block: Mark bdrv_*_dirty_bitmap() and callers GRAPH_RDLOCK

This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_*_dirty_bitmap() need to hold a reader lock for the graph.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230203152202.49054-23-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block/dirty-bitmap.c

@@ -394,6 +394,7 @@ int coroutine_fn
 bdrv_co_remove_persistent_dirty_bitmap(BlockDriverState *bs, const char *name,
                                        Error **errp)
 {
+    assert_bdrv_graph_readable();
     if (bs->drv && bs->drv->bdrv_co_remove_persistent_dirty_bitmap) {
         return bs->drv->bdrv_co_remove_persistent_dirty_bitmap(bs, name, errp);
     }
@@ -415,6 +416,7 @@ bdrv_co_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name,
                                    uint32_t granularity, Error **errp)
 {
     BlockDriver *drv = bs->drv;
+    assert_bdrv_graph_readable();
 
     if (!drv) {
         error_setg_errno(errp, ENOMEDIUM,

include/block/block-io.h

@@ -243,14 +243,12 @@ AioContext *child_of_bds_get_parent_aio_context(BdrvChild *c);
 void coroutine_fn GRAPH_RDLOCK bdrv_co_io_plug(BlockDriverState *bs);
 void coroutine_fn GRAPH_RDLOCK bdrv_co_io_unplug(BlockDriverState *bs);
 
-bool coroutine_fn bdrv_co_can_store_new_dirty_bitmap(BlockDriverState *bs,
-                                                     const char *name,
-                                                     uint32_t granularity,
-                                                     Error **errp);
-bool co_wrapper bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs,
-                                                const char *name,
-                                                uint32_t granularity,
-                                                Error **errp);
+bool coroutine_fn GRAPH_RDLOCK
+bdrv_co_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name,
+                                   uint32_t granularity, Error **errp);
+bool co_wrapper_bdrv_rdlock
+bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name,
+                                uint32_t granularity, Error **errp);
 
 /**
  *

include/block/block_int-common.h

@@ -759,10 +759,12 @@ struct BlockDriver {
     void (*bdrv_drain_end)(BlockDriverState *bs);
 
     bool (*bdrv_supports_persistent_dirty_bitmap)(BlockDriverState *bs);
-    bool coroutine_fn (*bdrv_co_can_store_new_dirty_bitmap)(
+
+    bool coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_can_store_new_dirty_bitmap)(
         BlockDriverState *bs, const char *name, uint32_t granularity,
         Error **errp);
-    int coroutine_fn (*bdrv_co_remove_persistent_dirty_bitmap)(
+
+    int coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_remove_persistent_dirty_bitmap)(
         BlockDriverState *bs, const char *name, Error **errp);
 };
 

include/block/dirty-bitmap.h

@@ -36,12 +36,12 @@ int bdrv_dirty_bitmap_check(const BdrvDirtyBitmap *bitmap, uint32_t flags,
 void bdrv_release_dirty_bitmap(BdrvDirtyBitmap *bitmap);
 void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs);
 
-int coroutine_fn bdrv_co_remove_persistent_dirty_bitmap(BlockDriverState *bs,
-                                                        const char *name,
-                                                        Error **errp);
-int co_wrapper bdrv_remove_persistent_dirty_bitmap(BlockDriverState *bs,
-                                                   const char *name,
-                                                   Error **errp);
+int coroutine_fn GRAPH_RDLOCK
+bdrv_co_remove_persistent_dirty_bitmap(BlockDriverState *bs, const char *name,
+                                       Error **errp);
+int co_wrapper_bdrv_rdlock
+bdrv_remove_persistent_dirty_bitmap(BlockDriverState *bs, const char *name,
+                                    Error **errp);
 
 void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
 void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap);