X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=libudev%2Flibudev-device.c;h=064ffad9bf3c2efadfa19c3bbdbce45a504dec79;hp=b3b6a63114106f973327b5a594762df6c5bdc293;hb=a20a57a7bfbc6edd7602c135ca78f3e56878badb;hpb=a89d342dfb45b54e29381af9dbc495bbb2b057af

diff --git a/libudev/libudev-device.c b/libudev/libudev-device.c
index b3b6a6311..064ffad9b 100644
--- a/libudev/libudev-device.c
+++ b/libudev/libudev-device.c
@@ -19,7 +19,11 @@
 #include <dirent.h>
 #include <fcntl.h>
 #include <ctype.h>
+#include <net/if.h>
 #include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <linux/sockios.h>
 
 #include "libudev.h"
 #include "libudev-private.h"
@@ -47,39 +51,303 @@ struct udev_device {
 	char *sysname;
 	const char *sysnum;
 	char *devnode;
+	mode_t devnode_mode;
 	char *subsystem;
 	char *devtype;
 	char *driver;
 	char *action;
 	char *devpath_old;
-	char *sysname_old;
 	char *knodename;
+	char *id_filename;
 	char **envp;
 	char *monitor_buf;
 	size_t monitor_buf_len;
-	struct udev_list_node devlinks_list;
-	struct udev_list_node properties_list;
-	struct udev_list_node sysattr_list;
+	struct udev_list devlinks_list;
+	struct udev_list properties_list;
+	struct udev_list sysattr_value_list;
+	struct udev_list sysattr_list;
+	struct udev_list tags_list;
 	unsigned long long int seqnum;
-	int event_timeout;
+	unsigned long long int usec_initialized;
 	int timeout;
 	int devlink_priority;
 	int refcount;
 	dev_t devnum;
+	int ifindex;
 	int watch_handle;
 	int maj, min;
-	unsigned int parent_set:1;
-	unsigned int subsystem_set:1;
-	unsigned int devtype_set:1;
-	unsigned int devlinks_uptodate:1;
-	unsigned int envp_uptodate:1;
-	unsigned int driver_set:1;
-	unsigned int info_loaded:1;
+	bool parent_set;
+	bool subsystem_set;
+	bool devtype_set;
+	bool devlinks_uptodate;
+	bool envp_uptodate;
+	bool tags_uptodate;
+	bool driver_set;
+	bool info_loaded;
+	bool db_loaded;
+	bool uevent_loaded;
+	bool is_initialized;
+	bool sysattr_list_read;
+	bool db_persist;
 };
 
