[XFS] Rework fid encode/decode wrt 64 bit inums interacting with NFS.

SGI-PV: 937127
SGI-Modid: xfs-linux:xfs-kern:24201a

Signed-off-by: Nathan Scott <nathans@sgi.com>
diff --git a/fs/xfs/linux-2.6/xfs_vfs.h b/fs/xfs/linux-2.6/xfs_vfs.h
index d5fb28f..57caf9e 100644
--- a/fs/xfs/linux-2.6/xfs_vfs.h
+++ b/fs/xfs/linux-2.6/xfs_vfs.h
@@ -81,6 +81,7 @@
 #define VFS_RDONLY		0x0001	/* read-only vfs */
 #define VFS_GRPID		0x0002	/* group-ID assigned from directory */
 #define VFS_DMI			0x0004	/* filesystem has the DMI enabled */
+#define VFS_32BITINODES		0x0008	/* do not use inums above 32 bits */
 #define VFS_END			0x0008	/* max flag */
 
 #define SYNC_ATTR		0x0001	/* sync attributes */