| #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; |
| } |