linux-kernel - Re: [PATCH 3/3] Add a pair of system calls to make extended file stats available [ver #2]

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Date:	Wed, 30 Jun 2010 11:22:17 +0100
From:	David Howells <dhowells@...hat.com>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	dhowells@...hat.com, viro@...IV.linux.org.uk, smfrench@...il.com,
	jlayton@...hat.com, mcao@...ibm.com,
	aneesh.kumar@...ux.vnet.ibm.com, linux-cifs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	samba-technical@...ts.samba.org, sjayaraman@...e.de,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/3] Add a pair of system calls to make extended file stats available [ver #2]

Andreas Dilger <adilger@...ger.ca> wrote:

> Note that when ext4 is mounted with the "i_version" option that the
> i_version field is also updated on regular files, for use by NFSv4.  See,
> for example, ext4_mark_iloc_dirty().
> 
> I had a hard time finding this, even though I knew it was there somewhere,
> because it isn't modifying "i_version" directly, but rather calling a helper
> function inode_inc_iversion().

Ah, okay.  Thanks!

> It probably makes sense to always return i_version, unless it is 0.

I didn't want to return it if it wasn't supported on the nominated file as
that may give a false sense of coherency.

David
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