On 25.06.2020 18:21, Max Reitz wrote:
Use child access functions when iterating through backing chains so
filters do not break the chain.
In addition, bdrv_find_overlay() will now always return the actual
overlay; that is, it will never return a filter node but only one with a
COW backing file (there may be filter nodes between that node and @bs).
Signed-off-by: Max Reitz <[email protected]>
---
block.c | 41 +++++++++++++++++++++++++++++------------
1 file changed, 29 insertions(+), 12 deletions(-)
diff --git a/block.c b/block.c
index a44af9c3c1..712230ef5c 100644
--- a/block.c
+++ b/block.c
@@ -4724,7 +4724,8 @@ int bdrv_change_backing_file(BlockDriverState *bs,
}
/*
- * Finds the image layer in the chain that has 'bs' as its backing file.
+ * Finds the image layer in the chain that has 'bs' (or a filter on
+ * top of it) as its backing file.
One can optionally say "Finds the first non-filter parent of bs in the
chain".
...
Reviewed-by: Andrey Shinkevich <[email protected]>
