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         lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 749         stripe_count = lod_comp_entry_stripe_count(lo, comp_idx, is_dir);
 750         if (stripe_count == 0 && !is_dir &&
 751             !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
 752             !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
 753                 /* Try again if all active targets are disconnected.
 754                  * It is possible when MDS does failover. */
 755                 if (!lod->lod_ost_active_count &&
 756                     lod->lod_ost_count)
 757                         RETURN(-EAGAIN);
 758                 RETURN(-E2BIG);
 759         }
 760
 761         if (!is_dir && lo->ldo_is_composite)
 762                 lod_comp_shrink_stripe_count(lod_comp, &stripe_count);
 763
 764         if (is_dir || lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED)
 765                 GOTO(done, rc = 0);
 766
 767         /* generate ost_idx of this component stripe */
 768         for (i = 0; i < stripe_count; i++) {
 769                 struct dt_object *object;
 770                 __u32 ost_idx = (__u32)-1UL;
 771                 int type = LU_SEQ_RANGE_OST;
 772
 773                 if (lod_comp->llc_stripe && lod_comp->llc_stripe[i]) {
 774                         object = lod_comp->llc_stripe[i];
 775                         /* instantiated component */
 776                         info->lti_fid = *lu_object_fid(&object->do_lu);
 777
 778                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF) &&
 779                             comp_idx == 0) {
 780                                 if (cfs_fail_val == 0)
 781                                         cfs_fail_val = info->lti_fid.f_oid;
 782                                 else if (i == 0)
 783                                         info->lti_fid.f_oid = cfs_fail_val;
 784                         }
 785
 786                         rc = fid_to_ostid(&info->lti_fid, &info->lti_ostid);
 787                         LASSERT(rc == 0);
 788
 789                         ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 790                         objs[i].l_ost_gen = cpu_to_le32(0);
 791                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FLD_LOOKUP))
 792                                 rc = -ENOENT;
 793                         else
 794                                 rc = lod_fld_lookup(env, lod, &info->lti_fid,
 795                                                     &ost_idx, &type);
 796                         if (rc < 0) {
 797                                 CERROR("%s: Can not locate "DFID": rc = %d\n",
 798                                        lod2obd(lod)->obd_name,
 799                                        PFID(&info->lti_fid), rc);
 800                                 RETURN(rc);
 801                         }
 802                 } else if (lod_comp->llc_ostlist.op_array &&
 803                            lod_comp->llc_ostlist.op_count) {
 804                         /* user specified ost list */
 805                         ost_idx = lod_comp->llc_ostlist.op_array[i];
 806                 }
 807                 /*
 808                  * with un-instantiated or with no specified ost list
 809                  * component, its l_ost_idx does not matter.
 810                  */
 811                 objs[i].l_ost_idx = cpu_to_le32(ost_idx);
 812         }
 813 done:
 814         if (lmm_size != NULL)
 815                 *lmm_size = lov_mds_md_size(stripe_count, magic);
 816         RETURN(rc);
 817 }
 818
 819 /**
 820  * Generate on-disk lov_mds_md structure based on the information in
 821  * the lod_object->ldo_comp_entries.
 822  *
 823  * \param[in] env               execution environment for this thread
 824  * \param[in] lo                LOD object
 825  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 826  * \param[in|out] lmm_size      buffer size/lmm size
 827  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 828  *                              the stripe info is from the default stripe
 829  *                              template, which is collected in lod_ah_init(),
 830  *                              either from parent object or root object; for
 831  *                              file case, it's from the @lo object
 832  *
 833  * \retval                      0 if on disk structure is created successfully
 834  * \retval                      negative error number on failure
 835  */
 836 int lod_generate_lovea(const struct lu_env *env, struct lod_object *lo,
