+ldlm_inodebits_compat_queue(struct list_head *queue, struct ldlm_lock *req,
+ struct list_head *work_list)
+{
+ struct list_head *tmp;
+ struct ldlm_lock *lock;
+ __u64 req_bits = req->l_policy_data.l_inodebits.bits;
+ __u64 *try_bits = &req->l_policy_data.l_inodebits.try_bits;
+ int compat = 1;
+
+ ENTRY;
+
+ /* There is no sense in lock with no bits set. Also such a lock
+ * would be compatible with any other bit lock.
+ * Meanwhile that can be true if there were just try_bits and all
+ * are failed, so just exit gracefully and let the caller to care.
+ */
+ if ((req_bits | *try_bits) == 0)
+ RETURN(0);
+
+ list_for_each(tmp, queue) {
+ struct list_head *mode_tail;
+
+ lock = list_entry(tmp, struct ldlm_lock, l_res_link);
+
+ /* We stop walking the queue if we hit ourselves so we don't
+ * take conflicting locks enqueued after us into account,
+ * or we'd wait forever. */
+ if (req == lock)
+ RETURN(compat);
+
+ /* last lock in mode group */
+ LASSERT(lock->l_sl_mode.prev != NULL);
+ mode_tail = &list_entry(lock->l_sl_mode.prev, struct ldlm_lock,
+ l_sl_mode)->l_res_link;
+
+ /* if request lock is not COS_INCOMPAT and COS is disabled,
+ * they are compatible, IOW this request is from a local
+ * transaction on a DNE system. */
+ if (lock->l_req_mode == LCK_COS && !ldlm_is_cos_incompat(req) &&
+ !ldlm_is_cos_enabled(req)) {
+ /* jump to last lock in mode group */
+ tmp = mode_tail;
+ continue;
+ }
+
+ /* 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;
+
+ /* drop try_bits used by other locks */
+ *try_bits &= ~(lock->l_policy_data.l_inodebits.bits);
+ if ((req_bits | *try_bits) == 0)
+ RETURN(0);
+
+ /* 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);
+}
+
+/**
+ * Process a granting attempt for IBITS lock.
+ * Must be called with ns lock held
+ *
+ * This function looks for any conflicts for \a lock in the granted or
+ * waiting queues. The lock is granted if no conflicts are found in
+ * either queue.
+ */
+int ldlm_process_inodebits_lock(struct ldlm_lock *lock, __u64 *flags,
+ enum ldlm_process_intention intention,
+ enum ldlm_error *err,
+ struct list_head *work_list)