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>
49 #include <lustre_obdo.h>
51 #include "osp_internal.h"
54 * there are two specific states to take care about:
56 * = import is disconnected =
58 * = import is inactive =
59 * in this case osp_declare_object_create() returns an error
65 * Check whether statfs data is expired
67 * OSP device caches statfs data for the target, the function checks
68 * whether the data is expired or not.
70 * \param[in] d OSP device
72 * \retval 0 - not expired, 1 - expired
74 static inline int osp_statfs_need_update(struct osp_device *d)
76 return !cfs_time_before(cfs_time_current(),
77 d->opd_statfs_fresh_till);
81 * OSP tries to maintain pool of available objects so that calls to create
82 * objects don't block most of time
84 * each time OSP gets connected to OST, we should start from precreation cleanup
86 static inline bool osp_precreate_running(struct osp_device *d)
88 return !!(d->opd_pre_thread.t_flags & SVC_RUNNING);
91 static inline bool osp_precreate_stopped(struct osp_device *d)
93 return !!(d->opd_pre_thread.t_flags & SVC_STOPPED);
96 static void osp_statfs_timer_cb(unsigned long _d)
98 struct osp_device *d = (struct osp_device *) _d;
101 if (d->opd_pre != NULL && osp_precreate_running(d))
102 wake_up(&d->opd_pre_waitq);
106 * RPC interpret callback for OST_STATFS RPC
108 * An interpretation callback called by ptlrpc for OST_STATFS RPC when it is
109 * replied by the target. It's used to maintain statfs cache for the target.
110 * The function fills data from the reply if successful and schedules another
113 * \param[in] env LU environment provided by the caller
114 * \param[in] req RPC replied
115 * \param[in] aa callback data
116 * \param[in] rc RPC result
118 * \retval 0 on success
119 * \retval negative negated errno on error
121 static int osp_statfs_interpret(const struct lu_env *env,
122 struct ptlrpc_request *req,
123 union ptlrpc_async_args *aa, int rc)
125 struct obd_import *imp = req->rq_import;
126 struct obd_statfs *msfs;
127 struct osp_device *d;
131 aa = ptlrpc_req_async_args(req);
132 d = aa->pointer_arg[0];
138 msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
140 GOTO(out, rc = -EPROTO);
142 d->opd_statfs = *msfs;
144 osp_pre_update_status(d, rc);
146 /* schedule next update */
147 d->opd_statfs_fresh_till = cfs_time_shift(d->opd_statfs_maxage);
148 cfs_timer_arm(&d->opd_statfs_timer, d->opd_statfs_fresh_till);
149 d->opd_statfs_update_in_progress = 0;
151 CDEBUG(D_CACHE, "updated statfs %p\n", d);
155 /* couldn't update statfs, try again as soon as possible */
156 if (d->opd_pre != NULL && osp_precreate_running(d))
157 wake_up(&d->opd_pre_waitq);
159 if (req->rq_import_generation == imp->imp_generation)
160 CDEBUG(D_CACHE, "%s: couldn't update statfs: rc = %d\n",
161 d->opd_obd->obd_name, rc);
166 * Send OST_STATFS RPC
168 * Sends OST_STATFS RPC to refresh cached statfs data for the target.
169 * Also disables scheduled updates as times OSP may need to refresh
170 * statfs data before expiration. The function doesn't block, instead
171 * an interpretation callback osp_statfs_interpret() is used.
173 * \param[in] d OSP device
175 static int osp_statfs_update(struct osp_device *d)
177 struct ptlrpc_request *req;
178 struct obd_import *imp;
179 union ptlrpc_async_args *aa;
184 CDEBUG(D_CACHE, "going to update statfs\n");
186 imp = d->opd_obd->u.cli.cl_import;
189 req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
193 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
195 ptlrpc_request_free(req);
198 ptlrpc_request_set_replen(req);
199 req->rq_request_portal = OST_CREATE_PORTAL;
200 ptlrpc_at_set_req_timeout(req);
202 req->rq_interpret_reply = (ptlrpc_interpterer_t)osp_statfs_interpret;
203 aa = ptlrpc_req_async_args(req);
204 aa->pointer_arg[0] = d;
207 * no updates till reply
209 cfs_timer_disarm(&d->opd_statfs_timer);
210 d->opd_statfs_fresh_till = cfs_time_shift(obd_timeout * 1000);
211 d->opd_statfs_update_in_progress = 1;
213 ptlrpcd_add_req(req);
219 * Schedule an immediate update for statfs data
221 * If cached statfs data claim no free space, but OSP has got a request to
222 * destroy an object (so release some space probably), then we may need to
223 * refresh cached statfs data sooner than planned. The function checks there
224 * is no statfs update going and schedules immediate update if so.
225 * XXX: there might be a case where removed object(s) do not add free space (empty
226 * object). If the number of such deletions is high, then we can start to update
227 * statfs too often causing a RPC storm. some throttling is needed...
229 * \param[in] d OSP device where statfs data needs to be refreshed
231 void osp_statfs_need_now(struct osp_device *d)
233 if (!d->opd_statfs_update_in_progress) {
235 * if current status is -ENOSPC (lack of free space on OST)
236 * then we should poll OST immediately once object destroy
239 d->opd_statfs_fresh_till = cfs_time_shift(-1);
240 cfs_timer_disarm(&d->opd_statfs_timer);
241 wake_up(&d->opd_pre_waitq);
246 * Return number of precreated objects
248 * A simple helper to calculate the number of precreated objects on the device.
250 * \param[in] env LU environment provided by the caller
251 * \param[in] osp OSP device
253 * \retval the number of the precreated objects
255 static inline int osp_objs_precreated(const struct lu_env *env,
256 struct osp_device *osp)
258 return osp_fid_diff(&osp->opd_pre_last_created_fid,
259 &osp->opd_pre_used_fid);
263 * Check pool of precreated objects is nearly empty
265 * We should not wait till the pool of the precreated objects is exhausted,
266 * because then there will be a long period of OSP being unavailable for the
267 * new creations due to lenghty precreate RPC. Instead we ask for another
268 * precreation ahead and hopefully have it ready before the current pool is
269 * empty. Notice this function relies on an external locking.
