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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2004 Silicon Graphics, Inc.
* All Rights Reserved.
*/
/*
* 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 <stdint.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#ifndef BLKGETSIZE64
# define BLKGETSIZE64 _IOR(0x12,114,size_t)
#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;
}
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