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) 2011, 2012, Intel, Inc.
  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  */
  43
  44 #ifndef EXPORT_SYMTAB
  45 # define EXPORT_SYMTAB
  46 #endif
  47 #define DEBUG_SUBSYSTEM S_MDS
  48
  49 #include "osp_internal.h"
  50
  51 /*
  52  * there are two specific states to take care about:
  53  *
  54  * = import is disconnected =
  55  *
  56  * = import is inactive =
  57  *   in this case osp_declare_object_create() returns an error
  58  *
  59  */
  60
  61 /*
  62  * statfs
  63  */
  64 static inline int osp_statfs_need_update(struct osp_device *d)
  65 {
  66         return !cfs_time_before(cfs_time_current(),
  67                                 d->opd_statfs_fresh_till);
  68 }
  69
  70 static void osp_statfs_timer_cb(unsigned long _d)
  71 {
  72         struct osp_device *d = (struct osp_device *) _d;
  73
  74         LASSERT(d);
  75         cfs_waitq_signal(&d->opd_pre_waitq);
  76 }
  77
  78 static int osp_statfs_interpret(const struct lu_env *env,
  79                                 struct ptlrpc_request *req,
  80                                 union ptlrpc_async_args *aa, int rc)
  81 {
  82         struct obd_import       *imp = req->rq_import;
  83         struct obd_statfs       *msfs;
  84         struct osp_device       *d;
  85
  86         ENTRY;
  87
  88         aa = ptlrpc_req_async_args(req);
  89         d = aa->pointer_arg[0];
  90         LASSERT(d);
  91
  92         if (rc != 0)
  93                 GOTO(out, rc);
  94
  95         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
  96         if (msfs == NULL)
  97                 GOTO(out, rc = -EPROTO);
  98
  99         d->opd_statfs = *msfs;
 100
 101         osp_pre_update_status(d, rc);
 102
 103         /* schedule next update */
 104         d->opd_statfs_fresh_till = cfs_time_shift(d->opd_statfs_maxage);
 105         cfs_timer_arm(&d->opd_statfs_timer, d->opd_statfs_fresh_till);
 106         d->opd_statfs_update_in_progress = 0;
 107
 108         CDEBUG(D_CACHE, "updated statfs %p\n", d);
 109
 110         RETURN(0);
 111 out:
 112         /* couldn't update statfs, try again as soon as possible */
 113         cfs_waitq_signal(&d->opd_pre_waitq);
 114         if (req->rq_import_generation == imp->imp_generation)
 115                 CERROR("%s: couldn't update statfs: rc = %d\n",
 116                        d->opd_obd->obd_name, rc);
 117         RETURN(rc);
 118 }
 119
 120 static int osp_statfs_update(struct osp_device *d)
 121 {
 122         struct ptlrpc_request   *req;
 123         struct obd_import       *imp;
 124         union ptlrpc_async_args *aa;
 125         int                      rc;
 126
 127         ENTRY;
 128
 129         CDEBUG(D_CACHE, "going to update statfs\n");
 130
 131         imp = d->opd_obd->u.cli.cl_import;
 132         LASSERT(imp);
 133
 134         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
 135         if (req == NULL)
 136                 RETURN(-ENOMEM);
 137
 138         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
 139         if (rc) {
 140                 ptlrpc_request_free(req);
 141                 RETURN(rc);
 142         }
 143         ptlrpc_request_set_replen(req);
 144         req->rq_request_portal = OST_CREATE_PORTAL;
 145         ptlrpc_at_set_req_timeout(req);
 146
 147         req->rq_interpret_reply = (ptlrpc_interpterer_t)osp_statfs_interpret;
 148         aa = ptlrpc_req_async_args(req);
 149         aa->pointer_arg[0] = d;
 150
 151         /*
 152          * no updates till reply
 153          */
 154         cfs_timer_disarm(&d->opd_statfs_timer);
 155         d->opd_statfs_fresh_till = cfs_time_shift(obd_timeout * 1000);
 156         d->opd_statfs_update_in_progress = 1;
 157
 158         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
 159
 160         RETURN(0);
 161 }
 162
 163 /*
 164  * XXX: there might be a case where removed object(s) do not add free
 165  * space (empty object). if the number of such deletions is high, then
 166  * we can start to update statfs too often - a rpc storm
 167  * TODO: some throttling is needed
 168  */
 169 void osp_statfs_need_now(struct osp_device *d)
 170 {
 171         if (!d->opd_statfs_update_in_progress) {
 172                 /*