 837                        struct lov_mds_md *lmm, int *lmm_size, bool is_dir)
 838 {
 839         struct lov_comp_md_entry_v1 *lcme;
 840         struct lov_comp_md_v1 *lcm;
 841         struct lod_layout_component *comp_entries;
 842         __u16 comp_cnt, mirror_cnt;
 843         bool is_composite, is_foreign = false;
 844         int i, rc = 0, offset;
 845         ENTRY;
 846
 847         if (is_dir) {
 848                 comp_cnt = lo->ldo_def_striping->lds_def_comp_cnt;
 849                 mirror_cnt = lo->ldo_def_striping->lds_def_mirror_cnt;
 850                 comp_entries = lo->ldo_def_striping->lds_def_comp_entries;
 851                 is_composite =
 852                         lo->ldo_def_striping->lds_def_striping_is_composite;
 853         } else {
 854                 comp_cnt = lo->ldo_comp_cnt;
 855                 mirror_cnt = lo->ldo_mirror_count;
 856                 comp_entries = lo->ldo_comp_entries;
 857                 is_composite = lo->ldo_is_composite;
 858                 is_foreign = lo->ldo_is_foreign;
 859         }
 860
 861         LASSERT(lmm_size != NULL);
 862
 863         if (is_foreign) {
 864                 struct lov_foreign_md *lfm;
 865
 866                 lfm = (struct lov_foreign_md *)lmm;
 867                 memcpy(lfm, lo->ldo_foreign_lov, lo->ldo_foreign_lov_size);
 868                 /* need to store little-endian */
 869                 if (cpu_to_le32(LOV_MAGIC_FOREIGN) != LOV_MAGIC_FOREIGN) {
 870                         __swab32s(&lfm->lfm_magic);
 871                         __swab32s(&lfm->lfm_length);
 872                         __swab32s(&lfm->lfm_type);
 873                         __swab32s(&lfm->lfm_flags);
 874                 }
 875                 *lmm_size = lo->ldo_foreign_lov_size;
 876                 RETURN(0);
 877         }
 878
 879         LASSERT(comp_cnt != 0 && comp_entries != NULL);
 880
 881         if (!is_composite) {
 882                 rc = lod_gen_component_ea(env, lo, 0, lmm, lmm_size, is_dir);
 883                 RETURN(rc);
 884         }
 885
 886         lcm = (struct lov_comp_md_v1 *)lmm;
 887         memset(lcm, 0, sizeof(*lcm));
 888
 889         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_COMP_V1);
 890         lcm->lcm_entry_count = cpu_to_le16(comp_cnt);
 891         lcm->lcm_mirror_count = cpu_to_le16(mirror_cnt - 1);
 892         lcm->lcm_flags = cpu_to_le16(lo->ldo_flr_state);
 893
 894         offset = sizeof(*lcm) + sizeof(*lcme) * comp_cnt;
 895         LASSERT(offset % sizeof(__u64) == 0);
 896
 897         for (i = 0; i < comp_cnt; i++) {
 898                 struct lod_layout_component *lod_comp;
 899                 struct lov_mds_md *sub_md;
 900                 int size;
 901
 902                 lod_comp = &comp_entries[i];
 903                 lcme = &lcm->lcm_entries[i];
 904
 905                 LASSERT(ergo(!is_dir, lod_comp->llc_id != LCME_ID_INVAL));
 906                 lcme->lcme_id = cpu_to_le32(lod_comp->llc_id);
 907
 908                 /* component could be un-inistantiated */
 909                 lcme->lcme_flags = cpu_to_le32(lod_comp->llc_flags);
 910                 if (lod_comp->llc_flags & LCME_FL_NOSYNC)
 911                         lcme->lcme_timestamp =
 912                                 cpu_to_le64(lod_comp->llc_timestamp);
 913                 if (lod_comp->llc_flags & LCME_FL_EXTENSION && !is_dir)
 914                         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_SEL);
 915
 916                 lcme->lcme_extent.e_start =
 917                         cpu_to_le64(lod_comp->llc_extent.e_start);
 918                 lcme->lcme_extent.e_end =
 919                         cpu_to_le64(lod_comp->llc_extent.e_end);
 920                 lcme->lcme_offset = cpu_to_le32(offset);
 921
 922                 sub_md = (struct lov_mds_md *)((char *)lcm + offset);
 923                 rc = lod_gen_component_ea(env, lo, i, sub_md, &size, is_dir);
 924                 if (rc)
 925                         GOTO(out, rc);
 926                 lcme->lcme_size = cpu_to_le32(size);
 927                 offset += size;
 928                 LASSERTF((offset <= *lmm_size) && (offset % sizeof(__u64) == 0),
 929                          "offset:%d lmm_size:%d\n", offset, *lmm_size);
 930         }
 931         lcm->lcm_size = cpu_to_le32(offset);
 932         lcm->lcm_layout_gen = cpu_to_le32(is_dir ? 0 : lo->ldo_layout_gen);
 933
 934         lustre_print_user_md(D_LAYOUT, (struct lov_user_md *)lmm,
 935                              "generate lum");
 936 out:
 937         if (rc == 0)
 938                 *lmm_size = offset;
 939         RETURN(rc);
 940 }
 941
 942 /**
 943  * Get LOV EA.
