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diff --git a/src/sbd-pacemaker.c b/src/sbd-pacemaker.c
index 5f2dea6..772b265 100644
--- a/src/sbd-pacemaker.c
+++ b/src/sbd-pacemaker.c
@@ -1,617 +1,620 @@
/*
* Copyright (C) 2013 Lars Marowsky-Bree <lmb@suse.com>
*
* Based on crm_mon.c, which was:
* Copyright (C) 2004 Andrew Beekhof <andrew@beekhof.net>
*
* 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 2 of the License, or (at your option) any later version.
*
* This software 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* TODO list:
*
* - Trying to shutdown a node if no devices are up will fail, since SBD
* currently uses a message via the disk to achieve this.
*
* - Shutting down cluster nodes while the majority of devices is down
* will eventually take the cluster below the quorum threshold, at which
* time the remaining cluster nodes will all immediately suicide.
*
*/
#include "sbd.h"
#include <sys/param.h>
#include <crm/crm.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <sys/utsname.h>
#include <config.h>
#include <crm_config.h>
#include <crm/msg_xml.h>
#include <crm/common/util.h>
#include <crm/common/xml.h>
#include <crm/common/ipc.h>
#include <crm/common/mainloop.h>
#ifdef SUPPORT_PLUGIN
# include <crm/cluster.h>
#endif
#include <crm/cib.h>
#include <crm/pengine/status.h>
enum pcmk_health
{
pcmk_health_unknown,
pcmk_health_pending,
pcmk_health_transient,
pcmk_health_unclean,
pcmk_health_shutdown,
pcmk_health_online,
pcmk_health_noquorum,
};
extern int servant_count;
static void clean_up(int rc);
static void crm_diff_update(const char *event, xmlNode * msg);
static int cib_connect(gboolean full);
static void set_pcmk_health(enum pcmk_health healthy);
static void notify_parent(void);
static void compute_status(pe_working_set_t * data_set);
static gboolean mon_refresh_state(gpointer user_data);
static GMainLoop *mainloop = NULL;
static guint timer_id_reconnect = 0;
static guint timer_id_notify = 0;
static int reconnect_msec = 1000;
static enum pcmk_health pcmk_healthy = 0;
static int cib_connected = 0;
#ifdef SUPPORT_PLUGIN
static guint timer_id_ais = 0;
static enum cluster_type_e cluster_stack = pcmk_cluster_unknown;
static struct timespec t_last_quorum;
static int check_ais = 0;
#endif
#define LOGONCE(state, lvl, fmt, args...) do { \
if (last_state != state) { \
cl_log(lvl, fmt, ##args); \
last_state = state; \
} \
healthy = state; \
} while(0)
static cib_t *cib = NULL;
static xmlNode *current_cib = NULL;
static long last_refresh = 0;
static gboolean
mon_timer_reconnect(gpointer data)
{
int rc = 0;
if (timer_id_reconnect > 0) {
g_source_remove(timer_id_reconnect);
}
rc = cib_connect(TRUE);
if (rc != 0) {
cl_log(LOG_WARNING, "CIB reconnect failed: %d", rc);
timer_id_reconnect = g_timeout_add(reconnect_msec, mon_timer_reconnect, NULL);
} else {
cl_log(LOG_INFO, "CIB reconnect successful");
}
return FALSE;
}
static void
mon_cib_connection_destroy(gpointer user_data)
{
if (cib) {
cl_log(LOG_WARNING, "Disconnected from CIB");
cib->cmds->signoff(cib);
set_pcmk_health(pcmk_health_transient);
timer_id_reconnect = g_timeout_add(reconnect_msec, mon_timer_reconnect, NULL);
}
cib_connected = 0;
return;
}
static gboolean
mon_timer_notify(gpointer data)
{
static int counter = 0;
int counter_max = timeout_watchdog / timeout_loop;
if (timer_id_notify > 0) {
g_source_remove(timer_id_notify);
}
if (cib_connected) {
if (counter == counter_max) {
free_xml(current_cib);
current_cib = get_cib_copy(cib);
mon_refresh_state(NULL);
counter = 0;
} else {
cib->cmds->noop(cib, 0);
notify_parent();
counter++;
}
}
timer_id_notify = g_timeout_add(timeout_loop * 1000, mon_timer_notify, NULL);
return FALSE;
}
/*
* Mainloop signal handler.
