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, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, 2014, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/osp/osp_sync.c
38 * Lustre OST Proxy Device
40 * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
41 * Author: Mikhail Pershin <mike.pershin@intel.com>
42 * Author: Di Wang <di.wang@intel.com>
45 #define DEBUG_SUBSYSTEM S_MDS
47 #include <linux/kthread.h>
48 #include "osp_internal.h"
51 * there are two specific states to take care about:
53 * = import is disconnected =
55 * = import is inactive =
56 * in this case osp_declare_object_create() returns an error
62 * Check whether statfs data is expired
64 * OSP device caches statfs data for the target, the function checks
65 * whether the data is expired or not.
67 * \param[in] d OSP device
69 * \retval 0 - not expired, 1 - expired
71 static inline int osp_statfs_need_update(struct osp_device *d)
73 return !cfs_time_before(cfs_time_current(),
74 d->opd_statfs_fresh_till);
78 * OSP tries to maintain pool of available objects so that calls to create
79 * objects don't block most of time
81 * each time OSP gets connected to OST, we should start from precreation cleanup
83 static inline bool osp_precreate_running(struct osp_device *d)
85 return !!(d->opd_pre_thread.t_flags & SVC_RUNNING);
88 static inline bool osp_precreate_stopped(struct osp_device *d)
90 return !!(d->opd_pre_thread.t_flags & SVC_STOPPED);
93 static void osp_statfs_timer_cb(unsigned long _d)
95 struct osp_device *d = (struct osp_device *) _d;
98 if (d->opd_pre != NULL && osp_precreate_running(d))
99 wake_up(&d->opd_pre_waitq);
103 * RPC interpret callback for OST_STATFS RPC
105 * An interpretation callback called by ptlrpc for OST_STATFS RPC when it is
106 * replied by the target. It's used to maintain statfs cache for the target.
107 * The function fills data from the reply if successful and schedules another
110 * \param[in] env LU environment provided by the caller
111 * \param[in] req RPC replied
112 * \param[in] aa callback data
113 * \param[in] rc RPC result
115 * \retval 0 on success
116 * \retval negative negated errno on error
118 static int osp_statfs_interpret(const struct lu_env *env,
119 struct ptlrpc_request *req,
120 union ptlrpc_async_args *aa, int rc)
122 struct obd_import *imp = req->rq_import;
123 struct obd_statfs *msfs;
124 struct osp_device *d;
128 aa = ptlrpc_req_async_args(req);
129 d = aa->pointer_arg[0];
135 msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
137 GOTO(out, rc = -EPROTO);
139 d->opd_statfs = *msfs;
141 osp_pre_update_status(d, rc);
143 /* schedule next update */
144 d->opd_statfs_fresh_till = cfs_time_shift(d->opd_statfs_maxage);
145 cfs_timer_arm(&d->opd_statfs_timer, d->opd_statfs_fresh_till);
146 d->opd_statfs_update_in_progress = 0;
148 CDEBUG(D_CACHE, "updated statfs %p\n", d);
152 /* couldn't update statfs, try again as soon as possible */
153 if (d->opd_pre != NULL && osp_precreate_running(d))
154 wake_up(&d->opd_pre_waitq);
156 if (req->rq_import_generation == imp->imp_generation)
157 CDEBUG(D_CACHE, "%s: couldn't update statfs: rc = %d\n",
158 d->opd_obd->obd_name, rc);
163 * Send OST_STATFS RPC
165 * Sends OST_STATFS RPC to refresh cached statfs data for the target.
166 * Also disables scheduled updates as times OSP may need to refresh
167 * statfs data before expiration. The function doesn't block, instead
168 * an interpretation callback osp_statfs_interpret() is used.
170 * \param[in] d OSP device
172 static int osp_statfs_update(struct osp_device *d)
174 struct ptlrpc_request *req;
175 struct obd_import *imp;
176 union ptlrpc_async_args *aa;
181 CDEBUG(D_CACHE, "going to update statfs\n");
183 imp = d->opd_obd->u.cli.cl_import;
186 req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
190 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
192 ptlrpc_request_free(req);
195 ptlrpc_request_set_replen(req);
196 req->rq_request_portal = OST_CREATE_PORTAL;
197 ptlrpc_at_set_req_timeout(req);
199 req->rq_interpret_reply = (ptlrpc_interpterer_t)osp_statfs_interpret;
200 aa = ptlrpc_req_async_args(req);
201 aa->pointer_arg[0] = d;
204 * no updates till reply
206 cfs_timer_disarm(&d->opd_statfs_timer);
207 d->opd_statfs_fresh_till = cfs_time_shift(obd_timeout * 1000);
208 d->opd_statfs_update_in_progress = 1;
210 ptlrpcd_add_req(req);
216 * Schedule an immediate update for statfs data
218 * If cached statfs data claim no free space, but OSP has got a request to
219 * destroy an object (so release some space probably), then we may need to
220 * refresh cached statfs data sooner than planned. The function checks there
221 * is no statfs update going and schedules immediate update if so.
222 * XXX: there might be a case where removed object(s) do not add free space (empty
223 * object). If the number of such deletions is high, then we can start to update
224 * statfs too often causing a RPC storm. some throttling is needed...
226 * \param[in] d OSP device where statfs data needs to be refreshed
228 void osp_statfs_need_now(struct osp_device *d)
230 if (!d->opd_statfs_update_in_progress) {
232 * if current status is -ENOSPC (lack of free space on OST)
233 * then we should poll OST immediately once object destroy
236 d->opd_statfs_fresh_till = cfs_time_shift(-1);
237 cfs_timer_disarm(&d->opd_statfs_timer);
238 wake_up(&d->opd_pre_waitq);
243 * Return number of precreated objects
245 * A simple helper to calculate the number of precreated objects on the device.
247 * \param[in] env LU environment provided by the caller
248 * \param[in] osp OSP device
250 * \retval the number of the precreated objects
252 static inline int osp_objs_precreated(const struct lu_env *env,
253 struct osp_device *osp)
255 return osp_fid_diff(&osp->opd_pre_last_created_fid,
256 &osp->opd_pre_used_fid);
260 * Check pool of precreated objects is nearly empty
262 * We should not wait till the pool of the precreated objects is exhausted,
263 * because then there will be a long period of OSP being unavailable for the
264 * new creations due to lenghty precreate RPC. Instead we ask for another
265 * precreation ahead and hopefully have it ready before the current pool is
266 * empty. Notice this function relies on an external locking.
