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-rw-r--r--block/cow.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/block/cow.c b/block/cow.c
index a05a92c..8f81ee6 100644
--- a/block/cow.c
+++ b/block/cow.c
@@ -414,6 +414,7 @@ static BlockDriver bdrv_cow = {
.bdrv_close = cow_close,
.bdrv_create = cow_create,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
+ .supports_backing = true,
.bdrv_read = cow_co_read,
.bdrv_write = cow_co_write,
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