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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/osp/osp_precreate.c
  32  *
  33  * Lustre OST Proxy Device
  34  *
  35  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
  36  * Author: Mikhail Pershin <mike.pershin@intel.com>
  37  * Author: Di Wang <di.wang@intel.com>
  38  */
  39
  40 #define DEBUG_SUBSYSTEM S_MDS
  41
  42 #include <linux/kthread.h>
  43
  44 #include <lustre_obdo.h>
  45
  46 #include "osp_internal.h"
  47
  48 /*
  49  * there are two specific states to take care about:
  50  *
  51  * = import is disconnected =
  52  *
  53  * = import is inactive =
  54  *   in this case osp_declare_create() returns an error
  55  *
  56  */
  57
  58 /**
  59  * Check whether statfs data is expired
  60  *
  61  * OSP device caches statfs data for the target, the function checks
  62  * whether the data is expired or not.
  63  *
  64  * \param[in] d         OSP device
  65  *
  66  * \retval              0 - not expired, 1 - expired
  67  */
  68 static inline int osp_statfs_need_update(struct osp_device *d)
  69 {
  70         return !ktime_before(ktime_get(), d->opd_statfs_fresh_till);
  71 }
  72
  73 /*
  74  * OSP tries to maintain pool of available objects so that calls to create
  75  * objects don't block most of time
  76  *
  77  * each time OSP gets connected to OST, we should start from precreation cleanup
  78  */
  79 static void osp_statfs_timer_cb(cfs_timer_cb_arg_t data)
  80 {
  81         struct osp_device *d = cfs_from_timer(d, data, opd_statfs_timer);
  82
  83         LASSERT(d);
  84         /* invalidate statfs data so osp_precreate_thread() can refresh */
  85         d->opd_statfs_fresh_till = ktime_sub_ns(ktime_get(), NSEC_PER_SEC);
  86         if (d->opd_pre_task)
  87                 wake_up(&d->opd_pre_waitq);
  88 }
  89
  90 static void osp_pre_update_msfs(struct osp_device *d, struct obd_statfs *msfs);
  91
  92 /*
  93  * The function updates current precreation status if broken, and
  94  * updates that cached statfs state if functional, then wakes up waiters.
  95  * We don't clear opd_pre_status directly here, but rather leave this
  96  * to osp_pre_update_msfs() to do if everything is OK so that we don't
  97  * have a race to clear opd_pre_status and then set it to -ENOSPC again.
  98  *
  99  * \param[in] d         OSP device
 100  * \param[in] msfs      statfs data
 101  * \param[in] rc        new precreate status for device \a d
 102  */
 103 static void osp_pre_update_status_msfs(struct osp_device *d,
 104                                        struct obd_statfs *msfs, int rc)
 105 {
 106         CDEBUG(D_INFO, "%s: Updating status = %d\n", d->opd_obd->obd_name, rc);
 107         if (rc)
 108                 d->opd_pre_status = rc;
 109         else
 110                 osp_pre_update_msfs(d, msfs);
 111
 112         wake_up_all(&d->opd_pre_user_waitq);
 113 }
 114
 115 /* Pass in the old statfs data in case the limits have changed */
 116 void osp_pre_update_status(struct osp_device *d, int rc)
 117 {
 118         osp_pre_update_status_msfs(d, &d->opd_statfs, rc);
 119 }
 120
 121
 122 /**
 123  * RPC interpret callback for OST_STATFS RPC
 124  *
 125  * An interpretation callback called by ptlrpc for OST_STATFS RPC when it is
 126  * replied by the target. It's used to maintain statfs cache for the target.
 127  * The function fills data from the reply if successful and schedules another
 128  * update.
 129  *
 130  * \param[in] env       LU environment provided by the caller
 131  * \param[in] req       RPC replied
 132  * \param[in] aa        callback data
 133  * \param[in] rc        RPC result
 134  *
 135  * \retval 0            on success
 136  * \retval negative     negated errno on error
 137  */
 138 static int osp_statfs_interpret(const struct lu_env *env,
 139                                 struct ptlrpc_request *req, void *args, int rc)
 140 {
 141         union ptlrpc_async_args *aa = args;
 142         struct obd_import *imp = req->rq_import;
 143         struct obd_statfs *msfs;
 144         struct obd_statfs *sfs;
 145         struct osp_device *d;
 146         u64 maxage_ns;
 147
 148         ENTRY;
 149
 150         aa = ptlrpc_req_async_args(aa, req);
 151         d = aa->pointer_arg[0];
 152         LASSERT(d);
 153
 154         if (rc != 0)
 155                 GOTO(out, rc);
 156
 157         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
 158         if (msfs == NULL)
 159                 GOTO(out, rc = -EPROTO);
 160
 161         if (d->opd_pre)
 162                 osp_pre_update_status_msfs(d, msfs, 0);
 163         else
 164                 d->opd_statfs = *msfs;
 165
 166         /* schedule next update */
 167         maxage_ns = d->opd_statfs_maxage * NSEC_PER_SEC;
 168         d->opd_statfs_fresh_till = ktime_add_ns(ktime_get(), maxage_ns);
 169         mod_timer(&d->opd_statfs_timer,
 170                   jiffies + cfs_time_seconds(d->opd_statfs_maxage));
 171         d->opd_statfs_update_in_progress = 0;
 172
 173         sfs = &d->opd_statfs;
 174         CDEBUG(D_CACHE, "%s (%p): %llu blocks, %llu free, %llu avail, "
 175                "%u bsize, %u reserved mb low, %u reserved mb high,"
 176                "%llu files, %llu free files\n", d->opd_obd->obd_name, d,
 177                sfs->os_blocks, sfs->os_bfree, sfs->os_bavail, sfs->os_bsize,
 178                d->opd_reserved_mb_low, d->opd_reserved_mb_high,
 179                sfs->os_files, sfs->os_ffree);
 180
 181         RETURN(0);
 182 out:
 183         /* couldn't update statfs, try again with a small delay */
 184         d->opd_statfs_fresh_till = ktime_add_ns(ktime_get(), 10 * NSEC_PER_SEC);
 185         d->opd_statfs_update_in_progress = 0;
 186         if (d->opd_pre && d->opd_pre_task)
 187                 wake_up(&d->opd_pre_waitq);
 188
 189         if (req->rq_import_generation == imp->imp_generation)
 190                 CDEBUG(D_CACHE, "%s: couldn't update statfs: rc = %d\n",
 191                        d->opd_obd->obd_name, rc);
 192         RETURN(rc);
 193 }
 194
 195 /**
 196  * Send OST_STATFS RPC
 197  *
 198  * Sends OST_STATFS RPC to refresh cached statfs data for the target.
 199  * Also disables scheduled updates as times OSP may need to refresh
 200  * statfs data before expiration. The function doesn't block, instead
 201  * an interpretation callback osp_statfs_interpret() is used.
 202  *
 203  * \param[in] d         OSP device
 204  */
 205 static int osp_statfs_update(const struct lu_env *env, struct osp_device *d)
 206 {
 207         u64 expire = obd_timeout * 1000 * NSEC_PER_SEC;
 208         struct ptlrpc_request   *req;
 209         struct obd_import       *imp;
 210         union ptlrpc_async_args *aa;
 211         int rc;
 212
 213         ENTRY;
 214
 215         CDEBUG(D_CACHE, "going to update statfs\n");
 216
 217         imp = d->opd_obd->u.cli.cl_import;
 218         LASSERT(imp);
 219
 220         req = ptlrpc_request_alloc(imp,
 221                            d->opd_pre ? &RQF_OST_STATFS : &RQF_MDS_STATFS);
 222         if (req == NULL)
 223                 RETURN(-ENOMEM);
 224
 225         rc = ptlrpc_request_pack(req,
 226                          d->opd_pre ? LUSTRE_OST_VERSION : LUSTRE_MDS_VERSION,
 227                          d->opd_pre ? OST_STATFS : MDS_STATFS);
 228         if (rc) {
 229                 ptlrpc_request_free(req);
 230                 RETURN(rc);
 231         }
 232         ptlrpc_request_set_replen(req);
 233         if (d->opd_pre)
 234                 req->rq_request_portal = OST_CREATE_PORTAL;
 235         ptlrpc_at_set_req_timeout(req);
 236
 237         req->rq_interpret_reply = osp_statfs_interpret;
 238         aa = ptlrpc_req_async_args(aa, req);
 239         aa->pointer_arg[0] = d;
 240
 241         /*
 242          * no updates till reply
 243          */
 244         del_timer(&d->opd_statfs_timer);
 245         d->opd_statfs_fresh_till = ktime_add_ns(ktime_get(), expire);
 246         d->opd_statfs_update_in_progress = 1;
 247
 248         ptlrpcd_add_req(req);
 249
 250         /* we still want to sync changes if no new changes are coming */
 251         if (ktime_before(ktime_get(), d->opd_sync_next_commit_cb))
 252                 GOTO(out, rc);
 253
 254         if (atomic_read(&d->opd_sync_changes)) {
 255                 struct thandle *th;
 256
 257                 th = dt_trans_create(env, d->opd_storage);
 258                 if (IS_ERR(th)) {
 259                         CERROR("%s: can't sync\n", d->opd_obd->obd_name);
 260                         GOTO(out, rc);
 261                 }
 262                 rc = dt_trans_start_local(env, d->opd_storage, th);
 263                 if (rc == 0) {
 264                         CDEBUG(D_OTHER, "%s: sync forced, %d changes\n",
 265                                d->opd_obd->obd_name,
 266                                atomic_read(&d->opd_sync_changes));
 267                         osp_sync_add_commit_cb_1s(env, d, th);
 268                 }
 269                 dt_trans_stop(env, d->opd_storage, th);
 270         }
 271
 272 out:
 273         RETURN(0);
 274 }
 275
 276 /**
 277  * Schedule an immediate update for statfs data
 278  *
 279  * If cached statfs data claim no free space, but OSP has got a request to
 280  * destroy an object (so release some space probably), then we may need to
 281  * refresh cached statfs data sooner than planned. The function checks there
 282  * is no statfs update going and schedules immediate update if so.
