lustre/obdclass/local_storage.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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2012 Whamcloud, Inc.
  24  */
  25 /*
  26  * lustre/obdclass/local_storage.c
  27  *
  28  * Local storage for file/objects with fid generation. Works on top of OSD.
  29  *
  30  * Author: Mikhail Pershin <mike.pershin@intel.com>
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_CLASS
  34
  35 #include "local_storage.h"
  36
  37 /* all initialized local storages on this node are linked on this */
  38 static CFS_LIST_HEAD(ls_list_head);
  39 static CFS_DEFINE_MUTEX(ls_list_mutex);
  40
  41 static int ls_object_init(const struct lu_env *env, struct lu_object *o,
  42                           const struct lu_object_conf *unused)
  43 {
  44         struct ls_device        *ls;
  45         struct lu_object        *below;
  46         struct lu_device        *under;
  47
  48         ENTRY;
  49
  50         ls = container_of0(o->lo_dev, struct ls_device, ls_top_dev.dd_lu_dev);
  51         under = &ls->ls_osd->dd_lu_dev;
  52         below = under->ld_ops->ldo_object_alloc(env, o->lo_header, under);
  53         if (below == NULL)
  54                 RETURN(-ENOMEM);
  55
  56         lu_object_add(o, below);
  57
  58         RETURN(0);
  59 }
  60
  61 static void ls_object_free(const struct lu_env *env, struct lu_object *o)
  62 {
  63         struct ls_object        *obj = lu2ls_obj(o);
  64         struct lu_object_header *h = o->lo_header;
  65
  66         dt_object_fini(&obj->ls_obj);
  67         lu_object_header_fini(h);
  68         OBD_FREE_PTR(obj);
  69 }
  70
  71 struct lu_object_operations ls_lu_obj_ops = {
  72         .loo_object_init  = ls_object_init,
  73         .loo_object_free  = ls_object_free,
  74 };
  75
  76 struct lu_object *ls_object_alloc(const struct lu_env *env,
  77                                   const struct lu_object_header *_h,
  78                                   struct lu_device *d)
  79 {
  80         struct lu_object_header *h;
  81         struct ls_object        *o;
  82         struct lu_object        *l;
  83
  84         LASSERT(_h == NULL);
  85
  86         OBD_ALLOC_PTR(o);
  87         if (o != NULL) {
  88                 l = &o->ls_obj.do_lu;
  89                 h = &o->ls_header;
  90
  91                 lu_object_header_init(h);
  92                 dt_object_init(&o->ls_obj, h, d);
  93                 lu_object_add_top(h, l);
  94
  95                 l->lo_ops = &ls_lu_obj_ops;
  96
  97                 return l;
  98         } else {
  99                 return NULL;
 100         }
 101 }
 102
 103 static struct lu_device_operations ls_lu_dev_ops = {
 104         .ldo_object_alloc =     ls_object_alloc
 105 };
 106
 107 static struct ls_device *__ls_find_dev(struct dt_device *dev)
 108 {
 109         struct ls_device *ls, *ret = NULL;
 110
 111         cfs_list_for_each_entry(ls, &ls_list_head, ls_linkage) {
 112                 if (ls->ls_osd == dev) {
 113                         cfs_atomic_inc(&ls->ls_refcount);
 114                         ret = ls;
 115                         break;
 116                 }
 117         }
 118         return ret;
 119 }
 120
 121 struct ls_device *ls_find_dev(struct dt_device *dev)
 122 {
 123         struct ls_device *ls;
 124
 125         cfs_mutex_lock(&ls_list_mutex);
 126         ls = __ls_find_dev(dev);
 127         cfs_mutex_unlock(&ls_list_mutex);
 128
 129         return ls;
 130 }
 131
 132 static struct lu_device_type_operations ls_device_type_ops = {
 133         .ldto_start = NULL,
 134         .ldto_stop  = NULL,
 135 };
 136
 137 static struct lu_device_type ls_lu_type = {
 138         .ldt_name = "local_storage",
 139         .ldt_ops  = &ls_device_type_ops,
 140 };
 141
 142 struct ls_device *ls_device_get(struct dt_device *dev)
 143 {
 144         struct ls_device *ls;
 145
 146         ENTRY;
 147
 148         cfs_mutex_lock(&ls_list_mutex);
