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 <obd.h>
  63 #include "osc_internal.h"
  64
  65 /* XXX need AT adjust ? */
  66 #define osc_create_timeout      (obd_timeout / 2)
  67
  68 struct osc_create_async_args {
  69         struct osc_creator      *rq_oscc;
  70         struct lov_stripe_md    *rq_lsm;
  71         struct obd_info         *rq_oinfo;
  72 };
  73
  74 static int oscc_internal_create(struct osc_creator *oscc);
  75 static int handle_async_create(struct ptlrpc_request *req, int rc);
  76
  77 static int osc_interpret_create(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_last_id = body->oa.o_id;
 132                         oscc->oscc_grow_count = OST_MIN_PRECREATE;
 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 delorphan */
 149                 oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 150                 /* oscc->oscc_grow_count = OST_MIN_PRECREATE; */
 151                 spin_unlock(&oscc->oscc_lock);
 152                 break;
 153         }
 154         default: {
 155                 oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 156                 oscc->oscc_grow_count = OST_MIN_PRECREATE;
 157                 spin_unlock(&oscc->oscc_lock);
 158                 DEBUG_REQ(D_ERROR, req,
 159                           "unknown rc %d from async create: failing oscc", rc);
 160                 ptlrpc_fail_import(req->rq_import,
 161                                    lustre_msg_get_conn_cnt(req->rq_reqmsg));
 162         }
 163         }
 164
 165         CDEBUG(D_RPCTRACE, "prealloc through id "LPU64", next to use "LPU64"\n",
 166                oscc->oscc_last_id, oscc->oscc_next_id);
 167
 168         spin_lock(&oscc->oscc_lock);
 169         list_for_each_entry_safe(fake_req, pos,
 170                                  &oscc->oscc_wait_create_list, rq_list) {
 171                 if (handle_async_create(fake_req, rc)  == -EAGAIN) {
 172                         oscc_internal_create(oscc);
 173                         /* sending request should be never fail because
 174                          * osc use preallocated requests pool */
 175                         GOTO(exit_wakeup, rc);
 176                 }
 177         }
 178         spin_unlock(&oscc->oscc_lock);
 179
 180 exit_wakeup:
 181         cfs_waitq_signal(&oscc->oscc_waitq);
 182         RETURN(rc);
 183 }
 184
 185 static int oscc_internal_create(struct osc_creator *oscc)
 186 {
 187         struct ptlrpc_request *request;
 188         struct ost_body *body;
 189         __u32 size[] = { sizeof(struct ptlrpc_body), sizeof(*body) };
 190         ENTRY;
 191
 192         LASSERT_SPIN_LOCKED(&oscc->oscc_lock);
 193
 194         if(oscc->oscc_flags & OSCC_FLAG_RECOVERING) {
 195                 spin_unlock(&oscc->oscc_lock);
 196                 RETURN(0);
 197         }
 198
 199         /* we need check it before OSCC_FLAG_CREATING - because need
 200          * see lower number of precreate objects */
 201         if (oscc->oscc_grow_count < oscc->oscc_max_grow_count &&
 202             ((oscc->oscc_flags & OSCC_FLAG_LOW) == 0) &&
 203             (__s64)(oscc->oscc_last_id - oscc->oscc_next_id) <=
 204                    (oscc->oscc_grow_count / 4 + 1)) {
 205                 oscc->oscc_flags |= OSCC_FLAG_LOW;
 206                 oscc->oscc_grow_count *= 2;
 207         }
 208
 209         if (oscc->oscc_flags & OSCC_FLAG_CREATING) {
 210                 spin_unlock(&oscc->oscc_lock);
 211                 RETURN(0);
 212         }
 213
 214         if (oscc->oscc_grow_count > oscc->oscc_max_grow_count / 2)
