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 /**
 249  * Write fid into last_oid/last_seq file.
 250  **/
 251 int osp_write_last_oid_seq_files(struct lu_env *env, struct osp_device *osp,
 252                                  struct lu_fid *fid, int sync)
 253 {
 254         struct osp_thread_info  *oti = osp_env_info(env);
 255         struct lu_buf      *lb_oid = &oti->osi_lb;
 256         struct lu_buf      *lb_oseq = &oti->osi_lb2;
 257         loff_t             oid_off;
 258         loff_t             oseq_off;
 259         struct thandle    *th;
 260         int                   rc;
 261         ENTRY;
 262
 263         /* Note: through f_oid is only 32bits, it will also write
 264          * 64 bits for oid to keep compatiblity with the previous
 265          * version. */
 266         lb_oid->lb_buf = &fid->f_oid;
 267         lb_oid->lb_len = sizeof(obd_id);
 268         oid_off = sizeof(obd_id) * osp->opd_index;
 269
 270         lb_oseq->lb_buf = &fid->f_seq;
 271         lb_oseq->lb_len = sizeof(obd_id);
 272         oseq_off = sizeof(obd_id) * osp->opd_index;
 273
 274         th = dt_trans_create(env, osp->opd_storage);
 275         if (IS_ERR(th))
 276                 RETURN(PTR_ERR(th));
 277
 278         th->th_sync |= sync;
 279         rc = dt_declare_record_write(env, osp->opd_last_used_oid_file,
 280                                      lb_oid->lb_len, oid_off, th);
 281         if (rc != 0)
 282                 GOTO(out, rc);
 283
 284         rc = dt_declare_record_write(env, osp->opd_last_used_seq_file,
 285                                      lb_oseq->lb_len, oseq_off, th);
 286         if (rc != 0)
 287                 GOTO(out, rc);
 288
 289         rc = dt_trans_start_local(env, osp->opd_storage, th);
 290         if (rc != 0)
 291                 GOTO(out, rc);
 292
 293         rc = dt_record_write(env, osp->opd_last_used_oid_file, lb_oid,
 294                              &oid_off, th);
 295         if (rc != 0) {
 296                 CERROR("%s: can not write to last seq file: rc = %d\n",
 297                         osp->opd_obd->obd_name, rc);
 298                 GOTO(out, rc);
 299         }
 300         rc = dt_record_write(env, osp->opd_last_used_seq_file, lb_oseq,
 301                              &oseq_off, th);
 302         if (rc) {
 303                 CERROR("%s: can not write to last seq file: rc = %d\n",
 304                         osp->opd_obd->obd_name, rc);
 305                 GOTO(out, rc);
 306         }
 307 out:
 308         dt_trans_stop(env, osp->opd_storage, th);
 309         RETURN(rc);
 310 }
 311
 312 /**
 313  * alloc fids for precreation.
 314  * rc = 0 Success, @grow is the count of real allocation.
 315  * rc = 1 Current seq is used up.
 316  * rc < 0 Other error.
 317  **/
 318 static int osp_precreate_fids(const struct lu_env *env, struct osp_device *osp,
 319                               struct lu_fid *fid, int *grow)
 320 {
 321         struct osp_thread_info  *osi = osp_env_info(env);
 322         __u64                   end;
 323         int                     i = 0;
 324
 325         if (fid_is_idif(fid)) {
 326                 struct lu_fid   *last_fid;
 327                 struct ost_id   *oi = &osi->osi_oi;
 328
 329                 spin_lock(&osp->opd_pre_lock);
 330                 last_fid = &osp->opd_pre_last_created_fid;
 331                 ostid_idif_pack(last_fid, oi);
 332                 end = min(oi->oi_id + *grow, IDIF_MAX_OID);
 333                 *grow = end - oi->oi_id;
 334                 oi->oi_id += *grow;
 335                 spin_unlock(&osp->opd_pre_lock);
 336
 337                 if (*grow == 0)
 338                         return 1;
 339
 340                 ostid_idif_unpack(oi, fid, osp->opd_index);
 341                 return 0;
 342         }
 343
 344         spin_lock(&osp->opd_pre_lock);
 345         *fid = osp->opd_pre_last_created_fid;
 346         end = fid->f_oid;
 347         end = min((end + *grow), (__u64)LUSTRE_DATA_SEQ_MAX_WIDTH);
 348         *grow = end - fid->f_oid;
 349         fid->f_oid += end - fid->f_oid;
 350         spin_unlock(&osp->opd_pre_lock);
 351
 352         CDEBUG(D_INFO, "Expect %d, actual %d ["DFID" -- "DFID"]\n",
 353                *grow, i, PFID(fid), PFID(&osp->opd_pre_last_created_fid));
 354
 355         return *grow > 0 ? 0 : 1;
 356 }
 357
 358 static int osp_precreate_send(const struct lu_env *env, struct osp_device *d)
 359 {