271 * \param[in] env LU environment provided by the caller
272 * \param[in] d OSP device
274 * \retval 0 - current pool is good enough, 1 - time to precreate
276 static inline int osp_precreate_near_empty_nolock(const struct lu_env *env,
277 struct osp_device *d)
279 int window = osp_objs_precreated(env, d);
281 /* don't consider new precreation till OST is healty and
283 return ((window - d->opd_pre_reserved < d->opd_pre_create_count / 2) &&
284 (d->opd_pre_status == 0));
288 * Check pool of precreated objects
290 * This is protected version of osp_precreate_near_empty_nolock(), check that
293 * \param[in] env LU environment provided by the caller
294 * \param[in] d OSP device
296 * \retval 0 - current pool is good enough, 1 - time to precreate
298 static inline int osp_precreate_near_empty(const struct lu_env *env,
299 struct osp_device *d)
303 /* XXX: do we really need locking here? */
304 spin_lock(&d->opd_pre_lock);
305 rc = osp_precreate_near_empty_nolock(env, d);
306 spin_unlock(&d->opd_pre_lock);
311 * Check given sequence is empty
313 * Returns a binary result whether the given sequence has some IDs left
314 * or not. Find the details in osp_fid_end_seq(). This is a lock protected
315 * version of that function.
317 * \param[in] env LU environment provided by the caller
318 * \param[in] osp OSP device
320 * \retval 0 - current sequence has no IDs, 1 - otherwise
322 static inline int osp_create_end_seq(const struct lu_env *env,
323 struct osp_device *osp)
325 struct lu_fid *fid = &osp->opd_pre_used_fid;
328 spin_lock(&osp->opd_pre_lock);
329 rc = osp_fid_end_seq(env, fid);
330 spin_unlock(&osp->opd_pre_lock);
335 * Write FID into into last_oid/last_seq file
337 * The function stores the sequence and the in-sequence id into two dedicated
338 * files. The sync argument can be used to request synchronous commit, so the
339 * function won't return until the updates are committed.
341 * \param[in] env LU environment provided by the caller
342 * \param[in] osp OSP device
343 * \param[in] fid fid where sequence/id is taken
344 * \param[in] sync update mode: 0 - asynchronously, 1 - synchronously
346 * \retval 0 on success
347 * \retval negative negated errno on error
349 int osp_write_last_oid_seq_files(struct lu_env *env, struct osp_device *osp,
350 struct lu_fid *fid, int sync)
352 struct osp_thread_info *oti = osp_env_info(env);
353 struct lu_buf *lb_oid = &oti->osi_lb;
354 struct lu_buf *lb_oseq = &oti->osi_lb2;
361 /* Note: through f_oid is only 32 bits, it will also write 64 bits
362 * for oid to keep compatibility with the previous version. */
363 lb_oid->lb_buf = &fid->f_oid;
364 lb_oid->lb_len = sizeof(u64);
365 oid_off = sizeof(u64) * osp->opd_index;
367 lb_oseq->lb_buf = &fid->f_seq;
368 lb_oseq->lb_len = sizeof(u64);
369 oseq_off = sizeof(u64) * osp->opd_index;
371 th = dt_trans_create(env, osp->opd_storage);
376 rc = dt_declare_record_write(env, osp->opd_last_used_oid_file,
377 lb_oid, oid_off, th);
381 rc = dt_declare_record_write(env, osp->opd_last_used_seq_file,
382 lb_oseq, oseq_off, th);
386 rc = dt_trans_start_local(env, osp->opd_storage, th);
390 rc = dt_record_write(env, osp->opd_last_used_oid_file, lb_oid,
393 CERROR("%s: can not write to last seq file: rc = %d\n",
394 osp->opd_obd->obd_name, rc);
397 rc = dt_record_write(env, osp->opd_last_used_seq_file, lb_oseq,
400 CERROR("%s: can not write to last seq file: rc = %d\n",
401 osp->opd_obd->obd_name, rc);
405 dt_trans_stop(env, osp->opd_storage, th);
410 * Switch to another sequence
412 * When a current sequence has no available IDs left, OSP has to switch to
413 * another new sequence. OSP requests it using the regular FLDB protocol
414 * and stores synchronously before that is used in precreated. This is needed
415 * to basically have the sequences referenced (not orphaned), otherwise it's
416 * possible that OST has some objects precreated and the clients have data
417 * written to it, but after MDT failover nobody refers those objects and OSP
418 * has no idea that the sequence need cleanup to be done.
419 * While this is very expensive operation, it's supposed to happen very very
420 * infrequently because sequence has 2^32 or 2^48 objects (depending on type)
422 * \param[in] env LU environment provided by the caller
423 * \param[in] osp OSP device
425 * \retval 0 on success
426 * \retval negative negated errno on error
428 static int osp_precreate_rollover_new_seq(struct lu_env *env,
429 struct osp_device *osp)
431 struct lu_fid *fid = &osp_env_info(env)->osi_fid;
432 struct lu_fid *last_fid = &osp->opd_last_used_fid;
436 rc = seq_client_get_seq(env, osp->opd_obd->u.cli.cl_seq, &fid->f_seq);
438 CERROR("%s: alloc fid error: rc = %d\n",
439 osp->opd_obd->obd_name, rc);
445 LASSERTF(fid_seq(fid) != fid_seq(last_fid),
446 "fid "DFID", last_fid "DFID"\n", PFID(fid),
449 rc = osp_write_last_oid_seq_files(env, osp, fid, 1);
451 CERROR("%s: Can not update oid/seq file: rc = %d\n",
452 osp->opd_obd->obd_name, rc);
456 LCONSOLE_INFO("%s: update sequence from "LPX64" to "LPX64"\n",
457 osp->opd_obd->obd_name, fid_seq(last_fid),
459 /* Update last_xxx to the new seq */
460 spin_lock(&osp->opd_pre_lock);
461 osp->opd_last_used_fid = *fid;
462 osp->opd_gap_start_fid = *fid;
463 osp->opd_pre_used_fid = *fid;
464 osp->opd_pre_last_created_fid = *fid;
465 spin_unlock(&osp->opd_pre_lock);
471 * Find IDs available in current sequence
473 * The function calculates the highest possible ID and the number of IDs
474 * available in the current sequence OSP is using. The number is limited
475 * artifically by the caller (grow param) and the number of IDs available
