From: Andrew Morton <akpm@linux-foundation.org>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@elte.hu" <mingo@elte.hu>,
"greg@kroah.com" <greg@kroah.com>,
"Huang, Ying" <ying.huang@intel.com>,
Borislav Petkov <bp@alien8.de>,
David Miller <davem@davemloft.net>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Jim Keniston <jkenisto@linux.vnet.ibm.com>,
Kyungmin Park <kmpark@infradead.org>,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: [RFC] persistent store (version 2) (part 1 of 2)
Date: Thu, 2 Dec 2010 02:12:16 -0800 [thread overview]
Message-ID: <20101202021216.2d7c33f8.akpm@linux-foundation.org> (raw)
In-Reply-To: <987664A83D2D224EAE907B061CE93D530191F27E0E@orsmsx505.amr.corp.intel.com>
On Wed, 1 Dec 2010 22:00:12 -0800 "Luck, Tony" <tony.luck@intel.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.
next prev parent reply other threads:[~2010-12-02 10:14 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-01 0:20 [RFC] persistent store (version 2) (part 1 of 2) Luck, Tony
2010-12-01 0:58 ` Greg KH
2010-12-01 18:01 ` Luck, Tony
2010-12-01 22:10 ` Greg KH
2010-12-02 0:51 ` Andrew Morton
2010-12-02 6:00 ` Luck, Tony
2010-12-02 10:12 ` Andrew Morton [this message]
2010-12-02 16:19 ` Tony Luck
2010-12-02 18:45 ` Tony Luck
2010-12-02 18:45 ` Tony Luck
2010-12-02 8:26 ` Huang Ying
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