4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License version 2 for more details. A copy is
14 * included in the COPYING file that accompanied this code.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Copyright (c) 2011 Intel Corporation
25 * Copyright 2012 Xyratex Technology Limited
30 * Network Request Scheduler (NRS)
32 * Allows to reorder the handling of RPCs at servers.
34 * Author: Liang Zhen <liang@whamcloud.com>
35 * Author: Nikitas Angelinas <nikitas_angelinas@xyratex.com>
42 #define DEBUG_SUBSYSTEM S_RPC
43 #include <obd_support.h>
44 #include <obd_class.h>
45 #include <lustre_net.h>
46 #include <lprocfs_status.h>
47 #include <linux/libcfs/libcfs.h>
48 #include "ptlrpc_internal.h"
50 /* XXX: This is just for liblustre. Remove the #if defined directive when the
51 * "cfs_" prefix is dropped from cfs_list_head. */
52 extern struct list_head ptlrpc_all_services;
57 struct nrs_core nrs_core;
59 static int nrs_policy_init(struct ptlrpc_nrs_policy *policy)
61 return policy->pol_desc->pd_ops->op_policy_init != NULL ?
62 policy->pol_desc->pd_ops->op_policy_init(policy) : 0;
65 static void nrs_policy_fini(struct ptlrpc_nrs_policy *policy)
67 LASSERT(policy->pol_ref == 0);
68 LASSERT(policy->pol_req_queued == 0);
70 if (policy->pol_desc->pd_ops->op_policy_fini != NULL)
71 policy->pol_desc->pd_ops->op_policy_fini(policy);
74 static int nrs_policy_ctl_locked(struct ptlrpc_nrs_policy *policy,
75 enum ptlrpc_nrs_ctl opc, void *arg)
78 * The policy may be stopped, but the lprocfs files and
79 * ptlrpc_nrs_policy instances remain present until unregistration time.
80 * Do not perform the ctl operation if the policy is stopped, as
81 * policy->pol_private will be NULL in such a case.
83 if (policy->pol_state == NRS_POL_STATE_STOPPED)
86 return policy->pol_desc->pd_ops->op_policy_ctl != NULL ?
87 policy->pol_desc->pd_ops->op_policy_ctl(policy, opc, arg) :
91 static void nrs_policy_stop0(struct ptlrpc_nrs_policy *policy)
93 struct ptlrpc_nrs *nrs = policy->pol_nrs;
95 if (policy->pol_desc->pd_ops->op_policy_stop != NULL) {
96 spin_unlock(&nrs->nrs_lock);
98 policy->pol_desc->pd_ops->op_policy_stop(policy);
100 spin_lock(&nrs->nrs_lock);
103 LASSERT(list_empty(&policy->pol_list_queued));
104 LASSERT(policy->pol_req_queued == 0 &&
105 policy->pol_req_started == 0);
107 policy->pol_private = NULL;
109 policy->pol_state = NRS_POL_STATE_STOPPED;
111 if (atomic_dec_and_test(&policy->pol_desc->pd_refs))
112 module_put(policy->pol_desc->pd_owner);
115 static int nrs_policy_stop_locked(struct ptlrpc_nrs_policy *policy)
117 struct ptlrpc_nrs *nrs = policy->pol_nrs;
119 if (nrs->nrs_policy_fallback == policy && !nrs->nrs_stopping)
122 if (policy->pol_state == NRS_POL_STATE_STARTING)
125 /* In progress or already stopped */
126 if (policy->pol_state != NRS_POL_STATE_STARTED)
129 policy->pol_state = NRS_POL_STATE_STOPPING;
131 /* Immediately make it invisible */
132 if (nrs->nrs_policy_primary == policy) {
133 nrs->nrs_policy_primary = NULL;
136 LASSERT(nrs->nrs_policy_fallback == policy);
137 nrs->nrs_policy_fallback = NULL;
140 /* I have the only refcount */
141 if (policy->pol_ref == 1)
142 nrs_policy_stop0(policy);
148 * Transitions the \a nrs NRS head's primary policy to
149 * ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPING and if the policy has no
150 * pending usage references, to ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPED.
152 * \param[in] nrs the NRS head to carry out this operation on
154 static void nrs_policy_stop_primary(struct ptlrpc_nrs *nrs)
156 struct ptlrpc_nrs_policy *tmp = nrs->nrs_policy_primary;
162 nrs->nrs_policy_primary = NULL;
164 LASSERT(tmp->pol_state == NRS_POL_STATE_STARTED);
165 tmp->pol_state = NRS_POL_STATE_STOPPING;
167 if (tmp->pol_ref == 0)
168 nrs_policy_stop0(tmp);
172 * Transitions a policy across the ptlrpc_nrs_pol_state range of values, in
173 * response to an lprocfs command to start a policy.
175 * If a primary policy different to the current one is specified, this function
176 * will transition the new policy to the
177 * ptlrpc_nrs_pol_state::NRS_POL_STATE_STARTING and then to
178 * ptlrpc_nrs_pol_state::NRS_POL_STATE_STARTED, and will then transition
179 * the old primary policy (if there is one) to
180 * ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPING, and if there are no outstanding
181 * references on the policy to ptlrpc_nrs_pol_stae::NRS_POL_STATE_STOPPED.
183 * If the fallback policy is specified, this is taken to indicate an instruction
184 * to stop the current primary policy, without substituting it with another
185 * primary policy, so the primary policy (if any) is transitioned to
186 * ptlrpc_nrs_pol_state::NRS_POL_STATE_STOPPING, and if there are no outstanding
187 * references on the policy to ptlrpc_nrs_pol_stae::NRS_POL_STATE_STOPPED. In
188 * this case, the fallback policy is only left active in the NRS head.
190 static int nrs_policy_start_locked(struct ptlrpc_nrs_policy *policy)
192 struct ptlrpc_nrs *nrs = policy->pol_nrs;
196 * Don't allow multiple starting which is too complex, and has no real
199 if (nrs->nrs_policy_starting)
202 LASSERT(policy->pol_state != NRS_POL_STATE_STARTING);
204 if (policy->pol_state == NRS_POL_STATE_STOPPING)
207 if (policy->pol_flags & PTLRPC_NRS_FL_FALLBACK) {
209 * This is for cases in which the user sets the policy to the
210 * fallback policy (currently fifo for all services); i.e. the
211 * user is resetting the policy to the default; so we stop the
212 * primary policy, if any.
