lustre/osc/osc_create.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) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, Whamcloud, 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/osc/osc_create.c
  37  * For testing and management it is treated as an obd_device,
  38  * although * it does not export a full OBD method table (the
  39  * requests are coming * in over the wire, so object target modules
  40  * do not have a full * method table.)
  41  *
  42  * Author: Peter Braam <braam@clusterfs.com>
  43  */
  44
  45 #define DEBUG_SUBSYSTEM S_OSC
  46
  47 #ifdef __KERNEL__
  48 # include <libcfs/libcfs.h>
  49 #else /* __KERNEL__ */
  50 # include <liblustre.h>
  51 #endif
  52
  53 #ifdef  __CYGWIN__
  54 # include <ctype.h>
  55 #endif
  56
  57 #include <lustre_dlm.h>
  58 #include <obd_class.h>
  59 #include "osc_internal.h"
  60
  61 /* XXX need AT adjust ? */
  62 #define osc_create_timeout      (obd_timeout / 2)
  63
  64 struct osc_create_async_args {
  65         struct osc_creator      *rq_oscc;
  66         struct lov_stripe_md    *rq_lsm;
  67         struct obd_info         *rq_oinfo;
  68         int                      rq_grow_count;
  69 };
  70
  71 static int oscc_internal_create(struct osc_creator *oscc);
  72 static int handle_async_create(struct ptlrpc_request *req, int rc);
  73
  74 static int osc_interpret_create(const struct lu_env *env,
  75                                 struct ptlrpc_request *req, void *data, int rc)
  76 {
  77         struct osc_create_async_args *args = ptlrpc_req_async_args(req);
  78         struct osc_creator *oscc = args->rq_oscc;
  79         struct ost_body *body = NULL;
  80         struct ptlrpc_request *fake_req, *pos;
  81         ENTRY;
  82
  83         if (req->rq_repmsg) {
  84                 body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
  85                 if (body == NULL && rc == 0)
  86                         rc = -EPROTO;
  87         }
  88
  89         LASSERT(oscc && (oscc->oscc_obd != LP_POISON));
  90
  91         cfs_spin_lock(&oscc->oscc_lock);
  92         oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
  93         switch (rc) {
  94         case 0: {
  95                 if (body) {
  96                         int diff =ostid_id(&body->oa.o_oi)- oscc->oscc_last_id;
  97
  98                         /* oscc_internal_create() stores the original value of
  99                          * grow_count in osc_create_async_args::rq_grow_count.
 100                          * We can't compare against oscc_grow_count directly,
 101                          * because it may have been increased while the RPC
 102                          * is in flight, so we would always find ourselves
 103                          * having created fewer objects and decreasing the
 104                          * precreate request size.  b=18577 */
 105                         if (diff < args->rq_grow_count) {
 106                                 /* the OST has not managed to create all the
 107                                  * objects we asked for */
 108                                 oscc->oscc_grow_count = max(diff,
 109                                                             OST_MIN_PRECREATE);
 110                                 /* don't bump grow_count next time */
 111                                 oscc->oscc_flags |= OSCC_FLAG_LOW;
 112                         } else {
 113                                 /* the OST is able to keep up with the work,
 114                                  * we could consider increasing grow_count
 115                                  * next time if needed */
 116                                 oscc->oscc_flags &= ~OSCC_FLAG_LOW;
 117                         }
 118                         oscc->oscc_last_id = ostid_id(&body->oa.o_oi);
 119                 }
 120                 cfs_spin_unlock(&oscc->oscc_lock);
 121                 break;
 122         }
 123         case -EROFS:
