From patchwork Mon Sep 7 11:09:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 274390 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4522CC433E2 for ; Mon, 7 Sep 2020 11:27:11 +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 C1C87206D4 for ; Mon, 7 Sep 2020 11:27:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="MQSJL33q" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C1C87206D4 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+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:60612 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kFFIj-0004NP-Pw for qemu-devel@archiver.kernel.org; Mon, 07 Sep 2020 07:27:09 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59300) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kFF2e-0003E8-Cp for qemu-devel@nongnu.org; Mon, 07 Sep 2020 07:10:34 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:58798 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kFF2Z-00085I-VO for qemu-devel@nongnu.org; Mon, 07 Sep 2020 07:10:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1599477027; 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=eXRqEwaz9/CRaev7pNSEkTfkEaSpDOW/GtJ7CFtDiOQ=; b=MQSJL33qcR3Rmi0OjVXqNBeH+FINmFfn2Mh3rCc4hB2lwLKN2rwKWZq39CAMB7ZykHpCkt hhhvhCGwCHxq1n5rR5uYR9SXELXnFZ8BAfhZ+2sUAim3uIKeVsKKC+8/178Xpsp0Xn8cp0 5DnCgaLle2g9fQuuMx22x7Xn8/1NjJs= 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-251-DIcNUWTWMJSIzHGA4zPK4g-1; Mon, 07 Sep 2020 07:10:25 -0400 X-MC-Unique: DIcNUWTWMJSIzHGA4zPK4g-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 1057318B9EC1; Mon, 7 Sep 2020 11:10:24 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-114-154.ams2.redhat.com [10.36.114.154]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1DA747E435; Mon, 7 Sep 2020 11:10:22 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PULL 30/64] block: Use bdrv_cow_child() in bdrv_co_truncate() Date: Mon, 7 Sep 2020 13:09:02 +0200 Message-Id: <20200907110936.261684-31-kwolf@redhat.com> In-Reply-To: <20200907110936.261684-1-kwolf@redhat.com> References: <20200907110936.261684-1-kwolf@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=kwolf@redhat.com X-Mimecast-Spam-Score: 0.0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.81; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/06 22:29:02 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.1, 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=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: kwolf@redhat.com, peter.maydell@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Max Reitz The condition modified here is not about potentially filtered children, but only about COW sources (i.e. traditional backing files). Signed-off-by: Max Reitz Reviewed-by: Andrey Shinkevich Reviewed-by: Kevin Wolf --- block/io.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/block/io.c b/block/io.c index 4ee8fe5465..6f9402117e 100644 --- a/block/io.c +++ b/block/io.c @@ -3310,7 +3310,7 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact, Error **errp) { BlockDriverState *bs = child->bs; - BdrvChild *filtered; + BdrvChild *filtered, *backing; BlockDriver *drv = bs->drv; BdrvTrackedRequest req; int64_t old_size, new_bytes; @@ -3363,6 +3363,7 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact, } filtered = bdrv_filter_child(bs); + backing = bdrv_cow_child(bs); /* * If the image has a backing file that is large enough that it would @@ -3374,10 +3375,10 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact, * backing file, taking care of keeping things consistent with that backing * file is the user's responsibility. */ - if (new_bytes && bs->backing) { + if (new_bytes && backing) { int64_t backing_len; - backing_len = bdrv_getlength(backing_bs(bs)); + backing_len = bdrv_getlength(backing->bs); if (backing_len < 0) { ret = backing_len; error_setg_errno(errp, -ret, "Could not get backing file size");