2 ctdb_call protocol code
4 Copyright (C) Andrew Tridgell 2006
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.
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.
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/>.
20 see http://wiki.samba.org/index.php/Samba_%26_Clustering for
21 protocol design and packet details
24 #include "lib/tevent/tevent.h"
25 #include "lib/tdb/include/tdb.h"
26 #include "lib/util/dlinklist.h"
27 #include "system/network.h"
28 #include "system/filesys.h"
29 #include "../include/ctdb_private.h"
32 find the ctdb_db from a db index
34 struct ctdb_db_context *find_ctdb_db(struct ctdb_context *ctdb, uint32_t id)
36 struct ctdb_db_context *ctdb_db;
38 for (ctdb_db=ctdb->db_list; ctdb_db; ctdb_db=ctdb_db->next) {
39 if (ctdb_db->db_id == id) {
48 a varient of input packet that can be used in lock requeue
50 static void ctdb_call_input_pkt(void *p, struct ctdb_req_header *hdr)
52 struct ctdb_context *ctdb = talloc_get_type(p, struct ctdb_context);
53 ctdb_input_pkt(ctdb, hdr);
60 static void ctdb_send_error(struct ctdb_context *ctdb,
61 struct ctdb_req_header *hdr, uint32_t status,
62 const char *fmt, ...) PRINTF_ATTRIBUTE(4,5);
63 static void ctdb_send_error(struct ctdb_context *ctdb,
64 struct ctdb_req_header *hdr, uint32_t status,
68 struct ctdb_reply_error *r;
72 if (ctdb->methods == NULL) {
73 DEBUG(DEBUG_INFO,(__location__ " Failed to send error. Transport is DOWN\n"));
78 msg = talloc_vasprintf(ctdb, fmt, ap);
80 ctdb_fatal(ctdb, "Unable to allocate error in ctdb_send_error\n");
84 msglen = strlen(msg)+1;
85 len = offsetof(struct ctdb_reply_error, msg);
86 r = ctdb_transport_allocate(ctdb, msg, CTDB_REPLY_ERROR, len + msglen,
87 struct ctdb_reply_error);
88 CTDB_NO_MEMORY_FATAL(ctdb, r);
90 r->hdr.destnode = hdr->srcnode;
91 r->hdr.reqid = hdr->reqid;
94 memcpy(&r->msg[0], msg, msglen);
96 ctdb_queue_packet(ctdb, &r->hdr);
103 send a redirect reply
105 static void ctdb_call_send_redirect(struct ctdb_context *ctdb,
107 struct ctdb_req_call *c,
108 struct ctdb_ltdb_header *header)
111 uint32_t lmaster = ctdb_lmaster(ctdb, &key);
112 if (ctdb->pnn == lmaster) {
113 c->hdr.destnode = header->dmaster;
114 } else if ((c->hopcount % ctdb->tunable.max_redirect_count) == 0) {
115 c->hdr.destnode = lmaster;
117 c->hdr.destnode = header->dmaster;
120 ctdb_queue_packet(ctdb, &c->hdr);
127 caller must have the chainlock before calling this routine. Caller must be
130 static void ctdb_send_dmaster_reply(struct ctdb_db_context *ctdb_db,
131 struct ctdb_ltdb_header *header,
132 TDB_DATA key, TDB_DATA data,
133 uint32_t new_dmaster,
136 struct ctdb_context *ctdb = ctdb_db->ctdb;
137 struct ctdb_reply_dmaster *r;
141 if (ctdb->pnn != ctdb_lmaster(ctdb, &key)) {
142 DEBUG(DEBUG_ALERT,(__location__ " Caller is not lmaster!\n"));
146 header->dmaster = new_dmaster;
147 ret = ctdb_ltdb_store(ctdb_db, key, header, data);
149 ctdb_fatal(ctdb, "ctdb_send_dmaster_reply unable to update dmaster");
153 if (ctdb->methods == NULL) {
154 ctdb_fatal(ctdb, "ctdb_send_dmaster_reply cant update dmaster since transport is down");
158 /* put the packet on a temporary context, allowing us to safely free
159 it below even if ctdb_reply_dmaster() has freed it already */
160 tmp_ctx = talloc_new(ctdb);
162 /* send the CTDB_REPLY_DMASTER */
163 len = offsetof(struct ctdb_reply_dmaster, data) + key.dsize + data.dsize;
164 r = ctdb_transport_allocate(ctdb, tmp_ctx, CTDB_REPLY_DMASTER, len,
165 struct ctdb_reply_dmaster);
166 CTDB_NO_MEMORY_FATAL(ctdb, r);
168 r->hdr.destnode = new_dmaster;
169 r->hdr.reqid = reqid;
170 r->rsn = header->rsn;
171 r->keylen = key.dsize;
172 r->datalen = data.dsize;
173 r->db_id = ctdb_db->db_id;