268 * \param[in] env LU environment provided by the caller
269 * \param[in] d OSP device
271 * \retval 0 - current pool is good enough, 1 - time to precreate
273 static inline int osp_precreate_near_empty_nolock(const struct lu_env *env,
274 struct osp_device *d)
276 int window = osp_objs_precreated(env, d);
278 /* don't consider new precreation till OST is healty and
280 return ((window - d->opd_pre_reserved < d->opd_pre_grow_count / 2) &&
281 (d->opd_pre_status == 0));
285 * Check pool of precreated objects
287 * This is protected version of osp_precreate_near_empty_nolock(), check that
290 * \param[in] env LU environment provided by the caller
291 * \param[in] d OSP device
293 * \retval 0 - current pool is good enough, 1 - time to precreate
295 static inline int osp_precreate_near_empty(const struct lu_env *env,
296 struct osp_device *d)
300 /* XXX: do we really need locking here? */
301 spin_lock(&d->opd_pre_lock);
302 rc = osp_precreate_near_empty_nolock(env, d);
303 spin_unlock(&d->opd_pre_lock);
308 * Check given sequence is empty
310 * Returns a binary result whether the given sequence has some IDs left
311 * or not. Find the details in osp_fid_end_seq(). This is a lock protected
312 * version of that function.
314 * \param[in] env LU environment provided by the caller
315 * \param[in] osp OSP device
317 * \retval 0 - current sequence has no IDs, 1 - otherwise
319 static inline int osp_create_end_seq(const struct lu_env *env,
320 struct osp_device *osp)
322 struct lu_fid *fid = &osp->opd_pre_used_fid;
325 spin_lock(&osp->opd_pre_lock);
326 rc = osp_fid_end_seq(env, fid);
327 spin_unlock(&osp->opd_pre_lock);
332 * Write FID into into last_oid/last_seq file
334 * The function stores the sequence and the in-sequence id into two dedicated
335 * files. The sync argument can be used to request synchronous commit, so the
336 * function won't return until the updates are committed.
338 * \param[in] env LU environment provided by the caller
339 * \param[in] osp OSP device
340 * \param[in] fid fid where sequence/id is taken
341 * \param[in] sync update mode: 0 - asynchronously, 1 - synchronously
343 * \retval 0 on success
344 * \retval negative negated errno on error
346 int osp_write_last_oid_seq_files(struct lu_env *env, struct osp_device *osp,
347 struct lu_fid *fid, int sync)
349 struct osp_thread_info *oti = osp_env_info(env);
350 struct lu_buf *lb_oid = &oti->osi_lb;
351 struct lu_buf *lb_oseq = &oti->osi_lb2;
358 /* Note: through f_oid is only 32 bits, it will also write 64 bits
359 * for oid to keep compatibility with the previous version. */
360 lb_oid->lb_buf = &fid->f_oid;
361 lb_oid->lb_len = sizeof(u64);
362 oid_off = sizeof(u64) * osp->opd_index;
364 lb_oseq->lb_buf = &fid->f_seq;
365 lb_oseq->lb_len = sizeof(u64);
366 oseq_off = sizeof(u64) * osp->opd_index;
368 th = dt_trans_create(env, osp->opd_storage);
373 rc = dt_declare_record_write(env, osp->opd_last_used_oid_file,
374 lb_oid, oid_off, th);
378 rc = dt_declare_record_write(env, osp->opd_last_used_seq_file,
379 lb_oseq, oseq_off, th);
383 rc = dt_trans_start_local(env, osp->opd_storage, th);
387 rc = dt_record_write(env, osp->opd_last_used_oid_file, lb_oid,
390 CERROR("%s: can not write to last seq file: rc = %d\n",
391 osp->opd_obd->obd_name, rc);
394 rc = dt_record_write(env, osp->opd_last_used_seq_file, lb_oseq,
397 CERROR("%s: can not write to last seq file: rc = %d\n",
398 osp->opd_obd->obd_name, rc);
402 dt_trans_stop(env, osp->opd_storage, th);
407 * Switch to another sequence
409 * When a current sequence has no available IDs left, OSP has to switch to
410 * another new sequence. OSP requests it using the regular FLDB protocol
411 * and stores synchronously before that is used in precreated. This is needed
412 * to basically have the sequences referenced (not orphaned), otherwise it's
413 * possible that OST has some objects precreated and the clients have data
414 * written to it, but after MDT failover nobody refers those objects and OSP
415 * has no idea that the sequence need cleanup to be done.