 944  *
 945  * Fill lti_ea_store buffer in the environment with a value for the given
 946  * EA. The buffer is reallocated if the value doesn't fit.
 947  *
 948  * \param[in,out] env           execution environment for this thread
 949  *                              .lti_ea_store buffer is filled with EA's value
 950  * \param[in] lo                LOD object
 951  * \param[in] name              name of the EA
 952  *
 953  * \retval                      > 0 if EA is fetched successfully
 954  * \retval                      0 if EA is empty
 955  * \retval                      negative error number on failure
 956  */
 957 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
 958                const char *name)
 959 {
 960         struct lod_thread_info  *info = lod_env_info(env);
 961         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 962         int                     rc;
 963         ENTRY;
 964
 965         LASSERT(info);
 966
 967         if (unlikely(info->lti_ea_store == NULL)) {
 968                 /* just to enter in allocation block below */
 969                 rc = -ERANGE;
 970         } else {
 971 repeat:
 972                 info->lti_buf.lb_buf = info->lti_ea_store;
 973                 info->lti_buf.lb_len = info->lti_ea_store_size;
 974                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
 975         }
 976
 977         /* if object is not striped or inaccessible */
 978         if (rc == -ENODATA || rc == -ENOENT)
 979                 RETURN(0);
 980
 981         if (rc == -ERANGE) {
 982                 /* EA doesn't fit, reallocate new buffer */
 983                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
 984                 if (rc == -ENODATA || rc == -ENOENT)
 985                         RETURN(0);
 986                 else if (rc < 0)
 987                         RETURN(rc);
 988
 989                 LASSERT(rc > 0);
 990                 rc = lod_ea_store_resize(info, rc);
 991                 if (rc)
 992                         RETURN(rc);
 993                 goto repeat;
 994         }
 995
 996         RETURN(rc);
 997 }
 998
 999 /**
1000  * Verify the target index is present in the current configuration.
1001  *
1002  * \param[in] md                LOD device where the target table is stored
1003  * \param[in] idx               target's index
1004  *
1005  * \retval                      0 if the index is present
1006  * \retval                      -EINVAL if not
1007  */
1008 int validate_lod_and_idx(struct lod_device *md, __u32 idx)
1009 {
1010         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
1011                      !test_bit(idx, md->lod_ost_bitmap))) {
1012                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
1013                        md->lod_ost_descs.ltd_tgts_size);
1014                 return -EINVAL;
1015         }
1016
1017         if (unlikely(OST_TGT(md, idx) == NULL)) {
1018                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
1019                        lod2obd(md)->obd_name, idx);
1020                 return -EINVAL;
1021         }
1022
1023         if (unlikely(OST_TGT(md, idx)->ltd_tgt == NULL)) {
1024                 CERROR("%s: invalid lod device, for idx: %d\n",
1025                        lod2obd(md)->obd_name , idx);
1026                 return -EINVAL;
1027         }
1028
1029         return 0;
1030 }
1031
1032 /**
1033  * Instantiate objects for stripes.
1034  *
1035  * Allocate and initialize LU-objects representing the stripes. The number
1036  * of the stripes (ldo_stripe_count) must be initialized already. The caller
1037  * must ensure nobody else is calling the function on the object at the same
1038  * time. FLDB service must be running to be able to map a FID to the targets
1039  * and find appropriate device representing that target.