174 memcpy(&r->data[0], key.dptr, key.dsize);
175 memcpy(&r->data[key.dsize], data.dptr, data.dsize);
177 ctdb_queue_packet(ctdb, &r->hdr);
179 talloc_free(tmp_ctx);
183 send a dmaster request (give another node the dmaster for a record)
185 This is always sent to the lmaster, which ensures that the lmaster
186 always knows who the dmaster is. The lmaster will then send a
187 CTDB_REPLY_DMASTER to the new dmaster
189 static void ctdb_call_send_dmaster(struct ctdb_db_context *ctdb_db,
190 struct ctdb_req_call *c,
191 struct ctdb_ltdb_header *header,
192 TDB_DATA *key, TDB_DATA *data)
194 struct ctdb_req_dmaster *r;
195 struct ctdb_context *ctdb = ctdb_db->ctdb;
197 uint32_t lmaster = ctdb_lmaster(ctdb, key);
199 if (ctdb->methods == NULL) {
200 ctdb_fatal(ctdb, "Failed ctdb_call_send_dmaster since transport is down");
204 if (lmaster == ctdb->pnn) {
205 ctdb_send_dmaster_reply(ctdb_db, header, *key, *data,
206 c->hdr.srcnode, c->hdr.reqid);
210 len = offsetof(struct ctdb_req_dmaster, data) + key->dsize + data->dsize;
211 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_DMASTER, len,
212 struct ctdb_req_dmaster);
213 CTDB_NO_MEMORY_FATAL(ctdb, r);
214 r->hdr.destnode = lmaster;
215 r->hdr.reqid = c->hdr.reqid;
217 r->rsn = header->rsn;
218 r->dmaster = c->hdr.srcnode;
219 r->keylen = key->dsize;
220 r->datalen = data->dsize;
221 memcpy(&r->data[0], key->dptr, key->dsize);
222 memcpy(&r->data[key->dsize], data->dptr, data->dsize);
224 header->dmaster = c->hdr.srcnode;
225 if (ctdb_ltdb_store(ctdb_db, *key, header, *data) != 0) {
226 ctdb_fatal(ctdb, "Failed to store record in ctdb_call_send_dmaster");
229 ctdb_queue_packet(ctdb, &r->hdr);
235 called when a CTDB_REPLY_DMASTER packet comes in, or when the lmaster
236 gets a CTDB_REQUEST_DMASTER for itself. We become the dmaster.
238 must be called with the chainlock held. This function releases the chainlock
240 static void ctdb_become_dmaster(struct ctdb_db_context *ctdb_db,
241 struct ctdb_req_header *hdr,
242 TDB_DATA key, TDB_DATA data,
245 struct ctdb_call_state *state;
246 struct ctdb_context *ctdb = ctdb_db->ctdb;
247 struct ctdb_ltdb_header header;
250 DEBUG(DEBUG_DEBUG,("pnn %u dmaster response %08x\n", ctdb->pnn, ctdb_hash(&key)));
253 header.rsn = rsn + 1;
254 header.dmaster = ctdb->pnn;
256 if (ctdb_ltdb_store(ctdb_db, key, &header, data) != 0) {
257 ctdb_fatal(ctdb, "ctdb_reply_dmaster store failed\n");
259 ret = ctdb_ltdb_unlock(ctdb_db, key);
261 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
266 state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_call_state);
269 DEBUG(DEBUG_ERR,("pnn %u Invalid reqid %u in ctdb_become_dmaster from node %u\n",
270 ctdb->pnn, hdr->reqid, hdr->srcnode));
272 ret = ctdb_ltdb_unlock(ctdb_db, key);
274 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
279 if (key.dsize != state->call->key.dsize || memcmp(key.dptr, state->call->key.dptr, key.dsize)) {
280 DEBUG(DEBUG_ERR, ("Got bogus DMASTER packet reqid:%u from node %u. Key does not match key held in matching idr.\n", hdr->reqid, hdr->srcnode));
282 ret = ctdb_ltdb_unlock(ctdb_db, key);
284 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
289 if (hdr->reqid != state->reqid) {
290 /* we found a record but it was the wrong one */
291 DEBUG(DEBUG_ERR, ("Dropped orphan in ctdb_become_dmaster with reqid:%u\n from node %u", hdr->reqid, hdr->srcnode));
293 ret = ctdb_ltdb_unlock(ctdb_db, key);
295 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
300 ctdb_call_local(ctdb_db, state->call, &header, state, &data);
302 ret = ctdb_ltdb_unlock(ctdb_db, state->call->key);
304 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
