diff --git a/include/linux/fiemap.h b/include/linux/fiemap.h
index 934e22d65801e508f03774f5cb86fd4ae7b35e68..d830747f5c0b077e7ac894a687258ec82979af69 100644
--- a/include/linux/fiemap.h
+++ b/include/linux/fiemap.h
@@ -62,5 +62,7 @@ struct fiemap {
 #define FIEMAP_EXTENT_MERGED		0x00001000 /* File does not natively
 						    * support extents. Result
 						    * merged for efficiency. */
+#define FIEMAP_EXTENT_SHARED		0x00002000 /* Space shared with other
+						    * files. */
 
 #endif /* _LINUX_FIEMAP_H */