lustre/osp/osp_dev.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/osp/osp_dev.c
  37  *
  38  * Lustre OST Proxy Device
  39  *
  40  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
  41  * Author: Mikhail Pershin <mike.pershin@intel.com>
  42  * Author: Di Wang <di.wang@intel.com>
  43  */
  44
  45 #define DEBUG_SUBSYSTEM S_MDS
  46
  47 #include <obd_class.h>
  48 #include <lustre_ioctl.h>
  49 #include <lustre_param.h>
  50 #include <lustre_log.h>
  51 #include <lustre_mdc.h>
  52
  53 #include "osp_internal.h"
  54
  55 /* Slab for OSP object allocation */
  56 struct kmem_cache *osp_object_kmem;
  57
  58 static struct lu_kmem_descr osp_caches[] = {
  59         {
  60                 .ckd_cache = &osp_object_kmem,
  61                 .ckd_name  = "osp_obj",
  62                 .ckd_size  = sizeof(struct osp_object)
  63         },
  64         {
  65                 .ckd_cache = NULL
  66         }
  67 };
  68
  69 struct lu_object *osp_object_alloc(const struct lu_env *env,
  70                                    const struct lu_object_header *hdr,
  71                                    struct lu_device *d)
  72 {
  73         struct lu_object_header *h = NULL;
  74         struct osp_object       *o;
  75         struct lu_object        *l;
  76
  77         OBD_SLAB_ALLOC_PTR_GFP(o, osp_object_kmem, GFP_NOFS);
  78         if (o != NULL) {
  79                 l = &o->opo_obj.do_lu;
  80
  81                 /* If hdr is NULL, it means the object is not built
  82                  * from the top dev(MDT/OST), usually it happens when
  83                  * building striped object, like data object on MDT or
  84                  * striped object for directory */
  85                 if (hdr == NULL) {
  86                         h = &o->opo_header;
  87                         lu_object_header_init(h);
  88                         dt_object_init(&o->opo_obj, h, d);
  89                         lu_object_add_top(h, l);
  90                 } else {
  91                         dt_object_init(&o->opo_obj, h, d);
  92                 }
  93
  94                 l->lo_ops = &osp_lu_obj_ops;
  95
  96                 return l;
  97         } else {
  98                 return NULL;
  99         }
 100 }
 101
 102 static struct dt_object
 103 *osp_find_or_create(const struct lu_env *env, struct osp_device *osp,
 104                     struct lu_attr *attr, __u32 reg_id)
 105 {
 106         struct osp_thread_info *osi = osp_env_info(env);
 107         struct dt_object_format dof = { 0 };
 108         struct dt_object       *dto;
 109         int                  rc;
 110         ENTRY;
 111
 112         lu_local_obj_fid(&osi->osi_fid, reg_id);
 113         attr->la_valid = LA_MODE;
 114         attr->la_mode = S_IFREG | 0644;
 115         dof.dof_type = DFT_REGULAR;
 116         dto = dt_find_or_create(env, osp->opd_storage, &osi->osi_fid,
 117                                 &dof, attr);
 118         if (IS_ERR(dto))
 119                 RETURN(dto);
 120
 121         rc = dt_attr_get(env, dto, attr, NULL);
 122         if (rc) {
 123                 CERROR("%s: can't be initialized: rc = %d\n",
 124                        osp->opd_obd->obd_name, rc);
 125                 lu_object_put(env, &dto->do_lu);
 126                 RETURN(ERR_PTR(rc));
 127         }
 128         RETURN(dto);
 129 }
 130
 131 static int osp_write_local_file(const struct lu_env *env,
 132                                 struct osp_device *osp,
 133                                 struct dt_object *dt_obj,
 134                                 struct lu_buf *buf,
 135                                 loff_t offset)
 136 {
 137         struct thandle *th;
 138         int rc;
 139
 140         th = dt_trans_create(env, osp->opd_storage);
 141         if (IS_ERR(th))
 142                 RETURN(PTR_ERR(th));
 143
 144         rc = dt_declare_record_write(env, dt_obj, buf, offset, th);
 145         if (rc)
 146                 GOTO(out, rc);
 147         rc = dt_trans_start_local(env, osp->opd_storage, th);
 148         if (rc)
 149                 GOTO(out, rc);
 150
 151         rc = dt_record_write(env, dt_obj, buf, &offset, th);
 152 out:
 153         dt_trans_stop(env, osp->opd_storage, th);
 154         RETURN(rc);
 155 }
 156
 157 static int osp_init_last_objid(const struct lu_env *env, struct osp_device *osp)
 158 {
 159         struct osp_thread_info  *osi = osp_env_info(env);
 160         struct lu_fid           *fid = &osp->opd_last_used_fid;
 161         struct dt_object        *dto;
 162         int                     rc;
 163         ENTRY;
 164
 165         dto = osp_find_or_create(env, osp, &osi->osi_attr, MDD_LOV_OBJ_OID);
 166         if (IS_ERR(dto))
 167                 RETURN(PTR_ERR(dto));
 168         /* object will be released in device cleanup path */
 169         if (osi->osi_attr.la_size >=
 170             sizeof(osi->osi_id) * (osp->opd_index + 1)) {
 171                 osp_objid_buf_prep(&osi->osi_lb, &osi->osi_off, &fid->f_oid,
 172                                    osp->opd_index);
 173                 rc = dt_record_read(env, dto, &osi->osi_lb, &osi->osi_off);
 174                 if (rc != 0)
 175                         GOTO(out, rc);
 176         } else {
 177                 fid->f_oid = 0;
 178                 osp_objid_buf_prep(&osi->osi_lb, &osi->osi_off, &fid->f_oid,
 179                                    osp->opd_index);
 180                 rc = osp_write_local_file(env, osp, dto, &osi->osi_lb,
 181                                           osi->osi_off);
 182         }
 183         osp->opd_last_used_oid_file = dto;
 184         RETURN(0);
 185 out:
 186         /* object will be released in device cleanup path */
