class: Implement support for class attrs in tagged sysfs directories.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/base/class.c b/drivers/base/class.c
index 4f1df2e..b80d91c 100644 (file)
--- 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 (file)
--- 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)                        \