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 * The logic behind this function is this:
107 * A client wants to grab a record and sends a CTDB_REQ_CALL packet
108 * to its local ctdb (ctdb_request_call). If the node is not itself
109 * the record's DMASTER, it first redirects the packet to the
110 * record's LMASTER. The LMASTER then redirects the call packet to
111 * the current DMASTER. But there is a race: The record may have
112 * been migrated off the DMASTER while the redirected packet is
113 * on the wire (or in the local queue). So in case the record has
114 * migrated off the new destinaton of the call packet, instead of
115 * going back to the LMASTER to get the new DMASTER, we try to
116 * reduce rountrips by fist chasing the record a couple of times
117 * before giving up the direct chase and finally going back to the
118 * LMASTER (again). Note that this works because auf this: When
119 * a record is migrated off a node, then the new DMASTER is stored
120 * in the record's copy on the former DMASTER.
122 * The maxiumum number of attempts for direct chase to make before
123 * going back to the LMASTER is configurable by the tunable
124 * "MaxRedirectCount".
126 static void ctdb_call_send_redirect(struct ctdb_context *ctdb,
128 struct ctdb_req_call *c,
129 struct ctdb_ltdb_header *header)
132 uint32_t lmaster = ctdb_lmaster(ctdb, &key);
133 if (ctdb->pnn == lmaster) {
134 c->hdr.destnode = header->dmaster;
135 } else if ((c->hopcount % ctdb->tunable.max_redirect_count) == 0) {
136 c->hdr.destnode = lmaster;
138 c->hdr.destnode = header->dmaster;
141 ctdb_queue_packet(ctdb, &c->hdr);
148 caller must have the chainlock before calling this routine. Caller must be
151 static void ctdb_send_dmaster_reply(struct ctdb_db_context *ctdb_db,
152 struct ctdb_ltdb_header *header,
153 TDB_DATA key, TDB_DATA data,
154 uint32_t new_dmaster,
157 struct ctdb_context *ctdb = ctdb_db->ctdb;
158 struct ctdb_reply_dmaster *r;
162 if (ctdb->pnn != ctdb_lmaster(ctdb, &key)) {
163 DEBUG(DEBUG_ALERT,(__location__ " Caller is not lmaster!\n"));
167 header->dmaster = new_dmaster;
168 ret = ctdb_ltdb_store(ctdb_db, key, header, data);
170 ctdb_fatal(ctdb, "ctdb_send_dmaster_reply unable to update dmaster");
174 if (ctdb->methods == NULL) {
175 ctdb_fatal(ctdb, "ctdb_send_dmaster_reply cant update dmaster since transport is down");
179 /* put the packet on a temporary context, allowing us to safely free
180 it below even if ctdb_reply_dmaster() has freed it already */
181 tmp_ctx = talloc_new(ctdb);
183 /* send the CTDB_REPLY_DMASTER */
184 len = offsetof(struct ctdb_reply_dmaster, data) + key.dsize + data.dsize;
185 r = ctdb_transport_allocate(ctdb, tmp_ctx, CTDB_REPLY_DMASTER, len,
186 struct ctdb_reply_dmaster);
187 CTDB_NO_MEMORY_FATAL(ctdb, r);
189 r->hdr.destnode = new_dmaster;
190 r->hdr.reqid = reqid;
191 r->rsn = header->rsn;
192 r->keylen = key.dsize;
193 r->datalen = data.dsize;
194 r->db_id = ctdb_db->db_id;
195 memcpy(&r->data[0], key.dptr, key.dsize);
196 memcpy(&r->data[key.dsize], data.dptr, data.dsize);
198 ctdb_queue_packet(ctdb, &r->hdr);
200 talloc_free(tmp_ctx);
204 send a dmaster request (give another node the dmaster for a record)
206 This is always sent to the lmaster, which ensures that the lmaster
207 always knows who the dmaster is. The lmaster will then send a
208 CTDB_REPLY_DMASTER to the new dmaster
210 static void ctdb_call_send_dmaster(struct ctdb_db_context *ctdb_db,
211 struct ctdb_req_call *c,
212 struct ctdb_ltdb_header *header,
213 TDB_DATA *key, TDB_DATA *data)
215 struct ctdb_req_dmaster *r;
216 struct ctdb_context *ctdb = ctdb_db->ctdb;
218 uint32_t lmaster = ctdb_lmaster(ctdb, key);
220 if (ctdb->methods == NULL) {