 124                 oscc->oscc_flags |= OSCC_FLAG_RDONLY;
 125         case -ENOSPC:
 126         case -EFBIG:
 127                 if (rc != -EROFS) {
 128                         oscc->oscc_flags |= OSCC_FLAG_NOSPC;
 129                         if (body && rc == -ENOSPC) {
 130                                 oscc->oscc_last_id = body->oa.o_id;
 131                                 oscc->oscc_grow_count = OST_MIN_PRECREATE;
 132
 133                                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) &&
 134                                     (body->oa.o_flags & OBD_FL_NOSPC_BLK))
 135                                         oscc->oscc_flags |= OSCC_FLAG_NOSPC_BLK;
 136                                 else
 137                                         rc = 0;
 138                         }
 139                 }
 140                 cfs_spin_unlock(&oscc->oscc_lock);
 141                 DEBUG_REQ(D_INODE, req, "OST out of space, flagging");
 142                 break;
 143         case -EIO: {
 144                 /* filter always set body->oa.o_id as the last_id
 145                  * of filter (see filter_handle_precreate for detail)*/
 146                 if (body && body->oa.o_id > oscc->oscc_last_id)
 147                         oscc->oscc_last_id = body->oa.o_id;
 148                 cfs_spin_unlock(&oscc->oscc_lock);
 149                 break;
 150         }
 151         case -EINTR:
 152         case -EWOULDBLOCK: {
 153                 /* aka EAGAIN we should not delay create if import failed -
 154                  * this avoid client stick in create and avoid race with
 155                  * delorphan */
 156                 /* EINTR say - old create request is killed due mds<>ost
 157                  * eviction - OSCC_FLAG_RECOVERING can already set due
 158                  * IMP_DISCONN event */
 159                 oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 160                 /* oscc->oscc_grow_count = OST_MIN_PRECREATE; */
 161                 cfs_spin_unlock(&oscc->oscc_lock);
 162                 break;
 163         }
 164         default: {
 165                 oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 166                 oscc->oscc_grow_count = OST_MIN_PRECREATE;
 167                 cfs_spin_unlock(&oscc->oscc_lock);
 168                 DEBUG_REQ(D_ERROR, req,
 169                           "Unknown rc %d from async create: failing oscc", rc);
 170                 ptlrpc_fail_import(req->rq_import,
 171                                    lustre_msg_get_conn_cnt(req->rq_reqmsg));
 172         }
 173         }
 174
 175         CDEBUG(D_HA, "preallocated through id "LPU64" (next to use "LPU64")\n",
 176                oscc->oscc_last_id, oscc->oscc_next_id);
 177
 178         cfs_spin_lock(&oscc->oscc_lock);
 179         cfs_list_for_each_entry_safe(fake_req, pos,
 180                                      &oscc->oscc_wait_create_list, rq_list) {
 181                 if (handle_async_create(fake_req, rc) == -EAGAIN) {
 182                         oscc_internal_create(oscc);
 183                         /* sending request should be never fail because
 184                          * osc use preallocated requests pool */
 185                         GOTO(exit_wakeup, rc);
 186                 }
 187         }
 188         cfs_spin_unlock(&oscc->oscc_lock);
 189
 190 exit_wakeup:
 191         cfs_waitq_signal(&oscc->oscc_waitq);
 192         RETURN(rc);
 193 }
 194
 195 static int oscc_internal_create(struct osc_creator *oscc)
 196 {
 197         struct osc_create_async_args *args;
 198         struct ptlrpc_request *request;
 199         struct ost_body *body;
 200         ENTRY;
 201
 202         LASSERT_SPIN_LOCKED(&oscc->oscc_lock);
 203
 204         /* Do not check for a degraded OST here - bug21563/bug18539 */
 205         if (oscc->oscc_flags & OSCC_FLAG_RECOVERING) {
 206                 cfs_spin_unlock(&oscc->oscc_lock);
 207                 RETURN(0);
 208         }
 209
