lustre/osc/osc_create.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  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 #ifndef EXPORT_SYMTAB
  46 # define EXPORT_SYMTAB
  47 #endif
  48 #define DEBUG_SUBSYSTEM S_OSC
  49
  50 #ifdef __KERNEL__
  51 # include <libcfs/libcfs.h>
  52 #else /* __KERNEL__ */
  53 # include <liblustre.h>
  54 #endif
  55
  56 #ifdef  __CYGWIN__
  57 # include <ctype.h>
  58 #endif
  59
  60 #include <lustre_dlm.h>
  61 #include <obd_class.h>
  62 #include "osc_internal.h"
  63
  64 /* XXX need AT adjust ? */
  65 #define osc_create_timeout      (obd_timeout / 2)
  66
  67 struct osc_create_async_args {
  68         struct osc_creator      *rq_oscc;
  69         struct lov_stripe_md    *rq_lsm;
  70         struct obd_info         *rq_oinfo;
  71 };
  72
  73 static int oscc_internal_create(struct osc_creator *oscc);
  74 static int handle_async_create(struct ptlrpc_request *req, int rc);
  75
  76 static int osc_interpret_create(const struct lu_env *env,
  77                                 struct ptlrpc_request *req, void *data, int rc)
  78 {
  79         struct osc_creator *oscc;
  80         struct ost_body *body = NULL;
  81         struct ptlrpc_request *fake_req, *pos;
  82         ENTRY;
  83
  84         if (req->rq_repmsg) {
  85                 body = lustre_swab_repbuf(req, REPLY_REC_OFF, sizeof(*body),
  86                                           lustre_swab_ost_body);
  87                 if (body == NULL && rc == 0)
  88                         rc = -EPROTO;
  89         }
  90
  91         oscc = req->rq_async_args.pointer_arg[0];
  92         LASSERT(oscc && (oscc->oscc_obd != LP_POISON));
  93
  94         spin_lock(&oscc->oscc_lock);
  95         oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
  96         switch (rc) {
  97         case 0: {
  98                 if (body) {
  99                         int diff = body->oa.o_id - oscc->oscc_last_id;
 100
 101                         /* oscc_internal_create() stores the original value of
 102                          * grow_count in rq_async_args.space[0].
 103                          * We can't compare against oscc_grow_count directly,
 104                          * because it may have been increased while the RPC
 105                          * is in flight, so we would always find ourselves
 106                          * having created fewer objects and decreasing the
 107                          * precreate request size.  b=18577 */
 108                         if (diff < (int) req->rq_async_args.space[0]) {
 109                                 /* the OST has not managed to create all the
 110                                  * objects we asked for */
 111                                 oscc->oscc_grow_count = max(diff,
 112                                                             OST_MIN_PRECREATE);
 113                                 /* don't bump grow_count next time */
 114                                 oscc->oscc_flags |= OSCC_FLAG_LOW;
 115                         } else {
 116                                 /* the OST is able to keep up with the work,
 117                                  * we could consider increasing grow_count
 118                                  * next time if needed */
 119                                 oscc->oscc_flags &= ~OSCC_FLAG_LOW;
 120                         }
 121                         oscc->oscc_last_id = body->oa.o_id;
 122                 }
 123                 spin_unlock(&oscc->oscc_lock);
 124                 break;
 125         }
 126         case -ENOSPC:
 127         case -EROFS:
 128         case -EFBIG: {
 129                 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
 130                 if (body && rc == -ENOSPC) {
 131                         oscc->oscc_grow_count = OST_MIN_PRECREATE;
 132                         oscc->oscc_last_id = body->oa.o_id;
 133                 }
 134                 spin_unlock(&oscc->oscc_lock);
 135                 DEBUG_REQ(D_INODE, req, "OST out of space, flagging");
 136                 break;
