Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964910AbVIEW4L (ORCPT ); Mon, 5 Sep 2005 18:56:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964915AbVIEW4K (ORCPT ); Mon, 5 Sep 2005 18:56:10 -0400 Received: from clock-tower.bc.nu ([81.2.110.250]:3010 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S964910AbVIEW4J (ORCPT ); Mon, 5 Sep 2005 18:56:09 -0400 Subject: Re: [Linux-cluster] Re: GFS, what's remaining From: Alan Cox To: Andrew Morton Cc: teigland@redhat.com, Joel.Becker@oracle.com, ak@suse.de, linux-cluster@redhat.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20050905125309.4b657b08.akpm@osdl.org> References: <20050901104620.GA22482@redhat.com> <20050903183241.1acca6c9.akpm@osdl.org> <20050904030640.GL8684@ca-server1.us.oracle.com> <200509040022.37102.phillips@istop.com> <20050903214653.1b8a8cb7.akpm@osdl.org> <20050904045821.GT8684@ca-server1.us.oracle.com> <20050903224140.0442fac4.akpm@osdl.org> <20050905043033.GB11337@redhat.com> <20050905015408.21455e56.akpm@osdl.org> <20050905092433.GE17607@redhat.com> <20050905021948.6241f1e0.akpm@osdl.org> <1125922894.8714.14.camel@localhost.localdomain> <20050905125309.4b657b08.akpm@osdl.org> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Tue, 06 Sep 2005 00:20:11 +0100 Message-Id: <1125962411.8714.46.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.2 (2.2.2-5) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1358 Lines: 31 On Llu, 2005-09-05 at 12:53 -0700, Andrew Morton wrote: > > - How are they ref counted > > - What are the cleanup semantics > > - How do I pass a lock between processes (AF_UNIX sockets wont work now) > > - How do I poll on a lock coming free. > > - What are the semantics of lock ownership > > - What rules apply for inheritance > > - How do I access a lock across threads. > > - What is the permission model. > > - How do I attach audit to it > > - How do I write SELinux rules for it > > - How do I use mount to make namespaces appear in multiple vservers > > > > and thats for starters... > > Return an fd from create_lockspace(). That only answers about four of the questions. The rest only come out if create_lockspace behaves like a file system - in other words create_lockspace is better known as either mkdir or mount. Its certainly viable to make the lock/unlock functions taken a fd, it's just not clear why the current lock/unlock functions we have won't do the job. Being able to extend the functionality to leases later on may be very powerful indeed and will fit the existing API - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/