lustre/lod/lod_lov.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  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright  2009 Sun Microsystems, Inc. All rights reserved
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * lustre/lod/lod_lov.c
  30  *
  31  * A set of helpers to maintain Logical Object Volume (LOV)
  32  * Extended Attribute (EA) and known OST targets
  33  *
  34  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_MDS
  38
  39 #include <obd_class.h>
  40 #include <lustre_lfsck.h>
  41 #include <lustre_lmv.h>
  42 #include <lustre_swab.h>
  43
  44 #include "lod_internal.h"
  45
  46 /**
  47  * Increase reference count on the target table.
  48  *
  49  * Increase reference count on the target table usage to prevent racing with
  50  * addition/deletion. Any function that expects the table to remain
  51  * stationary must take a ref.
  52  *
  53  * \param[in] ltd       target table (lod_ost_descs or lod_mdt_descs)
  54  */
  55 void lod_getref(struct lod_tgt_descs *ltd)
  56 {
  57         down_read(&ltd->ltd_rw_sem);
  58         mutex_lock(&ltd->ltd_mutex);
  59         ltd->ltd_refcount++;
  60         mutex_unlock(&ltd->ltd_mutex);
  61 }
  62
  63 /**
  64  * Decrease reference count on the target table.
  65  *
  66  * Companion of lod_getref() to release a reference on the target table.
  67  * If this is the last reference and the OST entry was scheduled for deletion,
  68  * the descriptor is removed from the table.
  69  *
  70  * \param[in] lod       LOD device from which we release a reference
  71  * \param[in] ltd       target table (lod_ost_descs or lod_mdt_descs)
  72  */
  73 void lod_putref(struct lod_device *lod, struct lod_tgt_descs *ltd)
  74 {
  75         mutex_lock(&ltd->ltd_mutex);
  76         ltd->ltd_refcount--;
  77         if (ltd->ltd_refcount == 0 && ltd->ltd_death_row) {
  78                 struct lod_tgt_desc *tgt_desc, *tmp;
  79                 LIST_HEAD(kill);
  80
  81                 CDEBUG(D_CONFIG, "destroying %d ltd desc\n",
  82                        ltd->ltd_death_row);
  83
  84                 ltd_foreach_tgt_safe(ltd, tgt_desc, tmp) {
  85                         LASSERT(tgt_desc);
  86                         if (!tgt_desc->ltd_reap)
  87                                 continue;
  88
  89                         list_add(&tgt_desc->ltd_kill, &kill);
  90                         lu_tgt_pool_remove(&ltd->ltd_tgt_pool,
  91                                            tgt_desc->ltd_index);
  92                         ltd_del_tgt(ltd, tgt_desc);
  93                         ltd->ltd_death_row--;
  94                 }
  95                 mutex_unlock(&ltd->ltd_mutex);
  96                 up_read(&ltd->ltd_rw_sem);
  97
  98                 list_for_each_entry_safe(tgt_desc, tmp, &kill, ltd_kill) {
  99                         int rc;
 100
 101                         list_del(&tgt_desc->ltd_kill);
 102                         rc = obd_disconnect(tgt_desc->ltd_exp);
 103                         if (rc)
 104                                 CERROR("%s: failed to disconnect %s: rc = %d\n",
 105                                        lod2obd(lod)->obd_name,
 106                                        obd_uuid2str(&tgt_desc->ltd_uuid), rc);
 107                         OBD_FREE_PTR(tgt_desc);
 108                 }
 109         } else {
 110                 mutex_unlock(&ltd->ltd_mutex);
 111                 up_read(&ltd->ltd_rw_sem);
 112         }
 113 }
 114
 115 /**
 116  * Connect LOD to a new OSP and add it to the target table.
 117  *
 118  * Connect to the OSP device passed, initialize all the internal
 119  * structures related to the device and add it to the target table.
 120  *
 121  * \param[in] env               execution environment for this thread
 122  * \param[in] lod               LOD device to be connected to the new OSP
 123  * \param[in] osp               name of OSP device name to be added
 124  * \param[in] index             index of the new target
 125  * \param[in] gen               target's generation number
 126  * \param[in] tgt_index         OSP's group
 127  * \param[in] type              type of device (mdc or osc)
 128  * \param[in] active            state of OSP: 0 - inactive, 1 - active
 129  *
 130  * \retval                      0 if added successfully
 131  * \retval                      negative error number on failure
 132  */
 133 int lod_add_device(const struct lu_env *env, struct lod_device *lod,
 134                    char *osp, unsigned index, unsigned gen, int tgt_index,
 135                    char *type, int active)
 136 {
 137         struct obd_connect_data *data = NULL;
 138         struct obd_export       *exp = NULL;
 139         struct obd_device       *obd;
 140         struct lu_device        *lu_dev;
 141         struct dt_device        *dt_dev;
 142         int                      rc;
 143         struct lod_tgt_desc     *tgt_desc;
 144         struct lod_tgt_descs    *ltd;
 145         struct lustre_cfg       *lcfg;
 146         struct obd_uuid         obd_uuid;
 147         bool                    for_ost;
 148         bool connected = false;
 149         ENTRY;
 150
 151         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, index, gen);
 152
 153         if (gen <= 0) {
 154                 CERROR("request to add OBD %s with invalid generation: %d\n",
 155                        osp, gen);
 156                 RETURN(-EINVAL);
 157         }
 158
 159         obd_str2uuid(&obd_uuid, osp);
 160
 161         obd = class_find_client_obd(&obd_uuid, LUSTRE_OSP_NAME,
 162                                 &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 163         if (obd == NULL) {
 164                 CERROR("can't find %s device\n", osp);
 165                 RETURN(-EINVAL);
 166         }
 167
 168         LASSERT(obd->obd_lu_dev != NULL);
 169         LASSERT(obd->obd_lu_dev->ld_site == lod->lod_dt_dev.dd_lu_dev.ld_site);
 170
 171         lu_dev = obd->obd_lu_dev;
 172         dt_dev = lu2dt_dev(lu_dev);
 173
 174         OBD_ALLOC_PTR(data);
 175         if (data == NULL)
 176                 GOTO(out_cleanup, rc = -ENOMEM);
 177
 178         data->ocd_connect_flags = OBD_CONNECT_INDEX | OBD_CONNECT_VERSION;
 179         data->ocd_version = LUSTRE_VERSION_CODE;
 180         data->ocd_index = index;
 181
 182         if (strcmp(LUSTRE_OSC_NAME, type) == 0) {
 183                 for_ost = true;
 184                 data->ocd_connect_flags |= OBD_CONNECT_AT |
 185                                            OBD_CONNECT_FULL20 |
 186                                            OBD_CONNECT_INDEX |
 187 #ifdef HAVE_LRU_RESIZE_SUPPORT
 188                                            OBD_CONNECT_LRU_RESIZE |
 189 #endif
 190                                            OBD_CONNECT_MDS |
 191                                            OBD_CONNECT_REQPORTAL |
 192                                            OBD_CONNECT_SKIP_ORPHAN |
 193                                            OBD_CONNECT_FID |
 194                                            OBD_CONNECT_LVB_TYPE |
 195                                            OBD_CONNECT_VERSION |
 196                                            OBD_CONNECT_PINGLESS |
 197                                            OBD_CONNECT_LFSCK |
 198                                            OBD_CONNECT_BULK_MBITS;
 199
 200                 data->ocd_group = tgt_index;
 201                 ltd = &lod->lod_ost_descs;
 202         } else {
 203                 struct obd_import *imp = obd->u.cli.cl_import;
 204
 205                 for_ost = false;
 206                 data->ocd_ibits_known = MDS_INODELOCK_UPDATE;
 207                 data->ocd_connect_flags |= OBD_CONNECT_ACL |
 208                                            OBD_CONNECT_IBITS |
 209                                            OBD_CONNECT_MDS_MDS |
 210                                            OBD_CONNECT_FID |
 211                                            OBD_CONNECT_AT |
 212                                            OBD_CONNECT_FULL20 |
 213                                            OBD_CONNECT_LFSCK |
 214                                            OBD_CONNECT_BULK_MBITS;
 215                 spin_lock(&imp->imp_lock);
 216                 imp->imp_server_timeout = 1;
 217                 spin_unlock(&imp->imp_lock);
 218                 imp->imp_client->cli_request_portal = OUT_PORTAL;
 219                 CDEBUG(D_OTHER, "%s: Set 'mds' portal and timeout\n",
 220                       obd->obd_name);
 221                 ltd = &lod->lod_mdt_descs;
 222         }
 223
 224         rc = obd_connect(env, &exp, obd, &obd->obd_uuid, data, NULL);
 225         OBD_FREE_PTR(data);
 226         if (rc) {
 227                 CERROR("%s: cannot connect to next dev %s (%d)\n",
 228                        obd->obd_name, osp, rc);
 229                 GOTO(out_cleanup, rc);
 230         }
 231         connected = true;
 232
 233         /* Allocate ost descriptor and fill it */
 234         OBD_ALLOC_PTR(tgt_desc);
 235         if (!tgt_desc)
 236                 GOTO(out_cleanup, rc = -ENOMEM);
 237
 238         tgt_desc->ltd_tgt    = dt_dev;
 239         tgt_desc->ltd_exp    = exp;
 240         tgt_desc->ltd_uuid   = obd->u.cli.cl_target_uuid;
 241         tgt_desc->ltd_gen    = gen;
 242         tgt_desc->ltd_index  = index;
 243         tgt_desc->ltd_active = active;
 244
 245         down_write(&ltd->ltd_rw_sem);
 246         mutex_lock(&ltd->ltd_mutex);
 247         rc = ltd_add_tgt(ltd, tgt_desc);
 248         if (rc)
 249                 GOTO(out_mutex, rc);
 250
 251         rc = lu_qos_add_tgt(&ltd->ltd_qos, tgt_desc);
 252         if (rc)
 253                 GOTO(out_del_tgt, rc);
 254
 255         rc = lu_tgt_pool_add(&ltd->ltd_tgt_pool, index,
 256                           ltd->ltd_lov_desc.ld_tgt_count);
 257         if (rc) {
 258                 CERROR("%s: can't set up pool, failed with %d\n",
 259                        obd->obd_name, rc);
 260                 GOTO(out_del_tgt, rc);
 261         }
 262
 263         mutex_unlock(&ltd->ltd_mutex);
 264         up_write(&ltd->ltd_rw_sem);
 265
 266         if (lod->lod_recovery_completed)
 267                 lu_dev->ld_ops->ldo_recovery_complete(env, lu_dev);
 268
 269         if (!for_ost && lod->lod_initialized) {
 270                 rc = lod_sub_init_llog(env, lod, tgt_desc->ltd_tgt);
 271                 if (rc != 0) {
 272                         CERROR("%s: cannot start llog on %s:rc = %d\n",
 273                                lod2obd(lod)->obd_name, osp, rc);
 274                         GOTO(out_ltd, rc);
 275                 }
 276         }
 277
 278         rc = lfsck_add_target(env, lod->lod_child, dt_dev, exp, index, for_ost);
 279         if (rc != 0) {
 280                 CERROR("Fail to add LFSCK target: name = %s, type = %s, "
 281                        "index = %u, rc = %d\n", osp, type, index, rc);
 282                 GOTO(out_fini_llog, rc);
 283         }
 284         RETURN(rc);
 285 out_fini_llog:
 286         lod_sub_fini_llog(env, tgt_desc->ltd_tgt,
 287                           &tgt_desc->ltd_recovery_task);
 288 out_ltd:
 289         down_write(&ltd->ltd_rw_sem);
 290         mutex_lock(&ltd->ltd_mutex);
 291         lu_tgt_pool_remove(&ltd->ltd_tgt_pool, index);
 292 out_del_tgt:
 293         ltd_del_tgt(ltd, tgt_desc);
 294 out_mutex:
 295         mutex_unlock(&ltd->ltd_mutex);
 296         up_write(&ltd->ltd_rw_sem);
 297         OBD_FREE_PTR(tgt_desc);
 298 out_cleanup:
 299         /* XXX OSP needs us to send down LCFG_CLEANUP because it uses
 300          * objects from the MDT stack. See LU-7184. */
 301         lcfg = &lod_env_info(env)->lti_lustre_cfg;
 302         memset(lcfg, 0, sizeof(*lcfg));
 303         lcfg->lcfg_version = LUSTRE_CFG_VERSION;
 304         lcfg->lcfg_command = LCFG_CLEANUP;
 305         lu_dev->ld_ops->ldo_process_config(env, lu_dev, lcfg);
 306
 307         if (connected)
 308                 obd_disconnect(exp);
 309
 310         return rc;
 311 }
 312
 313 /**
 314  * Schedule target removal from the target table.
