1 files changed, 19 insertions, 14 deletions

diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 118d31e11127..01b5f5b32af4 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -421,6 +421,8 @@ xfs_trans_mod_sb(
 			ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
 		}
 		tp->t_frextents_delta += delta;
+		if (xfs_has_rtgroups(mp))
+			flags &= ~XFS_TRANS_SB_DIRTY;
 		break;
 	case XFS_TRANS_SB_RES_FREXTENTS:
 		/*
@@ -430,6 +432,8 @@ xfs_trans_mod_sb(
 		 */
 		ASSERT(delta < 0);
 		tp->t_res_frextents_delta += delta;
+		if (xfs_has_rtgroups(mp))
+			flags &= ~XFS_TRANS_SB_DIRTY;
 		break;
 	case XFS_TRANS_SB_DBLOCKS:
 		tp->t_dblocks_delta += delta;
@@ -498,20 +502,22 @@ xfs_trans_apply_sb_deltas(
 	}
 
 	/*
-	 * Updating frextents requires careful handling because it does not
-	 * behave like the lazysb counters because we cannot rely on log
-	 * recovery in older kenels to recompute the value from the rtbitmap.
-	 * This means that the ondisk frextents must be consistent with the
-	 * rtbitmap.
+	 * sb_frextents was added to the lazy sb counters when the rt groups
+	 * feature was introduced.  This is possible because we know that all
+	 * kernels supporting rtgroups will also recompute frextents from the
+	 * realtime bitmap.
+	 *
+	 * For older file systems, updating frextents requires careful handling
+	 * because we cannot rely on log recovery in older kernels to recompute
+	 * the value from the rtbitmap.  This means that the ondisk frextents
+	 * must be consistent with the rtbitmap.
 	 *
 	 * Therefore, log the frextents change to the ondisk superblock and
 	 * update the incore superblock so that future calls to xfs_log_sb
 	 * write the correct value ondisk.
-	 *
-	 * Don't touch m_frextents because it includes incore reservations,
-	 * and those are handled by the unreserve function.
 	 */
-	if (tp->t_frextents_delta || tp->t_res_frextents_delta) {
+	if ((tp->t_frextents_delta || tp->t_res_frextents_delta) &&
+	    !xfs_has_rtgroups(tp->t_mountp)) {
 		struct xfs_mount	*mp = tp->t_mountp;
 		int64_t			rtxdelta;
 
@@ -619,7 +625,7 @@ xfs_trans_unreserve_and_mod_sb(
 	}
 
 	ASSERT(tp->t_rtx_res || tp->t_frextents_delta >= 0);
-	if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
+	if (xfs_has_rtgroups(mp) || (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
 		rtxdelta += tp->t_frextents_delta;
 		ASSERT(rtxdelta >= 0);
 	}
@@ -652,10 +658,9 @@ xfs_trans_unreserve_and_mod_sb(
 	mp->m_sb.sb_icount += idelta;
 	mp->m_sb.sb_ifree += ifreedelta;
 	/*
-	 * Do not touch sb_frextents here because we are dealing with incore
-	 * reservation.  sb_frextents is not part of the lazy sb counters so it
-	 * must be consistent with the ondisk rtbitmap and must never include
-	 * incore reservations.
+	 * Do not touch sb_frextents here because it is handled in
+	 * xfs_trans_apply_sb_deltas for file systems where it isn't a lazy
+	 * counter anyway.
 	 */
 	mp->m_sb.sb_dblocks += tp->t_dblocks_delta;
 	mp->m_sb.sb_agcount += tp->t_agcount_delta;