 210         /* we need check it before OSCC_FLAG_CREATING - because need
 211          * see lower number of precreate objects */
 212         if (oscc->oscc_grow_count < oscc->oscc_max_grow_count &&
 213             ((oscc->oscc_flags & OSCC_FLAG_LOW) == 0) &&
 214             (__s64)(oscc->oscc_last_id - oscc->oscc_next_id) <=
 215                    (oscc->oscc_grow_count / 4 + 1)) {
 216                 oscc->oscc_flags |= OSCC_FLAG_LOW;
 217                 oscc->oscc_grow_count *= 2;
 218         }
 219
 220         if (oscc->oscc_flags & OSCC_FLAG_CREATING) {
 221                 cfs_spin_unlock(&oscc->oscc_lock);
 222                 RETURN(0);
 223         }
 224
 225         if (oscc->oscc_grow_count > oscc->oscc_max_grow_count / 2)
 226                 oscc->oscc_grow_count = oscc->oscc_max_grow_count / 2;
 227
 228         oscc->oscc_flags |= OSCC_FLAG_CREATING;
 229         cfs_spin_unlock(&oscc->oscc_lock);
 230
 231         request = ptlrpc_request_alloc_pack(oscc->oscc_obd->u.cli.cl_import,
 232                                             &RQF_OST_CREATE,
 233                                             LUSTRE_OST_VERSION, OST_CREATE);
 234         if (request == NULL) {
 235                 cfs_spin_lock(&oscc->oscc_lock);
 236                 oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
 237                 cfs_spin_unlock(&oscc->oscc_lock);
 238                 RETURN(-ENOMEM);
 239         }
 240
 241         request->rq_request_portal = OST_CREATE_PORTAL;
 242         ptlrpc_at_set_req_timeout(request);
 243         body = req_capsule_client_get(&request->rq_pill, &RMF_OST_BODY);
 244         args = ptlrpc_req_async_args(request);
 245         args->rq_oscc = oscc;
 246
 247         cfs_spin_lock(&oscc->oscc_lock);
 248         args->rq_grow_count = oscc->oscc_grow_count;
 249
 250         if (likely(fid_seq_is_mdt(oscc->oscc_oa.o_seq))) {
 251                 body->oa.o_oi.oi_seq = oscc->oscc_oa.o_seq;
 252                 body->oa.o_oi.oi_id  = oscc->oscc_last_id +
 253                                        oscc->oscc_grow_count;
 254         } else {
 255                 /*Just warning here currently, since not sure how fid-on-ost
 256                  *will be implemented here */
 257                 CWARN("o_seq: "LPU64" is not indicate any MDTs.\n",
 258                        oscc->oscc_oa.o_seq);
 259         }
 260         cfs_spin_unlock(&oscc->oscc_lock);
 261
 262         body->oa.o_valid |= OBD_MD_FLID | OBD_MD_FLGROUP;
 263         CDEBUG(D_RPCTRACE, "prealloc through id "LPU64" (last seen "LPU64")\n",
 264                body->oa.o_id, oscc->oscc_last_id);
 265
 266         /* we should not resend create request - anyway we will have delorphan
 267          * and kill these objects */
 268         request->rq_no_delay = request->rq_no_resend = 1;
 269         ptlrpc_request_set_replen(request);
 270
 271         request->rq_interpret_reply = osc_interpret_create;
 272         ptlrpcd_add_req(request, PDL_POLICY_ROUND, -1);
 273
 274         RETURN(0);
 275 }
 276
 277 static int oscc_has_objects_nolock(struct osc_creator *oscc, int count)
 278 {
 279         return ((__s64)(oscc->oscc_last_id - oscc->oscc_next_id) >= count);
 280 }
 281
 282 static int oscc_has_objects(struct osc_creator *oscc, int count)
 283 {
 284         int have_objs;
 285
 286         cfs_spin_lock(&oscc->oscc_lock);
 287         have_objs = oscc_has_objects_nolock(oscc, count);
 288         cfs_spin_unlock(&oscc->oscc_lock);
 289
 290         return have_objs;
 291 }
 292
 293 static int oscc_wait_for_objects(struct osc_creator *oscc, int count)
 294 {
 295         int have_objs;
 296         int ost_unusable;
 297
 298         ost_unusable = oscc->oscc_obd->u.cli.cl_import->imp_invalid;
 299
 300         cfs_spin_lock(&oscc->oscc_lock);
 301         ost_unusable |= (OSCC_FLAG_NOSPC | OSCC_FLAG_RDONLY |
 302                          OSCC_FLAG_EXITING) & oscc->oscc_flags;
 303         have_objs = oscc_has_objects_nolock(oscc, count);
 304
