> If a mapping to be removed was private, any modifications made in this address range shall be discarded. Changes to private mappings aren't supposed to be re

> If a mapping to be removed was private, any modifications made in this address range shall be discarded. Changes to private mappings aren't supposed to be reflected in the underlying file, so this statement is a bit of a truism. Changes to shared mappings, on the other hand, are supposed to be reflected in the file, and that's what this article is about.