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/*
ctdb banning code
Copyright (C) Ronnie Sahlberg 2009
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 "includes.h"
#include "tdb.h"
#include "system/time.h"
#include "system/network.h"
#include "system/filesys.h"
#include "system/wait.h"
#include "../include/ctdb_client.h"
#include "../include/ctdb_private.h"
static void ctdb_ban_node_event(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *private_data)
{
struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
/* Make sure we were able to freeze databases during banning */
if (!ctdb_db_all_frozen(ctdb)) {
DEBUG(DEBUG_ERR, ("Banning timedout, but still unable to freeze databases\n"));
ctdb_ban_self(ctdb);
return;
}
DEBUG(DEBUG_ERR,("Banning timedout\n"));
ctdb->nodes[ctdb->pnn]->flags &= ~NODE_FLAGS_BANNED;
if (ctdb->banning_ctx != NULL) {
talloc_free(ctdb->banning_ctx);
ctdb->banning_ctx = NULL;
}
}
void ctdb_local_node_got_banned(struct ctdb_context *ctdb)
{
struct ctdb_db_context *ctdb_db;
DEBUG(DEBUG_NOTICE,("This node has been banned - forcing recovery\n"));
/* Reset the generation id to 1 to make us ignore any
REQ/REPLY CALL/DMASTER someone sends to us.
We are now banned so we shouldnt service database calls
anymore.
*/
ctdb->vnn_map->generation = INVALID_GENERATION;
for (ctdb_db = ctdb->db_list; ctdb_db != NULL; ctdb_db = ctdb_db->next) {
ctdb_db->generation = INVALID_GENERATION;
}
/* make sure we get frozen */
ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
ctdb_release_all_ips(ctdb);
}
int32_t ctdb_control_set_ban_state(struct ctdb_context *ctdb, TDB_DATA indata)
{
struct ctdb_ban_time *bantime = (struct ctdb_ban_time *)indata.dptr;
bool already_banned;
DEBUG(DEBUG_INFO,("SET BAN STATE\n"));
if (bantime->pnn != ctdb->pnn) {
if (bantime->pnn >= ctdb->num_nodes) {
DEBUG(DEBUG_ERR,(__location__ " ERROR: Invalid ban request. PNN:%d is invalid. Max nodes %d\n", bantime->pnn, ctdb->num_nodes));
return -1;
}
if (bantime->time == 0) {
DEBUG(DEBUG_NOTICE,("unbanning node %d\n", bantime->pnn));
ctdb->nodes[bantime->pnn]->flags &= ~NODE_FLAGS_BANNED;
} else {
DEBUG(DEBUG_NOTICE,("banning node %d\n", bantime->pnn));
if (ctdb->tunable.enable_bans == 0) {
/* FIXME: This is bogus. We really should be
* taking decision based on the tunables on
* the banned node and not local node.
*/
DEBUG(DEBUG_WARNING,("Bans are disabled - ignoring ban of node %u\n", bantime->pnn));
return 0;
}
ctdb->nodes[bantime->pnn]->flags |= NODE_FLAGS_BANNED;
}
return 0;
}
already_banned = false;
if (ctdb->banning_ctx != NULL) {
talloc_free(ctdb->banning_ctx);
ctdb->banning_ctx = NULL;
already_banned = true;
}
if (bantime->time == 0) {
DEBUG(DEBUG_ERR,("Unbanning this node\n"));
ctdb->nodes[bantime->pnn]->flags &= ~NODE_FLAGS_BANNED;
return 0;
}
if (ctdb->tunable.enable_bans == 0) {
DEBUG(DEBUG_ERR,("Bans are disabled - ignoring ban of node %u\n", bantime->pnn));
return 0;
}
ctdb->banning_ctx = talloc(ctdb, struct ctdb_ban_time);
if (ctdb->banning_ctx == NULL) {
DEBUG(DEBUG_CRIT,(__location__ " ERROR Failed to allocate new banning state\n"));
return -1;
}
*((struct ctdb_ban_time *)(ctdb->banning_ctx)) = *bantime;
DEBUG(DEBUG_ERR,("Banning this node for %d seconds\n", bantime->time));
ctdb->nodes[bantime->pnn]->flags |= NODE_FLAGS_BANNED;
tevent_add_timer(ctdb->ev, ctdb->banning_ctx,
timeval_current_ofs(bantime->time,0),
ctdb_ban_node_event, ctdb);
if (!already_banned) {
ctdb_local_node_got_banned(ctdb);
}
return 0;
}
int32_t ctdb_control_get_ban_state(struct ctdb_context *ctdb, TDB_DATA *outdata)
{
struct ctdb_ban_time *bantime;
bantime = talloc(outdata, struct ctdb_ban_time);
CTDB_NO_MEMORY(ctdb, bantime);
if (ctdb->banning_ctx != NULL) {
*bantime = *(struct ctdb_ban_time *)(ctdb->banning_ctx);
} else {
bantime->pnn = ctdb->pnn;
bantime->time = 0;
}
outdata->dptr = (uint8_t *)bantime;
outdata->dsize = sizeof(struct ctdb_ban_time);
return 0;
}
/* Routine to ban ourselves for a while when trouble strikes. */
void ctdb_ban_self(struct ctdb_context *ctdb)
{
TDB_DATA data;
struct ctdb_ban_time bantime;
bantime.pnn = ctdb->pnn;
bantime.time = ctdb->tunable.recovery_ban_period;
data.dsize = sizeof(bantime);
data.dptr = (uint8_t *)&bantime;
ctdb_control_set_ban_state(ctdb, data);
}
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