Imported Upstream version 220

1 files changed, 334 insertions, 1391 deletions

diff --git a/src/libudev/libudev-device.c b/src/libudev/libudev-device.c
index 9863901a33..893d72c19f 100644
--- a/src/libudev/libudev-device.c
+++ b/src/libudev/libudev-device.c
@@ -2,6 +2,7 @@
   This file is part of systemd.
 
   Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
+  Copyright 2015 Tom Gundersen <teg@jklm.no>
 
   systemd is free software; you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as published by
@@ -33,10 +34,13 @@
 #include <sys/socket.h>
 #include <linux/sockios.h>
 
+#include "sd-device.h"
+#include "device-util.h"
+#include "device-private.h"
+
 #include "libudev.h"
 #include "libudev-private.h"
-
-static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode);
+#include "libudev-device-internal.h"
 
 /**
  * SECTION:libudev-device
@@ -49,59 +53,6 @@ static int udev_device_set_devnode(struct udev_device *udev_device, const char *
  */
 
 /**
- * udev_device:
- *
- * Opaque object representing one kernel sys device.
- */
-struct udev_device {
-        struct udev *udev;
-        struct udev_device *parent_device;
-        char *syspath;
-        const char *devpath;
-        char *sysname;
-        const char *sysnum;
-        char *devnode;
-        mode_t devnode_mode;
-        uid_t devnode_uid;
-        gid_t devnode_gid;
-        char *subsystem;
-        char *devtype;
-        char *driver;
-        char *action;
-        char *devpath_old;
-        char *id_filename;
-        char **envp;
-        char *monitor_buf;
-        size_t monitor_buf_len;
-        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;
-        usec_t usec_initialized;
-        int devlink_priority;
-        int refcount;
-        dev_t devnum;
-        int ifindex;
-        int watch_handle;
-        int maj, min;
-        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_seqnum:
  * @udev_device: udev device
  *
@@ -112,36 +63,27 @@ struct udev_device {
  **/
 _public_ 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];
+        const char *seqnum;
+        unsigned long long ret;
+        int r;
 
-        udev_device->seqnum = seqnum;
-        snprintf(num, sizeof(num), "%llu", seqnum);
-        udev_device_add_property(udev_device, "SEQNUM", num);
-        return 0;
-}
+        assert_return_errno(udev_device, 0, EINVAL);
 
-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;
-}
+        r = sd_device_get_property_value(udev_device->device, "SEQNUM", &seqnum);
+        if (r == -ENOENT)
+                return 0;
+        else if (r < 0) {
+                errno = -r;
+                return 0;
+        }
 
-static int udev_device_set_ifindex(struct udev_device *udev_device, int ifindex)
-{
-        char num[32];
+        r = safe_atollu(seqnum, &ret);
+        if (r < 0) {
+                errno = -r;
+                return 0;
+        }
 
-        udev_device->ifindex = ifindex;
-        snprintf(num, sizeof(num), "%d", ifindex);
-        udev_device_add_property(udev_device, "IFINDEX", num);
-        return 0;
+        return ret;
 }
 
 /**
@@ -154,45 +96,18 @@ static int udev_device_set_ifindex(struct udev_device *udev_device, int ifindex)
  **/
 _public_ 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;
-}
-
-const char *udev_device_get_devpath_old(struct udev_device *udev_device)
-{
-        return udev_device->devpath_old;
-}
+        dev_t devnum;
+        int r;
 
-static int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
-{
-        const char *pos;
+        assert_return_errno(udev_device, makedev(0, 0), EINVAL);
 
-        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);
+        r = sd_device_get_devnum(udev_device->device, &devnum);
+        if (r < 0) {
+                errno = -r;
+                return makedev(0, 0);
+        }
 
-        pos = strrchr(udev_device->devpath_old, '/');
-        if (pos == NULL)
-                return -EINVAL;
-        return 0;
+        return devnum;
 }
 
 /**
@@ -205,27 +120,18 @@ static int udev_device_set_devpath_old(struct udev_device *udev_device, const ch
  **/
 _public_ const char *udev_device_get_driver(struct udev_device *udev_device)
 {
-        char driver[UTIL_NAME_SIZE];
+        const char *driver;
+        int r;
 
-        if (udev_device == NULL)
+        assert_return_errno(udev_device, NULL, EINVAL);
+
+        r = sd_device_get_driver(udev_device->device, &driver);
+        if (r < 0) {
+                errno = -r;
                 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;
+        return driver;
 }
 
 /**
@@ -238,35 +144,18 @@ static int udev_device_set_driver(struct udev_device *udev_device, const char *d
  **/
 _public_ const char *udev_device_get_devtype(struct udev_device *udev_device)
 {
-        if (udev_device == NULL)
+        const char *devtype;
+        int r;
+
+        assert_return_errno(udev_device, NULL, EINVAL);
+
+        r = sd_device_get_devtype(udev_device->device, &devtype);
+        if (r < 0) {
+                errno = -r;
                 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;
+        return devtype;
 }
 
 /**
@@ -280,251 +169,18 @@ static int udev_device_set_subsystem(struct udev_device *udev_device, const char
  **/
 _public_ 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 (startswith(udev_device->devpath, "/module/")) {
-                        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 (startswith(udev_device->devpath, "/subsystem/") ||
-                    startswith(udev_device->devpath, "/class/") ||
-                    startswith(udev_device->devpath, "/bus/")) {
-                        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;
-}
-
-uid_t udev_device_get_devnode_uid(struct udev_device *udev_device)
-{
-        if (!udev_device->info_loaded)
-                udev_device_read_uevent_file(udev_device);
-        return udev_device->devnode_uid;
-}
-
-static int udev_device_set_devnode_uid(struct udev_device *udev_device, uid_t uid)
-{
-        char num[32];
-
-        udev_device->devnode_uid = uid;
-        snprintf(num, sizeof(num), "%u", uid);
-        udev_device_add_property(udev_device, "DEVUID", num);
-        return 0;
-}
-
-gid_t udev_device_get_devnode_gid(struct udev_device *udev_device)
-{
-        if (!udev_device->info_loaded)
-                udev_device_read_uevent_file(udev_device);
-        return udev_device->devnode_gid;
-}
-
-static int udev_device_set_devnode_gid(struct udev_device *udev_device, gid_t gid)
-{
-        char num[32];
-
-        udev_device->devnode_gid = gid;
-        snprintf(num, sizeof(num), "%u", gid);
-        udev_device_add_property(udev_device, "DEVGID", 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 = false;
-        if (value == NULL) {
-                struct udev_list_entry *list_entry;
-
-                list_entry = udev_device_get_properties_list_entry(udev_device);
-                list_entry = udev_list_entry_get_by_name(list_entry, key);
-                if (list_entry != NULL)
-                        udev_list_entry_delete(list_entry);
-                return NULL;
-        }
-        return udev_list_entry_add(&udev_device->properties_list, key, value);
-}
+        const char *subsystem;
+        int r;
 
