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 (data->dsize != 0) {
205 header->flags |= CTDB_REC_FLAG_MIGRATED_WITH_DATA;
209 if (lmaster == ctdb->pnn) {
210 ctdb_send_dmaster_reply(ctdb_db, header, *key, *data,
211 c->hdr.srcnode, c->hdr.reqid);
215 len = offsetof(struct ctdb_req_dmaster, data) + key->dsize + data->dsize;
216 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_DMASTER, len,
217 struct ctdb_req_dmaster);
218 CTDB_NO_MEMORY_FATAL(ctdb, r);
219 r->hdr.destnode = lmaster;
220 r->hdr.reqid = c->hdr.reqid;
222 r->rsn = header->rsn;
223 r->dmaster = c->hdr.srcnode;
224 r->keylen = key->dsize;
225 r->datalen = data->dsize;
226 memcpy(&r->data[0], key->dptr, key->dsize);
227 memcpy(&r->data[key->dsize], data->dptr, data->dsize);
229 header->dmaster = c->hdr.srcnode;
232 && lmaster != ctdb->pnn
233 && (header->flags & CTDB_REC_FLAG_MIGRATED_WITH_DATA) == 0) {
234 if (ctdb_ltdb_delete(ctdb_db, *key) != 0) {
235 ctdb_fatal(ctdb, "Failed to delete empty record when migrating it off the node");
238 if (ctdb_ltdb_store(ctdb_db, *key, header, *data) != 0) {
239 ctdb_fatal(ctdb, "Failed to store record in ctdb_call_send_dmaster");
243 ctdb_queue_packet(ctdb, &r->hdr);
249 called when a CTDB_REPLY_DMASTER packet comes in, or when the lmaster
250 gets a CTDB_REQUEST_DMASTER for itself. We become the dmaster.
252 must be called with the chainlock held. This function releases the chainlock
254 static void ctdb_become_dmaster(struct ctdb_db_context *ctdb_db,
255 struct ctdb_req_header *hdr,
256 TDB_DATA key, TDB_DATA data,
259 struct ctdb_call_state *state;
260 struct ctdb_context *ctdb = ctdb_db->ctdb;
261 struct ctdb_ltdb_header header;
264 DEBUG(DEBUG_DEBUG,("pnn %u dmaster response %08x\n", ctdb->pnn, ctdb_hash(&key)));
267 header.rsn = rsn + 1;
268 header.dmaster = ctdb->pnn;
270 if (data.dsize != 0) {
271 header.flags |= CTDB_REC_FLAG_MIGRATED_WITH_DATA;
274 if (ctdb_ltdb_store(ctdb_db, key, &header, data) != 0) {
275 ctdb_fatal(ctdb, "ctdb_reply_dmaster store failed\n");
277 ret = ctdb_ltdb_unlock(ctdb_db, key);
279 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
284 state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_call_state);
287 DEBUG(DEBUG_ERR,("pnn %u Invalid reqid %u in ctdb_become_dmaster from node %u\n",
288 ctdb->pnn, hdr->reqid, hdr->srcnode));
290 ret = ctdb_ltdb_unlock(ctdb_db, key);
292 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
297 if (key.dsize != state->call->key.dsize || memcmp(key.dptr, state->call->key.dptr, key.dsize)) {
298 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));
300 ret = ctdb_ltdb_unlock(ctdb_db, key);
302 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
307 if (hdr->reqid != state->reqid) {
308 /* we found a record but it was the wrong one */
309 DEBUG(DEBUG_ERR, ("Dropped orphan in ctdb_become_dmaster with reqid:%u\n from node %u", hdr->reqid, hdr->srcnode));
311 ret = ctdb_ltdb_unlock(ctdb_db, key);
313 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
318 ctdb_call_local(ctdb_db, state->call, &header, state, &data, ctdb->pnn);
320 ret = ctdb_ltdb_unlock(ctdb_db, state->call->key);
322 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
325 state->state = CTDB_CALL_DONE;
326 if (state->async.fn) {
327 state->async.fn(state);
334 called when a CTDB_REQ_DMASTER packet comes in
336 this comes into the lmaster for a record when the current dmaster
337 wants to give up the dmaster role and give it to someone else
339 void ctdb_request_dmaster(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