214 if (policy == nrs->nrs_policy_fallback) {
215 nrs_policy_stop_primary(nrs);
220 * If we reach here, we must be setting up the fallback policy
221 * at service startup time, and only a single policy with the
222 * nrs_policy_flags::PTLRPC_NRS_FL_FALLBACK flag set can
223 * register with NRS core.
225 LASSERT(nrs->nrs_policy_fallback == NULL);
228 * Shouldn't start primary policy if w/o fallback policy.
230 if (nrs->nrs_policy_fallback == NULL)
233 if (policy->pol_state == NRS_POL_STATE_STARTED)
238 * Increase the module usage count for policies registering from other
241 if (atomic_inc_return(&policy->pol_desc->pd_refs) == 1 &&
242 !try_module_get(policy->pol_desc->pd_owner)) {
243 atomic_dec(&policy->pol_desc->pd_refs);
244 CERROR("NRS: cannot get module for policy %s; is it alive?\n",
245 policy->pol_desc->pd_name);
250 * Serialize policy starting across the NRS head
252 nrs->nrs_policy_starting = 1;
254 policy->pol_state = NRS_POL_STATE_STARTING;
256 if (policy->pol_desc->pd_ops->op_policy_start) {
257 spin_unlock(&nrs->nrs_lock);
259 rc = policy->pol_desc->pd_ops->op_policy_start(policy);
261 spin_lock(&nrs->nrs_lock);
263 if (atomic_dec_and_test(&policy->pol_desc->pd_refs))
264 module_put(policy->pol_desc->pd_owner);
266 policy->pol_state = NRS_POL_STATE_STOPPED;
271 policy->pol_state = NRS_POL_STATE_STARTED;
273 if (policy->pol_flags & PTLRPC_NRS_FL_FALLBACK) {
275 * This path is only used at PTLRPC service setup time.
277 nrs->nrs_policy_fallback = policy;
280 * Try to stop the current primary policy if there is one.
282 nrs_policy_stop_primary(nrs);
285 * And set the newly-started policy as the primary one.
287 nrs->nrs_policy_primary = policy;
291 nrs->nrs_policy_starting = 0;
297 * Increases the policy's usage reference count.
299 static inline void nrs_policy_get_locked(struct ptlrpc_nrs_policy *policy)
305 * Decreases the policy's usage reference count, and stops the policy in case it
306 * was already stopping and have no more outstanding usage references (which
307 * indicates it has no more queued or started requests, and can be safely
310 static void nrs_policy_put_locked(struct ptlrpc_nrs_policy *policy)
312 LASSERT(policy->pol_ref > 0);
315 if (unlikely(policy->pol_ref == 0 &&
316 policy->pol_state == NRS_POL_STATE_STOPPING))
317 nrs_policy_stop0(policy);
320 static void nrs_policy_put(struct ptlrpc_nrs_policy *policy)
322 spin_lock(&policy->pol_nrs->nrs_lock);
323 nrs_policy_put_locked(policy);
324 spin_unlock(&policy->pol_nrs->nrs_lock);
328 * Find and return a policy by name.
330 static struct ptlrpc_nrs_policy * nrs_policy_find_locked(struct ptlrpc_nrs *nrs,
333 struct ptlrpc_nrs_policy *tmp;
335 list_for_each_entry(tmp, &nrs->nrs_policy_list, pol_list) {
336 if (strncmp(tmp->pol_desc->pd_name, name,
337 NRS_POL_NAME_MAX) == 0) {
338 nrs_policy_get_locked(tmp);
346 * Release references for the resource hierarchy moving upwards towards the
347 * policy instance resource.
349 static void nrs_resource_put(struct ptlrpc_nrs_resource *res)
351 struct ptlrpc_nrs_policy *policy = res->res_policy;
353 if (policy->pol_desc->pd_ops->op_res_put != NULL) {
354 struct ptlrpc_nrs_resource *parent;
356 for (; res != NULL; res = parent) {
357 parent = res->res_parent;
358 policy->pol_desc->pd_ops->op_res_put(policy, res);
364 * Obtains references for each resource in the resource hierarchy for request
365 * \a nrq if it is to be handled by \a policy.
367 * \param[in] policy the policy
368 * \param[in] nrq the request
369 * \param[in] moving_req denotes whether this is a call to the function by
370 * ldlm_lock_reorder_req(), in order to move \a nrq to
371 * the high-priority NRS head; we should not sleep when
374 * \retval NULL resource hierarchy references not obtained
375 * \retval valid-pointer the bottom level of the resource hierarchy
377 * \see ptlrpc_nrs_pol_ops::op_res_get()
380 struct ptlrpc_nrs_resource * nrs_resource_get(struct ptlrpc_nrs_policy *policy,
381 struct ptlrpc_nrs_request *nrq,
385 * Set to NULL to traverse the resource hierarchy from the top.
387 struct ptlrpc_nrs_resource *res = NULL;
388 struct ptlrpc_nrs_resource *tmp = NULL;
392 rc = policy->pol_desc->pd_ops->op_res_get(policy, nrq, res,
396 nrs_resource_put(res);
400 LASSERT(tmp != NULL);
401 tmp->res_parent = res;
402 tmp->res_policy = policy;
406 * Return once we have obtained a reference to the bottom level
407 * of the resource hierarchy.
415 * Obtains resources for the resource hierarchies and policy references for
416 * the fallback and current primary policy (if any), that will later be used
417 * to handle request \a nrq.
419 * \param[in] nrs the NRS head instance that will be handling request \a nrq.
420 * \param[in] nrq the request that is being handled.
421 * \param[out] resp the array where references to the resource hierarchy are
423 * \param[in] moving_req is set when obtaining resources while moving a
424 * request from a policy on the regular NRS head to a
425 * policy on the HP NRS head (via
426 * ldlm_lock_reorder_req()). It signifies that
427 * allocations to get resources should be atomic; for
428 * a full explanation, see comment in
429 * ptlrpc_nrs_pol_ops::op_res_get().
431 static void nrs_resource_get_safe(struct ptlrpc_nrs *nrs,
432 struct ptlrpc_nrs_request *nrq,
433 struct ptlrpc_nrs_resource **resp,
436 struct ptlrpc_nrs_policy *primary = NULL;
437 struct ptlrpc_nrs_policy *fallback = NULL;
439 memset(resp, 0, sizeof(resp[0]) * NRS_RES_MAX);
442 * Obtain policy references.
444 spin_lock(&nrs->nrs_lock);
446 fallback = nrs->nrs_policy_fallback;
447 nrs_policy_get_locked(fallback);
449 primary = nrs->nrs_policy_primary;
451 nrs_policy_get_locked(primary);
453 spin_unlock(&nrs->nrs_lock);
456 * Obtain resource hierarchy references.
