nfsrpc_open
int nfsrpc_open(vnode_t, int, struct ucred *, NFSPROC_T *);
openerr = nfsrpc_open(vp, FWRITE, cred,
openerr = nfsrpc_open(vp, FREAD, cred,
openerr = nfsrpc_open(vp, FWRITE, cred, p);
error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);