grub_u_int64_t
grub_u_int64_t di_size; /* 8: File byte count. */
grub_u_int64_t di_size; /* 16: File byte count. */
grub_u_int64_t di_blocks; /* 24: Bytes actually held. */
grub_u_int64_t fs_maxfilesize; /* maximum representable file size */