 187         CERROR("%s: can't initialize lov_objid: rc = %d\n",
 188                osp->opd_obd->obd_name, rc);
 189         lu_object_put(env, &dto->do_lu);
 190         osp->opd_last_used_oid_file = NULL;
 191         RETURN(rc);
 192 }
 193
 194 static int osp_init_last_seq(const struct lu_env *env, struct osp_device *osp)
 195 {
 196         struct osp_thread_info  *osi = osp_env_info(env);
 197         struct lu_fid           *fid = &osp->opd_last_used_fid;
 198         struct dt_object        *dto;
 199         int                     rc;
 200         ENTRY;
 201
 202         dto = osp_find_or_create(env, osp, &osi->osi_attr, MDD_LOV_OBJ_OSEQ);
 203         if (IS_ERR(dto))
 204                 RETURN(PTR_ERR(dto));
 205
 206         /* object will be released in device cleanup path */
 207         if (osi->osi_attr.la_size >=
 208             sizeof(osi->osi_id) * (osp->opd_index + 1)) {
 209                 osp_objseq_buf_prep(&osi->osi_lb, &osi->osi_off, &fid->f_seq,
 210                                    osp->opd_index);
 211                 rc = dt_record_read(env, dto, &osi->osi_lb, &osi->osi_off);
 212                 if (rc != 0)
 213                         GOTO(out, rc);
 214         } else {
 215                 fid->f_seq = 0;
 216                 osp_objseq_buf_prep(&osi->osi_lb, &osi->osi_off, &fid->f_seq,
 217                                     osp->opd_index);
 218                 rc = osp_write_local_file(env, osp, dto, &osi->osi_lb,
 219                                           osi->osi_off);
 220         }
 221         osp->opd_last_used_seq_file = dto;
 222         RETURN(0);
 223 out:
 224         /* object will be released in device cleanup path */
 225         CERROR("%s: can't initialize lov_seq: rc = %d\n",
 226                osp->opd_obd->obd_name, rc);
 227         lu_object_put(env, &dto->do_lu);
 228         osp->opd_last_used_seq_file = NULL;
 229         RETURN(rc);
 230 }
 231
 232 static int osp_last_used_init(const struct lu_env *env, struct osp_device *osp)
 233 {
 234         struct osp_thread_info *osi = osp_env_info(env);
 235         int                  rc;
 236         ENTRY;
 237
 238         fid_zero(&osp->opd_last_used_fid);
 239         rc = osp_init_last_objid(env, osp);
 240         if (rc < 0) {
 241                 CERROR("%s: Can not get ids %d from old objid!\n",
 242                        osp->opd_obd->obd_name, rc);
 243                 RETURN(rc);
 244         }
 245
 246         rc = osp_init_last_seq(env, osp);
 247         if (rc < 0) {
 248                 CERROR("%s: Can not get ids %d from old objid!\n",
 249                        osp->opd_obd->obd_name, rc);
 250                 GOTO(out, rc);
 251         }
 252
 253         if (fid_oid(&osp->opd_last_used_fid) != 0 &&
 254             fid_seq(&osp->opd_last_used_fid) == 0) {
 255                 /* Just upgrade from the old version,
 256                  * set the seq to be IDIF */
 257                 osp->opd_last_used_fid.f_seq =
 258                    fid_idif_seq(fid_oid(&osp->opd_last_used_fid),
 259                                 osp->opd_index);
 260                 osp_objseq_buf_prep(&osi->osi_lb, &osi->osi_off,
 261                                     &osp->opd_last_used_fid.f_seq,
 262                                     osp->opd_index);
 263                 rc = osp_write_local_file(env, osp, osp->opd_last_used_seq_file,
 264                                           &osi->osi_lb, osi->osi_off);
 265                 if (rc) {
 266                         CERROR("%s : Can not write seq file: rc = %d\n",
 267                                osp->opd_obd->obd_name, rc);
 268                         GOTO(out, rc);
 269                 }
 270         }
 271
 272         if (!fid_is_zero(&osp->opd_last_used_fid) &&
 273                  !fid_is_sane(&osp->opd_last_used_fid)) {
 274                 CERROR("%s: Got invalid FID "DFID"\n", osp->opd_obd->obd_name,
 275                         PFID(&osp->opd_last_used_fid));
 276                 GOTO(out, rc = -EINVAL);
 277         }
 278
 279         CDEBUG(D_INFO, "%s: Init last used fid "DFID"\n",
 280                osp->opd_obd->obd_name, PFID(&osp->opd_last_used_fid));
 281 out:
 282         if (rc != 0) {
 283                 if (osp->opd_last_used_oid_file != NULL) {
 284                         lu_object_put(env, &osp->opd_last_used_oid_file->do_lu);
 285                         osp->opd_last_used_oid_file = NULL;
 286                 }
 287                 if (osp->opd_last_used_seq_file != NULL) {
 288                         lu_object_put(env, &osp->opd_last_used_seq_file->do_lu);
 289                         osp->opd_last_used_seq_file = NULL;
 290                 }
 291         }
 292
 293         RETURN(rc);
 294 }
 295
 296 static void osp_last_used_fini(const struct lu_env *env, struct osp_device *d)
 297 {
 298         /* release last_used file */
 299         if (d->opd_last_used_oid_file != NULL) {
 300                 lu_object_put(env, &d->opd_last_used_oid_file->do_lu);
 301                 d->opd_last_used_oid_file = NULL;
 302         }
 303
 304         if (d->opd_last_used_seq_file != NULL) {
 305                 lu_object_put(env, &d->opd_last_used_seq_file->do_lu);
 306                 d->opd_last_used_seq_file = NULL;
 307         }
 308 }
 309
 310 static int osp_disconnect(struct osp_device *d)
 311 {
 312         struct obd_import *imp;
 313         int rc = 0;
 314
 315         imp = d->opd_obd->u.cli.cl_import;
 316
 317         /* Mark import deactivated now, so we don't try to reconnect if any
 318          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 319          * fully deactivate the import, or that would drop all requests. */
 320         LASSERT(imp != NULL);