 283  * XXX: there might be a case where removed object(s) do not add free space (empty
 284  * object). If the number of such deletions is high, then we can start to update
 285  * statfs too often causing a RPC storm. some throttling is needed...
 286  *
 287  * \param[in] d         OSP device where statfs data needs to be refreshed
 288  */
 289 void osp_statfs_need_now(struct osp_device *d)
 290 {
 291         if (!d->opd_statfs_update_in_progress) {
 292                 /*
 293                  * if current status is -ENOSPC (lack of free space on OST)
 294                  * then we should poll OST immediately once object destroy
 295                  * is replied
 296                  */
 297                 d->opd_statfs_fresh_till = ktime_sub_ns(ktime_get(), NSEC_PER_SEC);
 298                 del_timer(&d->opd_statfs_timer);
 299                 wake_up(&d->opd_pre_waitq);
 300         }
 301 }
 302
 303 /**
 304  * Return number of precreated objects
 305  *
 306  * A simple helper to calculate the number of precreated objects on the device.
 307  *
 308  * \param[in] env       LU environment provided by the caller
 309  * \param[in] osp       OSP device
 310  *
 311  * \retval              the number of the precreated objects
 312  */
 313 static inline int osp_objs_precreated(const struct lu_env *env,
 314                                       struct osp_device *osp)
 315 {
 316         return osp_fid_diff(&osp->opd_pre_last_created_fid,
 317                             &osp->opd_pre_used_fid);
 318 }
 319
 320 /**
 321  * Check pool of precreated objects is nearly empty
 322  *
 323  * We should not wait till the pool of the precreated objects is exhausted,
 324  * because then there will be a long period of OSP being unavailable for the
 325  * new creations due to lenghty precreate RPC. Instead we ask for another
 326  * precreation ahead and hopefully have it ready before the current pool is
 327  * empty. Notice this function relies on an external locking.
 328  *
 329  * \param[in] env       LU environment provided by the caller
 330  * \param[in] d         OSP device
 331  *
 332  * \retval              0 - current pool is good enough, 1 - time to precreate
 333  */
 334 static inline int osp_precreate_near_empty_nolock(const struct lu_env *env,
 335                                                   struct osp_device *d)
 336 {
 337         int window = osp_objs_precreated(env, d);
 338
 339         /* don't consider new precreation till OST is healty and
 340          * has free space */
 341         return ((window - d->opd_pre_reserved < d->opd_pre_create_count / 2) &&
 342                 (d->opd_pre_status == 0));
 343 }
 344
 345 /**
 346  * Check pool of precreated objects
 347  *
 348  * This is protected version of osp_precreate_near_empty_nolock(), check that
 349  * for the details.
 350  *
 351  * \param[in] env       LU environment provided by the caller
 352  * \param[in] d         OSP device
 353  *
 354  * \retval              0 - current pool is good enough, 1 - time to precreate
 355  */
 356 static inline int osp_precreate_near_empty(const struct lu_env *env,
 357                                            struct osp_device *d)
 358 {
 359         int rc;
 360
 361         if (d->opd_pre == NULL)
 362                 return 0;
 363
 364         /* XXX: do we really need locking here? */
 365         spin_lock(&d->opd_pre_lock);
 366         rc = osp_precreate_near_empty_nolock(env, d);
 367         spin_unlock(&d->opd_pre_lock);
 368         return rc;
 369 }
 370
 371 /**
 372  * Check given sequence is empty
 373  *
 374  * Returns a binary result whether the given sequence has some IDs left
 375  * or not. Find the details in osp_fid_end_seq(). This is a lock protected
 376  * version of that function.
 377  *
 378  * \param[in] env       LU environment provided by the caller
 379  * \param[in] osp       OSP device
 380  *
 381  * \retval              0 - current sequence has no IDs, 1 - otherwise
 382  */
 383 static inline int osp_create_end_seq(const struct lu_env *env,
 384                                      struct osp_device *osp)
 385 {
 386         struct lu_fid *fid = &osp->opd_pre_used_fid;
 387         int rc;
 388
 389         spin_lock(&osp->opd_pre_lock);
 390         rc = osp_fid_end_seq(env, fid);
 391         spin_unlock(&osp->opd_pre_lock);
 392         return rc;
 393 }
 394
 395 /**
 396  * Write FID into into last_oid/last_seq file
 397  *
 398  * The function stores the sequence and the in-sequence id into two dedicated
 399  * files. The sync argument can be used to request synchronous commit, so the
 400  * function won't return until the updates are committed.
 401  *
 402  * \param[in] env       LU environment provided by the caller
 403  * \param[in] osp       OSP device
 404  * \param[in] fid       fid where sequence/id is taken
 405  * \param[in] sync      update mode: 0 - asynchronously, 1 - synchronously
 406  *
 407  * \retval 0            on success
 408  * \retval negative     negated errno on error
 409  **/
 410 int osp_write_last_oid_seq_files(struct lu_env *env, struct osp_device *osp,
 411                                  struct lu_fid *fid, int sync)
 412 {
 413         struct osp_thread_info  *oti = osp_env_info(env);
 414         struct lu_buf      *lb_oid = &oti->osi_lb;
 415         struct lu_buf      *lb_oseq = &oti->osi_lb2;
 416         loff_t             oid_off;
 417         u64                oid;
 418         loff_t             oseq_off;
 419         struct thandle    *th;
 420         int                   rc;
 421         ENTRY;
 422
 423         if (osp->opd_storage->dd_rdonly)
 424                 RETURN(0);
 425
 426         /* Note: through f_oid is only 32 bits, it will also write 64 bits
 427          * for oid to keep compatibility with the previous version. */
 428         oid = fid->f_oid;
 429         osp_objid_buf_prep(lb_oid, &oid_off,
 430                            &oid, osp->opd_index);
 431
 432         osp_objseq_buf_prep(lb_oseq, &oseq_off,
 433                             &fid->f_seq, osp->opd_index);
 434
 435         th = dt_trans_create(env, osp->opd_storage);
 436         if (IS_ERR(th))
 437                 RETURN(PTR_ERR(th));
 438
 439         th->th_sync |= sync;
 440         rc = dt_declare_record_write(env, osp->opd_last_used_oid_file,
 441                                      lb_oid, oid_off, th);
 442         if (rc != 0)
 443                 GOTO(out, rc);
 444
 445         rc = dt_declare_record_write(env, osp->opd_last_used_seq_file,
 446                                      lb_oseq, oseq_off, th);
 447         if (rc != 0)
 448                 GOTO(out, rc);
 449
 450         rc = dt_trans_start_local(env, osp->opd_storage, th);
 451         if (rc != 0)
 452                 GOTO(out, rc);
 453
 454         rc = dt_record_write(env, osp->opd_last_used_oid_file, lb_oid,
 455                              &oid_off, th);
 456         if (rc != 0) {
 457                 CERROR("%s: can not write to last seq file: rc = %d\n",
 458                         osp->opd_obd->obd_name, rc);
 459                 GOTO(out, rc);
 460         }
 461         rc = dt_record_write(env, osp->opd_last_used_seq_file, lb_oseq,
 462                              &oseq_off, th);
 463         if (rc) {
 464                 CERROR("%s: can not write to last seq file: rc = %d\n",
 465                         osp->opd_obd->obd_name, rc);
 466                 GOTO(out, rc);
 467         }
 468 out:
 469         dt_trans_stop(env, osp->opd_storage, th);
 470         RETURN(rc);
 471 }
 472
 473 /**
 474  * Switch to another sequence
 475  *
 476  * When a current sequence has no available IDs left, OSP has to switch to
 477  * another new sequence. OSP requests it using the regular FLDB protocol
 478  * and stores synchronously before that is used in precreated. This is needed
 479  * to basically have the sequences referenced (not orphaned), otherwise it's
 480  * possible that OST has some objects precreated and the clients have data
 481  * written to it, but after MDT failover nobody refers those objects and OSP
 482  * has no idea that the sequence need cleanup to be done.
