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Date:	Mon, 25 Apr 2011 11:10:43 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Zhao Cai <zhaocai@...com>
CC:	Amir Goldstein <amir73il@...il.com>,
	ext4 mailing list <linux-ext4@...r.kernel.org>
Subject: Re: ext4_put_super is not called during system shutdown or restart

On 4/25/11 11:05 AM, Zhao Cai wrote:
> Sorry, my mistake. It happens only when ext4 is the root file system. 

that makes sense, since root is never actually unmounted; it just goes to readonly.

-Eric

> -Zhao
> 
> 
> On Apr 25, 2011, at 11:02 AM, Amir Goldstein wrote:
> 
>> On Monday, April 25, 2011, Eric Sandeen <sandeen@...hat.com> wrote:
>>> On 4/24/11 11:12 PM, 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.
>>>
>>> Even for a non-root filesystem?
>>>
>>> I don't know if ubuntu does anything special, but I would expect that during a system shutdown, non-root filesystems would be unmounted, and you'd get put_super called.  Unless the fs is busy and it can't be unmounted for some reason...
>>
>> This strangely reminds me of my report that xfstests sometimes fails
>> to umount on Ubuntu 10.10.
>> But I could be just trying to hold on to the hope of somebody else
>> solving my problems...
>>
>>>
>>> -Eric
>>>
>>>> Thanks。
>>>>
>>>> -- All the best,
>>>>
>>>> Zhao Cai
>>>>
>>>>
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> 

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