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https://github.com/samba-team/samba.git
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9f7d98380b
(This used to be ctdb commit 9c4e5569b82d9c7894e3ac1d5f0783c4d770daf4)
632 lines
16 KiB
C
632 lines
16 KiB
C
/*
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ctdb daemon code
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Copyright (C) Andrew Tridgell 2006
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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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#include "includes.h"
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#include "db_wrap.h"
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#include "lib/tdb/include/tdb.h"
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#include "lib/events/events.h"
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#include "lib/util/dlinklist.h"
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#include "system/network.h"
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#include "system/filesys.h"
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#include "../include/ctdb.h"
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#include "../include/ctdb_private.h"
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static void ctdb_main_loop(struct ctdb_context *ctdb)
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{
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ctdb->methods->start(ctdb);
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/* go into a wait loop to allow other nodes to complete */
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event_loop_wait(ctdb->ev);
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printf("event_loop_wait() returned. this should not happen\n");
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exit(1);
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}
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static void set_non_blocking(int fd)
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{
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unsigned v;
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v = fcntl(fd, F_GETFL, 0);
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fcntl(fd, F_SETFL, v | O_NONBLOCK);
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}
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/*
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structure describing a connected client in the daemon
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*/
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struct ctdb_client {
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struct ctdb_context *ctdb;
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int fd;
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struct ctdb_queue *queue;
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};
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/*
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message handler for when we are in daemon mode. This redirects the message
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to the right client
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*/
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static void daemon_message_handler(struct ctdb_context *ctdb, uint32_t srvid,
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TDB_DATA data, void *private_data)
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{
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struct ctdb_client *client = talloc_get_type(private_data, struct ctdb_client);
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struct ctdb_req_message *r;
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int len;
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/* construct a message to send to the client containing the data */
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len = offsetof(struct ctdb_req_message, data) + data.dsize;
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r = ctdbd_allocate_pkt(ctdb, len);
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/*XXX cant use this since it returns an int CTDB_NO_MEMORY(ctdb, r);*/
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talloc_set_name_const(r, "req_message packet");
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ZERO_STRUCT(*r);
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r->hdr.length = len;
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r->hdr.ctdb_magic = CTDB_MAGIC;
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r->hdr.ctdb_version = CTDB_VERSION;
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r->hdr.operation = CTDB_REQ_MESSAGE;
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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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ctdb_queue_send(client->queue, (uint8_t *)&r->hdr, len);
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talloc_free(r);
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return;
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}
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/*
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this is called when the ctdb daemon received a ctdb request to
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set the srvid from the client
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*/
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static void daemon_request_register_message_handler(struct ctdb_client *client,
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struct ctdb_req_register *c)
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{
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int res;
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res = ctdb_register_message_handler(client->ctdb, client,
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c->srvid, daemon_message_handler,
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client);
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if (res != 0) {
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printf("Failed to register handler %u in daemon\n", c->srvid);
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}
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}
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static struct ctdb_call_state *ctdb_fetch_lock_send(struct ctdb_db_context *ctdb_db,
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TALLOC_CTX *mem_ctx,
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TDB_DATA key, TDB_DATA *data)
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{
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struct ctdb_call *call;
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struct ctdb_record_handle *rec;
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struct ctdb_call_state *state;
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rec = talloc(mem_ctx, struct ctdb_record_handle);
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CTDB_NO_MEMORY_NULL(ctdb_db->ctdb, rec);
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call = talloc(rec, struct ctdb_call);
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ZERO_STRUCT(*call);
