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, 2013, 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 #define DEBUG_SUBSYSTEM S_MDS
  46
  47 #include "osp_internal.h"
  48
  49 /*
  50  * there are two specific states to take care about:
  51  *
  52  * = import is disconnected =
  53  *
  54  * = import is inactive =
  55  *   in this case osp_declare_object_create() returns an error
  56  *
  57  */
  58
  59 /*
  60  * statfs
  61  */
  62 static inline int osp_statfs_need_update(struct osp_device *d)
  63 {
  64         return !cfs_time_before(cfs_time_current(),
  65                                 d->opd_statfs_fresh_till);
  66 }
  67
  68 /*
  69  * OSP tries to maintain pool of available objects so that calls to create
  70  * objects don't block most of time
  71  *
  72  * each time OSP gets connected to OST, we should start from precreation cleanup
  73  */
  74 static inline bool osp_precreate_running(struct osp_device *d)
  75 {
  76         return !!(d->opd_pre_thread.t_flags & SVC_RUNNING);
  77 }
  78
  79 static inline bool osp_precreate_stopped(struct osp_device *d)
  80 {
  81         return !!(d->opd_pre_thread.t_flags & SVC_STOPPED);
  82 }
  83
  84 static void osp_statfs_timer_cb(unsigned long _d)
  85 {
  86         struct osp_device *d = (struct osp_device *) _d;
  87
  88         LASSERT(d);
  89         if (d->opd_pre != NULL && osp_precreate_running(d))
  90                 wake_up(&d->opd_pre_waitq);
  91 }
  92
  93 static int osp_statfs_interpret(const struct lu_env *env,
  94                                 struct ptlrpc_request *req,
  95                                 union ptlrpc_async_args *aa, int rc)
  96 {
  97         struct obd_import       *imp = req->rq_import;
  98         struct obd_statfs       *msfs;
  99         struct osp_device       *d;
 100
 101         ENTRY;
 102
 103         aa = ptlrpc_req_async_args(req);
 104         d = aa->pointer_arg[0];
 105         LASSERT(d);
 106
 107         if (rc != 0)
 108                 GOTO(out, rc);
 109
 110         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
 111         if (msfs == NULL)
 112                 GOTO(out, rc = -EPROTO);
 113
 114         d->opd_statfs = *msfs;
 115
 116         osp_pre_update_status(d, rc);
 117
 118         /* schedule next update */
 119         d->opd_statfs_fresh_till = cfs_time_shift(d->opd_statfs_maxage);
 120         cfs_timer_arm(&d->opd_statfs_timer, d->opd_statfs_fresh_till);
 121         d->opd_statfs_update_in_progress = 0;
 122
 123         CDEBUG(D_CACHE, "updated statfs %p\n", d);
 124
 125         RETURN(0);
 126 out:
 127         /* couldn't update statfs, try again as soon as possible */
 128         if (d->opd_pre != NULL && osp_precreate_running(d))
 129                 wake_up(&d->opd_pre_waitq);
 130
 131         if (req->rq_import_generation == imp->imp_generation)
 132                 CDEBUG(D_CACHE, "%s: couldn't update statfs: rc = %d\n",
 133                        d->opd_obd->obd_name, rc);
 134         RETURN(rc);
 135 }
 136
 137 static int osp_statfs_update(struct osp_device *d)
 138 {
 139         struct ptlrpc_request   *req;
 140         struct obd_import       *imp;
 141         union ptlrpc_async_args *aa;
 142         int                      rc;
 143
 144         ENTRY;
 145
 146         CDEBUG(D_CACHE, "going to update statfs\n");
 147
 148         imp = d->opd_obd->u.cli.cl_import;
 149         LASSERT(imp);
 150
 151         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
 152         if (req == NULL)
 153                 RETURN(-ENOMEM);
 154
 155         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
 156         if (rc) {
 157                 ptlrpc_request_free(req);
 158                 RETURN(rc);
 159         }
 160         ptlrpc_request_set_replen(req);
 161         req->rq_request_portal = OST_CREATE_PORTAL;
 162         ptlrpc_at_set_req_timeout(req);
 163
 164         req->rq_interpret_reply = (ptlrpc_interpterer_t)osp_statfs_interpret;
 165         aa = ptlrpc_req_async_args(req);
 166         aa->pointer_arg[0] = d;
 167
 168         /*
 169          * no updates till reply
 170          */
 171         cfs_timer_disarm(&d->opd_statfs_timer);
 172         d->opd_statfs_fresh_till = cfs_time_shift(obd_timeout * 1000);
 173         d->opd_statfs_update_in_progress = 1;
 174
 175         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
 176
 177         RETURN(0);
 178 }
 179
 180 /*
 181  * XXX: there might be a case where removed object(s) do not add free
 182  * space (empty object). if the number of such deletions is high, then
 183  * we can start to update statfs too often - a rpc storm
 184  * TODO: some throttling is needed
 185  */
 186 void osp_statfs_need_now(struct osp_device *d)
 187 {
 188         if (!d->opd_statfs_update_in_progress) {
 189                 /*
 190                  * if current status is -ENOSPC (lack of free space on OST)
 191                  * then we should poll OST immediately once object destroy
 192                  * is replied
 193                  */
 194                 d->opd_statfs_fresh_till = cfs_time_shift(-1);
 195                 cfs_timer_disarm(&d->opd_statfs_timer);
 196                 wake_up(&d->opd_pre_waitq);
 197         }
 198 }
 199
 200 static inline int osp_objs_precreated(const struct lu_env *env,
 201                                       struct osp_device *osp)
 202 {
 203         return osp_fid_diff(&osp->opd_pre_last_created_fid,
 204                             &osp->opd_pre_used_fid);
 205 }
 206
 207 static inline int osp_precreate_near_empty_nolock(const struct lu_env *env,
 208                                                   struct osp_device *d)
 209 {
 210         int window = osp_objs_precreated(env, d);
 211
 212         /* don't consider new precreation till OST is healty and
 213          * has free space */
 214         return ((window - d->opd_pre_reserved < d->opd_pre_grow_count / 2) &&
 215                 (d->opd_pre_status == 0));
 216 }
 217
 218 static inline int osp_precreate_near_empty(const struct lu_env *env,
 219                                            struct osp_device *d)
 220 {
 221         int rc;
 222
 223         /* XXX: do we really need locking here? */
 224         spin_lock(&d->opd_pre_lock);
 225         rc = osp_precreate_near_empty_nolock(env, d);
 226         spin_unlock(&d->opd_pre_lock);
 227         return rc;
 228 }
 229
 230 static inline int osp_create_end_seq(const struct lu_env *env,
 231                                      struct osp_device *osp)
 232 {
 233         struct lu_fid *fid = &osp->opd_pre_used_fid;
 234         int rc;
 235
 236         spin_lock(&osp->opd_pre_lock);
 237         rc = osp_fid_end_seq(env, fid);
 238         spin_unlock(&osp->opd_pre_lock);
 239         return rc;
 240 }
 241
 242 /**
 243  * Write fid into last_oid/last_seq file.
