linux-kernel - Re: Starting a grad project that may change kernel VFS. Early research Re: Starting a grad project that may change kernel VFS. Early research

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] [day] [month] [year] [list]

Message-ID: <4A95282A.3020209@s5r6.in-berlin.de>
Date:	Wed, 26 Aug 2009 14:18:50 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Jeff Shanab <jshanab@...thlink.net>
CC:	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Starting a grad project that may change kernel VFS. Early 	research
 Re: Starting a grad project that may change kernel VFS. Early 	research

Jeff Shanab wrote:
> Rik van Riel wrote:
>> Hard links have been done like this in pretty much every
>> Unix filesystem since the 1970's.
[...]
> There is no real way to handle this becasue the two files look the same
> to the filesystem.

See above; it has been state of the art since the 70's.  With hardlinks
or symlinks, a graph which represents the FS happens to contain loops.
No rocket science involved.

[...]
> How would I display this information usefully to the user.

Certain file managers display the overall size and the size on disk.
The latter differs from the former due to
  - on-disk format overhead,
  - on-disk compression,
  - hardlinks and symlinks.
If the user copies the directory to another filesystem, the size on disk
will generally change.
-- 
Stefan Richter
-=====-==--= =--- ==-=-
http://arcgraph.de/sr/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/