diff options
Diffstat (limited to 'source4/cluster/ctdb/server/ctdb_call.c')
| -rw-r--r-- | source4/cluster/ctdb/server/ctdb_call.c | 737 |
1 files changed, 737 insertions, 0 deletions
diff --git a/source4/cluster/ctdb/server/ctdb_call.c b/source4/cluster/ctdb/server/ctdb_call.c new file mode 100644 index 0000000000..bbe07717ed --- /dev/null +++ b/source4/cluster/ctdb/server/ctdb_call.c @@ -0,0 +1,737 @@ +/* + ctdb_call protocol code + + Copyright (C) Andrew Tridgell 2006 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, see <http://www.gnu.org/licenses/>. +*/ +/* + see http://wiki.samba.org/index.php/Samba_%26_Clustering for + protocol design and packet details +*/ +#include "includes.h" +#include "lib/events/events.h" +#include "lib/tdb/include/tdb.h" +#include "lib/util/dlinklist.h" +#include "system/network.h" +#include "system/filesys.h" +#include "../include/ctdb_private.h" + +/* + find the ctdb_db from a db index + */ + struct ctdb_db_context *find_ctdb_db(struct ctdb_context *ctdb, uint32_t id) +{ + struct ctdb_db_context *ctdb_db; + + for (ctdb_db=ctdb->db_list; ctdb_db; ctdb_db=ctdb_db->next) { + if (ctdb_db->db_id == id) { + break; + } + } + return ctdb_db; +} + + +/* + a varient of input packet that can be used in lock requeue +*/ +static void ctdb_call_input_pkt(void *p, struct ctdb_req_header *hdr) +{ + struct ctdb_context *ctdb = talloc_get_type(p, struct ctdb_context); + ctdb_input_pkt(ctdb, hdr); +} + + +/* + send an error reply +*/ +static void ctdb_send_error(struct ctdb_context *ctdb, + struct ctdb_req_header *hdr, uint32_t status, + const char *fmt, ...) PRINTF_ATTRIBUTE(4,5); +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_transport_allocate(ctdb, msg, CTDB_REPLY_ERROR, len + msglen, + struct ctdb_reply_error); + CTDB_NO_MEMORY_FATAL(ctdb, r); + + r->hdr.destnode = hdr->srcnode; + 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 redirect reply +*/ +static void ctdb_call_send_redirect(struct ctdb_context *ctdb, + TDB_DATA key, + struct ctdb_req_call *c, + struct ctdb_ltdb_header *header) +{ + + uint32_t lmaster = ctdb_lmaster(ctdb, &key); + if (ctdb->vnn == lmaster) { + c->hdr.destnode = header->dmaster; + } else if ((c->hopcount % ctdb->tunable.max_redirect_count) == 0) { + c->hdr.destnode = lmaster; + } else { + c->hdr.destnode = header->dmaster; + } + c->hopcount++; + ctdb_queue_packet(ctdb, &c->hdr); +} + + +/* + send a dmaster reply + + caller must have the chainlock before calling this routine. Caller must be + the lmaster +*/ +static void ctdb_send_dmaster_reply(struct ctdb_db_context *ctdb_db, + struct ctdb_ltdb_header *header, + TDB_DATA key, TDB_DATA data, + uint32_t new_dmaster, + uint32_t reqid) +{ + struct ctdb_context *ctdb = ctdb_db->ctdb; + struct ctdb_reply_dmaster *r; + int ret, len; + TALLOC_CTX *tmp_ctx; + + if (ctdb->vnn != ctdb_lmaster(ctdb, &key)) { + DEBUG(0,(__location__ " Caller is not lmaster!