In-Reply-To: <4676B4B9.9030002@hawkeye.stone.uk.eu.org>
To: Jack Stone <jack@hawkeye.stone.uk.eu.org>
Cc: akpm@linux-foundation.org, alan <alan@clueserver.org>, hpa@zytor.com,
       linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
       viro@zeniv.linux.org.uk
MIME-Version: 1.0
Subject: Re: Versioning file system
Message-ID: <OF7FA807A1.64C0D5AF-ON882572FE.0061B34C-882572FE.00628322@us.ibm.com>
From: Bryan Henderson <hbryan@us.ibm.com>
Date: Mon, 18 Jun 2007 10:56:05 -0700
Content-Type: text/plain; charset="US-ASCII"
Sender: linux-kernel-owner@vger.kernel.org
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>The question remains is where to implement versioning: directly in
>individual filesystems or in the vfs code so all filesystems can use it?

Or not in the kernel at all.  I've been doing versioning of the types I 
described for years with user space code and I don't remember feeling that 
I compromised in order not to involve the kernel.

Of course, if you want to do it with snapshots and COW, you'll have to ask 
where in the kernel to put that, but that's not a file versioning 
question; it's the larger snapshot question.

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


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