/* make a remote ctdb call - async send. Called in daemon context. This constructs a ctdb_call request and queues it for processing. This call never blocks. */ struct ctdb_call_state *ctdb_daemon_call_send_remote(struct ctdb_db_context *ctdb_db, struct ctdb_call *call, struct ctdb_ltdb_header *header) { uint32_t len; struct ctdb_call_state *state; struct ctdb_context *ctdb = ctdb_db->ctdb; state = talloc_zero(ctdb_db, struct ctdb_call_state); CTDB_NO_MEMORY_NULL(ctdb, state); len = offsetof(struct ctdb_req_call, data) + call->key.dsize + call->call_data.dsize; state->c = ctdb->methods->allocate_pkt(state, len); CTDB_NO_MEMORY_NULL(ctdb, state->c); talloc_set_name_const(state->c, "req_call packet"); state->c->hdr.length = len; state->c->hdr.ctdb_magic = CTDB_MAGIC; state->c->hdr.ctdb_version = CTDB_VERSION; state->c->hdr.operation = CTDB_REQ_CALL; state->c->hdr.destnode = header->dmaster; state->c->hdr.srcnode = ctdb->vnn; /* this limits us to 16k outstanding messages - not unreasonable */ state->c->hdr.reqid = idr_get_new(ctdb->idr, state, 0xFFFF); state->c->flags = call->flags; state->c->db_id = ctdb_db->db_id; state->c->callid = call->call_id; state->c->keylen = call->key.dsize; state->c->calldatalen = call->call_data.dsize; memcpy(&state->c->data[0], call->key.dptr, call->key.dsize); memcpy(&state->c->data[call->key.dsize], call->call_data.dptr, call->call_data.dsize); state->call = *call; state->call.call_data.dptr = &state->c->data[call->key.dsize]; state->call.key.dptr = &state->c->data[0]; state->node = ctdb->nodes[header->dmaster]; state->state = CTDB_CALL_WAIT; state->header = *header; state->ctdb_db = ctdb_db; talloc_set_destructor(state, ctdb_call_destructor); ctdb_queue_packet(ctdb, &state->c->hdr); event_add_timed(ctdb->ev, state, timeval_current_ofs(CTDB_REQ_TIMEOUT, 0), ctdb_call_timeout, state); return state; }
/* called when a CTDB_REPLY_REDIRECT packet comes in This packet arrives when we have sent a CTDB_REQ_CALL request and the node that received it is not the dmaster for the given key. We are given a hint as to what node to try next. */ void ctdb_reply_redirect(struct ctdb_context *ctdb, struct ctdb_req_header *hdr) { struct ctdb_reply_redirect *c = (struct ctdb_reply_redirect *)hdr; struct ctdb_call_state *state; state = idr_find_type(ctdb->idr, hdr->reqid, struct ctdb_call_state); if (state == NULL) return; talloc_steal(state, c); /* don't allow for too many redirects */ if (state->redirect_count++ == CTDB_MAX_REDIRECT) { c->dmaster = ctdb_lmaster(ctdb, &state->call.key); } /* send it off again */ state->node = ctdb->nodes[c->dmaster]; state->c->hdr.destnode = c->dmaster; ctdb_queue_packet(ctdb, &state->c->hdr); }
/* send a redirect reply */ static void ctdb_call_send_redirect(struct ctdb_context *ctdb, struct ctdb_req_call *c, struct ctdb_ltdb_header *header) { struct ctdb_reply_redirect *r; r = ctdb->methods->allocate_pkt(ctdb, sizeof(*r)); CTDB_NO_MEMORY_FATAL(ctdb, r); talloc_set_name_const(r, "send_redirect packet"); r->hdr.length = sizeof(*r); r->hdr.ctdb_magic = CTDB_MAGIC; r->hdr.ctdb_version = CTDB_VERSION; r->hdr.operation = CTDB_REPLY_REDIRECT; r->hdr.destnode = c->hdr.srcnode; r->hdr.srcnode = ctdb->vnn; r->hdr.reqid = c->hdr.reqid; r->dmaster = header->dmaster; ctdb_queue_packet(ctdb, &r->hdr); talloc_free(r); }
