func: static int create_fixed_disk(int fd, uint8_t *buf, int64_t total_size)
  
  {
  
      int ret = -EIO;
  
  
  
      /* Add footer to total size */
  
      total_size += 512;
  
      if (ftruncate(fd, total_size) != 0) {
  
          ret = -errno;
  
          goto fail;
  
      }
  
      if (lseek(fd, -512, SEEK_END) < 0) {
  
          goto fail;
  
      }
  
      if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
  
          goto fail;
  
      }
  
  
  
      ret = 0;
  
  
  
   fail:
  
      return ret;
  
  }
  