linux-kernel - Re: linux kernel without file system

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Message-ID: <20090114121823.GA32180@frolo.macqel>
Date:	Wed, 14 Jan 2009 13:18:23 +0100
From:	Philippe De Muyter <phdm@...qel.be>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Tomasz Chmielewski <mangoo@...g.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux kernel without file system

On Wed, Jan 14, 2009 at 12:59:49PM +0100, Arnd Bergmann wrote:
> On Wednesday 14 January 2009, Philippe De Muyter wrote:
> > Actually, I was thinking about reducing the footprint of my kernel by
> > removing all the fs-related system calls, so the problem is not where
> > the file-system is, but how to access (serial) devices without giving their
> > "/dev/..." name.
> 
> One thing that you can do is remove support for block devices in somewhat
> recent kernels, which gets you most of the way. File systems themselves
> are required for the majority of all system calls (anything that takes
> a file descriptor) and for the boot process.

file descriptor is actually an historical name, now too particular.

I would like to keep sockets and serial lines, for which the handle is a
"file descriptor", but not use any file.  So, of course I need to keep
write(), read(), poll(), socket() etc, but not open(), link(), mknod() and
everything that walks a directory tree.

Philippe
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