linux-kernel - Re: [PATCH] add blockconsole version 1.1

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Message-ID: <20120713211440.GB10180@liondog.tnic>
Date:	Fri, 13 Jul 2012 23:14:40 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Jörn Engel <joern@...fs.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Jeff Moyer <jmoyer@...hat.com>,
	Steve Hodgson <steve@...estorage.com>
Subject: Re: [PATCH] add blockconsole version 1.1

On Fri, Jul 13, 2012 at 12:20:09PM -0400, Jörn Engel wrote:
> > > Logging to partitions is not supported.
> > 
> > That could be useful though. We have a setup here where we create a
> > partition on the block device and install the OS there for testing
> > purposes while leaving room on the device after it for other OS installs
> > and other people to test stuff.
> > 
> > If blockconsole could log to partitions, one could create an additional
> > small partition exactly for such logs.
> > 
> > I don't know how much work adding logging to partitions is though.
> 
> The actual logging shouldn't care one bit.  But abusing the
> partitioning code to detect a blockconsole device would no longer
> work, so some alternative for that is needed.
> 
> What I like about abusing the partitioning code is that blockconsole
> just works, without any command line parameters or other setup, either
> on boot or by pluggin in a new device.  And because our particular use
> case is a dedicated usb stick, we don't mind the drawbacks much.

Ok, actually using a dedicated usb stick obviates the need to log to
partitions - el cheapo usb sticks are ubiquitous. And I didn't realize
the usb stick use case when talking about the partitions example above
so forget what I said, logging to a dedicated usb stick is the easiest.

You probably could mention this in the docs as the most natural use case
for blockconsole if you haven't done so.

[ … ]

> Thanks!  The patch below should do that - provided my brain slightly
> less broken than it must have been yesterday.

Thanks, will run it next week and let you know.

-- 
Regards/Gruss,
    Boris.
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