invalidate rules and kmod index with 'udevadm control --reload'

  - rename --reload-rules to --reload
  - invalidate rules and databases only, delay parsing to the next event
  - enable debug output for test-builtin

8 files changed, 50 insertions, 43 deletions

diff --git a/udev/udev-builtin-kmod.c b/udev/udev-builtin-kmod.c
index 8e7a50a0..6f3e2589 100644
--- a/udev/udev-builtin-kmod.c
+++ b/udev/udev-builtin-kmod.c
@@ -321,11 +321,17 @@ static int builtin_kmod(struct udev_device *dev, int argc, char *argv[], bool te
 	struct udev *udev = udev_device_get_udev(dev);
 	int i;
 
-	if (!ctx)
-		return EXIT_FAILURE;
+	if (!ctx) {
+		ctx = kmod_new(NULL, NULL);
+		if (!ctx)
+			return -ENOMEM;
 
-	if (argc < 3) {
-		err(udev, "missing command + argument\n");
+		info(udev, "load module index\n");
+		kmod_load_resources(ctx);
+	}
+
+	if (argc < 3 || strcmp(argv[1], "load")) {
+		err(udev, "expect: %s load <module>\n", argv[0]);
 		return EXIT_FAILURE;
 	}
 
@@ -339,12 +345,15 @@ static int builtin_kmod(struct udev_device *dev, int argc, char *argv[], bool te
 
 static int builtin_kmod_init(struct udev *udev)
 {
-	kmod_unref(ctx);
+	if (ctx)
+		return 0;
+
 	ctx = kmod_new(NULL, NULL);
 	if (!ctx)
 		return -ENOMEM;
 
 	info(udev, "load module index\n");
+	kmod_load_resources(ctx);
 	return 0;
 }
 
diff --git a/udev/udev-ctrl.c b/udev/udev-ctrl.c
index e4348c31..fab1108d 100644
--- a/udev/udev-ctrl.c
+++ b/udev/udev-ctrl.c
@@ -30,7 +30,7 @@ enum udev_ctrl_msg_type {
 	UDEV_CTRL_SET_LOG_LEVEL,
 	UDEV_CTRL_STOP_EXEC_QUEUE,
 	UDEV_CTRL_START_EXEC_QUEUE,
-	UDEV_CTRL_RELOAD_RULES,
+	UDEV_CTRL_RELOAD,
 	UDEV_CTRL_SET_ENV,
 	UDEV_CTRL_SET_CHILDREN_MAX,
 	UDEV_CTRL_PING,
@@ -310,9 +310,9 @@ int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout)
 	return ctrl_send(uctrl, UDEV_CTRL_START_EXEC_QUEUE, 0, NULL, timeout);
 }
 
-int udev_ctrl_send_reload_rules(struct udev_ctrl *uctrl, int timeout)
+int udev_ctrl_send_reload(struct udev_ctrl *uctrl, int timeout)
 {
-	return ctrl_send(uctrl, UDEV_CTRL_RELOAD_RULES, 0, NULL, timeout);
+	return ctrl_send(uctrl, UDEV_CTRL_RELOAD, 0, NULL, timeout);
 }
 
 int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout)
@@ -458,9 +458,9 @@ int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg)
 	return -1;
 }
 
-int udev_ctrl_get_reload_rules(struct udev_ctrl_msg *ctrl_msg)
+int udev_ctrl_get_reload(struct udev_ctrl_msg *ctrl_msg)
 {
-	if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD_RULES)
+	if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_RELOAD)
 		return 1;
 	return -1;
 }
diff --git a/udev/udev-rules.c b/udev/udev-rules.c
index 4226d0b4..aa750219 100644
--- a/udev/udev-rules.c
+++ b/udev/udev-rules.c
@@ -1890,16 +1890,17 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
 	return rules;
 }
 