 137         }
 138         case -EIO: {
 139                 /* filter always set body->oa.o_id as the last_id
 140                  * of filter (see filter_handle_precreate for detail)*/
 141                 if (body && body->oa.o_id > oscc->oscc_last_id)
 142                         oscc->oscc_last_id = body->oa.o_id;
 143                 spin_unlock(&oscc->oscc_lock);
 144                 break;
 145         }
 146         case -EWOULDBLOCK: {
 147                 /* aka EAGAIN we should not delay create if import failed -
 148                  * this avoid client stick in create and avoid race with
 149                  * delorphan */
 150                 oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 151                 /* oscc->oscc_grow_count = OST_MIN_PRECREATE; */
 152                 spin_unlock(&oscc->oscc_lock);
 153                 break;
 154         }
 155         default: {
 156                 oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 157                 oscc->oscc_grow_count = OST_MIN_PRECREATE;
 158                 spin_unlock(&oscc->oscc_lock);
 159                 DEBUG_REQ(D_ERROR, req,
 160                           "Unknown rc %d from async create: failing oscc", rc);
 161                 ptlrpc_fail_import(req->rq_import,
 162                                    lustre_msg_get_conn_cnt(req->rq_reqmsg));
 163         }
 164         }
 165
 166         CDEBUG(D_HA, "preallocated through id "LPU64" (next to use "LPU64")\n",
 167                oscc->oscc_last_id, oscc->oscc_next_id);
 168
 169         spin_lock(&oscc->oscc_lock);
 170         list_for_each_entry_safe(fake_req, pos,
 171                                  &oscc->oscc_wait_create_list, rq_list) {
 172                 if (handle_async_create(fake_req, rc)  == -EAGAIN) {
 173                         oscc_internal_create(oscc);
 174                         /* sending request should be never fail because
 175                          * osc use preallocated requests pool */
 176                         GOTO(exit_wakeup, rc);
 177                 }
 178         }
 179         spin_unlock(&oscc->oscc_lock);
 180
 181 exit_wakeup:
 182         cfs_waitq_signal(&oscc->oscc_waitq);
 183         RETURN(rc);
 184 }
 185
 186 static int oscc_internal_create(struct osc_creator *oscc)
 187 {
 188         struct ptlrpc_request *request;
 189         struct ost_body *body;
 190         __u32 size[] = { sizeof(struct ptlrpc_body), sizeof(*body) };
 191         ENTRY;
 192
 193         LASSERT_SPIN_LOCKED(&oscc->oscc_lock);
 194
 195         if(oscc->oscc_flags & OSCC_FLAG_RECOVERING) {
 196                 spin_unlock(&oscc->oscc_lock);
 197                 RETURN(0);
 198         }
 199
 200         /* we need check it before OSCC_FLAG_CREATING - because need
 201          * see lower number of precreate objects */
 202         if (oscc->oscc_grow_count < oscc->oscc_max_grow_count &&
 203             ((oscc->oscc_flags & OSCC_FLAG_LOW) == 0) &&
 204             (__s64)(oscc->oscc_last_id - oscc->oscc_next_id) <=
 205                    (oscc->oscc_grow_count / 4 + 1)) {
 206                 oscc->oscc_flags |= OSCC_FLAG_LOW;
 207                 oscc->oscc_grow_count *= 2;
 208         }
 209
 210         if (oscc->oscc_flags & OSCC_FLAG_CREATING) {
 211                 spin_unlock(&oscc->oscc_lock);
 212                 RETURN(0);
 213         }
 214
 215         if (oscc->oscc_grow_count > oscc->oscc_max_grow_count / 2)
 216                 oscc->oscc_grow_count = oscc->oscc_max_grow_count / 2;
 217
 218         oscc->oscc_flags |= OSCC_FLAG_CREATING;
 219         spin_unlock(&oscc->oscc_lock);
 220
 221         request = ptlrpc_prep_req(oscc->oscc_obd->u.cli.cl_import,
 222                                   LUSTRE_OST_VERSION, OST_CREATE, 2,
 223                                   size, NULL);
 224         if (request == NULL) {
 225                 spin_lock(&oscc->oscc_lock);
 226                 oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
 227                 spin_unlock(&oscc->oscc_lock);
 228                 RETURN(-ENOMEM);
