linux-kernel - Re: [RFC] persistent store (version 2) (part 1 of 2)

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Message-Id: <20101202021216.2d7c33f8.akpm@linux-foundation.org>
Date:	Thu, 2 Dec 2010 02:12:16 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...e.hu" <mingo@...e.hu>, "greg@...ah.com" <greg@...ah.com>,
	"Huang, Ying" <ying.huang@...el.com>,
	Borislav Petkov <bp@...en8.de>,
	David Miller <davem@...emloft.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Kyungmin Park <kmpark@...radead.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [RFC] persistent store (version 2) (part 1 of 2)

On Wed, 1 Dec 2010 22:00:12 -0800 "Luck, Tony" <tony.luck@...el.com> wrote:

> > filenames refer to files!  And lo, that's what we have here.  A
> > filesystem!  The files are created by the kernel and are read and
> > unlinked by userspace.
> >
> > So why not implement this whole thing as a proper filesystem?
> ...
> > Wait.  It *is* a filesystem.
> ...
> > So why can't I remove these "records" with rm?
> 
> Because I tried to use /sys for this and couldn't find a
> way to get notified about "unlink".  Alan Cox called this
> bit "daft" in v1 (and I agreed with him). Peter Anvin gave
> me some pointers on how easy this would be to do as a real
> filesystem ... so v3 will be out in a little while with
> this insanity removed.

OK.  Yes, the correct answer is usually "create a new filesystem
driver" ;)

<greps>

gad, there are over 200 register_filesystem() callsites.

One thing which does leap out of the v2 implementation is the hardwired
assumption that there is one store kernel-wide.  I suppose that's OK as
a version-1 implementation detail thing, but we should avoid hardwiring
that assumption into the presentation of v1's userspace interfaces.

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