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From: Uri Simchoni <uri@samba.org>
To: Amir Goldstein <amir73il@gmail.com>,
	Pavel Shilovskiy <pshilov@microsoft.com>
Cc: "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
	"Volker.Lendecke@sernet.de" <Volker.Lendecke@sernet.de>,
	Jeff Layton <jlayton@kernel.org>,
	"samba-technical@lists.samba.org"
	<samba-technical@lists.samba.org>,
	Trond Myklebust <trondmy@hammerspace.com>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: Re: Better interop for NFS/SMB file share mode/reservation
Date: Tue, 30 Apr 2019 11:12:28 +0300	[thread overview]
Message-ID: <677e86ee-59b9-0826-481f-955074d164ed@samba.org> (raw)
In-Reply-To: <CAOQ4uxirAW91yUe1nQUPPmarmMSxr_pco8NqKWB4srwyvgnRRA@mail.gmail.com>

On 4/30/19 3:31 AM, Amir Goldstein via samba-technical wrote:
>>
>> About O_DENYDELETE: I don't understand how we may reach a good interop story without a proper implementation of this flag. Windows apps may set it and Samba needs to respect it. If an NFS client removes such an opened file, what will Samba tell the Windows client?
>>
> 
> Samba will tell the Windows client:
> "Sorry, my administrator has decided to trade off interop with nfs on
> share modes,
> with DENY_DELETE functionality, so I cannot grant you DENY_DELETE that you
> requested."
> Not sure if that is workable. Samba developers need to chime in.
> 
> Thanks,
> Amir.
> 

On Windows you don't ask for DENY_DELETE, you get it by default unless
you ask to *allow* deletion. If you fopen() a file, even for
reading-only, the MSVC standard C library would open it with delete
denied because it does not explicitly request to allow it. My guess is
that runtimes of other high-level languages behave that way too on
Windows. That means pretty much everything would stop working.

Thanks,
Uri.

  reply	other threads:[~2019-04-30  8:12 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-08 11:20 Better interop for NFS/SMB file share mode/reservation Amir Goldstein
2019-02-08 13:10 ` Jeff Layton
2019-02-08 14:45   ` Amir Goldstein
2019-02-08 15:50     ` J. Bruce Fields
2019-02-08 20:02       ` Amir Goldstein
2019-02-08 20:16         ` J. Bruce Fields
2019-02-08 20:31           ` Amir Goldstein
2019-02-14 20:51             ` J. Bruce Fields
2019-02-15  7:31               ` Amir Goldstein
2019-02-15 20:09                 ` J. Bruce Fields
2019-02-08 22:12         ` Jeremy Allison
2019-02-09  4:04           ` Amir Goldstein
2019-02-14 21:06             ` J. Bruce Fields
2019-03-05 21:47               ` J. Bruce Fields
2019-03-06  7:09                 ` Amir Goldstein
2019-03-06 15:17                   ` J. Bruce Fields
2019-03-06 15:37                     ` [NFS-Ganesha-Devel] " Frank Filz
2019-03-08 21:38                       ` 'J. Bruce Fields'
2019-03-08 21:53                         ` Frank Filz
2019-03-06 15:11                 ` J. Bruce Fields
2019-03-06 20:31                   ` Jeff Layton
2019-03-06 21:07                     ` Jeremy Allison
2019-03-06 21:25                       ` Ralph Böhme
2019-03-07 11:03                         ` Stefan Metzmacher
2019-03-07 16:47                           ` Simo
2019-04-25 18:11                           ` Amir Goldstein
2019-03-06 21:55                       ` Jeff Layton
2019-02-08 16:03     ` Jeff Layton
2019-02-08 16:28       ` Jeffrey Layton
     [not found]       ` <CAOQ4uxgQsRaEOxz1aYzP1_1fzRpQbOm2-wuzG=ABAphPB=7Mxg@mail.gmail.com>
     [not found]         ` <20190426140023.GB25827@fieldses.org>
     [not found]           ` <CAOQ4uxhuxoEsoBbvenJ8eLGstPc4AH-msrxDC-tBFRhvDxRSNg@mail.gmail.com>
     [not found]             ` <20190426145006.GD25827@fieldses.org>
     [not found]               ` <e69d149c80187b84833fec369ad8a51247871f26.camel@kernel.org>
2019-04-27 20:16                 ` Amir Goldstein
2019-04-28 12:09                   ` Jeff Layton
2019-04-28 13:45                     ` Amir Goldstein
2019-04-28 15:06                       ` Trond Myklebust
2019-04-28 22:00                         ` Amir Goldstein
2019-04-28 22:08                           ` Trond Myklebust
2019-04-28 22:33                             ` Amir Goldstein
2019-04-29  0:57                               ` Trond Myklebust
2019-04-29 11:42                                 ` Amir Goldstein
2019-04-29 13:10                                   ` Trond Myklebust
2019-04-29 20:29                                 ` Jeff Layton
2019-04-29 22:33                                   ` Pavel Shilovskiy
2019-04-30  0:31                                     ` Amir Goldstein
2019-04-30  8:12                                       ` Uri Simchoni [this message]
2019-04-30  9:22                                         ` Amir Goldstein
2019-02-11  5:31     ` ronnie sahlberg

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