[GFS2] Shrink gfs2_inode (8) - i_vn

This shrinks the size of the gfs2_inode by 8 bytes by
replacing the version counter with a one bit valid/invalid
flag.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index c0a8c3b..227a74d 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -217,6 +217,7 @@
 };
 
 enum {
+	GIF_INVALID		= 0,
 	GIF_QD_LOCKED		= 1,
 	GIF_PAGED		= 2,
 	GIF_SW_PAGED		= 3,
@@ -228,7 +229,6 @@
 
 	unsigned long i_flags;		/* GIF_... */
 
-	u64 i_vn;
 	struct gfs2_dinode_host i_di; /* To be replaced by ref to block */
 
 	struct gfs2_glock *i_gl; /* Move into i_gh? */