221 ctdb_fatal(ctdb, "Failed ctdb_call_send_dmaster since transport is down");
225 if (data->dsize != 0) {
226 header->flags |= CTDB_REC_FLAG_MIGRATED_WITH_DATA;
229 if (lmaster == ctdb->pnn) {
230 ctdb_send_dmaster_reply(ctdb_db, header, *key, *data,
231 c->hdr.srcnode, c->hdr.reqid);
235 len = offsetof(struct ctdb_req_dmaster, data) + key->dsize + data->dsize;
236 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_DMASTER, len,
237 struct ctdb_req_dmaster);
238 CTDB_NO_MEMORY_FATAL(ctdb, r);
239 r->hdr.destnode = lmaster;
240 r->hdr.reqid = c->hdr.reqid;
242 r->rsn = header->rsn;
243 r->dmaster = c->hdr.srcnode;
244 r->keylen = key->dsize;
245 r->datalen = data->dsize;
246 memcpy(&r->data[0], key->dptr, key->dsize);
247 memcpy(&r->data[key->dsize], data->dptr, data->dsize);
249 header->dmaster = c->hdr.srcnode;
250 if (ctdb_ltdb_store(ctdb_db, *key, header, *data) != 0) {
251 ctdb_fatal(ctdb, "Failed to store record in ctdb_call_send_dmaster");
254 ctdb_queue_packet(ctdb, &r->hdr);
260 called when a CTDB_REPLY_DMASTER packet comes in, or when the lmaster
261 gets a CTDB_REQUEST_DMASTER for itself. We become the dmaster.
263 must be called with the chainlock held. This function releases the chainlock
265 static void ctdb_become_dmaster(struct ctdb_db_context *ctdb_db,
266 struct ctdb_req_header *hdr,
267 TDB_DATA key, TDB_DATA data,
270 struct ctdb_call_state *state;
271 struct ctdb_context *ctdb = ctdb_db->ctdb;
272 struct ctdb_ltdb_header header;
275 DEBUG(DEBUG_DEBUG,("pnn %u dmaster response %08x\n", ctdb->pnn, ctdb_hash(&key)));
278 header.rsn = rsn + 1;
279 header.dmaster = ctdb->pnn;
281 if (ctdb_ltdb_store(ctdb_db, key, &header, data) != 0) {
282 ctdb_fatal(ctdb, "ctdb_reply_dmaster store failed\n");
284 ret = ctdb_ltdb_unlock(ctdb_db, key);
286 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
291 state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_call_state);
294 DEBUG(DEBUG_ERR,("pnn %u Invalid reqid %u in ctdb_become_dmaster from node %u\n",
295 ctdb->pnn, hdr->reqid, hdr->srcnode));
297 ret = ctdb_ltdb_unlock(ctdb_db, key);
299 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
304 if (key.dsize != state->call->key.dsize || memcmp(key.dptr, state->call->key.dptr, key.dsize)) {
305 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));
307 ret = ctdb_ltdb_unlock(ctdb_db, key);
309 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
314 if (hdr->reqid != state->reqid) {
315 /* we found a record but it was the wrong one */
316 DEBUG(DEBUG_ERR, ("Dropped orphan in ctdb_become_dmaster with reqid:%u\n from node %u", hdr->reqid, hdr->srcnode));
318 ret = ctdb_ltdb_unlock(ctdb_db, key);
320 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
325 ctdb_call_local(ctdb_db, state->call, &header, state, &data);
327 ret = ctdb_ltdb_unlock(ctdb_db, state->call->key);
329 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
332 state->state = CTDB_CALL_DONE;
333 if (state->async.fn) {
334 state->async.fn(state);
341 called when a CTDB_REQ_DMASTER packet comes in
343 this comes into the lmaster for a record when the current dmaster
344 wants to give up the dmaster role and give it to someone else
346 void ctdb_request_dmaster(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
348 struct ctdb_req_dmaster *c = (struct ctdb_req_dmaster *)hdr;
349 TDB_DATA key, data, data2;
350 struct ctdb_ltdb_header header;
351 struct ctdb_db_context *ctdb_db;
355 key.dsize = c->keylen;
356 data.dptr = c->data + c->keylen;
357 data.dsize = c->datalen;
359 ctdb_db = find_ctdb_db(ctdb, c->db_id);
361 ctdb_send_error(ctdb, hdr, -1,
362 "Unknown database in request. db_id==0x%08x",
367 /* fetch the current record */
368 ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, key, &header, hdr, &data2,
