = ctdb_db->next) {
593 if (!ctdb_db->persistent) {
594 continue;
595 }
596
597 ret = ctdb_load_persistent_health(ctdb, ctdb_db);
598 if (ret != 0) {
599 DEBUG(DEBUG_ALERT,(__location__
600 " load persistent health for '%s' failed\n",
601 ctdb_db->db_path));
602 return -1;
603 }
604
605 if (ctdb_db->unhealthy_reason == NULL) {
606 ok++;
607 DEBUG(DEBUG_INFO,(__location__
608 " persistent db '%s' healthy\n",
609 ctdb_db->db_path));
610 continue;
611 }
612
613 fail++;
614 DEBUG(DEBUG_ALERT,(__location__
615 " persistent db '%s' unhealthy: %s\n",
616 ctdb_db->db_path,
617 ctdb_db->unhealthy_reason));
618 }
619 DEBUG((fail!=0)?DEBUG_ALERT:DEBUG_NOTICE,
620 ("ctdb_recheck_presistent_health: OK[%d] FAIL[%d]\n",
621 ok, fail));
622
623 if (fail != 0) {
624 return -1;
625 }
626
627 return 0;
628 }
629
630
631 /*
632 mark a database - as healthy
633 */
634 int32_t ctdb_control_db_set_healthy(struct ctdb_context *ctdb, TDB_DATA indata)
635 {
636 uint32_t db_id = *(uint32_t *)indata.dptr;
637 struct ctdb_db_context *ctdb_db;
638 int ret;
639 bool may_recover = false;
640
641 ctdb_db = find_ctdb_db(ctdb, db_id);
642 if (!ctdb_db) {
643 DEBUG(DEBUG_ERR,(__location__ " Unknown db 0x%x\n", db_id));
644 return -1;
645 }
646
647 if (ctdb_db->unhealthy_reason) {
648 may_recover = true;
649 }
650
651 ret = ctdb_update_persistent_health(ctdb, ctdb_db, NULL, 1);
652 if (ret != 0) {
653 DEBUG(DEBUG_ERR,(__location__
654 " ctdb_update_persistent_health(%s) failed\n",
655 ctdb_db->db_name));
656 return -1;
657 }
658
659 if (may_recover && ctdb->runstate == CTDB_RUNSTATE_STARTUP) {
660 DEBUG(DEBUG_ERR, (__location__ " db %s become healthy - force recovery for startup\n",
661 ctdb_db->db_name));
662 ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
663 }
664
665 return 0;
666 }
667
668 int32_t ctdb_control_db_get_health(struct ctdb_context *ctdb,
669 TDB_DATA indata,
670 TDB_DATA *outdata)
671 {
672 uint32_t db_id = *(uint32_t *)indata.dptr;
673 struct ctdb_db_context *ctdb_db;
674 int ret;
675
676 ctdb_db = find_ctdb_db(ctdb, db_id);
677 if (!ctdb_db) {
678 DEBUG(DEBUG_ERR,(__location__ " Unknown db 0x%x\n", db_id));
679 return -1;
680 }
681
682 ret = ctdb_load_persistent_health(ctdb, ctdb_db);
683 if (ret != 0) {
684 DEBUG(DEBUG_ERR,(__location__
685 " ctdb_load_persistent_health(%s) failed\n",
686 ctdb_db->db_name));
687 return -1;
688 }
689
690 *outdata = tdb_null;
691 if (ctdb_db->unhealthy_reason) {
692 outdata->dptr = (uint8_t *)ctdb_db->unhealthy_reason;
693 outdata->dsize = strlen(ctdb_db->unhealthy_reason)+1;
694 }
695
696 return 0;
697 }
698
699
700 int ctdb_set_db_readonly(struct ctdb_context *ctdb, struct ctdb_db_context *ctdb_db)
701 {
702 char *ropath;
703
704 if (ctdb_db->readonly) {
705 return 0;
706 }
707
708 if (ctdb_db->persistent) {
709 DEBUG(DEBUG_ERR,("Persistent databases do not support readonly property\n"));
710 return -1;
711 }
712
713 ropath = talloc_asprintf(ctdb_db, "%s.RO", ctdb_db->db_path);
714 if (ropath == NULL) {
715 DEBUG(DEBUG_CRIT,("Failed to asprintf the tracking database\n"));
716 return -1;
717 }
718 ctdb_db->rottdb = tdb_open(ropath,
719 ctdb->tunable.database_hash_size,
720 TDB_NOLOCK|TDB_CLEAR_IF_FIRST|TDB_NOSYNC,
721 O_CREAT|O_RDWR, 0);
722 if (ctdb_db->rottdb == NULL) {
723 DEBUG(DEBUG_CRIT,("Failed to open/create the tracking database '%s'\n", ropath));
724 talloc_free(ropath);
725 return -1;
726 }
727
728 DEBUG(DEBUG_NOTICE,("OPENED tracking database : '%s'\n", ropath));
729
730 ctdb_db->readonly = true;
731
732 DEBUG(DEBUG_NOTICE, ("Readonly property set on DB %s\n", ctdb_db->db_name));
733
734 talloc_free(ropath);
735 return 0;
736 }
737
738 /*
739 attach to a database, handling both persistent and non-persistent databases
740 return 0 on success, -1 on failure