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call->call_id = CTDB_FETCH_FUNC;
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call->key = key;
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call->flags = CTDB_IMMEDIATE_MIGRATION;
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rec->ctdb_db = ctdb_db;
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rec->key = key;
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rec->key.dptr = talloc_memdup(rec, key.dptr, key.dsize);
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rec->data = data;
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state = ctdb_call_send(ctdb_db, call);
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state->fetch_private = rec;
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return state;
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}
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struct client_fetch_lock_data {
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struct ctdb_client *client;
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uint32_t reqid;
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};
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static void daemon_fetch_lock_complete(struct ctdb_call_state *state)
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{
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struct ctdb_reply_fetch_lock *r;
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struct client_fetch_lock_data *data = talloc_get_type(state->async.private_data, struct client_fetch_lock_data);
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struct ctdb_client *client = talloc_get_type(data->client, struct ctdb_client);
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int length, res;
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length = offsetof(struct ctdb_reply_fetch_lock, data) + state->call.reply_data.dsize;
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r = ctdbd_allocate_pkt(client->ctdb, length);
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if (r == NULL) {
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printf("Failed to allocate reply_call in ctdb daemon\n");
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return;
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}
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ZERO_STRUCT(*r);
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r->hdr.length = length;
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r->hdr.ctdb_magic = CTDB_MAGIC;
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r->hdr.ctdb_version = CTDB_VERSION;
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r->hdr.operation = CTDB_REPLY_FETCH_LOCK;
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r->hdr.reqid = data->reqid;
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r->state = state->state;
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r->datalen = state->call.reply_data.dsize;
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memcpy(&r->data[0], state->call.reply_data.dptr, r->datalen);
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res = ctdb_queue_send(client->queue, (uint8_t *)&r->hdr, r->hdr.length);
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if (res != 0) {
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printf("Failed to queue packet from daemon to client\n");
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}
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talloc_free(r);
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}
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/*
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called when the daemon gets a fetch lock request from a client
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*/
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static void daemon_request_fetch_lock(struct ctdb_client *client,
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struct ctdb_req_fetch_lock *f)
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{
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struct ctdb_call_state *state;
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TDB_DATA key, *data;
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struct ctdb_db_context *ctdb_db;
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struct client_fetch_lock_data *fl_data;
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ctdb_db = find_ctdb_db(client->ctdb, f->db_id);
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key.dsize = f->keylen;
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key.dptr = &f->key[0];
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data = talloc(client, TDB_DATA);
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data->dptr = NULL;
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data->dsize = 0;
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state = ctdb_fetch_lock_send(ctdb_db, client, key, data);
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talloc_steal(state, data);
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fl_data = talloc(state, struct client_fetch_lock_data);
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fl_data->client = client;
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fl_data->reqid = f->hdr.reqid;
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state->async.fn = daemon_fetch_lock_complete;
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state->async.private_data = fl_data;
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}
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/*
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called when the daemon gets a store unlock request from a client
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this would never block?
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*/
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static void daemon_request_store_unlock(struct ctdb_client *client,
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struct ctdb_req_store_unlock *f)
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{
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struct ctdb_db_context *ctdb_db;
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struct ctdb_reply_store_unlock r;
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uint32_t caller = ctdb_get_vnn(client->ctdb);
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struct ctdb_ltdb_header header;
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TDB_DATA key, data;
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int res;
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ctdb_db = find_ctdb_db(client->ctdb, f->db_id);
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/* write the data to ltdb */
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key.dsize = f->keylen;
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key.dptr = &f->data[0];
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res = ctdb_ltdb_fetch(ctdb_db, key, &header, NULL, NULL);
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if (res) {
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ctdb_set_error(ctdb_db->ctdb, "Fetch of locally held record failed");
