xfs_rtgroup_extents
xfs_rtxnum_t xfs_rtgroup_extents(struct xfs_mount *mp, xfs_rgnumber_t rgno);
if (rtx >= xfs_rtgroup_extents(mp, rgno))
usedlen = xfs_rtbxlen_to_blen(mp, xfs_rtgroup_extents(mp, sm->sm_agno));
return xfs_rtgroup_extents(mp, mp->m_sb.sb_rgcount - 1) <
start_rtx = xfs_rtgroup_extents(mp, rgno);
end_rtx = xfs_rtgroup_extents(nargs->mp, rgno);