XFS_BUF_TO_AGFL
struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp);
struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp);
if (!xfs_log_check_lsn(mp, be64_to_cpu(XFS_BUF_TO_AGFL(bp)->agfl_lsn)))
XFS_BUF_TO_AGFL(bp)->agfl_lsn = cpu_to_be64(bip->bli_item.li_lsn);
agfl = XFS_BUF_TO_AGFL(agfl_bp);