Merge branch 'nd/invalidate-i-t-a-cache-tree' into maint

* nd/invalidate-i-t-a-cache-tree: cache-tree: invalidate i-t-a paths after generating trees cache-tree: fix writing cache-tree when CE_REMOVE is present cache-tree: replace "for" loops in update_one with "while" loops cache-tree: remove dead i-t-a code in verify_cache()