From owner-freebsd-questions@FreeBSD.ORG Fri Sep 24 19:48:03 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 ED8EC106564A for ; Fri, 24 Sep 2010 19:48:03 +0000 (UTC) (envelope-from frank@esperance-linux.co.uk) Received: from asmtp3.iomartmail.com (asmtp3.iomartmail.com [62.128.201.159]) by mx1.freebsd.org (Postfix) with ESMTP id 80B798FC1B for ; Fri, 24 Sep 2010 19:48:02 +0000 (UTC) Received: from asmtp3.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id o8OJm1kH002446; Fri, 24 Sep 2010 20:48:01 +0100 Received: from orange.esperance-linux.co.uk (80-45-152-196.static.dsl.as9105.com [80.45.152.196]) (authenticated bits=0) by asmtp3.iomartmail.com (8.13.8/8.13.8) with ESMTP id o8OJm0Jm002440; Fri, 24 Sep 2010 20:48:00 +0100 Received: by orange.esperance-linux.co.uk (Postfix, from userid 1001) id 5B99C33C3D; Fri, 24 Sep 2010 20:48:00 +0100 (BST) Date: Fri, 24 Sep 2010 20:48:00 +0100 From: Frank Shute To: Leif Walsh Message-ID: <20100924194800.GA18130@orange.esperance-linux.co.uk> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i X-Face: *}~{PHnDTzvXPe'wl_-f%!@+r5; VLhb':*DsX%wEOPg\fDrXWQJf|2\,92"DdS%63t*BHDyQ|OWo@Gfjcd72eaN!4%NE{0]p)ihQ1MyFNtWL X-Operating-System: FreeBSD 8.1-RELEASE amd64 X-Organisation: 'shute.org.uk' Cc: freebsd-questions@freebsd.org Subject: Re: Linux filesystems accessible from FreeBSD 8-stable? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Frank Shute List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 24 Sep 2010 19:48:04 -0000 On Thu, Sep 23, 2010 at 01:59:40PM -0400, Leif Walsh wrote: > > I can't seem to get a definitive answer on this from the internet, > there's a lot of conflicting information. > > I have some data drives formatted with ext4, which I'd like to access > from freebsd, preferably without totally reformatting because I don't > have much temp space for copying. Read-only would be fine, read-write > would be much preferred. > > Is this possible? Am I missing the big "ext4 drivers in > freebsd/fuse/something" sign? Does anyone happen to know if it's > possible to migrate an ext4 drive back to ext3, which it seems I can > access from bsd if I let it pretend the journal doesn't exist? > Wikipedia seems to think you're right in thinking you can migrate (or mount only?) an ext4 as ext3: http://en.wikipedia.org/wiki/Ext4 AFAIK and I stand to be corrected, in FreeBSD you mount ext3 as ext2. Whether you can mount ext4 as ext2; I don't know and I can't test. But it looks like you can't: http://forums.freebsd.org/archive/index.php/t-3377.html and this Status report suggests support is being written: http://www.freebsd.org/news/status/report-2009-04-2009-09.html You might wan't to drop the guy who was hoping to do it (Aditya Sarawgi) an email. ext3 can be read and written to on FreeBSD but the journal becomes out of date which is corrected when you boot up Linux and mount the filesystems as ext3. Regards, -- Frank Contact info: http://www.shute.org.uk/misc/contact.html