properly name raid volumes on mpii

[David Gwynne]

you want to look up disks attached to an mpi by bus addressing, not
which raid volume you happen to be up to.

before this diff i got:

dlg@hotspare dlg$ sudo bioctl mpii0
Volume  Status               Size Device  
mpii0 0 Online       146163105280         RAID1
      0 Online       146815733248 0:2.0   noencl <SEAGATE ST9146852SS>
      1 Online       146815733248 0:3.0   noencl <SEAGATE ST9146852SS>
mpii0 1 Rebuild      148444806656 sd0     RAID1 78% done
      0 Online       149039750656 0:0.0   noencl <Pliant LB150S>
      1 Rebuild      149039750656 0:1.0   noencl <Pliant LB150S>

after:

dlg@hotspare pci$ sudo bioctl mpii0
Volume  Status               Size Device  
mpii0 0 Online       146163105280 sd0     RAID1
      0 Online       146815733248 0:2.0   noencl <SEAGATE ST9146852SS>
      1 Online       146815733248 0:3.0   noencl <SEAGATE ST9146852SS>
mpii0 1 Rebuild      148444806656 sd1     RAID1 84% done
      0 Online       149039750656 0:0.0   noencl <Pliant LB150S>
      1 Rebuild      149039750656 0:1.0   noencl <Pliant LB150S>

this also lets me address volumes by name (eg, bioctl sd1) now.

ok?

Index: mpii.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/mpii.c,v
retrieving revision 1.38
diff -u -p -r1.38 mpii.c
--- mpii.c      21 Feb 2011 09:36:15 -0000      1.38
+++ mpii.c      24 Feb 2011 01:40:08 -0000
@@ -4958,7 +4988,7 @@ mpii_ioctl_vol(struct mpii_softc *sc, st
 
        bv->bv_size = letoh64(vpg->max_lba) * letoh16(vpg->block_size);
 
-       lnk = scsi_get_link(sc->sc_scsibus, bv->bv_volid, 0);
+       lnk = scsi_get_link(sc->sc_scsibus, dev->slot, 0);
        if (lnk != NULL) {
                scdev = lnk->device_softc;
                strlcpy(bv->bv_dev, scdev->dv_xname, sizeof(bv->bv_dev));