+/**
+ * udev_device_get_devnum:
+ * @udev_device: udev device
+ *
+ * This is only valid if the device was received through a monitor. Devices read from
+ * sys do not have a sequence number.
+ *
+ * Returns: the kernel event sequence number, or 0 if there is no sequence number available.
+ **/
+UDEV_EXPORT unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return 0;
+	return udev_device->seqnum;
+}
+
+static int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
+{
+	char num[32];
+
+	udev_device->seqnum = seqnum;
+	snprintf(num, sizeof(num), "%llu", seqnum);
+	udev_device_add_property(udev_device, "SEQNUM", num);
+	return 0;
+}
+
+int udev_device_get_ifindex(struct udev_device *udev_device)
+{
+	if (!udev_device->info_loaded)
+		udev_device_read_uevent_file(udev_device);
+	return udev_device->ifindex;
+}
+
+static int udev_device_set_ifindex(struct udev_device *udev_device, int ifindex)
+{
+	char num[32];
+
+	udev_device->ifindex = ifindex;
+	snprintf(num, sizeof(num), "%u", ifindex);
+	udev_device_add_property(udev_device, "IFINDEX", num);
+	return 0;
+}
+
+/**
+ * udev_device_get_devnum:
+ * @udev_device: udev device
+ *
+ * Returns: the device major/minor number.
+ **/
+UDEV_EXPORT dev_t udev_device_get_devnum(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return makedev(0, 0);
+	if (!udev_device->info_loaded)
+		udev_device_read_uevent_file(udev_device);
+	return udev_device->devnum;
+}
+
+static int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
+{
+	char num[32];
+
+	udev_device->devnum = devnum;
+
+	snprintf(num, sizeof(num), "%u", major(devnum));
+	udev_device_add_property(udev_device, "MAJOR", num);
+	snprintf(num, sizeof(num), "%u", minor(devnum));
+	udev_device_add_property(udev_device, "MINOR", num);
+	return 0;
+}
+
+int udev_device_get_timeout(struct udev_device *udev_device)
+{
+	return udev_device->timeout;
+}
+
+static int udev_device_set_timeout(struct udev_device *udev_device, int timeout)
+{
+	char num[32];
+
+	udev_device->timeout = timeout;
+	snprintf(num, sizeof(num), "%u", timeout);
+	udev_device_add_property(udev_device, "TIMEOUT", num);
+	return 0;
+}
+
+const char *udev_device_get_knodename(struct udev_device *udev_device)
+{
+	return udev_device->knodename;
+}
+
+static int udev_device_set_knodename(struct udev_device *udev_device, const char *knodename)
+{
+	free(udev_device->knodename);
+	udev_device->knodename = strdup(knodename);
+	if (udev_device->knodename == NULL)
+		return -ENOMEM;
+	/* do not overwrite the udev property with the kernel property */
+	if (udev_device->devnode == NULL)
+		udev_device_add_property(udev_device, "DEVNAME", udev_device->knodename);
+	return 0;
+}
+
+const char *udev_device_get_devpath_old(struct udev_device *udev_device)
+{
+	return udev_device->devpath_old;
+}
+
+static int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
+{
+	const char *pos;
+
+	free(udev_device->devpath_old);
+	udev_device->devpath_old = strdup(devpath_old);
+	if (udev_device->devpath_old == NULL)
+		return -ENOMEM;
+	udev_device_add_property(udev_device, "DEVPATH_OLD", udev_device->devpath_old);
+
+	pos = strrchr(udev_device->devpath_old, '/');
+	if (pos == NULL)
+		return -EINVAL;
+	return 0;
+}
+
+/**
+ * udev_device_get_driver:
+ * @udev_device: udev device
+ *
+ * Returns: the driver string, or #NULL if there is no driver attached.
+ **/
+UDEV_EXPORT const char *udev_device_get_driver(struct udev_device *udev_device)
+{
+	char driver[UTIL_NAME_SIZE];
+
+	if (udev_device == NULL)
+		return NULL;
+	if (!udev_device->driver_set) {
+		udev_device->driver_set = true;
+		if (util_get_sys_core_link_value(udev_device->udev, "driver", udev_device->syspath, driver, sizeof(driver)) > 0)
+			udev_device->driver = strdup(driver);
+	}
+	return udev_device->driver;
+}
+
+static int udev_device_set_driver(struct udev_device *udev_device, const char *driver)
+{
+	free(udev_device->driver);
+	udev_device->driver = strdup(driver);
+	if (udev_device->driver == NULL)
+		return -ENOMEM;
+	udev_device->driver_set = true;
+	udev_device_add_property(udev_device, "DRIVER", udev_device->driver);
+	return 0;
+}
+
+/**
+ * udev_device_get_devtype:
+ * @udev_device: udev device
+ *
+ * Retrieve the devtype string of the udev device.
+ *
+ * Returns: the devtype name of the udev device, or #NULL if it can not be determined
+ **/
+UDEV_EXPORT const char *udev_device_get_devtype(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	if (!udev_device->devtype_set) {
+		udev_device->devtype_set = true;
+		udev_device_read_uevent_file(udev_device);
+	}
+	return udev_device->devtype;
+}
+
+static int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype)
+{
+	free(udev_device->devtype);
+	udev_device->devtype = strdup(devtype);
+	if (udev_device->devtype == NULL)
+		return -ENOMEM;
+	udev_device->devtype_set = true;
+	udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype);
+	return 0;
+}
+
+static int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
+{
+	free(udev_device->subsystem);
+	udev_device->subsystem = strdup(subsystem);
+	if (udev_device->subsystem == NULL)
+		return -ENOMEM;
+	udev_device->subsystem_set = true;
+	udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem);
+	return 0;
+}
+
+/**
+ * udev_device_get_subsystem:
+ * @udev_device: udev device
+ *
+ * Retrieve the subsystem string of the udev device. The string does not
+ * contain any "/".
+ *
+ * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
+ **/
+UDEV_EXPORT const char *udev_device_get_subsystem(struct udev_device *udev_device)
+{
+	char subsystem[UTIL_NAME_SIZE];
+
+	if (udev_device == NULL)
+		return NULL;
+	if (!udev_device->subsystem_set) {
+		udev_device->subsystem_set = true;
+		/* read "subsystem" link */
+		if (util_get_sys_core_link_value(udev_device->udev, "subsystem", udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
+			udev_device_set_subsystem(udev_device, subsystem);
+			return udev_device->subsystem;
+		}
+		/* implicit names */
+		if (strncmp(udev_device->devpath, "/module/", 8) == 0) {
+			udev_device_set_subsystem(udev_device, "module");
+			return udev_device->subsystem;
+		}
+		if (strstr(udev_device->devpath, "/drivers/") != NULL) {
+			udev_device_set_subsystem(udev_device, "drivers");
+			return udev_device->subsystem;
+		}
+		if (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 ||
+		    strncmp(udev_device->devpath, "/class/", 7) == 0 ||
+		    strncmp(udev_device->devpath, "/bus/", 5) == 0) {
+			udev_device_set_subsystem(udev_device, "subsystem");
+			return udev_device->subsystem;
+		}
+	}
+	return udev_device->subsystem;
+}
+
+mode_t udev_device_get_devnode_mode(struct udev_device *udev_device)
+{
+	if (!udev_device->info_loaded)
+		udev_device_read_uevent_file(udev_device);
+	return udev_device->devnode_mode;
+}
+
+static int udev_device_set_devnode_mode(struct udev_device *udev_device, mode_t mode)
+{
+	char num[32];
+
+	udev_device->devnode_mode = mode;
+	snprintf(num, sizeof(num), "%#o", mode);
+	udev_device_add_property(udev_device, "DEVMODE", num);
+	return 0;
+}
+
 struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
 {
-	udev_device->envp_uptodate = 0;
+	udev_device->envp_uptodate = false;
 	if (value == NULL) {
 		struct udev_list_entry *list_entry;
 
@@ -89,7 +357,7 @@ struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device
 			udev_list_entry_delete(list_entry);
 		return NULL;
 	}
-	return udev_list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0);
+	return udev_list_entry_add(&udev_device->properties_list, key, value);
 }
 
 static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
@@ -149,6 +417,28 @@ void udev_device_add_property_from_string_parse(struct udev_device *udev_device,
 		}
 		if (slink[0] != '\0')
 			udev_device_add_devlink(udev_device, slink, 0);
+	} else if (strncmp(property, "TAGS=", 5) == 0) {
+		char tags[UTIL_PATH_SIZE];
+		char *next;
+
+		util_strscpy(tags, sizeof(tags), &property[5]);
+		next = strchr(tags, ':');
+		if (next != NULL) {
+			next++;
+			while (next[0] != '\0') {
+				char *tag;
+
+				tag = next;
+				next = strchr(tag, ':');
+				if (next == NULL)
+					break;
+				next[0] = '\0';
+				next++;
+				udev_device_add_tag(udev_device, tag);
+			}
+		}
+	} else if (strncmp(property, "USEC_INITIALIZED=", 19) == 0) {
+		udev_device_set_usec_initialized(udev_device, strtoull(&property[19], NULL, 10));
 	} else if (strncmp(property, "DRIVER=", 7) == 0) {
 		udev_device_set_driver(udev_device, &property[7]);
 	} else if (strncmp(property, "ACTION=", 7) == 0) {
@@ -163,6 +453,10 @@ void udev_device_add_property_from_string_parse(struct udev_device *udev_device,
 		udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10));
 	} else if (strncmp(property, "TIMEOUT=", 8) == 0) {
 		udev_device_set_timeout(udev_device, strtoull(&property[8], NULL, 10));
+	} else if (strncmp(property, "IFINDEX=", 8) == 0) {
+		udev_device_set_ifindex(udev_device, strtoull(&property[8], NULL, 10));
+	} else if (strncmp(property, "DEVMODE=", 8) == 0) {
+		udev_device_set_devnode_mode(udev_device, strtoul(&property[8], NULL, 8));
 	} else {
 		udev_device_add_property_from_string(udev_device, property);
 	}
@@ -187,7 +481,7 @@ int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_d
  *
  * Returns: the value of a device property, or #NULL if there is no such property.
  **/
-const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
+UDEV_EXPORT const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
 {
 	struct udev_list_entry *list_entry;
 
