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/*
persistent store logic
Copyright (C) Andrew Tridgell 2007
Copyright (C) Ronnie Sahlberg 2007
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/>.
*/
#include "replace.h"
#include "system/filesys.h"
#include "system/network.h"
#include "system/time.h"
#include "system/wait.h"
#include <talloc.h>
#include <tevent.h>
#include "lib/tdb_wrap/tdb_wrap.h"
#include "lib/util/debug.h"
#include "lib/util/samba_util.h"
#include "ctdb_private.h"
#include "common/reqid.h"
#include "common/common.h"
#include "common/logging.h"
struct ctdb_persistent_state {
struct ctdb_context *ctdb;
struct ctdb_db_context *ctdb_db; /* used by trans3_commit */
struct ctdb_client *client; /* used by trans3_commit */
struct ctdb_req_control_old *c;
const char *errormsg;
uint32_t num_pending;
int32_t status;
uint32_t num_failed, num_sent;
};
/*
1) all nodes fail, and all nodes reply
2) some nodes fail, all nodes reply
3) some nodes timeout
4) all nodes succeed
*/
/*
called when a node has acknowledged a ctdb_control_update_record call
*/
static void ctdb_persistent_callback(struct ctdb_context *ctdb,
int32_t status, TDB_DATA data,
const char *errormsg,
void *private_data)
{
struct ctdb_persistent_state *state = talloc_get_type(private_data,
struct ctdb_persistent_state);
if (ctdb->recovery_mode != CTDB_RECOVERY_NORMAL) {
DEBUG(DEBUG_INFO, ("ctdb_persistent_callback: ignoring reply "
"during recovery\n"));
return;
}
if (status != 0) {
DEBUG(DEBUG_ERR,("ctdb_persistent_callback failed with status %d (%s)\n",
status, errormsg?errormsg:"no error message given"));
state->status = status;
state->errormsg = errormsg;
state->num_failed++;
/*
* If a node failed to complete the update_record control,
* then either a recovery is already running or something
* bad is going on. So trigger a recovery and let the
* recovery finish the transaction, sending back the reply
* for the trans3_commit control to the client.
*/
ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
return;
}
state->num_pending--;
if (state->num_pending != 0) {
return;
}
ctdb_request_control_reply(state->ctdb, state->c, NULL, 0, state->errormsg);
talloc_free(state);
}
/*
called if persistent store times out
*/
static void ctdb_persistent_store_timeout(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *private_data)
{
struct ctdb_persistent_state *state = talloc_get_type(private_data, struct ctdb_persistent_state);
if (state->ctdb->recovery_mode != CTDB_RECOVERY_NORMAL) {
DEBUG(DEBUG_INFO, ("ctdb_persistent_store_timeout: ignoring "
"timeout during recovery\n"));
return;
}
ctdb_request_control_reply(state->ctdb, state->c, NULL, 1,
"timeout in ctdb_persistent_state");
talloc_free(state);
}
/**
* Finish pending trans3 commit controls, i.e. send
* reply to the client. This is called by the end-recovery
* control to fix the situation when a recovery interrupts
* the usual progress of a transaction.
*/
void ctdb_persistent_finish_trans3_commits(struct ctdb_context *ctdb)
{
struct ctdb_db_context *ctdb_db;
if (ctdb->recovery_mode != CTDB_RECOVERY_NORMAL) {
DEBUG(DEBUG_INFO, ("ctdb_persistent_finish_trans3_commits: "
"skipping execution when recovery is "
"active\n"));
return;
}
for (ctdb_db = ctdb->db_list; ctdb_db; ctdb_db = ctdb_db->next) {
struct ctdb_persistent_state *state;
if (ctdb_db->persistent_state == NULL) {
continue;
}
state = ctdb_db->persistent_state;
ctdb_request_control_reply(ctdb, state->c, NULL, 2,
"trans3 commit ended by recovery");
/* The destructor sets ctdb_db->persistent_state to NULL. */
talloc_free(state);
}
}
static int ctdb_persistent_state_destructor(struct ctdb_persistent_state *state)
{
if (state->client != NULL) {
state->client->db_id = 0;
}
if (state->ctdb_db != NULL) {
state->ctdb_db->persistent_state = NULL;
}
return 0;
}
/*
* Store a set of persistent records.
* This is used to roll out a transaction to all nodes.
