linux-kernel - Re: MS_I_VERSION added in 2.6.25

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Message-ID: <20090626184522.GF7182@mit.edu>
Date:	Fri, 26 Jun 2009 14:45:22 -0400
From:	Theodore Tso <tytso@....edu>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	mtk.manpages@...il.com, jean-noel.cordenner@...l.net,
	cmm@...ibm.com, lkml <linux-kernel@...r.kernel.org>,
	linux-man <linux-man@...r.kernel.org>,
	mk <michael.kerrisk@...il.com>
Subject: Re: MS_I_VERSION added in 2.6.25

On Fri, Jun 26, 2009 at 01:11:44PM -0400, Christoph Hellwig wrote:
> On Fri, Jun 26, 2009 at 08:46:34AM +0200, Michael Kerrisk wrote:
> > Hi,
> > 
> > Linux 2.6.25 added the MS_I_VERSION flag for inode versioning. Some
> > text on this should be added to the mount(2) man page. Could someone
> > of you provide a short description of
> > 
> > * What inode versions are used for
> 
> I don't think it should be documented.  It should never have been a
> user-visible option to start with and I'm eventually going to fix that.
> 
> The correct way to do this would be a feature flag in the superblock.

Agreed, the intention was this was something which NFSv4 would request
of the filesystem, by flipping a bit.  I don't see a good reason why a
user would ever want to explicit request 64-bit version numbers, since
they're not even visible to userspace.

						- Ted
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