From nobody Wed Nov 5 19:47:27 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1496391485014376.15804012825265; Fri, 2 Jun 2017 01:18:05 -0700 (PDT) Received: from localhost ([::1]:48448 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dGhmV-0007Fn-KF for importer@patchew.org; Fri, 02 Jun 2017 04:18:03 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54384) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dGhgM-0001SS-BT for qemu-devel@nongnu.org; Fri, 02 Jun 2017 04:11:43 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dGhgL-00029g-6n for qemu-devel@nongnu.org; Fri, 02 Jun 2017 04:11:42 -0400 Received: from mx1.redhat.com ([209.132.183.28]:15560) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dGhgL-00028a-0y for qemu-devel@nongnu.org; Fri, 02 Jun 2017 04:11:41 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1392780479; Fri, 2 Jun 2017 08:11:40 +0000 (UTC) Received: from lemon.redhat.com (ovpn-12-49.pek2.redhat.com [10.72.12.49]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7D6F260A99; Fri, 2 Jun 2017 08:11:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 1392780479 Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=famz@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 1392780479 From: Fam Zheng To: qemu-devel@nongnu.org Date: Fri, 2 Jun 2017 16:11:04 +0800 Message-Id: <20170602081120.3497-7-famz@redhat.com> In-Reply-To: <20170602081120.3497-1-famz@redhat.com> References: <20170602081120.3497-1-famz@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Fri, 02 Jun 2017 08:11:40 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL v2 06/22] block: access quiesce_counter with atomic ops X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, Stefan Hajnoczi Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Paolo Bonzini Reviewed-by: Stefan Hajnoczi Reviewed-by: Alberto Garcia Signed-off-by: Paolo Bonzini Message-Id: <20170525163225.29954-3-pbonzini@redhat.com> Signed-off-by: Fam Zheng --- block/io.c | 4 ++-- include/block/block_int.h | 1 + 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/block/io.c b/block/io.c index 98c690f..70643df 100644 --- a/block/io.c +++ b/block/io.c @@ -241,7 +241,7 @@ void bdrv_drained_begin(BlockDriverState *bs) return; } =20 - if (!bs->quiesce_counter++) { + if (atomic_fetch_inc(&bs->quiesce_counter) =3D=3D 0) { aio_disable_external(bdrv_get_aio_context(bs)); bdrv_parent_drained_begin(bs); } @@ -252,7 +252,7 @@ void bdrv_drained_begin(BlockDriverState *bs) void bdrv_drained_end(BlockDriverState *bs) { assert(bs->quiesce_counter > 0); - if (--bs->quiesce_counter > 0) { + if (atomic_fetch_dec(&bs->quiesce_counter) > 1) { return; } =20 diff --git a/include/block/block_int.h b/include/block/block_int.h index 5f99cdb..9691db3 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -637,6 +637,7 @@ struct BlockDriverState { /* do we need to tell the quest if we have a volatile write cache? */ int enable_write_cache; =20 + /* Accessed with atomic ops. */ int quiesce_counter; }; =20 --=20 2.9.4