 483  * While this is very expensive operation, it's supposed to happen very very
 484  * infrequently because sequence has 2^32 or 2^48 objects (depending on type)
 485  *
 486  * \param[in] env       LU environment provided by the caller
 487  * \param[in] osp       OSP device
 488  *
 489  * \retval 0            on success
 490  * \retval negative     negated errno on error
 491  */
 492 static int osp_precreate_rollover_new_seq(struct lu_env *env,
 493                                           struct osp_device *osp)
 494 {
 495         struct lu_fid   *fid = &osp_env_info(env)->osi_fid;
 496         struct lu_fid   *last_fid = &osp->opd_last_used_fid;
 497         int             rc;
 498         ENTRY;
 499
 500         rc = seq_client_get_seq(env, osp->opd_obd->u.cli.cl_seq, &fid->f_seq);
 501         if (rc != 0) {
 502                 CERROR("%s: alloc fid error: rc = %d\n",
 503                        osp->opd_obd->obd_name, rc);
 504                 RETURN(rc);
 505         }
 506
 507         fid->f_oid = 1;
 508         fid->f_ver = 0;
 509         LASSERTF(fid_seq(fid) != fid_seq(last_fid),
 510                  "fid "DFID", last_fid "DFID"\n", PFID(fid),
 511                  PFID(last_fid));
 512
 513         rc = osp_write_last_oid_seq_files(env, osp, fid, 1);
 514         if (rc != 0) {
 515                 CERROR("%s: Can not update oid/seq file: rc = %d\n",
 516                        osp->opd_obd->obd_name, rc);
 517                 RETURN(rc);
 518         }
 519
 520         LCONSOLE_INFO("%s: update sequence from %#llx to %#llx\n",
 521                       osp->opd_obd->obd_name, fid_seq(last_fid),
 522                       fid_seq(fid));
 523         /* Update last_xxx to the new seq */
 524         spin_lock(&osp->opd_pre_lock);
 525         osp->opd_last_used_fid = *fid;
 526         osp_fid_to_obdid(fid, &osp->opd_last_id);
 527         osp->opd_gap_start_fid = *fid;
 528         osp->opd_pre_used_fid = *fid;
 529         osp->opd_pre_last_created_fid = *fid;
 530         spin_unlock(&osp->opd_pre_lock);
 531
 532         RETURN(rc);
 533 }
 534
 535 /**
 536  * Find IDs available in current sequence
 537  *
 538  * The function calculates the highest possible ID and the number of IDs
 539  * available in the current sequence OSP is using. The number is limited
 540  * artifically by the caller (grow param) and the number of IDs available
 541  * in the sequence by nature. The function doesn't require an external
 542  * locking.
 543  *
 544  * \param[in] env       LU environment provided by the caller
 545  * \param[in] osp       OSP device
 546  * \param[in] fid       FID the caller wants to start with
 547  * \param[in] grow      how many the caller wants
 548  * \param[out] fid      the highest calculated FID
 549  * \param[out] grow     the number of available IDs calculated
 550  *
 551  * \retval              0 on success, 1 - the sequence is empty
 552  */
 553 static int osp_precreate_fids(const struct lu_env *env, struct osp_device *osp,
 554                               struct lu_fid *fid, int *grow)
 555 {
 556         struct osp_thread_info  *osi = osp_env_info(env);
 557         __u64                   end;
 558         int                     i = 0;
 559
 560         if (fid_is_idif(fid)) {
 561                 struct lu_fid   *last_fid;
 562                 struct ost_id   *oi = &osi->osi_oi;
 563                 int rc;
 564
 565                 spin_lock(&osp->opd_pre_lock);
 566                 last_fid = &osp->opd_pre_last_created_fid;
 567                 fid_to_ostid(last_fid, oi);
 568                 end = min(ostid_id(oi) + *grow, IDIF_MAX_OID);
 569                 *grow = end - ostid_id(oi);
 570                 rc = ostid_set_id(oi, ostid_id(oi) + *grow);
 571                 spin_unlock(&osp->opd_pre_lock);
 572
 573                 if (*grow == 0 || rc)
 574                         return 1;
 575
 576                 ostid_to_fid(fid, oi, osp->opd_index);
 577                 return 0;
 578         }
 579
 580         spin_lock(&osp->opd_pre_lock);
 581         *fid = osp->opd_pre_last_created_fid;
 582         end = fid->f_oid;
 583         end = min((end + *grow), (__u64)LUSTRE_DATA_SEQ_MAX_WIDTH);
 584         *grow = end - fid->f_oid;
 585         fid->f_oid += end - fid->f_oid;
 586         spin_unlock(&osp->opd_pre_lock);
 587
 588         CDEBUG(D_INFO, "Expect %d, actual %d ["DFID" -- "DFID"]\n",
 589                *grow, i, PFID(fid), PFID(&osp->opd_pre_last_created_fid));
 590
 591         return *grow > 0 ? 0 : 1;
 592 }
 593
 594 /**
 595  * Prepare and send precreate RPC
 596  *
 597  * The function finds how many objects should be precreated.  Then allocates,
 598  * prepares and schedules precreate RPC synchronously. Upon reply the function
 599  * wakes up the threads waiting for the new objects on this target. If the
 600  * target wasn't able to create all the objects requested, then the next
 601  * precreate will be asking for fewer objects (i.e. slow precreate down).
 602  *
 603  * \param[in] env       LU environment provided by the caller
 604  * \param[in] d         OSP device
 605  *
 606  * \retval 0            on success
 607  * \retval negative     negated errno on error
 608  **/
 609 static int osp_precreate_send(const struct lu_env *env, struct osp_device *d)
 610 {
 611         struct osp_thread_info  *oti = osp_env_info(env);
 612         struct ptlrpc_request   *req;
 613         struct obd_import       *imp;
 614         struct ost_body         *body;
 615         int                      rc, grow, diff;
 616         struct lu_fid           *fid = &oti->osi_fid;
 617         ENTRY;
 618
 619         /* don't precreate new objects till OST healthy and has free space */
 620         if (unlikely(d->opd_pre_status)) {
 621                 CDEBUG(D_INFO, "%s: don't send new precreate: rc = %d\n",
 622                        d->opd_obd->obd_name, d->opd_pre_status);
 623                 RETURN(0);
 624         }
 625
 626         /*
 627          * if not connection/initialization is compeleted, ignore
 628          */
 629         imp = d->opd_obd->u.cli.cl_import;
 630         LASSERT(imp);
 631
 632         req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
 633         if (req == NULL)
 634                 RETURN(-ENOMEM);
 635         req->rq_request_portal = OST_CREATE_PORTAL;
 636         /* we should not resend create request - anyway we will have delorphan
 637          * and kill these objects */
 638         req->rq_no_delay = req->rq_no_resend = 1;
 639
 640         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 641         if (rc) {
 642                 ptlrpc_request_free(req);
 643                 RETURN(rc);
 644         }
 645
 646         spin_lock(&d->opd_pre_lock);
 647         if (d->opd_pre_create_count > d->opd_pre_max_create_count / 2)
 648                 d->opd_pre_create_count = d->opd_pre_max_create_count / 2;
 649         grow = d->opd_pre_create_count;
 650         spin_unlock(&d->opd_pre_lock);
 651
 652         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 653         LASSERT(body);
 654
 655         *fid = d->opd_pre_last_created_fid;
 656         rc = osp_precreate_fids(env, d, fid, &grow);
 657         if (rc == 1)
 658                 /* Current seq has been used up*/
 659                 GOTO(out_req, rc = -ENOSPC);
 660
 661         if (!osp_is_fid_client(d)) {
 662                 /* Non-FID client will always send seq 0 because of
 663                  * compatiblity */
 664                 LASSERTF(fid_is_idif(fid), "Invalid fid "DFID"\n", PFID(fid));
 665                 fid->f_seq = 0;
 666         }
 667
 668         fid_to_ostid(fid, &body->oa.o_oi);
 669         body->oa.o_valid = OBD_MD_FLGROUP;
 670
 671         ptlrpc_request_set_replen(req);
 672
 673         if (OBD_FAIL_CHECK(OBD_FAIL_OSP_FAKE_PRECREATE))
 674                 GOTO(ready, rc = 0);
 675
 676         rc = ptlrpc_queue_wait(req);
 677         if (rc) {
 678                 CERROR("%s: can't precreate: rc = %d\n", d->opd_obd->obd_name,
 679                        rc);
 680                 if (req->rq_net_err)
 681                         /* have osp_precreate_reserve() to wait for repeat */
 682                         rc = -ENOTCONN;
 683                 GOTO(out_req, rc);
 684         }
 685         LASSERT(req->rq_transno == 0);
 686
 687         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 688         if (body == NULL)
 689                 GOTO(out_req, rc = -EPROTO);
 690
 691         ostid_to_fid(fid, &body->oa.o_oi, d->opd_index);
 692
 693 ready:
 694         if (osp_fid_diff(fid, &d->opd_pre_used_fid) <= 0) {
 695                 CERROR("%s: precreate fid "DFID" <= local used fid "DFID
 696                        ": rc = %d\n", d->opd_obd->obd_name,
 697                        PFID(fid), PFID(&d->opd_pre_used_fid), -ESTALE);
 698                 GOTO(out_req, rc = -ESTALE);
 699         }
 700
 701         diff = osp_fid_diff(fid, &d->opd_pre_last_created_fid);
 702
 703         spin_lock(&d->opd_pre_lock);
 704         if (diff < grow) {
 705                 /* the OST has not managed to create all the
 706                  * objects we asked for */
 707                 d->opd_pre_create_count = max(diff, OST_MIN_PRECREATE);
 708                 d->opd_pre_create_slow = 1;
 709         } else {
 710                 /* the OST is able to keep up with the work,
 711                  * we could consider increasing create_count
 712                  * next time if needed */
 713                 d->opd_pre_create_slow = 0;
 714         }
 715
 716         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 717         fid_to_ostid(fid, &body->oa.o_oi);
 718
 719         d->opd_pre_last_created_fid = *fid;
 720         spin_unlock(&d->opd_pre_lock);
 721
 722         CDEBUG(D_HA, "%s: current precreated pool: "DFID"-"DFID"\n",
 723                d->opd_obd->obd_name, PFID(&d->opd_pre_used_fid),
 724                PFID(&d->opd_pre_last_created_fid));
 725 out_req:
 726         /* now we can wakeup all users awaiting for objects */
 727         osp_pre_update_status(d, rc);
 728
 729         /* pause to let osp_precreate_reserve to go first */
 730         CFS_FAIL_TIMEOUT(OBD_FAIL_OSP_PRECREATE_PAUSE, 2);
 731
 732         ptlrpc_req_finished(req);
 733         RETURN(rc);
 734 }
 735
 736 /**
 737  * Get last precreated object from target (OST)
 738  *
 739  * Sends synchronous RPC to the target (OST) to learn the last precreated
 740  * object. This later is used to remove all unused objects (cleanup orphan
 741  * procedure). Also, the next object after one we got will be used as a
 742  * starting point for the new precreates.
