Adding upstream version 241.upstream/241upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 956 insertions, 0 deletions

diff --git a/src/libsystemd/sd-device/device-private.c b/src/libsystemd/sd-device/device-private.c
new file mode 100644
index 0000000..76267a1
--- /dev/null
+++ b/src/libsystemd/sd-device/device-private.c
@@ -0,0 +1,956 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <ctype.h>
+#include <net/if.h>
+#include <sys/types.h>
+
+#include "sd-device.h"
+
+#include "alloc-util.h"
+#include "device-internal.h"
+#include "device-private.h"
+#include "device-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "hashmap.h"
+#include "macro.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "refcnt.h"
+#include "set.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "strxcpyx.h"
+#include "tmpfile-util.h"
+#include "user-util.h"
+#include "util.h"
+
+int device_add_property(sd_device *device, const char *key, const char *value) {
+        int r;
+
+        assert(device);
+        assert(key);
+
+        r = device_add_property_aux(device, key, value, false);
+        if (r < 0)
+                return r;
+
+        if (key[0] != '.') {
+                r = device_add_property_aux(device, key, value, true);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+void device_set_devlink_priority(sd_device *device, int priority) {
+        assert(device);
+
+        device->devlink_priority = priority;
+}
+
+void device_set_is_initialized(sd_device *device) {
+        assert(device);
+
+        device->is_initialized = true;
+}
+
+int device_ensure_usec_initialized(sd_device *device, sd_device *device_old) {
+        usec_t when;
+
+        assert(device);
+
+        if (device_old && device_old->usec_initialized > 0)
+                when = device_old->usec_initialized;
+        else
+                when = now(CLOCK_MONOTONIC);
+
+        return device_set_usec_initialized(device, when);
+}
+
+uint64_t device_get_properties_generation(sd_device *device) {
+        assert(device);
+
+        return device->properties_generation;
+}
+
+uint64_t device_get_tags_generation(sd_device *device) {
+        assert(device);
+
+        return device->tags_generation;
+}
+
+uint64_t device_get_devlinks_generation(sd_device *device) {
+        assert(device);
+
+        return device->devlinks_generation;
+}
+
+int device_get_devnode_mode(sd_device *device, mode_t *mode) {
+        int r;
+
+        assert(device);
+
+        r = device_read_db(device);
+        if (r < 0)
+                return r;
+
+        if (device->devmode == (mode_t) -1)
+                return -ENOENT;
+
+        if (mode)
+                *mode = device->devmode;
+
+        return 0;
+}
+
+int device_get_devnode_uid(sd_device *device, uid_t *uid) {
+        int r;
+
+        assert(device);
+
+        r = device_read_db(device);
+        if (r < 0)
+                return r;
+
+        if (device->devuid == (uid_t) -1)
+                return -ENOENT;
+
+        if (uid)
+                *uid = device->devuid;
+
+        return 0;
+}
+
+static int device_set_devuid(sd_device *device, const char *uid) {
+        unsigned u;
+        int r;
+
+        assert(device);
+        assert(uid);
+
+        r = safe_atou(uid, &u);
+        if (r < 0)
+                return r;
+
+        r = device_add_property_internal(device, "DEVUID", uid);
+        if (r < 0)
+                return r;
+
+        device->devuid = u;
+
+        return 0;
+}
+
+int device_get_devnode_gid(sd_device *device, gid_t *gid) {
+        int r;
+
+        assert(device);
+
+        r = device_read_db(device);
+        if (r < 0)
+                return r;
+
+        if (device->devgid == (gid_t) -1)
+                return -ENOENT;
+
+        if (gid)
+                *gid = device->devgid;
+
+        return 0;
+}
+
+static int device_set_devgid(sd_device *device, const char *gid) {
+        unsigned g;
+        int r;
+
+        assert(device);
+        assert(gid);
+
+        r = safe_atou(gid, &g);
+        if (r < 0)
+                return r;
+
+        r = device_add_property_internal(device, "DEVGID", gid);
+        if (r < 0)
+                return r;
+
+        device->devgid = g;
+
+        return 0;
+}
+
+static int device_amend(sd_device *device, const char *key, const char *value) {
+        int r;
+
+        assert(device);
+        assert(key);
+        assert(value);
+
+        if (streq(key, "DEVPATH")) {
+                char *path;
+