 360         struct osp_thread_info  *oti = osp_env_info(env);
 361         struct ptlrpc_request   *req;
 362         struct obd_import       *imp;
 363         struct ost_body         *body;
 364         int                      rc, grow, diff;
 365         struct lu_fid           *fid = &oti->osi_fid;
 366         ENTRY;
 367
 368         /* don't precreate new objects till OST healthy and has free space */
 369         if (unlikely(d->opd_pre_status)) {
 370                 CDEBUG(D_INFO, "%s: don't send new precreate: rc = %d\n",
 371                        d->opd_obd->obd_name, d->opd_pre_status);
 372                 RETURN(0);
 373         }
 374
 375         /*
 376          * if not connection/initialization is compeleted, ignore
 377          */
 378         imp = d->opd_obd->u.cli.cl_import;
 379         LASSERT(imp);
 380
 381         req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
 382         if (req == NULL)
 383                 RETURN(-ENOMEM);
 384         req->rq_request_portal = OST_CREATE_PORTAL;
 385         /* we should not resend create request - anyway we will have delorphan
 386          * and kill these objects */
 387         req->rq_no_delay = req->rq_no_resend = 1;
 388
 389         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 390         if (rc) {
 391                 ptlrpc_request_free(req);
 392                 RETURN(rc);
 393         }
 394
 395         spin_lock(&d->opd_pre_lock);
 396         if (d->opd_pre_grow_count > d->opd_pre_max_grow_count / 2)
 397                 d->opd_pre_grow_count = d->opd_pre_max_grow_count / 2;
 398         grow = d->opd_pre_grow_count;
 399         spin_unlock(&d->opd_pre_lock);
 400
 401         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 402         LASSERT(body);
 403
 404         rc = osp_precreate_fids(env, d, fid, &grow);
 405         if (rc == 1) {
 406                 /* Current seq has been used up*/
 407                 if (!osp_is_fid_client(d)) {
 408                         osp_pre_update_status(d, -ENOSPC);
 409                         rc = -ENOSPC;
 410                 }
 411                 cfs_waitq_signal(&d->opd_pre_waitq);
 412                 GOTO(out_req, rc);
 413         }
 414
 415         if (!osp_is_fid_client(d)) {
 416                 /* Non-FID client will always send seq 0 because of
 417                  * compatiblity */
 418                 LASSERTF(fid_is_idif(fid), "Invalid fid "DFID"\n", PFID(fid));
 419                 fid->f_seq = 0;
 420         }
 421
 422         ostid_fid_pack(fid, &body->oa.o_oi);
 423         body->oa.o_valid = OBD_MD_FLGROUP;
 424
 425         ptlrpc_request_set_replen(req);
 426
 427         rc = ptlrpc_queue_wait(req);
 428         if (rc) {
 429                 CERROR("%s: can't precreate: rc = %d\n", d->opd_obd->obd_name,
 430                        rc);
 431                 GOTO(out_req, rc);
 432         }
 433         LASSERT(req->rq_transno == 0);
 434
 435         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 436         if (body == NULL)
 437                 GOTO(out_req, rc = -EPROTO);
 438
 439         fid_ostid_unpack(fid, &body->oa.o_oi, d->opd_index);
 440         LASSERTF(lu_fid_diff(fid, &d->opd_pre_used_fid) > 0,
 441                  "reply fid "DFID" pre used fid "DFID"\n", PFID(fid),
 442                  PFID(&d->opd_pre_used_fid));
 443
 444         CDEBUG(D_HA, "%s: new last_created "DFID"\n", d->opd_obd->obd_name,
 445                PFID(fid));
 446
 447         diff = lu_fid_diff(fid, &d->opd_pre_last_created_fid);
 448
 449         spin_lock(&d->opd_pre_lock);
 450         if (diff < grow) {
 451                 /* the OST has not managed to create all the
 452                  * objects we asked for */
 453                 d->opd_pre_grow_count = max(diff, OST_MIN_PRECREATE);
 454                 d->opd_pre_grow_slow = 1;
 455         } else {
 456                 /* the OST is able to keep up with the work,
 457                  * we could consider increasing grow_count
 458                  * next time if needed */
 459                 d->opd_pre_grow_slow = 0;
 460         }
 461
 462         d->opd_pre_last_created_fid = *fid;
 463         spin_unlock(&d->opd_pre_lock);
 464
 465         CDEBUG(D_OTHER, "current precreated pool: "DFID"-"DFID"\n",
 466                PFID(&d->opd_pre_used_fid), PFID(&d->opd_pre_last_created_fid));
 467 out_req:
 468         /* now we can wakeup all users awaiting for objects */
 469         osp_pre_update_status(d, rc);
