mirror of
https://github.com/samba-team/samba.git
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353a82f87c
(This used to be ctdb commit 4cbaf22cc4bede8c95dd9b87e21bbe886307e23b)
193 lines
5.0 KiB
C
193 lines
5.0 KiB
C
/*
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ctdb_message protocol code
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Copyright (C) Andrew Tridgell 2007
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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see http://wiki.samba.org/index.php/Samba_%26_Clustering for
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protocol design and packet details
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*/
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#include "includes.h"
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#include "lib/events/events.h"
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#include "lib/tdb/include/tdb.h"
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#include "system/network.h"
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#include "system/filesys.h"
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#include "../include/ctdb_private.h"
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#include "lib/util/dlinklist.h"
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/*
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this dispatches the messages to the registered ctdb message handler
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*/
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static int ctdb_dispatch_message(struct ctdb_context *ctdb, uint64_t srvid, TDB_DATA data)
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{
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struct ctdb_message_list *ml;
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for (ml=ctdb->message_list;ml;ml=ml->next) {
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if (ml->srvid == srvid || ml->srvid == CTDB_SRVID_ALL) {
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ml->message_handler(ctdb, srvid, data, ml->message_private);
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}
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}
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return 0;
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}
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/*
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called when a CTDB_REQ_MESSAGE packet comes in
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*/
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void ctdb_request_message(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
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{
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struct ctdb_req_message *c = (struct ctdb_req_message *)hdr;
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TDB_DATA data;
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data.dptr = &c->data[0];
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data.dsize = c->datalen;
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ctdb_dispatch_message(ctdb, c->srvid, data);
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}
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/*
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this local messaging handler is ugly, but is needed to prevent
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recursion in ctdb_send_message() when the destination node is the
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same as the source node
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*/
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struct ctdb_local_message {
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struct ctdb_context *ctdb;
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uint64_t srvid;
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TDB_DATA data;
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};
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static void ctdb_local_message_trigger(struct event_context *ev, struct timed_event *te,
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struct timeval t, void *private_data)
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{
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struct ctdb_local_message *m = talloc_get_type(private_data,
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struct ctdb_local_message);
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int res;
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res = ctdb_dispatch_message(m->ctdb, m->srvid, m->data);
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if (res != 0) {
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DEBUG(0, (__location__ " Failed to dispatch message for srvid=%llu\n", m->srvid));
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}
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talloc_free(m);
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}
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static int ctdb_local_message(struct ctdb_context *ctdb, uint64_t srvid, TDB_DATA data)
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{
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struct ctdb_local_message *m;
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m = talloc(ctdb, struct ctdb_local_message);
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CTDB_NO_MEMORY(ctdb, m);
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m->ctdb = ctdb;
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m->srvid = srvid;
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m->data = data;
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m->data.dptr = talloc_memdup(m, m->data.dptr, m->data.dsize);
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if (m->data.dptr == NULL) {
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talloc_free(m);
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return -1;
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}
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/* this needs to be done as an event to prevent recursion */
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event_add_timed(ctdb->ev, m, timeval_zero(), ctdb_local_message_trigger, m);
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return 0;
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}
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/*
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send a ctdb message
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*/
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int ctdb_daemon_send_message(struct ctdb_context *ctdb, uint32_t vnn,
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uint64_t srvid, TDB_DATA data)
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{
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struct ctdb_req_message *r;
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int len;
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/* see if this is a message to ourselves */
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if (vnn == ctdb->vnn && !(ctdb->flags & CTDB_FLAG_SELF_CONNECT)) {
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return ctdb_local_message(ctdb, srvid, data);
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}
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len = offsetof(struct ctdb_req_message, data) + data.dsize;
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r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_MESSAGE, len,
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struct ctdb_req_message);
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CTDB_NO_MEMORY(ctdb, r);
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r->hdr.destnode = vnn;
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r->srvid = srvid;
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r->datalen = data.dsize;
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memcpy(&r->data[0], data.dptr, data.dsize);
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if (vnn != CTDB_BROADCAST_VNN) {
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ctdb_queue_packet(ctdb, &r->hdr);
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} else {
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struct ctdb_node *node;
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int i;
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/* this was a broadcast message
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loop over all other nodes and send them each a copy
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*/
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for (i=0; i<ctdb_get_num_nodes(ctdb); i++) {
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node=ctdb->nodes[i];
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/* we do not send the message to ourself */
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if (node && node->vnn!=ctdb->vnn) {
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r->hdr.destnode = node->vnn;
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ctdb_queue_packet(ctdb, &r->hdr);
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}
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}
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/* also make sure to dispatch the message locally */
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ctdb_dispatch_message(ctdb, srvid, data);
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}
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talloc_free(r);
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return 0;
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}
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/*
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when a client goes away, we need to remove its srvid handler from the list
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*/
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static int message_handler_destructor(struct ctdb_message_list *m)
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{
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DLIST_REMOVE(m->ctdb->message_list, m);
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return 0;
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}
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/*
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setup handler for receipt of ctdb messages from ctdb_send_message()
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*/
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int ctdb_register_message_handler(struct ctdb_context *ctdb,
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TALLOC_CTX *mem_ctx,
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uint64_t srvid,
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ctdb_message_fn_t handler,
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void *private_data)
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{
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struct ctdb_message_list *m;
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m = talloc(mem_ctx, struct ctdb_message_list);
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CTDB_NO_MEMORY(ctdb, m);
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m->ctdb = ctdb;
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m->srvid = srvid;
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m->message_handler = handler;
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m->message_private = private_data;
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DLIST_ADD(ctdb->message_list, m);
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talloc_set_destructor(m, message_handler_destructor);
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return 0;
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}
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