xfs_fileoff_t
xfs_fileoff_t startoff = (*((uint64*)pointerToMap) & MASK(63)) >> 9;
xfs_fileoff_t br_startoff;
xfs_fileoff_t startoff = (B_BENDIAN_TO_HOST_INT64(*pointerToMap) & MASK(63)) >> 9;
#define XFS_KEY_SIZE sizeof(xfs_fileoff_t)
typedef xfs_fileoff_t TreeKey;