 244  **/
 245 int osp_write_last_oid_seq_files(struct lu_env *env, struct osp_device *osp,
 246                                  struct lu_fid *fid, int sync)
 247 {
 248         struct osp_thread_info  *oti = osp_env_info(env);
 249         struct lu_buf      *lb_oid = &oti->osi_lb;
 250         struct lu_buf      *lb_oseq = &oti->osi_lb2;
 251         loff_t             oid_off;
 252         loff_t             oseq_off;
 253         struct thandle    *th;
 254         int                   rc;
 255         ENTRY;
 256
 257         /* Note: through f_oid is only 32bits, it will also write
 258          * 64 bits for oid to keep compatiblity with the previous
 259          * version. */
 260         lb_oid->lb_buf = &fid->f_oid;
 261         lb_oid->lb_len = sizeof(obd_id);
 262         oid_off = sizeof(obd_id) * osp->opd_index;
 263
 264         lb_oseq->lb_buf = &fid->f_seq;
 265         lb_oseq->lb_len = sizeof(obd_id);
 266         oseq_off = sizeof(obd_id) * osp->opd_index;
 267
 268         th = dt_trans_create(env, osp->opd_storage);
 269         if (IS_ERR(th))
 270                 RETURN(PTR_ERR(th));
 271
 272         th->th_sync |= sync;
 273         rc = dt_declare_record_write(env, osp->opd_last_used_oid_file,
 274                                      lb_oid, oid_off, th);
 275         if (rc != 0)
 276                 GOTO(out, rc);
 277
 278         rc = dt_declare_record_write(env, osp->opd_last_used_seq_file,
 279                                      lb_oseq, oseq_off, th);
 280         if (rc != 0)
 281                 GOTO(out, rc);
 282
 283         rc = dt_trans_start_local(env, osp->opd_storage, th);
 284         if (rc != 0)
 285                 GOTO(out, rc);
 286
 287         rc = dt_record_write(env, osp->opd_last_used_oid_file, lb_oid,
 288                              &oid_off, th);
 289         if (rc != 0) {
 290                 CERROR("%s: can not write to last seq file: rc = %d\n",
 291                         osp->opd_obd->obd_name, rc);
 292                 GOTO(out, rc);
 293         }
 294         rc = dt_record_write(env, osp->opd_last_used_seq_file, lb_oseq,
 295                              &oseq_off, th);
 296         if (rc) {
 297                 CERROR("%s: can not write to last seq file: rc = %d\n",
 298                         osp->opd_obd->obd_name, rc);
 299                 GOTO(out, rc);
 300         }
 301 out:
 302         dt_trans_stop(env, osp->opd_storage, th);
 303         RETURN(rc);
 304 }
 305
 306 int osp_precreate_rollover_new_seq(struct lu_env *env, struct osp_device *osp)
 307 {
 308         struct lu_fid   *fid = &osp_env_info(env)->osi_fid;
 309         struct lu_fid   *last_fid = &osp->opd_last_used_fid;
 310         int             rc;
 311         ENTRY;
 312
 313         rc = seq_client_get_seq(env, osp->opd_obd->u.cli.cl_seq, &fid->f_seq);
 314         if (rc != 0) {
 315                 CERROR("%s: alloc fid error: rc = %d\n",
 316                        osp->opd_obd->obd_name, rc);
 317                 RETURN(rc);
 318         }
 319
 320         fid->f_oid = 1;
 321         fid->f_ver = 0;
 322         LASSERTF(fid_seq(fid) != fid_seq(last_fid),
 323                  "fid "DFID", last_fid "DFID"\n", PFID(fid),
 324                  PFID(last_fid));
 325
 326         rc = osp_write_last_oid_seq_files(env, osp, fid, 1);
 327         if (rc != 0) {
 328                 CERROR("%s: Can not update oid/seq file: rc = %d\n",
 329                        osp->opd_obd->obd_name, rc);
 330                 RETURN(rc);
 331         }
 332
 333         LCONSOLE_INFO("%s: update sequence from "LPX64" to "LPX64"\n",
 334                       osp->opd_obd->obd_name, fid_seq(last_fid),
 335                       fid_seq(fid));
 336         /* Update last_xxx to the new seq */
 337         spin_lock(&osp->opd_pre_lock);
 338         osp->opd_last_used_fid = *fid;
 339         osp->opd_gap_start_fid = *fid;
 340         osp->opd_pre_used_fid = *fid;
 341         osp->opd_pre_last_created_fid = *fid;
 342         spin_unlock(&osp->opd_pre_lock);
 343
 344         RETURN(rc);
 345 }
 346
 347 /**
 348  * alloc fids for precreation.
 349  * rc = 0 Success, @grow is the count of real allocation.
 350  * rc = 1 Current seq is used up.
 351  * rc < 0 Other error.