341 struct ctdb_req_dmaster *c = (struct ctdb_req_dmaster *)hdr;
342 TDB_DATA key, data, data2;
343 struct ctdb_ltdb_header header;
344 struct ctdb_db_context *ctdb_db;
348 key.dsize = c->keylen;
349 data.dptr = c->data + c->keylen;
350 data.dsize = c->datalen;
352 ctdb_db = find_ctdb_db(ctdb, c->db_id);
354 ctdb_send_error(ctdb, hdr, -1,
355 "Unknown database in request. db_id==0x%08x",
360 /* fetch the current record */
361 ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, key, &header, hdr, &data2,
362 ctdb_call_input_pkt, ctdb, False);
364 ctdb_fatal(ctdb, "ctdb_req_dmaster failed to fetch record");
368 DEBUG(DEBUG_INFO,(__location__ " deferring ctdb_request_dmaster\n"));
372 if (data.dsize != 0) {
373 header.flags |= CTDB_REC_FLAG_MIGRATED_WITH_DATA;
376 if (ctdb_lmaster(ctdb, &key) != ctdb->pnn) {
377 DEBUG(DEBUG_ALERT,("pnn %u dmaster request to non-lmaster lmaster=%u gen=%u curgen=%u\n",
378 ctdb->pnn, ctdb_lmaster(ctdb, &key),
379 hdr->generation, ctdb->vnn_map->generation));
380 ctdb_fatal(ctdb, "ctdb_req_dmaster to non-lmaster");
383 DEBUG(DEBUG_DEBUG,("pnn %u dmaster request on %08x for %u from %u\n",
384 ctdb->pnn, ctdb_hash(&key), c->dmaster, c->hdr.srcnode));
386 /* its a protocol error if the sending node is not the current dmaster */
387 if (header.dmaster != hdr->srcnode) {
388 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",
389 ctdb->pnn, c->dmaster, hdr->srcnode, header.dmaster, ctdb_hash(&key),
390 ctdb_db->db_id, hdr->generation, ctdb->vnn_map->generation,
391 (unsigned long long)c->rsn, (unsigned long long)header.rsn, c->hdr.reqid,
392 (key.dsize >= 4)?(*(uint32_t *)key.dptr):0));
393 if (header.rsn != 0 || header.dmaster != ctdb->pnn) {
394 ctdb_fatal(ctdb, "ctdb_req_dmaster from non-master");
399 if (header.rsn > c->rsn) {
400 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",
401 ctdb->pnn, c->dmaster, hdr->srcnode, header.dmaster, ctdb_hash(&key),
402 ctdb_db->db_id, hdr->generation, ctdb->vnn_map->generation,
403 (unsigned long long)c->rsn, (unsigned long long)header.rsn, c->hdr.reqid));
406 /* use the rsn from the sending node */
409 /* check if the new dmaster is the lmaster, in which case we
410 skip the dmaster reply */
411 if (c->dmaster == ctdb->pnn) {
412 ctdb_become_dmaster(ctdb_db, hdr, key, data, c->rsn);
414 ctdb_send_dmaster_reply(ctdb_db, &header, key, data, c->dmaster, hdr->reqid);
416 ret = ctdb_ltdb_unlock(ctdb_db, key);
418 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
425 called when a CTDB_REQ_CALL packet comes in
427 void ctdb_request_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
429 struct ctdb_req_call *c = (struct ctdb_req_call *)hdr;
431 struct ctdb_reply_call *r;
433 struct ctdb_ltdb_header header;
434 struct ctdb_call *call;
435 struct ctdb_db_context *ctdb_db;
437 if (ctdb->methods == NULL) {
438 DEBUG(DEBUG_INFO,(__location__ " Failed ctdb_request_call. Transport is DOWN\n"));
443 ctdb_db = find_ctdb_db(ctdb, c->db_id);
445 ctdb_send_error(ctdb, hdr, -1,
446 "Unknown database in request. db_id==0x%08x",
451 call = talloc(hdr, struct ctdb_call);
452 CTDB_NO_MEMORY_FATAL(ctdb, call);
454 call->call_id = c->callid;
455 call->key.dptr = c->data;
456 call->key.dsize = c->keylen;
457 call->call_data.dptr = c->data + c->keylen;
458 call->call_data.dsize = c->calldatalen;
460 /* determine if we are the dmaster for this key. This also
461 fetches the record data (if any), thus avoiding a 2nd fetch of the data
462 if the call will be answered locally */
