Merge tag 'xfs-4.16-merge-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull more xfs updates from Darrick Wong:
"As promised, here's a (much smaller) second pull request for the
second week of the merge cycle. This time around we have a couple
patches shutting off unsupported fs configurations, and a couple of
cleanups.

Last, we turn off EXPERIMENTAL for the reverse mapping btree, since
the primary downstream user of that information (online fsck) is now
upstream and I haven't seen any major failures in a few kernel
releases.

Summary:

- Print scrub build status in the xfs build info.

- Explicitly call out the remaining two scenarios where we don't
support reflink and never have.

- Remove EXPERIMENTAL tag from reverse mapping btree!"

* tag 'xfs-4.16-merge-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: remove experimental tag for reverse mapping
xfs: don't allow reflink + realtime filesystems
xfs: don't allow DAX on reflink filesystems
xfs: add scrub to XFS_BUILD_OPTIONS
xfs: fix u32 type usage in sb validation function

fs/xfs/libxfs/xfs_sb.c

···
 	bool		check_inprogress,
 	bool		check_version)
 {
-	u32		agcount = 0;
-	u32		rem;
+	uint32_t	agcount = 0;
+	uint32_t	rem;
 
 	if (sbp->sb_magicnum != XFS_SB_MAGIC) {
 		xfs_warn(mp, "bad magic number");

fs/xfs/xfs_super.c

···
 			"DAX unsupported by block device. Turning off DAX.");
 			mp->m_flags &= ~XFS_MOUNT_DAX;
 		}
-		if (xfs_sb_version_hasreflink(&mp->m_sb))
+		if (xfs_sb_version_hasreflink(&mp->m_sb)) {
 			xfs_alert(mp,
 		"DAX and reflink cannot be used together!");
+			error = -EINVAL;
+			goto out_filestream_unmount;
+		}
 	}
 
 	if (mp->m_flags & XFS_MOUNT_DISCARD) {
···
 		}
 	}
 
-	if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
-		if (mp->m_sb.sb_rblocks) {
-			xfs_alert(mp,
-	"EXPERIMENTAL reverse mapping btree not compatible with realtime device!");
-			error = -EINVAL;
-			goto out_filestream_unmount;
-		}
+	if (xfs_sb_version_hasreflink(&mp->m_sb) && mp->m_sb.sb_rblocks) {
 		xfs_alert(mp,
-	"EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!");
+	"reflink not compatible with realtime device!");
+		error = -EINVAL;
+		goto out_filestream_unmount;
+	}
+
+	if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
+		xfs_alert(mp,
+	"reverse mapping btree not compatible with realtime device!");
+		error = -EINVAL;
+		goto out_filestream_unmount;
 	}
 
 	error = xfs_mountfs(mp);

fs/xfs/xfs_super.h

···
 # define XFS_REALTIME_STRING
 #endif
 
+#ifdef CONFIG_XFS_ONLINE_SCRUB
+# define XFS_SCRUB_STRING	"scrub, "
+#else
+# define XFS_SCRUB_STRING
+#endif
+
 #ifdef DEBUG
 # define XFS_DBG_STRING		"debug"
 #else
···
 #define XFS_BUILD_OPTIONS	XFS_ACL_STRING \
 				XFS_SECURITY_STRING \
 				XFS_REALTIME_STRING \
+				XFS_SCRUB_STRING \
 				XFS_DBG_STRING /* DBG must be last */
 
 struct xfs_inode;