Linux filesystems accessible from FreeBSD 8-stable?

Aaron drizzt321 at
Fri Sep 24 20:13:56 UTC 2010

On Fri, Sep 24, 2010 at 12:21, Leif Walsh <leif.walsh at> wrote:
> On Fri, Sep 24, 2010 at 2:04 PM, krad <kraduk at> wrote:
>> Im not 100% sure  (probably about 60% actually) but cant you mount ext4 as
>> ext2? From what i vaguly remember there will be some limitations but its
>> worth having a look
>  # mount -t ext2fs /dev/ad4p1 /mnt
> mount: /dev/ad4p1 : Invalid argument
> Unless there's something I'm missing, nope.  ext3 works because the
> only difference between it and ext2 is the journal, I believe the
> on-disk format of ext4 is different (though maybe I'm wrong and the
> bsd drivers for ext2 just are too conservative?).
> --
> Cheers,
> Leif
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Doesn't look like you can mount an ext4 as ext2/3 if you have extents
enabled, which is probably enabled by default if you create a new


"Once you have enabled extents or created a journal on a former ext2
filesystem, it is an ext4 filesystem and cannot be reverted to ext2."

Under "Backward compatibility" header
"However, if the ext4 partition uses extents (a major new feature of
ext4), then the ability to mount the file system as ext3 is lost.


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