linux-kernel - Re: Versioning file system

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Message-ID: <OF35839FC7.229AE944-ON882572FF.007F2DF8-882572FF.00819E1C@us.ibm.com>
Date:	Tue, 19 Jun 2007 16:35:50 -0700
From:	Bryan Henderson <hbryan@...ibm.com>
To:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
Cc:	akpm@...ux-foundation.org, alan <alan@...eserver.org>,
	Chris Snook <csnook@...hat.com>, hpa@...or.com,
	Jack Stone <jack@...keye.stone.uk.eu.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk
Subject: Re: Versioning file system

>We don't need a new special character for every 
>>  new feature.  We've got one, and it's flexible enough to do what you 
want, 
>> as proven by NetApp's extremely successful implementation.

I don't know NetApp's implementation, but I assume it is more than just a 
choice of special character.  If you merely start the directory name with 
a dot, you don't fool anyone but 'ls' and shell wildcard expansion.  (And 
for some enlightened people like me, you don't even fool ls, because we 
use the --almost-all option to show the dot files by default, having been 
burned too many times by invisible files).

I assume NetApp flags the directory specially so that a POSIX directory 
read doesn't get it.  I've seen that done elsewhere.

The same thing, by the way, is possible with Jack's filename:version idea, 
and I assumed that's what he had in mind.  Not that that makes it all OK.

--
Bryan Henderson                     IBM Almaden Research Center
San Jose CA                         Filesystems

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