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, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 021110-1307, USA
24 * Copyright (c) 2012, 2017, Intel Corporation.
25 * Use is subject to license terms.
27 * Author: Johann Lombardi <johann.lombardi@intel.com>
28 * Author: Niu Yawei <yawei.niu@intel.com>
31 #define DEBUG_SUBSYSTEM S_LQUOTA
33 #include <linux/kthread.h>
35 #include <lustre_dlm.h>
36 #include <lustre_swab.h>
37 #include <obd_class.h>
39 #include "qmt_internal.h"
41 /* intent policy function called from mdt_intent_opc() when the intent is of
43 int qmt_intent_policy(const struct lu_env *env, struct lu_device *ld,
44 struct ptlrpc_request *req, struct ldlm_lock **lockp,
47 struct qmt_device *qmt = lu2qmt_dev(ld);
48 struct ldlm_intent *it;
49 struct quota_body *reqbody;
50 struct quota_body *repbody;
51 struct obd_uuid *uuid;
52 struct lquota_lvb *lvb;
53 struct ldlm_resource *res = (*lockp)->l_resource;
54 struct ldlm_reply *ldlm_rep;
58 req_capsule_extend(&req->rq_pill, &RQF_LDLM_INTENT_QUOTA);
59 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
60 ldlm_lvbo_size(*lockp));
62 /* extract quota body and intent opc */
63 it = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT);
65 RETURN(err_serious(-EFAULT));
67 reqbody = req_capsule_client_get(&req->rq_pill, &RMF_QUOTA_BODY);
69 RETURN(err_serious(-EFAULT));
72 rc = req_capsule_server_pack(&req->rq_pill);
74 CERROR("Can't pack response, rc %d\n", rc);
75 RETURN(err_serious(rc));
78 repbody = req_capsule_server_get(&req->rq_pill, &RMF_QUOTA_BODY);
80 RETURN(err_serious(-EFAULT));
82 ldlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
84 RETURN(err_serious(-EFAULT));
86 uuid = &(*lockp)->l_export->exp_client_uuid;
89 case IT_QUOTA_DQACQ: {
90 struct lquota_entry *lqe;
91 struct ldlm_lock *lock;
93 if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] == 0)
94 /* acquire on global lock? something is wrong ... */
95 GOTO(out, rc = -EPROTO);
97 /* verify global lock isn't stale */
98 if (!lustre_handle_is_used(&reqbody->qb_glb_lockh))
99 GOTO(out, rc = -ENOLCK);
101 lock = ldlm_handle2lock(&reqbody->qb_glb_lockh);
103 GOTO(out, rc = -ENOLCK);
106 lqe = res->lr_lvb_data;
107 LASSERT(lqe != NULL);
110 /* acquire quota space */
111 rc = qmt_dqacq0(env, lqe, qmt, uuid, reqbody->qb_flags,
112 reqbody->qb_count, reqbody->qb_usage,
121 /* new connection from slave */
123 if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] != 0)
124 /* connection on per-ID lock? something is wrong ... */
125 GOTO(out, rc = -EPROTO);
127 rc = qmt_pool_new_conn(env, qmt, &reqbody->qb_fid,
128 &repbody->qb_slv_fid,
129 &repbody->qb_slv_ver, uuid);
135 CERROR("%s: invalid intent opcode: %llu\n", qmt->qmt_svname,
137 GOTO(out, rc = -EINVAL);
140 /* on success, pack lvb in reply */
141 lvb = req_capsule_server_get(&req->rq_pill, &RMF_DLM_LVB);
142 lvb_len = ldlm_lvbo_size(*lockp);
143 lvb_len = ldlm_lvbo_fill(*lockp, lvb, &lvb_len);
145 GOTO(out, rc = lvb_len);
147 req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, lvb_len, RCL_SERVER);
149 ldlm_rep->lock_policy_res2 = clear_serious(rc);
155 * Initialize quota LVB associated with quota indexes.