 315  *
 316  * Mark the device as dead. The device is not removed here because it may
 317  * still be in use. The device will be removed in lod_putref() when the
 318  * last reference is released.
 319  *
 320  * \param[in] env               execution environment for this thread
 321  * \param[in] lod               LOD device the target table belongs to
 322  * \param[in] ltd               target table
 323  * \param[in] tgt               target
 324  */
 325 static void __lod_del_device(const struct lu_env *env, struct lod_device *lod,
 326                              struct lod_tgt_descs *ltd, struct lu_tgt_desc *tgt)
 327 {
 328         lfsck_del_target(env, lod->lod_child, tgt->ltd_tgt, tgt->ltd_index,
 329                          !ltd->ltd_is_mdt);
 330
 331         if (!tgt->ltd_reap) {
 332                 tgt->ltd_reap = 1;
 333                 ltd->ltd_death_row++;
 334         }
 335 }
 336
 337 /**
 338  * Schedule removal of all the targets from the given target table.
 339  *
 340  * See more details in the description for __lod_del_device()
 341  *
 342  * \param[in] env               execution environment for this thread
 343  * \param[in] lod               LOD device the target table belongs to
 344  * \param[in] ltd               target table
 345  *
 346  * \retval                      0 always
 347  */
 348 int lod_fini_tgt(const struct lu_env *env, struct lod_device *lod,
 349                  struct lod_tgt_descs *ltd)
 350 {
 351         struct lu_tgt_desc *tgt;
 352
 353         if (ltd->ltd_tgts_size <= 0)
 354                 return 0;
 355
 356         lod_getref(ltd);
 357         mutex_lock(&ltd->ltd_mutex);
 358         ltd_foreach_tgt(ltd, tgt)
 359                 __lod_del_device(env, lod, ltd, tgt);
 360         mutex_unlock(&ltd->ltd_mutex);
 361         lod_putref(lod, ltd);
 362
 363         lu_tgt_descs_fini(ltd);
 364
 365         return 0;
 366 }
 367
 368 /**
 369  * Remove device by name.
 370  *
 371  * Remove a device identified by \a osp from the target table. Given
 372  * the device can be in use, the real deletion happens in lod_putref().
 373  *
 374  * \param[in] env               execution environment for this thread
 375  * \param[in] lod               LOD device to be connected to the new OSP
 376  * \param[in] ltd               target table
 377  * \param[in] osp               name of OSP device to be removed
 378  * \param[in] idx               index of the target
 379  * \param[in] gen               generation number, not used currently
 380  *
 381  * \retval                      0 if the device was scheduled for removal
 382  * \retval                      -EINVAL if no device was found
 383  */
 384 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
 385                    struct lod_tgt_descs *ltd, char *osp, unsigned int idx,
 386                    unsigned int gen)
 387 {
 388         struct obd_device *obd;
 389         struct lu_tgt_desc *tgt;
 390         struct obd_uuid uuid;
 391         int rc = 0;
 392
 393         ENTRY;
 394
 395         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
 396
 397         obd_str2uuid(&uuid, osp);
 398
 399         obd = class_find_client_obd(&uuid, LUSTRE_OSP_NAME,
 400                                    &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 401         if (obd == NULL) {
 402                 CERROR("can't find %s device\n", osp);
 403                 RETURN(-EINVAL);
 404         }
 405
 406         if (gen <= 0) {
 407                 CERROR("%s: request to remove OBD %s with invalid generation %d"
 408                        "\n", obd->obd_name, osp, gen);
 409                 RETURN(-EINVAL);
 410         }
 411
 412         obd_str2uuid(&uuid,  osp);
 413
 414         lod_getref(ltd);
 415         mutex_lock(&ltd->ltd_mutex);
 416         tgt = LTD_TGT(ltd, idx);
 417         /* check that the index is allocated in the bitmap */
 418         if (!test_bit(idx, ltd->ltd_tgt_bitmap) || !tgt) {
 419                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
 420                 GOTO(out, rc = -EINVAL);
 421         }
 422
 423         /* check that the UUID matches */
 424         if (!obd_uuid_equals(&uuid, &tgt->ltd_uuid)) {
 425                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
 426                        obd->obd_name, obd_uuid2str(&tgt->ltd_uuid), idx, osp);
 427                 GOTO(out, rc = -EINVAL);
 428         }
 429
 430         __lod_del_device(env, lod, ltd, tgt);
 431         EXIT;
 432 out:
 433         mutex_unlock(&ltd->ltd_mutex);
 434         lod_putref(lod, ltd);
 435         return(rc);
 436 }
 437
 438 /**
 439  * Resize per-thread storage to hold specified size.
 440  *
 441  * A helper function to resize per-thread temporary storage. This storage
 442  * is used to process LOV/LVM EAs and may be quite large. We do not want to
 443  * allocate/release it every time, so instead we put it into the env and
 444  * reallocate on demand. The memory is released when the correspondent thread
 445  * is finished.
 446  *
 447  * \param[in] info              LOD-specific storage in the environment
 448  * \param[in] size              new size to grow the buffer to
 449
 450  * \retval                      0 on success, -ENOMEM if reallocation failed
 451  */
 452 int lod_ea_store_resize(struct lod_thread_info *info, size_t size)
 453 {
 454         __u32 round = size_roundup_power2(size);
 455
 456         if (info->lti_ea_store) {
 457                 LASSERT(info->lti_ea_store_size);
 458                 LASSERT(info->lti_ea_store_size < round);
 459                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
 460                        info->lti_ea_store_size, round);
 461                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
 462                 info->lti_ea_store = NULL;
 463                 info->lti_ea_store_size = 0;
 464         }
 465
 466         OBD_ALLOC_LARGE(info->lti_ea_store, round);
 467         if (info->lti_ea_store == NULL)
 468                 RETURN(-ENOMEM);
 469         info->lti_ea_store_size = round;
 470
 471         RETURN(0);
 472 }
 473
 474 static void lod_free_comp_buffer(struct lod_layout_component *entries,
 475                                  __u16 count, __u32 bufsize)
 476 {
 477         struct lod_layout_component *entry;
 478         int i;
 479
 480         for (i = 0; i < count; i++) {
 481                 entry = &entries[i];
 482                 if (entry->llc_pool != NULL)
 483                         lod_set_pool(&entry->llc_pool, NULL);
 484                 if (entry->llc_ostlist.op_array)
 485                         OBD_FREE(entry->llc_ostlist.op_array,
 486                                  entry->llc_ostlist.op_size);
 487                 LASSERT(entry->llc_stripe == NULL);
 488                 LASSERT(entry->llc_stripes_allocated == 0);
 489         }
 490
 491         if (bufsize != 0)
 492                 OBD_FREE_LARGE(entries, bufsize);
 493 }
 494
 495 void lod_free_def_comp_entries(struct lod_default_striping *lds)
 496 {
 497         lod_free_comp_buffer(lds->lds_def_comp_entries,
 498                              lds->lds_def_comp_size_cnt,
 499                              size_roundup_power2(
 500                                      sizeof(*lds->lds_def_comp_entries) *
 501                                      lds->lds_def_comp_size_cnt));
 502         lds->lds_def_comp_entries = NULL;
 503         lds->lds_def_comp_cnt = 0;
 504         lds->lds_def_striping_is_composite = 0;
 505         lds->lds_def_comp_size_cnt = 0;
 506 }
 507
 508 /**
 509  * Resize per-thread storage to hold default striping component entries
 510  *
 511  * A helper function to resize per-thread temporary storage. This storage
 512  * is used to hold default LOV/LVM EAs and may be quite large. We do not want
 513  * to allocate/release it every time, so instead we put it into the env and
 514  * reallocate it on demand. The memory is released when the correspondent
 515  * thread is finished.
