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LU-2697 osp: remove trailing newline on thread names
[fs/lustre-release.git] / lustre / osp / osp_precreate.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
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.
9  *
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).
15  *
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
19  *
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
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2012, Intel Corporation.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  *
36  * lustre/osp/osp_sync.c
37  *
38  * Lustre OST Proxy Device
39  *
40  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
41  * Author: Mikhail Pershin <mike.pershin@intel.com>
42  * Author: Di Wang <di.wang@intel.com>
43  */
44
45 #ifndef EXPORT_SYMTAB
46 # define EXPORT_SYMTAB
47 #endif
48 #define DEBUG_SUBSYSTEM S_MDS
49
50 #include "osp_internal.h"
51
52 /*
53  * there are two specific states to take care about:
54  *
55  * = import is disconnected =
56  *
57  * = import is inactive =
58  *   in this case osp_declare_object_create() returns an error
59  *
60  */
61
62 /*
63  * statfs
64  */
65 static inline int osp_statfs_need_update(struct osp_device *d)
66 {
67         return !cfs_time_before(cfs_time_current(),
68                                 d->opd_statfs_fresh_till);
69 }
70
71 static void osp_statfs_timer_cb(unsigned long _d)
72 {
73         struct osp_device *d = (struct osp_device *) _d;
74
75         LASSERT(d);
76         cfs_waitq_signal(&d->opd_pre_waitq);
77 }
78
79 static int osp_statfs_interpret(const struct lu_env *env,
80                                 struct ptlrpc_request *req,
81                                 union ptlrpc_async_args *aa, int rc)
82 {
83         struct obd_import       *imp = req->rq_import;
84         struct obd_statfs       *msfs;
85         struct osp_device       *d;
86
87         ENTRY;
88
89         aa = ptlrpc_req_async_args(req);
90         d = aa->pointer_arg[0];
91         LASSERT(d);
92
93         if (rc != 0)
94                 GOTO(out, rc);
95
96         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
97         if (msfs == NULL)
98                 GOTO(out, rc = -EPROTO);
99
100         d->opd_statfs = *msfs;
101
102         osp_pre_update_status(d, rc);
103
104         /* schedule next update */
105         d->opd_statfs_fresh_till = cfs_time_shift(d->opd_statfs_maxage);
106         cfs_timer_arm(&d->opd_statfs_timer, d->opd_statfs_fresh_till);
107         d->opd_statfs_update_in_progress = 0;
108
109         CDEBUG(D_CACHE, "updated statfs %p\n", d);
110
111         RETURN(0);
112 out:
113         /* couldn't update statfs, try again as soon as possible */
114         cfs_waitq_signal(&d->opd_pre_waitq);
115         if (req->rq_import_generation == imp->imp_generation)
116                 CDEBUG(D_CACHE, "%s: couldn't update statfs: rc = %d\n",
117                        d->opd_obd->obd_name, rc);
118         RETURN(rc);
119 }
120
121 static int osp_statfs_update(struct osp_device *d)
122 {
123         struct ptlrpc_request   *req;
124         struct obd_import       *imp;
125         union ptlrpc_async_args *aa;
126         int                      rc;
127
128         ENTRY;
129
130         CDEBUG(D_CACHE, "going to update statfs\n");
131
132         imp = d->opd_obd->u.cli.cl_import;
133         LASSERT(imp);
134
135         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
136         if (req == NULL)
137                 RETURN(-ENOMEM);
138
139         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
140         if (rc) {
141                 ptlrpc_request_free(req);
142                 RETURN(rc);
143         }
144         ptlrpc_request_set_replen(req);
145         req->rq_request_portal = OST_CREATE_PORTAL;
146         ptlrpc_at_set_req_timeout(req);
147
148         req->rq_interpret_reply = (ptlrpc_interpterer_t)osp_statfs_interpret;
149         aa = ptlrpc_req_async_args(req);
150         aa->pointer_arg[0] = d;
151
152         /*
153          * no updates till reply
154          */
155         cfs_timer_disarm(&d->opd_statfs_timer);
156         d->opd_statfs_fresh_till = cfs_time_shift(obd_timeout * 1000);
157         d->opd_statfs_update_in_progress = 1;
158
159         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
160
161         RETURN(0);
162 }
163
164 /*
165  * XXX: there might be a case where removed object(s) do not add free
166  * space (empty object). if the number of such deletions is high, then
167  * we can start to update statfs too often - a rpc storm
168  * TODO: some throttling is needed
169  */
170 void osp_statfs_need_now(struct osp_device *d)
171 {
172         if (!d->opd_statfs_update_in_progress) {
173                 /*
174                  * if current status is -ENOSPC (lack of free space on OST)
175                  * then we should poll OST immediately once object destroy
176                  * is replied
177                  */
178                 d->opd_statfs_fresh_till = cfs_time_shift(-1);
179                 cfs_timer_disarm(&d->opd_statfs_timer);
180                 cfs_waitq_signal(&d->opd_pre_waitq);
181         }
182 }
183
184
185 /*
186  * OSP tries to maintain pool of available objects so that calls to create
187  * objects don't block most of time
188  *
189  * each time OSP gets connected to OST, we should start from precreation cleanup
190  */
191 static inline int osp_precreate_running(struct osp_device *d)
192 {
193         return !!(d->opd_pre_thread.t_flags & SVC_RUNNING);
194 }
195
196 static inline int osp_precreate_stopped(struct osp_device *d)
197 {
198         return !!(d->opd_pre_thread.t_flags & SVC_STOPPED);
199 }
200
201 static inline int osp_objs_precreated(const struct lu_env *env,
202                                       struct osp_device *osp)
203 {
204         struct lu_fid *fid1 = &osp->opd_pre_last_created_fid;
205         struct lu_fid *fid2 = &osp->opd_pre_used_fid;
206
207         LASSERTF(fid_seq(fid1) == fid_seq(fid2),
208                  "Created fid"DFID" Next fid "DFID"\n", PFID(fid1), PFID(fid2));
209
210         if (fid_is_idif(fid1)) {
211                 struct ost_id *oi1 = &osp_env_info(env)->osi_oi;
212                 struct ost_id *oi2 = &osp_env_info(env)->osi_oi2;
213
214                 LASSERT(fid_is_idif(fid1) && fid_is_idif(fid2));
215                 ostid_idif_pack(fid1, oi1);
216                 ostid_idif_pack(fid2, oi2);
217                 LASSERT(oi1->oi_id >= oi2->oi_id);
218
219                 return oi1->oi_id - oi2->oi_id;
220         }
221
222         return fid_oid(fid1) - fid_oid(fid2);
223 }
224
225 static inline int osp_precreate_near_empty_nolock(const struct lu_env *env,
226                                                   struct osp_device *d)
227 {
228         int window = osp_objs_precreated(env, d);
229
230         /* don't consider new precreation till OST is healty and
231          * has free space */
232         return ((window - d->opd_pre_reserved < d->opd_pre_grow_count / 2) &&
233                 (d->opd_pre_status == 0));
234 }
235
236 static inline int osp_precreate_near_empty(const struct lu_env *env,
237                                            struct osp_device *d)
238 {
239         int rc;
240
241         /* XXX: do we really need locking here? */
242         spin_lock(&d->opd_pre_lock);
243         rc = osp_precreate_near_empty_nolock(env, d);
244         spin_unlock(&d->opd_pre_lock);
245         return rc;
246 }
247
248 static inline int osp_create_end_seq(const struct lu_env *env,
249                                      struct osp_device *osp)
250 {
251         struct lu_fid *fid = &osp->opd_pre_used_fid;
252         int rc;
253
254         spin_lock(&osp->opd_pre_lock);
255         rc = osp_fid_end_seq(env, fid);
256         spin_unlock(&osp->opd_pre_lock);
257         return rc;
258 }
259
260 /**
261  * Write fid into last_oid/last_seq file.
