linux-kernel - Re: [Patch 18/18] include/linux/Kbuild

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Date:	Thu, 9 Aug 2007 03:39:06 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	J??rn Engel <joern@...fs.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, akpm@...l.org,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Patch 18/18] include/linux/Kbuild

On Thu, Aug 09, 2007 at 04:32:17AM +0200, J??rn Engel wrote:
> On Thu, 9 August 2007 01:19:13 +0100, Christoph Hellwig wrote:
> > On Wed, Aug 08, 2007 at 06:24:47PM +0200, J??rn Engel wrote:
> > > --- linux-2.6.21logfs/include/linux/Kbuild~logfs	2007-08-08 02:57:37.000000000 +0200
> > > +++ linux-2.6.21logfs/include/linux/Kbuild	2007-08-08 02:57:37.000000000 +0200
> > > @@ -101,6 +101,7 @@ header-y += jffs2.h
> > >  header-y += keyctl.h
> > >  header-y += limits.h
> > >  header-y += lock_dlm_plock.h
> > > +header-y += logfs.h
> > 
> > That file doesn't define any kind of user<->kernel interface and thus should
> > not be exported.
> 
> mklogfs needs the header.  Does that not qualify?

No.  We been through this example (filesystem layouts) a few times.
It's of course not a kernel interface, and sharing it actually is harmfull,
because it means you can't change the structure layout for your filesystem
definition anymore, which unlike an actual ondisk change happens very
frequently, e.g. when introducing new unions keyed off a feature flag,
or similar things.  So please ship a copy with your userspace tools
package.
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