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Date: Fri, 19 Apr 2002 00:12:08 -0400
From: Mark Mielke <mark@mark.mielke.cc>
To: Stevie O <stevie@qrpff.net>
Cc: Larry McVoy <lm@bitmover.com>, Kent Borg <kentborg@borg.org>,
        linux-kernel@vger.kernel.org
Subject: Re: Versioning File Systems?
Message-ID: <20020419001208.A14615@mark.mielke.cc>
In-Reply-To: <20020418110558.A16135@borg.org> <20020418110558.A16135@borg.org> <20020418082025.N2710@work.bitmover.com> <5.1.0.14.2.20020418191904.028f1290@whisper.qrpff.net>
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On Thu, Apr 18, 2002 at 07:19:47PM -0400, Stevie O wrote:
> At 08:20 AM 4/18/2002 -0700, Larry McVoy wrote:
> >It's certainly a fun space, file system hacking is always fun.  There
> >doesn't seem to be a good match between file system operations and
> >SCM operations, especially stuff like checkin.  write != checkin.
> >But you can handle that with
> How about
>         fsync(fd) || close(fd) == checkin?

Source management systems usually work much better given explicit
control for the user.

ClearCase has MVFS to do what is being suggested. Compare:

    cat a.c                 # currently selected version of a.c
    cat a.c@@/main/5        # version 5 on the main branch

    cat a.c@@LINUX_2.4.18   # the version of a.c selected by the
                            # label 'LINUX_2.4.18'

Having a file system that implicitly performs these operations is
not very useful.

mark

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