[Cluster-devel] [PATCH 09/10] dlm_controld: add new API set_opt_online()

[Heming Zhao <heming.zhao@suse.com>]

This API has ability to change dlm_controld settings on the fly.

Signed-off-by: Heming Zhao <heming.zhao@suse.com>
---
 dlm_controld/config.c     | 128 ++++++++++++++++++++++++++++++++++++++
 dlm_controld/dlm_daemon.h |   1 +
 2 files changed, 129 insertions(+)

diff --git a/dlm_controld/config.c b/dlm_controld/config.c
index d77f3826bfe6..9e799c8c04d2 100644
--- a/dlm_controld/config.c
+++ b/dlm_controld/config.c
@@ -292,3 +292,129 @@ void set_opt_file(int update)
 	fclose(file);
 }
 
+static void reset_opt_value(struct dlm_option *o)
+{
+	/* config priority: cli, config file, default */
+
+	if (o->cli_set) {
+		o->use_int = o->cli_int;
+		o->use_uint = o->cli_uint;
+		o->use_str = o->cli_str;
+		return;
+	}
+
+	if (o->file_set) {
+		o->use_int = o->file_int;
+		o->use_uint = o->file_uint;
+		o->use_str = o->file_str;
+		return;
+	}
+
+	o->use_int = o->default_int;
+	o->use_uint = o->default_uint;
+	o->use_str = (char *)o->default_str;
+
+	return;
+}
+
+/*
+ * do the clean/restore job:
+ * - clean up dlm_options[].dynamic_xx
+ * - using high priority config to set use_xx items.
+ */
+static void reset_dynamic(struct dlm_option *o)
+{
+	o->dynamic_set = 0;
+	o->dynamic_int = 0;
+	if (o->dynamic_str){
+		free(o->dynamic_str);
+		o->dynamic_str = NULL;
+	}
+	o->dynamic_uint = 0;
+	reset_opt_value(o);
+
+	set_configfs_opt("log_debug", NULL, opt(log_debug_ind));
+	set_logfile_priority();
+
+	return;
+}
+
+void set_opt_online(int argc, char **argv)
+{
+	int i = -1, val = 0, ind;
+	unsigned int uval = 0;
+	struct dlm_option *o;
+	char str[MAX_LINE];
+
+	if (!strcmp(argv[0], "restore_all")) {
+		for (i = 0; i < dlm_options_max; i++)
+			reset_dynamic(&dlm_options[i]);
+
+		return;
+	}
+
+	while (++i < argc) {
+		ind = get_ind_name(argv[i]);
+		if (ind < 0)
+			continue;
+		o = &dlm_options[ind];
+		if (!o || !o->dynamic)
+			continue;
+
+		get_val_str(argv[i], str);
+		if (!strcmp(str, "restore")) {
+			reset_dynamic(o);
+			continue;
+		}
+
+		o->dynamic_set++;
+
+		if (!o->req_arg || o->req_arg == req_arg_int) {
+			get_val_int(argv[i], &val);
+			if (!o->req_arg)
+				val = val ? 1 : 0;
+
+			o->dynamic_int = val;
+
+			log_debug("config dynamic %s = %d previous use %d",
+				  o->name, o->dynamic_int, o->use_int);
+			o->use_int = o->dynamic_int;
+
+		} else if (o->req_arg == req_arg_uint) {
+			get_val_uint(argv[i], &uval);
+			o->dynamic_uint = uval;
+
+			log_debug("config dynamic %s = %u previous use %u",
+				  o->name, o->dynamic_uint, o->use_uint);
+			o->use_uint = o->dynamic_uint;
+
+		} else if (o->req_arg == req_arg_bool) {
+			get_val_int(argv[i], &val);
+			o->dynamic_int = val ? 1 : 0;
+
+			log_debug("config dynamic %s = %d previous use %d",
+				  o->name, o->dynamic_int, o->use_int);
+			o->use_int = o->dynamic_int;
+
+		} else if (o->req_arg == req_arg_str) {
+			memset(str, 0, sizeof(str));
+			get_val_str(argv[i], str);
+
+			o->dynamic_str = strdup(str);
+
+			log_debug("config dynamic %s = %s previous use %s",
+				  o->name, o->dynamic_str, o->use_str);
+			o->use_str = o->dynamic_str;
+		}
+
+		if (ind == log_debug_ind) {
+			set_configfs_opt("log_debug", NULL, opt(log_debug_ind));
+		} else if (ind == debug_logfile_ind) {
+			set_logfile_priority();
+		}
+
+	}
+
+	return;
+}
+
diff --git a/dlm_controld/dlm_daemon.h b/dlm_controld/dlm_daemon.h
index 904bb0b50df9..8cc9f666872e 100644
--- a/dlm_controld/dlm_daemon.h
+++ b/dlm_controld/dlm_daemon.h
@@ -398,6 +398,7 @@ int set_configfs_opt(const char *name, char *str, int num);
 void set_opt_file(int update);
 int get_weight(struct lockspace *ls, int nodeid);
 void setup_lockspace_config(struct lockspace *ls);
+void set_opt_online(int argc, char **argv);
 
 /* cpg.c */
 void process_lockspace_changes(void);
-- 
2.32.0