 305         if (!ost_unusable && !have_objs)
 306                 /* they release lock himself */
 307                 have_objs = oscc_internal_create(oscc);
 308         else
 309                 cfs_spin_unlock(&oscc->oscc_lock);
 310
 311         return have_objs || ost_unusable;
 312 }
 313
 314 static int oscc_precreate(struct osc_creator *oscc)
 315 {
 316         struct l_wait_info lwi;
 317         int rc = 0;
 318         ENTRY;
 319
 320         if (oscc_has_objects(oscc, oscc->oscc_grow_count / 2))
 321                 RETURN(0);
 322
 323         /* we should be not block forever - because client's create rpc can
 324          * stick in mds for long time and forbid client reconnect */
 325         lwi = LWI_TIMEOUT(cfs_timeout_cap(cfs_time_seconds(osc_create_timeout)),
 326                           NULL, NULL);
 327
 328         rc = l_wait_event(oscc->oscc_waitq, oscc_wait_for_objects(oscc, 1), &lwi);
 329         RETURN(rc);
 330 }
 331
 332 static int oscc_in_sync(struct osc_creator *oscc)
 333 {
 334         int sync;
 335
 336         cfs_spin_lock(&oscc->oscc_lock);
 337         sync = oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS;
 338         cfs_spin_unlock(&oscc->oscc_lock);
 339
 340         return sync;
 341 }
 342
 343 /* decide if the OST has remaining object, return value :
 344         0 : the OST has remaining objects, may or may not send precreation RPC.
 345         1 : the OST has no remaining object, and the sent precreation RPC
 346             has not been completed yet.
 347         2 : the OST has no remaining object, and will not get any for
 348             a potentially very long time
 349      1000 : unusable
 350  */
 351 int osc_precreate(struct obd_export *exp)
 352 {
 353         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 354         struct obd_import *imp = exp->exp_imp_reverse;
 355         int rc;
 356         ENTRY;
 357
 358         LASSERT(oscc != NULL);
 359         if (imp != NULL && imp->imp_deactive)
 360                 GOTO(out_nolock, rc = 1000);
 361
 362         /* Handle critical states first */
 363         cfs_spin_lock(&oscc->oscc_lock);
 364         if (oscc->oscc_flags & OSCC_FLAG_NOSPC_BLK ||
 365             oscc->oscc_flags & OSCC_FLAG_RDONLY ||
 366             oscc->oscc_flags & OSCC_FLAG_EXITING)
 367                 GOTO(out, rc = 1000);
 368
 369         if ((oscc->oscc_flags & OSCC_FLAG_RECOVERING) ||
 370             (oscc->oscc_flags & OSCC_FLAG_DEGRADED))
 371                 GOTO(out, rc = 2);
 372
 373         if (oscc_has_objects_nolock(oscc, oscc->oscc_grow_count / 2))
 374                 GOTO(out, rc = 0);
 375
 376         /* Return 0, if we have at least one object - bug 22884 */
 377         rc = oscc_has_objects_nolock(oscc, 1) ? 0 : 1;
 378
 379         if (oscc->oscc_flags & OSCC_FLAG_NOSPC)
 380                 GOTO(out, (rc == 0) ? 0 : 1000);
 381
 382         /* Do not check for OSCC_FLAG_CREATING flag here, let
 383          * osc_precreate() call oscc_internal_create() and
 384          * adjust oscc_grow_count bug21563 */
 385         if (oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS)
 386                 GOTO(out, rc);
 387
 388         if (oscc_internal_create(oscc))
 389                 GOTO(out_nolock, rc = 1000);
 390
 391         RETURN(rc);
 392 out:
 393         cfs_spin_unlock(&oscc->oscc_lock);
 394 out_nolock:
 395         return rc;
 396 }
 397
 398 static int handle_async_create(struct ptlrpc_request *req, int rc)
 399 {
 400         struct osc_create_async_args *args = ptlrpc_req_async_args(req);
 401         struct osc_creator    *oscc = args->rq_oscc;
 402         struct lov_stripe_md  *lsm  = args->rq_lsm;
 403         struct obd_info       *oinfo = args->rq_oinfo;
 404         struct obdo           *oa = oinfo->oi_oa;
 405
 406         LASSERT_SPIN_LOCKED(&oscc->oscc_lock);
 407
 408         if(rc)
 409                 GOTO(out_wake, rc);
 410
 411         /* Handle the critical type errors first.