 215                 oscc->oscc_grow_count = oscc->oscc_max_grow_count / 2;
 216
 217         oscc->oscc_flags |= OSCC_FLAG_CREATING;
 218         spin_unlock(&oscc->oscc_lock);
 219
 220         request = ptlrpc_prep_req(oscc->oscc_obd->u.cli.cl_import,
 221                                   LUSTRE_OST_VERSION, OST_CREATE, 2,
 222                                   size, NULL);
 223         if (request == NULL) {
 224                 spin_lock(&oscc->oscc_lock);
 225                 oscc->oscc_flags &= ~OSCC_FLAG_CREATING;
 226                 spin_unlock(&oscc->oscc_lock);
 227                 RETURN(-ENOMEM);
 228         }
 229
 230         request->rq_request_portal = OST_CREATE_PORTAL;
 231         ptlrpc_at_set_req_timeout(request);
 232         body = lustre_msg_buf(request->rq_reqmsg, REQ_REC_OFF, sizeof(*body));
 233
 234         spin_lock(&oscc->oscc_lock);
 235         body->oa.o_id = oscc->oscc_last_id + oscc->oscc_grow_count;
 236         body->oa.o_gr = 0;
 237         body->oa.o_valid |= OBD_MD_FLID | OBD_MD_FLGROUP;
 238         request->rq_async_args.space[0] = oscc->oscc_grow_count;
 239         spin_unlock(&oscc->oscc_lock);
 240         CDEBUG(D_RPCTRACE, "prealloc through id "LPU64" (last seen "LPU64")\n",
 241                body->oa.o_id, oscc->oscc_last_id);
 242
 243         /* we should not resend create request - anyway we will have delorphan
 244          * and kill these objects */
 245         request->rq_no_delay = request->rq_no_resend = 1;
 246         ptlrpc_req_set_repsize(request, 2, size);
 247
 248         request->rq_async_args.pointer_arg[0] = oscc;
 249         request->rq_interpret_reply = osc_interpret_create;
 250         ptlrpcd_add_req(request);
 251
 252         RETURN(0);
 253 }
 254
 255 static int oscc_has_objects_nolock(struct osc_creator *oscc, int count)
 256 {
 257         return ((__s64)(oscc->oscc_last_id - oscc->oscc_next_id) >= count);
 258 }
 259
 260
 261 static int oscc_has_objects(struct osc_creator *oscc, int count)
 262 {
 263         int have_objs;
 264
 265         spin_lock(&oscc->oscc_lock);
 266         have_objs = oscc_has_objects_nolock(oscc, count);
 267         spin_unlock(&oscc->oscc_lock);
 268
 269         return have_objs;
 270 }
 271
 272 static int oscc_wait_for_objects(struct osc_creator *oscc, int count)
 273 {
 274         int have_objs;
 275         int ost_full;
 276         int osc_invalid;
 277
 278         osc_invalid = oscc->oscc_obd->u.cli.cl_import->imp_invalid;
 279
 280         spin_lock(&oscc->oscc_lock);
 281         ost_full = (oscc->oscc_flags & OSCC_FLAG_NOSPC);
 282         have_objs = oscc_has_objects_nolock(oscc, count);
 283         osc_invalid |= oscc->oscc_flags & OSCC_FLAG_EXITING;
 284
 285         if (!ost_full || !osc_invalid)
 286                 /* they release lock himself */
 287                 oscc_internal_create(oscc);
 288         else
 289                 spin_unlock(&oscc->oscc_lock);
 290
 291         return have_objs || ost_full || osc_invalid;
 292 }
 293
 294 static int oscc_precreate(struct osc_creator *oscc)
 295 {
 296         struct l_wait_info lwi;
 297         int rc = 0;
 298         ENTRY;
 299
 300         if (oscc_has_objects(oscc, oscc->oscc_grow_count / 2))
 301                 RETURN(0);
 302
 303         /* we should be not block forever - because client's create rpc can
 304          * stick in mds for long time and forbid client reconnect */
 305         lwi = LWI_TIMEOUT(cfs_timeout_cap(cfs_time_seconds(osc_create_timeout)),