307 state->state = CTDB_CALL_DONE;
308 if (state->async.fn) {
309 state->async.fn(state);
316 called when a CTDB_REQ_DMASTER packet comes in
318 this comes into the lmaster for a record when the current dmaster
319 wants to give up the dmaster role and give it to someone else
321 void ctdb_request_dmaster(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
323 struct ctdb_req_dmaster *c = (struct ctdb_req_dmaster *)hdr;
324 TDB_DATA key, data, data2;
325 struct ctdb_ltdb_header header;
326 struct ctdb_db_context *ctdb_db;
330 key.dsize = c->keylen;
331 data.dptr = c->data + c->keylen;
332 data.dsize = c->datalen;
334 ctdb_db = find_ctdb_db(ctdb, c->db_id);
336 ctdb_send_error(ctdb, hdr, -1,
337 "Unknown database in request. db_id==0x%08x",
342 /* fetch the current record */
343 ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, key, &header, hdr, &data2,
344 ctdb_call_input_pkt, ctdb, False);
346 ctdb_fatal(ctdb, "ctdb_req_dmaster failed to fetch record");
350 DEBUG(DEBUG_INFO,(__location__ " deferring ctdb_request_dmaster\n"));
354 if (ctdb_lmaster(ctdb, &key) != ctdb->pnn) {
355 DEBUG(DEBUG_ALERT,("pnn %u dmaster request to non-lmaster lmaster=%u gen=%u curgen=%u\n",
356 ctdb->pnn, ctdb_lmaster(ctdb, &key),
357 hdr->generation, ctdb->vnn_map->generation));
358 ctdb_fatal(ctdb, "ctdb_req_dmaster to non-lmaster");
361 DEBUG(DEBUG_DEBUG,("pnn %u dmaster request on %08x for %u from %u\n",
362 ctdb->pnn, ctdb_hash(&key), c->dmaster, c->hdr.srcnode));
364 /* its a protocol error if the sending node is not the current dmaster */
365 if (header.dmaster != hdr->srcnode) {
366 DEBUG(DEBUG_ALERT,("pnn %u dmaster request for new-dmaster %u from non-master %u real-dmaster=%u key %08x dbid 0x%08x gen=%u curgen=%u c->rsn=%llu header.rsn=%llu reqid=%u keyval=0x%08x\n",
367 ctdb->pnn, c->dmaster, hdr->srcnode, header.dmaster, ctdb_hash(&key),
368 ctdb_db->db_id, hdr->generation, ctdb->vnn_map->generation,
369 (unsigned long long)c->rsn, (unsigned long long)header.rsn, c->hdr.reqid,
370 (key.dsize >= 4)?(*(uint32_t *)key.dptr):0));
371 if (header.rsn != 0 || header.dmaster != ctdb->pnn) {
372 DEBUG(DEBUG_ERR,("ctdb_req_dmaster from non-master. Force a recovery.\n"));
374 ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
379 if (header.rsn > c->rsn) {
380 DEBUG(DEBUG_ALERT,("pnn %u dmaster request with older RSN new-dmaster %u from %u real-dmaster=%u key %08x dbid 0x%08x gen=%u curgen=%u c->rsn=%llu header.rsn=%llu reqid=%u\n",
381 ctdb->pnn, c->dmaster, hdr->srcnode, header.dmaster, ctdb_hash(&key),
382 ctdb_db->db_id, hdr->generation, ctdb->vnn_map->generation,
383 (unsigned long long)c->rsn, (unsigned long long)header.rsn, c->hdr.reqid));
386 /* use the rsn from the sending node */
389 /* check if the new dmaster is the lmaster, in which case we
390 skip the dmaster reply */
391 if (c->dmaster == ctdb->pnn) {
392 ctdb_become_dmaster(ctdb_db, hdr, key, data, c->rsn);
394 ctdb_send_dmaster_reply(ctdb_db, &header, key, data, c->dmaster, hdr->reqid);
396 ret = ctdb_ltdb_unlock(ctdb_db, key);
398 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
405 called when a CTDB_REQ_CALL packet comes in
407 void ctdb_request_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
409 struct ctdb_req_call *c = (struct ctdb_req_call *)hdr;
411 struct ctdb_reply_call *r;
413 struct ctdb_ltdb_header header;
414 struct ctdb_call *call;
415 struct ctdb_db_context *ctdb_db;
417 if (ctdb->methods == NULL) {
418 DEBUG(DEBUG_INFO,(__location__ " Failed ctdb_request_call. Transport is DOWN\n"));
423 ctdb_db = find_ctdb_db(ctdb, c->db_id);
425 ctdb_send_error(ctdb, hdr, -1,
426 "Unknown database in request. db_id==0x%08x",
431 call = talloc(hdr, struct ctdb_call);
