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diff --git a/src/sbd-md.c b/src/sbd-md.c
index 028bda2..6395529 100644
--- a/src/sbd-md.c
+++ b/src/sbd-md.c
@@ -1,1087 +1,1124 @@
/*
* Copyright (C) 2013 Lars Marowsky-Bree <lmb@suse.com>
*
* 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 2.1 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "sbd.h"
struct servants_list_item *servants_leader = NULL;
static int servant_count = 0;
static int servant_restart_interval = 5;
static int servant_restart_count = 1;
static int servant_inform_parent = 0;
static int check_pcmk = 0;
static int start_mode = 0;
static char* pidfile = NULL;
int quorum_write(int good_servants)
{
return (good_servants > servant_count/2);
}
int quorum_read(int good_servants)
{
if (servant_count >= 3)
return (good_servants > servant_count/2);
else
return (good_servants >= 1);
}
int assign_servant(const char* devname, functionp_t functionp, const void* argp)
{
pid_t pid = 0;
int rc = 0;
pid = fork();
if (pid == 0) { /* child */
maximize_priority();
rc = (*functionp)(devname, argp);
if (rc == -1)
exit(1);
else
exit(0);
} else if (pid != -1) { /* parent */
return pid;
} else {
cl_log(LOG_ERR,"Failed to fork servant");
exit(1);
}
}
int init_devices()
{
int rc = 0;
struct sbd_context *st;
struct servants_list_item *s;
for (s = servants_leader; s; s = s->next) {
fprintf(stdout, "Initializing device %s\n",
s->devname);
st = open_device(s->devname);
if (!st) {
return -1;
}
rc = init_device(st);
close_device(st);
if (rc == -1) {
fprintf(stderr, "Failed to init device %s\n", s->devname);
return rc;
}
fprintf(stdout, "Device %s is initialized.\n", s->devname);
}
return 0;
}
int slot_msg_wrapper(const char* devname, const void* argp)
{
int rc = 0;
struct sbd_context *st;
const struct slot_msg_arg_t* arg = (const struct slot_msg_arg_t*)argp;
st = open_device(devname);
if (!st)
return -1;
cl_log(LOG_INFO, "Delivery process handling %s",
devname);
rc = slot_msg(st, arg->name, arg->msg);
close_device(st);
return rc;
}
int slot_ping_wrapper(const char* devname, const void* argp)
{
int rc = 0;
const char* name = (const char*)argp;
struct sbd_context *st;
st = open_device(devname);
if (!st)
return -1;
rc = slot_ping(st, name);
close_device(st);
return rc;
}
int allocate_slots(const char *name)
{
int rc = 0;
struct sbd_context *st;
struct servants_list_item *s;
for (s = servants_leader; s; s = s->next) {
fprintf(stdout, "Trying to allocate slot for %s on device %s.\n",
name,
s->devname);
st = open_device(s->devname);
if (!st) {
return -1;
}
rc = slot_allocate(st, name);
close_device(st);
if (rc < 0)
return rc;
fprintf(stdout, "Slot for %s has been allocated on %s.\n",
name,
s->devname);
}
return 0;
}
int list_slots()
{
int rc = 0;
struct servants_list_item *s;