-static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
-{
-        char name[UTIL_LINE_SIZE];
-        char *val;
+        assert_return_errno(udev_device, NULL, EINVAL);
 
-        strscpy(name, sizeof(name), property);
-        val = strchr(name, '=');
-        if (val == NULL)
+        r = sd_device_get_subsystem(udev_device->device, &subsystem);
+        if (r < 0) {
+                errno = -r;
                 return NULL;
-        val[0] = '\0';
-        val = &val[1];
-        if (val[0] == '\0')
-                val = NULL;
-        return udev_device_add_property(udev_device, name, val);
-}
-
-static int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
-{
-        const char *pos;
-        size_t len;
-
-        free(udev_device->syspath);
-        udev_device->syspath = strdup(syspath);
-        if (udev_device->syspath ==  NULL)
-                return -ENOMEM;
-        udev_device->devpath = udev_device->syspath + strlen("/sys");
-        udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath);
-
-        pos = strrchr(udev_device->syspath, '/');
-        if (pos == NULL)
-                return -EINVAL;
-        udev_device->sysname = strdup(&pos[1]);
-        if (udev_device->sysname == NULL)
-                return -ENOMEM;
-
-        /* some devices have '!' in their name, change that to '/' */
-        len = 0;
-        while (udev_device->sysname[len] != '\0') {
-                if (udev_device->sysname[len] == '!')
-                        udev_device->sysname[len] = '/';
-                len++;
         }
 
-        /* trailing number */
-        while (len > 0 && isdigit(udev_device->sysname[--len]))
-                udev_device->sysnum = &udev_device->sysname[len];
-
-        /* sysname is completely numeric */
-        if (len == 0)
-                udev_device->sysnum = NULL;
-
-        return 0;
-}
-
-/*
- * parse property string, and if needed, update internal values accordingly
- *
- * udev_device_add_property_from_string_parse_finish() needs to be
- * called after adding properties, and its return value checked
- *
- * udev_device_set_info_loaded() needs to be set, to avoid trying
- * to use a device without a DEVPATH set
- */
-void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property)
-{
-        if (startswith(property, "DEVPATH=")) {
-                char path[UTIL_PATH_SIZE];
-
-                strscpyl(path, sizeof(path), "/sys", &property[8], NULL);
-                udev_device_set_syspath(udev_device, path);
-        } else if (startswith(property, "SUBSYSTEM=")) {
-                udev_device_set_subsystem(udev_device, &property[10]);
-        } else if (startswith(property, "DEVTYPE=")) {
-                udev_device_set_devtype(udev_device, &property[8]);
-        } else if (startswith(property, "DEVNAME=")) {
-                udev_device_set_devnode(udev_device, &property[8]);
-        } else if (startswith(property, "DEVLINKS=")) {
-                char devlinks[UTIL_PATH_SIZE];
-                char *slink;
-                char *next;
-
-                strscpy(devlinks, sizeof(devlinks), &property[9]);
-                slink = devlinks;
-                next = strchr(slink, ' ');
-                while (next != NULL) {
-                        next[0] = '\0';
-                        udev_device_add_devlink(udev_device, slink);
-                        slink = &next[1];
-                        next = strchr(slink, ' ');
-                }
-                if (slink[0] != '\0')
-                        udev_device_add_devlink(udev_device, slink);
-        } else if (startswith(property, "TAGS=")) {
-                char tags[UTIL_PATH_SIZE];
-                char *next;
-
-                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 (startswith(property, "USEC_INITIALIZED=")) {
-                udev_device_set_usec_initialized(udev_device, strtoull(&property[19], NULL, 10));
-        } else if (startswith(property, "DRIVER=")) {
-                udev_device_set_driver(udev_device, &property[7]);
-        } else if (startswith(property, "ACTION=")) {
-                udev_device_set_action(udev_device, &property[7]);
-        } else if (startswith(property, "MAJOR=")) {
-                udev_device->maj = strtoull(&property[6], NULL, 10);
-        } else if (startswith(property, "MINOR=")) {
-                udev_device->min = strtoull(&property[6], NULL, 10);
-        } else if (startswith(property, "DEVPATH_OLD=")) {
-                udev_device_set_devpath_old(udev_device, &property[12]);
-        } else if (startswith(property, "SEQNUM=")) {
-                udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10));
-        } else if (startswith(property, "IFINDEX=")) {
-                udev_device_set_ifindex(udev_device, strtoull(&property[8], NULL, 10));
-        } else if (startswith(property, "DEVMODE=")) {
-                udev_device_set_devnode_mode(udev_device, strtoul(&property[8], NULL, 8));
-        } else if (startswith(property, "DEVUID=")) {
-                udev_device_set_devnode_uid(udev_device, strtoul(&property[7], NULL, 10));
-        } else if (startswith(property, "DEVGID=")) {
-                udev_device_set_devnode_gid(udev_device, strtoul(&property[7], NULL, 10));
-        } else {
-                udev_device_add_property_from_string(udev_device, property);
-        }
-}
-
-int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device)
-{
-        if (udev_device->maj > 0)
-                udev_device_set_devnum(udev_device, makedev(udev_device->maj, udev_device->min));
-        udev_device->maj = 0;
-        udev_device->min = 0;
-
-        if (udev_device->devpath == NULL || udev_device->subsystem == NULL)
-                return -EINVAL;
-        return 0;
+        return subsystem;
 }
 
 /**
@@ -538,165 +194,36 @@ int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_d
  **/
 _public_ const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
 {
-        struct udev_list_entry *list_entry;
-
-        if (udev_device == NULL)
-                return NULL;
-        if (key == NULL)
-                return NULL;
-
-        list_entry = udev_device_get_properties_list_entry(udev_device);
-        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, const char *dbfile)
-{
-        char filename[UTIL_PATH_SIZE];
-        char line[UTIL_LINE_SIZE];
-        FILE *f;
-
-        /* providing a database file will always force-load it */
-        if (dbfile == NULL) {
-                const char *id;
-
-                if (udev_device->db_loaded)
-                        return 0;
-                udev_device->db_loaded = true;
-
-                id = udev_device_get_id_filename(udev_device);
-                if (id == NULL)
-                        return -1;
-                strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL);
-                dbfile = filename;
-        }
-
-        f = fopen(dbfile, "re");
-        if (f == NULL)
-                return log_debug_errno(errno, "no db file to read %s: %m", dbfile);
-
-        /* devices with a database entry are initialized */
-        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)
-                        break;
-                line[len-1] = '\0';
-                val = &line[2];
-                switch(line[0]) {
-                case 'S':
-                        strscpyl(filename, sizeof(filename), "/dev/", val, NULL);
-                        udev_device_add_devlink(udev_device, filename);
-                        break;
-                case 'L':
-                        udev_device_set_devlink_priority(udev_device, atoi(val));
-                        break;
-                case 'E':
-                        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);
-
-        log_debug("device %p filled with db file data", udev_device);
-        return 0;
-}
-
-int udev_device_read_uevent_file(struct udev_device *udev_device)
-{
-        char filename[UTIL_PATH_SIZE];
-        FILE *f;
-        char line[UTIL_LINE_SIZE];
-        int maj = 0;
-        int min = 0;
+        const char *value = NULL;
+        int r;
 
-        if (udev_device->uevent_loaded)
-                return 0;
+        assert_return_errno(udev_device && key, NULL, EINVAL);
 
-        strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL);
-        f = fopen(filename, "re");
-        if (f == NULL)
-                return -errno;
-        udev_device->uevent_loaded = true;
-
-        while (fgets(line, sizeof(line), f)) {
-                char *pos;
-
-                pos = strchr(line, '\n');
-                if (pos == NULL)
-                        continue;
-                pos[0] = '\0';
-
-                if (startswith(line, "DEVTYPE=")) {
-                        udev_device_set_devtype(udev_device, &line[8]);
-                        continue;
-                }
-                if (startswith(line, "IFINDEX=")) {
-                        udev_device_set_ifindex(udev_device, strtoull(&line[8], NULL, 10));
-                        continue;
-                }
-                if (startswith(line, "DEVNAME=")) {
-                        udev_device_set_devnode(udev_device, &line[8]);
-                        continue;
-                }
-
-                if (startswith(line, "MAJOR="))
-                        maj = strtoull(&line[6], NULL, 10);
-                else if (startswith(line, "MINOR="))
-                        min = strtoull(&line[6], NULL, 10);
-                else if (startswith(line, "DEVMODE="))
-                        udev_device->devnode_mode = strtoul(&line[8], NULL, 8);
-
-                udev_device_add_property_from_string(udev_device, line);
+        r = sd_device_get_property_value(udev_device->device, key, &value);
+        if (r < 0) {
+                errno = -r;
+                return NULL;
         }
 
-        udev_device->devnum = makedev(maj, min);
-        fclose(f);
-        return 0;
-}
-
-void udev_device_set_info_loaded(struct udev_device *device)
-{
-        device->info_loaded = true;
+        return value;
 }
 
-static struct udev_device *udev_device_new(struct udev *udev)
-{
+struct udev_device *udev_device_new(struct udev *udev) {
         struct udev_device *udev_device;
 
-        if (udev == NULL) {
-                errno = EINVAL;
-                return NULL;
-        }
+        assert_return_errno(udev, NULL, EINVAL);
 
         udev_device = new0(struct udev_device, 1);
-        if (udev_device == NULL) {
+        if (!udev_device) {
                 errno = ENOMEM;
                 return NULL;
         }
         udev_device->refcount = 1;
         udev_device->udev = udev;
-        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->watch_handle = -1;
+        udev_list_init(udev, &udev_device->properties, true);
+        udev_list_init(udev, &udev_device->tags, true);
+        udev_list_init(udev, &udev_device->sysattrs, true);
+        udev_list_init(udev, &udev_device->devlinks, true);
 
         return udev_device;
 }
@@ -715,68 +242,21 @@ static struct udev_device *udev_device_new(struct udev *udev)
  *
  * Returns: a new udev device, or #NULL, if it does not exist
  **/
-_public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
-{
-        const char *subdir;
-        char path[UTIL_PATH_SIZE];
-        char *pos;
-        struct stat statbuf;
+_public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath) {
         struct udev_device *udev_device;
+        int r;
 
-        if (udev == NULL) {
-                errno = EINVAL;
-                return NULL;
-        }
-
-        if (syspath == NULL) {
-                errno = EINVAL;
-                return NULL;
-        }
-
-        /* path starts in sys */
-        if (!startswith(syspath, "/sys")) {
-                log_debug("not in sys :%s", syspath);
-                errno = EINVAL;
+        udev_device = udev_device_new(udev);
+        if (!udev_device)
                 return NULL;
-        }
 
-        /* path is not a root directory */
-        subdir = syspath + strlen("/sys");
-        pos = strrchr(subdir, '/');
-        if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) {
-                errno = EINVAL;
+        r = sd_device_new_from_syspath(&udev_device->device, syspath);
+        if (r < 0) {
+                errno = -r;
+                udev_device_unref(udev_device);
                 return NULL;
         }
 
-        /* resolve possible symlink to real path */
-        strscpy(path, sizeof(path), syspath);
-        util_resolve_sys_link(udev, path, sizeof(path));
-
-        if (startswith(path + strlen("/sys"), "/devices/")) {
-                char file[UTIL_PATH_SIZE];
-
-                /* all "devices" require a "uevent" file */
-                strscpyl(file, sizeof(file), path, "/uevent", NULL);
-                if (stat(file, &statbuf) != 0)
-                        return NULL;
-        } else {
-                /* everything else just needs to be a directory */
-                if (stat(path, &statbuf) != 0)
-                        return NULL;
-
-                if (!S_ISDIR(statbuf.st_mode)) {
-                        errno = EISDIR;
-                        return NULL;
-                }
-        }
-
-        udev_device = udev_device_new(udev);
-        if (udev_device == NULL)
-                return NULL;
-
-        udev_device_set_syspath(udev_device, path);
-        log_debug("device %p has devpath '%s'", udev_device, udev_device_get_devpath(udev_device));
-
         return udev_device;
 }
 
@@ -798,22 +278,21 @@ _public_ struct udev_device *udev_device_new_from_syspath(struct udev *udev, con
  **/
 _public_ 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;
-
-        if (type == 'b')
-                type_str = "block";
-        else if (type == 'c')
-                type_str = "char";
-        else {
-                errno = EINVAL;
+        struct udev_device *udev_device;
+        int r;
+
+        udev_device = udev_device_new(udev);
+        if (!udev_device)
+                return NULL;
+
+        r = sd_device_new_from_devnum(&udev_device->device, type, devnum);
+        if (r < 0) {
+                errno = -r;
+                udev_device_unref(udev_device);
                 return NULL;
         }
 
