Build provider 3rd arg from smb_request_t
hacking...
NEX-1643 dtrace provider for smbsrv
Also illumos 1841:
 DTrace smb provider was mis-implemented, doesn't exist.
Add back handlers for read/write raw, so that
 legacy dtrace consumers can find the probes.
Kill extra arg in smb_negotiate
Fix missing "done" probe with smb_notify
Add example consumer: smb-trace.d
fix soi_pid

@@ -113,23 +113,22 @@
                 *op->sd = sd;
         } else {
                 op->sd = NULL;
         }
 
-        DTRACE_SMB_2(op__NtTransactCreate__start, smb_request_t *, sr,
-            struct open_param *, op);
+        DTRACE_SMB_1(op__NtTransactCreate__start, smb_request_t *, sr); /* arg.open */
 
         return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
 }
 
 void
 smb_post_nt_transact_create(smb_request_t *sr, smb_xa_t *xa)
 {
         smb_sd_t *sd = sr->arg.open.sd;
+        _NOTE(ARGUNUSED(xa))
 
-        DTRACE_SMB_2(op__NtTransactCreate__done, smb_request_t *, sr,
-            smb_xa_t *, xa);
+        DTRACE_SMB_1(op__NtTransactCreate__done, smb_request_t *, sr);
 
         if (sd) {
                 smb_sd_term(sd);
                 kmem_free(sd, sizeof (smb_sd_t));
         }