ocfs2: Free up some space in the lvb

lvb_version doesn't need to be a whole 32 bits. Make it an 8 bit field to
free up some space. This should be backwards compatible until we use one of
the fields, in which case we'd bump the lvb version anyway.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h
index 3402515..3476a16 100644
--- a/fs/ocfs2/dlmglue.h
+++ b/fs/ocfs2/dlmglue.h
@@ -32,7 +32,9 @@
 #define OCFS2_LVB_VERSION 3
 
 struct ocfs2_meta_lvb {
-	__be32       lvb_version;
+	__be16       lvb_reserved0;
+	__u8         lvb_reserved1;
+	__u8         lvb_version;
 	__be32       lvb_iclusters;
 	__be32       lvb_iuid;
 	__be32       lvb_igid;