From patchwork Wed Nov 16 13:48:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emanuele Giuseppe Esposito X-Patchwork-Id: 13045243 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 7A533C433FE for ; Wed, 16 Nov 2022 13:56:18 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ovImx-0000lj-B9; Wed, 16 Nov 2022 08:49:15 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ovImr-0000gR-Tc for qemu-devel@nongnu.org; Wed, 16 Nov 2022 08:49:11 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ovImk-0007yp-F6 for qemu-devel@nongnu.org; Wed, 16 Nov 2022 08:49:09 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1668606535; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=g2+GJnkrBcVYy0m4pv+5qDBSIXbZhzgA3Sjaa/O5BJY=; b=Kc5qxzOu65nPeoWVS05MofTF19z5nXQo+VS+PxgLXpuWctNhg9Dz1MCPec0yxj+nwaou9z wjmRNaTrS/XKfi/3ppNfREAAUumALSLcCKPombYps2VptdiCOM0TESTh26PPDHxfxi6eqC 1YUvvZfbYaol5X9kgDUAtnn9uA714FU= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-16--PatpK5XOoqoxuZxSP6Tdw-1; Wed, 16 Nov 2022 08:48:53 -0500 X-MC-Unique: -PatpK5XOoqoxuZxSP6Tdw-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8B110811E67; Wed, 16 Nov 2022 13:48:53 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3DF894A9265; Wed, 16 Nov 2022 13:48:53 +0000 (UTC) From: Emanuele Giuseppe Esposito To: qemu-block@nongnu.org Cc: Kevin Wolf , Hanna Reitz , John Snow , Paolo Bonzini , Vladimir Sementsov-Ogievskiy , Stefan Hajnoczi , Fam Zheng , Eric Blake , Cleber Rosa , qemu-devel@nongnu.org, Emanuele Giuseppe Esposito Subject: [PATCH 04/20] block.c: wrlock in bdrv_replace_child_noperm Date: Wed, 16 Nov 2022 08:48:34 -0500 Message-Id: <20221116134850.3051419-5-eesposit@redhat.com> In-Reply-To: <20221116134850.3051419-1-eesposit@redhat.com> References: <20221116134850.3051419-1-eesposit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eesposit@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Protect the main function where graph is modified. Signed-off-by: Emanuele Giuseppe Esposito --- block.c | 6 ++++-- include/block/block_int-common.h | 1 + 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/block.c b/block.c index d3e168408a..4ef537a9f2 100644 --- a/block.c +++ b/block.c @@ -1416,6 +1416,7 @@ static void bdrv_child_cb_attach(BdrvChild *child) assert_bdrv_graph_writable(bs); QLIST_INSERT_HEAD(&bs->children, child, next); + if (bs->drv->is_filter || (child->role & BDRV_CHILD_FILTERED)) { /* * Here we handle filters and block/raw-format.c when it behave like @@ -2829,24 +2830,25 @@ static void bdrv_replace_child_noperm(BdrvChild *child, assert(bdrv_get_aio_context(old_bs) == bdrv_get_aio_context(new_bs)); } + bdrv_graph_wrlock(); if (old_bs) { if (child->klass->detach) { child->klass->detach(child); } - assert_bdrv_graph_writable(old_bs); + QLIST_REMOVE(child, next_parent); } child->bs = new_bs; if (new_bs) { - assert_bdrv_graph_writable(new_bs); QLIST_INSERT_HEAD(&new_bs->parents, child, next_parent); if (child->klass->attach) { child->klass->attach(child); } } + bdrv_graph_wrunlock(); /* * If the old child node was drained but the new one is not, allow diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index 791dddfd7d..fd9f40a815 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -71,6 +71,7 @@ enum BdrvTrackedRequestType { BDRV_TRACKED_TRUNCATE, }; + /* * That is not quite good that BdrvTrackedRequest structure is public, * as block/io.c is very careful about incoming offset/bytes being