476 * in the sequence by nature. The function doesn't require an external
479 * \param[in] env LU environment provided by the caller
480 * \param[in] osp OSP device
481 * \param[in] fid FID the caller wants to start with
482 * \param[in] grow how many the caller wants
483 * \param[out] fid the highest calculated FID
484 * \param[out] grow the number of available IDs calculated
486 * \retval 0 on success, 1 - the sequence is empty
488 static int osp_precreate_fids(const struct lu_env *env, struct osp_device *osp,
489 struct lu_fid *fid, int *grow)
491 struct osp_thread_info *osi = osp_env_info(env);
495 if (fid_is_idif(fid)) {
496 struct lu_fid *last_fid;
497 struct ost_id *oi = &osi->osi_oi;
499 spin_lock(&osp->opd_pre_lock);
500 last_fid = &osp->opd_pre_last_created_fid;
501 fid_to_ostid(last_fid, oi);
502 end = min(ostid_id(oi) + *grow, IDIF_MAX_OID);
503 *grow = end - ostid_id(oi);
504 ostid_set_id(oi, ostid_id(oi) + *grow);
505 spin_unlock(&osp->opd_pre_lock);
510 ostid_to_fid(fid, oi, osp->opd_index);
514 spin_lock(&osp->opd_pre_lock);
515 *fid = osp->opd_pre_last_created_fid;
517 end = min((end + *grow), (__u64)LUSTRE_DATA_SEQ_MAX_WIDTH);
518 *grow = end - fid->f_oid;
519 fid->f_oid += end - fid->f_oid;
520 spin_unlock(&osp->opd_pre_lock);
522 CDEBUG(D_INFO, "Expect %d, actual %d ["DFID" -- "DFID"]\n",
523 *grow, i, PFID(fid), PFID(&osp->opd_pre_last_created_fid));
525 return *grow > 0 ? 0 : 1;
529 * Prepare and send precreate RPC
531 * The function finds how many objects should be precreated. Then allocates,
532 * prepares and schedules precreate RPC synchronously. Upon reply the function
533 * wake ups the threads waiting for the new objects on this target. If the
534 * target wasn't able to create all the objects requested, then the next
535 * precreate will be asking less objects (i.e. slow precreate down).
537 * \param[in] env LU environment provided by the caller
538 * \param[in] d OSP device
540 * \retval 0 on success
541 * \retval negative negated errno on error
543 static int osp_precreate_send(const struct lu_env *env, struct osp_device *d)
545 struct osp_thread_info *oti = osp_env_info(env);
546 struct ptlrpc_request *req;
547 struct obd_import *imp;
548 struct ost_body *body;
550 struct lu_fid *fid = &oti->osi_fid;
553 /* don't precreate new objects till OST healthy and has free space */
554 if (unlikely(d->opd_pre_status)) {
555 CDEBUG(D_INFO, "%s: don't send new precreate: rc = %d\n",
556 d->opd_obd->obd_name, d->opd_pre_status);
561 * if not connection/initialization is compeleted, ignore
563 imp = d->opd_obd->u.cli.cl_import;
566 req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
569 req->rq_request_portal = OST_CREATE_PORTAL;
570 /* we should not resend create request - anyway we will have delorphan
571 * and kill these objects */
572 req->rq_no_delay = req->rq_no_resend = 1;
574 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
576 ptlrpc_request_free(req);
580 spin_lock(&d->opd_pre_lock);
581 if (d->opd_pre_create_count > d->opd_pre_max_create_count / 2)
582 d->opd_pre_create_count = d->opd_pre_max_create_count / 2;
583 grow = d->opd_pre_create_count;
584 spin_unlock(&d->opd_pre_lock);
586 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
589 *fid = d->opd_pre_last_created_fid;
590 rc = osp_precreate_fids(env, d, fid, &grow);
592 /* Current seq has been used up*/
593 if (!osp_is_fid_client(d)) {
594 osp_pre_update_status(d, -ENOSPC);
597 wake_up(&d->opd_pre_waitq);
601 if (!osp_is_fid_client(d)) {
602 /* Non-FID client will always send seq 0 because of
604 LASSERTF(fid_is_idif(fid), "Invalid fid "DFID"\n", PFID(fid));
608 fid_to_ostid(fid, &body->oa.o_oi);
609 body->oa.o_valid = OBD_MD_FLGROUP;
611 ptlrpc_request_set_replen(req);
613 if (OBD_FAIL_CHECK(OBD_FAIL_OSP_FAKE_PRECREATE))
616 rc = ptlrpc_queue_wait(req);
618 CERROR("%s: can't precreate: rc = %d\n", d->opd_obd->obd_name,
622 LASSERT(req->rq_transno == 0);
624 body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
626 GOTO(out_req, rc = -EPROTO);
628 ostid_to_fid(fid, &body->oa.o_oi, d->opd_index);
631 if (osp_fid_diff(fid, &d->opd_pre_used_fid) <= 0) {
632 CERROR("%s: precreate fid "DFID" < local used fid "DFID
633 ": rc = %d\n", d->opd_obd->obd_name,
634 PFID(fid), PFID(&d->opd_pre_used_fid), -ESTALE);
635 GOTO(out_req, rc = -ESTALE);
638 diff = osp_fid_diff(fid, &d->opd_pre_last_created_fid);
640 spin_lock(&d->opd_pre_lock);
642 /* the OST has not managed to create all the
643 * objects we asked for */
644 d->opd_pre_create_count = max(diff, OST_MIN_PRECREATE);
645 d->opd_pre_create_slow = 1;
647 /* the OST is able to keep up with the work,
648 * we could consider increasing create_count
649 * next time if needed */
650 d->opd_pre_create_slow = 0;
653 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
654 fid_to_ostid(fid, &body->oa.o_oi);
656 d->opd_pre_last_created_fid = *fid;
657 spin_unlock(&d->opd_pre_lock);
659 CDEBUG(D_HA, "%s: current precreated pool: "DFID"-"DFID"\n",
660 d->opd_obd->obd_name, PFID(&d->opd_pre_used_fid),
661 PFID(&d->opd_pre_last_created_fid));
663 /* now we can wakeup all users awaiting for objects */
664 osp_pre_update_status(d, rc);
665 wake_up(&d->opd_pre_user_waitq);
667 ptlrpc_req_finished(req);
672 * Get last precreated object from target (OST)
674 * Sends synchronous RPC to the target (OST) to learn the last precreated
675 * object. This later is used to remove all unused objects (cleanup orphan
676 * procedure). Also, the next object after one we got will be used as a
677 * starting point for the new precreates.