 743  *
 744  * \param[in] env       LU environment provided by the caller
 745  * \param[in] d         OSP device
 746  *
 747  * \retval 0            on success
 748  * \retval negative     negated errno on error
 749  **/
 750 static int osp_get_lastfid_from_ost(const struct lu_env *env,
 751                                     struct osp_device *d)
 752 {
 753         struct ptlrpc_request   *req = NULL;
 754         struct obd_import       *imp;
 755         struct lu_fid           *last_fid;
 756         char                    *tmp;
 757         int                     rc;
 758         ENTRY;
 759
 760         imp = d->opd_obd->u.cli.cl_import;
 761         LASSERT(imp);
 762
 763         req = ptlrpc_request_alloc(imp, &RQF_OST_GET_INFO_LAST_FID);
 764         if (req == NULL)
 765                 RETURN(-ENOMEM);
 766
 767         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY, RCL_CLIENT,
 768                              sizeof(KEY_LAST_FID));
 769
 770         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
 771         if (rc) {
 772                 ptlrpc_request_free(req);
 773                 RETURN(rc);
 774         }
 775
 776         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
 777         memcpy(tmp, KEY_LAST_FID, sizeof(KEY_LAST_FID));
 778
 779         req->rq_no_delay = req->rq_no_resend = 1;
 780         last_fid = req_capsule_client_get(&req->rq_pill, &RMF_FID);
 781         fid_cpu_to_le(last_fid, &d->opd_last_used_fid);
 782
 783         ptlrpc_request_set_replen(req);
 784
 785         rc = ptlrpc_queue_wait(req);
 786         if (rc) {
 787                 /* -EFAULT means reading LAST_FID failed (see ofd_get_info_hld),
 788                  * let sysadm sort this * out.
 789                  */
 790                 if (rc == -EFAULT)
 791                         ptlrpc_set_import_active(imp, 0);
 792                 GOTO(out, rc);
 793         }
 794
 795         last_fid = req_capsule_server_get(&req->rq_pill, &RMF_FID);
 796         if (last_fid == NULL) {
 797                 CERROR("%s: Got last_fid failed.\n", d->opd_obd->obd_name);
 798                 GOTO(out, rc = -EPROTO);
 799         }
 800
 801         if (!fid_is_sane(last_fid)) {
 802                 CERROR("%s: Got insane last_fid "DFID"\n",
 803                        d->opd_obd->obd_name, PFID(last_fid));
 804                 GOTO(out, rc = -EPROTO);
 805         }
 806
 807         /* Only update the last used fid, if the OST has objects for
 808          * this sequence, i.e. fid_oid > 0 */
 809         if (fid_oid(last_fid) > 0)
 810                 d->opd_last_used_fid = *last_fid;
 811
 812         CDEBUG(D_HA, "%s: Got last_fid "DFID"\n", d->opd_obd->obd_name,
 813                PFID(last_fid));
 814
 815 out:
 816         ptlrpc_req_finished(req);
 817         RETURN(rc);
 818 }
 819
 820 /**
 821  * Cleanup orphans on OST
 822  *
 823  * This function is called in a contex of a dedicated thread handling
 824  * all the precreation suff. The function waits till local recovery
 825  * is complete, then identify all the unreferenced objects (orphans)
 826  * using the highest ID referenced by a local and the highest object
 827  * precreated by the target. The found range is a subject to removal
 828  * using specially flagged RPC. During this process OSP is marked
 829  * unavailable for new objects.
 830  *
 831  * \param[in] env       LU environment provided by the caller
 832  * \param[in] d         OSP device
 833  *
 834  * \retval 0            on success
 835  * \retval negative     negated errno on error
 836  */
 837 static int osp_precreate_cleanup_orphans(struct lu_env *env,
 838                                          struct osp_device *d)
 839 {
 840         struct osp_thread_info  *osi = osp_env_info(env);
 841         struct lu_fid           *last_fid = &osi->osi_fid;
 842         struct ptlrpc_request   *req = NULL;
 843         struct obd_import       *imp;
 844         struct ost_body         *body;
 845         int                      update_status = 0;
 846         int                      rc;
 847         int                      diff;
 848
 849         ENTRY;
 850
 851         /*
 852          * wait for local recovery to finish, so we can cleanup orphans
 853          * orphans are all objects since "last used" (assigned), but
 854          * there might be objects reserved and in some cases they won't
 855          * be used. we can't cleanup them till we're sure they won't be
 856          * used. also can't we allow new reservations because they may
 857          * end up getting orphans being cleaned up below. so we block
 858          * new reservations and wait till all reserved objects either
 859          * user or released.
 860          */
 861         spin_lock(&d->opd_pre_lock);
 862         d->opd_pre_recovering = 1;
 863         spin_unlock(&d->opd_pre_lock);
 864         /*
 865          * The locking above makes sure the opd_pre_reserved check below will
 866          * catch all osp_precreate_reserve() calls who find
 867          * "!opd_pre_recovering".
 868          */
 869         wait_event_idle(d->opd_pre_waitq,
 870                         (!d->opd_pre_reserved && d->opd_recovery_completed) ||
 871                         !d->opd_pre_task || d->opd_got_disconnected);
 872         if (!d->opd_pre_task || d->opd_got_disconnected)
 873                 GOTO(out, rc = -EAGAIN);
 874
 875         CDEBUG(D_HA, "%s: going to cleanup orphans since "DFID"\n",
 876                d->opd_obd->obd_name, PFID(&d->opd_last_used_fid));
 877
 878         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_DELAY_DELORPHAN, cfs_fail_val);
 879
 880         *last_fid = d->opd_last_used_fid;
 881         /* The OSP should already get the valid seq now */
 882         LASSERT(!fid_is_zero(last_fid));
 883         if (fid_oid(&d->opd_last_used_fid) < 2 ||
 884             OBD_FAIL_CHECK(OBD_FAIL_OSP_GET_LAST_FID)) {
 885                 /* lastfid looks strange... ask OST */
 886                 rc = osp_get_lastfid_from_ost(env, d);
 887                 if (rc)
 888                         GOTO(out, rc);
 889         }
 890
 891         imp = d->opd_obd->u.cli.cl_import;
 892         LASSERT(imp);
 893
 894         req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
 895         if (req == NULL)
 896                 GOTO(out, rc = -ENOMEM);
 897
 898         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 899         if (rc) {
 900                 ptlrpc_request_free(req);
 901                 req = NULL;
 902                 GOTO(out, rc);
 903         }
 904
 905         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 906         if (body == NULL)
 907                 GOTO(out, rc = -EPROTO);
 908
 909         body->oa.o_flags = OBD_FL_DELORPHAN;
 910         body->oa.o_valid = OBD_MD_FLFLAGS | OBD_MD_FLGROUP;
 911
 912         fid_to_ostid(&d->opd_last_used_fid, &body->oa.o_oi);
 913
 914         ptlrpc_request_set_replen(req);
 915
 916         /* Don't resend the delorphan req */
 917         req->rq_no_resend = req->rq_no_delay = 1;
 918
 919         rc = ptlrpc_queue_wait(req);
 920         if (rc) {
 921                 update_status = 1;
 922                 GOTO(out, rc);
 923         }
 924
 925         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 926         if (body == NULL)
 927                 GOTO(out, rc = -EPROTO);
 928
 929         /*
 930          * OST provides us with id new pool starts from in body->oa.o_id
 931          */
 932         ostid_to_fid(last_fid, &body->oa.o_oi, d->opd_index);
 933
 934         spin_lock(&d->opd_pre_lock);
 935         diff = osp_fid_diff(&d->opd_last_used_fid, last_fid);
 936         if (diff > 0) {
 937                 d->opd_pre_create_count = OST_MIN_PRECREATE + diff;
 938                 d->opd_pre_last_created_fid = d->opd_last_used_fid;
 939         } else {
 940                 d->opd_pre_create_count = OST_MIN_PRECREATE;
 941                 d->opd_pre_last_created_fid = *last_fid;
 942         }
 943         /*
 944          * This empties the pre-creation pool and effectively blocks any new
 945          * reservations.
