diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index d119d95..f00c4be 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -247,6 +247,7 @@
  * room to translate 14 chunks with 3 stripes each.
  */
 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
+#define BTRFS_LABEL_SIZE 256
 
 /*
  * the super block basically lists the main trees of the FS
@@ -276,6 +277,7 @@
 	u8 root_level;
 	u8 chunk_root_level;
 	struct btrfs_dev_item dev_item;
+	char label[BTRFS_LABEL_SIZE];
 	u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
 } __attribute__ ((__packed__));