xfs_agnumber_t
xfs_agnumber_t agNo = INO_TO_AGNO(fId, fVolume);
#define INO_TO_AGNO(id, volume) ((xfs_agnumber_t)id >> (volume->AgInodeBits()))
xfs_agnumber_t AgCount() const
xfs_agnumber_t
xfs_agnumber_t sb_agcount;
xfs_agnumber_t AgCount() const;