2 files changed, 5 insertions, 1 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index df2b9c22b4cf..02b1cefbc308 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -482,9 +482,10 @@ struct btrfs_super_block {
         char label[BTRFS_LABEL_SIZE];
 
         __le64 cache_generation;
+        __le64 uuid_tree_generation;
 
         /* future expansion */
-        __le64 reserved[31];
+        __le64 reserved[30];
         u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
         struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
 } __attribute__ ((__packed__));
@@ -2900,6 +2901,8 @@ BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
                          cache_generation, 64);
 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
+BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
+                         uuid_tree_generation, 64);
 
 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
 {
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 72ab0dd31937..e76237c8802a 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1380,6 +1380,7 @@ static void update_super_roots(struct btrfs_root *root)
         super->root_level = root_item->level;
         if (btrfs_test_opt(root, SPACE_CACHE))
                 super->cache_generation = root_item->generation;
+        super->uuid_tree_generation = root_item->generation;
 }
 
 int btrfs_transaction_in_commit(struct btrfs_fs_info *info)