+                path = strjoina("/sys", value);
+
+                /* the caller must verify or trust this data (e.g., if it comes from the kernel) */
+                r = device_set_syspath(device, path, false);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set syspath to '%s': %m", path);
+        } else if (streq(key, "SUBSYSTEM")) {
+                r = device_set_subsystem(device, value);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set subsystem to '%s': %m", value);
+        } else if (streq(key, "DEVTYPE")) {
+                r = device_set_devtype(device, value);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set devtype to '%s': %m", value);
+        } else if (streq(key, "DEVNAME")) {
+                r = device_set_devname(device, value);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set devname to '%s': %m", value);
+        } else if (streq(key, "USEC_INITIALIZED")) {
+                usec_t t;
+
+                r = safe_atou64(value, &t);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to parse timestamp '%s': %m", value);
+
+                r = device_set_usec_initialized(device, t);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set usec-initialized to '%s': %m", value);
+        } else if (streq(key, "DRIVER")) {
+                r = device_set_driver(device, value);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set driver to '%s': %m", value);
+        } else if (streq(key, "IFINDEX")) {
+                r = device_set_ifindex(device, value);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set ifindex to '%s': %m", value);
+        } else if (streq(key, "DEVMODE")) {
+                r = device_set_devmode(device, value);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set devmode to '%s': %m", value);
+        } else if (streq(key, "DEVUID")) {
+                r = device_set_devuid(device, value);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set devuid to '%s': %m", value);
+        } else if (streq(key, "DEVGID")) {
+                r = device_set_devgid(device, value);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set devgid to '%s': %m", value);
+        } else if (streq(key, "DEVLINKS")) {
+                const char *word, *state;
+                size_t l;
+
+                FOREACH_WORD(word, l, value, state) {
+                        char devlink[l + 1];
+
+                        strncpy(devlink, word, l);
+                        devlink[l] = '\0';
+
+                        r = device_add_devlink(device, devlink);
+                        if (r < 0)
+                                return log_device_debug_errno(device, r, "sd-device: Failed to add devlink '%s': %m", devlink);
+                }
+        } else if (streq(key, "TAGS")) {
+                const char *word, *state;
+                size_t l;
+
+                FOREACH_WORD_SEPARATOR(word, l, value, ":", state) {
+                        char tag[l + 1];
+
+                        (void) strncpy(tag, word, l);
+                        tag[l] = '\0';
+
+                        r = device_add_tag(device, tag);
+                        if (r < 0)
+                                return log_device_debug_errno(device, r, "sd-device: Failed to add tag '%s': %m", tag);
+                }
+        } else {
+                r = device_add_property_internal(device, key, value);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to add property '%s=%s': %m", key, value);
+        }
+
+        return 0;
+}
+
+static const char* const device_action_table[_DEVICE_ACTION_MAX] = {
+        [DEVICE_ACTION_ADD] = "add",
+        [DEVICE_ACTION_REMOVE] = "remove",
+        [DEVICE_ACTION_CHANGE] = "change",
+        [DEVICE_ACTION_MOVE] = "move",
+        [DEVICE_ACTION_ONLINE] = "online",
+        [DEVICE_ACTION_OFFLINE] = "offline",
+        [DEVICE_ACTION_BIND] = "bind",
+        [DEVICE_ACTION_UNBIND] = "unbind",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(device_action, DeviceAction);
+
+static int device_append(sd_device *device, char *key, const char **_major, const char **_minor, uint64_t *_seqnum,
+                         DeviceAction *_action) {
+        DeviceAction action = _DEVICE_ACTION_INVALID;
+        uint64_t seqnum = 0;
+        const char *major = NULL, *minor = NULL;
+        char *value;
+        int r;
+
+        assert(device);
+        assert(key);
+        assert(_major);
+        assert(_minor);
+        assert(_seqnum);
