bdrv_append must also copy open_flags to the top, because the snapshot
has BDRV_O_NO_BACKING set. This causes interesting results if you
later use drive-reopen (not upstream) to reopen the image, and lose
the backing file in the process.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
A last minute addition...
block.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/block.c b/block.c
index 1f4f476..9c7d896 100644
--- a/block.c
+++ b/block.c
@@ -934,6 +934,7 @@ void bdrv_append(BlockDriverState *bs_new, BlockDriverState
*bs_top)
tmp = *bs_new;
/* there are some fields that need to stay on the top layer: */
+ tmp.open_flags = bs_top->open_flags;
/* dev info */
tmp.dev_ops = bs_top->dev_ops;
--
1.7.9.3