262  **/
263 int osp_write_last_oid_seq_files(struct lu_env *env, struct osp_device *osp,
264                                  struct lu_fid *fid, int sync)
265 {
266         struct osp_thread_info  *oti = osp_env_info(env);
267         struct lu_buf      *lb_oid = &oti->osi_lb;
268         struct lu_buf      *lb_oseq = &oti->osi_lb2;
269         loff_t             oid_off;
270         loff_t             oseq_off;
271         struct thandle    *th;
272         int                   rc;
273         ENTRY;
274
275         /* Note: through f_oid is only 32bits, it will also write
276          * 64 bits for oid to keep compatiblity with the previous
277          * version. */
278         lb_oid->lb_buf = &fid->f_oid;
279         lb_oid->lb_len = sizeof(obd_id);
280         oid_off = sizeof(obd_id) * osp->opd_index;
281
282         lb_oseq->lb_buf = &fid->f_seq;
283         lb_oseq->lb_len = sizeof(obd_id);
284         oseq_off = sizeof(obd_id) * osp->opd_index;
285
286         th = dt_trans_create(env, osp->opd_storage);
287         if (IS_ERR(th))
288                 RETURN(PTR_ERR(th));
289
290         th->th_sync |= sync;
291         rc = dt_declare_record_write(env, osp->opd_last_used_oid_file,
292                                      lb_oid->lb_len, oid_off, th);
293         if (rc != 0)
294                 GOTO(out, rc);
295
296         rc = dt_declare_record_write(env, osp->opd_last_used_seq_file,
297                                      lb_oseq->lb_len, oseq_off, th);
298         if (rc != 0)
299                 GOTO(out, rc);
300
301         rc = dt_trans_start_local(env, osp->opd_storage, th);
302         if (rc != 0)
303                 GOTO(out, rc);
304
305         rc = dt_record_write(env, osp->opd_last_used_oid_file, lb_oid,
306                              &oid_off, th);
307         if (rc != 0) {
308                 CERROR("%s: can not write to last seq file: rc = %d\n",
309                         osp->opd_obd->obd_name, rc);
310                 GOTO(out, rc);
311         }
312         rc = dt_record_write(env, osp->opd_last_used_seq_file, lb_oseq,
313                              &oseq_off, th);
314         if (rc) {
315                 CERROR("%s: can not write to last seq file: rc = %d\n",
316                         osp->opd_obd->obd_name, rc);
317                 GOTO(out, rc);
318         }
319 out:
320         dt_trans_stop(env, osp->opd_storage, th);
321         RETURN(rc);
322 }
323
324 int osp_precreate_rollover_new_seq(struct lu_env *env, struct osp_device *osp)
325 {
326         struct lu_fid   *fid = &osp_env_info(env)->osi_fid;
327         struct lu_fid   *last_fid = &osp->opd_last_used_fid;
328         int             rc;
329         ENTRY;
330
331         rc = seq_client_get_seq(env, osp->opd_obd->u.cli.cl_seq, &fid->f_seq);
332         if (rc != 0) {
333                 CERROR("%s: alloc fid error: rc = %d\n",
334                        osp->opd_obd->obd_name, rc);
335                 RETURN(rc);
336         }
337
338         fid->f_oid = 1;
339         fid->f_ver = 0;
340         LASSERTF(fid_seq(fid) != fid_seq(last_fid),
341                  "fid "DFID", last_fid "DFID"\n", PFID(fid),
342                  PFID(last_fid));
343
344         rc = osp_write_last_oid_seq_files(env, osp, fid, 1);
345         if (rc != 0) {
346                 CERROR("%s: Can not update oid/seq file: rc = %d\n",
347                        osp->opd_obd->obd_name, rc);
348                 RETURN(rc);
349         }
350
351         LCONSOLE_INFO("%s: update sequence from "LPX64" to "LPX64"\n",
352                       osp->opd_obd->obd_name, fid_seq(last_fid),
353                       fid_seq(fid));
354         /* Update last_xxx to the new seq */
355         spin_lock(&osp->opd_pre_lock);
356         osp->opd_last_used_fid = *fid;
357         osp->opd_gap_start_fid = *fid;
358         osp->opd_pre_used_fid = *fid;
359         osp->opd_pre_last_created_fid = *fid;
360         spin_unlock(&osp->opd_pre_lock);
361
362         RETURN(rc);
363 }
364
365 /**
366  * alloc fids for precreation.
367  * rc = 0 Success, @grow is the count of real allocation.
368  * rc = 1 Current seq is used up.
369  * rc < 0 Other error.
