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Date:      Sat, 2 Sep 2000 13:02:49 +0530 (IST)
From:      Rakhesh Sasidharan <rakhesh@cse.iitd.ernet.in>
To:        Marc van Woerkom <marc.vanwoerkom@science-factory.com>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: (newer ?) Ext2fs problem in FreeBSD-3.4
Message-ID:  <Pine.LNX.4.10.10009021256080.1853-100000@basant.cse.iitd.ernet.in>
In-Reply-To: <20000829135020.7C4E31E5B@nil.science-factory.com>

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On Tue, 29 Aug 2000, Marc van Woerkom wrote:

> > I have FreeBSD and Linux on the same machine.
> 
> Me too. And Windows 2000.

Actually, I have Net and OpenBSD's too.  I had borrowed a Win2k CD, but
that had some problems, and so I dumped it.

> 
> 
> > The whole of Linux is in an
> > extended partition, and it was only recently that I figured out one could
> > access them using wd0s5 (in my case) and upwards.
> 
> Right now I use a FAT32 partition for sharing information among the three OSs
> This solution sucks, because of the missing access control to that partition.
> On the other hand is has not caused me any problems so far.

You bet! :)

> 
> If we look at sharing a partition just between Linux and FreeBSD, we
> have can use a native format from either side:
> 
> 1. use ext2fs for the sharing partiion, no problems from Linux, 
>    perhaps problems from FreeBSD, because the ext2fs fs driver
>    in the FreeBSD kernel might be buggy 
> 
> 2. use FreeBSD's UFS format for the sharing partition, no
>    problems from FreeBSD, perhaps problems from the UFS driver
>    in the Linux kernel.
> 
> You tried 1., I am trying 2. these days.

There is a solution for 1:  Don't use the newer `mk2efs' utility.  This is
what I did:  I needed to install RedHat 6.2 (that has a newer kernel which
reads disklabels properly).  I began with the RedHat 5.2 installation CD,
made partitions, made an ext2fs file-system, and then began off with
RedHat 6.2 installation (and told it NOT to format my partitions).  Now,
FreeBSD-3.4 reads from ext2fs fine.  (Phew!)

I suppose the problem has been solved with FreeBSD-4.1 etc.

I use Linux to mount my UFS partitions.  But, they get mounted ro.  I
configured the kernel to allow (experimental) rw access to UFS, and
occasionally use it.  I didn't want to risk losing my data.  What has your
experiences been with rw access to UFS ?

Rakhesh



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