struct sbd_context *st;
for (s = servants_leader; s; s = s->next) {
st = open_device(s->devname);
if (!st) {
fprintf(stdout, "== disk %s unreadable!\n", s->devname);
continue;
}
rc = slot_list(st);
close_device(st);
if (rc == -1) {
fprintf(stdout, "== Slots on disk %s NOT dumped\n", s->devname);
}
}
return 0;
}
int ping_via_slots(const char *name)
{
int sig = 0;
pid_t pid = 0;
int status = 0;
int servants_finished = 0;
sigset_t procmask;
siginfo_t sinfo;
struct servants_list_item *s;
sigemptyset(&procmask);
sigaddset(&procmask, SIGCHLD);
sigprocmask(SIG_BLOCK, &procmask, NULL);
for (s = servants_leader; s; s = s->next) {
s->pid = assign_servant(s->devname, &slot_ping_wrapper, (const void*)name);
}
while (servants_finished < servant_count) {
sig = sigwaitinfo(&procmask, &sinfo);
if (sig == SIGCHLD) {
while ((pid = wait(&status))) {
if (pid == -1 && errno == ECHILD) {
break;
} else {
s = lookup_servant_by_pid(pid);
if (s) {
servants_finished++;
}
}
}
}
}
return 0;
}
/* This is a bit hackish, but the easiest way to rewire all process
* exits to send the desired signal to the parent. */
void servant_exit(void)
{
pid_t ppid;
union sigval signal_value;
ppid = getppid();
if (servant_inform_parent) {
memset(&signal_value, 0, sizeof(signal_value));
sigqueue(ppid, SIG_IO_FAIL, signal_value);
}
}
int servant(const char *diskname, const void* argp)
{
struct sector_mbox_s *s_mbox = NULL;
+ struct sector_node_s *s_node = NULL;
struct sector_header_s *s_header = NULL;
int mbox;
int rc = 0;
time_t t0, t1, latency;
union sigval signal_value;
sigset_t servant_masks;
struct sbd_context *st;
pid_t ppid;
char uuid[37];
const struct servants_list_item *s = argp;
if (!diskname) {
cl_log(LOG_ERR, "Empty disk name %s.", diskname);
return -1;
}
cl_log(LOG_INFO, "Servant starting for device %s", diskname);
/* Block most of the signals */
sigfillset(&servant_masks);
sigdelset(&servant_masks, SIGKILL);
sigdelset(&servant_masks, SIGFPE);
sigdelset(&servant_masks, SIGILL);
sigdelset(&servant_masks, SIGSEGV);
sigdelset(&servant_masks, SIGBUS);
sigdelset(&servant_masks, SIGALRM);
/* FIXME: check error */
sigprocmask(SIG_SETMASK, &servant_masks, NULL);
atexit(servant_exit);
servant_inform_parent = 1;
st = open_device(diskname);
if (!st) {
return -1;
}
s_header = header_get(st);
if (!s_header) {
cl_log(LOG_ERR, "Not a valid header on %s", diskname);
return -1;
}
if (s_header->minor_version > 0) {
uuid_unparse_lower(s_header->uuid, uuid);
cl_log(LOG_INFO, "Device %s uuid: %s", diskname, uuid);
}
mbox = slot_allocate(st, local_uname);
if (mbox < 0) {
cl_log(LOG_ERR,
"No slot allocated, and automatic allocation failed for disk %s.",
diskname);
rc = -1;
goto out;
}
+ s_node = sector_alloc();
+ if (slot_read(st, mbox, s_node) < 0) {
+ cl_log(LOG_ERR, "Unable to read node entry on %s",