432 CTDB_NO_MEMORY_FATAL(ctdb, call);
434 call->call_id = c->callid;
435 call->key.dptr = c->data;
436 call->key.dsize = c->keylen;
437 call->call_data.dptr = c->data + c->keylen;
438 call->call_data.dsize = c->calldatalen;
440 /* determine if we are the dmaster for this key. This also
441 fetches the record data (if any), thus avoiding a 2nd fetch of the data
442 if the call will be answered locally */
444 ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, call->key, &header, hdr, &data,
445 ctdb_call_input_pkt, ctdb, False);
447 ctdb_send_error(ctdb, hdr, ret, "ltdb fetch failed in ctdb_request_call");
451 DEBUG(DEBUG_INFO,(__location__ " deferred ctdb_request_call\n"));
455 /* if we are not the dmaster, then send a redirect to the
457 if (header.dmaster != ctdb->pnn) {
458 talloc_free(data.dptr);
459 ctdb_call_send_redirect(ctdb, call->key, c, &header);
461 ret = ctdb_ltdb_unlock(ctdb_db, call->key);
463 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
468 CTDB_UPDATE_STAT(ctdb, max_hop_count, c->hopcount);
470 /* Try if possible to migrate the record off to the caller node.
471 * From the clients perspective a fetch of the data is just as
472 * expensive as a migration.
474 if (c->hdr.srcnode != ctdb->pnn) {
475 if (ctdb_db->transaction_active) {
476 DEBUG(DEBUG_INFO, (__location__ " refusing migration"
477 " of key %s while transaction is active\n",
478 (char *)call->key.dptr));
480 DEBUG(DEBUG_DEBUG,("pnn %u starting migration of %08x to %u\n",
481 ctdb->pnn, ctdb_hash(&(call->key)), c->hdr.srcnode));
482 ctdb_call_send_dmaster(ctdb_db, c, &header, &(call->key), &data);
483 talloc_free(data.dptr);
485 ret = ctdb_ltdb_unlock(ctdb_db, call->key);
487 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
493 ctdb_call_local(ctdb_db, call, &header, hdr, &data);
495 ret = ctdb_ltdb_unlock(ctdb_db, call->key);
497 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
500 len = offsetof(struct ctdb_reply_call, data) + call->reply_data.dsize;
501 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REPLY_CALL, len,
502 struct ctdb_reply_call);
503 CTDB_NO_MEMORY_FATAL(ctdb, r);
504 r->hdr.destnode = hdr->srcnode;
505 r->hdr.reqid = hdr->reqid;
506 r->status = call->status;
507 r->datalen = call->reply_data.dsize;
508 if (call->reply_data.dsize) {
509 memcpy(&r->data[0], call->reply_data.dptr, call->reply_data.dsize);
512 ctdb_queue_packet(ctdb, &r->hdr);
518 called when a CTDB_REPLY_CALL packet comes in
520 This packet comes in response to a CTDB_REQ_CALL request packet. It
521 contains any reply data from the call
523 void ctdb_reply_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
525 struct ctdb_reply_call *c = (struct ctdb_reply_call *)hdr;
526 struct ctdb_call_state *state;
528 state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_call_state);
530 DEBUG(DEBUG_ERR, (__location__ " reqid %u not found\n", hdr->reqid));
534 if (hdr->reqid != state->reqid) {
535 /* we found a record but it was the wrong one */
536 DEBUG(DEBUG_ERR, ("Dropped orphaned call reply with reqid:%u\n",hdr->reqid));
540 state->call->reply_data.dptr = c->data;
541 state->call->reply_data.dsize = c->datalen;
542 state->call->status = c->status;
544 talloc_steal(state, c);
546 state->state = CTDB_CALL_DONE;
547 if (state->async.fn) {
548 state->async.fn(state);
554 called when a CTDB_REPLY_DMASTER packet comes in
556 This packet comes in from the lmaster response to a CTDB_REQ_CALL
557 request packet. It means that the current dmaster wants to give us
560 void ctdb_reply_dmaster(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
562 struct ctdb_reply_dmaster *c = (struct ctdb_reply_dmaster *)hdr;