@@ -197,70 +491,42 @@ const char *udev_device_get_property_value(struct udev_device *udev_device, cons
 		return NULL;
 
 	list_entry = udev_device_get_properties_list_entry(udev_device);
-	list_entry =  udev_list_entry_get_by_name(list_entry, key);
+	list_entry = udev_list_entry_get_by_name(list_entry, key);
 	return udev_list_entry_get_value(list_entry);
 }
 
-int udev_device_read_db(struct udev_device *udev_device)
+int udev_device_read_db(struct udev_device *udev_device, const char *dbfile)
 {
-	struct stat stats;
 	char filename[UTIL_PATH_SIZE];
 	char line[UTIL_LINE_SIZE];
 	FILE *f;
 
-	util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/.udev/db/",
-		      udev_device_get_subsystem(udev_device), ":", udev_device_get_sysname(udev_device), NULL);
+	/* providing a database file will always force-load it */
+	if (dbfile == NULL) {
+		const char *id;
 
-	if (lstat(filename, &stats) != 0) {
-		dbg(udev_device->udev, "no db file to read %s: %m\n", filename);
-		return -1;
-	}
-	if ((stats.st_mode & S_IFMT) == S_IFLNK) {
-		char target[UTIL_PATH_SIZE];
-		char devnode[UTIL_PATH_SIZE];
-		int target_len;
-		char *next;
+		if (udev_device->db_loaded)
+			return 0;
+		udev_device->db_loaded = true;
 
-		target_len = readlink(filename, target, sizeof(target));
-		if (target_len > 0)
-			target[target_len] = '\0';
-		else {
-			dbg(udev_device->udev, "error reading db link %s: %m\n", filename);
+		id = udev_device_get_id_filename(udev_device);
+		if (id == NULL)
 			return -1;
-		}
-
-		next = strchr(target, ' ');
-		if (next != NULL) {
-			next[0] = '\0';
-			next = &next[1];
-		}
-		util_strscpyl(devnode, sizeof(devnode), udev_get_dev_path(udev_device->udev), "/", target, NULL);
-		udev_device_set_devnode(udev_device, devnode);
-		while (next != NULL) {
-			char devlink[UTIL_PATH_SIZE];
-			const char *lnk;
-
-			lnk = next;
-			next = strchr(next, ' ');
-			if (next != NULL) {
-				next[0] = '\0';
-				next = &next[1];
-			}
-			util_strscpyl(devlink, sizeof(devlink), udev_get_dev_path(udev_device->udev), "/", lnk, NULL);
-			udev_device_add_devlink(udev_device, devlink, 0);
-		}
-		info(udev_device->udev, "device %p filled with db symlink data '%s'\n", udev_device, udev_device->devnode);
-		return 0;
+		util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev_device->udev), "/data/", id, NULL);
+		dbfile = filename;
 	}
 
-	f = fopen(filename, "r");
+	f = fopen(dbfile, "re");
 	if (f == NULL) {
-		dbg(udev_device->udev, "error reading db file %s: %m\n", filename);
+		info(udev_device->udev, "no db file to read %s: %m\n", dbfile);
 		return -1;
 	}
+	udev_device->is_initialized = true;
+
 	while (fgets(line, sizeof(line), f)) {
 		ssize_t len;
 		const char *val;
+		struct udev_list_entry *entry;
 
 		len = strlen(line);
 		if (len < 4)
@@ -279,15 +545,19 @@ int udev_device_read_db(struct udev_device *udev_device)
 		case 'L':
 			udev_device_set_devlink_priority(udev_device, atoi(val));
 			break;
-		case 'T':
-			udev_device_set_event_timeout(udev_device, atoi(val));
-			break;
 		case 'E':
-			udev_device_add_property_from_string(udev_device, val);
+			entry = udev_device_add_property_from_string(udev_device, val);
+			udev_list_entry_set_num(entry, true);
+			break;
+		case 'G':
+			udev_device_add_tag(udev_device, val);
 			break;
 		case 'W':
 			udev_device_set_watch_handle(udev_device, atoi(val));
 			break;
+		case 'I':
+			udev_device_set_usec_initialized(udev_device, strtoull(val, NULL, 10));
+			break;
 		}
 	}
 	fclose(f);
@@ -304,10 +574,14 @@ int udev_device_read_uevent_file(struct udev_device *udev_device)
 	int maj = 0;
 	int min = 0;
 
+	if (udev_device->uevent_loaded)
+		return 0;
+
 	util_strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL);
-	f = fopen(filename, "r");
+	f = fopen(filename, "re");
 	if (f == NULL)
 		return -1;
+	udev_device->uevent_loaded = true;
 
 	while (fgets(line, sizeof(line), f)) {
 		char *pos;
@@ -323,28 +597,24 @@ int udev_device_read_uevent_file(struct udev_device *udev_device)
 			maj = strtoull(&line[6], NULL, 10);
 		else if (strncmp(line, "MINOR=", 6) == 0)
 			min = strtoull(&line[6], NULL, 10);
+		else if (strncmp(line, "IFINDEX=", 8) == 0)
+			udev_device_set_ifindex(udev_device, strtoull(&line[8], NULL, 10));
 		else if (strncmp(line, "DEVNAME=", 8) == 0)
 			udev_device_set_knodename(udev_device, &line[8]);
+		else if (strncmp(line, "DEVMODE=", 8) == 0)
+			udev_device->devnode_mode = strtoul(&line[8], NULL, 8);
 
 		udev_device_add_property_from_string(udev_device, line);
 	}
 
 	udev_device->devnum = makedev(maj, min);
-
 	fclose(f);
 	return 0;
 }
 
-static void device_load_info(struct udev_device *device)
-{
-	device->info_loaded = 1;
-	udev_device_read_uevent_file(device);
-	udev_device_read_db(device);
-}
-
 void udev_device_set_info_loaded(struct udev_device *device)
 {
-	device->info_loaded = 1;
+	device->info_loaded = true;
 }
 
 struct udev_device *udev_device_new(struct udev *udev)
@@ -360,10 +630,12 @@ struct udev_device *udev_device_new(struct udev *udev)
 		return NULL;
 	udev_device->refcount = 1;
 	udev_device->udev = udev;
-	udev_list_init(&udev_device->devlinks_list);
-	udev_list_init(&udev_device->properties_list);
-	udev_list_init(&udev_device->sysattr_list);
-	udev_device->event_timeout = -1;
+	udev_list_init(udev, &udev_device->devlinks_list, true);
+	udev_list_init(udev, &udev_device->properties_list, true);
+	udev_list_init(udev, &udev_device->sysattr_value_list, true);
+	udev_list_init(udev, &udev_device->sysattr_list, false);
+	udev_list_init(udev, &udev_device->tags_list, true);
+	udev_device->timeout = -1;
 	udev_device->watch_handle = -1;
 	/* copy global properties */
 	udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev))
@@ -388,7 +660,7 @@ struct udev_device *udev_device_new(struct udev *udev)
  *
  * Returns: a new udev device, or #NULL, if it does not exist
  **/
-struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
+UDEV_EXPORT struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
 {
 	size_t len;
 	const char *subdir;
@@ -421,7 +693,7 @@ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *
 	util_strscpy(path, sizeof(path), syspath);
 	util_resolve_sys_link(udev, path, sizeof(path));
 
