[LU-3882] mounting a Lustre FS when already running an HSM CT causes the new mount to register as a CT

• Type: Technical task
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.5.0
• Affects Version/s: Lustre 2.5.0
• Labels: HSM
• Assignee: John Hammond
• Reporter: John Hammond

Description

Due to the global KUC lists, seeing IMP_EVENT_ACTIVE on any MDC import will cause any already registered CT archive masks to be registered with the MDT behind that import.

mdc_import_event(..., ..., imp, IMP_EVENT_ACTIVE)
    mdc_kuc_reregister(imp)
        libcfs_kkuc_group_foreach(KUC_GRP_HSM, mdc_hsm_ct_reregister, imp)
                                         (void *)imp)
            cfs_list_for_each_entry(reg, ... KUC_GRP_HSM, ...)
                mdc_hsm_ct_reregister(reg->kr_reg = archives, imp)
                    mdc_ioc_hsm_ct_register(imp, archives)
                        /* Send MDS_HSM_CT_REGISTER. */