 321         spin_lock(&imp->imp_lock);
 322         imp->imp_deactive = 1;
 323         spin_unlock(&imp->imp_lock);
 324
 325         ptlrpc_deactivate_import(imp);
 326
 327         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 328          * delete it regardless.  (It's safe to delete an import that was
 329          * never added.) */
 330         (void)ptlrpc_pinger_del_import(imp);
 331
 332         rc = ptlrpc_disconnect_import(imp, 0);
 333         if (rc != 0)
 334                 CERROR("%s: can't disconnect: rc = %d\n",
 335                        d->opd_obd->obd_name, rc);
 336
 337         ptlrpc_invalidate_import(imp);
 338
 339         RETURN(rc);
 340 }
 341
 342 static int osp_shutdown(const struct lu_env *env, struct osp_device *d)
 343 {
 344         int                      rc = 0;
 345         ENTRY;
 346
 347         LASSERT(env);
 348
 349         rc = osp_disconnect(d);
 350
 351         osp_sync_fini(d);
 352
 353         if (!d->opd_connect_mdt) {
 354                 /* stop precreate thread */
 355                 osp_precreate_fini(d);
 356
 357                 /* release last_used file */
 358                 osp_last_used_fini(env, d);
 359         }
 360
 361         obd_fid_fini(d->opd_obd);
 362
 363         RETURN(rc);
 364 }
 365
 366 static int osp_process_config(const struct lu_env *env,
 367                               struct lu_device *dev, struct lustre_cfg *lcfg)
 368 {
 369         struct osp_device               *d = lu2osp_dev(dev);
 370         struct obd_device               *obd = d->opd_obd;
 371         int                              rc;
 372
 373         ENTRY;
 374
 375         switch (lcfg->lcfg_command) {
 376         case LCFG_PRE_CLEANUP:
 377                 rc = osp_disconnect(d);
 378                 break;
 379         case LCFG_CLEANUP:
 380                 lu_dev_del_linkage(dev->ld_site, dev);
 381                 rc = osp_shutdown(env, d);
 382                 break;
 383         case LCFG_PARAM:
 384                 LASSERT(obd);
 385                 rc = class_process_proc_seq_param(PARAM_OSC, obd->obd_vars,
 386                                                   lcfg, obd);
 387                 if (rc > 0)
 388                         rc = 0;
 389                 if (rc == -ENOSYS) {
 390                         /* class_process_proc_param() haven't found matching
 391                          * parameter and returned ENOSYS so that layer(s)
 392                          * below could use that. But OSP is the bottom, so
 393                          * just ignore it */
 394                         CERROR("%s: unknown param %s\n",
 395                                (char *)lustre_cfg_string(lcfg, 0),
 396                                (char *)lustre_cfg_string(lcfg, 1));
 397                         rc = 0;
 398                 }
 399                 break;
 400         default:
 401                 CERROR("%s: unknown command %u\n",
 402                        (char *)lustre_cfg_string(lcfg, 0), lcfg->lcfg_command);
 403                 rc = 0;
 404                 break;
 405         }
 406
 407         RETURN(rc);
 408 }
 409
 410 static int osp_recovery_complete(const struct lu_env *env,
 411                                  struct lu_device *dev)
 412 {
 413         struct osp_device       *osp = lu2osp_dev(dev);
 414         int                      rc = 0;
 415
 416         ENTRY;
 417         osp->opd_recovery_completed = 1;
 418
 419         if (!osp->opd_connect_mdt && osp->opd_pre != NULL)
 420                 wake_up(&osp->opd_pre_waitq);
 421         RETURN(rc);
 422 }
 423
 424 const struct lu_device_operations osp_lu_ops = {
 425         .ldo_object_alloc       = osp_object_alloc,
 426         .ldo_process_config     = osp_process_config,
 427         .ldo_recovery_complete  = osp_recovery_complete,
 428 };
 429
 430 /**
 431  * provides with statfs from corresponded OST
 432  *
 433  */
 434 static int osp_statfs(const struct lu_env *env, struct dt_device *dev,
 435                       struct obd_statfs *sfs)
 436 {
 437         struct osp_device *d = dt2osp_dev(dev);
 438
 439         ENTRY;
 440
 441         if (unlikely(d->opd_imp_active == 0))
 442                 RETURN(-ENOTCONN);
 443
 444         if (d->opd_pre == NULL)
 445                 RETURN(0);
 446
 447         /* return recently updated data */
 448         *sfs = d->opd_statfs;
 449
 450         /*
 451          * layer above osp (usually lod) can use ffree to estimate
 452          * how many objects are available for immediate creation
 453          */
 454         spin_lock(&d->opd_pre_lock);
 455         LASSERTF(fid_seq(&d->opd_pre_last_created_fid) ==
 456                  fid_seq(&d->opd_pre_used_fid),
 457                  "last_created "DFID", next_fid "DFID"\n",
 458                  PFID(&d->opd_pre_last_created_fid),
 459                  PFID(&d->opd_pre_used_fid));
 460         sfs->os_fprecreated = fid_oid(&d->opd_pre_last_created_fid) -
 461                               fid_oid(&d->opd_pre_used_fid);
 462         sfs->os_fprecreated -= d->opd_pre_reserved;
 463         spin_unlock(&d->opd_pre_lock);
 464
 465         LASSERT(sfs->os_fprecreated <= OST_MAX_PRECREATE * 2);
 466
 467         CDEBUG(D_OTHER, "%s: "LPU64" blocks, "LPU64" free, "LPU64" avail, "
 468                LPU64" files, "LPU64" free files\n", d->opd_obd->obd_name,
 469                sfs->os_blocks, sfs->os_bfree, sfs->os_bavail,
 470                sfs->os_files, sfs->os_ffree);
 471         RETURN(0);
 472 }
 473
 474 static int osp_sync(const struct lu_env *env, struct dt_device *dev)
 475 {
 476         ENTRY;
 477
 478         /*
 479          * XXX: wake up sync thread, command it to start flushing asap?