370  **/
371 static int osp_precreate_fids(const struct lu_env *env, struct osp_device *osp,
372                               struct lu_fid *fid, int *grow)
373 {
374         struct osp_thread_info  *osi = osp_env_info(env);
375         __u64                   end;
376         int                     i = 0;
377
378         if (fid_is_idif(fid)) {
379                 struct lu_fid   *last_fid;
380                 struct ost_id   *oi = &osi->osi_oi;
381
382                 spin_lock(&osp->opd_pre_lock);
383                 last_fid = &osp->opd_pre_last_created_fid;
384                 ostid_idif_pack(last_fid, oi);
385                 end = min(oi->oi_id + *grow, IDIF_MAX_OID);
386                 *grow = end - oi->oi_id;
387                 oi->oi_id += *grow;
388                 spin_unlock(&osp->opd_pre_lock);
389
390                 if (*grow == 0)
391                         return 1;
392
393                 ostid_idif_unpack(oi, fid, osp->opd_index);
394                 return 0;
395         }
396
397         spin_lock(&osp->opd_pre_lock);
398         *fid = osp->opd_pre_last_created_fid;
399         end = fid->f_oid;
400         end = min((end + *grow), (__u64)LUSTRE_DATA_SEQ_MAX_WIDTH);
401         *grow = end - fid->f_oid;
402         fid->f_oid += end - fid->f_oid;
403         spin_unlock(&osp->opd_pre_lock);
404
405         CDEBUG(D_INFO, "Expect %d, actual %d ["DFID" -- "DFID"]\n",
406                *grow, i, PFID(fid), PFID(&osp->opd_pre_last_created_fid));
407
408         return *grow > 0 ? 0 : 1;
409 }
410
411 static int osp_precreate_send(const struct lu_env *env, struct osp_device *d)
412 {
413         struct osp_thread_info  *oti = osp_env_info(env);
414         struct ptlrpc_request   *req;
415         struct obd_import       *imp;
416         struct ost_body         *body;
417         int                      rc, grow, diff;
418         struct lu_fid           *fid = &oti->osi_fid;
419         ENTRY;
420
421         /* don't precreate new objects till OST healthy and has free space */
422         if (unlikely(d->opd_pre_status)) {
423                 CDEBUG(D_INFO, "%s: don't send new precreate: rc = %d\n",
424                        d->opd_obd->obd_name, d->opd_pre_status);
425                 RETURN(0);
426         }
427
428         /*
429          * if not connection/initialization is compeleted, ignore
430          */
431         imp = d->opd_obd->u.cli.cl_import;
432         LASSERT(imp);
433
434         req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
435         if (req == NULL)
436                 RETURN(-ENOMEM);
437         req->rq_request_portal = OST_CREATE_PORTAL;
438         /* we should not resend create request - anyway we will have delorphan
439          * and kill these objects */
440         req->rq_no_delay = req->rq_no_resend = 1;
441
442         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
443         if (rc) {
444                 ptlrpc_request_free(req);
445                 RETURN(rc);
446         }
447
448         spin_lock(&d->opd_pre_lock);
449         if (d->opd_pre_grow_count > d->opd_pre_max_grow_count / 2)
450                 d->opd_pre_grow_count = d->opd_pre_max_grow_count / 2;
451         grow = d->opd_pre_grow_count;
452         spin_unlock(&d->opd_pre_lock);
453
454         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
455         LASSERT(body);
456
457         rc = osp_precreate_fids(env, d, fid, &grow);
458         if (rc == 1) {
459                 /* Current seq has been used up*/
460                 if (!osp_is_fid_client(d)) {
461                         osp_pre_update_status(d, -ENOSPC);
462                         rc = -ENOSPC;
463                 }
464                 cfs_waitq_signal(&d->opd_pre_waitq);
465                 GOTO(out_req, rc);
466         }
467
468         if (!osp_is_fid_client(d)) {
469                 /* Non-FID client will always send seq 0 because of
470                  * compatiblity */
471                 LASSERTF(fid_is_idif(fid), "Invalid fid "DFID"\n", PFID(fid));
472                 fid->f_seq = 0;
473         }
474
475         ostid_fid_pack(fid, &body->oa.o_oi);
476         body->oa.o_valid = OBD_MD_FLGROUP;
477
478         ptlrpc_request_set_replen(req);
479
480         rc = ptlrpc_queue_wait(req);
481         if (rc) {
482                 CERROR("%s: can't precreate: rc = %d\n", d->opd_obd->obd_name,
483                        rc);
484                 GOTO(out_req, rc);
485         }
486         LASSERT(req->rq_transno == 0);
487
488         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
489         if (body == NULL)
490                 GOTO(out_req, rc = -EPROTO);
491
492         fid_ostid_unpack(fid, &body->oa.o_oi, d->opd_index);
493         LASSERTF(lu_fid_diff(fid, &d->opd_pre_used_fid) > 0,
494                  "reply fid "DFID" pre used fid "DFID"\n", PFID(fid),
495                  PFID(&d->opd_pre_used_fid));
496
497         CDEBUG(D_HA, "%s: new last_created "DFID"\n", d->opd_obd->obd_name,
498                PFID(fid));
499
500         diff = lu_fid_diff(fid, &d->opd_pre_last_created_fid);
501
502         spin_lock(&d->opd_pre_lock);
503         if (diff < grow) {
504                 /* the OST has not managed to create all the
505                  * objects we asked for */
506                 d->opd_pre_grow_count = max(diff, OST_MIN_PRECREATE);
507                 d->opd_pre_grow_slow = 1;
508         } else {
509                 /* the OST is able to keep up with the work,
510                  * we could consider increasing grow_count
511                  * next time if needed */
512                 d->opd_pre_grow_slow = 0;
513         }
514
515         d->opd_pre_last_created_fid = *fid;
516         spin_unlock(&d->opd_pre_lock);
517
518         CDEBUG(D_OTHER, "current precreated pool: "DFID"-"DFID"\n",
519                PFID(&d->opd_pre_used_fid), PFID(&d->opd_pre_last_created_fid));
520 out_req:
521         /* now we can wakeup all users awaiting for objects */
522         osp_pre_update_status(d, rc);
523         cfs_waitq_signal(&d->opd_pre_user_waitq);
524
525         ptlrpc_req_finished(req);
526         RETURN(rc);
527 }
528
529 static int osp_get_lastfid_from_ost(struct osp_device *d)
530 {
531         struct ptlrpc_request   *req = NULL;
532         struct obd_import       *imp;
533         struct lu_fid           *last_fid = &d->opd_last_used_fid;
534         char                    *tmp;
535         int                     rc;
536         ENTRY;
537
538         imp = d->opd_obd->u.cli.cl_import;
539         LASSERT(imp);
540
541         req = ptlrpc_request_alloc(imp, &RQF_OST_GET_INFO_LAST_FID);
542         if (req == NULL)
543                 RETURN(-ENOMEM);
544
545         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
546                              RCL_CLIENT, sizeof(KEY_LAST_FID));
