From owner-freebsd-questions@FreeBSD.ORG Fri Sep 24 20:13:56 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 69E34106566C for ; Fri, 24 Sep 2010 20:13:56 +0000 (UTC) (envelope-from drizzt321@gmail.com) Received: from mail-qw0-f54.google.com (mail-qw0-f54.google.com [209.85.216.54]) by mx1.freebsd.org (Postfix) with ESMTP id 22B918FC14 for ; Fri, 24 Sep 2010 20:13:55 +0000 (UTC) Received: by qwd6 with SMTP id 6so1746067qwd.13 for ; Fri, 24 Sep 2010 13:13:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:mime-version:received:in-reply-to :references:from:date:message-id:subject:to:content-type :content-transfer-encoding; bh=Z1GzGrJCM9XSb7DqbiiOljOrtK48yv4hpNuFSQBr9A8=; b=Xk7isGyoOOrbbPfqHcktWEEr5vuD9tcG1fQ8Byh6Yl6fp7WYcdND95E1+/jtH8UzBo n5dxpTzBKfzMJExUTH+bSDyjq9sEuq0B2zuCtk2JEgqdFUp8FbvMUjwXfyMEbiXHG55s 3423Bc0thAPfGdjnKLQhmBj7RXbYipoB4z94Q= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type:content-transfer-encoding; b=cgbOsBn2v5OB8NpcS0mvwsRXi4l0bGs0bPP+Od6oqHqQx3yLF66mKZxopiXfstEbms QUrFAnGOBeNoFDP+M0iWJM5LN5czgfPr0HwS3X5U0XBHwOtz6n+198EE+HXq3RtlCYAd aXw2Hs3xW/BYQgd91824wDUZZngSq862PQDF0= Received: by 10.229.222.6 with SMTP id ie6mr2976755qcb.28.1285359235172; Fri, 24 Sep 2010 13:13:55 -0700 (PDT) MIME-Version: 1.0 Received: by 10.229.236.85 with HTTP; Fri, 24 Sep 2010 13:13:34 -0700 (PDT) In-Reply-To: References: From: Aaron Date: Fri, 24 Sep 2010 13:13:34 -0700 Message-ID: To: freebsd-questions@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Subject: Re: Linux filesystems accessible from FreeBSD 8-stable? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 24 Sep 2010 20:13:56 -0000 On Fri, Sep 24, 2010 at 12:21, Leif Walsh wrote: > On Fri, Sep 24, 2010 at 2:04 PM, krad wrote: >> Im not 100% sure=A0 (probably about 60% actually) but cant you mount ext= 4 as >> ext2? From what i vaguly remember there will be some limitations but its >> worth having a look > > =A0# mount -t ext2fs /dev/ad4p1 /mnt > mount: /dev/ad4p1 : Invalid argument > > Unless there's something I'm missing, nope. =A0ext3 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 > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.o= rg" > 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 filesystem. >From https://ext4.wiki.kernel.org/index.php/Frequently_Asked_Questions#Can_= I_mount_existing_Ext3_as_Ext4.3F_And_vice_versa.3F_Similarly_from_Ext2_to_E= xt4_and_its_reverse.3F "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." >From http://en.wikipedia.org/wiki/Ext4#Features 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. --Aaron