This is a small step in preparation to mark bdrv_drained_begin() as
GRAPH_UNLOCKED. More concretely, it is in preparation to move the
drain out of bdrv_change_aio_context() and marking that function as
GRAPH_RDLOCK.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
---
 include/block/block-global-state.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/block/block-global-state.h b/include/block/block-global-state.h
index 9be34b3c99..aad160956a 100644
--- a/include/block/block-global-state.h
+++ b/include/block/block-global-state.h
@@ -274,9 +274,10 @@ int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
 int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
 
-bool bdrv_child_change_aio_context(BdrvChild *c, AioContext *ctx,
-                                   GHashTable *visited, Transaction *tran,
-                                   Error **errp);
+bool GRAPH_RDLOCK
+bdrv_child_change_aio_context(BdrvChild *c, AioContext *ctx,
+                              GHashTable *visited, Transaction *tran,
+                              Error **errp);
 int bdrv_try_change_aio_context(BlockDriverState *bs, AioContext *ctx,
                                 BdrvChild *ignore_child, Error **errp);
 
-- 
2.39.5