+        assert(_action);
+
+        value = strchr(key, '=');
+        if (!value) {
+                log_device_debug(device, "sd-device: Not a key-value pair: '%s'", key);
+                return -EINVAL;
+        }
+
+        *value = '\0';
+
+        value++;
+
+        if (streq(key, "MAJOR"))
+                major = value;
+        else if (streq(key, "MINOR"))
+                minor = value;
+        else {
+                if (streq(key, "ACTION")) {
+                        action = device_action_from_string(value);
+                        if (action == _DEVICE_ACTION_INVALID)
+                                return -EINVAL;
+                } else if (streq(key, "SEQNUM")) {
+                        r = safe_atou64(value, &seqnum);
+                        if (r < 0)
+                                return r;
+                        else if (seqnum == 0)
+                                 /* kernel only sends seqnum > 0 */
+                                return -EINVAL;
+                }
+
+                r = device_amend(device, key, value);
+                if (r < 0)
+                        return r;
+        }
+
+        if (major != 0)
+                *_major = major;
+
+        if (minor != 0)
+                *_minor = minor;
+
+        if (action != _DEVICE_ACTION_INVALID)
+                *_action = action;
+
+        if (seqnum > 0)
+                *_seqnum = seqnum;
+
+        return 0;
+}
+
+void device_seal(sd_device *device) {
+        assert(device);
+
+        device->sealed = true;
+}
+
+static int device_verify(sd_device *device, DeviceAction action, uint64_t seqnum) {
+        assert(device);
+
+        if (!device->devpath || !device->subsystem || action == _DEVICE_ACTION_INVALID || seqnum == 0) {
+                log_device_debug(device, "sd-device: Device created from strv or nulstr lacks devpath, subsystem, action or seqnum.");
+                return -EINVAL;
+        }
+
+        device->sealed = true;
+
+        return 0;
+}
+
+int device_new_from_strv(sd_device **ret, char **strv) {
+        _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+        char **key;
+        const char *major = NULL, *minor = NULL;
+        DeviceAction action = _DEVICE_ACTION_INVALID;
+        uint64_t seqnum = 0;
+        int r;
+
+        assert(ret);
+        assert(strv);
+
+        r = device_new_aux(&device);
+        if (r < 0)
+                return r;
+
+        STRV_FOREACH(key, strv) {
+                r = device_append(device, *key, &major, &minor, &seqnum, &action);
+                if (r < 0)
+                        return r;
+        }
+
+        if (major) {
+                r = device_set_devnum(device, major, minor);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set devnum %s:%s: %m", major, minor);
+        }
+
+        r = device_verify(device, action, seqnum);
+        if (r < 0)
+                return r;
+
+        *ret = TAKE_PTR(device);
+
+        return 0;
+}
+
+int device_new_from_nulstr(sd_device **ret, uint8_t *nulstr, size_t len) {
+        _cleanup_(sd_device_unrefp) sd_device *device = NULL;
+        const char *major = NULL, *minor = NULL;
+        DeviceAction action = _DEVICE_ACTION_INVALID;
+        uint64_t seqnum = 0;
+        unsigned i = 0;
+        int r;
+
+        assert(ret);
+        assert(nulstr);
+        assert(len);
+
+        r = device_new_aux(&device);
+        if (r < 0)
+                return r;
+
+        while (i < len) {
+                char *key;
+                const char *end;
+
+                key = (char*)&nulstr[i];
+                end = memchr(key, '\0', len - i);
+                if (!end) {
+                        log_device_debug(device, "sd-device: Failed to parse nulstr");
+                        return -EINVAL;
+                }
+                i += end - key + 1;
+
+                r = device_append(device, key, &major, &minor, &seqnum, &action);
+                if (r < 0)
+                        return r;
+        }
+
+        if (major) {
+                r = device_set_devnum(device, major, minor);
+                if (r < 0)
+                        return log_device_debug_errno(device, r, "sd-device: Failed to set devnum %s:%s: %m", major, minor);
+        }
+
+        r = device_verify(device, action, seqnum);
+        if (r < 0)
+                return r;
+
+        *ret = TAKE_PTR(device);
+
+        return 0;
+}
+
+static int device_update_properties_bufs(sd_device *device) {
