XFS_INO_AGINO_BITS
XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
(((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
inodes = (1LL << XFS_INO_AGINO_BITS(mp)) >> XFS_INODES_PER_CHUNK_LOG;