From patchwork Mon Nov 9 17:38:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Max Reitz X-Patchwork-Id: 11892125 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 54EE56A2 for ; Mon, 9 Nov 2020 17:55:55 +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 06CA12068D for ; Mon, 9 Nov 2020 17:55:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Qlp4k7aI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 06CA12068D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:53810 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kcBOT-0002jJ-Ue for patchwork-qemu-devel@patchwork.kernel.org; Mon, 09 Nov 2020 12:55:53 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:41056) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kcB8S-0006vf-0r for qemu-devel@nongnu.org; Mon, 09 Nov 2020 12:39:20 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:48871) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kcB8Q-0000WA-0i for qemu-devel@nongnu.org; Mon, 09 Nov 2020 12:39:19 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1604943557; 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=j8om9XNSXwWeEA8OUiHk+zMzsBdx8dojGcHQlkoGG6k=; b=Qlp4k7aIlZFMtaUq40OgctVvfGAd8ZbM802u+7ezPiCIVtLvj8k6EvwIuYbnb5ZlQz5qWI iYosRMb3gTLX4/k1on2MY40AktZIa0ta/TK46clBeOKJZUhakYy/dBWYqEXkJKuUkEZIgn cSdLIElwbLfrpa4sFlkJgBbmfkrRyCM= 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-576-MPUVI4TKO6q6sWvR6wu1Bg-1; Mon, 09 Nov 2020 12:39:14 -0500 X-MC-Unique: MPUVI4TKO6q6sWvR6wu1Bg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D0C938CD261; Mon, 9 Nov 2020 17:39:13 +0000 (UTC) Received: from localhost (ovpn-113-179.ams2.redhat.com [10.36.113.179]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 7555260E1C; Mon, 9 Nov 2020 17:39:13 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Subject: [PULL 14/15] block: add bdrv_replace_node_common() Date: Mon, 9 Nov 2020 18:38:38 +0100 Message-Id: <20201109173839.2135984-15-mreitz@redhat.com> In-Reply-To: <20201109173839.2135984-1-mreitz@redhat.com> References: <20201109173839.2135984-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=mreitz@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/09 01:25:23 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: Kevin Wolf , Peter Maydell , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: Vladimir Sementsov-Ogievskiy Add new parameter to bdrv_replace_node(): auto_skip. With auto_skip=false we'll have stricter behavior: update _all_ from parents or fail. New behaviour will be used in the following commit in block.c, so keep original function name as public interface. Note: new error message is a bit funny in contrast with further "Cannot" in case of frozen child, but we'd better keep some difference to make it possible to distinguish one from another on failure. Still, actually we'd better refactor should_update_child() call to distinguish also different kinds of "should not". Let's do it later. Signed-off-by: Vladimir Sementsov-Ogievskiy Message-Id: <20201106124241.16950-3-vsementsov@virtuozzo.com> Reviewed-by: Alberto Garcia Signed-off-by: Max Reitz --- block.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) diff --git a/block.c b/block.c index 1e68bd2f5f..9a945a058d 100644 --- a/block.c +++ b/block.c @@ -4563,8 +4563,16 @@ static bool should_update_child(BdrvChild *c, BlockDriverState *to) return ret; } -void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, - Error **errp) +/* + * With auto_skip=true bdrv_replace_node_common skips updating from parents + * if it creates a parent-child relation loop or if parent is block-job. + * + * With auto_skip=false the error is returned if from has a parent which should + * not be updated. + */ +static void bdrv_replace_node_common(BlockDriverState *from, + BlockDriverState *to, + bool auto_skip, Error **errp) { BdrvChild *c, *next; GSList *list = NULL, *p; @@ -4583,7 +4591,12 @@ void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) { assert(c->bs == from); if (!should_update_child(c, to)) { - continue; + if (auto_skip) { + continue; + } + error_setg(errp, "Should not change '%s' link to '%s'", + c->name, from->node_name); + goto out; } if (c->frozen) { error_setg(errp, "Cannot change '%s' link to '%s'", @@ -4623,6 +4636,12 @@ out: bdrv_unref(from); } +void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, + Error **errp) +{ + return bdrv_replace_node_common(from, to, true, errp); +} + /* * Add new bs contents at the top of an image chain while the chain is * live, while keeping required fields on the top layer.