1040  *
1041  * \param[in] env               execution environment for this thread
1042  * \param[in,out] lo            LOD object
1043  * \param[in] objs              an array of IDs to creates the objects from
1044  * \param[in] comp_idx          index of ldo_comp_entries
1045  *
1046  * \retval                      0 if the objects are instantiated successfully
1047  * \retval                      negative error number on failure
1048  */
1049 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
1050                            struct lov_ost_data_v1 *objs, int comp_idx)
1051 {
1052         struct lod_layout_component *lod_comp;
1053         struct lod_thread_info *info = lod_env_info(env);
1054         struct lod_device *md;
1055         struct lu_object *o, *n;
1056         struct lu_device *nd;
1057         struct dt_object **stripe = NULL;
1058         __u32 *ost_indices = NULL;
1059         int stripe_len;
1060         int i, rc = 0;
1061         __u32 idx;
1062         ENTRY;
1063
1064         LASSERT(lo != NULL);
1065         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1066
1067         LASSERT(lo->ldo_comp_cnt != 0 && lo->ldo_comp_entries != NULL);
1068         lod_comp = &lo->ldo_comp_entries[comp_idx];
1069
1070         LASSERT(lod_comp->llc_stripe == NULL);
1071         LASSERT(lod_comp->llc_stripe_count > 0);
1072         LASSERT(lod_comp->llc_stripe_size > 0);
1073
1074         stripe_len = lod_comp->llc_stripe_count;
1075         OBD_ALLOC_PTR_ARRAY(stripe, stripe_len);
1076         if (stripe == NULL)
1077                 RETURN(-ENOMEM);
1078         OBD_ALLOC_PTR_ARRAY(ost_indices, stripe_len);
1079         if (!ost_indices)
1080                 GOTO(out, rc = -ENOMEM);
1081
1082         for (i = 0; i < lod_comp->llc_stripe_count; i++) {
1083                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
1084                         continue;
1085
1086                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
1087                 idx = le32_to_cpu(objs[i].l_ost_idx);
1088                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
1089                 if (rc != 0)
1090                         GOTO(out, rc);
1091                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
1092                          PFID(&info->lti_fid));
1093                 lod_getref(&md->lod_ost_descs);
1094
1095                 rc = validate_lod_and_idx(md, idx);
1096                 if (unlikely(rc != 0)) {
1097                         lod_putref(md, &md->lod_ost_descs);
1098                         GOTO(out, rc);
1099                 }
1100
1101                 nd = &OST_TGT(md, idx)->ltd_tgt->dd_lu_dev;
1102                 lod_putref(md, &md->lod_ost_descs);
1103
1104                 /* In the function below, .hs_keycmp resolves to
1105                  * u_obj_hop_keycmp() */
1106                 /* coverity[overrun-buffer-val] */
1107                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
1108                 if (IS_ERR(o))
1109                         GOTO(out, rc = PTR_ERR(o));
1110
1111                 n = lu_object_locate(o->lo_header, nd->ld_type);
1112                 LASSERT(n);
1113
1114                 stripe[i] = container_of(n, struct dt_object, do_lu);
1115                 ost_indices[i] = idx;
1116         }
1117
1118 out:
1119         if (rc != 0) {
1120                 for (i = 0; i < stripe_len; i++)
1121                         if (stripe[i] != NULL)
1122                                 dt_object_put(env, stripe[i]);
1123
1124                 OBD_FREE_PTR_ARRAY(stripe, stripe_len);
1125                 lod_comp->llc_stripe_count = 0;
1126                 if (ost_indices)
1127                         OBD_FREE_PTR_ARRAY(ost_indices, stripe_len);
1128         } else {
1129                 lod_comp->llc_stripe = stripe;
1130                 lod_comp->llc_ost_indices = ost_indices;
1131                 lod_comp->llc_stripes_allocated = stripe_len;
1132         }
1133
1134         RETURN(rc);
1135 }
1136
1137 /**
1138  * Instantiate objects for striping.
1139  *
1140  * Parse striping information in \a buf and instantiate the objects
1141  * representing the stripes.
1142  *
1143  * \param[in] env               execution environment for this thread
1144  * \param[in] lo                LOD object
1145  * \param[in] buf               buffer storing LOV EA to parse
1146  * \param[in] lvf               verify flags when parsing the layout
1147  *
1148  * \retval                      0 if parsing and objects creation succeed
1149  * \retval                      negative error number on failure
1150  */
1151 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
1152                        const struct lu_buf *buf, enum layout_verify_flags lvf)
1153 {
1154         struct lod_device *d = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1155         struct lov_mds_md_v1 *lmm;
1156         struct lov_comp_md_v1 *comp_v1 = NULL;
1157         struct lov_foreign_md *foreign = NULL;
1158         struct lov_ost_data_v1 *objs;
1159         __u32 magic, pattern;
1160         __u16 mirror_cnt = 0;
1161         __u16 comp_cnt;
1162         int i, rc;
1163         __u16 mirror_id = MIRROR_ID_NEG;
1164         bool stale = false;
1165         int stale_mirrors = 0;
1166         ENTRY;
1167
1168         LASSERT(buf);
