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=-12.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=unavailable 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 068C2C433B4 for ; Mon, 17 May 2021 13:50:58 +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 C4FC060FD7 for ; Mon, 17 May 2021 13:50:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C4FC060FD7 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com 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.128273.240848 (Exim 4.92) (envelope-from ) id 1liddu-00089w-OU; Mon, 17 May 2021 13:50:46 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 128273.240848; Mon, 17 May 2021 13:50:46 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1liddu-00089p-LP; Mon, 17 May 2021 13:50:46 +0000 Received: by outflank-mailman (input) for mailman id 128273; Mon, 17 May 2021 13:50:45 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1liddt-00089h-Nn for xen-devel@lists.xenproject.org; Mon, 17 May 2021 13:50:45 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 86d86362-0d13-4ec1-8858-52a87dfc5761; Mon, 17 May 2021 13:50:44 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 23CA6AEB6; Mon, 17 May 2021 13:50:44 +0000 (UTC) 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" X-Inumbo-ID: 86d86362-0d13-4ec1-8858-52a87dfc5761 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1621259444; h=from:from:reply-to: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=+7sasbVGYUEZ5AUFJyqaV2/43qQDZihNx+bYQeU0oug=; b=I7bynsVI2NinzMt6jLlxaT7EoTUkMzIIhstMwHywg/jo1hAPH9EXoyrraJJ4DSG2YpY6QI bFqeWwhBNI9Rq1Lz1hnEGwT+7cTBLBPJCgWs+IEqtsZF72gl9f1oYwWJgFZBD5AoVCVQ8w San4lRm2W38SFSoeeTeHGWizy6gMsAo= Subject: Re: [PATCH 2/8] xen/blkfront: read response from backend only once To: Juergen Gross Cc: Konrad Rzeszutek Wilk , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Boris Ostrovsky , Stefano Stabellini , Jens Axboe , linux-block@vger.kernel.org, xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org References: <20210513100302.22027-1-jgross@suse.com> <20210513100302.22027-3-jgross@suse.com> From: Jan Beulich Message-ID: <8bc3e4e7-a93f-cd8c-3f96-3a8caea38ed3@suse.com> Date: Mon, 17 May 2021 15:50:43 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <20210513100302.22027-3-jgross@suse.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit On 13.05.2021 12:02, Juergen Gross wrote: > In order to avoid problems in case the backend is modifying a response > on the ring page while the frontend has already seen it, just read the > response into a local buffer in one go and then operate on that buffer > only. > > Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich