2 Unix SMB/CIFS implementation.
6 Copyright (C) Andrew Tridgell 2006
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include "lib/events/events.h"
25 #include "cluster/cluster.h"
26 #include "system/filesys.h"
27 #include "cluster/cluster_private.h"
28 #include "lib/tdb/include/tdb.h"
29 #include "include/ctdb.h"
31 #include "lib/util/dlinklist.h"
33 /* a linked list of messaging handlers, allowing incoming messages
34 to be directed to the right messaging context */
35 struct cluster_messaging_list {
36 struct cluster_messaging_list *next, *prev;
37 struct cluster_state *state;
38 struct messaging_context *msg;
39 struct server_id server;
40 cluster_message_fn_t handler;
43 struct cluster_state {
44 struct ctdb_context *ctdb;
45 struct cluster_messaging_list *list;
51 return a server_id for a ctdb node
53 static struct server_id ctdb_id(struct cluster_ops *ops, uint32_t id)
55 struct cluster_state *state = ops->private;
56 struct ctdb_context *ctdb = state->ctdb;
57 struct server_id server_id;
58 server_id.node = ctdb_get_vnn(ctdb);
65 return a server_id as a string
67 static const char *ctdb_id_string(struct cluster_ops *ops,
68 TALLOC_CTX *mem_ctx, struct server_id id)
70 return talloc_asprintf(mem_ctx, "%u.%u", id.node, id.id);
74 this is an interim method for subsystems that have not yet been
75 converted to use the ctdb api. It opens a shared database in the
76 cluster temporary area, using TDB_CLEAR_IF_FIRST which relies on
77 correct operation of fcntl locks on the shared fileystem.
79 static struct tdb_wrap *ctdb_tdb_tmp_open(struct cluster_ops *ops,
80 TALLOC_CTX *mem_ctx, const char *dbname,
83 const char *dir = lp_parm_string(-1, "ctdb", "shared data");
87 DEBUG(0,("ERROR: You must set 'ctdb:shared data' to a cluster shared path\n"));
90 path = talloc_asprintf(mem_ctx, "%s/%s", dir, dbname);
91 w = tdb_wrap_open(mem_ctx, path, 0,
92 flags | TDB_CLEAR_IF_FIRST,
93 O_RDWR|O_CREAT, 0600);
99 get at the ctdb handle
101 static void *ctdb_backend_handle(struct cluster_ops *ops)
103 struct cluster_state *state = ops->private;
104 return (void *)state->ctdb;
107 struct ctdb_handler_state {
108 struct cluster_state *state;
109 cluster_message_fn_t handler;
110 struct messaging_context *msg;
114 dispatch incoming ctdb messages
116 static void ctdb_message_handler(struct ctdb_context *ctdb, uint32_t srvid,
117 TDB_DATA data, void *private)
119 struct ctdb_handler_state *s = talloc_get_type(private,
120 struct ctdb_handler_state);
122 blob.data = data.dptr;
123 blob.length = data.dsize;
124 s->handler(s->msg, blob);
127 static int ctdb_handler_destructor(struct ctdb_handler_state *s)
129 /* XXX - tell ctdb to de-register the message handler */
134 setup a handler for ctdb messages
136 static NTSTATUS ctdb_message_init(struct cluster_ops *ops,
137 struct messaging_context *msg,
138 struct server_id server,
139 cluster_message_fn_t handler)
141 struct cluster_state *state = ops->private;
142 struct ctdb_handler_state *h;
145 h = talloc(msg, struct ctdb_handler_state);
146 NT_STATUS_HAVE_NO_MEMORY(h);
149 h->handler = handler;
152 talloc_set_destructor(h, ctdb_handler_destructor);
