Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754433Ab3JLAlN (ORCPT ); Fri, 11 Oct 2013 20:41:13 -0400 Received: from mx1.redhat.com ([209.132.183.28]:4540 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752129Ab3JLAlL (ORCPT ); Fri, 11 Oct 2013 20:41:11 -0400 Date: Fri, 11 Oct 2013 20:42:44 -0400 From: Jeff Layton To: Scott Lovenberg Cc: Jeremy Allison , Andreas Dilger , "linux-fsdevel@vger.kernel.org Devel" , Ganesha NFS List , "samba-technical@lists.samba.org" , Linux Kernel Mailing List Subject: Re: [RFC PATCH 0/5] locks: implement "filp-private" (aka UNPOSIX) locks Message-ID: <20131011204244.72c2d672@corrin.poochiereds.net> In-Reply-To: References: <1381494322-2426-1-git-send-email-jlayton@redhat.com> <20131011200756.GB22160@fieldses.org> <20131011192118.483e436f@tlielax.poochiereds.net> <20131011234923.GD8688@samba2> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1551 Lines: 35 On Fri, 11 Oct 2013 20:18:58 -0400 Scott Lovenberg wrote: > > On Oct 11, 2013, at 19:49, Jeremy Allison wrote: > > > On Fri, 11 Oct 2013 15:36:43 -0600 Andreas Dilger wrote: > >>> > >>> At this point, my main questions are: > >>> > >>> 1) does this look useful, particularly for fileserver implementors? > > > > Yes from the Samba perspective. We'll have to keep the old > > code around for compatibility with non-Linux OS'es, but this > > will allow Linux Samba to short-circuit a bunch of logic > > we have to get around the insane POSIX locking semantics > > on close. > > > > Jeremy. > > From the peanut gallery, IIRC from college a few years back, wasn't the POSIX file locking stuff passed by all parties because they intended to do their own thing regardless of the standard? The reason that all locks are blown on a release is mostly because there were already implementations and no one wanted to push the issue, or am I misunderstanding/forgetting the history of file locks in POSIX? This blog post of Jeremy's explains some of the history: http://www.samba.org/samba/news/articles/low_point/tale_two_stds_os2.html See the section entitled "First Implementation Past the Post". -- Jeff Layton -- 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/