From nobody Sun Apr 13 19:22:23 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1630510722191567.8258049900807; Wed, 1 Sep 2021 08:38:42 -0700 (PDT) Received: from localhost ([::1]:45874 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mLSK1-0006UL-3d for importer@patchew.org; Wed, 01 Sep 2021 11:38:41 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49598) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mLRzD-0004fy-Rb for qemu-devel@nongnu.org; Wed, 01 Sep 2021 11:17:11 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:55670) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mLRzB-0003cQ-00 for qemu-devel@nongnu.org; Wed, 01 Sep 2021 11:17:11 -0400 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-564-5ro6mnzQOWiQYZ8DcrptGQ-1; Wed, 01 Sep 2021 11:17:06 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D7D39802921; Wed, 1 Sep 2021 15:17:05 +0000 (UTC) Received: from localhost (unknown [10.39.193.250]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 8327A5C23A; Wed, 1 Sep 2021 15:17:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1630509428; 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=J3Wzs6PgdR5xFLD7xKbCyaLcwPJaATPbnIu6vqV2Zps=; b=ANjfiOqmJ4LLNSowFLDGJZnp2vp1vXaorK8XDLqvnBEVFndsVZUJvBoDm4mH6vDoLFYU8M 6GPfzxvceNQyz9UCEfrAdaFclV1M0dWR8Ge7RfuNXGpR6QX/KLG8o9MNV0vtgVV+xJ4tJo CHlHRba4oo5j51QxDHh5w+S87InKolk= X-MC-Unique: 5ro6mnzQOWiQYZ8DcrptGQ-1 From: Hanna Reitz To: qemu-block@nongnu.org Subject: [PULL 21/56] block: introduce bdrv_replace_child_bs() Date: Wed, 1 Sep 2021 17:15:44 +0200 Message-Id: <20210901151619.689075-22-hreitz@redhat.com> In-Reply-To: <20210901151619.689075-1-hreitz@redhat.com> References: <20210901151619.689075-1-hreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 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 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.392, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Peter Maydell , Hanna Reitz , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1630510723093100001 Content-Type: text/plain; charset="utf-8" From: Vladimir Sementsov-Ogievskiy Add function to transactionally replace bs inside BdrvChild. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Max Reitz Message-Id: <20210824083856.17408-2-vsementsov@virtuozzo.com> Signed-off-by: Hanna Reitz --- include/block/block.h | 2 ++ block.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/include/block/block.h b/include/block/block.h index 3477290f9a..740038a892 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -361,6 +361,8 @@ int bdrv_append(BlockDriverState *bs_new, BlockDriverSt= ate *bs_top, Error **errp); int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, Error **errp); +int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs, + Error **errp); BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *node_optio= ns, int flags, Error **errp); int bdrv_drop_filter(BlockDriverState *bs, Error **errp); diff --git a/block.c b/block.c index e97ce0b1c8..b2b66263f9 100644 --- a/block.c +++ b/block.c @@ -5048,6 +5048,37 @@ out: return ret; } =20 +/* Not for empty child */ +int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs, + Error **errp) +{ + int ret; + Transaction *tran =3D tran_new(); + g_autoptr(GHashTable) found =3D NULL; + g_autoptr(GSList) refresh_list =3D NULL; + BlockDriverState *old_bs =3D child->bs; + + bdrv_ref(old_bs); + bdrv_drained_begin(old_bs); + bdrv_drained_begin(new_bs); + + bdrv_replace_child_tran(child, new_bs, tran); + + found =3D g_hash_table_new(NULL, NULL); + refresh_list =3D bdrv_topological_dfs(refresh_list, found, old_bs); + refresh_list =3D bdrv_topological_dfs(refresh_list, found, new_bs); + + ret =3D bdrv_list_refresh_perms(refresh_list, NULL, tran, errp); + + tran_finalize(tran, ret); + + bdrv_drained_end(old_bs); + bdrv_drained_end(new_bs); + bdrv_unref(old_bs); + + return ret; +} + static void bdrv_delete(BlockDriverState *bs) { assert(bdrv_op_blocker_is_empty(bs)); --=20 2.31.1