---

yaml
---
r: 376711
b: refs/heads/master
c: f763fd4
h: refs/heads/master
i:
  376709: 765c76d
  376707: 62a686b
  376703: 5e17a50
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ad868afddb908a5d4015c6b7637721b48fb9c8f9
+refs/heads/master: f763fd440e094be37b38596ee14f1d64caa9bf9c

trunk/Documentation/filesystems/xfs.txt

@@ -33,6 +33,9 @@ When mounting an XFS filesystem, the following options are accepted.
 	removing extended attributes) the on-disk superblock feature
 	bit field will be updated to reflect this format being in use.
 
+	CRC enabled filesystems always use the attr2 format, and so
+	will reject the noattr2 mount option if it is set.
+
   barrier
 	Enables the use of block layer write barriers for writes into
 	the journal and unwritten extent conversion.  This allows for

trunk/fs/xfs/xfs_super.c

@@ -1372,6 +1372,17 @@ xfs_finish_flags(
 		}
 	}
 
+	/*
+	 * V5 filesystems always use attr2 format for attributes.
+	 */
+	if (xfs_sb_version_hascrc(&mp->m_sb) &&
+	    (mp->m_flags & XFS_MOUNT_NOATTR2)) {
+		xfs_warn(mp,
+"Cannot mount a V5 filesystem as %s. %s is always enabled for V5 filesystems.",
+			MNTOPT_NOATTR2, MNTOPT_ATTR2);
+		return XFS_ERROR(EINVAL);
+	}
+
 	/*
 	 * mkfs'ed attr2 will turn on attr2 mount unless explicitly
 	 * told by noattr2 to turn it off