416 * While this is very expensive operation, it's supposed to happen very very
417 * infrequently because sequence has 2^32 or 2^48 objects (depending on type)
419 * \param[in] env LU environment provided by the caller
420 * \param[in] osp OSP device
422 * \retval 0 on success
423 * \retval negative negated errno on error
425 static int osp_precreate_rollover_new_seq(struct lu_env *env,
426 struct osp_device *osp)
428 struct lu_fid *fid = &osp_env_info(env)->osi_fid;
429 struct lu_fid *last_fid = &osp->opd_last_used_fid;
433 rc = seq_client_get_seq(env, osp->opd_obd->u.cli.cl_seq, &fid->f_seq);
435 CERROR("%s: alloc fid error: rc = %d\n",
436 osp->opd_obd->obd_name, rc);
442 LASSERTF(fid_seq(fid) != fid_seq(last_fid),
443 "fid "DFID", last_fid "DFID"\n", PFID(fid),
446 rc = osp_write_last_oid_seq_files(env, osp, fid, 1);
448 CERROR("%s: Can not update oid/seq file: rc = %d\n",
449 osp->opd_obd->obd_name, rc);
453 LCONSOLE_INFO("%s: update sequence from "LPX64" to "LPX64"\n",
454 osp->opd_obd->obd_name, fid_seq(last_fid),
456 /* Update last_xxx to the new seq */
457 spin_lock(&osp->opd_pre_lock);
458 osp->opd_last_used_fid = *fid;
459 osp->opd_gap_start_fid = *fid;
460 osp->opd_pre_used_fid = *fid;
461 osp->opd_pre_last_created_fid = *fid;
462 spin_unlock(&osp->opd_pre_lock);
468 * Find IDs available in current sequence
470 * The function calculates the highest possible ID and the number of IDs
471 * available in the current sequence OSP is using. The number is limited
472 * artifically by the caller (grow param) and the number of IDs available
473 * in the sequence by nature. The function doesn't require an external
476 * \param[in] env LU environment provided by the caller
477 * \param[in] osp OSP device
478 * \param[in] fid FID the caller wants to start with
479 * \param[in] grow how many the caller wants
480 * \param[out] fid the highest calculated FID
481 * \param[out] grow the number of available IDs calculated
483 * \retval 0 on success, 1 - the sequence is empty
485 static int osp_precreate_fids(const struct lu_env *env, struct osp_device *osp,
486 struct lu_fid *fid, int *grow)
488 struct osp_thread_info *osi = osp_env_info(env);
492 if (fid_is_idif(fid)) {
493 struct lu_fid *last_fid;
494 struct ost_id *oi = &osi->osi_oi;
496 spin_lock(&osp->opd_pre_lock);
497 last_fid = &osp->opd_pre_last_created_fid;
498 fid_to_ostid(last_fid, oi);
499 end = min(ostid_id(oi) + *grow, IDIF_MAX_OID);
500 *grow = end - ostid_id(oi);
501 ostid_set_id(oi, ostid_id(oi) + *grow);
502 spin_unlock(&osp->opd_pre_lock);
507 ostid_to_fid(fid, oi, osp->opd_index);
511 spin_lock(&osp->opd_pre_lock);
512 *fid = osp->opd_pre_last_created_fid;
514 end = min((end + *grow), (__u64)LUSTRE_DATA_SEQ_MAX_WIDTH);
515 *grow = end - fid->f_oid;
516 fid->f_oid += end - fid->f_oid;
517 spin_unlock(&osp->opd_pre_lock);
519 CDEBUG(D_INFO, "Expect %d, actual %d ["DFID" -- "DFID"]\n",
520 *grow, i, PFID(fid), PFID(&osp->opd_pre_last_created_fid));
522 return *grow > 0 ? 0 : 1;
526 * Prepare and send precreate RPC
528 * The function finds how many objects should be precreated. Then allocates,
529 * prepares and schedules precreate RPC synchronously. Upon reply the function
530 * wake ups the threads waiting for the new objects on this target. If the
531 * target wasn't able to create all the objects requested, then the next
532 * precreate will be asking less objects (i.e. slow precreate down).
534 * \param[in] env LU environment provided by the caller
535 * \param[in] d OSP device
537 * \retval 0 on success
538 * \retval negative negated errno on error
540 static int osp_precreate_send(const struct lu_env *env, struct osp_device *d)
542 struct osp_thread_info *oti = osp_env_info(env);
543 struct ptlrpc_request *req;
544 struct obd_import *imp;
545 struct ost_body *body;
547 struct lu_fid *fid = &oti->osi_fid;
550 /* don't precreate new objects till OST healthy and has free space */
551 if (unlikely(d->opd_pre_status)) {
552 CDEBUG(D_INFO, "%s: don't send new precreate: rc = %d\n",
553 d->opd_obd->obd_name, d->opd_pre_status);
558 * if not connection/initialization is compeleted, ignore
560 imp = d->opd_obd->u.cli.cl_import;
563 req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
566 req->rq_request_portal = OST_CREATE_PORTAL;
567 /* we should not resend create request - anyway we will have delorphan
568 * and kill these objects */
569 req->rq_no_delay = req->rq_no_resend = 1;
571 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
573 ptlrpc_request_free(req);
577 spin_lock(&d->opd_pre_lock);
578 if (d->opd_pre_grow_count > d->opd_pre_max_grow_count / 2)
579 d->opd_pre_grow_count = d->opd_pre_max_grow_count / 2;
580 grow = d->opd_pre_grow_count;
581 spin_unlock(&d->opd_pre_lock);
583 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
586 *fid = d->opd_pre_last_created_fid;
587 rc = osp_precreate_fids(env, d, fid, &grow);
589 /* Current seq has been used up*/
590 if (!osp_is_fid_client(d)) {
591 osp_pre_update_status(d, -ENOSPC);
594 wake_up(&d->opd_pre_waitq);
598 if (!osp_is_fid_client(d)) {
599 /* Non-FID client will always send seq 0 because of
601 LASSERTF(fid_is_idif(fid), "Invalid fid "DFID"\n", PFID(fid));
605 fid_to_ostid(fid, &body->oa.o_oi);
606 body->oa.o_valid = OBD_MD_FLGROUP;
608 ptlrpc_request_set_replen(req);
610 rc = ptlrpc_queue_wait(req);
612 CERROR("%s: can't precreate: rc = %d\n", d->opd_obd->obd_name,
616 LASSERT(req->rq_transno == 0);
618 body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
620 GOTO(out_req, rc = -EPROTO);
622 ostid_to_fid(fid, &body->oa.o_oi, d->opd_index);
623 if (osp_fid_diff(fid, &d->opd_pre_used_fid) <= 0) {
624 CERROR("%s: precreate fid "DFID" < local used fid "DFID
625 ": rc = %d\n", d->opd_obd->obd_name,
626 PFID(fid), PFID(&d->opd_pre_used_fid), -ESTALE);
627 GOTO(out_req, rc = -ESTALE);
630 diff = osp_fid_diff(fid, &d->opd_pre_last_created_fid);
632 spin_lock(&d->opd_pre_lock);
634 /* the OST has not managed to create all the
635 * objects we asked for */
636 d->opd_pre_grow_count = max(diff, OST_MIN_PRECREATE);
637 d->opd_pre_grow_slow = 1;
639 /* the OST is able to keep up with the work,
640 * we could consider increasing grow_count
641 * next time if needed */
642 d->opd_pre_grow_slow = 0;
645 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
646 fid_to_ostid(fid, &body->oa.o_oi);
648 d->opd_pre_last_created_fid = *fid;
649 spin_unlock(&d->opd_pre_lock);
651 CDEBUG(D_HA, "%s: current precreated pool: "DFID"-"DFID"\n",
652 d->opd_obd->obd_name, PFID(&d->opd_pre_used_fid),
653 PFID(&d->opd_pre_last_created_fid));
655 /* now we can wakeup all users awaiting for objects */
656 osp_pre_update_status(d, rc);
657 wake_up(&d->opd_pre_user_waitq);
659 ptlrpc_req_finished(req);
664 * Get last precreated object from target (OST)
666 * Sends synchronous RPC to the target (OST) to learn the last precreated
667 * object. This later is used to remove all unused objects (cleanup orphan
668 * procedure). Also, the next object after one we got will be used as a
669 * starting point for the new precreates.
