From nobody Tue Nov 11 22:35:17 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1565998410; cv=none; d=zoho.com; s=zohoarc; b=GKDLb/oYA/g0NJIdhag1HLcGfwT3T4ErxH5D60if3loUG9evSsnXQHM8o8VyHlNfRbORnin7xn5ulRjJ02jx+NecvpOIF4J7lInDcyPGfv+UzORWvgsMjFDXh5jz3AorDw1N7R7j8EM28FYD2YRJwrH9Zy/Q/crK4PvPeXj6RHM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1565998410; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=VUkatBp/4EuNl67aaWOH/h/D1gi5hyCCUi1t0G5sO8k=; b=lxmVlkx/f20wKkcCdIz08JqU1/TE7XwqpmrkJGYlP1YfenlDCX5nBcVyow0EXVA1JbEugjTrcQLZAmE5N33yo6B0pufrn6F1KTPKxIQR+blru6MZEJu3WdxhiFxJLwMvlAechdGdfPzUyf1H+TzOPuyiPmgIsT0HBCpXCm3b6kc= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 15659984102591018.8607312849186; Fri, 16 Aug 2019 16:33:30 -0700 (PDT) Received: from localhost ([::1]:33320 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hyliq-00069k-Gk for importer@patchew.org; Fri, 16 Aug 2019 19:33:28 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:46677) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hylPn-0006cm-Sb for qemu-devel@nongnu.org; Fri, 16 Aug 2019 19:13:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hylPm-00062u-En for qemu-devel@nongnu.org; Fri, 16 Aug 2019 19:13:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:36046) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hylPj-0005wP-5P; Fri, 16 Aug 2019 19:13:43 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5DD002CD811; Fri, 16 Aug 2019 23:13:41 +0000 (UTC) Received: from probe.bos.redhat.com (dhcp-17-187.bos.redhat.com [10.18.17.187]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3245A19C6A; Fri, 16 Aug 2019 23:13:38 +0000 (UTC) From: John Snow To: qemu-devel@nongnu.org Date: Fri, 16 Aug 2019 19:13:01 -0400 Message-Id: <20190816231318.8650-20-jsnow@redhat.com> In-Reply-To: <20190816231318.8650-1-jsnow@redhat.com> References: <20190816231318.8650-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Fri, 16 Aug 2019 23:13:41 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 19/36] blockdev: reduce aio_context locked sections in bitmap add/remove 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: peter.maydell@linaro.org, Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org, qemu-stable@nongnu.org, Max Reitz , jsnow@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Vladimir Sementsov-Ogievskiy Commit 0a6c86d024c52 returned these locks back to add/remove functionality, to protect from intersection of persistent bitmap related IO with other IO. But other bitmap-related functions called here are unrelated to the problem, and there are no needs to keep these calls inside critical sections. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: John Snow Signed-off-by: John Snow Reviewed-by: Max Reitz Message-id: 20190708220502.12977-2-jsnow@redhat.com Signed-off-by: John Snow --- blockdev.c | 30 +++++++++++++----------------- 1 file changed, 13 insertions(+), 17 deletions(-) diff --git a/blockdev.c b/blockdev.c index a44ab1f709e..bcd766a1a24 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2813,7 +2813,6 @@ void qmp_block_dirty_bitmap_add(const char *node, con= st char *name, { BlockDriverState *bs; BdrvDirtyBitmap *bitmap; - AioContext *aio_context =3D NULL; =20 if (!name || name[0] =3D=3D '\0') { error_setg(errp, "Bitmap name cannot be empty"); @@ -2849,16 +2848,20 @@ void qmp_block_dirty_bitmap_add(const char *node, c= onst char *name, } =20 if (persistent) { - aio_context =3D bdrv_get_aio_context(bs); + AioContext *aio_context =3D bdrv_get_aio_context(bs); + bool ok; + aio_context_acquire(aio_context); - if (!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp))= { - goto out; + ok =3D bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp= ); + aio_context_release(aio_context); + if (!ok) { + return; } } =20 bitmap =3D bdrv_create_dirty_bitmap(bs, granularity, name, errp); if (bitmap =3D=3D NULL) { - goto out; + return; } =20 if (disabled) { @@ -2866,10 +2869,6 @@ void qmp_block_dirty_bitmap_add(const char *node, co= nst char *name, } =20 bdrv_dirty_bitmap_set_persistence(bitmap, persistent); - out: - if (aio_context) { - aio_context_release(aio_context); - } } =20 void qmp_block_dirty_bitmap_remove(const char *node, const char *name, @@ -2877,8 +2876,6 @@ void qmp_block_dirty_bitmap_remove(const char *node, = const char *name, { BlockDriverState *bs; BdrvDirtyBitmap *bitmap; - Error *local_err =3D NULL; - AioContext *aio_context =3D NULL; =20 bitmap =3D block_dirty_bitmap_lookup(node, name, &bs, errp); if (!bitmap || !bs) { @@ -2891,20 +2888,19 @@ void qmp_block_dirty_bitmap_remove(const char *node= , const char *name, } =20 if (bdrv_dirty_bitmap_get_persistence(bitmap)) { - aio_context =3D bdrv_get_aio_context(bs); + AioContext *aio_context =3D bdrv_get_aio_context(bs); + Error *local_err =3D NULL; + aio_context_acquire(aio_context); bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); + aio_context_release(aio_context); if (local_err !=3D NULL) { error_propagate(errp, local_err); - goto out; + return; } } =20 bdrv_release_dirty_bitmap(bs, bitmap); - out: - if (aio_context) { - aio_context_release(aio_context); - } } =20 /** --=20 2.21.0