 352  **/
 353 static int osp_precreate_fids(const struct lu_env *env, struct osp_device *osp,
 354                               struct lu_fid *fid, int *grow)
 355 {
 356         struct osp_thread_info  *osi = osp_env_info(env);
 357         __u64                   end;
 358         int                     i = 0;
 359
 360         if (fid_is_idif(fid)) {
 361                 struct lu_fid   *last_fid;
 362                 struct ost_id   *oi = &osi->osi_oi;
 363
 364                 spin_lock(&osp->opd_pre_lock);
 365                 last_fid = &osp->opd_pre_last_created_fid;
 366                 fid_to_ostid(last_fid, oi);
 367                 end = min(ostid_id(oi) + *grow, IDIF_MAX_OID);
 368                 *grow = end - ostid_id(oi);
 369                 ostid_set_id(oi, ostid_id(oi) + *grow);
 370                 spin_unlock(&osp->opd_pre_lock);
 371
 372                 if (*grow == 0)
 373                         return 1;
 374
 375                 ostid_to_fid(fid, oi, osp->opd_index);
 376                 return 0;
 377         }
 378
 379         spin_lock(&osp->opd_pre_lock);
 380         *fid = osp->opd_pre_last_created_fid;
 381         end = fid->f_oid;
 382         end = min((end + *grow), (__u64)LUSTRE_DATA_SEQ_MAX_WIDTH);
 383         *grow = end - fid->f_oid;
 384         fid->f_oid += end - fid->f_oid;
 385         spin_unlock(&osp->opd_pre_lock);
 386
 387         CDEBUG(D_INFO, "Expect %d, actual %d ["DFID" -- "DFID"]\n",
 388                *grow, i, PFID(fid), PFID(&osp->opd_pre_last_created_fid));
 389
 390         return *grow > 0 ? 0 : 1;
 391 }
 392
 393 static int osp_precreate_send(const struct lu_env *env, struct osp_device *d)
 394 {
 395         struct osp_thread_info  *oti = osp_env_info(env);
 396         struct ptlrpc_request   *req;
 397         struct obd_import       *imp;
 398         struct ost_body         *body;
 399         int                      rc, grow, diff;
 400         struct lu_fid           *fid = &oti->osi_fid;
 401         ENTRY;
 402
 403         /* don't precreate new objects till OST healthy and has free space */
 404         if (unlikely(d->opd_pre_status)) {
 405                 CDEBUG(D_INFO, "%s: don't send new precreate: rc = %d\n",
 406                        d->opd_obd->obd_name, d->opd_pre_status);
 407                 RETURN(0);
 408         }
 409
 410         /*
 411          * if not connection/initialization is compeleted, ignore
 412          */
 413         imp = d->opd_obd->u.cli.cl_import;
 414         LASSERT(imp);
 415
 416         req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
 417         if (req == NULL)
 418                 RETURN(-ENOMEM);
 419         req->rq_request_portal = OST_CREATE_PORTAL;
 420         /* we should not resend create request - anyway we will have delorphan
 421          * and kill these objects */
 422         req->rq_no_delay = req->rq_no_resend = 1;
 423
 424         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 425         if (rc) {
 426                 ptlrpc_request_free(req);
 427                 RETURN(rc);
 428         }
 429
 430         spin_lock(&d->opd_pre_lock);
 431         if (d->opd_pre_grow_count > d->opd_pre_max_grow_count / 2)
 432                 d->opd_pre_grow_count = d->opd_pre_max_grow_count / 2;
 433         grow = d->opd_pre_grow_count;
 434         spin_unlock(&d->opd_pre_lock);
 435
 436         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 437         LASSERT(body);
 438
 439         *fid = d->opd_pre_last_created_fid;
 440         rc = osp_precreate_fids(env, d, fid, &grow);
 441         if (rc == 1) {
 442                 /* Current seq has been used up*/
 443                 if (!osp_is_fid_client(d)) {
 444                         osp_pre_update_status(d, -ENOSPC);
 445                         rc = -ENOSPC;
 446                 }
 447                 wake_up(&d->opd_pre_waitq);
 448                 GOTO(out_req, rc);
 449         }
 450
 451         if (!osp_is_fid_client(d)) {
 452                 /* Non-FID client will always send seq 0 because of
 453                  * compatiblity */
 454                 LASSERTF(fid_is_idif(fid), "Invalid fid "DFID"\n", PFID(fid));
 455                 fid->f_seq = 0;
 456         }
 457
 458         fid_to_ostid(fid, &body->oa.o_oi);
 459         body->oa.o_valid = OBD_MD_FLGROUP;
 460
 461         ptlrpc_request_set_replen(req);
 462
 463         rc = ptlrpc_queue_wait(req);
 464         if (rc) {
 465                 CERROR("%s: can't precreate: rc = %d\n", d->opd_obd->obd_name,
 466                        rc);
 467                 GOTO(out_req, rc);
 468         }
 469         LASSERT(req->rq_transno == 0);
 470
 471         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 472         if (body == NULL)
 473                 GOTO(out_req, rc = -EPROTO);
 474
 475         ostid_to_fid(fid, &body->oa.o_oi, d->opd_index);
 476         if (osp_fid_diff(fid, &d->opd_pre_used_fid) <= 0) {
 477                 CERROR("%s: precreate fid "DFID" < local used fid "DFID
 478                        ": rc = %d\n", d->opd_obd->obd_name,
 479                        PFID(fid), PFID(&d->opd_pre_used_fid), -ESTALE);
 480                 GOTO(out_req, rc = -ESTALE);
 481         }
 482
 483         diff = osp_fid_diff(fid, &d->opd_pre_last_created_fid);
 484
 485         spin_lock(&d->opd_pre_lock);
 486         if (diff < grow) {
 487                 /* the OST has not managed to create all the
 488                  * objects we asked for */
 489                 d->opd_pre_grow_count = max(diff, OST_MIN_PRECREATE);
 490                 d->opd_pre_grow_slow = 1;
 491         } else {
 492                 /* the OST is able to keep up with the work,
 493                  * we could consider increasing grow_count
 494                  * next time if needed */
 495                 d->opd_pre_grow_slow = 0;
 496         }
 497
 498         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 499         fid_to_ostid(fid, &body->oa.o_oi);
 500
 501         d->opd_pre_last_created_fid = *fid;
 502         spin_unlock(&d->opd_pre_lock);
 503
 504         CDEBUG(D_HA, "%s: current precreated pool: "DFID"-"DFID"\n",
 505                d->opd_obd->obd_name, PFID(&d->opd_pre_used_fid),
 506                PFID(&d->opd_pre_last_created_fid));
 507 out_req:
 508         /* now we can wakeup all users awaiting for objects */
 509         osp_pre_update_status(d, rc);
 510         wake_up(&d->opd_pre_user_waitq);
 511
 512         ptlrpc_req_finished(req);
 513         RETURN(rc);
 514 }
 515
 516 static int osp_get_lastfid_from_ost(const struct lu_env *env,
 517                                     struct osp_device *d)
 518 {
 519         struct ptlrpc_request   *req = NULL;
 520         struct obd_import       *imp;
 521         struct lu_fid           *last_fid;
 522         char                    *tmp;
 523         int                     rc;
 524         ENTRY;