 229         }
 230
 231         request->rq_request_portal = OST_CREATE_PORTAL;
 232         ptlrpc_at_set_req_timeout(request);
 233         body = lustre_msg_buf(request->rq_reqmsg, REQ_REC_OFF, sizeof(*body));
 234
 235         spin_lock(&oscc->oscc_lock);
 236         body->oa.o_id = oscc->oscc_last_id + oscc->oscc_grow_count;
 237         body->oa.o_gr = oscc->oscc_oa.o_gr;
 238         LASSERT_MDS_GROUP(body->oa.o_gr);
 239         body->oa.o_valid |= OBD_MD_FLID | OBD_MD_FLGROUP;
 240         request->rq_async_args.space[0] = oscc->oscc_grow_count;
 241         spin_unlock(&oscc->oscc_lock);
 242         CDEBUG(D_RPCTRACE, "prealloc through id "LPU64" (last seen "LPU64")\n",
 243                body->oa.o_id, oscc->oscc_last_id);
 244
 245         /* we should not resend create request - anyway we will have delorphan
 246          * and kill these objects */
 247         request->rq_no_delay = request->rq_no_resend = 1;
 248         ptlrpc_req_set_repsize(request, 2, size);
 249
 250         request->rq_async_args.pointer_arg[0] = oscc;
 251         request->rq_interpret_reply = osc_interpret_create;
 252         ptlrpcd_add_req(request, PSCOPE_OTHER);
 253
 254         RETURN(0);
 255 }
 256
 257 static int oscc_has_objects_nolock(struct osc_creator *oscc, int count)
 258 {
 259         return ((__s64)(oscc->oscc_last_id - oscc->oscc_next_id) >= count);
 260 }
 261
 262
 263 static int oscc_has_objects(struct osc_creator *oscc, int count)
 264 {
 265         int have_objs;
 266
 267         spin_lock(&oscc->oscc_lock);
 268         have_objs = oscc_has_objects_nolock(oscc, count);
 269         spin_unlock(&oscc->oscc_lock);
 270
 271         return have_objs;
 272 }
 273
 274 static int oscc_wait_for_objects(struct osc_creator *oscc, int count)
 275 {
 276         int have_objs;
 277         int ost_full;
 278         int osc_invalid;
 279
 280         osc_invalid = oscc->oscc_obd->u.cli.cl_import->imp_invalid;
 281
 282         spin_lock(&oscc->oscc_lock);
 283         ost_full = (oscc->oscc_flags & OSCC_FLAG_NOSPC);
 284         have_objs = oscc_has_objects_nolock(oscc, count);
 285         osc_invalid |= oscc->oscc_flags & OSCC_FLAG_EXITING;
 286
 287         if (!ost_full && !osc_invalid)
 288                 /* they release lock himself */
 289                 oscc_internal_create(oscc);
 290         else
 291                 spin_unlock(&oscc->oscc_lock);
 292
 293         return have_objs || ost_full || osc_invalid;
 294 }
 295
 296 static int oscc_precreate(struct osc_creator *oscc)
 297 {
 298         struct l_wait_info lwi;
 299         int rc = 0;
 300         ENTRY;
 301
 302         if (oscc_has_objects(oscc, oscc->oscc_grow_count / 2))
 303                 RETURN(0);
 304
 305         /* we should be not block forever - because client's create rpc can
 306          * stick in mds for long time and forbid client reconnect */
 307         lwi = LWI_TIMEOUT(cfs_timeout_cap(cfs_time_seconds(osc_create_timeout)),
 308                           NULL, NULL);
 309
 310         rc = l_wait_event(oscc->oscc_waitq, oscc_wait_for_objects(oscc, 1), &lwi);
 311
 312         if (!oscc_has_objects(oscc, 1) || (oscc->oscc_flags & OSCC_FLAG_NOSPC))
 313                 rc = -ENOSPC;
 314
 315         if (oscc->oscc_obd->u.cli.cl_import->imp_invalid)
 316                 rc = -EIO;
 317
 318         RETURN(rc);
 319 }
 320
 321 static int oscc_recovering(struct osc_creator *oscc)
 322 {
 323         int recov;
 324
 325         spin_lock(&oscc->oscc_lock);
 326         recov = oscc->oscc_flags & OSCC_FLAG_RECOVERING;
 327         spin_unlock(&oscc->oscc_lock);
 328
 329         return recov;
 330 }
 331
 332 static int oscc_in_sync(struct osc_creator *oscc)
 333 {
 334         int sync;
 335
 336         spin_lock(&oscc->oscc_lock);
 337         sync = oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS;
 338         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 object, and don't need to do precreate.
 345         1 : the OST has no remaining object, and will send a RPC for precreate.