-        /* use /sys/dev/{block,char}/<maj>:<min> link */
-        snprintf(path, sizeof(path), "/sys/dev/%s/%u:%u",
-                 type_str, major(devnum), minor(devnum));
-        return udev_device_new_from_syspath(udev, path);
+        return udev_device;
 }
 
 /**
@@ -836,65 +315,21 @@ _public_ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char
  **/
 _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, const 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) {
-                        errno = EINVAL;
-                        return NULL;
-                }
-
-                sk = socket(PF_INET, SOCK_DGRAM, 0);
-                if (sk < 0)
-                        return NULL;
-                memzero(&ifr, 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;
-
-                /* this is racy, so we may end up with the wrong device */
-                udev_device_unref(dev);
-                errno = ENODEV;
+        struct udev_device *udev_device;
+        int r;
+
+        udev_device = udev_device_new(udev);
+        if (!udev_device)
                 return NULL;
-        }
-        case '+':
-                strscpy(subsys, sizeof(subsys), &id[1]);
-                sysname = strchr(subsys, ':');
-                if (sysname == NULL) {
-                        errno = EINVAL;
-                        return NULL;
-                }
-                sysname[0] = '\0';
-                sysname = &sysname[1];
-                return udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
-        default:
-                errno = EINVAL;
+
+        r = sd_device_new_from_device_id(&udev_device->device, id);
+        if (r < 0) {
+                errno = -r;
+                udev_device_unref(udev_device);
                 return NULL;
         }
+
+        return udev_device;
 }
 
 /**
@@ -914,69 +349,21 @@ _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, c
  **/
 _public_ struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
 {
-        char path[UTIL_PATH_SIZE];
-        struct stat statbuf;
-
-        if (streq(subsystem, "subsystem")) {
-                strscpyl(path, sizeof(path), "/sys/subsystem/", sysname, NULL);
-                if (stat(path, &statbuf) == 0)
-                        goto found;
-
-                strscpyl(path, sizeof(path), "/sys/bus/", sysname, NULL);
-                if (stat(path, &statbuf) == 0)
-                        goto found;
-
-                strscpyl(path, sizeof(path), "/sys/class/", sysname, NULL);
-                if (stat(path, &statbuf) == 0)
-                        goto found;
-                goto out;
-        }
-
-        if (streq(subsystem, "module")) {
-                strscpyl(path, sizeof(path), "/sys/module/", sysname, NULL);
-                if (stat(path, &statbuf) == 0)
-                        goto found;
-                goto out;
-        }
-
-        if (streq(subsystem, "drivers")) {
-                char subsys[UTIL_NAME_SIZE];
-                char *driver;
-
-                strscpy(subsys, sizeof(subsys), sysname);
-                driver = strchr(subsys, ':');
-                if (driver != NULL) {
-                        driver[0] = '\0';
-                        driver = &driver[1];
-
-                        strscpyl(path, sizeof(path), "/sys/subsystem/", subsys, "/drivers/", driver, NULL);
-                        if (stat(path, &statbuf) == 0)
-                                goto found;
+        struct udev_device *udev_device;
+        int r;
 
-                        strscpyl(path, sizeof(path), "/sys/bus/", subsys, "/drivers/", driver, NULL);
-                        if (stat(path, &statbuf) == 0)
-                                goto found;
-                } else
-                        errno = EINVAL;
+        udev_device = udev_device_new(udev);
+        if (!udev_device)
+                return NULL;
 
-                goto out;
+        r = sd_device_new_from_subsystem_sysname(&udev_device->device, subsystem, sysname);
+        if (r < 0) {
+                errno = -r;
+                udev_device_unref(udev_device);
+                return NULL;
         }
 
-        strscpyl(path, sizeof(path), "/sys/subsystem/", subsystem, "/devices/", sysname, NULL);
-        if (stat(path, &statbuf) == 0)
-                goto found;
-
-        strscpyl(path, sizeof(path), "/sys/bus/", subsystem, "/devices/", sysname, NULL);
-        if (stat(path, &statbuf) == 0)
-                goto found;
-
-        strscpyl(path, sizeof(path), "/sys/class/", subsystem, "/", sysname, NULL);
-        if (stat(path, &statbuf) == 0)
-                goto found;
-out:
-        return NULL;
-found:
-        return udev_device_new_from_syspath(udev, path);
+        return udev_device;
 }
 
 /**
@@ -995,48 +382,45 @@ found:
  **/
 _public_ struct udev_device *udev_device_new_from_environment(struct udev *udev)
 {
-        int i;
         struct udev_device *udev_device;
+        int r;
 
         udev_device = udev_device_new(udev);
-        if (udev_device == NULL)
+        if (!udev_device)
                 return NULL;
-        udev_device_set_info_loaded(udev_device);
 
-        for (i = 0; environ[i] != NULL; i++)
-                udev_device_add_property_from_string_parse(udev_device, environ[i]);
-
-        if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
-                log_debug("missing values, invalid device");
+        r = device_new_from_strv(&udev_device->device, environ);
+        if (r < 0) {
+                errno = -r;
                 udev_device_unref(udev_device);
-                udev_device = NULL;
+                return NULL;
         }
 
         return udev_device;
 }
 
-static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
+static struct udev_device *device_new_from_parent(struct udev_device *child)
 {
-        struct udev_device *udev_device_parent = NULL;
-        char path[UTIL_PATH_SIZE];
-        const char *subdir;
-
-        strscpy(path, sizeof(path), udev_device->syspath);
-        subdir = path + strlen("/sys/");
-        for (;;) {
-                char *pos;
-
-                pos = strrchr(subdir, '/');
-                if (pos == NULL || pos < &subdir[2])
-                        break;
-                pos[0] = '\0';
-                udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
-                if (udev_device_parent != NULL)
-                        return udev_device_parent;
+        struct udev_device *parent;
+        int r;
+
+        assert_return_errno(child, NULL, EINVAL);
+
+        parent = udev_device_new(child->udev);
+        if (!parent)
+                return NULL;
+
+        r = sd_device_get_parent(child->device, &parent->device);
+        if (r < 0) {
+                errno = -r;
+                udev_device_unref(parent);
+                return NULL;
         }
 
-        errno = ENOENT;
-        return NULL;
+        /* the parent is unref'ed with the child, so take a ref from libudev as well */
+        sd_device_ref(parent->device);
+
+        return parent;
 }
 