-void udev_rules_unref(struct udev_rules *rules)
+struct udev_rules *udev_rules_unref(struct udev_rules *rules)
 {
 	if (rules == NULL)
-		return;
+		return NULL;
 	free(rules->tokens);
 	free(rules->buf);
 	free(rules->trie_nodes);
 	free(rules->uids);
 	free(rules->gids);
 	free(rules);
+	return NULL;
 }
 
 static int match_key(struct udev_rules *rules, struct token *token, const char *val)
diff --git a/udev/udev.h b/udev/udev.h
index 430958a4..7bd2228a 100644
--- a/udev/udev.h
+++ b/udev/udev.h
@@ -66,7 +66,7 @@ struct udev_watch {
 /* udev-rules.c */
 struct udev_rules;
 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names);
-void udev_rules_unref(struct udev_rules *rules);
+struct udev_rules *udev_rules_unref(struct udev_rules *rules);
 int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask);
 void udev_rules_apply_static_dev_perms(struct udev_rules *rules);
 
@@ -109,7 +109,7 @@ int udev_ctrl_get_fd(struct udev_ctrl *uctrl);
 int udev_ctrl_send_set_log_level(struct udev_ctrl *uctrl, int priority, int timeout);
 int udev_ctrl_send_stop_exec_queue(struct udev_ctrl *uctrl, int timeout);
 int udev_ctrl_send_start_exec_queue(struct udev_ctrl *uctrl, int timeout);
-int udev_ctrl_send_reload_rules(struct udev_ctrl *uctrl, int timeout);
+int udev_ctrl_send_reload(struct udev_ctrl *uctrl, int timeout);
 int udev_ctrl_send_ping(struct udev_ctrl *uctrl, int timeout);
 int udev_ctrl_send_exit(struct udev_ctrl *uctrl, int timeout);
 int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout);
@@ -125,7 +125,7 @@ struct udev_ctrl_msg *udev_ctrl_msg_unref(struct udev_ctrl_msg *ctrl_msg);
 int udev_ctrl_get_set_log_level(struct udev_ctrl_msg *ctrl_msg);
 int udev_ctrl_get_stop_exec_queue(struct udev_ctrl_msg *ctrl_msg);
 int udev_ctrl_get_start_exec_queue(struct udev_ctrl_msg *ctrl_msg);
-int udev_ctrl_get_reload_rules(struct udev_ctrl_msg *ctrl_msg);
+int udev_ctrl_get_reload(struct udev_ctrl_msg *ctrl_msg);
 int udev_ctrl_get_ping(struct udev_ctrl_msg *ctrl_msg);
 int udev_ctrl_get_exit(struct udev_ctrl_msg *ctrl_msg);
 const char *udev_ctrl_get_set_env(struct udev_ctrl_msg *ctrl_msg);
diff --git a/udev/udevadm-control.c b/udev/udevadm-control.c
index 130a71b3..dd1d5d78 100644
--- a/udev/udevadm-control.c
+++ b/udev/udevadm-control.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2005-2008 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2005-2011 Kay Sievers <kay.sievers@vrfy.org>
  *
  * 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
@@ -32,9 +32,9 @@ static void print_help(void)
 	printf("Usage: udevadm control COMMAND\n"
 		"  --exit                   instruct the daemon to cleanup and exit\n"
 		"  --log-priority=<level>   set the udev log level for the daemon\n"
-		"  --stop-exec-queue        keep udevd from executing events, queue only\n"
+		"  --stop-exec-queue        do not execute events, queue only\n"
 		"  --start-exec-queue       execute events, flush queue\n"
-		"  --reload-rules           reloads the rules files\n"
+		"  --reload                 reload rules and databases\n"
 		"  --property=<KEY>=<value> set a global property for all events\n"
 		"  --children-max=<N>       maximum number of children\n"
 		"  --timeout=<seconds>      maximum time to block for a reply\n"
@@ -52,6 +52,7 @@ static int adm_control(struct udev *udev, int argc, char *argv[])
 		{ "log-priority", required_argument, NULL, 'l' },
 		{ "stop-exec-queue", no_argument, NULL, 's' },
 		{ "start-exec-queue", no_argument, NULL, 'S' },
+		{ "reload", no_argument, NULL, 'R' },
 		{ "reload-rules", no_argument, NULL, 'R' },
 		{ "property", required_argument, NULL, 'p' },
 		{ "env", required_argument, NULL, 'p' },
@@ -111,7 +112,7 @@ static int adm_control(struct udev *udev, int argc, char *argv[])
 				rc = 0;
 			break;
 		case 'R':
-			if (udev_ctrl_send_reload_rules(uctrl, timeout) < 0)
+			if (udev_ctrl_send_reload(uctrl, timeout) < 0)
 				rc = 2;
 			else
 				rc = 0;
diff --git a/udev/udevadm-test-builtin.c b/udev/udevadm-test-builtin.c
index 66043c76..253fcd0c 100644
--- a/udev/udevadm-test-builtin.c
+++ b/udev/udevadm-test-builtin.c
@@ -124,4 +124,5 @@ const struct udevadm_cmd udevadm_test_builtin = {
 	.name = "test-builtin",
 	.cmd = adm_builtin,
 	.help = "test a built-in command",
+	.debug = true,
 };
diff --git a/udev/udevadm.xml b/udev/udevadm.xml
index 09c22c44..455ce80c 100644
--- a/udev/udevadm.xml
+++ b/udev/udevadm.xml
@@ -339,12 +339,11 @@
           </listitem>
         </varlistentry>
         <varlistentry>
-          <term><option>--reload-rules</option></term>
+          <term><option>--reload</option></term>
           <listitem>
-            <para>Signal udevd to reload the rules files.
-            The udev daemon detects changes automatically, this option is
-            usually not needed. Reloading rules does not apply any changes
-            to already existing devices.</para>
+            <para>Signal udevd to reload the rules files and other databases like the kernel
+            module index. Reloading rules and databases does not apply any changes to already
+            existing devices; the new configuration will only be applied to new events.</para>
           </listitem>
         </varlistentry>
         <varlistentry>
diff --git a/udev/udevd.c b/udev/udevd.c
index 3a39b6a5..299f5d3f 100644
--- a/udev/udevd.c
+++ b/udev/udevd.c
@@ -76,7 +76,7 @@ static int fd_signal = -1;
 static int fd_ep = -1;
 static int fd_inotify = -1;
 static bool stop_exec_queue;
-static bool reload_config;
+static bool reload;
 static int children;
 static int children_max;
 static int exec_delay;
@@ -662,9 +662,9 @@ static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl)
 		stop_exec_queue = false;
 	}
 