 149         ls = __ls_find_dev(dev);
 150         if (ls)
 151                 GOTO(out_ls, ls);
 152
 153         /* not found, then create */
 154         OBD_ALLOC_PTR(ls);
 155         if (ls == NULL)
 156                 GOTO(out_ls, ls = ERR_PTR(-ENOMEM));
 157
 158         cfs_atomic_set(&ls->ls_refcount, 1);
 159         CFS_INIT_LIST_HEAD(&ls->ls_los_list);
 160         cfs_mutex_init(&ls->ls_los_mutex);
 161
 162         ls->ls_osd = dev;
 163
 164         LASSERT(dev->dd_lu_dev.ld_site);
 165         lu_device_init(&ls->ls_top_dev.dd_lu_dev, &ls_lu_type);
 166         ls->ls_top_dev.dd_lu_dev.ld_ops = &ls_lu_dev_ops;
 167         ls->ls_top_dev.dd_lu_dev.ld_site = dev->dd_lu_dev.ld_site;
 168
 169         /* finally add ls to the list */
 170         cfs_list_add(&ls->ls_linkage, &ls_list_head);
 171 out_ls:
 172         cfs_mutex_unlock(&ls_list_mutex);
 173         RETURN(ls);
 174 }
 175
 176 void ls_device_put(const struct lu_env *env, struct ls_device *ls)
 177 {
 178         LASSERT(env);
 179         if (!cfs_atomic_dec_and_test(&ls->ls_refcount))
 180                 return;
 181
 182         cfs_mutex_lock(&ls_list_mutex);
 183         if (cfs_atomic_read(&ls->ls_refcount) == 0) {
 184                 LASSERT(cfs_list_empty(&ls->ls_los_list));
 185                 cfs_list_del(&ls->ls_linkage);
 186                 lu_site_purge(env, ls->ls_top_dev.dd_lu_dev.ld_site, ~0);
 187                 lu_device_fini(&ls->ls_top_dev.dd_lu_dev);
 188                 OBD_FREE_PTR(ls);
 189         }
 190         cfs_mutex_unlock(&ls_list_mutex);
 191 }
 192
 193 /**
 194  * local file fid generation
 195  */
 196 int local_object_fid_generate(const struct lu_env *env,
 197                               struct local_oid_storage *los,
 198                               struct lu_fid *fid)
 199 {
 200         LASSERT(los->los_dev);
 201         LASSERT(los->los_obj);
 202
 203         /* take next OID */
 204
 205         /* to make it unique after reboot we store
 206          * the latest generated fid atomically with
 207          * object creation see local_object_create() */
 208
 209         cfs_mutex_lock(&los->los_id_lock);
 210         fid->f_seq = los->los_seq;
 211         fid->f_oid = los->los_last_oid++;
 212         fid->f_ver = 0;
 213         cfs_mutex_unlock(&los->los_id_lock);
 214
 215         return 0;
 216 }
 217
 218 int local_object_declare_create(const struct lu_env *env,
 219                                 struct local_oid_storage *los,
 220                                 struct dt_object *o, struct lu_attr *attr,
 221                                 struct dt_object_format *dof,
 222                                 struct thandle *th)
 223 {
 224         struct dt_thread_info   *dti = dt_info(env);
 225         int                      rc;
 226
 227         ENTRY;
 228
 229         /* update fid generation file */
 230         if (los != NULL) {
 231                 LASSERT(dt_object_exists(los->los_obj));
 232                 rc = dt_declare_record_write(env, los->los_obj,
 233                                              sizeof(struct los_ondisk), 0, th);
 234                 if (rc)
 235                         RETURN(rc);
 236         }
 237
 238         rc = dt_declare_create(env, o, attr, NULL, dof, th);
 239         if (rc)
 240                 RETURN(rc);
 241
 242         dti->dti_lb.lb_buf = NULL;
 243         dti->dti_lb.lb_len = sizeof(dti->dti_lma);
 244         rc = dt_declare_xattr_set(env, o, &dti->dti_lb, XATTR_NAME_LMA, 0, th);
 245
 246         RETURN(rc);
 247 }
 248
 249 int local_object_create(const struct lu_env *env,
 250                         struct local_oid_storage *los,
 251                         struct dt_object *o, struct lu_attr *attr,
 252                         struct dt_object_format *dof, struct thandle *th)
 253 {
 254         struct dt_thread_info   *dti = dt_info(env);
 255         struct los_ondisk        losd;