*/
static void
mon_shutdown(int nsig)
{
clean_up(0);
}
static int
cib_connect(gboolean full)
{
int rc = 0;
CRM_CHECK(cib != NULL, return -EINVAL);
cib_connected = 0;
crm_xml_init();
if (cib->state != cib_connected_query && cib->state != cib_connected_command) {
rc = cib->cmds->signon(cib, crm_system_name, cib_query);
if (rc != 0) {
return rc;
}
current_cib = get_cib_copy(cib);
mon_refresh_state(NULL);
if (full) {
if (rc == 0) {
rc = cib->cmds->set_connection_dnotify(cib, mon_cib_connection_destroy);
if (rc == -EPROTONOSUPPORT) {
/* Notification setup failed, won't be able to reconnect after failure */
rc = 0;
}
}
if (rc == 0) {
cib->cmds->del_notify_callback(cib, T_CIB_DIFF_NOTIFY, crm_diff_update);
rc = cib->cmds->add_notify_callback(cib, T_CIB_DIFF_NOTIFY, crm_diff_update);
}
if (rc != 0) {
/* Notification setup failed, could not monitor CIB actions */
clean_up(-rc);
}
}
}
if (!rc) {
cib_connected = 1;
}
return rc;
}
#ifdef SUPPORT_PLUGIN
static gboolean
mon_timer_ais(gpointer data)
{
if (timer_id_ais > 0) {
g_source_remove(timer_id_ais);
}
send_cluster_text(crm_class_quorum, NULL, TRUE, NULL, crm_msg_ais);
/* The timer is set in the response processing */
return FALSE;
}
static void
ais_membership_destroy(gpointer user_data)
{
cl_log(LOG_ERR, "AIS connection terminated - corosync down?");
#if SUPPORT_PLUGIN
ais_fd_sync = -1;
#endif
/* TODO: Is recovery even worth it here? After all, this means
* that corosync died ... */
exit(1);
}
static void
ais_membership_dispatch(cpg_handle_t handle,
const struct cpg_name *groupName,
uint32_t nodeid, uint32_t pid, void *msg, size_t msg_len)
{
uint32_t kind = 0;
const char *from = NULL;
char *data = pcmk_message_common_cs(handle, nodeid, pid, msg, &kind, &from);
if (!data) {
return;
}
free(data);
data = NULL;
if (kind != crm_class_quorum) {
return;
}
DBGLOG(LOG_INFO, "AIS quorum state: %d", (int)crm_have_quorum);
clock_gettime(CLOCK_MONOTONIC, &t_last_quorum);
timer_id_ais = g_timeout_add(timeout_loop * 1000, mon_timer_ais, NULL);
return;
}
#endif
static void
compute_status(pe_working_set_t * data_set)
{
static int updates = 0;
static int last_state = 0;
static int ever_had_quorum = FALSE;
int healthy = 0;
struct timespec t_now;
node_t *node = pe_find_node(data_set->nodes, local_uname);
updates++;
clock_gettime(CLOCK_MONOTONIC, &t_now);
if (data_set->dc_node == NULL) {
LOGONCE(pcmk_health_transient, LOG_INFO, "We don't have a DC right now.");
goto out;
}
- if (node == NULL || node->details->online == FALSE) {
+ if (node == NULL) {
LOGONCE(pcmk_health_unknown, LOG_WARNING, "Node state: UNKNOWN");
+ } else if (node->details->online == FALSE) {
+ LOGONCE(pcmk_health_unknown, LOG_WARNING, "Node state: OFFLINE");
+
} else if (node->details->unclean) {
LOGONCE(pcmk_health_unclean, LOG_WARNING, "Node state: UNCLEAN");
} else if (node->details->pending) {
LOGONCE(pcmk_health_pending, LOG_WARNING, "Node state: pending");
#if 0
} else if (node->details->shutdown) {
LOGONCE(pcmk_health_shutdown, LOG_WARNING, "Node state: shutting down");
#endif
} else {
if (data_set->flags & pe_flag_have_quorum) {