679 * \param[in] env LU environment provided by the caller
680 * \param[in] d OSP device
682 * \retval 0 on success
683 * \retval negative negated errno on error
685 static int osp_get_lastfid_from_ost(const struct lu_env *env,
686 struct osp_device *d)
688 struct ptlrpc_request *req = NULL;
689 struct obd_import *imp;
690 struct lu_fid *last_fid;
695 imp = d->opd_obd->u.cli.cl_import;
698 req = ptlrpc_request_alloc(imp, &RQF_OST_GET_INFO_LAST_FID);
702 req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY, RCL_CLIENT,
703 sizeof(KEY_LAST_FID));
705 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
707 ptlrpc_request_free(req);
711 tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
712 memcpy(tmp, KEY_LAST_FID, sizeof(KEY_LAST_FID));
714 req->rq_no_delay = req->rq_no_resend = 1;
715 last_fid = req_capsule_client_get(&req->rq_pill, &RMF_FID);
716 fid_cpu_to_le(last_fid, &d->opd_last_used_fid);
718 ptlrpc_request_set_replen(req);
720 rc = ptlrpc_queue_wait(req);
722 /* bad-bad OST.. let sysadm sort this out */
723 if (rc == -ENOTSUPP) {
724 CERROR("%s: server does not support FID: rc = %d\n",
725 d->opd_obd->obd_name, -ENOTSUPP);
727 ptlrpc_set_import_active(imp, 0);
731 last_fid = req_capsule_server_get(&req->rq_pill, &RMF_FID);
732 if (last_fid == NULL) {
733 CERROR("%s: Got last_fid failed.\n", d->opd_obd->obd_name);
734 GOTO(out, rc = -EPROTO);
737 if (!fid_is_sane(last_fid)) {
738 CERROR("%s: Got insane last_fid "DFID"\n",
739 d->opd_obd->obd_name, PFID(last_fid));
740 GOTO(out, rc = -EPROTO);
743 /* Only update the last used fid, if the OST has objects for
744 * this sequence, i.e. fid_oid > 0 */
745 if (fid_oid(last_fid) > 0)
746 d->opd_last_used_fid = *last_fid;
748 CDEBUG(D_HA, "%s: Got last_fid "DFID"\n", d->opd_obd->obd_name,
752 ptlrpc_req_finished(req);
757 * Cleanup orphans on OST
759 * This function is called in a contex of a dedicated thread handling
760 * all the precreation suff. The function waits till local recovery
761 * is complete, then identify all the unreferenced objects (orphans)
762 * using the highest ID referenced by a local and the highest object
763 * precreated by the target. The found range is a subject to removal
764 * using specially flagged RPC. During this process OSP is marked
765 * unavailable for new objects.
767 * \param[in] env LU environment provided by the caller
768 * \param[in] d OSP device
770 * \retval 0 on success
771 * \retval negative negated errno on error
773 static int osp_precreate_cleanup_orphans(struct lu_env *env,
774 struct osp_device *d)
776 struct osp_thread_info *osi = osp_env_info(env);
777 struct lu_fid *last_fid = &osi->osi_fid;
778 struct ptlrpc_request *req = NULL;
779 struct obd_import *imp;
780 struct ost_body *body;
781 struct l_wait_info lwi = { 0 };
782 int update_status = 0;
789 * wait for local recovery to finish, so we can cleanup orphans
790 * orphans are all objects since "last used" (assigned), but
791 * there might be objects reserved and in some cases they won't
792 * be used. we can't cleanup them till we're sure they won't be
793 * used. also can't we allow new reservations because they may
794 * end up getting orphans being cleaned up below. so we block
795 * new reservations and wait till all reserved objects either
798 spin_lock(&d->opd_pre_lock);
799 d->opd_pre_recovering = 1;
800 spin_unlock(&d->opd_pre_lock);
802 * The locking above makes sure the opd_pre_reserved check below will
803 * catch all osp_precreate_reserve() calls who find
804 * "!opd_pre_recovering".
806 l_wait_event(d->opd_pre_waitq,
807 (!d->opd_pre_reserved && d->opd_recovery_completed) ||
808 !osp_precreate_running(d) || d->opd_got_disconnected,
810 if (!osp_precreate_running(d) || d->opd_got_disconnected)
811 GOTO(out, rc = -EAGAIN);
813 CDEBUG(D_HA, "%s: going to cleanup orphans since "DFID"\n",
814 d->opd_obd->obd_name, PFID(&d->opd_last_used_fid));
816 *last_fid = d->opd_last_used_fid;
817 /* The OSP should already get the valid seq now */
818 LASSERT(!fid_is_zero(last_fid));
819 if (fid_oid(&d->opd_last_used_fid) < 2) {
820 /* lastfid looks strange... ask OST */
821 rc = osp_get_lastfid_from_ost(env, d);
826 imp = d->opd_obd->u.cli.cl_import;
829 req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
831 GOTO(out, rc = -ENOMEM);
833 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
835 ptlrpc_request_free(req);
840 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
842 GOTO(out, rc = -EPROTO);
844 body->oa.o_flags = OBD_FL_DELORPHAN;
845 body->oa.o_valid = OBD_MD_FLFLAGS | OBD_MD_FLGROUP;
847 fid_to_ostid(&d->opd_last_used_fid, &body->oa.o_oi);
849 ptlrpc_request_set_replen(req);
851 /* Don't resend the delorphan req */
852 req->rq_no_resend = req->rq_no_delay = 1;
854 rc = ptlrpc_queue_wait(req);
860 body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
862 GOTO(out, rc = -EPROTO);
865 * OST provides us with id new pool starts from in body->oa.o_id
867 ostid_to_fid(last_fid, &body->oa.o_oi, d->opd_index);
869 spin_lock(&d->opd_pre_lock);
870 diff = osp_fid_diff(&d->opd_last_used_fid, last_fid);
872 d->opd_pre_create_count = OST_MIN_PRECREATE + diff;
873 d->opd_pre_last_created_fid = d->opd_last_used_fid;
875 d->opd_pre_create_count = OST_MIN_PRECREATE;
876 d->opd_pre_last_created_fid = *last_fid;
879 * This empties the pre-creation pool and effectively blocks any new
882 LASSERT(fid_oid(&d->opd_pre_last_created_fid) <=
883 LUSTRE_DATA_SEQ_MAX_WIDTH);
884 d->opd_pre_used_fid = d->opd_pre_last_created_fid;
885 d->opd_pre_create_slow = 0;
886 spin_unlock(&d->opd_pre_lock);
888 CDEBUG(D_HA, "%s: Got last_id "DFID" from OST, last_created "DFID
889 "last_used is "DFID"\n", d->opd_obd->obd_name, PFID(last_fid),
890 PFID(&d->opd_pre_last_created_fid), PFID(&d->opd_last_used_fid));
893 ptlrpc_req_finished(req);
895 spin_lock(&d->opd_pre_lock);
896 d->opd_pre_recovering = 0;
897 spin_unlock(&d->opd_pre_lock);
900 * If rc is zero, the pre-creation window should have been emptied.
