[LU-724] CLIO does not set lock handle in BRW

• Type: Bug
• Resolution: Won't Fix
• Priority: Minor
• Affects Version/s: Lustre 2.1.0
• Severity: 3
• Assignee: Jinshan Xiong (Inactive)
• Reporter: Johann Lombardi (Inactive)

Description

Unlike b1_8, CLIO does not set a valid lock handle in bulk write requests. osc_build_req() still uses oap->oap_ldlm_lock to fill the lock handle, but oap_ldlm_lock is always NULL, so we end up with oa->o_handle = NULL in requests.

We have been discussing for a while that all - when relevant of course - requests should specify a lock handle, so this is really a regression from this regard.
This lock handle is also used on the OST side to determine whether or not a BRW should make processed as a HP request. Not providing a lock handle put more load on the OST (e.g. in ost_rw_hpreq_check->ost_rw_prolong_locks()) since we always have to iterate over the list of dlm locks.