547
548         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
549                              RCL_CLIENT, sizeof(*last_fid));
550
551         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
552         if (rc) {
553                 ptlrpc_request_free(req);
554                 RETURN(rc);
555         }
556
557         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
558         memcpy(tmp, KEY_LAST_FID, sizeof(KEY_LAST_FID));
559
560         req->rq_no_delay = req->rq_no_resend = 1;
561         fid_cpu_to_le(last_fid, last_fid);
562         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
563         memcpy(tmp, last_fid, sizeof(*last_fid));
564         ptlrpc_request_set_replen(req);
565
566         rc = ptlrpc_queue_wait(req);
567         if (rc) {
568                 /* bad-bad OST.. let sysadm sort this out */
569                 if (rc == -ENOTSUPP) {
570                         CERROR("%s: server does not support FID: rc = %d\n",
571                                d->opd_obd->obd_name, -ENOTSUPP);
572                 }
573                 ptlrpc_set_import_active(imp, 0);
574                 GOTO(out, rc);
575         }
576
577         last_fid = req_capsule_server_get(&req->rq_pill, &RMF_FID);
578         if (last_fid == NULL || !fid_is_sane(last_fid)) {
579                 CERROR("%s: Got insane last_fid "DFID"\n",
580                        d->opd_obd->obd_name, PFID(last_fid));
581                 GOTO(out, rc = -EPROTO);
582         }
583
584         /* Only update the last used fid, if the OST has objects for
585          * this sequence, i.e. fid_oid > 0 */
586         if (fid_oid(last_fid) > 0)
587                 d->opd_last_used_fid = *last_fid;
588
589         CDEBUG(D_HA, "%s: Got insane last_fid "DFID"\n", d->opd_obd->obd_name,
590                PFID(last_fid));
591
592 out:
593         ptlrpc_req_finished(req);
594         RETURN(rc);
595 }
596
597 /**
598  * asks OST to clean precreate orphans
599  * and gets next id for new objects
600  */
601 static int osp_precreate_cleanup_orphans(struct lu_env *env,
602                                          struct osp_device *d)
603 {
604         struct osp_thread_info  *osi = osp_env_info(env);
605         struct lu_fid           *last_fid = &osi->osi_fid;
606         struct ptlrpc_request   *req = NULL;
607         struct obd_import       *imp;
608         struct ost_body         *body;
609         struct l_wait_info       lwi = { 0 };
610         int                      update_status = 0;
611         int                      rc;
612         int                      diff;
613
614         ENTRY;
615
616         /*
617          * wait for local recovery to finish, so we can cleanup orphans
618          * orphans are all objects since "last used" (assigned), but
619          * there might be objects reserved and in some cases they won't
620          * be used. we can't cleanup them till we're sure they won't be
621          * used. also can't we allow new reservations because they may
622          * end up getting orphans being cleaned up below. so we block
623          * new reservations and wait till all reserved objects either
624          * user or released.
625          */
626         spin_lock(&d->opd_pre_lock);
627         d->opd_pre_recovering = 1;
628         spin_unlock(&d->opd_pre_lock);
629         /*
630          * The locking above makes sure the opd_pre_reserved check below will
631          * catch all osp_precreate_reserve() calls who find
632          * "!opd_pre_recovering".
633          */
634         l_wait_event(d->opd_pre_waitq,
635                      (!d->opd_pre_reserved && d->opd_recovery_completed) ||
636                      !osp_precreate_running(d) || d->opd_got_disconnected,
637                      &lwi);
638         if (!osp_precreate_running(d) || d->opd_got_disconnected)
639                 GOTO(out, rc = -EAGAIN);
640
641         CDEBUG(D_HA, "%s: going to cleanup orphans since "DFID"\n",
642                d->opd_obd->obd_name, PFID(&d->opd_last_used_fid));
643
644         *last_fid = d->opd_last_used_fid;
645         /* The OSP should already get the valid seq now */
646         LASSERT(!fid_is_zero(last_fid));
647         if (fid_oid(&d->opd_last_used_fid) < 2) {
648                 /* lastfid looks strange... ask OST */
649                 rc = osp_get_lastfid_from_ost(d);
650                 if (rc)
651                         GOTO(out, rc);
652         }
653
654         imp = d->opd_obd->u.cli.cl_import;
655         LASSERT(imp);
656
657         req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
658         if (req == NULL)
659                 GOTO(out, rc = -ENOMEM);
660
661         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
662         if (rc) {
663                 ptlrpc_request_free(req);
664                 req = NULL;
665                 GOTO(out, rc);
666         }
667
668         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
669         if (body == NULL)
670                 GOTO(out, rc = -EPROTO);
671
672         body->oa.o_flags = OBD_FL_DELORPHAN;
673         body->oa.o_valid = OBD_MD_FLFLAGS | OBD_MD_FLGROUP;
674         if (osp_is_fid_client(d))
675                 body->oa.o_seq = fid_seq(&d->opd_last_used_fid);
676         else
677                 body->oa.o_seq = 0;
678         /* remove from NEXT after used one */
679         body->oa.o_id = fid_oid(&d->opd_last_used_fid);
680
681         ptlrpc_request_set_replen(req);
682
683         /* Don't resend the delorphan req */
684         req->rq_no_resend = req->rq_no_delay = 1;
685
686         rc = ptlrpc_queue_wait(req);
687         if (rc) {
688                 update_status = 1;
689                 GOTO(out, rc);
690         }
691
692         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
693         if (body == NULL)
694                 GOTO(out, rc = -EPROTO);
695
696         /*
697          * OST provides us with id new pool starts from in body->oa.o_id
698          */
699         fid_ostid_unpack(last_fid, &body->oa.o_oi, d->opd_index);
700         CDEBUG(D_INFO, "%s: last_fid "DFID" server last fid "DFID"\n",
701                d->opd_obd->obd_name, PFID(&d->opd_last_used_fid),
702                PFID(last_fid));
703
704         spin_lock(&d->opd_pre_lock);
705         diff = lu_fid_diff(&d->opd_last_used_fid, last_fid);
706         if (diff > 0) {
707                 d->opd_pre_grow_count = OST_MIN_PRECREATE + diff;
708                 d->opd_pre_last_created_fid = d->opd_last_used_fid;
709         } else {
710                 d->opd_pre_grow_count = OST_MIN_PRECREATE;
711                 d->opd_pre_last_created_fid = *last_fid;
712         }
713         /*
714          * This empties the pre-creation pool and effectively blocks any new
715          * reservations.
