-#define BTREE_ITER_IS_EXTENTS (1 << 4)
-#define BTREE_ITER_NOT_EXTENTS (1 << 5)
-#define BTREE_ITER_CACHED (1 << 6)
-#define BTREE_ITER_WITH_KEY_CACHE (1 << 7)
-#define BTREE_ITER_WITH_UPDATES (1 << 8)
-#define BTREE_ITER_WITH_JOURNAL (1 << 9)
-#define __BTREE_ITER_ALL_SNAPSHOTS (1 << 10)
-#define BTREE_ITER_ALL_SNAPSHOTS (1 << 11)
-#define BTREE_ITER_FILTER_SNAPSHOTS (1 << 12)
-#define BTREE_ITER_NOPRESERVE (1 << 13)
-#define BTREE_ITER_CACHED_NOFILL (1 << 14)
-#define BTREE_ITER_KEY_CACHE_FILL (1 << 15)
+static const u16 BTREE_ITER_IS_EXTENTS = 1 << 4;
+static const u16 BTREE_ITER_NOT_EXTENTS = 1 << 5;
+static const u16 BTREE_ITER_CACHED = 1 << 6;
+static const u16 BTREE_ITER_WITH_KEY_CACHE = 1 << 7;
+static const u16 BTREE_ITER_WITH_UPDATES = 1 << 8;
+static const u16 BTREE_ITER_WITH_JOURNAL = 1 << 9;
+static const u16 __BTREE_ITER_ALL_SNAPSHOTS = 1 << 10;
+static const u16 BTREE_ITER_ALL_SNAPSHOTS = 1 << 11;
+static const u16 BTREE_ITER_FILTER_SNAPSHOTS = 1 << 12;
+static const u16 BTREE_ITER_NOPRESERVE = 1 << 13;
+static const u16 BTREE_ITER_CACHED_NOFILL = 1 << 14;
+static const u16 BTREE_ITER_KEY_CACHE_FILL = 1 << 15;