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	diff --git a/src/sbd-common.c b/src/sbd-common.c
	index 3abf75f..249899d 100644
	--- a/src/sbd-common.c
	+++ b/src/sbd-common.c
	@@ -1,1355 +1,1362 @@
	/*
	* 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 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 program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#include "sbd.h"
	#include <sys/reboot.h>
	#include <sys/types.h>
	#ifdef __GLIBC__
	#include <sys/sysmacros.h>
	#endif
	#include <sys/stat.h>
	#include <pwd.h>
	#include <unistd.h>
	#include <dirent.h>
	#include <sys/time.h>
	#include <sys/resource.h>
	#include <limits.h>

	#ifdef _POSIX_MEMLOCK
	# include <sys/mman.h>
	#endif

	/* Tunable defaults: */
	unsigned long timeout_watchdog = SBD_WATCHDOG_TIMEOUT_DEFAULT;
	int timeout_msgwait = 2 * SBD_WATCHDOG_TIMEOUT_DEFAULT;
	unsigned long timeout_watchdog_warn = calculate_timeout_watchdog_warn(SBD_WATCHDOG_TIMEOUT_DEFAULT);
	bool do_calculate_timeout_watchdog_warn = true;
	int timeout_allocate = 2;
	int timeout_loop = 1;
	int timeout_io = 3;
	int timeout_startup = 120;

	int watchdog_use = 1;
	int watchdog_set_timeout = 1;
	unsigned long timeout_watchdog_crashdump = 0;
	int skip_rt = 0;
	int debug = 0;
	int debug_mode = 0;
	char *watchdogdev = NULL;
	bool watchdogdev_is_default = false;
	char * local_uname;

	/* Global, non-tunable variables: */
	int sector_size = 0;
	int watchdogfd = -1;
	int servant_health = 0;

	/const char devname;*/
	const char *cmdname;

	void
	usage(void)
	{
	fprintf(stderr,
	"Shared storage fencing tool.\n"
	"Syntax:\n"
	" %s <options> <command> <cmdarguments>\n"
	"Options:\n"
	"-d <devname> Block device to use (mandatory; can be specified up to 3 times)\n"
	"-h Display this help.\n"
	"-n <node> Set local node name; defaults to uname -n (optional)\n"
	"\n"
	"-R Do NOT enable realtime priority (debugging only)\n"
	"-W Use watchdog (recommended) (watch only)\n"
	"-w <dev> Specify watchdog device (optional) (watch only)\n"
	"-T Do NOT initialize the watchdog timeout (watch only)\n"
	"-S <0\|1> Set start mode if the node was previously fenced (watch only)\n"
	"-p <path> Write pidfile to the specified path (watch only)\n"
	"-v\|-vv\|-vvv Enable verbose\|debug\|debug-library logging (optional)\n"
	"\n"
	"-1 <N> Set watchdog timeout to N seconds (optional, create only)\n"
	"-2 <N> Set slot allocation timeout to N seconds (optional, create only)\n"
	"-3 <N> Set daemon loop timeout to N seconds (optional, create only)\n"
	"-4 <N> Set msgwait timeout to N seconds (optional, create only)\n"
	"-5 <N> Warn if loop latency exceeds threshold (optional, watch only)\n"
	" (default is 3, set to 0 to disable)\n"
	"-C <N> Watchdog timeout to set before crashdumping\n"
	" (def: 0s = disable gracefully, optional)\n"
	"-I <N> Async IO read timeout (defaults to 3 * loop timeout, optional)\n"
	"-s <N> Timeout to wait for devices to become available (def: 120s)\n"
	"-t <N> Dampening delay before faulty servants are restarted (optional)\n"
	" (default is 5, set to 0 to disable)\n"
	"-F <N> # of failures before a servant is considered faulty (optional)\n"
	" (default is 1, set to 0 to disable)\n"
	"-P Check Pacemaker quorum and node health (optional, watch only)\n"
	"-Z Enable trace mode. WARNING: UNSAFE FOR PRODUCTION!\n"
	"-r Set timeout-action to comma-separated combination of\n"
	" noflush\|flush plus reboot\|crashdump\|off (default is flush,reboot)\n"
	"Commands:\n"
	#if SUPPORT_SHARED_DISK
	"create initialize N slots on <dev> - OVERWRITES DEVICE!\n"
	"list List all allocated slots on device, and messages.\n"
	"dump Dump meta-data header from device.\n"
	"allocate <node>\n"
	" Allocate a slot for node (optional)\n"
	"message <node> (test\|reset\|off\|crashdump\|clear\|exit)\n"
	" Writes the specified message to node's slot.\n"
	#endif
	"watch Loop forever, monitoring own slot\n"
	"query-watchdog Check for available watchdog-devices and print some info\n"
	"test-watchdog Test the watchdog-device selected.\n"
	" Attention: This will arm the watchdog and have your system reset\n"
	" in case your watchdog is working properly!\n"
	, cmdname);
	}

	#define MAX_WATCHDOGS 64
	#define SYS_CLASS_WATCHDOG "/sys/class/watchdog"
	#define SYS_CHAR_DEV_DIR "/sys/dev/char"
	#define WATCHDOG_NODEDIR "/dev/"

	static bool
	is_watchdog(dev_t device)
	{
	static int num_watchdog_devs = 0;
	static dev_t watchdog_devs[MAX_WATCHDOGS];
	struct dirent *entry;
	int i;

	/* populate on first call */
	if (num_watchdog_devs == 0) {
	DIR *dp;

	watchdog_devs[0] = makedev(10,130);
	num_watchdog_devs = 1;

	/* get additional devices from /sys/class/watchdog */
	dp = opendir(SYS_CLASS_WATCHDOG);
	if (dp) {
	while ((entry = readdir(dp))) {
	if (entry->d_type == DT_LNK) {
	FILE *file;
	char entry_name[NAME_MAX+sizeof(SYS_CLASS_WATCHDOG)+5];

	snprintf(entry_name, sizeof(entry_name),
	SYS_CLASS_WATCHDOG "/%s/dev", entry->d_name);
	file = fopen(entry_name, "r");
	if (file) {
	int major, minor;

	if (fscanf(file, "%d:%d", &major, &minor) == 2) {
	watchdog_devs[num_watchdog_devs++] = makedev(major, minor);
	}
	fclose(file);
	if (num_watchdog_devs == MAX_WATCHDOGS) {
	break;
	}
	}
	}
	}
	closedir(dp);
	}
	}

	for (i=0; i < num_watchdog_devs; i++) {
	if (device == watchdog_devs[i]) {
	return true;
	}
	}
	return false;
	}

	static int
	watchdog_init_interval_fd(int wdfd, int timeout)
	{
	if (ioctl(wdfd, WDIOC_SETTIMEOUT, &timeout) < 0) {
	cl_perror( "WDIOC_SETTIMEOUT"
	": Failed to set watchdog timer to %u seconds.",
	timeout);
	cl_log(LOG_CRIT, "Please validate your watchdog configuration!");
	cl_log(LOG_CRIT, "Choose a different watchdog driver or specify -T to skip this if you are completely sure.");
	return -1;
	}
	return 0;
	}

	int
	watchdog_init_interval(void)
	{
	if (watchdogfd < 0) {
	return 0;
	}

	if (watchdog_set_timeout == 0) {
	cl_log(LOG_INFO, "NOT setting watchdog timeout on explicit user request!");
	return 0;
	}

	if (watchdog_init_interval_fd(watchdogfd, timeout_watchdog) < 0) {
	return -1;
	}
	cl_log(LOG_INFO, "Set watchdog timeout to %u seconds.", (int) timeout_watchdog);
	return 0;
	}

	static int
	watchdog_tickle_fd(int wdfd, char *wddev)
	{
	if (write(wdfd, "", 1) != 1) {
	cl_perror("Watchdog write failure: %s!", wddev);
	return -1;
	}
	return 0;
	}

	int
	watchdog_tickle(void)
	{
	if (watchdogfd >= 0) {
	return watchdog_tickle_fd(watchdogfd, watchdogdev);
	}
	return 0;
	}

	static int
	watchdog_init_fd(char *wddev, int timeout)
	{
	int wdfd;

	wdfd = open(wddev, O_WRONLY);
	if (wdfd >= 0) {
	if (((timeout >= 0) && (watchdog_init_interval_fd(wdfd, timeout) < 0)) \|\|
	(watchdog_tickle_fd(wdfd, wddev) < 0)) {
	close(wdfd);
	return -1;
	}
	} else {
	struct stat statbuf;

	if(!stat(wddev, &statbuf) && S_ISCHR(statbuf.st_mode) &&
	is_watchdog(statbuf.st_rdev)) {
	cl_perror("Cannot open watchdog device '%s'", wddev);
	} else {
	cl_perror("Seems as if '%s' isn't a valid watchdog-device", wddev);
	}
	return -1;
	}
	return wdfd;
	}

	int
	watchdog_init(void)
	{
	if (watchdogfd < 0 && watchdogdev != NULL) {
	int timeout = timeout_watchdog;

	if (watchdog_set_timeout == 0) {
	cl_log(LOG_INFO, "NOT setting watchdog timeout on explicit user request!");
	timeout = -1;
	}
	watchdogfd = watchdog_init_fd(watchdogdev, timeout);
	if (watchdogfd >= 0) {
	cl_log(LOG_NOTICE, "Using watchdog device '%s'", watchdogdev);
	if (watchdog_set_timeout) {
	cl_log(LOG_INFO, "Set watchdog timeout to %u seconds.", (int) timeout_watchdog);
	}
	} else {
	return -1;
	}
	}
	return 0;
	}

	static void
	watchdog_close_fd(int wdfd, char *wddev, bool disarm)
	{
	if (disarm) {
	int r;
	int flags = WDIOS_DISABLECARD;;

	/* Explicitly disarm it */
	r = ioctl(wdfd, WDIOC_SETOPTIONS, &flags);
	if (r < 0) {
	cl_perror("Failed to disable hardware watchdog %s", wddev);
	}

	/* To be sure, use magic close logic, too */
	for (;;) {
	if (write(wdfd, "V", 1) > 0) {
	break;
	}
	cl_perror("Cannot disable watchdog device %s", wddev);
	}
	}

	if (close(wdfd) < 0) {
	cl_perror("Watchdog close(%d) failed", wdfd);
	}
	}

	void
	watchdog_close(bool disarm)
	{
	if (watchdogfd < 0) {
	return;
	}

	watchdog_close_fd(watchdogfd, watchdogdev, disarm);
	watchdogfd = -1;
	}

	struct watchdog_list_item {
	dev_t dev;
	char *dev_node;
	char *dev_ident;
	char *dev_driver;
	pid_t busy_pid;
	char *busy_name;
	struct watchdog_list_item *next;
	};

	struct link_list_item {
	char *dev_node;
	char *link_name;
	struct link_list_item *next;
	};

	static struct watchdog_list_item *watchdog_list = NULL;
	static int watchdog_list_items = 0;

	static void
	watchdog_populate_list(void)
	{
	struct dirent *entry;
	char entry_name[sizeof(WATCHDOG_NODEDIR)+NAME_MAX];
	DIR *dp;
	char buf[NAME_MAX+sizeof(WATCHDOG_NODEDIR)] = "";
	struct link_list_item *link_list = NULL;

	if (watchdog_list != NULL) {
	return;
	}

	/* search for watchdog nodes in /dev */
	dp = opendir(WATCHDOG_NODEDIR);
	if (dp) {
	/* first go for links and memorize them */
	while ((entry = readdir(dp))) {
	if (entry->d_type == DT_LNK) {
	int len;

	snprintf(entry_name, sizeof(entry_name),
	WATCHDOG_NODEDIR "%s", entry->d_name);

	/* realpath(entry_name, buf) unfortunately does a stat on
	* target so we can't really use it to check if links stay
	* within /dev without triggering e.g. AVC-logs (with
	* SELinux policy that just allows stat within /dev).
	* Without canonicalization that doesn't actually touch the
	* filesystem easily available introduce some limitations
	* for simplicity:
	* - just simple path without '..'
	* - just one level of symlinks (avoid e.g. loop-checking)
	*/
	len = readlink(entry_name, buf, sizeof(buf) - 1);
	if ((len < 1) \|\|
	(len > sizeof(buf) - sizeof(WATCHDOG_NODEDIR) -1 - 1)) {
	continue;
	}
	buf[len] = '\0';
	if (buf[0] != '/') {
	memmove(&buf[sizeof(WATCHDOG_NODEDIR)-1], buf, len+1);
	memcpy(buf, WATCHDOG_NODEDIR, sizeof(WATCHDOG_NODEDIR)-1);
	len += sizeof(WATCHDOG_NODEDIR)-1;
	}
	if (strstr(buf, "/../") \|\|
	strncmp(WATCHDOG_NODEDIR, buf, sizeof(WATCHDOG_NODEDIR)-1)) {
	continue;
	} else {
	/* just memorize to avoid statting the target - SELinux */
	struct link_list_item *lli =
	calloc(1, sizeof(struct link_list_item));

	if (lli == NULL) {
	break;
	}
	lli->dev_node = strdup(buf);
	lli->link_name = strdup(entry_name);
	if ((lli->dev_node == NULL) \|\| (lli->link_name == NULL)) {
	free(lli->dev_node);
	free(lli->link_name);
	free(lli);
	break;
	}
	lli->next = link_list;
	link_list = lli;
	}
	}
	}

	rewinddir(dp);

	while ((entry = readdir(dp))) {
	if (entry->d_type == DT_CHR) {
	struct stat statbuf;

	snprintf(entry_name, sizeof(entry_name),
	WATCHDOG_NODEDIR "%s", entry->d_name);
	if(!stat(entry_name, &statbuf) && S_ISCHR(statbuf.st_mode) &&
	is_watchdog(statbuf.st_rdev)) {

	int wdfd;
	struct watchdog_list_item *wdg =
	calloc(1, sizeof(struct watchdog_list_item));
	int len;
	struct link_list_item *tmp_list = NULL;

	if (wdg == NULL) {
	break;
	}

	wdg->dev = statbuf.st_rdev;
	wdg->dev_node = strdup(entry_name);
	if (wdg->dev_node == NULL) {
	free(wdg);
	break;
	}
	wdg->next = watchdog_list;
	watchdog_list = wdg;
	watchdog_list_items++;

	wdfd = watchdog_init_fd(entry_name, -1);
	if (wdfd >= 0) {
	struct watchdog_info ident;

	ident.identity[0] = '\0';
	ioctl(wdfd, WDIOC_GETSUPPORT, &ident);
	watchdog_close_fd(wdfd, entry_name, true);
	if (ident.identity[0]) {
	wdg->dev_ident = strdup((char *) ident.identity);
	}
	}

	snprintf(entry_name, sizeof(entry_name),
	SYS_CHAR_DEV_DIR "/%d:%d/device/driver",
	major(wdg->dev), minor(wdg->dev));
	len = readlink(entry_name, buf, sizeof(buf) - 1);
	if (len > 0) {
	buf[len] = '\0';
	wdg->dev_driver = strdup(basename(buf));
	} else if ((wdg->dev_ident) &&
	(strcmp(wdg->dev_ident,
	"Software Watchdog") == 0)) {
	wdg->dev_driver = strdup("softdog");
	}