716          */
717         LASSERT(fid_oid(&d->opd_pre_last_created_fid) <=
718                 LUSTRE_DATA_SEQ_MAX_WIDTH);
719         d->opd_pre_used_fid = d->opd_pre_last_created_fid;
720         d->opd_pre_grow_slow = 0;
721         spin_unlock(&d->opd_pre_lock);
722
723         CDEBUG(D_HA, "%s: Got last_id "DFID" from OST, last_created "DFID
724                "last_used is "DFID"\n", d->opd_obd->obd_name, PFID(last_fid),
725                PFID(&d->opd_pre_last_created_fid), PFID(&d->opd_last_used_fid));
726 out:
727         if (req)
728                 ptlrpc_req_finished(req);
729
730         d->opd_pre_recovering = 0;
731
732         /*
733          * If rc is zero, the pre-creation window should have been emptied.
734          * Since waking up the herd would be useless without pre-created
735          * objects, we defer the signal to osp_precreate_send() in that case.
736          */
737         if (rc != 0) {
738                 if (update_status) {
739                         CERROR("%s: cannot cleanup orphans: rc = %d\n",
740                                d->opd_obd->obd_name, rc);
741                         /* we can't proceed from here, OST seem to
742                          * be in a bad shape, better to wait for
743                          * a new instance of the server and repeat
744                          * from the beginning. notify possible waiters
745                          * this OSP isn't quite functional yet */
746                         osp_pre_update_status(d, rc);
747                 } else {
748                         cfs_waitq_signal(&d->opd_pre_user_waitq);
749                 }
750         }
751
752         RETURN(rc);
753 }
754
755 /*
756  * the function updates current precreation status used: functional or not
757  *
758  * rc is a last code from the transport, rc == 0 meaning transport works
759  * well and users of lod can use objects from this OSP
760  *
761  * the status depends on current usage of OST
762  */
763 void osp_pre_update_status(struct osp_device *d, int rc)
764 {
765         struct obd_statfs       *msfs = &d->opd_statfs;
766         int                      old = d->opd_pre_status;
767         __u64                    used;
768
769         d->opd_pre_status = rc;
770         if (rc)
771                 goto out;
772
773         /* Add a bit of hysteresis so this flag isn't continually flapping,
774          * and ensure that new files don't get extremely fragmented due to
775          * only a small amount of available space in the filesystem.
776          * We want to set the NOSPC flag when there is less than ~0.1% free
777          * and clear it when there is at least ~0.2% free space, so:
778          *                   avail < ~0.1% max          max = avail + used
779          *            1025 * avail < avail + used       used = blocks - free
780          *            1024 * avail < used
781          *            1024 * avail < blocks - free
782          *                   avail < ((blocks - free) >> 10)
783          *
784          * On very large disk, say 16TB 0.1% will be 16 GB. We don't want to
785          * lose that amount of space so in those cases we report no space left
786          * if their is less than 1 GB left.                             */
787         if (likely(msfs->os_type)) {
788                 used = min_t(__u64, (msfs->os_blocks - msfs->os_bfree) >> 10,
789                                     1 << 30);
790                 if ((msfs->os_ffree < 32) || (msfs->os_bavail < used)) {
791                         d->opd_pre_status = -ENOSPC;
792                         if (old != -ENOSPC)
793                                 CDEBUG(D_INFO, "%s: status: "LPU64" blocks, "
794                                        LPU64" free, "LPU64" used, "LPU64" "
795                                        "avail -> %d: rc = %d\n",
796                                        d->opd_obd->obd_name, msfs->os_blocks,
797                                        msfs->os_bfree, used, msfs->os_bavail,
798                                        d->opd_pre_status, rc);
799                         CDEBUG(D_INFO,
800                                "non-commited changes: %lu, in progress: %u\n",
801                                d->opd_syn_changes, d->opd_syn_rpc_in_progress);
802                 } else if (old == -ENOSPC) {
803                         d->opd_pre_status = 0;
804                         d->opd_pre_grow_slow = 0;
805                         d->opd_pre_grow_count = OST_MIN_PRECREATE;
806                         cfs_waitq_signal(&d->opd_pre_waitq);
807                         CDEBUG(D_INFO, "%s: no space: "LPU64" blocks, "LPU64
808                                " free, "LPU64" used, "LPU64" avail -> %d: "
809                                "rc = %d\n", d->opd_obd->obd_name,
810                                msfs->os_blocks, msfs->os_bfree, used,
811                                msfs->os_bavail, d->opd_pre_status, rc);
812                 }
813         }
814
815 out:
816         cfs_waitq_signal(&d->opd_pre_user_waitq);
817 }
818
819 static int osp_init_pre_fid(struct osp_device *osp)
820 {
821         struct lu_env           env;
822         struct osp_thread_info  *osi;
823         struct lu_client_seq    *cli_seq;
824         struct lu_fid           *last_fid;
825         int                     rc;
826         ENTRY;
827
828         /* Return if last_used fid has been initialized */
829         if (!fid_is_zero(&osp->opd_last_used_fid))
830                 RETURN(0);
831
832         rc = lu_env_init(&env, osp->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
833         if (rc) {
834                 CERROR("%s: init env error: rc = %d\n",
