All of bdrv_drain_all_begin(), bdrv_drain_all() and
bdrv_drained_begin() poll and are not allowed to be called with the
block graph lock held. Mark the function as such.

Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---
 include/block/block-global-state.h | 4 ++--
 include/block/block-io.h           | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/block/block-global-state.h b/include/block/block-global-state.h
index 91f249b5ad..84a2a4ecd5 100644
--- a/include/block/block-global-state.h
+++ b/include/block/block-global-state.h
@@ -192,10 +192,10 @@ int bdrv_inactivate_all(void);
 
 int bdrv_flush_all(void);
 void bdrv_close_all(void);
-void bdrv_drain_all_begin(void);
+void GRAPH_UNLOCKED bdrv_drain_all_begin(void);
 void bdrv_drain_all_begin_nopoll(void);
 void bdrv_drain_all_end(void);
-void bdrv_drain_all(void);
+void GRAPH_UNLOCKED bdrv_drain_all(void);
 
 void bdrv_aio_cancel(BlockAIOCB *acb);
 
diff --git a/include/block/block-io.h b/include/block/block-io.h
index b99cc98d26..4cf83fb367 100644
--- a/include/block/block-io.h
+++ b/include/block/block-io.h
@@ -431,7 +431,7 @@ bdrv_drain_poll(BlockDriverState *bs, BdrvChild *ignore_parent,
  *
  * This function can be recursive.
  */
-void bdrv_drained_begin(BlockDriverState *bs);
+void GRAPH_UNLOCKED bdrv_drained_begin(BlockDriverState *bs);
 
 /**
  * bdrv_do_drained_begin_quiesce:
-- 
2.39.5