741 */
742 static int ctdb_local_attach(struct ctdb_context *ctdb, const char *db_name,
743 bool persistent, const char *unhealthy_reason,
744 bool jenkinshash, bool mutexes)
745 {
746 struct ctdb_db_context *ctdb_db, *tmp_db;
747 int ret;
748 struct TDB_DATA key;
749 unsigned tdb_flags;
750 int mode = 0600;
751 int remaining_tries = 0;
752
753 ctdb_db = talloc_zero(ctdb, struct ctdb_db_context);
754 CTDB_NO_MEMORY(ctdb, ctdb_db);
755
756 ctdb_db->priority = 1;
757 ctdb_db->ctdb = ctdb;
758 ctdb_db->db_name = talloc_strdup(ctdb_db, db_name);
759 CTDB_NO_MEMORY(ctdb, ctdb_db->db_name);
760
761 key.dsize = strlen(db_name)+1;
762 key.dptr = discard_const(db_name);
763 ctdb_db->db_id = ctdb_hash(&key);
764 ctdb_db->persistent = persistent;
765
766 if (!ctdb_db->persistent) {
767 ctdb_db->delete_queue = trbt_create(ctdb_db, 0);
768 if (ctdb_db->delete_queue == NULL) {
769 CTDB_NO_MEMORY(ctdb, ctdb_db->delete_queue);
770 }
771
772 ctdb_db->ctdb_ltdb_store_fn = ctdb_ltdb_store_server;
773 }
774
775 /* check for hash collisions */
776 for (tmp_db=ctdb->db_list;tmp_db;tmp_db=tmp_db->next) {
777 if (tmp_db->db_id == ctdb_db->db_id) {
778 DEBUG(DEBUG_CRIT,("db_id 0x%x hash collision. name1='%s' name2='%s'\n",
779 tmp_db->db_id, db_name, tmp_db->db_name));
780 talloc_free(ctdb_db);
781 return -1;
782 }
783 }
784
785 if (persistent) {
786 if (unhealthy_reason) {
787 ret = ctdb_update_persistent_health(ctdb, ctdb_db,
788 unhealthy_reason, 0);
789 if (ret != 0) {
790 DEBUG(DEBUG_ALERT,(__location__ " ctdb_update_persistent_health('%s','%s') failed: %d\n",
791 ctdb_db->db_name, unhealthy_reason, ret));
792 talloc_free(ctdb_db);
793 return -1;
794 }
795 }
796
797 if (ctdb->max_persistent_check_errors > 0) {
798 remaining_tries = 1;
799 }
800 if (ctdb->runstate == CTDB_RUNSTATE_RUNNING) {
801 remaining_tries = 0;
802 }
803
804 ret = ctdb_load_persistent_health(ctdb, ctdb_db);
805 if (ret != 0) {
806 DEBUG(DEBUG_ALERT,(__location__ " ctdb_load_persistent_health('%s') failed: %d\n",
807 ctdb_db->db_name, ret));
808 talloc_free(ctdb_db);
809 return -1;
810 }
811 }
812
813 if (ctdb_db->unhealthy_reason && remaining_tries == 0) {
814 DEBUG(DEBUG_ALERT,(__location__ "ERROR: tdb %s is marked as unhealthy: %s\n",
815 ctdb_db->db_name, ctdb_db->unhealthy_reason));
816 talloc_free(ctdb_db);
817 return -1;
818 }
819
820 if (ctdb_db->unhealthy_reason) {
821 /* this is just a warning, but we want that in the log file! */
822 DEBUG(DEBUG_ALERT,(__location__ "Warning: tdb %s is marked as unhealthy: %s\n",
823 ctdb_db->db_name, ctdb_db->unhealthy_reason));
824 }
825
826 /* open the database */
827 ctdb_db->db_path = talloc_asprintf(ctdb_db, "%s/%s.%u",
828 persistent?ctdb->db_directory_persistent:ctdb->db_directory,
829 db_name, ctdb->pnn);
830
831 tdb_flags = persistent? TDB_DEFAULT : TDB_CLEAR_IF_FIRST | TDB_NOSYNC;
832 if (ctdb->valgrinding) {
833 tdb_flags |= TDB_NOMMAP;
834 }
835 tdb_flags |= TDB_DISALLOW_NESTING;
836 if (jenkinshash) {
837 tdb_flags |= TDB_INCOMPATIBLE_HASH;
838 }
839 #ifdef TDB_MUTEX_LOCKING
840 if (ctdb->tunable.mutex_enabled && mutexes &&
841 tdb_runtime_check_for_robust_mutexes()) {
842 tdb_flags |= TDB_MUTEX_LOCKING;
843 }
844 #endif
845
846 again:
847 ctdb_db->ltdb = tdb_wrap_open(ctdb_db, ctdb_db->db_path,
848 ctdb->tunable.database_hash_size,
849 tdb_flags,
850 O_CREAT|O_RDWR, mode);
851 if (ctdb_db->ltdb == NULL) {
852 struct stat st;
853 int saved_errno = errno;
854
855 if (!persistent) {
856 DEBUG(DEBUG_CRIT,("Failed to open tdb '%s': %d - %s\n",
857 ctdb_db->db_path,
858 saved_errno,
859 strerror(saved_errno)));
860 talloc_free(ctdb_db);
861 return -1;
862 }
863
864 if (remaining_tries == 0) {
865 DEBUG(DEBUG_CRIT,(__location__
866 "Failed to open persistent tdb '%s': %d - %s\n",