369 ctdb_call_input_pkt, ctdb, False);
371 ctdb_fatal(ctdb, "ctdb_req_dmaster failed to fetch record");
375 DEBUG(DEBUG_INFO,(__location__ " deferring ctdb_request_dmaster\n"));
379 if (ctdb_lmaster(ctdb, &key) != ctdb->pnn) {
380 DEBUG(DEBUG_ALERT,("pnn %u dmaster request to non-lmaster lmaster=%u gen=%u curgen=%u\n",
381 ctdb->pnn, ctdb_lmaster(ctdb, &key),
382 hdr->generation, ctdb->vnn_map->generation));
383 ctdb_fatal(ctdb, "ctdb_req_dmaster to non-lmaster");
386 DEBUG(DEBUG_DEBUG,("pnn %u dmaster request on %08x for %u from %u\n",
387 ctdb->pnn, ctdb_hash(&key), c->dmaster, c->hdr.srcnode));
389 /* its a protocol error if the sending node is not the current dmaster */
390 if (header.dmaster != hdr->srcnode) {
391 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",
392 ctdb->pnn, c->dmaster, hdr->srcnode, header.dmaster, ctdb_hash(&key),
393 ctdb_db->db_id, hdr->generation, ctdb->vnn_map->generation,
394 (unsigned long long)c->rsn, (unsigned long long)header.rsn, c->hdr.reqid,
395 (key.dsize >= 4)?(*(uint32_t *)key.dptr):0));
396 if (header.rsn != 0 || header.dmaster != ctdb->pnn) {
397 DEBUG(DEBUG_ERR,("ctdb_req_dmaster from non-master. Force a recovery.\n"));
399 ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
404 if (header.rsn > c->rsn) {
405 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",
406 ctdb->pnn, c->dmaster, hdr->srcnode, header.dmaster, ctdb_hash(&key),
407 ctdb_db->db_id, hdr->generation, ctdb->vnn_map->generation,
408 (unsigned long long)c->rsn, (unsigned long long)header.rsn, c->hdr.reqid));
411 /* use the rsn from the sending node */
414 /* check if the new dmaster is the lmaster, in which case we
415 skip the dmaster reply */
416 if (c->dmaster == ctdb->pnn) {
417 ctdb_become_dmaster(ctdb_db, hdr, key, data, c->rsn);
419 ctdb_send_dmaster_reply(ctdb_db, &header, key, data, c->dmaster, hdr->reqid);
421 ret = ctdb_ltdb_unlock(ctdb_db, key);
423 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
430 called when a CTDB_REQ_CALL packet comes in
432 void ctdb_request_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
434 struct ctdb_req_call *c = (struct ctdb_req_call *)hdr;
436 struct ctdb_reply_call *r;
438 struct ctdb_ltdb_header header;
439 struct ctdb_call *call;
440 struct ctdb_db_context *ctdb_db;
442 if (ctdb->methods == NULL) {
443 DEBUG(DEBUG_INFO,(__location__ " Failed ctdb_request_call. Transport is DOWN\n"));
448 ctdb_db = find_ctdb_db(ctdb, c->db_id);
450 ctdb_send_error(ctdb, hdr, -1,
451 "Unknown database in request. db_id==0x%08x",
456 call = talloc(hdr, struct ctdb_call);
457 CTDB_NO_MEMORY_FATAL(ctdb, call);
459 call->call_id = c->callid;
460 call->key.dptr = c->data;
461 call->key.dsize = c->keylen;
462 call->call_data.dptr = c->data + c->keylen;
463 call->call_data.dsize = c->calldatalen;
465 /* determine if we are the dmaster for this key. This also
466 fetches the record data (if any), thus avoiding a 2nd fetch of the data
467 if the call will be answered locally */
469 ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, call->key, &header, hdr, &data,
470 ctdb_call_input_pkt, ctdb, False);
472 ctdb_send_error(ctdb, hdr, ret, "ltdb fetch failed in ctdb_request_call");
476 DEBUG(DEBUG_INFO,(__location__ " deferred ctdb_request_call\n"));
480 /* if we are not the dmaster, then send a redirect to the
482 if (header.dmaster != ctdb->pnn) {
483 talloc_free(data.dptr);
484 ctdb_call_send_redirect(ctdb, call->key, c, &header);
486 ret = ctdb_ltdb_unlock(ctdb_db, call->key);
488 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
493 CTDB_UPDATE_STAT(ctdb, max_hop_count, c->hopcount);
495 /* Try if possible to migrate the record off to the caller node.
