Comment on the implementation

Author: kjetilk

lib/utils.js

@@ -293,6 +293,11 @@ async function overQuota (root, serverUri) {
   if (quota === Infinity) {
     return false
   }
+  // IMPORTANT NOTE: The following will traverse the directory to find
+  // the actual file size of the files in the file system. This is a
+  // costly operation, but neglible for the small quotas we currently
+  // allow. If the quotas grow bigger, this will significantly reduce
+  // write performance, and so it needs to be rewritten.
   var actualSize = await _asyncGetSize(root)
   return (actualSize > quota)
 }