From patchwork Mon Jul 8 22:05:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Snow X-Patchwork-Id: 1129381 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com 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 ozlabs.org (Postfix) with ESMTPS id 45jKKk6Gpvz9sMr for ; Tue, 9 Jul 2019 08:06:34 +1000 (AEST) Received: from localhost ([::1]:45130 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hkbmF-0002D7-Sd for incoming@patchwork.ozlabs.org; Mon, 08 Jul 2019 18:06:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43979) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hkbl8-0001vw-8z for qemu-devel@nongnu.org; Mon, 08 Jul 2019 18:05:19 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hkbl5-0003gZ-KB for qemu-devel@nongnu.org; Mon, 08 Jul 2019 18:05:16 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49058) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hkbl2-0003aa-Cy; Mon, 08 Jul 2019 18:05:12 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2615E7CBA0; Mon, 8 Jul 2019 22:05:11 +0000 (UTC) Received: from probe.bos.redhat.com (dhcp-17-215.bos.redhat.com [10.18.17.215]) by smtp.corp.redhat.com (Postfix) with ESMTP id BE7C11001DC8; Mon, 8 Jul 2019 22:05:09 +0000 (UTC) From: John Snow To: qemu-block@nongnu.org, qemu-devel@nongnu.org Date: Mon, 8 Jul 2019 18:05:00 -0400 Message-Id: <20190708220502.12977-2-jsnow@redhat.com> In-Reply-To: <20190708220502.12977-1-jsnow@redhat.com> References: <20190708220502.12977-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Mon, 08 Jul 2019 22:05:11 +0000 (UTC) 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] [PATCH v3 1/3] 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: Fam Zheng , Kevin Wolf , vsementsov@virtuozzo.com, Juan Quintela , John Snow , "Dr. David Alan Gilbert" , Max Reitz , Stefan Hajnoczi , Markus Armbruster Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" 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 --- blockdev.c | 30 +++++++++++++----------------- 1 file changed, 13 insertions(+), 17 deletions(-) diff --git a/blockdev.c b/blockdev.c index 4d141e9a1f..01248252ca 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2811,7 +2811,6 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name, { BlockDriverState *bs; BdrvDirtyBitmap *bitmap; - AioContext *aio_context = NULL; if (!name || name[0] == '\0') { error_setg(errp, "Bitmap name cannot be empty"); @@ -2847,16 +2846,20 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name, } if (persistent) { - aio_context = bdrv_get_aio_context(bs); + AioContext *aio_context = 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 = bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp); + aio_context_release(aio_context); + if (!ok) { + return; } } bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); if (bitmap == NULL) { - goto out; + return; } if (disabled) { @@ -2864,10 +2867,6 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name, } bdrv_dirty_bitmap_set_persistence(bitmap, persistent); - out: - if (aio_context) { - aio_context_release(aio_context); - } } void qmp_block_dirty_bitmap_remove(const char *node, const char *name, @@ -2875,8 +2874,6 @@ void qmp_block_dirty_bitmap_remove(const char *node, const char *name, { BlockDriverState *bs; BdrvDirtyBitmap *bitmap; - Error *local_err = NULL; - AioContext *aio_context = NULL; bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); if (!bitmap || !bs) { @@ -2889,20 +2886,19 @@ void qmp_block_dirty_bitmap_remove(const char *node, const char *name, } if (bdrv_dirty_bitmap_get_persistence(bitmap)) { - aio_context = bdrv_get_aio_context(bs); + AioContext *aio_context = bdrv_get_aio_context(bs); + Error *local_err = NULL; + aio_context_acquire(aio_context); bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); + aio_context_release(aio_context); if (local_err != NULL) { error_propagate(errp, local_err); - goto out; + return; } } bdrv_release_dirty_bitmap(bs, bitmap); - out: - if (aio_context) { - aio_context_release(aio_context); - } } /**