linux-ext4 - Re: EXT4-fs (mmcblk0p1): couldn't mount as ext3 due to feature incompatibilities

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Date:   Fri, 2 Mar 2018 15:55:03 +0000
From:   Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
To:     "lczerner@...hat.com" <lczerner@...hat.com>,
        "sandeen@...hat.com" <sandeen@...hat.com>
CC:     "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: EXT4-fs (mmcblk0p1): couldn't mount as ext3 due to feature
 incompatibilities

On Fri, 2018-03-02 at 16:43 +0100, Joakim Tjernlund wrote:
> On Fri, 2018-03-02 at 09:34 -0600, Eric Sandeen wrote:
> > CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
> > 
> > 
> > On 3/2/18 9:20 AM, Joakim Tjernlund wrote:
> > > On Fri, 2018-03-02 at 08:42 -0600, Eric Sandeen wrote:
> > 
> > ...
> > 
> > > > ext3 is always going to print a message if mount fails for this reason; it
> > > > has no idea that ext4 will be tried next, all it knows is that it was told
> > > > to mount, and it can't.
> > > 
> > > But I don't hav ext3, only ext4 in kernel:
> > > # CONFIG_EXT2_FS is not set
> > > # CONFIG_EXT3_FS is not set
> > > CONFIG_EXT4_FS=y
> > > 
> > > ext4 know's ext3 and complains as is today. In this config one should not have to see
> > > this error.
> > 
> > ext4.ko was told to mount your disk /as an ext3 filesystem/, and ext4.ko issued an
> > error saying that was not possible.  It is doing the right thing.
> 
> hmm, so you think there is a bug in my system ?
> It works for you(no error msg) if you specify auto type in fstab?

It seems to that ext4/3/2 is one of few(only?) FS:es that
report an error during mount -t auto probing and that is why I see this.

 Jocke