 /**
@@ -1059,15 +443,15 @@ static struct udev_device *device_new_from_parent(struct udev_device *udev_devic
  **/
 _public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
 {
-        if (udev_device == NULL) {
-                errno = EINVAL;
-                return NULL;
-        }
+        assert_return_errno(udev_device, NULL, EINVAL);
+
         if (!udev_device->parent_set) {
                 udev_device->parent_set = true;
-                udev_device->parent_device = device_new_from_parent(udev_device);
+                udev_device->parent = device_new_from_parent(udev_device);
         }
-        return udev_device->parent_device;
+
+        /* TODO: errno will differ here in case parent == NULL */
+        return udev_device->parent;
 }
 
 /**
@@ -1093,33 +477,30 @@ _public_ struct udev_device *udev_device_get_parent(struct udev_device *udev_dev
  **/
 _public_ 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;
+        sd_device *parent;
+        int r;
 
-        if (subsystem == NULL) {
-                errno = EINVAL;
+        assert_return_errno(udev_device, NULL, EINVAL);
+
+        /* this relies on the fact that finding the subdevice of a parent or the
+           parent of a subdevice commute */
+
+        /* first find the correct sd_device */
+        r = sd_device_get_parent_with_subsystem_devtype(udev_device->device, subsystem, devtype, &parent);
+        if (r < 0) {
+                errno = -r;
                 return NULL;
         }
 
-        parent = udev_device_get_parent(udev_device);
-        while (parent != NULL) {
-                const char *parent_subsystem;
-                const char *parent_devtype;
-
-                parent_subsystem = udev_device_get_subsystem(parent);
-                if (parent_subsystem != NULL && streq(parent_subsystem, subsystem)) {
-                        if (devtype == NULL)
-                                break;
-                        parent_devtype = udev_device_get_devtype(parent);
-                        if (parent_devtype != NULL && streq(parent_devtype, devtype))
-                                break;
-                }
-                parent = udev_device_get_parent(parent);
+        /* then walk the chain of udev_device parents until the correspanding
+           one is found */
+        while ((udev_device = udev_device_get_parent(udev_device))) {
+                if (udev_device->device == parent)
+                        return udev_device;
         }
 
-        if (!parent)
-                errno = ENOENT;
-
-        return parent;
+        errno = ENOENT;
+        return NULL;
 }
 
 /**
@@ -1132,8 +513,8 @@ _public_ struct udev_device *udev_device_get_parent_with_subsystem_devtype(struc
  **/
 _public_ struct udev *udev_device_get_udev(struct udev_device *udev_device)
 {
-        if (udev_device == NULL)
-                return NULL;
+        assert_return_errno(udev_device, NULL, EINVAL);
+
         return udev_device->udev;
 }
 
@@ -1147,9 +528,9 @@ _public_ struct udev *udev_device_get_udev(struct udev_device *udev_device)
  **/
 _public_ struct udev_device *udev_device_ref(struct udev_device *udev_device)
 {
-        if (udev_device == NULL)
-                return NULL;
-        udev_device->refcount++;
+        if (udev_device)
+                udev_device->refcount++;
+
         return udev_device;
 }
 
@@ -1164,30 +545,18 @@ _public_ struct udev_device *udev_device_ref(struct udev_device *udev_device)
  **/
 _public_ struct udev_device *udev_device_unref(struct udev_device *udev_device)
 {
-        if (udev_device == NULL)
-                return NULL;
-        udev_device->refcount--;
-        if (udev_device->refcount > 0)
-                return NULL;
-        if (udev_device->parent_device != NULL)
-                udev_device_unref(udev_device->parent_device);
-        free(udev_device->syspath);
-        free(udev_device->sysname);
-        free(udev_device->devnode);
-        free(udev_device->subsystem);
-        free(udev_device->devtype);
-        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->id_filename);
-        free(udev_device->envp);
-        free(udev_device->monitor_buf);
-        free(udev_device);
+        if (udev_device && (-- udev_device->refcount) == 0) {
+                sd_device_unref(udev_device->device);
+                udev_device_unref(udev_device->parent);
+
+                udev_list_cleanup(&udev_device->properties);
+                udev_list_cleanup(&udev_device->sysattrs);
+                udev_list_cleanup(&udev_device->tags);
+                udev_list_cleanup(&udev_device->devlinks);
+
+                free(udev_device);
+        }
+
         return NULL;
 }
 
@@ -1202,9 +571,18 @@ _public_ struct udev_device *udev_device_unref(struct udev_device *udev_device)
  **/
 _public_ const char *udev_device_get_devpath(struct udev_device *udev_device)
 {
-        if (udev_device == NULL)
+        const char *devpath;
+        int r;
+
+        assert_return_errno(udev_device, NULL, EINVAL);
+
+        r = sd_device_get_devpath(udev_device->device, &devpath);
+        if (r < 0) {
+                errno = -r;
                 return NULL;
-        return udev_device->devpath;
+        }
+
+        return devpath;
 }
 
 /**
@@ -1218,9 +596,18 @@ _public_ const char *udev_device_get_devpath(struct udev_device *udev_device)
  **/
 _public_ const char *udev_device_get_syspath(struct udev_device *udev_device)
 {
-        if (udev_device == NULL)
+        const char *syspath;
+        int r;
+
+        assert_return_errno(udev_device, NULL, EINVAL);
+
+        r = sd_device_get_syspath(udev_device->device, &syspath);
+        if (r < 0) {
+                errno = -r;
                 return NULL;
-        return udev_device->syspath;
+        }
+
+        return syspath;
 }
 
 /**
@@ -1233,9 +620,18 @@ _public_ const char *udev_device_get_syspath(struct udev_device *udev_device)
  **/
 _public_ const char *udev_device_get_sysname(struct udev_device *udev_device)
 {
-        if (udev_device == NULL)
+        const char *sysname;
+        int r;
+
+        assert_return_errno(udev_device, NULL, EINVAL);
+
+        r = sd_device_get_sysname(udev_device->device, &sysname);
+        if (r < 0) {
+                errno = -r;
                 return NULL;
-        return udev_device->sysname;
+        }
+
+        return sysname;
 }
 
 /**
@@ -1248,9 +644,18 @@ _public_ const char *udev_device_get_sysname(struct udev_device *udev_device)
  **/
 _public_ const char *udev_device_get_sysnum(struct udev_device *udev_device)
 {
-        if (udev_device == NULL)
+        const char *sysnum;
+        int r;
+
+        assert_return_errno(udev_device, NULL, EINVAL);
+
+        r = sd_device_get_sysnum(udev_device->device, &sysnum);
+        if (r < 0) {
+                errno = -r;
                 return NULL;
-        return udev_device->sysnum;
+        }
+
+        return sysnum;
 }
 
