confile: extend call back system

src/lxc/confile.c

@@ -407,7 +407,7 @@ static int config_network_nic(const char *key, const char *value,
 		ERROR("unknown key %s", key);
 		goto out;
 	}
-	ret = config->cb(key, value, lxc_conf);
+	ret = config->set(key, value, lxc_conf);
 
 out:
 	free(copy);
@@ -2418,7 +2418,7 @@ static int parse_line(char *buffer, void *data)
 		goto out;
 	}
 
-	ret = config->cb(key, value, plc->conf);
+	ret = config->set(key, value, plc->conf);
 
 out:
 	free(linep);

src/lxc/confile.h

@@ -34,7 +34,9 @@ struct lxc_list;
 typedef int (*config_cb)(const char *, const char *, struct lxc_conf *);
 struct lxc_config_t {
 	char *name;
-	config_cb cb;
+	config_cb set;
+	config_cb get;
+	config_cb clear;
 };
 
 extern struct lxc_config_t *lxc_getconfig(const char *key);

src/lxc/lxccontainer.c

@@ -2461,7 +2461,7 @@ static bool set_config_item_locked(struct lxc_container *c, const char *key, con
 	config = lxc_getconfig(key);
 	if (!config)
 		return false;
-	if (config->cb(key, v, c->lxc_conf) != 0)
+	if (config->set(key, v, c->lxc_conf) != 0)
 		return false;
 	return do_append_unexp_config_line(c->lxc_conf, key, v);
 }