linux-kernel - Re: [PATCH] Allow SysRq emergency sync to thaw frozen filesystems

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Message-ID: <16406.1232119029@turing-police.cc.vt.edu>
Date:	Fri, 16 Jan 2009 10:17:09 -0500
From:	Valdis.Kletnieks@...edu
To:	Pavel Machek <pavel@...e.cz>
Cc:	Eric Sandeen <sandeen@...hat.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Takashi Sato <t-sato@...jp.nec.com>
Subject: Re: [PATCH] Allow SysRq emergency sync to thaw frozen filesystems

On Fri, 16 Jan 2009 09:48:28 +0100, Pavel Machek said:

> Emergency Sync should not do this. Invent another key.
> 
> ...because otherwise, if you hit emergency sync but the system is
> still alive and relies on filesystem freezing, bad stuff will happen.

Under what conditions would a system be alive and relying on freezing,
*and* an emergency thaw would be worse than whatever reason you're doing
an emergency sync?

Hmm.. guess you *could* get into trouble if you tried to do a Sysrq-[not-s]
and hit the wrong key - but you have the same danger if you have *any*
sysrq- invoking an emergency_thaw and hit it by accident...

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