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-rw-r--r--block_int.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/block_int.h b/block_int.h
index 8898d91f42..0902fd4733 100644
--- a/block_int.h
+++ b/block_int.h
@@ -37,6 +37,7 @@
#define BLOCK_OPT_BACKING_FILE "backing_file"
#define BLOCK_OPT_BACKING_FMT "backing_fmt"
#define BLOCK_OPT_CLUSTER_SIZE "cluster_size"
+#define BLOCK_OPT_PREALLOC "preallocation"
typedef struct AIOPool {
void (*cancel)(BlockDriverAIOCB *acb);