ocfs2: add mount option and Kconfig option for acl

This patch adds the Kconfig option "CONFIG_OCFS2_FS_POSIX_ACL"
and mount options "acl" to enable acls in Ocfs2.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
diff --git a/fs/Kconfig b/fs/Kconfig
index ff0e819..e8a47f7 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -268,6 +268,15 @@
 	  is backwards compatible with JBD.  It is safe to say N here.
 	  However, if you really want to use the original JBD, say Y here.
 
+config OCFS2_FS_POSIX_ACL
+	bool "OCFS2 POSIX Access Control Lists"
+	depends on OCFS2_FS
+	select FS_POSIX_ACL
+	default n
+	help
+	  Posix Access Control Lists (ACLs) support permissions for users and
+	  groups beyond the owner/group/world scheme.
+
 endif # BLOCK
 
 source "fs/notify/Kconfig"