1 files changed, 12 insertions, 0 deletions
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 1ac0b0facb7f..bc53f5c7357c 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1532,6 +1532,18 @@ xfs_swap_extents(
 		goto out_unlock;
 	}
 
+	/*
+	 * The rmapbt implementation is unable to resume a swapext operation
+	 * after a crash if the allocation unit size is larger than a block.
+	 * This (deprecated) interface will not be upgraded to handle this
+	 * situation.  Defragmentation must be performed with the commit range
+	 * ioctl.
+	 */
+	if (XFS_IS_REALTIME_INODE(ip) && xfs_has_rtgroups(ip->i_mount)) {
+		error = -EOPNOTSUPP;
+		goto out_unlock;
+	}
+
 	error = xfs_qm_dqattach(ip);
 	if (error)
 		goto out_unlock;