+ diskname);
+ exit(1);
+ }
+
DBGLOG(LOG_INFO, "Monitoring slot %d on disk %s", mbox, diskname);
if (s_header->minor_version == 0) {
set_proc_title("sbd: watcher: %s - slot: %d", diskname, mbox);
} else {
set_proc_title("sbd: watcher: %s - slot: %d - uuid: %s",
diskname, mbox, uuid);
}
s_mbox = sector_alloc();
if (s->first_start) {
if (start_mode > 0) {
if (mbox_read(st, mbox, s_mbox) < 0) {
cl_log(LOG_ERR, "mbox read failed during start-up in servant.");
rc = -1;
goto out;
}
if (s_mbox->cmd != SBD_MSG_EXIT &&
s_mbox->cmd != SBD_MSG_EMPTY) {
/* Not a clean stop. Abort start-up */
cl_log(LOG_WARNING, "Found fencing message - aborting start-up. Manual intervention required!");
ppid = getppid();
sigqueue(ppid, SIG_EXITREQ, signal_value);
rc = 0;
goto out;
}
}
DBGLOG(LOG_INFO, "First servant start - zeroing inbox");
memset(s_mbox, 0, sizeof(*s_mbox));
if (mbox_write(st, mbox, s_mbox) < 0) {
rc = -1;
goto out;
}
}
memset(&signal_value, 0, sizeof(signal_value));
while (1) {
+ struct sector_header_s *s_header_retry = NULL;
+ struct sector_header_s *s_node_retry = NULL;
+
t0 = time(NULL);
sleep(timeout_loop);
ppid = getppid();
if (ppid == 1) {
/* Our parent died unexpectedly. Triggering
* self-fence. */
do_reset();
}
+ /* These attempts are, by definition, somewhat racy. If
+ * the device is wiped out or corrupted between here and
+ * us reading our mbox, there is nothing we can do about
+ * that. But at least we tried. */
+ s_header_retry = header_get(st);
+ if (!s_header_retry) {
+ cl_log(LOG_ERR, "No longer found a valid header on %s", diskname);
+ exit(1);
+ }
+ if (memcmp(s_header, s_header_retry, sizeof(*s_header)) != 0) {
+ cl_log(LOG_ERR, "Header on %s changed since start-up!", diskname);
+ exit(1);
+ }
+ free(s_header_retry);
+
+ s_node_retry = sector_alloc();
+ if (slot_read(st, mbox, s_node_retry) < 0) {
+ cl_log(LOG_ERR, "slot read failed in servant.");
+ exit(1);
+ }
+ if (memcmp(s_node, s_node_retry, sizeof(*s_node)) != 0) {
+ cl_log(LOG_ERR, "Node entry on %s changed since start-up!", diskname);
+ exit(1);
+ }
+ free(s_node_retry);
+
if (mbox_read(st, mbox, s_mbox) < 0) {
cl_log(LOG_ERR, "mbox read failed in servant.");
exit(1);
}
if (s_mbox->cmd > 0) {
cl_log(LOG_INFO,
"Received command %s from %s on disk %s",
char2cmd(s_mbox->cmd), s_mbox->from, diskname);
switch (s_mbox->cmd) {
case SBD_MSG_TEST:
memset(s_mbox, 0, sizeof(*s_mbox));
mbox_write(st, mbox, s_mbox);
sigqueue(ppid, SIG_TEST, signal_value);
break;
case SBD_MSG_RESET:
do_reset();
break;
case SBD_MSG_OFF:
do_off();
break;
case SBD_MSG_EXIT:
sigqueue(ppid, SIG_EXITREQ, signal_value);
break;
case SBD_MSG_CRASHDUMP:
do_crashdump();
break;
default:
/* FIXME:
An "unknown" message might result
from a partial write.
log it and clear the slot.
