ocfs2: Pack vote message and response structures

The ocfs2_vote_msg and ocfs2_response_msg structs needed to be
packed to ensure similar sizeofs in 32-bit and 64-bit arches. Without this,
we had inadvertantly broken 32/64 bit cross mounts.
Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

fs/ocfs2/vote.c

@@ -66,7 +66,7 @@ struct ocfs2_vote_msg
 {
 	struct ocfs2_msg_hdr v_hdr;
 	__be32 v_reserved1;
-};
+} __attribute__ ((packed));
 
 /* Responses are given these values to maintain backwards
  * compatibility with older ocfs2 versions */
@@ -78,7 +78,7 @@ struct ocfs2_response_msg
 {
 	struct ocfs2_msg_hdr r_hdr;
 	__be32 r_response;
-};
+} __attribute__ ((packed));
 
 struct ocfs2_vote_work {
 	struct list_head   w_list;