From: Michael Hamilton <michael@actrix.gen.nz>
To: linux-hotplug@vger.kernel.org
Subject: Re: usb-mount (hotplug + desktop hooks)
Date: Thu, 07 Nov 2002 05:03:16 +0000 [thread overview]
Message-ID: <marc-linux-hotplug-103664564718657@msgid-missing> (raw)
In-Reply-To: <marc-linux-hotplug-103558971618973@msgid-missing>
On Thu, 07 Nov 2002 04:53, Gary_Lerhaupt@Dell.com wrote:
> I checked /proc/scsi/usb-storage-0 after plugging in my flashcard reader.
> In my particular case, the device returned a Serial Number of "None" but
> did return what appeared to be an interesting and unique GUID value.
> Michael, did you comments about the non-uniqueness of serial numbers also
> extend to GUIDs?
>
> If not, I could immediately add USB GUIDs where applicable within devlabel
> and then automounting would be simple. Do your two USB storage devices
> return different (yet consistent) GUID values?
>
> Gary
> devlabel: www.domsch.com/linux/devlabel
I've already investigated this path. Here's a summary...
I have two identical devices - lets call them A and B to save any
confusion.
1) Plug in device A:
viking2:~ % cat /proc/scsi/usb-storage-0/0
Host scsi0: usb-storage
Vendor: Neodio Technologies Corp.
Product: Neodio USB Storage Device
Serial Number: 0AEC501000001A002
Protocol: Transparent SCSI
Transport: Bulk
GUID: 0aec5010aec501000001a002
Attached: Yes
2) Unplug device A and plug it in again - note the serial and GUID
are based on the same attributes - the vendor, product and bus
location.
viking2:~ % cat /proc/scsi/usb-storage-0/0
Host scsi0: usb-storage
Vendor: Neodio Technologies Corp.
Product: Neodio USB Storage Device
Serial Number: 0AEC501000001A003
Protocol: Transparent SCSI
Transport: Bulk
GUID: 0aec5010aec501000001a003
Attached: Yes
3) Plug in device B - note that it has the Serial and GUID we saw
in step (1) above.
viking2:~ % cat /proc/scsi/usb-storage-1/0
Host scsi0: usb-storage
Vendor: Neodio Technologies Corp.
Product: Neodio USB Storage Device
Serial Number: 0AEC501000001A002
Protocol: Transparent SCSI
Transport: Bulk
GUID: 0aec5010aec501000001a002
Attached: Yes
4) Unplug device B and plug it in again- note it now has the same
serial and GUID as device A which is still plugged in.
viking2:~ % cat /proc/scsi/usb-storage-1/0
Host scsi0: usb-storage
Vendor: Neodio Technologies Corp.
Product: Neodio USB Storage Device
Serial Number: 0AEC501000001A003
Protocol: Transparent SCSI
Transport: Bulk
GUID: 0aec5010aec501000001a003
Attached: Yes
viking2:~ % cat /proc/scsi/usb-storage-0/0
Host scsi0: usb-storage
Vendor: Neodio Technologies Corp.
Product: Neodio USB Storage Device
Serial Number: 0AEC501000001A003
Protocol: Transparent SCSI
Transport: Bulk
GUID: 0aec5010aec501000001a003
Attached: Yes
Not very nice. I guess the scsi device id could be added
to the serial or GUID to provide a unique identifier that
will last as long as the device is plugged in.
Michael
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next prev parent reply other threads:[~2002-11-07 5:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-25 23:46 usb-mount (hotplug + desktop hooks) David Brownell
2002-10-26 9:35 ` Oliver Neukum
2002-10-28 21:52 ` Gary_Lerhaupt
2002-11-02 23:32 ` Michael Hamilton
2002-11-04 16:38 ` Gary_Lerhaupt
2002-11-05 9:46 ` Michael Hamilton
2002-11-06 4:23 ` Ajay
2002-11-06 9:21 ` Michael Hamilton
2002-11-06 15:53 ` Gary_Lerhaupt
2002-11-07 5:03 ` Michael Hamilton [this message]
2002-11-07 16:05 ` Gary_Lerhaupt
2002-11-11 8:11 ` Michael Hamilton
2002-11-11 15:39 ` Gary_Lerhaupt
2002-11-13 8:55 ` Michael Hamilton
2002-11-21 20:30 ` David Brownell
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