[Qemu-devel] [PATCH RFC 2/7] block-backend: Introduce blk_root() helper

[zhanghailiang <zhang.zhanghailiang@huawei.com>]

With this helper function, we can get the BdrvChild struct
from BlockBackend

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
---
 block/block-backend.c          | 5 +++++
 include/sysemu/block-backend.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/block/block-backend.c b/block/block-backend.c
index 1a724a8..66387f0 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -389,6 +389,11 @@ BlockDriverState *blk_bs(BlockBackend *blk)
     return blk->root ? blk->root->bs : NULL;
 }
 
+BdrvChild *blk_root(BlockBackend *blk)
+{
+    return blk->root;
+}
+
 static BlockBackend *bdrv_first_blk(BlockDriverState *bs)
 {
     BdrvChild *child;
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index b07159b..867f9f5 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -99,6 +99,7 @@ void blk_remove_bs(BlockBackend *blk);
 void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs);
 bool bdrv_has_blk(BlockDriverState *bs);
 bool bdrv_is_root_node(BlockDriverState *bs);
+BdrvChild *blk_root(BlockBackend *blk);
 
 void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow);
 void blk_iostatus_enable(BlockBackend *blk);
-- 
1.8.3.1