linux-ext4 - Re: ext4_put_super is not called during system shutdown or restart

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Message-id: <D9710D79-4BC6-485C-865B-11C445D47C06@me.com>
Date:	Mon, 25 Apr 2011 16:43:01 -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

On Apr 25, 2011, at 4:18 PM, Eric Sandeen wrote:

> On 4/25/11 3:07 PM, Zhao Cai wrote:
>> In that case, how to make sure all the jbd2 transactions are fininshed before reboot? is it ext4_freeze and jbd2_journal_flush?
> 
> the remount readonly path should do this, I think.
> 
> ext4_remount
> 	ext4_mark_recovery_complete
> 		jbd2_journal_lock_updates
> 		jbd2_journal_flush
> 
> -Eric
>> 
Thanks, Eric. I appreciate your very prompt help. That clarify my question.

-Zhao

>> 
>> 
>> 
>> 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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