util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/tags/", tag, "/", id, NULL);
if (add) {
+ int fd;
+
util_create_path(udev, filename);
- symlink(udev_device_get_devpath(dev), filename);
+ fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
+ if (fd >= 0)
+ close(fd);
} else {
unlink(filename);
}
return 0;
}
+static bool device_has_info(struct udev_device *udev_device)
+{
+ struct udev_list_entry *list_entry;
+
+ if (udev_device_get_devlinks_list_entry(udev_device) != NULL)
+ return true;
+ if (udev_device_get_devlink_priority(udev_device) != 0)
+ return true;
+ udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device))
+ if (udev_list_entry_get_flags(list_entry))
+ return true;
+ if (udev_device_get_tags_list_entry(udev_device) != NULL)
+ return true;
+ if (udev_device_get_knodename(udev_device) != NULL)
+ if (strcmp(udev_device_get_devnode(udev_device), udev_device_get_knodename(udev_device)) != 0)
+ return true;
+ if (udev_device_get_watch_handle(udev_device) >= 0)
+ return true;
+ return false;
+}
+
int udev_device_update_db(struct udev_device *udev_device)
{
+ bool has_info;
const char *id;
struct udev *udev = udev_device_get_udev(udev_device);
char filename[UTIL_PATH_SIZE];
char filename_tmp[UTIL_PATH_SIZE];
FILE *f;
- char target[232]; /* on 64bit, tmpfs inlines up to 239 bytes */
- size_t devlen = strlen(udev_get_dev_path(udev))+1;
- char *s;
- size_t l;
- struct udev_list_entry *list_entry;
- int ret;
id = udev_device_get_id_filename(udev_device);
if (id == NULL)
return -1;
+
+ has_info = device_has_info(udev_device);
util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db/", id, NULL);
- util_strscpyl(filename_tmp, sizeof(filename_tmp), filename, ".tmp", NULL);
- udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device))
- if (udev_list_entry_get_flags(list_entry))
- goto file;
- if (udev_device_get_tags_list_entry(udev_device) != NULL)
- goto file;
- if (udev_device_get_devlink_priority(udev_device) != 0)
- goto file;
- if (udev_device_get_event_timeout(udev_device) >= 0)
- goto file;
- if (udev_device_get_watch_handle(udev_device) >= 0)
- goto file;
- if (udev_device_get_devnode(udev_device) == NULL)
- goto out;
-
- /*
- * if we have only the node and symlinks to store, try not to waste
- * tmpfs memory -- store values, if they fit, in a symlink target
- */
- s = target;
- l = util_strpcpy(&s, sizeof(target), &udev_device_get_devnode(udev_device)[devlen]);
- udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) {
- l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
- if (l == 0) {
- info(udev, "size of links too large, create file\n");
- goto file;
- }
+ /* do not store anything for otherwise empty devices */
+ if (!has_info &&
+ major(udev_device_get_devnum(udev_device)) == 0 &&
+ udev_device_get_ifindex(udev_device) == 0) {
+ unlink(filename);
+ return 0;
}
- udev_selinux_setfscreatecon(udev, filename_tmp, S_IFLNK);
- util_create_path(udev, filename_tmp);
- ret = symlink(target, filename_tmp);
- udev_selinux_resetfscreatecon(udev);
- if (ret != 0)
- goto file;
- ret = rename(filename_tmp, filename);
- if (ret != 0)
- goto file;
- info(udev, "created db link (%s)\n", target);
- goto out;
-file:
+
+ /* write a database file */
+ util_strscpyl(filename_tmp, sizeof(filename_tmp), filename, ".tmp", NULL);
util_create_path(udev, filename_tmp);
- f = fopen(filename_tmp, "w");
+ f = fopen(filename_tmp, "we");
if (f == NULL) {
err(udev, "unable to create temporary db file '%s': %m\n", filename_tmp);
return -1;
}
- if (udev_device_get_devnode(udev_device) != NULL) {
- fprintf(f, "N:%s\n", &udev_device_get_devnode(udev_device)[devlen]);
- udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device))
- fprintf(f, "S:%s\n", &udev_list_entry_get_name(list_entry)[devlen]);
- }
- if (udev_device_get_devlink_priority(udev_device) != 0)
- fprintf(f, "L:%i\n", udev_device_get_devlink_priority(udev_device));
- if (udev_device_get_event_timeout(udev_device) >= 0)
- fprintf(f, "T:%i\n", udev_device_get_event_timeout(udev_device));
- if (udev_device_get_watch_handle(udev_device) >= 0)
- fprintf(f, "W:%i\n", udev_device_get_watch_handle(udev_device));
- udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
- if (!udev_list_entry_get_flags(list_entry))
- continue;
- fprintf(f, "E:%s=%s\n",
- udev_list_entry_get_name(list_entry),
- udev_list_entry_get_value(list_entry));
+ if (has_info) {
+ size_t devlen = strlen(udev_get_dev_path(udev))+1;
+ struct udev_list_entry *list_entry;
+
+ if (udev_device_get_devnode(udev_device) != NULL) {
+ fprintf(f, "N:%s\n", &udev_device_get_devnode(udev_device)[devlen]);
+ udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device))
+ fprintf(f, "S:%s\n", &udev_list_entry_get_name(list_entry)[devlen]);
+ }
+ if (udev_device_get_devlink_priority(udev_device) != 0)
+ fprintf(f, "L:%i\n", udev_device_get_devlink_priority(udev_device));
+ if (udev_device_get_watch_handle(udev_device) >= 0)
+ fprintf(f, "W:%i\n", udev_device_get_watch_handle(udev_device));
+ udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
+ if (!udev_list_entry_get_flags(list_entry))
+ continue;
+ fprintf(f, "E:%s=%s\n",
+ udev_list_entry_get_name(list_entry),
+ udev_list_entry_get_value(list_entry));
+ }
+ udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
+ fprintf(f, "G:%s\n", udev_list_entry_get_name(list_entry));
}
- udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
- fprintf(f, "G:%s\n", udev_list_entry_get_name(list_entry));
+
fclose(f);
rename(filename_tmp, filename);
- info(udev, "created db file for '%s' in '%s'\n", udev_device_get_devpath(udev_device), filename);
-out:
+ info(udev, "created %s file '%s' for '%s'\n", has_info ? "db" : "empty",
+ filename, udev_device_get_devpath(udev_device));
return 0;
}
~ianmdlvl / elogind.git / blobdiff