671 * \param[in] env LU environment provided by the caller
672 * \param[in] d OSP device
674 * \retval 0 on success
675 * \retval negative negated errno on error
677 static int osp_get_lastfid_from_ost(const struct lu_env *env,
678 struct osp_device *d)
680 struct ptlrpc_request *req = NULL;
681 struct obd_import *imp;
682 struct lu_fid *last_fid;
687 imp = d->opd_obd->u.cli.cl_import;
690 req = ptlrpc_request_alloc(imp, &RQF_OST_GET_INFO_LAST_FID);
694 req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY, RCL_CLIENT,
695 sizeof(KEY_LAST_FID));
697 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
699 ptlrpc_request_free(req);
703 tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
704 memcpy(tmp, KEY_LAST_FID, sizeof(KEY_LAST_FID));
706 req->rq_no_delay = req->rq_no_resend = 1;
707 last_fid = req_capsule_client_get(&req->rq_pill, &RMF_FID);
708 fid_cpu_to_le(last_fid, &d->opd_last_used_fid);
710 ptlrpc_request_set_replen(req);
712 rc = ptlrpc_queue_wait(req);
714 /* bad-bad OST.. let sysadm sort this out */
715 if (rc == -ENOTSUPP) {
716 CERROR("%s: server does not support FID: rc = %d\n",
717 d->opd_obd->obd_name, -ENOTSUPP);
719 ptlrpc_set_import_active(imp, 0);
723 last_fid = req_capsule_server_get(&req->rq_pill, &RMF_FID);
724 if (last_fid == NULL) {
725 CERROR("%s: Got last_fid failed.\n", d->opd_obd->obd_name);
726 GOTO(out, rc = -EPROTO);
729 if (!fid_is_sane(last_fid)) {
730 CERROR("%s: Got insane last_fid "DFID"\n",
731 d->opd_obd->obd_name, PFID(last_fid));
732 GOTO(out, rc = -EPROTO);
735 /* Only update the last used fid, if the OST has objects for
736 * this sequence, i.e. fid_oid > 0 */
737 if (fid_oid(last_fid) > 0)
738 d->opd_last_used_fid = *last_fid;
740 CDEBUG(D_HA, "%s: Got last_fid "DFID"\n", d->opd_obd->obd_name,
744 ptlrpc_req_finished(req);
749 * Cleanup orphans on OST
751 * This function is called in a contex of a dedicated thread handling
752 * all the precreation suff. The function waits till local recovery
753 * is complete, then identify all the unreferenced objects (orphans)
754 * using the highest ID referenced by a local and the highest object
755 * precreated by the target. The found range is a subject to removal
756 * using specially flagged RPC. During this process OSP is marked
757 * unavailable for new objects.
759 * \param[in] env LU environment provided by the caller
760 * \param[in] d OSP device
762 * \retval 0 on success
763 * \retval negative negated errno on error
765 static int osp_precreate_cleanup_orphans(struct lu_env *env,
766 struct osp_device *d)
768 struct osp_thread_info *osi = osp_env_info(env);
769 struct lu_fid *last_fid = &osi->osi_fid;
770 struct ptlrpc_request *req = NULL;
771 struct obd_import *imp;
772 struct ost_body *body;
773 struct l_wait_info lwi = { 0 };
774 int update_status = 0;
781 * wait for local recovery to finish, so we can cleanup orphans
782 * orphans are all objects since "last used" (assigned), but
783 * there might be objects reserved and in some cases they won't
784 * be used. we can't cleanup them till we're sure they won't be
785 * used. also can't we allow new reservations because they may
786 * end up getting orphans being cleaned up below. so we block
787 * new reservations and wait till all reserved objects either
790 spin_lock(&d->opd_pre_lock);
791 d->opd_pre_recovering = 1;
792 spin_unlock(&d->opd_pre_lock);
794 * The locking above makes sure the opd_pre_reserved check below will
795 * catch all osp_precreate_reserve() calls who find
796 * "!opd_pre_recovering".
798 l_wait_event(d->opd_pre_waitq,
799 (!d->opd_pre_reserved && d->opd_recovery_completed) ||
800 !osp_precreate_running(d) || d->opd_got_disconnected,
802 if (!osp_precreate_running(d) || d->opd_got_disconnected)
803 GOTO(out, rc = -EAGAIN);
805 CDEBUG(D_HA, "%s: going to cleanup orphans since "DFID"\n",
806 d->opd_obd->obd_name, PFID(&d->opd_last_used_fid));
808 *last_fid = d->opd_last_used_fid;
809 /* The OSP should already get the valid seq now */
810 LASSERT(!fid_is_zero(last_fid));
811 if (fid_oid(&d->opd_last_used_fid) < 2) {
812 /* lastfid looks strange... ask OST */
813 rc = osp_get_lastfid_from_ost(env, d);
818 imp = d->opd_obd->u.cli.cl_import;
821 req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
823 GOTO(out, rc = -ENOMEM);
825 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
827 ptlrpc_request_free(req);
832 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
834 GOTO(out, rc = -EPROTO);
836 body->oa.o_flags = OBD_FL_DELORPHAN;
837 body->oa.o_valid = OBD_MD_FLFLAGS | OBD_MD_FLGROUP;
839 fid_to_ostid(&d->opd_last_used_fid, &body->oa.o_oi);
841 ptlrpc_request_set_replen(req);
843 /* Don't resend the delorphan req */
844 req->rq_no_resend = req->rq_no_delay = 1;
846 rc = ptlrpc_queue_wait(req);
852 body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
854 GOTO(out, rc = -EPROTO);
857 * OST provides us with id new pool starts from in body->oa.o_id
859 ostid_to_fid(last_fid, &body->oa.o_oi, d->opd_index);
861 spin_lock(&d->opd_pre_lock);
862 diff = osp_fid_diff(&d->opd_last_used_fid, last_fid);
864 d->opd_pre_grow_count = OST_MIN_PRECREATE + diff;
865 d->opd_pre_last_created_fid = d->opd_last_used_fid;
867 d->opd_pre_grow_count = OST_MIN_PRECREATE;
868 d->opd_pre_last_created_fid = *last_fid;
871 * This empties the pre-creation pool and effectively blocks any new
874 LASSERT(fid_oid(&d->opd_pre_last_created_fid) <=
875 LUSTRE_DATA_SEQ_MAX_WIDTH);
876 d->opd_pre_used_fid = d->opd_pre_last_created_fid;
877 d->opd_pre_grow_slow = 0;
878 spin_unlock(&d->opd_pre_lock);
880 CDEBUG(D_HA, "%s: Got last_id "DFID" from OST, last_created "DFID
881 "last_used is "DFID"\n", d->opd_obd->obd_name, PFID(last_fid),
882 PFID(&d->opd_pre_last_created_fid), PFID(&d->opd_last_used_fid));
885 ptlrpc_req_finished(req);
887 spin_lock(&d->opd_pre_lock);
888 d->opd_pre_recovering = 0;
889 spin_unlock(&d->opd_pre_lock);
892 * If rc is zero, the pre-creation window should have been emptied.
