xfs_initialize_perag
int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t orig_agcount,
error = xfs_initialize_perag(mp, orig_agcount, mp->m_sb.sb_agcount,
error = xfs_initialize_perag(mp, oagcount, nagcount, nb, &nagimax);
error = xfs_initialize_perag(mp, 0, sbp->sb_agcount,