 412          * Should we also test cl_import state as well ? */
 413         if (oscc->oscc_flags & OSCC_FLAG_EXITING)
 414                 GOTO(out_wake, rc = -EIO);
 415
 416         if (oscc->oscc_flags & OSCC_FLAG_NOSPC_BLK)
 417                 GOTO(out_wake, rc = -ENOSPC);
 418
 419         if (oscc->oscc_flags & OSCC_FLAG_RDONLY)
 420                 GOTO(out_wake, rc = -EROFS);
 421
 422         /* should be try wait until recovery finished */
 423         if((oscc->oscc_flags & OSCC_FLAG_RECOVERING) ||
 424            (oscc->oscc_flags & OSCC_FLAG_DEGRADED))
 425                 RETURN(-EAGAIN);
 426
 427         if (oscc_has_objects_nolock(oscc, 1)) {
 428                 memcpy(oa, &oscc->oscc_oa, sizeof(*oa));
 429                 oa->o_id = oscc->oscc_next_id;
 430                 lsm->lsm_object_id = oscc->oscc_next_id;
 431                 oscc->oscc_next_id++;
 432
 433                 CDEBUG(D_RPCTRACE, " set oscc_next_id = "LPU64"\n",
 434                        oscc->oscc_next_id);
 435                 GOTO(out_wake, rc = 0);
 436         }
 437
 438         /* we don't have objects now - continue wait */
 439         RETURN(-EAGAIN);
 440
 441 out_wake:
 442
 443         rc = oinfo->oi_cb_up(oinfo, rc);
 444         ptlrpc_fakereq_finished(req);
 445
 446         RETURN(rc);
 447 }
 448
 449 static int async_create_interpret(const struct lu_env *env,
 450                                   struct ptlrpc_request *req, void *data,
 451                                   int rc)
 452 {
 453         struct osc_create_async_args *args = ptlrpc_req_async_args(req);
 454         struct osc_creator    *oscc = args->rq_oscc;
 455         int ret;
 456
 457         cfs_spin_lock(&oscc->oscc_lock);
 458         ret = handle_async_create(req, rc);
 459         cfs_spin_unlock(&oscc->oscc_lock);
 460
 461         return ret;
 462 }
 463
 464 int osc_create_async(struct obd_export *exp, struct obd_info *oinfo,
 465                      struct lov_stripe_md **ea, struct obd_trans_info *oti)
 466 {
 467         int rc;
 468         struct ptlrpc_request *fake_req;
 469         struct osc_create_async_args *args;
 470         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 471         struct obdo *oa = oinfo->oi_oa;
 472         ENTRY;
 473
 474         if ((oa->o_valid & OBD_MD_FLGROUP) && !fid_seq_is_mdt(oa->o_seq)) {
 475                 rc = osc_real_create(exp, oinfo->oi_oa, ea, oti);
 476                 rc = oinfo->oi_cb_up(oinfo, rc);
 477                 RETURN(rc);
 478         }
 479
 480         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 481             oa->o_flags == OBD_FL_RECREATE_OBJS) {
 482                 rc = osc_real_create(exp, oinfo->oi_oa, ea, oti);
 483                 rc = oinfo->oi_cb_up(oinfo, rc);
 484                 RETURN(rc);
 485         }
 486
 487         LASSERT((*ea) != NULL);
 488
 489         fake_req = ptlrpc_prep_fakereq(oscc->oscc_obd->u.cli.cl_import,
 490                                        osc_create_timeout,
 491                                        async_create_interpret);
 492         if (fake_req == NULL) {
 493                 rc = oinfo->oi_cb_up(oinfo, -ENOMEM);
 494                 RETURN(-ENOMEM);
 495         }
 496
 497         args = ptlrpc_req_async_args(fake_req);
 498         CLASSERT(sizeof(*args) <= sizeof(fake_req->rq_async_args));
 499
 500         args->rq_oscc  = oscc;
 501         args->rq_lsm   = *ea;
 502         args->rq_oinfo = oinfo;
 503
 504         cfs_spin_lock(&oscc->oscc_lock);
