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