 306                           NULL, NULL);
 307
 308         rc = l_wait_event(oscc->oscc_waitq, oscc_wait_for_objects(oscc, 1), &lwi);
 309
 310         if (!oscc_has_objects(oscc, 1) || (oscc->oscc_flags & OSCC_FLAG_NOSPC))
 311                 rc = -ENOSPC;
 312
 313         if (oscc->oscc_obd->u.cli.cl_import->imp_invalid)
 314                 rc = -EIO;
 315
 316         RETURN(rc);
 317 }
 318
 319 static int oscc_recovering(struct osc_creator *oscc)
 320 {
 321         int recov;
 322
 323         spin_lock(&oscc->oscc_lock);
 324         recov = oscc->oscc_flags & OSCC_FLAG_RECOVERING;
 325         spin_unlock(&oscc->oscc_lock);
 326
 327         return recov;
 328 }
 329
 330 static int oscc_in_sync(struct osc_creator *oscc)
 331 {
 332         int sync;
 333
 334         spin_lock(&oscc->oscc_lock);
 335         sync = oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS;
 336         spin_unlock(&oscc->oscc_lock);
 337
 338         return sync;
 339 }
 340
 341 /* decide if the OST has remaining object, return value :
 342         0 : the OST has remaining object, and don't need to do precreate.
 343         1 : the OST has no remaining object, and will send a RPC for precreate.
 344         2 : the OST has no remaining object, and will not get any for
 345             a potentially very long time
 346      1000 : unusable
 347  */
 348 int osc_precreate(struct obd_export *exp)
 349 {
 350         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 351         struct obd_import *imp = exp->exp_imp_reverse;
 352         ENTRY;
 353
 354         LASSERT(oscc != NULL);
 355         if (imp != NULL && imp->imp_deactive)
 356                 RETURN(1000);
 357
 358         /* until oscc in recovery - other flags is wrong */
 359         if (oscc_recovering(oscc))
 360                 RETURN(2);
 361
 362         if (oscc->oscc_flags & OSCC_FLAG_NOSPC)
 363                 RETURN(1000);
 364
 365         if (oscc_has_objects(oscc, oscc->oscc_grow_count / 2))
 366                 RETURN(0);
 367
 368         spin_lock(&oscc->oscc_lock);
 369         if ((oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS) ||
 370             (oscc->oscc_flags & OSCC_FLAG_CREATING)) {
 371                 spin_unlock(&oscc->oscc_lock);
 372                 RETURN(1);
 373         }
 374
 375         oscc_internal_create(oscc);
 376         RETURN(1);
 377 }
 378
 379 static int handle_async_create(struct ptlrpc_request *req, int rc)
 380 {
 381         struct osc_create_async_args *args = ptlrpc_req_async_args(req);
 382         struct osc_creator    *oscc = args->rq_oscc;
 383         struct lov_stripe_md  *lsm  = args->rq_lsm;
 384         struct obd_info       *oinfo = args->rq_oinfo;
 385         struct obdo           *oa = oinfo->oi_oa;
 386
 387         LASSERT_SPIN_LOCKED(&oscc->oscc_lock);
 388
 389         if(rc)
 390                 GOTO(out_wake, rc);
 391
 392         if ((oscc->oscc_flags & OSCC_FLAG_EXITING))
 393                 GOTO(out_wake, rc = -EIO);
 394
 395         if (oscc_has_objects_nolock(oscc, 1)) {
 396                 memcpy(oa, &oscc->oscc_oa, sizeof(*oa));
 397                 oa->o_id = oscc->oscc_next_id;
 398                 lsm->lsm_object_id = oscc->oscc_next_id;
 399                 oscc->oscc_next_id++;
 400
 401                 CDEBUG(D_RPCTRACE, " set oscc_next_id = "LPU64"\n",
 402                        oscc->oscc_next_id);
 403                GOTO(out_wake, rc = 0);
 404         }
 405
 406         /* should be try wait until recovery finished */
 407         if(oscc->oscc_flags & OSCC_FLAG_RECOVERING)
