logging: Make blackbox configurable

Signed-off-by: Jan Friesse <jfriesse@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>

exec/logconfig.c

@@ -127,7 +127,7 @@ static int insert_into_buffer(
 }
 
 /*
- * format set is the only global specific option that
+ * format set is global specific option that
  * doesn't apply at system/subsystem level.
  */
 static int corosync_main_config_format_set (
@@ -228,6 +228,40 @@ static int corosync_main_config_format_set (
 	return (-1);
 }
 
+/*
+ * blackbox is another global specific option that
+ * doesn't apply at system/subsystem level.
+ */
+static int corosync_main_config_blackbox_set (
+	const char **error_string)
+{
+	const char *error_reason;
+	char *value = NULL;
+
+	if (map_get_string("logging.blackbox", &value) == CS_OK) {
+		if (strcmp (value, "on") == 0) {
+			(void)logsys_blackbox_set(QB_TRUE);
+		} else if (strcmp (value, "off") == 0) {
+			(void)logsys_blackbox_set(QB_FALSE);
+		} else {
+			error_reason = "unknown value for blackbox";
+			free(value);
+			goto parse_error;
+		}
+
+		free(value);
+	} else {
+		(void)logsys_blackbox_set(QB_TRUE);
+	}
+
+	return (0);
+
+parse_error:
+	*error_string = error_reason;
+
+	return (-1);
+}
+
 static int corosync_main_config_log_destination_set (
 	const char *path,
 	const char *key,
@@ -522,6 +556,10 @@ static int corosync_main_config_read_logging (
 		goto parse_error;
 	}
 
+	if (corosync_main_config_blackbox_set(&error_reason) < 0) {
+		goto parse_error;
+	}
+
 	if (corosync_main_config_set ("logging", NULL, &error_reason) < 0) {
 		goto parse_error;
 	}

exec/logsys.c

@@ -118,6 +118,8 @@ static char *format_buffer=NULL;
 
 static int logsys_thread_started = 0;
 
+static int logsys_blackbox_enabled = 1;
+
 static int _logsys_config_subsys_get_unlocked (const char *subsys)
 {
 	unsigned int i;
@@ -308,7 +310,6 @@ int _logsys_system_setup(
 	int i;
 	int32_t fidx;
 	char tempsubsys[LOGSYS_MAX_SUBSYS_NAMELEN];
-	int blackbox_enable_res;
 
 	if ((mainsystem == NULL) ||
 	    (strlen(mainsystem) >= LOGSYS_MAX_SUBSYS_NAMELEN)) {
@@ -370,7 +371,12 @@ int _logsys_system_setup(
 			  QB_LOG_FILTER_FILE, "*", LOG_TRACE);
 	qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_SIZE, IPC_LOGSYS_SIZE);
 	qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_THREADED, QB_FALSE);
-	blackbox_enable_res = qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_ENABLED, QB_TRUE);
+
+	/*
+	 * Blackbox is disabled at the init and enabled later based
+	 * on config (logging.blackbox) value.
+	 */
+	qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_ENABLED, QB_FALSE);
 
 	if (logsys_format_set(NULL) == -1) {
 		return -1;
@@ -396,14 +402,6 @@ int _logsys_system_setup(
 		}
 	}
 
-	if (blackbox_enable_res < 0) {
-		LOGSYS_PERROR (-blackbox_enable_res, LOGSYS_LEVEL_WARNING,
-		    "Unable to initialize log flight recorder. "\
-		    "The most common cause of this error is " \
-		    "not enough space on /dev/shm. Corosync will continue work, " \
-		    "but blackbox will not be available");
-	}
-
 	pthread_mutex_unlock (&logsys_config_mutex);
 
 	return (0);
@@ -766,10 +764,26 @@ static void _logsys_config_apply_per_subsys(int32_t s)
 	logsys_loggers[s].dirty = QB_FALSE;
 }
 
+static void _logsys_config_apply_blackbox(void) {
+	int blackbox_enable_res;
+
+	blackbox_enable_res = qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_ENABLED, logsys_blackbox_enabled);
+
+	if (blackbox_enable_res < 0) {
+		LOGSYS_PERROR (-blackbox_enable_res, LOGSYS_LEVEL_WARNING,
+		    "Unable to initialize log flight recorder. "\
+		    "The most common cause of this error is " \
+		    "not enough space on /dev/shm. Corosync will continue work, " \
+		    "but blackbox will not be available");
+	}
+}
+
 void logsys_config_apply(void)
 {
 	int32_t s;
 
+	_logsys_config_apply_blackbox();
+
 	for (s = 0; s <= LOGSYS_MAX_SUBSYS_COUNT; s++) {
 		if (strcmp(logsys_loggers[s].subsys, "") == 0) {
 			continue;
@@ -837,3 +851,13 @@ int logsys_thread_start (void)
 
 	return (0);
 }
+
+void logsys_blackbox_set(int enable)
+{
+
+	pthread_mutex_lock (&logsys_config_mutex);
+
+	logsys_blackbox_enabled = enable;
+
+	pthread_mutex_unlock (&logsys_config_mutex);
+}

exec/main.c

@@ -225,6 +225,7 @@ static void corosync_blackbox_write_to_file (void)
 
 	if ((res = qb_log_blackbox_write_to_file(fname)) < 0) {
 		LOGSYS_PERROR(-res, LOGSYS_LEVEL_ERROR, "Can't store blackbox file");
+		return ;
 	}
 	snprintf(fdata_fname, sizeof(fdata_fname), "%s/fdata", get_run_dir());
 	unlink(fdata_fname);

include/corosync/logsys.h

@@ -256,6 +256,8 @@ extern int _logsys_subsys_create (const char *subsys, const char *filename);
  */
 extern int logsys_thread_start (void);
 
+extern void logsys_blackbox_set(int enable);
+
 /**
  * @brief logsys_subsys_id
  */

man/corosync.conf.5

@@ -533,6 +533,12 @@ This specifies that the code function name should be printed.
 
 The default is off.
 
+.TP
+blackbox
+This specifies that blackbox functionality should be enabled.
+
+The defualt is on.
+
 .PP
 The following options are valid both for top level logging directive
 and they can be overridden in logger_subsys entries.