867 ctdb_db->db_path,
868 saved_errno,
869 strerror(saved_errno)));
870 talloc_free(ctdb_db);
871 return -1;
872 }
873
874 ret = stat(ctdb_db->db_path, &st);
875 if (ret != 0) {
876 DEBUG(DEBUG_CRIT,(__location__
877 "Failed to open persistent tdb '%s': %d - %s\n",
878 ctdb_db->db_path,
879 saved_errno,
880 strerror(saved_errno)));
881 talloc_free(ctdb_db);
882 return -1;
883 }
884
885 ret = ctdb_backup_corrupted_tdb(ctdb, ctdb_db);
886 if (ret != 0) {
887 DEBUG(DEBUG_CRIT,(__location__
888 "Failed to open persistent tdb '%s': %d - %s\n",
889 ctdb_db->db_path,
890 saved_errno,
891 strerror(saved_errno)));
892 talloc_free(ctdb_db);
893 return -1;
894 }
895
896 remaining_tries--;
897 mode = st.st_mode;
898 goto again;
899 }
900
901 if (!persistent) {
902 ctdb_check_db_empty(ctdb_db);
903 } else {
904 ret = tdb_check(ctdb_db->ltdb->tdb, NULL, NULL);
905 if (ret != 0) {
906 int fd;
907 struct stat st;
908
909 DEBUG(DEBUG_CRIT,("tdb_check(%s) failed: %d - %s\n",
910 ctdb_db->db_path, ret,
911 tdb_errorstr(ctdb_db->ltdb->tdb)));
912 if (remaining_tries == 0) {
913 talloc_free(ctdb_db);
914 return -1;
915 }
916
917 fd = tdb_fd(ctdb_db->ltdb->tdb);
918 ret = fstat(fd, &st);
919 if (ret != 0) {
920 DEBUG(DEBUG_CRIT,(__location__
921 "Failed to fstat() persistent tdb '%s': %d - %s\n",
922 ctdb_db->db_path,
923 errno,
924 strerror(errno)));
925 talloc_free(ctdb_db);
926 return -1;
927 }
928
929 /* close the TDB */
930 talloc_free(ctdb_db->ltdb);
931 ctdb_db->ltdb = NULL;
932
933 ret = ctdb_backup_corrupted_tdb(ctdb, ctdb_db);
934 if (ret != 0) {
935 DEBUG(DEBUG_CRIT,("Failed to backup corrupted tdb '%s'\n",
936 ctdb_db->db_path));
937 talloc_free(ctdb_db);
938 return -1;
939 }
940
941 remaining_tries--;
942 mode = st.st_mode;
943 goto again;
944 }
945 }
946
947 /* set up a rb tree we can use to track which records we have a
948 fetch-lock in-flight for so we can defer any additional calls
949 for the same record.
950 */
951 ctdb_db->deferred_fetch = trbt_create(ctdb_db, 0);
952 if (ctdb_db->deferred_fetch == NULL) {
953 DEBUG(DEBUG_ERR,("Failed to create deferred fetch rb tree for ctdb database\n"));
954 talloc_free(ctdb_db);
955 return -1;
956 }
957
958 DLIST_ADD(ctdb->db_list, ctdb_db);
959
960 /* setting this can help some high churn databases */
961 tdb_set_max_dead(ctdb_db->ltdb->tdb, ctdb->tunable.database_max_dead);
962
963 /*
964 all databases support the "null" function. we need this in
965 order to do forced migration of records
966 */
967 ret = ctdb_daemon_set_call(ctdb, ctdb_db->db_id, ctdb_null_func, CTDB_NULL_FUNC);
968 if (ret != 0) {
969 DEBUG(DEBUG_CRIT,("Failed to setup null function for '%s'\n", ctdb_db->db_name));
970 talloc_free(ctdb_db);
971 return -1;
972 }
973
974 /*
975 all databases support the "fetch" function. we need this
976 for efficient Samba3 ctdb fetch
977 */
978 ret = ctdb_daemon_set_call(ctdb, ctdb_db->db_id, ctdb_fetch_func, CTDB_FETCH_FUNC);
979 if (ret != 0) {
980 DEBUG(DEBUG_CRIT,("Failed to setup fetch function for '%s'\n", ctdb_db->db_name));
981 talloc_free(ctdb_db);
982 return -1;
983 }
984
985 /*
986 all databases support the "fetch_with_header" function. we need this
987 for efficient readonly record fetches
988 */
989 ret = ctdb_daemon_set_call(ctdb, ctdb_db->db_id, ctdb_fetch_with_header_func, CTDB_FETCH_WITH_HEADER_FUNC);
990 if (ret != 0) {
991 DEBUG(DEBUG_CRIT,("Failed to setup fetch function for '%s'\n", ctdb_db->db_name));
992 talloc_free(ctdb_db);
993 return -1;
994 }
995
996 ret = ctdb_vacuum_init(ctdb_db);
997 if (ret != 0) {
998 DEBUG(DEBUG_CRIT,("Failed to setup vacuuming for "
999 "database '%s'\n", ctdb_db->db_name));
1000 talloc_free(ctdb_db);
1001 return -1;
1002 }
1003
1004
1005 DEBUG(DEBUG_NOTICE,("Attached to database '%s' with flags 0x%x\n",
