[nfs-discuss] is "nfsv3oparg" in nfs.d an undefined type?

[Danhua Shao]

Hi,

In lib/libdtrace/common/nfs.d, the following piece of code defines a 
type translation in sdt.

typedef struct nfsv3oparg nfsv3oparg_t;

#pragma D binding "1.5" translator
translator nfsv3opinfo_t < nfsv3oparg_t *P > {
        noi_xid = ((struct svc_req *)arg0)->rq_xprt->xp_xid;
        noi_cred = (cred_t *)arg1;
        noi_curpath = (arg2 == 0 || ((vnode_t *)arg2)->v_path == NULL) ?
            "<unknown>" : ((vnode_t *)arg2)->v_path;
};

However, I can not find the definition of "struct nfsv3oparg" in usr/src.

1) Does this type is just a dummy type that has not been really defined?

2) Inside the translator, arg0, arg1, arg2 are refer to the first 3 
arguments defined in macro DTRACE_NFSV3_3() or DTRACE_NFSV3_4() ?

Regards,

Danhua