458 resp[NRS_RES_FALLBACK] = nrs_resource_get(fallback, nrq, moving_req);
459 LASSERT(resp[NRS_RES_FALLBACK] != NULL);
461 if (primary != NULL) {
462 resp[NRS_RES_PRIMARY] = nrs_resource_get(primary, nrq,
465 * A primary policy may exist which may not wish to serve a
466 * particular request for different reasons; release the
467 * reference on the policy as it will not be used for this
470 if (resp[NRS_RES_PRIMARY] == NULL)
471 nrs_policy_put(primary);
476 * Releases references to resource hierarchies and policies, because they are no
477 * longer required; used when request handling has been completed, or the
478 * request is moving to the high priority NRS head.
480 * \param resp the resource hierarchy that is being released
482 * \see ptlrpcnrs_req_hp_move()
483 * \see ptlrpc_nrs_req_finalize()
485 static void nrs_resource_put_safe(struct ptlrpc_nrs_resource **resp)
487 struct ptlrpc_nrs_policy *pols[NRS_RES_MAX];
488 struct ptlrpc_nrs *nrs = NULL;
491 for (i = 0; i < NRS_RES_MAX; i++) {
492 if (resp[i] != NULL) {
493 pols[i] = resp[i]->res_policy;
494 nrs_resource_put(resp[i]);
501 for (i = 0; i < NRS_RES_MAX; i++) {
506 nrs = pols[i]->pol_nrs;
507 spin_lock(&nrs->nrs_lock);
509 nrs_policy_put_locked(pols[i]);
513 spin_unlock(&nrs->nrs_lock);
517 * Obtains an NRS request from \a policy for handling or examination; the
518 * request should be removed in the 'handling' case.
520 * Calling into this function implies we already know the policy has a request
521 * waiting to be handled.
523 * \param[in] policy the policy from which a request
524 * \param[in] peek when set, signifies that we just want to examine the
525 * request, and not handle it, so the request is not removed
527 * \param[in] force when set, it will force a policy to return a request if it
530 * \retval the NRS request to be handled
533 struct ptlrpc_nrs_request * nrs_request_get(struct ptlrpc_nrs_policy *policy,
534 bool peek, bool force)
536 struct ptlrpc_nrs_request *nrq;
538 LASSERT(policy->pol_req_queued > 0);
540 nrq = policy->pol_desc->pd_ops->op_req_get(policy, peek, force);
542 LASSERT(ergo(nrq != NULL, nrs_request_policy(nrq) == policy));
548 * Enqueues request \a nrq for later handling, via one one the policies for
549 * which resources where earlier obtained via nrs_resource_get_safe(). The
550 * function attempts to enqueue the request first on the primary policy
551 * (if any), since this is the preferred choice.
553 * \param nrq the request being enqueued
555 * \see nrs_resource_get_safe()
557 static inline void nrs_request_enqueue(struct ptlrpc_nrs_request *nrq)
559 struct ptlrpc_nrs_policy *policy;
564 * Try in descending order, because the primary policy (if any) is
565 * the preferred choice.
567 for (i = NRS_RES_MAX - 1; i >= 0; i--) {
568 if (nrq->nr_res_ptrs[i] == NULL)
572 policy = nrq->nr_res_ptrs[i]->res_policy;
574 rc = policy->pol_desc->pd_ops->op_req_enqueue(policy, nrq);
576 policy->pol_nrs->nrs_req_queued++;
577 policy->pol_req_queued++;
582 * Should never get here, as at least the primary policy's
583 * ptlrpc_nrs_pol_ops::op_req_enqueue() implementation should always
590 * Called when a request has been handled
592 * \param[in] nrs the request that has been handled; can be used for
593 * job/resource control.
595 * \see ptlrpc_nrs_req_stop_nolock()
597 static inline void nrs_request_stop(struct ptlrpc_nrs_request *nrq)
599 struct ptlrpc_nrs_policy *policy = nrs_request_policy(nrq);
601 if (policy->pol_desc->pd_ops->op_req_stop)
602 policy->pol_desc->pd_ops->op_req_stop(policy, nrq);
604 LASSERT(policy->pol_nrs->nrs_req_started > 0);
605 LASSERT(policy->pol_req_started > 0);
607 policy->pol_nrs->nrs_req_started--;
608 policy->pol_req_started--;
612 * Handler for operations that can be carried out on policies.
614 * Handles opcodes that are common to all policy types within NRS core, and
615 * passes any unknown opcodes to the policy-specific control function.
617 * \param[in] nrs the NRS head this policy belongs to.
618 * \param[in] name the human-readable policy name; should be the same as
619 * ptlrpc_nrs_pol_desc::pd_name.
620 * \param[in] opc the opcode of the operation being carried out.
621 * \param[in,out] arg can be used to pass information in and out between when
622 * carrying an operation; usually data that is private to
623 * the policy at some level, or generic policy status
626 * \retval -ve error condition
627 * \retval 0 operation was carried out successfully
629 static int nrs_policy_ctl(struct ptlrpc_nrs *nrs, char *name,
630 enum ptlrpc_nrs_ctl opc, void *arg)
632 struct ptlrpc_nrs_policy *policy;
635 spin_lock(&nrs->nrs_lock);
637 policy = nrs_policy_find_locked(nrs, name);
639 GOTO(out, rc = -ENOENT);
643 * Unknown opcode, pass it down to the policy-specific control
644 * function for handling.
647 rc = nrs_policy_ctl_locked(policy, opc, arg);
653 case PTLRPC_NRS_CTL_START:
654 rc = nrs_policy_start_locked(policy);
659 nrs_policy_put_locked(policy);
661 spin_unlock(&nrs->nrs_lock);
667 * Unregisters a policy by name.
669 * \param[in] nrs the NRS head this policy belongs to.