 516  *
 517  * \param[in,out] lds           default striping
 518  * \param[in] count             new component count to grow the buffer to
 519
 520  * \retval                      0 on success, -ENOMEM if reallocation failed
 521  */
 522 int lod_def_striping_comp_resize(struct lod_default_striping *lds, __u16 count)
 523 {
 524         struct lod_layout_component *entries;
 525         __u32 new = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
 526                                         count);
 527         __u32 old = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
 528                                         lds->lds_def_comp_size_cnt);
 529
 530         if (new <= old)
 531                 return 0;
 532
 533         OBD_ALLOC_LARGE(entries, new);
 534         if (entries == NULL)
 535                 return -ENOMEM;
 536
 537         if (lds->lds_def_comp_entries != NULL) {
 538                 CDEBUG(D_INFO, "default striping component size %d is not "
 539                        "enough, need %d\n", old, new);
 540                 lod_free_def_comp_entries(lds);
 541         }
 542
 543         lds->lds_def_comp_entries = entries;
 544         lds->lds_def_comp_size_cnt = count;
 545
 546         RETURN(0);
 547 }
 548
 549 void lod_free_comp_entries(struct lod_object *lo)
 550 {
 551         if (lo->ldo_mirrors) {
 552                 OBD_FREE_PTR_ARRAY(lo->ldo_mirrors, lo->ldo_mirror_count);
 553                 lo->ldo_mirrors = NULL;
 554                 lo->ldo_mirror_count = 0;
 555         }
 556         lod_free_comp_buffer(lo->ldo_comp_entries,
 557                              lo->ldo_comp_cnt,
 558                              sizeof(*lo->ldo_comp_entries) * lo->ldo_comp_cnt);
 559         lo->ldo_comp_entries = NULL;
 560         lo->ldo_comp_cnt = 0;
 561         lo->ldo_is_composite = 0;
 562 }
 563
 564 int lod_alloc_comp_entries(struct lod_object *lo,
 565                            int mirror_count, int comp_count)
 566 {
 567         LASSERT(comp_count != 0);
 568         LASSERT(lo->ldo_comp_cnt == 0 && lo->ldo_comp_entries == NULL);
 569
 570         if (mirror_count > 0) {
 571                 OBD_ALLOC_PTR_ARRAY(lo->ldo_mirrors, mirror_count);
 572                 if (!lo->ldo_mirrors)
 573                         return -ENOMEM;
 574
 575                 lo->ldo_mirror_count = mirror_count;
 576         }
 577
 578         OBD_ALLOC_LARGE(lo->ldo_comp_entries,
 579                         sizeof(*lo->ldo_comp_entries) * comp_count);
 580         if (lo->ldo_comp_entries == NULL) {
 581                 OBD_FREE_PTR_ARRAY(lo->ldo_mirrors, mirror_count);
 582                 lo->ldo_mirror_count = 0;
 583                 return -ENOMEM;
 584         }
 585
 586         lo->ldo_comp_cnt = comp_count;
 587         return 0;
 588 }
 589
 590 int lod_fill_mirrors(struct lod_object *lo)
 591 {
 592         struct lod_device *lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 593         struct lod_layout_component *lod_comp;
 594         bool found_preferred = false;
 595         int mirror_idx = -1;
 596         __u16 mirror_id = 0xffff;
 597         int i, pref;
 598         ENTRY;
 599
 600         LASSERT(equi(!lo->ldo_is_composite, lo->ldo_mirror_count == 0));
 601
 602         if (!lo->ldo_is_composite)
 603                 RETURN(0);
 604
 605         lod_comp = &lo->ldo_comp_entries[0];
 606
 607         for (i = 0; i < lo->ldo_comp_cnt; i++, lod_comp++) {
 608                 int stale = !!(lod_comp->llc_flags & LCME_FL_STALE);
 609                 int preferred = !!(lod_comp->llc_flags & LCME_FL_PREF_WR);
 610                 int j;
 611
 612                 pref = 0;
 613                 /* calculate component preference over all used OSTs */
 614                 for (j = 0; j < lod_comp->llc_stripes_allocated; j++) {
 615                         int idx = lod_comp->llc_ost_indices[j];
 616                         struct obd_statfs *osfs = &OST_TGT(lod,idx)->ltd_statfs;
 617
 618                         if (osfs->os_state & OS_STATFS_NONROT)
 619                                 pref++;
 620                 }
 621
 622                 if (mirror_id_of(lod_comp->llc_id) == mirror_id) {
 623                         lo->ldo_mirrors[mirror_idx].lme_stale |= stale;
 624                         lo->ldo_mirrors[mirror_idx].lme_prefer |= preferred;
 625                         lo->ldo_mirrors[mirror_idx].lme_preference += pref;
 626                         lo->ldo_mirrors[mirror_idx].lme_end = i;
 627                         continue;
 628                 }
 629
 630                 if (mirror_idx >= 0 && preferred &&
 631                     !lo->ldo_mirrors[mirror_idx].lme_stale)
 632                         found_preferred = true;
 633
 634                 /* new mirror */
 635                 ++mirror_idx;
 636                 if (mirror_idx >= lo->ldo_mirror_count)
 637                         RETURN(-EINVAL);
 638
 639                 mirror_id = mirror_id_of(lod_comp->llc_id);
 640
 641                 lo->ldo_mirrors[mirror_idx].lme_id = mirror_id;
 642                 lo->ldo_mirrors[mirror_idx].lme_stale = stale;
 643                 lo->ldo_mirrors[mirror_idx].lme_prefer = preferred;
 644                 lo->ldo_mirrors[mirror_idx].lme_preference = pref;
 645                 lo->ldo_mirrors[mirror_idx].lme_start = i;
 646                 lo->ldo_mirrors[mirror_idx].lme_end = i;
 647         }
 648         if (mirror_idx != lo->ldo_mirror_count - 1)
 649                 RETURN(-EINVAL);
 650
 651         if (!found_preferred && mirror_idx > 0) {
 652                 int best = -1;
 653
 654                 /*
 655                  * if no explicited preferred found, then find a mirror
 656                  * with higher number of non-rotational OSTs
 657                  * */
 658                 pref = -1;
 659                 for (i = 0; i <= mirror_idx; i++) {
 660                         if (lo->ldo_mirrors[i].lme_stale)
 661                                 continue;
 662                         if (lo->ldo_mirrors[i].lme_preference > pref) {
 663                                 pref = lo->ldo_mirrors[i].lme_preference;
 664                                 best = i;
 665                         }
 666                 }
 667
 668                 LASSERT(best >= 0);
 669                 lo->ldo_mirrors[best].lme_prefer = 1;
 670         }
 671
 672         RETURN(0);
 673 }
 674
 675 /**
 676  * Generate on-disk lov_mds_md structure for each layout component based on
 677  * the information in lod_object->ldo_comp_entries[i].
 678  *
 679  * \param[in] env               execution environment for this thread
 680  * \param[in] lo                LOD object
 681  * \param[in] comp_idx          index of ldo_comp_entries
 682  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 683  * \param[in|out] lmm_size      buffer size/lmm size
 684  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 685  *                              the stripe info is from the default stripe
 686  *                              template, which is collected in lod_ah_init(),
 687  *                              either from parent object or root object; for
 688  *                              file case, it's from the @lo object
 689  *
 690  * \retval                      0 if on disk structure is created successfully
 691  * \retval                      negative error number on failure
 692  */
 693 static int lod_gen_component_ea(const struct lu_env *env,
 694                                 struct lod_object *lo, int comp_idx,
 695                                 struct lov_mds_md *lmm, int *lmm_size,
 696                                 bool is_dir)
 697 {
 698         struct lod_thread_info  *info = lod_env_info(env);
 699         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
 700         struct lod_device       *lod;
 701         struct lov_ost_data_v1  *objs;
 702         struct lod_layout_component *lod_comp;
 703         __u32   magic;
 704         __u16 stripe_count;
 705         int     i, rc = 0;
 706         ENTRY;
 707
 708         LASSERT(lo);
 709         if (is_dir)
 710                 lod_comp =
 711                         &lo->ldo_def_striping->lds_def_comp_entries[comp_idx];
 712         else
 713                 lod_comp = &lo->ldo_comp_entries[comp_idx];
 714
 715         magic = lod_comp->llc_pool != NULL ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
 716         if (lod_comp->llc_pattern == 0) /* default striping */
 717                 lod_comp->llc_pattern = LOV_PATTERN_RAID0;
 718
 719         lmm->lmm_magic = cpu_to_le32(magic);
 720         lmm->lmm_pattern = cpu_to_le32(lod_comp->llc_pattern);
 721         fid_to_lmm_oi(fid, &lmm->lmm_oi);
 722         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
 723                 lmm->lmm_oi.oi.oi_id++;
 724         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
 725
 726         lmm->lmm_stripe_size = cpu_to_le32(lod_comp->llc_stripe_size);
 727         lmm->lmm_stripe_count = cpu_to_le16(lod_comp->llc_stripe_count);
 728         /**
 729          * for dir and uninstantiated component, lmm_layout_gen stores
 730          * default stripe offset.
 731          */
 732         lmm->lmm_layout_gen =
 733                 (is_dir || !lod_comp_inited(lod_comp)) ?
 734                         cpu_to_le16(lod_comp->llc_stripe_offset) :
 735                         cpu_to_le16(lod_comp->llc_layout_gen);
 736
 737         if (magic == LOV_MAGIC_V1) {
 738                 objs = &lmm->lmm_objects[0];
 739         } else {
 740                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
 741                 size_t cplen = strlcpy(v3->lmm_pool_name,
 742                                        lod_comp->llc_pool,
 743                                        sizeof(v3->lmm_pool_name));
 744                 if (cplen >= sizeof(v3->lmm_pool_name))
 745                         RETURN(-E2BIG);
 746                 objs = &v3->lmm_objects[0];
 747         }
 748         stripe_count = lod_comp_entry_stripe_count(lo, comp_idx, is_dir);
 749         if (stripe_count == 0 && !is_dir &&
 750             !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
 751             !(lod_comp->llc_pattern & LOV_PATTERN_MDT))
 752                 RETURN(-E2BIG);
 753
 754         if (!is_dir && lo->ldo_is_composite)
 755                 lod_comp_shrink_stripe_count(lod_comp, &stripe_count);
 756
 757         if (is_dir || lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED)
 758                 GOTO(done, rc = 0);
 759
 760         /* generate ost_idx of this component stripe */
 761         lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 762         for (i = 0; i < stripe_count; i++) {
 763                 struct dt_object *object;
 764                 __u32 ost_idx = (__u32)-1UL;
 765                 int type = LU_SEQ_RANGE_OST;
 766
 767                 if (lod_comp->llc_stripe && lod_comp->llc_stripe[i]) {
 768                         object = lod_comp->llc_stripe[i];
 769                         /* instantiated component */
 770                         info->lti_fid = *lu_object_fid(&object->do_lu);
 771
 772                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF) &&
 773                             comp_idx == 0) {
 774                                 if (cfs_fail_val == 0)
 775                                         cfs_fail_val = info->lti_fid.f_oid;
 776                                 else if (i == 0)
 777                                         info->lti_fid.f_oid = cfs_fail_val;
 778                         }
 779
 780                         rc = fid_to_ostid(&info->lti_fid, &info->lti_ostid);
 781                         LASSERT(rc == 0);
 782
 783                         ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 784                         objs[i].l_ost_gen = cpu_to_le32(0);
 785                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FLD_LOOKUP))
 786                                 rc = -ENOENT;
 787                         else
 788                                 rc = lod_fld_lookup(env, lod, &info->lti_fid,
 789                                                     &ost_idx, &type);
 790                         if (rc < 0) {
 791                                 CERROR("%s: Can not locate "DFID": rc = %d\n",
 792                                        lod2obd(lod)->obd_name,
 793                                        PFID(&info->lti_fid), rc);
 794                                 RETURN(rc);
 795                         }
 796                 } else if (lod_comp->llc_ostlist.op_array &&
 797                            lod_comp->llc_ostlist.op_count) {
 798                         /* user specified ost list */
 799                         ost_idx = lod_comp->llc_ostlist.op_array[i];
 800                 }
 801                 /*
 802                  * with un-instantiated or with no specified ost list
 803                  * component, its l_ost_idx does not matter.
 804                  */
 805                 objs[i].l_ost_idx = cpu_to_le32(ost_idx);
 806         }
 807 done:
 808         if (lmm_size != NULL)
 809                 *lmm_size = lov_mds_md_size(stripe_count, magic);
 810         RETURN(rc);
 811 }
 812
 813 /**
 814  * Generate on-disk lov_mds_md structure based on the information in
 815  * the lod_object->ldo_comp_entries.
