[LU-11198] “lctl get_param“ doesn't return errno when reading fails

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.12.0
• Environment: both 2.10 and master branch have the problem
• Severity: 3
• Assignee: Wang Shilong (Inactive)
• Reporter: Li Xi

Description

The problem (Or feature? I don't think it is a good feature though) is caused by a defect in param_display(). The return failure of read_param() is ignored.

 

1. lctl get_param -n ost.OSS.ost_io.nrs_tbf_rule
   error: get_param: reading 'ost.OSS.ost_io.nrs_tbf_rule': No such device
   ]# echo $?
   0