 256         int                      rc;
 257
 258         ENTRY;
 259
 260         rc = dt_create(env, o, attr, NULL, dof, th);
 261         if (rc)
 262                 RETURN(rc);
 263
 264         lustre_lma_init(&dti->dti_lma, lu_object_fid(&o->do_lu));
 265         lustre_lma_swab(&dti->dti_lma);
 266         dti->dti_lb.lb_buf = &dti->dti_lma;
 267         dti->dti_lb.lb_len = sizeof(dti->dti_lma);
 268         rc = dt_xattr_set(env, o, &dti->dti_lb, XATTR_NAME_LMA, 0, th,
 269                           BYPASS_CAPA);
 270
 271         if (los == NULL)
 272                 RETURN(rc);
 273
 274         LASSERT(los->los_obj);
 275         LASSERT(dt_object_exists(los->los_obj));
 276
 277         /* many threads can be updated this, serialize
 278          * them here to avoid the race where one thread
 279          * takes the value first, but writes it last */
 280         cfs_mutex_lock(&los->los_id_lock);
 281
 282         /* update local oid number on disk so that
 283          * we know the last one used after reboot */
 284         losd.lso_magic = cpu_to_le32(LOS_MAGIC);
 285         losd.lso_next_oid = cpu_to_le32(los->los_last_oid);
 286
 287         dti->dti_off = 0;
 288         dti->dti_lb.lb_buf = &losd;
 289         dti->dti_lb.lb_len = sizeof(losd);
 290         rc = dt_record_write(env, los->los_obj, &dti->dti_lb, &dti->dti_off,
 291                              th);
 292         cfs_mutex_unlock(&los->los_id_lock);
 293
 294         RETURN(rc);
 295 }
 296
 297 /*
 298  * Create local named object (file, directory or index) in parent directory.
 299  */
 300 struct dt_object *__local_file_create(const struct lu_env *env,
 301                                       const struct lu_fid *fid,
 302                                       struct local_oid_storage *los,
 303                                       struct ls_device *ls,
 304                                       struct dt_object *parent,
 305                                       const char *name, struct lu_attr *attr,
 306                                       struct dt_object_format *dof)
 307 {
 308         struct dt_thread_info   *dti = dt_info(env);
 309         struct dt_object        *dto;
 310         struct thandle          *th;
 311         int                      rc;
 312
 313         dto = ls_locate(env, ls, fid);
 314         if (unlikely(IS_ERR(dto)))
 315                 RETURN(dto);
 316
 317         LASSERT(dto != NULL);
 318         if (dt_object_exists(dto))
 319                 GOTO(out, rc = -EEXIST);
 320
 321         th = dt_trans_create(env, ls->ls_osd);
 322         if (IS_ERR(th))
 323                 GOTO(out, rc = PTR_ERR(th));
 324
 325         rc = local_object_declare_create(env, los, dto, attr, dof, th);
 326         if (rc)
 327                 GOTO(trans_stop, rc);
 328
 329         if (dti->dti_dof.dof_type == DFT_DIR) {
 330                 dt_declare_ref_add(env, dto, th);
 331                 dt_declare_ref_add(env, parent, th);
 332         }
 333
 334         rc = dt_declare_insert(env, parent, (void *)fid, (void *)name, th);
 335         if (rc)
 336                 GOTO(trans_stop, rc);
 337
 338         rc = dt_trans_start_local(env, ls->ls_osd, th);
 339         if (rc)
 340                 GOTO(trans_stop, rc);
 341
 342         dt_write_lock(env, dto, 0);
 343         if (dt_object_exists(dto))
 344                 GOTO(unlock, rc = 0);
 345
 346         CDEBUG(D_OTHER, "create new object "DFID"\n",
 347                PFID(lu_object_fid(&dto->do_lu)));
 348         rc = local_object_create(env, los, dto, attr, dof, th);
 349         if (rc)
 350                 GOTO(unlock, rc);
 351         LASSERT(dt_object_exists(dto));
 352
 353         if (dti->dti_dof.dof_type == DFT_DIR) {
 354                 if (!dt_try_as_dir(env, dto))
 355                         GOTO(destroy, rc = -ENOTDIR);
 356                 /* Add "." and ".." for newly created dir */
