linux-kernel - Re: [Patch -mm 2/5] driver core: Introduce device

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Date:	Wed, 15 Nov 2006 10:24:09 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	"Kay Sievers" <kay.sievers@...y.org>
Cc:	"Greg KH" <greg@...ah.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...l.org>,
	"Martin Schwidefsky" <schwidefsky@...ibm.com>
Subject: Re: [Patch -mm 2/5] driver core: Introduce device_move(): move a
 device to a new parent.

On Wed, 15 Nov 2006 09:44:33 +0100,
"Kay Sievers" <kay.sievers@...y.org> wrote:

> Udev and HAL, both will need an event for the moving, with the old
> DEVPATH value in the environment. We want something like a "rename" or
> "move" event. Without that, weird things will happen in userspace,
> because the devpath is used as the key to the device during the whole
> device lifetime. The only weird exception today is the netif rename
> case, which is already handled by special code in udev.

Something like below (completely untested as my test box is currently
inaccessible)? Wouldn't we need something similar for kobject_rename()
as well?

---
 include/linux/kobject.h |    1 +
 lib/kobject.c           |    1 +
 2 files changed, 2 insertions(+)

--- linux-2.6-CH.orig/include/linux/kobject.h
+++ linux-2.6-CH/include/linux/kobject.h
@@ -47,6 +47,7 @@ enum kobject_action {
 	KOBJ_UMOUNT	= (__force kobject_action_t) 0x05,	/* umount event for block devices (broken) */
 	KOBJ_OFFLINE	= (__force kobject_action_t) 0x06,	/* device offline */
 	KOBJ_ONLINE	= (__force kobject_action_t) 0x07,	/* device online */
+	KOBJ_MOVE	= (__force kobject_action_t) 0x08,	/* device move */
 };
 
 struct kobject {
--- linux-2.6-CH.orig/lib/kobject.c
+++ linux-2.6-CH/lib/kobject.c
@@ -379,6 +379,7 @@ int kobject_move(struct kobject *kobj, s
 	old_parent = kobj->parent;
 	kobj->parent = new_parent;
 	kobject_put(old_parent);
+	kobject_uevent(kobj, KOBJ_MOVE);
 out:
 	kobject_put(kobj);
 	return error;
-
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