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=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 6C3BEC4361B for ; Wed, 16 Dec 2020 11:59:00 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 AC82B23382 for ; Wed, 16 Dec 2020 11:58:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AC82B23382 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:49296 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kpVSM-0001q5-6B for qemu-devel@archiver.kernel.org; Wed, 16 Dec 2020 06:58:58 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:40812) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kpVRM-0001AZ-Rs for qemu-devel@nongnu.org; Wed, 16 Dec 2020 06:57:57 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:41777) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kpVRJ-0003EP-Bc for qemu-devel@nongnu.org; Wed, 16 Dec 2020 06:57:56 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1608119872; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ubqAnZsA6rvL3fOKSX1fYzqBXOnn4Ul0yTm2zrsA3bc=; b=ZLssD8Vs+O7tiO5VqINrDKkb+ohmDjRsDJJjQQAg3vt20kxCrm3axi0EszkoAJaPm8wPt5 QEnwlkJzbiMYPJFshuPONgu4zodb1bQ+09g4aoMRb6AmNZdiVYdqlkIeQb1Mrc0dDY5KX7 6t7OGNHdXTQR4ofPoxRljLewycIlcY4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-439-RIjE4ycBNbSOD_HhTECy8w-1; Wed, 16 Dec 2020 06:57:51 -0500 X-MC-Unique: RIjE4ycBNbSOD_HhTECy8w-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9B319801B16; Wed, 16 Dec 2020 11:57:49 +0000 (UTC) Received: from merkur.fritz.box (ovpn-115-50.ams2.redhat.com [10.36.115.50]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 660821975F; Wed, 16 Dec 2020 11:57:48 +0000 (UTC) Date: Wed, 16 Dec 2020 12:57:46 +0100 From: Kevin Wolf To: David Edmondson Subject: Re: [PATCH] block: report errno when flock fcntl fails Message-ID: <20201216115746.GC7548@merkur.fritz.box> References: <20201215190127.1765595-1-david.edmondson@oracle.com> <20201216112940.GB7548@merkur.fritz.box> MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kwolf@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=216.205.24.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-trivial@nongnu.org, qemu-devel@nongnu.org, qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Am 16.12.2020 um 12:38 hat David Edmondson geschrieben: > On Wednesday, 2020-12-16 at 12:29:40 +01, Kevin Wolf wrote: > > > Am 15.12.2020 um 20:01 hat David Edmondson geschrieben: > >> When a call to fcntl(2) for the purpose of manipulating file locks > >> fails, report the error returned by fcntl. > >> > >> Signed-off-by: David Edmondson > > > > Is appending "Resource temporarily unavailable" in the common case (a > > file locked by another process) actually an improvement for the message > > or more confusing? It would be good to mention the motivation for the > > change in the commit message. > > Distinguishing between the common case and others is at least a start > when trying to figure out why it failed. We have potentially useful > information to assist in diagnosis, why throw it away? I agree in principle, just when I saw the result, it felt more confusing than helpful. Maybe the best option would be to include the errno only if it's different from EAGAIN? Then the qemu-iotests reference output would probably stay unchanged, too. > In the case I encountered the failure appears to have been caused by > SELinux misconfiguration. Ah, so you got EPERM? It can useful information in the future, let's include it in the commit message. > > Either way, this breaks some qemu-iotests cases whose reference output > > needs to be updated. > > Will fix and send a v2. Thanks! Kevin