linux-kernel - Re: 2.6.36 io bring the system to its knees

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Message-ID: <20101110142214.GB1447@ucw.cz>
Date:	Wed, 10 Nov 2010 15:22:14 +0100
From:	Pavel Machek <pavel@....cz>
To:	Dave Chinner <david@...morbit.com>
Cc:	Evgeniy Ivanov <lolkaantimat@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>, dave b <db.pub.mail@...il.com>,
	Sanjoy Mahajan <sanjoy@...n.edu>,
	Jesper Juhl <jj@...osbits.net>,
	Chris Mason <chris.mason@...cle.com>,
	Ingo Molnar <mingo@...e.hu>, Pekka Enberg <penberg@...nel.org>,
	Aidar Kultayev <the.aidar@...il.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>, Ted Ts'o <tytso@....edu>,
	Corrado Zoccolo <czoccolo@...il.com>,
	Shaohua Li <shaohua.li@...el.com>,
	Steven Barrett <damentz@...il.com>
Subject: Re: 2.6.36 io bring the system to its knees

Hi!

> > At least are there security issues?
> > Why do you say, that fs can be corrupted? Metadata is still
> > journalled, so only data might be corrupted, but FS should still be
> > consistent.
> 
> Data corruption is still a filesystem corruption.

As far as I understand, apps should not expect anything unless they
use fsync(). And fsync() still works in ext3...

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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