diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 3c9053a1..9318c75 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1814,6 +1814,12 @@
 	struct list_head ordered_extents;
 	struct list_head ordered_root;
 	u64 nr_ordered_extents;
+
+	/*
+	 * Number of currently running SEND ioctls to prevent
+	 * manipulation with the read-only status via SUBVOL_SETFLAGS
+	 */
+	int send_in_progress;
 };
 
 struct btrfs_ioctl_defrag_range_args {