[Qemu-block] [PATCH 09/12] block: Introduce BdrvChild.opaque

[Kevin Wolf]

BlockBackends use it to get a back pointer from BdrvChild to
BlockBackend in any BdrvChildRole callbacks.

Signed-off-by: Kevin Wolf <address@hidden>
---
 block/block-backend.c     | 2 ++
 include/block/block_int.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/block/block-backend.c b/block/block-backend.c
index 2309672..d2bd268 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -132,6 +132,7 @@ BlockBackend *blk_new_with_bs(Error **errp)
 
     bs = bdrv_new_root();
     blk->root = bdrv_root_attach_child(bs, "root", &child_root);
+    blk->root->opaque = blk;
     bs->blk = blk;
     return blk;
 }
@@ -457,6 +458,7 @@ void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs)
     assert(!blk->root && !bs->blk);
     bdrv_ref(bs);
     blk->root = bdrv_root_attach_child(bs, "root", &child_root);
+    blk->root->opaque = blk;
     bs->blk = blk;
 
     notifier_list_notify(&blk->insert_bs_notifiers, blk);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 0cc38d5..1b3c310 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -364,6 +364,7 @@ struct BdrvChild {
     BlockDriverState *bs;
     char *name;
     const BdrvChildRole *role;
+    void *opaque;
     QLIST_ENTRY(BdrvChild) next;
     QLIST_ENTRY(BdrvChild) next_parent;
 };
-- 
1.8.3.1