linux-kernel - Re: [PATCH] nvmet: preserve controller serial number between reboots

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Message-ID: <20170713125212.GI5212@linux-x5ow.site>
Date:   Thu, 13 Jul 2017 14:52:12 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Sagi Grimberg <sagi@...mberg.me>
Cc:     Christoph Hellwig <hch@....de>,
        Keith Busch <keith.busch@...el.com>, mwilck@...e.de,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>
Subject: Re: [PATCH] nvmet: preserve controller serial number between reboots

On Thu, Jul 13, 2017 at 03:30:39PM +0300, Sagi Grimberg wrote:
> It seems weird that a subsystem has a serial.

The subsystem is more of a hack I admit. But we don't maintain
configurations for controllers in configfs, do we?

> I'm not sure that a dynamic controller should maintain
> a serial. Dynamic controllers by definition are allocated
> on demand with no state of prior associations. But not sure
> if a serial is a state (it probably isn't). The area is a little
> fuzzy for me.

I'm not certain as well, the only thing I know for sure currently is,
it changes but we use in the standard 60-persistent-storage.rules [1]
as a part of /dev/disk/by-id/nvme-$model-$serial-part%n [2] and I have a bit
of a headace when users use it to identify their partitions in say /etc/fstab
and the link changes as the target generated serial changes.

Maybe we should consider this more as an RFD than a patch.

I'm happy to withdraw if we find a better solution.

[1] https://github.com/systemd/systemd/blob/master/rules/60-persistent-storage.rules
[2] https://github.com/systemd/systemd/blob/master/rules/60-persistent-storage.rules#L27

Thanks,
	Johannes
-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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