-	if (strncmp(&syspath[len], "/devices/", 9) == 0) {
+	if (strncmp(&path[len], "/devices/", 9) == 0) {
 		char file[UTIL_PATH_SIZE];
 
 		/* all "devices" require a "uevent" file */
@@ -464,7 +736,7 @@ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *
  *
  * Returns: a new udev device, or #NULL, if it does not exist
  **/
-struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
+UDEV_EXPORT struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
 {
 	char path[UTIL_PATH_SIZE];
 	const char *type_str;
@@ -482,22 +754,77 @@ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, de
 	return udev_device_new_from_syspath(udev, path);
 }
 
-/**
- * udev_device_new_from_subsystem_sysname:
- * @udev: udev library context
- * @subsystem: the subsystem of the device
- * @sysname: the name of the device
- *
- * Create new udev device, and fill in information from the sys device
- * and the udev database entry. The device is looked up by the subsystem
- * and name string of the device, like "mem" / "zero", or "block" / "sda".
- *
- * The initial refcount is 1, and needs to be decremented to
- * release the resources of the udev device.
- *
+struct udev_device *udev_device_new_from_id_filename(struct udev *udev, char *id)
+{
+	char type;
+	int maj, min;
+	char subsys[UTIL_PATH_SIZE];
+	char *sysname;
+
+	switch(id[0]) {
+	case 'b':
+	case 'c':
+		if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3)
+			return NULL;
+		return udev_device_new_from_devnum(udev, type, makedev(maj, min));
+	case 'n': {
+		int sk;
+		struct ifreq ifr;
+		struct udev_device *dev;
+		int ifindex;
+
+		ifindex = strtoul(&id[1], NULL, 10);
+		if (ifindex <= 0)
+			return NULL;
+
+		sk = socket(PF_INET, SOCK_DGRAM, 0);
+		if (sk < 0)
+			return NULL;
+		memset(&ifr, 0x00, sizeof(struct ifreq));
+		ifr.ifr_ifindex = ifindex;
+		if (ioctl(sk, SIOCGIFNAME, &ifr) != 0) {
+			close(sk);
+			return NULL;
+		}
+		close(sk);
+
+		dev = udev_device_new_from_subsystem_sysname(udev, "net", ifr.ifr_name);
+		if (dev == NULL)
+			return NULL;
+		if (udev_device_get_ifindex(dev) == ifindex)
+			return dev;
+		udev_device_unref(dev);
+		return NULL;
+	}
+	case '+':
+		util_strscpy(subsys, sizeof(subsys), &id[1]);
+		sysname = strchr(subsys, ':');
+		if (sysname == NULL)
+			return NULL;
+		sysname[0] = '\0';
+		sysname = &sysname[1];
+		return udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
+	default:
+		return NULL;
+	}
+}
+
+/**
+ * udev_device_new_from_subsystem_sysname:
+ * @udev: udev library context
+ * @subsystem: the subsystem of the device
+ * @sysname: the name of the device
+ *
+ * Create new udev device, and fill in information from the sys device
+ * and the udev database entry. The device is looked up by the subsystem
+ * and name string of the device, like "mem" / "zero", or "block" / "sda".
+ *
+ * The initial refcount is 1, and needs to be decremented to
+ * release the resources of the udev device.
+ *
  * Returns: a new udev device, or #NULL, if it does not exist
  **/
-struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
+UDEV_EXPORT struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
 {
 	char path_full[UTIL_PATH_SIZE];
 	char *path;
@@ -581,7 +908,7 @@ found:
  *
  * Returns: a new udev device, or #NULL, if it does not exist
  **/
-struct udev_device *udev_device_new_from_environment(struct udev *udev)
+UDEV_EXPORT struct udev_device *udev_device_new_from_environment(struct udev *udev)
 {
 	int i;
 	struct udev_device *udev_device;
@@ -644,12 +971,12 @@ static struct udev_device *device_new_from_parent(struct udev_device *udev_devic
  *
  * Returns: a new udev device, or #NULL, if it no parent exist.
  **/
-struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
+UDEV_EXPORT struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
 	if (!udev_device->parent_set) {
-		udev_device->parent_set = 1;
+		udev_device->parent_set = true;
 		udev_device->parent_device = device_new_from_parent(udev_device);
 	}
 	if (udev_device->parent_device != NULL)
@@ -679,7 +1006,7 @@ struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
  *
  * Returns: a new udev device, or #NULL if no matching parent exists.
  **/
-struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
+UDEV_EXPORT struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
 {
 	struct udev_device *parent;
 