1169         LASSERT(buf->lb_buf);
1170         LASSERT(buf->lb_len);
1171         LASSERT(mutex_is_locked(&lo->ldo_layout_mutex));
1172
1173         lmm = (struct lov_mds_md_v1 *)buf->lb_buf;
1174         magic = le32_to_cpu(lmm->lmm_magic);
1175
1176         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3 &&
1177             magic != LOV_MAGIC_COMP_V1 && magic != LOV_MAGIC_FOREIGN &&
1178             magic != LOV_MAGIC_SEL)
1179                 GOTO(out, rc = -EINVAL);
1180
1181         lod_striping_free_nolock(env, lo);
1182
1183         if (magic == LOV_MAGIC_COMP_V1 || magic == LOV_MAGIC_SEL) {
1184                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
1185                 comp_cnt = le16_to_cpu(comp_v1->lcm_entry_count);
1186                 if (comp_cnt == 0)
1187                         GOTO(out, rc = -EINVAL);
1188                 lo->ldo_layout_gen = le32_to_cpu(comp_v1->lcm_layout_gen);
1189                 lo->ldo_is_composite = 1;
1190                 mirror_cnt = le16_to_cpu(comp_v1->lcm_mirror_count) + 1;
1191                 if (mirror_cnt > 1)
1192                         lo->ldo_flr_state = le16_to_cpu(comp_v1->lcm_flags) &
1193                                                         LCM_FL_FLR_MASK;
1194                 else
1195                         lo->ldo_flr_state = LCM_FL_NONE;
1196         } else if (magic == LOV_MAGIC_FOREIGN) {
1197                 size_t length;
1198
1199                 foreign = (struct lov_foreign_md *)buf->lb_buf;
1200                 length = offsetof(typeof(*foreign), lfm_value);
1201                 if (buf->lb_len < length ||
1202                     buf->lb_len < (length + le32_to_cpu(foreign->lfm_length))) {
1203                         CDEBUG(D_LAYOUT,
1204                                "buf len %zu too small for lov_foreign_md\n",
1205                                buf->lb_len);
1206                         GOTO(out, rc = -EINVAL);
1207                 }
1208
1209                 /* just cache foreign LOV EA raw */
1210                 rc = lod_alloc_foreign_lov(lo, length);
1211                 if (rc)
1212                         GOTO(out, rc);
1213                 memcpy(lo->ldo_foreign_lov, buf->lb_buf, length);
1214                 GOTO(out, rc);
1215         } else {
1216                 comp_cnt = 1;
1217                 lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1218                 lo->ldo_is_composite = 0;
1219         }
1220
1221         rc = lod_alloc_comp_entries(lo, mirror_cnt, comp_cnt);
1222         if (rc)
1223                 GOTO(out, rc);
1224
1225         for (i = 0; i < comp_cnt; i++) {
1226                 struct lod_layout_component *lod_comp;
1227                 struct lu_extent *ext;
1228                 __u32 offs;
1229
1230                 lod_comp = &lo->ldo_comp_entries[i];
1231                 if (lo->ldo_is_composite) {
1232                         offs = le32_to_cpu(comp_v1->lcm_entries[i].lcme_offset);
1233                         lmm = (struct lov_mds_md_v1 *)((char *)comp_v1 + offs);
1234
1235                         ext = &comp_v1->lcm_entries[i].lcme_extent;
1236                         lod_comp->llc_extent.e_start =
1237                                 le64_to_cpu(ext->e_start);
1238                         if (lod_comp->llc_extent.e_start &
1239                             (LOV_MIN_STRIPE_SIZE - 1)) {
1240                                 CDEBUG(D_LAYOUT,
1241                                        "extent start %llu is not a multiple of min size %u\n",
1242                                        lod_comp->llc_extent.e_start,
1243                                        LOV_MIN_STRIPE_SIZE);
1244                                 GOTO(out, rc = -EINVAL);
1245                         }
1246
1247                         lod_comp->llc_extent.e_end = le64_to_cpu(ext->e_end);
1248                         if (lod_comp->llc_extent.e_end != LUSTRE_EOF &&
1249                             lod_comp->llc_extent.e_end &
1250                             (LOV_MIN_STRIPE_SIZE - 1)) {
1251                                 CDEBUG(D_LAYOUT,
1252                                        "extent end %llu is not a multiple of min size %u\n",
1253                                        lod_comp->llc_extent.e_end,
1254                                        LOV_MIN_STRIPE_SIZE);
1255                                 GOTO(out, rc = -EINVAL);
1256                         }
1257
1258                         lod_comp->llc_flags =
1259                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_flags);
1260
1261                         if (lod_comp->llc_flags & LCME_FL_NOSYNC)
1262                                 lod_comp->llc_timestamp = le64_to_cpu(
1263                                         comp_v1->lcm_entries[i].lcme_timestamp);
1264                         lod_comp->llc_id =
1265                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_id);
1266                         if (lod_comp->llc_id == LCME_ID_INVAL)
1267                                 GOTO(out, rc = -EINVAL);
1268
1269                         if (lvf & LVF_ALL_STALE) {
1270                                 if (mirror_id_of(lod_comp->llc_id) ==
1271                                     mirror_id) {
1272                                         /* remaining comps in the mirror */
