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Date:      Tue, 24 Jul 2001 11:28:32 -0500
From:      Russell Cattelan <cattelan@thebarn.com>
To:        m p <sumirati@yahoo.de>
Cc:        freebsd-fs@FreeBSD.ORG
Subject:   Re: Porting a new filesystem to FreeBSD
Message-ID:  <3B5DA230.5070406@thebarn.com>
References:  <20010717082210.76404.qmail@web13303.mail.yahoo.com>

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If you really are willing to help port a FS to FreeBSD, you could
help with the XFS port. :-)

It is a bit stalled at the moment as I'm busy doing work that generates 
income,
but I do get a chance to bang on it once in a while ... hopefully I will
be able to mount a FS soon.


Note to quickly answer one of your questions, yes some modifications will
be need to the core kernel code to support pinning,  but I suspect is will
be very minor due to support for softupdates.

Ohh and porting a linux FS to BSD is much more difficult than porting
a IRIX FS to BSD, linux has a different IO layering concept than other 
unix systems.

m p wrote:

>Hi,
>
>let it be technical again.
>
>I wanted to do a little bit more research before
>bringing up the idea of porting the GPLed version of
>JFS to *BSD. But now is better than else.
>
>JFS would be a nice thing for
>mail/database/http/file-servers. I can not state "that
>filesystem is better than this". But a filesystem
>developed by a big company to use it with linux - why
>do we not port it?
>
>Things i wanted to research before starting it:
>1) Is there anybody doing it and needing help?
>2) What filesystem/booting-process/lvm-stuff is under
>development in -current?
>3) How do i have to modify the kernel to support JFS?
>(or modify the linux kernel wrapper)
>4) How do i kernel programming (if needed)?
>5) What _exactly_ is a filesystem?
>
>When these points are clear (worst case i have to do a
>research on all 5, best case only on point 1) i will
>start the project. 
>
>Is there any big step i missed during brainstorming?
>
>I've got a lot of time left, 300 km from home alone in
>a motel.
>
>Thanks for any hints
>
>Marc
>
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