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Date: Wed, 13 Mar 2002 08:26:47 -0800
From: Larry McVoy <lm@bitmover.com>
To: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>,
        Hans Reiser <reiser@namesys.com>, James Antill <james@and.org>,
        Larry McVoy <lm@bitmover.com>, Tom Lord <lord@regexps.com>,
        jaharkes@cs.cmu.edu,
        Linux Kernel Development <linux-kernel@vger.kernel.org>
Subject: Re: linux-2.5.4-pre1 - bitkeeper testing
Message-ID: <20020313082647.Y23966@work.bitmover.com>
Mail-Followup-To: Larry McVoy <lm@work.bitmover.com>,
	Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>,
	Hans Reiser <reiser@namesys.com>, James Antill <james@and.org>,
	Larry McVoy <lm@bitmover.com>, Tom Lord <lord@regexps.com>,
	jaharkes@cs.cmu.edu,
	Linux Kernel Development <linux-kernel@vger.kernel.org>
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In-Reply-To: <20020313143720.GA32244@pimlott.ne.mediaone.net>; from andrew@pimlott.ne.mediaone.net on Wed, Mar 13, 2002 at 09:37:20AM -0500
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On Wed, Mar 13, 2002 at 09:37:20AM -0500, Andrew Pimlott wrote:
> On Wed, Mar 13, 2002 at 10:39:28AM +0100, Geert Uytterhoeven wrote:
> > On Tue, 12 Mar 2002, Andrew Pimlott wrote:
> > > This is misleading--Clearcase stores versions on top a normal
> > > filesystem (like most other RCS's), and all manipulation is entirely
> >                                                               ^^^^^^^^
> > > in user-space (over the network to server processes).  There only
> >   ^^^^^^^^^^^^^
> > > filesystem magic is that there are directories you cannot list (plus
> > > permission semantics are a little funny).
> > 
> > So what's that ClearCase file system driver doing in kernel space?
> 
> Just providing a convenient view on the repository.  The only write
> operation you can do through the filesystem is write to the checked
> out version.  Checkin, checkout, branch, label, create new
> file/directory, rename, link, chmod, etc are all user-space.
> 
> Also, you can use ClearCase without the filesystem (snapshot view)
> and get all the same functionality.

Are you sure about that?  Snapshots are just the cleartext files.  The
set of operations you can do with a disconnected snapshot is extremely
limited, last I checked all you could do was edit the files.
-- 
---
Larry McVoy            	 lm at bitmover.com           http://www.bitmover.com/lm 
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