static void ctdb_send_error(struct ctdb_context *ctdb, struct ctdb_req_header *hdr, uint32_t status, const char *fmt, ...) { va_list ap; struct ctdb_reply_error *r; char *msg; int msglen, len; va_start(ap, fmt); msg = talloc_vasprintf(ctdb, fmt, ap); if (msg == NULL) { ctdb_fatal(ctdb, "Unable to allocate error in ctdb_send_error\n"); } va_end(ap); msglen = strlen(msg)+1; len = offsetof(struct ctdb_reply_error, msg); r = ctdb->methods->allocate_pkt(msg, len + msglen); CTDB_NO_MEMORY_FATAL(ctdb, r); talloc_set_name_const(r, "send_error packet"); r->hdr.length = len + msglen; r->hdr.ctdb_magic = CTDB_MAGIC; r->hdr.ctdb_version = CTDB_VERSION; r->hdr.operation = CTDB_REPLY_ERROR; r->hdr.destnode = hdr->srcnode; r->hdr.srcnode = ctdb->vnn; r->hdr.reqid = hdr->reqid; r->status = status; r->msglen = msglen; memcpy(&r->msg[0], msg, msglen); ctdb_queue_packet(ctdb, &r->hdr); talloc_free(msg); }
/* send a dmaster request (give another node the dmaster for a record) This is always sent to the lmaster, which ensures that the lmaster always knows who the dmaster is. The lmaster will then send a CTDB_REPLY_DMASTER to the new dmaster */ static void ctdb_call_send_dmaster(struct ctdb_db_context *ctdb_db, struct ctdb_req_call *c, struct ctdb_ltdb_header *header, TDB_DATA *key, TDB_DATA *data) { struct ctdb_req_dmaster *r; struct ctdb_context *ctdb = ctdb_db->ctdb; int len; len = offsetof(struct ctdb_req_dmaster, data) + key->dsize + data->dsize; r = ctdb->methods->allocate_pkt(ctdb, len); CTDB_NO_MEMORY_FATAL(ctdb, r); talloc_set_name_const(r, "send_dmaster packet"); r->hdr.length = len; r->hdr.ctdb_magic = CTDB_MAGIC; r->hdr.ctdb_version = CTDB_VERSION; r->hdr.operation = CTDB_REQ_DMASTER; r->hdr.destnode = ctdb_lmaster(ctdb, key); r->hdr.srcnode = ctdb->vnn; r->hdr.reqid = c->hdr.reqid; r->db_id = c->db_id; r->dmaster = c->hdr.srcnode; r->keylen = key->dsize; r->datalen = data->dsize; memcpy(&r->data[0], key->dptr, key->dsize); memcpy(&r->data[key->dsize], data->dptr, data->dsize); /* XXX - probably not necessary when lmaster==dmaster update the ltdb to record the new dmaster */ header->dmaster = r->hdr.destnode; ctdb_ltdb_store(ctdb_db, *key, header, *data); ctdb_queue_packet(ctdb, &r->hdr); talloc_free(r); }
/* called when a CTDB_REQ_CALL packet comes in */ void ctdb_request_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr) { struct ctdb_req_call *c = (struct ctdb_req_call *)hdr; TDB_DATA data; struct ctdb_reply_call *r; int ret, len; struct ctdb_ltdb_header header; struct ctdb_call call; struct ctdb_db_context *ctdb_db; ctdb_db = find_ctdb_db(ctdb, c->db_id); if (!ctdb_db) { ctdb_send_error(ctdb, hdr, -1, "Unknown database in request. db_id==0x%08x", c->db_id); return; } call.call_id = c->callid; call.key.dptr = c->data; call.key.dsize = c->keylen; call.call_data.dptr = c->data + c->keylen; call.call_data.dsize = c->calldatalen; /* determine if we are the dmaster for this key. This