 480          */
 481
 482         RETURN(0);
 483 }
 484
 485 const struct dt_device_operations osp_dt_ops = {
 486         .dt_statfs       = osp_statfs,
 487         .dt_sync         = osp_sync,
 488         .dt_trans_create = osp_trans_create,
 489         .dt_trans_start  = osp_trans_start,
 490         .dt_trans_stop   = osp_trans_stop,
 491 };
 492
 493 static int osp_connect_to_osd(const struct lu_env *env, struct osp_device *m,
 494                               const char *nextdev)
 495 {
 496         struct obd_connect_data *data = NULL;
 497         struct obd_device       *obd;
 498         int                      rc;
 499
 500         ENTRY;
 501
 502         LASSERT(m->opd_storage_exp == NULL);
 503
 504         OBD_ALLOC_PTR(data);
 505         if (data == NULL)
 506                 RETURN(-ENOMEM);
 507
 508         obd = class_name2obd(nextdev);
 509         if (obd == NULL) {
 510                 CERROR("%s: can't locate next device: %s\n",
 511                        m->opd_obd->obd_name, nextdev);
 512                 GOTO(out, rc = -ENOTCONN);
 513         }
 514
 515         rc = obd_connect(env, &m->opd_storage_exp, obd, &obd->obd_uuid, data,
 516                          NULL);
 517         if (rc) {
 518                 CERROR("%s: cannot connect to next dev %s: rc = %d\n",
 519                        m->opd_obd->obd_name, nextdev, rc);
 520                 GOTO(out, rc);
 521         }
 522
 523         m->opd_dt_dev.dd_lu_dev.ld_site =
 524                 m->opd_storage_exp->exp_obd->obd_lu_dev->ld_site;
 525         LASSERT(m->opd_dt_dev.dd_lu_dev.ld_site);
 526         m->opd_storage = lu2dt_dev(m->opd_storage_exp->exp_obd->obd_lu_dev);
 527
 528 out:
 529         OBD_FREE_PTR(data);
 530         RETURN(rc);
 531 }
 532
 533 static int osp_init0(const struct lu_env *env, struct osp_device *m,
 534                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
 535 {
 536         struct obd_device       *obd;
 537         struct obd_import       *imp;
 538         class_uuid_t            uuid;
 539         char                    *src, *tgt, *mdt, *osdname = NULL;
 540         int                     rc;
 541         long                    idx;
 542
 543         ENTRY;
 544
 545         mutex_init(&m->opd_async_requests_mutex);
 546
 547         obd = class_name2obd(lustre_cfg_string(cfg, 0));
 548         if (obd == NULL) {
 549                 CERROR("Cannot find obd with name %s\n",
 550                        lustre_cfg_string(cfg, 0));
 551                 RETURN(-ENODEV);
 552         }
 553         m->opd_obd = obd;
 554
 555         /* There is no record in the MDT configuration for the local disk
 556          * device, so we have to extract this from elsewhere in the profile.
 557          * The only information we get at setup is from the OSC records:
 558          * setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 559          * Note that 1.8 generated configs are missing the -MDTxxxx part.
 560          * We need to reconstruct the name of the underlying OSD from this:
 561          * {fsname}-{svname}-osd, for example "lustre-MDT0000-osd".  We
 562          * also need to determine the OST index from this - will be used
 563          * to calculate the offset in shared lov_objids file later */
 564
 565         src = lustre_cfg_string(cfg, 0);
 566         if (src == NULL)
 567                 RETURN(-EINVAL);
 568
 569         tgt = strrchr(src, '-');
 570         if (tgt == NULL) {
 571                 CERROR("%s: invalid target name %s\n",
 572                        m->opd_obd->obd_name, lustre_cfg_string(cfg, 0));
 573                 RETURN(-EINVAL);
 574         }
 575
 576         if (strncmp(tgt, "-osc", 4) == 0) {
 577                 /* Old OSC name fsname-OSTXXXX-osc */
 578                 for (tgt--; tgt > src && *tgt != '-'; tgt--)
 579                         ;
 580                 if (tgt == src) {
 581                         CERROR("%s: invalid target name %s\n",
 582                                m->opd_obd->obd_name, lustre_cfg_string(cfg, 0));
 583                         RETURN(-EINVAL);
 584                 }
 585
 586                 if (strncmp(tgt, "-OST", 4) != 0) {
 587                         CERROR("%s: invalid target name %s\n",
 588                                m->opd_obd->obd_name, lustre_cfg_string(cfg, 0));
 589                         RETURN(-EINVAL);
 590                 }
 591
 592                 idx = simple_strtol(tgt + 4, &mdt, 16);
 593                 if (mdt[0] != '-' || idx > INT_MAX || idx < 0) {
 594                         CERROR("%s: invalid OST index in '%s'\n",
 595                                m->opd_obd->obd_name, src);
 596                         RETURN(-EINVAL);
 597                 }
 598                 m->opd_index = idx;
 599                 m->opd_group = 0;
 600                 idx = tgt - src;
 601         } else {
 602                 /* New OSC name fsname-OSTXXXX-osc-MDTXXXX */
 603                 if (strncmp(tgt, "-MDT", 4) != 0 &&
 604                     strncmp(tgt, "-OST", 4) != 0) {
 605                         CERROR("%s: invalid target name %s\n",
 606                                m->opd_obd->obd_name, lustre_cfg_string(cfg, 0));
 607                         RETURN(-EINVAL);
 608                 }
 609
 610                 idx = simple_strtol(tgt + 4, &mdt, 16);
 611                 if (*mdt != '\0' || idx > INT_MAX || idx < 0) {
 612                         CERROR("%s: invalid OST index in '%s'\n",
 613                                m->opd_obd->obd_name, src);
 614                         RETURN(-EINVAL);
 615                 }
 616
 617                 /* Get MDT index from the name and set it to opd_group,
 618                  * which will be used by OSP to connect with OST */
 619                 m->opd_group = idx;
 620                 if (tgt - src <= 12) {
 621                         CERROR("%s: invalid mdt index retrieve from %s\n",
 622                                m->opd_obd->obd_name, lustre_cfg_string(cfg, 0));
 623                         RETURN(-EINVAL);
 624                 }
 625
 626                 if (strncmp(tgt - 12, "-MDT", 4) == 0)
 627                         m->opd_connect_mdt = 1;
 628
 629                 idx = simple_strtol(tgt - 8, &mdt, 16);
 630                 if (mdt[0] != '-' || idx > INT_MAX || idx < 0) {
 631                         CERROR("%s: invalid OST index in '%s'\n",
 632                                m->opd_obd->obd_name, src);
 633                         RETURN(-EINVAL);
 634                 }
 635
 636                 m->opd_index = idx;
 637                 idx = tgt - src - 12;
 638         }
 639         /* check the fsname length, and after this everything else will fit */
 640         if (idx > MTI_NAME_MAXLEN) {
 641                 CERROR("%s: fsname too long in '%s'\n",
 642                        m->opd_obd->obd_name, src);
 643                 RETURN(-EINVAL);
 644         }
 645
 646         OBD_ALLOC(osdname, MAX_OBD_NAME);
 647         if (osdname == NULL)
 648                 RETURN(-ENOMEM);
 649
 650         memcpy(osdname, src, idx); /* copy just the fsname part */
 651         osdname[idx] = '\0';
 652
 653         mdt = strstr(mdt, "-MDT");
 654         if (mdt == NULL) /* 1.8 configs don't have "-MDT0000" at the end */
 655                 strcat(osdname, "-MDT0000");
 656         else
 657                 strcat(osdname, mdt);
 658         strcat(osdname, "-osd");
 659         CDEBUG(D_HA, "%s: connect to %s (%s)\n", obd->obd_name, osdname, src);
 660
 661         if (m->opd_connect_mdt) {
 662                 struct client_obd *cli = &m->opd_obd->u.cli;
 663
 664                 OBD_ALLOC(cli->cl_rpc_lock, sizeof(*cli->cl_rpc_lock));
 665                 if (!cli->cl_rpc_lock)
 666                         GOTO(out_fini, rc = -ENOMEM);
 667                 osp_init_rpc_lock(cli->cl_rpc_lock);
 668         }
 669
 670         m->opd_dt_dev.dd_lu_dev.ld_ops = &osp_lu_ops;
 671         m->opd_dt_dev.dd_ops = &osp_dt_ops;
 672         obd->obd_lu_dev = &m->opd_dt_dev.dd_lu_dev;
 673
 674         rc = osp_connect_to_osd(env, m, osdname);
 675         if (rc)
 676                 GOTO(out_fini, rc);
 677
 678         rc = ptlrpcd_addref();
 679         if (rc)
 680                 GOTO(out_disconnect, rc);
 681
 682         rc = client_obd_setup(obd, cfg);
 683         if (rc) {
 684                 CERROR("%s: can't setup obd: %d\n", m->opd_obd->obd_name, rc);
 685                 GOTO(out_ref, rc);
 686         }
 687
 688         osp_lprocfs_init(m);
 689
 690         rc = obd_fid_init(m->opd_obd, NULL, m->opd_connect_mdt ?
