linux-kernel - Re: [PATCH 0/7] Permit filesystem local caching and NFS superblock sharing [try #13]

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Date:	Tue, 05 Sep 2006 15:01:31 +0800
From:	Ian Kent <raven@...maw.net>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	David Howells <dhowells@...hat.com>, Andrew Morton <akpm@...l.org>,
	torvalds@...l.org, steved@...hat.com,
	linux-fsdevel@...r.kernel.org, linux-cachefs@...hat.com,
	nfsv4@...ux-nfs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] Permit filesystem local caching and NFS superblock
	sharing [try #13]

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.



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