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struct dd_batmap_hdr {
  char   cookie[8];       /* should contain "tdbatmap"                    */
  u64    batmap_offset;   /* byte offset to batmap                        */  <--- This is the offset to where the allocation tables reside after this struct
  u32    batmap_size;     /* batmap size in sectors                       */
  u32    batmap_version;  /* version of batmap                            */
  u32    checksum;        /* batmap checksum -- 1's complement of batmap  */
  /* We add extra stuffs here like the keyhash but the batmap_offset is adjusted to skip them */
};