linux-kernel - Re: [PATCH 01/24] Unionfs: Documentation

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Message-Id: <20070108111852.ee156a90.akpm@osdl.org>
Date:	Mon, 8 Jan 2007 11:18:52 -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 01/24] Unionfs: Documentation

On Sun,  7 Jan 2007 23:12:53 -0500
"Josef 'Jeff' Sipek" <jsipek@...sunysb.edu> wrote:

> +Modifying a Unionfs branch directly, while the union is mounted, is
> +currently unsupported.

Does this mean that if I have /a/b/ and /c/d/ unionised under /mnt/union, I
am not allowed to alter anything under /a/b/ and /c/d/?  That I may only
alter stuff under /mnt/union?

If so, that sounds like a significant limitation.

> Any such change can cause Unionfs to oops, or stay
> silent and even RESULT IN DATA LOSS.

With a rather rough user interface ;)

Also, is it possible to add new branches to an existing union mount?  And
to take old ones away?
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