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

*** 147,158 ****
          int rc;
          smb_fqi_t *fqi = &sr->arg.dirop.fqi;
  
          rc = smbsr_decode_data(sr, "%S", sr, &fqi->fq_path.pn_path);
  
!         DTRACE_SMB_2(op__QueryInformation__start, smb_request_t *, sr,
!             smb_fqi_t *, fqi);
  
          return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
  }
  
  void
--- 147,157 ----
          int rc;
          smb_fqi_t *fqi = &sr->arg.dirop.fqi;
  
          rc = smbsr_decode_data(sr, "%S", sr, &fqi->fq_path.pn_path);
  
!         DTRACE_SMB_1(op__QueryInformation__start, smb_request_t *, sr); /* arg.dirop */
  
          return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
  }
  
  void