835                        osp->opd_obd->obd_name, rc);
836                 RETURN(rc);
837         }
838
839         osi = osp_env_info(&env);
840         last_fid = &osi->osi_fid;
841         fid_zero(last_fid);
842         /* For a freshed fs, it will allocate a new sequence first */
843         if (osp_is_fid_client(osp)) {
844                 cli_seq = osp->opd_obd->u.cli.cl_seq;
845                 rc = seq_client_get_seq(&env, cli_seq, &last_fid->f_seq);
846                 if (rc != 0) {
847                         CERROR("%s: alloc fid error: rc = %d\n",
848                                osp->opd_obd->obd_name, rc);
849                         GOTO(out, rc);
850                 }
851         } else {
852                 last_fid->f_seq = fid_idif_seq(1, osp->opd_index);
853         }
854         last_fid->f_oid = 1;
855         last_fid->f_ver = 0;
856
857         spin_lock(&osp->opd_pre_lock);
858         osp->opd_last_used_fid = *last_fid;
859         osp->opd_pre_used_fid = *last_fid;
860         osp->opd_pre_last_created_fid = *last_fid;
861         spin_unlock(&osp->opd_pre_lock);
862         rc = osp_write_last_oid_seq_files(&env, osp, last_fid, 1);
863         if (rc != 0) {
864                 CERROR("%s: write fid error: rc = %d\n",
865                        osp->opd_obd->obd_name, rc);
866                 GOTO(out, rc);
867         }
868 out:
869         lu_env_fini(&env);
870         RETURN(rc);
871 }
872
873 static int osp_precreate_thread(void *_arg)
874 {
875         struct osp_device       *d = _arg;
876         struct ptlrpc_thread    *thread = &d->opd_pre_thread;
877         struct l_wait_info       lwi = { 0 };
878         char                     pname[16];
879         struct lu_env            env;
880         int                      rc;
881
882         ENTRY;
883
884         sprintf(pname, "osp-pre-%u", d->opd_index);
885         cfs_daemonize(pname);
886
887         rc = lu_env_init(&env, d->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
888         if (rc) {
889                 CERROR("%s: init env error: rc = %d\n", d->opd_obd->obd_name,
890                        rc);
891                 RETURN(rc);
892         }
893
894         spin_lock(&d->opd_pre_lock);
895         thread->t_flags = SVC_RUNNING;
896         spin_unlock(&d->opd_pre_lock);
897         cfs_waitq_signal(&thread->t_ctl_waitq);
898
899         while (osp_precreate_running(d)) {
900                 /*
901                  * need to be connected to OST
902                  */
903                 while (osp_precreate_running(d)) {
904                         l_wait_event(d->opd_pre_waitq,
905                                      !osp_precreate_running(d) ||
906                                      d->opd_new_connection,
907                                      &lwi);
908
909                         if (!osp_precreate_running(d))
910                                 break;
911
912                         if (!d->opd_new_connection)
913                                 continue;
914
915                         d->opd_new_connection = 0;
916                         d->opd_got_disconnected = 0;
917                         break;
918                 }
919
920                 if (d->opd_obd->u.cli.cl_seq->lcs_exp == NULL) {
921                         /* Get new sequence for client first */
922                         LASSERT(d->opd_exp != NULL);
923                         d->opd_obd->u.cli.cl_seq->lcs_exp =
924                         class_export_get(d->opd_exp);
925                         rc = osp_init_pre_fid(d);
926                         if (rc != 0) {
927                                 class_export_put(d->opd_exp);
928                                 d->opd_obd->u.cli.cl_seq->lcs_exp = NULL;
929                                 CERROR("%s: init pre fid error: rc = %d\n",
930                                        d->opd_obd->obd_name, rc);
931                                 continue;
932                         }
933                 }
934
935                 osp_statfs_update(d);
936
937                 /*
938                  * Clean up orphans or recreate missing objects.
939                  */
940                 rc = osp_precreate_cleanup_orphans(&env, d);
941                 if (rc != 0)
942                         continue;
943                 /*
944                  * connected, can handle precreates now
945                  */
946                 while (osp_precreate_running(d)) {
947                         l_wait_event(d->opd_pre_waitq,
948                                      !osp_precreate_running(d) ||
949                                      osp_precreate_near_empty(&env, d) ||
950                                      osp_statfs_need_update(d) ||
951                                      d->opd_got_disconnected, &lwi);
952
953                         if (!osp_precreate_running(d))
954                                 break;
955
956                         /* something happened to the connection
957                          * have to start from the beginning */
958                         if (d->opd_got_disconnected)
959                                 break;
960
961                         if (osp_statfs_need_update(d))
962                                 osp_statfs_update(d);
963
964                         /* To avoid handling different seq in precreate/orphan
965                          * cleanup, it will hold precreate until current seq is
966                          * used up. */
967                         if (unlikely(osp_precreate_end_seq(&env, d) &&
968                             !osp_create_end_seq(&env, d)))
969                                 continue;