1006 ctdb_db->db_path, tdb_flags));
1007
1008 /* success */
1009 return 0;
1010 }
1011
1012
1013 struct ctdb_deferred_attach_context {
1014 struct ctdb_deferred_attach_context *next, *prev;
1015 struct ctdb_context *ctdb;
1016 struct ctdb_req_control *c;
1017 };
1018
1019
1020 static int ctdb_deferred_attach_destructor(struct ctdb_deferred_attach_context *da_ctx)
1021 {
1022 DLIST_REMOVE(da_ctx->ctdb->deferred_attach, da_ctx);
1023
1024 return 0;
1025 }
1026
1027 static void ctdb_deferred_attach_timeout(struct event_context *ev, struct timed_event *te, struct timeval t, void *private_data)
1028 {
1029 struct ctdb_deferred_attach_context *da_ctx = talloc_get_type(private_data, struct ctdb_deferred_attach_context);
1030 struct ctdb_context *ctdb = da_ctx->ctdb;
1031
1032 ctdb_request_control_reply(ctdb, da_ctx->c, NULL, -1, NULL);
1033 talloc_free(da_ctx);
1034 }
1035
1036 static void ctdb_deferred_attach_callback(struct event_context *ev, struct timed_event *te, struct timeval t, void *private_data)
1037 {
1038 struct ctdb_deferred_attach_context *da_ctx = talloc_get_type(private_data, struct ctdb_deferred_attach_context);
1039 struct ctdb_context *ctdb = da_ctx->ctdb;
1040
1041 /* This talloc-steals the packet ->c */
1042 ctdb_input_pkt(ctdb, (struct ctdb_req_header *)da_ctx->c);
1043 talloc_free(da_ctx);
1044 }
1045
1046 int ctdb_process_deferred_attach(struct ctdb_context *ctdb)
1047 {
1048 struct ctdb_deferred_attach_context *da_ctx;
1049
1050 /* call it from the main event loop as soon as the current event
1051 finishes.
1052 */
1053 while ((da_ctx = ctdb->deferred_attach) != NULL) {
1054 DLIST_REMOVE(ctdb->deferred_attach, da_ctx);
1055 event_add_timed(ctdb->ev, da_ctx, timeval_current_ofs(1,0), ctdb_deferred_attach_callback, da_ctx);
1056 }
1057
1058 return 0;
1059 }
1060
1061 /*
1062 a client has asked to attach a new database
1063 */
1064 int32_t ctdb_control_db_attach(struct ctdb_context *ctdb, TDB_DATA indata,
1065 TDB_DATA *outdata, uint64_t tdb_flags,
1066 bool persistent, uint32_t client_id,
1067 struct ctdb_req_control *c,
1068 bool *async_reply)
1069 {
1070 const char *db_name = (const char *)indata.dptr;
1071 struct ctdb_db_context *db;
1072 struct ctdb_node *node = ctdb->nodes[ctdb->pnn];
1073 struct ctdb_client *client = NULL;
1074 bool with_jenkinshash, with_mutexes;
1075
1076 if (ctdb->tunable.allow_client_db_attach == 0) {
1077 DEBUG(DEBUG_ERR, ("DB Attach to database %s denied by tunable "
1078 "AllowClientDBAccess == 0\n", db_name));
1079 return -1;
1080 }
1081
1082 /* dont allow any local clients to attach while we are in recovery mode
1083 * except for the recovery daemon.
1084 * allow all attach from the network since these are always from remote
1085 * recovery daemons.
1086 */
1087 if (client_id != 0) {
1088 client = ctdb_reqid_find(ctdb, client_id, struct ctdb_client);
1089 }
1090 if (client != NULL) {
1091 /* If the node is inactive it is not part of the cluster
1092 and we should not allow clients to attach to any
1093 databases
1094 */
1095 if (node->flags & NODE_FLAGS_INACTIVE) {
1096 DEBUG(DEBUG_ERR,("DB Attach to database %s refused since node is inactive (flags=0x%x)\n", db_name, node->flags));
1097 return -1;
1098 }
1099
1100 if (ctdb->recovery_mode == CTDB_RECOVERY_ACTIVE &&
1101 client->pid != ctdb->recoverd_pid &&
1102 ctdb->runstate < CTDB_RUNSTATE_RUNNING) {
1103 struct ctdb_deferred_attach_context *da_ctx = talloc(client, struct ctdb_deferred_attach_context);
1104
1105 if (da_ctx == NULL) {
1106 DEBUG(DEBUG_ERR,("DB Attach to database %s deferral for client with pid:%d failed due to OOM.\n", db_name, client->pid));
1107 return -1;
1108 }
1109
1110 da_ctx->ctdb = ctdb;
1111 da_ctx->c = talloc_steal(da_ctx, c);