 946          */
 947         LASSERT(fid_oid(&d->opd_pre_last_created_fid) <=
 948                 LUSTRE_DATA_SEQ_MAX_WIDTH);
 949         d->opd_pre_used_fid = d->opd_pre_last_created_fid;
 950         d->opd_pre_create_slow = 0;
 951         spin_unlock(&d->opd_pre_lock);
 952
 953         CDEBUG(D_HA, "%s: Got last_id "DFID" from OST, last_created "DFID
 954                "last_used is "DFID"\n", d->opd_obd->obd_name, PFID(last_fid),
 955                PFID(&d->opd_pre_last_created_fid), PFID(&d->opd_last_used_fid));
 956 out:
 957         if (req)
 958                 ptlrpc_req_finished(req);
 959
 960
 961         /*
 962          * If rc is zero, the pre-creation window should have been emptied.
 963          * Since waking up the herd would be useless without pre-created
 964          * objects, we defer the signal to osp_precreate_send() in that case.
 965          */
 966         if (rc != 0) {
 967                 if (update_status) {
 968                         CERROR("%s: cannot cleanup orphans: rc = %d\n",
 969                                d->opd_obd->obd_name, rc);
 970                         /* we can't proceed from here, OST seem to
 971                          * be in a bad shape, better to wait for
 972                          * a new instance of the server and repeat
 973                          * from the beginning. notify possible waiters
 974                          * this OSP isn't quite functional yet */
 975                         osp_pre_update_status(d, rc);
 976                 } else {
 977                         wake_up_all(&d->opd_pre_user_waitq);
 978                 }
 979         } else {
 980                 spin_lock(&d->opd_pre_lock);
 981                 d->opd_pre_recovering = 0;
 982                 spin_unlock(&d->opd_pre_lock);
 983         }
 984
 985         RETURN(rc);
 986 }
 987
 988 /**
 989  * Update precreate status using statfs data
 990  *
 991  * The function decides whether this OSP should be used for new objects.
 992  * IOW, whether this OST is used up or has some free space. Cached statfs
 993  * data is used to make this decision. If the latest result of statfs
 994  * request (rc argument) is not success, then just mark OSP unavailable
 995  * right away.
 996  *
 997  * The new statfs data is passed in \a msfs and needs to be stored into
 998  * opd_statfs, but only after the various flags in os_state are set, so
 999  * that the new statfs data is not visible without appropriate flags set.
1000  * As such, there is no need to clear the flags here, since this is called
1001  * with new statfs data, and they should not be cleared if sent from OST.
1002  *
1003  * Add a bit of hysteresis so this flag isn't continually flapping, and
1004  * ensure that new files don't get extremely fragmented due to only a
1005  * small amount of available space in the filesystem.  We want to set
1006  * the ENOSPC/ENOINO flags unconditionally when there is less than the
1007  * reserved size free, and still copy them from the old state when there
1008  * is less than 2*reserved size free space or inodes.
1009  *
1010  * \param[in] d         OSP device
1011  * \param[in] msfs      statfs data
1012  */
1013 static void osp_pre_update_msfs(struct osp_device *d, struct obd_statfs *msfs)
1014 {
1015         u32 old_state = d->opd_statfs.os_state;
1016         u32 reserved_ino_low = 32;      /* could be tunable in the future */
1017         u32 reserved_ino_high = reserved_ino_low * 2;
1018         u64 available_mb;
1019
1020         /* statfs structure not initialized yet */
1021         if (unlikely(!msfs->os_type))
1022                 return;
1023
1024         /* if the low and high watermarks have not been initialized yet */
1025         if (unlikely(d->opd_reserved_mb_high == 0 &&
1026                      d->opd_reserved_mb_low == 0)) {
1027                 /* Use ~0.1% by default to disable object allocation,
1028                  * and ~0.2% to enable, size in MB, set both watermark
1029                  */
1030                 spin_lock(&d->opd_pre_lock);
1031                 if (d->opd_reserved_mb_high == 0 &&
1032                     d->opd_reserved_mb_low == 0) {
1033                         d->opd_reserved_mb_low = ((msfs->os_bsize >> 10) *
1034                                                   msfs->os_blocks) >> 20;
1035                         if (d->opd_reserved_mb_low == 0)
1036                                 d->opd_reserved_mb_low = 1;
1037                         d->opd_reserved_mb_high =
1038                                 (d->opd_reserved_mb_low << 1) + 1;
1039                 }
1040                 spin_unlock(&d->opd_pre_lock);
1041         }
1042
1043         available_mb = (msfs->os_bavail * (msfs->os_bsize >> 10)) >> 10;
1044         if (msfs->os_ffree < reserved_ino_low)
1045                 msfs->os_state |= OS_STATFS_ENOINO;
1046         else if (msfs->os_ffree <= reserved_ino_high)
1047                 msfs->os_state |= old_state & OS_STATFS_ENOINO;
1048         /* else don't clear flags in new msfs->os_state sent from OST */
1049
1050         CDEBUG(D_INFO,
1051                "%s: blocks=%llu free=%llu avail=%llu avail_mb=%llu hwm_mb=%u files=%llu ffree=%llu state=%x: rc = %d\n",
1052                d->opd_obd->obd_name, msfs->os_blocks, msfs->os_bfree,
1053                msfs->os_bavail, available_mb, d->opd_reserved_mb_high,
1054                msfs->os_files, msfs->os_ffree, msfs->os_state,
1055                d->opd_pre_status);
1056         if (available_mb < d->opd_reserved_mb_low)
1057                 msfs->os_state |= OS_STATFS_ENOSPC;
1058         else if (available_mb <= d->opd_reserved_mb_high)
1059                 msfs->os_state |= old_state & OS_STATFS_ENOSPC;
1060         /* else don't clear flags in new msfs->os_state sent from OST */
1061
1062         if (msfs->os_state & (OS_STATFS_ENOINO | OS_STATFS_ENOSPC)) {
1063                 d->opd_pre_status = -ENOSPC;
1064                 if (!(old_state & (OS_STATFS_ENOINO | OS_STATFS_ENOSPC)))
1065                         CDEBUG(D_INFO, "%s: full: state=%x: rc = %x\n",
1066                                d->opd_obd->obd_name, msfs->os_state,
1067                                d->opd_pre_status);
1068                 CDEBUG(D_INFO, "uncommitted changes=%u in_progress=%u\n",
1069                        atomic_read(&d->opd_sync_changes),
1070                        atomic_read(&d->opd_sync_rpcs_in_progress));
1071         } else if (old_state & (OS_STATFS_ENOINO | OS_STATFS_ENOSPC)) {
1072                 d->opd_pre_status = 0;
1073                 spin_lock(&d->opd_pre_lock);
1074                 d->opd_pre_create_slow = 0;
1075                 d->opd_pre_create_count = OST_MIN_PRECREATE;
1076                 spin_unlock(&d->opd_pre_lock);
1077                 wake_up(&d->opd_pre_waitq);
1078
1079                 CDEBUG(D_INFO,
1080                        "%s: available: state=%x: rc = %d\n",
1081                        d->opd_obd->obd_name, msfs->os_state,
1082                        d->opd_pre_status);
1083         } else {
1084                 /* we only get here if rc == 0 in the caller */
1085                 d->opd_pre_status = 0;
1086         }
1087
1088         /* Object precreation skipped on OST if manually disabled */
1089         if (d->opd_pre_max_create_count == 0)
1090                 msfs->os_state |= OS_STATFS_NOPRECREATE;
1091         /* else don't clear flags in new msfs->os_state sent from OST */
1092
1093         /* copy only new statfs state to make it visible to MDS threads */
1094         if (&d->opd_statfs != msfs)
1095                 d->opd_statfs = *msfs;
1096 }
1097
1098 /**
1099  * Initialize FID for precreation
1100  *
1101  * For a just created new target, a new sequence should be taken.
1102  * The function checks there is no IDIF in use (if the target was
1103  * added with the older version of Lustre), then requests a new
1104  * sequence from FLDB using the regular protocol. Then this new
1105  * sequence is stored on a persisten storage synchronously to prevent
1106  * possible object leakage (for the detail see the description for
1107  * osp_precreate_rollover_new_seq()).
