2 ctdb_control protocol code to manage server ids
4 Copyright (C) Ronnie Sahlberg 2007
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 #include "include/ctdb_protocol.h"
21 #include "include/ctdb_private.h"
22 #include "common/rb_tree.h"
25 #define SERVER_ID_KEY_SIZE 3
26 static uint32_t *get_server_id_key(struct ctdb_server_id *server_id)
28 static uint32_t key[SERVER_ID_KEY_SIZE];
30 key[0] = server_id->type;
31 key[1] = server_id->pnn;
32 key[2] = server_id->server_id;
37 /* add a server_id to the tree.
38 if we had already 'data' in the tree then this is a duplicate and we can
39 just talloc_free the structure in parm and leave data in the tree.
40 othervise if this is a new node we return parm and that is inserted
43 static void *add_server_id_callback(void *parm, void *data)
54 a serverid that is registered with ctdb will be automatically unregistered
55 once the client domain socket dissappears.
57 int32_t ctdb_control_register_server_id(struct ctdb_context *ctdb,
61 struct ctdb_server_id *server_id;
62 struct ctdb_client *client = ctdb_reqid_find(ctdb, client_id, struct ctdb_client);
66 DEBUG(DEBUG_ERR,(__location__ " Could not find client parent structure. You can not send this control to a remote node\n"));
70 /* hang the server_id structure off client before storing it in the
71 tree so that is will be automatically destroyed when client
73 when the structure is free'd it will be automatically
76 server_id = talloc_zero(client, struct ctdb_server_id);
77 CTDB_NO_MEMORY(ctdb, server_id);
78 memcpy(server_id, indata.dptr, sizeof(struct ctdb_server_id));
80 trbt_insertarray32_callback(ctdb->server_ids, SERVER_ID_KEY_SIZE,
81 get_server_id_key(server_id),
82 add_server_id_callback, server_id);
89 check whether a server id exists
91 int32_t ctdb_control_check_server_id(struct ctdb_context *ctdb,
94 struct ctdb_server_id *server_id = (struct ctdb_server_id *)indata.dptr;
96 return trbt_lookuparray32(ctdb->server_ids,
98 get_server_id_key(server_id)) == NULL? 0 : 1;
102 unregisters a server id
104 int32_t ctdb_control_unregister_server_id(struct ctdb_context *ctdb,
107 struct ctdb_server_id *server_id = (struct ctdb_server_id *)indata.dptr;
109 talloc_free(trbt_lookuparray32(ctdb->server_ids,
111 get_server_id_key(server_id)));
118 struct count_server_ids {
120 struct ctdb_server_id_list *list;
123 static void server_id_count(void *param, void *data)
125 struct count_server_ids *svid = talloc_get_type(param,
126 struct count_server_ids);
129 DEBUG(DEBUG_ERR, (__location__ " Got null pointer for svid\n"));
136 static void server_id_store(void *param, void *data)
138 struct count_server_ids *svid = talloc_get_type(param,
139 struct count_server_ids);
140 struct ctdb_server_id *server_id = talloc_get_type(data,
141 struct ctdb_server_id);
144 DEBUG(DEBUG_ERR, (__location__ " Got null pointer for svid\n"));
148 if (svid->count >= svid->list->num) {
149 DEBUG(DEBUG_ERR, (__location__ " size of server id tree changed during traverse\n"));
153 memcpy(&svid->list->server_ids[svid->count], server_id, sizeof(struct ctdb_server_id));
158 returns a list of all registered server ids for a node
160 int32_t ctdb_control_get_server_id_list(struct ctdb_context *ctdb, TDB_DATA *outdata)
162 struct count_server_ids *svid;
165 svid = talloc_zero(outdata, struct count_server_ids);
166 CTDB_NO_MEMORY(ctdb, svid);
169 /* first we must count how many entries we have */
170 trbt_traversearray32(ctdb->server_ids, SERVER_ID_KEY_SIZE,
171 server_id_count, svid);
174 outdata->dsize = offsetof(struct ctdb_server_id_list,
176 + sizeof(struct ctdb_server_id) * svid->count;
177 outdata->dptr = talloc_size(outdata, outdata->dsize);
178 CTDB_NO_MEMORY(ctdb, outdata->dptr);
181 /* now fill the structure in */
182 svid->list = (struct ctdb_server_id_list *)(outdata->dptr);
183 svid->list->num = svid->count;
185 trbt_traversearray32(ctdb->server_ids, SERVER_ID_KEY_SIZE,
186 server_id_store, svid);