2 ctdb main protocol code
4 Copyright (C) Andrew Tridgell 2006
6 This library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
11 This library 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 GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with this library; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include "lib/tdb/include/tdb.h"
23 #include "lib/events/events.h"
24 #include "lib/util/dlinklist.h"
25 #include "system/network.h"
26 #include "system/filesys.h"
27 #include "../include/ctdb_private.h"
30 choose the transport we will use
32 int ctdb_set_transport(struct ctdb_context *ctdb, const char *transport)
34 ctdb->transport = talloc_strdup(ctdb, transport);
42 void ctdb_set_flags(struct ctdb_context *ctdb, unsigned flags)
50 void ctdb_clear_flags(struct ctdb_context *ctdb, unsigned flags)
52 ctdb->flags &= ~flags;
56 set max acess count before a dmaster migration
58 void ctdb_set_max_lacount(struct ctdb_context *ctdb, unsigned count)
60 ctdb->max_lacount = count;
64 set the directory for the local databases
66 int ctdb_set_tdb_dir(struct ctdb_context *ctdb, const char *dir)
69 ctdb->db_directory = talloc_asprintf(ctdb, "ctdb-%u", ctdb_get_vnn(ctdb));
71 ctdb->db_directory = talloc_strdup(ctdb, dir);
73 if (ctdb->db_directory == NULL) {
80 add a node to the list of active nodes
82 static int ctdb_add_node(struct ctdb_context *ctdb, char *nstr)
84 struct ctdb_node *node, **nodep;
86 nodep = talloc_realloc(ctdb, ctdb->nodes, struct ctdb_node *, ctdb->num_nodes+1);
87 CTDB_NO_MEMORY(ctdb, nodep);
90 nodep = &ctdb->nodes[ctdb->num_nodes];
91 (*nodep) = talloc_zero(ctdb->nodes, struct ctdb_node);
92 CTDB_NO_MEMORY(ctdb, *nodep);
95 if (ctdb_parse_address(ctdb, node, nstr, &node->address) != 0) {
99 node->name = talloc_asprintf(node, "%s:%u",
100 node->address.address,
102 /* for now we just set the vnn to the line in the file - this
104 node->vnn = ctdb->num_nodes;
106 if (ctdb_same_address(&ctdb->address, &node->address)) {
107 ctdb->vnn = node->vnn;
116 setup the node list from a file
118 int ctdb_set_nlist(struct ctdb_context *ctdb, const char *nlist)
124 lines = file_lines_load(nlist, &nlines, ctdb);
126 ctdb_set_error(ctdb, "Failed to load nlist '%s'\n", nlist);
130 for (i=0;i<nlines;i++) {
131 if (ctdb_add_node(ctdb, lines[i]) != 0) {
142 setup the local node address
144 int ctdb_set_address(struct ctdb_context *ctdb, const char *address)
146 if (ctdb_parse_address(ctdb, ctdb, address, &ctdb->address) != 0) {
150 ctdb->name = talloc_asprintf(ctdb, "%s:%u",
151 ctdb->address.address,
158 setup the local socket name
160 int ctdb_set_socketname(struct ctdb_context *ctdb, const char *socketname)
162 ctdb->daemon.name = talloc_strdup(ctdb, socketname);
167 add a node to the list of active nodes
169 int ctdb_set_call(struct ctdb_db_context *ctdb_db, ctdb_fn_t fn, int id)
171 struct ctdb_registered_call *call;
173 call = talloc(ctdb_db, struct ctdb_registered_call);
177 DLIST_ADD(ctdb_db->calls, call);
182 return the vnn of this node
184 uint32_t ctdb_get_vnn(struct ctdb_context *ctdb)
190 return the number of nodes
192 uint32_t ctdb_get_num_nodes(struct ctdb_context *ctdb)
194 return ctdb->num_nodes;
199 called by the transport layer when a packet comes in
201 void ctdb_recv_pkt(struct ctdb_context *ctdb, uint8_t *data, uint32_t length)
203 struct ctdb_req_header *hdr = (struct ctdb_req_header *)data;
206 ctdb->status.node_packets_recv++;
208 /* place the packet as a child of the tmp_ctx. We then use
209 talloc_free() below to free it. If any of the calls want
210 to keep it, then they will steal it somewhere else, and the
211 talloc_free() will only free the tmp_ctx */
212 tmp_ctx = talloc_new(ctdb);
213 talloc_steal(tmp_ctx, hdr);
215 if (length < sizeof(*hdr)) {
216 ctdb_set_error(ctdb, "Bad packet length %d\n", length);
219 if (length != hdr->length) {
220 ctdb_set_error(ctdb, "Bad header length %d expected %d\n",
221 hdr->length, length);
225 if (hdr->ctdb_magic != CTDB_MAGIC) {
226 ctdb_set_error(ctdb, "Non CTDB packet rejected\n");
230 if (hdr->ctdb_version != CTDB_VERSION) {
231 ctdb_set_error(ctdb, "Bad CTDB version 0x%x rejected\n", hdr->ctdb_version);
235 DEBUG(3,(__location__ " ctdb request %d of type %d length %d from "
236 "node %d to %d\n", hdr->reqid, hdr->operation, hdr->length,
237 hdr->srcnode, hdr->destnode));
239 switch (hdr->operation) {
241 ctdb->status.count.req_call++;
242 ctdb_request_call(ctdb, hdr);