1108  *
1109  * \param[in] osp       OSP device
1110  *
1111  * \retval 0            on success
1112  * \retval negative     negated errno on error
1113  */
1114 int osp_init_pre_fid(struct osp_device *osp)
1115 {
1116         struct lu_env           env;
1117         struct osp_thread_info  *osi;
1118         struct lu_client_seq    *cli_seq;
1119         struct lu_fid           *last_fid;
1120         int                     rc;
1121         ENTRY;
1122
1123         LASSERT(osp->opd_pre != NULL);
1124
1125         /* Let's check if the current last_seq/fid is valid,
1126          * otherwise request new sequence from the controller */
1127         if (osp_is_fid_client(osp) && osp->opd_group != 0) {
1128                 /* Non-MDT0 can only use normal sequence for
1129                  * OST objects */
1130                 if (fid_is_norm(&osp->opd_last_used_fid))
1131                         RETURN(0);
1132         } else {
1133                 /* Initially MDT0 will start with IDIF, after
1134                  * that it will request new sequence from the
1135                  * controller */
1136                 if (fid_is_idif(&osp->opd_last_used_fid) ||
1137                     fid_is_norm(&osp->opd_last_used_fid))
1138                         RETURN(0);
1139         }
1140
1141         if (!fid_is_zero(&osp->opd_last_used_fid))
1142                 CWARN("%s: invalid last used fid "DFID
1143                       ", try to get new sequence.\n",
1144                       osp->opd_obd->obd_name,
1145                       PFID(&osp->opd_last_used_fid));
1146
1147         rc = lu_env_init(&env, osp->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
1148         if (rc) {
1149                 CERROR("%s: init env error: rc = %d\n",
1150                        osp->opd_obd->obd_name, rc);
1151                 RETURN(rc);
1152         }
1153
1154         osi = osp_env_info(&env);
1155         last_fid = &osi->osi_fid;
1156         fid_zero(last_fid);
1157         /* For a freshed fs, it will allocate a new sequence first */
1158         if (osp_is_fid_client(osp) && osp->opd_group != 0) {
1159                 cli_seq = osp->opd_obd->u.cli.cl_seq;
1160                 rc = seq_client_get_seq(&env, cli_seq, &last_fid->f_seq);
1161                 if (rc != 0) {
1162                         CERROR("%s: alloc fid error: rc = %d\n",
1163                                osp->opd_obd->obd_name, rc);
1164                         GOTO(out, rc);
1165                 }
1166         } else {
1167                 last_fid->f_seq = fid_idif_seq(0, osp->opd_index);
1168         }
1169         last_fid->f_oid = 1;
1170         last_fid->f_ver = 0;
1171
1172         spin_lock(&osp->opd_pre_lock);
1173         osp->opd_last_used_fid = *last_fid;
1174         osp->opd_pre_used_fid = *last_fid;
1175         osp->opd_pre_last_created_fid = *last_fid;
1176         spin_unlock(&osp->opd_pre_lock);
1177         rc = osp_write_last_oid_seq_files(&env, osp, last_fid, 1);
1178         if (rc != 0) {
1179                 CERROR("%s: write fid error: rc = %d\n",
1180                        osp->opd_obd->obd_name, rc);
1181                 GOTO(out, rc);
1182         }
1183 out:
1184         lu_env_fini(&env);
1185         RETURN(rc);
1186 }
1187
1188 struct opt_args {
1189         struct osp_device       *opta_dev;
1190         struct lu_env           opta_env;
1191         struct completion       *opta_started;
1192 };
1193 /**
1194  * The core of precreate functionality
1195  *
1196  * The function implements the main precreation loop. Basically it
1197  * involves connecting to the target, precerate FID initialization,
1198  * identifying and removing orphans, then serving precreation. As
1199  * part of the latter, the thread is responsible for statfs data
1200  * updates. The precreation is mostly driven by another threads
1201  * asking for new OST objects - those askers wake the thread when
1202  * the number of precreated objects reach low watermark.
1203  * After a disconnect, the sequence above repeats. This is keep going
1204  * until the thread is requested to stop.
1205  *
1206  * \param[in] _arg      private data the thread (OSP device to handle)
1207  *
1208  * \retval 0            on success
1209  * \retval negative     negated errno on error
1210  */
1211 static int osp_precreate_thread(void *_args)
1212 {
1213         struct opt_args         *args = _args;
1214         struct osp_device       *d = args->opta_dev;
1215         struct lu_env           *env = &args->opta_env;
1216         int                      rc;
1217
1218         ENTRY;
1219
1220         complete(args->opta_started);
1221         while (!kthread_should_stop()) {
1222                 /*
1223                  * need to be connected to OST
1224                  */
1225                 while (!kthread_should_stop()) {
1226                         if ((d->opd_pre == NULL || d->opd_pre_recovering) &&
1227                             d->opd_imp_connected &&
1228                             !d->opd_got_disconnected)
1229                                 break;
1230                         wait_event_idle(d->opd_pre_waitq,
1231                                         kthread_should_stop() ||
1232                                         d->opd_new_connection);
1233
1234                         if (!d->opd_new_connection)
1235                                 continue;
1236
1237                         OBD_FAIL_TIMEOUT(OBD_FAIL_OSP_CON_EVENT_DELAY,
1238                                          cfs_fail_val);
1239                         d->opd_new_connection = 0;
1240                         d->opd_got_disconnected = 0;
1241                         break;
1242                 }
1243
1244                 if (kthread_should_stop())
1245                         break;
1246
1247                 if (d->opd_pre) {
1248                         LASSERT(d->opd_obd->u.cli.cl_seq != NULL);
1249                         /* Sigh, fid client is not ready yet */
1250                         if (d->opd_obd->u.cli.cl_seq->lcs_exp == NULL)
1251                                 continue;
1252
1253                         /* Init fid for osp_precreate if necessary */
1254                         rc = osp_init_pre_fid(d);
1255                         if (rc != 0) {
1256                                 class_export_put(d->opd_exp);
1257                                 d->opd_obd->u.cli.cl_seq->lcs_exp = NULL;
1258                                 CERROR("%s: init pre fid error: rc = %d\n",
1259                                                 d->opd_obd->obd_name, rc);
1260                                 continue;
1261                         }
1262                 }
1263
1264                 if (osp_statfs_update(env, d)) {
1265                         if (wait_event_idle_timeout(d->opd_pre_waitq,
1266                                                     kthread_should_stop(),
1267                                                     cfs_time_seconds(5)) == 0)
1268                                 l_wait_event_abortable(
1269                                         d->opd_pre_waitq,
1270                                         kthread_should_stop());
1271                         continue;
1272                 }
1273
1274                 if (d->opd_pre) {
1275                         /*
1276                          * Clean up orphans or recreate missing objects.
1277                          */
1278                         rc = osp_precreate_cleanup_orphans(env, d);
1279                         if (rc != 0) {
1280                                 schedule_timeout_interruptible(cfs_time_seconds(1));
1281                                 continue;
1282                         }
1283                 }
1284
1285                 /*
1286                  * connected, can handle precreates now
1287                  */
1288                 while (!kthread_should_stop()) {
1289                         wait_event_idle(d->opd_pre_waitq,
1290                                         kthread_should_stop() ||
1291                                         osp_precreate_near_empty(env, d) ||
1292                                         osp_statfs_need_update(d) ||
1293                                         d->opd_got_disconnected);
1294
1295                         if (kthread_should_stop())
1296                                 break;
1297
1298                         /* something happened to the connection
1299                          * have to start from the beginning */
1300                         if (d->opd_got_disconnected)
1301                                 break;
1302
1303                         if (osp_statfs_need_update(d))
1304                                 if (osp_statfs_update(env, d))
1305                                         break;
1306
1307                         if (d->opd_pre == NULL)
1308                                 continue;
1309
1310                         if (OBD_FAIL_CHECK(OBD_FAIL_OSP_GET_LAST_FID)) {
1311                                 d->opd_pre_recovering = 1;
1312                                 break;
1313                         }
1314
1315                         /* To avoid handling different seq in precreate/orphan
1316                          * cleanup, it will hold precreate until current seq is
1317                          * used up. */
1318                         if (unlikely(osp_precreate_end_seq(env, d) &&
1319                             !osp_create_end_seq(env, d)))
1320                                 continue;
1321
1322                         if (unlikely(osp_precreate_end_seq(env, d) &&
1323                                      osp_create_end_seq(env, d))) {
1324                                 LCONSOLE_INFO("%s:%#llx is used up."
1325                                               " Update to new seq\n",
1326                                               d->opd_obd->obd_name,
1327                                          fid_seq(&d->opd_pre_last_created_fid));
1328                                 rc = osp_precreate_rollover_new_seq(env, d);
1329                                 if (rc)
1330                                         continue;
1331                         }
1332
1333                         if (osp_precreate_near_empty(env, d)) {
1334                                 rc = osp_precreate_send(env, d);
1335                                 /* osp_precreate_send() sets opd_pre_status
1336                                  * in case of error, that prevent the using of
1337                                  * failed device. */
1338                                 if (rc < 0 && rc != -ENOSPC &&
1339                                     rc != -ETIMEDOUT && rc != -ENOTCONN)
1340                                         CERROR("%s: cannot precreate objects:"
1341                                                " rc = %d\n",
1342                                                d->opd_obd->obd_name, rc);
1343                         }
1344                 }
1345         }
1346
1347         lu_env_fini(env);
1348         OBD_FREE_PTR(args);
1349
1350         RETURN(0);
1351 }
1352
1353 /**
1354  * Check when to stop to wait for precreate objects.
1355  *
1356  * The caller wanting a new OST object can't wait undefinitely. The
1357  * function checks for few conditions including available new OST
1358  * objects, disconnected OST, lack of space with no pending destroys,
1359  * etc. IOW, it checks whether the current OSP state is good to keep
1360  * waiting or it's better to give up.