901 * Since waking up the herd would be useless without pre-created
902 * objects, we defer the signal to osp_precreate_send() in that case.
906 CERROR("%s: cannot cleanup orphans: rc = %d\n",
907 d->opd_obd->obd_name, rc);
908 /* we can't proceed from here, OST seem to
909 * be in a bad shape, better to wait for
910 * a new instance of the server and repeat
911 * from the beginning. notify possible waiters
912 * this OSP isn't quite functional yet */
913 osp_pre_update_status(d, rc);
915 wake_up(&d->opd_pre_user_waitq);
923 * Update precreate status using statfs data
925 * The function decides whether this OSP should be used for new objects.
926 * IOW, whether this OST is used up or has some free space. Cached statfs
927 * data is used to make this decision. If the latest result of statfs
928 * request (rc argument) is not success, then just mark OSP unavailable
931 * Add a bit of hysteresis so this flag isn't continually flapping,
932 * and ensure that new files don't get extremely fragmented due to
933 * only a small amount of available space in the filesystem.
934 * We want to set the NOSPC flag when there is less than ~0.1% free
935 * and clear it when there is at least ~0.2% free space, so:
936 * avail < ~0.1% max max = avail + used
937 * 1025 * avail < avail + used used = blocks - free
938 * 1024 * avail < used
939 * 1024 * avail < blocks - free
940 * avail < ((blocks - free) >> 10)
942 * On very large disk, say 16TB 0.1% will be 16 GB. We don't want to
943 * lose that amount of space so in those cases we report no space left
944 * if their is less than 1 GB left.
945 * the function updates current precreation status used: functional or not
947 * \param[in] d OSP device
948 * \param[in] rc new precreate status for device \a d
950 * \retval 0 on success
951 * \retval negative negated errno on error
953 void osp_pre_update_status(struct osp_device *d, int rc)
955 struct obd_statfs *msfs = &d->opd_statfs;
956 int old = d->opd_pre_status;
959 d->opd_pre_status = rc;
963 if (likely(msfs->os_type)) {
964 used = min_t(__u64, (msfs->os_blocks - msfs->os_bfree) >> 10,
966 if ((msfs->os_ffree < 32) || (msfs->os_bavail < used)) {
967 d->opd_pre_status = -ENOSPC;
969 CDEBUG(D_INFO, "%s: status: "LPU64" blocks, "
970 LPU64" free, "LPU64" used, "LPU64" "
971 "avail -> %d: rc = %d\n",
972 d->opd_obd->obd_name, msfs->os_blocks,
973 msfs->os_bfree, used, msfs->os_bavail,
974 d->opd_pre_status, rc);
976 "non-committed changes: %lu, in progress: %u\n",
977 d->opd_syn_changes, d->opd_syn_rpc_in_progress);
978 } else if (old == -ENOSPC) {
979 d->opd_pre_status = 0;
980 spin_lock(&d->opd_pre_lock);
981 d->opd_pre_create_slow = 0;
982 d->opd_pre_create_count = OST_MIN_PRECREATE;
983 spin_unlock(&d->opd_pre_lock);
984 wake_up(&d->opd_pre_waitq);
985 CDEBUG(D_INFO, "%s: no space: "LPU64" blocks, "LPU64
986 " free, "LPU64" used, "LPU64" avail -> %d: "
987 "rc = %d\n", d->opd_obd->obd_name,
988 msfs->os_blocks, msfs->os_bfree, used,
989 msfs->os_bavail, d->opd_pre_status, rc);
994 wake_up(&d->opd_pre_user_waitq);
998 * Initialize FID for precreation
1000 * For a just created new target, a new sequence should be taken.
1001 * The function checks there is no IDIF in use (if the target was
1002 * added with the older version of Lustre), then requests a new
1003 * sequence from FLDB using the regular protocol. Then this new
1004 * sequence is stored on a persisten storage synchronously to prevent
1005 * possible object leakage (for the detail see the description for
1006 * osp_precreate_rollover_new_seq()).
1008 * \param[in] osp OSP device
1010 * \retval 0 on success
1011 * \retval negative negated errno on error
1013 int osp_init_pre_fid(struct osp_device *osp)
1016 struct osp_thread_info *osi;
1017 struct lu_client_seq *cli_seq;
1018 struct lu_fid *last_fid;
1022 LASSERT(osp->opd_pre != NULL);
1024 /* Return if last_used fid has been initialized */
1025 if (!fid_is_zero(&osp->opd_last_used_fid))
1028 rc = lu_env_init(&env, osp->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
1030 CERROR("%s: init env error: rc = %d\n",
1031 osp->opd_obd->obd_name, rc);
1035 osi = osp_env_info(&env);
1036 last_fid = &osi->osi_fid;
1038 /* For a freshed fs, it will allocate a new sequence first */
1039 if (osp_is_fid_client(osp) && osp->opd_group != 0) {
1040 cli_seq = osp->opd_obd->u.cli.cl_seq;
1041 rc = seq_client_get_seq(&env, cli_seq, &last_fid->f_seq);
1043 CERROR("%s: alloc fid error: rc = %d\n",
1044 osp->opd_obd->obd_name, rc);
1048 last_fid->f_seq = fid_idif_seq(0, osp->opd_index);
1050 last_fid->f_oid = 1;
1051 last_fid->f_ver = 0;
1053 spin_lock(&osp->opd_pre_lock);
1054 osp->opd_last_used_fid = *last_fid;
1055 osp->opd_pre_used_fid = *last_fid;
1056 osp->opd_pre_last_created_fid = *last_fid;
1057 spin_unlock(&osp->opd_pre_lock);
1058 rc = osp_write_last_oid_seq_files(&env, osp, last_fid, 1);
1060 CERROR("%s: write fid error: rc = %d\n",
1061 osp->opd_obd->obd_name, rc);
1070 * The core of precreate functionality
1072 * The function implements the main precreation loop. Basically it
1073 * involves connecting to the target, precerate FID initialization,
1074 * identifying and removing orphans, then serving precreation. As
1075 * part of the latter, the thread is responsible for statfs data
1076 * updates. The precreation is mostly driven by another threads
1077 * asking for new OST objects - those askers wake the thread when
1078 * the number of precreated objects reach low watermark.
