From patchwork Thu Oct 12 16:22:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 13419448 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 B7E83C41513 for ; Thu, 12 Oct 2023 16:30:45 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qqySt-0003eD-T4; Thu, 12 Oct 2023 12:23:11 -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 1qqySn-0003ZU-RS for qemu-devel@nongnu.org; Thu, 12 Oct 2023 12:23:06 -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 1qqySb-0000cV-2w for qemu-devel@nongnu.org; Thu, 12 Oct 2023 12:23:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1697127772; 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=mOV6fJn+msZVBLGGAlpHzUoM8g5FvZqvqLjSl8X/e0g=; b=Jdx8Ma12JxM2JtN/FtQx8Nq2OwDqbzOGZpR4Gt6hXOotchqL24P/5Xo2a1Z6gy/X2WpkFw nUUDi1kBjHLy16YbAykDlveyR7jCAUJQIrVZFhQli72Mczn0iLKVbYIojLxscFYqiLrix5 7nhMXmpdQccKvhyoFg640E3iwtKS7JA= 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-281-Hw65bSAlNpeiucGn2Di8rA-1; Thu, 12 Oct 2023 12:22:41 -0400 X-MC-Unique: Hw65bSAlNpeiucGn2Di8rA-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 541AE805B31; Thu, 12 Oct 2023 16:22:41 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.39.192.233]) by smtp.corp.redhat.com (Postfix) with ESMTP id B86022026831; Thu, 12 Oct 2023 16:22:40 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [PULL 07/26] block: Take graph rdlock in bdrv_inactivate_all() Date: Thu, 12 Oct 2023 18:22:05 +0200 Message-ID: <20231012162224.240535-8-kwolf@redhat.com> In-Reply-To: <20231012162224.240535-1-kwolf@redhat.com> References: <20231012162224.240535-1-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=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 The function reads the parents list, so it needs to hold the graph lock. Signed-off-by: Kevin Wolf Message-ID: <20230929145157.45443-4-kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- block.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/block.c b/block.c index af04c8ac6f..b62f6f3841 100644 --- a/block.c +++ b/block.c @@ -6976,7 +6976,8 @@ void bdrv_activate_all(Error **errp) } } -static bool bdrv_has_bds_parent(BlockDriverState *bs, bool only_active) +static bool GRAPH_RDLOCK +bdrv_has_bds_parent(BlockDriverState *bs, bool only_active) { BdrvChild *parent; GLOBAL_STATE_CODE(); @@ -6993,14 +6994,13 @@ static bool bdrv_has_bds_parent(BlockDriverState *bs, bool only_active) return false; } -static int bdrv_inactivate_recurse(BlockDriverState *bs) +static int GRAPH_RDLOCK bdrv_inactivate_recurse(BlockDriverState *bs) { BdrvChild *child, *parent; int ret; uint64_t cumulative_perms, cumulative_shared_perms; GLOBAL_STATE_CODE(); - GRAPH_RDLOCK_GUARD_MAINLOOP(); if (!bs->drv) { return -ENOMEDIUM; @@ -7066,6 +7066,7 @@ int bdrv_inactivate_all(void) GSList *aio_ctxs = NULL, *ctx; GLOBAL_STATE_CODE(); + GRAPH_RDLOCK_GUARD_MAINLOOP(); for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { AioContext *aio_context = bdrv_get_aio_context(bs);