\n")); + return; + } + + header->dmaster = new_dmaster; + ret = ctdb_ltdb_store(ctdb_db, key, header, data); + 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) + key.dsize + data.dsize; + r = ctdb_transport_allocate(ctdb, tmp_ctx, CTDB_REPLY_DMASTER, len, + struct ctdb_reply_dmaster); + CTDB_NO_MEMORY_FATAL(ctdb, r); + + r->hdr.destnode = new_dmaster; + r->hdr.reqid = reqid; + r->rsn = header->rsn; + r->keylen = key.dsize; + r->datalen = data.dsize; + r->db_id = ctdb_db->db_id; + memcpy(&r->data[0], key.dptr, key.dsize); + memcpy(&r->data[key.dsize], data.dptr, data.dsize); + + ctdb_queue_packet(ctdb, &r->hdr); + + talloc_free(tmp_ctx); +} + +/* + 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; + uint32_t lmaster = ctdb_lmaster(ctdb, key); + + if (lmaster == ctdb->vnn) { + ctdb_send_dmaster_reply(ctdb_db, header, *key, *data, + c->hdr.srcnode, c->hdr.reqid); + return; + } + + len = offsetof(struct ctdb_req_dmaster, data) + key->dsize + data->dsize; + r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_DMASTER, len, + struct ctdb_req_dmaster); + CTDB_NO_MEMORY_FATAL(ctdb, r); + r->hdr.destnode = lmaster; + r->hdr.reqid = c->hdr.reqid; + r->db_id = c->db_id; + r->rsn = header->rsn; + 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); + + header->dmaster = c->hdr.srcnode; + if (ctdb_ltdb_store(ctdb_db, *key, header, *data) != 0) { + ctdb_fatal(ctdb, "Failed to store record in ctdb_call_send_dmaster"); + } + + ctdb_queue_packet(ctdb, &r->hdr); + + talloc_free(r); +} + +/* + called when a CTDB_REPLY_DMASTER packet comes in, or when the lmaster + gets a CTDB_REQUEST_DMASTER for itself. We become the dmaster. + + must be called with the chainlock held. This function releases the chainlock +*/ +static void ctdb_become_dmaster(struct ctdb_db_context *ctdb_db, + uint32_t reqid, TDB_DATA key, TDB_DATA data, + uint64_t rsn) +{ + struct ctdb_call_state *state; + struct ctdb_context *ctdb = ctdb_db->ctdb; + struct ctdb_ltdb_header header; + + DEBUG(2,("vnn %u dmaster response %08x\n", ctdb->vnn, ctdb_hash(&key))); + + ZERO_STRUCT(header); + header.rsn = rsn + 1; + header.dmaster = ctdb->vnn; + + if (ctdb_ltdb_store(ctdb_db, key, &header, data) != 0) { + ctdb_fatal(ctdb, "ctdb_reply_dmaster store failed\n"); + ctdb_ltdb_unlock(ctdb_db, key); + return; + } + + state = ctdb_reqid_find(ctdb, reqid, struct ctdb_call_state); + + if (state == NULL) { + DEBUG(0,("vnn %u Invalid reqid %u in ctdb_become_dmaster\n", + ctdb->vnn, reqid)); + ctdb_ltdb_unlock(ctdb_db, key); + return; + } + + if (reqid != state->reqid) { + /* we found a record but it was the wrong one */ + DEBUG(0, ("Dropped orphan in ctdb_become_dmaster with reqid:%u\n",reqid)); + ctdb_ltdb_unlock(ctdb_db, key); + return; + } + + ctdb_call_local(ctdb_db, &state->call, &header, state, &data, ctdb->vnn); + + ctdb_ltdb_unlock(ctdb_db, state->call.key); + + state->state = CTDB_CALL_DONE; + if (state->async.fn) { + state->async.fn(state); + } +} + + + +/* + 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; + TDB_DATA key, data, data2; + struct ctdb_ltdb_header header; + struct ctdb_db_context *ctdb_db; + int ret; + + 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_call_input_pkt, ctdb, False); + 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; + } + + if (ctdb_lmaster(ctdb, &key) != ctdb->vnn) { + DEBUG(0,("vnn %u dmaster request to non-lmaster lmaster=%u gen=%u curgen=%u\n", + ctdb->vnn, ctdb_lmaster(ctdb, &key), + hdr->generation, ctdb->vnn_map->generation)); + ctdb_fatal(ctdb, "ctdb_req_dmaster