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bh=GSHiPvLprmH/2qeqiJxANVyGdixcF8vjBneMzGkpQhE=; b=hKG1k+pLBEgBSVXmJ5tckPZmpnjVcOufPlIzP6+eNN6Rn2BnPSNnNj3BVh5iR1DYV3iRCm XpwtKuhD58oEN+iiXH9e+0TgqoRlJ2R16kk6XP7unC58OVPBUG1k0iyHQ4QwZuCzK6q8RX WV7o5BvUgWmEsp39xyHep2M/2ltdDyA= X-MC-Unique: ioYdiwjiNWGZ7jn4LM0OhQ-1 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, richard.henderson@linaro.org, qemu-devel@nongnu.org Subject: [PULL 21/28] block: Mark bdrv_co_get_info() and callers GRAPH_RDLOCK Date: Wed, 10 May 2023 14:21:04 +0200 Message-Id: <20230510122111.46566-22-kwolf@redhat.com> In-Reply-To: <20230510122111.46566-1-kwolf@redhat.com> References: <20230510122111.46566-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 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=170.10.129.124; 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1683721497919100005 Content-Type: text/plain; charset="utf-8" From: Emanuele Giuseppe Esposito This adds GRAPH_RDLOCK annotations to declare that callers of bdrv_co_get_info() need to hold a reader lock for the graph. Signed-off-by: Emanuele Giuseppe Esposito Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake Reviewed-by: Stefan Hajnoczi Message-Id: <20230504115750.54437-15-kwolf@redhat.com> Signed-off-by: Kevin Wolf --- include/block/block-io.h | 7 +++++-- include/block/block_int-common.h | 4 ++-- block.c | 2 ++ block/crypto.c | 2 +- block/io.c | 11 +++++------ block/mirror.c | 8 ++++++-- block/raw-format.c | 2 +- 7 files changed, 22 insertions(+), 14 deletions(-) diff --git a/include/block/block-io.h b/include/block/block-io.h index fb2adb31c7..bba7f957e1 100644 --- a/include/block/block-io.h +++ b/include/block/block-io.h @@ -167,8 +167,11 @@ const char *bdrv_get_node_name(const BlockDriverState = *bs); const char *bdrv_get_device_name(const BlockDriverState *bs); const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); =20 -int coroutine_fn bdrv_co_get_info(BlockDriverState *bs, BlockDriverInfo *b= di); -int co_wrapper_mixed bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *= bdi); +int coroutine_fn GRAPH_RDLOCK +bdrv_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); + +int co_wrapper_mixed_bdrv_rdlock +bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); =20 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs, Error **errp); diff --git a/include/block/block_int-common.h b/include/block/block_int-com= mon.h index 6e0365d8f2..ee77903f72 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -699,8 +699,8 @@ struct BlockDriver { BlockDriverState *bs, int64_t offset, int64_t bytes, QEMUIOVector *qiov, size_t qiov_offset); =20 - int coroutine_fn (*bdrv_co_get_info)(BlockDriverState *bs, - BlockDriverInfo *bdi); + int coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_get_info)( + BlockDriverState *bs, BlockDriverInfo *bdi); =20 ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs, Error **errp); diff --git a/block.c b/block.c index 3ccb935950..a6deaf8ad1 100644 --- a/block.c +++ b/block.c @@ -6349,6 +6349,8 @@ int coroutine_fn bdrv_co_get_info(BlockDriverState *b= s, BlockDriverInfo *bdi) int ret; BlockDriver *drv =3D bs->drv; IO_CODE(); + assert_bdrv_graph_readable(); + /* if bs->drv =3D=3D NULL, bs is closed, so there's nothing to do here= */ if (!drv) { return -ENOMEDIUM; diff --git a/block/crypto.c b/block/crypto.c index 8fd3ad0054..30093cff9b 100644 --- a/block/crypto.c +++ b/block/crypto.c @@ -736,7 +736,7 @@ fail: return ret; } =20 -static int coroutine_fn +static int coroutine_fn GRAPH_RDLOCK block_crypto_co_get_info_luks(BlockDriverState *bs, BlockDriverInfo *bdi) { BlockDriverInfo subbdi; diff --git a/block/io.c b/block/io.c index 6fa1993374..3bf9ef9d87 100644 --- a/block/io.c +++ b/block/io.c @@ -727,10 +727,9 @@ BdrvTrackedRequest *coroutine_fn bdrv_co_get_self_requ= est(BlockDriverState *bs) /** * Round a region to cluster boundaries */ -void coroutine_fn bdrv_round_to_clusters(BlockDriverState *bs, - int64_t offset, int64_t bytes, - int64_t *cluster_offset, - int64_t *cluster_bytes) +void coroutine_fn GRAPH_RDLOCK +bdrv_round_to_clusters(BlockDriverState *bs, int64_t offset, int64_t bytes, + int64_t *cluster_offset, int64_t *cluster_bytes) { BlockDriverInfo bdi; IO_CODE(); @@ -744,7 +743,7 @@ void coroutine_fn bdrv_round_to_clusters(BlockDriverSta= te *bs, } } =20 -static coroutine_fn int bdrv_get_cluster_size(BlockDriverState *bs) +static int coroutine_fn GRAPH_RDLOCK bdrv_get_cluster_size(BlockDriverStat= e *bs) { BlockDriverInfo bdi; int ret; @@ -1800,7 +1799,7 @@ fail: return ret; } =20 -static inline int coroutine_fn +static inline int coroutine_fn GRAPH_RDLOCK bdrv_co_write_req_prepare(BdrvChild *child, int64_t offset, int64_t bytes, BdrvTrackedRequest *req, int flags) { diff --git a/block/mirror.c b/block/mirror.c index b5c4ae31f3..e48ed0af31 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -576,8 +576,10 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBl= ockJob *s) } else if (ret >=3D 0 && !(ret & BDRV_BLOCK_DATA)) { int64_t target_offset; int64_t target_bytes; - bdrv_round_to_clusters(blk_bs(s->target), offset, io_bytes, - &target_offset, &target_bytes); + WITH_GRAPH_RDLOCK_GUARD() { + bdrv_round_to_clusters(blk_bs(s->target), offset, io_bytes, + &target_offset, &target_bytes); + } if (target_offset =3D=3D offset && target_bytes =3D=3D io_bytes) { mirror_method =3D ret & BDRV_BLOCK_ZERO ? @@ -966,11 +968,13 @@ static int coroutine_fn mirror_run(Job *job, Error **= errp) */ bdrv_get_backing_filename(target_bs, backing_filename, sizeof(backing_filename)); + bdrv_graph_co_rdlock(); if (!bdrv_co_get_info(target_bs, &bdi) && bdi.cluster_size) { s->target_cluster_size =3D bdi.cluster_size; } else { s->target_cluster_size =3D BDRV_SECTOR_SIZE; } + bdrv_graph_co_rdunlock(); if (backing_filename[0] && !bdrv_backing_chain_next(target_bs) && s->granularity < s->target_cluster_size) { s->buf_size =3D MAX(s->buf_size, s->target_cluster_size); diff --git a/block/raw-format.c b/block/raw-format.c index 06b8030d9d..fd9e61f58e 100644 --- a/block/raw-format.c +++ b/block/raw-format.c @@ -369,7 +369,7 @@ static BlockMeasureInfo *raw_measure(QemuOpts *opts, Bl= ockDriverState *in_bs, return info; } =20 -static int coroutine_fn +static int coroutine_fn GRAPH_RDLOCK raw_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) { return bdrv_co_get_info(bs->file->bs, bdi); --=20 2.40.1