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Date:      Tue, 10 Aug 1999 12:38:26 -0500
From:      Chris Csanady <ccsanady@scl.ameslab.gov>
To:        "Alton, Matthew" <Matthew.Alton@anheuser-busch.com>
Cc:        "'Hackers@FreeBSD.ORG'" <Hackers@FreeBSD.ORG>
Subject:   Re: BSD XFS Port & BSD VFS Rewrite
Message-ID:  <37B06392.1474E63A@scl.ameslab.gov>
References:  <0740CBD1D149D31193EB0008C7C56836EB8AFC@STLABCEXG012>

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"Alton, Matthew" wrote:
> 
> I am currently conducting a thorough study of the VFS subsystem
> in preparation for an all-out effort to port SGI's XFS filesystem to
> FreeBSD 4.x at such time as SGI gives up the code.  Matt Dillon
> has written in hackers- that the VFS subsystem is presently not
> well understood by any of the active kernel code contributers and
> that it will be rewritten later this year.  This is obviously of great
> concern to me in this port.  I greatly appreciate all assistance in
> answering the following questions:
> 
> 1)  What are the perceived problems with the current VFS?
> 2)  What options are available to us as remedies?
> 3)  To what extent will existing FS code require revision in order
>      to be useful after the rewrite?
> 4)  Will Chapters 6,7,8 & 9 of "The Design and Implementation of
>      the 4.4BSD Operating System" still pertain after the rewrite?
> 5)  How important are questions 3 & 4 in the design of the new
>      VFS?
> 
> I believe that the VFS is conceptually sound and that the existing
> semantics should be strictly retained in the new code.  Any new
> functionality should be added in the form of entirely new kernel
> routines and system calls, or possibly by such means as
> converting the existing routines to the vararg format &etc.
> 
> Does anyone know when SGI will release XFS?

I don't know, but I came across this at SGI:

	http://oss.sgi.com/projects/xfs/

It looks as though they plan to release it under the GPL. :(

Chris


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