From patchwork Thu Nov 11 12:08:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hanna Czenczek X-Patchwork-Id: 12614731 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD8E0C433F5 for ; Thu, 11 Nov 2021 12:15:45 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 452DD6109F for ; Thu, 11 Nov 2021 12:15:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 452DD6109F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:60456 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ml8zY-0004Wj-Dn for qemu-devel@archiver.kernel.org; Thu, 11 Nov 2021 07:15:44 -0500 Received: from eggs.gnu.org ([209.51.188.92]:40250) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ml8t2-00009z-20 for qemu-devel@nongnu.org; Thu, 11 Nov 2021 07:09:01 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:25607) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ml8sz-000377-6o for qemu-devel@nongnu.org; Thu, 11 Nov 2021 07:08:59 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1636632535; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=H0DBrXhYuq69qzyEzXx2sq+C3X1Trt3RY1zSE6P2mN8=; b=P8wNxsNUqAvr/r+uqEjlhENgl6NyPzvEpmW1jNAdBQwTWfpuviFwIXQ3DXlkw2DCzoxxGC kKiFUeotA/aqIsoUHSKc9x4EXZuPCMSY6y+weELV9GKk9UFHRTPtMAEmDNSqc5ZFixc3bC 5dVcSMfV27ZrJaCaC+9IDlaZZBL4GFo= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-414-pYCJay2aN16MgjzAI2MGJg-1; Thu, 11 Nov 2021 07:08:52 -0500 X-MC-Unique: pYCJay2aN16MgjzAI2MGJg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8888981C85D; Thu, 11 Nov 2021 12:08:51 +0000 (UTC) Received: from localhost (unknown [10.39.193.142]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2DC7B67842; Thu, 11 Nov 2021 12:08:51 +0000 (UTC) From: Hanna Reitz To: qemu-block@nongnu.org Subject: [PATCH v2 06/10] block: Restructure remove_file_or_backing_child() Date: Thu, 11 Nov 2021 13:08:25 +0100 Message-Id: <20211111120829.81329-7-hreitz@redhat.com> In-Reply-To: <20211111120829.81329-1-hreitz@redhat.com> References: <20211111120829.81329-1-hreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=hreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=hreitz@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.7, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, 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: , Cc: Kevin Wolf , Hanna Reitz , Vladimir Sementsov-Ogievskiy , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" As of a future patch, bdrv_replace_child_tran() will take a BdrvChild ** pointer. Prepare for that by getting such a pointer and using it where applicable, and (dereferenced) as a parameter for bdrv_replace_child_tran(). Signed-off-by: Hanna Reitz Reviewed-by: Vladimir Sementsov-Ogievskiy --- block.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/block.c b/block.c index d668156eca..8da057f800 100644 --- a/block.c +++ b/block.c @@ -4887,30 +4887,33 @@ static void bdrv_remove_file_or_backing_child(BlockDriverState *bs, BdrvChild *child, Transaction *tran) { + BdrvChild **childp; BdrvRemoveFilterOrCowChild *s; - assert(child == bs->backing || child == bs->file); - if (!child) { return; } + if (child == bs->backing) { + childp = &bs->backing; + } else if (child == bs->file) { + childp = &bs->file; + } else { + g_assert_not_reached(); + } + if (child->bs) { - bdrv_replace_child_tran(child, NULL, tran); + bdrv_replace_child_tran(*childp, NULL, tran); } s = g_new(BdrvRemoveFilterOrCowChild, 1); *s = (BdrvRemoveFilterOrCowChild) { .child = child, - .is_backing = (child == bs->backing), + .is_backing = (childp == &bs->backing), }; tran_add(tran, &bdrv_remove_filter_or_cow_child_drv, s); - if (s->is_backing) { - bs->backing = NULL; - } else { - bs->file = NULL; - } + *childp = NULL; } /*