From patchwork Wed May 13 11:05:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Max Reitz X-Patchwork-Id: 282869 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=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS 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 D746AC2D0FC for ; Wed, 13 May 2020 11:18:06 +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 A844D206E5 for ; Wed, 13 May 2020 11:18:06 +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="HglEmPK2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A844D206E5 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]:58908 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jYpOn-0004VG-KP for qemu-devel@archiver.kernel.org; Wed, 13 May 2020 07:18:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54728) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jYpDW-0001an-OQ for qemu-devel@nongnu.org; Wed, 13 May 2020 07:06:26 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:38292 helo=us-smtp-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 1jYpDV-0003QZ-Ox for qemu-devel@nongnu.org; Wed, 13 May 2020 07:06:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1589367983; 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=+ppdqD1YxpXBf4Kp6jqKPRqDwoKSCIpRNBkaFcKB2hY=; b=HglEmPK26fNbYWjpcrASCGQJziiieQicPE29/ESUXg1gckyLNxwOOkeZvsWQW/H+EZVkdH lSkiJhZ98k0tSFaskpWXp8SLCJIeLze5X2PiliTgEtVurTxTi+To2cVqCXSWprzAgyDNh/ DlfRa9Ku4XeUfLY4WdqyY7rE78SJqg4= 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-163-4czibvWtO6WrVizePFg9qg-1; Wed, 13 May 2020 07:06:21 -0400 X-MC-Unique: 4czibvWtO6WrVizePFg9qg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 845A819200C2; Wed, 13 May 2020 11:06:20 +0000 (UTC) Received: from localhost (unknown [10.40.193.218]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 1AA1A707CC; Wed, 13 May 2020 11:06:19 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH v4 12/34] block: Unify bdrv_child_cb_attach() Date: Wed, 13 May 2020 13:05:22 +0200 Message-Id: <20200513110544.176672-13-mreitz@redhat.com> In-Reply-To: <20200513110544.176672-1-mreitz@redhat.com> References: <20200513110544.176672-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.120; envelope-from=mreitz@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/13 03:05:18 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_H2=-0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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 , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Make bdrv_child_cb_attach() call bdrv_backing_attach() for children with a COW role (and drop the reverse call from bdrv_backing_attach()), so it can be used for any child (with a proper role set). Because so far no child has a proper role set, we need a temporary new callback for child_backing.attach that ensures bdrv_backing_attach() is called for all COW children that do not have their role set yet. (Also, move bdrv_child_cb_attach() down to group it with bdrv_inherited_options().) Signed-off-by: Max Reitz --- block.c | 27 ++++++++++++++++++++------- 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/block.c b/block.c index b3b978a092..755704a54c 100644 --- a/block.c +++ b/block.c @@ -84,6 +84,7 @@ static BlockDriverState *bdrv_open_inherit(const char *filename, static void bdrv_inherited_options(BdrvChildRole role, bool parent_is_format, int *child_flags, QDict *child_options, int parent_flags, QDict *parent_options); +static void bdrv_child_cb_attach(BdrvChild *child); /* If non-zero, use only whitelisted block drivers */ static int use_bdrv_whitelist; @@ -1099,12 +1100,6 @@ static void bdrv_child_cb_drained_end(BdrvChild *child, bdrv_drained_end_no_poll(bs, drained_end_counter); } -static void bdrv_child_cb_attach(BdrvChild *child) -{ - BlockDriverState *bs = child->opaque; - bdrv_apply_subtree_drain(child, bs); -} - static void bdrv_child_cb_detach(BdrvChild *child) { BlockDriverState *bs = child->opaque; @@ -1252,7 +1247,14 @@ static void bdrv_backing_attach(BdrvChild *c) parent->backing_blocker); bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_TARGET, parent->backing_blocker); +} +/* XXX: Will be removed along with child_backing */ +static void bdrv_child_cb_attach_backing(BdrvChild *c) +{ + if (!(c->role & BDRV_CHILD_COW)) { + bdrv_backing_attach(c); + } bdrv_child_cb_attach(c); } @@ -1311,7 +1313,7 @@ static int bdrv_backing_update_filename(BdrvChild *c, BlockDriverState *base, const BdrvChildClass child_backing = { .parent_is_bds = true, .get_parent_desc = bdrv_child_get_parent_desc, - .attach = bdrv_backing_attach, + .attach = bdrv_child_cb_attach_backing, .detach = bdrv_backing_detach, .inherit_options = bdrv_backing_options, .drained_begin = bdrv_child_cb_drained_begin, @@ -1403,6 +1405,17 @@ static void bdrv_inherited_options(BdrvChildRole role, bool parent_is_format, *child_flags = flags; } +static void bdrv_child_cb_attach(BdrvChild *child) +{ + BlockDriverState *bs = child->opaque; + + if (child->role & BDRV_CHILD_COW) { + bdrv_backing_attach(child); + } + + bdrv_apply_subtree_drain(child, bs); +} + static int bdrv_open_flags(BlockDriverState *bs, int flags) { int open_flags = flags;