[#LU-8027] Ensure OSC OBD has been set up in onu

The OBD may not setup successful while onu_upcall be invoked. So we have to check it in cl_ocd_update(). Since customer doing writeconf after this issue. So we have not possible to figure out why OBD was not setup. Below is original report from customer:

Hello ,
    MDT (ldiskfs, LSI 9286 syncro)
    OST (openzfs 0.6.4.1-1, JBOD) 
   We add some HDDs to JBOD enclosure.
   1. Update /etc/zfs/vdev_id.conf
   2. Create zpool 
   3. Enable compression
   4. mkfs.lustre (ost-24,ost-25)
   5. export zpool
   6. Add zfs and lustre mount resource to pacemaker

   All operates are successful
   A few minutes later, 

   7. MDT node reboot, I don 't know why.
   8. Login MDT passive node , pcs show MDT mount fail
   9. All lustre clients kernel panic(oh ,shit)
  10. e2fsck mdt
  11. writeconf mdt and osts
  12. mount mgt mdt and osts
  14. lustre client mount failed
  15. remount mdt and osts, mdt mount failed
  16. writeconf 
  17. mount ost-0, lustre client mount successful
  18. umount ost-0
  19. mount ost-24, lustre client mount failed
  20. mdt could not remount
  21. writeconf
  22. exclude ost-24 and ost-25 , mount mdt and the other osts
  23. mount mdt and osts
  24. lustre client mount successful

[LU-8027] Ensure OSC OBD has been set up in onu_upcall() Created: 14/Apr/16 Updated: 01/Oct/16 Resolved: 12/May/16
Status:	Resolved
Project:	Lustre
Component/s:	None
Affects Version/s:	None
Fix Version/s:	Lustre 2.9.0

[LU-8027] Ensure OSC OBD has been set up in onu_upcall() Created: 14/Apr/16 Updated: 01/Oct/16 Resolved: 12/May/16