+        const char *val, *prop;
+        _cleanup_free_ char **buf_strv = NULL;
+        _cleanup_free_ uint8_t *buf_nulstr = NULL;
+        size_t allocated_nulstr = 0;
+        size_t nulstr_len = 0, num = 0, i = 0;
+
+        assert(device);
+
+        if (!device->properties_buf_outdated)
+                return 0;
+
+        FOREACH_DEVICE_PROPERTY(device, prop, val) {
+                size_t len = 0;
+
+                len = strlen(prop) + 1 + strlen(val);
+
+                buf_nulstr = GREEDY_REALLOC0(buf_nulstr, allocated_nulstr, nulstr_len + len + 2);
+                if (!buf_nulstr)
+                        return -ENOMEM;
+
+                strscpyl((char *)buf_nulstr + nulstr_len, len + 1, prop, "=", val, NULL);
+                nulstr_len += len + 1;
+                ++num;
+        }
+
+        /* build buf_strv from buf_nulstr */
+        buf_strv = new0(char *, num + 1);
+        if (!buf_strv)
+                return -ENOMEM;
+
+        NULSTR_FOREACH(val, (char*) buf_nulstr) {
+                buf_strv[i] = (char *) val;
+                assert(i < num);
+                i++;
+        }
+
+        free_and_replace(device->properties_nulstr, buf_nulstr);
+        device->properties_nulstr_len = nulstr_len;
+        free_and_replace(device->properties_strv, buf_strv);
+
+        device->properties_buf_outdated = false;
+
+        return 0;
+}
+
+int device_get_properties_nulstr(sd_device *device, const uint8_t **nulstr, size_t *len) {
+        int r;
+
+        assert(device);
+        assert(nulstr);
+        assert(len);
+
+        r = device_update_properties_bufs(device);
+        if (r < 0)
+                return r;
+
+        *nulstr = device->properties_nulstr;
+        *len = device->properties_nulstr_len;
+
+        return 0;
+}
+
+int device_get_properties_strv(sd_device *device, char ***strv) {
+        int r;
+
+        assert(device);
+        assert(strv);
+
+        r = device_update_properties_bufs(device);
+        if (r < 0)
+                return r;
+
+        *strv = device->properties_strv;
+
+        return 0;
+}
+
+int device_get_devlink_priority(sd_device *device, int *priority) {
+        int r;
+
+        assert(device);
+        assert(priority);
+
+        r = device_read_db(device);
+        if (r < 0)
+                return r;
+
+        *priority = device->devlink_priority;
+
+        return 0;
+}
+
+int device_get_watch_handle(sd_device *device, int *handle) {
+        int r;
+
+        assert(device);
+
+        r = device_read_db(device);
+        if (r < 0)
+                return r;
+
+        if (device->watch_handle < 0)
+                return -ENOENT;
+
+        if (handle)
+                *handle = device->watch_handle;
+
+        return 0;
+}
+
+void device_set_watch_handle(sd_device *device, int handle) {
+        assert(device);
+
+        device->watch_handle = handle;
+}
+
+int device_rename(sd_device *device, const char *name) {
+        _cleanup_free_ char *dirname = NULL;
+        char *new_syspath;
+        const char *interface;
+        int r;
+
+        assert(device);
+        assert(name);
+
+        dirname = dirname_malloc(device->syspath);
+        if (!dirname)
+                return -ENOMEM;
+
+        new_syspath = strjoina(dirname, "/", name);
+
+        /* the user must trust that the new name is correct */
+        r = device_set_syspath(device, new_syspath, false);
+        if (r < 0)
+                return r;
+
+        r = sd_device_get_property_value(device, "INTERFACE", &interface);
+        if (r >= 0) {
+                /* like DEVPATH_OLD, INTERFACE_OLD is not saved to the db, but only stays around for the current event */
+                r = device_add_property_internal(device, "INTERFACE_OLD", interface);
+                if (r < 0)
+                        return r;
+
+                r = device_add_property_internal(device, "INTERFACE", name);
+                if (r < 0)
+                        return r;
+        } else if (r != -ENOENT)
+                return r;
+
+        return 0;
+}
+
+int device_shallow_clone(sd_device *old_device, sd_device **new_device) {
+        _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
+        int r;
+
+        assert(old_device);
+        assert(new_device);
+
+        r = device_new_aux(&ret);
+        if (r < 0)
+                return r;
+
+        r = device_set_syspath(ret, old_device->syspath, false);
+        if (r < 0)
+                return r;
+