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res = -1;
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goto done;
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}
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if (header.laccessor != caller) {
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header.lacount = 0;
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}
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header.laccessor = caller;
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header.lacount++;
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data.dsize = f->datalen;
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data.dptr = &f->data[f->keylen];
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res = ctdb_ltdb_store(ctdb_db, key, &header, data);
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if ( res != 0) {
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ctdb_set_error(ctdb_db->ctdb, "ctdb_call tdb_store failed\n");
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}
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done:
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/* now send the reply */
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ZERO_STRUCT(r);
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r.hdr.length = sizeof(r);
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r.hdr.ctdb_magic = CTDB_MAGIC;
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r.hdr.ctdb_version = CTDB_VERSION;
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r.hdr.operation = CTDB_REPLY_STORE_UNLOCK;
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r.hdr.reqid = f->hdr.reqid;
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r.state = res;
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res = ctdb_queue_send(client->queue, (uint8_t *)&r.hdr, r.hdr.length);
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if (res != 0) {
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printf("Failed to queue a store unlock response\n");
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return;
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}
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}
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/*
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called when the daemon gets a connect wait request from a client
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*/
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static void daemon_request_connect_wait(struct ctdb_client *client,
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struct ctdb_req_connect_wait *c)
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{
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struct ctdb_reply_connect_wait r;
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int res;
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/* first wait - in the daemon */
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ctdb_daemon_connect_wait(client->ctdb);
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/* now send the reply */
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ZERO_STRUCT(r);
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r.hdr.length = sizeof(r);
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r.hdr.ctdb_magic = CTDB_MAGIC;
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r.hdr.ctdb_version = CTDB_VERSION;
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r.hdr.operation = CTDB_REPLY_CONNECT_WAIT;
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r.vnn = ctdb_get_vnn(client->ctdb);
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r.num_connected = client->ctdb->num_connected;
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res = ctdb_queue_send(client->queue, (uint8_t *)&r.hdr, r.hdr.length);
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if (res != 0) {
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printf("Failed to queue a connect wait response\n");
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return;
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}
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}
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/*
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destroy a ctdb_client
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*/
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static int ctdb_client_destructor(struct ctdb_client *client)
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{
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close(client->fd);
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client->fd = -1;
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return 0;
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}
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/*
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this is called when the ctdb daemon received a ctdb request message
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from a local client over the unix domain socket
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*/
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static void daemon_request_message_from_client(struct ctdb_client *client,
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struct ctdb_req_message *c)
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{
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TDB_DATA data;
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int res;
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/* maybe the message is for another client on this node */
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if (ctdb_get_vnn(client->ctdb)==c->hdr.destnode) {
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ctdb_request_message(client->ctdb, (struct ctdb_req_header *)c);
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return;
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}
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/* its for a remote node */
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data.dptr = &c->data[0];
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data.dsize = c->datalen;
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res = ctdb_daemon_send_message(client->ctdb, c->hdr.destnode,
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c->srvid, data);
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if (res != 0) {
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printf("Failed to send message to remote node %u\n",
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c->hdr.destnode);
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}
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}
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/*
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this is called when the ctdb daemon received a ctdb request call
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from a local client over the unix domain socket
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*/
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static void daemon_request_call_from_client(struct ctdb_client *client,
