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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS autolearn=no 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 8D19FC433E0 for ; Wed, 20 Jan 2021 17:19:37 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4900022CE3 for ; Wed, 20 Jan 2021 17:19:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4900022CE3 Authentication-Results: mail.kernel.org; dmarc=pass (p=none dis=none) header.from=xenproject.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.71653.128473 (Exim 4.92) (envelope-from ) id 1l2H8c-00024R-OU; Wed, 20 Jan 2021 17:19:22 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 71653.128473; Wed, 20 Jan 2021 17:19:22 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l2H8c-00024K-KJ; Wed, 20 Jan 2021 17:19:22 +0000 Received: by outflank-mailman (input) for mailman id 71653; Wed, 20 Jan 2021 17:19:21 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l2H8b-00023w-Cx for xen-devel@lists.xenproject.org; Wed, 20 Jan 2021 17:19:21 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l2H8b-0005mD-9Q for xen-devel@lists.xenproject.org; Wed, 20 Jan 2021 17:19:21 +0000 Received: from iwj (helo=mariner.uk.xensource.com) by xenbits.xenproject.org with local-bsmtp (Exim 4.92) (envelope-from ) id 1l2H8b-0006EE-5H for xen-devel@lists.xenproject.org; Wed, 20 Jan 2021 17:19:21 +0000 Received: from iwj by mariner.uk.xensource.com with local (Exim 4.89) (envelope-from ) id 1l2H8W-0006Wq-EB; Wed, 20 Jan 2021 17:19:16 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xenproject.org; s=20200302mail; h=References:In-Reply-To:Subject:Cc:To:Date :Message-ID:Content-Transfer-Encoding:Content-Type:MIME-Version:From; bh=lkoJsajRTqjuaapzrzmjxAR0UBpZZkSuxjJ7ke69Nps=; b=IOAAIdzsrn7sprxSUbQB4y3bKv WdB6vN/lFSJ0sxjuv20EjirvkDIrSjeWSvns8v5iq+H9xnbAx0/3OLOHrAP5/Rg7MjMJ7N9HVbvPM 7CEOsrm3U3s++fkdo5T/ljLNdtoPzSY+P2Cy38BChUkaYw0AadmB+BjKYR2L6C8tSGeA=; From: Ian Jackson MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <24584.26132.215376.983496@mariner.uk.xensource.com> Date: Wed, 20 Jan 2021 17:19:16 +0000 To: Manuel Bouyer Cc: Roger Pau =?iso-8859-1?Q?Monn=E9?= , xen-devel@lists.xenproject.org Subject: Re: [PATCH 05/24] Introduce locking functions for block device setup on NetBSD In-Reply-To: <20210120165923.GC5035@antioche.eu.org> References: <20201214163623.2127-1-bouyer@netbsd.org> <20201214163623.2127-6-bouyer@netbsd.org> <20201229112909.kprjtysxkg4p6y2i@Air-de-Roger> <20210104102037.GA2005@antioche.eu.org> <24584.18578.623201.789017@mariner.uk.xensource.com> <20210120155900.GA5035@antioche.eu.org> <24584.22125.355284.48139@mariner.uk.xensource.com> <20210120165923.GC5035@antioche.eu.org> X-Mailer: VM 8.2.0b under 24.5.1 (i686-pc-linux-gnu) Manuel Bouyer writes ("Re: [PATCH 05/24] Introduce locking functions for block device setup on NetBSD"): > Right, thanks. Then it would need to be done with 2 different calls > but I don't think that's a problem (even with the linux version it would > not be atomic anyway). Sorry, I forgot to reply to this. Yes, it would need to invocations of stat(1). You are correct that the Linux version is not atomic in that sense. Ian.