496 * From the clients perspective a fetch of the data is just as
497 * expensive as a migration.
499 if (c->hdr.srcnode != ctdb->pnn) {
500 if (ctdb_db->transaction_active) {
501 DEBUG(DEBUG_INFO, (__location__ " refusing migration"
502 " of key %s while transaction is active\n",
503 (char *)call->key.dptr));
505 DEBUG(DEBUG_DEBUG,("pnn %u starting migration of %08x to %u\n",
506 ctdb->pnn, ctdb_hash(&(call->key)), c->hdr.srcnode));
507 ctdb_call_send_dmaster(ctdb_db, c, &header, &(call->key), &data);
508 talloc_free(data.dptr);
510 ret = ctdb_ltdb_unlock(ctdb_db, call->key);
512 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
518 ctdb_call_local(ctdb_db, call, &header, hdr, &data);
520 ret = ctdb_ltdb_unlock(ctdb_db, call->key);
522 DEBUG(DEBUG_ERR,(__location__ " ctdb_ltdb_unlock() failed with error %d\n", ret));
525 len = offsetof(struct ctdb_reply_call, data) + call->reply_data.dsize;
526 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REPLY_CALL, len,
527 struct ctdb_reply_call);
528 CTDB_NO_MEMORY_FATAL(ctdb, r);
529 r->hdr.destnode = hdr->srcnode;
530 r->hdr.reqid = hdr->reqid;
531 r->status = call->status;
532 r->datalen = call->reply_data.dsize;
533 if (call->reply_data.dsize) {
534 memcpy(&r->data[0], call->reply_data.dptr, call->reply_data.dsize);
537 ctdb_queue_packet(ctdb, &r->hdr);
543 called when a CTDB_REPLY_CALL packet comes in
545 This packet comes in response to a CTDB_REQ_CALL request packet. It
546 contains any reply data from the call
548 void ctdb_reply_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
550 struct ctdb_reply_call *c = (struct ctdb_reply_call *)hdr;
551 struct ctdb_call_state *state;
553 state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_call_state);
555 DEBUG(DEBUG_ERR, (__location__ " reqid %u not found\n", hdr->reqid));
559 if (hdr->reqid != state->reqid) {
560 /* we found a record but it was the wrong one */
561 DEBUG(DEBUG_ERR, ("Dropped orphaned call reply with reqid:%u\n",hdr->reqid));
565 state->call->reply_data.dptr = c->data;
566 state->call->reply_data.dsize = c->datalen;
567 state->call->status = c->status;
569 talloc_steal(state, c);
571 state->state = CTDB_CALL_DONE;
572 if (state->async.fn) {
573 state->async.fn(state);
579 called when a CTDB_REPLY_DMASTER packet comes in
581 This packet comes in from the lmaster response to a CTDB_REQ_CALL
582 request packet. It means that the current dmaster wants to give us
585 void ctdb_reply_dmaster(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
587 struct ctdb_reply_dmaster *c = (struct ctdb_reply_dmaster *)hdr;
588 struct ctdb_db_context *ctdb_db;
592 ctdb_db = find_ctdb_db(ctdb, c->db_id);
593 if (ctdb_db == NULL) {
594 DEBUG(DEBUG_ERR,("Unknown db_id 0x%x in ctdb_reply_dmaster\n", c->db_id));
599 key.dsize = c->keylen;
600 data.dptr = &c->data[key.dsize];
601 data.dsize = c->datalen;
603 ret = ctdb_ltdb_lock_requeue(ctdb_db, key, hdr,
604 ctdb_call_input_pkt, ctdb, False);
609 DEBUG(DEBUG_ERR,(__location__ " Failed to get lock in ctdb_reply_dmaster\n"));
613 ctdb_become_dmaster(ctdb_db, hdr, key, data, c->rsn);
618 called when a CTDB_REPLY_ERROR packet comes in