 173                  * if current status is -ENOSPC (lack of free space on OST)
 174                  * then we should poll OST immediately once object destroy
 175                  * is replied
 176                  */
 177                 d->opd_statfs_fresh_till = cfs_time_shift(-1);
 178                 cfs_timer_disarm(&d->opd_statfs_timer);
 179                 cfs_waitq_signal(&d->opd_pre_waitq);
 180         }
 181 }
 182
 183
 184 /*
 185  * OSP tries to maintain pool of available objects so that calls to create
 186  * objects don't block most of time
 187  *
 188  * each time OSP gets connected to OST, we should start from precreation cleanup
 189  */
 190 static inline int osp_precreate_running(struct osp_device *d)
 191 {
 192         return !!(d->opd_pre_thread.t_flags & SVC_RUNNING);
 193 }
 194
 195 static inline int osp_precreate_stopped(struct osp_device *d)
 196 {
 197         return !!(d->opd_pre_thread.t_flags & SVC_STOPPED);
 198 }
 199
 200 static inline int osp_precreate_near_empty_nolock(struct osp_device *d)
 201 {
 202         int window = d->opd_pre_last_created - d->opd_pre_used_id;
 203
 204         /* don't consider new precreation till OST is healty and
 205          * has free space */
 206         return ((window - d->opd_pre_reserved < d->opd_pre_grow_count / 2) &&
 207                 (d->opd_pre_status == 0));
 208 }
 209
 210 static inline int osp_precreate_near_empty(struct osp_device *d)
 211 {
 212         int rc;
 213
 214         /* XXX: do we really need locking here? */
 215         cfs_spin_lock(&d->opd_pre_lock);
 216         rc = osp_precreate_near_empty_nolock(d);
 217         cfs_spin_unlock(&d->opd_pre_lock);
 218         return rc;
 219 }
 220
 221 static int osp_precreate_send(struct osp_device *d)
 222 {
 223         struct ptlrpc_request   *req;
 224         struct obd_import       *imp;
 225         struct ost_body         *body;
 226         int                      rc, grow, diff;
 227
 228         ENTRY;
 229
 230         /* don't precreate new objects till OST healthy and has free space */
 231         if (unlikely(d->opd_pre_status)) {
 232                 CDEBUG(D_INFO, "%s: don't send new precreate: rc = %d\n",
 233                        d->opd_obd->obd_name, d->opd_pre_status);
 234                 RETURN(0);
 235         }
 236
 237         /*
 238          * if not connection/initialization is compeleted, ignore
 239          */
 240         imp = d->opd_obd->u.cli.cl_import;
 241         LASSERT(imp);
 242
 243         req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
 244         if (req == NULL)
 245                 RETURN(-ENOMEM);
 246         req->rq_request_portal = OST_CREATE_PORTAL;
 247         /* we should not resend create request - anyway we will have delorphan
 248          * and kill these objects */
 249         req->rq_no_delay = req->rq_no_resend = 1;
 250
 251         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 252         if (rc) {
 253                 ptlrpc_request_free(req);
 254                 RETURN(rc);
 255         }
 256
 257         cfs_spin_lock(&d->opd_pre_lock);
 258         if (d->opd_pre_grow_count > d->opd_pre_max_grow_count / 2)
 259                 d->opd_pre_grow_count = d->opd_pre_max_grow_count / 2;
 260         grow = d->opd_pre_grow_count;
 261         cfs_spin_unlock(&d->opd_pre_lock);
 262
 263         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 264         LASSERT(body);
 265         body->oa.o_id = d->opd_pre_last_created + grow;
 266         body->oa.o_seq = FID_SEQ_OST_MDT0; /* XXX: support for CMD? */
 267         body->oa.o_valid = OBD_MD_FLGROUP;
 268
 269         ptlrpc_request_set_replen(req);
 270
 271         rc = ptlrpc_queue_wait(req);
 272         if (rc) {
 273                 CERROR("%s: can't precreate: rc = %d\n",
 274                        d->opd_obd->obd_name, rc);
 275                 GOTO(out_req, rc);
 276         }
 277         LASSERT(req->rq_transno == 0);
 278
 279         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 280         if (body == NULL)
 281                 GOTO(out_req, rc = -EPROTO);
 282
 283         CDEBUG(D_HA, "new last_created %lu\n", (unsigned long) body->oa.o_id);
 284         LASSERT(body->oa.o_id > d->opd_pre_used_id);
 285
 286         diff = body->oa.o_id - d->opd_pre_last_created;
