Talk about <read-cache.c> and <cache-tree.c>, things like:
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cache → the_index macros
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read_index()
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write_index()
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ie_match_stat() and ie_modified(); how they are different and when to use which.
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index_name_pos()
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remove_index_entry_at()
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remove_file_from_index()
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add_file_to_index()
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add_index_entry()
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refresh_index()
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discard_index()
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cache_tree_invalidate_path()
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cache_tree_update()
(JC, Linus)