 691                           LUSTRE_SEQ_METADATA : LUSTRE_SEQ_DATA);
 692         if (rc) {
 693                 CERROR("%s: fid init error: rc = %d\n",
 694                        m->opd_obd->obd_name, rc);
 695                 GOTO(out_proc, rc);
 696         }
 697
 698         if (!m->opd_connect_mdt) {
 699                 /* Initialize last id from the storage - will be
 700                  * used in orphan cleanup. */
 701                 rc = osp_last_used_init(env, m);
 702                 if (rc)
 703                         GOTO(out_proc, rc);
 704
 705
 706                 /* Initialize precreation thread, it handles new
 707                  * connections as well. */
 708                 rc = osp_init_precreate(m);
 709                 if (rc)
 710                         GOTO(out_last_used, rc);
 711         }
 712
 713         /*
 714          * Initialize synhronization mechanism taking
 715          * care of propogating changes to OST in near
 716          * transactional manner.
 717          */
 718         rc = osp_sync_init(env, m);
 719         if (rc)
 720                 GOTO(out_precreat, rc);
 721
 722         /*
 723          * Initiate connect to OST
 724          */
 725         ll_generate_random_uuid(uuid);
 726         class_uuid_unparse(uuid, &m->opd_cluuid);
 727
 728         imp = obd->u.cli.cl_import;
 729
 730         rc = ptlrpc_init_import(imp);
 731         if (rc)
 732                 GOTO(out, rc);
 733         if (osdname)
 734                 OBD_FREE(osdname, MAX_OBD_NAME);
 735         RETURN(0);
 736
 737 out:
 738         /* stop sync thread */
 739         osp_sync_fini(m);
 740 out_precreat:
 741         /* stop precreate thread */
 742         if (!m->opd_connect_mdt)
 743                 osp_precreate_fini(m);
 744 out_last_used:
 745         if (!m->opd_connect_mdt)
 746                 osp_last_used_fini(env, m);
 747 out_proc:
 748         ptlrpc_lprocfs_unregister_obd(obd);
 749         lprocfs_obd_cleanup(obd);
 750         if (m->opd_symlink)
 751                 lprocfs_remove(&m->opd_symlink);
 752         client_obd_cleanup(obd);
 753 out_ref:
 754         ptlrpcd_decref();
 755 out_disconnect:
 756         if (m->opd_connect_mdt) {
 757                 struct client_obd *cli = &m->opd_obd->u.cli;
 758                 if (cli->cl_rpc_lock != NULL) {
 759                         OBD_FREE_PTR(cli->cl_rpc_lock);
 760                         cli->cl_rpc_lock = NULL;
 761                 }
 762         }
 763         obd_disconnect(m->opd_storage_exp);
 764 out_fini:
 765         if (osdname)
 766                 OBD_FREE(osdname, MAX_OBD_NAME);
 767         RETURN(rc);
 768 }
 769
 770 static struct lu_device *osp_device_free(const struct lu_env *env,
 771                                          struct lu_device *lu)
 772 {
 773         struct osp_device *m = lu2osp_dev(lu);
 774
 775         ENTRY;
 776
 777         if (atomic_read(&lu->ld_ref) && lu->ld_site) {
 778                 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
 779                 lu_site_print(env, lu->ld_site, &msgdata, lu_cdebug_printer);
 780         }
 781         dt_device_fini(&m->opd_dt_dev);
 782         OBD_FREE_PTR(m);
 783         RETURN(NULL);
 784 }
 785
 786 static struct lu_device *osp_device_alloc(const struct lu_env *env,
 787                                           struct lu_device_type *t,
 788                                           struct lustre_cfg *lcfg)
 789 {
 790         struct osp_device *m;
 791         struct lu_device  *l;
 792
 793         OBD_ALLOC_PTR(m);
 794         if (m == NULL) {
 795                 l = ERR_PTR(-ENOMEM);
 796         } else {
 797                 int rc;
 798
 799                 l = osp2lu_dev(m);
 800                 dt_device_init(&m->opd_dt_dev, t);
 801                 rc = osp_init0(env, m, t, lcfg);
 802                 if (rc != 0) {
 803                         osp_device_free(env, l);
 804                         l = ERR_PTR(rc);
 805                 }
 806         }
 807         return l;
 808 }
 809
 810 static struct lu_device *osp_device_fini(const struct lu_env *env,
 811                                          struct lu_device *d)
 812 {
 813         struct osp_device *m = lu2osp_dev(d);
 814         struct obd_import *imp;
 815         int                rc;
 816
 817         ENTRY;
 818
 819         if (m->opd_async_requests != NULL) {
 820                 out_destroy_update_req(m->opd_async_requests);
 821                 m->opd_async_requests = NULL;
 822         }
 823
 824         if (m->opd_storage_exp)
 825                 obd_disconnect(m->opd_storage_exp);
 826
 827         imp = m->opd_obd->u.cli.cl_import;
 828
 829         if (imp->imp_rq_pool) {
 830                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 831                 imp->imp_rq_pool = NULL;
 832         }
 833
 834         if (m->opd_symlink)
 835                 lprocfs_remove(&m->opd_symlink);
 836
 837         LASSERT(m->opd_obd);
 838         ptlrpc_lprocfs_unregister_obd(m->opd_obd);
 839         lprocfs_obd_cleanup(m->opd_obd);
