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

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Message-id: <F4A9E9C5-21DE-44A9-AA83-285BF5279345@me.com>
Date:	Mon, 25 Apr 2011 12:12:07 -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 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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