464 ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, call->key, &header, hdr, &data,
465 ctdb_call_input_pkt, ctdb, False);
467 ctdb_send_error(ctdb, hdr, ret, "ltdb fetch failed in ctdb_request_call");
471 DEBUG(DEBUG_INFO,(__location__ " deferred ctdb_request_call\n"));
475 /* if we are not the dmaster, then send a redirect to the
477 if (header.dmaster != ctdb->pnn) {
478 talloc_free(data.dptr);
479 ctdb_call_send_redirect(ctdb, call->key, c, &header);
481 ret = ctdb_ltdb_unlock(ctdb_db, call->key);
483 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
488 CTDB_UPDATE_STAT(ctdb, max_hop_count, c->hopcount);
490 /* if this nodes has done enough consecutive calls on the same record
491 then give them the record
492 or if the node requested an immediate migration
494 if ( c->hdr.srcnode != ctdb->pnn &&
495 ((header.laccessor == c->hdr.srcnode
496 && header.lacount >= ctdb->tunable.max_lacount)
497 || (c->flags & CTDB_IMMEDIATE_MIGRATION)) ) {
498 if (ctdb_db->transaction_active) {
499 DEBUG(DEBUG_INFO, (__location__ " refusing migration"
500 " of key %s while transaction is active\n",
501 (char *)call->key.dptr));
503 DEBUG(DEBUG_DEBUG,("pnn %u starting migration of %08x to %u\n",
504 ctdb->pnn, ctdb_hash(&(call->key)), c->hdr.srcnode));
505 ctdb_call_send_dmaster(ctdb_db, c, &header, &(call->key), &data);
506 talloc_free(data.dptr);
508 ret = ctdb_ltdb_unlock(ctdb_db, call->key);
510 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
516 ctdb_call_local(ctdb_db, call, &header, hdr, &data, c->hdr.srcnode);
518 ret = ctdb_ltdb_unlock(ctdb_db, call->key);
520 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
523 len = offsetof(struct ctdb_reply_call, data) + call->reply_data.dsize;
524 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REPLY_CALL, len,
525 struct ctdb_reply_call);
526 CTDB_NO_MEMORY_FATAL(ctdb, r);
527 r->hdr.destnode = hdr->srcnode;
528 r->hdr.reqid = hdr->reqid;
529 r->status = call->status;
530 r->datalen = call->reply_data.dsize;
531 if (call->reply_data.dsize) {
532 memcpy(&r->data[0], call->reply_data.dptr, call->reply_data.dsize);
535 ctdb_queue_packet(ctdb, &r->hdr);
541 called when a CTDB_REPLY_CALL packet comes in
543 This packet comes in response to a CTDB_REQ_CALL request packet. It
544 contains any reply data from the call
546 void ctdb_reply_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
548 struct ctdb_reply_call *c = (struct ctdb_reply_call *)hdr;
549 struct ctdb_call_state *state;
551 state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_call_state);
553 DEBUG(DEBUG_ERR, (__location__ " reqid %u not found\n", hdr->reqid));
557 if (hdr->reqid != state->reqid) {
558 /* we found a record but it was the wrong one */
559 DEBUG(DEBUG_ERR, ("Dropped orphaned call reply with reqid:%u\n",hdr->reqid));
563 state->call->reply_data.dptr = c->data;
564 state->call->reply_data.dsize = c->datalen;
565 state->call->status = c->status;
567 talloc_steal(state, c);
569 state->state = CTDB_CALL_DONE;
570 if (state->async.fn) {
571 state->async.fn(state);
577 called when a CTDB_REPLY_DMASTER packet comes in
579 This packet comes in from the lmaster response to a CTDB_REQ_CALL
580 request packet. It means that the current dmaster wants to give us
583 void ctdb_reply_dmaster(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
585 struct ctdb_reply_dmaster *c = (struct ctdb_reply_dmaster *)hdr;
586 struct ctdb_db_context *ctdb_db;
590 ctdb_db = find_ctdb_db(ctdb, c->db_id);
591 if (ctdb_db == NULL) {
592 DEBUG(DEBUG_ERR,("Unknown db_id 0x%x in ctdb_reply_dmaster\n", c->db_id));