970
971                         if (unlikely(osp_precreate_end_seq(&env, d) &&
972                                      osp_create_end_seq(&env, d))) {
973                                 LCONSOLE_INFO("%s:"LPX64" is used up."
974                                               " Update to new seq\n",
975                                               d->opd_obd->obd_name,
976                                          fid_seq(&d->opd_pre_last_created_fid));
977                                 rc = osp_precreate_rollover_new_seq(&env, d);
978                                 if (rc)
979                                         continue;
980                         }
981
982                         if (osp_precreate_near_empty(&env, d)) {
983                                 rc = osp_precreate_send(&env, d);
984                                 /* osp_precreate_send() sets opd_pre_status
985                                  * in case of error, that prevent the using of
986                                  * failed device. */
987                                 if (rc < 0 && rc != -ENOSPC &&
988                                     rc != -ETIMEDOUT && rc != -ENOTCONN)
989                                         CERROR("%s: cannot precreate objects:"
990                                                " rc = %d\n",
991                                                d->opd_obd->obd_name, rc);
992                         }
993                 }
994         }
995
996         thread->t_flags = SVC_STOPPED;
997         lu_env_fini(&env);
998         cfs_waitq_signal(&thread->t_ctl_waitq);
999
1000         RETURN(0);
1001 }
1002
1003 static int osp_precreate_ready_condition(const struct lu_env *env,
1004                                          struct osp_device *d)
1005 {
1006         if (d->opd_pre_recovering)
1007                 return 0;
1008
1009         /* ready if got enough precreated objects */
1010         /* we need to wait for others (opd_pre_reserved) and our object (+1) */
1011         if (d->opd_pre_reserved + 1 < osp_objs_precreated(env, d))
1012                 return 1;
1013
1014         /* ready if OST reported no space and no destoys in progress */
1015         if (d->opd_syn_changes + d->opd_syn_rpc_in_progress == 0 &&
1016             d->opd_pre_status == -ENOSPC)
1017                 return 1;
1018
1019         return 0;
1020 }
1021
1022 static int osp_precreate_timeout_condition(void *data)
1023 {
1024         struct osp_device *d = data;
1025
1026         LCONSOLE_WARN("%s: slow creates, last="DFID", next="DFID", "
1027                       "reserved="LPU64", syn_changes=%lu, "
1028                       "syn_rpc_in_progress=%d, status=%d\n",
1029                       d->opd_obd->obd_name, PFID(&d->opd_pre_last_created_fid),
1030                       PFID(&d->opd_pre_used_fid), d->opd_pre_reserved,
1031                       d->opd_syn_changes, d->opd_syn_rpc_in_progress,
1032                       d->opd_pre_status);
1033
1034         return 1;
1035 }
1036
1037 /*
1038  * called to reserve object in the pool
1039  * return codes:
1040  *  ENOSPC - no space on corresponded OST
1041  *  EAGAIN - precreation is in progress, try later
1042  *  EIO    - no access to OST
1043  */
1044 int osp_precreate_reserve(const struct lu_env *env, struct osp_device *d)
1045 {
1046         struct l_wait_info       lwi;
1047         cfs_time_t               expire = cfs_time_shift(obd_timeout);
1048         int                      precreated, rc;
1049         int                      count = 0;
1050
1051         ENTRY;
1052
1053         LASSERTF(osp_objs_precreated(env, d) >= 0, "Last created FID "DFID
1054                  "Next FID "DFID"\n", PFID(&d->opd_pre_last_created_fid),
1055                  PFID(&d->opd_pre_used_fid));
1056
1057         /*
1058          * wait till:
1059          *  - preallocation is done
1060          *  - no free space expected soon
1061          *  - can't connect to OST for too long (obd_timeout)
1062          *  - OST can allocate fid sequence.
1063          */
1064         while ((rc = d->opd_pre_status) == 0 || rc == -ENOSPC ||
1065                 rc == -ENODEV || rc == -EAGAIN) {
1066
1067 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 3, 90, 0)
1068                 /*
1069                  * to address Andreas's concern on possible busy-loop
1070                  * between this thread and osp_precreate_send()
1071                  */
1072                 if (unlikely(count++ == 1000)) {
1073                         osp_precreate_timeout_condition(d);
1074                         LBUG();
1075                 }
1076 #endif
1077
1078                 /*
1079                  * increase number of precreations
1080                  */
1081                 precreated = osp_objs_precreated(env, d);
1082                 if (d->opd_pre_grow_count < d->opd_pre_max_grow_count &&
1083                     d->opd_pre_grow_slow == 0 &&
1084                     precreated <= (d->opd_pre_grow_count / 4 + 1)) {
1085                         spin_lock(&d->opd_pre_lock);
1086                         d->opd_pre_grow_slow = 1;
1087                         d->opd_pre_grow_count *= 2;
1088                         spin_unlock(&d->opd_pre_lock);
1089                 }
1090
1091                 spin_lock(&d->opd_pre_lock);
1092                 precreated = osp_objs_precreated(env, d);
1093                 if (precreated > d->opd_pre_reserved &&
1094                     !d->opd_pre_recovering) {
1095                         d->opd_pre_reserved++;
1096                         spin_unlock(&d->opd_pre_lock);
1097                         rc = 0;
1098
1099                         /* XXX: don't wake up if precreation is in progress */
1100                         if (osp_precreate_near_empty_nolock(env, d) &&
1101                            !osp_precreate_end_seq_nolock(env, d))
1102                                 cfs_waitq_signal(&d->opd_pre_waitq);
1103
1104                         break;
1105                 }
1106                 spin_unlock(&d->opd_pre_lock);
1107
1108                 /*
1109                  * all precreated objects have been used and no-space
1110                  * status leave us no chance to succeed very soon
1111                  * but if there is destroy in progress, then we should
1112                  * wait till that is done - some space might be released
1113                  */
1114                 if (unlikely(rc == -ENOSPC)) {
1115                         if (d->opd_syn_changes) {
1116                                 /* force local commit to release space */
1117                                 dt_commit_async(env, d->opd_storage);
1118                         }
1119                         if (d->opd_syn_rpc_in_progress) {
1120                                 /* just wait till destroys are done */
1121                                 /* see l_wait_even() few lines below */
1122                         }
1123                         if (d->opd_syn_changes +