1273                                         stale |= lod_comp->llc_flags &
1274                                                  LCME_FL_STALE;
1275                                 } else {
1276                                         /*
1277                                          * new mirror, check last mirror's
1278                                          * stale-ness
1279                                          */
1280                                         if (stale)
1281                                                 stale_mirrors++;
1282
1283                                         mirror_id =
1284                                                 mirror_id_of(lod_comp->llc_id);
1285
1286                                         /* the first comp of the new mirror */
1287                                         stale = lod_comp->llc_flags &
1288                                                 LCME_FL_STALE;
1289                                 }
1290                         }
1291
1292                         if ((lod_comp->llc_flags & LCME_FL_EXTENSION) &&
1293                             comp_v1->lcm_magic != cpu_to_le32(LOV_MAGIC_SEL)) {
1294                                 CWARN("%s: EXTENSION flags=%x set on component[%u]=%x of non-SEL file "DFID" with magic=%#08x\n",
1295                                       lod2obd(d)->obd_name,
1296                                       lod_comp->llc_flags, lod_comp->llc_id, i,
1297                                       PFID(lod_object_fid(lo)),
1298                                       le32_to_cpu(comp_v1->lcm_magic));
1299                         }
1300                 } else {
1301                         lod_comp_set_init(lod_comp);
1302                 }
1303
1304                 pattern = le32_to_cpu(lmm->lmm_pattern);
1305                 if (!lov_pattern_supported(lov_pattern(pattern)))
1306                         GOTO(out, rc = -EINVAL);
1307
1308                 lod_comp->llc_pattern = pattern;
1309                 lod_comp->llc_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
1310                 lod_comp->llc_stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
1311                 lod_comp->llc_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1312
1313                 if (lmm->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)) {
1314                         struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
1315
1316                         lod_set_pool(&lod_comp->llc_pool, v3->lmm_pool_name);
1317                         objs = &v3->lmm_objects[0];
1318                 } else {
1319                         lod_set_pool(&lod_comp->llc_pool, NULL);
1320                         objs = &lmm->lmm_objects[0];
1321                 }
1322
1323                 /**
1324                  * If uninstantiated template component has valid l_ost_idx,
1325                  * then user has specified ost list for this component.
1326                  */
1327                 if (!lod_comp_inited(lod_comp)) {
1328                         __u16 stripe_count;
1329
1330                         if (objs[0].l_ost_idx != (__u32)-1UL) {
1331                                 int j;
1332
1333                                 stripe_count = lod_comp_entry_stripe_count(
1334                                                         lo, i, false);
1335                                 if (stripe_count == 0 &&
1336                                     !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1337                                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT))
1338                                         GOTO(out, rc = -E2BIG);
1339                                 /**
1340                                  * load the user specified ost list, when this
1341                                  * component is instantiated later, it will be
1342                                  * used in lod_alloc_ost_list().
1343                                  */
1344                                 lod_comp->llc_ostlist.op_count = stripe_count;
1345                                 lod_comp->llc_ostlist.op_size =
1346                                         stripe_count * sizeof(__u32);
1347                                 OBD_ALLOC(lod_comp->llc_ostlist.op_array,
1348                                           lod_comp->llc_ostlist.op_size);
1349                                 if (!lod_comp->llc_ostlist.op_array)
1350                                         GOTO(out, rc = -ENOMEM);
1351
1352                                 for (j = 0; j < stripe_count; j++)
1353                                         lod_comp->llc_ostlist.op_array[j] =
1354                                                 le32_to_cpu(objs[j].l_ost_idx);
1355
1356                                 /**
1357                                  * this component OST objects starts from the
1358                                  * first ost_idx, lod_alloc_ost_list() will
1359                                  * check this.
1360                                  */
1361                                 lod_comp->llc_stripe_offset = objs[0].l_ost_idx;
1362                         } else {
1363                                 /**
1364                                  * for uninstantiated component,
1365                                  * lmm_layout_gen stores default stripe offset.