154 /* setup a message handler */
155 ret = ctdb_set_message_handler(state->ctdb, server.id,
156 ctdb_message_handler, h);
158 DEBUG(0,("ctdb_set_message_handler failed - %s\n",
159 ctdb_errstr(state->ctdb)));
167 send a ctdb message to another node
169 static NTSTATUS ctdb_message_send(struct cluster_ops *ops,
170 struct server_id server, DATA_BLOB *data)
172 struct cluster_state *state = ops->private;
173 struct ctdb_context *ctdb = state->ctdb;
177 tdata.dptr = data->data;
178 tdata.dsize = data->length;
180 ret = ctdb_send_message(ctdb, server.node, server.id, tdata);
182 return NT_STATUS_INTERNAL_DB_CORRUPTION;
187 static struct cluster_ops cluster_ctdb_ops = {
188 .cluster_id = ctdb_id,
189 .cluster_id_string = ctdb_id_string,
190 .cluster_tdb_tmp_open = ctdb_tdb_tmp_open,
191 .backend_handle = ctdb_backend_handle,
192 .message_init = ctdb_message_init,
193 .message_send = ctdb_message_send,
197 /* initialise ctdb */
198 void cluster_ctdb_init(struct event_context *ev, const char *model)
202 const char *transport;
203 struct cluster_state *state;
205 const char *db_list[] = { "brlock", "opendb" };
207 nlist = lp_parm_string(-1, "ctdb", "nlist");
208 if (nlist == NULL) return;
210 address = lp_parm_string(-1, "ctdb", "address");
211 if (address == NULL) return;
213 transport = lp_parm_string(-1, "ctdb", "transport");
214 if (transport == NULL) {
218 state = talloc(ev, struct cluster_state);
219 if (state == NULL) goto failed;
221 state->ctdb = ctdb_init(ev);
222 if (state->ctdb == NULL) goto failed;
226 cluster_ctdb_ops.private = state;
228 ret = ctdb_set_transport(state->ctdb, transport);
230 DEBUG(0,("ctdb_set_transport failed - %s\n",
231 ctdb_errstr(state->ctdb)));
235 if (lp_parm_bool(-1, "ctdb", "selfconnect", False)) {
236 DEBUG(0,("Enabling ctdb selfconnect\n"));
237 ctdb_set_flags(state->ctdb, CTDB_FLAG_SELF_CONNECT);
240 lacount = lp_parm_int(-1, "ctdb", "maxlacount", -1);
242 ctdb_set_max_lacount(state->ctdb, lacount);
245 /* tell ctdb what address to listen on */
246 ret = ctdb_set_address(state->ctdb, address);
248 DEBUG(0,("ctdb_set_address failed - %s\n", ctdb_errstr(state->ctdb)));
252 ret = ctdb_set_tdb_dir(state->ctdb, lp_lockdir());
254 DEBUG(0,("ctdb_set_tdb_dir failed - %s\n", ctdb_errstr(state->ctdb)));
258 /* tell ctdb what nodes are available */
259 ret = ctdb_set_nlist(state->ctdb, nlist);
261 DEBUG(0,("ctdb_set_nlist failed - %s\n", ctdb_errstr(state->ctdb)));
265 /* attach all the databases we will need */
266 for (i=0;i<ARRAY_SIZE(db_list);i++) {
267 struct ctdb_db_context *ctdb_db;
268 ctdb_db = ctdb_attach(state->ctdb, db_list[i], TDB_INTERNAL,
269 O_RDWR|O_CREAT|O_TRUNC, 0666);
270 if (ctdb_db == NULL) goto failed;
273 cluster_set_ops(&cluster_ctdb_ops);
275 /* nasty hack for now ... */
277 void brl_ctdb_init_ops(void);
281 /* start the protocol running */
282 ret = ctdb_start(state->ctdb);
284 DEBUG(0,("ctdb_start failed - %s\n", ctdb_errstr(state->ctdb)));
288 /* wait until all nodes are connected (should not be needed
289 outside of test code) */
290 ctdb_connect_wait(state->ctdb);
295 DEBUG(0,("cluster_ctdb_init failed\n"));