	/* create dupes if we have memorized links
	* to this node
	*/
	for (tmp_list = link_list; tmp_list;
	tmp_list = tmp_list->next) {
	if (!strcmp(tmp_list->dev_node,
	wdg->dev_node)) {
	struct watchdog_list_item *dupe_wdg =
	calloc(1, sizeof(struct watchdog_list_item));

	if (dupe_wdg == NULL) {
	break;
	}
	/* as long as we never purge watchdog_list
	* there is no need to dupe strings
	*/
	dupe_wdg = wdg;
	dupe_wdg->dev_node = strdup(tmp_list->link_name);
	if (dupe_wdg->dev_node == NULL) {
	free(dupe_wdg);
	break;
	}
	dupe_wdg->next = watchdog_list;
	watchdog_list = dupe_wdg;
	watchdog_list_items++;
	}
	/* for performance reasons we could remove
	* the link_list entry
	*/
	}
	}
	}
	}

	closedir(dp);
	}

	/* cleanup link list */
	while (link_list) {
	struct link_list_item *tmp_list = link_list;

	link_list = link_list->next;
	free(tmp_list->dev_node);
	free(tmp_list->link_name);
	free(tmp_list);
	}
	}

	static void
	watchdog_checkbusy()
	{
	DIR *dproc;
	struct dirent *entry;

	dproc = opendir("/proc");
	if (!dproc) {
	/* no proc directory to search through */
	return;
	}

	while ((entry = readdir(dproc)) != NULL) {
	pid_t local_pid;
	char *leftover;
	DIR *dpid;
	char procpath[NAME_MAX+10] = { 0 };

	if (entry->d_name[0] == '.') {
	continue;
	}

	local_pid = strtol(entry->d_name, &leftover, 10);
	if (leftover[0] != '\0')
	continue;

	snprintf(procpath, sizeof(procpath), "/proc/%s/fd", entry->d_name);
	dpid = opendir(procpath);
	if (!dpid) {
	/* silently continue - might be just a race */
	continue;
	}
	while ((entry = readdir(dpid)) != NULL) {
	struct watchdog_list_item *wdg;
	char entry_name[sizeof(procpath)+NAME_MAX+1] = { 0 };
	char buf[NAME_MAX+1] = { 0 };
	int len;

	if (entry->d_type != DT_LNK) {
	continue;
	}
	snprintf(entry_name, sizeof(entry_name),
	"%s/%s", procpath, entry->d_name);
	len = readlink(entry_name, buf, sizeof(buf) - 1);
	if (len < 1) {
	continue;
	}
	buf[len] = '\0';
	for (wdg = watchdog_list; wdg != NULL; wdg = wdg->next) {
	if (!strcmp(buf, wdg->dev_node)) {
	char name[16];
	FILE *file;

	wdg->busy_pid = local_pid;
	snprintf(procpath, sizeof(procpath), "/proc/%d/status", local_pid);
	file = fopen(procpath, "r");
	if (file) {
	if (fscanf(file, "Name:\t%15[a-zA-Z0-9 _-]", name) == 1) {
	wdg->busy_name = strdup(name);
	}
	fclose(file);
	}
	}
	}
	}
	closedir(dpid);
	}

	closedir(dproc);

	return;
	}

	int watchdog_info(void)
	{
	struct watchdog_list_item *wdg;
	int wdg_cnt = 0;

	watchdog_populate_list();
	watchdog_checkbusy();
	printf("\nDiscovered %d watchdog devices:\n", watchdog_list_items);
	for (wdg = watchdog_list; wdg != NULL; wdg = wdg->next) {
	wdg_cnt++;
	if (wdg->busy_pid) {
	printf("\n[%d] %s\nIdentity: Busy: PID %d (%s)\nDriver: %s\n",
	wdg_cnt, wdg->dev_node,
	wdg->busy_pid,
	wdg->busy_name?wdg->busy_name:"<unknown>",
	wdg->dev_driver?wdg->dev_driver:"<unknown>");
	} else {
	printf("\n[%d] %s\nIdentity: %s\nDriver: %s\n",
	wdg_cnt, wdg->dev_node,
	wdg->dev_ident?wdg->dev_ident:
	"Error: device hogged via alias major/minor?",
	wdg->dev_driver?wdg->dev_driver:"<unknown>");
	}
	if ((wdg->dev_driver) && (strcmp(wdg->dev_driver, "softdog") == 0)) {
	printf("CAUTION: Not recommended for use with sbd.\n");
	}
	}

	return 0;
	}

	int watchdog_test(void)
	{
	int i;

	if ((watchdog_set_timeout == 0) \|\| !watchdog_use) {
	printf("\nWatchdog is disabled - aborting test!!!\n");
	return 0;
	}
	if (watchdogdev_is_default) {
	watchdog_populate_list();
	if (watchdog_list_items > 1) {
	printf("\nError: Multiple watchdog devices discovered.\n"
	" Use -w <watchdog> or SBD_WATCHDOG_DEV to specify\n"
	" which device to reset the system with\n");
	watchdog_info();
	return -1;
	}
	}
	if ((isatty(fileno(stdin)))) {
	char buffer[16];
	printf("\nWARNING: This operation is expected to force-reboot this system\n"
	" without following any shutdown procedures.\n\n"
	"Proceed? [NO/Proceed] ");

	if ((fgets(buffer, 16, stdin) == NULL) \|\|
	strcmp(buffer, "Proceed\n")) {
	printf("\nAborting watchdog test!!!\n");
	return 0;
	}
	printf("\n");
	}
	printf("Initializing %s with a reset countdown of %d seconds ...\n",
	watchdogdev, (int) timeout_watchdog);
	if ((watchdog_init() < 0) \|\| (watchdog_init_interval() < 0)) {
	printf("Failed to initialize watchdog!!!\n");
	watchdog_info();
	return -1;
	}
	printf("\n");
	printf("NOTICE: The watchdog device is expected to reset the system\n"
	" in %d seconds. If system remains active beyond that time,\n"
	" watchdog may not be functional.\n\n", (int) timeout_watchdog);
	for (i=timeout_watchdog; i>1; i--) {
	printf("Reset countdown ... %d seconds\n", i);
	sleep(1);
	}
	for (i=2; i>0; i--) {
	printf("System expected to reset any moment ...\n");
	sleep(1);
	}
	for (i=5; i>0; i--) {
	printf("System should have reset ...\n");
	sleep(1);
	}
	printf("Error: The watchdog device has failed to reboot the system,\n"
	" and it may not be suitable for usage with sbd.\n");

	/* test should trigger a reboot thus returning is actually bad */
	return -1;
	}

	/* This duplicates some code from linux/ioprio.h since these are not included
	* even in linux-kernel-headers. Sucks. See also
	* /usr/src/linux/Documentation/block/ioprio.txt and ioprio_set(2) */
	extern int sys_ioprio_set(int, int, int);
	int ioprio_set(int which, int who, int ioprio);
	inline int ioprio_set(int which, int who, int ioprio)
	{
	return syscall(__NR_ioprio_set, which, who, ioprio);
	}

	enum {
	IOPRIO_CLASS_NONE,
	IOPRIO_CLASS_RT,
	IOPRIO_CLASS_BE,
	IOPRIO_CLASS_IDLE,
	};

	enum {
	IOPRIO_WHO_PROCESS = 1,
	IOPRIO_WHO_PGRP,
	IOPRIO_WHO_USER,
	};

	#define IOPRIO_BITS (16)
	#define IOPRIO_CLASS_SHIFT (13)
	#define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1)

	#define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
	#define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK)
	#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) \| data)

	static void
	sbd_stack_hogger(unsigned char * inbuf, int kbytes)
	{
	unsigned char buf[1024];

	if(kbytes <= 0) {
	return;
	}

	if (inbuf == NULL) {
	memset(buf, HOG_CHAR, sizeof(buf));
	} else {
	memcpy(buf, inbuf, sizeof(buf));
	}

	if (kbytes > 0) {
	sbd_stack_hogger(buf, kbytes-1);
	}

	return;
	}

	static void
	sbd_malloc_hogger(int kbytes)
	{
	int j;
	void**chunks;
	int chunksize = 1024;

	if(kbytes <= 0) {
	return;
	}

	/*
	* We could call mallopt(M_MMAP_MAX, 0) to disable it completely,
	* but we've already called mlockall()
	*
	* We could also call mallopt(M_TRIM_THRESHOLD, -1) to prevent malloc
	* from giving memory back to the system, but we've already called
	* mlockall(MCL_FUTURE), so there's no need.
	*/

	chunks = malloc(kbytes * sizeof(void *));
	if (chunks == NULL) {
	cl_log(LOG_WARNING, "Could not preallocate chunk array");
	return;
	}

	for (j=0; j < kbytes; ++j) {
	chunks[j] = malloc(chunksize);
	if (chunks[j] == NULL) {
	cl_log(LOG_WARNING, "Could not preallocate block %d", j);

	} else {
	memset(chunks[j], 0, chunksize);
	}
	}

	for (j=0; j < kbytes; ++j) {
	free(chunks[j]);
	}

	free(chunks);
	}

	static void sbd_memlock(int stackgrowK, int heapgrowK)
	{

	#ifdef _POSIX_MEMLOCK
	/*
	* We could call setrlimit(RLIMIT_MEMLOCK,...) with a large
	* number, but the mcp runs as root and mlock(2) says:
	*
	* Since Linux 2.6.9, no limits are placed on the amount of memory
	* that a privileged process may lock, and this limit instead
	* governs the amount of memory that an unprivileged process may
	* lock.
	*/
	if (mlockall(MCL_CURRENT\|MCL_FUTURE) >= 0) {
	cl_log(LOG_INFO, "Locked ourselves in memory");

	/* Now allocate some extra pages (MCL_FUTURE will ensure they stay around) */
	sbd_malloc_hogger(heapgrowK);
	sbd_stack_hogger(NULL, stackgrowK);

	} else {
	cl_perror("Unable to lock ourselves into memory");
	}

	#else
	cl_log(LOG_ERR, "Unable to lock ourselves into memory");
	#endif
	}

	static int get_realtime_budget(void)
	{
	FILE *f;
	char fname[PATH_MAX];
	int res = -1, lnum = 0, num;
	char cgroup = NULL, namespecs = NULL;

	snprintf(fname, PATH_MAX, "/proc/%jd/cgroup", (intmax_t)getpid());
	f = fopen(fname, "rt");
	if (f == NULL) {
	cl_log(LOG_WARNING, "Can't open cgroup file for pid=%jd",
	(intmax_t)getpid());
	goto exit_res;
	}
	while( (num = fscanf(f, "%d:%m[^:]:%m[^\n]\n", &lnum,
	&namespecs, &cgroup)) !=EOF ) {
	if (namespecs && strstr(namespecs, "cpuacct")) {
	free(namespecs);
	break;
	}
	if (cgroup) {
	free(cgroup);
	cgroup = NULL;
	}
	if (namespecs) {
	free(namespecs);
	namespecs = NULL;
	}
	/* not to get stuck if format changes */
	if ((num < 3) && ((fscanf(f, "%*[^\n]") == EOF) \|\|
	(fscanf(f, "\n") == EOF))) {
	break;
	}
	}
	fclose(f);
	if (cgroup == NULL) {
	cl_log(LOG_WARNING, "Failed getting cgroup for pid=%jd",
	(intmax_t)getpid());
	goto exit_res;
	}
	snprintf(fname, PATH_MAX, "/sys/fs/cgroup/cpu%s/cpu.rt_runtime_us",
	cgroup);
	f = fopen(fname, "rt");
	if (f == NULL) {
	cl_log(LOG_WARNING, "cpu.rt_runtime_us existed for root-slice but "
	"doesn't for '%s'", cgroup);
	goto exit_res;
	}
	if (fscanf(f, "%d", &res) != 1) {
	cl_log(LOG_WARNING, "failed reading rt-budget from %s", fname);
	} else {
	cl_log(LOG_INFO, "slice='%s' has rt-budget=%d", cgroup, res);
	}
	fclose(f);

	exit_res:
	if (cgroup) {
	free(cgroup);
	}
	return res;
	}

	/* stolen from corosync */
	static int sbd_move_to_root_cgroup(bool enforce_root_cgroup) {
	FILE *f;
	int res = -1;

	/*
	* /sys/fs/cgroup is hardcoded, because most of Linux distributions are now
	* using systemd and systemd uses hardcoded path of cgroup mount point.
	*
	* This feature is expected to be removed as soon as systemd gets support
	* for managing RT configuration.
	*/
	f = fopen("/sys/fs/cgroup/cpu/cpu.rt_runtime_us", "rt");
	if (f == NULL) {
	cl_log(LOG_DEBUG, "cpu.rt_runtime_us doesn't exist -> "
	"system without cgroup or with disabled CONFIG_RT_GROUP_SCHED");
	res = 0;
	goto exit_res;
	}
	fclose(f);

	if ((!enforce_root_cgroup) && (get_realtime_budget() > 0)) {
	cl_log(LOG_DEBUG, "looks as if we have rt-budget in the slice we are "
	"-> skip moving to root-slice");
	res = 0;
	goto exit_res;
	}

	f = fopen("/sys/fs/cgroup/cpu/tasks", "w");
	if (f == NULL) {
	cl_log(LOG_WARNING, "Can't open cgroups tasks file for writing");

	goto exit_res;
	}

	if (fprintf(f, "%jd\n", (intmax_t)getpid()) <= 0) {
	cl_log(LOG_WARNING, "Can't write sbd pid into cgroups tasks file");
	goto close_and_exit_res;
	}

	close_and_exit_res:
	if (fclose(f) != 0) {
	cl_log(LOG_WARNING, "Can't close cgroups tasks file");
	goto exit_res;
	}

	exit_res:
	return (res);
	}

	void
	sbd_make_realtime(int priority, int stackgrowK, int heapgrowK)
	{
	if(priority < 0) {
	return;
	}

	do {
	#ifdef SCHED_RR
	if (move_to_root_cgroup) {
	sbd_move_to_root_cgroup(enforce_moving_to_root_cgroup);
	}