 505         /* try fast path */
 506         rc = handle_async_create(fake_req, 0);
 507         if (rc == -EAGAIN) {
 508                 /* We don't have any objects, wait until we get a reply. */
 509                 ptlrpcd_add_req(fake_req, PDL_POLICY_ROUND, -1);
 510                 cfs_list_add(&fake_req->rq_list,
 511                              &oscc->oscc_wait_create_list);
 512                 cfs_spin_unlock(&oscc->oscc_lock);
 513                 /* EAGAIN mean - request is delayed */
 514                 rc = 0;
 515         } else {
 516                 cfs_spin_unlock(&oscc->oscc_lock);
 517                 /* need free request if was error hit or
 518                  * objects already allocated */
 519                 ptlrpc_req_finished(fake_req);
 520         }
 521
 522         RETURN(rc);
 523 }
 524
 525 int osc_create(const struct lu_env *env, struct obd_export *exp,
 526                struct obdo *oa, struct lov_stripe_md **ea,
 527                struct obd_trans_info *oti)
 528 {
 529         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 530         struct obd_import  *imp  = exp->exp_obd->u.cli.cl_import;
 531         struct lov_stripe_md *lsm;
 532         int del_orphan = 0, rc = 0;
 533         ENTRY;
 534
 535         LASSERT(oa);
 536         LASSERT(ea);
 537         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
 538
 539         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 540             oa->o_flags == OBD_FL_RECREATE_OBJS) {
 541                 RETURN(osc_real_create(exp, oa, ea, oti));
 542         }
 543
 544         if (!fid_seq_is_mdt(oa->o_seq))
 545                 RETURN(osc_real_create(exp, oa, ea, oti));
 546
 547         /* this is the special case where create removes orphans */
 548         if (oa->o_valid & OBD_MD_FLFLAGS &&
 549             oa->o_flags == OBD_FL_DELORPHAN) {
 550                 cfs_spin_lock(&oscc->oscc_lock);
 551                 if (oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS) {
 552                         cfs_spin_unlock(&oscc->oscc_lock);
 553                         RETURN(-EBUSY);
 554                 }
 555                 if (!(oscc->oscc_flags & OSCC_FLAG_RECOVERING)) {
 556                         cfs_spin_unlock(&oscc->oscc_lock);
 557                         RETURN(0);
 558                 }
 559
 560                 oscc->oscc_flags |= OSCC_FLAG_SYNC_IN_PROGRESS;
 561                 /* seting flag LOW we prevent extra grow precreate size
 562                  * and enforce use last assigned size */
 563                 oscc->oscc_flags |= OSCC_FLAG_LOW;
 564                 cfs_spin_unlock(&oscc->oscc_lock);
 565                 CDEBUG(D_HA, "%s: oscc recovery started - delete to "LPU64"\n",
 566                        oscc->oscc_obd->obd_name, oscc->oscc_next_id - 1);
 567
 568                 del_orphan = 1;
 569
 570                 /* delete from next_id on up */
 571                 oa->o_valid |= OBD_MD_FLID;
 572                 oa->o_id = oscc->oscc_next_id - 1;
 573
 574                 rc = osc_real_create(exp, oa, ea, NULL);
 575
 576                 cfs_spin_lock(&oscc->oscc_lock);
 577                 oscc->oscc_flags &= ~OSCC_FLAG_SYNC_IN_PROGRESS;
 578                 if (rc == 0 || rc == -ENOSPC) {
 579                         struct obd_connect_data *ocd;
 580
 581                         if (rc == -ENOSPC) {
 582                                 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
