linux-kernel - Re: [RFC] rootmpfs

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Message-ID: <20130410134307.GB3672@sgi.com>
Date:	Wed, 10 Apr 2013 08:43:07 -0500
From:	Robin Holt <holt@....com>
To:	Rob Landley <rob@...dley.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC] rootmpfs

On Wed, Apr 03, 2013 at 07:30:08AM -0500, Rob Landley wrote:
> Attached is my quick and dirty hack to make rootfs be tmpfs when
> CONFIG_TMPFS is
> enabled. It can't be this easy or somebody would have done it in the

I don't see anything attached, but...

I have been running using tmpfs as my root for years.  I tweaked the
debian initrd scripts to mount a tmpfs filesystem, cpio recover a
compressed cpio image from the disk drive and then pivotroot.  Did not
require any kernel tweaks.

Thanks,
Robin

> _eight_years_
> since https://lkml.org/lkml/2006/7/31/145
> 
> Yes, it's got an #ifdef and out of place prototypes. Yes, it
> manually calls a module
> init function and compensates by making it reentrant. But it works,
> and when I
> "cat /dev/zero > filename" the filesystem fills _up_ instead of
> panicing the kernel.
> 
> So now that I've posted the error, would someone please tell me how
> I _should_ have done it?
> 
> Rob
> 
> P.S. If I actually change the filesystem type to a name other than
> "rootfs", it panics on the way up because various bits of the kernel
> are looking for that magic name. Sigh.
> 
> P.P.S. removing MS_NOUSER is actually intentional, there's a local
> cray patch that does the same thing because otherwise you can't
> --bind mount directories out of this filesystem, which is a thing
> they wanted to do.--
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