 287
 288         cfs_spin_lock(&d->opd_pre_lock);
 289         if (diff < grow) {
 290                 /* the OST has not managed to create all the
 291                  * objects we asked for */
 292                 d->opd_pre_grow_count = max(diff, OST_MIN_PRECREATE);
 293                 d->opd_pre_grow_slow = 1;
 294         } else {
 295                 /* the OST is able to keep up with the work,
 296                  * we could consider increasing grow_count
 297                  * next time if needed */
 298                 d->opd_pre_grow_slow = 0;
 299         }
 300         d->opd_pre_last_created = body->oa.o_id;
 301         cfs_spin_unlock(&d->opd_pre_lock);
 302         CDEBUG(D_OTHER, "current precreated pool: %llu-%llu\n",
 303                d->opd_pre_used_id, d->opd_pre_last_created);
 304
 305 out_req:
 306         /* now we can wakeup all users awaiting for objects */
 307         osp_pre_update_status(d, rc);
 308         cfs_waitq_signal(&d->opd_pre_user_waitq);
 309
 310         ptlrpc_req_finished(req);
 311         RETURN(rc);
 312 }
 313
 314
 315 static int osp_get_lastid_from_ost(struct osp_device *d)
 316 {
 317         struct ptlrpc_request   *req;
 318         struct obd_import       *imp;
 319         obd_id                  *reply;
 320         char                    *tmp;
 321         int                      rc;
 322
 323         imp = d->opd_obd->u.cli.cl_import;
 324         LASSERT(imp);
 325
 326         req = ptlrpc_request_alloc(imp, &RQF_OST_GET_INFO_LAST_ID);
 327         if (req == NULL)
 328                 RETURN(-ENOMEM);
 329
 330         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
 331                              RCL_CLIENT, sizeof(KEY_LAST_ID));
 332         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
 333         if (rc) {
 334                 ptlrpc_request_free(req);
 335                 RETURN(rc);
 336         }
 337
 338         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
 339         memcpy(tmp, KEY_LAST_ID, sizeof(KEY_LAST_ID));
 340
 341         req->rq_no_delay = req->rq_no_resend = 1;
 342         ptlrpc_request_set_replen(req);
 343         rc = ptlrpc_queue_wait(req);
 344         if (rc) {
 345                 /* bad-bad OST.. let sysadm sort this out */
 346                 ptlrpc_set_import_active(imp, 0);
 347                 GOTO(out, rc);
 348         }
 349
 350         reply = req_capsule_server_get(&req->rq_pill, &RMF_OBD_ID);
 351         if (reply == NULL)
 352                 GOTO(out, rc = -EPROTO);
 353
 354         d->opd_last_used_id = *reply;
 355         CDEBUG(D_HA, "%s: got last_id "LPU64" from OST\n",
 356                d->opd_obd->obd_name, d->opd_last_used_id);
 357
 358 out:
 359         ptlrpc_req_finished(req);
 360         RETURN(rc);
 361
 362 }
 363
 364 /**
 365  * asks OST to clean precreate orphans
 366  * and gets next id for new objects
 367  */
 368 static int osp_precreate_cleanup_orphans(struct osp_device *d)
 369 {
 370         struct ptlrpc_request   *req = NULL;
 371         struct obd_import       *imp;
 372         struct ost_body         *body;
 373         int                      rc;
 374
 375         ENTRY;
 376
 377         LASSERT(d->opd_recovery_completed);
 378         LASSERT(d->opd_pre_reserved == 0);
 379
 380         CDEBUG(D_HA, "%s: going to cleanup orphans since "LPU64"\n",
 381                 d->opd_obd->obd_name, d->opd_last_used_id);
 382
 383         if (d->opd_last_used_id < 2) {
 384                 /* lastid looks strange... ask OST */
 385                 rc = osp_get_lastid_from_ost(d);
 386                 if (rc)
 387                         GOTO(out, rc);
 388         }
 389
 390         imp = d->opd_obd->u.cli.cl_import;
 391         LASSERT(imp);
 392
 393         req = ptlrpc_request_alloc(imp, &RQF_OST_CREATE);
 394         if (req == NULL)
 395                 GOTO(out, rc = -ENOMEM);
 396
 397         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
 398         if (rc) {
 399                 ptlrpc_request_free(req);
 400                 GOTO(out, rc);
 401         }
 402
 403         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 404         if (body == NULL)
 405                 GOTO(out, rc = -EPROTO);
 406
