stream: Deal with filters

Because of the (not so recent anymore) changes that make the stream job
independent of the base node and instead track the node above it, we
have to split that "bottom" node into two cases: The bottom COW node,
and the node directly above the base node (which may be an R/W filter
or the bottom COW node).

Signed-off-by: Max Reitz <mreitz@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/blockdev.c b/blockdev.c
index 3848a9c..862aa1b 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2528,7 +2528,9 @@ void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
     }
 
     /* Check for op blockers in the whole chain between bs and base */
-    for (iter = bs; iter && iter != base_bs; iter = backing_bs(iter)) {
+    for (iter = bs; iter && iter != base_bs;
+         iter = bdrv_filter_or_cow_bs(iter))
+    {
         if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
             goto out;
         }