New rename(2) function

[Igor Peshansky]

On Tue, 7 Aug 2007, Eric Blake wrote:

> Also, the check for link count >= 2 might also be optimized to skip
> directories (whose link count is always > 1, but since directories can't
> be hard-linked, it is not worth looking up their id).

Does POSIX mandate that directories cannot be hard-linked?  I think NTFS
can create hard links to directories, and reparse points can be used as
hard links.
	Igor
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