 407         body->oa.o_flags = OBD_FL_DELORPHAN;
 408         body->oa.o_valid = OBD_MD_FLFLAGS | OBD_MD_FLGROUP;
 409         body->oa.o_seq = FID_SEQ_OST_MDT0;
 410
 411         body->oa.o_id = d->opd_last_used_id;
 412
 413         ptlrpc_request_set_replen(req);
 414
 415         /* Don't resend the delorphan req */
 416         req->rq_no_resend = req->rq_no_delay = 1;
 417
 418         rc = ptlrpc_queue_wait(req);
 419         if (rc)
 420                 GOTO(out, rc);
 421
 422         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
 423         if (body == NULL)
 424                 GOTO(out, rc = -EPROTO);
 425
 426         /*
 427          * OST provides us with id new pool starts from in body->oa.o_id
 428          */
 429         cfs_spin_lock(&d->opd_pre_lock);
 430         if (le64_to_cpu(d->opd_last_used_id) > body->oa.o_id) {
 431                 d->opd_pre_grow_count = OST_MIN_PRECREATE +
 432                                         le64_to_cpu(d->opd_last_used_id) -
 433                                         body->oa.o_id;
 434                 d->opd_pre_last_created = le64_to_cpu(d->opd_last_used_id) + 1;
 435         } else {
 436                 d->opd_pre_grow_count = OST_MIN_PRECREATE;
 437                 d->opd_pre_last_created = body->oa.o_id + 1;
 438         }
 439         d->opd_pre_used_id = d->opd_pre_last_created - 1;
 440         d->opd_pre_grow_slow = 0;
 441         cfs_spin_unlock(&d->opd_pre_lock);
 442
 443         CDEBUG(D_HA, "Got last_id "LPU64" from OST, last_used is "LPU64
 444                ", next "LPU64"\n", body->oa.o_id,
 445                le64_to_cpu(d->opd_last_used_id), d->opd_pre_used_id);
 446
 447 out:
 448         if (req)
 449                 ptlrpc_req_finished(req);
 450
 451         RETURN(rc);
 452 }
 453
 454 /*
 455  * the function updates current precreation status used: functional or not
 456  *
 457  * rc is a last code from the transport, rc == 0 meaning transport works
 458  * well and users of lod can use objects from this OSP
 459  *
 460  * the status depends on current usage of OST
 461  */
 462 void osp_pre_update_status(struct osp_device *d, int rc)
 463 {
 464         struct obd_statfs       *msfs = &d->opd_statfs;
 465         int                      old = d->opd_pre_status;
 466         __u64                    used;
 467
 468         d->opd_pre_status = rc;
 469         if (rc)
 470                 goto out;
 471
 472         if (likely(msfs->os_type)) {
 473                 used = min_t(__u64, (msfs->os_blocks - msfs->os_bfree) >> 10,
 474                                     1 << 30);
 475                 if ((msfs->os_ffree < 32) || (msfs->os_bavail < used)) {
 476                         d->opd_pre_status = -ENOSPC;
 477                         if (old != -ENOSPC)
 478                                 CDEBUG(D_INFO, "%s: status: "LPU64" blocks, "
 479                                        LPU64" free, "LPU64" used, "LPU64" "
 480                                        "avail -> %d: rc = %d\n",
 481                                        d->opd_obd->obd_name, msfs->os_blocks,
 482                                        msfs->os_bfree, used, msfs->os_bavail,
 483                                        d->opd_pre_status, rc);
 484                         CDEBUG(D_INFO,
 485                                "non-commited changes: %lu, in progress: %u\n",
 486                                d->opd_syn_changes, d->opd_syn_rpc_in_progress);
 487                 } else if (old == -ENOSPC) {
 488                         d->opd_pre_status = 0;
 489                         d->opd_pre_grow_slow = 0;
 490                         d->opd_pre_grow_count = OST_MIN_PRECREATE;
 491                         cfs_waitq_signal(&d->opd_pre_waitq);
 492                         CDEBUG(D_INFO, "%s: no space: "LPU64" blocks, "LPU64
 493                                " free, "LPU64" used, "LPU64" avail -> %d: "
 494                                "rc = %d\n", d->opd_obd->obd_name,
 495                                msfs->os_blocks, msfs->os_bfree, used,
 496                                msfs->os_bavail, d->opd_pre_status, rc);
 497                 }
 498         }
 499
 500 out:
 501         cfs_waitq_signal(&d->opd_pre_user_waitq);
 502 }
 503
 504 static int osp_precreate_thread(void *_arg)
 505 {
