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Disable unused pathname::pn_path* (unneeded in Linux)
struct pathname is originally from Solaris VFS, and it has been used in ZoL to merely call VOP from Linux VFS interface without API change, therefore pathname::pn_path* are unused and unneeded. Technically, struct pathname is a wrapper for C string in ZoL. Saves stack a bit on lookup and unlink. (#if0'd members instead of removing since comments refer to them.) Signed-off-by: Tomohiro Kusumi <firstname.lastname@example.org>
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