 816  *
 817  * \param[in] env               execution environment for this thread
 818  * \param[in] lo                LOD object
 819  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 820  * \param[in|out] lmm_size      buffer size/lmm size
 821  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 822  *                              the stripe info is from the default stripe
 823  *                              template, which is collected in lod_ah_init(),
 824  *                              either from parent object or root object; for
 825  *                              file case, it's from the @lo object
 826  *
 827  * \retval                      0 if on disk structure is created successfully
 828  * \retval                      negative error number on failure
 829  */
 830 int lod_generate_lovea(const struct lu_env *env, struct lod_object *lo,
 831                        struct lov_mds_md *lmm, int *lmm_size, bool is_dir)
 832 {
 833         struct lov_comp_md_entry_v1 *lcme;
 834         struct lov_comp_md_v1 *lcm;
 835         struct lod_layout_component *comp_entries;
 836         __u16 comp_cnt, mirror_cnt;
 837         bool is_composite, is_foreign = false;
 838         int i, rc = 0, offset;
 839         ENTRY;
 840
 841         if (is_dir) {
 842                 comp_cnt = lo->ldo_def_striping->lds_def_comp_cnt;
 843                 mirror_cnt = lo->ldo_def_striping->lds_def_mirror_cnt;
 844                 comp_entries = lo->ldo_def_striping->lds_def_comp_entries;
 845                 is_composite =
 846                         lo->ldo_def_striping->lds_def_striping_is_composite;
 847         } else {
 848                 comp_cnt = lo->ldo_comp_cnt;
 849                 mirror_cnt = lo->ldo_mirror_count;
 850                 comp_entries = lo->ldo_comp_entries;
 851                 is_composite = lo->ldo_is_composite;
 852                 is_foreign = lo->ldo_is_foreign;
 853         }
 854
 855         LASSERT(lmm_size != NULL);
 856
 857         if (is_foreign) {
 858                 struct lov_foreign_md *lfm;
 859
 860                 lfm = (struct lov_foreign_md *)lmm;
 861                 memcpy(lfm, lo->ldo_foreign_lov, lo->ldo_foreign_lov_size);
 862                 /* need to store little-endian */
 863                 if (cpu_to_le32(LOV_MAGIC_FOREIGN) != LOV_MAGIC_FOREIGN) {
 864                         __swab32s(&lfm->lfm_magic);
 865                         __swab32s(&lfm->lfm_length);
 866                         __swab32s(&lfm->lfm_type);
 867                         __swab32s(&lfm->lfm_flags);
 868                 }
 869                 *lmm_size = lo->ldo_foreign_lov_size;
 870                 RETURN(0);
 871         }
 872
 873         LASSERT(comp_cnt != 0 && comp_entries != NULL);
 874
 875         if (!is_composite) {
 876                 rc = lod_gen_component_ea(env, lo, 0, lmm, lmm_size, is_dir);
 877                 RETURN(rc);
 878         }
 879
 880         lcm = (struct lov_comp_md_v1 *)lmm;
 881         memset(lcm, 0, sizeof(*lcm));
 882
 883         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_COMP_V1);
 884         lcm->lcm_entry_count = cpu_to_le16(comp_cnt);
 885         lcm->lcm_mirror_count = cpu_to_le16(mirror_cnt - 1);
 886         lcm->lcm_flags = cpu_to_le16(lo->ldo_flr_state);
 887
 888         offset = sizeof(*lcm) + sizeof(*lcme) * comp_cnt;
 889         LASSERT(offset % sizeof(__u64) == 0);
 890
 891         for (i = 0; i < comp_cnt; i++) {
 892                 struct lod_layout_component *lod_comp;
 893                 struct lov_mds_md *sub_md;
 894                 int size;
 895
 896                 lod_comp = &comp_entries[i];
 897                 lcme = &lcm->lcm_entries[i];
 898
 899                 LASSERT(ergo(!is_dir, lod_comp->llc_id != LCME_ID_INVAL));
 900                 lcme->lcme_id = cpu_to_le32(lod_comp->llc_id);
 901
 902                 /* component could be un-inistantiated */
 903                 lcme->lcme_flags = cpu_to_le32(lod_comp->llc_flags);
 904                 if (lod_comp->llc_flags & LCME_FL_NOSYNC)
 905                         lcme->lcme_timestamp =
 906                                 cpu_to_le64(lod_comp->llc_timestamp);
 907                 if (lod_comp->llc_flags & LCME_FL_EXTENSION && !is_dir)
 908                         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_SEL);
 909
 910                 lcme->lcme_extent.e_start =
 911                         cpu_to_le64(lod_comp->llc_extent.e_start);
 912                 lcme->lcme_extent.e_end =
 913                         cpu_to_le64(lod_comp->llc_extent.e_end);
 914                 lcme->lcme_offset = cpu_to_le32(offset);
 915
 916                 sub_md = (struct lov_mds_md *)((char *)lcm + offset);
 917                 rc = lod_gen_component_ea(env, lo, i, sub_md, &size, is_dir);
 918                 if (rc)
 919                         GOTO(out, rc);
 920                 lcme->lcme_size = cpu_to_le32(size);
 921                 offset += size;
 922                 LASSERTF((offset <= *lmm_size) && (offset % sizeof(__u64) == 0),
 923                          "offset:%d lmm_size:%d\n", offset, *lmm_size);
 924         }
 925         lcm->lcm_size = cpu_to_le32(offset);
 926         lcm->lcm_layout_gen = cpu_to_le32(is_dir ? 0 : lo->ldo_layout_gen);
 927
 928         lustre_print_user_md(D_LAYOUT, (struct lov_user_md *)lmm,
 929                              "generate lum");
 930 out:
 931         if (rc == 0)
 932                 *lmm_size = offset;
 933         RETURN(rc);
 934 }
 935
 936 /**
 937  * Get LOV EA.
 938  *
 939  * Fill lti_ea_store buffer in the environment with a value for the given
 940  * EA. The buffer is reallocated if the value doesn't fit.
 941  *
 942  * \param[in,out] env           execution environment for this thread
 943  *                              .lti_ea_store buffer is filled with EA's value
 944  * \param[in] lo                LOD object
 945  * \param[in] name              name of the EA
 946  *
 947  * \retval                      > 0 if EA is fetched successfully
 948  * \retval                      0 if EA is empty
 949  * \retval                      negative error number on failure
 950  */
 951 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
 952                const char *name)
 953 {
 954         struct lod_thread_info  *info = lod_env_info(env);
 955         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 956         int                     rc;
 957         ENTRY;
 958
 959         LASSERT(info);
 960
 961         if (unlikely(info->lti_ea_store == NULL)) {
 962                 /* just to enter in allocation block below */
 963                 rc = -ERANGE;
 964         } else {
 965 repeat:
 966                 info->lti_buf.lb_buf = info->lti_ea_store;
 967                 info->lti_buf.lb_len = info->lti_ea_store_size;
 968                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
 969         }
 970
 971         /* if object is not striped or inaccessible */
 972         if (rc == -ENODATA || rc == -ENOENT)
 973                 RETURN(0);
 974
 975         if (rc == -ERANGE) {
 976                 /* EA doesn't fit, reallocate new buffer */
 977                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
 978                 if (rc == -ENODATA || rc == -ENOENT)
 979                         RETURN(0);
 980                 else if (rc < 0)
 981                         RETURN(rc);
 982
 983                 LASSERT(rc > 0);
 984                 rc = lod_ea_store_resize(info, rc);
 985                 if (rc)
 986                         RETURN(rc);
 987                 goto repeat;
 988         }
 989
 990         RETURN(rc);
 991 }
 992
 993 /**
 994  * Verify the target index is present in the current configuration.
 995  *
 996  * \param[in] md                LOD device where the target table is stored
 997  * \param[in] idx               target's index
 998  *
 999  * \retval                      0 if the index is present
1000  * \retval                      -EINVAL if not
1001  */
1002 int validate_lod_and_idx(struct lod_device *md, __u32 idx)
1003 {
1004         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
1005                      !test_bit(idx, md->lod_ost_bitmap))) {
1006                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
1007                        md->lod_ost_descs.ltd_tgts_size);
1008                 return -EINVAL;
1009         }
1010
1011         if (unlikely(OST_TGT(md, idx) == NULL)) {
1012                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
1013                        lod2obd(md)->obd_name, idx);
1014                 return -EINVAL;
1015         }
1016
1017         if (unlikely(OST_TGT(md, idx)->ltd_tgt == NULL)) {
1018                 CERROR("%s: invalid lod device, for idx: %d\n",
1019                        lod2obd(md)->obd_name , idx);
1020                 return -EINVAL;
1021         }
1022
1023         return 0;
1024 }
1025
1026 /**
1027  * Instantiate objects for stripes.
1028  *
1029  * Allocate and initialize LU-objects representing the stripes. The number
1030  * of the stripes (ldo_stripe_count) must be initialized already. The caller
1031  * must ensure nobody else is calling the function on the object at the same
1032  * time. FLDB service must be running to be able to map a FID to the targets
1033  * and find appropriate device representing that target.
1034  *
1035  * \param[in] env               execution environment for this thread
1036  * \param[in,out] lo            LOD object
1037  * \param[in] objs              an array of IDs to creates the objects from
1038  * \param[in] comp_idx          index of ldo_comp_entries
1039  *
1040  * \retval                      0 if the objects are instantiated successfully
1041  * \retval                      negative error number on failure
1042  */
1043 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
1044                            struct lov_ost_data_v1 *objs, int comp_idx)
1045 {
1046         struct lod_layout_component *lod_comp;
1047         struct lod_thread_info *info = lod_env_info(env);
1048         struct lod_device *md;
1049         struct lu_object *o, *n;
1050         struct lu_device *nd;
1051         struct dt_object **stripe = NULL;
1052         __u32 *ost_indices = NULL;
1053         int stripe_len;
1054         int i, rc = 0;
1055         __u32 idx;
1056         ENTRY;
1057
1058         LASSERT(lo != NULL);
1059         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1060
1061         LASSERT(lo->ldo_comp_cnt != 0 && lo->ldo_comp_entries != NULL);
1062         lod_comp = &lo->ldo_comp_entries[comp_idx];
1063
1064         LASSERT(lod_comp->llc_stripe == NULL);
1065         LASSERT(lod_comp->llc_stripe_count > 0);
1066         LASSERT(lod_comp->llc_stripe_size > 0);
1067
1068         stripe_len = lod_comp->llc_stripe_count;
1069         OBD_ALLOC_PTR_ARRAY(stripe, stripe_len);
1070         if (stripe == NULL)
1071                 RETURN(-ENOMEM);
1072         OBD_ALLOC_PTR_ARRAY(ost_indices, stripe_len);
1073         if (!ost_indices)
1074                 GOTO(out, rc = -ENOMEM);
1075
1076         for (i = 0; i < lod_comp->llc_stripe_count; i++) {
1077                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
1078                         continue;
1079
1080                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
1081                 idx = le32_to_cpu(objs[i].l_ost_idx);
1082                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
1083                 if (rc != 0)
1084                         GOTO(out, rc);
1085                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
1086                          PFID(&info->lti_fid));
1087                 lod_getref(&md->lod_ost_descs);
1088
1089                 rc = validate_lod_and_idx(md, idx);
1090                 if (unlikely(rc != 0)) {
1091                         lod_putref(md, &md->lod_ost_descs);
1092                         GOTO(out, rc);
1093                 }
1094
1095                 nd = &OST_TGT(md, idx)->ltd_tgt->dd_lu_dev;
1096                 lod_putref(md, &md->lod_ost_descs);
1097
1098                 /* In the function below, .hs_keycmp resolves to
1099                  * u_obj_hop_keycmp() */
1100                 /* coverity[overrun-buffer-val] */
1101                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
1102                 if (IS_ERR(o))
1103                         GOTO(out, rc = PTR_ERR(o));
1104
1105                 n = lu_object_locate(o->lo_header, nd->ld_type);
1106                 LASSERT(n);
1107
1108                 stripe[i] = container_of(n, struct dt_object, do_lu);
1109                 ost_indices[i] = idx;
1110         }
1111
1112 out:
1113         if (rc != 0) {
1114                 for (i = 0; i < stripe_len; i++)
1115                         if (stripe[i] != NULL)
1116                                 dt_object_put(env, stripe[i]);
1117
1118                 OBD_FREE_PTR_ARRAY(stripe, stripe_len);
1119                 lod_comp->llc_stripe_count = 0;
1120                 if (ost_indices)
1121                         OBD_FREE_PTR_ARRAY(ost_indices, stripe_len);
1122         } else {
1123                 lod_comp->llc_stripe = stripe;
1124                 lod_comp->llc_ost_indices = ost_indices;
1125                 lod_comp->llc_stripes_allocated = stripe_len;
1126         }
1127
1128         RETURN(rc);
1129 }
1130
1131 /**
1132  * Instantiate objects for striping.
1133  *
1134  * Parse striping information in \a buf and instantiate the objects
1135  * representing the stripes.