 506         struct osp_device       *d = _arg;
 507         struct ptlrpc_thread    *thread = &d->opd_pre_thread;
 508         struct l_wait_info       lwi = { 0 };
 509         char                     pname[16];
 510         int                      rc;
 511
 512         ENTRY;
 513
 514         sprintf(pname, "osp-pre-%u\n", d->opd_index);
 515         cfs_daemonize(pname);
 516
 517         cfs_spin_lock(&d->opd_pre_lock);
 518         thread->t_flags = SVC_RUNNING;
 519         cfs_spin_unlock(&d->opd_pre_lock);
 520         cfs_waitq_signal(&thread->t_ctl_waitq);
 521
 522         while (osp_precreate_running(d)) {
 523                 /*
 524                  * need to be connected to OST
 525                  */
 526                 while (osp_precreate_running(d)) {
 527                         l_wait_event(d->opd_pre_waitq,
 528                                      !osp_precreate_running(d) ||
 529                                      d->opd_new_connection, &lwi);
 530
 531                         if (!osp_precreate_running(d))
 532                                 break;
 533
 534                         if (!d->opd_new_connection)
 535                                 continue;
 536
 537                         /* got connected */
 538                         d->opd_new_connection = 0;
 539                         d->opd_got_disconnected = 0;
 540                         break;
 541                 }
 542
 543                 osp_statfs_update(d);
 544
 545                 /*
 546                  * wait for local recovery to finish, so we can cleanup orphans
 547                  * orphans are all objects since "last used" (assigned), but
 548                  * there might be objects reserved and in some cases they won't
 549                  * be used. we can't cleanup them till we're sure they won't be
 550                  * used. so we block new reservations and wait till all reserved
 551                  * objects either user or released.
 552                  */
 553                 l_wait_event(d->opd_pre_waitq, (!d->opd_pre_reserved &&
 554                                                 d->opd_recovery_completed) ||
 555                              !osp_precreate_running(d) ||
 556                              d->opd_got_disconnected, &lwi);
 557
 558                 if (osp_precreate_running(d) && !d->opd_got_disconnected) {
 559                         rc = osp_precreate_cleanup_orphans(d);
 560                         if (rc) {
 561                                 CERROR("%s: cannot cleanup orphans: rc = %d\n",
 562                                        d->opd_obd->obd_name,  rc);
 563                                 /* we can't proceed from here, OST seem to
 564                                  * be in a bad shape, better to wait for
 565                                  * a new instance of the server and repeat
 566                                  * from the beginning. notify possible waiters
 567                                  * this OSP isn't quite functional yet */
 568                                 osp_pre_update_status(d, rc);
 569                                 cfs_waitq_signal(&d->opd_pre_user_waitq);
 570                                 l_wait_event(d->opd_pre_waitq,
 571                                              !osp_precreate_running(d) ||
 572                                              d->opd_new_connection, &lwi);
 573                                 continue;
 574
 575                         }
 576                 }
 577
 578                 /*
 579                  * connected, can handle precreates now
 580                  */
 581                 while (osp_precreate_running(d)) {
 582                         l_wait_event(d->opd_pre_waitq,
 583                                      !osp_precreate_running(d) ||
 584                                      osp_precreate_near_empty(d) ||
 585                                      osp_statfs_need_update(d) ||
 586                                      d->opd_got_disconnected, &lwi);
 587
 588                         if (!osp_precreate_running(d))
 589                                 break;
 590
 591                         /* something happened to the connection
 592                          * have to start from the beginning */
