Unified getcwd() implementation

From: Bruce M Simpson (bms_at_spc.org)
Date: 08/14/03

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    Date: Thu, 14 Aug 2003 20:49:29 +0100
To: freebsd-arch@freebsd.org

    Hello all,

    I've had the attached patch in my tree for a 1 month period without
    any panics or other adverse effects that I could see.
    This is from one of phk's JKH todo list items.

    It merges the Linux in-kernel scanning-based getcwd() with our namei
    cache based implementation, in a way which tries to use the cache
    efficiently, but will use directory scanning upon a cache miss.
    This also has the advantage that scandir() games are no longer needed in libc.
                                                                                  
    Please let me know your thoughts on this. This is my first real bit of vfs
    related work, so I have no immediate plans to commit it until I can get
    concrete review going forward.

    Kind regards
    BMS

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