xfs_rtgroup_next_range
return xfs_rtgroup_next_range(mp, rtg, 0, mp->m_sb.sb_rgcount - 1);
while ((rtg = xfs_rtgroup_next_range(mp, rtg, start_rgno, end_rgno))) {
while ((rtg = xfs_rtgroup_next_range(mp, rtg, start_rgno, end_rgno))) {
while ((rtg = xfs_rtgroup_next_range(mp, rtg, start_rg, end_rg))) {