linux-kernel - Re: [RFC] VFS: FS CoW using redirection

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Message-ID: <20060827171510.GA3502@wohnheim.fh-wedel.de>
Date:	Sun, 27 Aug 2006 19:15:10 +0200
From:	Jörn Engel <joern@...nheim.fh-wedel.de>
To:	Al Boldi <a1426z@...ab.com>
Cc:	Josef Sipek <jsipek@....cs.sunysb.edu>,
	Eric Van Hensbergen <ericvh@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] VFS: FS CoW using redirection

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.

Jörn

-- 
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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