[nfsv4] RFC 7530: Filehandle of opened file after the REMOVE
Marcel Telka <marcel@telka.sk> Fri, 09 December 2016 22:25 UTC
Return-Path: <marcel@telka.sk>
X-Original-To: nfsv4@ietfa.amsl.com
Delivered-To: nfsv4@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CBBDB12953C for <nfsv4@ietfa.amsl.com>; Fri, 9 Dec 2016 14:25:07 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.796
X-Spam-Level:
X-Spam-Status: No, score=-4.796 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RP_MATCHES_RCVD=-2.896] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YS9MnnzY-reG for <nfsv4@ietfa.amsl.com>; Fri, 9 Dec 2016 14:25:05 -0800 (PST)
Received: from tortuga.telka.sk (tortuga.telka.sk [185.14.234.118]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F2FA312954A for <nfsv4@ietf.org>; Fri, 9 Dec 2016 14:25:04 -0800 (PST)
Received: (qmail 1994 invoked from network); 9 Dec 2016 22:25:01 -0000
Received: from telcontar-wifi.in.telka.sk (HELO telcontar) (marcel@10.0.1.10) by tortuga.telka.sk with ESMTPSA (DHE-RSA-AES256-GCM-SHA384 encrypted); 9 Dec 2016 22:25:01 -0000
Date: Fri, 09 Dec 2016 23:25:00 +0100
From: Marcel Telka <marcel@telka.sk>
To: nfsv4@ietf.org
Message-ID: <20161209222500.GB1514@telcontar>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
User-Agent: Mutt/1.7.2 (2016-11-26)
Archived-At: <https://mailarchive.ietf.org/arch/msg/nfsv4/eINEVFzZeGCBbyfbnJzQwSnGLi0>
Subject: [nfsv4] RFC 7530: Filehandle of opened file after the REMOVE
X-BeenThere: nfsv4@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: NFSv4 Working Group <nfsv4.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/nfsv4>, <mailto:nfsv4-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/nfsv4/>
List-Post: <mailto:nfsv4@ietf.org>
List-Help: <mailto:nfsv4-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/nfsv4>, <mailto:nfsv4-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 09 Dec 2016 22:25:08 -0000
Hi, I'm not sure I understand RFC 7530 properly. Here is the scenario I'm not sure about: 1. clientA opens a file named with OPEN4_SHARE_DENY_NONE. 2. clientB opens the (same) file with OPEN4_SHARE_DENY_NONE. 3. clientB removes the file using the REMOVE operation. In section 16.26.5. there is this: o If the file was not opened with OPEN4_SHARE_DENY_WRITE or OPEN4_SHARE_DENY_BOTH, the server SHOULD delete the file's directory entry. However, until the last CLOSE of the file, the server MAY continue to allow access to the file via its filehandle. The above clearly says that for clientB the filehandle for the file after the REMOVE operation MAY be valid. The clientB just removed the file, so it should not be surprised the filename (obtained in step 2) is no longer valid. What is unclear to me is clientA. Is it okay for the server to 'forget' the filehandle even for clientA? If the filehandle won't be valid for clientA (after the REMOVE by clientB), then clientA might lost the access to the file anytime, and it have no easy chance to prevent that (and no way to recover from that). This sounds unfortunate and it breaks the traditional unix semantics: the file is there while I hold it opened. The only way to make sure the file is available until the final CLOSE seems to be to open the file with OPEN4_SHARE_DENY_WRITE or OPEN4_SHARE_DENY_BOTH, which sounds like overkill. Am I overlooking something? Thank you. -- +-------------------------------------------+ | Marcel Telka e-mail: marcel@telka.sk | | homepage: http://telka.sk/ | | jabber: marcel@jabber.sk | +-------------------------------------------+
- [nfsv4] RFC 7530: Filehandle of opened file after… Marcel Telka
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… David Noveck
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Marcel Telka
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… David Noveck
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Marcel Telka
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… David Noveck
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Marcel Telka
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Marcel Telka
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Trond Myklebust
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Trond Myklebust
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Marcel Telka
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… David Noveck
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Marcel Telka
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Trond Myklebust
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… J. Bruce Fields
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… David Noveck
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Trond Myklebust
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Trond Myklebust
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Benny Halevy
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Trond Myklebust
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Bruce James Fields
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Christoph Hellwig
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… David Noveck
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… David Noveck
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Christoph Hellwig
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Tom Talpey
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Rick Macklem
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Trond Myklebust
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… David Noveck
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… David Noveck
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Trond Myklebust
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… David Noveck
- Re: [nfsv4] RFC 7530: Filehandle of opened file a… Trond Myklebust