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Message-Id: <200708020724.40623.philipp.marek@bmlv.gv.at>
Date:	Thu, 2 Aug 2007 07:24:39 +0200
From:	"Ph. Marek" <philipp.marek@...v.gv.at>
To:	Josef Sipek <jsipek@....cs.sunysb.edu>
Cc:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>,
	Jan Blunck <jblunck@...e.de>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>, hch@...radead.org
Subject: Re: [RFC 12/26] ext2 white-out support

On Mittwoch, 1. August 2007, Josef Sipek wrote:
> Alright not the greatest of examples, there is something to be said about
> symmetry, so...let me try again :)
...
> Oops! There's a whiteout in /b that hides the directory in /c -- rename(2)
> shouldn't make directory subtrees disappear.
>
> There are two ways to solve this:
>
> 1) "cp -r" the entire subtree ...
>
> 2) Don't store whiteouts within branches ...
Sorry for making uninformed guesses, but if there are already special nodes 
(whiteout), why not extending them to some more general format - specifying a 
(source, destination) pair at the topmost level?
- A delete is a (source, NULL) pair
- A rename is a (source, destination) pair, which causes lookups on source to
  use the string destination in the lower branches.


Would that work?


Regards,

Phil

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