From patchwork Wed Nov 16 13:48:43 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: 13045271 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 36466C4332F for ; Wed, 16 Nov 2022 14:02:34 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ovImv-0000kE-I1; Wed, 16 Nov 2022 08:49:13 -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 1ovImp-0000fT-DJ for qemu-devel@nongnu.org; Wed, 16 Nov 2022 08:49:07 -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-000810-2G for qemu-devel@nongnu.org; Wed, 16 Nov 2022 08:49:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1668606540; 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=Yinl0pSM3o2c/4hIiFf86CIDWq3Dli2+EqExA1nqS7M=; b=WzpcMUT9LKixGF3iPYvxaiJwCqKh8ZrB2gQJ4HmLZXe8Ga+Xfw9Da5b/M38eXmSvaDumQU Qc6ILhWGbpJYu091m/0ES5tRcl2OoUzzVME9fNCBEsOxrHpzZzR2ba/pj2eHMzGZT4MZ/d pvsBhwnXp6OnosDjc/wzCyL5VO6+bfE= 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-496-bV-QpyNvM_KvbUuP-8PLAw-1; Wed, 16 Nov 2022 08:48:57 -0500 X-MC-Unique: bV-QpyNvM_KvbUuP-8PLAw-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 B5B94101A52A; Wed, 16 Nov 2022 13:48:56 +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 669494A9268; Wed, 16 Nov 2022 13:48:56 +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 13/20] block-gen: assert that bdrv_co_pwrite_{zeros/sync} is always called with graph rdlock taken Date: Wed, 16 Nov 2022 08:48:43 -0500 Message-Id: <20221116134850.3051419-14-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=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 Already protected by bdrv_co_pwrite callers. Protecting bdrv_co_do_pwrite_zeroes() implies that BlockDriver->bdrv_co_pwrite_zeroes() is always called with graph rdlock taken. Signed-off-by: Emanuele Giuseppe Esposito --- block/io.c | 3 +++ include/block/block_int-common.h | 2 ++ 2 files changed, 5 insertions(+) diff --git a/block/io.c b/block/io.c index 9280fb9f38..92c74648fb 100644 --- a/block/io.c +++ b/block/io.c @@ -904,6 +904,7 @@ int coroutine_fn bdrv_co_pwrite_sync(BdrvChild *child, int64_t offset, { int ret; IO_CODE(); + assert_bdrv_graph_readable(); ret = bdrv_co_pwrite(child, offset, bytes, buf, flags); if (ret < 0) { @@ -1660,6 +1661,7 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs, bs->bl.request_alignment); int max_transfer = MIN_NON_ZERO(bs->bl.max_transfer, MAX_BOUNCE_BUFFER); + assert_bdrv_graph_readable(); bdrv_check_request(offset, bytes, &error_abort); if (!drv) { @@ -2124,6 +2126,7 @@ int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset, { IO_CODE(); trace_bdrv_co_pwrite_zeroes(child->bs, offset, bytes, flags); + assert_bdrv_graph_readable(); if (!(child->bs->open_flags & BDRV_O_UNMAP)) { flags &= ~BDRV_REQ_MAY_UNMAP; diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index d44f825d95..e8d2e4b6c7 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -549,6 +549,8 @@ struct BlockDriver { * would use a compact metadata representation to implement this. This * function pointer may be NULL or return -ENOSUP and .bdrv_co_writev() * will be called instead. + * + * Called with graph rdlock taken. */ int coroutine_fn (*bdrv_co_pwrite_zeroes)(BlockDriverState *bs, int64_t offset, int64_t bytes, BdrvRequestFlags flags);