563 struct ctdb_db_context *ctdb_db;
567 ctdb_db = find_ctdb_db(ctdb, c->db_id);
568 if (ctdb_db == NULL) {
569 DEBUG(DEBUG_ERR,("Unknown db_id 0x%x in ctdb_reply_dmaster\n", c->db_id));
574 key.dsize = c->keylen;
575 data.dptr = &c->data[key.dsize];
576 data.dsize = c->datalen;
578 ret = ctdb_ltdb_lock_requeue(ctdb_db, key, hdr,
579 ctdb_call_input_pkt, ctdb, False);
584 DEBUG(DEBUG_ERR,(__location__ " Failed to get lock in ctdb_reply_dmaster\n"));
588 ctdb_become_dmaster(ctdb_db, hdr, key, data, c->rsn);
593 called when a CTDB_REPLY_ERROR packet comes in
595 void ctdb_reply_error(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
597 struct ctdb_reply_error *c = (struct ctdb_reply_error *)hdr;
598 struct ctdb_call_state *state;
600 state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_call_state);
602 DEBUG(DEBUG_ERR,("pnn %u Invalid reqid %u in ctdb_reply_error\n",
603 ctdb->pnn, hdr->reqid));
607 if (hdr->reqid != state->reqid) {
608 /* we found a record but it was the wrong one */
609 DEBUG(DEBUG_ERR, ("Dropped orphaned error reply with reqid:%u\n",hdr->reqid));
613 talloc_steal(state, c);
615 state->state = CTDB_CALL_ERROR;
616 state->errmsg = (char *)c->msg;
617 if (state->async.fn) {
618 state->async.fn(state);
626 static int ctdb_call_destructor(struct ctdb_call_state *state)
628 DLIST_REMOVE(state->ctdb_db->ctdb->pending_calls, state);
629 ctdb_reqid_remove(state->ctdb_db->ctdb, state->reqid);
635 called when a ctdb_call needs to be resent after a reconfigure event
637 static void ctdb_call_resend(struct ctdb_call_state *state)
639 struct ctdb_context *ctdb = state->ctdb_db->ctdb;
641 state->generation = ctdb->vnn_map->generation;
643 /* use a new reqid, in case the old reply does eventually come in */
644 ctdb_reqid_remove(ctdb, state->reqid);
645 state->reqid = ctdb_reqid_new(ctdb, state);
646 state->c->hdr.reqid = state->reqid;
648 /* update the generation count for this request, so its valid with the new vnn_map */
649 state->c->hdr.generation = state->generation;
651 /* send the packet to ourselves, it will be redirected appropriately */
652 state->c->hdr.destnode = ctdb->pnn;
654 ctdb_queue_packet(ctdb, &state->c->hdr);
655 DEBUG(DEBUG_NOTICE,("resent ctdb_call\n"));
659 resend all pending calls on recovery
661 void ctdb_call_resend_all(struct ctdb_context *ctdb)
663 struct ctdb_call_state *state, *next;
664 for (state=ctdb->pending_calls;state;state=next) {
666 ctdb_call_resend(state);
671 this allows the caller to setup a async.fn
673 static void call_local_trigger(struct event_context *ev, struct timed_event *te,
674 struct timeval t, void *private_data)
676 struct ctdb_call_state *state = talloc_get_type(private_data, struct ctdb_call_state);
677 if (state->async.fn) {
678 state->async.fn(state);
684 construct an event driven local ctdb_call
686 this is used so that locally processed ctdb_call requests are processed
687 in an event driven manner
689 struct ctdb_call_state *ctdb_call_local_send(struct ctdb_db_context *ctdb_db,
690 struct ctdb_call *call,
691 struct ctdb_ltdb_header *header,
694 struct ctdb_call_state *state;
695 struct ctdb_context *ctdb = ctdb_db->ctdb;
698 state = talloc_zero(ctdb_db, struct ctdb_call_state);
699 CTDB_NO_MEMORY_NULL(ctdb, state);
701 talloc_steal(state, data->dptr);
703 state->state = CTDB_CALL_DONE;
704 state->call = talloc(state, struct ctdb_call);
705 CTDB_NO_MEMORY_NULL(ctdb, state->call);
706 *(state->call) = *call;
707 state->ctdb_db = ctdb_db;
709 ret = ctdb_call_local(ctdb_db, state->call, header, state, data);
711 event_add_timed(ctdb->ev, state, timeval_zero(), call_local_trigger, state);
718 make a remote ctdb call - async send. Called in daemon context.