	{
	int pmin = sched_get_priority_min(SCHED_RR);
	int pmax = sched_get_priority_max(SCHED_RR);
	struct sched_param sp;
	int pcurrent;

	if (priority == 0) {
	priority = pmax;
	} else if (priority < pmin) {
	priority = pmin;
	} else if (priority > pmax) {
	priority = pmax;
	}

	if (sched_getparam(0, &sp) < 0) {
	cl_perror("Unable to get scheduler priority");

	} else if ((pcurrent = sched_getscheduler(0)) < 0) {
	cl_perror("Unable to get scheduler policy");

	} else if ((pcurrent == SCHED_RR) &&
	(sp.sched_priority >= priority)) {
	cl_log(LOG_INFO,
	"Stay with priority (%d) for policy SCHED_RR",
	sp.sched_priority);
	break;
	} else {
	memset(&sp, 0, sizeof(sp));
	sp.sched_priority = priority;

	if (sched_setscheduler(0, SCHED_RR, &sp) < 0) {
	cl_perror(
	"Unable to set scheduler policy to SCHED_RR priority %d",
	priority);
	} else {
	cl_log(LOG_INFO,
	"Scheduler policy is now SCHED_RR priority %d",
	priority);
	break;
	}
	}
	}
	#else
	cl_log(LOG_ERR, "System does not support updating the scheduler policy");
	#endif
	#ifdef PRIO_PGRP
	if (setpriority(PRIO_PGRP, 0, INT_MIN) < 0) {
	cl_perror("Unable to raise the scheduler priority");
	} else {
	cl_log(LOG_INFO, "Scheduler priority raised to the maximum");
	}
	#else
	cl_perror("System does not support setting the scheduler priority");
	#endif
	} while (0);

	sbd_memlock(heapgrowK, stackgrowK);
	}

	void
	maximize_priority(void)
	{
	if (skip_rt) {
	cl_log(LOG_INFO, "Not elevating to realtime (-R specified).");
	return;
	}

	sbd_make_realtime(0, 256, 256);

	if (ioprio_set(IOPRIO_WHO_PROCESS, getpid(),
	IOPRIO_PRIO_VALUE(IOPRIO_CLASS_RT, 1)) != 0) {
	cl_perror("ioprio_set() call failed.");
	}
	}

	void
	sysrq_init(void)
	{
	FILE* procf;
	int c;
	procf = fopen("/proc/sys/kernel/sysrq", "r");
	if (!procf) {
	cl_perror("cannot open /proc/sys/kernel/sysrq for read.");
	return;
	}
	if (fscanf(procf, "%d", &c) != 1) {
	cl_perror("Parsing sysrq failed");
	c = 0;
	}
	fclose(procf);
	if (c == 1)
	return;
	/* 8 for debugging dumps of processes,
	128 for reboot/poweroff */
	c \|= 136;
	procf = fopen("/proc/sys/kernel/sysrq", "w");
	if (!procf) {
	cl_perror("cannot open /proc/sys/kernel/sysrq for writing");
	return;
	}
	fprintf(procf, "%d", c);
	fclose(procf);
	return;
	}

	void
	sysrq_trigger(char t)
	{
	FILE *procf;

	procf = fopen("/proc/sysrq-trigger", "a");
	if (!procf) {
	cl_perror("Opening sysrq-trigger failed.");
	return;
	}
	cl_log(LOG_INFO, "sysrq-trigger: %c\n", t);
	fprintf(procf, "%c\n", t);
	fclose(procf);
	return;
	}


	static void
	do_exit(char kind, bool do_flush)
	{
	/* TODO: Turn debug_mode into a bit field? Delay + kdump for example */
	const char *reason = NULL;

	if (kind == 'c') {
	cl_log(LOG_NOTICE, "Initiating kdump");

	} else if (debug_mode == 1) {
	cl_log(LOG_WARNING, "Initiating kdump instead of panicking the node (debug mode)");
	kind = 'c';
	}

	if (debug_mode == 2) {
	cl_log(LOG_WARNING, "Shutting down SBD instead of panicking the node (debug mode)");
	watchdog_close(true);
	exit(0);
	}

	if (debug_mode == 3) {
	/* Give the system some time to flush logs to disk before rebooting. */
	cl_log(LOG_WARNING, "Delaying node panic by 10s (debug mode)");

	watchdog_close(true);
	sync();

	sleep(10);
	}

	switch(kind) {
	case 'b':
	reason = "reboot";
	break;
	case 'c':
	reason = "crashdump";
	break;
	case 'o':
	reason = "off";
	break;
	default:
	reason = "unknown";
	break;
	}

	cl_log(LOG_EMERG, "Rebooting system: %s", reason);
	if (do_flush) {
	sync();
	}

	if (kind == 'c') {
	if (timeout_watchdog_crashdump) {
	if (timeout_watchdog != timeout_watchdog_crashdump) {
	timeout_watchdog = timeout_watchdog_crashdump;
	watchdog_init_interval();
	}
	watchdog_close(false);
	} else {
	watchdog_close(true);
	}
	sysrq_trigger(kind);
	} else {
	watchdog_close(false);
	sysrq_trigger(kind);
	if (reboot((kind == 'o')?RB_POWER_OFF:RB_AUTOBOOT) < 0) {
	cl_perror("%s failed", (kind == 'o')?"Poweroff":"Reboot");
	}
	}

	exit(1);
	}

	void
	do_crashdump(void)
	{
	do_exit('c', true);
	}

	void
	do_reset(void)
	{
	do_exit('b', true);
	}

	void
	do_off(void)
	{
	do_exit('o', true);
	}

	void
	do_timeout_action(void)
	{
	do_exit(timeout_sysrq_char, do_flush);
	}

	/*
	* Change directory to the directory our core file needs to go in
	* Call after you establish the userid you're running under.
	*/
	int
	sbd_cdtocoredir(void)
	{
	int rc;
	static const char *dir = NULL;

	if (dir == NULL) {
	dir = CRM_CORE_DIR;
	}
	if ((rc=chdir(dir)) < 0) {
	int errsave = errno;
	cl_perror("Cannot chdir to [%s]", dir);
	errno = errsave;
	}
	return rc;
	}

	pid_t
	make_daemon(void)
	{
	pid_t pid;
	const char * devnull = "/dev/null";

	pid = fork();
	if (pid < 0) {
	cl_log(LOG_ERR, "%s: could not start daemon\n",
	cmdname);
	cl_perror("fork");
	exit(1);
	}else if (pid > 0) {
	return pid;
	}

	qb_log_ctl(QB_LOG_STDERR, QB_LOG_CONF_ENABLED, QB_FALSE);

	/* This is the child; ensure privileges have not been lost. */
	maximize_priority();
	sysrq_init();

	umask(022);
	close(0);
	(void)open(devnull, O_RDONLY);
	close(1);
	(void)open(devnull, O_WRONLY);
	close(2);
	(void)open(devnull, O_WRONLY);
	sbd_cdtocoredir();
	return 0;
	}

	void
	sbd_get_uname(void)
	{
	struct utsname uname_buf;
	int i;

	if (uname(&uname_buf) < 0) {
	cl_perror("uname() failed?");
	exit(1);
	}

	local_uname = strdup(uname_buf.nodename);

	for (i = 0; i < strlen(local_uname); i++)
	local_uname[i] = tolower(local_uname[i]);
	}


	#define FMT_MAX 256
	void
	sbd_set_format_string(int method, const char *daemon)
	{
	int offset = 0;
	char fmt[FMT_MAX];
	struct utsname res;

	switch(method) {
	case QB_LOG_STDERR:
	break;

	case QB_LOG_SYSLOG:
	if(daemon && strcmp(daemon, "sbd") != 0) {
	offset += snprintf(fmt + offset, FMT_MAX - offset, "%10s: ", daemon);
	}
	break;

	default:
	/* When logging to a file */
	if (uname(&res) == 0) {
	offset +=
	snprintf(fmt + offset, FMT_MAX - offset, "%%t [%d] %s %10s: ", getpid(),
	res.nodename, daemon);
	} else {
	offset += snprintf(fmt + offset, FMT_MAX - offset, "%%t [%d] %10s: ", getpid(), daemon);
	}
	}

	if (debug && method >= QB_LOG_STDERR) {
	offset += snprintf(fmt + offset, FMT_MAX - offset, "(%%-12f:%%5l %%g) %%-7p: %%n: ");
	} else {
	offset += snprintf(fmt + offset, FMT_MAX - offset, "%%g %%-7p: %%n: ");
	}

	if (method == QB_LOG_SYSLOG) {
	offset += snprintf(fmt + offset, FMT_MAX - offset, "%%b");
	} else {
	offset += snprintf(fmt + offset, FMT_MAX - offset, "\t%%b");
	}

	if(offset > 0) {
	qb_log_format_set(method, fmt);
	}
	}

	+int sigqueue_zero(pid_t pid, int sig)
	+{
	+union sigval signal_value;
	+
	+ memset(&signal_value, 0, sizeof(signal_value));
	+
	+ return sigqueue(pid, sig, signal_value);
	+}
	+
	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_timeout_action();
	}

	switch (servant_health) {
	case pcmk_health_pending:
	case pcmk_health_shutdown:
	case pcmk_health_transient:
	DBGLOG(LOG_DEBUG, "Not notifying parent: state transient (%d)", servant_health);
	break;

	case pcmk_health_unknown:
	case pcmk_health_unclean:
	case pcmk_health_noquorum:
	DBGLOG(LOG_WARNING, "Notifying parent: UNHEALTHY (%d)", servant_health);
	- sigqueue(ppid, SIG_PCMK_UNHEALTHY, signal_value);
	+ sigqueue_zero(ppid, SIG_PCMK_UNHEALTHY);
	break;

	case pcmk_health_online:
	DBGLOG(LOG_DEBUG, "Notifying parent: healthy");
	- sigqueue(ppid, SIG_LIVENESS, signal_value);
	+ sigqueue_zero(ppid, SIG_LIVENESS);
	break;

	default:
	DBGLOG(LOG_WARNING, "Notifying parent: UNHEALTHY %d", servant_health);
	- sigqueue(ppid, SIG_PCMK_UNHEALTHY, signal_value);
	+ sigqueue_zero(ppid, SIG_PCMK_UNHEALTHY);
	break;
	}
	}

	void
	set_servant_health(enum pcmk_health state, int level, char const *format, ...)
	{
	if (servant_health != state) {
	va_list ap;
	int len = 0;
	char *string = NULL;

	servant_health = state;

	va_start(ap, format);
	len = vasprintf (&string, format, ap);

	if(len > 0) {
	cl_log(level, "%s", string);
	}

	va_end(ap);
	free(string);
	}
	}

	bool
	sbd_is_disk(struct servants_list_item *servant)
	{
	if ((servant != NULL) &&
	(servant->devname != NULL) &&
	(servant->devname[0] == '/')) {
	return true;
	}
	return false;
	}

	bool
	sbd_is_cluster(struct servants_list_item *servant)
	{
	if ((servant != NULL) &&
	(servant->devname != NULL) &&
	(strcmp("cluster", servant->devname) == 0)) {
	return true;
	}
	return false;
	}

	bool
	sbd_is_pcmk(struct servants_list_item *servant)
	{
	if ((servant != NULL) &&
	(servant->devname != NULL) &&
	(strcmp("pcmk", servant->devname) == 0)) {
	return true;
	}
	return false;
	}
	diff --git a/src/sbd-inquisitor.c b/src/sbd-inquisitor.c
	index d917cd1..051801b 100644
	--- a/src/sbd-inquisitor.c
	+++ b/src/sbd-inquisitor.c
	@@ -1,1408 +1,1405 @@
	/*
	* 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 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 program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#include <crm/common/util.h>
	#include "sbd.h"
	#define LOCKSTRLEN 11

	static struct servants_list_item *servants_leader = NULL;

	int disk_priority = 1;
	int check_pcmk = 1;
	int check_cluster = 1;
	int has_check_pcmk_env = false;
	int disk_count = 0;
	int servant_count = 0;
	int servant_restart_interval = 5;
	int servant_restart_count = 1;
	int start_mode = 0;
	char* pidfile = NULL;
	bool do_flush = true;
	char timeout_sysrq_char = 'b';
	bool move_to_root_cgroup = true;
	bool enforce_moving_to_root_cgroup = false;
	bool sync_resource_startup = false;

	int parse_device_line(const char *line);

	static int
	sanitize_numeric_option_value(const char *value)
	{
	char *end = NULL;
	long int result = -1;

	if (value == NULL) {
	return -1;
	}

	errno = 0;

	result = strtol(value, &end, 10);
	if (result <= INT_MIN \|\| result >= INT_MAX \|\| errno != 0) {
	result = -1;
	} else if (*end != '\0') {
	result = -1;
	}

	return (int)result;
	}

	static const char *
	sanitize_option_value(const char *value)
	{
	size_t max = 0;
	size_t lpc = 0;

	if (value == NULL) {
	return NULL;
	}

	max = strlen(value);

	for (lpc = 0; lpc < max; lpc++) {
	if (!isspace(value[lpc])) {
	break;
	}
	}

	return (strlen(value + lpc) > 0 ? (value + lpc) : NULL);
	}

	static const char *
	get_env_option(const char *option)
	{
	const char *value = getenv(option);

	return sanitize_option_value(value);
	}

	static int
	recruit_servant(const char *devname, pid_t pid)
	{
	struct servants_list_item *s = servants_leader;
	struct servants_list_item *newbie;

	if (lookup_servant_by_dev(devname)) {
	cl_log(LOG_DEBUG, "Servant %s already exists", devname);
	return 0;
	}

	newbie = malloc(sizeof(*newbie));
	if (newbie) {
	memset(newbie, 0, sizeof(*newbie));
	newbie->devname = strdup(devname);
	newbie->pid = pid;
	newbie->first_start = 1;
	}
	if (!newbie \|\| !newbie->devname) {
	fprintf(stderr, "heap allocation failed in recruit_servant.\n");
	exit(1);
	}

