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bh=zmykzKGDTM60uTLw15UVHmArE36P5/BF9ibO3Bz0LpI=; b=Yn8lNqkHFVnR3W7D6ecRQPCmB+0riRtTCTjJoKoILqeAznolDy+DDNCcRWhGbrmVgGa9uO WiyFTh2gGzD05/IlCV06Yrubmpst7XFiPs3Z15kxMC8a4NK5poWjPchAcfwYz1zuC4wEYr 63C8ZkIcULvGihp9ZqX5cjMgR+cAbt8= X-MC-Unique: erNe8_dEMQW2RWfzx7tcdA-1 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 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1698422096583100001 Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Eric Blake --- 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-globa= l-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, AioCon= text *ctx, int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx, BdrvChild *ignore_child, Error **errp); =20 -int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); +int GRAPH_RDLOCK bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *b= sz); int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); =20 void GRAPH_WRLOCK diff --git a/include/block/block_int-common.h b/include/block/block_int-com= mon.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; } =20 -static int raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) +static int GRAPH_RDLOCK +raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) { BDRVRawState *s =3D bs->opaque; int ret; --=20 2.41.0