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

@@ -102,11 +102,11 @@
         fqi = &sr->arg.dirop.fqi;
 
         if ((rc = smbsr_decode_vwv(sr, "w", &fqi->fq_sattr)) == 0)
                 rc = smbsr_decode_data(sr, "%S", sr, &fqi->fq_path.pn_path);
 
-        DTRACE_SMB_2(op__Delete__start, smb_request_t *, sr, smb_fqi_t *, fqi);
+        DTRACE_SMB_1(op__Delete__start, smb_request_t *, sr); /* arg.dirop */
 
         return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
 }
 
 void