From: Jelle Foks <jelle@frontierd-us.com>
To: Denis RICHARD <dri@sxb.bsf.alcatel.fr>
Cc: linux-kernel@vger.kernel.org
Subject: Re: New version of e2compr for 2.4.16 kernel.
Date: Thu, 20 Dec 2001 17:25:07 -0500 [thread overview]
Message-ID: <3C226543.2010801@frontierd-us.com> (raw)
In-Reply-To: <3C2098D7.4228B2A5@sxb.bsf.alcatel.fr>
Denis RICHARD wrote:
>Hi,
>
> We have developped a new version of the e2compr package for the 2.4.16 kernel.
>
Nice. Since ext3fs is based on ext2fs, will that work with ext3fs too?
cya,
Jelle.
>
>It is based on the e2compr-0.4.39 patch provided by Peter Moulder
>for 2.2.18 kernel (http://cvs.bofh.asn.au/e2compr/).
> It is full compatible with previous version.
>
> We have introduced the structure of "cluster of pages", as there was the structure
>of "cluster of blocks" in preceding version. The compression unit is the cluster of
>pages.
>
> The implementation is similar with the 2.2 version. If the page needed is not present
>in memory, the cluster of pages including this one is decompressed.
> But in the 2.4 kernel the pages and the blocks have common area for the data.
>If a block is read from the device, the corresponding page is also modified.
>Then to decompress a cluster we should not read the blocks in the already used pages (decompressed)
>of the cluster. These pages can have been modified or can be used by another process (mapping).
>If a page is UPTODATE, a new one is allocated to decompress the cluster, and is freed after that.
>
> It has only been tested on i386 architecture, so be careful if you want to try it
>on other architecture, and especially if pages are large and can belong to two different
>clusters.
>
> For more informations, see the README files in Documentation/filesystems directory.
>
> If someone is interested by the patch, we will mail it.
>
> Feel free to contat us if you have some questions.
>
> Have fun.
>
> Pierre PEIFFER, Denis RICHARD .
>
>PS : We have also adjusted the e2fsprogs patch for the last version (1.25).
>
>--
>-----------------------------\--------------------------\
>Denis RICHARD \ ALCATEL Business Systems \
>mailto:dri@sxb.bsf.alcatel.fr / Tel: +33(0)3 90 67 69 36 /
>-----------------------------/--------------------------/
>
>
>
>-
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next prev parent reply other threads:[~2001-12-20 22:25 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-19 13:40 New version of e2compr for 2.4.16 kernel Denis RICHARD
2001-12-20 22:25 ` Jelle Foks [this message]
2002-01-04 17:53 ` Stephen C. Tweedie
-- strict thread matches above, loose matches on Subject: below --
2003-01-02 16:03 François Boisson
2003-01-02 15:09 ` New " Padraig Brady
2003-01-05 21:43 ` François Boisson
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