670 * \param[in] name the human-readable policy name; should be the same as
671 * ptlrpc_nrs_pol_desc::pd_name
676 static int nrs_policy_unregister(struct ptlrpc_nrs *nrs, char *name)
678 struct ptlrpc_nrs_policy *policy = NULL;
680 spin_lock(&nrs->nrs_lock);
682 policy = nrs_policy_find_locked(nrs, name);
683 if (policy == NULL) {
684 spin_unlock(&nrs->nrs_lock);
686 CERROR("Can't find NRS policy %s\n", name);
690 if (policy->pol_ref > 1) {
691 CERROR("Policy %s is busy with %d references\n", name,
692 (int)policy->pol_ref);
693 nrs_policy_put_locked(policy);
695 spin_unlock(&nrs->nrs_lock);
699 LASSERT(policy->pol_req_queued == 0);
700 LASSERT(policy->pol_req_started == 0);
702 if (policy->pol_state != NRS_POL_STATE_STOPPED) {
703 nrs_policy_stop_locked(policy);
704 LASSERT(policy->pol_state == NRS_POL_STATE_STOPPED);
707 list_del(&policy->pol_list);
710 nrs_policy_put_locked(policy);
712 spin_unlock(&nrs->nrs_lock);
714 nrs_policy_fini(policy);
716 LASSERT(policy->pol_private == NULL);
717 OBD_FREE_PTR(policy);
723 * Register a policy from \policy descriptor \a desc with NRS head \a nrs.
725 * \param[in] nrs the NRS head on which the policy will be registered.
726 * \param[in] desc the policy descriptor from which the information will be
727 * obtained to register the policy.
732 static int nrs_policy_register(struct ptlrpc_nrs *nrs,
733 struct ptlrpc_nrs_pol_desc *desc)
735 struct ptlrpc_nrs_policy *policy;
736 struct ptlrpc_nrs_policy *tmp;
737 struct ptlrpc_service_part *svcpt = nrs->nrs_svcpt;
740 LASSERT(svcpt != NULL);
741 LASSERT(desc->pd_ops != NULL);
742 LASSERT(desc->pd_ops->op_res_get != NULL);
743 LASSERT(desc->pd_ops->op_req_get != NULL);
744 LASSERT(desc->pd_ops->op_req_enqueue != NULL);
745 LASSERT(desc->pd_ops->op_req_dequeue != NULL);
746 LASSERT(desc->pd_compat != NULL);
748 OBD_CPT_ALLOC_GFP(policy, svcpt->scp_service->srv_cptable,
749 svcpt->scp_cpt, sizeof(*policy), __GFP_IO);
753 policy->pol_nrs = nrs;
754 policy->pol_desc = desc;
755 policy->pol_state = NRS_POL_STATE_STOPPED;
756 policy->pol_flags = desc->pd_flags;
758 INIT_LIST_HEAD(&policy->pol_list);
759 INIT_LIST_HEAD(&policy->pol_list_queued);
761 rc = nrs_policy_init(policy);
763 OBD_FREE_PTR(policy);
767 spin_lock(&nrs->nrs_lock);
769 tmp = nrs_policy_find_locked(nrs, policy->pol_desc->pd_name);
771 CERROR("NRS policy %s has been registered, can't register it "
772 "for %s\n", policy->pol_desc->pd_name,
773 svcpt->scp_service->srv_name);
774 nrs_policy_put_locked(tmp);
776 spin_unlock(&nrs->nrs_lock);
777 nrs_policy_fini(policy);
778 OBD_FREE_PTR(policy);
783 list_add_tail(&policy->pol_list, &nrs->nrs_policy_list);
786 if (policy->pol_flags & PTLRPC_NRS_FL_REG_START)
787 rc = nrs_policy_start_locked(policy);
789 spin_unlock(&nrs->nrs_lock);
792 (void) nrs_policy_unregister(nrs, policy->pol_desc->pd_name);
798 * Enqueue request \a req using one of the policies its resources are referring
801 * \param[in] req the request to enqueue.
803 static void ptlrpc_nrs_req_add_nolock(struct ptlrpc_request *req)
805 struct ptlrpc_nrs_policy *policy;
807 LASSERT(req->rq_nrq.nr_initialized);
808 LASSERT(!req->rq_nrq.nr_enqueued);
810 nrs_request_enqueue(&req->rq_nrq);
811 req->rq_nrq.nr_enqueued = 1;
813 policy = nrs_request_policy(&req->rq_nrq);
815 * Add the policy to the NRS head's list of policies with enqueued
816 * requests, if it has not been added there.
818 if (unlikely(list_empty(&policy->pol_list_queued)))
819 list_add_tail(&policy->pol_list_queued,
820 &policy->pol_nrs->nrs_policy_queued);
824 * Enqueue a request on the high priority NRS head.
826 * \param req the request to enqueue.
828 static void ptlrpc_nrs_hpreq_add_nolock(struct ptlrpc_request *req)
830 int opc = lustre_msg_get_opc(req->rq_reqmsg);
832 spin_lock(&req->rq_lock);
834 ptlrpc_nrs_req_add_nolock(req);
836 DEBUG_REQ(D_NET, req, "high priority req");
837 spin_unlock(&req->rq_lock);
841 * Returns a boolean predicate indicating whether the policy described by
842 * \a desc is adequate for use with service \a svc.
844 * \param[in] svc the service
845 * \param[in] desc the policy descriptor
847 * \retval false the policy is not compatible with the service
848 * \retval true the policy is compatible with the service
850 static inline bool nrs_policy_compatible(const struct ptlrpc_service *svc,
851 const struct ptlrpc_nrs_pol_desc *desc)
853 return desc->pd_compat(svc, desc);
857 * Registers all compatible policies in nrs_core.nrs_policies, for NRS head
860 * \param[in] nrs the NRS head
865 * \pre mutex_is_locked(&nrs_core.nrs_mutex)
867 * \see ptlrpc_service_nrs_setup()
869 static int nrs_register_policies_locked(struct ptlrpc_nrs *nrs)
871 struct ptlrpc_nrs_pol_desc *desc;
872 /* for convenience */
873 struct ptlrpc_service_part *svcpt = nrs->nrs_svcpt;
874 struct ptlrpc_service *svc = svcpt->scp_service;
877 LASSERT(mutex_is_locked(&nrs_core.nrs_mutex));
879 list_for_each_entry(desc, &nrs_core.nrs_policies, pd_list) {
880 if (nrs_policy_compatible(svc, desc)) {
881 rc = nrs_policy_register(nrs, desc);
883 CERROR("Failed to register NRS policy %s for "
884 "partition %d of service %s: %d\n",
885 desc->pd_name, svcpt->scp_cpt,
888 * Fail registration if any of the policies'
889 * registration fails.
900 * Initializes NRS head \a nrs of service partition \a svcpt, and registers all
901 * compatible policies in NRS core, with the NRS head.
