1 files changed, 2 insertions, 0 deletions
diff --git a/ctree.h b/ctree.h
index 94893388..fa73c4a4 100644
--- a/ctree.h
+++ b/ctree.h
@@ -40,6 +40,8 @@ struct btrfs_trans_handle;
 struct btrfs_free_space_ctl;
 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
 
+#define BTRFS_MAX_MIRRORS 3
+
 #define BTRFS_MAX_LEVEL 8
 
 #define BTRFS_COMPAT_EXTENT_TREE_V0