xfs_dfsbno_t
xfs_dfsbno_t bb_leftsib; /* left sibling block or NULLDFSBNO */
xfs_dfsbno_t bb_rightsib; /* right sibling block or NULLDFSBNO */
xfs_dfsbno_t bb_leftsib;
xfs_dfsbno_t bb_rightsib;
typedef xfs_dfsbno_t xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; /* btree pointer type */
xfs_dfsbno_t sb_logstart; /* starting block of log if internal */