 840
 841         if (m->opd_connect_mdt) {
 842                 struct client_obd *cli = &m->opd_obd->u.cli;
 843                 if (cli->cl_rpc_lock != NULL) {
 844                         OBD_FREE_PTR(cli->cl_rpc_lock);
 845                         cli->cl_rpc_lock = NULL;
 846                 }
 847         }
 848
 849         rc = client_obd_cleanup(m->opd_obd);
 850         LASSERTF(rc == 0, "error %d\n", rc);
 851
 852         ptlrpcd_decref();
 853
 854         RETURN(NULL);
 855 }
 856
 857 static int osp_reconnect(const struct lu_env *env,
 858                          struct obd_export *exp, struct obd_device *obd,
 859                          struct obd_uuid *cluuid,
 860                          struct obd_connect_data *data,
 861                          void *localdata)
 862 {
 863         return 0;
 864 }
 865
 866 static int osp_prepare_fid_client(struct osp_device *osp)
 867 {
 868         LASSERT(osp->opd_obd->u.cli.cl_seq != NULL);
 869         if (osp->opd_obd->u.cli.cl_seq->lcs_exp != NULL)
 870                 return 0;
 871
 872         LASSERT(osp->opd_exp != NULL);
 873         osp->opd_obd->u.cli.cl_seq->lcs_exp =
 874                                 class_export_get(osp->opd_exp);
 875         return 0;
 876 }
 877
 878 /*
 879  * we use exports to track all LOD users
 880  */
 881 static int osp_obd_connect(const struct lu_env *env, struct obd_export **exp,
 882                            struct obd_device *obd, struct obd_uuid *cluuid,
 883                            struct obd_connect_data *data, void *localdata)
 884 {
 885         struct osp_device       *osp = lu2osp_dev(obd->obd_lu_dev);
 886         struct obd_connect_data *ocd;
 887         struct obd_import       *imp;
 888         struct lustre_handle     conn;
 889         int                      rc;
 890
 891         ENTRY;
 892
 893         CDEBUG(D_CONFIG, "connect #%d\n", osp->opd_connects);
 894
 895         rc = class_connect(&conn, obd, cluuid);
 896         if (rc)
 897                 RETURN(rc);
 898
 899         *exp = class_conn2export(&conn);
 900         /* Why should there ever be more than 1 connect? */
 901         osp->opd_connects++;
 902         LASSERT(osp->opd_connects == 1);
 903
 904         osp->opd_exp = *exp;
 905
 906         imp = osp->opd_obd->u.cli.cl_import;
 907         imp->imp_dlm_handle = conn;
 908
 909         LASSERT(data != NULL);
 910         LASSERT(data->ocd_connect_flags & OBD_CONNECT_INDEX);
 911         ocd = &imp->imp_connect_data;
 912         *ocd = *data;
 913
 914         imp->imp_connect_flags_orig = ocd->ocd_connect_flags;
 915
 916         ocd->ocd_version = LUSTRE_VERSION_CODE;
 917         ocd->ocd_index = data->ocd_index;
 918         imp->imp_connect_flags_orig = ocd->ocd_connect_flags;
 919
 920         rc = ptlrpc_connect_import(imp);
 921         if (rc) {
 922                 CERROR("%s: can't connect obd: rc = %d\n", obd->obd_name, rc);
 923                 GOTO(out, rc);
 924         }
 925
 926         ptlrpc_pinger_add_import(imp);
 927 out:
 928         RETURN(rc);
 929 }
 930
 931 /*
 932  * once last export (we don't count self-export) disappeared
 933  * osp can be released
 934  */
 935 static int osp_obd_disconnect(struct obd_export *exp)
 936 {
 937         struct obd_device *obd = exp->exp_obd;
 938         struct osp_device *osp = lu2osp_dev(obd->obd_lu_dev);
 939         int                rc;
 940         ENTRY;
 941
 942         /* Only disconnect the underlying layers on the final disconnect. */
 943         LASSERT(osp->opd_connects == 1);
 944         osp->opd_connects--;
 945
 946         rc = class_disconnect(exp);
 947         if (rc) {
 948                 CERROR("%s: class disconnect error: rc = %d\n",
 949                        obd->obd_name, rc);
 950                 RETURN(rc);
 951         }
 952
 953         /* destroy the device */
 954         class_manual_cleanup(obd);
 955
 956         RETURN(rc);
 957 }
 958
 959 /*
 960  * lprocfs helpers still use OBD API, let's keep obd_statfs() support
 961  */
 962 static int osp_obd_statfs(const struct lu_env *env, struct obd_export *exp,
 963                           struct obd_statfs *osfs, __u64 max_age, __u32 flags)
 964 {
 965         struct obd_statfs       *msfs;
 966         struct ptlrpc_request   *req;
 967         struct obd_import       *imp = NULL;
 968         int                      rc;
 969
 970         ENTRY;
 971
 972         /* Since the request might also come from lprocfs, so we need
 973          * sync this with client_disconnect_export Bug15684 */
 974         down_read(&exp->exp_obd->u.cli.cl_sem);
 975         if (exp->exp_obd->u.cli.cl_import)
 976                 imp = class_import_get(exp->exp_obd->u.cli.cl_import);
 977         up_read(&exp->exp_obd->u.cli.cl_sem);
 978         if (!imp)
 979                 RETURN(-ENODEV);
 980
 981         /* We could possibly pass max_age in the request (as an absolute
 982          * timestamp or a "seconds.usec ago") so the target can avoid doing
 983          * extra calls into the filesystem if that isn't necessary (e.g.
