VOP_RENAME(9) arguments question

From: Yar Tikhiy (yar_at_freebsd.org)
Date: 06/23/03

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    Date: Mon, 23 Jun 2003 18:14:56 +0400
To: arch@freebsd.org

    Hi there,

    I've seen code in the VOP_RENAME() vop implementations handling
    various cases of some of fvp, fdvp, tvp, and tdvp being different,
    or the same, or NULL. Some of such cases seem clear to me:

    tvp == NULL -- the destination file doesn't exist yet
    tdvp == fdvp -- renaming within the same directory
    tvp == fvp -- source and destination are hardlinks to the same file

    But what does mean the case of "tvp == tdvp"? I guess this can be
    true only if renaming to the root directory, which will fail, yet
    is a special case for unlocking tvp and tdvp.

    Can there be other special cases of arguments to VOP_RENAME(9)
    a developer should be aware of? 

    -- 
Yar
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