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Date:      Fri, 24 Sep 2004 15:53:24 -0000
From:      Darren Pilgrim <dmp@pantherdragon.org>
To:        dwbear75@gmail.com
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: Why is there no JFS?
Message-ID:  <3E4ADDDE.5040208@pantherdragon.org>
In-Reply-To: <005801c2d2eb$aa5fae60$1200a8c0@gsicomp.on.ca>
References:  <3E4A5B77.5080103@ant.uni-bremen.de> <3E4A863E.2030801@potentialtech.com> <3E4A8EF5.1070308@ant.uni-bremen.de> <3E4A9712.8030609@potentialtech.com> <3E4AA331.5040701@ant.uni-bremen.de> <3E4AA734.5040102@potentialtech.com> <045401c2d2db$f9d45c30$0a0aa8c0@dweebsoft.com> <20030212225631.GA10375@HAL9000.homeunix.com> <005801c2d2eb$aa5fae60$1200a8c0@gsicomp.on.ca>

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Matthew Emmerton wrote:
>>Thus spake Daxbert <daxbert_news@dweebsoft.com>:
>>
>>>The inspiration for this email was from a thread in
>>>-questions: "Re: fsck takes very long after crash/reset"
>>>
>>>Is anybody currently working on or does there exist
>>>a JFS for FreeBSD?
> 
> 
> Various people (including myself and Hiten Pandya) have done work to port
> the GPL'd JFS implementation, but there's one ugly problem -- the GPL.
> 
> We can make JFS into a kernel module (avoiding the static-link policy of the
> GPL), but then it can only (legally) be used on non-root filesystems, as the
> code to read the root filesystem must be statically linked into the kernel.
> This in itself makes JFS support somewhat pointless.

Not really.  A properly laid-out filesystem hierarchy will result in no 
writes to / (except for installworld/kernel).  That removes the problem 
that journalling addresses, and is probably why softupdates is disabled 
by default for /.  For large, active filesystems, journalling would be a 
big improvement when you had to run a foreground fsck.


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