156 * Called with res->lr_lvb_sem held
158 int qmt_lvbo_init(struct lu_device *ld, struct ldlm_resource *res)
161 struct qmt_thread_info *qti;
162 struct qmt_device *qmt = lu2qmt_dev(ld);
163 int pool_type, qtype;
167 LASSERT(res != NULL);
169 if (res->lr_type != LDLM_PLAIN)
172 if (res->lr_lvb_data ||
173 res->lr_name.name[LUSTRE_RES_ID_SEQ_OFF] != FID_SEQ_QUOTA_GLB)
180 /* extract global index FID and quota identifier */
181 fid_extract_from_quota_res(&qti->qti_fid, &qti->qti_id, &res->lr_name);
183 /* sanity check the global index FID */
184 rc = lquota_extract_fid(&qti->qti_fid, &pool_type, &qtype);
186 CERROR("can't extract glb index information from FID "DFID"\n",
187 PFID(&qti->qti_fid));
191 if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] != 0) {
192 /* no ID quota lock associated with UID/GID 0 or with a seq 0,
193 * we are thus dealing with an ID lock. */
194 struct lquota_entry *lqe;
196 /* Find the quota entry associated with the quota id */
197 lqe = qmt_pool_lqe_lookup(env, qmt, pool_type, qtype,
200 GOTO(out, rc = PTR_ERR(lqe));
202 /* store reference to lqe in lr_lvb_data */
203 res->lr_lvb_data = lqe;
204 LQUOTA_DEBUG(lqe, "initialized res lvb");
206 struct dt_object *obj;
208 /* lookup global index */
209 obj = dt_locate(env, qmt->qmt_child, &qti->qti_fid);
211 GOTO(out, rc = PTR_ERR(obj));
212 if (!dt_object_exists(obj)) {
213 dt_object_put(env, obj);
214 GOTO(out, rc = -ENOENT);
217 /* store reference to global index object in lr_lvb_data */
218 res->lr_lvb_data = obj;
219 CDEBUG(D_QUOTA, DFID" initialized lvb\n", PFID(&qti->qti_fid));
222 res->lr_lvb_len = sizeof(struct lquota_lvb);
229 * Update LVB associated with the global quota index.
230 * This function is called from the DLM itself after a glimpse callback, in this
231 * case valid ptlrpc request is passed.
233 int qmt_lvbo_update(struct lu_device *ld, struct ldlm_resource *res,
234 struct ptlrpc_request *req, int increase_only)
237 struct qmt_thread_info *qti;
238 struct qmt_device *qmt = lu2qmt_dev(ld);
239 struct lquota_entry *lqe;
240 struct lquota_lvb *lvb;
241 struct ldlm_lock *lock;
242 struct obd_export *exp;
246 LASSERT(res != NULL);
251 if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] == 0)
252 /* no need to update lvb for global quota locks */
255 lvb = req_capsule_server_swab_get(&req->rq_pill, &RMF_DLM_LVB,
256 lustre_swab_lquota_lvb);
258 CERROR("%s: failed to extract lvb from request\n",
263 lqe = res->lr_lvb_data;
264 LASSERT(lqe != NULL);
267 LQUOTA_DEBUG(lqe, "releasing:%llu may release:%llu",
268 lvb->lvb_id_rel, lvb->lvb_id_may_rel);
270 if (lvb->lvb_id_rel == 0) {
271 /* nothing to release */
272 if (lvb->lvb_id_may_rel != 0)
273 /* but might still release later ... */
274 lqe->lqe_may_rel += lvb->lvb_id_may_rel;
278 /* allocate environement */
283 /* The request is a glimpse callback which was sent via the
284 * reverse import to the slave. What we care about here is the
285 * export associated with the slave and req->rq_export is
286 * definitely not what we are looking for (it is actually set to
288 * Therefore we extract the lock from the request argument
289 * and use lock->l_export. */
290 lock = ldlm_request_lock(req);
292 CERROR("%s: failed to get lock from request!\n",
294 GOTO(out, rc = PTR_ERR(lock));
297 exp = class_export_get(lock->l_export);
299 CERROR("%s: failed to get export from lock!\n",
301 GOTO(out, rc = -EFAULT);
304 /* release quota space */
305 rc = qmt_dqacq0(env, lqe, qmt, &exp->exp_client_uuid,
306 QUOTA_DQACQ_FL_REL, lvb->lvb_id_rel, 0, &qti->qti_body);
307 if (rc || qti->qti_body.qb_count != lvb->lvb_id_rel)
308 LQUOTA_ERROR(lqe, "failed to release quota space on glimpse "
309 "%llu!=%llu : rc = %d\n", qti->qti_body.qb_count,
310 lvb->lvb_id_rel, rc);
311 class_export_put(exp);
321 * Report size of lvb to ldlm layer in order to allocate lvb buffer
322 * As far as quota locks are concerned, the size is static and is the same
323 * for both global and per-ID locks which shares the same lvb format.
