linux-kernel - Re: [PATCH 05/24] Unionfs: Copyup Functionality

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Date:	Mon, 8 Jan 2007 13:29:47 -0800
From:	Andrew Morton <akpm@...l.org>
To:	"Josef 'Jeff' Sipek" <jsipek@...sunysb.edu>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	hch@...radead.org, viro@....linux.org.uk, torvalds@...l.org,
	mhalcrow@...ibm.com, David Quigley <dquigley@....cs.sunysb.edu>,
	Erez Zadok <ezk@...sunysb.edu>
Subject: Re: [PATCH 05/24] Unionfs: Copyup Functionality

On Sun,  7 Jan 2007 23:12:57 -0500
"Josef 'Jeff' Sipek" <jsipek@...sunysb.edu> wrote:

> From: Josef "Jeff" Sipek <jsipek@...sunysb.edu>
> 
> This patch contains the functions used to perform copyup operations in unionfs.

What is a copyup operation and why does it exist?

It seems to be copying the entire contents of certain files.  That's not a
thing I'd have expected to see in a union filesystem.  Explain it all,
please?  (Somewhere where the info will be retained for posterity - a
random email is good, but not sufficient...)
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