 470         cfs_waitq_signal(&d->opd_pre_user_waitq);
 471
 472         ptlrpc_req_finished(req);
 473         RETURN(rc);
 474 }
 475
 476 static int osp_get_lastfid_from_ost(struct osp_device *d)
 477 {
 478         struct ptlrpc_request   *req = NULL;
 479         struct obd_import       *imp;
 480         struct lu_fid           *last_fid = &d->opd_last_used_fid;
 481         char                    *tmp;
 482         int                     rc;
 483         ENTRY;
 484
 485         imp = d->opd_obd->u.cli.cl_import;
 486         LASSERT(imp);
 487
 488         req = ptlrpc_request_alloc(imp, &RQF_OST_GET_INFO_LAST_FID);
 489         if (req == NULL)
 490                 RETURN(-ENOMEM);
 491
 492         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
 493                              RCL_CLIENT, sizeof(KEY_LAST_FID));
 494
 495         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
 496                              RCL_CLIENT, sizeof(*last_fid));
 497
 498         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
 499         if (rc) {
 500                 ptlrpc_request_free(req);
 501                 RETURN(rc);
 502         }
 503
 504         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
 505         memcpy(tmp, KEY_LAST_FID, sizeof(KEY_LAST_FID));
 506
 507         req->rq_no_delay = req->rq_no_resend = 1;
 508         fid_cpu_to_le(last_fid, last_fid);
 509         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
 510         memcpy(tmp, last_fid, sizeof(*last_fid));
 511         ptlrpc_request_set_replen(req);
 512
 513         rc = ptlrpc_queue_wait(req);
 514         if (rc) {
 515                 /* bad-bad OST.. let sysadm sort this out */
 516                 if (rc == -ENOTSUPP) {
 517                         CERROR("%s: server does not support FID: rc = %d\n",
 518                                d->opd_obd->obd_name, -ENOTSUPP);
 519                 }
 520                 ptlrpc_set_import_active(imp, 0);
 521                 GOTO(out, rc);
 522         }
 523
 524         last_fid = req_capsule_server_get(&req->rq_pill, &RMF_FID);
 525         if (last_fid == NULL || !fid_is_sane(last_fid)) {
 526                 CERROR("%s: Got insane last_fid "DFID"\n",
 527                        d->opd_obd->obd_name, PFID(last_fid));
 528                 GOTO(out, rc = -EPROTO);
 529         }
 530
 531         /* Only update the last used fid, if the OST has objects for
 532          * this sequence, i.e. fid_oid > 0 */
 533         if (fid_oid(last_fid) > 0)
 534                 d->opd_last_used_fid = *last_fid;
 535
 536         CDEBUG(D_HA, "%s: Got insane last_fid "DFID"\n", d->opd_obd->obd_name,
 537                PFID(last_fid));
 538
 539 out:
 540         ptlrpc_req_finished(req);
 541         RETURN(rc);
 542 }
 543
 544 /**
 545  * asks OST to clean precreate orphans
 546  * and gets next id for new objects
 547  */
 548 static int osp_precreate_cleanup_orphans(struct lu_env *env,
 549                                          struct osp_device *d)
 550 {
 551         struct osp_thread_info  *osi = osp_env_info(env);
 552         struct lu_fid           *last_fid = &osi->osi_fid;
 553         struct ptlrpc_request   *req = NULL;
 554         struct obd_import       *imp;
 555         struct ost_body         *body;
 556         struct l_wait_info       lwi = { 0 };
 557         int                      update_status = 0;
 558         int                      rc;
 559         int                      diff;
 560
 561         ENTRY;
 562
 563         /*
 564          * wait for local recovery to finish, so we can cleanup orphans
 565          * orphans are all objects since "last used" (assigned), but
 566          * there might be objects reserved and in some cases they won't
 567          * be used. we can't cleanup them till we're sure they won't be
 568          * used. also can't we allow new reservations because they may
 569          * end up getting orphans being cleaned up below. so we block
 570          * new reservations and wait till all reserved objects either
 571          * user or released.
 572          */
 573         spin_lock(&d->opd_pre_lock);
 574         d->opd_pre_recovering = 1;
 575         spin_unlock(&d->opd_pre_lock);
 576         /*
 577          * The locking above makes sure the opd_pre_reserved check below will
 578          * catch all osp_precreate_reserve() calls who find
 579          * "!opd_pre_recovering".
