From nobody Sat Feb 7 05:49:07 2026 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 1494515790850575.5487564831792; Thu, 11 May 2017 08:16:30 -0700 (PDT) Received: from localhost ([::1]:48767 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d8ppM-0007ca-4B for importer@patchew.org; Thu, 11 May 2017 11:16:28 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42062) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d8pIM-0001Mb-2J for qemu-devel@nongnu.org; Thu, 11 May 2017 10:42:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d8pIL-00049A-CK for qemu-devel@nongnu.org; Thu, 11 May 2017 10:42:22 -0400 Received: from mx1.redhat.com ([209.132.183.28]:51030) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d8pIE-00046L-SY; Thu, 11 May 2017 10:42:15 -0400 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C43C88048A; Thu, 11 May 2017 14:42:13 +0000 (UTC) Received: from donizetti.redhat.com (ovpn-117-123.ams2.redhat.com [10.36.117.123]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v4BEg9A4012159; Thu, 11 May 2017 10:42:12 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com C43C88048A 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=pbonzini@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com C43C88048A From: Paolo Bonzini To: qemu-devel@nongnu.org Date: Thu, 11 May 2017 16:41:52 +0200 Message-Id: <20170511144208.24075-3-pbonzini@redhat.com> In-Reply-To: <20170511144208.24075-1-pbonzini@redhat.com> References: <20170511144208.24075-1-pbonzini@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Thu, 11 May 2017 14:42:13 +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] [PATCH 02/18] 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: famz@redhat.com, qemu-block@nongnu.org, stefanha@redhat.com 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" Reviewed-by: Stefan Hajnoczi Signed-off-by: Paolo Bonzini Reviewed-by: Alberto Garcia --- 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 a0de60acbc..3204e08c8f 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 eb90c529cd..b529f894be 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -623,6 +623,7 @@ 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 2.12.2