597 key.dsize = c->keylen;
598 data.dptr = &c->data[key.dsize];
599 data.dsize = c->datalen;
601 ret = ctdb_ltdb_lock_requeue(ctdb_db, key, hdr,
602 ctdb_call_input_pkt, ctdb, False);
607 DEBUG(DEBUG_ERR,(__location__ " Failed to get lock in ctdb_reply_dmaster\n"));
611 ctdb_become_dmaster(ctdb_db, hdr, key, data, c->rsn);
616 called when a CTDB_REPLY_ERROR packet comes in
618 void ctdb_reply_error(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
620 struct ctdb_reply_error *c = (struct ctdb_reply_error *)hdr;
621 struct ctdb_call_state *state;
623 state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_call_state);
625 DEBUG(DEBUG_ERR,("pnn %u Invalid reqid %u in ctdb_reply_error\n",
626 ctdb->pnn, hdr->reqid));
630 if (hdr->reqid != state->reqid) {
631 /* we found a record but it was the wrong one */
632 DEBUG(DEBUG_ERR, ("Dropped orphaned error reply with reqid:%u\n",hdr->reqid));
636 talloc_steal(state, c);
638 state->state = CTDB_CALL_ERROR;
639 state->errmsg = (char *)c->msg;
640 if (state->async.fn) {
641 state->async.fn(state);
649 static int ctdb_call_destructor(struct ctdb_call_state *state)
651 DLIST_REMOVE(state->ctdb_db->ctdb->pending_calls, state);
652 ctdb_reqid_remove(state->ctdb_db->ctdb, state->reqid);
658 called when a ctdb_call needs to be resent after a reconfigure event
660 static void ctdb_call_resend(struct ctdb_call_state *state)
662 struct ctdb_context *ctdb = state->ctdb_db->ctdb;
664 state->generation = ctdb->vnn_map->generation;
666 /* use a new reqid, in case the old reply does eventually come in */
667 ctdb_reqid_remove(ctdb, state->reqid);
668 state->reqid = ctdb_reqid_new(ctdb, state);
669 state->c->hdr.reqid = state->reqid;
671 /* update the generation count for this request, so its valid with the new vnn_map */
672 state->c->hdr.generation = state->generation;
674 /* send the packet to ourselves, it will be redirected appropriately */
675 state->c->hdr.destnode = ctdb->pnn;
677 ctdb_queue_packet(ctdb, &state->c->hdr);
678 DEBUG(DEBUG_NOTICE,("resent ctdb_call\n"));
682 resend all pending calls on recovery
684 void ctdb_call_resend_all(struct ctdb_context *ctdb)
686 struct ctdb_call_state *state, *next;
687 for (state=ctdb->pending_calls;state;state=next) {
689 ctdb_call_resend(state);
694 this allows the caller to setup a async.fn
696 static void call_local_trigger(struct event_context *ev, struct timed_event *te,
697 struct timeval t, void *private_data)
699 struct ctdb_call_state *state = talloc_get_type(private_data, struct ctdb_call_state);
700 if (state->async.fn) {
701 state->async.fn(state);
707 construct an event driven local ctdb_call
709 this is used so that locally processed ctdb_call requests are processed
710 in an event driven manner
712 struct ctdb_call_state *ctdb_call_local_send(struct ctdb_db_context *ctdb_db,
713 struct ctdb_call *call,
714 struct ctdb_ltdb_header *header,
717 struct ctdb_call_state *state;
718 struct ctdb_context *ctdb = ctdb_db->ctdb;
721 state = talloc_zero(ctdb_db, struct ctdb_call_state);
722 CTDB_NO_MEMORY_NULL(ctdb, state);
724 talloc_steal(state, data->dptr);
726 state->state = CTDB_CALL_DONE;
727 state->call = talloc(state, struct ctdb_call);
728 CTDB_NO_MEMORY_NULL(ctdb, state->call);
729 *(state->call) = *call;
730 state->ctdb_db = ctdb_db;
732 ret = ctdb_call_local(ctdb_db, state->call, header, state, data, ctdb->pnn);
734 event_add_timed(ctdb->ev, state, timeval_zero(), call_local_trigger, state);
741 make a remote ctdb call - async send. Called in daemon context.