 580          */
 581         l_wait_event(d->opd_pre_waitq,
 582                      (!d->opd_pre_reserved && d->opd_recovery_completed) ||
 583                      !osp_precreate_running(d) || d->opd_got_disconnected,
 584                      &lwi);
 585         if (!osp_precreate_running(d) || d->opd_got_disconnected)
 586                 GOTO(out, rc = -EAGAIN);
 587
 588         CDEBUG(D_HA, "%s: going to cleanup orphans since "DFID"\n",
 589                d->opd_obd->obd_name, PFID(&d->opd_last_used_fid));
 590
 591         *last_fid = d->opd_last_used_fid;
 592         /* The OSP should already get the valid seq now */
 593         LASSERT(!fid_is_zero(last_fid));
 594         if (fid_oid(&d->opd_last_used_fid) < 2) {
 595                 /* lastfid looks strange... ask OST */
 596                 rc = osp_get_lastfid_from_ost(d);
 597                 if (rc)
 598                         GOTO(out, rc);
 599         }
 600
 601         imp = d->opd_obd->u.cli.cl_import;
 602         LASSERT(imp);
 603
 604         req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
 605         if (req == NULL)
 606                 GOTO(out, rc = -ENOMEM);
 607
 608         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 609         if (rc) {
 610                 ptlrpc_request_free(req);
 611                 req = NULL;
 612                 GOTO(out, rc);
 613         }
 614
 615         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 616         if (body == NULL)
 617                 GOTO(out, rc = -EPROTO);
 618
 619         body->oa.o_flags = OBD_FL_DELORPHAN;
 620         body->oa.o_valid = OBD_MD_FLFLAGS | OBD_MD_FLGROUP;
 621         if (osp_is_fid_client(d))
 622                 body->oa.o_seq = fid_seq(&d->opd_last_used_fid);
 623         else
 624                 body->oa.o_seq = 0;
 625         /* remove from NEXT after used one */
 626         body->oa.o_id = fid_oid(&d->opd_last_used_fid);
 627
 628         ptlrpc_request_set_replen(req);
 629
 630         /* Don't resend the delorphan req */
 631         req->rq_no_resend = req->rq_no_delay = 1;
 632
 633         rc = ptlrpc_queue_wait(req);
 634         if (rc) {
 635                 update_status = 1;
 636                 GOTO(out, rc);
 637         }
 638
 639         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 640         if (body == NULL)
 641                 GOTO(out, rc = -EPROTO);
 642
 643         /*
 644          * OST provides us with id new pool starts from in body->oa.o_id
 645          */
 646         fid_ostid_unpack(last_fid, &body->oa.o_oi, d->opd_index);
 647         CDEBUG(D_INFO, "%s: last_fid "DFID" server last fid "DFID"\n",
 648                d->opd_obd->obd_name, PFID(&d->opd_last_used_fid),
 649                PFID(last_fid));
 650
 651         spin_lock(&d->opd_pre_lock);
 652         diff = lu_fid_diff(&d->opd_last_used_fid, last_fid);
 653         if (diff > 0) {
 654                 d->opd_pre_grow_count = OST_MIN_PRECREATE + diff;
 655                 d->opd_pre_last_created_fid = d->opd_last_used_fid;
 656         } else {
 657                 d->opd_pre_grow_count = OST_MIN_PRECREATE;
 658                 d->opd_pre_last_created_fid = *last_fid;
 659         }
 660         /*
 661          * This empties the pre-creation pool and effectively blocks any new
 662          * reservations.
 663          */
 664         LASSERT(fid_oid(&d->opd_pre_last_created_fid) <=
 665                 LUSTRE_DATA_SEQ_MAX_WIDTH);
 666         d->opd_pre_used_fid = d->opd_pre_last_created_fid;
 667         d->opd_pre_grow_slow = 0;
 668         spin_unlock(&d->opd_pre_lock);
 669
 670         CDEBUG(D_HA, "%s: Got last_id "DFID" from OST, last_created "DFID
 671                "last_used is "DFID"\n", d->opd_obd->obd_name, PFID(last_fid),
 672                PFID(&d->opd_pre_last_created_fid), PFID(&d->opd_last_used_fid));
 673 out:
 674         if (req)
 675                 ptlrpc_req_finished(req);
 676
 677         d->opd_pre_recovering = 0;
 678
 679         /*
 680          * If rc is zero, the pre-creation window should have been emptied.
 681          * Since waking up the herd would be useless without pre-created
 682          * objects, we defer the signal to osp_precreate_send() in that case.
 683          */
 684         if (rc != 0) {
 685                 if (update_status) {
 686                         CERROR("%s: cannot cleanup orphans: rc = %d\n",
 687                                d->opd_obd->obd_name, rc);
 688                         /* we can't proceed from here, OST seem to
 689                          * be in a bad shape, better to wait for
 690                          * a new instance of the server and repeat
 691                          * from the beginning. notify possible waiters
 692                          * this OSP isn't quite functional yet */
 693                         osp_pre_update_status(d, rc);
 694                 } else {
 695                         cfs_waitq_signal(&d->opd_pre_user_waitq);
 696                 }
 697         }
 698
 699         RETURN(rc);
 700 }
 701
 702 /*
 703  * the function updates current precreation status used: functional or not
 704  *
 705  * rc is a last code from the transport, rc == 0 meaning transport works
 706  * well and users of lod can use objects from this OSP
 707  *
 708  * the status depends on current usage of OST
 709  */
 710 void osp_pre_update_status(struct osp_device *d, int rc)
 711 {
 712         struct obd_statfs       *msfs = &d->opd_statfs;
 713         int                      old = d->opd_pre_status;
 714         __u64                    used;
 715
 716         d->opd_pre_status = rc;
 717         if (rc)
 718                 goto out;
 719
 720         /* Add a bit of hysteresis so this flag isn't continually flapping,
 721          * and ensure that new files don't get extremely fragmented due to
 722          * only a small amount of available space in the filesystem.