1361  *
1362  * \param[in] env       LU environment provided by the caller
1363  * \param[in] d         OSP device
1364  *
1365  * \retval              0 - keep waiting, 1 - no luck
1366  */
1367 static int osp_precreate_ready_condition(const struct lu_env *env,
1368                                          struct osp_device *d)
1369 {
1370         /* Bail out I/O fails to OST */
1371         if (d->opd_pre_status != 0 &&
1372             d->opd_pre_status != -EAGAIN &&
1373             d->opd_pre_status != -ENODEV &&
1374             d->opd_pre_status != -ENOTCONN &&
1375             d->opd_pre_status != -ENOSPC) {
1376                 /* DEBUG LU-3230 */
1377                 if (d->opd_pre_status != -EIO)
1378                         CERROR("%s: precreate failed opd_pre_status %d\n",
1379                                d->opd_obd->obd_name, d->opd_pre_status);
1380                 return 1;
1381         }
1382
1383         if (d->opd_pre_recovering)
1384                 return 0;
1385
1386         /* ready if got enough precreated objects */
1387         /* we need to wait for others (opd_pre_reserved) and our object (+1) */
1388         if (d->opd_pre_reserved + 1 < osp_objs_precreated(env, d))
1389                 return 1;
1390
1391         /* ready if OST reported no space and no destroys in progress */
1392         if (atomic_read(&d->opd_sync_changes) +
1393             atomic_read(&d->opd_sync_rpcs_in_progress) == 0 &&
1394             d->opd_pre_status == -ENOSPC)
1395                 return 1;
1396
1397         return 0;
1398 }
1399
1400 /**
1401  * Reserve object in precreate pool
1402  *
1403  * When the caller wants to create a new object on this target (target
1404  * represented by the given OSP), it should declare this intention using
1405  * a regular ->dt_declare_create() OSD API method. Then OSP will be trying
1406  * to reserve an object in the existing precreated pool or wait up to
1407  * obd_timeout for the available object to appear in the pool (a dedicated
1408  * thread will be doing real precreation in background). The object can be
1409  * consumed later with osp_precreate_get_fid() or be released with call to
1410  * lu_object_put(). Notice the function doesn't reserve a specific ID, just
1411  * some ID. The actual ID assignment happen in osp_precreate_get_fid().
1412  * If the space on the target is short and there is a pending object destroy,
1413  * then the function forces local commit to speedup space release (see
1414  * osp_sync.c for the details).
1415  *
1416  * \param[in] env       LU environment provided by the caller
1417  * \param[in] d         OSP device
1418  *
1419  * \retval              0 on success
1420  * \retval              -ENOSPC when no space on OST
1421  * \retval              -EAGAIN try later, slow precreation in progress
1422  * \retval              -EIO when no access to OST
1423  */
1424 int osp_precreate_reserve(const struct lu_env *env, struct osp_device *d,
1425                           bool can_block)
1426 {
1427         time64_t expire = ktime_get_seconds() + obd_timeout;
1428         int precreated, rc, synced = 0;
1429
1430         ENTRY;
1431
1432         LASSERTF(osp_objs_precreated(env, d) >= 0, "Last created FID "DFID
1433                  "Next FID "DFID"\n", PFID(&d->opd_pre_last_created_fid),
1434                  PFID(&d->opd_pre_used_fid));
1435
1436         /* opd_pre_max_create_count 0 to not use specified OST. */
1437         if (d->opd_pre_max_create_count == 0)
1438                 RETURN(-ENOBUFS);
1439
1440         /*
1441          * wait till:
1442          *  - preallocation is done
1443          *  - no free space expected soon
1444          *  - can't connect to OST for too long (obd_timeout)
1445          *  - OST can allocate fid sequence.
1446          */
1447         while ((rc = d->opd_pre_status) == 0 || rc == -ENOSPC ||
1448                 rc == -ENODEV || rc == -EAGAIN || rc == -ENOTCONN) {
1449
1450                 /*
1451                  * increase number of precreations
1452                  */
1453                 precreated = osp_objs_precreated(env, d);
1454                 if (d->opd_pre_create_count < d->opd_pre_max_create_count &&
1455                     d->opd_pre_create_slow == 0 &&
1456                     precreated <= (d->opd_pre_create_count / 4 + 1)) {
1457                         spin_lock(&d->opd_pre_lock);
1458                         d->opd_pre_create_slow = 1;
1459                         d->opd_pre_create_count *= 2;
1460                         spin_unlock(&d->opd_pre_lock);
1461                 }
1462
1463                 spin_lock(&d->opd_pre_lock);
1464                 precreated = osp_objs_precreated(env, d);
1465                 if (precreated > d->opd_pre_reserved &&
1466                     !d->opd_pre_recovering) {
1467                         d->opd_pre_reserved++;
1468                         spin_unlock(&d->opd_pre_lock);
1469                         rc = 0;
1470
1471                         /* XXX: don't wake up if precreation is in progress */
1472                         if (osp_precreate_near_empty_nolock(env, d) &&
1473                            !osp_precreate_end_seq_nolock(env, d))
1474                                 wake_up(&d->opd_pre_waitq);
1475
1476                         break;
1477                 }
1478                 spin_unlock(&d->opd_pre_lock);
1479
1480                 /*
1481                  * all precreated objects have been used and no-space
1482                  * status leave us no chance to succeed very soon
1483                  * but if there is destroy in progress, then we should
1484                  * wait till that is done - some space might be released
1485                  */
1486                 if (unlikely(rc == -ENOSPC)) {
1487                         if (atomic_read(&d->opd_sync_changes) && synced == 0) {
1488                                 /* force local commit to release space */
1489                                 dt_commit_async(env, d->opd_storage);
1490                                 osp_sync_check_for_work(d);
1491                                 synced = 1;
1492                         }
1493                         if (atomic_read(&d->opd_sync_rpcs_in_progress)) {
1494                                 /* just wait till destroys are done
1495                                  * see wait_event_idle_timeout() below
1496                                  */
1497                         }
1498                         if (atomic_read(&d->opd_sync_changes) +
1499                             atomic_read(&d->opd_sync_rpcs_in_progress) == 0) {
1500                                 /* no hope for free space */
1501                                 break;
1502                         }
1503                 }
1504
1505                 /* XXX: don't wake up if precreation is in progress */
1506                 wake_up(&d->opd_pre_waitq);
1507
1508                 if (ktime_get_seconds() >= expire) {
1509                         rc = -ETIMEDOUT;
1510                         break;
1511                 }
1512
1513                 if (!can_block) {
1514                         LASSERT(d->opd_pre);
1515                         rc = -ENOBUFS;
1516                         break;
1517                 }
1518
1519                 CDEBUG(D_INFO, "%s: Sleeping on objects\n",
1520                        d->opd_obd->obd_name);
1521                 if (wait_event_idle_timeout(
1522                             d->opd_pre_user_waitq,
1523                             osp_precreate_ready_condition(env, d),
1524                             cfs_time_seconds(obd_timeout)) == 0) {
1525                         CDEBUG(D_HA,
1526                                "%s: slow creates, last="DFID", next="DFID", "
1527                                "reserved=%llu, sync_changes=%u, "
1528                                "sync_rpcs_in_progress=%d, status=%d\n",
1529                                d->opd_obd->obd_name,
1530                                PFID(&d->opd_pre_last_created_fid),
1531                                PFID(&d->opd_pre_used_fid), d->opd_pre_reserved,
1532                                atomic_read(&d->opd_sync_changes),
1533                                atomic_read(&d->opd_sync_rpcs_in_progress),
1534                                d->opd_pre_status);
1535                 } else {
1536                         CDEBUG(D_INFO, "%s: Waked up, status=%d\n",
1537                                d->opd_obd->obd_name, d->opd_pre_status);
1538                 }
1539         }
1540
1541         RETURN(rc);
1542 }
1543
1544 /**
1545  * Get a FID from precreation pool
1546  *
1547  * The function is a companion for osp_precreate_reserve() - it assigns
1548  * a specific FID from the precreate. The function should be called only
1549  * if the call to osp_precreate_reserve() was successful. The function
1550  * updates a local storage to remember the highest object ID referenced
1551  * by the node in the given sequence.
1552  *
1553  * A very importan details: this is supposed to be called once the
1554  * transaction is started, so on-disk update will be atomic with the
1555  * data (like LOVEA) refering this object. Then the object won't be leaked:
1556  * either it's referenced by the committed transaction or it's a subject
1557  * to the orphan cleanup procedure.
1558  *
1559  * \param[in] env       LU environment provided by the caller
1560  * \param[in] d         OSP device
1561  * \param[out] fid      generated FID
1562  *
1563  * \retval 0            on success
1564  * \retval negative     negated errno on error
1565  */
1566 int osp_precreate_get_fid(const struct lu_env *env, struct osp_device *d,
1567                           struct lu_fid *fid)
1568 {
1569         struct lu_fid *pre_used_fid = &d->opd_pre_used_fid;
1570         /* grab next id from the pool */
1571         spin_lock(&d->opd_pre_lock);
1572
1573         LASSERTF(osp_fid_diff(&d->opd_pre_used_fid,
1574                              &d->opd_pre_last_created_fid) < 0,
1575                  "next fid "DFID" last created fid "DFID"\n",
1576                  PFID(&d->opd_pre_used_fid),
1577                  PFID(&d->opd_pre_last_created_fid));
1578
1579         /*
1580          * When sequence is used up, new one should be allocated in
1581          * osp_precreate_rollover_new_seq. So ASSERT here to avoid
1582          * objid overflow.