1112 talloc_set_destructor(da_ctx, ctdb_deferred_attach_destructor);
1113 DLIST_ADD(ctdb->deferred_attach, da_ctx);
1114
1115 event_add_timed(ctdb->ev, da_ctx, timeval_current_ofs(ctdb->tunable.deferred_attach_timeout, 0), ctdb_deferred_attach_timeout, da_ctx);
1116
1117 DEBUG(DEBUG_ERR,("DB Attach to database %s deferred for client with pid:%d since node is in recovery mode.\n", db_name, client->pid));
1118 *async_reply = true;
1119 return 0;
1120 }
1121 }
1122
1123 /* the client can optionally pass additional tdb flags, but we
1124 only allow a subset of those on the database in ctdb. Note
1125 that tdb_flags is passed in via the (otherwise unused)
1126 srvid to the attach control */
1127 #ifdef TDB_MUTEX_LOCKING
1128 tdb_flags &= (TDB_NOSYNC|TDB_INCOMPATIBLE_HASH|TDB_MUTEX_LOCKING);
1129 #else
1130 tdb_flags &= (TDB_NOSYNC|TDB_INCOMPATIBLE_HASH);
1131 #endif
1132
1133 /* see if we already have this name */
1134 db = ctdb_db_handle(ctdb, db_name);
1135 if (db) {
1136 if (db->persistent != persistent) {
1137 DEBUG(DEBUG_ERR, ("ERROR: DB Attach %spersistent to %spersistent "
1138 "database %s\n", persistent ? "" : "non-",
1139 db-> persistent ? "" : "non-", db_name));
1140 return -1;
1141 }
1142 outdata->dptr = (uint8_t *)&db->db_id;
1143 outdata->dsize = sizeof(db->db_id);
1144 tdb_add_flags(db->ltdb->tdb, tdb_flags);
1145 return 0;
1146 }
1147
1148 with_jenkinshash = (tdb_flags & TDB_INCOMPATIBLE_HASH) ? true : false;
1149 #ifdef TDB_MUTEX_LOCKING
1150 with_mutexes = (tdb_flags & TDB_MUTEX_LOCKING) ? true : false;
1151 #else
1152 with_mutexes = false;
1153 #endif
1154
1155 if (ctdb_local_attach(ctdb, db_name, persistent, NULL,
1156 with_jenkinshash, with_mutexes) != 0) {
1157 return -1;
1158 }
1159
1160 db = ctdb_db_handle(ctdb, db_name);
1161 if (!db) {
1162 DEBUG(DEBUG_ERR,("Failed to find db handle for name '%s'\n", db_name));
1163 return -1;
1164 }
1165
1166 /* remember the flags the client has specified */
1167 tdb_add_flags(db->ltdb->tdb, tdb_flags);
1168
1169 outdata->dptr = (uint8_t *)&db->db_id;
1170 outdata->dsize = sizeof(db->db_id);
1171
1172 /* Try to ensure it's locked in mem */
1173 lockdown_memory(ctdb->valgrinding);
1174
1175 /* tell all the other nodes about this database */
1176 ctdb_daemon_send_control(ctdb, CTDB_BROADCAST_ALL, tdb_flags,
1177 persistent?CTDB_CONTROL_DB_ATTACH_PERSISTENT:
1178 CTDB_CONTROL_DB_ATTACH,
1179 0, CTDB_CTRL_FLAG_NOREPLY,
1180 indata, NULL, NULL);
1181
1182 /* success */
1183 return 0;
1184 }
1185
1186 /*
1187 * a client has asked to detach from a database
1188 */
1189 int32_t ctdb_control_db_detach(struct ctdb_context *ctdb, TDB_DATA indata,
1190 uint32_t client_id)
1191 {
1192 uint32_t db_id;
1193 struct ctdb_db_context *ctdb_db;
1194 struct ctdb_client *client = NULL;
1195
1196 db_id = *(uint32_t *)indata.dptr;
1197 ctdb_db = find_ctdb_db(ctdb, db_id);
1198 if (ctdb_db == NULL) {
1199 DEBUG(DEBUG_ERR, ("Invalid dbid 0x%08x in DB detach\n",
1200 db_id));
1201 return -1;
1202 }
1203
1204 if (ctdb->tunable.allow_client_db_attach == 1) {
1205 DEBUG(DEBUG_ERR, ("DB detach from database %s denied. "
1206 "Clients are allowed access to databases "
1207 "(AllowClientDBAccess == 1)\n",
1208 ctdb_db->db_name));
1209 return -1;
1210 }
1211
1212 if (ctdb_db->persistent) {
1213 DEBUG(DEBUG_ERR, ("DB detach from persistent database %s "
1214 "denied\n", ctdb_db->db_name));
1215 return -1;
1216 }
1217
1218 /* Cannot detach from database when in recovery */
1219 if (ctdb->recovery_mode == CTDB_RECOVERY_ACTIVE) {
1220 DEBUG(DEBUG_ERR, ("DB detach denied while in recovery\n"));
1221 return -1;
1222 }
1223
1224 /* If a control comes from a client, then broadcast it to all nodes.
1225 * Do the actual detach only if the control comes from other daemons.
