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Date:	Mon, 25 Apr 2011 14:23:09 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Zhao Cai <zhaocai@...com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: ext4_put_super is not called during system shutdown or restart

On Mon, Apr 25, 2011 at 12:12:02AM -0400, Zhao Cai wrote:
> I would appreciate if anyone can give me an answer. Is it designed
> to be like this?
> 
> Detailed situation: The system is ubuntu 11.04 installed in
> VMware. I notice that ext4_put_super() is called when I unmount a
> non-root ext4 partition. But it is not when I restart or shutdown
> the system.
> 

What happens on most Linux systems is that root file system gets
remounted read/only during the reboot/shutdown sequence, whil non-root
file systems are unmounted.  I haven't tried 11.04 so I can't tell you
what it is doing.  If it isn't umounting the non-root file systems, or
at least remounting the non-root file systems read/only, then
something is probably going wrong.  That's a question for the
distribution....

						- Ted
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