remove old symlinks before creating current ones

This will prevent incorrect symlinks when a filesystem
label is changed and the event is triggered again from
sysfs.

4 files changed, 34 insertions, 8 deletions

diff --git a/.gitignore b/.gitignore
index b9adf69f..499e9c4d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@ udev
 udevd
 udevcontrol
 udevtrigger
+udevsettle
 udevsend
 udevinfo
 udevmonitor
diff --git a/udev.h b/udev.h
index 615253a5..94d1676c 100644
--- a/udev.h
+++ b/udev.h
@@ -119,7 +119,8 @@ extern char *sysfs_attr_get_value(const char *devpath, const char *attr_name);
 
 /* udev_node.c */
 extern int udev_node_mknod(struct udevice *udev, const char *file, dev_t devt, mode_t mode, uid_t uid, gid_t gid);
-extern int udev_node_add(struct udevice *udev);
+extern int udev_node_add(struct udevice *udev, struct udevice *udev_old);
+extern void udev_node_remove_symlinks(struct udevice *udev);
 extern int udev_node_remove(struct udevice *udev);
 
 /* udev_db.c */
diff --git a/udev_device.c b/udev_device.c
index 84d0ab22..b356f163 100644
--- a/udev_device.c
+++ b/udev_device.c
@@ -114,7 +114,10 @@ int udev_device_event(struct udev_rules *rules, struct udevice *udev)
 
 	/* add device node */
 	if (major(udev->devt) != 0 && strcmp(udev->action, "add") == 0) {
+		struct udevice *udev_old;
+
 		dbg("device node add '%s'", udev->dev->devpath);
+
 		udev_rules_get_name(rules, udev);
 		if (udev->ignore_device) {
 			info("device event will be ignored");
@@ -124,8 +127,19 @@ int udev_device_event(struct udev_rules *rules, struct udevice *udev)
 			info("device node creation supressed");
 			goto exit;
 		}
-		/* create node, store in db */
-		retval = udev_node_add(udev);
+
+		/* read current database entry, we may want to cleanup symlinks */
+		udev_old = udev_device_init();
+		if (udev_old != NULL) {
+			if (udev_db_get_device(udev_old, udev->dev->devpath) == 0) {
+				info("device '%s' already known, remove possible symlinks", udev->dev->devpath);
+				udev_node_remove_symlinks(udev_old);
+			}
+			udev_device_cleanup(udev_old);
+		}
+
+		/* create node and symlinks, store record in database */
+		retval = udev_node_add(udev, udev_old);
 		if (retval == 0)
 			udev_db_add_device(udev);
 		goto exit;
diff --git a/udev_node.c b/udev_node.c
index 9d6e89cf..d2889a32 100644
--- a/udev_node.c
+++ b/udev_node.c
@@ -90,7 +90,7 @@ exit:
 	return retval;
 }
 
-int udev_node_add(struct udevice *udev)
+int udev_node_add(struct udevice *udev, struct udevice *udev_old)
 {
 	char filename[PATH_SIZE];
 	struct name_entry *name_loop;
@@ -226,15 +226,12 @@ exit:
 	return retval;
 }
 
-int udev_node_remove(struct udevice *udev)
+void udev_node_remove_symlinks(struct udevice *udev)
 {
 	char filename[PATH_SIZE];
-	char partitionname[PATH_SIZE];
 	struct name_entry *name_loop;
 	struct stat stats;
 	int retval;
-	int i;
-	int num;
 
 	if (!list_empty(&udev->symlink_list)) {
 		char symlinks[512] = "";
@@ -266,6 +263,17 @@ int udev_node_remove(struct udevice *udev)
 		if (symlinks[0] != '\0')
 			setenv("DEVLINKS", symlinks, 1);
 	}
+}
+
+int udev_node_remove(struct udevice *udev)
+{
+	char filename[PATH_SIZE];
+	char partitionname[PATH_SIZE];
+	struct stat stats;
+	int retval;
+	int num;
+
+	udev_node_remove_symlinks(udev);
 
 	snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
 	filename[sizeof(filename)-1] = '\0';
@@ -288,6 +296,8 @@ int udev_node_remove(struct udevice *udev)
 
 	num = udev->partitions;
 	if (num > 0) {
+		int i;
+
 		info("removing all_partitions '%s[1-%i]'", filename, num);
 		if (num > 255) {
 			info("garbage from udev database, skip all_partitions removal");