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The 'stat' method is called for all paths, not just the specific file system node of the ROM module. The ROM update is needed only in the latter case. Otherwise, when always updating the ROM on stat, stat calls on the VFS become very expensive in the presence of a mounted ROM module if the ROM is obtained from fs_rom (which re-watches the file and all its individual path elements whenever the 'update' RPC function is called).
This source-code repository contains genuine low-level OS components and interfaces of Genode. It solely depends on the framework's base API.