From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greg KH <greg@kroah.com>
Date: Thu, 04 Nov 2004 18:18:20 +0000
Subject: Re: add the physical device and the bus to the hotplug environment
Message-Id: <20041104181820.GA17022@kroah.com>
List-Id: <linux-hotplug.vger.kernel.org>
References: <20041104024428.GA17927@vrfy.org>
In-Reply-To: <20041104024428.GA17927@vrfy.org>
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To: linux-hotplug@vger.kernel.org

On Thu, Nov 04, 2004 at 03:44:28AM +0100, Kay Sievers wrote:
> Add the sysfs path of the physical device to the hotplug event of class
> and block devices. This should solve the userspace issue not to know if
> the device is a virtual one and the "device" symlink will never be create=
d,
> but we sit there and wait for it to show up not knowing when we should
> give up.
>=20
> Also the bus name is added to the hotplug event, so we don't need to
> reverse lookup in the /sys/bus/* directory which bus our physical
> device belongs to. This is e.g. the value matched against the BUS=3D key,
> that may be used in an udev rule.
>=20
> This is a PCI network card:
>   ACTION=ADd
>   SUBSYSTEM=3Dnet
>   DEVPATH=3D/class/net/eth0
>   PHYSDEVPATH=3D/devices/pci0000:00/0000:00:1e.0/0000:02:01.0
>   PHYSDEVBUS=3Dpci
>   INTERFACE=3Deth0
>   SEQNUM=827
>   PATH=3D/sbin:/bin:/usr/sbin:/usr/bin
>   HOME=3D/
>=20
> This is a IDE CDROM:
>   ACTION=ADd
>   SUBSYSTEM=3Dblock
>   DEVPATH=3D/block/hdc
>   PHYSDEVPATH=3D/devices/pci0000:00/0000:00:1f.1/ide1/1.0
>   PHYSDEVBUS=3Dide
>   SEQNUM=1017
>   PATH=3D/sbin:/bin:/usr/sbin:/usr/bin
>   HOME=3D/
>=20
> This is an USB-stick partition:
>   ACTION=ADd
>   SUBSYSTEM=3Dblock
>   DEVPATH=3D/block/sda/sda1
>   PHYSDEVPATH=3D/devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/host1/t=
arget1:0:0/1:0:0:0
>   PHYSDEVBUS=3Dscsi
>   SEQNUM=1032
>   PATH=3D/sbin:/bin:/usr/sbin:/usr/bin
>   HOME=3D/
>=20
>=20
> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>

Very nice, I like this a lot.  Should make userspace logic a lot simpler
now.  I've applied this to my trees.

thanks,

greg k-h


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