720 This constructs a ctdb_call request and queues it for processing.
721 This call never blocks.
723 struct ctdb_call_state *ctdb_daemon_call_send_remote(struct ctdb_db_context *ctdb_db,
724 struct ctdb_call *call,
725 struct ctdb_ltdb_header *header)
728 struct ctdb_call_state *state;
729 struct ctdb_context *ctdb = ctdb_db->ctdb;
731 if (ctdb->methods == NULL) {
732 DEBUG(DEBUG_INFO,(__location__ " Failed send packet. Transport is down\n"));
736 state = talloc_zero(ctdb_db, struct ctdb_call_state);
737 CTDB_NO_MEMORY_NULL(ctdb, state);
738 state->call = talloc(state, struct ctdb_call);
739 CTDB_NO_MEMORY_NULL(ctdb, state->call);
741 state->reqid = ctdb_reqid_new(ctdb, state);
742 state->ctdb_db = ctdb_db;
743 talloc_set_destructor(state, ctdb_call_destructor);
745 len = offsetof(struct ctdb_req_call, data) + call->key.dsize + call->call_data.dsize;
746 state->c = ctdb_transport_allocate(ctdb, state, CTDB_REQ_CALL, len,
747 struct ctdb_req_call);
748 CTDB_NO_MEMORY_NULL(ctdb, state->c);
749 state->c->hdr.destnode = header->dmaster;
751 /* this limits us to 16k outstanding messages - not unreasonable */
752 state->c->hdr.reqid = state->reqid;
753 state->c->flags = call->flags;
754 state->c->db_id = ctdb_db->db_id;
755 state->c->callid = call->call_id;
756 state->c->hopcount = 0;
757 state->c->keylen = call->key.dsize;
758 state->c->calldatalen = call->call_data.dsize;
759 memcpy(&state->c->data[0], call->key.dptr, call->key.dsize);
760 memcpy(&state->c->data[call->key.dsize],
761 call->call_data.dptr, call->call_data.dsize);
762 *(state->call) = *call;
763 state->call->call_data.dptr = &state->c->data[call->key.dsize];
764 state->call->key.dptr = &state->c->data[0];
766 state->state = CTDB_CALL_WAIT;
767 state->generation = ctdb->vnn_map->generation;
769 DLIST_ADD(ctdb->pending_calls, state);
771 ctdb_queue_packet(ctdb, &state->c->hdr);
777 make a remote ctdb call - async recv - called in daemon context
779 This is called when the program wants to wait for a ctdb_call to complete and get the
780 results. This call will block unless the call has already completed.
782 int ctdb_daemon_call_recv(struct ctdb_call_state *state, struct ctdb_call *call)
784 while (state->state < CTDB_CALL_DONE) {
785 event_loop_once(state->ctdb_db->ctdb->ev);
787 if (state->state != CTDB_CALL_DONE) {
788 ctdb_set_error(state->ctdb_db->ctdb, "%s", state->errmsg);
793 if (state->call->reply_data.dsize) {
794 call->reply_data.dptr = talloc_memdup(call,
795 state->call->reply_data.dptr,
796 state->call->reply_data.dsize);
797 call->reply_data.dsize = state->call->reply_data.dsize;
799 call->reply_data.dptr = NULL;
800 call->reply_data.dsize = 0;
802 call->status = state->call->status;
809 send a keepalive packet to the other node
811 void ctdb_send_keepalive(struct ctdb_context *ctdb, uint32_t destnode)
813 struct ctdb_req_keepalive *r;
815 if (ctdb->methods == NULL) {
816 DEBUG(DEBUG_INFO,(__location__ " Failed to send keepalive. Transport is DOWN\n"));
820 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_KEEPALIVE,
821 sizeof(struct ctdb_req_keepalive),
822 struct ctdb_req_keepalive);
823 CTDB_NO_MEMORY_FATAL(ctdb, r);
824 r->hdr.destnode = destnode;
827 CTDB_INCREMENT_STAT(ctdb, keepalive_packets_sent);
829 ctdb_queue_packet(ctdb, &r->hdr);