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

[J. Bruce Fields]

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@xxxxxxxxxxxxxxxxxxx> 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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