 357                 rc = dt_insert(env, dto, (void *)fid, (void *)".", th,
 358                                BYPASS_CAPA, 1);
 359                 if (rc)
 360                         GOTO(destroy, rc);
 361                 dt_ref_add(env, dto, th);
 362                 rc = dt_insert(env, dto, (void *)lu_object_fid(&parent->do_lu),
 363                                (void *)"..", th, BYPASS_CAPA, 1);
 364                 if (rc)
 365                         GOTO(destroy, rc);
 366         }
 367
 368         dt_write_lock(env, parent, 0);
 369         rc = dt_insert(env, parent, (const struct dt_rec *)fid,
 370                        (const struct dt_key *)name, th, BYPASS_CAPA, 1);
 371         if (dti->dti_dof.dof_type == DFT_DIR)
 372                 dt_ref_add(env, parent, th);
 373         dt_write_unlock(env, parent);
 374         if (rc)
 375                 GOTO(destroy, rc);
 376 destroy:
 377         if (rc)
 378                 dt_destroy(env, dto, th);
 379 unlock:
 380         dt_write_unlock(env, dto);
 381 trans_stop:
 382         dt_trans_stop(env, ls->ls_osd, th);
 383 out:
 384         if (rc) {
 385                 lu_object_put_nocache(env, &dto->do_lu);
 386                 dto = ERR_PTR(rc);
 387         } else {
 388                 struct lu_fid dti_fid;
 389                 /* since local files FIDs are not in OI the directory entry
 390                  * is used to get inode number/generation, we need to do lookup
 391                  * again to cache this data after create */
 392                 rc = dt_lookup_dir(env, parent, name, &dti_fid);
 393                 LASSERT(rc == 0);
 394         }
 395         RETURN(dto);
 396 }
 397
 398 /*
 399  * Look up and create (if it does not exist) a local named file or directory in
 400  * parent directory.
 401  */
 402 struct dt_object *local_file_find_or_create(const struct lu_env *env,
 403                                             struct local_oid_storage *los,
 404                                             struct dt_object *parent,
 405                                             const char *name, __u32 mode)
 406 {
 407         struct dt_thread_info   *dti = dt_info(env);
 408         struct dt_object        *dto;
 409         int                      rc;
 410
 411         LASSERT(parent);
 412
 413         rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
 414         if (rc == 0)
 415                 /* name is found, get the object */
 416                 dto = ls_locate(env, dt2ls_dev(los->los_dev), &dti->dti_fid);
 417         else if (rc != -ENOENT)
 418                 dto = ERR_PTR(rc);
 419         else {
 420                 rc = local_object_fid_generate(env, los, &dti->dti_fid);
 421                 if (rc < 0) {
 422                         dto = ERR_PTR(rc);
 423                 } else {
 424                         /* create the object */
 425                         dti->dti_attr.la_valid  = LA_MODE;
 426                         dti->dti_attr.la_mode   = mode;
 427                         dti->dti_dof.dof_type   = dt_mode_to_dft(mode & S_IFMT);
 428                         dto = __local_file_create(env, &dti->dti_fid, los,
 429                                                   dt2ls_dev(los->los_dev),
 430                                                   parent, name, &dti->dti_attr,
 431                                                   &dti->dti_dof);
 432                 }
 433         }
 434         return dto;
 435 }
 436 EXPORT_SYMBOL(local_file_find_or_create);
 437
 438 struct dt_object *local_file_find_or_create_with_fid(const struct lu_env *env,
 439                                                      struct dt_device *dt,
 440                                                      const struct lu_fid *fid,
 441                                                      struct dt_object *parent,
 442                                                      const char *name,
