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Date:	Mon, 25 Apr 2011 16:07:55 -0400
From:	Zhao Cai <zhaocai@...com>
To:	Eric Sandeen <sandeen@...hat.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

In that case, how to make sure all the jbd2 transactions are fininshed before reboot? is it ext4_freeze and jbd2_journal_flush?

Thanks.
--
All the best,

Zhao Cai


On Apr 25, 2011, at 12:12 PM, Zhao Cai wrote:

> On Apr 25, 2011, at 12:10 PM, Eric Sandeen wrote:
> 
>> 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
> 
> Thanks. That means it is designed to be like this!
> 
>>> -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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>>>>> 
>>> 
>> 
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