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#define _GNU_SOURCE
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
int fd = open(argv[1], O_RDWR | O_DIRECT);
int ret;
unsigned long long range[2];
if (argc != 4) {
fprintf(stderr, "usage: %s <device> <start> <length>\n",
argv[0]);
}
if (fd < 0) {
perror("open");
return errno;
}
range[0] = atoll(argv[2]);
range[1] = atoll(argv[3]);
printf("erasing %lld to %lld on %s\n", range[0], range[0] + range[1], argv[1]);
ret = ioctl(fd, BLKDISCARD, range);
if (ret)
perror("ioctl");
return errno;
}
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