 583                                 if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 584                                     (oa->o_flags & OBD_FL_NOSPC_BLK))
 585                                         oscc->oscc_flags |= OSCC_FLAG_NOSPC_BLK;
 586                         }
 587                         oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
 588
 589                         oscc->oscc_last_id = oa->o_id;
 590                         ocd = &imp->imp_connect_data;
 591                         if (ocd->ocd_connect_flags & OBD_CONNECT_SKIP_ORPHAN) {
 592                                 /*
 593                                  * The OST reports back in oa->o_id from where
 594                                  * we should restart in order to skip orphan
 595                                  * objects
 596                                  */
 597                                 CDEBUG(D_HA, "%s: Skip orphan set, reset last "
 598                                        "objid\n", oscc->oscc_obd->obd_name);
 599                                 oscc->oscc_next_id = oa->o_id + 1;
 600                         }
 601
 602                         /* sanity check for next objid. see bug 17025 */
 603                         LASSERT(oscc->oscc_next_id == oa->o_id + 1);
 604
 605                         CDEBUG(D_HA, "%s: oscc recovery finished, last_id: "
 606                                LPU64", rc: %d\n", oscc->oscc_obd->obd_name,
 607                                oscc->oscc_last_id, rc);
 608                 } else {
 609                         CDEBUG(D_ERROR, "%s: oscc recovery failed: %d\n",
 610                                oscc->oscc_obd->obd_name, rc);
 611                 }
 612
 613                 cfs_waitq_signal(&oscc->oscc_waitq);
 614                 cfs_spin_unlock(&oscc->oscc_lock);
 615
 616                 if (rc < 0)
 617                         RETURN(rc);
 618         }
 619
 620         lsm = *ea;
 621         if (lsm == NULL) {
 622                 rc = obd_alloc_memmd(exp, &lsm);
 623                 if (rc < 0)
 624                         RETURN(rc);
 625         }
 626
 627         while (1) {
 628                 if (oscc_in_sync(oscc))
 629                         CDEBUG(D_HA,"%s: oscc recovery in progress, waiting\n",
 630                                oscc->oscc_obd->obd_name);
 631
 632                 rc = oscc_precreate(oscc);
 633                 if (rc)
 634                         CDEBUG(D_HA,"%s: error create %d\n",
 635                                oscc->oscc_obd->obd_name, rc);
 636
 637                 cfs_spin_lock(&oscc->oscc_lock);
 638
 639                 /* wakeup but recovery did not finished */
 640                 if ((oscc->oscc_obd->u.cli.cl_import->imp_invalid) ||
 641                     (oscc->oscc_flags & OSCC_FLAG_RECOVERING)) {
 642                         rc = -EIO;
 643                         cfs_spin_unlock(&oscc->oscc_lock);
 644                         break;
 645                 }
 646
 647                 if (oscc->oscc_flags & OSCC_FLAG_NOSPC_BLK) {
 648                         rc = -ENOSPC;
 649                         cfs_spin_unlock(&oscc->oscc_lock);
 650                         break;
 651                 }
 652
 653                 if (oscc->oscc_flags & OSCC_FLAG_RDONLY) {
 654                         rc = -EROFS;
 655                         cfs_spin_unlock(&oscc->oscc_lock);
 656                         break;
 657                 }
 658
 659                 // Should we report -EIO error ?