-	if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
-		info(udev, "udevd message (RELOAD_RULES) received\n");
-		reload_config = true;
+	if (udev_ctrl_get_reload(ctrl_msg) > 0) {
+		info(udev, "udevd message (RELOAD) received\n");
+		reload = true;
 	}
 
 	str = udev_ctrl_get_set_env(ctrl_msg);
@@ -745,7 +745,7 @@ static int handle_inotify(struct udev *udev)
 				continue;
 			if (strlen(s) != strlen(".rules"))
 				continue;
-			reload_config = true;
+			reload = true;
 			continue;
 		}
 
@@ -831,7 +831,7 @@ static void handle_signal(struct udev *udev, int signo)
 		}
 		break;
 	case SIGHUP:
-		reload_config = true;
+		reload = true;
 		break;
 	}
 }
@@ -1658,8 +1658,12 @@ int main(int argc, char *argv[])
 		}
 
 		/* start new events */
-		if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue)
-			event_queue_start(udev);
+		if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
+			if (rules == NULL)
+				rules = udev_rules_new(udev, resolve_names);
+			if (rules != NULL)
+				event_queue_start(udev);
+		}
 
 		if (is_signal) {
 			struct signalfd_siginfo fdsi;
@@ -1691,19 +1695,11 @@ int main(int argc, char *argv[])
 			ctrl_conn = handle_ctrl_msg(udev_ctrl);
 
 		/* rules changed, set by inotify or a HUP signal */
-		if (reload_config) {
-			struct udev_rules *rules_new;
-
+		if (reload) {
 			worker_kill(udev, 0);
-			rules_new = udev_rules_new(udev, resolve_names);
-			if (rules_new != NULL) {
-				udev_rules_unref(rules);
-				rules = rules_new;
-			}
-			reload_config = 0;
-
+			rules = udev_rules_unref(rules);
 			udev_builtin_exit(udev);
-			udev_builtin_init(udev);
+			reload = 0;
 		}
 	}