 346         2 : the OST has no remaining object, and will not get any for
 347             a potentially very long time
 348      1000 : unusable
 349  */
 350 int osc_precreate(struct obd_export *exp)
 351 {
 352         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 353         struct obd_import *imp = exp->exp_imp_reverse;
 354         ENTRY;
 355
 356         LASSERT(oscc != NULL);
 357         if (imp != NULL && imp->imp_deactive)
 358                 RETURN(1000);
 359
 360         /* until oscc in recovery - other flags is wrong */
 361         if (oscc_recovering(oscc))
 362                 RETURN(2);
 363
 364         if (oscc->oscc_flags & OSCC_FLAG_NOSPC)
 365                 RETURN(1000);
 366
 367         if (oscc_has_objects(oscc, oscc->oscc_grow_count / 2))
 368                 RETURN(0);
 369
 370         spin_lock(&oscc->oscc_lock);
 371         if ((oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS) ||
 372             (oscc->oscc_flags & OSCC_FLAG_CREATING)) {
 373                 spin_unlock(&oscc->oscc_lock);
 374                 RETURN(1);
 375         }
 376
 377         oscc_internal_create(oscc);
 378         RETURN(1);
 379 }
 380
 381 static int handle_async_create(struct ptlrpc_request *req, int rc)
 382 {
 383         struct osc_create_async_args *args = ptlrpc_req_async_args(req);
 384         struct osc_creator    *oscc = args->rq_oscc;
 385         struct lov_stripe_md  *lsm  = args->rq_lsm;
 386         struct obd_info       *oinfo = args->rq_oinfo;
 387         struct obdo           *oa = oinfo->oi_oa;
 388
 389         LASSERT_SPIN_LOCKED(&oscc->oscc_lock);
 390
 391         if(rc)
 392                 GOTO(out_wake, rc);
 393
 394         if ((oscc->oscc_flags & OSCC_FLAG_EXITING))
 395                 GOTO(out_wake, rc = -EIO);
 396
 397         if (oscc_has_objects_nolock(oscc, 1)) {
 398                 memcpy(oa, &oscc->oscc_oa, sizeof(*oa));
 399                 oa->o_id = oscc->oscc_next_id;
 400                 lsm->lsm_object_id = oscc->oscc_next_id;
 401                 oscc->oscc_next_id++;
 402
 403                 CDEBUG(D_RPCTRACE, " set oscc_next_id = "LPU64"\n",
 404                        oscc->oscc_next_id);
 405                GOTO(out_wake, rc = 0);
 406         }
 407
 408         /* should be try wait until recovery finished */
 409         if(oscc->oscc_flags & OSCC_FLAG_RECOVERING)
 410                 RETURN(-EAGAIN);
 411
 412         if (oscc->oscc_flags & OSCC_FLAG_NOSPC)
 413                 GOTO(out_wake, rc = -ENOSPC);
 414
 415         /* we not have objects now - continue wait */
 416         RETURN(-EAGAIN);
 417
 418 out_wake:
 419
 420         rc = oinfo->oi_cb_up(oinfo, rc);
 421         ptlrpc_fakereq_finished(req);
 422
 423         RETURN(rc);
 424 }
 425
 426 static int async_create_interpret(const struct lu_env *env,
 427                                   struct ptlrpc_request *req, void *data, int rc)
 428 {
 429         struct osc_create_async_args *args = ptlrpc_req_async_args(req);
 430         struct osc_creator    *oscc = args->rq_oscc;
 431         int ret;
 432
 433         spin_lock(&oscc->oscc_lock);
 434         ret = handle_async_create(req, rc);
 435         spin_unlock(&oscc->oscc_lock);
 436
 437         return ret;
 438 }
 439
 440 int osc_create_async(struct obd_export *exp, struct obd_info *oinfo,
 441                      struct lov_stripe_md **ea, struct obd_trans_info *oti)
 442 {
 443         int rc;
 444         struct ptlrpc_request *fake_req;
 445         struct osc_create_async_args *args;
 446         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 447         struct obdo *oa = oinfo->oi_oa;
 448         ENTRY;
 449
 450         if ((oa->o_valid & OBD_MD_FLGROUP) && (oa->o_gr != 0)){
 451                 rc = osc_real_create(exp, oinfo->oi_oa, ea, oti);
 452                 rc = oinfo->oi_cb_up(oinfo, rc);
 453                 RETURN(rc);
 454         }
 455
 456         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 457             oa->o_flags == OBD_FL_RECREATE_OBJS) {
 458                 rc = osc_real_create(exp, oinfo->oi_oa, ea, oti);
 459                 rc = oinfo->oi_cb_up(oinfo, rc);
 460                 RETURN(rc);
 461         }
 462
 463         LASSERT((*ea) != NULL);
 464
 465         fake_req = ptlrpc_prep_fakereq(oscc->oscc_obd->u.cli.cl_import,
 466                                        osc_create_timeout,
 467                                        async_create_interpret);
