linux-kernel - Re: [Nbd] [RFC 4/4] nbd: Add support for nbd as root device

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Message-ID: <20150131154500.GK16879@pengutronix.de>
Date:	Sat, 31 Jan 2015 16:45:00 +0100
From:	Markus Pargmann <mpa@...gutronix.de>
To:	Andreas Klauer <Andreas.Klauer@...amorpher.de>
Cc:	Paul Clements <paul.clements@...sios.com>,
	"nbd-general@...ts.sourceforge.net" 
	<nbd-general@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	Wouter Verhelst <w@...r.be>
Subject: Re: [Nbd] [RFC 4/4] nbd: Add support for nbd as root device

Hi,

On Sat, Jan 31, 2015 at 03:43:16PM +0100, Andreas Klauer wrote:
> On Sat, Jan 31, 2015 at 08:52:18AM -0500, Paul Clements wrote:
> >    The pid is also used to break a hung connection. See nbd_xmit_timeout.
> 
> I'm using the pid to find the first free NBD device...
> 
> If it's going away I guess I'll have to stick to /proc/partitions...?
> Although last time I tried, it did not work too well.

This was just an idea I am thinking about.
If it is deprecated, it would still be around for a while. And my first
idea was to replace it with other information that are not internal,
like 'connected' which would be a boolean type.

> 
> (discussion on the NBD list, March 2014, "How to find a free NBD device")

Yes some better non-racy way to find a free nbd would be good.

Best regards,

Markus

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