[LU-14054] add option to ofd_access_log_reader to exit on close of last log

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0
• Labels: hotpools
• Assignee: John Hammond
• Reporter: John Hammond

Description

When all OSTs are unmounted, ofd_access_log_reader will reach the end of each log and close it. Then it will wait on the control device for log creation. Implement an option to exit when all logs have gone away and discovery doesn't find any new logs. This will allow for more graceful OFD module unloading.