On Tue, Sep 09, 2008 at 02:56:45PM -0500, Danhua Shao wrote:
> 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() ?
You've stumbled onto something of a hack that we used to make interacting with
the provider a bit nicer. The nfsv3oparg_t is a synthetic type that you can
see at work in sdt_subr.c in the kernel. For both the 3 and 4 arguments
versions of the macros, the first three arguments are the same (struct
svc_req *, cred_t *, vnode_t *).
Adam
--
Adam Leventhal, Fishworks http://blogs.sun.com/ahl