 443                                                      __u32 mode)
 444 {
 445         struct dt_thread_info   *dti = dt_info(env);
 446         struct dt_object        *dto;
 447         int                      rc;
 448
 449         LASSERT(parent);
 450
 451         rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
 452         if (rc == 0) {
 453                 /* name is found, get the object */
 454                 if (!lu_fid_eq(fid, &dti->dti_fid))
 455                         dto = ERR_PTR(-EINVAL);
 456                 else
 457                         dto = dt_locate(env, dt, fid);
 458         } else if (rc != -ENOENT) {
 459                 dto = ERR_PTR(rc);
 460         } else {
 461                 struct ls_device *ls;
 462
 463                 ls = ls_device_get(dt);
 464                 if (IS_ERR(ls)) {
 465                         dto = ERR_PTR(PTR_ERR(ls));
 466                 } else {
 467                         /* create the object */
 468                         dti->dti_attr.la_valid  = LA_MODE;
 469                         dti->dti_attr.la_mode   = mode;
 470                         dti->dti_dof.dof_type   = dt_mode_to_dft(mode & S_IFMT);
 471                         dto = __local_file_create(env, fid, NULL, ls, parent,
 472                                                   name, &dti->dti_attr,
 473                                                   &dti->dti_dof);
 474                         /* ls_device_put() will finalize the ls device, we
 475                          * have to open the object in other device stack */
 476                         if (!IS_ERR(dto)) {
 477                                 dti->dti_fid = dto->do_lu.lo_header->loh_fid;
 478                                 lu_object_put_nocache(env, &dto->do_lu);
 479                                 dto = dt_locate(env, dt, &dti->dti_fid);
 480                         }
 481                         ls_device_put(env, ls);
 482                 }
 483         }
 484         return dto;
 485 }
 486 EXPORT_SYMBOL(local_file_find_or_create_with_fid);
 487
 488 /*
 489  * Look up and create (if it does not exist) a local named index file in parent
 490  * directory.
 491  */
 492 struct dt_object *local_index_find_or_create(const struct lu_env *env,
 493                                              struct local_oid_storage *los,
 494                                              struct dt_object *parent,
 495                                              const char *name, __u32 mode,
 496                                              const struct dt_index_features *ft)
 497 {
 498         struct dt_thread_info   *dti = dt_info(env);
 499         struct dt_object        *dto;
 500         int                      rc;
 501
 502         LASSERT(parent);
 503
 504         rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
 505         if (rc == 0) {
 506                 /* name is found, get the object */
 507                 dto = ls_locate(env, dt2ls_dev(los->los_dev), &dti->dti_fid);
 508         } else if (rc != -ENOENT) {
 509                 dto = ERR_PTR(rc);
 510         } else {
 511                 rc = local_object_fid_generate(env, los, &dti->dti_fid);
 512                 if (rc < 0) {
 513                         dto = ERR_PTR(rc);
 514                 } else {
 515                         /* create the object */
 516                         dti->dti_attr.la_valid          = LA_MODE;
 517                         dti->dti_attr.la_mode           = mode;
 518                         dti->dti_dof.dof_type           = DFT_INDEX;
 519                         dti->dti_dof.u.dof_idx.di_feat  = ft;
 520                         dto = __local_file_create(env, &dti->dti_fid, los,
 521                                                   dt2ls_dev(los->los_dev),
 522                                                   parent, name, &dti->dti_attr,
 523                                                   &dti->dti_dof);