903 * \param[in] nrs the NRS head
904 * \param[in] svcpt the PTLRPC service partition to setup
909 * \pre mutex_is_locked(&nrs_core.nrs_mutex)
911 static int nrs_svcpt_setup_locked0(struct ptlrpc_nrs *nrs,
912 struct ptlrpc_service_part *svcpt)
915 enum ptlrpc_nrs_queue_type queue;
917 LASSERT(mutex_is_locked(&nrs_core.nrs_mutex));
919 if (nrs == &svcpt->scp_nrs_reg)
920 queue = PTLRPC_NRS_QUEUE_REG;
921 else if (nrs == svcpt->scp_nrs_hp)
922 queue = PTLRPC_NRS_QUEUE_HP;
926 nrs->nrs_svcpt = svcpt;
927 nrs->nrs_queue_type = queue;
928 spin_lock_init(&nrs->nrs_lock);
929 INIT_LIST_HEAD(&nrs->nrs_policy_list);
930 INIT_LIST_HEAD(&nrs->nrs_policy_queued);
932 rc = nrs_register_policies_locked(nrs);
938 * Allocates a regular and optionally a high-priority NRS head (if the service
939 * handles high-priority RPCs), and then registers all available compatible
940 * policies on those NRS heads.
942 * \param[in,out] svcpt the PTLRPC service partition to setup
944 * \pre mutex_is_locked(&nrs_core.nrs_mutex)
946 static int nrs_svcpt_setup_locked(struct ptlrpc_service_part *svcpt)
948 struct ptlrpc_nrs *nrs;
951 LASSERT(mutex_is_locked(&nrs_core.nrs_mutex));
954 * Initialize the regular NRS head.
956 nrs = nrs_svcpt2nrs(svcpt, false);
957 rc = nrs_svcpt_setup_locked0(nrs, svcpt);
962 * Optionally allocate a high-priority NRS head.
964 if (svcpt->scp_service->srv_ops.so_hpreq_handler == NULL)
967 OBD_CPT_ALLOC_PTR(svcpt->scp_nrs_hp,
968 svcpt->scp_service->srv_cptable,
970 if (svcpt->scp_nrs_hp == NULL)
971 GOTO(out, rc = -ENOMEM);
973 nrs = nrs_svcpt2nrs(svcpt, true);
974 rc = nrs_svcpt_setup_locked0(nrs, svcpt);
981 * Unregisters all policies on all available NRS heads in a service partition;
982 * called at PTLRPC service unregistration time.
984 * \param[in] svcpt the PTLRPC service partition
986 * \pre mutex_is_locked(&nrs_core.nrs_mutex)
988 static void nrs_svcpt_cleanup_locked(struct ptlrpc_service_part *svcpt)
990 struct ptlrpc_nrs *nrs;
991 struct ptlrpc_nrs_policy *policy;
992 struct ptlrpc_nrs_policy *tmp;
996 LASSERT(mutex_is_locked(&nrs_core.nrs_mutex));
999 nrs = nrs_svcpt2nrs(svcpt, hp);
1000 nrs->nrs_stopping = 1;
1002 list_for_each_entry_safe(policy, tmp, &nrs->nrs_policy_list,
1004 rc = nrs_policy_unregister(nrs, policy->pol_desc->pd_name);
1009 * If the service partition has an HP NRS head, clean that up as well.
1011 if (!hp && nrs_svcpt_has_hp(svcpt)) {
1021 * Returns the descriptor for a policy as identified by by \a name.
1023 * \param[in] name the policy name
1025 * \retval the policy descriptor
1028 static struct ptlrpc_nrs_pol_desc *nrs_policy_find_desc_locked(const char *name)
1030 struct ptlrpc_nrs_pol_desc *tmp;
1032 list_for_each_entry(tmp, &nrs_core.nrs_policies, pd_list) {
1033 if (strncmp(tmp->pd_name, name, NRS_POL_NAME_MAX) == 0)
1040 * Removes the policy from all supported NRS heads of all partitions of all
1043 * \param[in] desc the policy descriptor to unregister
1046 * \retval 0 successfully unregistered policy on all supported NRS heads
1048 * \pre mutex_is_locked(&nrs_core.nrs_mutex)
1049 * \pre mutex_is_locked(&ptlrpc_all_services_mutex)
1051 static int nrs_policy_unregister_locked(struct ptlrpc_nrs_pol_desc *desc)
1053 struct ptlrpc_nrs *nrs;
1054 struct ptlrpc_service *svc;
1055 struct ptlrpc_service_part *svcpt;
1059 LASSERT(mutex_is_locked(&nrs_core.nrs_mutex));
1060 LASSERT(mutex_is_locked(&ptlrpc_all_services_mutex));
1062 list_for_each_entry(svc, &ptlrpc_all_services, srv_list) {
1064 if (!nrs_policy_compatible(svc, desc) ||
1065 unlikely(svc->srv_is_stopping))
1068 ptlrpc_service_for_each_part(svcpt, i, svc) {
1072 nrs = nrs_svcpt2nrs(svcpt, hp);
1073 rc = nrs_policy_unregister(nrs, desc->pd_name);
1075 * Ignore -ENOENT as the policy may not have registered
1076 * successfully on all service partitions.
1078 if (rc == -ENOENT) {
1080 } else if (rc != 0) {
1081 CERROR("Failed to unregister NRS policy %s for "
1082 "partition %d of service %s: %d\n",
1083 desc->pd_name, svcpt->scp_cpt,
1084 svcpt->scp_service->srv_name, rc);
1088 if (!hp && nrs_svc_has_hp(svc)) {
1094 if (desc->pd_ops->op_lprocfs_fini != NULL)
1095 desc->pd_ops->op_lprocfs_fini(svc);
1102 * Registers a new policy with NRS core.
1104 * The function will only succeed if policy registration with all compatible
1105 * service partitions (if any) is successful.
1107 * N.B. This function should be called either at ptlrpc module initialization
1108 * time when registering a policy that ships with NRS core, or in a
1109 * module's init() function for policies registering from other modules.