1136  *
1137  * \param[in] env               execution environment for this thread
1138  * \param[in] lo                LOD object
1139  * \param[in] buf               buffer storing LOV EA to parse
1140  *
1141  * \retval                      0 if parsing and objects creation succeed
1142  * \retval                      negative error number on failure
1143  */
1144 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
1145                        const struct lu_buf *buf)
1146 {
1147         struct lov_mds_md_v1 *lmm;
1148         struct lov_comp_md_v1 *comp_v1 = NULL;
1149         struct lov_foreign_md *foreign = NULL;
1150         struct lov_ost_data_v1 *objs;
1151         __u32 magic, pattern;
1152         __u16 mirror_cnt = 0;
1153         __u16 comp_cnt;
1154         int i, rc;
1155         ENTRY;
1156
1157         LASSERT(buf);
1158         LASSERT(buf->lb_buf);
1159         LASSERT(buf->lb_len);
1160         LASSERT(mutex_is_locked(&lo->ldo_layout_mutex));
1161
1162         lmm = (struct lov_mds_md_v1 *)buf->lb_buf;
1163         magic = le32_to_cpu(lmm->lmm_magic);
1164
1165         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3 &&
1166             magic != LOV_MAGIC_COMP_V1 && magic != LOV_MAGIC_FOREIGN &&
1167             magic != LOV_MAGIC_SEL)
1168                 GOTO(out, rc = -EINVAL);
1169
1170         lod_striping_free_nolock(env, lo);
1171
1172         if (magic == LOV_MAGIC_COMP_V1 || magic == LOV_MAGIC_SEL) {
1173                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
1174                 comp_cnt = le16_to_cpu(comp_v1->lcm_entry_count);
1175                 if (comp_cnt == 0)
1176                         GOTO(out, rc = -EINVAL);
1177                 lo->ldo_layout_gen = le32_to_cpu(comp_v1->lcm_layout_gen);
1178                 lo->ldo_is_composite = 1;
1179                 mirror_cnt = le16_to_cpu(comp_v1->lcm_mirror_count) + 1;
1180                 if (mirror_cnt > 1)
1181                         lo->ldo_flr_state = le16_to_cpu(comp_v1->lcm_flags) &
1182                                                         LCM_FL_FLR_MASK;
1183                 else
1184                         lo->ldo_flr_state = LCM_FL_NONE;
1185         } else if (magic == LOV_MAGIC_FOREIGN) {
1186                 size_t length;
1187
1188                 foreign = (struct lov_foreign_md *)buf->lb_buf;
1189                 length = offsetof(typeof(*foreign), lfm_value);
1190                 if (buf->lb_len < length ||
1191                     buf->lb_len < (length + le32_to_cpu(foreign->lfm_length))) {
1192                         CDEBUG(D_LAYOUT,
1193                                "buf len %zu too small for lov_foreign_md\n",
1194                                buf->lb_len);
1195                         GOTO(out, rc = -EINVAL);
1196                 }
1197
1198                 /* just cache foreign LOV EA raw */
1199                 rc = lod_alloc_foreign_lov(lo, length);
1200                 if (rc)
1201                         GOTO(out, rc);
1202                 memcpy(lo->ldo_foreign_lov, buf->lb_buf, length);
1203                 GOTO(out, rc);
1204         } else {
1205                 comp_cnt = 1;
1206                 lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1207                 lo->ldo_is_composite = 0;
1208         }
1209
1210         rc = lod_alloc_comp_entries(lo, mirror_cnt, comp_cnt);
1211         if (rc)
1212                 GOTO(out, rc);
1213
1214         for (i = 0; i < comp_cnt; i++) {
1215                 struct lod_layout_component *lod_comp;
1216                 struct lu_extent *ext;
1217                 __u32 offs;
1218
1219                 lod_comp = &lo->ldo_comp_entries[i];
1220                 if (lo->ldo_is_composite) {
1221                         offs = le32_to_cpu(comp_v1->lcm_entries[i].lcme_offset);
1222                         lmm = (struct lov_mds_md_v1 *)((char *)comp_v1 + offs);
1223
1224                         ext = &comp_v1->lcm_entries[i].lcme_extent;
1225                         lod_comp->llc_extent.e_start =
1226                                 le64_to_cpu(ext->e_start);
1227                         if (lod_comp->llc_extent.e_start &
1228                             (LOV_MIN_STRIPE_SIZE - 1)) {
1229                                 CDEBUG(D_LAYOUT,
1230                                        "extent start %llu is not a multiple of min size %u\n",
1231                                        lod_comp->llc_extent.e_start,
1232                                        LOV_MIN_STRIPE_SIZE);
1233                                 GOTO(out, rc = -EINVAL);
1234                         }
1235
1236                         lod_comp->llc_extent.e_end = le64_to_cpu(ext->e_end);
1237                         if (lod_comp->llc_extent.e_end != LUSTRE_EOF &&
1238                             lod_comp->llc_extent.e_end &
1239                             (LOV_MIN_STRIPE_SIZE - 1)) {
1240                                 CDEBUG(D_LAYOUT,
1241                                        "extent end %llu is not a multiple of min size %u\n",
1242                                        lod_comp->llc_extent.e_end,
1243                                        LOV_MIN_STRIPE_SIZE);
1244                                 GOTO(out, rc = -EINVAL);
1245                         }
1246
1247                         lod_comp->llc_flags =
1248                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_flags);
1249                         if (lod_comp->llc_flags & LCME_FL_NOSYNC)
1250                                 lod_comp->llc_timestamp = le64_to_cpu(
1251                                         comp_v1->lcm_entries[i].lcme_timestamp);
1252                         lod_comp->llc_id =
1253                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_id);
1254                         if (lod_comp->llc_id == LCME_ID_INVAL)
1255                                 GOTO(out, rc = -EINVAL);
1256
1257                         if ((lod_comp->llc_flags & LCME_FL_EXTENSION) &&
1258                             comp_v1->lcm_magic != cpu_to_le32(LOV_MAGIC_SEL)) {
1259                                 struct lod_device *d =
1260                                         lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1261
1262                                 CWARN("%s: EXTENSION flags=%x set on component[%u]=%x of non-SEL file "DFID" with magic=%#08x\n",
1263                                       lod2obd(d)->obd_name,
1264                                       lod_comp->llc_flags, lod_comp->llc_id, i,
1265                                       PFID(lod_object_fid(lo)),
1266                                       le32_to_cpu(comp_v1->lcm_magic));
1267                         }
1268                 } else {
1269                         lod_comp_set_init(lod_comp);
1270                 }
1271
1272                 pattern = le32_to_cpu(lmm->lmm_pattern);
1273                 if (!lov_pattern_supported(lov_pattern(pattern)))
1274                         GOTO(out, rc = -EINVAL);
1275
1276                 lod_comp->llc_pattern = pattern;
1277                 lod_comp->llc_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
1278                 lod_comp->llc_stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
1279                 lod_comp->llc_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1280
1281                 if (lmm->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)) {
1282                         struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
1283
1284                         lod_set_pool(&lod_comp->llc_pool, v3->lmm_pool_name);
1285                         objs = &v3->lmm_objects[0];
1286                 } else {
1287                         lod_set_pool(&lod_comp->llc_pool, NULL);
1288                         objs = &lmm->lmm_objects[0];
1289                 }
1290
1291                 /**
1292                  * If uninstantiated template component has valid l_ost_idx,
1293                  * then user has specified ost list for this component.
1294                  */
1295                 if (!lod_comp_inited(lod_comp)) {
1296                         __u16 stripe_count;
1297
1298                         if (objs[0].l_ost_idx != (__u32)-1UL) {
1299                                 int j;
1300
1301                                 stripe_count = lod_comp_entry_stripe_count(
1302                                                         lo, i, false);
1303                                 if (stripe_count == 0 &&
1304                                     !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1305                                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT))
1306                                         GOTO(out, rc = -E2BIG);
1307                                 /**
1308                                  * load the user specified ost list, when this
1309                                  * component is instantiated later, it will be
1310                                  * used in lod_alloc_ost_list().
1311                                  */
1312                                 lod_comp->llc_ostlist.op_count = stripe_count;
1313                                 lod_comp->llc_ostlist.op_size =
1314                                         stripe_count * sizeof(__u32);
1315                                 OBD_ALLOC(lod_comp->llc_ostlist.op_array,
1316                                           lod_comp->llc_ostlist.op_size);
1317                                 if (!lod_comp->llc_ostlist.op_array)
1318                                         GOTO(out, rc = -ENOMEM);
1319
1320                                 for (j = 0; j < stripe_count; j++)
1321                                         lod_comp->llc_ostlist.op_array[j] =
1322                                                 le32_to_cpu(objs[j].l_ost_idx);
1323
1324                                 /**
1325                                  * this component OST objects starts from the
1326                                  * first ost_idx, lod_alloc_ost_list() will
1327                                  * check this.
1328                                  */
1329                                 lod_comp->llc_stripe_offset = objs[0].l_ost_idx;
1330                         } else {
1331                                 /**
1332                                  * for uninstantiated component,
1333                                  * lmm_layout_gen stores default stripe offset.
1334                                  */
1335                                 lod_comp->llc_stripe_offset =
1336                                                         lmm->lmm_layout_gen;
1337                         }
1338                 }
1339
1340                 /* skip un-instantiated component object initialization */
1341                 if (!lod_comp_inited(lod_comp))
1342                         continue;
1343
1344                 if (!(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1345                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
1346                         rc = lod_initialize_objects(env, lo, objs, i);
1347                         if (rc)
1348                                 GOTO(out, rc);
1349                 }
1350         }
1351
1352         rc = lod_fill_mirrors(lo);
1353         if (rc)
1354                 GOTO(out, rc);
1355
1356 out:
1357         if (rc)
1358                 lod_striping_free_nolock(env, lo);
1359         RETURN(rc);
1360 }
1361
1362 /**
1363  * Check whether the striping (LOVEA for regular file, LMVEA for directory)
1364  * is already cached.
1365  *
1366  * \param[in] lo        LOD object
1367  *
1368  * \retval              True if the striping is cached, otherwise
1369  *                      return false.
1370  */
1371 static bool lod_striping_loaded(struct lod_object *lo)
1372 {
1373         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1374             lo->ldo_comp_cached)
1375                 return true;
1376
1377         if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1378                 if (lo->ldo_dir_stripe_loaded)
1379                         return true;
1380
1381                 /* Never load LMV stripe for slaves of striped dir */
1382                 if (lo->ldo_dir_slave_stripe)
1383                         return true;
1384         }
1385
1386         return false;
1387 }
1388
1389 /**
1390  * A generic function to initialize the stripe objects.
1391  *
1392  * A protected version of lod_striping_load_locked() - load the striping
1393  * information from storage, parse that and instantiate LU objects to
1394  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1395  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1396  * return an array of references to the newly instantiated objects.