 593                         if (d->opd_got_disconnected)
 594                                 break;
 595
 596                         if (osp_statfs_need_update(d))
 597                                 osp_statfs_update(d);
 598
 599                         if (osp_precreate_near_empty(d)) {
 600                                 rc = osp_precreate_send(d);
 601                                 /* osp_precreate_send() sets opd_pre_status
 602                                  * in case of error, that prevent the using of
 603                                  * failed device. */
 604                                 if (rc != 0 && rc != -ENOSPC &&
 605                                     rc != -ETIMEDOUT && rc != -ENOTCONN)
 606                                         CERROR("%s: cannot precreate objects:"
 607                                                " rc = %d\n",
 608                                                d->opd_obd->obd_name, rc);
 609                         }
 610                 }
 611         }
 612
 613         thread->t_flags = SVC_STOPPED;
 614         cfs_waitq_signal(&thread->t_ctl_waitq);
 615
 616         RETURN(0);
 617 }
 618
 619 static int osp_precreate_ready_condition(struct osp_device *d)
 620 {
 621         __u64 next;
 622
 623         /* ready if got enough precreated objects */
 624         /* we need to wait for others (opd_pre_reserved) and our object (+1) */
 625         next = d->opd_pre_used_id + d->opd_pre_reserved + 1;
 626         if (next <= d->opd_pre_last_created)
 627                 return 1;
 628
 629         /* ready if OST reported no space and no destoys in progress */
 630         if (d->opd_syn_changes + d->opd_syn_rpc_in_progress == 0 &&
 631             d->opd_pre_status != 0)
 632                 return 1;
 633
 634         return 0;
 635 }
 636
 637 static int osp_precreate_timeout_condition(void *data)
 638 {
 639         struct osp_device *d = data;
 640
 641         LCONSOLE_WARN("%s: slow creates, last="LPU64", next="LPU64", "
 642                       "reserved="LPU64", syn_changes=%lu, "
 643                       "syn_rpc_in_progress=%d, status=%d\n",
 644                       d->opd_obd->obd_name, d->opd_pre_last_created,
 645                       d->opd_pre_used_id, d->opd_pre_reserved,
 646                       d->opd_syn_changes, d->opd_syn_rpc_in_progress,
 647                       d->opd_pre_status);
 648
 649         return 0;
 650 }
 651
 652 /*
 653  * called to reserve object in the pool
 654  * return codes:
 655  *  ENOSPC - no space on corresponded OST
 656  *  EAGAIN - precreation is in progress, try later
 657  *  EIO    - no access to OST
 658  */
 659 int osp_precreate_reserve(const struct lu_env *env, struct osp_device *d)
 660 {
 661         struct l_wait_info       lwi;
 662         cfs_time_t               expire = cfs_time_shift(obd_timeout);
 663         int                      precreated, rc;
 664         int                      count = 0;
 665
 666         ENTRY;
 667
 668         LASSERT(d->opd_pre_last_created >= d->opd_pre_used_id);
 669
 670         lwi = LWI_TIMEOUT(cfs_time_seconds(obd_timeout),
 671                           osp_precreate_timeout_condition, d);
 672
 673         /*
 674          * wait till:
 675          *  - preallocation is done
 676          *  - no free space expected soon
 677          *  - can't connect to OST for too long (obd_timeout)
 678          */
 679         while ((rc = d->opd_pre_status) == 0 || rc == -ENOSPC ||
 680                 rc == -ENODEV) {
 681                 if (unlikely(rc == -ENODEV)) {
 682                         if (cfs_time_aftereq(cfs_time_current(), expire))
 683                                 break;
 684                 }
 685
 686 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 3, 90, 0)
 687                 /*
 688                  * to address Andreas's concern on possible busy-loop
 689                  * between this thread and osp_precreate_send()
 690                  */
 691                 if (unlikely(count++ == 1000)) {
 692                         osp_precreate_timeout_condition(d);
 693                         LBUG();
 694                 }
 695 #endif
 696
 697                 /*
 698                  * increase number of precreations
 699                  */
 700                 if (d->opd_pre_grow_count < d->opd_pre_max_grow_count &&
 701                     d->opd_pre_grow_slow == 0 &&
 702                     (d->opd_pre_last_created - d->opd_pre_used_id <=
 703                      d->opd_pre_grow_count / 4 + 1)) {
 704                         cfs_spin_lock(&d->opd_pre_lock);
 705                         d->opd_pre_grow_slow = 1;
 706                         d->opd_pre_grow_count *= 2;
 707                         cfs_spin_unlock(&d->opd_pre_lock);
 708                 }
 709
 710                 /*
 711                  * we never use the last object in the window
 712                  */
 713                 cfs_spin_lock(&d->opd_pre_lock);
 714                 precreated = d->opd_pre_last_created - d->opd_pre_used_id;
 715                 if (precreated > d->opd_pre_reserved) {
 716                         d->opd_pre_reserved++;
 717                         cfs_spin_unlock(&d->opd_pre_lock);
 718                         rc = 0;
 719
 720                         /* XXX: don't wake up if precreation is in progress */
 721                         if (osp_precreate_near_empty_nolock(d))
 722                                 cfs_waitq_signal(&d->opd_pre_waitq);
 723
 724                         break;
 725                 }
 726                 cfs_spin_unlock(&d->opd_pre_lock);
 727
 728                 /*
 729                  * all precreated objects have been used and no-space
 730                  * status leave us no chance to succeed very soon
 731                  * but if there is destroy in progress, then we should
 732                  * wait till that is done - some space might be released
 733                  */
 734                 if (unlikely(rc == -ENOSPC)) {
 735                         if (d->opd_syn_changes) {
 736                                 /* force local commit to release space */
 737                                 dt_commit_async(env, d->opd_storage);
 738                         }
 739                         if (d->opd_syn_rpc_in_progress) {
 740                                 /* just wait till destroys are done */
 741                                 /* see l_wait_even() few lines below */
 742                         }
 743                         if (d->opd_syn_changes +
 744                             d->opd_syn_rpc_in_progress == 0) {
 745                                 /* no hope for free space */
 746                                 break;
 747                         }
 748                 }
 749
 750                 /* XXX: don't wake up if precreation is in progress */
 751                 cfs_waitq_signal(&d->opd_pre_waitq);
 752
 753                 l_wait_event(d->opd_pre_user_waitq,
 754                              osp_precreate_ready_condition(d), &lwi);
 755         }
 756
 757         RETURN(rc);
 758 }
 759
 760 /*
 761  * this function relies on reservation made before
 762  */
 763 __u64 osp_precreate_get_id(struct osp_device *d)
 764 {
 765         obd_id objid;
 766
 767         /* grab next id from the pool */
 768         cfs_spin_lock(&d->opd_pre_lock);
 769         LASSERT(d->opd_pre_used_id < d->opd_pre_last_created);
 770         objid = ++d->opd_pre_used_id;
 771         d->opd_pre_reserved--;
 772         /*
 773          * last_used_id must be changed along with getting new id otherwise
 774          * we might miscalculate gap causing object loss or leak
 775          */
 776         osp_update_last_id(d, objid);
 777         cfs_spin_unlock(&d->opd_pre_lock);
 778
 779         /*
 780          * probably main thread suspended orphan cleanup till
 781          * all reservations are released, see comment in
 782          * osp_precreate_thread() just before orphan cleanup
 783          */
 784         if (unlikely(d->opd_pre_reserved == 0 && d->opd_pre_status))
 785                 cfs_waitq_signal(&d->opd_pre_waitq);
 786
 787         return objid;
 788 }
 789
 790 /*
 791  *
 792  */
 793 int osp_object_truncate(const struct lu_env *env, struct dt_object *dt,
 794                         __u64 size)
 795 {
 796         struct osp_device       *d = lu2osp_dev(dt->do_lu.lo_dev);
 797         struct ptlrpc_request   *req = NULL;
 798         struct obd_import       *imp;
 799         struct ost_body         *body;
