[PATCH 1/7] dm/md dependency tree in sysfs: kobject_add_dir

[Jun'ichi Nomura]

This patch is part of dm/md dependency tree in sysfs.

This adds kobject_add_dir() function which creates a subdirectory
for a given kobject.

Thanks,
-- 
Jun'ichi Nomura, NEC Solutions (America), Inc.
Adding kobject_add_dir() function which creates a subdirectory
for a given kobject.

Signed-off-by: Jun'ichi Nomura <j-nomura@xxxxxxxxxxxxx>

 include/linux/kobject.h |    2 ++
 lib/kobject.c           |   37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

--- linux-2.6.16-rc6.orig/include/linux/kobject.h	2006-03-11 17:12:55.000000000 -0500
+++ linux-2.6.16-rc6/include/linux/kobject.h	2006-03-13 11:23:55.000000000 -0500
@@ -80,6 +80,8 @@ extern void kobject_unregister(struct ko
 extern struct kobject * kobject_get(struct kobject *);
 extern void kobject_put(struct kobject *);
 
+extern struct kobject * kobject_add_dir(struct kobject *, const char *);
+
 extern char * kobject_get_path(struct kobject *, gfp_t);
 
 struct kobj_type {
--- linux-2.6.16-rc6.orig/lib/kobject.c	2006-03-11 17:12:55.000000000 -0500
+++ linux-2.6.16-rc6/lib/kobject.c	2006-03-13 11:23:55.000000000 -0500
@@ -379,6 +379,43 @@ void kobject_put(struct kobject * kobj)
 }
 
 
+static void dir_release(struct kobject *kobj)
+{
+	kfree(kobj);
+}
+
+static struct kobj_type dir_ktype = {
+	.release	= dir_release,
+	.sysfs_ops	= NULL,
+	.default_attrs	= NULL,
+};
+
+/**
+ *	kobject_add_dir - add sub directory of object.
+ *	@parent:	object in which a directory is created.
+ *	@name:	directory name.
+ *
+ *	Add a plain directory object as child of given object.
+ */
+struct kobject *kobject_add_dir(struct kobject *parent, const char *name)
+{
+	struct kobject *k;
+
+	if (!parent)
+		return NULL;
+
+	k = kzalloc(sizeof(*k), GFP_KERNEL);
+	if (!k)
+		return NULL;
+
+	k->parent = parent;
+	k->ktype = &dir_ktype;
+	kobject_set_name(k, name);
+	kobject_register(k);
+
+	return k;
+}
+
 /**
  *	kset_init - initialize a kset for use
  *	@k:	kset