#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <linux/hdreg.h>
#include <assert.h>
#include <string.h>
#include <errno.h>

int main(int argc, char **argv) {
  int fd, i, block, blocksize, bcount;
  struct stat st;

  assert(argv[1] != NULL);

  assert(fd=open(argv[1], O_RDONLY));

  assert(ioctl(fd, FIGETBSZ, &blocksize) == 0);

  assert(!fstat(fd, &st));

  bcount = (st.st_size + blocksize - 1) / blocksize;

  printf("File: %s Size: %d Blocks: %d Blocksize: %d\n", 
    argv[1], st.st_size, bcount, blocksize);

  for(i=0;i < bcount;i++) {
    block=i;
    if (ioctl(fd, FIBMAP, &block)) {
      printf("FIBMAP ioctl failed - errno: %s\n",
        strerror(errno));
    }
    printf("%d\t%d\n", i, block);
  }

  close(fd);
}