tmp.c

#include <fcntl.h>
#include <linux/fs.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

int main(int argc, char** argv) {
  if (argc != 3) {
    fprintf(stderr, "%s <path> <num iters>\n", argv[0]);
    exit(1);
  }
  const char* path = argv[1];
  int num_iters = atoi(argv[2]);
  for (int i = 0; i < num_iters; ++i) {
    if (unlink(path) == -1 && i != 0) {
      perror("unlink");
      exit(1);
    }
    int fd;
    if ((fd = open(path, O_CREAT)) == -1) {
      perror("open");
      exit(1);
    }
    struct stat st;
    if (fstat(fd, &st) == -1) {
      perror("fstat");
      exit(1);
    }
    int gen = 0;
    if (ioctl(fd, FS_IOC_GETVERSION, &gen) == -1) {
      gen = -1;
    }
    if (close(fd) == -1) {
      perror("close");
      exit(1);
    }
    fprintf(stdout, "%d,%d\n", st.st_ino, gen);
  }
}