*/
cl_log(LOG_ERR, "Unknown message on disk %s",
diskname);
memset(s_mbox, 0, sizeof(*s_mbox));
mbox_write(st, mbox, s_mbox);
break;
}
}
sigqueue(ppid, SIG_LIVENESS, signal_value);
t1 = time(NULL);
latency = t1 - t0;
if (timeout_watchdog_warn && (latency > timeout_watchdog_warn)) {
cl_log(LOG_WARNING,
"Latency: %d exceeded threshold %d on disk %s",
(int)latency, (int)timeout_watchdog_warn,
diskname);
} else if (debug) {
DBGLOG(LOG_INFO, "Latency: %d on disk %s", (int)latency,
diskname);
}
}
out:
free(s_mbox);
close_device(st);
if (rc == 0) {
servant_inform_parent = 0;
}
return rc;
}
void recruit_servant(const char *devname, pid_t pid)
{
struct servants_list_item *s = servants_leader;
struct servants_list_item *newbie;
newbie = malloc(sizeof(*newbie));
if (!newbie) {
fprintf(stderr, "malloc failed in recruit_servant.\n");
exit(1);
}
memset(newbie, 0, sizeof(*newbie));
newbie->devname = strdup(devname);
newbie->pid = pid;
newbie->first_start = 1;
if (!s) {
servants_leader = newbie;
} else {
while (s->next)
s = s->next;
s->next = newbie;
}
servant_count++;
}
struct servants_list_item *lookup_servant_by_dev(const char *devname)
{
struct servants_list_item *s;
for (s = servants_leader; s; s = s->next) {
if (strncasecmp(s->devname, devname, strlen(s->devname)))
break;
}
return s;
}
struct servants_list_item *lookup_servant_by_pid(pid_t pid)
{
struct servants_list_item *s;
for (s = servants_leader; s; s = s->next) {
if (s->pid == pid)
break;
}
return s;
}
int check_all_dead(void)
{
struct servants_list_item *s;
int r = 0;
union sigval svalue;
for (s = servants_leader; s; s = s->next) {
if (s->pid != 0) {
r = sigqueue(s->pid, 0, svalue);
if (r == -1 && errno == ESRCH)
continue;
return 0;
}
}
return 1;
}
void servant_start(struct servants_list_item *s)
{
int r = 0;
union sigval svalue;
if (s->pid != 0) {
r = sigqueue(s->pid, 0, svalue);
if ((r != -1 || errno != ESRCH))
return;
}
s->restarts++;
if (strcmp("pcmk",s->devname) == 0) {
DBGLOG(LOG_INFO, "Starting Pacemaker servant");
s->pid = assign_servant(s->devname, servant_pcmk, NULL);
} else {
DBGLOG(LOG_INFO, "Starting servant for device %s",
s->devname);
s->pid = assign_servant(s->devname, servant, s);
}
clock_gettime(CLOCK_MONOTONIC, &s->t_started);
return;
}
void servants_start(void)
{
struct servants_list_item *s;
for (s = servants_leader; s; s = s->next) {
s->restarts = 0;
servant_start(s);
}
}
void servants_kill(void)
{
struct servants_list_item *s;
union sigval svalue;
for (s = servants_leader; s; s = s->next) {
if (s->pid != 0)
sigqueue(s->pid, SIGKILL, svalue);
}
}
int check_timeout_inconsistent(void)
{
struct sbd_context *st;
struct sector_header_s *hdr_cur = 0, *hdr_last = 0;
struct servants_list_item* s;
int inconsistent = 0;
for (s = servants_leader; s; s = s->next) {
st = open_device(s->devname);
if (!st)
continue;
hdr_cur = header_get(st);
close_device(st);
if (!hdr_cur)
continue;
if (hdr_last) {
if (hdr_last->timeout_watchdog != hdr_cur->timeout_watchdog
|| hdr_last->timeout_allocate != hdr_cur->timeout_allocate
|| hdr_last->timeout_loop != hdr_cur->timeout_loop
|| hdr_last->timeout_msgwait != hdr_cur->timeout_msgwait)