245 case CTDB_REPLY_CALL:
246 ctdb->status.count.reply_call++;
247 ctdb_reply_call(ctdb, hdr);
250 case CTDB_REPLY_ERROR:
251 ctdb->status.count.reply_error++;
252 ctdb_reply_error(ctdb, hdr);
255 case CTDB_REPLY_REDIRECT:
256 ctdb->status.count.reply_redirect++;
257 ctdb_reply_redirect(ctdb, hdr);
260 case CTDB_REQ_DMASTER:
261 ctdb->status.count.req_dmaster++;
262 ctdb_request_dmaster(ctdb, hdr);
265 case CTDB_REPLY_DMASTER:
266 ctdb->status.count.reply_dmaster++;
267 ctdb_reply_dmaster(ctdb, hdr);
270 case CTDB_REQ_MESSAGE:
271 ctdb->status.count.req_message++;
272 ctdb_request_message(ctdb, hdr);
275 case CTDB_REQ_FINISHED:
276 ctdb->status.count.req_finished++;
277 ctdb_request_finished(ctdb, hdr);
280 case CTDB_REQ_CONTROL:
281 ctdb->status.count.req_control++;
282 ctdb_request_control(ctdb, hdr);
285 case CTDB_REPLY_CONTROL:
286 ctdb->status.count.reply_control++;
287 ctdb_reply_control(ctdb, hdr);
291 DEBUG(0,("%s: Packet with unknown operation %d\n",
292 __location__, hdr->operation));
297 talloc_free(tmp_ctx);
301 called by the transport layer when a packet comes in
303 void ctdb_recv_raw_pkt(void *p, uint8_t *data, uint32_t length)
305 struct ctdb_context *ctdb = talloc_get_type(p, struct ctdb_context);
306 ctdb_recv_pkt(ctdb, data, length);
310 called by the transport layer when a node is dead
312 static void ctdb_node_dead(struct ctdb_node *node)
314 node->ctdb->num_connected--;
315 DEBUG(1,("%s: node %s is dead: %d connected\n",
316 node->ctdb->name, node->name, node->ctdb->num_connected));
320 called by the transport layer when a node is connected
322 static void ctdb_node_connected(struct ctdb_node *node)
324 node->ctdb->num_connected++;
325 DEBUG(1,("%s: connected to %s - %d connected\n",
326 node->ctdb->name, node->name, node->ctdb->num_connected));
330 wait for all nodes to be connected
332 void ctdb_daemon_connect_wait(struct ctdb_context *ctdb)
334 int expected = ctdb->num_nodes - 1;
335 if (ctdb->flags & CTDB_FLAG_SELF_CONNECT) {
338 while (ctdb->num_connected != expected) {
339 DEBUG(3,("ctdb_connect_wait: waiting for %d nodes (have %d)\n",
340 expected, ctdb->num_connected));
341 event_loop_once(ctdb->ev);
343 DEBUG(3,("ctdb_connect_wait: got all %d nodes\n", expected));
347 struct ctdb_context *ctdb;
348 struct ctdb_req_header *hdr;
353 trigered when a deferred packet is due
355 static void queue_next_trigger(struct event_context *ev, struct timed_event *te,
356 struct timeval t, void *private_data)
358 struct queue_next *q = talloc_get_type(private_data, struct queue_next);
359 ctdb_recv_pkt(q->ctdb, (uint8_t *)q->hdr, q->hdr->length);
364 defer a packet, so it is processed on the next event loop
365 this is used for sending packets to ourselves
367 static void ctdb_defer_packet(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
369 struct queue_next *q;
370 q = talloc(ctdb, struct queue_next);
372 DEBUG(0,(__location__ " Failed to allocate deferred packet\n"));
376 q->hdr = talloc_memdup(ctdb, hdr, hdr->length);
377 if (q->hdr == NULL) {
378 DEBUG(0,("Error copying deferred packet to self\n"));
382 /* use this to put packets directly into our recv function */
383 ctdb_recv_pkt(q->ctdb, (uint8_t *)q->hdr, q->hdr->length);
386 event_add_timed(ctdb->ev, q, timeval_zero(), queue_next_trigger, q);
391 queue a packet or die
393 void ctdb_queue_packet(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
395 struct ctdb_node *node;
396 ctdb->status.node_packets_sent++;
398 if (!ctdb_validate_vnn(ctdb, hdr->destnode)) {
399 DEBUG(0,(__location__ " cant send to node %u that does not exist\n",
404 node = ctdb->nodes[hdr->destnode];
406 if (hdr->destnode == ctdb->vnn && !(ctdb->flags & CTDB_FLAG_SELF_CONNECT)) {
407 ctdb_defer_packet(ctdb, hdr);
408 } else if (ctdb->methods->queue_pkt(node, (uint8_t *)hdr, hdr->length) != 0) {
409 ctdb_fatal(ctdb, "Unable to queue packet\n");
414 static const struct ctdb_upcalls ctdb_upcalls = {
415 .recv_pkt = ctdb_recv_pkt,
416 .node_dead = ctdb_node_dead,
417 .node_connected = ctdb_node_connected
421 initialise the ctdb daemon.
423 NOTE: In current code the daemon does not fork. This is for testing purposes only
424 and to simplify the code.
426 struct ctdb_context *ctdb_init(struct event_context *ev)
428 struct ctdb_context *ctdb;
430 ctdb = talloc_zero(ev, struct ctdb_context);
432 ctdb->upcalls = &ctdb_upcalls;
433 ctdb->idr = idr_init(ctdb);
434 ctdb->max_lacount = CTDB_DEFAULT_MAX_LACOUNT;