 723          * We want to set the NOSPC flag when there is less than ~0.1% free
 724          * and clear it when there is at least ~0.2% free space, so:
 725          *                   avail < ~0.1% max          max = avail + used
 726          *            1025 * avail < avail + used       used = blocks - free
 727          *            1024 * avail < used
 728          *            1024 * avail < blocks - free
 729          *                   avail < ((blocks - free) >> 10)
 730          *
 731          * On very large disk, say 16TB 0.1% will be 16 GB. We don't want to
 732          * lose that amount of space so in those cases we report no space left
 733          * if their is less than 1 GB left.                             */
 734         if (likely(msfs->os_type)) {
 735                 used = min_t(__u64, (msfs->os_blocks - msfs->os_bfree) >> 10,
 736                                     1 << 30);
 737                 if ((msfs->os_ffree < 32) || (msfs->os_bavail < used)) {
 738                         d->opd_pre_status = -ENOSPC;
 739                         if (old != -ENOSPC)
 740                                 CDEBUG(D_INFO, "%s: status: "LPU64" blocks, "
 741                                        LPU64" free, "LPU64" used, "LPU64" "
 742                                        "avail -> %d: rc = %d\n",
 743                                        d->opd_obd->obd_name, msfs->os_blocks,
 744                                        msfs->os_bfree, used, msfs->os_bavail,
 745                                        d->opd_pre_status, rc);
 746                         CDEBUG(D_INFO,
 747                                "non-commited changes: %lu, in progress: %u\n",
 748                                d->opd_syn_changes, d->opd_syn_rpc_in_progress);
 749                 } else if (old == -ENOSPC) {
 750                         d->opd_pre_status = 0;
 751                         d->opd_pre_grow_slow = 0;
 752                         d->opd_pre_grow_count = OST_MIN_PRECREATE;
 753                         cfs_waitq_signal(&d->opd_pre_waitq);
 754                         CDEBUG(D_INFO, "%s: no space: "LPU64" blocks, "LPU64
 755                                " free, "LPU64" used, "LPU64" avail -> %d: "
 756                                "rc = %d\n", d->opd_obd->obd_name,
 757                                msfs->os_blocks, msfs->os_bfree, used,
 758                                msfs->os_bavail, d->opd_pre_status, rc);
 759                 }
 760         }
 761
 762 out:
 763         cfs_waitq_signal(&d->opd_pre_user_waitq);
 764 }
 765
 766 static int osp_init_pre_fid(struct osp_device *osp)
 767 {
 768         struct lu_env           env;
 769         struct osp_thread_info  *osi;
 770         struct lu_client_seq    *cli_seq;
 771         struct lu_fid           *last_fid;
 772         int                     rc;
 773         ENTRY;
 774
 775         /* Return if last_used fid has been initialized */
 776         if (!fid_is_zero(&osp->opd_last_used_fid))
 777                 RETURN(0);
 778
 779         rc = lu_env_init(&env, osp->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
 780         if (rc) {
 781                 CERROR("%s: init env error: rc = %d\n",
 782                        osp->opd_obd->obd_name, rc);
 783                 RETURN(rc);
 784         }
 785
 786         osi = osp_env_info(&env);
 787         last_fid = &osi->osi_fid;
 788         fid_zero(last_fid);
 789         /* For a freshed fs, it will allocate a new sequence first */
 790         if (osp_is_fid_client(osp)) {
 791                 cli_seq = osp->opd_obd->u.cli.cl_seq;
 792                 rc = seq_client_get_seq(&env, cli_seq, &last_fid->f_seq);
 793                 if (rc != 0) {
 794                         CERROR("%s: alloc fid error: rc = %d\n",
 795                                osp->opd_obd->obd_name, rc);
 796                         GOTO(out, rc);
 797                 }
 798         } else {
 799                 last_fid->f_seq = fid_idif_seq(1, osp->opd_index);
 800         }
 801         last_fid->f_oid = 1;
 802         last_fid->f_ver = 0;
 803
 804         spin_lock(&osp->opd_pre_lock);
 805         osp->opd_last_used_fid = *last_fid;
 806         osp->opd_pre_used_fid = *last_fid;
 807         osp->opd_pre_last_created_fid = *last_fid;
 808         spin_unlock(&osp->opd_pre_lock);
 809         rc = osp_write_last_oid_seq_files(&env, osp, last_fid, 1);
 810         if (rc != 0) {
 811                 CERROR("%s: write fid error: rc = %d\n",
 812                        osp->opd_obd->obd_name, rc);
 813                 GOTO(out, rc);
 814         }
 815 out:
 816         lu_env_fini(&env);
 817         RETURN(rc);
 818 }
 819
 820 static int osp_precreate_thread(void *_arg)
 821 {
 822         struct osp_device       *d = _arg;
 823         struct ptlrpc_thread    *thread = &d->opd_pre_thread;
 824         struct l_wait_info       lwi = { 0 };
 825         char                     pname[16];
 826         struct lu_env            env;
 827         int                      rc;
 828
 829         ENTRY;
 830
 831         sprintf(pname, "osp-pre-%u\n", d->opd_index);
 832         cfs_daemonize(pname);
 833
 834         rc = lu_env_init(&env, d->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
 835         if (rc) {
 836                 CERROR("%s: init env error: rc = %d\n", d->opd_obd->obd_name,
 837                        rc);
 838                 RETURN(rc);
 839         }
 840
 841         spin_lock(&d->opd_pre_lock);
 842         thread->t_flags = SVC_RUNNING;
 843         spin_unlock(&d->opd_pre_lock);
 844         cfs_waitq_signal(&thread->t_ctl_waitq);
 845
 846         while (osp_precreate_running(d)) {
 847                 /*
 848                  * need to be connected to OST
 849                  */
 850                 while (osp_precreate_running(d)) {
 851                         l_wait_event(d->opd_pre_waitq,
 852                                      !osp_precreate_running(d) ||
 853                                      d->opd_new_connection,
 854                                      &lwi);
 855
 856                         if (!osp_precreate_running(d))
 857                                 break;
 858
 859                         if (!d->opd_new_connection)
 860                                 continue;
 861
 862                         d->opd_new_connection = 0;
 863                         d->opd_got_disconnected = 0;
 864                         break;
 865                 }
 866
 867                 if (d->opd_obd->u.cli.cl_seq->lcs_exp == NULL) {
 868                         /* Get new sequence for client first */
 869                         LASSERT(d->opd_exp != NULL);
 870                         d->opd_obd->u.cli.cl_seq->lcs_exp =
 871                         class_export_get(d->opd_exp);
 872                         rc = osp_init_pre_fid(d);
 873                         if (rc != 0) {
 874                                 class_export_put(d->opd_exp);
 875                                 d->opd_obd->u.cli.cl_seq->lcs_exp = NULL;
 876                                 CERROR("%s: init pre fid error: rc = %d\n",
 877                                        d->opd_obd->obd_name, rc);
 878                                 continue;
 879                         }
 880                 }
 881
 882                 osp_statfs_update(d);
 883
 884                 /*
 885                  * Clean up orphans or recreate missing objects.