1111 * \param[in] conf configuration information for the new policy to register
1116 int ptlrpc_nrs_policy_register(struct ptlrpc_nrs_pol_conf *conf)
1118 struct ptlrpc_service *svc;
1119 struct ptlrpc_nrs_pol_desc *desc;
1122 LASSERT(conf != NULL);
1123 LASSERT(conf->nc_ops != NULL);
1124 LASSERT(conf->nc_compat != NULL);
1125 LASSERT(ergo(conf->nc_compat == nrs_policy_compat_one,
1126 conf->nc_compat_svc_name != NULL));
1127 LASSERT(ergo((conf->nc_flags & PTLRPC_NRS_FL_REG_EXTERN) != 0,
1128 conf->nc_owner != NULL));
1130 conf->nc_name[NRS_POL_NAME_MAX - 1] = '\0';
1133 * External policies are not allowed to start immediately upon
1134 * registration, as there is a relatively higher chance that their
1135 * registration might fail. In such a case, some policy instances may
1136 * already have requests queued wen unregistration needs to happen as
1137 * part o cleanup; since there is currently no way to drain requests
1138 * from a policy unless the service is unregistering, we just disallow
1141 if ((conf->nc_flags & PTLRPC_NRS_FL_REG_EXTERN) &&
1142 (conf->nc_flags & (PTLRPC_NRS_FL_FALLBACK |
1143 PTLRPC_NRS_FL_REG_START))) {
1144 CERROR("NRS: failing to register policy %s. Please check "
1145 "policy flags; external policies cannot act as fallback "
1146 "policies, or be started immediately upon registration "
1147 "without interaction with lprocfs\n", conf->nc_name);
1151 mutex_lock(&nrs_core.nrs_mutex);
1153 if (nrs_policy_find_desc_locked(conf->nc_name) != NULL) {
1154 CERROR("NRS: failing to register policy %s which has already "
1155 "been registered with NRS core!\n",
1157 GOTO(fail, rc = -EEXIST);
1160 OBD_ALLOC_PTR(desc);
1162 GOTO(fail, rc = -ENOMEM);
1164 strncpy(desc->pd_name, conf->nc_name, NRS_POL_NAME_MAX);
1165 desc->pd_ops = conf->nc_ops;
1166 desc->pd_compat = conf->nc_compat;
1167 desc->pd_compat_svc_name = conf->nc_compat_svc_name;
1168 if ((conf->nc_flags & PTLRPC_NRS_FL_REG_EXTERN) != 0)
1169 desc->pd_owner = conf->nc_owner;
1170 desc->pd_flags = conf->nc_flags;
1171 atomic_set(&desc->pd_refs, 0);
1174 * For policies that are held in the same module as NRS (currently
1175 * ptlrpc), do not register the policy with all compatible services,
1176 * as the services will not have started at this point, since we are
1177 * calling from ptlrpc module initialization code. In such cases each
1178 * service will register all compatible policies later, via
1179 * ptlrpc_service_nrs_setup().
1181 if ((conf->nc_flags & PTLRPC_NRS_FL_REG_EXTERN) == 0)
1185 * Register the new policy on all compatible services
1187 mutex_lock(&ptlrpc_all_services_mutex);
1189 list_for_each_entry(svc, &ptlrpc_all_services, srv_list) {
1190 struct ptlrpc_service_part *svcpt;
1194 if (!nrs_policy_compatible(svc, desc) ||
1195 unlikely(svc->srv_is_stopping))
1198 ptlrpc_service_for_each_part(svcpt, i, svc) {
1199 struct ptlrpc_nrs *nrs;
1202 nrs = nrs_svcpt2nrs(svcpt, hp);
1203 rc = nrs_policy_register(nrs, desc);
1205 CERROR("Failed to register NRS policy %s for "
1206 "partition %d of service %s: %d\n",
1207 desc->pd_name, svcpt->scp_cpt,
1208 svcpt->scp_service->srv_name, rc);
1210 rc2 = nrs_policy_unregister_locked(desc);
1212 * Should not fail at this point
1215 mutex_unlock(&ptlrpc_all_services_mutex);
1220 if (!hp && nrs_svc_has_hp(svc)) {
1227 * No need to take a reference to other modules here, as we
1228 * will be calling from the module's init() function.
1230 if (desc->pd_ops->op_lprocfs_init != NULL) {
1231 rc = desc->pd_ops->op_lprocfs_init(svc);
1233 rc2 = nrs_policy_unregister_locked(desc);
1235 * Should not fail at this point
1238 mutex_unlock(&ptlrpc_all_services_mutex);
1245 mutex_unlock(&ptlrpc_all_services_mutex);
1247 list_add_tail(&desc->pd_list, &nrs_core.nrs_policies);
1249 mutex_unlock(&nrs_core.nrs_mutex);
1253 EXPORT_SYMBOL(ptlrpc_nrs_policy_register);
1256 * Unregisters a previously registered policy with NRS core. All instances of
1257 * the policy on all NRS heads of all supported services are removed.
1259 * N.B. This function should only be called from a module's exit() function.
1260 * Although it can be used for policies that ship alongside NRS core, the
1261 * function is primarily intended for policies that register externally,
1262 * from other modules.
1264 * \param[in] conf configuration information for the policy to unregister
1269 int ptlrpc_nrs_policy_unregister(struct ptlrpc_nrs_pol_conf *conf)
1271 struct ptlrpc_nrs_pol_desc *desc;
1274 LASSERT(conf != NULL);
1276 if (conf->nc_flags & PTLRPC_NRS_FL_FALLBACK) {
1277 CERROR("Unable to unregister a fallback policy, unless the "
1278 "PTLRPC service is stopping.\n");
1282 conf->nc_name[NRS_POL_NAME_MAX - 1] = '\0';
1284 mutex_lock(&nrs_core.nrs_mutex);
1286 desc = nrs_policy_find_desc_locked(conf->nc_name);
1288 CERROR("Failing to unregister NRS policy %s which has "
1289 "not been registered with NRS core!\n",
1291 GOTO(not_exist, rc = -ENOENT);
1294 mutex_lock(&ptlrpc_all_services_mutex);
1296 rc = nrs_policy_unregister_locked(desc);
1299 CERROR("Please first stop policy %s on all service "
1300 "partitions and then retry to unregister the "
1301 "policy.\n", conf->nc_name);
1305 CDEBUG(D_INFO, "Unregistering policy %s from NRS core.\n",
1308 list_del(&desc->pd_list);
1312 mutex_unlock(&ptlrpc_all_services_mutex);
1315 mutex_unlock(&nrs_core.nrs_mutex);
1319 EXPORT_SYMBOL(ptlrpc_nrs_policy_unregister);
1322 * Setup NRS heads on all service partitions of service \a svc, and register
1323 * all compatible policies on those NRS heads.
1325 * To be called from withing ptl
1326 * \param[in] svc the service to setup
1328 * \retval -ve error, the calling logic should eventually call
1329 * ptlrpc_service_nrs_cleanup() to undo any work performed
1332 * \see ptlrpc_register_service()
1333 * \see ptlrpc_service_nrs_cleanup()
1335 int ptlrpc_service_nrs_setup(struct ptlrpc_service *svc)
1337 struct ptlrpc_service_part *svcpt;
1338 const struct ptlrpc_nrs_pol_desc *desc;
1342 mutex_lock(&nrs_core.nrs_mutex);
1345 * Initialize NRS heads on all service CPTs.
