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Date:	Wed, 13 Apr 2011 10:10:06 -0400
From:	Mark Lord <kernel@...savvy.com>
To:	Ted Ts'o <tytso@....edu>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-ext4@...r.kernel.org
Subject: Re: CONFIG_EXT4_USE_FOR_EXT23:  rootfs shows as ext2 instead of ext4

On 11-04-12 08:49 PM, Ted Ts'o wrote:
> On Tue, Apr 12, 2011 at 01:25:08PM -0400, Mark Lord wrote:
>> Ted et al.
>>
>> I've only just noticed this, so I have no idea how long it has been this way.
>>
>> When I build a kernel with CONFIG_EXT4_USE_FOR_EXT23=y and boot from it,
>> the ext4 root filesystem shows up as "ext2" mode, rather than "ext4".
>>
>> This looks very wrong to me, and quite dangerous.
> 
> It's a cosemtic bug, I agree, but I'm not sure why you consider it
> dangerous.

It is dangerous if it really has mounted an ext4 as ext2;
the on-disk formats are not 100% compatible.

I don't know what it is doing, so it looks quite dangerous.
Perhaps it really did mount as ext4 though, in which case not.

Thanks.
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