linux-kernel - Re: LogFS take four

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Message-ID: <20070604090507.GC14823@lazybastard.org>
Date:	Mon, 4 Jun 2007 11:05:07 +0200
From:	Jörn Engel <joern@...ybastard.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, akpm@...l.org,
	Sam Ravnborg <sam@...nborg.org>,
	John Stoffel <john@...ffel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Jamie Lokier <jamie@...reable.org>,
	Artem Bityutskiy <dedekind@...radead.org>,
	CaT <cat@....com.au>, Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	David Weinehall <tao@....umu.se>, Willy Tarreau <w@....eu>,
	Kyle Moffett <mrmacman_g4@....com>,
	Dongjun Shin <djshin90@...il.com>, Pavel Machek <pavel@....cz>,
	Bill Davidsen <davidsen@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Albert Cahalan <acahalan@...il.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Roland Dreier <rdreier@...co.com>,
	Ondrej Zajicek <santiago@...reenet.org>,
	Ulisses Furquim <ulissesf@...il.com>
Subject: Re: LogFS take four

On Mon, 4 June 2007 00:18:21 +0200, Arnd Bergmann wrote:
> On Sunday 03 June 2007, Jörn Engel wrote:
> 
> > Unchanged:
> > o error handling
> > 
> ...
> > Won't happen (unless I get convinced to do otherwise):
> > o Change LOGFS_BUG() and LOGFS_BUG_ON() to inline functions
> >   These are macros for very much the same reasons BUG() and BUG_ON() are.
> 
> I wonder how many of your LOGFS_BUG{,_ON} still remain after the
> error handling is in place to deal with broken file system contents.
> Ideally, I'd say the current LOGFS_BUG() should be replaced with
> a function that prints about the kind of error it has hit (rate-limited),
> potentially calls logfs_crash_dump(), and remounts the medium read-only,
> but _not_ call BUG().

That sounds fairly useful, actually.  Do a WARN_ON(), call
logfs_crash_dump(), remount read-only and finished.  Rate-limiting might
be unnecessary as the read-only thing already limits the rate to 1.

I like the idea.

Jörn

-- 
Fools ignore complexity.  Pragmatists suffer it.
Some can avoid it.  Geniuses remove it.
-- Perlis's Programming Proverb #58, SIGPLAN Notices, Sept.  1982
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