325 int qmt_lvbo_size(struct lu_device *ld, struct ldlm_lock *lock)
327 return sizeof(struct lquota_lvb);
331 * Fill request buffer with quota lvb
333 int qmt_lvbo_fill(struct lu_device *ld, struct ldlm_lock *lock, void *lvb,
336 struct ldlm_resource *res = lock->l_resource;
337 struct lquota_lvb *qlvb = lvb;
340 LASSERT(res != NULL);
342 if (res->lr_type != LDLM_PLAIN || res->lr_lvb_data == NULL ||
343 res->lr_name.name[LUSTRE_RES_ID_SEQ_OFF] != FID_SEQ_QUOTA_GLB)
346 if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] != 0) {
347 /* no ID quota lock associated with UID/GID 0 or with a seq 0,
348 * we are thus dealing with an ID lock. */
349 struct lquota_entry *lqe = res->lr_lvb_data;
351 /* return current qunit value & edquot flags in lvb */
353 qlvb->lvb_id_qunit = lqe->lqe_qunit;
356 qlvb->lvb_flags = LQUOTA_FL_EDQUOT;
359 /* global quota lock */
360 struct dt_object *obj = res->lr_lvb_data;
362 /* return current version of global index */
363 qlvb->lvb_glb_ver = dt_version_get(lu_env_find(), obj);
366 RETURN(sizeof(struct lquota_lvb));
370 * Free lvb associated with a given ldlm resource
371 * we don't really allocate a lvb, lr_lvb_data just points to
372 * the appropriate backend structures.
374 int qmt_lvbo_free(struct lu_device *ld, struct ldlm_resource *res)
378 if (res->lr_lvb_data == NULL)
381 if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] != 0) {
382 struct lquota_entry *lqe = res->lr_lvb_data;
384 /* release lqe reference */
387 struct dt_object *obj = res->lr_lvb_data;
388 /* release object reference */
389 dt_object_put(lu_env_find(), obj);
392 res->lr_lvb_data = NULL;
398 typedef int (*qmt_glimpse_cb_t)(struct ldlm_lock *, void *);
400 struct qmt_gl_lock_array {
403 struct ldlm_lock **q_locks;
406 static void qmt_free_lock_array(struct qmt_gl_lock_array *array)
410 if (array->q_max == 0) {
411 LASSERT(array->q_locks == NULL);
415 for (i = 0; i < array->q_cnt; i++) {
416 LASSERT(array->q_locks[i]);
417 LDLM_LOCK_RELEASE(array->q_locks[i]);
418 array->q_locks[i] = NULL;
421 OBD_FREE(array->q_locks, array->q_max * sizeof(*array->q_locks));
422 array->q_locks = NULL;
426 static int qmt_alloc_lock_array(struct ldlm_resource *res,
427 struct qmt_gl_lock_array *array,
428 qmt_glimpse_cb_t cb, void *arg)
430 struct list_head *pos;
431 unsigned long count = 0;
435 LASSERT(!array->q_max && !array->q_cnt && !array->q_locks);
438 /* scan list of granted locks */
439 list_for_each(pos, &res->lr_granted) {
440 struct ldlm_lock *lock;
443 lock = list_entry(pos, struct ldlm_lock, l_res_link);
444 LASSERT(lock->l_export);
448 /* slave should not be notified */
454 if (array->q_max != 0 && array->q_cnt < array->q_max) {
455 array->q_locks[array->q_cnt] = LDLM_LOCK_GET(lock);
461 if (count > array->q_max) {
462 qmt_free_lock_array(array);
466 * allocate more slots in case of more qualified locks are
467 * found during next loop
469 array->q_max = count + count / 2 + 10;
471 LASSERT(array->q_locks == NULL && array->q_cnt == 0);
472 OBD_ALLOC(array->q_locks,
473 sizeof(*array->q_locks) * array->q_max);
474 if (array->q_locks == NULL) {
485 * Send glimpse callback to slaves holding a lock on resource \res.