1226 */
1227 if (client_id != 0) {
1228 client = ctdb_reqid_find(ctdb, client_id, struct ctdb_client);
1229 if (client != NULL) {
1230 /* forward the control to all the nodes */
1231 ctdb_daemon_send_control(ctdb, CTDB_BROADCAST_ALL, 0,
1232 CTDB_CONTROL_DB_DETACH, 0,
1233 CTDB_CTRL_FLAG_NOREPLY,
1234 indata, NULL, NULL);
1235 return 0;
1236 }
1237 DEBUG(DEBUG_ERR, ("Client has gone away. Failing DB detach "
1238 "for database '%s'\n", ctdb_db->db_name));
1239 return -1;
1240 }
1241
1242 /* Detach database from recoverd */
1243 if (ctdb_daemon_send_message(ctdb, ctdb->pnn,
1244 CTDB_SRVID_DETACH_DATABASE,
1245 indata) != 0) {
1246 DEBUG(DEBUG_ERR, ("Unable to detach DB from recoverd\n"));
1247 return -1;
1248 }
1249
1250 /* Disable vacuuming and drop all vacuuming data */
1251 talloc_free(ctdb_db->vacuum_handle);
1252 talloc_free(ctdb_db->delete_queue);
1253
1254 /* Terminate any deferred fetch */
1255 talloc_free(ctdb_db->deferred_fetch);
1256
1257 /* Terminate any traverses */
1258 while (ctdb_db->traverse) {
1259 talloc_free(ctdb_db->traverse);
1260 }
1261
1262 /* Terminate any revokes */
1263 while (ctdb_db->revokechild_active) {
1264 talloc_free(ctdb_db->revokechild_active);
1265 }
1266
1267 /* Free readonly tracking database */
1268 if (ctdb_db->readonly) {
1269 talloc_free(ctdb_db->rottdb);
1270 }
1271
1272 DLIST_REMOVE(ctdb->db_list, ctdb_db);
1273
1274 DEBUG(DEBUG_NOTICE, ("Detached from database '%s'\n",
1275 ctdb_db->db_name));
1276 talloc_free(ctdb_db);
1277
1278 return 0;
1279 }
1280
1281 /*
1282 attach to all existing persistent databases
1283 */
1284 static int ctdb_attach_persistent(struct ctdb_context *ctdb,
1285 const char *unhealthy_reason)
1286 {
1287 DIR *d;
1288 struct dirent *de;
1289
1290 /* open the persistent db directory and scan it for files */
1291 d = opendir(ctdb->db_directory_persistent);
1292 if (d == NULL) {
1293 return 0;
1294 }
1295
1296 while ((de=readdir(d))) {
1297 char *p, *s, *q;
1298 size_t len = strlen(de->d_name);
1299 uint32_t node;
1300 int invalid_name = 0;
1301
1302 s = talloc_strdup(ctdb, de->d_name);
1303 if (s == NULL) {
1304 closedir(d);
1305 CTDB_NO_MEMORY(ctdb, s);
1306 }
1307
1308 /* only accept names ending in .tdb */
1309 p = strstr(s, ".tdb.");
1310 if (len < 7 || p == NULL) {
1311 talloc_free(s);
1312 continue;
1313 }
1314
1315 /* only accept names ending with .tdb. and any number of digits */
1316 q = p+5;
1317 while (*q != 0 && invalid_name == 0) {
1318 if (!isdigit(*q++)) {
1319 invalid_name = 1;
1320 }
1321 }
1322 if (invalid_name == 1 || sscanf(p+5, "%u", &node) != 1 || node != ctdb->pnn) {
1323 DEBUG(DEBUG_ERR,("Ignoring persistent database '%s'\n", de->d_name));
1324 talloc_free(s);
1325 continue;
1326 }
1327 p[4] = 0;
1328
1329 if (ctdb_local_attach(ctdb, s, true, unhealthy_reason, false, false) != 0) {
1330 DEBUG(DEBUG_ERR,("Failed to attach to persistent database '%s'\n", de->d_name));
1331 closedir(d);
1332 talloc_free(s);
1333 return -1;
1334 }
1335
1336 DEBUG(DEBUG_INFO,("Attached to persistent database %s\n", s));
1337
1338 talloc_free(s);
1339 }
1340 closedir(d);
1341 return 0;
1342 }
1343
1344 int ctdb_attach_databases(struct ctdb_context *ctdb)
1345 {
1346 int ret;
1347 char *persistent_health_path = NULL;
1348 char *unhealthy_reason = NULL;
1349 bool first_try = true;
1350
1351 persistent_health_path = talloc_asprintf(ctdb, "%s/%s.%u",
1352 ctdb->db_directory_state,
1353 PERSISTENT_HEALTH_TDB,
1354 ctdb->pnn);
1355 if (persistent_health_path == NULL) {
1356 DEBUG(DEBUG_CRIT,(__location__ " talloc_asprintf() failed\n"));
1357 return -1;
1358 }
1359
1360 again:
1361
1362 ctdb->db_persistent_health = tdb_wrap_open(ctdb, persistent_health_path,
1363 0, TDB_DISALLOW_NESTING,
1364 O_CREAT | O_RDWR, 0600);
1365 if (ctdb->db_persistent_health == NULL) {
1366 struct tdb_wrap *tdb;
1367
1368 if (!first_try) {
1369 DEBUG(DEBUG_CRIT,("Failed to open tdb '%s': %d - %s\n",
1370 persistent_health_path,
1371 errno,
1372 strerror(errno)));
1373 talloc_free(persistent_health_path);