+        r = device_set_subsystem(ret, old_device->subsystem);
+        if (r < 0)
+                return r;
+
+        ret->devnum = old_device->devnum;
+
+        *new_device = TAKE_PTR(ret);
+
+        return 0;
+}
+
+int device_clone_with_db(sd_device *old_device, sd_device **new_device) {
+        _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
+        int r;
+
+        assert(old_device);
+        assert(new_device);
+
+        r = device_shallow_clone(old_device, &ret);
+        if (r < 0)
+                return r;
+
+        r = device_read_db(ret);
+        if (r < 0)
+                return r;
+
+        ret->sealed = true;
+
+        *new_device = TAKE_PTR(ret);
+
+        return 0;
+}
+
+int device_new_from_synthetic_event(sd_device **new_device, const char *syspath, const char *action) {
+        _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
+        int r;
+
+        assert(new_device);
+        assert(syspath);
+        assert(action);
+
+        r = sd_device_new_from_syspath(&ret, syspath);
+        if (r < 0)
+                return r;
+
+        r = device_read_uevent_file(ret);
+        if (r < 0)
+                return r;
+
+        r = device_add_property_internal(ret, "ACTION", action);
+        if (r < 0)
+                return r;
+
+        *new_device = TAKE_PTR(ret);
+
+        return 0;
+}
+
+int device_new_from_stat_rdev(sd_device **ret, const struct stat *st) {
+        char type;
+
+        assert(ret);
+        assert(st);
+
+        if (S_ISBLK(st->st_mode))
+                type = 'b';
+        else if (S_ISCHR(st->st_mode))
+                type = 'c';
+        else
+                return -ENOTTY;
+
+        return sd_device_new_from_devnum(ret, type, st->st_rdev);
+}
+
+int device_copy_properties(sd_device *device_dst, sd_device *device_src) {
+        const char *property, *value;
+        Iterator i;
+        int r;
+
+        assert(device_dst);
+        assert(device_src);
+
+        r = device_properties_prepare(device_src);
+        if (r < 0)
+                return r;
+
+        ORDERED_HASHMAP_FOREACH_KEY(value, property, device_src->properties_db, i) {
+                r = device_add_property_aux(device_dst, property, value, true);
+                if (r < 0)
+                        return r;
+        }
+
+        ORDERED_HASHMAP_FOREACH_KEY(value, property, device_src->properties, i) {
+                r = device_add_property_aux(device_dst, property, value, false);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+void device_cleanup_tags(sd_device *device) {
+        assert(device);
+
+        set_free_free(device->tags);
+        device->tags = NULL;
+        device->property_tags_outdated = true;
+        device->tags_generation++;
+}
+
+void device_cleanup_devlinks(sd_device *device) {
+        assert(device);
+
+        set_free_free(device->devlinks);
+        device->devlinks = NULL;
+        device->property_devlinks_outdated = true;
+        device->devlinks_generation++;
+}
+
+void device_remove_tag(sd_device *device, const char *tag) {
+        assert(device);
+        assert(tag);
+
+        free(set_remove(device->tags, tag));
+        device->property_tags_outdated = true;
+        device->tags_generation++;
+}
+
+static int device_tag(sd_device *device, const char *tag, bool add) {
+        const char *id;
+        char *path;
+        int r;
+
+        assert(device);
+        assert(tag);
+
+        r = device_get_id_filename(device, &id);
+        if (r < 0)
+                return r;
+
+        path = strjoina("/run/udev/tags/", tag, "/", id);
+
+        if (add) {
+                r = touch_file(path, true, USEC_INFINITY, UID_INVALID, GID_INVALID, 0444);
+                if (r < 0)
+                        return r;
+        } else {
+                r = unlink(path);
+                if (r < 0 && errno != ENOENT)
+                        return -errno;
+        }
+
+        return 0;
+}
+
+int device_tag_index(sd_device *device, sd_device *device_old, bool add) {
+        const char *tag;
+        int r = 0, k;
+
+        if (add && device_old) {
+                /* delete possible left-over tags */
+                FOREACH_DEVICE_TAG(device_old, tag) {
+                        if (!sd_device_has_tag(device, tag)) {
+                                k = device_tag(device_old, tag, false);
+                                if (r >= 0 && k < 0)
+                                        r = k;
+                        }
