linux-kernel - Re: Versioning file system

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]

Date:	Sat, 16 Jun 2007 20:18:39 -0600
From:	"Jeffrey V. Merkey" <jmerkey@...fmountaingroup.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Jan Harkes <jaharkes@...cmu.edu>,
	Jack Stone <jack@...keye.stone.uk.eu.org>,
	alan <alan@...eserver.org>, hpa@...or.com,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org, viro@...iv.linux.org.uk
Subject: Re: Versioning file system

Alan Cox wrote:

>>  (Vax/VMS System Software Handbook)
>>  (TOPS-20 User's Manual)
>>    
>>
>
>Also Files/11
>
>Basic versioning goes back to at least ITS
>
>Not sure how old doing file versioning and hiding it away with a tool to
>go rescue the stuff you blew away by mistake is, but Novell Netware 3
>certainly did a good job on that one
>  
>

The trick in the NetWare 3 model was to segregate the directory entries 
onto special reserved
4K directory blocks (128 byte dir records). When it came time to purge 
storage after the file system filled, an entire 4K block and all
chains was deleted during block allocation for new files. The dir blocks 
were ordered by date -- oldest ones got purged
first. The model worked very well until compression was added to the 
filesystem, then it started getting complex.

I would be willing to help instrument the NetWare 3 model in this 
proposal on ext3, since this is a basic versioning model and
would provide coverage for 99% of the folks needing this capability. I 
am available for questions.

Jeff

>-
>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/
>
>  
>

-
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/