to non-lmaster"); + } + + DEBUG(2,("vnn %u dmaster request on %08x for %u from %u\n", + ctdb->vnn, ctdb_hash(&key), c->dmaster, c->hdr.srcnode)); + + /* its a protocol error if the sending node is not the current dmaster */ + if (header.dmaster != hdr->srcnode) { + DEBUG(0,("vnn %u dmaster request non-master %u dmaster=%u key %08x dbid 0x%08x gen=%u curgen=%u\n", + ctdb->vnn, hdr->srcnode, header.dmaster, ctdb_hash(&key), + ctdb_db->db_id, hdr->generation, ctdb->vnn_map->generation)); + ctdb_fatal(ctdb, "ctdb_req_dmaster from non-master"); + return; + } + + /* use the rsn from the sending node */ + header.rsn = c->rsn; + + /* check if the new dmaster is the lmaster, in which case we + skip the dmaster reply */ + if (c->dmaster == ctdb->vnn) { + ctdb_become_dmaster(ctdb_db, hdr->reqid, key, data, c->rsn); + } else { + ctdb_send_dmaster_reply(ctdb_db, &header, key, data, c->dmaster, hdr->reqid); + ctdb_ltdb_unlock(ctdb_db, key); + } +} + + +/* + 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_call_input_pkt, ctdb, False); + 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) { + talloc_free(data.dptr); + ctdb_call_send_redirect(ctdb, call.key, c, &header); + ctdb_ltdb_unlock(ctdb_db, call.key); + return; + } + + if (c->hopcount > ctdb->statistics.max_hop_count) { + ctdb->statistics.max_hop_count = c->hopcount; + } + + /* 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 ( c->hdr.srcnode != ctdb->vnn && + ((header.laccessor == c->hdr.srcnode + && header.lacount >= ctdb->tunable.max_lacount) + || (c->flags & CTDB_IMMEDIATE_MIGRATION)) ) { + DEBUG(2,("vnn %u starting migration of %08x to %u\n", + ctdb->vnn, ctdb_hash(&call.key), c->hdr.srcnode)); + 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, hdr, &data, c->hdr.srcnode); + + ctdb_ltdb_unlock(ctdb_db, call.key); + + len = offsetof(struct ctdb_reply_call, data) + call.reply_data.dsize; + r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REPLY_CALL, len, + struct ctdb_reply_call); + CTDB_NO_MEMORY_FATAL(ctdb, r); + r->hdr.destnode = hdr->srcnode; + 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); + } + + ctdb_queue_packet(ctdb, &r->hdr); + + talloc_free(r); +} + +/* + called when a CTDB_REPLY_CALL packet comes in + + This packet comes in response to a CTDB_REQ_CALL request packet. It + contains any reply data from the call +*/ +void ctdb_reply_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr) +{ + struct ctdb_reply_call *c = (struct ctdb_reply_call *)hdr; + struct ctdb_call_state *state; + + state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_call_state); + if (state == NULL) { + DEBUG(0, (__location__ " reqid %u not found\n", hdr->reqid)); + return; + } + + if (hdr->reqid != state->reqid) { + /* we found a record but it was the wrong one */ + DEBUG(0, ("Dropped orphaned call reply with reqid:%u\n",hdr->reqid)); + return; + } + + state->call.reply_data.dptr = c->data; + state->call.reply_data.dsize = c->datalen; + state->call.status = c->status; + + talloc_steal(state, c); + + state->state = CTDB_CALL_DONE; + if (state->async.fn) { + state->async.fn(state); + } +} + + +/* + called when a CTDB_REPLY_DMASTER packet comes in + + This packet comes in from the