893 * Since waking up the herd would be useless without pre-created
894 * objects, we defer the signal to osp_precreate_send() in that case.
898 CERROR("%s: cannot cleanup orphans: rc = %d\n",
899 d->opd_obd->obd_name, rc);
900 /* we can't proceed from here, OST seem to
901 * be in a bad shape, better to wait for
902 * a new instance of the server and repeat
903 * from the beginning. notify possible waiters
904 * this OSP isn't quite functional yet */
905 osp_pre_update_status(d, rc);
907 wake_up(&d->opd_pre_user_waitq);
915 * Update precreate status using statfs data
917 * The function decides whether this OSP should be used for new objects.
918 * IOW, whether this OST is used up or has some free space. Cached statfs
919 * data is used to make this decision. If the latest result of statfs
920 * request (rc argument) is not success, then just mark OSP unavailable
923 * Add a bit of hysteresis so this flag isn't continually flapping,
924 * and ensure that new files don't get extremely fragmented due to
925 * only a small amount of available space in the filesystem.
926 * We want to set the NOSPC flag when there is less than ~0.1% free
927 * and clear it when there is at least ~0.2% free space, so:
928 * avail < ~0.1% max max = avail + used
929 * 1025 * avail < avail + used used = blocks - free
930 * 1024 * avail < used
931 * 1024 * avail < blocks - free
932 * avail < ((blocks - free) >> 10)
934 * On very large disk, say 16TB 0.1% will be 16 GB. We don't want to
935 * lose that amount of space so in those cases we report no space left
936 * if their is less than 1 GB left.
937 * the function updates current precreation status used: functional or not
939 * \param[in] d OSP device
940 * \param[in] rc new precreate status for device \a d
942 * \retval 0 on success
943 * \retval negative negated errno on error
945 void osp_pre_update_status(struct osp_device *d, int rc)
947 struct obd_statfs *msfs = &d->opd_statfs;
948 int old = d->opd_pre_status;
951 d->opd_pre_status = rc;
955 if (likely(msfs->os_type)) {
956 used = min_t(__u64, (msfs->os_blocks - msfs->os_bfree) >> 10,
958 if ((msfs->os_ffree < 32) || (msfs->os_bavail < used)) {
959 d->opd_pre_status = -ENOSPC;
961 CDEBUG(D_INFO, "%s: status: "LPU64" blocks, "
962 LPU64" free, "LPU64" used, "LPU64" "
963 "avail -> %d: rc = %d\n",
964 d->opd_obd->obd_name, msfs->os_blocks,
965 msfs->os_bfree, used, msfs->os_bavail,
966 d->opd_pre_status, rc);
968 "non-commited changes: %lu, in progress: %u\n",
969 d->opd_syn_changes, d->opd_syn_rpc_in_progress);
970 } else if (old == -ENOSPC) {
971 d->opd_pre_status = 0;
972 spin_lock(&d->opd_pre_lock);
973 d->opd_pre_grow_slow = 0;
974 d->opd_pre_grow_count = OST_MIN_PRECREATE;
975 spin_unlock(&d->opd_pre_lock);
976 wake_up(&d->opd_pre_waitq);
977 CDEBUG(D_INFO, "%s: no space: "LPU64" blocks, "LPU64
978 " free, "LPU64" used, "LPU64" avail -> %d: "
979 "rc = %d\n", d->opd_obd->obd_name,
980 msfs->os_blocks, msfs->os_bfree, used,
981 msfs->os_bavail, d->opd_pre_status, rc);
986 wake_up(&d->opd_pre_user_waitq);
990 * Initialize FID for precreation
992 * For a just created new target, a new sequence should be taken.
993 * The function checks there is no IDIF in use (if the target was
994 * added with the older version of Lustre), then requests a new
995 * sequence from FLDB using the regular protocol. Then this new
996 * sequence is stored on a persisten storage synchronously to prevent
997 * possible object leakage (for the detail see the description for
998 * osp_precreate_rollover_new_seq()).
