[LU-10449] TBF policy can't be set correctly

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.11.0, Lustre 2.10.4
• Severity: 3
• Assignee: Qian Yingjin (Inactive)
• Reporter: Emoly Liu

Description

The issue can be reproduced easily by the following steps:

$ lctl set_param ost.OSS.ost_io.nrs_policies="tbf nid"
$ lctl set_param ost.OSS.ost_io.nrs_policies="tbf"
lctl get_param ost.OSS.ost_io.nrs_policies
ost.OSS.ost_io.nrs_policies=

regular_requests:
 ...
  - name: tbf nid
    state: started
    fallback: no
    queued: 0                   
    active: 0                   
 ...
high_priority_requests:
...
  - name: tbf nid
    state: started
    fallback: no
    queued: 0                   
    active: 0                   
...

Generic "tbf" police can't be set correctly after setting "tbf <rule>".