	/* some sanity-check on our newbie */
	if (sbd_is_disk(newbie)) {
	cl_log(LOG_INFO, "Monitoring %s", devname);
	disk_count++;
	} else if (sbd_is_pcmk(newbie) \|\| sbd_is_cluster(newbie)) {
	/* alive just after pcmk and cluster servants have shown up */
	newbie->outdated = 1;
	} else {
	/* toss our newbie */
	cl_log(LOG_ERR, "Refusing to recruit unrecognized servant %s", devname);
	free((void *) newbie->devname);
	free(newbie);
	return -1;
	}

	if (!s) {
	servants_leader = newbie;
	} else {
	while (s->next)
	s = s->next;
	s->next = newbie;
	}

	servant_count++;

	return 0;
	}

	int assign_servant(const char* devname, functionp_t functionp, int mode, const void* argp)
	{
	pid_t pid = 0;
	int rc = 0;

	pid = fork();
	if (pid == 0) { /* child */
	maximize_priority();
	sbd_set_format_string(QB_LOG_SYSLOG, devname);
	rc = (*functionp)(devname, mode, 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);
	}
	}

	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 (strcasecmp(s->devname, devname) == 0)
	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);
	+ r = sigqueue_zero(s->pid, 0);
	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);
	+ r = sigqueue_zero(s->pid, 0);
	if ((r != -1 \|\| errno != ESRCH))
	return;
	}
	s->restarts++;
	if (sbd_is_disk(s)) {
	#if SUPPORT_SHARED_DISK
	DBGLOG(LOG_INFO, "Starting servant for device %s", s->devname);
	s->pid = assign_servant(s->devname, servant_md, start_mode, s);
	#else
	cl_log(LOG_ERR, "Shared disk functionality not supported");
	return;
	#endif
	} else if(sbd_is_pcmk(s)) {
	DBGLOG(LOG_INFO, "Starting Pacemaker servant");
	s->pid = assign_servant(s->devname, servant_pcmk, start_mode, NULL);

	} else if(sbd_is_cluster(s)) {
	DBGLOG(LOG_INFO, "Starting Cluster servant");
	s->pid = assign_servant(s->devname, servant_cluster, start_mode, NULL);

	} else {
	cl_log(LOG_ERR, "Unrecognized servant: %s", s->devname);
	}

	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);
	+ if (s->pid != 0) {
	+ sigqueue_zero(s->pid, SIGKILL);
	+ }
	}
	}

	static 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);
	+ sigqueue_zero(ppid, SIG_LIVENESS);
	}
	return 0;
	}

	static int sbd_lock_running(long pid)
	{
	int rc = 0;
	long mypid;
	int running = 0;
	char proc_path[PATH_MAX], exe_path[PATH_MAX], myexe_path[PATH_MAX];

	/* check if pid is running */
	if (kill(pid, 0) < 0 && errno == ESRCH) {
	goto bail;
	}

	#ifndef HAVE_PROC_PID
	return 1;
	#endif

	/* check to make sure pid hasn't been reused by another process */
	snprintf(proc_path, sizeof(proc_path), "/proc/%lu/exe", pid);
	rc = readlink(proc_path, exe_path, PATH_MAX-1);
	if(rc < 0) {
	cl_perror("Could not read from %s", proc_path);
	goto bail;
	}
	exe_path[rc] = 0;
	mypid = (unsigned long) getpid();
	snprintf(proc_path, sizeof(proc_path), "/proc/%lu/exe", mypid);
	rc = readlink(proc_path, myexe_path, PATH_MAX-1);
	if(rc < 0) {
	cl_perror("Could not read from %s", proc_path);
	goto bail;
	}
	myexe_path[rc] = 0;

	if(strcmp(exe_path, myexe_path) == 0) {
	running = 1;
	}

	bail:
	return running;
	}

	static int
	sbd_lock_pidfile(const char *filename)
	{
	char lf_name[256], tf_name[256], buf[LOCKSTRLEN+1];
	int fd;
	long pid, mypid;
	int rc;
	struct stat sbuf;

	if (filename == NULL) {
	errno = EFAULT;
	return -1;
	}

	mypid = (unsigned long) getpid();
	snprintf(lf_name, sizeof(lf_name), "%s",filename);
	snprintf(tf_name, sizeof(tf_name), "%s.%lu",
	filename, mypid);

	if ((fd = open(lf_name, O_RDONLY)) >= 0) {
	if (fstat(fd, &sbuf) >= 0 && sbuf.st_size < LOCKSTRLEN) {
	sleep(1); /* if someone was about to create one,
	* give'm a sec to do so
	* Though if they follow our protocol,
	* this won't happen. They should really
	* put the pid in, then link, not the
	* other way around.
	*/
	}
	if (read(fd, buf, sizeof(buf)) < 1) {
	/* lockfile empty -> rm it and go on */;
	} else {
	if (sscanf(buf, "%ld", &pid) < 1) {
	/* lockfile screwed up -> rm it and go on */
	} else {
	if (pid > 1 && (getpid() != pid)
	&& sbd_lock_running(pid)) {
	/* is locked by existing process
	* -> give up */
	close(fd);
	return -1;
	} else {
	/* stale lockfile -> rm it and go on */
	}
	}
	}
	unlink(lf_name);
	close(fd);
	}
	if ((fd = open(tf_name, O_CREAT \| O_WRONLY \| O_EXCL, 0644)) < 0) {
	/* Hmmh, why did we fail? Anyway, nothing we can do about it */
	return -3;
	}

	/* Slight overkill with the %d format ;-) /
	snprintf(buf, sizeof(buf), "%*lu\n", LOCKSTRLEN-1, mypid);

	if (write(fd, buf, LOCKSTRLEN) != LOCKSTRLEN) {
	/* Again, nothing we can do about this */
	rc = -3;
	close(fd);
	goto out;
	}
	close(fd);

	switch (link(tf_name, lf_name)) {
	case 0:
	if (stat(tf_name, &sbuf) < 0) {
	/* something weird happened */
	rc = -3;
	break;
	}
	if (sbuf.st_nlink < 2) {
	/* somehow, it didn't get through - NFS trouble? */
	rc = -2;
	break;
	}
	rc = 0;
	break;
	case EEXIST:
	rc = -1;
	break;
	default:
	rc = -3;
	}
	out:
	unlink(tf_name);
	return rc;
	}


	/*
	* Unlock a file (remove its lockfile)
	* do we need to check, if its (still) ours? No, IMHO, if someone else
	* locked our line, it's his fault -tho
	* returns 0 on success
	* <0 if some failure occured
	*/

	static int
	sbd_unlock_pidfile(const char *filename)
	{
	char lf_name[256];

	if (filename == NULL) {
	errno = EFAULT;
	return -1;
	}

	snprintf(lf_name, sizeof(lf_name), "%s", filename);

	return unlink(lf_name);
	}

	int cluster_alive(bool all)
	{
	int alive = 1;
	struct servants_list_item* s;

	if(servant_count == disk_count) {
	return 0;
	}

	for (s = servants_leader; s; s = s->next) {
	if (sbd_is_cluster(s) \|\| sbd_is_pcmk(s)) {
	if(s->outdated) {
	alive = 0;
	} else if(all == false) {
	return 1;
	}
	}
	}

	return alive;
	}

	int quorum_read(int good_servants)
	{
	if (disk_count > 2)
	return (good_servants > disk_count/2);
	else
	return (good_servants > 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 cluster_appeared = 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 %d IS ACTIVE - DO NOT RUN IN PRODUCTION!", debug_mode);
	}

	set_proc_title("sbd: inquisitor");

	if (pidfile) {
	if (sbd_lock_pidfile(pidfile) < 0) {
	exit(1);
	}
	}

	sigemptyset(&procmask);
	sigaddset(&procmask, SIGCHLD);
	sigaddset(&procmask, SIGTERM);
	sigaddset(&procmask, SIG_LIVENESS);
	sigaddset(&procmask, SIG_EXITREQ);
	sigaddset(&procmask, SIG_TEST);
	sigaddset(&procmask, SIG_PCMK_UNHEALTHY);
	sigaddset(&procmask, SIG_RESTART);
	sigaddset(&procmask, SIGUSR1);
	sigaddset(&procmask, SIGUSR2);
	sigprocmask(SIG_BLOCK, &procmask, NULL);

	servants_start();

	timeout.tv_sec = timeout_loop;
	timeout.tv_nsec = 0;
	clock_gettime(CLOCK_MONOTONIC, &t_last_tickle);

	while (1) {
	bool tickle = 0;
	bool can_detach = 0;
	int good_servants = 0;

	sig = sigtimedwait(&procmask, &sinfo, &timeout);

	clock_gettime(CLOCK_MONOTONIC, &t_now);

	if (sig == SIG_EXITREQ \|\| sig == SIGTERM) {
	servants_kill();
	watchdog_close(true);
	exiting = 1;
	} else if (sig == SIGCHLD) {
	while ((pid = waitpid(-1, &status, WNOHANG))) {
	if (pid == -1 && errno == ECHILD) {
	break;
	} else {
	s = lookup_servant_by_pid(pid);
	if (sbd_is_disk(s)) {
	if (WIFEXITED(status)) {
	switch(WEXITSTATUS(status)) {
	case EXIT_MD_SERVANT_IO_FAIL:
	DBGLOG(LOG_INFO, "Servant for %s requests to be disowned",
	s->devname);
	break;
	case EXIT_MD_SERVANT_REQUEST_RESET:
	cl_log(LOG_WARNING, "%s requested a reset", s->devname);
	do_reset();
	break;
	case EXIT_MD_SERVANT_REQUEST_SHUTOFF:
	cl_log(LOG_WARNING, "%s requested a shutoff", s->devname);
	do_off();
	break;
	case EXIT_MD_SERVANT_REQUEST_CRASHDUMP:
	cl_log(LOG_WARNING, "%s requested a crashdump", s->devname);
	do_crashdump();
	break;
	default:
	break;
	}
	}
	} else if (sbd_is_pcmk(s)) {
	if (WIFEXITED(status)) {
	switch(WEXITSTATUS(status)) {
	case EXIT_PCMK_SERVANT_GRACEFUL_SHUTDOWN:
	DBGLOG(LOG_INFO, "PCMK-Servant has exited gracefully");
	/* revert to state prior to pacemaker-detection */
	s->restarts = 0;
	s->restart_blocked = 0;
	cluster_appeared = 0;
	s->outdated = 1;
	s->t_last.tv_sec = 0;
	break;
	default:
	break;
	}
	}
	}
	cleanup_servant_by_pid(pid);
	}
	}
	} else if (sig == SIG_PCMK_UNHEALTHY) {
	s = lookup_servant_by_pid(sinfo.si_pid);
	if (sbd_is_cluster(s) \|\| sbd_is_pcmk(s)) {
	if (s->outdated == 0) {
	cl_log(LOG_WARNING, "%s health check: UNHEALTHY", s->devname);
	}
	s->t_last.tv_sec = 1;
	} else {
	cl_log(LOG_WARNING, "Ignoring SIG_PCMK_UNHEALTHY from unknown source");
	}
	} else if (sig == SIG_LIVENESS) {
	s = lookup_servant_by_pid(sinfo.si_pid);
	if (s) {
	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) {
	sbd_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 (sbd_is_disk(s)) {
	good_servants++;
	}
	if (s->outdated) {
	cl_log(LOG_NOTICE, "Servant %s is healthy (age: %d)", s->devname, age);
	}
	s->outdated = 0;

	} else if (!s->outdated) {
	if (!s->restart_blocked) {
	cl_log(LOG_WARNING, "Servant %s is outdated (age: %d)", s->devname, age);
	}
	s->outdated = 1;
	}
	}

	if(disk_count == 0) {
	/* NO disks, everything is up to the cluster */

	if(cluster_alive(true)) {
	/* We LIVE! */
	if(cluster_appeared == false) {
	cl_log(LOG_INFO, "Active cluster detected");
	}
	tickle = 1;
	can_detach = 1;
	cluster_appeared = 1;

	} else if(cluster_alive(false)) {
	if(!decoupled) {
	/* On the way up, detach and arm the watchdog */
	cl_log(LOG_INFO, "Partial cluster detected, detaching");
	}

	can_detach = 1;
	tickle = !cluster_appeared;

	} else if(!decoupled) {
	/* Stay alive until the cluster comes up */
	tickle = !cluster_appeared;
	}

	} else if(disk_priority == 1 \|\| servant_count == disk_count) {
	if (quorum_read(good_servants)) {
	/* There are disks and we're connected to the majority of them */
	tickle = 1;
	can_detach = 1;
	pcmk_override = 0;

	} else if (servant_count > disk_count && cluster_alive(true)) {
	tickle = 1;

	if(!pcmk_override) {
	cl_log(LOG_WARNING, "Majority of devices lost - surviving on pacemaker");
	pcmk_override = 1; /* Only log this message once */
	}
	}

	} else if(cluster_alive(true) && quorum_read(good_servants)) {
	/* Both disk and cluster servants are healthy */
	tickle = 1;
	can_detach = 1;
	cluster_appeared = 1;

	} else if(quorum_read(good_servants)) {
	/* The cluster takes priority but only once
	* connected for the first time.
	*
	* Until then, we tickle based on disk quorum.
	*/
	can_detach = 1;
	tickle = !cluster_appeared;
	}

	/* cl_log(LOG_DEBUG, "Tickle: q=%d, g=%d, p=%d, s=%d", */
	/* quorum_read(good_servants), good_servants, tickle, disk_count); */

	if(tickle) {
	watchdog_tickle();
	clock_gettime(CLOCK_MONOTONIC, &t_last_tickle);
	}

	if (!decoupled && can_detach) {
	/* We only do this at the point either the disk or
	* cluster servants become healthy
	*/
	cl_log(LOG_DEBUG, "Decoupling");
	if (inquisitor_decouple() < 0) {
	servants_kill();
	exiting = 1;
	continue;
	} else {
	decoupled = 1;
	}
	}

