1 files changed, 21 insertions, 0 deletions

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index 7f6f93c3df9c..1ab0d624fb36 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -26,6 +26,7 @@
 #include <linux/wait.h>
 #include <linux/atomic.h>
 #include <linux/workqueue.h>
+#include <linux/uidgid.h>
 
 #define UEVENT_HELPER_PATH_LEN          256
 #define UEVENT_NUM_ENVP                 32      /* number of env pointers */
@@ -114,14 +115,34 @@ extern struct kobject * __must_check kobject_get_unless_zero(
 extern void kobject_put(struct kobject *kobj);
 
 extern const void *kobject_namespace(struct kobject *kobj);
+extern void kobject_get_ownership(struct kobject *kobj,
+                                  kuid_t *uid, kgid_t *gid);
 extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
 
+/**
+ * kobject_has_children - Returns whether a kobject has children.
+ * @kobj: the object to test
+ *
+ * This will return whether a kobject has other kobjects as children.
+ *
+ * It does NOT account for the presence of attribute files, only sub
+ * directories. It also assumes there is no concurrent addition or
+ * removal of such children, and thus relies on external locking.
+ */
+static inline bool kobject_has_children(struct kobject *kobj)
+{
+        WARN_ON_ONCE(kref_read(&kobj->kref) == 0);
+
+        return kobj->sd && kobj->sd->dir.subdirs;
+}
+
 struct kobj_type {
         void (*release)(struct kobject *kobj);
         const struct sysfs_ops *sysfs_ops;
         struct attribute **default_attrs;
         const struct kobj_ns_type_operations *(*child_ns_type)(struct kobject *kobj);
         const void *(*namespace)(struct kobject *kobj);
+        void (*get_ownership)(struct kobject *kobj, kuid_t *uid, kgid_t *gid);
 };
 
 struct kobj_uevent_env {