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Date:	Fri, 15 Jun 2007 03:22:06 +0530
From:	Kalpak Shah <kalpak@...sterfs.com>
To:	cmm@...ibm.com
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>,
	Andreas Dilger <adilger@...sterfs.com>,
	Jean noel Cordenner <jean-noel.cordenner@...l.net>
Subject: Re: [PATCH 4/6] add noversion mount option

On Thu, 2007-06-14 at 13:50 -0700, Mingming Cao wrote:
> On Thu, 2007-06-14 at 21:26 +0530, Kalpak Shah wrote:
> > This patch adds a "noversion" mount option to disable inode version
> > updates.
> 
> Can you explain a bit more why we need this mount option? Is it because
> of performance concern? 

Lustre requires the counter to be globally unique on the entire
filesystem and hence needs to turnoff per-inode version updates. So in
the interlock meeting on 5th June, Ted has suggested the this approach.

"- Ted suggested having a flag in the superblock for i_version, with an 
additional option of having a global counter for Lustre's requirements.
i_version would be on by default, but give users who do not use the 
feature the option to turn it off and avoid any performance impact."

Thanks,
Kalpak.

> 
> Mingming
> 
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