[LU-3242] class_handle_hash() may return zero cookies

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.4.0
• Severity: 3
• Assignee: John Hammond
• Reporter: John Hammond

Description

In class_handle_hash() if a cookie of zero is really so dangerous then perhaps it shouldn't be used.

        h->h_cookie = handle_base;
        if (unlikely(handle_base == 0)) {
                /* 
                 * Cookie of zero is "dangerous", because in many places it's
                 * assumed that 0 means "unassigned" handle, not bound to any
                 * object.
                 */
                CWARN("The universe has been exhausted: cookie wrap-around.\n");
                handle_base += HANDLE_INCR;
        }