From patchwork Thu Jul 2 12:56:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= X-Patchwork-Id: 11638741 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9B98F739 for ; Thu, 2 Jul 2020 12:57:17 +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 7207920772 for ; Thu, 2 Jul 2020 12:57:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="PH8ZZrU2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7207920772 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:42866 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jqymC-0007Yd-NW for patchwork-qemu-devel@patchwork.kernel.org; Thu, 02 Jul 2020 08:57:16 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53494) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jqylN-00066P-Kb for qemu-devel@nongnu.org; Thu, 02 Jul 2020 08:56:25 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:21860 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jqylM-0004Uk-70 for qemu-devel@nongnu.org; Thu, 02 Jul 2020 08:56:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1593694583; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=RzCcw/J903H7d+tOkDz+NR6v5DuG2R6mW41FFwjovBM=; b=PH8ZZrU2mSOzgh5UjfuLcjKQaUiV6zZe0/HekwfnvwHJXM+8sb+GGwPZLauY1jMNga57ji RdP2NIyt5Fyo/pn3qtZIs/I/48VLiiKSGcC8HUX5F95+TP5j8y+jwPTsKHWmEemaRSS6+F mv7vVbkWhLZlUCOcrRhhOfCVpriTcm8= 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-26-0a3UHkgTOdejo403e1ZbGw-1; Thu, 02 Jul 2020 08:56:19 -0400 X-MC-Unique: 0a3UHkgTOdejo403e1ZbGw-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 E8CB719057A3; Thu, 2 Jul 2020 12:56:18 +0000 (UTC) Received: from localhost.localdomain.com (unknown [10.36.110.52]) by smtp.corp.redhat.com (Postfix) with ESMTP id 12B482B4CA; Thu, 2 Jul 2020 12:56:15 +0000 (UTC) From: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH v2 1/3] util: validate whether O_DIRECT is supported after failure Date: Thu, 2 Jul 2020 13:56:10 +0100 Message-Id: <20200702125612.2176194-2-berrange@redhat.com> In-Reply-To: <20200702125612.2176194-1-berrange@redhat.com> References: <20200702125612.2176194-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.61; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/02 03:42:59 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: Kevin Wolf , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , qemu-block@nongnu.org, Markus Armbruster , =?utf-8?q?Phi?= =?utf-8?q?lippe_Mathieu-Daud=C3=A9?= , P J P , Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Currently we suggest that a filesystem may not support O_DIRECT after seeing an EINVAL. Other things can cause EINVAL though, so it is better to do an explicit check, and then report a definitive error message. Signed-off-by: Daniel P. Berrangé Reviewed-by: Philippe Mathieu-Daudé --- util/osdep.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/util/osdep.c b/util/osdep.c index 4829c07ff6..e2b7507ee2 100644 --- a/util/osdep.c +++ b/util/osdep.c @@ -332,9 +332,11 @@ int qemu_open(const char *name, int flags, ...) } #ifdef O_CLOEXEC - ret = open(name, flags | O_CLOEXEC, mode); -#else + flags |= O_CLOEXEC; +#endif ret = open(name, flags, mode); + +#ifndef O_CLOEXEC if (ret >= 0) { qemu_set_cloexec(ret); } @@ -342,8 +344,13 @@ int qemu_open(const char *name, int flags, ...) #ifdef O_DIRECT if (ret == -1 && errno == EINVAL && (flags & O_DIRECT)) { - error_report("file system may not support O_DIRECT"); - errno = EINVAL; /* in case it was clobbered */ + int newflags = flags & ~O_DIRECT; + ret = open(name, newflags, mode); + if (ret != -1) { + close(ret); + error_report("file system does not support O_DIRECT"); + errno = EINVAL; + } } #endif /* O_DIRECT */