Re: [PATCH 1/2] SCSI: Add a SCSI option for persistent device namesin Kernel.

From: Kay Sievers
Date: Fri Apr 08 2011 - 12:43:36 EST

On Fri, Apr 8, 2011 at 18:14, Greg KH <greg@xxxxxxxxx> wrote:
> 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. ÂI think there are a
>> couple of ways to do this:
>> Â Â Â1. Entirely in userspace: just have udev consult a preferred name
>> Â Â Â Â file and create say /dev/disk/by-preferred. ÂThen have all the
>> Â Â Â Â tools that normally output device information do the same (i.e.
>> Â Â Â Â since real name to preferred name is 1:1, they could all do a
>> Â Â Â Â reverse lookup).
>> Â Â Â2. have a writeable sysfs preferred_name field, either in the
>> Â Â Â Â generic device or just in SCSI. ÂThe preferred name would be
>> Â Â Â Â used by outbound only (i.e. kernel dev_printk messages and
>> Â Â Â Â possibly /proc/partitions). ÂAll inbound uses of the device
>> Â Â Â Â would come via the standard udev mechanisms
>> Â Â Â Â (i.e. /dev/disk/by-preferred would be the usual symlink). ÂThis
>> Â Â Â Â means from the kernel point of view, no renaming has happened.
>> Â Â Â Â We'd just try to print out the preferred name in certain
>> Â Â Â Â circumstances, which should solve most of the described problem.
> Either, or both, of those options are fine with me as well.

I guess a generic sysfs file, that can carry a user-given name for a
device, and which is looked-up with dev_printk() macro, and maybe
/proc/partitions is all what we would need if we want to involve the
kernel here.

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