 524                 }
 525         }
 526         return dto;
 527
 528 }
 529 EXPORT_SYMBOL(local_index_find_or_create);
 530
 531 struct dt_object *
 532 local_index_find_or_create_with_fid(const struct lu_env *env,
 533                                     struct dt_device *dt,
 534                                     const struct lu_fid *fid,
 535                                     struct dt_object *parent,
 536                                     const char *name, __u32 mode,
 537                                     const struct dt_index_features *ft)
 538 {
 539         struct dt_thread_info   *dti = dt_info(env);
 540         struct dt_object        *dto;
 541         int                      rc;
 542
 543         LASSERT(parent);
 544
 545         rc = dt_lookup_dir(env, parent, name, &dti->dti_fid);
 546         if (rc == 0) {
 547                 /* name is found, get the object */
 548                 if (!lu_fid_eq(fid, &dti->dti_fid))
 549                         dto = ERR_PTR(-EINVAL);
 550                 else
 551                         dto = dt_locate(env, dt, fid);
 552         } else if (rc != -ENOENT) {
 553                 dto = ERR_PTR(rc);
 554         } else {
 555                 struct ls_device *ls;
 556
 557                 ls = ls_device_get(dt);
 558                 if (IS_ERR(ls)) {
 559                         dto = ERR_PTR(PTR_ERR(ls));
 560                 } else {
 561                         /* create the object */
 562                         dti->dti_attr.la_valid          = LA_MODE;
 563                         dti->dti_attr.la_mode           = mode;
 564                         dti->dti_dof.dof_type           = DFT_INDEX;
 565                         dti->dti_dof.u.dof_idx.di_feat  = ft;
 566                         dto = __local_file_create(env, fid, NULL, ls, parent,
 567                                                   name, &dti->dti_attr,
 568                                                   &dti->dti_dof);
 569                         /* ls_device_put() will finalize the ls device, we
 570                          * have to open the object in other device stack */
 571                         if (!IS_ERR(dto)) {
 572                                 dti->dti_fid = dto->do_lu.lo_header->loh_fid;
 573                                 lu_object_put_nocache(env, &dto->do_lu);
 574                                 dto = dt_locate(env, dt, &dti->dti_fid);
 575                         }
 576                         ls_device_put(env, ls);
 577                 }
 578         }
 579         return dto;
 580 }
 581 EXPORT_SYMBOL(local_index_find_or_create_with_fid);
 582
 583 struct local_oid_storage *dt_los_find(struct ls_device *ls, __u64 seq)
 584 {
 585         struct local_oid_storage *los, *ret = NULL;
 586
 587         cfs_list_for_each_entry(los, &ls->ls_los_list, los_list) {
 588                 if (los->los_seq == seq) {
 589                         cfs_atomic_inc(&los->los_refcount);
 590                         ret = los;
 591                         break;
 592                 }
 593         }
 594         return ret;
 595 }
 596
 597 void dt_los_put(struct local_oid_storage *los)
 598 {
 599         if (cfs_atomic_dec_and_test(&los->los_refcount))
 600                 /* should never happen, only local_oid_storage_fini should
 601                  * drop refcount to zero */
 602                 LBUG();
 603         return;
 604 }
 605
 606 /**
 607  * Initialize local OID storage for required sequence.
 608  * That may be needed for services that uses local files and requires
 609  * dynamic OID allocation for them.
 610  *
 611  * Per each sequence we have an object with 'first_fid' identificator
 612  * containing the counter for OIDs of locally created files with that
 613  * sequence.
 614  *
 615  * It is used now by llog subsystem and MGS for NID tables
 616  *
 617  * Function gets first_fid to create counter object.