inconsistent = 1;
free(hdr_last);
}
hdr_last = hdr_cur;
}
if (hdr_last) {
timeout_watchdog = hdr_last->timeout_watchdog;
timeout_allocate = hdr_last->timeout_allocate;
timeout_loop = hdr_last->timeout_loop;
timeout_msgwait = hdr_last->timeout_msgwait;
} else {
cl_log(LOG_ERR, "No devices were available at start-up.");
exit(1);
}
free(hdr_last);
return inconsistent;
}
inline void cleanup_servant_by_pid(pid_t pid)
{
struct servants_list_item* s;
s = lookup_servant_by_pid(pid);
if (s) {
cl_log(LOG_WARNING, "Servant for %s (pid: %i) has terminated",
s->devname, s->pid);
s->pid = 0;
} else {
/* This most likely is a stray signal from somewhere, or
* a SIGCHLD for a process that has previously
* explicitly disconnected. */
DBGLOG(LOG_INFO, "cleanup_servant: Nothing known about pid %i",
pid);
}
}
int inquisitor_decouple(void)
{
pid_t ppid = getppid();
union sigval signal_value;
/* During start-up, we only arm the watchdog once we've got
* quorum at least once. */
if (watchdog_use) {
if (watchdog_init() < 0) {
return -1;
}
}
if (ppid > 1) {
sigqueue(ppid, SIG_LIVENESS, signal_value);
}
return 0;
}
void inquisitor_child(void)
{
int sig, pid;
sigset_t procmask;
siginfo_t sinfo;
int status;
struct timespec timeout;
int exiting = 0;
int decoupled = 0;
int pcmk_healthy = 0;
int pcmk_override = 0;
time_t latency;
struct timespec t_last_tickle, t_now;
struct servants_list_item* s;
if (debug_mode) {
cl_log(LOG_ERR, "DEBUG MODE IS ACTIVE - DO NOT RUN IN PRODUCTION!");
}
set_proc_title("sbd: inquisitor");
if (pidfile) {
if (cl_lock_pidfile(pidfile) < 0) {
exit(1);
}
}
sigemptyset(&procmask);
sigaddset(&procmask, SIGCHLD);
sigaddset(&procmask, SIG_LIVENESS);
sigaddset(&procmask, SIG_EXITREQ);
sigaddset(&procmask, SIG_TEST);
sigaddset(&procmask, SIG_IO_FAIL);
sigaddset(&procmask, SIG_PCMK_UNHEALTHY);
sigaddset(&procmask, SIG_RESTART);
sigaddset(&procmask, SIGUSR1);
sigaddset(&procmask, SIGUSR2);
sigprocmask(SIG_BLOCK, &procmask, NULL);
/* We only want this to have an effect during watch right now;
* pinging and fencing would be too confused */
if (check_pcmk) {
recruit_servant("pcmk", 0);
servant_count--;
}
servants_start();
timeout.tv_sec = timeout_loop;
timeout.tv_nsec = 0;
clock_gettime(CLOCK_MONOTONIC, &t_last_tickle);
while (1) {
int good_servants = 0;
sig = sigtimedwait(&procmask, &sinfo, &timeout);
clock_gettime(CLOCK_MONOTONIC, &t_now);
if (sig == SIG_EXITREQ) {
servants_kill();
watchdog_close();
exiting = 1;
} else if (sig == SIGCHLD) {
while ((pid = waitpid(-1, &status, WNOHANG))) {
if (pid == -1 && errno == ECHILD) {
break;
} else {
cleanup_servant_by_pid(pid);
}
}
} else if (sig == SIG_PCMK_UNHEALTHY) {
s = lookup_servant_by_pid(sinfo.si_pid);
if (s && strcmp(s->devname, "pcmk") == 0) {
if (pcmk_healthy != 0) {
cl_log(LOG_WARNING, "Pacemaker health check: UNHEALTHY");
}
pcmk_healthy = 0;
clock_gettime(CLOCK_MONOTONIC, &s->t_last);
} else {
cl_log(LOG_WARNING, "Ignoring SIG_PCMK_UNHEALTHY from unknown source");
}
} else if (sig == SIG_IO_FAIL) {
s = lookup_servant_by_pid(sinfo.si_pid);
if (s) {
DBGLOG(LOG_INFO, "Servant for %s requests to be disowned",
s->devname);
cleanup_servant_by_pid(sinfo.si_pid);
