linux-kernel - Re: [PATCH 02/18] xstat: Add a pair of system calls to make extended file stats available [ver #6]

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Message-Id: <E1Oc08W-00CZuz-Ns@intern.SerNet.DE>
Date:	Thu, 22 Jul 2010 20:04:41 +0200
From:	Volker Lendecke <Volker.Lendecke@...Net.DE>
To:	Jeremy Allison <jra@...ba.org>
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	Jan Engelhardt <jengelh@...ozas.de>,
	linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org,
	samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 02/18] xstat: Add a pair of system calls to make
 extended  file stats available [ver #6]

On Thu, Jul 22, 2010 at 11:02:04AM -0700, Jeremy Allison wrote:
> 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, how many hours have you spent getting "posix
locking" to the point where it is now? :-)

Volker

P.S: For those not aware, "posix locking = yes" is
cross-protocol byte range locking done by smbd to co-operate
with local processes and NFS.
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