VOP_PRINT - print debugging information
     #include <sys/param.h>
     #include <sys/vnode.h>
     int
     VOP_PRINT(struct vnode *vp);
     The arguments are:
     vp  The vnode to print.
     Zero is returned on success, otherwise an error is returned.
     vnode(9)
     This manual page was written by Doug Rabson.