LOGONCE(pcmk_health_online, LOG_INFO, "Node state: online");
ever_had_quorum = TRUE;
} else if(servant_count > 0) {
LOGONCE(pcmk_health_noquorum, LOG_WARNING, "Quorum lost");
goto out;
} else if(ever_had_quorum == FALSE) {
LOGONCE(pcmk_health_online, LOG_INFO, "We do not have quorum yet");
} else {
/* We lost quorum, and there are no disks present
* Setting healthy > 2 here will result in us self-fencing
*/
switch (data_set->no_quorum_policy) {
case no_quorum_freeze:
LOGONCE(pcmk_health_transient, LOG_INFO, "Quorum lost: Freeze resources");
break;
case no_quorum_stop:
LOGONCE(pcmk_health_transient, LOG_INFO, "Quorum lost: Stop ALL resources");
break;
case no_quorum_ignore:
LOGONCE(pcmk_health_transient, LOG_INFO, "Quorum lost: Ignore");
break;
case no_quorum_suicide:
LOGONCE(pcmk_health_unclean, LOG_INFO, "Quorum lost: Self-fence");
break;
}
}
}
#ifdef SUPPORT_PLUGIN
if (check_ais) {
int quorum_age = t_now.tv_sec - t_last_quorum.tv_sec;
if (quorum_age > (int)(timeout_io+timeout_loop)) {
if (t_last_quorum.tv_sec != 0)
LOGONCE(pcmk_health_transient, LOG_WARNING, "AIS: Quorum outdated");
} else if (crm_have_quorum) {
LOGONCE(pcmk_health_online, LOG_INFO, "AIS: We have quorum");
} else {
LOGONCE(pcmk_health_unclean, LOG_WARNING, "AIS: We do NOT have quorum");
}
}
#endif
out:
set_pcmk_health(healthy);
return;
}
static void
set_pcmk_health(enum pcmk_health healthy)
{
pcmk_healthy = healthy;
notify_parent();
}
static void
notify_parent(void)
{
pid_t ppid;
union sigval signal_value;
memset(&signal_value, 0, sizeof(signal_value));
ppid = getppid();
if (ppid == 1) {
/* Our parent died unexpectedly. Triggering
* self-fence. */
cl_log(LOG_WARNING, "Our parent is dead.");
do_reset();
}
switch (pcmk_healthy) {
case pcmk_health_pending:
case pcmk_health_shutdown:
case pcmk_health_transient:
DBGLOG(LOG_INFO, "Not notifying parent: state transient (%d)", pcmk_healthy);
break;
case pcmk_health_unknown:
case pcmk_health_unclean:
case pcmk_health_noquorum:
DBGLOG(LOG_WARNING, "Notifying parent: UNHEALTHY (%d)", pcmk_healthy);
sigqueue(ppid, SIG_PCMK_UNHEALTHY, signal_value);
break;
case pcmk_health_online:
DBGLOG(LOG_INFO, "Notifying parent: healthy");
sigqueue(ppid, SIG_LIVENESS, signal_value);
break;
default:
DBGLOG(LOG_WARNING, "Notifying parent: UNHEALTHY %d", pcmk_healthy);
sigqueue(ppid, SIG_PCMK_UNHEALTHY, signal_value);
break;
}
}
static crm_trigger_t *refresh_trigger = NULL;
static gboolean
mon_trigger_refresh(gpointer user_data)
{
mainloop_set_trigger(refresh_trigger);
mon_refresh_state(NULL);
return FALSE;
}
static void
crm_diff_update(const char *event, xmlNode * msg)
{
int rc = -1;
const char *op = NULL;
long now = time(NULL);
static int updates = 0;
static mainloop_timer_t *refresh_timer = NULL;
if(refresh_timer == NULL) {
refresh_timer = mainloop_timer_add("refresh", 2000, FALSE, mon_trigger_refresh, NULL);
refresh_trigger = mainloop_add_trigger(G_PRIORITY_LOW, mon_refresh_state, refresh_timer);
}
if (current_cib != NULL) {
xmlNode *cib_last = current_cib;
current_cib = NULL;
rc = cib_apply_patch_event(msg, cib_last, &current_cib, LOG_DEBUG);
free_xml(cib_last);
switch(rc) {