}
} else if (sig == SIG_LIVENESS) {
s = lookup_servant_by_pid(sinfo.si_pid);
if (s) {
if (strcmp(s->devname, "pcmk") == 0) {
if (pcmk_healthy != 1) {
cl_log(LOG_INFO, "Pacemaker health check: OK");
}
pcmk_healthy = 1;
};
s->first_start = 0;
clock_gettime(CLOCK_MONOTONIC, &s->t_last);
}
} else if (sig == SIG_TEST) {
} else if (sig == SIGUSR1) {
if (exiting)
continue;
servants_start();
}
if (exiting) {
if (check_all_dead()) {
if (pidfile) {
cl_unlock_pidfile(pidfile);
}
exit(0);
} else
continue;
}
good_servants = 0;
for (s = servants_leader; s; s = s->next) {
int age = t_now.tv_sec - s->t_last.tv_sec;
if (!s->t_last.tv_sec)
continue;
if (age < (int)(timeout_io+timeout_loop)) {
if (strcmp(s->devname, "pcmk") != 0) {
good_servants++;
}
s->outdated = 0;
} else if (!s->outdated) {
if (strcmp(s->devname, "pcmk") == 0) {
/* If the state is outdated, we
* override the last reported
* state */
pcmk_healthy = 0;
cl_log(LOG_WARNING, "Pacemaker state outdated (age: %d)",
age);
} else if (!s->restart_blocked) {
cl_log(LOG_WARNING, "Servant for %s outdated (age: %d)",
s->devname, age);
}
s->outdated = 1;
}
}
if (quorum_read(good_servants) || pcmk_healthy) {
if (!decoupled) {
if (inquisitor_decouple() < 0) {
servants_kill();
exiting = 1;
continue;
} else {
decoupled = 1;
}
}
if (!quorum_read(good_servants)) {
if (!pcmk_override) {
cl_log(LOG_WARNING, "Majority of devices lost - surviving on pacemaker");
pcmk_override = 1; /* Just to ensure the message is only logged once */
}
} else {
pcmk_override = 0;
}
watchdog_tickle();
clock_gettime(CLOCK_MONOTONIC, &t_last_tickle);
}
/* Note that this can actually be negative, since we set
* last_tickle after we set now. */
latency = t_now.tv_sec - t_last_tickle.tv_sec;
if (timeout_watchdog && (latency > (int)timeout_watchdog)) {
if (!decoupled) {
/* We're still being watched by our
* parent. We don't fence, but exit. */
cl_log(LOG_ERR, "SBD: Not enough votes to proceed. Aborting start-up.");
servants_kill();
exiting = 1;
continue;
}
if (debug_mode < 2) {
/* At level 2 or above, we do nothing, but expect
* things to eventually return to
* normal. */
do_reset();
} else {
cl_log(LOG_ERR, "SBD: DEBUG MODE: Would have fenced due to timeout!");
}
}
if (timeout_watchdog_warn && (latency > (int)timeout_watchdog_warn)) {
cl_log(LOG_WARNING,
"Latency: No liveness for %d s exceeds threshold of %d s (healthy servants: %d)",
(int)latency, (int)timeout_watchdog_warn, good_servants);
}
for (s = servants_leader; s; s = s->next) {
int age = t_now.tv_sec - s->t_started.tv_sec;
if (age > servant_restart_interval) {
s->restarts = 0;
s->restart_blocked = 0;
}
if (servant_restart_count
&& (s->restarts >= servant_restart_count)
&& !s->restart_blocked) {
if (servant_restart_count > 1) {
cl_log(LOG_WARNING, "Max retry count (%d) reached: not restarting servant for %s",
(int)servant_restart_count, s->devname);
}
s->restart_blocked = 1;
}
if (!s->restart_blocked) {
servant_start(s);
}
}
}
/* not reached */
exit(0);
}
int inquisitor(void)
{
int sig, pid, inquisitor_pid;
int status;
sigset_t procmask;
siginfo_t sinfo;
/* Where's the best place for sysrq init ?*/
sysrq_init();