1366                                  */
1367                                 lod_comp->llc_stripe_offset =
1368                                                         lmm->lmm_layout_gen;
1369                         }
1370                 }
1371
1372                 /* skip un-instantiated component object initialization */
1373                 if (!lod_comp_inited(lod_comp))
1374                         continue;
1375
1376                 if (!(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1377                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
1378                         rc = lod_initialize_objects(env, lo, objs, i);
1379                         if (rc)
1380                                 GOTO(out, rc);
1381                 }
1382         }
1383
1384         if (lo->ldo_is_composite && (lvf & LVF_ALL_STALE)) {
1385                 /* check the last mirror stale-ness */
1386                 if (stale)
1387                         stale_mirrors++;
1388
1389                 if (mirror_cnt == stale_mirrors) {
1390                         rc = -EPERM;
1391                         CERROR("%s: can not set all stale mirrors for "
1392                                DFID": rc = %d\n",
1393                                lod2obd(d)->obd_name, PFID(lod_object_fid(lo)),
1394                                rc);
1395                         GOTO(out, rc);
1396                 }
1397         }
1398
1399         rc = lod_fill_mirrors(lo);
1400         if (rc)
1401                 GOTO(out, rc);
1402
1403 out:
1404         if (rc)
1405                 lod_striping_free_nolock(env, lo);
1406         RETURN(rc);
1407 }
1408
1409 /**
1410  * Check whether the striping (LOVEA for regular file, LMVEA for directory)
1411  * is already cached.
1412  *
1413  * \param[in] lo        LOD object
1414  *
1415  * \retval              True if the striping is cached, otherwise
1416  *                      return false.
1417  */
1418 static bool lod_striping_loaded(struct lod_object *lo)
1419 {
1420         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1421             lo->ldo_comp_cached)
1422                 return true;
1423
1424         if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1425                 if (lo->ldo_dir_stripe_loaded)
1426                         return true;
1427
1428                 /* Never load LMV stripe for slaves of striped dir */
1429                 if (lo->ldo_dir_slave_stripe)
1430                         return true;
1431         }
1432
1433         return false;
1434 }
1435
1436 /**
1437  * A generic function to initialize the stripe objects.
1438  *
1439  * A protected version of lod_striping_load_locked() - load the striping
1440  * information from storage, parse that and instantiate LU objects to
1441  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1442  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1443  * return an array of references to the newly instantiated objects.
1444  *
1445  * \param[in] env               execution environment for this thread
1446  * \param[in,out] lo            LOD object, where striping is stored and
1447  *                              which gets an array of references
1448  *
1449  * \retval                      0 if parsing and object creation succeed
1450  * \retval                      negative error number on failure
1451  **/
1452 int lod_striping_load(const struct lu_env *env, struct lod_object *lo)
1453 {
1454         struct lod_thread_info *info = lod_env_info(env);
1455         struct dt_object *next = dt_object_child(&lo->ldo_obj);
1456         struct lu_buf *buf = &info->lti_buf;
1457         int rc = 0;
1458
1459         ENTRY;
1460
1461         if (!dt_object_exists(next))
1462                 RETURN(0);
1463
1464         if (lod_striping_loaded(lo))
1465                 RETURN(0);
1466
1467         mutex_lock(&lo->ldo_layout_mutex);
1468         if (lod_striping_loaded(lo))
1469                 GOTO(unlock, rc = 0);
1470
1471         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr)) {
1472                 rc = lod_get_lov_ea(env, lo);
1473                 if (rc <= 0)
1474                         GOTO(unlock, rc);
1475
1476                 /*
1477                  * there is LOV EA (striping information) in this object
1478                  * let's parse it and create in-core objects for the stripes
1479                  */
1480                 buf->lb_buf = info->lti_ea_store;
1481                 buf->lb_len = info->lti_ea_store_size;
1482                 rc = lod_parse_striping(env, lo, buf, 0);
1483                 if (rc == 0)
1484                         lo->ldo_comp_cached = 1;
1485         } else if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1486                 rc = lod_get_lmv_ea(env, lo);
1487                 if (rc > sizeof(struct lmv_foreign_md)) {
1488                         struct lmv_foreign_md *lfm = info->lti_ea_store;
1489
1490                         if (le32_to_cpu(lfm->lfm_magic) == LMV_MAGIC_FOREIGN) {
1491                                 lo->ldo_foreign_lmv = info->lti_ea_store;
1492                                 lo->ldo_foreign_lmv_size =
