From: Jeremy Allison <jra-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
Subject: Re: [PATCH 02/18] xstat: Add a pair of system calls to make
 extended  file stats available [ver #6]
Date: Thu, 22 Jul 2010 11:02:04 -0700
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Cc: Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	Jeremy Allison <jra-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>, Volker.Lendecke-3ekOc4rQMZmzQB+pC5nmwQ@public.gmane.org,
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	Jan Engelhardt <jengelh-nopoi9nDyk+ELgA04lAiVw@public.gmane.org>,
	linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	samba-technical-w/Ol4Ecudpl8XjKLYN78aQ@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
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	linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
To: Trond Myklebust <trond.myklebust-41N18TsMXrtuMpJDpNschA@public.gmane.org>
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On Thu, Jul 22, 2010 at 12:58:50PM -0400, Trond Myklebust wrote:
> 
> That would make it impossible to export the filesystem with NFSv2 and
> v3. They do rely on ctime checking for certain operations (e.g. deciding
> when to invalidate access and acl caches). NFSv4 needs this too if the
> filesystem has no dedicated change attribute.
> 
> Still, I suppose the market for exporting the same filesystem with both
> NFS and Samba is limited...

Ask NetApp about that :-). They have built a rather large
business on just that fact :-).

Jeremy.