 408                 RETURN(-EAGAIN);
 409
 410         if (oscc->oscc_flags & OSCC_FLAG_NOSPC)
 411                 GOTO(out_wake, rc = -ENOSPC);
 412
 413         /* we not have objects now - continue wait */
 414         RETURN(-EAGAIN);
 415
 416 out_wake:
 417
 418         rc = oinfo->oi_cb_up(oinfo, rc);
 419         ptlrpc_fakereq_finished(req);
 420
 421         RETURN(rc);
 422 }
 423
 424 static int async_create_interpret(struct ptlrpc_request *req, void *data, int rc)
 425 {
 426         struct osc_create_async_args *args = ptlrpc_req_async_args(req);
 427         struct osc_creator    *oscc = args->rq_oscc;
 428         int ret;
 429
 430         spin_lock(&oscc->oscc_lock);
 431         ret = handle_async_create(req, rc);
 432         spin_unlock(&oscc->oscc_lock);
 433
 434         return ret;
 435 }
 436
 437 int osc_create_async(struct obd_export *exp, struct obd_info *oinfo,
 438                      struct lov_stripe_md **ea, struct obd_trans_info *oti)
 439 {
 440         int rc;
 441         struct ptlrpc_request *fake_req;
 442         struct osc_create_async_args *args;
 443         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 444         struct obdo *oa = oinfo->oi_oa;
 445         ENTRY;
 446
 447         if ((oa->o_valid & OBD_MD_FLGROUP) && (oa->o_gr != 0)){
 448                 rc = osc_real_create(exp, oinfo->oi_oa, ea, oti);
 449                 rc = oinfo->oi_cb_up(oinfo, rc);
 450                 RETURN(rc);
 451         }
 452
 453         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 454             oa->o_flags == OBD_FL_RECREATE_OBJS) {
 455                 rc = osc_real_create(exp, oinfo->oi_oa, ea, oti);
 456                 rc = oinfo->oi_cb_up(oinfo, rc);
 457                 RETURN(rc);
 458         }
 459
 460         LASSERT((*ea) != NULL);
 461
 462         fake_req = ptlrpc_prep_fakereq(osc_create_timeout, async_create_interpret);
 463         if (fake_req == NULL) {
 464                 rc = oinfo->oi_cb_up(oinfo, -ENOMEM);
 465                 RETURN(-ENOMEM);
 466         }
 467
 468         args = ptlrpc_req_async_args(fake_req);
 469         CLASSERT(sizeof(*args) <= sizeof(fake_req->rq_async_args));
 470
 471         args->rq_oscc  = oscc;
 472         args->rq_lsm   = *ea;
 473         args->rq_oinfo = oinfo;
 474
 475         spin_lock(&oscc->oscc_lock);
 476         /* try fast path */
 477         rc = handle_async_create(fake_req, 0);
 478         if (rc == -EAGAIN) {
 479                 int is_add;
 480                 /* we not have objects - try wait */
 481                 is_add = ptlrpcd_add_req(fake_req);
 482                 if (!is_add)
 483                         list_add(&fake_req->rq_list,
 484                                  &oscc->oscc_wait_create_list);
 485                 else
 486                         rc = is_add;
 487         }
 488         spin_unlock(&oscc->oscc_lock);
 489
 490         if (rc != -EAGAIN)
 491                 /* need free request if was error hit or
 492                  * objects already allocated */
 493                 ptlrpc_req_finished(fake_req);
 494         else
 495                 /* EAGAIN mean - request is delayed */
 496                 rc = 0;
 497
 498         RETURN(rc);
 499 }
 500
 501
 502 int osc_create(struct obd_export *exp, struct obdo *oa,
 503                struct lov_stripe_md **ea, struct obd_trans_info *oti)
 504 {
 505         struct lov_stripe_md *lsm;
 506         struct osc_creator *oscc = &exp->exp_obd->u.cli.cl_oscc;
 507         int rc = 0;
