ocfs2: core atime update functions

This patch adds the core routines for updating atime in ocfs2.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h
index a1165ed..c343fca 100644
--- a/fs/ocfs2/dlmglue.h
+++ b/fs/ocfs2/dlmglue.h
@@ -80,6 +80,9 @@
 		       int write);
 int ocfs2_rw_lock(struct inode *inode, int write);
 void ocfs2_rw_unlock(struct inode *inode, int write);
+int ocfs2_meta_lock_atime(struct inode *inode,
+			  struct vfsmount *vfsmnt,
+			  int *level);
 int ocfs2_meta_lock_full(struct inode *inode,
 			 struct buffer_head **ret_bh,
 			 int ex,