 984          * during mount that would help a bit).  Having relative timestamps
 985          * is not so great if request processing is slow, while absolute
 986          * timestamps are not ideal because they need time synchronization. */
 987         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
 988
 989         class_import_put(imp);
 990
 991         if (req == NULL)
 992                 RETURN(-ENOMEM);
 993
 994         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
 995         if (rc) {
 996                 ptlrpc_request_free(req);
 997                 RETURN(rc);
 998         }
 999         ptlrpc_request_set_replen(req);
1000         req->rq_request_portal = OST_CREATE_PORTAL;
1001         ptlrpc_at_set_req_timeout(req);
1002
1003         if (flags & OBD_STATFS_NODELAY) {
1004                 /* procfs requests not want stat in wait for avoid deadlock */
1005                 req->rq_no_resend = 1;
1006                 req->rq_no_delay = 1;
1007         }
1008
1009         rc = ptlrpc_queue_wait(req);
1010         if (rc)
1011                 GOTO(out, rc);
1012
1013         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1014         if (msfs == NULL)
1015                 GOTO(out, rc = -EPROTO);
1016
1017         *osfs = *msfs;
1018
1019         EXIT;
1020 out:
1021         ptlrpc_req_finished(req);
1022         return rc;
1023 }
1024
1025 static int osp_import_event(struct obd_device *obd, struct obd_import *imp,
1026                             enum obd_import_event event)
1027 {
1028         struct osp_device *d = lu2osp_dev(obd->obd_lu_dev);
1029
1030         switch (event) {
1031         case IMP_EVENT_DISCON:
1032                 d->opd_got_disconnected = 1;
1033                 d->opd_imp_connected = 0;
1034                 if (d->opd_connect_mdt)
1035                         break;
1036
1037                 if (d->opd_pre != NULL) {
1038                         osp_pre_update_status(d, -ENODEV);
1039                         wake_up(&d->opd_pre_waitq);
1040                 }
1041
1042                 CDEBUG(D_HA, "got disconnected\n");
1043                 break;
1044         case IMP_EVENT_INACTIVE:
1045                 d->opd_imp_active = 0;
1046                 if (d->opd_connect_mdt)
1047                         break;
1048
1049                 if (d->opd_pre != NULL) {
1050                         osp_pre_update_status(d, -ENODEV);
1051                         wake_up(&d->opd_pre_waitq);
1052                 }
1053
1054                 CDEBUG(D_HA, "got inactive\n");
1055                 break;
1056         case IMP_EVENT_ACTIVE:
1057                 d->opd_imp_active = 1;
1058
1059                 if (osp_prepare_fid_client(d) != 0)
1060                         break;
1061
1062                 if (d->opd_got_disconnected)
1063                         d->opd_new_connection = 1;
1064                 d->opd_imp_connected = 1;
1065                 d->opd_imp_seen_connected = 1;
1066                 if (d->opd_connect_mdt)
1067                         break;
1068
1069                 if (d->opd_pre != NULL)
1070                         wake_up(&d->opd_pre_waitq);
1071
1072                 __osp_sync_check_for_work(d);
1073                 CDEBUG(D_HA, "got connected\n");
1074                 break;
1075         case IMP_EVENT_INVALIDATE:
1076                 if (obd->obd_namespace == NULL)
1077                         break;
1078                 ldlm_namespace_cleanup(obd->obd_namespace, LDLM_FL_LOCAL_ONLY);
1079                 break;
1080         case IMP_EVENT_OCD:
1081         case IMP_EVENT_DEACTIVATE:
1082         case IMP_EVENT_ACTIVATE:
1083                 break;
1084         default:
1085                 CERROR("%s: unsupported import event: %#x\n",
1086                        obd->obd_name, event);
1087         }
1088         return 0;
1089 }
1090
1091 static int osp_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1092                          void *karg, void *uarg)
1093 {
1094         struct obd_device       *obd = exp->exp_obd;
1095         struct osp_device       *d;
1096         struct obd_ioctl_data   *data = karg;
1097         int                      rc = 0;
1098
1099         ENTRY;
1100
1101         LASSERT(obd->obd_lu_dev);
1102         d = lu2osp_dev(obd->obd_lu_dev);
1103         LASSERT(d->opd_dt_dev.dd_ops == &osp_dt_ops);
1104
1105         if (!try_module_get(THIS_MODULE)) {
1106                 CERROR("%s: can't get module. Is it alive?", obd->obd_name);
1107                 return -EINVAL;
1108         }
1109
1110         switch (cmd) {
1111         case OBD_IOC_CLIENT_RECOVER:
1112                 rc = ptlrpc_recover_import(obd->u.cli.cl_import,
1113                                            data->ioc_inlbuf1, 0);
1114                 if (rc > 0)
1115                         rc = 0;
1116                 break;
1117         case IOC_OSC_SET_ACTIVE:
1118                 rc = ptlrpc_set_import_active(obd->u.cli.cl_import,
1119                                               data->ioc_offset);
1120                 break;
1121         case OBD_IOC_PING_TARGET:
1122                 rc = ptlrpc_obd_ping(obd);
1123                 break;
1124         default:
1125                 CERROR("%s: unrecognized ioctl %#x by %s\n", obd->obd_name,
1126                        cmd, current_comm());
1127                 rc = -ENOTTY;
1128         }
1129         module_put(THIS_MODULE);
1130         return rc;
1131 }
1132
1133 static int osp_obd_get_info(const struct lu_env *env, struct obd_export *exp,
1134                             __u32 keylen, void *key, __u32 *vallen, void *val,
1135                             struct lov_stripe_md *lsm)
1136 {
1137         int rc = -EINVAL;
1138
1139         if (KEY_IS(KEY_OSP_CONNECTED)) {
1140                 struct obd_device       *obd = exp->exp_obd;
1141                 struct osp_device       *osp;
1142
1143                 if (!obd->obd_set_up || obd->obd_stopping)
1144                         RETURN(-EAGAIN);
1145