 /**
@@ -1264,13 +669,18 @@ _public_ const char *udev_device_get_sysnum(struct udev_device *udev_device)
  **/
 _public_ const char *udev_device_get_devnode(struct udev_device *udev_device)
 {
-        if (udev_device == NULL)
+        const char *devnode;
+        int r;
+
+        assert_return_errno(udev_device, NULL, EINVAL);
+
+        r = sd_device_get_devname(udev_device->device, &devnode);
+        if (r < 0) {
+                errno = -r;
                 return NULL;
-        if (udev_device->devnode != NULL)
-                return udev_device->devnode;
-        if (!udev_device->info_loaded)
-                udev_device_read_uevent_file(udev_device);
-        return udev_device->devnode;
+        }
+
+        return devnode;
 }
 
 /**
@@ -1288,21 +698,26 @@ _public_ const char *udev_device_get_devnode(struct udev_device *udev_device)
  **/
 _public_ 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)
-                udev_device_read_db(udev_device, NULL);
-        return udev_list_get_entry(&udev_device->devlinks_list);
-}
+        assert_return_errno(udev_device, NULL, EINVAL);
 
-void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
-{
-        udev_device->devlinks_uptodate = false;
-        udev_list_cleanup(&udev_device->devlinks_list);
+        if (device_get_devlinks_generation(udev_device->device) != udev_device->devlinks_generation ||
+            !udev_device->devlinks_read) {
+                const char *devlink;
+
+                udev_list_cleanup(&udev_device->devlinks);
+
+                FOREACH_DEVICE_DEVLINK(udev_device->device, devlink)
+                        udev_list_entry_add(&udev_device->devlinks, devlink, NULL);
+
+                udev_device->devlinks_read = true;
+                udev_device->devlinks_generation = device_get_devlinks_generation(udev_device->device);
+        }
+
+        return udev_list_get_entry(&udev_device->devlinks);
 }
 
 /**
- * udev_device_get_properties_list_entry:
+ * udev_device_get_event_properties_entry:
  * @udev_device: udev device
  *
  * Retrieve the list of key/value device properties of the udev
@@ -1315,45 +730,22 @@ void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
  **/
 _public_ 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) {
-                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 = true;
-                list_entry = udev_device_get_devlinks_list_entry(udev_device);
-                if (list_entry != NULL) {
-                        char *s;
-                        size_t l;
-
-                        s = symlinks;
-                        l = strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL);
-                        udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
-                                l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL);
-                        udev_device_add_property(udev_device, "DEVLINKS", symlinks);
-                }
-        }
-        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;
-
-                        s = tags;
-                        l = strpcpyl(&s, sizeof(tags), ":", NULL);
-                        udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
-                                l = strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL);
-                        udev_device_add_property(udev_device, "TAGS", tags);
-                }
+        assert_return_errno(udev_device, NULL, EINVAL);
+
+        if (device_get_properties_generation(udev_device->device) != udev_device->properties_generation ||
+            !udev_device->properties_read) {
+                const char *key, *value;
+
+                udev_list_cleanup(&udev_device->properties);
+
+                FOREACH_DEVICE_PROPERTY(udev_device->device, key, value)
+                        udev_list_entry_add(&udev_device->properties, key, value);
+
+                udev_device->properties_read = true;
+                udev_device->properties_generation = device_get_properties_generation(udev_device->device);
         }
-        return udev_list_get_entry(&udev_device->properties_list);
+
+        return udev_list_get_entry(&udev_device->properties);
 }
 
 /**
@@ -1366,11 +758,19 @@ _public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct ud
  *
  * Returns: the kernel action value, or #NULL if there is no action value available.
  **/
-_public_ const char *udev_device_get_action(struct udev_device *udev_device)
-{
-        if (udev_device == NULL)
+_public_ const char *udev_device_get_action(struct udev_device *udev_device) {
+        const char *action = NULL;
+        int r;
+
+        assert_return_errno(udev_device, NULL, EINVAL);
+
+        r = sd_device_get_property_value(udev_device->device, "ACTION", &action);
+        if (r < 0 && r != -ENOENT) {
+                errno = -r;
                 return NULL;
-        return udev_device->action;
+        }
+
+        return action;
 }
 
 /**
@@ -1387,32 +787,18 @@ _public_ const char *udev_device_get_action(struct udev_device *udev_device)
  **/
 _public_ unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device)
 {
-        usec_t now_ts;
-
-        if (udev_device == NULL)
-                return 0;
-        if (!udev_device->info_loaded)
-                udev_device_read_db(udev_device, NULL);
-        if (udev_device->usec_initialized == 0)
-                return 0;
-        now_ts = now(CLOCK_MONOTONIC);
-        if (now_ts == 0)
-                return 0;
-        return now_ts - udev_device->usec_initialized;
-}
+        usec_t ts;
+        int r;
 
-usec_t udev_device_get_usec_initialized(struct udev_device *udev_device)
-{
-        return udev_device->usec_initialized;
-}
+        assert_return(udev_device, -EINVAL);
 
-void udev_device_set_usec_initialized(struct udev_device *udev_device, usec_t usec_initialized)
-{
-        char num[32];
+        r = sd_device_get_usec_since_initialized(udev_device->device, &ts);
+        if (r < 0) {
+                errno = EINVAL;
+                return 0;
+        }
 
-        udev_device->usec_initialized = usec_initialized;
-        snprintf(num, sizeof(num), USEC_FMT, usec_initialized);
-        udev_device_add_property(udev_device, "USEC_INITIALIZED", num);
+        return ts;
 }
 
 /**
@@ -1427,76 +813,18 @@ void udev_device_set_usec_initialized(struct udev_device *udev_device, usec_t us
  **/
 _public_ 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];
-        char value[4096];
-        struct stat statbuf;
-        int fd;
-        ssize_t size;
-        const char *val = NULL;
-
-        if (udev_device == NULL)
-                return NULL;
-        if (sysattr == NULL)
-                return NULL;
-
-        /* look for possibly already cached result */
-        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)
-                return udev_list_entry_get_value(list_entry);
+        const char *value;
+        int r;
 
-        strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL);
-        if (lstat(path, &statbuf) != 0) {
-                udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, NULL);
-                goto out;
-        }
+        assert_return_errno(udev_device, NULL, EINVAL);
 