486 * This is used to notify slaves of new quota settings or to claim quota space
489 * \param env - is the environment passed by the caller
490 * \param qmt - is the quota master target
491 * \param res - is the dlm resource associated with the quota object
492 * \param desc - is the glimpse descriptor to pack in glimpse callback
493 * \param cb - is the callback function called on every lock and determine
494 * whether a glimpse should be issued
495 * \param arg - is an opaq parameter passed to the callback function
497 static int qmt_glimpse_lock(const struct lu_env *env, struct qmt_device *qmt,
498 struct ldlm_resource *res, union ldlm_gl_desc *desc,
499 qmt_glimpse_cb_t cb, void *arg)
501 struct list_head *tmp, *pos;
503 struct qmt_gl_lock_array locks;
508 memset(&locks, 0, sizeof(locks));
509 rc = qmt_alloc_lock_array(res, &locks, cb, arg);
511 CERROR("%s: failed to allocate glimpse lock array (%d)\n",
512 qmt->qmt_svname, rc);
516 for (i = locks.q_cnt; i > 0; i--) {
517 struct ldlm_glimpse_work *work;
521 CERROR("%s: failed to notify a lock.\n",
526 list_add_tail(&work->gl_list, &gl_list);
527 work->gl_lock = locks.q_locks[i - 1];
529 work->gl_desc = desc;
531 locks.q_locks[i - 1] = NULL;
535 qmt_free_lock_array(&locks);
537 if (list_empty(&gl_list)) {
538 CDEBUG(D_QUOTA, "%s: nobody to notify\n", qmt->qmt_svname);
542 /* issue glimpse callbacks to all connected slaves */
543 rc = ldlm_glimpse_locks(res, &gl_list);
545 list_for_each_safe(pos, tmp, &gl_list) {
546 struct ldlm_glimpse_work *work;
548 work = list_entry(pos, struct ldlm_glimpse_work, gl_list);
550 list_del(&work->gl_list);
551 CERROR("%s: failed to notify %s of new quota settings\n",
553 obd_uuid2str(&work->gl_lock->l_export->exp_client_uuid));
554 LDLM_LOCK_RELEASE(work->gl_lock);
562 * Send glimpse request to all global quota locks to push new quota setting to
565 * \param env - is the environment passed by the caller
566 * \param lqe - is the lquota entry which has new settings
567 * \param ver - is the version associated with the setting change
569 void qmt_glb_lock_notify(const struct lu_env *env, struct lquota_entry *lqe,
572 struct qmt_thread_info *qti = qmt_info(env);
573 struct qmt_pool_info *pool = lqe2qpi(lqe);
574 struct ldlm_resource *res = NULL;
577 lquota_generate_fid(&qti->qti_fid, pool->qpi_rtype,
578 lqe->lqe_site->lqs_qtype);
580 /* send glimpse callback to notify slaves of new quota settings */
581 qti->qti_gl_desc.lquota_desc.gl_id = lqe->lqe_id;
582 qti->qti_gl_desc.lquota_desc.gl_flags = 0;
583 if (lqe->lqe_is_default) {
584 qti->qti_gl_desc.lquota_desc.gl_hardlimit = 0;
585 qti->qti_gl_desc.lquota_desc.gl_softlimit = 0;
586 qti->qti_gl_desc.lquota_desc.gl_time = LQUOTA_GRACE_FLAG(0,
587 LQUOTA_FLAG_DEFAULT);
590 qti->qti_gl_desc.lquota_desc.gl_hardlimit = lqe->lqe_hardlimit;
591 qti->qti_gl_desc.lquota_desc.gl_softlimit = lqe->lqe_softlimit;
592 qti->qti_gl_desc.lquota_desc.gl_time = lqe->lqe_gracetime;
594 qti->qti_gl_desc.lquota_desc.gl_ver = ver;
596 /* look up ldlm resource associated with global index */
597 fid_build_reg_res_name(&qti->qti_fid, &qti->qti_resid);
598 res = ldlm_resource_get(pool->qpi_qmt->qmt_ns, NULL, &qti->qti_resid,
601 /* this might happen if no slaves have enqueued global quota
603 LQUOTA_DEBUG(lqe, "failed to lookup ldlm resource associated "
604 "with "DFID, PFID(&qti->qti_fid));
608 qmt_glimpse_lock(env, pool->qpi_qmt, res, &qti->qti_gl_desc,
610 ldlm_resource_putref(res);
614 /* Callback function used to select locks that should be glimpsed when
615 * broadcasting the new qunit value */
616 static int qmt_id_lock_cb(struct ldlm_lock *lock, void *arg)
618 struct obd_uuid *slv_uuid = arg;
619 struct obd_uuid *uuid = &lock->l_export->exp_client_uuid;
621 if (slv_uuid != NULL && obd_uuid_equals(uuid, slv_uuid))
627 * Send glimpse request on per-ID lock to push new qunit value to slave.
