[LU-6318] write back for group lock

• Type: Bug
• Resolution: Not a Bug
• Priority: Critical
• Fix Version/s: Lustre 2.8.0
• Affects Version/s: Lustre 2.7.0, Lustre 2.5.3
• Severity: 3
• Assignee: Jinshan Xiong (Inactive)
• Reporter: Jinshan Xiong (Inactive)

Description

In osc_lock_flush(), it writes back as follows:

        if (mode == CLM_WRITE) {
                rc = osc_cache_writeback_range(env, obj, start, end, 1,
                                               discard);

Write back should be applied to group lock as well.