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struct ctdb_req_call *c)
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{
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struct ctdb_call_state *state;
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struct ctdb_db_context *ctdb_db;
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struct ctdb_call call;
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struct ctdb_reply_call *r;
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int res;
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uint32_t length;
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ctdb_db = find_ctdb_db(client->ctdb, c->db_id);
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if (!ctdb_db) {
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printf("Unknown database in request. db_id==0x%08x",c->db_id);
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return;
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}
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ZERO_STRUCT(call);
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call.call_id = c->callid;
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call.key.dptr = c->data;
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call.key.dsize = c->keylen;
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call.call_data.dptr = c->data + c->keylen;
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call.call_data.dsize = c->calldatalen;
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state = ctdb_call_send(ctdb_db, &call);
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/* XXX this must be converted to fully async */
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res = ctdb_call_recv(state, &call);
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if (res != 0) {
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printf("ctdbd_call_recv() returned error\n");
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exit(1);
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}
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length = offsetof(struct ctdb_reply_call, data) + call.reply_data.dsize;
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r = ctdbd_allocate_pkt(client->ctdb, length);
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if (r == NULL) {
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printf("Failed to allocate reply_call in ctdb daemon\n");
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return;
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}
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ZERO_STRUCT(*r);
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r->hdr.length = length;
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r->hdr.ctdb_magic = CTDB_MAGIC;
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r->hdr.ctdb_version = CTDB_VERSION;
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r->hdr.operation = CTDB_REPLY_CALL;
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r->hdr.reqid = c->hdr.reqid;
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r->datalen = call.reply_data.dsize;
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memcpy(&r->data[0], call.reply_data.dptr, r->datalen);
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res = ctdb_queue_send(client->queue, (uint8_t *)&r, r->hdr.length);
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if (res != 0) {
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printf("Failed to queue packet from daemon to client\n");
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}
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talloc_free(r);
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}
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/* data contains a packet from the client */
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static void client_incoming_packet(struct ctdb_client *client, void *data, size_t nread)
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{
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struct ctdb_req_header *hdr = data;
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if (hdr->ctdb_magic != CTDB_MAGIC) {
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ctdb_set_error(client->ctdb, "Non CTDB packet rejected\n");
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goto done;
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}
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if (hdr->ctdb_version != CTDB_VERSION) {
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ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected\n", hdr->ctdb_version);
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goto done;
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}
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switch (hdr->operation) {
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case CTDB_REQ_CALL:
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daemon_request_call_from_client(client, (struct ctdb_req_call *)hdr);
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break;
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case CTDB_REQ_REGISTER:
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daemon_request_register_message_handler(client,
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(struct ctdb_req_register *)hdr);
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break;
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case CTDB_REQ_MESSAGE:
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daemon_request_message_from_client(client, (struct ctdb_req_message *)hdr);
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break;
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case CTDB_REQ_CONNECT_WAIT:
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daemon_request_connect_wait(client, (struct ctdb_req_connect_wait *)hdr);
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break;
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case CTDB_REQ_FETCH_LOCK:
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daemon_request_fetch_lock(client, (struct ctdb_req_fetch_lock *)hdr);
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break;
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case CTDB_REQ_STORE_UNLOCK:
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daemon_request_store_unlock(client, (struct ctdb_req_store_unlock *)hdr);
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break;
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default:
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printf("daemon: unrecognized operation:%d\n",hdr->operation);
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}
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done:
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talloc_free(data);
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}
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static void ctdb_client_read_cb(uint8_t *data, size_t cnt, void *args)
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{
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struct ctdb_client *client = talloc_get_type(args, struct ctdb_client);
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struct ctdb_req_header *hdr;