 508
 509         ENTRY;
 510         LASSERT(oa);
 511         LASSERT(ea);
 512
 513         if ((oa->o_valid & OBD_MD_FLGROUP) && (oa->o_gr != 0))
 514                 RETURN(osc_real_create(exp, oa, ea, oti));
 515
 516         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 517             oa->o_flags == OBD_FL_RECREATE_OBJS) {
 518                 RETURN(osc_real_create(exp, oa, ea, oti));
 519         }
 520
 521         /* this is the special case where create removes orphans */
 522         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
 523             oa->o_flags == OBD_FL_DELORPHAN) {
 524                 spin_lock(&oscc->oscc_lock);
 525                 if (oscc->oscc_flags & OSCC_FLAG_SYNC_IN_PROGRESS) {
 526                         spin_unlock(&oscc->oscc_lock);
 527                         RETURN(-EBUSY);
 528                 }
 529                 if (!(oscc->oscc_flags & OSCC_FLAG_RECOVERING)) {
 530                         spin_unlock(&oscc->oscc_lock);
 531                         RETURN(0);
 532                 }
 533
 534                 oscc->oscc_flags |= OSCC_FLAG_SYNC_IN_PROGRESS;
 535                 /* seting flag LOW we prevent extra grow precreate size
 536                  * and enforce use last assigned size */
 537                 oscc->oscc_flags |= OSCC_FLAG_LOW;
 538                 spin_unlock(&oscc->oscc_lock);
 539                 CDEBUG(D_HA, "%s: oscc recovery started - delete to "LPU64"\n",
 540                        oscc->oscc_obd->obd_name, oscc->oscc_next_id - 1);
 541
 542                 /* delete from next_id on up */
 543                 oa->o_valid |= OBD_MD_FLID | OBD_MD_FLGROUP;
 544                 oa->o_id = oscc->oscc_next_id - 1;
 545                 oa->o_gr = 0;
 546
 547                 rc = osc_real_create(exp, oa, ea, NULL);
 548
 549                 spin_lock(&oscc->oscc_lock);
 550                 oscc->oscc_flags &= ~OSCC_FLAG_SYNC_IN_PROGRESS;
 551                 if (rc == 0 || rc == -ENOSPC) {
 552                         struct obd_connect_data *ocd;
 553                         struct obd_import *imp = oscc->oscc_obd->u.cli.cl_import;
 554
 555                         if (rc == -ENOSPC)
 556                                 oscc->oscc_flags |= OSCC_FLAG_NOSPC;
 557                         oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
 558                         oscc->oscc_last_id = oa->o_id;
 559
 560                         ocd = &imp->imp_connect_data;
 561                         if (ocd->ocd_connect_flags & OBD_CONNECT_SKIP_ORPHAN) {
 562                                 CDEBUG(D_HA, "%s: Skip orphan set, reset last "
 563                                        "objid\n", oscc->oscc_obd->obd_name);
 564                                 oscc->oscc_next_id = oa->o_id + 1;
 565                         }
 566
 567                         CDEBUG(D_HA, "%s: oscc recovery finished, last_id: "
 568                                LPU64", rc: %d\n", oscc->oscc_obd->obd_name,
 569                                oscc->oscc_last_id, rc);
 570                 } else {
 571                         CDEBUG(D_ERROR, "%s: oscc recovery failed: %d\n",
 572                                oscc->oscc_obd->obd_name, rc);
 573                 }
 574
 575                 cfs_waitq_signal(&oscc->oscc_waitq);
 576                 spin_unlock(&oscc->oscc_lock);
 577
 578                 if (rc < 0)
 579                         RETURN(rc);
 580         }
 581
 582         lsm = *ea;
 583         if (lsm == NULL) {
