linux-kernel - Re: Versioning file system

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Message-ID: <18040.17518.714866.200801@stoffel.org>
Date:	Tue, 19 Jun 2007 17:02:38 -0400
From:	"John Stoffel" <john@...ffel.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	John Stoffel <john@...ffel.org>,
	Jack Stone <jack@...keye.stone.uk.eu.org>,
	Chris Snook <csnook@...hat.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, akpm@...ux-foundation.org,
	viro@...iv.linux.org.uk, "H. Peter Anvin" <hpa@...or.com>,
	alan <alan@...eserver.org>
Subject: Re: Versioning file system

Matthew> On Tue, Jun 19, 2007 at 04:34:42PM -0400, John Stoffel wrote:
>> >>>>> "Jack" == Jack Stone <jack@...keye.stone.uk.eu.org> writes:
>> 
Jack> The whole idea of the file system is that it wouldn't return the
Jack> file in the file listing. The user would have to know that the
Jack> file system was versioning to access the older versions as they
Jack> would explicitly have to request them.
>> 
>> So tell me what happens when I do:
>> 
>> touch foo:121212121212

Matthew> You create a new file called 'foo:121212121212'.  If you then
Matthew> modify it, you could access the old version as
Matthew> foo:121212121212:0.

Sure, I knew that, I was trying to push the boundaries a bit here with
magic version filenaming conventions to show that it won't scale.
Heck, trying to figure out what:

	touch foo::::::::::::::::::::::

does would be interesting, and would the filesystem parsing code
handle that case?  

Matthew> (The .snapshot directory makes more sense than magic names,
Matthew> since you can see what versions of a file are available
Matthew> without a special tool).

I agree 100%, it's a much better solution, though it has it's own
problems, esp over NFS and getting back to your original parent
directory properly can be painful.

John

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