sigemptyset(&procmask);
sigaddset(&procmask, SIGCHLD);
sigaddset(&procmask, SIG_LIVENESS);
sigprocmask(SIG_BLOCK, &procmask, NULL);
if (check_timeout_inconsistent() == 1) {
fprintf(stderr, "Timeout settings are different across SBD devices!\n");
fprintf(stderr, "You have to correct them and re-start SBD again.\n");
return -1;
}
inquisitor_pid = make_daemon();
if (inquisitor_pid == 0) {
inquisitor_child();
}
/* We're the parent. Wait for a happy signal from our child
* before we proceed - we either get "SIG_LIVENESS" when the
* inquisitor has completed the first successful round, or
* ECHLD when it exits with an error. */
while (1) {
sig = sigwaitinfo(&procmask, &sinfo);
if (sig == SIGCHLD) {
while ((pid = waitpid(-1, &status, WNOHANG))) {
if (pid == -1 && errno == ECHILD) {
break;
}
/* We got here because the inquisitor
* did not succeed. */
return -1;
}
} else if (sig == SIG_LIVENESS) {
/* Inquisitor started up properly. */
return 0;
} else {
fprintf(stderr, "Nobody expected the spanish inquisition!\n");
continue;
}
}
/* not reached */
return -1;
}
int messenger(const char *name, const char *msg)
{
int sig = 0;
pid_t pid = 0;
int status = 0;
int servants_finished = 0;
int successful_delivery = 0;
sigset_t procmask;
siginfo_t sinfo;
struct servants_list_item *s;
struct slot_msg_arg_t slot_msg_arg = {name, msg};
sigemptyset(&procmask);
sigaddset(&procmask, SIGCHLD);
sigprocmask(SIG_BLOCK, &procmask, NULL);
for (s = servants_leader; s; s = s->next) {
s->pid = assign_servant(s->devname, &slot_msg_wrapper, &slot_msg_arg);
}
while (!(quorum_write(successful_delivery) ||
(servants_finished == servant_count))) {
sig = sigwaitinfo(&procmask, &sinfo);
if (sig == SIGCHLD) {
while ((pid = waitpid(-1, &status, WNOHANG))) {
if (pid == -1 && errno == ECHILD) {
break;
} else {
servants_finished++;
if (WIFEXITED(status)
&& WEXITSTATUS(status) == 0) {
DBGLOG(LOG_INFO, "Process %d succeeded.",
(int)pid);
successful_delivery++;
} else {
cl_log(LOG_WARNING, "Process %d failed to deliver!",
(int)pid);
}
}
}
}
}
if (quorum_write(successful_delivery)) {
cl_log(LOG_INFO, "Message successfully delivered.");
return 0;
} else {
cl_log(LOG_ERR, "Message is not delivered via more then a half of devices");
return -1;
}
}
int dump_headers(void)
{
int rc = 0;
struct servants_list_item *s = servants_leader;
struct sbd_context *st;
for (s = servants_leader; s; s = s->next) {
fprintf(stdout, "==Dumping header on disk %s\n", s->devname);
st = open_device(s->devname);
if (!st) {
fprintf(stdout, "== disk %s unreadable!\n", s->devname);
continue;
}
rc = header_dump(st);
close_device(st);
if (rc == -1) {
fprintf(stdout, "==Header on disk %s NOT dumped\n", s->devname);
} else {
fprintf(stdout, "==Header on disk %s is dumped\n", s->devname);
}
}
return rc;
}
int main(int argc, char **argv, char **envp)
{
int exit_status = 0;
int c;
if ((cmdname = strrchr(argv[0], '/')) == NULL) {
cmdname = argv[0];
} else {
++cmdname;
}
cl_log_set_entity(cmdname);
cl_log_enable_stderr(0);
cl_log_set_facility(LOG_DAEMON);
sbd_get_uname();
while ((c = getopt(argc, argv, "C:DPRTWZhvw:d:n:p:1:2:3:4:5:t:I:F:S:")) != -1) {
switch (c) {
case 'D':
break;
