[Bug 251363] use unionfs as a disk-cache for NFS [feature]

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251363

--- Comment #15 from Gunther Schadow <raj at gusw.net> ---
See the related bug 251433 for the completion of this work as the
unionfs_copyfile now works with root cred and the copymode=transparent will
properly reflect the owner uid and gid.

There is one problem mentioned on that ticket that in theory provides write
permissions as root the first time the copyfile from lower to upper layer is
performed. But that is worked around / guarded by checking with VOP_ACCESS to
make sure that the calling user has all requested permissions before we do the
copyfile.

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