 525
 526         imp = d->opd_obd->u.cli.cl_import;
 527         LASSERT(imp);
 528
 529         req = ptlrpc_request_alloc(imp, &RQF_OST_GET_INFO_LAST_FID);
 530         if (req == NULL)
 531                 RETURN(-ENOMEM);
 532
 533         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY, RCL_CLIENT,
 534                              sizeof(KEY_LAST_FID));
 535
 536         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
 537         if (rc) {
 538                 ptlrpc_request_free(req);
 539                 RETURN(rc);
 540         }
 541
 542         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
 543         memcpy(tmp, KEY_LAST_FID, sizeof(KEY_LAST_FID));
 544
 545         req->rq_no_delay = req->rq_no_resend = 1;
 546         last_fid = req_capsule_client_get(&req->rq_pill, &RMF_FID);
 547         fid_cpu_to_le(last_fid, &d->opd_last_used_fid);
 548
 549         ptlrpc_request_set_replen(req);
 550
 551         rc = ptlrpc_queue_wait(req);
 552         if (rc) {
 553                 /* bad-bad OST.. let sysadm sort this out */
 554                 if (rc == -ENOTSUPP) {
 555                         CERROR("%s: server does not support FID: rc = %d\n",
 556                                d->opd_obd->obd_name, -ENOTSUPP);
 557                 }
 558                 ptlrpc_set_import_active(imp, 0);
 559                 GOTO(out, rc);
 560         }
 561
 562         last_fid = req_capsule_server_get(&req->rq_pill, &RMF_FID);
 563         if (last_fid == NULL) {
 564                 CERROR("%s: Got last_fid failed.\n", d->opd_obd->obd_name);
 565                 GOTO(out, rc = -EPROTO);
 566         }
 567
 568         if (!fid_is_sane(last_fid)) {
 569                 CERROR("%s: Got insane last_fid "DFID"\n",
 570                        d->opd_obd->obd_name, PFID(last_fid));
 571                 GOTO(out, rc = -EPROTO);
 572         }
 573
 574         /* Only update the last used fid, if the OST has objects for
 575          * this sequence, i.e. fid_oid > 0 */
 576         if (fid_oid(last_fid) > 0)
 577                 d->opd_last_used_fid = *last_fid;
 578
 579         CDEBUG(D_HA, "%s: Got last_fid "DFID"\n", d->opd_obd->obd_name,
 580                PFID(last_fid));
 581
 582 out:
 583         ptlrpc_req_finished(req);
 584         RETURN(rc);
 585 }
 586
 587 /**
 588  * asks OST to clean precreate orphans
 589  * and gets next id for new objects
 590  */
 591 static int osp_precreate_cleanup_orphans(struct lu_env *env,
 592                                          struct osp_device *d)
 593 {
 594         struct osp_thread_info  *osi = osp_env_info(env);
 595         struct lu_fid           *last_fid = &osi->osi_fid;
 596         struct ptlrpc_request   *req = NULL;
 597         struct obd_import       *imp;
 598         struct ost_body         *body;
 599         struct l_wait_info       lwi = { 0 };
 600         int                      update_status = 0;
 601         int                      rc;
 602         int                      diff;
 603
 604         ENTRY;
 605
 606         /*
 607          * wait for local recovery to finish, so we can cleanup orphans
 608          * orphans are all objects since "last used" (assigned), but
 609          * there might be objects reserved and in some cases they won't
 610          * be used. we can't cleanup them till we're sure they won't be
 611          * used. also can't we allow new reservations because they may
 612          * end up getting orphans being cleaned up below. so we block
 613          * new reservations and wait till all reserved objects either
 614          * user or released.
 615          */
 616         spin_lock(&d->opd_pre_lock);
 617         d->opd_pre_recovering = 1;
 618         spin_unlock(&d->opd_pre_lock);
 619         /*
 620          * The locking above makes sure the opd_pre_reserved check below will
 621          * catch all osp_precreate_reserve() calls who find
 622          * "!opd_pre_recovering".
 623          */
 624         l_wait_event(d->opd_pre_waitq,
 625                      (!d->opd_pre_reserved && d->opd_recovery_completed) ||
 626                      !osp_precreate_running(d) || d->opd_got_disconnected,
 627                      &lwi);
 628         if (!osp_precreate_running(d) || d->opd_got_disconnected)
 629                 GOTO(out, rc = -EAGAIN);
 630
 631         CDEBUG(D_HA, "%s: going to cleanup orphans since "DFID"\n",
 632                d->opd_obd->obd_name, PFID(&d->opd_last_used_fid));
 633
 634         *last_fid = d->opd_last_used_fid;
 635         /* The OSP should already get the valid seq now */
 636         LASSERT(!fid_is_zero(last_fid));
 637         if (fid_oid(&d->opd_last_used_fid) < 2) {
 638                 /* lastfid looks strange... ask OST */
 639                 rc = osp_get_lastfid_from_ost(env, d);
 640                 if (rc)
 641                         GOTO(out, rc);
 642         }
 643
 644         imp = d->opd_obd->u.cli.cl_import;
 645         LASSERT(imp);
 646
 647         req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
 648         if (req == NULL)
 649                 GOTO(out, rc = -ENOMEM);
 650
 651         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 652         if (rc) {
 653                 ptlrpc_request_free(req);
 654                 req = NULL;
 655                 GOTO(out, rc);
 656         }
 657
 658         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 659         if (body == NULL)
 660                 GOTO(out, rc = -EPROTO);
 661
 662         body->oa.o_flags = OBD_FL_DELORPHAN;
 663         body->oa.o_valid = OBD_MD_FLFLAGS | OBD_MD_FLGROUP;
 664
 665         fid_to_ostid(&d->opd_last_used_fid, &body->oa.o_oi);
 666
 667         ptlrpc_request_set_replen(req);
 668
 669         /* Don't resend the delorphan req */
 670         req->rq_no_resend = req->rq_no_delay = 1;
 671
 672         rc = ptlrpc_queue_wait(req);
 673         if (rc) {
 674                 update_status = 1;
 675                 GOTO(out, rc);
 676         }
 677
 678         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 679         if (body == NULL)
 680                 GOTO(out, rc = -EPROTO);
 681
 682         /*
 683          * OST provides us with id new pool starts from in body->oa.o_id
 684          */
 685         ostid_to_fid(last_fid, &body->oa.o_oi, d->opd_index);
 686
 687         spin_lock(&d->opd_pre_lock);
 688         diff = osp_fid_diff(&d->opd_last_used_fid, last_fid);
 689         if (diff > 0) {
 690                 d->opd_pre_grow_count = OST_MIN_PRECREATE + diff;
 691                 d->opd_pre_last_created_fid = d->opd_last_used_fid;
 692         } else {
 693                 d->opd_pre_grow_count = OST_MIN_PRECREATE;
 694                 d->opd_pre_last_created_fid = *last_fid;
 695         }
 696         /*
 697          * This empties the pre-creation pool and effectively blocks any new
 698          * reservations.
