struct statfs {
  unsigned long f_type, f_bsize, f_frsize;
  fsblkcnt_t f_blocks, f_bfree;
  fsfilcnt_t f_files, f_ffree;
  fsblkcnt_t f_bavail;
  fsid_t f_fsid;
  unsigned long f_namelen, f_flags, f_spare[5];
};