629 * \param env - is the environment passed by the caller
630 * \param qmt - is the quota master target device
631 * \param lqe - is the lquota entry with the new qunit value
632 * \param uuid - is the uuid of the slave acquiring space, if any
634 static void qmt_id_lock_glimpse(const struct lu_env *env,
635 struct qmt_device *qmt,
636 struct lquota_entry *lqe, struct obd_uuid *uuid)
638 struct qmt_thread_info *qti = qmt_info(env);
639 struct qmt_pool_info *pool = lqe2qpi(lqe);
640 struct ldlm_resource *res = NULL;
643 if (!lqe->lqe_enforced)
646 lquota_generate_fid(&qti->qti_fid, pool->qpi_rtype,
647 lqe->lqe_site->lqs_qtype);
648 fid_build_quota_res_name(&qti->qti_fid, &lqe->lqe_id, &qti->qti_resid);
649 res = ldlm_resource_get(qmt->qmt_ns, NULL, &qti->qti_resid, LDLM_PLAIN,
652 /* this might legitimately happens if slaves haven't had the
653 * opportunity to enqueue quota lock yet. */
654 LQUOTA_DEBUG(lqe, "failed to lookup ldlm resource for per-ID "
655 "lock "DFID, PFID(&qti->qti_fid));
657 if (lqe->lqe_revoke_time == 0 &&
658 lqe->lqe_qunit == pool->qpi_least_qunit)
659 lqe->lqe_revoke_time = ktime_get_seconds();
660 lqe_write_unlock(lqe);
665 /* The purpose of glimpse callback on per-ID lock is twofold:
666 * - notify slaves of new qunit value and hope they will release some
667 * spare quota space in return
668 * - notify slaves that master ran out of quota space and there is no
669 * need to send acquire request any more until further notice */
671 /* fill glimpse descriptor with lqe settings */
673 qti->qti_gl_desc.lquota_desc.gl_flags = LQUOTA_FL_EDQUOT;
675 qti->qti_gl_desc.lquota_desc.gl_flags = 0;
676 qti->qti_gl_desc.lquota_desc.gl_qunit = lqe->lqe_qunit;
678 if (lqe->lqe_revoke_time == 0 &&
679 qti->qti_gl_desc.lquota_desc.gl_qunit == pool->qpi_least_qunit)
680 /* reset lqe_may_rel, it will be updated on glimpse callback
681 * replies if needed */
682 lqe->lqe_may_rel = 0;
684 /* The rebalance thread is the only thread which can issue glimpses */
685 LASSERT(!lqe->lqe_gl);
687 lqe_write_unlock(lqe);
689 /* issue glimpse callback to slaves */
690 qmt_glimpse_lock(env, qmt, res, &qti->qti_gl_desc,
691 uuid ? qmt_id_lock_cb : NULL, (void *)uuid);
694 if (lqe->lqe_revoke_time == 0 &&
695 qti->qti_gl_desc.lquota_desc.gl_qunit == pool->qpi_least_qunit &&
696 lqe->lqe_qunit == pool->qpi_least_qunit) {
697 lqe->lqe_revoke_time = ktime_get_seconds();
698 qmt_adjust_edquot(lqe, ktime_get_real_seconds());
700 LASSERT(lqe->lqe_gl);
702 lqe_write_unlock(lqe);
704 ldlm_resource_putref(res);
709 * Schedule a glimpse request on per-ID locks to push new qunit value or
710 * edquot flag to quota slaves.
