From patchwork Tue Apr 25 17:31:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 13223585 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 008ACC6FD18 for ; Tue, 25 Apr 2023 17:33:06 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1prMXC-0008KQ-8R; Tue, 25 Apr 2023 13:32:58 -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 1prMWr-00074W-Rg for qemu-devel@nongnu.org; Tue, 25 Apr 2023 13:32:41 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1prMWp-0004M4-7y for qemu-devel@nongnu.org; Tue, 25 Apr 2023 13:32:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1682443954; 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=9j5V4899zaEUbii13wNh//xksGF0atUNQEVr/ORyxuY=; b=FIH66LkyyeukYOw3qfIFEHK/uOjJfnPFKDU4ehk/O7Bq2jQJo5fCXg7P0bAzc2wZBXzDK3 h20QUVQ9WO7BHTT+3wvnNrBgx924X8h0Omu9BOg2VF7PWyVF0AZCESBSLS3zHca6GkT2a7 EgmWitnTqIWslQ2hxxu6i8CXP6vNnaI= 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-182-Tm1XgubiMhOkHj-m3JZ2zQ-1; Tue, 25 Apr 2023 13:32:31 -0400 X-MC-Unique: Tm1XgubiMhOkHj-m3JZ2zQ-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id BF601185A7A7; Tue, 25 Apr 2023 17:32:30 +0000 (UTC) Received: from merkur.redhat.com (unknown [10.39.193.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id C6BE7492B03; Tue, 25 Apr 2023 17:32:29 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com, pbonzini@redhat.com, eesposit@redhat.com, qemu-devel@nongnu.org Subject: [PATCH 19/20] block: Mark bdrv_recurse_can_replace() and callers GRAPH_RDLOCK Date: Tue, 25 Apr 2023 19:31:57 +0200 Message-Id: <20230425173158.574203-20-kwolf@redhat.com> In-Reply-To: <20230425173158.574203-1-kwolf@redhat.com> References: <20230425173158.574203-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 Received-SPF: pass client-ip=170.10.133.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.171, 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, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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_recurse_can_replace() need to hold a reader lock for the graph because it accesses the children list of a node. Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake Reviewed-by: Stefan Hajnoczi --- include/block/block-global-state.h | 5 +++-- include/block/block_int-common.h | 4 ++-- include/block/block_int-global-state.h | 4 ++-- block/blkverify.c | 5 +++-- block/mirror.c | 4 ++++ block/quorum.c | 4 ++-- blockdev.c | 3 +++ 7 files changed, 19 insertions(+), 10 deletions(-) diff --git a/include/block/block-global-state.h b/include/block/block-global-state.h index ec3ddb17a8..f234bca0b6 100644 --- a/include/block/block-global-state.h +++ b/include/block/block-global-state.h @@ -163,8 +163,9 @@ int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, Error **errp); /* check if a named node can be replaced when doing drive-mirror */ -BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, - const char *node_name, Error **errp); +BlockDriverState * GRAPH_RDLOCK +check_to_replace_node(BlockDriverState *parent_bs, const char *node_name, + Error **errp); int no_coroutine_fn bdrv_activate(BlockDriverState *bs, Error **errp); diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index 37d094796e..024ded4fc2 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -217,8 +217,8 @@ struct BlockDriver { * same data as @bs without it affecting @bs's behavior (that is, * without it being visible to @bs's parents). */ - bool (*bdrv_recurse_can_replace)(BlockDriverState *bs, - BlockDriverState *to_replace); + bool GRAPH_RDLOCK_PTR (*bdrv_recurse_can_replace)( + BlockDriverState *bs, BlockDriverState *to_replace); int (*bdrv_probe_device)(const char *filename); diff --git a/include/block/block_int-global-state.h b/include/block/block_int-global-state.h index 902406eb99..da5fb31089 100644 --- a/include/block/block_int-global-state.h +++ b/include/block/block_int-global-state.h @@ -225,8 +225,8 @@ int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, */ int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp); -bool bdrv_recurse_can_replace(BlockDriverState *bs, - BlockDriverState *to_replace); +bool GRAPH_RDLOCK bdrv_recurse_can_replace(BlockDriverState *bs, + BlockDriverState *to_replace); /* * Default implementation for BlockDriver.bdrv_child_perm() that can diff --git a/block/blkverify.c b/block/blkverify.c index 1c16f86b2e..7326461f30 100644 --- a/block/blkverify.c +++ b/block/blkverify.c @@ -265,8 +265,9 @@ static int coroutine_fn GRAPH_RDLOCK blkverify_co_flush(BlockDriverState *bs) return bdrv_co_flush(s->test_file->bs); } -static bool blkverify_recurse_can_replace(BlockDriverState *bs, - BlockDriverState *to_replace) +static bool GRAPH_RDLOCK +blkverify_recurse_can_replace(BlockDriverState *bs, + BlockDriverState *to_replace) { BDRVBlkverifyState *s = bs->opaque; diff --git a/block/mirror.c b/block/mirror.c index a2f46783cf..99409f893f 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -747,7 +747,10 @@ static int mirror_exit_common(Job *job) * Cannot use check_to_replace_node() here, because that would * check for an op blocker on @to_replace, and we have our own * there. + * + * TODO Pull out the writer lock from bdrv_replace_node() to here */ + bdrv_graph_rdlock_main_loop(); if (bdrv_recurse_can_replace(src, to_replace)) { bdrv_replace_node(to_replace, target_bs, &local_err); } else { @@ -756,6 +759,7 @@ static int mirror_exit_common(Job *job) "would not lead to an abrupt change of visible data", to_replace->node_name, target_bs->node_name); } + bdrv_graph_rdunlock_main_loop(); bdrv_drained_end(target_bs); if (local_err) { error_report_err(local_err); diff --git a/block/quorum.c b/block/quorum.c index ff5a0a2da3..f28758cf2b 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -825,8 +825,8 @@ static coroutine_fn GRAPH_RDLOCK int quorum_co_flush(BlockDriverState *bs) return result; } -static bool quorum_recurse_can_replace(BlockDriverState *bs, - BlockDriverState *to_replace) +static bool GRAPH_RDLOCK +quorum_recurse_can_replace(BlockDriverState *bs, BlockDriverState *to_replace) { BDRVQuorumState *s = bs->opaque; int i; diff --git a/blockdev.c b/blockdev.c index eb509cf964..bfca91ee4e 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2951,6 +2951,9 @@ static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs, BlockDriverState *unfiltered_bs; int job_flags = JOB_DEFAULT; + GLOBAL_STATE_CODE(); + GRAPH_RDLOCK_GUARD_MAINLOOP(); + if (!has_speed) { speed = 0; }