 886                  */
 887                 rc = osp_precreate_cleanup_orphans(&env, d);
 888                 if (rc != 0)
 889                         continue;
 890                 /*
 891                  * connected, can handle precreates now
 892                  */
 893                 while (osp_precreate_running(d)) {
 894                         l_wait_event(d->opd_pre_waitq,
 895                                      !osp_precreate_running(d) ||
 896                                      osp_precreate_near_empty(&env, d) ||
 897                                      osp_statfs_need_update(d) ||
 898                                      d->opd_got_disconnected, &lwi);
 899
 900                         if (!osp_precreate_running(d))
 901                                 break;
 902
 903                         /* something happened to the connection
 904                          * have to start from the beginning */
 905                         if (d->opd_got_disconnected)
 906                                 break;
 907
 908                         if (osp_statfs_need_update(d))
 909                                 osp_statfs_update(d);
 910
 911                         if (osp_precreate_near_empty(&env, d)) {
 912                                 rc = osp_precreate_send(&env, d);
 913                                 /* osp_precreate_send() sets opd_pre_status
 914                                  * in case of error, that prevent the using of
 915                                  * failed device. */
 916                                 if (rc < 0 && rc != -ENOSPC &&
 917                                     rc != -ETIMEDOUT && rc != -ENOTCONN)
 918                                         CERROR("%s: cannot precreate objects:"
 919                                                " rc = %d\n",
 920                                                d->opd_obd->obd_name, rc);
 921                         }
 922                 }
 923         }
 924
 925         thread->t_flags = SVC_STOPPED;
 926         lu_env_fini(&env);
 927         cfs_waitq_signal(&thread->t_ctl_waitq);
 928
 929         RETURN(0);
 930 }
 931
 932 static int osp_precreate_ready_condition(const struct lu_env *env,
 933                                          struct osp_device *d)
 934 {
 935         if (d->opd_pre_recovering)
 936                 return 0;
 937
 938         /* ready if got enough precreated objects */
 939         /* we need to wait for others (opd_pre_reserved) and our object (+1) */
 940         if (d->opd_pre_reserved + 1 < osp_objs_precreated(env, d))
 941                 return 1;
 942
 943         /* ready if OST reported no space and no destoys in progress */
 944         if (d->opd_syn_changes + d->opd_syn_rpc_in_progress == 0 &&
 945             d->opd_pre_status == -ENOSPC)
 946                 return 1;
 947
 948         return 0;
 949 }
 950
 951 static int osp_precreate_timeout_condition(void *data)
 952 {
 953         struct osp_device *d = data;
 954
 955         LCONSOLE_WARN("%s: slow creates, last="DFID", next="DFID", "
 956                       "reserved="LPU64", syn_changes=%lu, "
 957                       "syn_rpc_in_progress=%d, status=%d\n",
 958                       d->opd_obd->obd_name, PFID(&d->opd_pre_last_created_fid),
 959                       PFID(&d->opd_pre_used_fid), d->opd_pre_reserved,
 960                       d->opd_syn_changes, d->opd_syn_rpc_in_progress,
 961                       d->opd_pre_status);
 962
 963         return 1;
 964 }
 965
 966 /*
 967  * called to reserve object in the pool
 968  * return codes:
 969  *  ENOSPC - no space on corresponded OST
 970  *  EAGAIN - precreation is in progress, try later
 971  *  EIO    - no access to OST
 972  */
 973 int osp_precreate_reserve(const struct lu_env *env, struct osp_device *d)
 974 {
 975         struct l_wait_info       lwi;
 976         cfs_time_t               expire = cfs_time_shift(obd_timeout);
 977         int                      precreated, rc;
 978         int                      count = 0;
 979
 980         ENTRY;
 981
 982         LASSERTF(osp_objs_precreated(env, d) >= 0, "Last created FID "DFID
 983                  "Next FID "DFID"\n", PFID(&d->opd_pre_last_created_fid),
 984                  PFID(&d->opd_pre_used_fid));
 985
 986         /*
 987          * wait till:
 988          *  - preallocation is done
 989          *  - no free space expected soon
 990          *  - can't connect to OST for too long (obd_timeout)
 991          *  - OST can allocate fid sequence.
