Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F1565C10F03 for ; Thu, 7 Mar 2019 11:04:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A8ADB20835 for ; Thu, 7 Mar 2019 11:04:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=samba.org header.i=@samba.org header.b="v29+CGge" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726166AbfCGLEJ (ORCPT ); Thu, 7 Mar 2019 06:04:09 -0500 Received: from hr2.samba.org ([144.76.82.148]:31898 "EHLO 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Ni4gS17UG0YAZkvjncljeRd6UzGW+Jnep5B4tIYYzmbPnOnA1KhnhRlT5lICc7qvCK+d6cSR qwZDheb6YDf6miyYDFqUjGg0jAdZI5/RmaYxSWypa/tHB3ivQnKwKx5T2ud7ORnFESvtSaEg TMt9+YYVzXoQcRaCWWvnbFSFeI+4jbgjosLpUEFU7a8H1dVgrrHVj8K1pxc= Subject: Re: Better interop for NFS/SMB file share mode/reservation Message-ID: <5ebdb58b-26d9-c0f2-bd67-883bc4678ac7@samba.org> Date: Thu, 7 Mar 2019 12:03:56 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="4JA8QEcWxoNwT9QEADkNHnoXZ2Eb9RjwB" Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --4JA8QEcWxoNwT9QEADkNHnoXZ2Eb9RjwB Content-Type: multipart/mixed; boundary="8rZ41cW1nSRowoSk0jeZYZCgRK379ggoU"; protected-headers="v1" From: Stefan Metzmacher To: =?UTF-8?Q?Ralph_B=c3=b6hme?= , Jeremy Allison Cc: Linux NFS Mailing List , Volker.Lendecke@sernet.de, devel@lists.nfs-ganesha.org, Jeff Layton , Amir Goldstein , samba-technical , linux-fsdevel Message-ID: <5ebdb58b-26d9-c0f2-bd67-883bc4678ac7@samba.org> Subject: Re: Better interop for NFS/SMB file share mode/reservation References: <379106947f859bdf5db4c6f9c4ab8c44f7423c08.camel@kernel.org> <20190208155052.GB20573@fieldses.org> <20190208221239.GA199180@jra3> <20190214210652.GC9216@fieldses.org> <20190305214748.GD27437@fieldses.org> <20190306151150.GC2426@fieldses.org> <1ade4724a4e505baf7b7c23a76e44d58b931da1f.camel@kernel.org> <20190306210743.GE19279@jra3> In-Reply-To: --8rZ41cW1nSRowoSk0jeZYZCgRK379ggoU Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Am 06.03.19 um 22:25 schrieb Ralph B=C3=B6hme via samba-technical: >=20 > Jeremy Allison wrote: >> On Wed, Mar 06, 2019 at 03:31:08PM -0500, Jeff Layton wrote: >>> On Wed, 2019-03-06 at 10:11 -0500, J. Bruce Fields wrote: >>>> >>>> Jeff, wasn't there some work (on Ceph maybe?) on a userspace delegat= ion >>>> API? Is that close to what's needed? >>>> >>> >>> Here's the C headers for that stuff: >>> >>> https://github.com/ceph/ceph/blob/7ba6bece4187eda5d05a9b84211fe6ba= 8dd287bd/src/include/cephfs/libcephfs.h#L1734 >>> >>> It's simple enough and works for us in ganesha, and I think we can >>> probably adapt it to samba without too much difficulty. The callback >>> doesn't seem like it'll do for a kernel API though -- you'd almost >>> certainly need to do something different there (signals? inotify?). >> >> SMB3 leases have R/RW and Handle-based leases. >=20 > Just to be precise: SMB2.1+ has R, RH, RW and RWH leases. >=20 >> Handle leases allow multiple opens of the same pathname >> that get different handles to share the lease, allowing >> a client redirector to delay opens or closes locally >> so long as it has a handle lease. >=20 > That'a a propertly of leases in general, not just H-leases. The client = provides a lease key which is a GUID with each lease request >=20 >> >> Here are the semantics: >> >> https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-smb2/d= 8df943d-6ad7-4b30-9f58-96ae90fc6204 >> >> I'm not sure a simple file-descriptor based API is >> enough for us. Can he have a uuid or token based >> API instead where the server can chose what fd's >> to cover with a token ? >=20 > Yes, that would be ideal. If we want to design an useful API, we also need to think about all features: - file oplock/leases - directory leases - share modes - disconnected handles (for durable and persistent handles), which exists within the kernel for a while and can be reattached to process, using some kind of cookie and the same euid - the API needs ways to use epoll in order to do async opens and lease breaks. For opens the model of async socket connects could be used. Leases could have a signalfd-style api. We may not need everything at once, but we should have the full picture in mind. And we need working code in kernel and userspace that passes all tests (we may need to add additional test). Otherwise the kernel creates new syscalls, which wouldn't be used by Samba in the end. metze --8rZ41cW1nSRowoSk0jeZYZCgRK379ggoU-- --4JA8QEcWxoNwT9QEADkNHnoXZ2Eb9RjwB Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEfFbGo3YXpfgryIw9DbX1YShpvVYFAlyA+p0ACgkQDbX1YShp vVZobw//V+ZkDNgmAGV6mWKdEWJL22FCz90uDCXbie0FJsrHYRrVKUQh/x3y3/ON SVuXKuZF0hzTTm6xj0nf1rBJmUBWmpSrWW9bkmhsGSElNius4o45C5HEW+Gr//MV lytl6miG4d7O7CHhAH2Bf6jgNtwBDsHPMCIFiWR9iYFc6WLHIwy2/3PPwwj/kYn0 k/eal/m1nSrtZd3M3DXgWCkDCoykbW1yDvtYBqKpRPATTetr45OHJ5reYIcKtbih EFUE6I4zynrmS9Ptcpeg3EWiUkwW4GetGF9dxnZ32loT5dPm1IoaTFhd+TEHKPOM ipMrQFxHdGMDOX+ekTyG3BKbrmjX1WyyoMvQhwpM2dtA/Xzrq4UMfRuenIrrkzo5 hK7iV2aOVsd07Wu4zXZ4iCu8RRlHTlNAocWwAQEkHPP6enJI/Yeq8yGb4lEgVg7u tSejX06JFEoOPANuzWHt/C5DnDzTDdpPFhNJh5IvGDIyCHU4BJVwTIx2ukw4XrI7 TBTmXaQ1K//bEaAnGwdIEUaITkEXnaK8xaf61LEWDSGp0zcS7GtICxXGE8kTCZwg A8UPdAAzs2qvu4kKswjGRfya1XXwh8TeI95+wqmxSbrctehnKkwW+E2pDkbpTWx1 Hrt8C6VTkqJMAlimltNPgJWXCrwGd7xqGZV+vxCCPJBBEQLKBsU= =dQtc -----END PGP SIGNATURE----- --4JA8QEcWxoNwT9QEADkNHnoXZ2Eb9RjwB--