block: Add bdrv_next_node

Similar to bdrv_next, this traverses through graph_bdrv_states. Will be
useful to enumerate all the named nodes.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/block.c b/block.c
index a612594db5..e8a0342cce 100644
--- a/block.c
+++ b/block.c
@@ -3801,6 +3801,14 @@ bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base)
     return top != NULL;
 }
 
+BlockDriverState *bdrv_next_node(BlockDriverState *bs)
+{
+    if (!bs) {
+        return QTAILQ_FIRST(&graph_bdrv_states);
+    }
+    return QTAILQ_NEXT(bs, node_list);
+}
+
 BlockDriverState *bdrv_next(BlockDriverState *bs)
 {
     if (!bs) {