@@ -712,7 +1039,7 @@ struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_de
  *
  * Returns: the udev library context
  **/
-struct udev *udev_device_get_udev(struct udev_device *udev_device)
+UDEV_EXPORT struct udev *udev_device_get_udev(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
@@ -727,7 +1054,7 @@ struct udev *udev_device_get_udev(struct udev_device *udev_device)
  *
  * Returns: the passed udev device
  **/
-struct udev_device *udev_device_ref(struct udev_device *udev_device)
+UDEV_EXPORT struct udev_device *udev_device_ref(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
@@ -743,7 +1070,7 @@ struct udev_device *udev_device_ref(struct udev_device *udev_device)
  * the resources of the device will be released.
  *
  **/
-void udev_device_unref(struct udev_device *udev_device)
+UDEV_EXPORT void udev_device_unref(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return;
@@ -757,14 +1084,16 @@ void udev_device_unref(struct udev_device *udev_device)
 	free(udev_device->devnode);
 	free(udev_device->subsystem);
 	free(udev_device->devtype);
-	udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
-	udev_list_cleanup_entries(udev_device->udev, &udev_device->properties_list);
+	udev_list_cleanup(&udev_device->devlinks_list);
+	udev_list_cleanup(&udev_device->properties_list);
+	udev_list_cleanup(&udev_device->sysattr_value_list);
+	udev_list_cleanup(&udev_device->sysattr_list);
+	udev_list_cleanup(&udev_device->tags_list);
 	free(udev_device->action);
 	free(udev_device->driver);
 	free(udev_device->devpath_old);
-	free(udev_device->sysname_old);
 	free(udev_device->knodename);
-	udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_list);
+	free(udev_device->id_filename);
 	free(udev_device->envp);
 	free(udev_device->monitor_buf);
 	dbg(udev_device->udev, "udev_device: %p released\n", udev_device);
@@ -780,7 +1109,7 @@ void udev_device_unref(struct udev_device *udev_device)
  *
  * Returns: the devpath of the udev device
  **/
-const char *udev_device_get_devpath(struct udev_device *udev_device)
+UDEV_EXPORT const char *udev_device_get_devpath(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
@@ -796,7 +1125,7 @@ const char *udev_device_get_devpath(struct udev_device *udev_device)
  *
  * Returns: the sys path of the udev device
  **/
-const char *udev_device_get_syspath(struct udev_device *udev_device)
+UDEV_EXPORT const char *udev_device_get_syspath(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
@@ -809,7 +1138,7 @@ const char *udev_device_get_syspath(struct udev_device *udev_device)
  *
  * Returns: the sys name of the device device
  **/
-const char *udev_device_get_sysname(struct udev_device *udev_device)
+UDEV_EXPORT const char *udev_device_get_sysname(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
@@ -822,7 +1151,7 @@ const char *udev_device_get_sysname(struct udev_device *udev_device)
  *
  * Returns: the trailing number of of the device name
  **/
-const char *udev_device_get_sysnum(struct udev_device *udev_device)
+UDEV_EXPORT const char *udev_device_get_sysnum(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
@@ -838,74 +1167,26 @@ const char *udev_device_get_sysnum(struct udev_device *udev_device)
  *
  * Returns: the device node file name of the udev device, or #NULL if no device node exists
  **/
-const char *udev_device_get_devnode(struct udev_device *udev_device)
+UDEV_EXPORT const char *udev_device_get_devnode(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
-	if (!udev_device->info_loaded)
-		device_load_info(udev_device);
-	return udev_device->devnode;
-}
+	if (!udev_device->info_loaded) {
+		udev_device_read_uevent_file(udev_device);
+		udev_device_read_db(udev_device, NULL);
+	}
 
-/**
- * udev_device_get_subsystem:
- * @udev_device: udev device
- *
- * Retrieve the subsystem string of the udev device. The string does not
- * contain any "/".
- *
- * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
- **/
-const char *udev_device_get_subsystem(struct udev_device *udev_device)
-{
-	char subsystem[UTIL_NAME_SIZE];
+	/* we might get called before we handled an event and have a db, use the kernel-provided name */
+	if (udev_device->devnode == NULL && udev_device_get_knodename(udev_device) != NULL) {
+		char filename[UTIL_NAME_SIZE];
 
-	if (udev_device == NULL)
-		return NULL;
-	if (!udev_device->subsystem_set) {
-		udev_device->subsystem_set = 1;
-		/* read "subsystem" link */
-		if (util_get_sys_subsystem(udev_device->udev, udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
-			udev_device_set_subsystem(udev_device, subsystem);
-			return udev_device->subsystem;
-		}
-		/* implicit names */
-		if (strncmp(udev_device->devpath, "/module/", 8) == 0) {
-			udev_device_set_subsystem(udev_device, "module");
-			return udev_device->subsystem;
-		}
-		if (strstr(udev_device->devpath, "/drivers/") != NULL) {
-			udev_device_set_subsystem(udev_device, "drivers");
-			return udev_device->subsystem;
-		}
-		if (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 ||
-		    strncmp(udev_device->devpath, "/class/", 7) == 0 ||
-		    strncmp(udev_device->devpath, "/bus/", 5) == 0) {
-			udev_device_set_subsystem(udev_device, "subsystem");
-			return udev_device->subsystem;
-		}
+		util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/",
+			      udev_device_get_knodename(udev_device), NULL);
+		udev_device_set_devnode(udev_device, filename);
+		return udev_device->devnode;
 	}
-	return udev_device->subsystem;
-}
 
-/**
- * udev_device_get_devtype:
- * @udev_device: udev device
- *
- * Retrieve the devtype string of the udev device.
- *
- * Returns: the devtype name of the udev device, or #NULL if it can not be determined
- **/
-const char *udev_device_get_devtype(struct udev_device *udev_device)
-{
-	if (udev_device == NULL)
-		return NULL;
-	if (!udev_device->devtype_set) {
-		udev_device->devtype_set = 1;
-		if (!udev_device->info_loaded)
-			udev_device_read_uevent_file(udev_device);
-	}
-	return udev_device->devtype;
+	return udev_device->devnode;
 }
 
 /**
@@ -921,19 +1202,19 @@ const char *udev_device_get_devtype(struct udev_device *udev_device)
  *
  * Returns: the first entry of the device node link list
  **/
-struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
+UDEV_EXPORT struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
 	if (!udev_device->info_loaded)
-		device_load_info(udev_device);
+		udev_device_read_db(udev_device, NULL);
 	return udev_list_get_entry(&udev_device->devlinks_list);
 }
 
 void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
 {
-	udev_device->devlinks_uptodate = 0;
-	udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
+	udev_device->devlinks_uptodate = false;
+	udev_list_cleanup(&udev_device->devlinks_list);
 }
 
 /**
@@ -948,17 +1229,19 @@ void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
  *
  * Returns: the first entry of the property list
  **/
-struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
+UDEV_EXPORT struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
-	if (!udev_device->info_loaded)
-		device_load_info(udev_device);
+	if (!udev_device->info_loaded) {
+		udev_device_read_uevent_file(udev_device);
+		udev_device_read_db(udev_device, NULL);
+	}
 	if (!udev_device->devlinks_uptodate) {
 		char symlinks[UTIL_PATH_SIZE];
 		struct udev_list_entry *list_entry;
 
