Date: Sun, 27 Aug 2006 19:15:10 +0200
From: =?iso-8859-1?Q?J=F6rn?= Engel <joern@wohnheim.fh-wedel.de>
To: Al Boldi <a1426z@gawab.com>
Cc: Josef Sipek <jsipek@fsl.cs.sunysb.edu>,
       Eric Van Hensbergen <ericvh@gmail.com>, linux-fsdevel@vger.kernel.org,
       linux-kernel@vger.kernel.org
Subject: Re: [RFC] VFS: FS CoW using redirection
Message-ID: <20060827171510.GA3502@wohnheim.fh-wedel.de>
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On Sat, 26 August 2006 22:05:21 +0300, Al Boldi wrote:
> 
> So what was the rejecting theme?

I don't believe there was one.  Jan simply didn't push much, so noone
was forced to resist him.  And noone else needed union mount enough to
push Jan.

> > Or you can give Unionfs a try: http://www.unionfs.org
> 
> UnionFS is great, but it incurs additional overhead, as it lives below the 
> real VFS.  What could be really great, is to move some basic functionality 
> abstractions from UnionFS into VFS proper.

Welcome to Jan's work. :)

If you want to make this vision happen, one of the missing pieces is a
method for copyup, an in-kernel copying routine.  Unionfs needs is
just the same as Jan's patches do and in the past Linus didn't like my
approach of using sendfile for it.  You could take a stab at the
splice code and see how that can be used for copyup.

J?rn

-- 
Write programs that do one thing and do it well. Write programs to work
together. Write programs to handle text streams, because that is a
universal interface.
-- Doug MacIlroy
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