1374 talloc_free(unhealthy_reason);
1375 return -1;
1376 }
1377 first_try = false;
1378
1379 unhealthy_reason = talloc_asprintf(ctdb, "WARNING - '%s' %s - %s",
1380 persistent_health_path,
1381 "was cleared after a failure",
1382 "manual verification needed");
1383 if (unhealthy_reason == NULL) {
1384 DEBUG(DEBUG_CRIT,(__location__ " talloc_asprintf() failed\n"));
1385 talloc_free(persistent_health_path);
1386 return -1;
1387 }
1388
1389 DEBUG(DEBUG_CRIT,("Failed to open tdb '%s' - retrying after CLEAR_IF_FIRST\n",
1390 persistent_health_path));
1391 tdb = tdb_wrap_open(ctdb, persistent_health_path,
1392 0, TDB_CLEAR_IF_FIRST | TDB_DISALLOW_NESTING,
1393 O_CREAT | O_RDWR, 0600);
1394 if (tdb) {
1395 DEBUG(DEBUG_CRIT,("Failed to open tdb '%s' - with CLEAR_IF_FIRST: %d - %s\n",
1396 persistent_health_path,
1397 errno,
1398 strerror(errno)));
1399 talloc_free(persistent_health_path);
1400 talloc_free(unhealthy_reason);
1401 return -1;
1402 }
1403
1404 talloc_free(tdb);
1405 goto again;
1406 }
1407 ret = tdb_check(ctdb->db_persistent_health->tdb, NULL, NULL);
1408 if (ret != 0) {
1409 struct tdb_wrap *tdb;
1410
1411 talloc_free(ctdb->db_persistent_health);
1412 ctdb->db_persistent_health = NULL;
1413
1414 if (!first_try) {
1415 DEBUG(DEBUG_CRIT,("tdb_check('%s') failed\n",
1416 persistent_health_path));
1417 talloc_free(persistent_health_path);
1418 talloc_free(unhealthy_reason);
1419 return -1;
1420 }
1421 first_try = false;
1422
1423 unhealthy_reason = talloc_asprintf(ctdb, "WARNING - '%s' %s - %s",
1424 persistent_health_path,
1425 "was cleared after a failure",
1426 "manual verification needed");
1427 if (unhealthy_reason == NULL) {
1428 DEBUG(DEBUG_CRIT,(__location__ " talloc_asprintf() failed\n"));
1429 talloc_free(persistent_health_path);
1430 return -1;
1431 }
1432
1433 DEBUG(DEBUG_CRIT,("tdb_check('%s') failed - retrying after CLEAR_IF_FIRST\n",
1434 persistent_health_path));
1435 tdb = tdb_wrap_open(ctdb, persistent_health_path,
1436 0, TDB_CLEAR_IF_FIRST | TDB_DISALLOW_NESTING,
1437 O_CREAT | O_RDWR, 0600);
1438 if (tdb) {
1439 DEBUG(DEBUG_CRIT,("Failed to open tdb '%s' - with CLEAR_IF_FIRST: %d - %s\n",
1440 persistent_health_path,
1441 errno,
1442 strerror(errno)));
1443 talloc_free(persistent_health_path);
1444 talloc_free(unhealthy_reason);
1445 return -1;
1446 }
1447
1448 talloc_free(tdb);
1449 goto again;
1450 }
1451 talloc_free(persistent_health_path);
1452
1453 ret = ctdb_attach_persistent(ctdb, unhealthy_reason);
1454 talloc_free(unhealthy_reason);
1455 if (ret != 0) {
1456 return ret;
1457 }
1458
1459 return 0;
1460 }
1461
1462 /*
1463 called when a broadcast seqnum update comes in
1464 */
1465 int32_t ctdb_ltdb_update_seqnum(struct ctdb_context *ctdb, uint32_t db_id, uint32_t srcnode)
1466 {
1467 struct ctdb_db_context *ctdb_db;
1468 if (srcnode == ctdb->pnn) {
1469 /* don't update ourselves! */
1470 return 0;
1471 }
1472
1473 ctdb_db = find_ctdb_db(ctdb, db_id);
1474 if (!ctdb_db) {
1475 DEBUG(DEBUG_ERR,("Unknown db_id 0x%x in ctdb_ltdb_update_seqnum\n", db_id));
1476 return -1;
1477 }
1478
1479 if (ctdb_db->unhealthy_reason) {
1480 DEBUG(DEBUG_ERR,("db(%s) unhealty in ctdb_ltdb_update_seqnum: %s\n",
1481 ctdb_db->db_name, ctdb_db->unhealthy_reason));
1482 return -1;
1483 }
1484
1485 tdb_increment_seqnum_nonblock(ctdb_db->ltdb->tdb);
1486 ctdb_db->seqnum = tdb_get_seqnum(ctdb_db->ltdb->tdb);
1487 return 0;
1488 }
1489
1490 /*
1491 timer to check for seqnum changes in a ltdb and propogate them
1492 */
1493 static void ctdb_ltdb_seqnum_check(struct event_context *ev, struct timed_event *te,
1494 struct timeval t, void *p)
1495 {
1496 struct ctdb_db_context *ctdb_db = talloc_get_type(p, struct ctdb_db_context);
1497 struct ctdb_context *ctdb = ctdb_db->ctdb;
1498 uint32_t new_seqnum = tdb_get_seqnum(ctdb_db->ltdb->tdb);
1499 if (new_seqnum != ctdb_db->seqnum) {
1500 /* something has changed - propogate it */
1501 TDB_DATA data;
1502 data.dptr = (uint8_t *)&ctdb_db->db_id;
1503 data.dsize = sizeof(uint32_t);
