#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>

#define BLKSSZGET 	_IO(0x12,104)
#define BLKIOMIN	_IO(0x12,120)
#define BLKIOOPT	_IO(0x12,121)
#define BLKALIGNOFF	_IO(0x12,122)
#define BLKPBSZGET	_IO(0x12,123)

static int die(const char *fmt, ...)
{
        int err = errno;
        va_list val;

        va_start(val, fmt);
        vfprintf(stderr, fmt, val);
        if (err != 0)
                fprintf(stderr, ": %s", strerror(err));
        fprintf(stderr, "\n");
        va_end(val);

        exit(EXIT_FAILURE);
}

int main(int argc, char *argv[])
{
	unsigned int lbs, pbs, min, opt, align;

	int fd;

	if (argc != 2)
		die("Usage: %s <dev>", argv[0]);

	fd = open(argv[1], O_RDONLY);
	if (fd < 0)
		die("Can't open %s", argv[1]);

	if (ioctl(fd, BLKSSZGET, &lbs) < 0)
		die("Can't get logical block size");

	if (ioctl(fd, BLKPBSZGET, &pbs) < 0)
		die("Can't get physical block size");

	if (ioctl(fd, BLKIOMIN, &min) < 0)
		die("Can't get preferred random I/O size");

	if (ioctl(fd, BLKIOOPT, &opt) < 0)
		die("Can't get preferred sustained I/O size");

	if (ioctl(fd, BLKALIGNOFF, &align) < 0)
		die("Can't get alignment offset");

	printf("%s:\n", argv[1]);
	printf("\tlogical block size: %u\n", lbs);
	printf("\tphysical block size: %u\n", pbs);
	printf("\trandom I/O size: %u\n", min);
	printf("\tsustained I/O size: %u\n", opt);
	printf("\talignment offset: %u\n", align);

	exit(EXIT_SUCCESS);
}