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Date: Fri, 5 Dec 2003 14:47:56 -0500
Message-Id: <200312051947.hB5Jlupp030878@agora.fsl.cs.sunysb.edu>
From: Erez Zadok <ezk@cs.sunysb.edu>
To: Matthew Wilcox <willy@debian.org>
Cc: Erez Zadok <ezk@cs.sunysb.edu>,
       =?iso-8859-1?Q?J=F6rn?= Engel <joern@wohnheim.fh-wedel.de>,
       Phillip Lougher <phillip@lougher.demon.co.uk>,
       Kallol Biswas <kbiswas@neoscale.com>, linux-kernel@vger.kernel.org,
       "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: Re: partially encrypted filesystem 
In-reply-to: Your message of "Fri, 05 Dec 2003 19:14:47 GMT."
             <20031205191447.GC29469@parcelfarce.linux.theplanet.co.uk> 
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Thanks for the info, Matthew.  Yes, clearly a scheme that keeps some "holes"
in compressed files can help; one of our ideas was to leave sparse holes
every N blocks, exactly for this kind of expansion, and to update the index
file's format to record where the spaces are (so we can efficiently
calculate how many holes we need to consume upon a new write).

Cheers,
Erez.