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Date: Tue, 24 Jul 2001 10:30:12 +0100
From: Padraig Brady <Padraig@AnteFacto.com>
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To: Larry McVoy <lm@bitmover.com>
CC: "Albert D. Cahalan" <acahalan@cs.uml.edu>, linux-kernel@vger.kernel.org,
        linux-fsdev@vger.kernel.org
Subject: Re: Yet another linux filesytem: with version control
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Larry McVoy wrote:

> 
> Useful stuff would be the copy on write file system, that's good for SCM
> and other things

Ooh ooh! are there any filesystems @ present that support copy on write?
Seems like a very useful feature that would be relatively easy to 
implement (just
store a hash for each file in it's inode). With the ammount of duplicate 
files on my
system (see freshmeat.net/projects/fslint) it would be very useful. 
write() already
supports ENOSPC because of holes in files etc. There would be large 
overhead
though as the hash for a file would have to be generated on each write() 
? For a
"revision control" filesystem it would probably be more appropriate to 
work @ the
block level instead? Hmm snapFS be appropriate for this ?
http://uwsg.iu.edu/hypermail/linux/kernel/0103.0/0436.html
Sorry just thinking out load..

Padraig.

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