btrfs snapshot gc

examples/tunasync.ini

@@ -13,7 +13,7 @@ max_retry = 2
 [btrfs]
 service_dir = {mirror_root}/{mirror_name}/_current
 working_dir = {mirror_root}/{mirror_name}/_working
-tmp_dir = {mirror_root}/{mirror_name}/_tmp
+gc_dir = {mirror_root}/{mirror_name}/_gc_{timestamp}
 
 
 # rmirror:archlinux]