Merge branch 'sysfs' into linux-next

Conflicts:

	Documentation/feature-removal-schedule.txt

5 files changed, 48 insertions, 1 deletions

diff --git a/Documentation/ABI/obsolete/o2cb b/Documentation/ABI/obsolete/o2cb
new file mode 100644
index 000000000000..9c49d8e6c0cc
--- /dev/null
+++ b/Documentation/ABI/obsolete/o2cb
@@ -0,0 +1,11 @@
+What:		/sys/o2cb symlink
+Date:		Dec 2005
+KernelVersion:	2.6.16
+Contact:	ocfs2-devel@oss.oracle.com
+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
+		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
+		ocfs2-devel@oss.oracle.com.
diff --git a/Documentation/ABI/stable/o2cb b/Documentation/ABI/stable/o2cb
new file mode 100644
index 000000000000..5eb1545e0b8d
--- /dev/null
+++ b/Documentation/ABI/stable/o2cb
@@ -0,0 +1,10 @@
+What:		/sys/fs/o2cb/ (was /sys/o2cb)
+Date:		Dec 2005
+KernelVersion:	2.6.16
+Contact:	ocfs2-devel@oss.oracle.com
+Description:	Ocfs2-tools looks at 'interface-revision' for versioning
+		information. Each logmask/ file controls a set of debug prints
+		and can be written into with the strings "allow", "deny", or
+		"off". Reading the file returns the current state.
+Users:		ocfs2-tools. It's sufficient to mail proposed changes to
+		ocfs2-devel@oss.oracle.com.
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 4d3aa519eadf..700783fa40eb 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -306,3 +306,13 @@ Why:	Largely unmaintained and almost entirely unused.  File system
 	is largely pointless as without a lot of work only the most
 	trivial of Solaris binaries can work with the emulation code.
 Who:	David S. Miller <davem@davemloft.net>
+
+---------------------------
+
+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:	ocfs2-devel@oss.oracle.com
diff --git a/fs/ocfs2/cluster/sys.c b/fs/ocfs2/cluster/sys.c
index 0c095ce7723d..98429fd68499 100644
--- a/fs/ocfs2/cluster/sys.c
+++ b/fs/ocfs2/cluster/sys.c
@@ -57,6 +57,7 @@ static struct kset *o2cb_kset;
 void o2cb_sys_shutdown(void)
 {
 	mlog_sys_shutdown();
+	sysfs_remove_link(NULL, "o2cb");
 	kset_unregister(o2cb_kset);
 }
 
@@ -68,6 +69,14 @@ int o2cb_sys_init(void)
 	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)
 		goto error;
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index 5f66c4466151..817f5966edca 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -87,7 +87,14 @@ int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char
 
 void sysfs_remove_link(struct kobject * kobj, const char * name)
 {
-	sysfs_hash_and_remove(kobj->sd, name);
+	struct sysfs_dirent *parent_sd = NULL;
+
+	if (!kobj)
+		parent_sd = &sysfs_root;
+	else
+		parent_sd = kobj->sd;
+
+	sysfs_hash_and_remove(parent_sd, name);
 }
 
 static int sysfs_get_target_path(struct sysfs_dirent *parent_sd,