text: /**
   * Finding Filesystems
   * CS 241 - Spring 2019
   */
  int fsync(int fd) {
      FD_UNIMPLEMENTED(fd, 0);
      return orig_fsync(fd);
  }
  
  int fdatasync(int fd) {
      FD_UNIMPLEMENTED(fd, 0);
      return orig_fdatasync(fd);
  }
  
  void *mmap(void *addr, size_t length, int prot, int flags, int fd,
             off_t offset) {
      FD_UNIMPLEMENTED(fd, NULL);
      return orig_mmap(addr, length, prot, flags, fd, offset);
  }
  