Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751214AbWAYPLO (ORCPT ); Wed, 25 Jan 2006 10:11:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751211AbWAYPLO (ORCPT ); Wed, 25 Jan 2006 10:11:14 -0500 Received: from pat.uio.no ([129.240.130.16]:23270 "EHLO pat.uio.no") by vger.kernel.org with ESMTP id S1751214AbWAYPLN (ORCPT ); Wed, 25 Jan 2006 10:11:13 -0500 Subject: Re: RFC [patch 13/34] PID Virtualization Define new task_pid api From: Trond Myklebust To: "Eric W. Biederman" Cc: Arjan van de Ven , Alan Cox , Hubertus Franke , Dave Hansen , Greg KH , "Serge E. Hallyn" , linux-kernel@vger.kernel.org, Cedric Le Goater In-Reply-To: References: <20060117143258.150807000@sergelap> <20060117143326.283450000@sergelap> <1137511972.3005.33.camel@laptopd505.fenrus.org> <20060117155600.GF20632@sergelap.austin.ibm.com> <1137513818.14135.23.camel@localhost.localdomain> <1137518714.5526.8.camel@localhost.localdomain> <20060118045518.GB7292@kroah.com> <1137601395.7850.9.camel@localhost.localdomain> <43D14578.6060801@watson.ibm.com> <43D52592.8080709@watson.ibm.com> <1138050684.24808.29.camel@localhost.localdomain> <1138062125.24808.47.camel@localhost.localdomain> <1138137060.14675.73.camel@localhost.localdomain> <1138137305.2977.92.camel@laptopd505.fenrus.org> Content-Type: text/plain Date: Wed, 25 Jan 2006 10:10:11 -0500 Message-Id: <1138201811.8720.9.camel@lade.trondhjem.org> Mime-Version: 1.0 X-Mailer: Evolution 2.4.1 Content-Transfer-Encoding: 7bit X-UiO-Spam-info: not spam, SpamAssassin (score=-3.028, required 12, autolearn=disabled, AWL 1.78, FORGED_RCVD_HELO 0.05, RCVD_IN_SORBS_DUL 0.14, UIO_MAIL_IS_INTERNAL -5.00) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 809 Lines: 19 On Wed, 2006-01-25 at 02:58 -0700, Eric W. Biederman wrote: > >> On Maw, 2006-01-24 at 12:26 -0700, Eric W. Biederman wrote: > >> > There is at least NFS lockd that appreciates having a single integer > >> > per process unique identifier. So there is a practical basis for > >> > wanting such a thing. The NFS lock manager mainly wants a unique 32-bit identifier that can follow clone(CLONE_FILES). The reason is that the Linux VFS is forced to use the pointer to the file table as the "process identifier" for posix locks (i.e. fcntl() locks). Cheers, Trond - 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/