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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]:36678 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kdbgo-0001LC-Ik for qemu-devel@archiver.kernel.org; Fri, 13 Nov 2020 11:12:42 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:41400) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kdbff-0000iL-82 for qemu-devel@nongnu.org; Fri, 13 Nov 2020 11:11:31 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:31624) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kdbfd-00065e-En for qemu-devel@nongnu.org; Fri, 13 Nov 2020 11:11:30 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605283888; 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=hnkIHRRh8nrtjh4GrAqdUcqwkvRVvAiul6ROoDByPkE=; b=eD/HNNUKFyKCCF91YssLjM9TYbqKEMeOwEBTcVwnHExXKvKg3dQfWLCqXfMCJ2AfoxiWLh eGjDizFNHnu7ts7vbJGejSOIAx+/qCCOD/zBWwVNVcfRz83virvXTEhGKjs3A73UjjpjCM NIFwmjf2XxKp7V8eNgVITGOZEVuhBoo= 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-266-BX0sUqAxNvC7vwRq0a0yXA-1; Fri, 13 Nov 2020 11:11:24 -0500 X-MC-Unique: BX0sUqAxNvC7vwRq0a0yXA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9BF9E1084C96; Fri, 13 Nov 2020 16:11:23 +0000 (UTC) Received: from dresden.str.redhat.com (ovpn-114-96.ams2.redhat.com [10.36.114.96]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2F88560C11; Fri, 13 Nov 2020 16:11:22 +0000 (UTC) Subject: Re: [PATCH v3 2/2] quorum: Implement bdrv_co_pwrite_zeroes() To: Alberto Garcia , qemu-devel@nongnu.org References: <2faad461e6bffc4a50547547b8c20c39e0f544e8.1605111801.git.berto@igalia.com> <5b5e73f3-a045-268d-e82a-f652668a8f02@redhat.com> From: Max Reitz Message-ID: <552f29f1-5b6a-82d3-a55f-100b460bcc6a@redhat.com> Date: Fri, 13 Nov 2020 17:11:20 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=63.128.21.124; envelope-from=mreitz@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/12 16:09:27 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=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: Kevin Wolf , Tao Xu , qemu-block@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 13.11.20 17:07, Alberto Garcia wrote: > On Fri 13 Nov 2020 12:49:04 PM CET, Max Reitz wrote: >> On 11.11.20 17:53, Alberto Garcia wrote: >>> This simply calls bdrv_co_pwrite_zeroes() in all children >>> >>> Signed-off-by: Alberto Garcia >>> --- >>> block/quorum.c | 18 ++++++++++++++++-- >>> tests/qemu-iotests/312 | 7 +++++++ >>> tests/qemu-iotests/312.out | 4 ++++ >>> 3 files changed, 27 insertions(+), 2 deletions(-) >> >> Should we set supported_zero_flags to something? I think we can at >> least set BDRV_REQ_NO_FALLBACK. We could also try BDRV_REQ_FUA. > > We could set all supported_zero_flags as long as all children support > them, right? Sure, I was just thinking that we could set these regardless of whether the children support them, because (on zero-writes) the block layer will figure out for us whether the child nodes support them. O:) >>> + if (acb->flags & BDRV_REQ_ZERO_WRITE) { >>> + sacb->ret = bdrv_co_pwrite_zeroes(s->children[i], acb->offset, >>> + acb->bytes, acb->flags); >>> + } else { >>> + sacb->ret = bdrv_co_pwritev(s->children[i], acb->offset, acb->bytes, >>> + acb->qiov, acb->flags); >>> + } >> >> Seems unnecessary (bdrv_co_pwritev() can handle BDRV_REQ_ZERO_WRITE), >> but perhaps it’s good to be explicit. > > pwrite_zeroes() does this additionaly: > > if (!(child->bs->open_flags & BDRV_O_UNMAP)) { > flags &= ~BDRV_REQ_MAY_UNMAP; > } Interesting. Technically, Quorum doesn’t support that flag (in supported_zero_flags O:))), so it shouldn’t appear, but, er, well then. Max