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