linux-ext4 - Re: Difference in jbd2 behavior between CentOS and Ubuntu while unmounting

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Message-ID: <782fe069-c14f-4bae-609e-bbad554cb657@redhat.com>
Date:	Tue, 17 May 2016 21:41:07 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Kamran Khan <krkhan@...pirated.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Difference in jbd2 behavior between CentOS and Ubuntu while
 unmounting

On 5/17/16 9:35 PM, Kamran Khan wrote:
> Yup, the kernel versions are drastically different. It's 3.10 vs 4.2.
> 
> The problem on 3.10 though is, while jbd2 holds on to the unmounted
> device I cannot even rmmod jbd2 or ext4 *even if no other ext
> filesystems are mounted*. That lock makes it all but impossible to do
> anything with the block device.

You may as well try Centos7.2, at least, there are 50+ updates to
jbd2 & ext4 since 7.1.  If it still persists we can dig further.

-Eric

> On Tue, May 17, 2016 at 7:17 PM, Eric Sandeen <sandeen@...hat.com> wrote:
>> On 5/17/16 7:46 PM, Kamran Khan wrote:
>>> I'm trying to understand the difference in jbd2 behavior across Ubuntu
>>> 14.04 and Centos 7.1. Will appreciate any help.
>>
>> For starters, what kernel versions are those?  (I know what centos
>> is, "3.10.0" with updates, which I can check out, but I have no idea
>> what might be in the Ubuntu distro)
>>
>> -Eric
> 
> 
> 

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