After device resize in DOM-0, DOM-U disklabel unchanged

[Louis Guillaume <louis%zabrico.com@localhost>]

Hi!

I have a DOM0 NetBSD system (netbsd-6 branch from Jan 2014).

LVM is used to manage the disk resources for the DOM-Us.

I have resized an LV in DOM-0 and everything looks good there.

But in the DOM-U, while the device looks to be the right size, disklabel 
doesn't see the correct number of sectors; it thinks everything was as 
it was before...


DOM-0

# lvdisplay vg1/lv2
  --- Logical volume ---
  LV Name                /dev/vg1/lv2
  VG Name                vg1
  LV UUID                kfgY4S-cc9S-YMVF-euUV-DTTh-9Wwu-OedDgD
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                32.00 GiB
  Current LE             8192
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     0
  Block device           169:4


DOM-U

# dmesg | grep xbd0
xbd0 at xenbus0 id 1: Xen Virtual Block Device Interface
xbd0: using event channel 6
xbd0: 32768 MB, 512 bytes/sect x 67108864 sectors
boot device: xbd0
root on xbd0a dumps on xbd0b

# disklabel xbd0 | egrep "(total sectors| d:)"
total sectors: 33554432
 d:  33554432  0     unused      0     0  # (Cyl.      0 -  16383)



How do I get disklabel to know about the new device info?

Louis