1347 ptlrpc_service_for_each_part(svcpt, i, svc) {
1348 rc = nrs_svcpt_setup_locked(svcpt);
1354 * Set up lprocfs interfaces for all supported policies for the
1357 list_for_each_entry(desc, &nrs_core.nrs_policies, pd_list) {
1358 if (!nrs_policy_compatible(svc, desc))
1361 if (desc->pd_ops->op_lprocfs_init != NULL) {
1362 rc = desc->pd_ops->op_lprocfs_init(svc);
1370 mutex_unlock(&nrs_core.nrs_mutex);
1376 * Unregisters all policies on all service partitions of service \a svc.
1378 * \param[in] svc the PTLRPC service to unregister
1380 void ptlrpc_service_nrs_cleanup(struct ptlrpc_service *svc)
1382 struct ptlrpc_service_part *svcpt;
1383 const struct ptlrpc_nrs_pol_desc *desc;
1386 mutex_lock(&nrs_core.nrs_mutex);
1389 * Clean up NRS heads on all service partitions
1391 ptlrpc_service_for_each_part(svcpt, i, svc)
1392 nrs_svcpt_cleanup_locked(svcpt);
1395 * Clean up lprocfs interfaces for all supported policies for the
1398 list_for_each_entry(desc, &nrs_core.nrs_policies, pd_list) {
1399 if (!nrs_policy_compatible(svc, desc))
1402 if (desc->pd_ops->op_lprocfs_fini != NULL)
1403 desc->pd_ops->op_lprocfs_fini(svc);
1406 mutex_unlock(&nrs_core.nrs_mutex);
1410 * Obtains NRS head resources for request \a req.
1412 * These could be either on the regular or HP NRS head of \a svcpt; resources
1413 * taken on the regular head can later be swapped for HP head resources by
1414 * ldlm_lock_reorder_req().
1416 * \param[in] svcpt the service partition
1417 * \param[in] req the request
1418 * \param[in] hp which NRS head of \a svcpt to use
1420 void ptlrpc_nrs_req_initialize(struct ptlrpc_service_part *svcpt,
1421 struct ptlrpc_request *req, bool hp)
1423 struct ptlrpc_nrs *nrs = nrs_svcpt2nrs(svcpt, hp);
1425 memset(&req->rq_nrq, 0, sizeof(req->rq_nrq));
1426 nrs_resource_get_safe(nrs, &req->rq_nrq, req->rq_nrq.nr_res_ptrs,
1430 * It is fine to access \e nr_initialized without locking as there is
1431 * no contention at this early stage.
1433 req->rq_nrq.nr_initialized = 1;
1437 * Releases resources for a request; is called after the request has been
1440 * \param[in] req the request
1442 * \see ptlrpc_server_finish_request()
1444 void ptlrpc_nrs_req_finalize(struct ptlrpc_request *req)
1446 if (req->rq_nrq.nr_initialized) {
1447 nrs_resource_put_safe(req->rq_nrq.nr_res_ptrs);
1448 /* no protection on bit nr_initialized because no
1449 * contention at this late stage */
1450 req->rq_nrq.nr_finalized = 1;
1454 void ptlrpc_nrs_req_stop_nolock(struct ptlrpc_request *req)
1456 if (req->rq_nrq.nr_started)
1457 nrs_request_stop(&req->rq_nrq);
1461 * Enqueues request \a req on either the regular or high-priority NRS head
1462 * of service partition \a svcpt.
1464 * \param[in] svcpt the service partition
1465 * \param[in] req the request to be enqueued
1466 * \param[in] hp whether to enqueue the request on the regular or
1467 * high-priority NRS head.
1469 void ptlrpc_nrs_req_add(struct ptlrpc_service_part *svcpt,
1470 struct ptlrpc_request *req, bool hp)
1472 spin_lock(&svcpt->scp_req_lock);
1475 ptlrpc_nrs_hpreq_add_nolock(req);
1477 ptlrpc_nrs_req_add_nolock(req);
1479 spin_unlock(&svcpt->scp_req_lock);
1482 static void nrs_request_removed(struct ptlrpc_nrs_policy *policy)
1484 LASSERT(policy->pol_nrs->nrs_req_queued > 0);
1485 LASSERT(policy->pol_req_queued > 0);
1487 policy->pol_nrs->nrs_req_queued--;
1488 policy->pol_req_queued--;
1491 * If the policy has no more requests queued, remove it from
1492 * ptlrpc_nrs::nrs_policy_queued.
1494 if (unlikely(policy->pol_req_queued == 0)) {
1495 list_del_init(&policy->pol_list_queued);
1498 * If there are other policies with queued requests, move the
1499 * current policy to the end so that we can round robin over
1500 * all policies and drain the requests.
1502 } else if (policy->pol_req_queued != policy->pol_nrs->nrs_req_queued) {
1503 LASSERT(policy->pol_req_queued <
1504 policy->pol_nrs->nrs_req_queued);
1506 list_move_tail(&policy->pol_list_queued,
1507 &policy->pol_nrs->nrs_policy_queued);
1512 * Obtains a request for handling from an NRS head of service partition
1515 * \param[in] svcpt the service partition
1516 * \param[in] hp whether to obtain a request from the regular or
1517 * high-priority NRS head.
1518 * \param[in] peek when set, signifies that we just want to examine the
1519 * request, and not handle it, so the request is not removed
1521 * \param[in] force when set, it will force a policy to return a request if it
1524 * \retval the request to be handled
1525 * \retval NULL the head has no requests to serve
1527 struct ptlrpc_request *
1528 ptlrpc_nrs_req_get_nolock0(struct ptlrpc_service_part *svcpt, bool hp,
1529 bool peek, bool force)
1531 struct ptlrpc_nrs *nrs = nrs_svcpt2nrs(svcpt, hp);
1532 struct ptlrpc_nrs_policy *policy;
1533 struct ptlrpc_nrs_request *nrq;
1536 * Always try to drain requests from all NRS polices even if they are
1537 * inactive, because the user can change policy status at runtime.
1539 list_for_each_entry(policy, &nrs->nrs_policy_queued,
1541 nrq = nrs_request_get(policy, peek, force);
1543 if (likely(!peek)) {
1544 nrq->nr_started = 1;
1546 policy->pol_req_started++;
1547 policy->pol_nrs->nrs_req_started++;
1549 nrs_request_removed(policy);
1552 return container_of(nrq, struct ptlrpc_request, rq_nrq);
1560 * Dequeues request \a req from the policy it has been enqueued on.