 699          */
 700         LASSERT(fid_oid(&d->opd_pre_last_created_fid) <=
 701                 LUSTRE_DATA_SEQ_MAX_WIDTH);
 702         d->opd_pre_used_fid = d->opd_pre_last_created_fid;
 703         d->opd_pre_grow_slow = 0;
 704         spin_unlock(&d->opd_pre_lock);
 705
 706         CDEBUG(D_HA, "%s: Got last_id "DFID" from OST, last_created "DFID
 707                "last_used is "DFID"\n", d->opd_obd->obd_name, PFID(last_fid),
 708                PFID(&d->opd_pre_last_created_fid), PFID(&d->opd_last_used_fid));
 709 out:
 710         if (req)
 711                 ptlrpc_req_finished(req);
 712
 713         spin_lock(&d->opd_pre_lock);
 714         d->opd_pre_recovering = 0;
 715         spin_unlock(&d->opd_pre_lock);
 716
 717         /*
 718          * If rc is zero, the pre-creation window should have been emptied.
 719          * Since waking up the herd would be useless without pre-created
 720          * objects, we defer the signal to osp_precreate_send() in that case.
 721          */
 722         if (rc != 0) {
 723                 if (update_status) {
 724                         CERROR("%s: cannot cleanup orphans: rc = %d\n",
 725                                d->opd_obd->obd_name, rc);
 726                         /* we can't proceed from here, OST seem to
 727                          * be in a bad shape, better to wait for
 728                          * a new instance of the server and repeat
 729                          * from the beginning. notify possible waiters
 730                          * this OSP isn't quite functional yet */
 731                         osp_pre_update_status(d, rc);
 732                 } else {
 733                         wake_up(&d->opd_pre_user_waitq);
 734                 }
 735         }
 736
 737         RETURN(rc);
 738 }
 739
 740 /*
 741  * the function updates current precreation status used: functional or not
 742  *
 743  * rc is a last code from the transport, rc == 0 meaning transport works
 744  * well and users of lod can use objects from this OSP
 745  *
 746  * the status depends on current usage of OST
 747  */
 748 void osp_pre_update_status(struct osp_device *d, int rc)
 749 {
 750         struct obd_statfs       *msfs = &d->opd_statfs;
 751         int                      old = d->opd_pre_status;
 752         __u64                    used;
 753
 754         d->opd_pre_status = rc;
 755         if (rc)
 756                 goto out;
 757
 758         /* Add a bit of hysteresis so this flag isn't continually flapping,
 759          * and ensure that new files don't get extremely fragmented due to
 760          * only a small amount of available space in the filesystem.
 761          * We want to set the NOSPC flag when there is less than ~0.1% free
 762          * and clear it when there is at least ~0.2% free space, so:
 763          *                   avail < ~0.1% max          max = avail + used
 764          *            1025 * avail < avail + used       used = blocks - free
 765          *            1024 * avail < used
 766          *            1024 * avail < blocks - free
 767          *                   avail < ((blocks - free) >> 10)
 768          *
 769          * On very large disk, say 16TB 0.1% will be 16 GB. We don't want to
 770          * lose that amount of space so in those cases we report no space left
 771          * if their is less than 1 GB left.                             */
 772         if (likely(msfs->os_type)) {
 773                 used = min_t(__u64, (msfs->os_blocks - msfs->os_bfree) >> 10,
 774                                     1 << 30);
 775                 if ((msfs->os_ffree < 32) || (msfs->os_bavail < used)) {
 776                         d->opd_pre_status = -ENOSPC;
 777                         if (old != -ENOSPC)
 778                                 CDEBUG(D_INFO, "%s: status: "LPU64" blocks, "
 779                                        LPU64" free, "LPU64" used, "LPU64" "
 780                                        "avail -> %d: rc = %d\n",
 781                                        d->opd_obd->obd_name, msfs->os_blocks,
 782                                        msfs->os_bfree, used, msfs->os_bavail,
 783                                        d->opd_pre_status, rc);
 784                         CDEBUG(D_INFO,
 785                                "non-commited changes: %lu, in progress: %u\n",
 786                                d->opd_syn_changes, d->opd_syn_rpc_in_progress);
 787                 } else if (old == -ENOSPC) {
 788                         d->opd_pre_status = 0;
 789                         spin_lock(&d->opd_pre_lock);
 790                         d->opd_pre_grow_slow = 0;
 791                         d->opd_pre_grow_count = OST_MIN_PRECREATE;
 792                         spin_unlock(&d->opd_pre_lock);
 793                         wake_up(&d->opd_pre_waitq);
 794                         CDEBUG(D_INFO, "%s: no space: "LPU64" blocks, "LPU64
 795                                " free, "LPU64" used, "LPU64" avail -> %d: "
 796                                "rc = %d\n", d->opd_obd->obd_name,
 797                                msfs->os_blocks, msfs->os_bfree, used,
 798                                msfs->os_bavail, d->opd_pre_status, rc);
 799                 }
 800         }
 801
 802 out:
 803         wake_up(&d->opd_pre_user_waitq);
 804 }
 805
 806 int osp_init_pre_fid(struct osp_device *osp)
 807 {
 808         struct lu_env           env;
 809         struct osp_thread_info  *osi;
 810         struct lu_client_seq    *cli_seq;
 811         struct lu_fid           *last_fid;
 812         int                     rc;
 813         ENTRY;
 814
 815         LASSERT(osp->opd_pre != NULL);
 816
 817         /* Return if last_used fid has been initialized */
