clvmd: add L option to enable lvm debugging

daemons/clvmd/clvmd.c

@@ -69,6 +69,8 @@ static unsigned max_csid_len;
 static unsigned max_cluster_message;
 static unsigned max_cluster_member_name_len;
 
+int clvmd_debug_lvm;
+
 static void _add_client(struct local_client *new_client, struct local_client *existing_client)
 {
 	_local_client_count++;
@@ -411,7 +413,7 @@ int main(int argc, char *argv[])
 	/* Deal with command-line arguments */
 	opterr = 0;
 	optind = 0;
-	while ((opt = getopt_long(argc, argv, "Vhfd:t:RST:CI:E:",
+	while ((opt = getopt_long(argc, argv, "Vhfd:t:RST:CLI:E:",
 				  longopts, NULL)) != -1) {
 		switch (opt) {
 		case 'h':
@@ -432,6 +434,10 @@ int main(int argc, char *argv[])
 			clusterwide_opt = 1;
 			break;
 
+		case 'L':
+			clvmd_debug_lvm = 1;
+			break;
+
 		case 'd':
 			debug_opt = DEBUG_STDERR;
 			debug_arg = (debug_t) atoi(optarg);

daemons/clvmd/lvm-functions.c

@@ -38,6 +38,8 @@ static pthread_mutex_t lv_hash_lock;
 static pthread_mutex_t lvm_lock;
 static char last_error[1024];
 
+extern int clvmd_debug_lvm;
+
 struct lv_info {
 	int lock_id;
 	int lock_mode;
@@ -656,6 +658,11 @@ int do_refresh_cache(void)
 	label_scan_destroy(cmd); /* destroys bcache (to close devs), keeps lvmcache */
 	dm_pool_empty(cmd->mem);
 
+	if (clvmd_debug_lvm) {
+		init_verbose(11);
+		init_debug(11);
+	}
+
 	pthread_mutex_unlock(&lvm_lock);
 
 	return 0;
@@ -909,6 +916,11 @@ int init_clvm(struct dm_hash_table *excl_uuid)
 	check_config();
 	init_ignore_suspended_devices(1);
 
+	if (clvmd_debug_lvm) {
+		init_verbose(11);
+		init_debug(11);
+	}
+
 	/* Trap log messages so we can pass them back to the user */
 	init_log_fn(lvm2_log_fn);
 	memlock_inc_daemon(cmd);