 618  * All dynamic fids will be generated with the same sequence and incremented
 619  * OIDs
 620  *
 621  * Returned local_oid_storage is in-memory representaion of OID storage
 622  */
 623 int local_oid_storage_init(const struct lu_env *env, struct dt_device *dev,
 624                            const struct lu_fid *first_fid,
 625                            struct local_oid_storage **los)
 626 {
 627         struct dt_thread_info   *dti = dt_info(env);
 628         struct ls_device        *ls;
 629         struct los_ondisk        losd;
 630         struct dt_object        *o;
 631         struct dt_object        *root = NULL;
 632         struct thandle          *th;
 633         int                      rc;
 634
 635         ENTRY;
 636
 637         ls = ls_device_get(dev);
 638         if (IS_ERR(ls))
 639                 RETURN(PTR_ERR(ls));
 640
 641         cfs_mutex_lock(&ls->ls_los_mutex);
 642         *los = dt_los_find(ls, fid_seq(first_fid));
 643         if (*los != NULL)
 644                 GOTO(out, rc = 0);
 645
 646         /* not found, then create */
 647         OBD_ALLOC_PTR(*los);
 648         if (*los == NULL)
 649                 GOTO(out, rc = -ENOMEM);
 650
 651         cfs_atomic_set(&(*los)->los_refcount, 1);
 652         cfs_mutex_init(&(*los)->los_id_lock);
 653         (*los)->los_dev = &ls->ls_top_dev;
 654         cfs_atomic_inc(&ls->ls_refcount);
 655         cfs_list_add(&(*los)->los_list, &ls->ls_los_list);
 656
 657         /* initialize data allowing to generate new fids,
 658          * literally we need a sequence */
 659         o = ls_locate(env, ls, first_fid);
 660         if (IS_ERR(o))
 661                 GOTO(out_los, rc = PTR_ERR(o));
 662
 663         rc = dt_root_get(env, dev, &dti->dti_fid);
 664         if (rc)
 665                 GOTO(out_los, rc);
 666
 667         root = ls_locate(env, ls, &dti->dti_fid);
 668         if (IS_ERR(root))
 669                 GOTO(out_los, rc = PTR_ERR(root));
 670
 671         if (dt_try_as_dir(env, root) == 0)
 672                 GOTO(out_los, rc = -ENOTDIR);
 673
 674         dt_write_lock(env, o, 0);
 675         if (!dt_object_exists(o)) {
 676                 th = dt_trans_create(env, dev);
 677                 if (IS_ERR(th))
 678                         GOTO(out_lock, rc = PTR_ERR(th));
 679
 680                 dti->dti_attr.la_valid = LA_MODE | LA_TYPE;
 681                 dti->dti_attr.la_mode = S_IFREG | S_IRUGO | S_IWUSR;
 682                 dti->dti_dof.dof_type = dt_mode_to_dft(S_IFREG);
 683
 684                 rc = dt_declare_create(env, o, &dti->dti_attr, NULL,
 685                                        &dti->dti_dof, th);
 686                 if (rc)
 687                         GOTO(out_trans, rc);
 688
 689                 snprintf(dti->dti_buf, sizeof(dti->dti_buf),
 690                         "seq-%Lx-lastid", fid_seq(first_fid));
 691                 rc = dt_declare_insert(env, root,
 692                                        (const struct dt_rec *)lu_object_fid(&o->do_lu),
 693                                        (const struct dt_key *)dti->dti_buf,
 694                                        th);
 695                 if (rc)
 696                         GOTO(out_trans, rc);
 697
 698                 dti->dti_lb.lb_buf = NULL;
 699                 dti->dti_lb.lb_len = sizeof(dti->dti_lma);
 700                 rc = dt_declare_xattr_set(env, o, &dti->dti_lb, XATTR_NAME_LMA,
 701                                           0, th);
 702                 if (rc)
 703                         GOTO(out_trans, rc);
 704
 705                 rc = dt_declare_record_write(env, o, sizeof(losd), 0, th);
 706                 if (rc)
 707                         GOTO(out_trans, rc);
 708
 709                 rc = dt_trans_start_local(env, dev, th);
 710                 if (rc)
 711                         GOTO(out_trans, rc);
 712
 713                 LASSERT(!dt_object_exists(o));
 714                 rc = dt_create(env, o, &dti->dti_attr, NULL, &dti->dti_dof, th);
 715                 if (rc)
 716                         GOTO(out_trans, rc);
 717                 LASSERT(dt_object_exists(o));
 718
 719                 lustre_lma_init(&dti->dti_lma, lu_object_fid(&o->do_lu));
 720                 lustre_lma_swab(&dti->dti_lma);
 721                 dti->dti_lb.lb_buf = &dti->dti_lma;
 722                 dti->dti_lb.lb_len = sizeof(dti->dti_lma);
 723                 rc = dt_xattr_set(env, o, &dti->dti_lb, XATTR_NAME_LMA, 0,
 724                                   th, BYPASS_CAPA);
 725                 if (rc)
 726                         GOTO(out_trans, rc);
 727
 728                 losd.lso_magic = cpu_to_le32(LOS_MAGIC);
 729                 losd.lso_next_oid = cpu_to_le32(fid_oid(first_fid) + 1);
 730
 731                 dti->dti_off = 0;
 732                 dti->dti_lb.lb_buf = &losd;
 733                 dti->dti_lb.lb_len = sizeof(losd);
 734                 rc = dt_record_write(env, o, &dti->dti_lb, &dti->dti_off, th);
 735                 if (rc)
 736                         GOTO(out_trans, rc);
 737 #if LUSTRE_VERSION_CODE >= OBD_OCD_VERSION(2, 3, 90, 0)
 738 #error "fix this before release"
 739 #endif
 740                 /*
 741                  * there is one technical debt left in Orion:
 742                  * proper hanlding of named vs no-name objects.
