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samba-mirror/ctdb/common/ctdb_call.c

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/*
ctdb_call protocol code
Copyright (C) Andrew Tridgell 2006
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
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 "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;
}
/*
local version of ctdb_call
*/
int ctdb_call_local(struct ctdb_db_context *ctdb_db, struct ctdb_call *call,
struct ctdb_ltdb_header *header, TALLOC_CTX *mem_ctx,
TDB_DATA *data, uint32_t caller)
{
struct ctdb_call_info *c;
struct ctdb_registered_call *fn;
struct ctdb_context *ctdb = ctdb_db->ctdb;
c = talloc(ctdb, struct ctdb_call_info);
CTDB_NO_MEMORY(ctdb, c);
c->key = call->key;
c->call_data = &call->call_data;
c->record_data.dptr = talloc_memdup(c, data->dptr, data->dsize);
c->record_data.dsize = data->dsize;
CTDB_NO_MEMORY(ctdb, c->record_data.dptr);
c->new_data = NULL;
c->reply_data = NULL;
c->status = 0;
for (fn=ctdb_db->calls;fn;fn=fn->next) {
if (fn->id == call->call_id) break;
}
if (fn == NULL) {
ctdb_set_error(ctdb, "Unknown call id %u\n", call->call_id);
talloc_free(c);
return -1;
}
if (fn->fn(c) != 0) {
ctdb_set_error(ctdb, "ctdb_call %u failed\n", call->call_id);
talloc_free(c);
return -1;
}
if (header->laccessor != caller) {
header->lacount = 0;
}
header->laccessor = caller;
header->lacount++;
/* we need to force the record to be written out if this was a remote access,
so that the lacount is updated */
if (c->new_data == NULL && header->laccessor != ctdb->vnn) {
c->new_data = &c->record_data;
}
if (c->new_data) {
/* XXX check that we always have the lock here? */
if (ctdb_ltdb_store(ctdb_db, call->key, header, *c->new_data) != 0) {
ctdb_set_error(ctdb, "ctdb_call tdb_store failed\n");
talloc_free(c);
return -1;
}
}
if (c->reply_data) {
call->reply_data = *c->reply_data;
talloc_steal(ctdb, call->reply_data.dptr);
talloc_set_name_const(call->reply_data.dptr, __location__);
} else {
call->reply_data.dptr = NULL;
call->reply_data.dsize = 0;
}
call->status = c->status;
talloc_free(c);
return 0;
}
/*
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_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:%d\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_recv_raw_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\n",
ctdb->vnn, ctdb_lmaster(ctdb, &key)));
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\n",
ctdb->vnn, hdr->srcnode, header.dmaster, ctdb_hash(&key)));
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_recv_raw_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->status.max_hop_count) {
ctdb->status.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->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 %d 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:%d\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_recv_raw_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:%d\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->status.keepalive_packets_sent++;
ctdb_queue_packet(ctdb, &r->hdr);
talloc_free(r);
}