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Date: Thu, 22 Jul 2010 11:07:51 -0700
From: Jeremy Allison <jra@samba.org>
To: Volker Lendecke <Volker.Lendecke@SerNet.DE>
Cc: Jeremy Allison <jra@samba.org>,
        Trond Myklebust <trond.myklebust@fys.uio.no>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        David Howells <dhowells@redhat.com>,
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Subject: Re: [PATCH 02/18] xstat: Add a pair of system calls to make
 extended  file stats available [ver #6]
Message-ID: <20100722180751.GC32008@samba1>
Reply-To: Jeremy Allison <jra@samba.org>
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On Thu, Jul 22, 2010 at 08:04:41PM +0200, Volker Lendecke wrote:
> 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.

The time is counted in years, not hours :-).