 992          */
 993         while ((rc = d->opd_pre_status) == 0 || rc == -ENOSPC ||
 994                 rc == -ENODEV || rc == -EAGAIN) {
 995
 996 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 3, 90, 0)
 997                 /*
 998                  * to address Andreas's concern on possible busy-loop
 999                  * between this thread and osp_precreate_send()
1000                  */
1001                 if (unlikely(count++ == 1000)) {
1002                         osp_precreate_timeout_condition(d);
1003                         LBUG();
1004                 }
1005 #endif
1006
1007                 /*
1008                  * increase number of precreations
1009                  */
1010                 precreated = osp_objs_precreated(env, d);
1011                 if (d->opd_pre_grow_count < d->opd_pre_max_grow_count &&
1012                     d->opd_pre_grow_slow == 0 &&
1013                     precreated <= (d->opd_pre_grow_count / 4 + 1)) {
1014                         spin_lock(&d->opd_pre_lock);
1015                         d->opd_pre_grow_slow = 1;
1016                         d->opd_pre_grow_count *= 2;
1017                         spin_unlock(&d->opd_pre_lock);
1018                 }
1019
1020                 spin_lock(&d->opd_pre_lock);
1021                 precreated = osp_objs_precreated(env, d);
1022                 if (precreated > d->opd_pre_reserved &&
1023                     !d->opd_pre_recovering) {
1024                         d->opd_pre_reserved++;
1025                         spin_unlock(&d->opd_pre_lock);
1026                         rc = 0;
1027
1028                         /* XXX: don't wake up if precreation is in progress */
1029                         if (osp_precreate_near_empty_nolock(env, d))
1030                                 cfs_waitq_signal(&d->opd_pre_waitq);
1031
1032                         break;
1033                 }
1034                 spin_unlock(&d->opd_pre_lock);
1035
1036                 /*
1037                  * all precreated objects have been used and no-space
1038                  * status leave us no chance to succeed very soon
1039                  * but if there is destroy in progress, then we should
1040                  * wait till that is done - some space might be released
1041                  */
1042                 if (unlikely(rc == -ENOSPC)) {
1043                         if (d->opd_syn_changes) {
1044                                 /* force local commit to release space */
1045                                 dt_commit_async(env, d->opd_storage);
1046                         }
1047                         if (d->opd_syn_rpc_in_progress) {
1048                                 /* just wait till destroys are done */
1049                                 /* see l_wait_even() few lines below */
1050                         }
1051                         if (d->opd_syn_changes +
1052                             d->opd_syn_rpc_in_progress == 0) {
1053                                 /* no hope for free space */
1054                                 break;
1055                         }
1056                 }
1057
1058                 /* XXX: don't wake up if precreation is in progress */
1059                 cfs_waitq_signal(&d->opd_pre_waitq);
1060
1061                 lwi = LWI_TIMEOUT(expire - cfs_time_current(),
1062                                 osp_precreate_timeout_condition, d);
1063                 if (cfs_time_aftereq(cfs_time_current(), expire))
1064                         break;
1065
1066                 l_wait_event(d->opd_pre_user_waitq,
1067                              osp_precreate_ready_condition(env, d), &lwi);
1068         }
1069
1070         RETURN(rc);
1071 }
1072
1073 /*
1074  * this function relies on reservation made before
1075  */
1076 int osp_precreate_get_fid(const struct lu_env *env, struct osp_device *d,
1077                           struct lu_fid *fid)
1078 {
1079         /* grab next id from the pool */
1080         spin_lock(&d->opd_pre_lock);
1081
1082         LASSERTF(lu_fid_diff(&d->opd_pre_used_fid,
1083                              &d->opd_pre_last_created_fid) < 0,
1084                  "next fid "DFID" last created fid "DFID"\n",
1085                  PFID(&d->opd_pre_used_fid),
1086                  PFID(&d->opd_pre_last_created_fid));
1087
1088         d->opd_pre_used_fid.f_oid++;
1089         memcpy(fid, &d->opd_pre_used_fid, sizeof(*fid));
1090         d->opd_pre_reserved--;
1091         /*
1092          * last_used_id must be changed along with getting new id otherwise
1093          * we might miscalculate gap causing object loss or leak
1094          */
1095         osp_update_last_fid(d, fid);
1096         spin_unlock(&d->opd_pre_lock);
1097
1098         /*
1099          * probably main thread suspended orphan cleanup till
1100          * all reservations are released, see comment in
1101          * osp_precreate_thread() just before orphan cleanup
1102          */