 818         if (!fid_is_zero(&osp->opd_last_used_fid))
 819                 RETURN(0);
 820
 821         rc = lu_env_init(&env, osp->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
 822         if (rc) {
 823                 CERROR("%s: init env error: rc = %d\n",
 824                        osp->opd_obd->obd_name, rc);
 825                 RETURN(rc);
 826         }
 827
 828         osi = osp_env_info(&env);
 829         last_fid = &osi->osi_fid;
 830         fid_zero(last_fid);
 831         /* For a freshed fs, it will allocate a new sequence first */
 832         if (osp_is_fid_client(osp) && osp->opd_group != 0) {
 833                 cli_seq = osp->opd_obd->u.cli.cl_seq;
 834                 rc = seq_client_get_seq(&env, cli_seq, &last_fid->f_seq);
 835                 if (rc != 0) {
 836                         CERROR("%s: alloc fid error: rc = %d\n",
 837                                osp->opd_obd->obd_name, rc);
 838                         GOTO(out, rc);
 839                 }
 840         } else {
 841                 last_fid->f_seq = fid_idif_seq(0, osp->opd_index);
 842         }
 843         last_fid->f_oid = 1;
 844         last_fid->f_ver = 0;
 845
 846         spin_lock(&osp->opd_pre_lock);
 847         osp->opd_last_used_fid = *last_fid;
 848         osp->opd_pre_used_fid = *last_fid;
 849         osp->opd_pre_last_created_fid = *last_fid;
 850         spin_unlock(&osp->opd_pre_lock);
 851         rc = osp_write_last_oid_seq_files(&env, osp, last_fid, 1);
 852         if (rc != 0) {
 853                 CERROR("%s: write fid error: rc = %d\n",
 854                        osp->opd_obd->obd_name, rc);
 855                 GOTO(out, rc);
 856         }
 857 out:
 858         lu_env_fini(&env);
 859         RETURN(rc);
 860 }
 861
 862 static int osp_precreate_thread(void *_arg)
 863 {
 864         struct osp_device       *d = _arg;
 865         struct ptlrpc_thread    *thread = &d->opd_pre_thread;
 866         struct l_wait_info       lwi = { 0 };
 867         struct lu_env            env;
 868         int                      rc;
 869
 870         ENTRY;
 871
 872         rc = lu_env_init(&env, d->opd_dt_dev.dd_lu_dev.ld_type->ldt_ctx_tags);
 873         if (rc) {
 874                 CERROR("%s: init env error: rc = %d\n", d->opd_obd->obd_name,
 875                        rc);
 876                 RETURN(rc);
 877         }
 878
 879         spin_lock(&d->opd_pre_lock);
 880         thread->t_flags = SVC_RUNNING;
 881         spin_unlock(&d->opd_pre_lock);
 882         wake_up(&thread->t_ctl_waitq);
 883
 884         while (osp_precreate_running(d)) {
 885                 /*
 886                  * need to be connected to OST
 887                  */
 888                 while (osp_precreate_running(d)) {
 889                         l_wait_event(d->opd_pre_waitq,
 890                                      !osp_precreate_running(d) ||
 891                                      d->opd_new_connection,
 892                                      &lwi);
 893
 894                         if (!d->opd_new_connection)
 895                                 continue;
 896
 897                         d->opd_new_connection = 0;
 898                         d->opd_got_disconnected = 0;
 899                         break;
 900                 }
 901
 902                 if (!osp_precreate_running(d))
 903                         break;
 904
 905                 LASSERT(d->opd_obd->u.cli.cl_seq != NULL);
 906                 /* Sigh, fid client is not ready yet */
 907                 if (d->opd_obd->u.cli.cl_seq->lcs_exp == NULL)
 908                         continue;
 909
 910                 /* Init fid for osp_precreate if necessary */
 911                 rc = osp_init_pre_fid(d);
 912                 if (rc != 0) {
 913                         class_export_put(d->opd_exp);
 914                         d->opd_obd->u.cli.cl_seq->lcs_exp = NULL;
 915                         CERROR("%s: init pre fid error: rc = %d\n",
 916                                d->opd_obd->obd_name, rc);
 917                         continue;
 918                 }
 919
 920                 osp_statfs_update(d);
 921
 922                 /*
 923                  * Clean up orphans or recreate missing objects.
 924                  */
 925                 rc = osp_precreate_cleanup_orphans(&env, d);
 926                 if (rc != 0)
 927                         continue;
 928                 /*
 929                  * connected, can handle precreates now
 930                  */
 931                 while (osp_precreate_running(d)) {
 932                         l_wait_event(d->opd_pre_waitq,
 933                                      !osp_precreate_running(d) ||
 934                                      osp_precreate_near_empty(&env, d) ||
 935                                      osp_statfs_need_update(d) ||
 936                                      d->opd_got_disconnected, &lwi);
 937
 938                         if (!osp_precreate_running(d))
 939                                 break;
 940
 941                         /* something happened to the connection
 942                          * have to start from the beginning */
 943                         if (d->opd_got_disconnected)
 944                                 break;
 945
 946                         if (osp_statfs_need_update(d))
 947                                 osp_statfs_update(d);
 948
 949                         /* To avoid handling different seq in precreate/orphan
 950                          * cleanup, it will hold precreate until current seq is
 951                          * used up. */
 952                         if (unlikely(osp_precreate_end_seq(&env, d) &&
 953                             !osp_create_end_seq(&env, d)))
 954                                 continue;