 800         struct obdo             *oa = NULL;
 801         int                      rc;
 802
 803         ENTRY;
 804
 805         imp = d->opd_obd->u.cli.cl_import;
 806         LASSERT(imp);
 807
 808         req = ptlrpc_request_alloc(imp, &RQF_OST_PUNCH);
 809         if (req == NULL)
 810                 RETURN(-ENOMEM);
 811
 812         /* XXX: capa support? */
 813         /* osc_set_capa_size(req, &RMF_CAPA1, capa); */
 814         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
 815         if (rc) {
 816                 ptlrpc_request_free(req);
 817                 RETURN(rc);
 818         }
 819
 820         /*
 821          * XXX: decide how do we do here with resend
 822          * if we don't resend, then client may see wrong file size
 823          * if we do resend, then MDS thread can get stuck for quite long
 824          */
 825         req->rq_no_resend = req->rq_no_delay = 1;
 826
 827         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
 828         ptlrpc_at_set_req_timeout(req);
 829
 830         OBD_ALLOC_PTR(oa);
 831         if (oa == NULL)
 832                 GOTO(out, rc = -ENOMEM);
 833
 834         rc = fid_ostid_pack(lu_object_fid(&dt->do_lu), &oa->o_oi);
 835         LASSERT(rc == 0);
 836         oa->o_size = size;
 837         oa->o_blocks = OBD_OBJECT_EOF;
 838         oa->o_valid = OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
 839                       OBD_MD_FLID | OBD_MD_FLGROUP;
 840
 841         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
 842         LASSERT(body);
 843         lustre_set_wire_obdo(&body->oa, oa);
 844
 845         /* XXX: capa support? */
 846         /* osc_pack_capa(req, body, capa); */
 847
 848         ptlrpc_request_set_replen(req);
 849
 850         rc = ptlrpc_queue_wait(req);
 851         if (rc)
 852                 CERROR("can't punch object: %d\n", rc);
 853 out:
 854         ptlrpc_req_finished(req);
 855         if (oa)
 856                 OBD_FREE_PTR(oa);
 857         RETURN(rc);
 858 }
 859
 860 int osp_init_precreate(struct osp_device *d)
 861 {
 862         struct l_wait_info       lwi = { 0 };
 863         int                      rc;
 864
 865         ENTRY;
 866
 867         /* initially precreation isn't ready */
 868         d->opd_pre_status = -EAGAIN;
 869         d->opd_pre_used_id = 0;
 870         d->opd_pre_last_created = 0;
 871         d->opd_pre_reserved = 0;
 872         d->opd_got_disconnected = 1;
 873         d->opd_pre_grow_slow = 0;
 874         d->opd_pre_grow_count = OST_MIN_PRECREATE;
 875         d->opd_pre_min_grow_count = OST_MIN_PRECREATE;
 876         d->opd_pre_max_grow_count = OST_MAX_PRECREATE;
 877
 878         cfs_spin_lock_init(&d->opd_pre_lock);
 879         cfs_waitq_init(&d->opd_pre_waitq);
 880         cfs_waitq_init(&d->opd_pre_user_waitq);
 881         cfs_waitq_init(&d->opd_pre_thread.t_ctl_waitq);
 882
 883         /*
 884          * Initialize statfs-related things
 885          */
 886         d->opd_statfs_maxage = 5; /* default update interval */
 887         d->opd_statfs_fresh_till = cfs_time_shift(-1000);
 888         CDEBUG(D_OTHER, "current %llu, fresh till %llu\n",
 889                (unsigned long long)cfs_time_current(),
 890                (unsigned long long)d->opd_statfs_fresh_till);
 891         cfs_timer_init(&d->opd_statfs_timer, osp_statfs_timer_cb, d);
 892
 893         /*
 894          * start thread handling precreation and statfs updates
 895          */
 896         rc = cfs_create_thread(osp_precreate_thread, d, 0);
 897         if (rc < 0) {
 898                 CERROR("can't start precreate thread %d\n", rc);
 899                 RETURN(rc);
 900         }
 901
 902         l_wait_event(d->opd_pre_thread.t_ctl_waitq,
 903                      osp_precreate_running(d) || osp_precreate_stopped(d),
 904                      &lwi);
 905
 906         RETURN(0);
 907 }
 908
 909 void osp_precreate_fini(struct osp_device *d)
 910 {
 911         struct ptlrpc_thread *thread = &d->opd_pre_thread;
 912
 913         ENTRY;
 914
 915         cfs_timer_disarm(&d->opd_statfs_timer);
 916
 917         thread->t_flags = SVC_STOPPING;
 918         cfs_waitq_signal(&d->opd_pre_waitq);
 919
 920         cfs_wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
 921
 922         EXIT;
 923 }
 924