-		udev_device->devlinks_uptodate = 1;
+		udev_device->devlinks_uptodate = true;
 		list_entry = udev_device_get_devlinks_list_entry(udev_device);
 		if (list_entry != NULL) {
 			char *s;
@@ -971,42 +1254,22 @@ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device
 			udev_device_add_property(udev_device, "DEVLINKS", symlinks);
 		}
 	}
-	return udev_list_get_entry(&udev_device->properties_list);
-}
-
-/**
- * udev_device_get_driver:
- * @udev_device: udev device
- *
- * Returns: the driver string, or #NULL if there is no driver attached.
- **/
-const char *udev_device_get_driver(struct udev_device *udev_device)
-{
-	char driver[UTIL_NAME_SIZE];
+	if (!udev_device->tags_uptodate) {
+		udev_device->tags_uptodate = true;
+		if (udev_device_get_tags_list_entry(udev_device) != NULL) {
+			char tags[UTIL_PATH_SIZE];
+			struct udev_list_entry *list_entry;
+			char *s;
+			size_t l;
 
-	if (udev_device == NULL)
-		return NULL;
-	if (!udev_device->driver_set) {
-		udev_device->driver_set = 1;
-		if (util_get_sys_driver(udev_device->udev, udev_device->syspath, driver, sizeof(driver)) > 0)
-			udev_device->driver = strdup(driver);
+			s = tags;
+			l = util_strpcpyl(&s, sizeof(tags), ":", NULL);
+			udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
+				l = util_strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL);
+			udev_device_add_property(udev_device, "TAGS", tags);
+		}
 	}
-	return udev_device->driver;
-}
-
-/**
- * udev_device_get_devnum:
- * @udev_device: udev device
- *
- * Returns: the device major/minor number.
- **/
-dev_t udev_device_get_devnum(struct udev_device *udev_device)
-{
-	if (udev_device == NULL)
-		return makedev(0, 0);
-	if (!udev_device->info_loaded)
-		device_load_info(udev_device);
-	return udev_device->devnum;
+	return udev_list_get_entry(&udev_device->properties_list);
 }
 
 /**
@@ -1019,7 +1282,7 @@ dev_t udev_device_get_devnum(struct udev_device *udev_device)
  *
  * Returns: the kernel action value, or #NULL if there is no action value available.
  **/
-const char *udev_device_get_action(struct udev_device *udev_device)
+UDEV_EXPORT const char *udev_device_get_action(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
@@ -1027,19 +1290,45 @@ const char *udev_device_get_action(struct udev_device *udev_device)
 }
 
 /**
- * udev_device_get_devnum:
+ * udev_device_get_usec_since_initialized:
  * @udev_device: udev device
  *
- * This is only valid if the device was received through a monitor. Devices read from
- * sys do not have a sequence number.
+ * Return the number of microseconds passed since udev set up the
+ * device for the first time.
  *
- * Returns: the kernel event sequence number, or 0 if there is no sequence number available.
+ * This is only implemented for devices with need to store properties
+ * in the udev database. All other devices return 0 here.
+ *
+ * Returns: the number of microseconds since the device was first seen.
  **/
-unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
+UDEV_EXPORT unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device)
 {
+	unsigned long long now;
+
 	if (udev_device == NULL)
 		return 0;
-	return udev_device->seqnum;
+	if (!udev_device->info_loaded)
+		udev_device_read_db(udev_device, NULL);
+	if (udev_device->usec_initialized == 0)
+		return 0;
+	now = now_usec();
+	if (now == 0)
+		return 0;
+	return now - udev_device->usec_initialized;
+}
+
+unsigned long long udev_device_get_usec_initialized(struct udev_device *udev_device)
+{
+	return udev_device->usec_initialized;
+}
+
+void udev_device_set_usec_initialized(struct udev_device *udev_device, unsigned long long usec_initialized)
+{
+	char num[32];
+
+	udev_device->usec_initialized = usec_initialized;
+	snprintf(num, sizeof(num), "%llu", usec_initialized);
+	udev_device_add_property(udev_device, "USEC_INITIALIZED", num);
 }
 
 /**
@@ -1052,7 +1341,7 @@ unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
  *
  * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
  **/
-const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
+UDEV_EXPORT const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
 {
 	struct udev_list_entry *list_entry;
 	char path[UTIL_PATH_SIZE];
@@ -1068,18 +1357,18 @@ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const
 		return NULL;
 
 	/* look for possibly already cached result */
-	udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_device->sysattr_list)) {
-		if (strcmp(udev_list_entry_get_name(list_entry), sysattr) == 0) {
-			dbg(udev_device->udev, "got '%s' (%s) from cache\n",
-			    sysattr, udev_list_entry_get_value(list_entry));
-			return udev_list_entry_get_value(list_entry);
-		}
+	list_entry = udev_list_get_entry(&udev_device->sysattr_value_list);
+	list_entry = udev_list_entry_get_by_name(list_entry, sysattr);
+	if (list_entry != NULL) {
+		dbg(udev_device->udev, "got '%s' (%s) from cache\n",
+		    sysattr, udev_list_entry_get_value(list_entry));
+		return udev_list_entry_get_value(list_entry);
 	}
 
 	util_strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL);
 	if (lstat(path, &statbuf) != 0) {
 		dbg(udev_device->udev, "no attribute '%s', keep negative entry\n", path);
-		udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, NULL, 0, 0);
+		udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, NULL);
 		goto out;
 	}
 
@@ -1095,16 +1384,18 @@ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const
 			goto out;
 
 		len = readlink(path, target, sizeof(target));
-		if (len > 0) {
-			target[len] = '\0';
-			pos = strrchr(target, '/');
-			if (pos != NULL) {
-				pos = &pos[1];
-				dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, pos);
-				list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, pos, 0, 0);
-				val = udev_list_entry_get_value(list_entry);
-			}
+		if (len <= 0 || len == sizeof(target))
+			goto out;
+		target[len] = '\0';
+
+		pos = strrchr(target, '/');
+		if (pos != NULL) {
+			pos = &pos[1];
+			dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, pos);
+			list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, pos);
+			val = udev_list_entry_get_value(list_entry);
 		}
+
 		goto out;
 	}
 
@@ -1117,7 +1408,7 @@ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const
 		goto out;
 
 	/* read attribute value */
-	fd = open(path, O_RDONLY);
+	fd = open(path, O_RDONLY|O_CLOEXEC);
 	if (fd < 0) {
 		dbg(udev_device->udev, "attribute '%s' can not be opened\n", path);
 		goto out;
@@ -1133,12 +1424,77 @@ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const
 	value[size] = '\0';
 	util_remove_trailing_chars(value, '\n');
 	dbg(udev_device->udev, "'%s' has attribute value '%s'\n", path, value);
-	list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, value, 0, 0);
+	list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
 	val = udev_list_entry_get_value(list_entry);
 out:
 	return val;
 }
 
