Btrfs: Add efficient dirty accounting to the extent_map tree

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 13c562f7cb6f..2ffc0c76338c 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -40,6 +40,7 @@ struct extent_map_tree {
 	struct rb_root map;
 	struct rb_root state;
 	struct address_space *mapping;
+	u64 dirty_bytes;
 	rwlock_t lock;
 	struct extent_map_ops *ops;
 	spinlock_t lru_lock;