	/* 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_timeout_action();
	} 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 %ds exceeds watchdog warning timeout of %ds (healthy servants: %d)",
	(int)latency, (int)timeout_watchdog_warn, good_servants);

	if (debug_mode && watchdog_use) {
	/* In debug mode, trigger a reset before the watchdog can panic the machine */
	do_timeout_action();
	}
	}

	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);

	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
	parse_device_line(const char *line)
	{
	size_t lpc = 0;
	size_t last = 0;
	size_t max = 0;
	int found = 0;
	bool skip_space = true;
	int space_run = 0;

	if (!line) {
	return 0;
	}

	max = strlen(line);

	cl_log(LOG_DEBUG, "Processing %d bytes: [%s]", (int) max, line);

	for (lpc = 0; lpc <= max; lpc++) {
	if (isspace(line[lpc])) {
	if (skip_space) {
	last = lpc + 1;
	} else {
	space_run++;
	}
	continue;
	}
	skip_space = false;
	if (line[lpc] == ';' \|\| line[lpc] == 0) {
	int rc = 0;
	char *entry = calloc(1, 1 + lpc - last);

	if (entry) {
	rc = sscanf(line + last, "%[^;]", entry);
	} else {
	fprintf(stderr, "Heap allocation failed parsing device-line.\n");
	exit(1);
	}

	if (rc != 1) {
	cl_log(LOG_WARNING, "Could not parse: '%s'", line + last);
	} else {
	entry[strlen(entry)-space_run] = '\0';
	cl_log(LOG_DEBUG, "Adding '%s'", entry);
	if (recruit_servant(entry, 0) != 0) {
	free(entry);
	// sbd should refuse to start if any of the configured device names is invalid.
	return -1;
	}
	found++;
	}

	free(entry);
	skip_space = true;
	last = lpc + 1;
	}
	space_run = 0;
	}
	return found;
	}

	#define SBD_SOURCE_FILES "sbd-cluster.c,sbd-common.c,sbd-inquisitor.c,sbd-md.c,sbd-pacemaker.c,setproctitle.c"

	static void
	sbd_log_filter_ctl(const char *files, uint8_t priority)
	{
	if (files == NULL) {
	files = SBD_SOURCE_FILES;
	}

	qb_log_filter_ctl(QB_LOG_SYSLOG, QB_LOG_FILTER_ADD, QB_LOG_FILTER_FILE, files, priority);
	qb_log_filter_ctl(QB_LOG_STDERR, QB_LOG_FILTER_ADD, QB_LOG_FILTER_FILE, files, priority);
	}

	int
	arg_enabled(int arg_count)
	{
	return arg_count % 2;
	}

	int main(int argc, char argv, char envp)
	{
	int exit_status = 0;
	int c;
	int W_count = 0;
	int c_count = 0;
	int P_count = 0;
	int qb_facility;
	const char *value = NULL;
	bool delay_start = false;
	long delay = 0;
	char *timeout_action = NULL;

	if ((cmdname = strrchr(argv[0], '/')) == NULL) {
	cmdname = argv[0];
	} else {
	++cmdname;
	}

	watchdogdev = strdup("/dev/watchdog");
	watchdogdev_is_default = true;
	qb_facility = qb_log_facility2int("daemon");
	qb_log_init(cmdname, qb_facility, LOG_WARNING);
	sbd_set_format_string(QB_LOG_SYSLOG, "sbd");

	qb_log_ctl(QB_LOG_SYSLOG, QB_LOG_CONF_ENABLED, QB_TRUE);
	qb_log_ctl(QB_LOG_STDERR, QB_LOG_CONF_ENABLED, QB_FALSE);
	sbd_log_filter_ctl(NULL, LOG_NOTICE);

	sbd_get_uname();

	value = get_env_option("SBD_PACEMAKER");
	if(value) {
	check_pcmk = crm_is_true(value);
	check_cluster = crm_is_true(value);

	has_check_pcmk_env = true;
	}
	cl_log(LOG_INFO, "SBD_PACEMAKER set to: %d (%s)", (int)check_pcmk, value?value:"default");

	value = get_env_option("SBD_STARTMODE");
	if(value == NULL) {
	} else if(strcmp(value, "clean") == 0) {
	start_mode = 1;
	} else if(strcmp(value, "always") == 0) {
	start_mode = 0;
	}
	cl_log(LOG_INFO, "Start mode set to: %d (%s)", (int)start_mode, value?value:"default");

	value = get_env_option("SBD_WATCHDOG_DEV");
	if(value) {
	free(watchdogdev);
	watchdogdev = strdup(value);
	watchdogdev_is_default = false;
	}

	/* SBD_WATCHDOG has been dropped from sbd.sysconfig example.
	* This is for backward compatibility. */
	value = get_env_option("SBD_WATCHDOG");
	if(value) {
	watchdog_use = crm_is_true(value);
	}

	value = get_env_option("SBD_WATCHDOG_TIMEOUT");
	if(value) {
	timeout_watchdog = crm_get_msec(value) / 1000;
	}

	value = get_env_option("SBD_PIDFILE");
	if(value) {
	pidfile = strdup(value);
	cl_log(LOG_INFO, "pidfile set to %s", pidfile);
	}

	value = get_env_option("SBD_DELAY_START");
	if(value) {
	delay_start = crm_is_true(value);

	if (!delay_start) {
	delay = crm_get_msec(value) / 1000;
	if (delay > 0) {
	delay_start = true;
	}
	}
	}

	value = get_env_option("SBD_TIMEOUT_ACTION");
	if(value) {
	timeout_action = strdup(value);
	}

	value = get_env_option("SBD_MOVE_TO_ROOT_CGROUP");
	if(value) {
	move_to_root_cgroup = crm_is_true(value);

	if (move_to_root_cgroup) {
	enforce_moving_to_root_cgroup = true;
	} else {
	if (strcmp(value, "auto") == 0) {
	move_to_root_cgroup = true;
	}
	}
	}

	while ((c = getopt(argc, argv, "czC:DPRTWZhvw:d:n:p:1:2:3:4:5:t:I:F:S:s:r:")) != -1) {
	int sanitized_num_optarg = 0;
	/* Call it before checking optarg for NULL to make coverity happy */
	const char *sanitized_optarg = sanitize_option_value(optarg);

	if (optarg && ((sanitized_optarg == NULL) \|\|
	(strchr("SsC12345tIF", c) &&
	(sanitized_num_optarg = sanitize_numeric_option_value(sanitized_optarg)) < 0))) {
	fprintf(stderr, "Invalid value \"%s\" for option -%c\n", optarg, c);
	exit_status = -2;
	goto out;
	}

	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 = sanitized_num_optarg;
	cl_log(LOG_INFO, "Start mode set to: %d", (int)start_mode);
	break;
	case 's':
	timeout_startup = sanitized_num_optarg;
	cl_log(LOG_INFO, "Start timeout set to: %d", (int)timeout_startup);
	break;
	case 'v':
	debug++;
	if(debug == 1) {
	sbd_log_filter_ctl(NULL, LOG_INFO);
	cl_log(LOG_INFO, "Verbose mode enabled.");

	} else if(debug == 2) {
	sbd_log_filter_ctl(NULL, LOG_DEBUG);
	cl_log(LOG_INFO, "Debug mode enabled.");

	} else if(debug == 3) {
	/* Go nuts, turn on pacemaker's logging too */
	sbd_log_filter_ctl("*", LOG_DEBUG);
	cl_log(LOG_INFO, "Debug library mode enabled.");
	}
	break;
	case 'T':
	watchdog_set_timeout = 0;
	cl_log(LOG_INFO, "Setting watchdog timeout disabled; using defaults.");
	break;
	case 'W':
	W_count++;
	break;
	case 'w':
	free(watchdogdev);
	watchdogdev = strdup(sanitized_optarg);
	watchdogdev_is_default = false;
	cl_log(LOG_NOTICE, "Using watchdog device '%s'", watchdogdev);
	break;
	case 'd':
	#if SUPPORT_SHARED_DISK
	if (recruit_servant(sanitized_optarg, 0) != 0) {
	fprintf(stderr, "Invalid device: %s\n", optarg);
	exit_status = -1;
	goto out;
	}
	#else
	fprintf(stderr, "Shared disk functionality not supported\n");
	exit_status = -2;
	goto out;
	#endif
	break;
	case 'c':
	c_count++;
	break;
	case 'P':
	P_count++;
	break;
	case 'z':
	disk_priority = 0;
	break;
	case 'n':
	local_uname = strdup(sanitized_optarg);
	cl_log(LOG_INFO, "Overriding local hostname to %s", local_uname);
	break;
	case 'p':
	pidfile = strdup(sanitized_optarg);
	cl_log(LOG_INFO, "pidfile set to %s", pidfile);
	break;
	case 'C':
	timeout_watchdog_crashdump = sanitized_num_optarg;
	cl_log(LOG_INFO, "Setting crashdump watchdog timeout to %d",
	(int)timeout_watchdog_crashdump);
	break;
	case '1':
	timeout_watchdog = sanitized_num_optarg;
	break;
	case '2':
	timeout_allocate = sanitized_num_optarg;
	break;
	case '3':
	timeout_loop = sanitized_num_optarg;
	break;
	case '4':
	timeout_msgwait = sanitized_num_optarg;
	break;
	case '5':
	timeout_watchdog_warn = sanitized_num_optarg;
	do_calculate_timeout_watchdog_warn = false;
	cl_log(LOG_INFO, "Setting latency warning to %d",
	(int)timeout_watchdog_warn);
	break;
	case 't':
	servant_restart_interval = sanitized_num_optarg;
	cl_log(LOG_INFO, "Setting servant restart interval to %d",
	(int)servant_restart_interval);
	break;
	case 'I':
	timeout_io = sanitized_num_optarg;
	cl_log(LOG_INFO, "Setting IO timeout to %d",
	(int)timeout_io);
	break;
	case 'F':
	servant_restart_count = sanitized_num_optarg;
	cl_log(LOG_INFO, "Servant restart count set to %d",
	(int)servant_restart_count);
	break;
	case 'r':
	if (timeout_action) {
	free(timeout_action);
	}
	timeout_action = strdup(sanitized_optarg);
	break;
	case 'h':
	usage();
	goto out;
	break;
	default:
	exit_status = -2;
	goto out;
	break;
	}
	}

	if (disk_count == 0) {
	/* if we already have disks from commandline
	then it is probably undesirable to add those
	from environment (general rule cmdline has precedence)
	*/
	value = get_env_option("SBD_DEVICE");
	if ((value) && strlen(value)) {
	#if SUPPORT_SHARED_DISK
	int devices = parse_device_line(value);
	if(devices < 1) {
	fprintf(stderr, "Invalid device line: %s\n", value);
	exit_status = -1;
	goto out;
	}
	#else
	fprintf(stderr, "Shared disk functionality not supported\n");
	exit_status = -2;
	goto out;
	#endif
	}
	}

	if (watchdogdev == NULL \|\| strcmp(watchdogdev, "/dev/null") == 0) {
	watchdog_use = 0;

	} else if (W_count > 0) {
	watchdog_use = arg_enabled(W_count);
	}

	if (watchdog_use) {
	cl_log(LOG_INFO, "Watchdog enabled.");
	} else {
	cl_log(LOG_INFO, "Watchdog disabled.");
	}

	if (c_count > 0) {
	check_cluster = arg_enabled(c_count);
	}

	if (P_count > 0) {
	int check_pcmk_arg = arg_enabled(P_count);

	if (has_check_pcmk_env && check_pcmk_arg != check_pcmk) {
	cl_log(LOG_WARNING, "Pacemaker integration is %s: "
	"SBD_PACEMAKER=%s is overridden by %s option. "
	"It's recommended to only use SBD_PACEMAKER.",
	check_pcmk_arg? "enabled" : "disabled",
	check_pcmk? "yes" : "no",
	check_pcmk_arg? "-P" : "-PP");
	}
	check_pcmk = check_pcmk_arg;
	}

	if ((disk_count > 0) && (strlen(local_uname) > SECTOR_NAME_MAX)) {
	fprintf(stderr, "Node name mustn't be longer than %d chars.\n",
	SECTOR_NAME_MAX);
	fprintf(stderr, "If uname is longer define a name to be used by sbd.\n");
	exit_status = -1;
	goto out;
	}

	if (disk_count > 3) {
	fprintf(stderr, "You can specify up 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;
	}

	if (timeout_action) {
	char *p[2];
	int i;
	char c;
	int nrflags = sscanf(timeout_action, "%m[a-z],%m[a-z]%c", &p[0], &p[1], &c);
	bool parse_error = (nrflags < 1) \|\| (nrflags > 2);

	for (i = 0; (i < nrflags) && (i < 2); i++) {
	if (!strcmp(p[i], "reboot")) {
	timeout_sysrq_char = 'b';
	} else if (!strcmp(p[i], "crashdump")) {
	timeout_sysrq_char = 'c';
	} else if (!strcmp(p[i], "off")) {
	timeout_sysrq_char = 'o';
	} else if (!strcmp(p[i], "flush")) {
	do_flush = true;
	} else if (!strcmp(p[i], "noflush")) {
	do_flush = false;
	} else {
	parse_error = true;
	}
	free(p[i]);
	}
	if (parse_error) {
	fprintf(stderr, "Failed to parse timeout-action \"%s\".\n",
	timeout_action);
	exit_status = -1;
	goto out;
	}
	}

	if (strcmp(argv[optind], "watch") == 0) {
	value = get_env_option("SBD_SYNC_RESOURCE_STARTUP");
	sync_resource_startup =
	crm_is_true(value?value:SBD_SYNC_RESOURCE_STARTUP_DEFAULT);

	#if !USE_PACEMAKERD_API
	if (sync_resource_startup) {
	fprintf(stderr, "Failed to sync resource-startup as "
	"SBD was built against pacemaker not supporting pacemakerd-API.\n");
	exit_status = -1;
	goto out;
	}
	#else
	if (check_pcmk && !sync_resource_startup) {
	cl_log(LOG_WARNING, "SBD built against pacemaker supporting "
	"pacemakerd-API. Should think about enabling "
	"SBD_SYNC_RESOURCE_STARTUP.");

