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Date: Sat, 15 Jun 2002 21:49:50 +0200
To: Kurt Garloff <garloff@suse.de>,
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        Linux SCSI list <linux-scsi@vger.kernel.org>
From: Sancho Dauskardt <sancho@dauskardt.de>
Subject: Re: /proc/scsi/map
Cc: linux-usb-devel@lists.sourceforge.net,
        linux1394-devel@lists.sourceforge.net
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>Life would be easier if the scsi subsystem would just report which SCSI
>device (uniquely identified by the controller,bus,target,unit tuple) belongs
>to which high-level device. The information is available in the kernel.
>
>Attached patch does this:
>garloff@pckurt:/raid5/Kernel/src $ cat /proc/scsi/map
># C,B,T,U       Type    onl     sg_nm   sg_dev  nm      dev(hex)
>0,0,00,00       0x05    1       sg0     c:15:00 sr0     b:0b:00
[...]

Great, this was really missing badly.

But how about adding another column: GUID.
Most usb-storage and (all?) FireWire devices have such a unique identitiy.
In contrast to native SCSI devices, these emulated SCSI devices on 
hot-plugging busses will change their LUNs/IDs. Therefor the GUID is really 
a must to be able to create stable names (laptop suspend, etc.).

Both usb-storage and iee1394-sbp2 know the GUID. It only needs to be 
communicated..

I'd guess that FibreChannel has similar problems ?

- sda

-
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