1562 * \param[in] req the request
1564 void ptlrpc_nrs_req_del_nolock(struct ptlrpc_request *req)
1566 struct ptlrpc_nrs_policy *policy = nrs_request_policy(&req->rq_nrq);
1568 policy->pol_desc->pd_ops->op_req_dequeue(policy, &req->rq_nrq);
1570 req->rq_nrq.nr_enqueued = 0;
1572 nrs_request_removed(policy);
1576 * Returns whether there are any requests currently enqueued on any of the
1577 * policies of service partition's \a svcpt NRS head specified by \a hp. Should
1578 * be called while holding ptlrpc_service_part::scp_req_lock to get a reliable
1581 * \param[in] svcpt the service partition to enquire.
1582 * \param[in] hp whether the regular or high-priority NRS head is to be
1585 * \retval false the indicated NRS head has no enqueued requests.
1586 * \retval true the indicated NRS head has some enqueued requests.
1588 bool ptlrpc_nrs_req_pending_nolock(struct ptlrpc_service_part *svcpt, bool hp)
1590 struct ptlrpc_nrs *nrs = nrs_svcpt2nrs(svcpt, hp);
1592 return nrs->nrs_req_queued > 0;
1596 * Moves request \a req from the regular to the high-priority NRS head.
1598 * \param[in] req the request to move
1600 void ptlrpc_nrs_req_hp_move(struct ptlrpc_request *req)
1602 struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt;
1603 struct ptlrpc_nrs_request *nrq = &req->rq_nrq;
1604 struct ptlrpc_nrs_resource *res1[NRS_RES_MAX];
1605 struct ptlrpc_nrs_resource *res2[NRS_RES_MAX];
1608 * Obtain the high-priority NRS head resources.
1610 nrs_resource_get_safe(nrs_svcpt2nrs(svcpt, true), nrq, res1, true);
1612 spin_lock(&svcpt->scp_req_lock);
1614 if (!ptlrpc_nrs_req_can_move(req))
1617 ptlrpc_nrs_req_del_nolock(req);
1619 memcpy(res2, nrq->nr_res_ptrs, NRS_RES_MAX * sizeof(res2[0]));
1620 memcpy(nrq->nr_res_ptrs, res1, NRS_RES_MAX * sizeof(res1[0]));
1622 ptlrpc_nrs_hpreq_add_nolock(req);
1624 memcpy(res1, res2, NRS_RES_MAX * sizeof(res1[0]));
1626 spin_unlock(&svcpt->scp_req_lock);
1629 * Release either the regular NRS head resources if we moved the
1630 * request, or the high-priority NRS head resources if we took a
1631 * reference earlier in this function and ptlrpc_nrs_req_can_move()
1634 nrs_resource_put_safe(res1);
1638 * Carries out a control operation \a opc on the policy identified by the
1639 * human-readable \a name, on either all partitions, or only on the first
1640 * partition of service \a svc.
1642 * \param[in] svc the service the policy belongs to.
1643 * \param[in] queue whether to carry out the command on the policy which
1644 * belongs to the regular, high-priority, or both NRS
1645 * heads of service partitions of \a svc.
1646 * \param[in] name the policy to act upon, by human-readable name
1647 * \param[in] opc the opcode of the operation to carry out
1648 * \param[in] single when set, the operation will only be carried out on the
1649 * NRS heads of the first service partition of \a svc.
1650 * This is useful for some policies which e.g. share
1651 * identical values on the same parameters of different
1652 * service partitions; when reading these parameters via
1653 * lprocfs, these policies may just want to obtain and
1654 * print out the values from the first service partition.
1655 * Storing these values centrally elsewhere then could be
1656 * another solution for this.
1657 * \param[in,out] arg can be used as a generic in/out buffer between control
1658 * operations and the user environment.
1660 *\retval -ve error condition
1661 *\retval 0 operation was carried out successfully
1663 int ptlrpc_nrs_policy_control(const struct ptlrpc_service *svc,
1664 enum ptlrpc_nrs_queue_type queue, char *name,
1665 enum ptlrpc_nrs_ctl opc, bool single, void *arg)
1667 struct ptlrpc_service_part *svcpt;
1671 LASSERT(opc != PTLRPC_NRS_CTL_INVALID);
1673 if ((queue & PTLRPC_NRS_QUEUE_BOTH) == 0)
1676 ptlrpc_service_for_each_part(svcpt, i, svc) {
1677 if ((queue & PTLRPC_NRS_QUEUE_REG) != 0) {
1678 rc = nrs_policy_ctl(nrs_svcpt2nrs(svcpt, false), name,
1680 if (rc != 0 || (queue == PTLRPC_NRS_QUEUE_REG &&
1685 if ((queue & PTLRPC_NRS_QUEUE_HP) != 0) {
1687 * XXX: We could optionally check for
1688 * nrs_svc_has_hp(svc) here, and return an error if it
1689 * is false. Right now we rely on the policies' lprocfs
1690 * handlers that call the present function to make this
1691 * check; if they fail to do so, they might hit the
1692 * assertion inside nrs_svcpt2nrs() below.
1694 rc = nrs_policy_ctl(nrs_svcpt2nrs(svcpt, true), name,
1696 if (rc != 0 || single)
1705 /* ptlrpc/nrs_fifo.c */
1706 extern struct ptlrpc_nrs_pol_conf nrs_conf_fifo;
1709 * Adds all policies that ship with the ptlrpc module, to NRS core's list of
1710 * policies \e nrs_core.nrs_policies.
1712 * \retval 0 all policies have been registered successfully
1715 int ptlrpc_nrs_init(void)
1719 mutex_init(&nrs_core.nrs_mutex);
1720 INIT_LIST_HEAD(&nrs_core.nrs_policies);
1722 rc = ptlrpc_nrs_policy_register(&nrs_conf_fifo);
1730 * Since no PTLRPC services have been started at this point, all we need
1731 * to do for cleanup is to free the descriptors.
1739 * Removes all policy desciptors from nrs_core::nrs_policies, and frees the
1740 * policy descriptors.
1742 * Since all PTLRPC services are stopped at this point, there are no more
1743 * instances of any policies, because each service will have stopped its policy
1744 * instances in ptlrpc_service_nrs_cleanup(), so we just need to free the
1747 void ptlrpc_nrs_fini(void)
1749 struct ptlrpc_nrs_pol_desc *desc;
1750 struct ptlrpc_nrs_pol_desc *tmp;
1752 list_for_each_entry_safe(desc, tmp, &nrs_core.nrs_policies,
1754 list_del_init(&desc->pd_list);