also fetches the record data (if any), thus avoiding a 2nd fetch of the data if the call will be answered locally */ ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, call.key, &header, hdr, &data, ctdb_recv_raw_pkt, ctdb); if (ret == -1) { ctdb_send_error(ctdb, hdr, ret, "ltdb fetch failed in ctdb_request_call"); return; } if (ret == -2) { DEBUG(2,(__location__ " deferred ctdb_request_call\n")); return; } /* if we are not the dmaster, then send a redirect to the requesting node */ if (header.dmaster != ctdb->vnn) { ctdb_call_send_redirect(ctdb, c, &header); talloc_free(data.dptr); ctdb_ltdb_unlock(ctdb_db, call.key); return; } /* if this nodes has done enough consecutive calls on the same record then give them the record or if the node requested an immediate migration */ if ( (header.laccessor == c->hdr.srcnode && header.lacount >= ctdb->max_lacount) || c->flags&CTDB_IMMEDIATE_MIGRATION ) { ctdb_call_send_dmaster(ctdb_db, c, &header, &call.key, &data); talloc_free(data.dptr); ctdb_ltdb_unlock(ctdb_db, call.key); return; } ctdb_call_local(ctdb_db, &call, &header, &data, c->hdr.srcnode); ctdb_ltdb_unlock(ctdb_db, call.key); len = offsetof(struct ctdb_reply_call, data) + call.reply_data.dsize; r = ctdb->methods->allocate_pkt(ctdb, len); CTDB_NO_MEMORY_FATAL(ctdb, r); talloc_set_name_const(r, "reply_call packet"); r->hdr.length = len; r->hdr.ctdb_magic = CTDB_MAGIC; r->hdr.ctdb_version = CTDB_VERSION; r->hdr.operation = CTDB_REPLY_CALL; r->hdr.destnode = hdr->srcnode; r->hdr.srcnode = hdr->destnode; r->hdr.reqid = hdr->reqid; r->status = call.status; r->datalen = call.reply_data.dsize; if (call.reply_data.dsize) { memcpy(&r->data[0], call.reply_data.dptr, call.reply_data.dsize); talloc_free(call.reply_data.dptr); } ctdb_queue_packet(ctdb, &r->hdr); talloc_free(r); }
/* called when a CTDB_REQ_DMASTER packet comes in this comes into the lmaster for a record when the current dmaster wants to give up the dmaster role and give it to someone else */ void ctdb_request_dmaster(struct ctdb_context *ctdb, struct ctdb_req_header *hdr) { struct ctdb_req_dmaster *c = (struct ctdb_req_dmaster *)hdr; struct ctdb_reply_dmaster *r; TDB_DATA key, data, data2; struct ctdb_ltdb_header header; struct ctdb_db_context *ctdb_db; int ret, len; TALLOC_CTX *tmp_ctx; key.dptr = c->data; key.dsize = c->keylen; data.dptr = c->data + c->keylen; data.dsize = c->datalen; ctdb_db = find_ctdb_db(ctdb, c->db_id); if (!ctdb_db) { ctdb_send_error(ctdb, hdr, -1, "Unknown database in request. db_id==0x%08x", c->db_id); return; } /* fetch the current record */ ret = ctdb_ltdb_lock_fetch_requeue(ctdb_db, key, &header, hdr, &data2, ctdb_recv_raw_pkt, ctdb); if (ret == -1) { ctdb_fatal(ctdb, "ctdb_req_dmaster failed to fetch record"); return; } if (ret == -2) { DEBUG(2,(__location__ " deferring ctdb_request_dmaster\n")); return; } /* its a protocol error if the sending node is not the current dmaster */ if (header.dmaster != hdr->srcnode && hdr->srcnode != ctdb_lmaster(ctdb_db->ctdb, &key)) { ctdb_fatal(ctdb, "dmaster request from non-master"); return; } header.dmaster = c->dmaster; ret = ctdb_ltdb_store(ctdb_db, key, &header, data); ctdb_ltdb_unlock(ctdb_db, key); if (ret != 0) { ctdb_fatal(ctdb, "ctdb_req_dmaster unable to update dmaster"); return; } /* put the packet on a temporary context, allowing us to safely free it below even if ctdb_reply_dmaster() has freed it already */ tmp_ctx = talloc_new(ctdb); /* send the CTDB_REPLY_DMASTER */ len = offsetof(struct ctdb_reply_dmaster, data) + data.dsize; r = ctdb->methods->allocate_pkt(tmp_ctx, len); CTDB_NO_MEMORY_FATAL(ctdb, r); talloc_set_name_const(r, "reply_dmaster packet"); r->hdr.length = len; r->hdr.ctdb_magic = CTDB_MAGIC; r->hdr.ctdb_version = CTDB_VERSION; r->hdr.operation = CTDB_REPLY_DMASTER; r->hdr.destnode = c->dmaster; r->hdr.srcnode = ctdb->vnn; r->hdr.reqid = hdr->reqid; r->datalen = data.dsize; memcpy(&r->data[0], data.dptr, data.dsize); ctdb_queue_packet(ctdb, &r->hdr); talloc_free(tmp_ctx); }
/* send a control message to a node */ int ctdb_daemon_send_control(struct ctdb_context *ctdb, uint32_t destnode, uint64_t srvid, uint32_t opcode, uint32_t client_id, uint32_t flags, TDB_DATA data, ctdb_control_callback_fn_t callback, void *private_data) { struct ctdb_req_control_old *c; struct ctdb_control_state *state; size_t len; if (ctdb->methods == NULL) { DEBUG(DEBUG_INFO,(__location__ " Failed to send control. Transport is DOWN\n")); return -1; } if (((destnode == CTDB_BROADCAST_VNNMAP) || (destnode == CTDB_BROADCAST_ALL) || (destnode == CTDB_BROADCAST_CONNECTED)) && !(flags & CTDB_CTRL_FLAG_NOREPLY)) { DEBUG(DEBUG_CRIT,("Attempt to broadcast control without NOREPLY\n")); return -1; } if (destnode != CTDB_BROADCAST_VNNMAP && destnode != CTDB_BROADCAST_ALL && destnode != CTDB_BROADCAST_CONNECTED && (!ctdb_validate_pnn(ctdb, destnode) || (ctdb->nodes[destnode]->flags & NODE_FLAGS_DISCONNECTED))) { if (!(flags & CTDB_CTRL_FLAG_NOREPLY)) { callback(ctdb, -1, tdb_null, "ctdb_control to disconnected node", private_data); } return 0; } /* the state is made a child of private_data if possible. This means any reply will be discarded if the private_data goes away */ state = talloc(private_data?private_data:ctdb, struct ctdb_control_state); CTDB_NO_MEMORY(ctdb, state); state->reqid = reqid_new(ctdb->idr, state); state->callback = callback; state->private_data = private_data; state->ctdb = ctdb; state->flags = flags; talloc_set_destructor(state, ctdb_control_destructor); len = offsetof(struct ctdb_req_control_old, data) + data.dsize; c = ctdb_transport_allocate(ctdb, state, CTDB_REQ_CONTROL, len, struct ctdb_req_control_old); CTDB_NO_MEMORY(ctdb, c); talloc_set_name_const(c, "ctdb_req_control packet"); c->hdr.destnode = destnode; c->hdr.reqid = state->reqid; c->opcode = opcode; c->client_id = client_id; c->flags = flags; c->srvid = srvid; c->datalen = data.dsize; if (data.dsize) { memcpy(&c->data[0], data.dptr, data.dsize); } ctdb_queue_packet(ctdb, &c->hdr); if (flags & CTDB_CTRL_FLAG_NOREPLY) { talloc_free(state); return 0; } if (ctdb->tunable.control_timeout) { tevent_add_timer(ctdb->ev, state, timeval_current_ofs(ctdb->tunable.control_timeout, 0), ctdb_control_timeout, state); } talloc_free(c); return 0; }