620 void ctdb_reply_error(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
622 struct ctdb_reply_error *c = (struct ctdb_reply_error *)hdr;
623 struct ctdb_call_state *state;
625 state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_call_state);
627 DEBUG(DEBUG_ERR,("pnn %u Invalid reqid %u in ctdb_reply_error\n",
628 ctdb->pnn, hdr->reqid));
632 if (hdr->reqid != state->reqid) {
633 /* we found a record but it was the wrong one */
634 DEBUG(DEBUG_ERR, ("Dropped orphaned error reply with reqid:%u\n",hdr->reqid));
638 talloc_steal(state, c);
640 state->state = CTDB_CALL_ERROR;
641 state->errmsg = (char *)c->msg;
642 if (state->async.fn) {
643 state->async.fn(state);
651 static int ctdb_call_destructor(struct ctdb_call_state *state)
653 DLIST_REMOVE(state->ctdb_db->ctdb->pending_calls, state);
654 ctdb_reqid_remove(state->ctdb_db->ctdb, state->reqid);
660 called when a ctdb_call needs to be resent after a reconfigure event
662 static void ctdb_call_resend(struct ctdb_call_state *state)
664 struct ctdb_context *ctdb = state->ctdb_db->ctdb;
666 state->generation = ctdb->vnn_map->generation;
668 /* use a new reqid, in case the old reply does eventually come in */
669 ctdb_reqid_remove(ctdb, state->reqid);
670 state->reqid = ctdb_reqid_new(ctdb, state);
671 state->c->hdr.reqid = state->reqid;
673 /* update the generation count for this request, so its valid with the new vnn_map */
674 state->c->hdr.generation = state->generation;
676 /* send the packet to ourselves, it will be redirected appropriately */
677 state->c->hdr.destnode = ctdb->pnn;
679 ctdb_queue_packet(ctdb, &state->c->hdr);
680 DEBUG(DEBUG_NOTICE,("resent ctdb_call\n"));
684 resend all pending calls on recovery
686 void ctdb_call_resend_all(struct ctdb_context *ctdb)
688 struct ctdb_call_state *state, *next;
689 for (state=ctdb->pending_calls;state;state=next) {
691 ctdb_call_resend(state);
696 this allows the caller to setup a async.fn
698 static void call_local_trigger(struct event_context *ev, struct timed_event *te,
699 struct timeval t, void *private_data)
701 struct ctdb_call_state *state = talloc_get_type(private_data, struct ctdb_call_state);
702 if (state->async.fn) {
703 state->async.fn(state);
709 construct an event driven local ctdb_call
711 this is used so that locally processed ctdb_call requests are processed
712 in an event driven manner
714 struct ctdb_call_state *ctdb_call_local_send(struct ctdb_db_context *ctdb_db,
715 struct ctdb_call *call,
716 struct ctdb_ltdb_header *header,
719 struct ctdb_call_state *state;
720 struct ctdb_context *ctdb = ctdb_db->ctdb;
723 state = talloc_zero(ctdb_db, struct ctdb_call_state);
724 CTDB_NO_MEMORY_NULL(ctdb, state);
726 talloc_steal(state, data->dptr);
728 state->state = CTDB_CALL_DONE;
729 state->call = talloc(state, struct ctdb_call);
730 CTDB_NO_MEMORY_NULL(ctdb, state->call);
731 *(state->call) = *call;
732 state->ctdb_db = ctdb_db;
734 ret = ctdb_call_local(ctdb_db, state->call, header, state, data);
736 event_add_timed(ctdb->ev, state, timeval_zero(), call_local_trigger, state);
743 make a remote ctdb call - async send. Called in daemon context.
