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 --cc fs/ocfs2/dlmglue.c
Simple merge

diff --cc fs/ocfs2/dlmglue.h
Simple merge

diff --cc fs/ocfs2/file.c
Simple merge

diff --cc fs/ocfs2/file.h
Simple merge

diff --cc fs/ocfs2/inode.c
Simple merge

diff --cc fs/ocfs2/ocfs2.h
Simple merge

diff --cc fs/ocfs2/super.c
Simple merge