From patchwork Fri Sep 15 14:43:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 13387113 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id DF97EEEB596 for ; Fri, 15 Sep 2023 14:48:20 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qhA3M-0000Fe-32; Fri, 15 Sep 2023 10:44:16 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qhA3C-00009y-88 for qemu-devel@nongnu.org; Fri, 15 Sep 2023 10:44:06 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qhA3A-0004yz-KI for qemu-devel@nongnu.org; Fri, 15 Sep 2023 10:44:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1694789042; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gQUOFlnWfu6bZkZbbxmD78OSzWs56jzvPn0oUS/WOds=; b=KReA5wM1gxn1C79r00ArwDaJ8TccYuv1lLyiIrJlXb1y63pU25aieXzrkXcuhqYG/70KKn BZkKCp4sPILTunFI8vPzLrJSmbwyw+njTB94BFijzxDPRo9EktX7ccXaYeiBIHb5LUQYwi aCYLXtjI9ERNcNK353ELJMIUCSog3JQ= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-329-d6N9eEIWPRu8LKuQO8U_RA-1; Fri, 15 Sep 2023 10:44:01 -0400 X-MC-Unique: d6N9eEIWPRu8LKuQO8U_RA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 18D96955969; Fri, 15 Sep 2023 14:44:01 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.39.193.146]) by smtp.corp.redhat.com (Postfix) with ESMTP id 799E52026D4B; Fri, 15 Sep 2023 14:44:00 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [PULL 15/28] block: Mark bdrv_child_perm() GRAPH_RDLOCK Date: Fri, 15 Sep 2023 16:43:31 +0200 Message-ID: <20230915144344.238596-16-kwolf@redhat.com> In-Reply-To: <20230915144344.238596-1-kwolf@redhat.com> References: <20230915144344.238596-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Received-SPF: pass client-ip=170.10.129.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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_H4=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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org This adds GRAPH_RDLOCK annotations to declare that callers of bdrv_child_perm() need to hold a reader lock for the graph because some implementations access the children list of a node. The callers of bdrv_child_perm() conveniently already hold the lock. Signed-off-by: Kevin Wolf Reviewed-by: Emanuele Giuseppe Esposito Reviewed-by: Stefan Hajnoczi Message-ID: <20230911094620.45040-16-kwolf@redhat.com> Signed-off-by: Kevin Wolf --- include/block/block_int-common.h | 10 +++++----- block.c | 11 ++++++----- block/copy-before-write.c | 10 +++++----- 3 files changed, 16 insertions(+), 15 deletions(-) diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index f82c14fb9c..3feb67ec4a 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -451,11 +451,11 @@ struct BlockDriver { * permissions, but those that will be needed after applying the * @reopen_queue. */ - void (*bdrv_child_perm)(BlockDriverState *bs, BdrvChild *c, - BdrvChildRole role, - BlockReopenQueue *reopen_queue, - uint64_t parent_perm, uint64_t parent_shared, - uint64_t *nperm, uint64_t *nshared); + void GRAPH_RDLOCK_PTR (*bdrv_child_perm)( + BlockDriverState *bs, BdrvChild *c, BdrvChildRole role, + BlockReopenQueue *reopen_queue, + uint64_t parent_perm, uint64_t parent_shared, + uint64_t *nperm, uint64_t *nshared); /** * Register/unregister a buffer for I/O. For example, when the driver is diff --git a/block.c b/block.c index 186efda70f..0f7f78f8de 100644 --- a/block.c +++ b/block.c @@ -2228,11 +2228,12 @@ bdrv_parent_perms_conflict(BlockDriverState *bs, Error **errp) return false; } -static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs, - BdrvChild *c, BdrvChildRole role, - BlockReopenQueue *reopen_queue, - uint64_t parent_perm, uint64_t parent_shared, - uint64_t *nperm, uint64_t *nshared) +static void GRAPH_RDLOCK +bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs, + BdrvChild *c, BdrvChildRole role, + BlockReopenQueue *reopen_queue, + uint64_t parent_perm, uint64_t parent_shared, + uint64_t *nperm, uint64_t *nshared) { assert(bs->drv && bs->drv->bdrv_child_perm); GLOBAL_STATE_CODE(); diff --git a/block/copy-before-write.c b/block/copy-before-write.c index 9a0e2b69d9..aeaff3bb82 100644 --- a/block/copy-before-write.c +++ b/block/copy-before-write.c @@ -341,11 +341,11 @@ static void cbw_refresh_filename(BlockDriverState *bs) bs->file->bs->filename); } -static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c, - BdrvChildRole role, - BlockReopenQueue *reopen_queue, - uint64_t perm, uint64_t shared, - uint64_t *nperm, uint64_t *nshared) +static void GRAPH_RDLOCK +cbw_child_perm(BlockDriverState *bs, BdrvChild *c, BdrvChildRole role, + BlockReopenQueue *reopen_queue, + uint64_t perm, uint64_t shared, + uint64_t *nperm, uint64_t *nshared) { if (!(role & BDRV_CHILD_FILTERED)) { /*