1000 * \param[in] osp OSP device
1002 * \retval 0 on success
1003 * \retval negative negated errno on error
1005 int osp_init_pre_fid(struct osp_device *osp)
1008 struct osp_thread_info *osi;
1009 struct lu_client_seq *cli_seq;
1010 struct lu_fid *last_fid;
1014 LASSERT(osp->opd_pre != NULL);
1016 /* Return if last_used fid has been initialized */
1017 if (!fid_is_zero(&osp->opd_last_used_fid))
1020 rc = lu_env_init(&env, osp->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
1022 CERROR("%s: init env error: rc = %d\n",
1023 osp->opd_obd->obd_name, rc);
1027 osi = osp_env_info(&env);
1028 last_fid = &osi->osi_fid;
1030 /* For a freshed fs, it will allocate a new sequence first */
1031 if (osp_is_fid_client(osp) && osp->opd_group != 0) {
1032 cli_seq = osp->opd_obd->u.cli.cl_seq;
1033 rc = seq_client_get_seq(&env, cli_seq, &last_fid->f_seq);
1035 CERROR("%s: alloc fid error: rc = %d\n",
1036 osp->opd_obd->obd_name, rc);
1040 last_fid->f_seq = fid_idif_seq(0, osp->opd_index);
1042 last_fid->f_oid = 1;
1043 last_fid->f_ver = 0;
1045 spin_lock(&osp->opd_pre_lock);
1046 osp->opd_last_used_fid = *last_fid;
1047 osp->opd_pre_used_fid = *last_fid;
1048 osp->opd_pre_last_created_fid = *last_fid;
1049 spin_unlock(&osp->opd_pre_lock);
1050 rc = osp_write_last_oid_seq_files(&env, osp, last_fid, 1);
1052 CERROR("%s: write fid error: rc = %d\n",
1053 osp->opd_obd->obd_name, rc);
1062 * The core of precreate functionality
1064 * The function implements the main precreation loop. Basically it
1065 * involves connecting to the target, precerate FID initialization,
1066 * identifying and removing orphans, then serving precreation. As
1067 * part of the latter, the thread is responsible for statfs data
1068 * updates. The precreation is mostly driven by another threads
1069 * asking for new OST objects - those askers wake the thread when
1070 * the number of precreated objects reach low watermark.
1071 * After a disconnect, the sequence above repeats. This is keep going
1072 * until the thread is requested to stop.
1074 * \param[in] _arg private data the thread (OSP device to handle)
1076 * \retval 0 on success
1077 * \retval negative negated errno on error
1079 static int osp_precreate_thread(void *_arg)
1081 struct osp_device *d = _arg;
1082 struct ptlrpc_thread *thread = &d->opd_pre_thread;
1083 struct l_wait_info lwi = { 0 };
1089 rc = lu_env_init(&env, d->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
1091 CERROR("%s: init env error: rc = %d\n", d->opd_obd->obd_name,
1096 spin_lock(&d->opd_pre_lock);
1097 thread->t_flags = SVC_RUNNING;
1098 spin_unlock(&d->opd_pre_lock);
1099 wake_up(&thread->t_ctl_waitq);
1101 while (osp_precreate_running(d)) {
1103 * need to be connected to OST
1105 while (osp_precreate_running(d)) {
1106 l_wait_event(d->opd_pre_waitq,
1107 !osp_precreate_running(d) ||
1108 d->opd_new_connection,
1111 if (!d->opd_new_connection)
1114 d->opd_new_connection = 0;
1115 d->opd_got_disconnected = 0;
1119 if (!osp_precreate_running(d))
1122 LASSERT(d->opd_obd->u.cli.cl_seq != NULL);
1123 /* Sigh, fid client is not ready yet */
1124 if (d->opd_obd->u.cli.cl_seq->lcs_exp == NULL)
1127 /* Init fid for osp_precreate if necessary */
1128 rc = osp_init_pre_fid(d);
1130 class_export_put(d->opd_exp);
1131 d->opd_obd->u.cli.cl_seq->lcs_exp = NULL;
1132 CERROR("%s: init pre fid error: rc = %d\n",
1133 d->opd_obd->obd_name, rc);
1137 osp_statfs_update(d);
1140 * Clean up orphans or recreate missing objects.
1142 rc = osp_precreate_cleanup_orphans(&env, d);
1146 * connected, can handle precreates now
1148 while (osp_precreate_running(d)) {
1149 l_wait_event(d->opd_pre_waitq,
1150 !osp_precreate_running(d) ||
1151 osp_precreate_near_empty(&env, d) ||
1152 osp_statfs_need_update(d) ||
1153 d->opd_got_disconnected, &lwi);
1155 if (!osp_precreate_running(d))
1158 /* something happened to the connection
1159 * have to start from the beginning */
1160 if (d->opd_got_disconnected)
1163 if (osp_statfs_need_update(d))
1164 osp_statfs_update(d);
1166 /* To avoid handling different seq in precreate/orphan
1167 * cleanup, it will hold precreate until current seq is
1169 if (unlikely(osp_precreate_end_seq(&env, d) &&
1170 !osp_create_end_seq(&env, d)))
1173 if (unlikely(osp_precreate_end_seq(&env, d) &&
1174 osp_create_end_seq(&env, d))) {
1175 LCONSOLE_INFO("%s:"LPX64" is used up."
1176 " Update to new seq\n",
1177 d->opd_obd->obd_name,
1178 fid_seq(&d->opd_pre_last_created_fid));
1179 rc = osp_precreate_rollover_new_seq(&env, d);
1184 if (osp_precreate_near_empty(&env, d)) {
1185 rc = osp_precreate_send(&env, d);
1186 /* osp_precreate_send() sets opd_pre_status
1187 * in case of error, that prevent the using of
1189 if (rc < 0 && rc != -ENOSPC &&
1190 rc != -ETIMEDOUT && rc != -ENOTCONN)
1191 CERROR("%s: cannot precreate objects:"
1193 d->opd_obd->obd_name, rc);
1198 thread->t_flags = SVC_STOPPED;
1200 wake_up(&thread->t_ctl_waitq);
1206 * Check when to stop to wait for precreate objects.
1208 * The caller wanting a new OST object can't wait undefinitely. The
1209 * function checks for few conditions including available new OST
1210 * objects, disconnected OST, lack of space with no pending destroys,
1211 * etc. IOW, it checks whether the current OSP state is good to keep
1212 * waiting or it's better to give up.
