linux-ext4 - Re: Metadata_csum is still enabled after trying to disable it.

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Date:   Fri, 23 Nov 2018 16:25:06 +0100
From:   Jean-Christophe Guillain <jcguillain@...uans.com>
To:     <darrick.wong@...cle.com>
Cc:     <linux-ext4@...r.kernel.org>
Subject: Re: Metadata_csum is still enabled after trying to disable it.

----- On Nov 22, 2018, at 4:01 AM, Darrick J. Wong darrick.wong@...cle.com wrote:
>> * I check : metadata checksum looks like disabled
>>     root@...t# tune2fs -l /dev/my_vol tune2fs 1.43.4 (31-Jan-2017)
>>     Filesystem volume name:   <none>
>>     [...]
>>     Journal backup:           inode blocks
>> 
>> * I change filesystem UUID : It looks like metada checksum still is enabled
>>     root@...t# tune2fs -U random /dev/my_vol
>>     tune2fs 1.43.4 (31-Jan-2017)
>>     Setting UUID on a checksummed filesystem could take some time.
>>     Proceed anyway (or wait 5 seconds) ? (y,N) y
>> 
>> Is it a bug ?
> 
> Yes.

Should I open a bug in bugzilla ?

> 
>> How can I actually disable this parameter ?
> 
> I think you have to turn off the metadata_csum_seed feature, but tbh
> tune2fs really shouldn't pester about !metadata_csum,metadata_csum_seed
> filesystems...
> 

I actually tried that (!metadata_csum,!metadata_csum_seed) : tune2fs has still the same behaviour.
How does it detect that the filesystem is (it shouldn't be anymore), or was checksummed ?

> --D
> 
>> Best regards,
>> jC Guillain
>> 
>> 

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