-        if (S_ISLNK(statbuf.st_mode)) {
-                /*
-                 * Some core links return only the last element of the target path,
-                 * these are just values, the paths should not be exposed.
-                 */
-                if (streq(sysattr, "driver") ||
-                    streq(sysattr, "subsystem") ||
-                    streq(sysattr, "module")) {
-                        if (util_get_sys_core_link_value(udev_device->udev, sysattr,
-                                                         udev_device->syspath, value, sizeof(value)) < 0)
-                                return NULL;
-                        list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
-                        val = udev_list_entry_get_value(list_entry);
-                        goto out;
-                }
-
-                goto out;
+        r = sd_device_get_sysattr_value(udev_device->device, sysattr, &value);
+        if (r < 0) {
+                errno = -r;
+                return NULL;
         }
 
-        /* skip directories */
-        if (S_ISDIR(statbuf.st_mode))
-                goto out;
-
-        /* skip non-readable files */
-        if ((statbuf.st_mode & S_IRUSR) == 0)
-                goto out;
-
-        /* read attribute value */
-        fd = open(path, O_RDONLY|O_CLOEXEC);
-        if (fd < 0)
-                goto out;
-        size = read(fd, value, sizeof(value));
-        close(fd);
-        if (size < 0)
-                goto out;
-        if (size == sizeof(value))
-                goto out;
-
-        /* got a valid value, store it in cache and return it */
-        value[size] = '\0';
-        util_remove_trailing_chars(value, '\n');
-        list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
-        val = udev_list_entry_get_value(list_entry);
-out:
-        return val;
+        return value;
 }
 
 /**
@@ -1511,116 +839,15 @@ out:
  **/
 _public_ int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, char *value)
 {
-        struct udev_device *dev;
-        char path[UTIL_PATH_SIZE];
-        struct stat statbuf;
-        int fd;
-        ssize_t size, value_len;
-        int ret = 0;
-
-        if (udev_device == NULL)
-                return -EINVAL;
-        dev = udev_device;
-        if (sysattr == NULL)
-                return -EINVAL;
-        if (value == NULL)
-                value_len = 0;
-        else
-                value_len = strlen(value);
-
-        strscpyl(path, sizeof(path), udev_device_get_syspath(dev), "/", sysattr, NULL);
-        if (lstat(path, &statbuf) != 0) {
-                udev_list_entry_add(&dev->sysattr_value_list, sysattr, NULL);
-                ret = -ENXIO;
-                goto out;
-        }
-
-        if (S_ISLNK(statbuf.st_mode)) {
-                ret = -EINVAL;
-                goto out;
-        }
-
-        /* skip directories */
-        if (S_ISDIR(statbuf.st_mode)) {
-                ret = -EISDIR;
-                goto out;
-        }
-
-        /* skip non-readable files */
-        if ((statbuf.st_mode & S_IRUSR) == 0) {
-                ret = -EACCES;
-                goto out;
-        }
-
-        /* Value is limited to 4k */
-        if (value_len > 4096) {
-                ret = -EINVAL;
-                goto out;
-        }
-        util_remove_trailing_chars(value, '\n');
-
-        /* write attribute value */
-        fd = open(path, O_WRONLY|O_CLOEXEC);
-        if (fd < 0) {
-                ret = -errno;
-                goto out;
-        }
-        size = write(fd, value, value_len);
-        close(fd);
-        if (size < 0) {
-                ret = -errno;
-                goto out;
-        }
-        if (size < value_len) {
-                ret = -EIO;
-                goto out;
-        }
-
-        /* wrote a valid value, store it in cache and return it */
-        udev_list_entry_add(&dev->sysattr_value_list, sysattr, value);
-out:
-        if (dev != udev_device)
-                udev_device_unref(dev);
-        return ret;
-}
-
-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 -EINVAL;
-        if (udev_device->sysattr_list_read)
-                return 0;
-
-        dir = opendir(udev_device_get_syspath(udev_device));
-        if (!dir)
-                return -errno;
-
-        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;
-
-                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;
+        int r;
 
-                udev_list_entry_add(&udev_device->sysattr_list, dent->d_name, NULL);
-                num++;
-        }
+        assert_return(udev_device, -EINVAL);
 
-        closedir(dir);
-        udev_device->sysattr_list_read = true;
+        r = sd_device_set_sysattr_value(udev_device->device, sysattr, value);
+        if (r < 0)
+                return r;
 
-        return num;
+        return 0;
 }
 
 /**
@@ -1635,74 +862,20 @@ static int udev_device_sysattr_list_read(struct udev_device *udev_device)
  **/
 _public_ 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;
-        }
+        assert_return_errno(udev_device, NULL, EINVAL);
 
-        return udev_list_get_entry(&udev_device->sysattr_list);
-}
+        if (!udev_device->sysattrs_read) {
+                const char *sysattr;
 
-static int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
-{
-        free(udev_device->devnode);
-        if (devnode[0] != '/') {
-                if (asprintf(&udev_device->devnode, "/dev/%s", devnode) < 0)
-                        udev_device->devnode = NULL;
-        } else {
-                udev_device->devnode = strdup(devnode);
-        }
-        if (udev_device->devnode == NULL)
-                return -ENOMEM;
-        udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
-        return 0;
-}
+                udev_list_cleanup(&udev_device->sysattrs);
 
-int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink)
-{
-        struct udev_list_entry *list_entry;
-
-        udev_device->devlinks_uptodate = false;
-        list_entry = udev_list_entry_add(&udev_device->devlinks_list, devlink, NULL);
-        if (list_entry == NULL)
-                return -ENOMEM;
-        return 0;
-}
+                FOREACH_DEVICE_SYSATTR(udev_device->device, sysattr)
+                        udev_list_entry_add(&udev_device->properties, sysattr, NULL);
 
-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",
-                                     streq(udev_device_get_subsystem(udev_device), "block") ? '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%i", 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;
-                }
+                udev_device->sysattrs_read = true;
         }
-        return udev_device->id_filename;
+
+        return udev_list_get_entry(&udev_device->sysattrs);
 }
 
 /**
@@ -1720,49 +893,18 @@ const char *udev_device_get_id_filename(struct udev_device *udev_device)
  **/
 _public_ 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;
-}
+        int r, initialized;
 
-void udev_device_set_is_initialized(struct udev_device *udev_device)
-{
-        udev_device->is_initialized = true;
-}
+        assert_return(udev_device, -EINVAL);
 
-static bool is_valid_tag(const char *tag)
-{
-        return !strchr(tag, ':') && !strchr(tag, ' ');
-}
+        r = sd_device_get_is_initialized(udev_device->device, &initialized);
+        if (r < 0) {
+                errno = -r;
 