 955
 956                         if (unlikely(osp_precreate_end_seq(&env, d) &&
 957                                      osp_create_end_seq(&env, d))) {
 958                                 LCONSOLE_INFO("%s:"LPX64" is used up."
 959                                               " Update to new seq\n",
 960                                               d->opd_obd->obd_name,
 961                                          fid_seq(&d->opd_pre_last_created_fid));
 962                                 rc = osp_precreate_rollover_new_seq(&env, d);
 963                                 if (rc)
 964                                         continue;
 965                         }
 966
 967                         if (osp_precreate_near_empty(&env, d)) {
 968                                 rc = osp_precreate_send(&env, d);
 969                                 /* osp_precreate_send() sets opd_pre_status
 970                                  * in case of error, that prevent the using of
 971                                  * failed device. */
 972                                 if (rc < 0 && rc != -ENOSPC &&
 973                                     rc != -ETIMEDOUT && rc != -ENOTCONN)
 974                                         CERROR("%s: cannot precreate objects:"
 975                                                " rc = %d\n",
 976                                                d->opd_obd->obd_name, rc);
 977                         }
 978                 }
 979         }
 980
 981         thread->t_flags = SVC_STOPPED;
 982         lu_env_fini(&env);
 983         wake_up(&thread->t_ctl_waitq);
 984
 985         RETURN(0);
 986 }
 987
 988 static int osp_precreate_ready_condition(const struct lu_env *env,
 989                                          struct osp_device *d)
 990 {
 991         if (d->opd_pre_recovering)
 992                 return 0;
 993
 994         /* ready if got enough precreated objects */
 995         /* we need to wait for others (opd_pre_reserved) and our object (+1) */
 996         if (d->opd_pre_reserved + 1 < osp_objs_precreated(env, d))
 997                 return 1;
 998
 999         /* ready if OST reported no space and no destroys in progress */
1000         if (d->opd_syn_changes + d->opd_syn_rpc_in_progress == 0 &&
1001             d->opd_pre_status == -ENOSPC)
1002                 return 1;
1003
1004         /* Bail out I/O fails to OST */
1005         if (d->opd_pre_status != 0 &&
1006             d->opd_pre_status != -EAGAIN &&
1007             d->opd_pre_status != -ENODEV &&
1008             d->opd_pre_status != -ENOSPC) {
1009                 /* DEBUG LU-3230 */
1010                 if (d->opd_pre_status != -EIO)
1011                         CERROR("%s: precreate failed opd_pre_status %d\n",
1012                                d->opd_obd->obd_name, d->opd_pre_status);
1013                 return 1;
1014         }
1015
1016         return 0;
1017 }
1018
1019 static int osp_precreate_timeout_condition(void *data)
1020 {
1021         struct osp_device *d = data;
1022
1023         CDEBUG(D_HA, "%s: slow creates, last="DFID", next="DFID", "
1024               "reserved="LPU64", syn_changes=%lu, "
1025               "syn_rpc_in_progress=%d, status=%d\n",
1026               d->opd_obd->obd_name, PFID(&d->opd_pre_last_created_fid),
1027               PFID(&d->opd_pre_used_fid), d->opd_pre_reserved,
1028               d->opd_syn_changes, d->opd_syn_rpc_in_progress,
1029               d->opd_pre_status);
1030
1031         return 1;
1032 }
1033
1034 /*
1035  * called to reserve object in the pool
1036  * return codes:
1037  *  ENOSPC - no space on corresponded OST
1038  *  EAGAIN - precreation is in progress, try later
1039  *  EIO    - no access to OST
1040  */
1041 int osp_precreate_reserve(const struct lu_env *env, struct osp_device *d)
1042 {
1043         struct l_wait_info       lwi;
1044         cfs_time_t               expire = cfs_time_shift(obd_timeout);
1045         int                      precreated, rc;
1046
1047         ENTRY;
1048
1049         LASSERTF(osp_objs_precreated(env, d) >= 0, "Last created FID "DFID
1050                  "Next FID "DFID"\n", PFID(&d->opd_pre_last_created_fid),
1051                  PFID(&d->opd_pre_used_fid));
1052
1053         /*
1054          * wait till:
1055          *  - preallocation is done
1056          *  - no free space expected soon
1057          *  - can't connect to OST for too long (obd_timeout)
1058          *  - OST can allocate fid sequence.
1059          */
1060         while ((rc = d->opd_pre_status) == 0 || rc == -ENOSPC ||
1061                 rc == -ENODEV || rc == -EAGAIN || rc == -ENOTCONN) {
1062
1063                 /*
1064                  * increase number of precreations
1065                  */
1066                 precreated = osp_objs_precreated(env, d);
1067                 if (d->opd_pre_grow_count < d->opd_pre_max_grow_count &&
1068                     d->opd_pre_grow_slow == 0 &&
1069                     precreated <= (d->opd_pre_grow_count / 4 + 1)) {
1070                         spin_lock(&d->opd_pre_lock);
1071                         d->opd_pre_grow_slow = 1;
1072                         d->opd_pre_grow_count *= 2;
1073                         spin_unlock(&d->opd_pre_lock);
1074                 }
1075
1076                 spin_lock(&d->opd_pre_lock);
1077                 precreated = osp_objs_precreated(env, d);
1078                 if (precreated > d->opd_pre_reserved &&
1079                     !d->opd_pre_recovering) {
1080                         d->opd_pre_reserved++;
1081                         spin_unlock(&d->opd_pre_lock);
1082                         rc = 0;
1083
1084                         /* XXX: don't wake up if precreation is in progress */
1085                         if (osp_precreate_near_empty_nolock(env, d) &&
1086                            !osp_precreate_end_seq_nolock(env, d))
1087                                 wake_up(&d->opd_pre_waitq);
1088
1089                         break;
1090                 }
1091                 spin_unlock(&d->opd_pre_lock);
1092
1093                 /*
1094                  * all precreated objects have been used and no-space
1095                  * status leave us no chance to succeed very soon
1096                  * but if there is destroy in progress, then we should
1097                  * wait till that is done - some space might be released
1098                  */
1099                 if (unlikely(rc == -ENOSPC)) {
1100                         if (d->opd_syn_changes) {
1101                                 /* force local commit to release space */
1102                                 dt_commit_async(env, d->opd_storage);
1103                         }
1104                         if (d->opd_syn_rpc_in_progress) {
1105                                 /* just wait till destroys are done */
1106                                 /* see l_wait_even() few lines below */
1107                         }
1108                         if (d->opd_syn_changes +
1109                             d->opd_syn_rpc_in_progress == 0) {
1110                                 /* no hope for free space */
1111                                 break;
1112                         }
1113                 }
1114
