@@ -604,8 +604,8 @@ static void bdrv_query_blk_stats(BlockDeviceStats *ds, BlockBackend *blk)
= bdrv_latency_histogram_stats(&hgram[BLOCK_ACCT_FLUSH]);
}
-static BlockStats *bdrv_query_bds_stats(BlockDriverState *bs,
- bool blk_level)
+static BlockStats * GRAPH_RDLOCK
+bdrv_query_bds_stats(BlockDriverState *bs, bool blk_level)
{
BdrvChild *parent_child;
BlockDriverState *filter_or_cow_bs;
@@ -713,6 +713,8 @@ BlockStatsList *qmp_query_blockstats(bool has_query_nodes,
BlockBackend *blk;
BlockDriverState *bs;
+ GRAPH_RDLOCK_GUARD_MAINLOOP();
+
/* Just to be safe if query_nodes is not always initialized */
if (has_query_nodes && query_nodes) {
for (bs = bdrv_next_node(NULL); bs; bs = bdrv_next_node(bs)) {