1504 ctdb_daemon_send_control(ctdb, CTDB_BROADCAST_VNNMAP, 0,
1505 CTDB_CONTROL_UPDATE_SEQNUM, 0, CTDB_CTRL_FLAG_NOREPLY,
1506 data, NULL, NULL);
1507 }
1508 ctdb_db->seqnum = new_seqnum;
1509
1510 /* setup a new timer */
1511 ctdb_db->seqnum_update =
1512 event_add_timed(ctdb->ev, ctdb_db,
1513 timeval_current_ofs(ctdb->tunable.seqnum_interval/1000, (ctdb->tunable.seqnum_interval%1000)*1000),
1514 ctdb_ltdb_seqnum_check, ctdb_db);
1515 }
1516
1517 /*
1518 enable seqnum handling on this db
1519 */
1520 int32_t ctdb_ltdb_enable_seqnum(struct ctdb_context *ctdb, uint32_t db_id)
1521 {
1522 struct ctdb_db_context *ctdb_db;
1523 ctdb_db = find_ctdb_db(ctdb, db_id);
1524 if (!ctdb_db) {
1525 DEBUG(DEBUG_ERR,("Unknown db_id 0x%x in ctdb_ltdb_enable_seqnum\n", db_id));
1526 return -1;
1527 }
1528
1529 if (ctdb_db->seqnum_update == NULL) {
1530 ctdb_db->seqnum_update =
1531 event_add_timed(ctdb->ev, ctdb_db,
1532 timeval_current_ofs(ctdb->tunable.seqnum_interval/1000, (ctdb->tunable.seqnum_interval%1000)*1000),
1533 ctdb_ltdb_seqnum_check, ctdb_db);
1534 }
1535
1536 tdb_enable_seqnum(ctdb_db->ltdb->tdb);
1537 ctdb_db->seqnum = tdb_get_seqnum(ctdb_db->ltdb->tdb);
1538 return 0;
1539 }
1540
1541 int32_t ctdb_control_set_db_priority(struct ctdb_context *ctdb, TDB_DATA indata,
1542 uint32_t client_id)
1543 {
1544 struct ctdb_db_priority *db_prio = (struct ctdb_db_priority *)indata.dptr;
1545 struct ctdb_db_context *ctdb_db;
1546
1547 ctdb_db = find_ctdb_db(ctdb, db_prio->db_id);
1548 if (!ctdb_db) {
1549 if (!(ctdb->nodes[ctdb->pnn]->flags & NODE_FLAGS_INACTIVE)) {
1550 DEBUG(DEBUG_ERR,("Unknown db_id 0x%x in ctdb_set_db_priority\n",
1551 db_prio->db_id));
1552 }
1553 return 0;
1554 }
1555
1556 if ((db_prio->priority<1) || (db_prio->priority>NUM_DB_PRIORITIES)) {
1557 DEBUG(DEBUG_ERR,("Trying to set invalid priority : %u\n", db_prio->priority));
1558 return 0;
1559 }
1560
1561 ctdb_db->priority = db_prio->priority;
1562 DEBUG(DEBUG_INFO,("Setting DB priority to %u for db 0x%08x\n", db_prio->priority, db_prio->db_id));
1563
1564 if (client_id != 0) {
1565 /* Broadcast the update to the rest of the cluster */
1566 ctdb_daemon_send_control(ctdb, CTDB_BROADCAST_ALL, 0,
1567 CTDB_CONTROL_SET_DB_PRIORITY, 0,
1568 CTDB_CTRL_FLAG_NOREPLY, indata,
1569 NULL, NULL);
1570 }
1571 return 0;
1572 }
1573
1574
1575 int ctdb_set_db_sticky(struct ctdb_context *ctdb, struct ctdb_db_context *ctdb_db)
1576 {
1577 if (ctdb_db->sticky) {
1578 return 0;
1579 }
1580
1581 if (ctdb_db->persistent) {
1582 DEBUG(DEBUG_ERR,("Trying to set persistent database with sticky property\n"));
1583 return -1;
1584 }
1585
1586 ctdb_db->sticky_records = trbt_create(ctdb_db, 0);
1587
1588 ctdb_db->sticky = true;
1589
1590 DEBUG(DEBUG_NOTICE,("set db sticky %s\n", ctdb_db->db_name));
1591
1592 return 0;
1593 }
1594
1595 int32_t ctdb_control_get_db_statistics(struct ctdb_context *ctdb,
1596 uint32_t db_id,
1597 TDB_DATA *outdata)
1598 {
1599 struct ctdb_db_context *ctdb_db;
1600 struct ctdb_db_statistics *stats;
1601 int i;
1602 int len;
1603 char *ptr;
1604
1605 ctdb_db = find_ctdb_db(ctdb, db_id);
1606 if (!ctdb_db) {
1607 DEBUG(DEBUG_ERR,("Unknown db_id 0x%x in get_db_statistics\n", db_id));
1608 return -1;
1609 }
1610
1611 len = offsetof(struct ctdb_db_statistics, hot_keys_wire);
1612 for (i = 0; i < MAX_HOT_KEYS; i++) {
1613 len += ctdb_db->statistics.hot_keys[i].key.dsize;
1614 }
1615
1616 stats = talloc_size(outdata, len);
1617 if (stats == NULL) {
1618 DEBUG(DEBUG_ERR,("Failed to allocate db statistics structure\n"));
1619 return -1;
1620 }
1621
1622 *stats = ctdb_db->statistics;
1623
1624 stats->num_hot_keys = MAX_HOT_KEYS;
1625
1626 ptr = &stats->hot_keys_wire[0];
1627 for (i = 0; i < MAX_HOT_KEYS; i++) {
1628 memcpy(ptr, ctdb_db->statistics.hot_keys[i].key.dptr,
1629 ctdb_db->statistics.hot_keys[i].key.dsize);
1630 ptr += ctdb_db->statistics.hot_keys[i].key.dsize;
1631 }
1632
1633 outdata->dptr = (uint8_t *)stats;
1634 outdata->dsize = len;
1635
1636 return 0;
1637 }
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