ocfs2: remove the /sys/o2cb symlink

It is obsoleted since Dec 2005.

Signed-off-by: WANG Cong <[e-mail]>
Signed-off-by: Joel Becker <[e-mail]>

Documentation/ABI/obsolete/o2cb Documentation/ABI/removed/o2cb

···
 What:		/sys/o2cb symlink
-Date:		Dec 2005
-KernelVersion:	2.6.16
+Date:		May 2011
+KernelVersion:	2.6.40
 Contact:	[e-mail]
-Description:	This is a symlink: /sys/o2cb to /sys/fs/o2cb. The symlink will
-		be removed when new versions of ocfs2-tools which know to look
+Description:	This is a symlink: /sys/o2cb to /sys/fs/o2cb. The symlink is
+		removed when new versions of ocfs2-tools which know to look
 		in /sys/fs/o2cb are sufficiently prevalent. Don't code new
 		software to look here, it should try /sys/fs/o2cb instead.
-		See Documentation/ABI/stable/o2cb for more information on usage.
 Users:		ocfs2-tools. It's sufficient to mail proposed changes to
 		[e-mail].

Documentation/feature-removal-schedule.txt

···
 
 ---------------------------
 
-What:	/sys/o2cb symlink
-When:	January 2010
-Why:	/sys/fs/o2cb is the proper location for this information - /sys/o2cb
-	exists as a symlink for backwards compatibility for old versions of
-	ocfs2-tools. 2 years should be sufficient time to phase in new versions
-	which know to look in /sys/fs/o2cb.
-Who:	[e-mail]
-
----------------------------
-
 What:	Ability for non root users to shm_get hugetlb pages based on mlock
 	resource limits
 When:	2.6.31

fs/ocfs2/cluster/sys.c

···
 void o2cb_sys_shutdown(void)
 {
 	mlog_sys_shutdown();
-	sysfs_remove_link(NULL, "o2cb");
 	kset_unregister(o2cb_kset);
 }
 
···
 	o2cb_kset = kset_create_and_add("o2cb", NULL, fs_kobj);
 	if (!o2cb_kset)
 		return -ENOMEM;
-
-	/*
-	 * Create this symlink for backwards compatibility with old
-	 * versions of ocfs2-tools which look for things in /sys/o2cb.
-	 */
-	ret = sysfs_create_link(NULL, &o2cb_kset->kobj, "o2cb");
-	if (ret)
-		goto error;
 
 	ret = sysfs_create_group(&o2cb_kset->kobj, &o2cb_attr_group);
 	if (ret)