linux-ext4 - Re: sparsify - utility to punch out blocks of 0s in a file

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <201202050933.q159XQpB026380@helium.internal.tigress.co.uk>
Date:	Sun, 05 Feb 2012 09:33:26 +0000
From:	Ron Yorston <rmy@...ress.co.uk>
To:	xfs@....sgi.com, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: sparsify - utility to punch out blocks of 0s in a file

Eric Sandeen wrote:

>Now that ext4, xfs, & ocfs2 can support punch hole, a tool to
>"re-sparsify" a file by punching out ranges of 0s might be in order.
>
>I'll see if util-linux wants it after it gets beat into shape.
>(or did a tool like this already exist and I missed it?)

Way ahead of you.  I wrote my sparsify utility for ext2 in 2004:

   http://intgat.tigress.co.uk/rmy/uml/sparsify.html

It's mostly of historical interest now, I suppose.  The sparsify utility
doesn't work on ext4 and I long since gave up maintaining the kernel
patch.  I still use the zerofree utility, though.

It would be nice to have a modern version of sparsify.  I'll try it out.

Ron
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html