1583          */
1584         LASSERTF(osp_fid_end_seq(env, pre_used_fid) == 0,
1585                  "next fid "DFID" last created fid "DFID"\n",
1586                  PFID(&d->opd_pre_used_fid),
1587                  PFID(&d->opd_pre_last_created_fid));
1588         /* Non IDIF fids shoulnd't get here with oid == 0xFFFFFFFF. */
1589         if (fid_is_idif(pre_used_fid) &&
1590             unlikely(fid_oid(pre_used_fid) == LUSTRE_DATA_SEQ_MAX_WIDTH))
1591                 pre_used_fid->f_seq++;
1592
1593         d->opd_pre_used_fid.f_oid++;
1594         memcpy(fid, &d->opd_pre_used_fid, sizeof(*fid));
1595         d->opd_pre_reserved--;
1596         /*
1597          * last_used_id must be changed along with getting new id otherwise
1598          * we might miscalculate gap causing object loss or leak
1599          */
1600         osp_update_last_fid(d, fid);
1601         spin_unlock(&d->opd_pre_lock);
1602
1603         /*
1604          * probably main thread suspended orphan cleanup till
1605          * all reservations are released, see comment in
1606          * osp_precreate_thread() just before orphan cleanup
1607          */
1608         if (unlikely(d->opd_pre_reserved == 0 &&
1609                      (d->opd_pre_recovering || d->opd_pre_status)))
1610                 wake_up(&d->opd_pre_waitq);
1611
1612         return 0;
1613 }
1614
1615 /*
1616  * Set size regular attribute on an object
1617  *
1618  * When a striping is created late, it's possible that size is already
1619  * initialized on the file. Then the new striping should inherit size
1620  * from the file. The function sets size on the object using the regular
1621  * protocol (OST_PUNCH).
1622  * XXX: should be re-implemented using OUT ?
1623  *
1624  * \param[in] env       LU environment provided by the caller
1625  * \param[in] dt        object
1626  * \param[in] size      size to set.
1627  *
1628  * \retval 0            on success
1629  * \retval negative     negated errno on error
1630  */
1631 int osp_object_truncate(const struct lu_env *env, struct dt_object *dt,
1632                         __u64 size)
1633 {
1634         struct osp_device       *d = lu2osp_dev(dt->do_lu.lo_dev);
1635         struct ptlrpc_request   *req = NULL;
1636         struct obd_import       *imp;
1637         struct ost_body         *body;
1638         struct obdo             *oa = NULL;
1639         int                      rc;
1640
1641         ENTRY;
1642
1643         imp = d->opd_obd->u.cli.cl_import;
1644         LASSERT(imp);
1645
1646         req = ptlrpc_request_alloc(imp, &RQF_OST_PUNCH);
1647         if (req == NULL)
1648                 RETURN(-ENOMEM);
1649
1650         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
1651         if (rc) {
1652                 ptlrpc_request_free(req);
1653                 RETURN(rc);
1654         }
1655
1656         /*
1657          * XXX: decide how do we do here with resend
1658          * if we don't resend, then client may see wrong file size
1659          * if we do resend, then MDS thread can get stuck for quite long
1660          * and if we don't resend, then client will also get -EAGAIN !!
1661          * (see LU-7975 and sanity/test_27F use cases)
1662          * but let's decide not to resend/delay this truncate request to OST
1663          * and allow Client to decide to resend, in a less agressive way from
1664          * after_reply(), by returning -EINPROGRESS instead of
1665          * -EAGAIN/-EAGAIN upon return from ptlrpc_queue_wait() at the
1666          * end of this routine
1667          */
1668         req->rq_no_resend = req->rq_no_delay = 1;
1669
1670         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1671         ptlrpc_at_set_req_timeout(req);
1672
1673         OBD_ALLOC_PTR(oa);
1674         if (oa == NULL)
1675                 GOTO(out, rc = -ENOMEM);
1676
1677         rc = fid_to_ostid(lu_object_fid(&dt->do_lu), &oa->o_oi);
1678         LASSERT(rc == 0);
1679         oa->o_size = size;
1680         oa->o_blocks = OBD_OBJECT_EOF;
1681         oa->o_valid = OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
1682                       OBD_MD_FLID | OBD_MD_FLGROUP;
1683
1684         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
1685         LASSERT(body);
1686         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
1687
1688         /* XXX: capa support? */
1689         /* osc_pack_capa(req, body, capa); */
1690
1691         ptlrpc_request_set_replen(req);
1692
1693         rc = ptlrpc_queue_wait(req);
1694         if (rc) {
1695                 /* -EAGAIN/-EWOULDBLOCK means OST is unreachable at the moment
1696                  * since we have decided not to resend/delay, but this could
1697                  * lead to wrong size to be seen at Client side and even process
1698                  * trying to open to exit/fail if not itself handling -EAGAIN.
1699                  * So it should be better to return -EINPROGRESS instead and
1700                  * leave the decision to resend at Client side in after_reply()
1701                  */
1702                 if (rc == -EAGAIN) {
1703                         rc = -EINPROGRESS;
1704                         CDEBUG(D_HA, "returning -EINPROGRESS instead of "
1705                                "-EWOULDBLOCK/-EAGAIN to allow Client to "
1706                                "resend\n");
1707                 } else {
1708                         CERROR("can't punch object: %d\n", rc);
1709                 }
1710         }
1711 out:
1712         ptlrpc_req_finished(req);
1713         if (oa)
1714                 OBD_FREE_PTR(oa);
1715         RETURN(rc);
1716 }
1717
1718 /**
1719  * Initialize precreation functionality of OSP
1720  *
1721  * Prepares all the internal structures and starts the precreate thread
1722  *
1723  * \param[in] d         OSP device
1724  *
1725  * \retval 0            on success
1726  * \retval negative     negated errno on error
1727  */
1728 int osp_init_precreate(struct osp_device *d)
1729 {
1730         ENTRY;
1731
1732         OBD_ALLOC_PTR(d->opd_pre);
1733         if (d->opd_pre == NULL)
1734                 RETURN(-ENOMEM);
1735
1736         /* initially precreation isn't ready */
1737         init_waitqueue_head(&d->opd_pre_user_waitq);
1738         d->opd_pre_status = -EAGAIN;
1739         fid_zero(&d->opd_pre_used_fid);
1740         d->opd_pre_used_fid.f_oid = 1;
1741         fid_zero(&d->opd_pre_last_created_fid);
1742         d->opd_pre_last_created_fid.f_oid = 1;
1743         d->opd_last_id = 0;
1744         d->opd_pre_reserved = 0;
1745         d->opd_got_disconnected = 1;
1746         d->opd_pre_create_slow = 0;
1747         d->opd_pre_create_count = OST_MIN_PRECREATE;
1748         d->opd_pre_min_create_count = OST_MIN_PRECREATE;
1749         d->opd_pre_max_create_count = OST_MAX_PRECREATE;
1750         d->opd_reserved_mb_high = 0;
1751         d->opd_reserved_mb_low = 0;
1752
1753         RETURN(0);
1754 }
1755
1756 /**
1757  * Finish precreate functionality of OSP
1758  *
1759  *
1760  * Asks all the activity (the thread, update timer) to stop, then
1761  * wait till that is done.
1762  *
1763  * \param[in] d         OSP device
1764  */
1765 void osp_precreate_fini(struct osp_device *d)
1766 {
1767         ENTRY;
1768
1769         if (d->opd_pre == NULL)
1770                 RETURN_EXIT;
1771
1772         OBD_FREE_PTR(d->opd_pre);
1773         d->opd_pre = NULL;
1774
1775         EXIT;
1776 }
1777
1778 int osp_init_statfs(struct osp_device *d)
1779 {
1780         struct task_struct      *task;
1781         struct opt_args         *args;
1782         DECLARE_COMPLETION_ONSTACK(started);
1783         int                     rc;
1784
1785         ENTRY;
1786
1787         spin_lock_init(&d->opd_pre_lock);
1788         init_waitqueue_head(&d->opd_pre_waitq);
1789
1790         /*
1791          * Initialize statfs-related things
1792          */
1793         d->opd_statfs_maxage = 5; /* defaultupdate interval */
1794         d->opd_statfs_fresh_till = ktime_sub_ns(ktime_get(),
1795                                                 1000 * NSEC_PER_SEC);
1796         CDEBUG(D_OTHER, "current %lldns, fresh till %lldns\n",
1797                ktime_get_ns(),
1798                ktime_to_ns(d->opd_statfs_fresh_till));
1799         cfs_timer_setup(&d->opd_statfs_timer, osp_statfs_timer_cb,
1800                         (unsigned long)d, 0);
1801
1802         if (d->opd_storage->dd_rdonly)
1803                 RETURN(0);
1804
1805         OBD_ALLOC_PTR(args);
1806         if (!args)
1807                 RETURN(0);
1808         args->opta_dev = d;
1809         args->opta_started = &started;
1810         rc = lu_env_init(&args->opta_env,
1811                          d->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
1812         if (rc) {
1813                 CERROR("%s: init env error: rc = %d\n", d->opd_obd->obd_name,
1814                        rc);
1815                 OBD_FREE_PTR(args);
1816                 RETURN(0);
1817         }
1818
1819         /*
1820          * start thread handling precreation and statfs updates
1821          */
1822         task = kthread_create(osp_precreate_thread, args,
1823                               "osp-pre-%u-%u", d->opd_index, d->opd_group);
1824         if (IS_ERR(task)) {
1825                 CERROR("can't start precreate thread %ld\n", PTR_ERR(task));
1826                 lu_env_fini(&args->opta_env);
1827                 OBD_FREE_PTR(args);
1828                 RETURN(PTR_ERR(task));
1829         }
1830         d->opd_pre_task = task;
1831         wake_up_process(task);
1832         wait_for_completion(&started);
1833
1834         RETURN(0);
1835 }
1836
1837 void osp_statfs_fini(struct osp_device *d)
1838 {
1839         struct task_struct *task = d->opd_pre_task;
1840         ENTRY;
1841
1842         del_timer(&d->opd_statfs_timer);
1843
1844         d->opd_pre_task = NULL;
1845         if (task)
1846                 kthread_stop(task);
1847
1848         EXIT;
1849 }