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Add a test program which just dumps out device size as mkfs would see it.  Makes finger-pointing at buggy drivers easier.

/*
 * Copyright (c) 2004 Silicon Graphics, Inc.  All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 * 
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 * 
 * http://www.sgi.com 
 * 
 * For further information regarding this notice, see: 
 * 
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

/*
 * Test program that uses the same interfaces as mkfs.xfs for
 * Linux, dumps out just the device size values from a driver.
 */

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mount.h>

#ifndef BLKGETSIZE64
# define BLKGETSIZE64   _IOR(0x12,114,size_t)
#endif
#ifndef BLKSSZGET
# define BLKSSZGET	_IO(0x12,104)
#endif

int main(int argc, char **argv)
{
	__uint64_t	size;
	long long	sz = -1;
	int		error, fd;

	if (argc != 2) {
		fputs("insufficient arguments\n", stderr);
		return 1;
	}
	fd = open(argv[1], O_RDONLY);
	if (!fd) {
		perror(argv[1]);
		return 1;
	}

	error = ioctl(fd, BLKGETSIZE64, &size);
	if (error >= 0) {
		/* BLKGETSIZE64 returns size in bytes not 512-byte blocks */
		sz = (long long)(size >> 9);
		printf("%lld 512 byte blocks (BLKGETSIZE64)\n", sz);
	} else {
		/* If BLKGETSIZE64 fails, try BLKGETSIZE */
		unsigned long tmpsize;

		error = ioctl(fd, BLKGETSIZE, &tmpsize);
		if (error < 0) {
			fprintf(stderr, "can't determine device size");
			return 1;
		}
		sz = (long long)tmpsize;
		printf("%lld 512 byte blocks (BLKGETSIZE)\n", sz);
	}
	return 0;
}