1397  *
1398  * \param[in] env               execution environment for this thread
1399  * \param[in,out] lo            LOD object, where striping is stored and
1400  *                              which gets an array of references
1401  *
1402  * \retval                      0 if parsing and object creation succeed
1403  * \retval                      negative error number on failure
1404  **/
1405 int lod_striping_load(const struct lu_env *env, struct lod_object *lo)
1406 {
1407         struct lod_thread_info *info = lod_env_info(env);
1408         struct dt_object *next = dt_object_child(&lo->ldo_obj);
1409         struct lu_buf *buf = &info->lti_buf;
1410         int rc = 0;
1411
1412         ENTRY;
1413
1414         if (!dt_object_exists(next))
1415                 RETURN(0);
1416
1417         if (lod_striping_loaded(lo))
1418                 RETURN(0);
1419
1420         mutex_lock(&lo->ldo_layout_mutex);
1421         if (lod_striping_loaded(lo))
1422                 GOTO(unlock, rc = 0);
1423
1424         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr)) {
1425                 rc = lod_get_lov_ea(env, lo);
1426                 if (rc <= 0)
1427                         GOTO(unlock, rc);
1428
1429                 /*
1430                  * there is LOV EA (striping information) in this object
1431                  * let's parse it and create in-core objects for the stripes
1432                  */
1433                 buf->lb_buf = info->lti_ea_store;
1434                 buf->lb_len = info->lti_ea_store_size;
1435                 rc = lod_parse_striping(env, lo, buf);
1436                 if (rc == 0)
1437                         lo->ldo_comp_cached = 1;
1438         } else if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1439                 rc = lod_get_lmv_ea(env, lo);
1440                 if (rc > sizeof(struct lmv_foreign_md)) {
1441                         struct lmv_foreign_md *lfm = info->lti_ea_store;
1442
1443                         if (le32_to_cpu(lfm->lfm_magic) == LMV_MAGIC_FOREIGN) {
1444                                 lo->ldo_foreign_lmv = info->lti_ea_store;
1445                                 lo->ldo_foreign_lmv_size =
1446                                         info->lti_ea_store_size;
1447                                 info->lti_ea_store = NULL;
1448                                 info->lti_ea_store_size = 0;
1449
1450                                 lo->ldo_dir_stripe_loaded = 1;
1451                                 lo->ldo_dir_is_foreign = 1;
1452                                 GOTO(unlock, rc = 0);
1453                         }
1454                 }
1455
1456                 if (rc < (int)sizeof(struct lmv_mds_md_v1)) {
1457                         /* Let's set stripe_loaded to avoid further
1458                          * stripe loading especially for non-stripe directory,
1459                          * which can hurt performance. (See LU-9840)
1460                          */
1461                         if (rc == 0)
1462                                 lo->ldo_dir_stripe_loaded = 1;
1463                         GOTO(unlock, rc = rc > 0 ? -EINVAL : rc);
1464                 }
1465                 buf->lb_buf = info->lti_ea_store;
1466                 buf->lb_len = info->lti_ea_store_size;
1467                 if (rc == sizeof(struct lmv_mds_md_v1)) {
1468                         rc = lod_load_lmv_shards(env, lo, buf, true);
1469                         if (buf->lb_buf != info->lti_ea_store) {
1470                                 OBD_FREE_LARGE(info->lti_ea_store,
1471                                                info->lti_ea_store_size);
1472                                 info->lti_ea_store = buf->lb_buf;
1473                                 info->lti_ea_store_size = buf->lb_len;
1474                         }
1475
1476                         if (rc < 0)
1477                                 GOTO(unlock, rc);
1478                 }
1479
1480                 /*
1481                  * there is LMV EA (striping information) in this object
1482                  * let's parse it and create in-core objects for the stripes
1483                  */
1484                 rc = lod_parse_dir_striping(env, lo, buf);
1485                 if (rc == 0)
1486                         lo->ldo_dir_stripe_loaded = 1;
1487         }
1488         EXIT;
1489 unlock:
1490         mutex_unlock(&lo->ldo_layout_mutex);
1491
1492         return rc;
1493 }
1494
1495 int lod_striping_reload(const struct lu_env *env, struct lod_object *lo,
1496                          const struct lu_buf *buf)
1497 {
1498         int rc;
1499
1500         ENTRY;
1501
1502         mutex_lock(&lo->ldo_layout_mutex);
1503         rc = lod_parse_striping(env, lo, buf);
1504         mutex_unlock(&lo->ldo_layout_mutex);
1505
1506         RETURN(rc);
1507 }
1508
1509 /**
1510  * Verify lov_user_md_v1/v3 striping.
1511  *
1512  * Check the validity of all fields including the magic, stripe size,
1513  * stripe count, stripe offset and that the pool is present.  Also check
1514  * that each target index points to an existing target. The additional
1515  * \a is_from_disk turns additional checks. In some cases zero fields
1516  * are allowed (like pattern=0).
1517  *
1518  * \param[in] d                 LOD device
1519  * \param[in] buf               buffer with LOV EA to verify
1520  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1521  *                              1 - from disk, do not allow
1522  *
1523  * \retval                      0 if the striping is valid
1524  * \retval                      -EINVAL if striping is invalid
1525  */
1526 static int lod_verify_v1v3(struct lod_device *d, const struct lu_buf *buf,
1527                            bool is_from_disk)
1528 {
1529         struct lov_user_md_v1   *lum;
1530         struct lov_user_md_v3   *lum3;
1531         struct pool_desc        *pool = NULL;
1532         __u32                    magic;
1533         __u32                    stripe_size;
1534         __u16                    stripe_count;
1535         __u16                    stripe_offset;
1536         size_t                   lum_size;
1537         int                      rc = 0;
1538         ENTRY;
1539
1540         lum = buf->lb_buf;
1541
1542         if (buf->lb_len < sizeof(*lum)) {
1543                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1544                        buf->lb_len);
1545                 GOTO(out, rc = -EINVAL);
1546         }
1547
1548         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1549         if (magic != LOV_USER_MAGIC_V1 &&
1550             magic != LOV_USER_MAGIC_V3 &&
1551             magic != LOV_USER_MAGIC_SPECIFIC) {
1552                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1553                        le32_to_cpu(lum->lmm_magic));
1554                 GOTO(out, rc = -EINVAL);
1555         }
1556
1557         /* the user uses "0" for default stripe pattern normally. */
1558         if (!is_from_disk && lum->lmm_pattern == LOV_PATTERN_NONE)
1559                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1560
1561         if (!lov_pattern_supported(le32_to_cpu(lum->lmm_pattern))) {
1562                 CDEBUG(D_LAYOUT, "bad userland stripe pattern: %#x\n",
1563                        le32_to_cpu(lum->lmm_pattern));
1564                 GOTO(out, rc = -EINVAL);
1565         }
1566
1567         /* a released lum comes from creating orphan on hsm release,
1568          * doesn't make sense to verify it. */
1569         if (le32_to_cpu(lum->lmm_pattern) & LOV_PATTERN_F_RELEASED)
1570                 GOTO(out, rc = 0);
1571
1572         /* 64kB is the largest common page size we see (ia64), and matches the
1573          * check in lfs */
1574         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1575         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1576                 CDEBUG(D_LAYOUT, "stripe size %u not a multiple of %u\n",
1577                        stripe_size, LOV_MIN_STRIPE_SIZE);
1578                 GOTO(out, rc = -EINVAL);
1579         }
1580
1581         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1582         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT &&
1583             lov_pattern(le32_to_cpu(lum->lmm_pattern)) != LOV_PATTERN_MDT) {
1584                 /* if offset is not within valid range [0, osts_size) */
1585                 if (stripe_offset >= d->lod_ost_descs.ltd_tgts_size) {
1586                         CDEBUG(D_LAYOUT, "stripe offset %u >= bitmap size %u\n",
1587                                stripe_offset, d->lod_ost_descs.ltd_tgts_size);
1588                         GOTO(out, rc = -EINVAL);
1589                 }
1590
1591                 /* if lmm_stripe_offset is *not* in bitmap */
1592                 if (!test_bit(stripe_offset, d->lod_ost_bitmap)) {
1593                         CDEBUG(D_LAYOUT, "stripe offset %u not in bitmap\n",
1594                                stripe_offset);
1595                         GOTO(out, rc = -EINVAL);
1596                 }
1597         }
1598
1599         if (magic == LOV_USER_MAGIC_V1)
1600                 lum_size = offsetof(struct lov_user_md_v1,
1601                                     lmm_objects[0]);
1602         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC)
1603                 lum_size = offsetof(struct lov_user_md_v3,
1604                                     lmm_objects[0]);
1605         else
1606                 GOTO(out, rc = -EINVAL);
1607
1608         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1609         if (buf->lb_len < lum_size) {
1610                 CDEBUG(D_LAYOUT, "invalid buf len %zu/%zu for lov_user_md with "
1611                        "magic %#x and stripe_count %u\n",
1612                        buf->lb_len, lum_size, magic, stripe_count);
1613                 GOTO(out, rc = -EINVAL);
1614         }
1615
1616         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC))
1617                 goto out;
1618
1619         lum3 = buf->lb_buf;
1620         /* In the function below, .hs_keycmp resolves to
1621          * pool_hashkey_keycmp() */
1622         /* coverity[overrun-buffer-val] */
1623         pool = lod_find_pool(d, lum3->lmm_pool_name);
1624         if (pool == NULL)
1625                 goto out;
1626
1627         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT) {
1628                 rc = lod_check_index_in_pool(stripe_offset, pool);
1629                 if (rc < 0)
1630                         GOTO(out, rc = -EINVAL);
1631         }
1632
1633         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1634                 CDEBUG(D_LAYOUT, "stripe count %u > # OSTs %u in the pool\n",
1635                        stripe_count, pool_tgt_count(pool));
1636                 GOTO(out, rc = -EINVAL);
1637         }
1638
1639 out:
1640         if (pool != NULL)
1641                 lod_pool_putref(pool);
1642
1643         RETURN(rc);
1644 }
1645
1646 static inline
1647 struct lov_comp_md_entry_v1 *comp_entry_v1(struct lov_comp_md_v1 *comp, int i)
1648 {
1649         LASSERTF((le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1650                  LOV_USER_MAGIC_COMP_V1, "Wrong magic %x\n",
1651                  le32_to_cpu(comp->lcm_magic));
1652         LASSERTF(i >= 0 && i < le16_to_cpu(comp->lcm_entry_count),
1653                  "bad index %d, max = %d\n",
1654                  i, le16_to_cpu(comp->lcm_entry_count));
1655
1656         return &comp->lcm_entries[i];
1657 }
1658
1659 #define for_each_comp_entry_v1(comp, entry) \
1660         for (entry = comp_entry_v1(comp, 0); \
1661              entry <= comp_entry_v1(comp, \
1662                                    le16_to_cpu(comp->lcm_entry_count) - 1); \
1663              entry++)
1664
1665 int lod_erase_dom_stripe(struct lov_comp_md_v1 *comp_v1,
1666                          struct lov_comp_md_entry_v1 *dom_ent)
1667 {
1668         struct lov_comp_md_entry_v1 *ent;
1669         __u16 entries;
1670         __u32 dom_off, dom_size, comp_size, off;
1671         void *src, *dst;
1672         unsigned int size, shift;
1673
1674         entries = le16_to_cpu(comp_v1->lcm_entry_count) - 1;
1675         LASSERT(entries > 0);
1676         comp_v1->lcm_entry_count = cpu_to_le16(entries);
1677
1678         comp_size = le32_to_cpu(comp_v1->lcm_size);
1679         dom_off = le32_to_cpu(dom_ent->lcme_offset);
1680         dom_size = le32_to_cpu(dom_ent->lcme_size);
1681
1682         /* all entries offsets are shifted by entry size at least */
1683         shift = sizeof(*dom_ent);
1684         for_each_comp_entry_v1(comp_v1, ent) {
1685                 off = le32_to_cpu(ent->lcme_offset);
1686                 if (off == dom_off) {
1687                         /* Entry deletion creates two holes in layout data:
1688                          * - hole in entries array
1689                          * - hole in layout data at dom_off with dom_size
1690                          *
1691                          * First memmove is one entry shift from next entry
1692                          * start with size up to dom_off in blob
1693                          */
1694                         dst = (void *)ent;
1695                         src = (void *)(ent + 1);
1696                         size = (unsigned long)((void *)comp_v1 + dom_off - src);
1697                         memmove(dst, src, size);