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if (cnt == 0) {
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talloc_free(client);
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return;
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}
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if (cnt < sizeof(*hdr)) {
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ctdb_set_error(client->ctdb, "Bad packet length %d\n", cnt);
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return;
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}
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hdr = (struct ctdb_req_header *)data;
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if (cnt != hdr->length) {
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ctdb_set_error(client->ctdb, "Bad header length %d expected %d\n",
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hdr->length, cnt);
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return;
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}
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if (hdr->ctdb_magic != CTDB_MAGIC) {
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ctdb_set_error(client->ctdb, "Non CTDB packet rejected\n");
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return;
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}
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if (hdr->ctdb_version != CTDB_VERSION) {
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ctdb_set_error(client->ctdb, "Bad CTDB version 0x%x rejected\n", hdr->ctdb_version);
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return;
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}
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/* it is the responsibility of the incoming packet function to free 'data' */
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client_incoming_packet(client, data, cnt);
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}
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static void ctdb_accept_client(struct event_context *ev, struct fd_event *fde,
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uint16_t flags, void *private_data)
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{
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struct sockaddr_in addr;
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socklen_t len;
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int fd;
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struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
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struct ctdb_client *client;
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memset(&addr, 0, sizeof(addr));
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len = sizeof(addr);
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fd = accept(ctdb->daemon.sd, (struct sockaddr *)&addr, &len);
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if (fd == -1) {
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return;
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}
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set_non_blocking(fd);
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client = talloc_zero(ctdb, struct ctdb_client);
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client->ctdb = ctdb;
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client->fd = fd;
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client->queue = ctdb_queue_setup(ctdb, client, fd, CTDB_DS_ALIGNMENT,
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ctdb_client_read_cb, client);
|
|
|
|
talloc_set_destructor(client, ctdb_client_destructor);
|
|
}
|
|
|
|
|
|
|
|
static void ctdb_read_from_parent(struct event_context *ev, struct fd_event *fde,
|
|
uint16_t flags, void *private_data)
|
|
{
|
|
int *fd = private_data;
|
|
int cnt;
|
|
char buf;
|
|
|
|
/* XXX this is a good place to try doing some cleaning up before exiting */
|
|
cnt = read(*fd, &buf, 1);
|
|
if (cnt==0) {
|
|
printf("parent process exited. filedescriptor dissappeared\n");
|
|
exit(1);
|
|
} else {
|
|
printf("ctdb: did not expect data from parent process\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
create a unix domain socket and bind it
|
|
return a file descriptor open on the socket
|
|
*/
|
|
static int ux_socket_bind(struct ctdb_context *ctdb)
|
|
{
|
|
struct sockaddr_un addr;
|
|
|
|
ctdb->daemon.sd = socket(AF_UNIX, SOCK_STREAM, 0);
|
|
if (ctdb->daemon.sd == -1) {
|
|
ctdb->daemon.sd = -1;
|
|
return -1;
|
|
}
|
|
|
|
set_non_blocking(ctdb->daemon.sd);
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sun_family = AF_UNIX;
|
|
strncpy(addr.sun_path, ctdb->daemon.name, sizeof(addr.sun_path));
|
|
|
|
if (bind(ctdb->daemon.sd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
|
|
close(ctdb->daemon.sd);
|
|
ctdb->daemon.sd = -1;
|
|
return -1;
|
|
}
|
|
listen(ctdb->daemon.sd, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
delete the socket on exit - called on destruction of autofree context
|
|
*/
|
|
static int unlink_destructor(const char *name)
|
|
{
|
|
unlink(name);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
start the protocol going
|
|
*/
|
|
int ctdbd_start(struct ctdb_context *ctdb)
|
|
{
|
|
pid_t pid;
|
|
static int fd[2];
|
|
int res;
|
|
struct fd_event *fde;
|
|
const char *domain_socket_name;
|
|
|
|
/* generate a name to use for our local socket */
|
|
ctdb->daemon.name = talloc_asprintf(ctdb, "%s.%s", CTDB_PATH, ctdb->address.address);
|
|
/* get rid of any old sockets */
|
|
unlink(ctdb->daemon.name);
|
|
|
|
/* create a unix domain stream socket to listen to */
|
|
res = ux_socket_bind(ctdb);
|
|
if (res!=0) {
|
|
printf("Failed to open CTDB unix domain socket\n");
|
|
exit(10);
|
|
}
|
|
|
|
res = pipe(&fd[0]);
|
|
if (res) {
|
|
printf("Failed to open pipe for CTDB\n");
|
|
exit(1);
|
|
}
|
|
pid = fork();
|
|
if (pid==-1) {
|
|
printf("Failed to fork CTDB daemon\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (pid) {
|
|
close(fd[0]);
|
|
close(ctdb->daemon.sd);
|
|
ctdb->daemon.sd = -1;
|
|
return 0;
|
|
}
|
|
|
|
/* ensure the socket is deleted on exit of the daemon */
|
|
domain_socket_name = talloc_strdup(talloc_autofree_context(), ctdb->daemon.name);
|
|
talloc_set_destructor(domain_socket_name, unlink_destructor);
|
|
|
|
close(fd[1]);
|
|
ctdb_clear_flags(ctdb, CTDB_FLAG_DAEMON_MODE);
|
|
ctdb->ev = event_context_init(NULL);
|
|
fde = event_add_fd(ctdb->ev, ctdb, fd[0], EVENT_FD_READ, ctdb_read_from_parent, &fd[0]);
|
|
fde = event_add_fd(ctdb->ev, ctdb, ctdb->daemon.sd, EVENT_FD_READ, ctdb_accept_client, ctdb);
|
|
ctdb_main_loop(ctdb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
allocate a packet for use in client<->daemon communication
|
|
*/
|
|
void *ctdbd_allocate_pkt(struct ctdb_context *ctdb, size_t len)
|
|
{
|
|
int size;
|
|
|
|
size = (len+(CTDB_DS_ALIGNMENT-1)) & ~(CTDB_DS_ALIGNMENT-1);
|
|
return talloc_size(ctdb, size);
|
|
}
|
|
|
|
int ctdb_daemon_set_message_handler(struct ctdb_context *ctdb, uint32_t srvid,
|
|
ctdb_message_fn_t handler,
|
|
void *private_data)
|
|
{
|
|
return ctdb_register_message_handler(ctdb, ctdb, srvid, handler, private_data);
|
|
}
|
|
|