case -pcmk_err_diff_resync:
case -pcmk_err_diff_failed:
crm_warn("[%s] %s Patch aborted: %s (%d)", event, op, pcmk_strerror(rc), rc);
break;
case pcmk_ok:
updates++;
break;
default:
crm_notice("[%s] %s ABORTED: %s (%d)", event, op, pcmk_strerror(rc), rc);
break;
}
}
if (current_cib == NULL) {
current_cib = get_cib_copy(cib);
}
/* Refresh
* - immediately if the last update was more than 5s ago
* - every 10 updates
* - at most 2s after the last update
*/
if (updates > 10 || (now - last_refresh) > (reconnect_msec / 1000)) {
mon_refresh_state(refresh_timer);
updates = 0;
} else {
mainloop_set_trigger(refresh_trigger);
mainloop_timer_start(refresh_timer);
}
}
static gboolean
mon_refresh_state(gpointer user_data)
{
xmlNode *cib_copy = NULL;
pe_working_set_t data_set;
if(current_cib == NULL) {
return FALSE;
}
if(user_data) {
mainloop_timer_t *timer = user_data;
mainloop_timer_stop(timer);
}
cib_copy = copy_xml(current_cib);
if (cli_config_update(&cib_copy, NULL, FALSE) == FALSE) {
cl_log(LOG_WARNING, "cli_config_update() failed - forcing reconnect to CIB");
if (cib) {
cib->cmds->signoff(cib);
}
} else {
last_refresh = time(NULL);
set_working_set_defaults(&data_set);
data_set.input = cib_copy;
data_set.flags |= pe_flag_have_stonith_resource;
cluster_status(&data_set);
compute_status(&data_set);
cleanup_calculations(&data_set);
}
return FALSE;
}
static void
clean_up(int rc)
{
if (cib != NULL) {
cib->cmds->signoff(cib);
cib_delete(cib);
cib = NULL;
}
if (rc >= 0) {
exit(rc);
}
return;
}
int
servant_pcmk(const char *diskname, int mode, const void* argp)
{
int exit_code = 0;
crm_cluster_t crm_cluster;
cl_log(LOG_INFO, "Monitoring Pacemaker health");
set_proc_title("sbd: watcher: Pacemaker");
setenv("PCMK_watchdog", "true", 1);
if(debug == 0) {
/* We don't want any noisy crm messages */
set_crm_log_level(LOG_CRIT);
}
#ifdef SUPPORT_PLUGIN
cluster_stack = get_cluster_type();
if (cluster_stack != pcmk_cluster_classic_ais) {
check_ais = 0;
} else {
check_ais = 1;
cl_log(LOG_INFO, "Legacy plug-in detected, AIS quorum check enabled");
if(is_openais_cluster()) {
crm_cluster.destroy = ais_membership_destroy;
crm_cluster.cpg.cpg_deliver_fn = ais_membership_dispatch;
/* crm_cluster.cpg.cpg_confchg_fn = pcmk_cpg_membership; TODO? */
crm_cluster.cpg.cpg_confchg_fn = NULL;
}
while (!crm_cluster_connect(&crm_cluster)) {
cl_log(LOG_INFO, "Waiting to sign in with cluster ...");
sleep(reconnect_msec / 1000);
}
}
#endif
if (current_cib == NULL) {
cib = cib_new();
do {
exit_code = cib_connect(TRUE);
if (exit_code != 0) {
sleep(reconnect_msec / 1000);
}
} while (exit_code == -ENOTCONN);
if (exit_code != 0) {
clean_up(-exit_code);
}
}
mainloop = g_main_new(FALSE);
mainloop_add_signal(SIGTERM, mon_shutdown);
mainloop_add_signal(SIGINT, mon_shutdown);
timer_id_notify = g_timeout_add(timeout_loop * 1000, mon_timer_notify, NULL);
#ifdef SUPPORT_PLUGIN
if (check_ais) {
timer_id_ais = g_timeout_add(timeout_loop * 1000, mon_timer_ais, NULL);
}
#endif
g_main_run(mainloop);
g_main_destroy(mainloop);
clean_up(0);
return 0; /* never reached */
}

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