lmaster response to a CTDB_REQ_CALL + request packet. It means that the current dmaster wants to give us + the dmaster role +*/ +void ctdb_reply_dmaster(struct ctdb_context *ctdb, struct ctdb_req_header *hdr) +{ + struct ctdb_reply_dmaster *c = (struct ctdb_reply_dmaster *)hdr; + struct ctdb_db_context *ctdb_db; + TDB_DATA key, data; + int ret; + + ctdb_db = find_ctdb_db(ctdb, c->db_id); + if (ctdb_db == NULL) { + DEBUG(0,("Unknown db_id 0x%x in ctdb_reply_dmaster\n", c->db_id)); + return; + } + + key.dptr = c->data; + key.dsize = c->keylen; + data.dptr = &c->data[key.dsize]; + data.dsize = c->datalen; + + ret = ctdb_ltdb_lock_requeue(ctdb_db, key, hdr, + ctdb_call_input_pkt, ctdb, False); + if (ret == -2) { + return; + } + if (ret != 0) { + DEBUG(0,(__location__ " Failed to get lock in ctdb_reply_dmaster\n")); + return; + } + + ctdb_become_dmaster(ctdb_db, hdr->reqid, key, data, c->rsn); +} + + +/* + called when a CTDB_REPLY_ERROR packet comes in +*/ +void ctdb_reply_error(struct ctdb_context *ctdb, struct ctdb_req_header *hdr) +{ + struct ctdb_reply_error *c = (struct ctdb_reply_error *)hdr; + struct ctdb_call_state *state; + + state = ctdb_reqid_find(ctdb, hdr->reqid, struct ctdb_call_state); + if (state == NULL) { + DEBUG(0,("vnn %u Invalid reqid %u in ctdb_reply_error\n", + ctdb->vnn, hdr->reqid)); + return; + } + + if (hdr->reqid != state->reqid) { + /* we found a record but it was the wrong one */ + DEBUG(0, ("Dropped orphaned error reply with reqid:%u\n",hdr->reqid)); + return; + } + + talloc_steal(state, c); + + state->state = CTDB_CALL_ERROR; + state->errmsg = (char *)c->msg; + if (state->async.fn) { + state->async.fn(state); + } +} + + +/* + destroy a ctdb_call +*/ +static int ctdb_call_destructor(struct ctdb_call_state *state) +{ + DLIST_REMOVE(state->ctdb_db->ctdb->pending_calls, state); + ctdb_reqid_remove(state->ctdb_db->ctdb, state->reqid); + return 0; +} + + +/* + called when a ctdb_call needs to be resent after a reconfigure event +*/ +static void ctdb_call_resend(struct ctdb_call_state *state) +{ + struct ctdb_context *ctdb = state->ctdb_db->ctdb; + + state->generation = ctdb->vnn_map->generation; + + /* use a new reqid, in case the old reply does eventually come in */ + ctdb_reqid_remove(ctdb, state->reqid); + state->reqid = ctdb_reqid_new(ctdb, state); + state->c->hdr.reqid = state->reqid; + + /* update the generation count for this request, so its valid with the new vnn_map */ + state->c->hdr.generation = state->generation; + + /* send the packet to ourselves, it will be redirected appropriately */ + state->c->hdr.destnode = ctdb->vnn; + + ctdb_queue_packet(ctdb, &state->c->hdr); + DEBUG(0,("resent ctdb_call\n")); +} + +/* + resend all pending calls on recovery + */ +void ctdb_call_resend_all(struct ctdb_context *ctdb) +{ + struct ctdb_call_state *state, *next; + for (state=ctdb->pending_calls;state;state=next) { + next = state->next; + ctdb_call_resend(state); + } +} + +/* + this allows the caller to setup a async.fn +*/ +static void call_local_trigger(struct event_context *ev, struct timed_event *te, + struct timeval t, void *private_data) +{ + struct ctdb_call_state *state = talloc_get_type(private_data, struct ctdb_call_state); + if (state->async.fn) { + state->async.fn(state); + } +} + + +/* + construct an event driven local ctdb_call + + this is used so that locally processed ctdb_call requests are processed + in an event driven manner +*/ +struct ctdb_call_state *ctdb_call_local_send(struct ctdb_db_context *ctdb_db, + struct ctdb_call *call, + struct ctdb_ltdb_header *header, + TDB_DATA *data) +{ + struct ctdb_call_state *state; + struct ctdb_context *ctdb = ctdb_db->ctdb; + int ret; + + state = talloc_zero(ctdb_db, struct ctdb_call_state); + CTDB_NO_MEMORY_NULL(ctdb, state); + + talloc_steal(state, data->dptr); + + state->state = CTDB_CALL_DONE; + state->call = *call; + state->ctdb_db = ctdb_db; + + ret = ctdb_call_local(ctdb_db, &state->call, header, state, data, ctdb->vnn); + + event_add_timed(ctdb->ev, state, timeval_zero(), call_local_trigger, state); + + return state; +} + + +/* + 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); + state->reqid = ctdb_reqid_new(ctdb, state); + state->ctdb_db = ctdb_db; + talloc_set_destructor(state, ctdb_call_destructor); + + len = offsetof(struct ctdb_req_call, data) + call->key.dsize + call->call_data.dsize; + state->c = ctdb_transport_allocate(ctdb, state, CTDB_REQ_CALL, len, + struct ctdb_req_call); + CTDB_NO_MEMORY_NULL(ctdb, state->c); + state->c->hdr.destnode = header->dmaster; + + /* this limits us to 16k outstanding messages - not unreasonable */ + state->c->hdr.reqid = state->reqid; + state->c->flags = call->flags; + state->c->db_id = ctdb_db->db_id; + state->c->callid = call->call_id; + state->c->hopcount = 0; + 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->state = CTDB_CALL_WAIT; + state->generation = ctdb->vnn_map->generation; + + DLIST_ADD(ctdb->pending_calls, state); + + ctdb_queue_packet(ctdb, &state->c->hdr); + + return state; +} + +/* + make a remote ctdb call - async recv - called in daemon context + + This is called when the program wants to wait for a ctdb_call to complete and get the + results. This call will block unless the call has already completed. +*/ +int ctdb_daemon_call_recv(struct ctdb_call_state *state, struct ctdb_call *call) +{ + while (state->state < CTDB_CALL_DONE) { + event_loop_once(state->ctdb_db->ctdb->ev); + } + if (state->state != CTDB_CALL_DONE) { + ctdb_set_error(state->ctdb_db->ctdb, "%s", state->errmsg); + talloc_free(state); + return -1; + } + + if (state->call.reply_data.dsize) { + call->reply_data.dptr = talloc_memdup(state->ctdb_db->ctdb, + state->call.reply_data.dptr, + state->call.reply_data.dsize); + call->reply_data.dsize = state->call.reply_data.dsize; + } else { + call->reply_data.dptr = NULL; + call->reply_data.dsize = 0; + } + call->status = state->call.status; + talloc_free(state); + return 0; +} + + +/* + send a keepalive packet to the other node +*/ +void ctdb_send_keepalive(struct ctdb_context *ctdb, uint32_t destnode) +{ + struct ctdb_req_keepalive *r; + + r = ctdb_transport_allocate(ctdb, ctdb, CTDB_REQ_KEEPALIVE, + sizeof(struct ctdb_req_keepalive), + struct ctdb_req_keepalive); + CTDB_NO_MEMORY_FATAL(ctdb, r); + r->hdr.destnode = destnode; + r->hdr.reqid = 0; + + ctdb->statistics.keepalive_packets_sent++; + + ctdb_queue_packet(ctdb, &r->hdr); + + talloc_free(r); +} |