[LU-13503] allow setting larger max_mod_rpcs_in_flight dynamically

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0, Lustre 2.12.6
• Assignee: Jian Yu
• Reporter: Andreas Dilger

Description

Currently, an error is reported if mdc.*.max_mod_rpcs_in_flight is set larger or equal to mdc.*.max_rpcs_in_flight. However, it makes more sense to allow the user to set max_mod_rpcs_in_flight directly, and just increase max_rpcs_in_flight appropriately, rather than returning an error and telling the user to do that instead.

Also, during mount config parameter processing, there may be a race between MDC setup and config log handling, so allow max_mod_rpcs_in_flight to be temporarily increased, and then it will be reduced later to the server value when the OCD information is handled.

Issue Links

• is related to: LU-14145 protect cli->cl_import with with_imp_locked()
• is related to: LU-16454 can't set max_mod_rpcs_in_flight > 8
• is related to: LU-14144 get and set Lustre module parameters via "lctl get_param/set_param"