vol_getmntdev
if (vol_getmntdev(fp, &mnt, sb.st_rdev, &info) != 0) {
static int vol_getmntdev(FILE *, struct mnttab *, dev_t,
if (vol_getmntdev(fp, &mnt, sb.st_rdev, &info) != 0) {
static int vol_getmntdev(FILE *, struct mnttab *, dev_t,