linux-kernel - Re: 2.6.29 -mm merge plans

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Message-ID: <20090108132455.GE2247@ucw.cz>
Date:	Thu, 8 Jan 2009 14:24:55 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Nick Piggin <npiggin@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.29 -mm merge plans

On Wed 2009-01-07 03:57:25, Andi Kleen wrote:
> > sys_sync B which is invoked *after* sys_sync caller A should not
> > return before A. If you didn't have a global lock, they'd tend to
> > block one another's pages anyway. I think it's OK.
> 
> It means that you cannot reboot because reboot does sync.
> What happens when the sync gets stuck somewhere on a really
> slow device?

And what do you propose? Silently corrupt data on the slow device?
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