*/
int32_t ctdb_control_trans3_commit(struct ctdb_context *ctdb,
struct ctdb_req_control_old *c,
TDB_DATA recdata, bool *async_reply)
{
struct ctdb_client *client;
struct ctdb_persistent_state *state;
unsigned int i;
struct ctdb_marshall_buffer *m = (struct ctdb_marshall_buffer *)recdata.dptr;
struct ctdb_db_context *ctdb_db;
if (ctdb->recovery_mode != CTDB_RECOVERY_NORMAL) {
DEBUG(DEBUG_INFO,("rejecting ctdb_control_trans3_commit when recovery active\n"));
return -1;
}
client = reqid_find(ctdb->idr, c->client_id, struct ctdb_client);
if (client == NULL) {
DEBUG(DEBUG_ERR,(__location__ " can not match persistent_store "
"to a client. Returning error\n"));
return -1;
}
if (client->db_id != 0) {
DEBUG(DEBUG_ERR,(__location__ " ERROR: trans3_commit: "
"client-db_id[0x%08x] != 0 "
"(client_id[0x%08x]): trans3_commit active?\n",
client->db_id, client->client_id));
return -1;
}
ctdb_db = find_ctdb_db(ctdb, m->db_id);
if (ctdb_db == NULL) {
DEBUG(DEBUG_ERR,(__location__ " ctdb_control_trans3_commit: "
"Unknown database db_id[0x%08x]\n", m->db_id));
return -1;
}
if (ctdb_db->persistent_state != NULL) {
DEBUG(DEBUG_ERR, (__location__ " Error: "
"ctdb_control_trans3_commit "
"called while a transaction commit is "
"active. db_id[0x%08x]\n", m->db_id));
return -1;
}
ctdb_db->persistent_state = talloc_zero(ctdb_db,
struct ctdb_persistent_state);
CTDB_NO_MEMORY(ctdb, ctdb_db->persistent_state);
client->db_id = m->db_id;
state = ctdb_db->persistent_state;
state->ctdb = ctdb;
state->ctdb_db = ctdb_db;
state->c = c;
state->client = client;
talloc_set_destructor(state, ctdb_persistent_state_destructor);
for (i = 0; i < ctdb->vnn_map->size; i++) {
struct ctdb_node *node = ctdb->nodes[ctdb->vnn_map->map[i]];
int ret;
/* only send to active nodes */
if (node->flags & NODE_FLAGS_INACTIVE) {
continue;
}
ret = ctdb_daemon_send_control(ctdb, node->pnn, 0,
CTDB_CONTROL_UPDATE_RECORD,
c->client_id, 0, recdata,
ctdb_persistent_callback,
state);
if (ret == -1) {
DEBUG(DEBUG_ERR,("Unable to send "
"CTDB_CONTROL_UPDATE_RECORD "
"to pnn %u\n", node->pnn));
talloc_free(state);
return -1;
}
state->num_pending++;
state->num_sent++;
}
if (state->num_pending == 0) {
talloc_free(state);
return 0;
}
/* we need to wait for the replies */
*async_reply = true;
/* need to keep the control structure around */
talloc_steal(state, c);
/* but we won't wait forever */
tevent_add_timer(ctdb->ev, state,
timeval_current_ofs(ctdb->tunable.control_timeout, 0),
ctdb_persistent_store_timeout, state);
return 0;
}
/*
backwards compatibility:
start a persistent store operation. passing both the key, header and
data to the daemon. If the client disconnects before it has issued
a persistent_update call to the daemon we trigger a full recovery
to ensure the databases are brought back in sync.
for now we ignore the recdata that the client has passed to us.
*/
int32_t ctdb_control_start_persistent_update(struct ctdb_context *ctdb,
struct ctdb_req_control_old *c,
TDB_DATA recdata)
{
struct ctdb_client *client = reqid_find(ctdb->idr, c->client_id, struct ctdb_client);
if (client == NULL) {
DEBUG(DEBUG_ERR,(__location__ " can not match start_persistent_update to a client. Returning error\n"));
return -1;
}
client->num_persistent_updates++;
return 0;
}
/*
backwards compatibility:
called to tell ctdbd that it is no longer doing a persistent update
*/
int32_t ctdb_control_cancel_persistent_update(struct ctdb_context *ctdb,
struct ctdb_req_control_old *c,
TDB_DATA recdata)
{
struct ctdb_client *client = reqid_find(ctdb->idr, c->client_id, struct ctdb_client);
if (client == NULL) {
DEBUG(DEBUG_ERR,(__location__ " can not match cancel_persistent_update to a client. Returning error\n"));
return -1;
}
if (client->num_persistent_updates > 0) {
client->num_persistent_updates--;
}
return 0;
}
static int32_t ctdb_get_db_seqnum(struct ctdb_context *ctdb,
uint32_t db_id,
uint64_t *seqnum)
{
int32_t ret;
struct ctdb_db_context *ctdb_db;
const char *keyname = CTDB_DB_SEQNUM_KEY;
TDB_DATA key;
TDB_DATA data;
TALLOC_CTX *mem_ctx = talloc_new(ctdb);
struct ctdb_ltdb_header header;
ctdb_db = find_ctdb_db(ctdb, db_id);
if (!ctdb_db) {
DEBUG(DEBUG_ERR,(__location__ " Unknown db 0x%08x\n", db_id));
ret = -1;
goto done;
}
if (! ctdb_db_allow_access(ctdb_db)) {
ret = -1;
goto done;
}
key.dptr = (uint8_t *)discard_const(keyname);
key.dsize = strlen(keyname) + 1;
ret = (int32_t)ctdb_ltdb_fetch(ctdb_db, key, &header, mem_ctx, &data);
if (ret != 0) {
goto done;
}
if (data.dsize != sizeof(uint64_t)) {
*seqnum = 0;
goto done;
}
*seqnum = *(uint64_t *)data.dptr;
done:
talloc_free(mem_ctx);
return ret;
}
/**
* Get the sequence number of a persistent database.
*/
int32_t ctdb_control_get_db_seqnum(struct ctdb_context *ctdb,
TDB_DATA indata,
TDB_DATA *outdata)
{
uint32_t db_id;
int32_t ret;
uint64_t seqnum;
db_id = *(uint32_t *)indata.dptr;
ret = ctdb_get_db_seqnum(ctdb, db_id, &seqnum);
if (ret != 0) {
goto done;
}
outdata->dsize = sizeof(uint64_t);
outdata->dptr = talloc_memdup(outdata, &seqnum, sizeof(uint64_t));
if (outdata->dptr == NULL) {
ret = -1;
}
done:
return ret;
}
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