1146                 osp = lu2osp_dev(obd->obd_lu_dev);
1147                 LASSERT(osp);
1148                 /*
1149                  * 1.8/2.0 behaviour is that OST being connected once at least
1150                  * is considered "healthy". and one "healthy" OST is enough to
1151                  * allow lustre clients to connect to MDS
1152                  */
1153                 RETURN(!osp->opd_imp_seen_connected);
1154         }
1155
1156         RETURN(rc);
1157 }
1158
1159 int osp_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1160                   struct lu_fid *fid, struct md_op_data *op_data)
1161 {
1162         struct client_obd       *cli = &exp->exp_obd->u.cli;
1163         struct osp_device       *osp = lu2osp_dev(exp->exp_obd->obd_lu_dev);
1164         struct lu_client_seq    *seq = cli->cl_seq;
1165         ENTRY;
1166
1167         LASSERT(osp->opd_obd->u.cli.cl_seq != NULL);
1168         /* Sigh, fid client is not ready yet */
1169         if (osp->opd_obd->u.cli.cl_seq->lcs_exp == NULL)
1170                 RETURN(-ENOTCONN);
1171
1172         RETURN(seq_client_alloc_fid(env, seq, fid));
1173 }
1174
1175 /* context key constructor/destructor: mdt_key_init, mdt_key_fini */
1176 LU_KEY_INIT_FINI(osp, struct osp_thread_info);
1177 static void osp_key_exit(const struct lu_context *ctx,
1178                          struct lu_context_key *key, void *data)
1179 {
1180         struct osp_thread_info *info = data;
1181
1182         info->osi_attr.la_valid = 0;
1183 }
1184
1185 struct lu_context_key osp_thread_key = {
1186         .lct_tags = LCT_MD_THREAD,
1187         .lct_init = osp_key_init,
1188         .lct_fini = osp_key_fini,
1189         .lct_exit = osp_key_exit
1190 };
1191
1192 /* context key constructor/destructor: mdt_txn_key_init, mdt_txn_key_fini */
1193 LU_KEY_INIT_FINI(osp_txn, struct osp_txn_info);
1194
1195 struct lu_context_key osp_txn_key = {
1196         .lct_tags = LCT_OSP_THREAD | LCT_TX_HANDLE,
1197         .lct_init = osp_txn_key_init,
1198         .lct_fini = osp_txn_key_fini
1199 };
1200 LU_TYPE_INIT_FINI(osp, &osp_thread_key, &osp_txn_key);
1201
1202 static struct lu_device_type_operations osp_device_type_ops = {
1203         .ldto_init           = osp_type_init,
1204         .ldto_fini           = osp_type_fini,
1205
1206         .ldto_start          = osp_type_start,
1207         .ldto_stop           = osp_type_stop,
1208
1209         .ldto_device_alloc   = osp_device_alloc,
1210         .ldto_device_free    = osp_device_free,
1211
1212         .ldto_device_fini    = osp_device_fini
1213 };
1214
1215 static struct lu_device_type osp_device_type = {
1216         .ldt_tags     = LU_DEVICE_DT,
1217         .ldt_name     = LUSTRE_OSP_NAME,
1218         .ldt_ops      = &osp_device_type_ops,
1219         .ldt_ctx_tags = LCT_MD_THREAD | LCT_DT_THREAD,
1220 };
1221
1222 static struct obd_ops osp_obd_device_ops = {
1223         .o_owner        = THIS_MODULE,
1224         .o_add_conn     = client_import_add_conn,
1225         .o_del_conn     = client_import_del_conn,
1226         .o_reconnect    = osp_reconnect,
1227         .o_connect      = osp_obd_connect,
1228         .o_disconnect   = osp_obd_disconnect,
1229         .o_get_info     = osp_obd_get_info,
1230         .o_import_event = osp_import_event,
1231         .o_iocontrol    = osp_iocontrol,
1232         .o_statfs       = osp_obd_statfs,
1233         .o_fid_init     = client_fid_init,
1234         .o_fid_fini     = client_fid_fini,
1235         .o_fid_alloc    = osp_fid_alloc,
1236 };
1237
1238 struct llog_operations osp_mds_ost_orig_logops;
1239
1240 static int __init osp_mod_init(void)
1241 {
1242         struct obd_type *type;
1243         int rc;
1244
1245         rc = lu_kmem_init(osp_caches);
1246         if (rc)
1247                 return rc;
1248
1249
1250         rc = class_register_type(&osp_obd_device_ops, NULL, true, NULL,
1251 #ifndef HAVE_ONLY_PROCFS_SEQ
1252                                  NULL,
1253 #endif
1254                                  LUSTRE_OSP_NAME, &osp_device_type);
1255         if (rc != 0) {
1256                 lu_kmem_fini(osp_caches);
1257                 return rc;
1258         }
1259
1260         rc = class_register_type(&lwp_obd_device_ops, NULL, true, NULL,
1261 #ifndef HAVE_ONLY_PROCFS_SEQ
1262                                  NULL,
1263 #endif
1264                                  LUSTRE_LWP_NAME, &lwp_device_type);
1265         if (rc != 0) {
1266                 class_unregister_type(LUSTRE_OSP_NAME);
1267                 lu_kmem_fini(osp_caches);
1268                 return rc;
1269         }
1270
1271         /* Note: add_rec/delcare_add_rec will be only used by catalogs */
1272         osp_mds_ost_orig_logops = llog_osd_ops;
1273         osp_mds_ost_orig_logops.lop_add = llog_cat_add_rec;
1274         osp_mds_ost_orig_logops.lop_declare_add = llog_cat_declare_add_rec;
1275
1276         /* create "osc" entry in procfs for compatibility purposes */
1277         type = class_search_type(LUSTRE_OSC_NAME);
1278         if (type != NULL && type->typ_procroot != NULL)
1279                 return rc;
1280
1281         type = class_search_type(LUSTRE_OSP_NAME);
1282         type->typ_procsym = lprocfs_seq_register("osc", proc_lustre_root,
1283                                                  NULL, NULL);
1284         if (IS_ERR(type->typ_procsym)) {
1285                 CERROR("osp: can't create compat entry \"osc\": %d\n",
1286                        (int) PTR_ERR(type->typ_procsym));
1287                 type->typ_procsym = NULL;
1288         }
1289         return rc;
1290 }
1291
1292 static void __exit osp_mod_exit(void)
1293 {
1294         class_unregister_type(LUSTRE_LWP_NAME);
1295         class_unregister_type(LUSTRE_OSP_NAME);
1296         lu_kmem_fini(osp_caches);
1297 }
1298
1299 MODULE_AUTHOR("Intel, Inc. <http://www.intel.com/>");
1300 MODULE_DESCRIPTION("Lustre OST Proxy Device ("LUSTRE_OSP_NAME")");
1301 MODULE_LICENSE("GPL");
1302
1303 cfs_module(osp, LUSTRE_VERSION_STRING, osp_mod_init, osp_mod_exit);