Function unmount_or_warn

freebsd/kern/vfs_subr.c:4691–4704

#endif

static void
unmount_or_warn(struct mount *mp)
{
	int error;

	error = dounmount(mp, MNT_FORCE, curthread);
	if (error != 0) {
		printf("unmount of %s failed (", mp->mnt_stat.f_mntonname);
		if (error == EBUSY)
			printf("BUSY)\n");
		else
			printf("%d)\n", error);
	}
}

/*
 * Unmount all filesystems. The list is traversed in reverse order