-int udev_device_add_tag(struct udev_device *udev_device, const char *tag)
-{
-        if (!is_valid_tag(tag))
-                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_remove_tag(struct udev_device *udev_device, const char *tag)
-{
-        struct udev_list_entry *e;
-
-        if (!is_valid_tag(tag))
-                return;
-        e = udev_list_get_entry(&udev_device->tags_list);
-        e = udev_list_entry_get_by_name(e, tag);
-        if (e) {
-                udev_device->tags_uptodate = false;
-                udev_list_entry_delete(e);
         }
-}
 
-void udev_device_cleanup_tags_list(struct udev_device *udev_device)
-{
-        udev_device->tags_uptodate = false;
-        udev_list_cleanup(&udev_device->tags_list);
+        return initialized;
 }
 
 /**
@@ -1778,11 +920,22 @@ void udev_device_cleanup_tags_list(struct udev_device *udev_device)
  **/
 _public_ 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);
+        assert_return_errno(udev_device, NULL, EINVAL);
+
+        if (device_get_tags_generation(udev_device->device) != udev_device->tags_generation ||
+            !udev_device->tags_read) {
+                const char *tag;
+
+                udev_list_cleanup(&udev_device->tags);
+
+                FOREACH_DEVICE_TAG(udev_device->device, tag)
+                        udev_list_entry_add(&udev_device->tags, tag, NULL);
+
+                udev_device->tags_read = true;
+                udev_device->tags_generation = device_get_tags_generation(udev_device->device);
+        }
+
+        return udev_list_get_entry(&udev_device->tags);
 }
 
 /**
@@ -1796,217 +949,7 @@ _public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_dev
  **/
 _public_ 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)
-{
-        struct udev_list_entry *list_entry;
-        char *s;
-        size_t l;
-        unsigned int i;
-
-        /* monitor buffer of property strings */
-        free(udev_device->monitor_buf);
-        udev_device->monitor_buf_len = 0;
-        udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE);
-        if (udev_device->monitor_buf == NULL)
-                return -ENOMEM;
-
-        /* envp array, strings will point into monitor buffer */
-        if (udev_device->envp == NULL)
-                udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE);
-        if (udev_device->envp == NULL)
-                return -ENOMEM;
-
-        i = 0;
-        s = udev_device->monitor_buf;
-        l = MONITOR_BUF_SIZE;
-        udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
-                const char *key;
-
-                key = udev_list_entry_get_name(list_entry);
-                /* skip private variables */
-                if (key[0] == '.')
-                        continue;
-
-                /* add string to envp array */
-                udev_device->envp[i++] = s;
-                if (i+1 >= ENVP_SIZE)
-                        return -EINVAL;
-
-                /* add property string to monitor buffer */
-                l = strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL);
-                if (l == 0)
-                        return -EINVAL;
-                /* advance past the trailing '\0' that strpcpyl() guarantees */
-                s++;
-                l--;
-        }
-        udev_device->envp[i] = NULL;
-        udev_device->monitor_buf_len = s - udev_device->monitor_buf;
-        udev_device->envp_uptodate = true;
-        return 0;
-}
-
-char **udev_device_get_properties_envp(struct udev_device *udev_device)
-{
-        if (!udev_device->envp_uptodate)
-                if (update_envp_monitor_buf(udev_device) != 0)
-                        return NULL;
-        return udev_device->envp;
-}
-
-ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf)
-{
-        if (!udev_device->envp_uptodate)
-                if (update_envp_monitor_buf(udev_device) != 0)
-                        return -EINVAL;
-        *buf = udev_device->monitor_buf;
-        return udev_device->monitor_buf_len;
-}
-
-int udev_device_set_action(struct udev_device *udev_device, const char *action)
-{
-        free(udev_device->action);
-        udev_device->action = strdup(action);
-        if (udev_device->action == NULL)
-                return -ENOMEM;
-        udev_device_add_property(udev_device, "ACTION", udev_device->action);
-        return 0;
-}
-
-int udev_device_get_devlink_priority(struct udev_device *udev_device)
-{
-        if (!udev_device->info_loaded)
-                udev_device_read_db(udev_device, NULL);
-        return udev_device->devlink_priority;
-}
-
-int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
-{
-         udev_device->devlink_priority = prio;
-        return 0;
-}
-
-int udev_device_get_watch_handle(struct udev_device *udev_device)
-{
-        if (!udev_device->info_loaded)
-                udev_device_read_db(udev_device, NULL);
-        return udev_device->watch_handle;
-}
-
-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;
-}
-
-int udev_device_rename(struct udev_device *udev_device, const char *name)
-{
-        _cleanup_free_ char *dirname = NULL;
-        char *new_syspath;
-        int r;
-
-        if (udev_device == NULL || name == NULL)
-                return -EINVAL;
-
-        dirname = dirname_malloc(udev_device->syspath);
-        if (!dirname)
-                return -ENOMEM;
-
-        new_syspath = strjoina(dirname, "/", name);
-
-        r = udev_device_set_syspath(udev_device, new_syspath);
-        if (r < 0)
-                return r;
-
-        return 0;
-}
-
-struct udev_device *udev_device_shallow_clone(struct udev_device *old_device)
-{
-        struct udev_device *device;
-
-        if (old_device == NULL)
-                return NULL;
-
-        device = udev_device_new(old_device->udev);
-        if (!device) {
-                errno = ENOMEM;
-
-                return NULL;
-        }
-
-        udev_device_set_syspath(device, udev_device_get_syspath(old_device));
-        udev_device_set_subsystem(device, udev_device_get_subsystem(old_device));
-        udev_device_set_devnum(device, udev_device_get_devnum(old_device));
-
-        return device;
-}
-
-struct udev_device *udev_device_new_from_nulstr(struct udev *udev, char *nulstr, ssize_t buflen) {
-        struct udev_device *device;
-        ssize_t bufpos = 0;
-
-        if (nulstr == NULL || buflen <= 0) {
-                errno = EINVAL;
-
-                return NULL;
-        }
-
-        device = udev_device_new(udev);
-        if (!device) {
-                errno = ENOMEM;
-
-                return NULL;
-        }
-
-        udev_device_set_info_loaded(device);
-
-        while (bufpos < buflen) {
-                char *key;
-                size_t keylen;
-
-                key = nulstr + bufpos;
-                keylen = strlen(key);
-                if (keylen == 0)
-                        break;
-
-                bufpos += keylen + 1;
-                udev_device_add_property_from_string_parse(device, key);
-        }
-
-        if (udev_device_add_property_from_string_parse_finish(device) < 0) {
-                log_debug("missing values, invalid device");
-
-                udev_device_unref(device);
-
-                errno = EINVAL;
-
-                return NULL;
-        }
+        assert_return(udev_device, 0);
 
-        return device;
+        return sd_device_has_tag(udev_device->device, tag);
 }