712 * \param qmt - is the quota master target device
713 * \param lqe - is the lquota entry with the new qunit value
715 void qmt_id_lock_notify(struct qmt_device *qmt, struct lquota_entry *lqe)
721 spin_lock(&qmt->qmt_reba_lock);
722 if (!qmt->qmt_stopping && list_empty(&lqe->lqe_link)) {
723 list_add_tail(&lqe->lqe_link, &qmt->qmt_reba_list);
726 spin_unlock(&qmt->qmt_reba_lock);
729 wake_up(&qmt->qmt_reba_thread.t_ctl_waitq);
736 * The rebalance thread is in charge of sending glimpse callbacks on per-ID
737 * quota locks owned by slaves in order to notify them of:
738 * - a qunit shrink in which case slaves might release quota space back in
740 * - set/clear edquot flag used to cache the "quota exhausted" state of the
741 * master. When the flag is set, slaves know that there is no need to
742 * try to acquire quota from the master since this latter has already
743 * distributed all the space.
745 static int qmt_reba_thread(void *arg)
747 struct qmt_device *qmt = (struct qmt_device *)arg;
748 struct ptlrpc_thread *thread = &qmt->qmt_reba_thread;
750 struct lquota_entry *lqe, *tmp;
756 thread_set_flags(thread, SVC_STOPPED);
760 rc = lu_env_init(env, LCT_MD_THREAD);
762 CERROR("%s: failed to init env.", qmt->qmt_svname);
765 rc = lu_env_add(env);
767 GOTO(out_env_fini, rc);
769 thread_set_flags(thread, SVC_RUNNING);
770 wake_up(&thread->t_ctl_waitq);
773 wait_event_idle(thread->t_ctl_waitq,
774 !list_empty(&qmt->qmt_reba_list) ||
775 !thread_is_running(thread));
777 spin_lock(&qmt->qmt_reba_lock);
778 list_for_each_entry_safe(lqe, tmp, &qmt->qmt_reba_list,
780 list_del_init(&lqe->lqe_link);
781 spin_unlock(&qmt->qmt_reba_lock);
783 if (thread_is_running(thread))
784 qmt_id_lock_glimpse(env, qmt, lqe, NULL);
787 spin_lock(&qmt->qmt_reba_lock);
789 spin_unlock(&qmt->qmt_reba_lock);
791 if (!thread_is_running(thread))
799 thread_set_flags(thread, SVC_STOPPED);
800 wake_up(&thread->t_ctl_waitq);
805 * Start rebalance thread. Called when the QMT is being setup
807 int qmt_start_reba_thread(struct qmt_device *qmt)
809 struct ptlrpc_thread *thread = &qmt->qmt_reba_thread;
810 struct task_struct *task;
813 task = kthread_run(qmt_reba_thread, (void *)qmt,
814 "qmt_reba_%s", qmt->qmt_svname);
816 CERROR("%s: failed to start rebalance thread (%ld)\n",
817 qmt->qmt_svname, PTR_ERR(task));
818 thread_set_flags(thread, SVC_STOPPED);
819 RETURN(PTR_ERR(task));
822 wait_event_idle(thread->t_ctl_waitq,
823 thread_is_running(thread) || thread_is_stopped(thread));
829 * Stop rebalance thread. Called when the QMT is about to shutdown.
831 void qmt_stop_reba_thread(struct qmt_device *qmt)
833 struct ptlrpc_thread *thread = &qmt->qmt_reba_thread;
835 if (!thread_is_stopped(thread)) {
837 thread_set_flags(thread, SVC_STOPPING);
838 wake_up(&thread->t_ctl_waitq);
840 wait_event_idle(thread->t_ctl_waitq, thread_is_stopped(thread));
842 LASSERT(list_empty(&qmt->qmt_reba_list));