netdev - [PATCH 2/5] class: Implement support for class attrs in tagged sysfs directories.

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Date:	Thu, 13 Oct 2011 00:55:08 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	David Miller <davem@...emloft.net>, <linux-kernel@...r.kernel.org>,
	<netdev@...r.kernel.org>, Tejun Heo <htejun@...il.com>,
	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>
Subject: [PATCH 2/5] class: Implement support for class attrs in tagged sysfs directories.


Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 drivers/base/class.c   |   17 +++++++++++++++--
 include/linux/device.h |    2 ++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/base/class.c b/drivers/base/class.c
index 4f1df2e..b80d91c 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -47,6 +47,18 @@ static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr,
 	return ret;
 }
 
+static const void *class_attr_namespace(struct kobject *kobj,
+					const struct attribute *attr)
+{
+	struct class_attribute *class_attr = to_class_attr(attr);
+	struct subsys_private *cp = to_subsys_private(kobj);
+	const void *ns = NULL;
+
+	if (class_attr->namespace)
+		ns = class_attr->namespace(cp->class, class_attr);
+	return ns;
+}
+
 static void class_release(struct kobject *kobj)
 {
 	struct subsys_private *cp = to_subsys_private(kobj);
@@ -72,8 +84,9 @@ static const struct kobj_ns_type_operations *class_child_ns_type(struct kobject
 }
 
 static const struct sysfs_ops class_sysfs_ops = {
-	.show	= class_attr_show,
-	.store	= class_attr_store,
+	.show	   = class_attr_show,
+	.store	   = class_attr_store,
+	.namespace = class_attr_namespace,
 };
 
 static struct kobj_type class_ktype = {
diff --git a/include/linux/device.h b/include/linux/device.h
index c20dfbf..ea70bb2 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -350,6 +350,8 @@ struct class_attribute {
 			char *buf);
 	ssize_t (*store)(struct class *class, struct class_attribute *attr,
 			const char *buf, size_t count);
+	const void *(*namespace)(struct class *class,
+				 const struct class_attribute *attr);
 };
 
 #define CLASS_ATTR(_name, _mode, _show, _store)			\
-- 
1.7.2.5

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