 584                 rc = obd_alloc_memmd(exp, &lsm);
 585                 if (rc < 0)
 586                         RETURN(rc);
 587         }
 588
 589         while (1) {
 590                 if (oscc_in_sync(oscc))
 591                         CDEBUG(D_HA,"%s: oscc recovery in progress, waiting\n",
 592                                oscc->oscc_obd->obd_name);
 593
 594                 rc = oscc_precreate(oscc);
 595                 if (rc) {
 596                         CDEBUG(D_HA,"%s: error create %d\n",
 597                                oscc->oscc_obd->obd_name, rc);
 598                         break;
 599                 }
 600
 601                 spin_lock(&oscc->oscc_lock);
 602                 if (oscc->oscc_flags & OSCC_FLAG_EXITING) {
 603                         spin_unlock(&oscc->oscc_lock);
 604                         break;
 605                 }
 606                 /* wakeup but recovery not finished */
 607                 if (oscc->oscc_flags & OSCC_FLAG_RECOVERING) {
 608                         rc = -EIO;
 609                         spin_unlock(&oscc->oscc_lock);
 610                         break;
 611                 }
 612
 613                 if (oscc_has_objects_nolock(oscc, 1)) {
 614                         memcpy(oa, &oscc->oscc_oa, sizeof(*oa));
 615                         oa->o_id = oscc->oscc_next_id;
 616                         lsm->lsm_object_id = oscc->oscc_next_id;
 617                         *ea = lsm;
 618                         oscc->oscc_next_id++;
 619                         spin_unlock(&oscc->oscc_lock);
 620
 621                         CDEBUG(D_RPCTRACE, "%s: set oscc_next_id = "LPU64"\n",
 622                                exp->exp_obd->obd_name, oscc->oscc_next_id);
 623                         break;
 624                 } else if (oscc->oscc_flags & OSCC_FLAG_NOSPC) {
 625                         rc = -ENOSPC;
 626                         spin_unlock(&oscc->oscc_lock);
 627                         break;
 628                 }
 629
 630                 spin_unlock(&oscc->oscc_lock);
 631         }
 632
 633         if (rc == 0)
 634                 CDEBUG(D_INFO, "%s: returning objid "LPU64"\n",
 635                        obd2cli_tgt(oscc->oscc_obd), lsm->lsm_object_id);
 636         else if (*ea == NULL)
 637                 obd_free_memmd(exp, &lsm);
 638         RETURN(rc);
 639 }
 640
 641 void oscc_init(struct obd_device *obd)
 642 {
 643         struct osc_creator *oscc;
 644
 645         if (obd == NULL)
 646                 return;
 647
 648         oscc = &obd->u.cli.cl_oscc;
 649
 650         memset(oscc, 0, sizeof(*oscc));
 651
 652         cfs_waitq_init(&oscc->oscc_waitq);
 653         spin_lock_init(&oscc->oscc_lock);
 654         oscc->oscc_obd = obd;
 655         oscc->oscc_grow_count = OST_MIN_PRECREATE;
 656         oscc->oscc_max_grow_count = OST_MAX_PRECREATE;
 657
 658         oscc->oscc_next_id = 2;
 659         oscc->oscc_last_id = 1;
 660         oscc->oscc_flags |= OSCC_FLAG_RECOVERING;
 661
 662         CFS_INIT_LIST_HEAD(&oscc->oscc_wait_create_list);
 663
 664         /* XXX the export handle should give the oscc the last object */
 665         /* oed->oed_oscc.oscc_last_id = exph->....; */
 666 }
 667
 668 void oscc_fini(struct obd_device *obd)
 669 {
 670         struct osc_creator *oscc = &obd->u.cli.cl_oscc;
 671         ENTRY;
 672
 673
 674         spin_lock(&oscc->oscc_lock);
 675         oscc->oscc_flags &= ~OSCC_FLAG_RECOVERING;
 676         oscc->oscc_flags |= OSCC_FLAG_EXITING;
 677         spin_unlock(&oscc->oscc_lock);
 678 }