linux-kernel - Re: [PATCH 0/3] Add O_DENY* flags to fcntl and cifs

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Date:	Mon, 17 Dec 2012 10:36:44 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Steve French <smfrench@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Shilovsky <piastry@...rsoft.ru>,
	David Laight <david@....co.uk>,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-cifs@...r.kernel.org,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	wine-devel@...ehq.org
Subject: Re: [PATCH 0/3] Add O_DENY* flags to fcntl and cifs

On Fri, Dec 14, 2012 at 01:19:18PM -0600, Steve French wrote:
> On Fri, Dec 14, 2012 at 9:30 AM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> >> We can make this feature (passing O_DENY* flags received from clients
> >> to filesystem) can be turned on/off on Samba/NFS server to let this
> >> particular use case work. In general, I think we really need to be
> >> sure that nobody has a read access for files that a Windows process
> >> opened with O_DENYREAD (because there can be important reasons for the
> >> Windows process to do so).
> >
> > It should only affect windows emulated tasks, nothing else
> 
> yes, but not just wine - there is probably a case for Samba server and
> NFSv4 to optionally request such behafvior).

Agreed, but:

> Also we are likely to
> see more cases where users want to run Samba over an NFS mount and
> vice versa.

I don't personally see the interest in this case.

(And in fact I'd rather we removed the nfs export code for cifs; I seem
to recall from the last discussion that filehandle lookups get ESTALE
for inodes that have gone out of cache, and that that wasn't really
fixable.)

--b.
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