+ /* locks' mode are compatible, bits don't matter */
+ if (lockmode_compat(lock->l_req_mode, req->l_req_mode)) {
+ /* jump to last lock in mode group */
+ tmp = mode_tail;
+ continue;
+ }
+
+ for (;;) {
+ struct list_head *head;
+
+ /* Advance loop cursor to last lock in policy group. */
+ tmp = &list_entry(lock->l_sl_policy.prev,
+ struct ldlm_lock,
+ l_sl_policy)->l_res_link;
+
+ /* Locks with overlapping bits conflict. */
+ if (lock->l_policy_data.l_inodebits.bits & req_bits) {
+ /* COS lock mode has a special compatibility
+ * requirement: it is only compatible with
+ * locks from the same client. */
+ if (lock->l_req_mode == LCK_COS &&
+ !ldlm_is_cos_incompat(req) &&
+ ldlm_is_cos_enabled(req) &&
+ lock->l_client_cookie == req->l_client_cookie)
+ goto not_conflicting;
+ /* Found a conflicting policy group. */
+ if (!work_list)
+ RETURN(0);
+
+ compat = 0;
+
+ /* Add locks of the policy group to @work_list
+ * as blocking locks for @req */
+ if (lock->l_blocking_ast)
+ ldlm_add_ast_work_item(lock, req,
+ work_list);
+ head = &lock->l_sl_policy;
+ list_for_each_entry(lock, head, l_sl_policy)
+ if (lock->l_blocking_ast)
+ ldlm_add_ast_work_item(lock, req,
+ work_list);
+ }
+ not_conflicting:
+ if (tmp == mode_tail)
+ break;
+
+ tmp = tmp->next;
+ lock = list_entry(tmp, struct ldlm_lock,
+ l_res_link);
+ } /* Loop over policy groups within one mode group. */
+ } /* Loop over mode groups within @queue. */
+
+ RETURN(compat);