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-rw-r--r--block/qcow2.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/qcow2.h b/block/qcow2.h
index 103abdb2c0..e4b5e11a91 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -58,6 +58,9 @@
#define DEFAULT_CLUSTER_SIZE 65536
+
+#define QCOW2_OPT_LAZY_REFCOUNTS "lazy_refcounts"
+
typedef struct QCowHeader {
uint32_t magic;
uint32_t version;