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-rw-r--r--include/block/block_int.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 3d6cf88592..38dec0275b 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -53,6 +53,7 @@
 #define BLOCK_OPT_ADAPTER_TYPE      "adapter_type"
 #define BLOCK_OPT_REDUNDANCY        "redundancy"
 #define BLOCK_OPT_NOCOW             "nocow"
+#define BLOCK_OPT_EXTENT_SIZE_HINT  "extent_size_hint"
 #define BLOCK_OPT_OBJECT_SIZE       "object_size"
 #define BLOCK_OPT_REFCOUNT_BITS     "refcount_bits"
 #define BLOCK_OPT_DATA_FILE         "data_file"