1124                             d->opd_syn_rpc_in_progress == 0) {
1125                                 /* no hope for free space */
1126                                 break;
1127                         }
1128                 }
1129
1130                 /* XXX: don't wake up if precreation is in progress */
1131                 cfs_waitq_signal(&d->opd_pre_waitq);
1132
1133                 lwi = LWI_TIMEOUT(expire - cfs_time_current(),
1134                                 osp_precreate_timeout_condition, d);
1135                 if (cfs_time_aftereq(cfs_time_current(), expire))
1136                         break;
1137
1138                 l_wait_event(d->opd_pre_user_waitq,
1139                              osp_precreate_ready_condition(env, d), &lwi);
1140         }
1141
1142         RETURN(rc);
1143 }
1144
1145 /*
1146  * this function relies on reservation made before
1147  */
1148 int osp_precreate_get_fid(const struct lu_env *env, struct osp_device *d,
1149                           struct lu_fid *fid)
1150 {
1151         /* grab next id from the pool */
1152         spin_lock(&d->opd_pre_lock);
1153
1154         LASSERTF(lu_fid_diff(&d->opd_pre_used_fid,
1155                              &d->opd_pre_last_created_fid) < 0,
1156                  "next fid "DFID" last created fid "DFID"\n",
1157                  PFID(&d->opd_pre_used_fid),
1158                  PFID(&d->opd_pre_last_created_fid));
1159
1160         d->opd_pre_used_fid.f_oid++;
1161         memcpy(fid, &d->opd_pre_used_fid, sizeof(*fid));
1162         d->opd_pre_reserved--;
1163         /*
1164          * last_used_id must be changed along with getting new id otherwise
1165          * we might miscalculate gap causing object loss or leak
1166          */
1167         osp_update_last_fid(d, fid);
1168         spin_unlock(&d->opd_pre_lock);
1169
1170         /*
1171          * probably main thread suspended orphan cleanup till
1172          * all reservations are released, see comment in
1173          * osp_precreate_thread() just before orphan cleanup
1174          */
1175         if (unlikely(d->opd_pre_reserved == 0 && d->opd_pre_status))
1176                 cfs_waitq_signal(&d->opd_pre_waitq);
1177
1178         return 0;
1179 }
1180
1181 /*
1182  *
1183  */
1184 int osp_object_truncate(const struct lu_env *env, struct dt_object *dt,
1185                         __u64 size)
1186 {
1187         struct osp_device       *d = lu2osp_dev(dt->do_lu.lo_dev);
1188         struct ptlrpc_request   *req = NULL;
1189         struct obd_import       *imp;
1190         struct ost_body         *body;
1191         struct obdo             *oa = NULL;
1192         int                      rc;
1193
1194         ENTRY;
1195
1196         imp = d->opd_obd->u.cli.cl_import;
1197         LASSERT(imp);
1198
1199         req = ptlrpc_request_alloc(imp, &RQF_OST_PUNCH);
1200         if (req == NULL)
1201                 RETURN(-ENOMEM);
1202
1203         /* XXX: capa support? */
1204         /* osc_set_capa_size(req, &RMF_CAPA1, capa); */
1205         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
1206         if (rc) {
1207                 ptlrpc_request_free(req);
1208                 RETURN(rc);
1209         }
1210
1211         /*
1212          * XXX: decide how do we do here with resend
1213          * if we don't resend, then client may see wrong file size
1214          * if we do resend, then MDS thread can get stuck for quite long
1215          */
1216         req->rq_no_resend = req->rq_no_delay = 1;
1217
1218         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1219         ptlrpc_at_set_req_timeout(req);
1220
1221         OBD_ALLOC_PTR(oa);
1222         if (oa == NULL)
1223                 GOTO(out, rc = -ENOMEM);
1224
1225         rc = fid_ostid_pack(lu_object_fid(&dt->do_lu), &oa->o_oi);
1226         LASSERT(rc == 0);
1227         oa->o_size = size;
1228         oa->o_blocks = OBD_OBJECT_EOF;
1229         oa->o_valid = OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
1230                       OBD_MD_FLID | OBD_MD_FLGROUP;
1231
1232         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
1233         LASSERT(body);
1234         lustre_set_wire_obdo(&body->oa, oa);
1235
1236         /* XXX: capa support? */
1237         /* osc_pack_capa(req, body, capa); */
1238
1239         ptlrpc_request_set_replen(req);
1240
1241         rc = ptlrpc_queue_wait(req);
1242         if (rc)
1243                 CERROR("can't punch object: %d\n", rc);
1244 out:
1245         ptlrpc_req_finished(req);
1246         if (oa)
1247                 OBD_FREE_PTR(oa);
1248         RETURN(rc);
1249 }
1250
1251 int osp_init_precreate(struct osp_device *d)
1252 {
1253         struct l_wait_info       lwi = { 0 };
1254         int                      rc;
1255
1256         ENTRY;
1257
1258         /* initially precreation isn't ready */
1259         d->opd_pre_status = -EAGAIN;
1260         fid_zero(&d->opd_pre_used_fid);
1261         d->opd_pre_used_fid.f_oid = 1;
1262         fid_zero(&d->opd_pre_last_created_fid);
1263         d->opd_pre_last_created_fid.f_oid = 1;
1264         d->opd_pre_reserved = 0;
1265         d->opd_got_disconnected = 1;
1266         d->opd_pre_grow_slow = 0;
1267         d->opd_pre_grow_count = OST_MIN_PRECREATE;
1268         d->opd_pre_min_grow_count = OST_MIN_PRECREATE;
1269         d->opd_pre_max_grow_count = OST_MAX_PRECREATE;
1270
1271         spin_lock_init(&d->opd_pre_lock);
1272         cfs_waitq_init(&d->opd_pre_waitq);
1273         cfs_waitq_init(&d->opd_pre_user_waitq);
1274         cfs_waitq_init(&d->opd_pre_thread.t_ctl_waitq);
1275
1276         /*
1277          * Initialize statfs-related things
1278          */
1279         d->opd_statfs_maxage = 5; /* default update interval */
1280         d->opd_statfs_fresh_till = cfs_time_shift(-1000);
1281         CDEBUG(D_OTHER, "current %llu, fresh till %llu\n",
1282                (unsigned long long)cfs_time_current(),
1283                (unsigned long long)d->opd_statfs_fresh_till);
1284         cfs_timer_init(&d->opd_statfs_timer, osp_statfs_timer_cb, d);
1285
1286         /*
1287          * start thread handling precreation and statfs updates
1288          */
1289         rc = cfs_create_thread(osp_precreate_thread, d, 0);
1290         if (rc < 0) {
1291                 CERROR("can't start precreate thread %d\n", rc);
1292                 RETURN(rc);
1293         }
1294
1295         l_wait_event(d->opd_pre_thread.t_ctl_waitq,
1296                      osp_precreate_running(d) || osp_precreate_stopped(d),
1297                      &lwi);
1298
1299         RETURN(0);
1300 }
1301
1302 void osp_precreate_fini(struct osp_device *d)
1303 {
1304         struct ptlrpc_thread *thread = &d->opd_pre_thread;
1305
1306         ENTRY;
1307
1308         cfs_timer_disarm(&d->opd_statfs_timer);
1309
1310         thread->t_flags = SVC_STOPPING;
1311         cfs_waitq_signal(&d->opd_pre_waitq);
1312
1313         cfs_wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
1314
1315         EXIT;
1316 }
1317