Added a note about munmap not calling flush.
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@ -242,6 +242,10 @@ type FileSystem interface {
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// case of close(2), a flush error is returned to the user. For dup2(2), it
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// is not.
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//
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// Note that one potentially significant case where this is *not* called is
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// munmap(2). (Cf. http://goo.gl/7n1r9X, fuse-devel mailing list thread from
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// Han-Wen Nienhuys on 2014-10-08.)
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//
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// Because of cases like dup2(2), calls to FlushFile are not necessarily one
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// to one with calls to OpenFile. They should not be used for reference
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// counting, and the handle must remain valid even after the method is called
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