ocfs2: add POSIX ACL API

This patch adds POSIX ACL(access control lists) APIs in ocfs2. We convert
struct posix_acl to many ocfs2_acl_entry and regard them as an extended
attribute entry.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

diff --cc fs/ocfs2/Makefile
Simple merge

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

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

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

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

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