diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index 2e90e89..b5c6856 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -96,10 +96,19 @@
  */
 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV	0x0002
 
+/*
+ * tunefs sets this incompat flag before starting the resize and clears it
+ * at the end. This flag protects users from inadvertently mounting the fs
+ * after an aborted run without fsck-ing.
+ */
+#define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG    0x0004
 
 /* Used to denote a non-clustered volume */
 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT	0x0008
 
+/* Support for sparse allocation in b-trees */
+#define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC	0x0010
+
 /*
  * Flags on ocfs2_dinode.i_flags
  */