[LogFS] Check feature flags
diff --git a/fs/logfs/logfs_abi.h b/fs/logfs/logfs_abi.h
index 5d3782dd..8d4dd3d 100644
--- a/fs/logfs/logfs_abi.h
+++ b/fs/logfs/logfs_abi.h
@@ -193,6 +193,10 @@
 
 SIZE_CHECK(logfs_segment_header, LOGFS_SEGMENT_HEADERSIZE);
 
+#define LOGFS_FEATURES_INCOMPAT		(0ull)
+#define LOGFS_FEATURES_RO_COMPAT	(0ull)
+#define LOGFS_FEATURES_COMPAT		(0ull)
+
 /**
  * struct logfs_disk_super - on-medium superblock
  *