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bh=l1NnzZCowBmuKNuYhNQ8vcJ+qQQyuvECyRw+quTAl98=; b=OvXlDlzh43I79ILx0iCkbsZ8bfMLw1wKAPAE64g6PW+9ze5NiYfyO+lvECohPzEW3f28tT AXwpvKxZbTBB9YmBkuNe5XPdB/cKWgjXsobRDsrIFBGB00qKp5lSKQft0VE2ZQAbMmZ1Us 1AiIyPUUWsoSaC4m/2Iq4x7puMpSqxc= X-MC-Unique: IFYSMD3qO3KOmjuVM5ktaA-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 03/24] block: Mark bdrv_filter_bs() and callers GRAPH_RDLOCK Date: Fri, 27 Oct 2023 17:53:12 +0200 Message-ID: <20231027155333.420094-4-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, T_SPF_TEMPERROR=0.01 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: 1698422096593100002 Content-Type: text/plain; charset="utf-8" This adds GRAPH_RDLOCK annotations to declare that callers of bdrv_filter_bs() need to hold a reader lock for the graph because it calls bdrv_filter_child(), which accesses bs->file/backing. Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake --- include/block/block-io.h | 2 +- include/block/block_int-io.h | 3 ++- block.c | 9 +++++++-- block/stream.c | 2 ++ migration/block-dirty-bitmap.c | 4 ++++ 5 files changed, 16 insertions(+), 4 deletions(-) diff --git a/include/block/block-io.h b/include/block/block-io.h index ad270b6ad2..58c4cf50a0 100644 --- a/include/block/block-io.h +++ b/include/block/block-io.h @@ -183,7 +183,7 @@ bdrv_co_eject(BlockDriverState *bs, bool eject_flag); =20 const char *bdrv_get_format_name(BlockDriverState *bs); =20 -bool bdrv_supports_compressed_writes(BlockDriverState *bs); +bool GRAPH_RDLOCK bdrv_supports_compressed_writes(BlockDriverState *bs); const char *bdrv_get_node_name(const BlockDriverState *bs); =20 const char * GRAPH_RDLOCK diff --git a/include/block/block_int-io.h b/include/block/block_int-io.h index 34eac72d7a..26bff94e4e 100644 --- a/include/block/block_int-io.h +++ b/include/block/block_int-io.h @@ -143,7 +143,8 @@ static inline BlockDriverState *bdrv_cow_bs(BlockDriver= State *bs) return child_bs(bdrv_cow_child(bs)); } =20 -static inline BlockDriverState *bdrv_filter_bs(BlockDriverState *bs) +static inline BlockDriverState * GRAPH_RDLOCK +bdrv_filter_bs(BlockDriverState *bs) { IO_CODE(); return child_bs(bdrv_filter_child(bs)); diff --git a/block.c b/block.c index 1171f47570..d85738b7dc 100644 --- a/block.c +++ b/block.c @@ -820,12 +820,17 @@ int bdrv_probe_blocksizes(BlockDriverState *bs, Block= Sizes *bsz) int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) { BlockDriver *drv =3D bs->drv; - BlockDriverState *filtered =3D bdrv_filter_bs(bs); + BlockDriverState *filtered; + GLOBAL_STATE_CODE(); + GRAPH_RDLOCK_GUARD_MAINLOOP(); =20 if (drv && drv->bdrv_probe_geometry) { return drv->bdrv_probe_geometry(bs, geo); - } else if (filtered) { + } + + filtered =3D bdrv_filter_bs(bs); + if (filtered) { return bdrv_probe_geometry(filtered, geo); } =20 diff --git a/block/stream.c b/block/stream.c index ddaab7dbbd..b22d9c236b 100644 --- a/block/stream.c +++ b/block/stream.c @@ -268,6 +268,8 @@ void stream_start(const char *job_id, BlockDriverState = *bs, assert(!bottom->drv->is_filter); base_overlay =3D above_base =3D bottom; } else { + GRAPH_RDLOCK_GUARD_MAINLOOP(); + base_overlay =3D bdrv_find_overlay(bs, base); if (!base_overlay) { error_setg(errp, "'%s' is not in the backing chain of '%s'", diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c index 03cb2e72ee..24347ab0f7 100644 --- a/migration/block-dirty-bitmap.c +++ b/migration/block-dirty-bitmap.c @@ -607,6 +607,10 @@ static int init_dirty_bitmap_migration(DBMSaveState *s) BlockBackend *blk; GHashTable *alias_map =3D NULL; =20 + /* Runs in the migration thread, but holds the iothread lock */ + GLOBAL_STATE_CODE(); + GRAPH_RDLOCK_GUARD_MAINLOOP(); + if (migrate_has_block_bitmap_mapping()) { alias_map =3D construct_alias_map(migrate_block_bitmap_mapping(), = true, &error_abort); --=20 2.41.0