From mboxrd@z Thu Jan 1 00:00:00 1970 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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 477E2C4646D for ; Sat, 11 Aug 2018 20:20:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EE74A21A00 for ; Sat, 11 Aug 2018 20:20:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EE74A21A00 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727603AbeHKWz3 (ORCPT ); Sat, 11 Aug 2018 18:55:29 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:56310 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727379AbeHKWz3 (ORCPT ); Sat, 11 Aug 2018 18:55:29 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5A4ED4022909; Sat, 11 Aug 2018 20:20:11 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-120-78.rdu2.redhat.com [10.10.120.78]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9E89A104947B; Sat, 11 Aug 2018 20:20:08 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: <153313703562.13253.5766498657900728120.stgit@warthog.procyon.org.uk> <153313723557.13253.9055982745313603422.stgit@warthog.procyon.org.uk> <87in4n9zg0.fsf@xmission.com> <27374.1533824694@warthog.procyon.org.uk> To: Miklos Szeredi Cc: dhowells@redhat.com, "Eric W. Biederman" , Al Viro , Linux API , Linus Torvalds , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 28/33] vfs: syscall: Add fsconfig() for configuring and managing a context [ver #11] MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <5151.1534018808.1@warthog.procyon.org.uk> Date: Sat, 11 Aug 2018 21:20:08 +0100 Message-ID: <5152.1534018808@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Sat, 11 Aug 2018 20:20:11 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Sat, 11 Aug 2018 20:20:11 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'dhowells@redhat.com' RCPT:'' Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Miklos Szeredi wrote: > You can determine at fsopen() time whether the filesystem is able to > support the O_EXCL behavior? If so, then it's trivial to enable this > conditionally. I think that's what Eric is asking for, it's obviously > not fair to ask for a change in behavior of the legacy interface. It's not trivial, see btrfs and nfs :-/ David