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_PATCH,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 E7368C4708F for ; Tue, 1 Jun 2021 05:59:08 +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 8198561263 for ; Tue, 1 Jun 2021 05:59:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8198561263 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]:60716 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lnxQh-0001i0-Fy for qemu-devel@archiver.kernel.org; Tue, 01 Jun 2021 01:59:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57770) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lnxPL-00086M-U4 for qemu-devel@nongnu.org; Tue, 01 Jun 2021 01:57:43 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:42741) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lnxPJ-00020h-V1 for qemu-devel@nongnu.org; Tue, 01 Jun 2021 01:57:43 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1622527060; 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; bh=REAMjlgbKVv1FpEmi0AU5ewnvZli0sC6bd97Pas+jfg=; b=Emuj8pIpYHaZD2cLWXrZ0apvZSuhaICuQMCJAWBhOxVUFsNWSP98agYEymnBLbvi503BQ4 aiA1ebpbN3AaC8XCjOn8e8WZuR8nfQ1cK3ArDQ2oOAY7hanO1ZSyfLzwlT4ZEsU8x9LS5R 3D3Kw4mvcgeidF/iHaYH1w9AY38Vc+c= 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-88-7kiSZ8ApMFOcX1b6BsgFzg-1; Tue, 01 Jun 2021 01:57:38 -0400 X-MC-Unique: 7kiSZ8ApMFOcX1b6BsgFzg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A1EAC801B14; Tue, 1 Jun 2021 05:57:37 +0000 (UTC) Received: from toolbox.redhat.com (unknown [10.33.36.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8865F69FA4; Tue, 1 Jun 2021 05:57:29 +0000 (UTC) From: Sergio Lopez To: qemu-devel@nongnu.org Subject: [PATCH 0/2] nbd/server: Quiesce server on drained section Date: Tue, 1 Jun 2021 07:57:26 +0200 Message-Id: <20210601055728.90849-1-slp@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=slp@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=170.10.133.124; envelope-from=slp@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.372, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=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 , Vladimir Sementsov-Ogievskiy , Sergio Lopez , qemu-block@nongnu.org, Max Reitz , Nir Soffer Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Before switching between AioContexts we need to make sure that we're=0D fully quiesced ("nb_requests =3D=3D 0" for every client) when entering the= =0D drained section. Otherwise, coroutines may be run in the wrong context=0D after the switch, leading to a number of critical issues.=0D =0D To accomplish this, we add ".drained_poll" to BlockDevOps and use it=0D in the NBD server, along with ".drained_being" and "drained_end", to=0D coordinate the quiescing of the server while entering a drained=0D section.=0D =0D Sergio Lopez (2):=0D block-backend: add drained_poll=0D nbd/server: Use drained block ops to quiesce the server=0D =0D block/block-backend.c | 7 ++-=0D include/sysemu/block-backend.h | 4 ++=0D nbd/server.c | 99 +++++++++++++++++++++++++---------=0D 3 files changed, 85 insertions(+), 25 deletions(-)=0D =0D --=20=0D 2.26.2=0D =0D