 468         if (fake_req == NULL) {
 469                 rc = oinfo->oi_cb_up(oinfo, -ENOMEM);
 470                 RETURN(-ENOMEM);
 471         }
 472
 473         args = ptlrpc_req_async_args(fake_req);
 474         CLASSERT(sizeof(*args) <= sizeof(fake_req->rq_async_args));
 475
 476         args->rq_oscc  = oscc;
 477         args->rq_lsm   = *ea;
 478         args->rq_oinfo = oinfo;
 479
 480         spin_lock(&oscc->oscc_lock);
 481         /* try fast path */
 482         rc = handle_async_create(fake_req, 0);
 483         if (rc == -EAGAIN) {
 484                 int is_add;
 485                 /* we not have objects - try wait */
 486                 is_add = ptlrpcd_add_req(fake_req, PSCOPE_OTHER);
 487                 if (!is_add)
 488                         list_add(&fake_req->rq_list,
 489                                  &oscc->oscc_wait_create_list);
 490                 else
 491                         rc = is_add;
 492         }
 493         spin_unlock(&oscc->oscc_lock);
 494
 495         if (rc != -EAGAIN)
 496                 /* need free request if was error hit or
 497                  * objects already allocated */
 498                 ptlrpc_req_finished(fake_req);
 499         else
 500                 /* EAGAIN mean - request is delayed */
 501                 rc = 0;
 502
 503         RETURN(rc);
 504 }
 505
 506 int osc_create(struct obd_export *exp, struct obdo *oa,
 507                struct lov_stripe_md **ea, struct obd_trans_info *oti)
 508 {
 509         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 510         struct obd_import  *imp  = exp->exp_obd->u.cli.cl_import;
 511         struct lov_stripe_md *lsm;
 512         int rc = 0;
 513         ENTRY;
 514
 515         LASSERT(oa);
 516         LASSERT(ea);
 517         LASSERT_MDS_GROUP(oa->o_gr);
 518         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
 519
 520         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 521             oa->o_flags == OBD_FL_RECREATE_OBJS) {
 522                 RETURN(osc_real_create(exp, oa, ea, oti));
 523         }
 524
 525         if (oa->o_gr == FILTER_GROUP_LLOG || oa->o_gr == FILTER_GROUP_ECHO)
 526                 RETURN(osc_real_create(exp, oa, ea, oti));
 527
 528         /* this is the special case where create removes orphans */
 529         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 530             oa->o_flags == OBD_FL_DELORPHAN) {
 531                 spin_lock(&oscc->oscc_lock);
 532                 if (oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS) {
 533                         spin_unlock(&oscc->oscc_lock);
 534                         RETURN(-EBUSY);
 535                 }
 536                 if (!(oscc->oscc_flags & OSCC_FLAG_RECOVERING)) {
 537                         spin_unlock(&oscc->oscc_lock);
 538                         RETURN(0);
 539                 }
 540
 541                 oscc->oscc_flags |= OSCC_FLAG_SYNC_IN_PROGRESS;
 542                 /* seting flag LOW we prevent extra grow precreate size
 543                  * and enforce use last assigned size */
 544                 oscc->oscc_flags |= OSCC_FLAG_LOW;
 545                 spin_unlock(&oscc->oscc_lock);
 546                 CDEBUG(D_HA, "%s: oscc recovery started - delete to "LPU64"\n",
 547                        oscc->oscc_obd->obd_name, oscc->oscc_next_id - 1);
 548
 549                 /* delete from next_id on up */
 550                 oa->o_valid |= OBD_MD_FLID;
 551                 oa->o_id = oscc->oscc_next_id - 1;
 552
 553                 rc = osc_real_create(exp, oa, ea, NULL);
 554
 555                 spin_lock(&oscc->oscc_lock);
 556                 oscc->oscc_flags &= ~OSCC_FLAG_SYNC_IN_PROGRESS;
 557                 if (rc == 0 || rc == -ENOSPC) {
 558                         struct obd_connect_data *ocd;
 559
 560                         if (rc == -ENOSPC)
 561                                 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
 562                         oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
 563
 564                         oscc->oscc_last_id = oa->o_id;
 565                         ocd = &imp->imp_connect_data;
 566                         if (ocd->ocd_connect_flags & OBD_CONNECT_SKIP_ORPHAN) {
 567                                 CDEBUG(D_HA, "%s: Skip orphan set, reset last "
 568                                        "objid\n", oscc->oscc_obd->obd_name);
 569                                 oscc->oscc_next_id = oa->o_id + 1;
