From patchwork Wed Nov 16 13:48:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emanuele Giuseppe Esposito X-Patchwork-Id: 13045272 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 3C837C4332F for ; Wed, 16 Nov 2022 14:03:12 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ovImt-0000g6-Nj; Wed, 16 Nov 2022 08:49:11 -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 1ovImn-0000cs-1k for qemu-devel@nongnu.org; Wed, 16 Nov 2022 08:49:05 -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 1ovImk-000819-2A for qemu-devel@nongnu.org; Wed, 16 Nov 2022 08:49:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1668606541; 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=YodyfMR91zUtXAX62Pz3ns6A49aC6vibiZQM3eutBso=; b=dbf1ilFy1v0Ri2hrz781pt3VZp5OV1NeK78mcjUPoLQJQL/hG9Y4JuOvWEPSIibmVX7w8D Qpnq0GKU2Nb+a/3dQGDZX3mngTbyC7+J0gHjAPRKPBQAP/bgVvhEFz8k43Si80HRgU1GJK 0AWQ3VM2nYrk/GlBawwqPM9H0vmfTEk= 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-640-K-PADszPPMa6ediZQhQcrw-1; Wed, 16 Nov 2022 08:48:59 -0500 X-MC-Unique: K-PADszPPMa6ediZQhQcrw-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6A8708582B9; Wed, 16 Nov 2022 13:48:59 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1D61C4A9268; Wed, 16 Nov 2022 13:48:59 +0000 (UTC) From: Emanuele Giuseppe Esposito To: qemu-block@nongnu.org Cc: Kevin Wolf , Hanna Reitz , John Snow , Paolo Bonzini , Vladimir Sementsov-Ogievskiy , Stefan Hajnoczi , Fam Zheng , Eric Blake , Cleber Rosa , qemu-devel@nongnu.org, Emanuele Giuseppe Esposito Subject: [PATCH 19/20] block-gen: assert that bdrv_co_ioctl is always called with graph rdlock taken Date: Wed, 16 Nov 2022 08:48:49 -0500 Message-Id: <20221116134850.3051419-20-eesposit@redhat.com> In-Reply-To: <20221116134850.3051419-1-eesposit@redhat.com> References: <20221116134850.3051419-1-eesposit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eesposit@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 The only caller of this function is blk_ioctl, a generated_co_wrapper functions that needs to take the graph read lock. Protecting bdrv_co_ioctl() implies that BlockDriver->bdrv_co_ioctl() is always called with graph rdlock taken, and BlockDriver->bdrv_aio_ioctl is a coroutine_fn callback (called too with rdlock taken). Signed-off-by: Emanuele Giuseppe Esposito --- block/block-backend.c | 1 + block/io.c | 1 + include/block/block_int-common.h | 5 +++-- 3 files changed, 5 insertions(+), 2 deletions(-) diff --git a/block/block-backend.c b/block/block-backend.c index 20b772a476..9e1c689e84 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 c5b3bb0a6d..831f277e85 100644 --- a/block/io.c +++ b/block/io.c @@ -3007,6 +3007,7 @@ 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/include/block/block_int-common.h b/include/block/block_int-common.h index 9d9cd59f1e..db97d61836 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -743,10 +743,11 @@ struct BlockDriver { void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag); void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked); - /* to control generic scsi devices */ - BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs, + /* to control generic scsi devices. Called with graph rdlock taken. */ + BlockAIOCB *coroutine_fn (*bdrv_aio_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf, BlockCompletionFunc *cb, void *opaque); + /* Called with graph rdlock taken. */ int coroutine_fn (*bdrv_co_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);