1079 * After a disconnect, the sequence above repeats. This is keep going
1080 * until the thread is requested to stop.
1082 * \param[in] _arg private data the thread (OSP device to handle)
1084 * \retval 0 on success
1085 * \retval negative negated errno on error
1087 static int osp_precreate_thread(void *_arg)
1089 struct osp_device *d = _arg;
1090 struct ptlrpc_thread *thread = &d->opd_pre_thread;
1091 struct l_wait_info lwi = { 0 };
1092 struct l_wait_info lwi2 = LWI_TIMEOUT(cfs_time_seconds(5),
1093 back_to_sleep, NULL);
1099 rc = lu_env_init(&env, d->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
1101 CERROR("%s: init env error: rc = %d\n", d->opd_obd->obd_name,
1106 spin_lock(&d->opd_pre_lock);
1107 thread->t_flags = SVC_RUNNING;
1108 spin_unlock(&d->opd_pre_lock);
1109 wake_up(&thread->t_ctl_waitq);
1111 while (osp_precreate_running(d)) {
1113 * need to be connected to OST
1115 while (osp_precreate_running(d)) {
1116 l_wait_event(d->opd_pre_waitq,
1117 !osp_precreate_running(d) ||
1118 d->opd_new_connection,
1121 if (!d->opd_new_connection)
1124 d->opd_new_connection = 0;
1125 d->opd_got_disconnected = 0;
1129 if (!osp_precreate_running(d))
1132 LASSERT(d->opd_obd->u.cli.cl_seq != NULL);
1133 /* Sigh, fid client is not ready yet */
1134 if (d->opd_obd->u.cli.cl_seq->lcs_exp == NULL)
1137 /* Init fid for osp_precreate if necessary */
1138 rc = osp_init_pre_fid(d);
1140 class_export_put(d->opd_exp);
1141 d->opd_obd->u.cli.cl_seq->lcs_exp = NULL;
1142 CERROR("%s: init pre fid error: rc = %d\n",
1143 d->opd_obd->obd_name, rc);
1147 if (osp_statfs_update(d)) {
1148 l_wait_event(d->opd_pre_waitq,
1149 !osp_precreate_running(d), &lwi2);
1154 * Clean up orphans or recreate missing objects.
1156 rc = osp_precreate_cleanup_orphans(&env, d);
1160 * connected, can handle precreates now
1162 while (osp_precreate_running(d)) {
1163 l_wait_event(d->opd_pre_waitq,
1164 !osp_precreate_running(d) ||
1165 osp_precreate_near_empty(&env, d) ||
1166 osp_statfs_need_update(d) ||
1167 d->opd_got_disconnected, &lwi);
1169 if (!osp_precreate_running(d))
1172 /* something happened to the connection
1173 * have to start from the beginning */
1174 if (d->opd_got_disconnected)
1177 if (osp_statfs_need_update(d))
1178 if (osp_statfs_update(d))
1181 /* To avoid handling different seq in precreate/orphan
1182 * cleanup, it will hold precreate until current seq is
1184 if (unlikely(osp_precreate_end_seq(&env, d) &&
1185 !osp_create_end_seq(&env, d)))
1188 if (unlikely(osp_precreate_end_seq(&env, d) &&
1189 osp_create_end_seq(&env, d))) {
1190 LCONSOLE_INFO("%s:"LPX64" is used up."
1191 " Update to new seq\n",
1192 d->opd_obd->obd_name,
1193 fid_seq(&d->opd_pre_last_created_fid));
1194 rc = osp_precreate_rollover_new_seq(&env, d);
1199 if (osp_precreate_near_empty(&env, d)) {
1200 rc = osp_precreate_send(&env, d);
1201 /* osp_precreate_send() sets opd_pre_status
1202 * in case of error, that prevent the using of
1204 if (rc < 0 && rc != -ENOSPC &&
1205 rc != -ETIMEDOUT && rc != -ENOTCONN)
1206 CERROR("%s: cannot precreate objects:"
1208 d->opd_obd->obd_name, rc);
1213 thread->t_flags = SVC_STOPPED;
1215 wake_up(&thread->t_ctl_waitq);
1221 * Check when to stop to wait for precreate objects.
1223 * The caller wanting a new OST object can't wait undefinitely. The
1224 * function checks for few conditions including available new OST
1225 * objects, disconnected OST, lack of space with no pending destroys,
1226 * etc. IOW, it checks whether the current OSP state is good to keep
1227 * waiting or it's better to give up.
1229 * \param[in] env LU environment provided by the caller
1230 * \param[in] d OSP device
1232 * \retval 0 - keep waiting, 1 - no luck
1234 static int osp_precreate_ready_condition(const struct lu_env *env,
1235 struct osp_device *d)
1237 if (d->opd_pre_recovering)
1240 /* ready if got enough precreated objects */
1241 /* we need to wait for others (opd_pre_reserved) and our object (+1) */
1242 if (d->opd_pre_reserved + 1 < osp_objs_precreated(env, d))
1245 /* ready if OST reported no space and no destroys in progress */
1246 if (d->opd_syn_changes + d->opd_syn_rpc_in_progress == 0 &&
1247 d->opd_pre_status == -ENOSPC)
1250 /* Bail out I/O fails to OST */
1251 if (d->opd_pre_status != 0 &&
1252 d->opd_pre_status != -EAGAIN &&
1253 d->opd_pre_status != -ENODEV &&
1254 d->opd_pre_status != -ENOTCONN &&
1255 d->opd_pre_status != -ENOSPC) {
1257 if (d->opd_pre_status != -EIO)
1258 CERROR("%s: precreate failed opd_pre_status %d\n",
1259 d->opd_obd->obd_name, d->opd_pre_status);
1266 static int osp_precreate_timeout_condition(void *data)
1268 struct osp_device *d = data;
1270 CDEBUG(D_HA, "%s: slow creates, last="DFID", next="DFID", "
1271 "reserved="LPU64", syn_changes=%lu, "
1272 "syn_rpc_in_progress=%d, status=%d\n",
1273 d->opd_obd->obd_name, PFID(&d->opd_pre_last_created_fid),
1274 PFID(&d->opd_pre_used_fid), d->opd_pre_reserved,
1275 d->opd_syn_changes, d->opd_syn_rpc_in_progress,
1282 * Reserve object in precreate pool
1284 * When the caller wants to create a new object on this target (target
1285 * represented by the given OSP), it should declare this intention using
1286 * a regular ->dt_declare_create() OSD API method. Then OSP will be trying
1287 * to reserve an object in the existing precreated pool or wait up to
1288 * obd_timeout for the available object to appear in the pool (a dedicated
1289 * thread will be doing real precreation in background). The object can be
1290 * consumed later with osp_precreate_get_fid() or be released with call to
1291 * lu_object_put(). Notice the function doesn't reserve a specific ID, just
1292 * some ID. The actual ID assignment happen in osp_precreate_get_fid().
