From mboxrd@z Thu Jan 1 00:00:00 1970 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 9C723EE49AE for ; Tue, 22 Aug 2023 19:05:43 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qYWh1-0005o3-U5; Tue, 22 Aug 2023 15:05:31 -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 1qYWh0-0005ns-9F for qemu-devel@nongnu.org; Tue, 22 Aug 2023 15:05:30 -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 1qYWgy-0005hr-7e for qemu-devel@nongnu.org; Tue, 22 Aug 2023 15:05:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1692731127; 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: in-reply-to:in-reply-to:references:references; bh=2i6L3EZPsRg9TU6M1dC94TQn2EmNIzCcGAYQmjfGg1s=; b=Rt1WEvdyY1gKXhyp4DPTMvqqrYmoS3qswKL0+2cPGoB2o/D2exqDKzXbKFLt66FQh8XWCE PABO0vU5VaxNN5LUMkTNDvDHymmSh4CwZQ61nBL7oC24yU3IW8xkDyucu/bqFNh5TLjkR3 nMMiVcF9GvUS8pTp7FQFDF0/fpFuZCY= Received: from mimecast-mx02.redhat.com (66.187.233.73 [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-13-A9KYaa9xMRa8VPHYgIOYdA-1; Tue, 22 Aug 2023 15:05:25 -0400 X-MC-Unique: A9KYaa9xMRa8VPHYgIOYdA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 5A0F63814942; Tue, 22 Aug 2023 19:05:25 +0000 (UTC) Received: from localhost (unknown [10.39.195.69]) by smtp.corp.redhat.com (Postfix) with ESMTP id E67E964661; Tue, 22 Aug 2023 19:05:24 +0000 (UTC) Date: Tue, 22 Aug 2023 15:05:23 -0400 From: Stefan Hajnoczi To: Kevin Wolf Cc: qemu-block@nongnu.org, eblake@redhat.com, eesposit@redhat.com, pbonzini@redhat.com, vsementsov@yandex-team.ru, qemu-devel@nongnu.org Subject: Re: [PATCH 08/21] block: Mark bdrv_replace_child_noperm() GRAPH_WRLOCK Message-ID: <20230822190523.GK727224@fedora> References: <20230817125020.208339-1-kwolf@redhat.com> <20230817125020.208339-9-kwolf@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="jsvuK0DjMmoA5Pd9" Content-Disposition: inline In-Reply-To: <20230817125020.208339-9-kwolf@redhat.com> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Received-SPF: pass client-ip=170.10.129.124; envelope-from=stefanha@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 --jsvuK0DjMmoA5Pd9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Aug 17, 2023 at 02:50:07PM +0200, Kevin Wolf wrote: > Instead of taking the writer lock internally, require callers to already > hold it when calling bdrv_replace_child_noperm(). These callers will > typically already hold the graph lock once the locking work is > completed, which means that they can't call functions that take it > internally. >=20 > Signed-off-by: Kevin Wolf > --- > block.c | 26 +++++++++++++++++++------- > 1 file changed, 19 insertions(+), 7 deletions(-) Reviewed-by: Stefan Hajnoczi --jsvuK0DjMmoA5Pd9 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAmTlBvMACgkQnKSrs4Gr c8hMsggAxEkMDTqAABqlXBgsSZEnryK6K/Dl8loY/Ps9TPbVVE0fIxOX8maowmDD RzCtsdnMDYsU+v5g4MLqxgmvana4hmi9jTbnArr9taVSIDW6iHcpZ5qjfpYQeAvf o8YuxSSImTSBzmug+8EMP5qh+nl23t2AA27bA9YKv7D4b7fQ5AlgWnwR5CsCNiPA jBRvGRUAAlEUD94eWW+9EkZ/cxfuz8yn+2lzwcAsaReDGhxhD2B69oPf6M10rj3g vzjkBe/B8/pSnBXtSSzAvZdrP4qeJiL/UW/vxPkZew4nTeNZowH7fDiIlyUsf7ye hx/8p6nGZNjNDCazkJ1YxQ+s2HPYzg== =HFNr -----END PGP SIGNATURE----- --jsvuK0DjMmoA5Pd9--