	} else if (!check_pcmk && sync_resource_startup) {
	fprintf(stderr, "Set SBD_PACEMAKER=yes to allow resource startup syncing. "
	"Otherwise explicitly set SBD_SYNC_RESOURCE_STARTUP=no if to intentionally disable.\n");
	exit_status = -1;
	goto out;
	}
	#endif
	}

	#if SUPPORT_SHARED_DISK
	if (strcmp(argv[optind], "create") == 0) {
	exit_status = init_devices(servants_leader);

	} else if (strcmp(argv[optind], "dump") == 0) {
	exit_status = dump_headers(servants_leader);

	} else if (strcmp(argv[optind], "allocate") == 0) {
	exit_status = allocate_slots(argv[optind + 1], servants_leader);

	} else if (strcmp(argv[optind], "list") == 0) {
	exit_status = list_slots(servants_leader);

	} else if (strcmp(argv[optind], "message") == 0) {
	exit_status = messenger(argv[optind + 1], argv[optind + 2], servants_leader);

	} else if (strcmp(argv[optind], "ping") == 0) {
	exit_status = ping_via_slots(argv[optind + 1], servants_leader);

	} else
	#endif
	if (strcmp(argv[optind], "query-watchdog") == 0) {
	exit_status = watchdog_info();
	} else if (strcmp(argv[optind], "test-watchdog") == 0) {
	exit_status = watchdog_test();
	} else if (strcmp(argv[optind], "watch") == 0) {
	/* sleep $(sbd $SBD_DEVICE_ARGS dump \| grep -m 1 msgwait \| awk '{print $4}') 2>/dev/null */

	const char *delay_source = delay ? "SBD_DELAY_START" : "";

	#if SUPPORT_SHARED_DISK
	if(disk_count > 0) {
	/* If no devices are specified, its not an error to be unable to find one */
	open_any_device(servants_leader);

	if (delay_start && delay <= 0) {
	delay = get_first_msgwait(servants_leader);

	if (delay > 0) {
	delay_source = "msgwait";
	} else {
	cl_log(LOG_WARNING, "No 'msgwait' value from disk, using '2 * watchdog-timeout' for 'delay' starting");
	}
	}
	}
	#endif
	/* Re-calculate timeout_watchdog_warn based on any timeout_watchdog from:
	* SBD_WATCHDOG_TIMEOUT, -1 option or on-disk setting read with open_any_device() */
	if (do_calculate_timeout_watchdog_warn) {
	timeout_watchdog_warn = calculate_timeout_watchdog_warn(timeout_watchdog);
	}

	if (delay_start) {
	/* diskless mode or disk read issues causing get_first_msgwait() to return a 0 for delay */
	if (delay <= 0) {
	delay = 2 * timeout_watchdog;
	delay_source = "watchdog-timeout * 2";
	}

	cl_log(LOG_DEBUG, "Delay start (yes), (delay: %ld), (delay source: %s)", delay, delay_source);

	sleep((unsigned long) delay);

	} else {
	cl_log(LOG_DEBUG, "Delay start (no)");
	}

	/* We only want this to have an effect during watch right now;
	* pinging and fencing would be too confused */
	cl_log(LOG_INFO, "Turning on pacemaker checks: %d", check_pcmk);
	if (check_pcmk) {
	recruit_servant("pcmk", 0);
	#if SUPPORT_PLUGIN
	check_cluster = 1;
	#endif
	}

	cl_log(LOG_INFO, "Turning on cluster checks: %d", check_cluster);
	if (check_cluster) {
	recruit_servant("cluster", 0);
	}

	cl_log(LOG_NOTICE, "%s flush + write \'%c\' to sysrq in case of timeout",
	do_flush?"Do":"Skip", timeout_sysrq_char);
	exit_status = inquisitor();
	} else {
	exit_status = -2;
	}

	out:
	if (timeout_action) {
	free(timeout_action);
	}
	if (exit_status < 0) {
	if (exit_status == -2) {
	usage();
	} else {
	fprintf(stderr, "sbd failed; please check the logs.\n");
	}
	return (1);
	}
	return (0);
	}
	diff --git a/src/sbd-md.c b/src/sbd-md.c
	index 2a237ad..71c317f 100644
	--- a/src/sbd-md.c
	+++ b/src/sbd-md.c
	@@ -1,1288 +1,1285 @@
	/*
	* 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 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 program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#include "sbd.h"

	#define SBD_MSG_EMPTY 0x00
	#define SBD_MSG_TEST 0x01
	#define SBD_MSG_RESET 0x02
	#define SBD_MSG_OFF 0x03
	#define SBD_MSG_EXIT 0x04
	#define SBD_MSG_CRASHDUMP 0x05

	#define SLOT_TO_SECTOR(slot) (1+slot*2)
	#define MBOX_TO_SECTOR(mbox) (2+mbox*2)

	extern int disk_count;

	/* These have to match the values in the header of the partition */
	static char sbd_magic[8] = "SBD_SBD_";
	static char sbd_version = 0x02;

	struct slot_msg_arg_t {
	const char* name;
	const char* msg;
	};

	static signed char
	cmd2char(const char *cmd)
	{
	if (strcmp("clear", cmd) == 0) {
	return SBD_MSG_EMPTY;
	} else if (strcmp("test", cmd) == 0) {
	return SBD_MSG_TEST;
	} else if (strcmp("reset", cmd) == 0) {
	return SBD_MSG_RESET;
	} else if (strcmp("off", cmd) == 0) {
	return SBD_MSG_OFF;
	} else if (strcmp("exit", cmd) == 0) {
	return SBD_MSG_EXIT;
	} else if (strcmp("crashdump", cmd) == 0) {
	return SBD_MSG_CRASHDUMP;
	}
	return -1;
	}

	static const char*
	char2cmd(const char cmd)
	{
	switch (cmd) {
	case SBD_MSG_EMPTY:
	return "clear";
	break;
	case SBD_MSG_TEST:
	return "test";
	break;
	case SBD_MSG_RESET:
	return "reset";
	break;
	case SBD_MSG_OFF:
	return "off";
	break;
	case SBD_MSG_EXIT:
	return "exit";
	break;
	case SBD_MSG_CRASHDUMP:
	return "crashdump";
	break;
	default:
	return "undefined";
	break;
	}
	}

	static void
	close_device(struct sbd_context *st)
	{
	if (!st) {
	return;
	}
	if (st->ioctx) {
	io_destroy(st->ioctx);
	}
	if (st->devfd >= 0) {
	close(st->devfd);
	}
	free(st->buffer);
	free(st);
	}

	static struct sbd_context *
	open_device(const char* devname, int loglevel)
	{
	struct sbd_context *st;

	if (!devname)
	return NULL;

	st = calloc(1, sizeof(struct sbd_context));
	if (!st) {
	return NULL;
	}
	st->devfd = -1;

	if (io_setup(1, &st->ioctx) != 0) {
	cl_perror("io_setup failed");
	goto out;
	}

	st->devfd = open(devname, O_SYNC\|O_RDWR\|O_DIRECT);

	if (st->devfd == -1) {
	if (loglevel == LOG_DEBUG) {
	DBGLOG(loglevel, "Opening device %s failed.", devname);
	} else {
	cl_log(loglevel, "Opening device %s failed.", devname);
	}
	goto out;
	}

	ioctl(st->devfd, BLKSSZGET, &sector_size);

	if (sector_size == 0) {
	cl_perror("Get sector size failed.\n");
	goto out;
	}

	if (posix_memalign(&st->buffer, sector_size, sector_size)) {
	cl_perror("Couldn't allocate sector-buffer.");
	goto out;
	}

	return st;

	out:
	close_device(st);
	return NULL;
	}

	static void *
	sector_alloc(void)
	{
	void *x;

	x = calloc(1, sector_size);
	if (!x) {
	exit(1);
	}

	return x;
	}

	static int
	sector_io(struct sbd_context st, int sector, void data, int rw)
	{
	struct timespec timeout;
	struct io_event event;
	struct iocb *ios[1] = { &st->io };
	long r;

	timeout.tv_sec = timeout_io;
	timeout.tv_nsec = 0;

	memset(&st->io, 0, sizeof(struct iocb));
	if (rw) {
	memcpy(st->buffer, data, sector_size);
	io_prep_pwrite(&st->io, st->devfd, st->buffer, sector_size, (long long) sector_size * sector);
	} else {
	memset(st->buffer, 0, sector_size);
	io_prep_pread(&st->io, st->devfd, st->buffer, sector_size, (long long) sector_size * sector);
	}

	if (io_submit(st->ioctx, 1, ios) != 1) {
	cl_log(LOG_ERR, "Failed to submit IO request! (rw=%d)", rw);
	return -1;
	}

	errno = 0;
	r = io_getevents(st->ioctx, 1L, 1L, &event, &timeout);

	if (r < 0 ) {
	cl_log(LOG_ERR, "Failed to retrieve IO events (rw=%d)", rw);
	return -1;
	} else if (r < 1L) {
	cl_log(LOG_INFO, "Cancelling IO request due to timeout (rw=%d, r=%ld)", rw, r);
	r = io_cancel(st->ioctx, ios[0], &event);
	if (r) {
	DBGLOG(LOG_INFO, "Could not cancel IO request (rw=%d)", rw);
	/* Doesn't really matter, debugging information.
	*/
	}
	return -1;
	} else if (r > 1L) {
	cl_log(LOG_ERR, "More than one IO was returned (r=%ld)", r);
	return -1;
	}


	/* IO is happy */
	if (event.res == sector_size) {
	if (!rw) {
	memcpy(data, st->buffer, sector_size);
	}
	return 0;
	} else {
	cl_log(LOG_ERR, "Short IO (rw=%d, res=%lu, sector_size=%d)",
	rw, event.res, sector_size);
	return -1;
	}
	}

	static int
	sector_write(struct sbd_context st, int sector, void data)
	{
	return sector_io(st, sector, data, 1);
	}

	static int
	sector_read(struct sbd_context st, int sector, void data)
	{
	return sector_io(st, sector, data, 0);
	}

	static int
	slot_read(struct sbd_context st, int slot, struct sector_node_s s_node)
	{
	return sector_read(st, SLOT_TO_SECTOR(slot), s_node);
	}

	static int
	slot_write(struct sbd_context st, int slot, struct sector_node_s s_node)
	{
	return sector_write(st, SLOT_TO_SECTOR(slot), s_node);
	}

	static int
	mbox_write(struct sbd_context st, int mbox, struct sector_mbox_s s_mbox)
	{
	return sector_write(st, MBOX_TO_SECTOR(mbox), s_mbox);
	}

	static int
	mbox_read(struct sbd_context st, int mbox, struct sector_mbox_s s_mbox)
	{
	return sector_read(st, MBOX_TO_SECTOR(mbox), s_mbox);
	}

	static int
	mbox_write_verify(struct sbd_context st, int mbox, struct sector_mbox_s s_mbox)
	{
	void *data;
	int rc = 0;

	if (sector_write(st, MBOX_TO_SECTOR(mbox), s_mbox) < 0)
	return -1;

	data = sector_alloc();
	if (sector_read(st, MBOX_TO_SECTOR(mbox), data) < 0) {
	rc = -1;
	goto out;
	}


	if (memcmp(s_mbox, data, sector_size) != 0) {
	cl_log(LOG_ERR, "Write verification failed!");
	rc = -1;
	goto out;
	}
	rc = 0;
	out:
	free(data);
	return rc;
	}

	static int header_write(struct sbd_context st, struct sector_header_s s_header)
	{
	s_header->sector_size = htonl(s_header->sector_size);
	s_header->timeout_watchdog = htonl(s_header->timeout_watchdog);
	s_header->timeout_allocate = htonl(s_header->timeout_allocate);
	s_header->timeout_loop = htonl(s_header->timeout_loop);
	s_header->timeout_msgwait = htonl(s_header->timeout_msgwait);
	return sector_write(st, 0, s_header);
	}

	static int
	header_read(struct sbd_context st, struct sector_header_s s_header)
	{
	if (sector_read(st, 0, s_header) < 0)
	return -1;

	s_header->sector_size = ntohl(s_header->sector_size);
	s_header->timeout_watchdog = ntohl(s_header->timeout_watchdog);
	s_header->timeout_allocate = ntohl(s_header->timeout_allocate);
	s_header->timeout_loop = ntohl(s_header->timeout_loop);
	s_header->timeout_msgwait = ntohl(s_header->timeout_msgwait);
	/* This sets the global defaults: */
	timeout_watchdog = s_header->timeout_watchdog;
	timeout_allocate = s_header->timeout_allocate;
	timeout_loop = s_header->timeout_loop;
	timeout_msgwait = s_header->timeout_msgwait;

	return 0;
	}

	static int
	valid_header(const struct sector_header_s *s_header)
	{
	if (memcmp(s_header->magic, sbd_magic, sizeof(s_header->magic)) != 0) {
	cl_log(LOG_ERR, "Header magic does not match.");
	return -1;
	}
	if (s_header->version != sbd_version) {
	cl_log(LOG_ERR, "Header version does not match.");
	return -1;
	}
	if (s_header->sector_size != sector_size) {
	cl_log(LOG_ERR, "Header sector size does not match.");
	return -1;
	}
	return 0;
	}

	static struct sector_header_s *
	header_get(struct sbd_context *st)
	{
	struct sector_header_s *s_header;
	s_header = sector_alloc();

	if (header_read(st, s_header) < 0) {
	cl_log(LOG_ERR, "Unable to read header from device %d", st->devfd);
	free(s_header);
	return NULL;
	}

	if (valid_header(s_header) < 0) {
	cl_log(LOG_ERR, "header on device %d is not valid.", st->devfd);
	free(s_header);
	return NULL;
	}

