block: Mark bdrv_get_xdbg_block_graph() and callers GRAPH_RDLOCK

This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_get_xdbg_block_graph() need to hold a reader lock for the graph
because it accesses the children list of a node.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230929145157.45443-10-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/blockdev.c b/blockdev.c
index 43e0c4d..ff5ee9f 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2846,6 +2846,8 @@ BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
 
 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
 {
+    GRAPH_RDLOCK_GUARD_MAINLOOP();
+
     return bdrv_get_xdbg_block_graph(errp);
 }