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[3/9] kobject: kset_create_and_add() - fetch ownership info from parent

Message ID 1532991076-3672-4-git-send-email-tyhicks@canonical.com
State New
Headers show
Series Make /sys/class/net per net namespace objects belong to container | expand

Commit Message

Tyler Hicks July 30, 2018, 10:51 p.m. UTC 
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

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 linux-next)
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
---
 lib/kobject.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
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Patch

diff --git a/lib/kobject.c b/lib/kobject.c
index f2dc1f756007..389829d3a1d1 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -887,9 +887,16 @@  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,
 };
 
 /**