1698                         /* take 'off' from just moved entry */
1699                         off = le32_to_cpu(ent->lcme_offset);
1700                         /* second memmove is blob tail after 'off' up to
1701                          * component end
1702                          */
1703                         dst = (void *)comp_v1 + dom_off - sizeof(*ent);
1704                         src = (void *)comp_v1 + off;
1705                         size = (unsigned long)(comp_size - off);
1706                         memmove(dst, src, size);
1707                         /* all entries offsets after DoM entry are shifted by
1708                          * dom_size additionally
1709                          */
1710                         shift += dom_size;
1711                 }
1712                 ent->lcme_offset = cpu_to_le32(off - shift);
1713         }
1714         comp_v1->lcm_size = cpu_to_le32(comp_size - shift);
1715
1716         /* notify a caller to re-check entry */
1717         return -ERESTART;
1718 }
1719
1720 void lod_dom_stripesize_recalc(struct lod_device *d)
1721 {
1722         __u64 threshold_mb = d->lod_dom_threshold_free_mb;
1723         __u32 max_size = d->lod_dom_stripesize_max_kb;
1724         __u32 def_size = d->lod_dom_stripesize_cur_kb;
1725
1726         /* use maximum allowed value if free space is above threshold */
1727         if (d->lod_lsfs_free_mb >= threshold_mb) {
1728                 def_size = max_size;
1729         } else if (!d->lod_lsfs_free_mb || max_size <= LOD_DOM_MIN_SIZE_KB) {
1730                 def_size = 0;
1731         } else {
1732                 /* recalc threshold like it would be with def_size as max */
1733                 threshold_mb = mult_frac(threshold_mb, def_size, max_size);
1734                 if (d->lod_lsfs_free_mb < threshold_mb)
1735                         def_size = rounddown(def_size / 2, LOD_DOM_MIN_SIZE_KB);
1736                 else if (d->lod_lsfs_free_mb > threshold_mb * 2)
1737                         def_size = max_t(unsigned int, def_size * 2,
1738                                          LOD_DOM_MIN_SIZE_KB);
1739         }
1740
1741         if (d->lod_dom_stripesize_cur_kb != def_size) {
1742                 CDEBUG(D_LAYOUT, "Change default DOM stripe size %d->%d\n",
1743                        d->lod_dom_stripesize_cur_kb, def_size);
1744                 d->lod_dom_stripesize_cur_kb = def_size;
1745         }
1746 }
1747
1748 static __u32 lod_dom_stripesize_limit(const struct lu_env *env,
1749                                       struct lod_device *d)
1750 {
1751         int rc;
1752
1753         /* set bfree as fraction of total space */
1754         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_SPOOF)) {
1755                 spin_lock(&d->lod_lsfs_lock);
1756                 d->lod_lsfs_free_mb = mult_frac(d->lod_lsfs_total_mb,
1757                                         min_t(int, cfs_fail_val, 100), 100);
1758                 GOTO(recalc, rc = 0);
1759         }
1760
1761         if (d->lod_lsfs_age < ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE) {
1762                 struct obd_statfs sfs;
1763
1764                 spin_lock(&d->lod_lsfs_lock);
1765                 if (d->lod_lsfs_age > ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE)
1766                         GOTO(unlock, rc = 0);
1767
1768                 d->lod_lsfs_age = ktime_get_seconds();
1769                 spin_unlock(&d->lod_lsfs_lock);
1770                 rc = dt_statfs(env, d->lod_child, &sfs);
1771                 if (rc) {
1772                         CDEBUG(D_LAYOUT,
1773                                "%s: failed to get OSD statfs: rc = %d\n",
1774                                lod2obd(d)->obd_name, rc);
1775                         GOTO(out, rc);
1776                 }
1777                 /* udpate local OSD cached statfs data */
1778                 spin_lock(&d->lod_lsfs_lock);
1779                 d->lod_lsfs_total_mb = (sfs.os_blocks * sfs.os_bsize) >> 20;
1780                 d->lod_lsfs_free_mb = (sfs.os_bfree * sfs.os_bsize) >> 20;
1781 recalc:
1782                 lod_dom_stripesize_recalc(d);
1783 unlock:
1784                 spin_unlock(&d->lod_lsfs_lock);
1785         }
1786 out:
1787         return d->lod_dom_stripesize_cur_kb << 10;
1788 }
1789
1790 int lod_dom_stripesize_choose(const struct lu_env *env, struct lod_device *d,
1791                               struct lov_comp_md_v1 *comp_v1,
1792                               struct lov_comp_md_entry_v1 *dom_ent,
1793                               __u32 stripe_size)
1794 {
1795         struct lov_comp_md_entry_v1 *ent;
1796         struct lu_extent *dom_ext, *ext;
1797         struct lov_user_md_v1 *lum;
1798         __u32 max_stripe_size;
1799         __u16 mid, dom_mid;
1800         int rc = 0;
1801         bool dom_next_entry = false;
1802
1803         dom_ext = &dom_ent->lcme_extent;
1804         dom_mid = mirror_id_of(le32_to_cpu(dom_ent->lcme_id));
1805         max_stripe_size = lod_dom_stripesize_limit(env, d);
1806
1807         /* Check stripe size againts current per-MDT limit */
1808         if (stripe_size <= max_stripe_size)
1809                 return 0;
1810
1811         lum = (void *)comp_v1 + le32_to_cpu(dom_ent->lcme_offset);
1812         CDEBUG(D_LAYOUT, "overwrite DoM component size %u with MDT limit %u\n",
1813                stripe_size, max_stripe_size);
1814         lum->lmm_stripe_size = cpu_to_le32(max_stripe_size);
1815
1816         /* In common case the DoM stripe is first entry in a mirror and
1817          * can be deleted only if it is not single entry in layout or
1818          * mirror, otherwise error should be returned.
1819          */
1820         for_each_comp_entry_v1(comp_v1, ent) {
1821                 if (ent == dom_ent)
1822                         continue;
1823
1824                 mid = mirror_id_of(le32_to_cpu(ent->lcme_id));
1825                 if (mid != dom_mid)
1826                         continue;
1827
1828                 ext = &ent->lcme_extent;
1829                 if (ext->e_start != dom_ext->e_end)
1830                         continue;
1831
1832                 /* Found next component after the DoM one with the same
1833                  * mirror_id and adjust its start with DoM component end.
1834                  *
1835                  * NOTE: we are considering here that there can be only one
1836                  * DoM component in a file, all replicas are located on OSTs
1837                  * always and don't need adjustment since use own layouts.
1838                  */
1839                 ext->e_start = cpu_to_le64(max_stripe_size);
1840                 dom_next_entry = true;
1841                 break;
1842         }
1843
1844         if (max_stripe_size == 0) {
1845                 /* DoM component size is zero due to server setting, remove
1846                  * it from the layout but only if next component exists in
1847                  * the same mirror. That must be checked prior calling the
1848                  * lod_erase_dom_stripe().
1849                  */
1850                 if (!dom_next_entry)
1851                         return -EFBIG;
1852
1853                 rc = lod_erase_dom_stripe(comp_v1, dom_ent);
1854         } else {
1855                 /* Update DoM extent end finally */
1856                 dom_ext->e_end = cpu_to_le64(max_stripe_size);
1857         }
1858
1859         return rc;
1860 }
1861
1862 /**
1863  * Verify LOV striping.
1864  *
1865  * \param[in] d                 LOD device
1866  * \param[in] buf               buffer with LOV EA to verify
1867  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1868  *                              1 - from disk, do not allow
1869  * \param[in] start             extent start for composite layout
1870  *
1871  * \retval                      0 if the striping is valid
1872  * \retval                      -EINVAL if striping is invalid
1873  */
1874 int lod_verify_striping(const struct lu_env *env, struct lod_device *d,
1875                         struct lod_object *lo, const struct lu_buf *buf,
1876                         bool is_from_disk)
1877 {
1878         struct lov_user_md_v1   *lum;
1879         struct lov_comp_md_v1   *comp_v1;
1880         struct lov_comp_md_entry_v1     *ent;
1881         struct lu_extent        *ext;
1882         struct lu_buf   tmp;
1883         __u64   prev_end = 0;
1884         __u32   stripe_size = 0;
1885         __u16   prev_mid = -1, mirror_id = -1;
1886         __u32   mirror_count;
1887         __u32   magic;
1888         int     rc = 0;
1889         ENTRY;
1890
1891         if (buf->lb_len < sizeof(lum->lmm_magic)) {
1892                 CDEBUG(D_LAYOUT, "invalid buf len %zu\n", buf->lb_len);
1893                 RETURN(-EINVAL);
1894         }
1895
1896         lum = buf->lb_buf;
1897
1898         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1899         /* treat foreign LOV EA/object case first
1900          * XXX is it expected to try setting again a foreign?
1901          * XXX should we care about different current vs new layouts ?
1902          */
1903         if (unlikely(magic == LOV_USER_MAGIC_FOREIGN)) {
1904                 struct lov_foreign_md *lfm = buf->lb_buf;
1905
1906                 if (buf->lb_len < offsetof(typeof(*lfm), lfm_value)) {
1907                         CDEBUG(D_LAYOUT,
1908                                "buf len %zu < min lov_foreign_md size (%zu)\n",
1909                                buf->lb_len, offsetof(typeof(*lfm),
1910                                lfm_value));
1911                         RETURN(-EINVAL);
1912                 }
1913
1914                 if (foreign_size_le(lfm) > buf->lb_len) {
1915                         CDEBUG(D_LAYOUT,
1916                                "buf len %zu < this lov_foreign_md size (%zu)\n",
1917                                buf->lb_len, foreign_size_le(lfm));
1918                         RETURN(-EINVAL);
1919                 }
1920                 /* Don't do anything with foreign layouts */
1921                 RETURN(0);
1922         }
1923
1924         /* normal LOV/layout cases */
1925
1926         if (buf->lb_len < sizeof(*lum)) {
1927                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1928                        buf->lb_len);
1929                 RETURN(-EINVAL);
1930         }
1931
1932         if (magic != LOV_USER_MAGIC_V1 &&
1933             magic != LOV_USER_MAGIC_V3 &&
1934             magic != LOV_USER_MAGIC_SPECIFIC &&
1935             magic != LOV_USER_MAGIC_COMP_V1) {
1936                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1937                        le32_to_cpu(lum->lmm_magic));
1938                 RETURN(-EINVAL);
1939         }
1940
1941         if (magic != LOV_USER_MAGIC_COMP_V1)
1942                 RETURN(lod_verify_v1v3(d, buf, is_from_disk));
1943
1944         /* magic == LOV_USER_MAGIC_COMP_V1 */
1945         comp_v1 = buf->lb_buf;
1946         if (buf->lb_len < le32_to_cpu(comp_v1->lcm_size)) {
1947                 CDEBUG(D_LAYOUT, "buf len %zu is less than %u\n",
1948                        buf->lb_len, le32_to_cpu(comp_v1->lcm_size));
1949                 RETURN(-EINVAL);
1950         }
1951
1952 recheck:
1953         mirror_count = 0;
1954         if (le16_to_cpu(comp_v1->lcm_entry_count) == 0) {
1955                 CDEBUG(D_LAYOUT, "entry count is zero\n");
1956                 RETURN(-EINVAL);
1957         }
1958
1959         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1960             lo->ldo_comp_cnt > 0) {
1961                 /* could be called from lustre.lov.add */
1962                 __u32 cnt = lo->ldo_comp_cnt;
1963
1964                 ext = &lo->ldo_comp_entries[cnt - 1].llc_extent;
1965                 prev_end = ext->e_end;
1966
1967                 ++mirror_count;
1968         }
1969
1970         for_each_comp_entry_v1(comp_v1, ent) {
1971                 ext = &ent->lcme_extent;
1972
1973                 if (le64_to_cpu(ext->e_start) > le64_to_cpu(ext->e_end) ||
1974                     le64_to_cpu(ext->e_start) & (LOV_MIN_STRIPE_SIZE - 1) ||
1975                     (le64_to_cpu(ext->e_end) != LUSTRE_EOF &&
1976                     le64_to_cpu(ext->e_end) & (LOV_MIN_STRIPE_SIZE - 1))) {
1977                         CDEBUG(D_LAYOUT, "invalid extent "DEXT"\n",
1978                                le64_to_cpu(ext->e_start),
1979                                le64_to_cpu(ext->e_end));
1980                         RETURN(-EINVAL);
1981                 }
1982
1983                 if (is_from_disk) {
1984                         /* lcme_id contains valid value */
1985                         if (le32_to_cpu(ent->lcme_id) == 0 ||
1986                             le32_to_cpu(ent->lcme_id) > LCME_ID_MAX) {
1987                                 CDEBUG(D_LAYOUT, "invalid id %u\n",
1988                                        le32_to_cpu(ent->lcme_id));
1989                                 RETURN(-EINVAL);
1990                         }
1991
1992                         if (le16_to_cpu(comp_v1->lcm_mirror_count) > 0) {
1993                                 mirror_id = mirror_id_of(
1994                                                 le32_to_cpu(ent->lcme_id));
1995
1996                                 /* first component must start with 0 */
1997                                 if (mirror_id != prev_mid &&