1293 * If the space on the target is short and there is a pending object destroy,
1294 * then the function forces local commit to speedup space release (see
1295 * osp_sync.c for the details).
1297 * \param[in] env LU environment provided by the caller
1298 * \param[in] d OSP device
1300 * \retval 0 on success
1301 * \retval -ENOSPC when no space on OST
1302 * \retval -EAGAIN try later, slow precreation in progress
1303 * \retval -EIO when no access to OST
1305 int osp_precreate_reserve(const struct lu_env *env, struct osp_device *d)
1307 struct l_wait_info lwi;
1308 cfs_time_t expire = cfs_time_shift(obd_timeout);
1313 LASSERTF(osp_objs_precreated(env, d) >= 0, "Last created FID "DFID
1314 "Next FID "DFID"\n", PFID(&d->opd_pre_last_created_fid),
1315 PFID(&d->opd_pre_used_fid));
1319 * - preallocation is done
1320 * - no free space expected soon
1321 * - can't connect to OST for too long (obd_timeout)
1322 * - OST can allocate fid sequence.
1324 while ((rc = d->opd_pre_status) == 0 || rc == -ENOSPC ||
1325 rc == -ENODEV || rc == -EAGAIN || rc == -ENOTCONN) {
1328 * increase number of precreations
1330 precreated = osp_objs_precreated(env, d);
1331 if (d->opd_pre_create_count < d->opd_pre_max_create_count &&
1332 d->opd_pre_create_slow == 0 &&
1333 precreated <= (d->opd_pre_create_count / 4 + 1)) {
1334 spin_lock(&d->opd_pre_lock);
1335 d->opd_pre_create_slow = 1;
1336 d->opd_pre_create_count *= 2;
1337 spin_unlock(&d->opd_pre_lock);
1340 spin_lock(&d->opd_pre_lock);
1341 precreated = osp_objs_precreated(env, d);
1342 if (precreated > d->opd_pre_reserved &&
1343 !d->opd_pre_recovering) {
1344 d->opd_pre_reserved++;
1345 spin_unlock(&d->opd_pre_lock);
1348 /* XXX: don't wake up if precreation is in progress */
1349 if (osp_precreate_near_empty_nolock(env, d) &&
1350 !osp_precreate_end_seq_nolock(env, d))
1351 wake_up(&d->opd_pre_waitq);
1355 spin_unlock(&d->opd_pre_lock);
1358 * all precreated objects have been used and no-space
1359 * status leave us no chance to succeed very soon
1360 * but if there is destroy in progress, then we should
1361 * wait till that is done - some space might be released
1363 if (unlikely(rc == -ENOSPC)) {
1364 if (d->opd_syn_changes) {
1365 /* force local commit to release space */
1366 dt_commit_async(env, d->opd_storage);
1368 if (d->opd_syn_rpc_in_progress) {
1369 /* just wait till destroys are done */
1370 /* see l_wait_even() few lines below */
1372 if (d->opd_syn_changes +
1373 d->opd_syn_rpc_in_progress == 0) {
1374 /* no hope for free space */
1379 /* XXX: don't wake up if precreation is in progress */
1380 wake_up(&d->opd_pre_waitq);
1382 lwi = LWI_TIMEOUT(expire - cfs_time_current(),
1383 osp_precreate_timeout_condition, d);
1384 if (cfs_time_aftereq(cfs_time_current(), expire)) {
1389 l_wait_event(d->opd_pre_user_waitq,
1390 osp_precreate_ready_condition(env, d), &lwi);
1397 * Get a FID from precreation pool
1399 * The function is a companion for osp_precreate_reserve() - it assigns
1400 * a specific FID from the precreate. The function should be called only
1401 * if the call to osp_precreate_reserve() was successful. The function
1402 * updates a local storage to remember the highest object ID referenced
1403 * by the node in the given sequence.
1405 * A very importan details: this is supposed to be called once the
1406 * transaction is started, so on-disk update will be atomic with the
1407 * data (like LOVEA) refering this object. Then the object won't be leaked:
1408 * either it's referenced by the committed transaction or it's a subject
1409 * to the orphan cleanup procedure.
1411 * \param[in] env LU environment provided by the caller
1412 * \param[in] d OSP device
1413 * \param[out] fid generated FID
1415 * \retval 0 on success
1416 * \retval negative negated errno on error
1418 int osp_precreate_get_fid(const struct lu_env *env, struct osp_device *d,
1421 /* grab next id from the pool */
1422 spin_lock(&d->opd_pre_lock);
1424 LASSERTF(osp_fid_diff(&d->opd_pre_used_fid,
1425 &d->opd_pre_last_created_fid) < 0,
1426 "next fid "DFID" last created fid "DFID"\n",
1427 PFID(&d->opd_pre_used_fid),
1428 PFID(&d->opd_pre_last_created_fid));
1430 d->opd_pre_used_fid.f_oid++;
1431 memcpy(fid, &d->opd_pre_used_fid, sizeof(*fid));
1432 d->opd_pre_reserved--;
1434 * last_used_id must be changed along with getting new id otherwise
1435 * we might miscalculate gap causing object loss or leak
1437 osp_update_last_fid(d, fid);
1438 spin_unlock(&d->opd_pre_lock);
1441 * probably main thread suspended orphan cleanup till
1442 * all reservations are released, see comment in
1443 * osp_precreate_thread() just before orphan cleanup
1445 if (unlikely(d->opd_pre_reserved == 0 && d->opd_pre_status))
1446 wake_up(&d->opd_pre_waitq);
1452 * Set size regular attribute on an object
1454 * When a striping is created late, it's possible that size is already
1455 * initialized on the file. Then the new striping should inherit size
1456 * from the file. The function sets size on the object using the regular
1457 * protocol (OST_PUNCH).
