From patchwork Fri Oct 27 15:53:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 13455664 Received: from list by lists.gnu.org with archive (Exim 4.90_1) id 1qwP9k-0003U2-DE for mharc-qemu-devel@gnu.org; Fri, 27 Oct 2023 11:53:53 -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 1qwP9h-0003RT-G1 for qemu-devel@nongnu.org; Fri, 27 Oct 2023 11:53:49 -0400 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 1qwP9e-0002Wj-Av for qemu-devel@nongnu.org; Fri, 27 Oct 2023 11:53:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1698422025; 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=zmykzKGDTM60uTLw15UVHmArE36P5/BF9ibO3Bz0LpI=; b=Yn8lNqkHFVnR3W7D6ecRQPCmB+0riRtTCTjJoKoILqeAznolDy+DDNCcRWhGbrmVgGa9uO WiyFTh2gGzD05/IlCV06Yrubmpst7XFiPs3Z15kxMC8a4NK5poWjPchAcfwYz1zuC4wEYr 63C8ZkIcULvGihp9ZqX5cjMgR+cAbt8= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-638-erNe8_dEMQW2RWfzx7tcdA-1; Fri, 27 Oct 2023 11:53:43 -0400 X-MC-Unique: erNe8_dEMQW2RWfzx7tcdA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id EC50B185A785; Fri, 27 Oct 2023 15:53:42 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.39.194.78]) by smtp.corp.redhat.com (Postfix) with ESMTP id BFEB65027; Fri, 27 Oct 2023 15:53:41 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com, eesposit@redhat.com, eblake@redhat.com, pbonzini@redhat.com, vsementsov@yandex-team.ru, qemu-devel@nongnu.org Subject: [PATCH 01/24] block: Mark bdrv_probe_blocksizes() and callers GRAPH_RDLOCK Date: Fri, 27 Oct 2023 17:53:10 +0200 Message-ID: <20231027155333.420094-2-kwolf@redhat.com> In-Reply-To: <20231027155333.420094-1-kwolf@redhat.com> References: <20231027155333.420094-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 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_H3=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: , X-List-Received-Date: Fri, 27 Oct 2023 15:53:50 -0000 This adds GRAPH_RDLOCK annotations to declare that callers of bdrv_probe_blocksizes() need to hold a reader lock for the graph because it calls bdrv_filter_bs(), which accesses bs->file/backing. Signed-off-by: Kevin Wolf --- include/block/block-global-state.h | 2 +- include/block/block_int-common.h | 3 ++- block/block-backend.c | 2 ++ block/raw-format.c | 3 ++- 4 files changed, 7 insertions(+), 3 deletions(-) diff --git a/include/block/block-global-state.h b/include/block/block-global-state.h index 6bfafe781d..fca0a40dbd 100644 --- a/include/block/block-global-state.h +++ b/include/block/block-global-state.h @@ -281,7 +281,7 @@ bool bdrv_child_change_aio_context(BdrvChild *c, AioContext *ctx, int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx, BdrvChild *ignore_child, Error **errp); -int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); +int GRAPH_RDLOCK bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); void GRAPH_WRLOCK diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index b8d9d24f39..8abdd2724b 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -386,7 +386,8 @@ struct BlockDriver { * On success, store them in @bsz and return zero. * On failure, return negative errno. */ - int (*bdrv_probe_blocksizes)(BlockDriverState *bs, BlockSizes *bsz); + int GRAPH_RDLOCK_PTR (*bdrv_probe_blocksizes)( + BlockDriverState *bs, BlockSizes *bsz); /** * Try to get @bs's geometry (cyls, heads, sectors) * On success, store them in @geo and return 0. diff --git a/block/block-backend.c b/block/block-backend.c index 39aac1bbce..53cf3bb8b8 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -2666,6 +2666,8 @@ int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size) int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz) { GLOBAL_STATE_CODE(); + GRAPH_RDLOCK_GUARD_MAINLOOP(); + if (!blk_is_available(blk)) { return -ENOMEDIUM; } diff --git a/block/raw-format.c b/block/raw-format.c index 8ff03adfa4..3fb77b0097 100644 --- a/block/raw-format.c +++ b/block/raw-format.c @@ -543,7 +543,8 @@ static int raw_probe(const uint8_t *buf, int buf_size, const char *filename) return 1; } -static int raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) +static int GRAPH_RDLOCK +raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) { BDRVRawState *s = bs->opaque; int ret;