From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Kent <raven@themaw.net>
Subject: Re: [PATCH 0/7] Permit filesystem local caching and NFS superblock
	sharing [try #13]
Date: Tue, 05 Sep 2006 15:01:31 +0800
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Cc: Andrew Morton <akpm@osdl.org>, nfsv4@linux-nfs.org, steved@redhat.com,
	linux-kernel@vger.kernel.org,
	David Howells <dhowells@redhat.com>, torvalds@osdl.org,
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To: Trond Myklebust <trond.myklebust@fys.uio.no>
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On Tue, 2006-09-05 at 14:06 +0800, Ian Kent wrote:
> On Tue, 2006-09-05 at 00:53 -0400, Trond Myklebust wrote:
> > On Tue, 2006-09-05 at 12:03 +0800, Ian Kent wrote:
> > > Sure but this is an old version of autofs which is in use so changing
> > > the expected behavior of a system call is not acceptable and I expect
> > > other applications may well have a problem with this also.
> > 
> > Applications that rely on mkdir() to never return EACCES are broken.
> > Particularly so in an selinux system (as was the case here).
> 
> That's not quite right.
> 
> autofs v4 doesn't rely on mkdir never returning EACCESS just that it
> return EEXIST if the directory exists. Never the less if the behavior of
> stat will work in this case I'll change v4 to do it the way you suggest
> (as v5 does already). 

Aaah. Wrong again!

Although v5 doesn't attempt to mount an NFS export if the directory
doesn't exist it does end up doing a mkdir later as the most common case
is mounting an NFS export within an autofs filesystem or other, usually
local filesystem.