743 This constructs a ctdb_call request and queues it for processing.
744 This call never blocks.
746 struct ctdb_call_state *ctdb_daemon_call_send_remote(struct ctdb_db_context *ctdb_db,
747 struct ctdb_call *call,
748 struct ctdb_ltdb_header *header)
751 struct ctdb_call_state *state;
752 struct ctdb_context *ctdb = ctdb_db->ctdb;
754 if (ctdb->methods == NULL) {
755 DEBUG(DEBUG_INFO,(__location__ " Failed send packet. Transport is down\n"));
759 state = talloc_zero(ctdb_db, struct ctdb_call_state);
760 CTDB_NO_MEMORY_NULL(ctdb, state);
761 state->call = talloc(state, struct ctdb_call);
762 CTDB_NO_MEMORY_NULL(ctdb, state->call);
764 state->reqid = ctdb_reqid_new(ctdb, state);
765 state->ctdb_db = ctdb_db;
766 talloc_set_destructor(state, ctdb_call_destructor);
768 len = offsetof(struct ctdb_req_call, data) + call->key.dsize + call->call_data.dsize;
769 state->c = ctdb_transport_allocate(ctdb, state, CTDB_REQ_CALL, len,
770 struct ctdb_req_call);
771 CTDB_NO_MEMORY_NULL(ctdb, state->c);
772 state->c->hdr.destnode = header->dmaster;
774 /* this limits us to 16k outstanding messages - not unreasonable */
775 state->c->hdr.reqid = state->reqid;
776 state->c->flags = call->flags;
777 state->c->db_id = ctdb_db->db_id;
778 state->c->callid = call->call_id;
779 state->c->hopcount = 0;
780 state->c->keylen = call->key.dsize;
781 state->c->calldatalen = call->call_data.dsize;
782 memcpy(&state->c->data[0], call->key.dptr, call->key.dsize);
783 memcpy(&state->c->data[call->key.dsize],
784 call->call_data.dptr, call->call_data.dsize);
785 *(state->call) = *call;
786 state->call->call_data.dptr = &state->c->data[call->key.dsize];
787 state->call->key.dptr = &state->c->data[0];
789 state->state = CTDB_CALL_WAIT;
790 state->generation = ctdb->vnn_map->generation;
792 DLIST_ADD(ctdb->pending_calls, state);
794 ctdb_queue_packet(ctdb, &state->c->hdr);
800 make a remote ctdb call - async recv - called in daemon context
802 This is called when the program wants to wait for a ctdb_call to complete and get the
803 results. This call will block unless the call has already completed.
805 int ctdb_daemon_call_recv(struct ctdb_call_state *state, struct ctdb_call *call)
807 while (state->state < CTDB_CALL_DONE) {
808 event_loop_once(state->ctdb_db->ctdb->ev);
810 if (state->state != CTDB_CALL_DONE) {
811 ctdb_set_error(state->ctdb_db->ctdb, "%s", state->errmsg);
816 if (state->call->reply_data.dsize) {
817 call->reply_data.dptr = talloc_memdup(call,
818 state->call->reply_data.dptr,
819 state->call->reply_data.dsize);
820 call->reply_data.dsize = state->call->reply_data.dsize;
822 call->reply_data.dptr = NULL;
823 call->reply_data.dsize = 0;
825 call->status = state->call->status;
832 send a keepalive packet to the other node
834 void ctdb_send_keepalive(struct ctdb_context *ctdb, uint32_t destnode)
836 struct ctdb_req_keepalive *r;
838 if (ctdb->methods == NULL) {
839 DEBUG(DEBUG_INFO,(__location__ " Failed to send keepalive. Transport is DOWN\n"));
843 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_KEEPALIVE,
844 sizeof(struct ctdb_req_keepalive),
845 struct ctdb_req_keepalive);
846 CTDB_NO_MEMORY_FATAL(ctdb, r);
847 r->hdr.destnode = destnode;
850 CTDB_INCREMENT_STAT(ctdb, keepalive_packets_sent);
852 ctdb_queue_packet(ctdb, &r->hdr);