1458 * XXX: should be re-implemented using OUT ?
1460 * \param[in] env LU environment provided by the caller
1461 * \param[in] dt object
1462 * \param[in] size size to set.
1464 * \retval 0 on success
1465 * \retval negative negated errno on error
1467 int osp_object_truncate(const struct lu_env *env, struct dt_object *dt,
1470 struct osp_device *d = lu2osp_dev(dt->do_lu.lo_dev);
1471 struct ptlrpc_request *req = NULL;
1472 struct obd_import *imp;
1473 struct ost_body *body;
1474 struct obdo *oa = NULL;
1479 imp = d->opd_obd->u.cli.cl_import;
1482 req = ptlrpc_request_alloc(imp, &RQF_OST_PUNCH);
1486 /* XXX: capa support? */
1487 /* osc_set_capa_size(req, &RMF_CAPA1, capa); */
1488 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
1490 ptlrpc_request_free(req);
1495 * XXX: decide how do we do here with resend
1496 * if we don't resend, then client may see wrong file size
1497 * if we do resend, then MDS thread can get stuck for quite long
1498 * and if we don't resend, then client will also get -EWOULDBLOCK !!
1499 * (see LU-7975 and sanity/test_27F use cases)
1500 * but let's decide not to resend/delay this truncate request to OST
1501 * and allow Client to decide to resend, in a less agressive way from
1502 * after_reply(), by returning -EINPROGRESS instead of
1503 * -EAGAIN/-EWOULDBLOCK upon return from ptlrpc_queue_wait() at the
1504 * end of this routine
1506 req->rq_no_resend = req->rq_no_delay = 1;
1508 req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1509 ptlrpc_at_set_req_timeout(req);
1513 GOTO(out, rc = -ENOMEM);
1515 rc = fid_to_ostid(lu_object_fid(&dt->do_lu), &oa->o_oi);
1518 oa->o_blocks = OBD_OBJECT_EOF;
1519 oa->o_valid = OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
1520 OBD_MD_FLID | OBD_MD_FLGROUP;
1522 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
1524 lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
1526 /* XXX: capa support? */
1527 /* osc_pack_capa(req, body, capa); */
1529 ptlrpc_request_set_replen(req);
1531 rc = ptlrpc_queue_wait(req);
1533 /* -EWOULDBLOCK/-EAGAIN means OST is unreachable at the moment
1534 * since we have decided not to resend/delay, but this could
1535 * lead to wrong size to be seen at Client side and even process
1536 * trying to open to exit/fail if not itself handling -EAGAIN.
1537 * So it should be better to return -EINPROGRESS instead and
1538 * leave the decision to resend at Client side in after_reply()
1540 if (rc == -EWOULDBLOCK) {
1542 CDEBUG(D_HA, "returning -EINPROGRESS instead of "
1543 "-EWOULDBLOCK/-EAGAIN to allow Client to "
1546 CERROR("can't punch object: %d\n", rc);
1550 ptlrpc_req_finished(req);
1557 * Initialize precreation functionality of OSP
1559 * Prepares all the internal structures and starts the precreate thread
1561 * \param[in] d OSP device
1563 * \retval 0 on success
1564 * \retval negative negated errno on error
1566 int osp_init_precreate(struct osp_device *d)
1568 struct l_wait_info lwi = { 0 };
1569 struct task_struct *task;
1573 OBD_ALLOC_PTR(d->opd_pre);
1574 if (d->opd_pre == NULL)
1577 /* initially precreation isn't ready */
1578 d->opd_pre_status = -EAGAIN;
1579 fid_zero(&d->opd_pre_used_fid);
1580 d->opd_pre_used_fid.f_oid = 1;
1581 fid_zero(&d->opd_pre_last_created_fid);
1582 d->opd_pre_last_created_fid.f_oid = 1;
1583 d->opd_pre_reserved = 0;
1584 d->opd_got_disconnected = 1;
1585 d->opd_pre_create_slow = 0;
1586 d->opd_pre_create_count = OST_MIN_PRECREATE;
1587 d->opd_pre_min_create_count = OST_MIN_PRECREATE;
1588 d->opd_pre_max_create_count = OST_MAX_PRECREATE;
1590 spin_lock_init(&d->opd_pre_lock);
1591 init_waitqueue_head(&d->opd_pre_waitq);
1592 init_waitqueue_head(&d->opd_pre_user_waitq);
1593 init_waitqueue_head(&d->opd_pre_thread.t_ctl_waitq);
1596 * Initialize statfs-related things
1598 d->opd_statfs_maxage = 5; /* default update interval */
1599 d->opd_statfs_fresh_till = cfs_time_shift(-1000);
1600 CDEBUG(D_OTHER, "current %llu, fresh till %llu\n",
1601 (unsigned long long)cfs_time_current(),
1602 (unsigned long long)d->opd_statfs_fresh_till);
1603 cfs_timer_init(&d->opd_statfs_timer, osp_statfs_timer_cb, d);
1606 * start thread handling precreation and statfs updates
1608 task = kthread_run(osp_precreate_thread, d,
1609 "osp-pre-%u-%u", d->opd_index, d->opd_group);
1611 CERROR("can't start precreate thread %ld\n", PTR_ERR(task));
1612 RETURN(PTR_ERR(task));
1615 l_wait_event(d->opd_pre_thread.t_ctl_waitq,
1616 osp_precreate_running(d) || osp_precreate_stopped(d),
1623 * Finish precreate functionality of OSP
1626 * Asks all the activity (the thread, update timer) to stop, then
1627 * wait till that is done.
1629 * \param[in] d OSP device
1631 void osp_precreate_fini(struct osp_device *d)
1633 struct ptlrpc_thread *thread;
1637 cfs_timer_disarm(&d->opd_statfs_timer);
1639 if (d->opd_pre == NULL)
1642 thread = &d->opd_pre_thread;
1644 thread->t_flags = SVC_STOPPING;
1645 wake_up(&d->opd_pre_waitq);
1647 wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
1649 OBD_FREE_PTR(d->opd_pre);