1 files changed, 4 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 47dea7118e0e..1eafccb162ee 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -893,6 +893,10 @@ struct btrfs_fs_info {
         spinlock_t block_group_cache_lock;
         struct rb_root block_group_cache_tree;
 
+        /* keep track of unallocated space */
+        spinlock_t free_chunk_lock;
+        u64 free_chunk_space;
+
         struct extent_io_tree freed_extents[2];
         struct extent_io_tree *pinned_extents;