+static int find_root_dev(char *buf, int len)
+{
+ DIR *d;
+ dev_t root;
+ struct stat s;
+ struct dirent *e;
+
+ if (stat("/", &s))
+ return -1;
+
+ if (!(d = opendir("/dev")))
+ return -1;
+
+ root = s.st_dev;
+
+ while ((e = readdir(d)) != NULL) {
+ snprintf(buf, len, "/dev/%s", e->d_name);
+
+ if (stat(buf, &s) || s.st_rdev != root)
+ continue;
+
+ closedir(d);
+ return 0;
+ }
+
+ closedir(d);
+ return -1;
+}
+