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From: Kay Sievers <kay.sievers@vrfy.org>
To: linux-hotplug@vger.kernel.org
Subject: Re: not all volume types export UUIDs (was: /dev/disk/by-id
Date: Wed, 02 Jul 2008 16:06:37 +0000	[thread overview]
Message-ID: <1215014797.9721.41.camel@linux.site> (raw)
In-Reply-To: <20080702102820.GB16076@piper.oerlikon.madduck.net>

On Wed, 2008-07-02 at 17:49 +0200, martin f krafft wrote:
> also sprach Kay Sievers <kay.sievers@vrfy.org> [2008.07.02.1619 +0200]:
> > What kind of id's do you have in mind, which would be the same across
> > buses?
> 
> I don't. I am trying to understand why the bus type is an integral
> part of the /dev/disk/by-id/* links.

Because it's the USB-serial-number, the ATA-serial-string, the
SCSI-INQUIRY-serial-string, the FireWire-gid-number, the dm-name-string,
the md-name-string, the SD-flash-card serial, ..., and not a unique id
on its own. All are only unique per namespace/bus, and should better not
be mixed. 

The exception which would allow us moving the number around is ATA
devices using SCSI, because ATA synthesizes all SCSI data, but I think
we better just create two links in this case, instead of trying to move
all different id's into one namespace.

Thanks,
Kay


  parent reply	other threads:[~2008-07-02 16:06 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-02 10:28 not all volume types export UUIDs (was: /dev/disk/by-id symlinks martin f krafft
2008-07-02 14:19 ` not all volume types export UUIDs (was: /dev/disk/by-id Kay Sievers
2008-07-02 15:49 ` martin f krafft
2008-07-02 15:56 ` Greg KH
2008-07-02 16:06 ` Kay Sievers [this message]
2008-07-02 16:17 ` Karl O. Pinc
2008-07-02 16:28 ` not all volume types export UUIDs (was: /dev/disk/by-id symlinks should not include bus) type Kay Sievers
2008-07-03  5:30 ` not all volume types export UUIDs (was: /dev/disk/by-id martin f krafft
2008-07-03  9:02 ` Kay Sievers
2008-07-03 13:42 ` not all volume types export UUIDs (was: /dev/disk/by-id symlinks should not include bus) type Matthew Dharm
2008-07-03 15:12 ` not all volume types export UUIDs (was: /dev/disk/by-id Kay Sievers
2008-07-03 15:33 ` not all volume types export UUIDs (was: /dev/disk/by-id symlinks should not include bus) type Matthew Dharm
2008-07-03 15:36 ` not all volume types export UUIDs (was: /dev/disk/by-id Kay Sievers
2008-07-05 11:55 ` martin f krafft
2008-07-05 12:32 ` Kay Sievers

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