+static int udev_device_sysattr_list_read(struct udev_device *udev_device)
+{
+	struct dirent *dent;
+	DIR *dir;
+	int num = 0;
+
+	if (udev_device == NULL)
+		return -1;
+	if (udev_device->sysattr_list_read)
+		return 0;
+
+	dir = opendir(udev_device_get_syspath(udev_device));
+	if (!dir) {
+		dbg(udev_device->udev, "sysfs dir '%s' can not be opened\n",
+				udev_device_get_syspath(udev_device));
+		return -1;
+	}
+
+	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+		char path[UTIL_PATH_SIZE];
+		struct stat statbuf;
+
+		/* only handle symlinks and regular files */
+		if (dent->d_type != DT_LNK && dent->d_type != DT_REG)
+			continue;
+
+		util_strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", dent->d_name, NULL);
+		if (lstat(path, &statbuf) != 0)
+			continue;
+		if ((statbuf.st_mode & S_IRUSR) == 0)
+			continue;
+
+		udev_list_entry_add(&udev_device->sysattr_list, dent->d_name, NULL);
+		num++;
+	}
+
+	closedir(dir);
+	dbg(udev_device->udev, "found %d sysattrs for '%s'\n", num, udev_device_get_syspath(udev_device));
+	udev_device->sysattr_list_read = true;
+
+	return num;
+}
+
+/**
+ * udev_device_get_sysattr_list_entry:
+ * @udev_device: udev device
+ *
+ * Retrieve the list of available sysattrs, with value being empty;
+ * This just return all available sysfs attributes for a particular
+ * device without reading their values.
+ *
+ * Returns: the first entry of the property list
+ **/
+UDEV_EXPORT struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
+{
+	if (!udev_device->sysattr_list_read) {
+		int ret;
+		ret = udev_device_sysattr_list_read(udev_device);
+		if (0 > ret)
+			return NULL;
+	}
+
+	return udev_list_get_entry(&udev_device->sysattr_list);
+}
+
 int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
 {
 	const char *pos;
@@ -1177,34 +1533,10 @@ int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath
 	return 0;
 }
 
-int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
-{
-	free(udev_device->subsystem);
-	udev_device->subsystem = strdup(subsystem);
-	if (udev_device->subsystem == NULL)
-		return -ENOMEM;
-	udev_device->subsystem_set = 1;
-	udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem);
-	return 0;
-}
-
-int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype)
-{
-	free(udev_device->devtype);
-	udev_device->devtype = strdup(devtype);
-	if (udev_device->devtype == NULL)
-		return -ENOMEM;
-	udev_device->devtype_set = 1;
-	udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype);
-	return 0;
-}
-
 int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
 {
 	free(udev_device->devnode);
 	udev_device->devnode = strdup(devnode);
-	if (devnode == NULL)
-		return 0;
 	if (udev_device->devnode == NULL)
 		return -ENOMEM;
 	udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
@@ -1215,15 +1547,124 @@ int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink
 {
 	struct udev_list_entry *list_entry;
 
-	udev_device->devlinks_uptodate = 0;
-	list_entry = udev_list_entry_add(udev_device->udev, &udev_device->devlinks_list, devlink, NULL, 1, 0);
+	udev_device->devlinks_uptodate = false;
+	list_entry = udev_list_entry_add(&udev_device->devlinks_list, devlink, NULL);
 	if (list_entry == NULL)
 		return -ENOMEM;
 	if (unique)
-		udev_list_entry_set_flags(list_entry, 1);
+		udev_list_entry_set_num(list_entry, true);
 	return 0;
 }
 
+const char *udev_device_get_id_filename(struct udev_device *udev_device)
+{
+	if (udev_device->id_filename == NULL) {
+		if (udev_device_get_subsystem(udev_device) == NULL)
+			return NULL;
+
+		if (major(udev_device_get_devnum(udev_device)) > 0) {
+			/* use dev_t -- b259:131072, c254:0 */
+			if (asprintf(&udev_device->id_filename, "%c%u:%u",
+				     strcmp(udev_device_get_subsystem(udev_device), "block") == 0 ? 'b' : 'c',
+				     major(udev_device_get_devnum(udev_device)),
+				     minor(udev_device_get_devnum(udev_device))) < 0)
+				udev_device->id_filename = NULL;
+		} else if (udev_device_get_ifindex(udev_device) > 0) {
+			/* use netdev ifindex -- n3 */
+			if (asprintf(&udev_device->id_filename, "n%u", udev_device_get_ifindex(udev_device)) < 0)
+				udev_device->id_filename = NULL;
+		} else {
+			/*
+			 * use $subsys:$syname -- pci:0000:00:1f.2
+			 * sysname() has '!' translated, get it from devpath
+			 */
+			const char *sysname;
+			sysname = strrchr(udev_device->devpath, '/');
+			if (sysname == NULL)
+				return NULL;
+			sysname = &sysname[1];
+			if (asprintf(&udev_device->id_filename, "+%s:%s", udev_device_get_subsystem(udev_device), sysname) < 0)
+				udev_device->id_filename = NULL;
+		}
+	}
+	return udev_device->id_filename;
+}
+
+/**
+ * udev_device_get_is_initialized:
+ * @udev_device: udev device
+ *
+ * Check if udev has already handled the device and has set up
+ * device node permissions and context, or has renamed a network
+ * device.
+ *
+ * This is only implemented for devices with a device node
+ * or network interfaces. All other devices return 1 here.
+ *
+ * Returns: 1 if the device is set up. 0 otherwise.
+ **/
+UDEV_EXPORT int udev_device_get_is_initialized(struct udev_device *udev_device)
+{
+	if (!udev_device->info_loaded)
+		udev_device_read_db(udev_device, NULL);
+	return udev_device->is_initialized;
+}
+
+void udev_device_set_is_initialized(struct udev_device *udev_device)
+{
+	udev_device->is_initialized = true;
+}
+
+int udev_device_add_tag(struct udev_device *udev_device, const char *tag)
+{
+	if (strchr(tag, ':') != NULL || strchr(tag, ' ') != NULL)
+		return -EINVAL;
+	udev_device->tags_uptodate = false;
+	if (udev_list_entry_add(&udev_device->tags_list, tag, NULL) != NULL)
+		return 0;
+	return -ENOMEM;
+}
+
+void udev_device_cleanup_tags_list(struct udev_device *udev_device)
+{
+	udev_device->tags_uptodate = false;
+	udev_list_cleanup(&udev_device->tags_list);
+}
+
+/**
+ * udev_device_get_tags_list_entry:
+ * @udev_device: udev device
+ *
+ * Retrieve the list of tags attached to the udev device. The next
+ * list entry can be retrieved with udev_list_entry_next(),
+ * which returns #NULL if no more entries exist. The tag string
+ * can be retrieved from the list entry by udev_list_get_name().
+ *
+ * Returns: the first entry of the tag list
+ **/
+UDEV_EXPORT struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	if (!udev_device->info_loaded)
+		udev_device_read_db(udev_device, NULL);
+	return udev_list_get_entry(&udev_device->tags_list);
+}
+
+UDEV_EXPORT int udev_device_has_tag(struct udev_device *udev_device, const char *tag)
+{
+	struct udev_list_entry *list_entry;
+
+	if (udev_device == NULL)
+		return false;
+	if (!udev_device->info_loaded)
+		udev_device_read_db(udev_device, NULL);
+	list_entry = udev_device_get_tags_list_entry(udev_device);
+	if (udev_list_entry_get_by_name(list_entry, tag) != NULL)
+		return true;
+	return false;
+}
+
 #define ENVP_SIZE			128
 #define MONITOR_BUF_SIZE		4096
 static int update_envp_monitor_buf(struct udev_device *udev_device)
@@ -1272,7 +1713,7 @@ static int update_envp_monitor_buf(struct udev_device *udev_device)
 	}
 	udev_device->envp[i] = NULL;
 	udev_device->monitor_buf_len = s - udev_device->monitor_buf;
-	udev_device->envp_uptodate = 1;
+	udev_device->envp_uptodate = true;
 	dbg(udev_device->udev, "filled envp/monitor buffer, %u properties, %zu bytes\n",
 	    i, udev_device->monitor_buf_len);
 	return 0;
@@ -1305,122 +1746,10 @@ int udev_device_set_action(struct udev_device *udev_device, const char *action)
 	return 0;
 }
 