 660                 if (oscc->oscc_flags & OSCC_FLAG_EXITING) {
 661                         cfs_spin_unlock(&oscc->oscc_lock);
 662                         break;
 663                 }
 664
 665                 /**
 666                  * If this is DELORPHAN process, no need create object here,
 667                  * otherwise this will create a gap of object id, and MDS
 668                  * might create some orphan log (mds_lov_update_objids), then
 669                  * remove objects wrongly on OST. Bug 21379.
 670                  */
 671                 if (oa->o_valid & OBD_MD_FLFLAGS &&
 672                         oa->o_flags == OBD_FL_DELORPHAN) {
 673                         cfs_spin_unlock(&oscc->oscc_lock);
 674                         break;
 675                 }
 676
 677                 if (oscc_has_objects_nolock(oscc, 1)) {
 678                         memcpy(oa, &oscc->oscc_oa, sizeof(*oa));
 679                         oa->o_id = oscc->oscc_next_id;
 680                         lsm->lsm_object_id = oscc->oscc_next_id;
 681                         *ea = lsm;
 682                         oscc->oscc_next_id++;
 683                         cfs_spin_unlock(&oscc->oscc_lock);
 684
 685                         CDEBUG(D_RPCTRACE, "%s: set oscc_next_id = "LPU64"\n",
 686                                exp->exp_obd->obd_name, oscc->oscc_next_id);
 687                         break;
 688                 }
 689
 690                 if (oscc->oscc_flags & OSCC_FLAG_NOSPC) {
 691                         rc = -ENOSPC;
 692                         cfs_spin_unlock(&oscc->oscc_lock);
 693                         break;
 694                 }
 695
 696                 cfs_spin_unlock(&oscc->oscc_lock);
 697         }
 698
 699         if (rc == 0) {
 700                 CDEBUG(D_INFO, "%s: returning objid "LPU64"\n",
 701                        obd2cli_tgt(oscc->oscc_obd), lsm->lsm_object_id);
 702         } else {
 703                 if (*ea == NULL)
 704                         obd_free_memmd(exp, &lsm);
 705                 if (del_orphan != 0 && rc != -EIO)
 706                         /* Ignore non-IO precreate error for clear orphan */
 707                         rc = 0;
 708         }
 709         RETURN(rc);
 710 }
 711
 712 void oscc_init(struct obd_device *obd)
 713 {
 714         struct osc_creator *oscc;
 715
 716         if (obd == NULL)
 717                 return;
 718
 719         oscc = &obd->u.cli.cl_oscc;
 720
 721         memset(oscc, 0, sizeof(*oscc));
 722
 723         cfs_waitq_init(&oscc->oscc_waitq);
 724         cfs_spin_lock_init(&oscc->oscc_lock);
 725         oscc->oscc_obd = obd;
 726         oscc->oscc_grow_count = OST_MIN_PRECREATE;
 727         oscc->oscc_max_grow_count = OST_MAX_PRECREATE;
 728
 729         oscc->oscc_next_id = 2;
 730         oscc->oscc_last_id = 1;
 731         oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 732
 733         CFS_INIT_LIST_HEAD(&oscc->oscc_wait_create_list);
 734
 735         /* XXX the export handle should give the oscc the last object */
 736         /* oed->oed_oscc.oscc_last_id = exph->....; */
 737 }
 738
 739 void oscc_fini(struct obd_device *obd)
 740 {
 741         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
 742         ENTRY;
 743
 744
 745         cfs_spin_lock(&oscc->oscc_lock);
 746         oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
 747         oscc->oscc_flags |= OSCC_FLAG_EXITING;
 748         cfs_spin_unlock(&oscc->oscc_lock);
 749 }