1214 * \param[in] env LU environment provided by the caller
1215 * \param[in] d OSP device
1217 * \retval 0 - keep waiting, 1 - no luck
1219 static int osp_precreate_ready_condition(const struct lu_env *env,
1220 struct osp_device *d)
1222 if (d->opd_pre_recovering)
1225 /* ready if got enough precreated objects */
1226 /* we need to wait for others (opd_pre_reserved) and our object (+1) */
1227 if (d->opd_pre_reserved + 1 < osp_objs_precreated(env, d))
1230 /* ready if OST reported no space and no destroys in progress */
1231 if (d->opd_syn_changes + d->opd_syn_rpc_in_progress == 0 &&
1232 d->opd_pre_status == -ENOSPC)
1235 /* Bail out I/O fails to OST */
1236 if (d->opd_pre_status != 0 &&
1237 d->opd_pre_status != -EAGAIN &&
1238 d->opd_pre_status != -ENODEV &&
1239 d->opd_pre_status != -ENOSPC) {
1241 if (d->opd_pre_status != -EIO)
1242 CERROR("%s: precreate failed opd_pre_status %d\n",
1243 d->opd_obd->obd_name, d->opd_pre_status);
1250 static int osp_precreate_timeout_condition(void *data)
1252 struct osp_device *d = data;
1254 CDEBUG(D_HA, "%s: slow creates, last="DFID", next="DFID", "
1255 "reserved="LPU64", syn_changes=%lu, "
1256 "syn_rpc_in_progress=%d, status=%d\n",
1257 d->opd_obd->obd_name, PFID(&d->opd_pre_last_created_fid),
1258 PFID(&d->opd_pre_used_fid), d->opd_pre_reserved,
1259 d->opd_syn_changes, d->opd_syn_rpc_in_progress,
1266 * Reserve object in precreate pool
1268 * When the caller wants to create a new object on this target (target
1269 * represented by the given OSP), it should declare this intention using
1270 * a regular ->dt_declare_create() OSD API method. Then OSP will be trying
1271 * to reserve an object in the existing precreated pool or wait up to
1272 * obd_timeout for the available object to appear in the pool (a dedicated
1273 * thread will be doing real precreation in background). The object can be
1274 * consumed later with osp_precreate_get_fid() or be released with call to
1275 * lu_object_put(). Notice the function doesn't reserve a specific ID, just
1276 * some ID. The actual ID assignment happen in osp_precreate_get_fid().
1277 * If the space on the target is short and there is a pending object destroy,
1278 * then the function forces local commit to speedup space release (see
1279 * osp_sync.c for the details).
1281 * \param[in] env LU environment provided by the caller
1282 * \param[in] d OSP device
1284 * \retval 0 on success
1285 * \retval -ENOSPC when no space on OST
1286 * \retval -EAGAIN try later, slow precreation in progress
1287 * \retval -EIO when no access to OST
1289 int osp_precreate_reserve(const struct lu_env *env, struct osp_device *d)
1291 struct l_wait_info lwi;
1292 cfs_time_t expire = cfs_time_shift(obd_timeout);
1297 LASSERTF(osp_objs_precreated(env, d) >= 0, "Last created FID "DFID
1298 "Next FID "DFID"\n", PFID(&d->opd_pre_last_created_fid),
1299 PFID(&d->opd_pre_used_fid));
1303 * - preallocation is done
1304 * - no free space expected soon
1305 * - can't connect to OST for too long (obd_timeout)
1306 * - OST can allocate fid sequence.
1308 while ((rc = d->opd_pre_status) == 0 || rc == -ENOSPC ||
1309 rc == -ENODEV || rc == -EAGAIN || rc == -ENOTCONN) {
1312 * increase number of precreations
1314 precreated = osp_objs_precreated(env, d);
1315 if (d->opd_pre_grow_count < d->opd_pre_max_grow_count &&
1316 d->opd_pre_grow_slow == 0 &&
1317 precreated <= (d->opd_pre_grow_count / 4 + 1)) {
1318 spin_lock(&d->opd_pre_lock);
1319 d->opd_pre_grow_slow = 1;
1320 d->opd_pre_grow_count *= 2;
1321 spin_unlock(&d->opd_pre_lock);
1324 spin_lock(&d->opd_pre_lock);
1325 precreated = osp_objs_precreated(env, d);
1326 if (precreated > d->opd_pre_reserved &&
1327 !d->opd_pre_recovering) {
1328 d->opd_pre_reserved++;
1329 spin_unlock(&d->opd_pre_lock);
1332 /* XXX: don't wake up if precreation is in progress */
1333 if (osp_precreate_near_empty_nolock(env, d) &&
1334 !osp_precreate_end_seq_nolock(env, d))
1335 wake_up(&d->opd_pre_waitq);
1339 spin_unlock(&d->opd_pre_lock);
1342 * all precreated objects have been used and no-space
1343 * status leave us no chance to succeed very soon
1344 * but if there is destroy in progress, then we should
1345 * wait till that is done - some space might be released
1347 if (unlikely(rc == -ENOSPC)) {
1348 if (d->opd_syn_changes) {
1349 /* force local commit to release space */
1350 dt_commit_async(env, d->opd_storage);
1352 if (d->opd_syn_rpc_in_progress) {
1353 /* just wait till destroys are done */
1354 /* see l_wait_even() few lines below */
1356 if (d->opd_syn_changes +
1357 d->opd_syn_rpc_in_progress == 0) {
1358 /* no hope for free space */
1363 /* XXX: don't wake up if precreation is in progress */
1364 wake_up(&d->opd_pre_waitq);
1366 lwi = LWI_TIMEOUT(expire - cfs_time_current(),
1367 osp_precreate_timeout_condition, d);
1368 if (cfs_time_aftereq(cfs_time_current(), expire)) {
1373 l_wait_event(d->opd_pre_user_waitq,
1374 osp_precreate_ready_condition(env, d), &lwi);
1381 * Get a FID from precreation pool
1383 * The function is a companion for osp_precreate_reserve() - it assigns
1384 * a specific FID from the precreate. The function should be called only
1385 * if the call to osp_precreate_reserve() was successful. The function
1386 * updates a local storage to remember the highest object ID referenced
1387 * by the node in the given sequence.
1389 * A very importan details: this is supposed to be called once the
1390 * transaction is started, so on-disk update will be atomic with the
1391 * data (like LOVEA) refering this object. Then the object won't be leaked:
1392 * either it's referenced by the committed transaction or it's a subject
1393 * to the orphan cleanup procedure.
