kobject: kset_create_and_add() - fetch ownership info from parent

BugLink: https://launchpad.net/bugs/1784501
This change implements get_ownership() for ksets created with
kset_create_and_add() call by fetching ownership data from parent kobject.
This is done mostly for benefit of "queues" attribute of net devices so
that corresponding directory belongs to container's root instead of global
root for network devices in a container.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit d028b6f703209dbe96201b2714ff46625877128e)
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Kleber Souza <kleber.souza@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/lib/kobject.c b/lib/kobject.c
index 4a530e93a0cedcd20c3f5eba807ee3789fef7f7a..65edcc8334319c9dbe5aadd7f1c080011008b393 100644 (file)
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -891,9 +891,16 @@ static void kset_release(struct kobject *kobj)
        kfree(kset);
 }
 
+void kset_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid)
+{
+       if (kobj->parent)
+               kobject_get_ownership(kobj->parent, uid, gid);
+}
+
 static struct kobj_type kset_ktype = {
        .sysfs_ops      = &kobj_sysfs_ops,
-       .release = kset_release,
+       .release        = kset_release,
+       .get_ownership  = kset_get_ownership,
 };
 
 /**