1103         if (unlikely(d->opd_pre_reserved == 0 && d->opd_pre_status))
1104                 cfs_waitq_signal(&d->opd_pre_waitq);
1105
1106         return 0;
1107 }
1108
1109 /*
1110  *
1111  */
1112 int osp_object_truncate(const struct lu_env *env, struct dt_object *dt,
1113                         __u64 size)
1114 {
1115         struct osp_device       *d = lu2osp_dev(dt->do_lu.lo_dev);
1116         struct ptlrpc_request   *req = NULL;
1117         struct obd_import       *imp;
1118         struct ost_body         *body;
1119         struct obdo             *oa = NULL;
1120         int                      rc;
1121
1122         ENTRY;
1123
1124         imp = d->opd_obd->u.cli.cl_import;
1125         LASSERT(imp);
1126
1127         req = ptlrpc_request_alloc(imp, &RQF_OST_PUNCH);
1128         if (req == NULL)
1129                 RETURN(-ENOMEM);
1130
1131         /* XXX: capa support? */
1132         /* osc_set_capa_size(req, &RMF_CAPA1, capa); */
1133         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
1134         if (rc) {
1135                 ptlrpc_request_free(req);
1136                 RETURN(rc);
1137         }
1138
1139         /*
1140          * XXX: decide how do we do here with resend
1141          * if we don't resend, then client may see wrong file size
1142          * if we do resend, then MDS thread can get stuck for quite long
1143          */
1144         req->rq_no_resend = req->rq_no_delay = 1;
1145
1146         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1147         ptlrpc_at_set_req_timeout(req);
1148
1149         OBD_ALLOC_PTR(oa);
1150         if (oa == NULL)
1151                 GOTO(out, rc = -ENOMEM);
1152
1153         rc = fid_ostid_pack(lu_object_fid(&dt->do_lu), &oa->o_oi);
1154         LASSERT(rc == 0);
1155         oa->o_size = size;
1156         oa->o_blocks = OBD_OBJECT_EOF;
1157         oa->o_valid = OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
1158                       OBD_MD_FLID | OBD_MD_FLGROUP;
1159
1160         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
1161         LASSERT(body);
1162         lustre_set_wire_obdo(&body->oa, oa);
1163
1164         /* XXX: capa support? */
1165         /* osc_pack_capa(req, body, capa); */
1166
1167         ptlrpc_request_set_replen(req);
1168
1169         rc = ptlrpc_queue_wait(req);
1170         if (rc)
1171                 CERROR("can't punch object: %d\n", rc);
1172 out:
1173         ptlrpc_req_finished(req);
1174         if (oa)
1175                 OBD_FREE_PTR(oa);
1176         RETURN(rc);
1177 }
1178
1179 int osp_init_precreate(struct osp_device *d)
1180 {
1181         struct l_wait_info       lwi = { 0 };
1182         int                      rc;
1183
1184         ENTRY;
1185
1186         /* initially precreation isn't ready */
1187         d->opd_pre_status = -EAGAIN;
1188         fid_zero(&d->opd_pre_used_fid);
1189         d->opd_pre_used_fid.f_oid = 1;
1190         fid_zero(&d->opd_pre_last_created_fid);
1191         d->opd_pre_last_created_fid.f_oid = 1;
1192         d->opd_pre_reserved = 0;
1193         d->opd_got_disconnected = 1;
1194         d->opd_pre_grow_slow = 0;
1195         d->opd_pre_grow_count = OST_MIN_PRECREATE;
1196         d->opd_pre_min_grow_count = OST_MIN_PRECREATE;
1197         d->opd_pre_max_grow_count = OST_MAX_PRECREATE;
1198
1199         spin_lock_init(&d->opd_pre_lock);
1200         cfs_waitq_init(&d->opd_pre_waitq);
1201         cfs_waitq_init(&d->opd_pre_user_waitq);
1202         cfs_waitq_init(&d->opd_pre_thread.t_ctl_waitq);
1203
1204         /*
1205          * Initialize statfs-related things
1206          */
1207         d->opd_statfs_maxage = 5; /* default update interval */
1208         d->opd_statfs_fresh_till = cfs_time_shift(-1000);
1209         CDEBUG(D_OTHER, "current %llu, fresh till %llu\n",
1210                (unsigned long long)cfs_time_current(),
1211                (unsigned long long)d->opd_statfs_fresh_till);
1212         cfs_timer_init(&d->opd_statfs_timer, osp_statfs_timer_cb, d);
1213
1214         /*
1215          * start thread handling precreation and statfs updates
1216          */
1217         rc = cfs_create_thread(osp_precreate_thread, d, 0);
1218         if (rc < 0) {
1219                 CERROR("can't start precreate thread %d\n", rc);
1220                 RETURN(rc);
1221         }
1222
1223         l_wait_event(d->opd_pre_thread.t_ctl_waitq,
1224                      osp_precreate_running(d) || osp_precreate_stopped(d),
1225                      &lwi);
1226
1227         RETURN(0);
1228 }
1229
1230 void osp_precreate_fini(struct osp_device *d)
1231 {
1232         struct ptlrpc_thread *thread = &d->opd_pre_thread;
1233
1234         ENTRY;
1235
1236         cfs_timer_disarm(&d->opd_statfs_timer);
1237
1238         thread->t_flags = SVC_STOPPING;
1239         cfs_waitq_signal(&d->opd_pre_waitq);
1240
1241         cfs_wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
1242
1243         EXIT;
1244 }
1245