linux-kernel - Re: [PATCH 1/2] SCSI: Add a SCSI option for persistent device names in Kernel.

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Message-ID: <20110408161420.GB12111@kroah.com>
Date:	Fri, 8 Apr 2011 09:14:20 -0700
From:	Greg KH <greg@...ah.com>
To:	James Bottomley <James.Bottomley@...e.de>
Cc:	Hannes Reinecke <hare@...e.de>,
	Nao Nishijima <nao.nishijima.xt@...achi.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-hotplug@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>,
	Jon Masters <jcm@...hat.com>, 2nddept-manager@....hitachi.co.jp
Subject: Re: [PATCH 1/2] SCSI: Add a SCSI option for persistent device names
 in Kernel.

On Fri, Apr 08, 2011 at 08:14:12AM -0700, James Bottomley wrote:
> So, while I agree totally with the above: udev and userspace is the way
> to go, I'm not totally opposed to having a non-invasive mechanism for
> indicating a user's preferred name for a device.  I think there are a
> couple of ways to do this:
> 
>      1. Entirely in userspace: just have udev consult a preferred name
>         file and create say /dev/disk/by-preferred.  Then have all the
>         tools that normally output device information do the same (i.e.
>         since real name to preferred name is 1:1, they could all do a
>         reverse lookup).
>      2. have a writeable sysfs preferred_name field, either in the
>         generic device or just in SCSI.  The preferred name would be
>         used by outbound only (i.e. kernel dev_printk messages and
>         possibly /proc/partitions).  All inbound uses of the device
>         would come via the standard udev mechanisms
>         (i.e. /dev/disk/by-preferred would be the usual symlink).  This
>         means from the kernel point of view, no renaming has happened.
>         We'd just try to print out the preferred name in certain
>         circumstances, which should solve most of the described problem.

Either, or both, of those options are fine with me as well.

thanks,

greg k-h
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