1115                 /* XXX: don't wake up if precreation is in progress */
1116                 wake_up(&d->opd_pre_waitq);
1117
1118                 lwi = LWI_TIMEOUT(expire - cfs_time_current(),
1119                                 osp_precreate_timeout_condition, d);
1120                 if (cfs_time_aftereq(cfs_time_current(), expire)) {
1121                         rc = -ETIMEDOUT;
1122                         break;
1123                 }
1124
1125                 l_wait_event(d->opd_pre_user_waitq,
1126                              osp_precreate_ready_condition(env, d), &lwi);
1127         }
1128
1129         RETURN(rc);
1130 }
1131
1132 /*
1133  * this function relies on reservation made before
1134  */
1135 int osp_precreate_get_fid(const struct lu_env *env, struct osp_device *d,
1136                           struct lu_fid *fid)
1137 {
1138         /* grab next id from the pool */
1139         spin_lock(&d->opd_pre_lock);
1140
1141         LASSERTF(osp_fid_diff(&d->opd_pre_used_fid,
1142                              &d->opd_pre_last_created_fid) < 0,
1143                  "next fid "DFID" last created fid "DFID"\n",
1144                  PFID(&d->opd_pre_used_fid),
1145                  PFID(&d->opd_pre_last_created_fid));
1146
1147         d->opd_pre_used_fid.f_oid++;
1148         memcpy(fid, &d->opd_pre_used_fid, sizeof(*fid));
1149         d->opd_pre_reserved--;
1150         /*
1151          * last_used_id must be changed along with getting new id otherwise
1152          * we might miscalculate gap causing object loss or leak
1153          */
1154         osp_update_last_fid(d, fid);
1155         spin_unlock(&d->opd_pre_lock);
1156
1157         /*
1158          * probably main thread suspended orphan cleanup till
1159          * all reservations are released, see comment in
1160          * osp_precreate_thread() just before orphan cleanup
1161          */
1162         if (unlikely(d->opd_pre_reserved == 0 && d->opd_pre_status))
1163                 wake_up(&d->opd_pre_waitq);
1164
1165         return 0;
1166 }
1167
1168 /*
1169  *
1170  */
1171 int osp_object_truncate(const struct lu_env *env, struct dt_object *dt,
1172                         __u64 size)
1173 {
1174         struct osp_device       *d = lu2osp_dev(dt->do_lu.lo_dev);
1175         struct ptlrpc_request   *req = NULL;
1176         struct obd_import       *imp;
1177         struct ost_body         *body;
1178         struct obdo             *oa = NULL;
1179         int                      rc;
1180
1181         ENTRY;
1182
1183         imp = d->opd_obd->u.cli.cl_import;
1184         LASSERT(imp);
1185
1186         req = ptlrpc_request_alloc(imp, &RQF_OST_PUNCH);
1187         if (req == NULL)
1188                 RETURN(-ENOMEM);
1189
1190         /* XXX: capa support? */
1191         /* osc_set_capa_size(req, &RMF_CAPA1, capa); */
1192         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
1193         if (rc) {
1194                 ptlrpc_request_free(req);
1195                 RETURN(rc);
1196         }
1197
1198         /*
1199          * XXX: decide how do we do here with resend
1200          * if we don't resend, then client may see wrong file size
1201          * if we do resend, then MDS thread can get stuck for quite long
1202          */
1203         req->rq_no_resend = req->rq_no_delay = 1;
1204
1205         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1206         ptlrpc_at_set_req_timeout(req);
1207
1208         OBD_ALLOC_PTR(oa);
1209         if (oa == NULL)
1210                 GOTO(out, rc = -ENOMEM);
1211
1212         rc = fid_to_ostid(lu_object_fid(&dt->do_lu), &oa->o_oi);
1213         LASSERT(rc == 0);
1214         oa->o_size = size;
1215         oa->o_blocks = OBD_OBJECT_EOF;
1216         oa->o_valid = OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
1217                       OBD_MD_FLID | OBD_MD_FLGROUP;
1218
1219         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
1220         LASSERT(body);
1221         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
1222
1223         /* XXX: capa support? */
1224         /* osc_pack_capa(req, body, capa); */
1225
1226         ptlrpc_request_set_replen(req);
1227
1228         rc = ptlrpc_queue_wait(req);
1229         if (rc)
1230                 CERROR("can't punch object: %d\n", rc);
1231 out:
1232         ptlrpc_req_finished(req);
1233         if (oa)
1234                 OBD_FREE_PTR(oa);
1235         RETURN(rc);
1236 }
1237
1238 int osp_init_precreate(struct osp_device *d)
1239 {
1240         struct l_wait_info       lwi = { 0 };
1241         struct task_struct              *task;
1242
1243         ENTRY;
1244
1245         OBD_ALLOC_PTR(d->opd_pre);
1246         if (d->opd_pre == NULL)
1247                 RETURN(-ENOMEM);
1248
1249         /* initially precreation isn't ready */
1250         d->opd_pre_status = -EAGAIN;
1251         fid_zero(&d->opd_pre_used_fid);
1252         d->opd_pre_used_fid.f_oid = 1;
1253         fid_zero(&d->opd_pre_last_created_fid);
1254         d->opd_pre_last_created_fid.f_oid = 1;
1255         d->opd_pre_reserved = 0;
1256         d->opd_got_disconnected = 1;
1257         d->opd_pre_grow_slow = 0;
1258         d->opd_pre_grow_count = OST_MIN_PRECREATE;
1259         d->opd_pre_min_grow_count = OST_MIN_PRECREATE;
1260         d->opd_pre_max_grow_count = OST_MAX_PRECREATE;
1261
1262         spin_lock_init(&d->opd_pre_lock);
1263         init_waitqueue_head(&d->opd_pre_waitq);
1264         init_waitqueue_head(&d->opd_pre_user_waitq);
1265         init_waitqueue_head(&d->opd_pre_thread.t_ctl_waitq);
1266
1267         /*
1268          * Initialize statfs-related things
1269          */
1270         d->opd_statfs_maxage = 5; /* default update interval */
1271         d->opd_statfs_fresh_till = cfs_time_shift(-1000);
1272         CDEBUG(D_OTHER, "current %llu, fresh till %llu\n",
1273                (unsigned long long)cfs_time_current(),
1274                (unsigned long long)d->opd_statfs_fresh_till);
1275         cfs_timer_init(&d->opd_statfs_timer, osp_statfs_timer_cb, d);
1276
1277         /*
1278          * start thread handling precreation and statfs updates
1279          */
1280         task = kthread_run(osp_precreate_thread, d,
1281                            "osp-pre-%u-%u", d->opd_index, d->opd_group);
1282         if (IS_ERR(task)) {
1283                 CERROR("can't start precreate thread %ld\n", PTR_ERR(task));
1284                 RETURN(PTR_ERR(task));
1285         }
1286
1287         l_wait_event(d->opd_pre_thread.t_ctl_waitq,
1288                      osp_precreate_running(d) || osp_precreate_stopped(d),
1289                      &lwi);
1290
1291         RETURN(0);
1292 }
1293
1294 void osp_precreate_fini(struct osp_device *d)
1295 {
1296         struct ptlrpc_thread *thread;
1297
1298         ENTRY;
1299
1300         cfs_timer_disarm(&d->opd_statfs_timer);
1301
1302         if (d->opd_pre == NULL)
1303                 RETURN_EXIT;
1304
1305         thread = &d->opd_pre_thread;
1306
1307         thread->t_flags = SVC_STOPPING;
1308         wake_up(&d->opd_pre_waitq);
1309
1310         wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
1311
1312         OBD_FREE_PTR(d->opd_pre);
1313         d->opd_pre = NULL;
1314
1315         EXIT;
1316 }
1317