 570                         }
 571
 572                         /* sanity check for next objid. see bug 17025 */
 573                         LASSERT(oscc->oscc_next_id == oa->o_id + 1);
 574
 575                         CDEBUG(D_HA, "%s: oscc recovery finished, last_id: "
 576                                LPU64", rc: %d\n", oscc->oscc_obd->obd_name,
 577                                oscc->oscc_last_id, rc);
 578                 } else {
 579                         CDEBUG(D_ERROR, "%s: oscc recovery failed: %d\n",
 580                                oscc->oscc_obd->obd_name, rc);
 581                 }
 582
 583                 cfs_waitq_signal(&oscc->oscc_waitq);
 584                 spin_unlock(&oscc->oscc_lock);
 585
 586                 if (rc < 0)
 587                         RETURN(rc);
 588         }
 589
 590         lsm = *ea;
 591         if (lsm == NULL) {
 592                 rc = obd_alloc_memmd(exp, &lsm);
 593                 if (rc < 0)
 594                         RETURN(rc);
 595         }
 596
 597         while (1) {
 598                 if (oscc_in_sync(oscc))
 599                         CDEBUG(D_HA,"%s: oscc recovery in progress, waiting\n",
 600                                oscc->oscc_obd->obd_name);
 601
 602                 rc = oscc_precreate(oscc);
 603                 if (rc) {
 604                         CDEBUG(D_HA,"%s: error create %d\n",
 605                                oscc->oscc_obd->obd_name, rc);
 606                         break;
 607                 }
 608
 609                 spin_lock(&oscc->oscc_lock);
 610                 if (oscc->oscc_flags & OSCC_FLAG_EXITING) {
 611                         spin_unlock(&oscc->oscc_lock);
 612                         break;
 613                 }
 614                 /* wakeup but recovery not finished */
 615                 if (oscc->oscc_flags & OSCC_FLAG_RECOVERING) {
 616                         rc = -EIO;
 617                         spin_unlock(&oscc->oscc_lock);
 618                         break;
 619                 }
 620
 621                 if (oscc_has_objects_nolock(oscc, 1)) {
 622                         memcpy(oa, &oscc->oscc_oa, sizeof(*oa));
 623                         oa->o_id = oscc->oscc_next_id;
 624                         lsm->lsm_object_id = oscc->oscc_next_id;
 625                         *ea = lsm;
 626                         oscc->oscc_next_id++;
 627                         spin_unlock(&oscc->oscc_lock);
 628
 629                         CDEBUG(D_RPCTRACE, "%s: set oscc_next_id = "LPU64"\n",
 630                                exp->exp_obd->obd_name, oscc->oscc_next_id);
 631                         break;
 632                 } else if (oscc->oscc_flags & OSCC_FLAG_NOSPC) {
 633                         rc = -ENOSPC;
 634                         spin_unlock(&oscc->oscc_lock);
 635                         break;
 636                 }
 637
 638                 spin_unlock(&oscc->oscc_lock);
 639         }
 640
 641         if (rc == 0)
 642                 CDEBUG(D_INFO, "%s: returning objid "LPU64"\n",
 643                        obd2cli_tgt(oscc->oscc_obd), lsm->lsm_object_id);
 644         else if (*ea == NULL)
 645                 obd_free_memmd(exp, &lsm);
 646         RETURN(rc);
 647 }
 648
 649 void oscc_init(struct obd_device *obd)
 650 {
 651         struct osc_creator *oscc;
 652
 653         if (obd == NULL)
 654                 return;
 655
 656         oscc = &obd->u.cli.cl_oscc;
 657
 658         memset(oscc, 0, sizeof(*oscc));
 659
 660         cfs_waitq_init(&oscc->oscc_waitq);
 661         spin_lock_init(&oscc->oscc_lock);
 662         oscc->oscc_obd = obd;
 663         oscc->oscc_grow_count = OST_MIN_PRECREATE;
 664         oscc->oscc_max_grow_count = OST_MAX_PRECREATE;
 665
 666         oscc->oscc_next_id = 2;
 667         oscc->oscc_last_id = 1;
 668         oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 669
 670         CFS_INIT_LIST_HEAD(&oscc->oscc_wait_create_list);
 671
 672         /* XXX the export handle should give the oscc the last object */
 673         /* oed->oed_oscc.oscc_last_id = exph->....; */
 674 }
 675
 676 void oscc_fini(struct obd_device *obd)
 677 {
 678         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
 679         ENTRY;
 680
 681
 682         spin_lock(&oscc->oscc_lock);
 683         oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
 684         oscc->oscc_flags |= OSCC_FLAG_EXITING;
 685         spin_unlock(&oscc->oscc_lock);
 686 }