mountctl_scan
mountctl_scan(mountctl_list, keyword, mountpt, fd);
ch = mountctl_scan(mountctl_restart, keyword, mountpt, fd);
ch = mountctl_scan(mountctl_delete, keyword, mountpt, -1);
ch = mountctl_scan(mountctl_modify, keyword, mountpt, fd);
calls += mountctl_scan(func, keyword, sfs[i].f_mntonname, fd);
static int mountctl_scan(void (*func)(const char *, const char *, int, void *),