745 This constructs a ctdb_call request and queues it for processing.
746 This call never blocks.
748 struct ctdb_call_state *ctdb_daemon_call_send_remote(struct ctdb_db_context *ctdb_db,
749 struct ctdb_call *call,
750 struct ctdb_ltdb_header *header)
753 struct ctdb_call_state *state;
754 struct ctdb_context *ctdb = ctdb_db->ctdb;
756 if (ctdb->methods == NULL) {
757 DEBUG(DEBUG_INFO,(__location__ " Failed send packet. Transport is down\n"));
761 state = talloc_zero(ctdb_db, struct ctdb_call_state);
762 CTDB_NO_MEMORY_NULL(ctdb, state);
763 state->call = talloc(state, struct ctdb_call);
764 CTDB_NO_MEMORY_NULL(ctdb, state->call);
766 state->reqid = ctdb_reqid_new(ctdb, state);
767 state->ctdb_db = ctdb_db;
768 talloc_set_destructor(state, ctdb_call_destructor);
770 len = offsetof(struct ctdb_req_call, data) + call->key.dsize + call->call_data.dsize;
771 state->c = ctdb_transport_allocate(ctdb, state, CTDB_REQ_CALL, len,
772 struct ctdb_req_call);
773 CTDB_NO_MEMORY_NULL(ctdb, state->c);
774 state->c->hdr.destnode = header->dmaster;
776 /* this limits us to 16k outstanding messages - not unreasonable */
777 state->c->hdr.reqid = state->reqid;
778 state->c->flags = call->flags;
779 state->c->db_id = ctdb_db->db_id;
780 state->c->callid = call->call_id;
781 state->c->hopcount = 0;
782 state->c->keylen = call->key.dsize;
783 state->c->calldatalen = call->call_data.dsize;
784 memcpy(&state->c->data[0], call->key.dptr, call->key.dsize);
785 memcpy(&state->c->data[call->key.dsize],
786 call->call_data.dptr, call->call_data.dsize);
787 *(state->call) = *call;
788 state->call->call_data.dptr = &state->c->data[call->key.dsize];
789 state->call->key.dptr = &state->c->data[0];
791 state->state = CTDB_CALL_WAIT;
792 state->generation = ctdb->vnn_map->generation;
794 DLIST_ADD(ctdb->pending_calls, state);
796 ctdb_queue_packet(ctdb, &state->c->hdr);
802 make a remote ctdb call - async recv - called in daemon context
804 This is called when the program wants to wait for a ctdb_call to complete and get the
805 results. This call will block unless the call has already completed.
807 int ctdb_daemon_call_recv(struct ctdb_call_state *state, struct ctdb_call *call)
809 while (state->state < CTDB_CALL_DONE) {
810 event_loop_once(state->ctdb_db->ctdb->ev);
812 if (state->state != CTDB_CALL_DONE) {
813 ctdb_set_error(state->ctdb_db->ctdb, "%s", state->errmsg);
818 if (state->call->reply_data.dsize) {
819 call->reply_data.dptr = talloc_memdup(call,
820 state->call->reply_data.dptr,
821 state->call->reply_data.dsize);
822 call->reply_data.dsize = state->call->reply_data.dsize;
824 call->reply_data.dptr = NULL;
825 call->reply_data.dsize = 0;
827 call->status = state->call->status;
834 send a keepalive packet to the other node
836 void ctdb_send_keepalive(struct ctdb_context *ctdb, uint32_t destnode)
838 struct ctdb_req_keepalive *r;
840 if (ctdb->methods == NULL) {
841 DEBUG(DEBUG_INFO,(__location__ " Failed to send keepalive. Transport is DOWN\n"));
845 r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_KEEPALIVE,
846 sizeof(struct ctdb_req_keepalive),
847 struct ctdb_req_keepalive);
848 CTDB_NO_MEMORY_FATAL(ctdb, r);
849 r->hdr.destnode = destnode;
852 CTDB_INCREMENT_STAT(ctdb, keepalive_packets_sent);
854 ctdb_queue_packet(ctdb, &r->hdr);