	/* cl_log(LOG_INFO, "Found version %d header with %d slots",
	s_header->version, s_header->slots); */

	return s_header;
	}

	static int
	header_dump(struct sbd_context *st)
	{
	struct sector_header_s *s_header;
	char uuid[37];

	s_header = header_get(st);
	if (s_header == NULL)
	return -1;

	printf("Header version : %u.%u\n", s_header->version,
	s_header->minor_version);
	if (s_header->minor_version > 0) {
	uuid_unparse_lower(s_header->uuid, uuid);
	printf("UUID : %s\n", uuid);
	}

	printf("Number of slots : %u\n", s_header->slots);
	printf("Sector size : %lu\n",
	(unsigned long)s_header->sector_size);
	printf("Timeout (watchdog) : %lu\n",
	(unsigned long)s_header->timeout_watchdog);
	printf("Timeout (allocate) : %lu\n",
	(unsigned long)s_header->timeout_allocate);
	printf("Timeout (loop) : %lu\n",
	(unsigned long)s_header->timeout_loop);
	printf("Timeout (msgwait) : %lu\n",
	(unsigned long)s_header->timeout_msgwait);

	free(s_header);
	return 0;
	}

	static int
	init_device(struct sbd_context *st)
	{
	struct sector_header_s *s_header;
	struct sector_node_s *s_node;
	struct sector_mbox_s *s_mbox;
	char uuid[37];
	int i;
	int rc = 0;

	s_header = sector_alloc();
	s_node = sector_alloc();
	s_mbox = sector_alloc();
	memcpy(s_header->magic, sbd_magic, sizeof(s_header->magic));
	s_header->version = sbd_version;
	s_header->slots = 255;
	s_header->sector_size = sector_size;
	s_header->timeout_watchdog = timeout_watchdog;
	s_header->timeout_allocate = timeout_allocate;
	s_header->timeout_loop = timeout_loop;
	s_header->timeout_msgwait = timeout_msgwait;

	s_header->minor_version = 1;
	uuid_generate(s_header->uuid);
	uuid_unparse_lower(s_header->uuid, uuid);

	cl_log(LOG_INFO, "Creating version %d.%d header on device %d (uuid: %s)",
	s_header->version, s_header->minor_version,
	st->devfd, uuid);
	fprintf(stdout, "Creating version %d.%d header on device %d (uuid: %s)\n",
	s_header->version, s_header->minor_version,
	st->devfd, uuid);
	if (header_write(st, s_header) < 0) {
	rc = -1; goto out;
	}
	cl_log(LOG_INFO, "Initializing %d slots on device %d",
	s_header->slots,
	st->devfd);
	fprintf(stdout, "Initializing %d slots on device %d\n",
	s_header->slots,
	st->devfd);
	for (i=0;i < s_header->slots;i++) {
	if (slot_write(st, i, s_node) < 0) {
	rc = -1; goto out;
	}
	if (mbox_write(st, i, s_mbox) < 0) {
	rc = -1; goto out;
	}
	}

	out: free(s_mbox);
	free(s_node);
	free(s_header);
	return(rc);
	}

	/* Check if there already is a slot allocated to said name; returns the
	* slot number. If not found, returns -1.
	* This is necessary because slots might not be continuous. */
	static int
	slot_lookup(struct sbd_context st, const struct sector_header_s s_header, const char *name)
	{
	struct sector_node_s *s_node = NULL;
	int i;
	int rc = -1;

	if (!name) {
	cl_log(LOG_ERR, "slot_lookup(): No name specified.\n");
	goto out;
	}

	s_node = sector_alloc();

	for (i=0; i < s_header->slots; i++) {
	if (slot_read(st, i, s_node) < 0) {
	rc = -2; goto out;
	}
	if (s_node->in_use != 0) {
	if (strncasecmp(s_node->name, name,
	SECTOR_NAME_MAX) == 0) {
	DBGLOG(LOG_INFO, "%s owns slot %d", name, i);
	rc = i; goto out;
	}
	}
	}

	out: free(s_node);
	return rc;
	}

	static int
	slot_unused(struct sbd_context st, const struct sector_header_s s_header)
	{
	struct sector_node_s *s_node;
	int i;
	int rc = -1;

	s_node = sector_alloc();

	for (i=0; i < s_header->slots; i++) {
	if (slot_read(st, i, s_node) < 0) {
	rc = -1; goto out;
	}
	if (s_node->in_use == 0) {
	rc = i; goto out;
	}
	}

	out: free(s_node);
	return rc;
	}


	static int
	slot_allocate(struct sbd_context st, const char name)
	{
	struct sector_header_s *s_header = NULL;
	struct sector_node_s *s_node = NULL;
	struct sector_mbox_s *s_mbox = NULL;
	int i;
	int rc = 0;

	if (!name) {
	cl_log(LOG_ERR, "slot_allocate(): No name specified.\n");
	fprintf(stderr, "slot_allocate(): No name specified.\n");
	rc = -1; goto out;
	}

	s_header = header_get(st);
	if (!s_header) {
	rc = -1; goto out;
	}

	s_node = sector_alloc();
	s_mbox = sector_alloc();

	while (1) {
	i = slot_lookup(st, s_header, name);
	if ((i >= 0) \|\| (i == -2)) {
	/* -1 is "no slot found", in which case we
	* proceed to allocate a new one.
	* -2 is "read error during lookup", in which
	* case we error out too
	* >= 0 is "slot already allocated" */
	rc = i; goto out;
	}

	i = slot_unused(st, s_header);
	if (i >= 0) {
	cl_log(LOG_INFO, "slot %d is unused - trying to own", i);
	fprintf(stdout, "slot %d is unused - trying to own\n", i);
	memset(s_node, 0, sizeof(*s_node));
	s_node->in_use = 1;
	strncpy(s_node->name, name, SECTOR_NAME_MAX);
	if (slot_write(st, i, s_node) < 0) {
	rc = -1; goto out;
	}
	sleep(timeout_allocate);
	} else {
	cl_log(LOG_ERR, "No more free slots.");
	fprintf(stderr, "No more free slots.\n");
	rc = -1; goto out;
	}
	}

	out: free(s_mbox);
	free(s_node);
	free(s_header);
	return(rc);
	}

	static int
	slot_list(struct sbd_context *st)
	{
	struct sector_header_s *s_header = NULL;
	struct sector_node_s *s_node = NULL;
	struct sector_mbox_s *s_mbox = NULL;
	int i;
	int rc = 0;

	s_header = header_get(st);
	if (!s_header) {
	rc = -1; goto out;
	}

	s_node = sector_alloc();
	s_mbox = sector_alloc();

	for (i=0; i < s_header->slots; i++) {
	if (slot_read(st, i, s_node) < 0) {
	rc = -1; goto out;
	}
	if (s_node->in_use > 0) {
	if (mbox_read(st, i, s_mbox) < 0) {
	rc = -1; goto out;
	}
	printf("%d\t%s\t%s\t%s\n",
	i, s_node->name, char2cmd(s_mbox->cmd),
	s_mbox->from);
	}
	}

	out: free(s_mbox);
	free(s_node);
	free(s_header);
	return rc;
	}

	static int
	slot_msg(struct sbd_context st, const char name, const char *cmd)
	{
	struct sector_header_s *s_header = NULL;
	struct sector_mbox_s *s_mbox = NULL;
	int mbox;
	int rc = 0;
	char uuid[37];

	if (!name \|\| !cmd) {
	cl_log(LOG_ERR, "slot_msg(): No recipient / cmd specified.\n");
	rc = -1; goto out;
	}

	s_header = header_get(st);
	if (!s_header) {
	rc = -1; goto out;
	}

	if (strcmp(name, "LOCAL") == 0) {
	name = local_uname;
	}

	if (s_header->minor_version > 0) {
	uuid_unparse_lower(s_header->uuid, uuid);
	cl_log(LOG_INFO, "Device UUID: %s", uuid);
	}

	mbox = slot_lookup(st, s_header, name);
	if (mbox < 0) {
	cl_log(LOG_ERR, "slot_msg(): No slot found for %s.", name);
	rc = -1; goto out;
	}

	s_mbox = sector_alloc();

	s_mbox->cmd = cmd2char(cmd);
	if (s_mbox->cmd < 0) {
	cl_log(LOG_ERR, "slot_msg(): Invalid command %s.", cmd);
	rc = -1; goto out;
	}

	strncpy(s_mbox->from, local_uname, SECTOR_NAME_MAX);

	cl_log(LOG_INFO, "Writing %s to node slot %s",
	cmd, name);
	if (mbox_write_verify(st, mbox, s_mbox) < -1) {
	rc = -1; goto out;
	}
	if (strcasecmp(cmd, "exit") != 0) {
	cl_log(LOG_INFO, "Messaging delay: %d",
	(int)timeout_msgwait);
	sleep(timeout_msgwait);
	}
	cl_log(LOG_INFO, "%s successfully delivered to %s",
	cmd, name);

	out: free(s_mbox);
	free(s_header);
	return rc;
	}

	static int
	slot_ping(struct sbd_context st, const char name)
	{
	struct sector_header_s *s_header = NULL;
	struct sector_mbox_s *s_mbox = NULL;
	int mbox;
	int waited = 0;
	int rc = 0;

	if (!name) {
	cl_log(LOG_ERR, "slot_ping(): No recipient specified.\n");
	rc = -1; goto out;
	}

	s_header = header_get(st);
	if (!s_header) {
	rc = -1; goto out;
	}

	if (strcmp(name, "LOCAL") == 0) {
	name = local_uname;
	}

	mbox = slot_lookup(st, s_header, name);
	if (mbox < 0) {
	cl_log(LOG_ERR, "slot_msg(): No slot found for %s.", name);
	rc = -1; goto out;
	}

	s_mbox = sector_alloc();
	s_mbox->cmd = SBD_MSG_TEST;

	strncpy(s_mbox->from, local_uname, SECTOR_NAME_MAX);

	DBGLOG(LOG_DEBUG, "Pinging node %s", name);
	if (mbox_write(st, mbox, s_mbox) < -1) {
	rc = -1; goto out;
	}

	rc = -1;
	while (waited <= timeout_msgwait) {
	if (mbox_read(st, mbox, s_mbox) < 0)
	break;
	if (s_mbox->cmd != SBD_MSG_TEST) {
	rc = 0;
	break;
	}
	sleep(1);
	waited++;
	}

	if (rc == 0) {
	cl_log(LOG_DEBUG, "%s successfully pinged.", name);
	} else {
	cl_log(LOG_ERR, "%s failed to ping.", name);
	}

	out: free(s_mbox);
	free(s_header);
	return rc;
	}

	int init_devices(struct servants_list_item *servants)
	{
	int rc = 0;
	struct sbd_context *st;
	struct servants_list_item *s;

	for (s = servants; s; s = s->next) {
	fprintf(stdout, "Initializing device %s\n",
	s->devname);
	st = open_device(s->devname, LOG_ERR);
	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);
	}
	fprintf(stdout, "Did you check sbd service down on all nodes before? If not do so now and restart afterwards.\n");
	return 0;
	}

	static int slot_msg_wrapper(const char* devname, int mode, 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, LOG_WARNING);
	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;
	}

	static int slot_ping_wrapper(const char* devname, int mode, const void* argp)
	{
	int rc = 0;
	const char* name = (const char*)argp;
	struct sbd_context *st;

	st = open_device(devname, LOG_WARNING);
	if (!st)
	return -1;
	rc = slot_ping(st, name);
	close_device(st);
	return rc;
	}

	int allocate_slots(const char name, struct servants_list_item servants)
	{
	int rc = 0;
	struct sbd_context *st;
	struct servants_list_item *s;

	for (s = servants; s; s = s->next) {
	fprintf(stdout, "Trying to allocate slot for %s on device %s.\n",
	name,
	s->devname);
	st = open_device(s->devname, LOG_WARNING);
	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(struct servants_list_item *servants)
	{
	int rc = 0;
	struct servants_list_item *s;
	struct sbd_context *st;

	for (s = servants; s; s = s->next) {
	int rv = 0;

	st = open_device(s->devname, LOG_WARNING);
	if (!st) {
	rc = -1;
	fprintf(stderr, "== disk %s unreadable!\n", s->devname);
	continue;
	}
	rv = slot_list(st);
	close_device(st);
	if (rv == -1) {
	rc = -1;
	fprintf(stderr, "== Slots on disk %s NOT dumped\n", s->devname);
	}
	}
	return rc;
	}

	int ping_via_slots(const char name, struct servants_list_item servants)
	{
	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; s; s = s->next) {
	if(sbd_is_disk(s)) {
	s->pid = assign_servant(s->devname, &slot_ping_wrapper, 0, (const void*)name);
	}
	}

	while (servants_finished < disk_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 (sbd_is_disk(s)) {
	servants_finished++;
	}
	}
	}
	}
	}
	return 0;
	}

	int quorum_write(int good_servants)
	{
	return (good_servants > disk_count/2);
	}

	int messenger(const char name, const char msg, struct servants_list_item *servants)
	{
	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; s; s = s->next) {
	s->pid = assign_servant(s->devname, &slot_msg_wrapper, 0, &slot_msg_arg);
	}

	while (!(quorum_write(successful_delivery) \|\|
	(servants_finished == disk_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;
	}
	}

	unsigned long
	get_first_msgwait(struct servants_list_item *servants)
	{
	unsigned long msgwait = 0;
	struct servants_list_item *s = servants;

	for (s = servants; s; s = s->next) {
	struct sbd_context *st;
	struct sector_header_s *s_header;
	st = open_device(s->devname, LOG_WARNING);
	if (!st) {
	continue;
	}

	s_header = header_get(st);
	if (s_header != NULL) {
	msgwait = (unsigned long)s_header->timeout_msgwait;
	close_device(st);
	free(s_header);
	return msgwait;
	}

	close_device(st);
	}
	return msgwait;
	}

	int dump_headers(struct servants_list_item *servants)
	{
	int rc = 0;
	struct servants_list_item *s = servants;
	struct sbd_context *st;

	for (s = servants; s; s = s->next) {
	int rv;

	fprintf(stdout, "==Dumping header on disk %s\n", s->devname);
	st = open_device(s->devname, LOG_WARNING);
	if (st) {
	rv = header_dump(st);
	close_device(st);
	} else {
	fprintf(stderr, "== disk %s unreadable!\n", s->devname);
	rv = -1;
	}

	if (rv == -1) {
	rc = -1;
	fprintf(stderr, "==Header on disk %s NOT dumped\n", s->devname);
	} else {
	fprintf(stdout, "==Header on disk %s is dumped\n", s->devname);
	}
	}
	return rc;
	}

	void open_any_device(struct servants_list_item *servants)
	{
	struct sector_header_s *hdr_cur = NULL;
	struct timespec t_0;
	int t_wait = 0;
	bool logged_once = false;