case 'Z':
debug_mode++;
cl_log(LOG_INFO, "Debug mode now at level %d", (int)debug_mode);
break;
case 'R':
skip_rt = 1;
cl_log(LOG_INFO, "Realtime mode deactivated.");
break;
case 'S':
start_mode = atoi(optarg);
cl_log(LOG_INFO, "Start mode set to: %d", (int)start_mode);
break;
case 'v':
debug = 1;
cl_log(LOG_INFO, "Verbose mode enabled.");
break;
case 'T':
watchdog_set_timeout = 0;
cl_log(LOG_INFO, "Setting watchdog timeout disabled; using defaults.");
break;
case 'W':
watchdog_use = 1;
cl_log(LOG_INFO, "Watchdog enabled.");
break;
case 'w':
watchdogdev = strdup(optarg);
break;
case 'd':
recruit_servant(optarg, 0);
break;
case 'P':
check_pcmk = 1;
break;
case 'n':
local_uname = strdup(optarg);
cl_log(LOG_INFO, "Overriding local hostname to %s", local_uname);
break;
case 'p':
pidfile = strdup(optarg);
cl_log(LOG_INFO, "pidfile set to %s", pidfile);
break;
case 'C':
timeout_watchdog_crashdump = atoi(optarg);
cl_log(LOG_INFO, "Setting crashdump watchdog timeout to %d",
(int)timeout_watchdog_crashdump);
break;
case '1':
timeout_watchdog = atoi(optarg);
break;
case '2':
timeout_allocate = atoi(optarg);
break;
case '3':
timeout_loop = atoi(optarg);
break;
case '4':
timeout_msgwait = atoi(optarg);
break;
case '5':
timeout_watchdog_warn = atoi(optarg);
cl_log(LOG_INFO, "Setting latency warning to %d",
(int)timeout_watchdog_warn);
break;
case 't':
servant_restart_interval = atoi(optarg);
cl_log(LOG_INFO, "Setting servant restart interval to %d",
(int)servant_restart_interval);
break;
case 'I':
timeout_io = atoi(optarg);
cl_log(LOG_INFO, "Setting IO timeout to %d",
(int)timeout_io);
break;
case 'F':
servant_restart_count = atoi(optarg);
cl_log(LOG_INFO, "Servant restart count set to %d",
(int)servant_restart_count);
break;
case 'h':
usage();
return (0);
default:
exit_status = -2;
goto out;
break;
}
}
if (servant_count < 1 || servant_count > 3) {
fprintf(stderr, "You must specify 1 to 3 devices via the -d option.\n");
exit_status = -1;
goto out;
}
/* There must at least be one command following the options: */
if ((argc - optind) < 1) {
fprintf(stderr, "Not enough arguments.\n");
exit_status = -2;
goto out;
}
if (init_set_proc_title(argc, argv, envp) < 0) {
fprintf(stderr, "Allocation of proc title failed.\n");
exit_status = -1;
goto out;
}
maximize_priority();
if (strcmp(argv[optind], "create") == 0) {
exit_status = init_devices();
} else if (strcmp(argv[optind], "dump") == 0) {
exit_status = dump_headers();
} else if (strcmp(argv[optind], "allocate") == 0) {
exit_status = allocate_slots(argv[optind + 1]);
} else if (strcmp(argv[optind], "list") == 0) {
exit_status = list_slots();
} else if (strcmp(argv[optind], "message") == 0) {
exit_status = messenger(argv[optind + 1], argv[optind + 2]);
} else if (strcmp(argv[optind], "ping") == 0) {
exit_status = ping_via_slots(argv[optind + 1]);
} else if (strcmp(argv[optind], "watch") == 0) {
exit_status = inquisitor();
} else {
exit_status = -2;
}
out:
if (exit_status < 0) {
if (exit_status == -2) {
usage();
} else {
fprintf(stderr, "sbd failed; please check the logs.\n");
}
return (1);
}
return (0);
}

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