From patchwork Fri Feb 3 15:21:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 13128066 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 22C40C61DA4 for ; Fri, 3 Feb 2023 15:27:40 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pNxtn-0007LM-Sm; Fri, 03 Feb 2023 10:22:47 -0500 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 1pNxtl-0007K7-Oq for qemu-devel@nongnu.org; Fri, 03 Feb 2023 10:22:45 -0500 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 1pNxtk-0005HV-5P for qemu-devel@nongnu.org; Fri, 03 Feb 2023 10:22:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1675437763; 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=6AGJvzJuHKjnpX3gwR+d/ibfUFVOLm8YnZQqQotE9mk=; b=JYpeNIzkWKcBox+vHTOCpN7o1y95esqCBb4eLLTiTdvHwIAkGKo0PDuCqywcH3SlfIIZRI SCO8+QDjwDilFyx0HwACP0pyMwMkeN5oefH9RFwhzBl1/JAjaYA3TVBrtSTYf4Ba8P+viB Edb/e16Spz98JCZg/xr1CMT4O8RZjF4= 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-500-7qaoG_ZRNembhY-R-EhmUA-1; Fri, 03 Feb 2023 10:22:39 -0500 X-MC-Unique: 7qaoG_ZRNembhY-R-EhmUA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8C26985A5B1; Fri, 3 Feb 2023 15:22:39 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.39.194.116]) by smtp.corp.redhat.com (Postfix) with ESMTP id 924E9410B1AD; Fri, 3 Feb 2023 15:22:38 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, pbonzini@redhat.com, stefanha@redhat.com, eesposit@redhat.com, qemu-devel@nongnu.org Subject: [PATCH 05/23] block: Mark bdrv_co_ioctl() and callers GRAPH_RDLOCK Date: Fri, 3 Feb 2023 16:21:44 +0100 Message-Id: <20230203152202.49054-6-kwolf@redhat.com> In-Reply-To: <20230203152202.49054-1-kwolf@redhat.com> References: <20230203152202.49054-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 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: -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_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_co_ioctl() need to hold a reader lock for the graph. Signed-off-by: Kevin Wolf --- include/block/block-io.h | 3 ++- include/block/block_int-common.h | 9 +++++---- block/block-backend.c | 1 + block/io.c | 1 + block/raw-format.c | 4 ++-- 5 files changed, 11 insertions(+), 7 deletions(-) diff --git a/include/block/block-io.h b/include/block/block-io.h index 6303501b0f..3f42c76f23 100644 --- a/include/block/block-io.h +++ b/include/block/block-io.h @@ -97,7 +97,8 @@ void bdrv_aio_cancel(BlockAIOCB *acb); void bdrv_aio_cancel_async(BlockAIOCB *acb); /* sg packet commands */ -int coroutine_fn bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf); +int coroutine_fn GRAPH_RDLOCK +bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf); /* Ensure contents are flushed to disk. */ int coroutine_fn bdrv_co_flush(BlockDriverState *bs); diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index 5f0104a1af..64700daf38 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -714,11 +714,12 @@ struct BlockDriver { void coroutine_fn (*bdrv_co_lock_medium)(BlockDriverState *bs, bool locked); /* to control generic scsi devices */ - BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs, - unsigned long int req, void *buf, + BlockAIOCB *coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_aio_ioctl)( + BlockDriverState *bs, unsigned long int req, void *buf, BlockCompletionFunc *cb, void *opaque); - int coroutine_fn (*bdrv_co_ioctl)(BlockDriverState *bs, - unsigned long int req, void *buf); + + int coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_ioctl)( + BlockDriverState *bs, unsigned long int req, void *buf); /* * Returns 0 for completed check, -errno for internal errors. diff --git a/block/block-backend.c b/block/block-backend.c index f5d9e3e269..5c731a1c6c 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -1672,6 +1672,7 @@ blk_co_do_ioctl(BlockBackend *blk, unsigned long int req, void *buf) IO_CODE(); blk_wait_while_drained(blk); + GRAPH_RDLOCK_GUARD(); if (!blk_is_available(blk)) { return -ENOMEDIUM; diff --git a/block/io.c b/block/io.c index 68eaa985f5..27a2824c87 100644 --- a/block/io.c +++ b/block/io.c @@ -3080,6 +3080,7 @@ int coroutine_fn bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf) }; BlockAIOCB *acb; IO_CODE(); + assert_bdrv_graph_readable(); bdrv_inc_in_flight(bs); if (!drv || (!drv->bdrv_aio_ioctl && !drv->bdrv_co_ioctl)) { diff --git a/block/raw-format.c b/block/raw-format.c index f39e1f502b..202acb1232 100644 --- a/block/raw-format.c +++ b/block/raw-format.c @@ -415,8 +415,8 @@ static void coroutine_fn raw_co_lock_medium(BlockDriverState *bs, bool locked) bdrv_co_lock_medium(bs->file->bs, locked); } -static int coroutine_fn raw_co_ioctl(BlockDriverState *bs, - unsigned long int req, void *buf) +static int coroutine_fn GRAPH_RDLOCK +raw_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) { BDRVRawState *s = bs->opaque; if (s->offset || s->has_size) {