return -1;
}
maj = gnu_dev_major(statbuf.st_rdev);
maj = major(statbuf.st_rdev);
min = gnu_dev_minor(statbuf.st_rdev);
min = minor(statbuf.st_rdev);
rc = sysfs_readlink(&linkbuf, "/sys/dev/block/%u:%u", maj, min);
if (rc < 0)