	clock_gettime(CLOCK_MONOTONIC, &t_0);

	while (!hdr_cur && t_wait < timeout_startup) {
	struct timespec t_now;
	struct servants_list_item* s;

	for (s = servants; s; s = s->next) {
	struct sbd_context *st = open_device(s->devname, LOG_DEBUG);
	if (!st) {
	if (logged_once == false) {
	cl_log(LOG_WARNING, "Failed to open %s. "
	"Trying any other configured devices, "
	"otherwise retrying every %ds within %ds",
	s->devname, timeout_loop, timeout_startup);
	logged_once = true;
	}
	continue;
	}
	hdr_cur = header_get(st);
	close_device(st);
	if (hdr_cur) {
	break;
	} else {
	if (logged_once == false) {
	cl_log(LOG_WARNING, "Failed to read header from %s. "
	"Trying any other configured devices, "
	"otherwise retrying every %ds within %ds",
	s->devname, timeout_loop, timeout_startup);
	logged_once = true;
	}
	}
	}
	clock_gettime(CLOCK_MONOTONIC, &t_now);
	t_wait = t_now.tv_sec - t_0.tv_sec;
	if (!hdr_cur) {
	sleep(timeout_loop);
	}
	}

	if (hdr_cur) {
	timeout_watchdog = hdr_cur->timeout_watchdog;
	timeout_allocate = hdr_cur->timeout_allocate;
	timeout_loop = hdr_cur->timeout_loop;
	timeout_msgwait = hdr_cur->timeout_msgwait;
	} else {
	cl_log(LOG_ERR, "No devices were available at start-up within %i seconds.",
	timeout_startup);
	exit(1);
	}

	free(hdr_cur);
	return;
	}

	/*
	::-::-::-::-::-::-::-::-::-::-::-::-::
	Begin disk based servant code
	::-::-::-::-::-::-::-::-::-::-::-::-::
	*/

	static int servant_check_timeout_inconsistent(struct sector_header_s *hdr)
	{
	if (timeout_watchdog != hdr->timeout_watchdog) {
	cl_log(LOG_WARNING, "watchdog timeout: %d versus %d on this device",
	(int)timeout_watchdog, (int)hdr->timeout_watchdog);
	return -1;
	}
	if (timeout_allocate != hdr->timeout_allocate) {
	cl_log(LOG_WARNING, "allocate timeout: %d versus %d on this device",
	(int)timeout_allocate, (int)hdr->timeout_allocate);
	return -1;
	}
	if (timeout_loop != hdr->timeout_loop) {
	cl_log(LOG_WARNING, "loop timeout: %d versus %d on this device",
	(int)timeout_loop, (int)hdr->timeout_loop);
	return -1;
	}
	if (timeout_msgwait != hdr->timeout_msgwait) {
	cl_log(LOG_WARNING, "msgwait timeout: %d versus %d on this device",
	(int)timeout_msgwait, (int)hdr->timeout_msgwait);
	return -1;
	}
	return 0;
	}

	int servant_md(const char diskname, int mode, 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;

	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);

	st = open_device(diskname, LOG_WARNING);
	if (!st) {
	exit(EXIT_MD_SERVANT_IO_FAIL);
	}

	s_header = header_get(st);
	if (!s_header) {
	cl_log(LOG_ERR, "Not a valid header on %s", diskname);
	rc = EXIT_MD_SERVANT_IO_FAIL;
	goto out;
	}

	if (servant_check_timeout_inconsistent(s_header) < 0) {
	cl_log(LOG_ERR, "Timeouts on %s do not match first device",
	diskname);
	rc = EXIT_MD_SERVANT_IO_FAIL;
	goto out;
	}

	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 = EXIT_MD_SERVANT_IO_FAIL;
	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);
	rc = EXIT_MD_SERVANT_IO_FAIL;
	goto out;
	}

	cl_log(LOG_NOTICE, "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 (mode > 0) {
	if (mbox_read(st, mbox, s_mbox) < 0) {
	cl_log(LOG_ERR, "mbox read failed during start-up in servant.");
	rc = EXIT_MD_SERVANT_IO_FAIL;
	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);
	+ sigqueue_zero(ppid, SIG_EXITREQ);
	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 = EXIT_MD_SERVANT_IO_FAIL;
	goto out;
	}
	}

	- memset(&signal_value, 0, sizeof(signal_value));
	-
	while (1) {
	struct sector_header_s *s_header_retry = NULL;
	struct sector_node_s *s_node_retry = NULL;

	t0 = time(NULL);
	sleep(timeout_loop);

	ppid = getppid();

	if (ppid == 1) {
	/* Our parent died unexpectedly. Triggering
	* self-fence. */
	do_timeout_action();
	}

	/* 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);
	rc = EXIT_MD_SERVANT_IO_FAIL;
	goto out;
	}
	if (memcmp(s_header, s_header_retry, sizeof(*s_header)) != 0) {
	cl_log(LOG_ERR, "Header on %s changed since start-up!", diskname);
	free(s_header_retry);
	rc = EXIT_MD_SERVANT_IO_FAIL;
	goto out;
	}
	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.");
	free(s_node_retry);
	rc = EXIT_MD_SERVANT_IO_FAIL;
	goto out;
	}
	if (memcmp(s_node, s_node_retry, sizeof(*s_node)) != 0) {
	cl_log(LOG_ERR, "Node entry on %s changed since start-up!", diskname);
	free(s_node_retry);
	rc = EXIT_MD_SERVANT_IO_FAIL;
	goto out;
	}
	free(s_node_retry);

	if (mbox_read(st, mbox, s_mbox) < 0) {
	cl_log(LOG_ERR, "mbox read failed in servant.");
	rc = EXIT_MD_SERVANT_IO_FAIL;
	goto out;
	}

	if (s_mbox->cmd > 0) {
	cl_log(LOG_NOTICE,
	"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);
	+ sigqueue_zero(ppid, SIG_TEST);
	break;
	case SBD_MSG_RESET:
	rc = EXIT_MD_SERVANT_REQUEST_RESET;
	goto out;
	case SBD_MSG_OFF:
	rc = EXIT_MD_SERVANT_REQUEST_SHUTOFF;
	goto out;
	case SBD_MSG_EXIT:
	- sigqueue(ppid, SIG_EXITREQ, signal_value);
	+ sigqueue_zero(ppid, SIG_EXITREQ);
	break;
	case SBD_MSG_CRASHDUMP:
	rc = EXIT_MD_SERVANT_REQUEST_CRASHDUMP;
	goto out;
	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);
	+ sigqueue_zero(ppid, SIG_LIVENESS);

	t1 = time(NULL);
	latency = t1 - t0;
	if (timeout_watchdog_warn && (latency > timeout_watchdog_warn)) {
	cl_log(LOG_WARNING,
	"Latency: %ds exceeded watchdog warning timeout %ds on disk %s",
	(int)latency, (int)timeout_watchdog_warn,
	diskname);
	} else if (debug) {
	DBGLOG(LOG_DEBUG, "Latency: %ds on disk %s", (int)latency,
	diskname);
	}
	}
	out:
	free(s_node);
	free(s_mbox);
	free(s_header);
	close_device(st);
	exit(rc);
	}

	diff --git a/src/sbd.h b/src/sbd.h
	index bbdc6f1..7874e8d 100644
	--- a/src/sbd.h
	+++ b/src/sbd.h
	@@ -1,219 +1,220 @@
	/*
	* 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 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 program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#include <arpa/inet.h>
	#include <asm/unistd.h>
	#include <ctype.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <libaio.h>
	#include <linux/fs.h>
	#include <linux/types.h>
	#include <linux/watchdog.h>
	#include <malloc.h>
	#include <signal.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <stdbool.h>
	#include <string.h>
	#include <sys/ioctl.h>
	#include <sys/ptrace.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <sys/utsname.h>
	#include <sys/wait.h>
	#include <syslog.h>
	#include <time.h>
	#include <unistd.h>
	#include <uuid/uuid.h>
	#include <qb/qblog.h>
	#include <crm_config.h>
	#include <config.h>

	/* signals reserved for multi-disk sbd */
	#define SIG_LIVENESS (SIGRTMIN + 1) /* report liveness of the disk */
	#define SIG_EXITREQ (SIGRTMIN + 2) /* exit request to inquisitor */
	#define SIG_TEST (SIGRTMIN + 3) /* trigger self test */
	#define SIG_RESTART (SIGRTMIN + 4) /* trigger restart of all failed disk */
	#define SIG_PCMK_UNHEALTHY (SIGRTMIN + 5)
	/* FIXME: should add dynamic check of SIG_XX >= SIGRTMAX */

	/* exit status for disk-servant */
	#define EXIT_MD_SERVANT_IO_FAIL 20
	#define EXIT_MD_SERVANT_REQUEST_RESET 21
	#define EXIT_MD_SERVANT_REQUEST_SHUTOFF 22
	#define EXIT_MD_SERVANT_REQUEST_CRASHDUMP 23

	/* exit status for pcmk-servant */
	#define EXIT_PCMK_SERVANT_GRACEFUL_SHUTDOWN 30

	#define HOG_CHAR 0xff
	#define SECTOR_NAME_MAX 63

	/* Sector data types */
	struct sector_header_s {
	char magic[8];
	unsigned char version;
	unsigned char slots;
	/* Caveat: stored in network byte-order */
	uint32_t sector_size;
	uint32_t timeout_watchdog;
	uint32_t timeout_allocate;
	uint32_t timeout_loop;
	uint32_t timeout_msgwait;
	/* Minor version for extensions to the core data set:
	* compatible and optional values. */
	unsigned char minor_version;
	uuid_t uuid; /* 16 bytes */
	};

	struct sector_mbox_s {
	signed char cmd;
	char from[SECTOR_NAME_MAX+1];
	};

	struct sector_node_s {
	/* slots will be created with in_use == 0 */
	char in_use;
	char name[SECTOR_NAME_MAX+1];
	};

	struct servants_list_item {
	const char* devname;
	pid_t pid;
	int restarts;
	int restart_blocked;
	int outdated;
	int first_start;
	struct timespec t_last, t_started;
	struct servants_list_item *next;
	};

	struct sbd_context {
	int devfd;
	io_context_t ioctx;
	struct iocb io;
	void *buffer;
	};

	enum pcmk_health
	{
	pcmk_health_unknown,
	pcmk_health_pending,
	pcmk_health_transient,
	pcmk_health_unclean,
	pcmk_health_shutdown,
	pcmk_health_online,
	pcmk_health_noquorum,
	};

	void usage(void);
	int watchdog_init_interval(void);
	int watchdog_tickle(void);
	int watchdog_init(void);
	void sysrq_init(void);
	void watchdog_close(bool disarm);
	int watchdog_info(void);
	int watchdog_test(void);
	void sysrq_trigger(char t);
	void do_crashdump(void);
	void do_reset(void);
	void do_off(void);
	void do_timeout_action(void);
	pid_t make_daemon(void);
	void maximize_priority(void);
	void sbd_get_uname(void);
	void sbd_set_format_string(int method, const char *daemon);
	+int sigqueue_zero(pid_t pid, int sig);
	void notify_parent(void);

	/* Tunable defaults: */
	extern unsigned long timeout_watchdog;
	extern unsigned long timeout_watchdog_warn;
	extern bool do_calculate_timeout_watchdog_warn;
	extern unsigned long timeout_watchdog_crashdump;
	extern int timeout_allocate;
	extern int timeout_loop;
	extern int timeout_msgwait;
	extern int timeout_io;
	extern int timeout_startup;
	extern int watchdog_use;
	extern int watchdog_set_timeout;
	extern int skip_rt;
	extern int debug;
	extern int debug_mode;
	extern char *watchdogdev;
	extern bool watchdogdev_is_default;
	extern char* local_uname;
	extern bool do_flush;
	extern char timeout_sysrq_char;
	extern bool move_to_root_cgroup;
	extern bool enforce_moving_to_root_cgroup;
	extern bool sync_resource_startup;

	/* Global, non-tunable variables: */
	extern int sector_size;
	extern int watchdogfd;
	extern const char* cmdname;

	typedef int (functionp_t)(const char devname, int mode, const void* argp);

	int assign_servant(const char* devname, functionp_t functionp, int mode, const void* argp);

	#if SUPPORT_SHARED_DISK
	void open_any_device(struct servants_list_item *servants);
	int init_devices(struct servants_list_item *servants);
	int allocate_slots(const char name, struct servants_list_item servants);
	int list_slots(struct servants_list_item *servants);
	int ping_via_slots(const char name, struct servants_list_item servants);
	int dump_headers(struct servants_list_item *servants);
	unsigned long get_first_msgwait(struct servants_list_item *servants);
	int messenger(const char name, const char msg, struct servants_list_item *servants);
	int servant_md(const char diskname, int mode, const void argp);
	#endif

	int servant_pcmk(const char diskname, int mode, const void argp);
	int servant_cluster(const char diskname, int mode, const void argp);

	struct servants_list_item lookup_servant_by_dev(const char devname);
	struct servants_list_item *lookup_servant_by_pid(pid_t pid);

	int init_set_proc_title(int argc, char argv[], char envp[]);
	void set_proc_title(const char *fmt,...);

	#define cl_log(level, fmt, args...) qb_log_from_external_source( __func__, __FILE__, fmt, level, __LINE__, 0, ##args)

	# define cl_perror(fmt, args...) do { \
	const char *err = strerror(errno); \
	cl_log(LOG_ERR, fmt ": %s (%d)", ##args, err, errno); \
	} while(0)

	#define DBGLOG(lvl, fmt, args...) do { \
	if (debug > 0) cl_log(lvl, fmt, ##args); \
	} while(0)

	extern int servant_health;
	void set_servant_health(enum pcmk_health state, int level, char const *format, ...) __attribute__ ((__format__ (__printf__, 3, 4)));

	bool sbd_is_disk(struct servants_list_item *servant);
	bool sbd_is_pcmk(struct servants_list_item *servant);
	bool sbd_is_cluster(struct servants_list_item *servant);

	#define calculate_timeout_watchdog_warn(timeout) \
	(timeout < 5 ? 2 : \
	(timeout < (ULONG_MAX / 3) ? \
	(((unsigned long) timeout) * 3 / 5) : (((unsigned long) timeout) / 5 * 3)))

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