-int udev_device_set_driver(struct udev_device *udev_device, const char *driver)
-{
-	free(udev_device->driver);
-	udev_device->driver = strdup(driver);
-	if (udev_device->driver == NULL)
-		return -ENOMEM;
-	udev_device->driver_set = 1;
-	udev_device_add_property(udev_device, "DRIVER", udev_device->driver);
-	return 0;
-}
-
-const char *udev_device_get_devpath_old(struct udev_device *udev_device)
-{
-	return udev_device->devpath_old;
-}
-
-int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
-{
-	const char *pos;
-	size_t len;
-
-	free(udev_device->devpath_old);
-	udev_device->devpath_old = strdup(devpath_old);
-	if (udev_device->devpath_old == NULL)
-		return -ENOMEM;
-	udev_device_add_property(udev_device, "DEVPATH_OLD", udev_device->devpath_old);
-
-	pos = strrchr(udev_device->devpath_old, '/');
-	if (pos == NULL)
-		return -EINVAL;
-	udev_device->sysname_old = strdup(&pos[1]);
-	if (udev_device->sysname_old == NULL)
-		return -ENOMEM;
-
-	/* some devices have '!' in their name, change that to '/' */
-	len = 0;
-	while (udev_device->sysname_old[len] != '\0') {
-		if (udev_device->sysname_old[len] == '!')
-			udev_device->sysname_old[len] = '/';
-		len++;
-	}
-	return 0;
-}
-
-const char *udev_device_get_sysname_old(struct udev_device *udev_device)
-{
-	if (udev_device == NULL)
-		return NULL;
-	return udev_device->sysname_old;
-}
-
-const char *udev_device_get_knodename(struct udev_device *udev_device)
-{
-	return udev_device->knodename;
-}
-
-int udev_device_set_knodename(struct udev_device *udev_device, const char *knodename)
-{
-	free(udev_device->knodename);
-	udev_device->knodename = strdup(knodename);
-	if (udev_device->knodename == NULL)
-		return -ENOMEM;
-	udev_device_add_property(udev_device, "DEVNAME", udev_device->knodename);
-	return 0;
-}
-
-int udev_device_get_timeout(struct udev_device *udev_device)
-{
-	return udev_device->timeout;
-}
-
-int udev_device_set_timeout(struct udev_device *udev_device, int timeout)
-{
-	udev_device->timeout = timeout;
-	return 0;
-}
-int udev_device_get_event_timeout(struct udev_device *udev_device)
-{
-	if (!udev_device->info_loaded)
-		device_load_info(udev_device);
-	return udev_device->event_timeout;
-}
-
-int udev_device_set_event_timeout(struct udev_device *udev_device, int event_timeout)
-{
-	udev_device->event_timeout = event_timeout;
-	return 0;
-}
-
-int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
-{
-	char num[32];
-
-	udev_device->seqnum = seqnum;
-	snprintf(num, sizeof(num), "%llu", seqnum);
-	udev_device_add_property(udev_device, "SEQNUM", num);
-	return 0;
-}
-
-int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
-{
-	char num[32];
-
-	udev_device->devnum = devnum;
-
-	snprintf(num, sizeof(num), "%u", major(devnum));
-	udev_device_add_property(udev_device, "MAJOR", num);
-	snprintf(num, sizeof(num), "%u", minor(devnum));
-	udev_device_add_property(udev_device, "MINOR", num);
-	return 0;
-}
-
 int udev_device_get_devlink_priority(struct udev_device *udev_device)
 {
 	if (!udev_device->info_loaded)
-		device_load_info(udev_device);
+		udev_device_read_db(udev_device, NULL);
 	return udev_device->devlink_priority;
 }
 
@@ -1433,7 +1762,7 @@ int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
 int udev_device_get_watch_handle(struct udev_device *udev_device)
 {
 	if (!udev_device->info_loaded)
-		device_load_info(udev_device);
+		udev_device_read_db(udev_device, NULL);
 	return udev_device->watch_handle;
 }
 
@@ -1442,3 +1771,13 @@ int udev_device_set_watch_handle(struct udev_device *udev_device, int handle)
 	udev_device->watch_handle = handle;
 	return 0;
 }
+
+bool udev_device_get_db_persist(struct udev_device *udev_device)
+{
+	return udev_device->db_persist;
+}
+
+void udev_device_set_db_persist(struct udev_device *udev_device)
+{
+	udev_device->db_persist = true;
+}