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Date:	Wed, 30 May 2007 22:25:14 -0400
From:	Trond Myklebust <>
Cc:	Andreas Dilger <>,,,,
Subject: Re: [patch 2/2] i_version update - ext4 part

On Wed, 2007-05-30 at 16:48 -0700, Mingming Cao wrote:
> On Tue, 2007-05-29 at 16:58 -0600, Andreas Dilger wrote:
> > I don't know what the NFS requirements for the version are.  There may
> > also be some complaints from others if the i_version is 64 bits because
> > this contributes to generic inode growth and isn't used for other
> > filesystems.
> > 
> That should benefit for other filesystems, as I thought this NFS
> requirements apply to all filesystems. 

Right. The point here is that the NFS protocol needs to impose certain
requirements on _all_ filesystems that want to be supported, and so it
is in the interest of everyone to have a generic update mechanism
available in the VFS in order to avoid code (and bug) replication.

Now if Lustre doesn't care about NFS compatibility, then I suppose it
would be fairly easy to engineer the i_version update interface to allow
them to use that field in whatever way suits them best.


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