block: Add infrastructure for option inheritance

Options are not actually inherited from the parent node yet, but this
commit lays the grounds for doing so.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/block/block_int.h b/include/block/block_int.h
index 98336f60dd..abb6224439 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -343,7 +343,8 @@ typedef struct BdrvAioNotifier {
 } BdrvAioNotifier;
 
 struct BdrvChildRole {
-    int (*inherit_flags)(int parent_flags);
+    void (*inherit_options)(int *child_flags, QDict *child_options,
+                            int parent_flags, QDict *parent_options);
 };
 
 extern const BdrvChildRole child_file;