1998                                     le64_to_cpu(ext->e_start) != 0) {
1999                                         CDEBUG(D_LAYOUT,
2000                                                "invalid start:%llu, expect:0\n",
2001                                                le64_to_cpu(ext->e_start));
2002                                         RETURN(-EINVAL);
2003                                 }
2004
2005                                 prev_mid = mirror_id;
2006                         }
2007                 }
2008
2009                 if (le64_to_cpu(ext->e_start) == 0) {
2010                         ++mirror_count;
2011                         prev_end = 0;
2012                 }
2013
2014                 /* the next must be adjacent with the previous one */
2015                 if (le64_to_cpu(ext->e_start) != prev_end) {
2016                         CDEBUG(D_LAYOUT,
2017                                "invalid start actual:%llu, expect:%llu\n",
2018                                le64_to_cpu(ext->e_start), prev_end);
2019                         RETURN(-EINVAL);
2020                 }
2021
2022                 tmp.lb_buf = (char *)comp_v1 + le32_to_cpu(ent->lcme_offset);
2023                 tmp.lb_len = le32_to_cpu(ent->lcme_size);
2024
2025                 /* Check DoM entry is always the first one */
2026                 lum = tmp.lb_buf;
2027                 if (lov_pattern(le32_to_cpu(lum->lmm_pattern)) ==
2028                     LOV_PATTERN_MDT) {
2029                         /* DoM component must be the first in a mirror */
2030                         if (le64_to_cpu(ext->e_start) > 0) {
2031                                 CDEBUG(D_LAYOUT, "invalid DoM component "
2032                                        "with %llu extent start\n",
2033                                        le64_to_cpu(ext->e_start));
2034                                 RETURN(-EINVAL);
2035                         }
2036                         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2037                         /* There is just one stripe on MDT and it must
2038                          * cover whole component size. */
2039                         if (stripe_size != le64_to_cpu(ext->e_end)) {
2040                                 CDEBUG(D_LAYOUT, "invalid DoM layout "
2041                                        "stripe size %u != %llu "
2042                                        "(component size)\n",
2043                                        stripe_size, prev_end);
2044                                 RETURN(-EINVAL);
2045                         }
2046                         /* Check and adjust stripe size by per-MDT limit */
2047                         rc = lod_dom_stripesize_choose(env, d, comp_v1, ent,
2048                                                        stripe_size);
2049                         /* DoM entry was removed, re-check layout from start */
2050                         if (rc == -ERESTART)
2051                                 goto recheck;
2052                         else if (rc)
2053                                 RETURN(rc);
2054
2055                         /* Any stripe count is forbidden on DoM component */
2056                         if (lum->lmm_stripe_count) {
2057                                 CDEBUG(D_LAYOUT,
2058                                        "invalid DoM layout stripe count %u, must be 0\n",
2059                                        le16_to_cpu(lum->lmm_stripe_count));
2060                                 RETURN(-EINVAL);
2061                         }
2062
2063                         /* Any pool is forbidden on DoM component */
2064                         if (lum->lmm_magic == LOV_USER_MAGIC_V3) {
2065                                 struct lov_user_md_v3 *v3 = (void *)lum;
2066
2067                                 if (v3->lmm_pool_name[0] != '\0') {
2068                                         CDEBUG(D_LAYOUT,
2069                                                "DoM component cannot have pool assigned\n");
2070                                         RETURN(-EINVAL);
2071                                 }
2072                         }
2073                 }
2074
2075                 prev_end = le64_to_cpu(ext->e_end);
2076
2077                 rc = lod_verify_v1v3(d, &tmp, is_from_disk);
2078                 if (rc)
2079                         RETURN(rc);
2080
2081                 if (prev_end == LUSTRE_EOF || ext->e_start == prev_end)
2082                         continue;
2083
2084                 /* extent end must be aligned with the stripe_size */
2085                 stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2086                 if (stripe_size && prev_end % stripe_size) {
2087                         CDEBUG(D_LAYOUT, "stripe size isn't aligned, "
2088                                "stripe_sz: %u, [%llu, %llu)\n",
2089                                stripe_size, ext->e_start, prev_end);
2090                         RETURN(-EINVAL);
2091                 }
2092         }
2093
2094         /* make sure that the mirror_count is telling the truth */
2095         if (mirror_count != le16_to_cpu(comp_v1->lcm_mirror_count) + 1)
2096                 RETURN(-EINVAL);
2097
2098         RETURN(0);
2099 }
2100
2101 /**
2102  * set the default stripe size, if unset.
2103  *
2104  * \param[in,out] val   number of bytes per OST stripe
2105  *
2106  * The minimum stripe size is 64KB to ensure that a single stripe is an
2107  * even multiple of a client PAGE_SIZE (IA64, PPC, etc).  Otherwise, it
2108  * is difficult to split dirty pages across OSCs during writes.
2109  */
2110 void lod_fix_desc_stripe_size(__u64 *val)
2111 {
2112         if (*val < LOV_MIN_STRIPE_SIZE) {
2113                 if (*val != 0)
2114                         LCONSOLE_INFO("Increasing default stripe size to "
2115                                       "minimum value %u\n",
2116                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
2117                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
2118         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
2119                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
2120                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
2121                               "multiple of %u)\n",
2122                               *val, LOV_MIN_STRIPE_SIZE);
2123         }
2124 }
2125
2126 /**
2127  * set the filesystem default number of stripes, if unset.
2128  *
2129  * \param[in,out] val   number of stripes
2130  *
2131  * A value of "0" means "use the system-wide default stripe count", which
2132  * has either been inherited by now, or falls back to 1 stripe per file.
2133  * A value of "-1" (0xffffffff) means "stripe over all available OSTs",
2134  * and is a valid value, so is left unchanged here.
2135  */
2136 void lod_fix_desc_stripe_count(__u32 *val)
2137 {
2138         if (*val == 0)
2139                 *val = 1;
2140 }
2141
2142 /**
2143  * set the filesystem default layout pattern
2144  *
2145  * \param[in,out] val   LOV_PATTERN_* layout
2146  *
2147  * A value of "0" means "use the system-wide default layout type", which
2148  * has either been inherited by now, or falls back to plain RAID0 striping.
2149  */
2150 void lod_fix_desc_pattern(__u32 *val)
2151 {
2152         /* from lov_setstripe */
2153         if ((*val != 0) && !lov_pattern_supported_normal_comp(*val)) {
2154                 LCONSOLE_WARN("lod: Unknown stripe pattern: %#x\n", *val);
2155                 *val = 0;
2156         }
2157 }
2158
2159 void lod_fix_lmv_desc_pattern(__u32 *val)
2160 {
2161         if ((*val) && !lmv_is_known_hash_type(*val)) {
2162                 LCONSOLE_WARN("lod: Unknown md stripe pattern: %#x\n", *val);
2163                 *val = 0;
2164         }
2165 }
2166
2167 void lod_fix_desc_qos_maxage(__u32 *val)
2168 {
2169         /* fix qos_maxage */
2170         if (*val == 0)
2171                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
2172 }
2173
2174 /**
2175  * Used to fix insane default striping.
2176  *
2177  * \param[in] desc      striping description
2178  */
2179 void lod_fix_desc(struct lov_desc *desc)
2180 {
2181         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
2182         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2183         lod_fix_desc_pattern(&desc->ld_pattern);
2184         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2185 }
2186
2187 static void lod_fix_lmv_desc(struct lmv_desc *desc)
2188 {
2189         desc->ld_active_tgt_count = 0;
2190         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2191         lod_fix_lmv_desc_pattern(&desc->ld_pattern);
2192         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2193 }
2194
2195 /**
2196  * Initialize the structures used to store pools and default striping.
2197  *
2198  * \param[in] lod       LOD device
2199  * \param[in] lcfg      configuration structure storing default striping.
2200  *
2201  * \retval              0 if initialization succeeds
2202  * \retval              negative error number on failure
2203  */
2204 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
2205 {
2206         struct obd_device          *obd;
2207         struct lov_desc            *desc;
2208         int                         rc;
2209         ENTRY;
2210
2211         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
2212         LASSERT(obd != NULL);
2213         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
2214
2215         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
2216                 CERROR("LOD setup requires a descriptor\n");
2217                 RETURN(-EINVAL);
2218         }
2219
2220         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
2221
2222         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
2223                 CERROR("descriptor size wrong: %d > %d\n",
2224                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
2225                 RETURN(-EINVAL);
2226         }
2227
2228         if (desc->ld_magic != LOV_DESC_MAGIC) {
2229                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
2230                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
2231                                obd->obd_name, desc);
2232                         lustre_swab_lov_desc(desc);
2233                 } else {
2234                         CERROR("%s: Bad lov desc magic: %#x\n",
2235                                obd->obd_name, desc->ld_magic);
2236                         RETURN(-EINVAL);
2237                 }
2238         }
2239
2240         lod_fix_desc(desc);
2241
2242         desc->ld_active_tgt_count = 0;
2243         lod->lod_ost_descs.ltd_lov_desc = *desc;
2244
2245         /* NB: config doesn't contain lmv_desc, alter it via sysfs. */
2246         lod_fix_lmv_desc(&lod->lod_mdt_descs.ltd_lmv_desc);
2247
2248         lod->lod_sp_me = LUSTRE_SP_CLI;
2249
2250         /* Set up OST pool environment */
2251         lod->lod_pool_count = 0;
2252         rc = lod_pool_hash_init(&lod->lod_pools_hash_body);
2253         if (rc)
2254                 RETURN(-ENOMEM);
2255
2256         INIT_LIST_HEAD(&lod->lod_pool_list);
2257         lod->lod_pool_count = 0;
2258         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_tgt_pool, 0);
2259         if (rc)
2260                 GOTO(out_hash, rc);
2261
2262         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool, 0);
2263         if (rc)
2264                 GOTO(out_mdt_pool, rc);
2265
2266         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_tgt_pool, 0);
2267         if (rc)
2268                 GOTO(out_mdt_rr_pool, rc);
2269
2270         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool, 0);
2271         if (rc)
2272                 GOTO(out_ost_pool, rc);
2273
2274         RETURN(0);
2275
2276 out_ost_pool:
2277         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2278 out_mdt_rr_pool:
2279         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2280 out_mdt_pool:
2281         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2282 out_hash:
2283         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2284
2285         return rc;
2286 }
2287
2288 /**
2289  * Release the structures describing the pools.
2290  *
2291  * \param[in] lod       LOD device from which we release the structures
2292  *
2293  * \retval              0 always
2294  */
2295 int lod_pools_fini(struct lod_device *lod)
2296 {
2297         struct obd_device   *obd = lod2obd(lod);
2298         struct pool_desc    *pool, *tmp;
2299         ENTRY;
2300
2301         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
2302                 /* free pool structs */
2303                 CDEBUG(D_INFO, "delete pool %p\n", pool);
2304                 /* In the function below, .hs_keycmp resolves to
2305                  * pool_hashkey_keycmp() */
2306                 /* coverity[overrun-buffer-val] */
2307                 lod_pool_del(obd, pool->pool_name);
2308         }
2309
2310         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2311         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool);
2312         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2313         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2314         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2315
2316         RETURN(0);
2317 }