+                }
+        }
+
+        FOREACH_DEVICE_TAG(device, tag) {
+                k = device_tag(device, tag, add);
+                if (r >= 0 && k < 0)
+                        r = k;
+        }
+
+        return r;
+}
+
+static bool device_has_info(sd_device *device) {
+        assert(device);
+
+        if (!set_isempty(device->devlinks))
+                return true;
+
+        if (device->devlink_priority != 0)
+                return true;
+
+        if (!ordered_hashmap_isempty(device->properties_db))
+                return true;
+
+        if (!set_isempty(device->tags))
+                return true;
+
+        if (device->watch_handle >= 0)
+                return true;
+
+        return false;
+}
+
+void device_set_db_persist(sd_device *device) {
+        assert(device);
+
+        device->db_persist = true;
+}
+
+int device_update_db(sd_device *device) {
+        const char *id;
+        char *path;
+        _cleanup_fclose_ FILE *f = NULL;
+        _cleanup_free_ char *path_tmp = NULL;
+        bool has_info;
+        int r;
+
+        assert(device);
+
+        has_info = device_has_info(device);
+
+        r = device_get_id_filename(device, &id);
+        if (r < 0)
+                return r;
+
+        path = strjoina("/run/udev/data/", id);
+
+        /* do not store anything for otherwise empty devices */
+        if (!has_info && major(device->devnum) == 0 && device->ifindex == 0) {
+                r = unlink(path);
+                if (r < 0 && errno != ENOENT)
+                        return -errno;
+
+                return 0;
+        }
+
+        /* write a database file */
+        r = mkdir_parents(path, 0755);
+        if (r < 0)
+                return r;
+
+        r = fopen_temporary(path, &f, &path_tmp);
+        if (r < 0)
+                return r;
+
+        /*
+         * set 'sticky' bit to indicate that we should not clean the
+         * database when we transition from initramfs to the real root
+         */
+        if (device->db_persist) {
+                r = fchmod(fileno(f), 01644);
+                if (r < 0) {
+                        r = -errno;
+                        goto fail;
+                }
+        } else {
+                r = fchmod(fileno(f), 0644);
+                if (r < 0) {
+                        r = -errno;
+                        goto fail;
+                }
+        }
+
+        if (has_info) {
+                const char *property, *value, *tag;
+                Iterator i;
+
+                if (major(device->devnum) > 0) {
+                        const char *devlink;
+
+                        FOREACH_DEVICE_DEVLINK(device, devlink)
+                                fprintf(f, "S:%s\n", devlink + STRLEN("/dev/"));
+
+                        if (device->devlink_priority != 0)
+                                fprintf(f, "L:%i\n", device->devlink_priority);
+
+                        if (device->watch_handle >= 0)
+                                fprintf(f, "W:%i\n", device->watch_handle);
+                }
+
+                if (device->usec_initialized > 0)
+                        fprintf(f, "I:"USEC_FMT"\n", device->usec_initialized);
+
+                ORDERED_HASHMAP_FOREACH_KEY(value, property, device->properties_db, i)
+                        fprintf(f, "E:%s=%s\n", property, value);
+
+                FOREACH_DEVICE_TAG(device, tag)
+                        fprintf(f, "G:%s\n", tag);
+        }
+
+        r = fflush_and_check(f);
+        if (r < 0)
+                goto fail;
+
+        r = rename(path_tmp, path);
+        if (r < 0) {
+                r = -errno;
+                goto fail;
+        }
+
+        log_device_debug(device, "sd-device: Created %s file '%s' for '%s'", has_info ? "db" : "empty",
+                         path, device->devpath);
+
+        return 0;
+
+fail:
+        (void) unlink(path);
+        (void) unlink(path_tmp);
+
+        return log_device_debug_errno(device, r, "sd-device: Failed to create %s file '%s' for '%s'", has_info ? "db" : "empty", path, device->devpath);
+}
+
+int device_delete_db(sd_device *device) {
+        const char *id;
+        char *path;
+        int r;
+
+        assert(device);
+
+        r = device_get_id_filename(device, &id);
+        if (r < 0)
+                return r;
+
+        path = strjoina("/run/udev/data/", id);
+
+        r = unlink(path);
+        if (r < 0 && errno != ENOENT)
+                return -errno;
+
+        return 0;
+}