1395 * \param[in] env LU environment provided by the caller
1396 * \param[in] d OSP device
1397 * \param[out] fid generated FID
1399 * \retval 0 on success
1400 * \retval negative negated errno on error
1402 int osp_precreate_get_fid(const struct lu_env *env, struct osp_device *d,
1405 /* grab next id from the pool */
1406 spin_lock(&d->opd_pre_lock);
1408 LASSERTF(osp_fid_diff(&d->opd_pre_used_fid,
1409 &d->opd_pre_last_created_fid) < 0,
1410 "next fid "DFID" last created fid "DFID"\n",
1411 PFID(&d->opd_pre_used_fid),
1412 PFID(&d->opd_pre_last_created_fid));
1414 d->opd_pre_used_fid.f_oid++;
1415 memcpy(fid, &d->opd_pre_used_fid, sizeof(*fid));
1416 d->opd_pre_reserved--;
1418 * last_used_id must be changed along with getting new id otherwise
1419 * we might miscalculate gap causing object loss or leak
1421 osp_update_last_fid(d, fid);
1422 spin_unlock(&d->opd_pre_lock);
1425 * probably main thread suspended orphan cleanup till
1426 * all reservations are released, see comment in
1427 * osp_precreate_thread() just before orphan cleanup
1429 if (unlikely(d->opd_pre_reserved == 0 && d->opd_pre_status))
1430 wake_up(&d->opd_pre_waitq);
1436 * Set size regular attribute on an object
1438 * When a striping is created late, it's possible that size is already
1439 * initialized on the file. Then the new striping should inherit size
1440 * from the file. The function sets size on the object using the regular
1441 * protocol (OST_PUNCH).
1442 * XXX: should be re-implemented using OUT ?
1444 * \param[in] env LU environment provided by the caller
1445 * \param[in] dt object
1446 * \param[in] size size to set.
1448 * \retval 0 on success
1449 * \retval negative negated errno on error
1451 int osp_object_truncate(const struct lu_env *env, struct dt_object *dt,
1454 struct osp_device *d = lu2osp_dev(dt->do_lu.lo_dev);
1455 struct ptlrpc_request *req = NULL;
1456 struct obd_import *imp;
1457 struct ost_body *body;
1458 struct obdo *oa = NULL;
1463 imp = d->opd_obd->u.cli.cl_import;
1466 req = ptlrpc_request_alloc(imp, &RQF_OST_PUNCH);
1470 /* XXX: capa support? */
1471 /* osc_set_capa_size(req, &RMF_CAPA1, capa); */
1472 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
1474 ptlrpc_request_free(req);
1479 * XXX: decide how do we do here with resend
1480 * if we don't resend, then client may see wrong file size
1481 * if we do resend, then MDS thread can get stuck for quite long
1483 req->rq_no_resend = req->rq_no_delay = 1;
1485 req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1486 ptlrpc_at_set_req_timeout(req);
1490 GOTO(out, rc = -ENOMEM);
1492 rc = fid_to_ostid(lu_object_fid(&dt->do_lu), &oa->o_oi);
1495 oa->o_blocks = OBD_OBJECT_EOF;
1496 oa->o_valid = OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
1497 OBD_MD_FLID | OBD_MD_FLGROUP;
1499 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
1501 lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
1503 /* XXX: capa support? */
1504 /* osc_pack_capa(req, body, capa); */
1506 ptlrpc_request_set_replen(req);
1508 rc = ptlrpc_queue_wait(req);
1510 CERROR("can't punch object: %d\n", rc);
1512 ptlrpc_req_finished(req);
1519 * Initialize precreation functionality of OSP
1521 * Prepares all the internal structures and starts the precreate thread
1523 * \param[in] d OSP device
1525 * \retval 0 on success
1526 * \retval negative negated errno on error
1528 int osp_init_precreate(struct osp_device *d)
1530 struct l_wait_info lwi = { 0 };
1531 struct task_struct *task;
1535 OBD_ALLOC_PTR(d->opd_pre);
1536 if (d->opd_pre == NULL)
1539 /* initially precreation isn't ready */
1540 d->opd_pre_status = -EAGAIN;
1541 fid_zero(&d->opd_pre_used_fid);
1542 d->opd_pre_used_fid.f_oid = 1;
1543 fid_zero(&d->opd_pre_last_created_fid);
1544 d->opd_pre_last_created_fid.f_oid = 1;
1545 d->opd_pre_reserved = 0;
1546 d->opd_got_disconnected = 1;
1547 d->opd_pre_grow_slow = 0;
1548 d->opd_pre_grow_count = OST_MIN_PRECREATE;
1549 d->opd_pre_min_grow_count = OST_MIN_PRECREATE;
1550 d->opd_pre_max_grow_count = OST_MAX_PRECREATE;
1552 spin_lock_init(&d->opd_pre_lock);
1553 init_waitqueue_head(&d->opd_pre_waitq);
1554 init_waitqueue_head(&d->opd_pre_user_waitq);
1555 init_waitqueue_head(&d->opd_pre_thread.t_ctl_waitq);
1558 * Initialize statfs-related things
1560 d->opd_statfs_maxage = 5; /* default update interval */
1561 d->opd_statfs_fresh_till = cfs_time_shift(-1000);
1562 CDEBUG(D_OTHER, "current %llu, fresh till %llu\n",
1563 (unsigned long long)cfs_time_current(),
1564 (unsigned long long)d->opd_statfs_fresh_till);
1565 cfs_timer_init(&d->opd_statfs_timer, osp_statfs_timer_cb, d);
1568 * start thread handling precreation and statfs updates
1570 task = kthread_run(osp_precreate_thread, d,
1571 "osp-pre-%u-%u", d->opd_index, d->opd_group);
1573 CERROR("can't start precreate thread %ld\n", PTR_ERR(task));
1574 RETURN(PTR_ERR(task));
1577 l_wait_event(d->opd_pre_thread.t_ctl_waitq,
1578 osp_precreate_running(d) || osp_precreate_stopped(d),
1585 * Finish precreate functionality of OSP
1588 * Asks all the activity (the thread, update timer) to stop, then
1589 * wait till that is done.
1591 * \param[in] d OSP device
1593 void osp_precreate_fini(struct osp_device *d)
1595 struct ptlrpc_thread *thread;
1599 cfs_timer_disarm(&d->opd_statfs_timer);
1601 if (d->opd_pre == NULL)
1604 thread = &d->opd_pre_thread;
1606 thread->t_flags = SVC_STOPPING;
1607 wake_up(&d->opd_pre_waitq);
1609 wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
1611 OBD_FREE_PTR(d->opd_pre);