 743                  * Llog objects have name always as they are placed in O/d/...
 744                  */
 745                 if (fid_seq(lu_object_fid(&o->do_lu)) != FID_SEQ_LLOG) {
 746                         rc = dt_insert(env, root,
 747                                        (const struct dt_rec *)first_fid,
 748                                        (const struct dt_key *)dti->dti_buf,
 749                                        th, BYPASS_CAPA, 1);
 750                         if (rc)
 751                                 GOTO(out_trans, rc);
 752                 }
 753 out_trans:
 754                 dt_trans_stop(env, dev, th);
 755         } else {
 756                 dti->dti_off = 0;
 757                 dti->dti_lb.lb_buf = &losd;
 758                 dti->dti_lb.lb_len = sizeof(losd);
 759                 rc = dt_record_read(env, o, &dti->dti_lb, &dti->dti_off);
 760                 if (rc == 0 && le32_to_cpu(losd.lso_magic) != LOS_MAGIC) {
 761                         CERROR("local storage file "DFID" is corrupted\n",
 762                                PFID(first_fid));
 763                         rc = -EINVAL;
 764                 }
 765         }
 766 out_lock:
 767         dt_write_unlock(env, o);
 768 out_los:
 769         if (root)
 770                 lu_object_put_nocache(env, &root->do_lu);
 771         if (rc) {
 772                 OBD_FREE_PTR(*los);
 773                 *los = NULL;
 774                 if (o)
 775                         lu_object_put_nocache(env, &o->do_lu);
 776         } else {
 777                 (*los)->los_seq = fid_seq(first_fid);
 778                 (*los)->los_last_oid = le32_to_cpu(losd.lso_next_oid);
 779                 (*los)->los_obj = o;
 780         }
 781 out:
 782         cfs_mutex_unlock(&ls->ls_los_mutex);
 783         ls_device_put(env, ls);
 784         return rc;
 785 }
 786 EXPORT_SYMBOL(local_oid_storage_init);
 787
 788 void local_oid_storage_fini(const struct lu_env *env,
 789                             struct local_oid_storage *los)
 790 {
 791         struct ls_device *ls;
 792
 793         if (!cfs_atomic_dec_and_test(&los->los_refcount))
 794                 return;
 795
 796         LASSERT(env);
 797         LASSERT(los->los_dev);
 798         ls = dt2ls_dev(los->los_dev);
 799
 800         cfs_mutex_lock(&ls->ls_los_mutex);
 801         if (cfs_atomic_read(&los->los_refcount) == 0) {
 802                 if (los->los_obj)
 803                         lu_object_put_nocache(env, &los->los_obj->do_lu);
 804                 cfs_list_del(&los->los_list);
 805                 OBD_FREE_PTR(los);
 806         }
 807         cfs_mutex_unlock(&ls->ls_los_mutex);
 808         ls_device_put(env, ls);
 809 }
 810 EXPORT_SYMBOL(local_oid_storage_fini);