1493                                         info->lti_ea_store_size;
1494                                 info->lti_ea_store = NULL;
1495                                 info->lti_ea_store_size = 0;
1496
1497                                 lo->ldo_dir_stripe_loaded = 1;
1498                                 lo->ldo_dir_is_foreign = 1;
1499                                 GOTO(unlock, rc = 0);
1500                         }
1501                 }
1502
1503                 if (rc < (int)sizeof(struct lmv_mds_md_v1)) {
1504                         /* Let's set stripe_loaded to avoid further
1505                          * stripe loading especially for non-stripe directory,
1506                          * which can hurt performance. (See LU-9840)
1507                          */
1508                         if (rc == 0)
1509                                 lo->ldo_dir_stripe_loaded = 1;
1510                         GOTO(unlock, rc = rc > 0 ? -EINVAL : rc);
1511                 }
1512                 buf->lb_buf = info->lti_ea_store;
1513                 buf->lb_len = info->lti_ea_store_size;
1514                 if (rc == sizeof(struct lmv_mds_md_v1)) {
1515                         rc = lod_load_lmv_shards(env, lo, buf, true);
1516                         if (buf->lb_buf != info->lti_ea_store) {
1517                                 OBD_FREE_LARGE(info->lti_ea_store,
1518                                                info->lti_ea_store_size);
1519                                 info->lti_ea_store = buf->lb_buf;
1520                                 info->lti_ea_store_size = buf->lb_len;
1521                         }
1522
1523                         if (rc < 0)
1524                                 GOTO(unlock, rc);
1525                 }
1526
1527                 /*
1528                  * there is LMV EA (striping information) in this object
1529                  * let's parse it and create in-core objects for the stripes
1530                  */
1531                 rc = lod_parse_dir_striping(env, lo, buf);
1532                 if (rc == 0)
1533                         lo->ldo_dir_stripe_loaded = 1;
1534         }
1535         EXIT;
1536 unlock:
1537         mutex_unlock(&lo->ldo_layout_mutex);
1538
1539         return rc;
1540 }
1541
1542 int lod_striping_reload(const struct lu_env *env, struct lod_object *lo,
1543                         const struct lu_buf *buf, enum layout_verify_flags lvf)
1544 {
1545         int rc;
1546
1547         ENTRY;
1548
1549         mutex_lock(&lo->ldo_layout_mutex);
1550         rc = lod_parse_striping(env, lo, buf, lvf);
1551         mutex_unlock(&lo->ldo_layout_mutex);
1552
1553         RETURN(rc);
1554 }
1555
1556 /**
1557  * Verify lov_user_md_v1/v3 striping.
1558  *
1559  * Check the validity of all fields including the magic, stripe size,
1560  * stripe count, stripe offset and that the pool is present.  Also check
1561  * that each target index points to an existing target. The additional
1562  * \a is_from_disk turns additional checks. In some cases zero fields
1563  * are allowed (like pattern=0).
1564  *
1565  * \param[in] d                 LOD device
1566  * \param[in] buf               buffer with LOV EA to verify
1567  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1568  *                              1 - from disk, do not allow
1569  *
1570  * \retval                      0 if the striping is valid
1571  * \retval                      -EINVAL if striping is invalid
1572  */
1573 static int lod_verify_v1v3(struct lod_device *d, const struct lu_buf *buf,
1574                            bool is_from_disk)
1575 {
1576         struct lov_user_md_v1   *lum;
1577         struct lov_user_md_v3   *lum3;
1578         struct pool_desc        *pool = NULL;
1579         __u32                    magic;
1580         __u32                    stripe_size;
1581         __u16                    stripe_count;
1582         __u16                    stripe_offset;
1583         size_t                   lum_size;
1584         int                      rc = 0;
1585         ENTRY;
1586
1587         lum = buf->lb_buf;
1588
1589         if (buf->lb_len < sizeof(*lum)) {
1590                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1591                        buf->lb_len);
1592                 GOTO(out, rc = -EINVAL);
1593         }
1594
1595         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1596         if (magic != LOV_USER_MAGIC_V1 &&
1597             magic != LOV_USER_MAGIC_V3 &&
1598             magic != LOV_USER_MAGIC_SPECIFIC) {
1599                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1600                        le32_to_cpu(lum->lmm_magic));
1601                 GOTO(out, rc = -EINVAL);
1602         }
1603
1604         /* the user uses "0" for default stripe pattern normally. */
1605         if (!is_from_disk && lum->lmm_pattern == LOV_PATTERN_NONE)
1606                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1607
1608         if (!lov_pattern_supported(le32_to_cpu(lum->lmm_pattern))) {
1609                 CDEBUG(D_LAYOUT, "bad userland stripe pattern: %#x\n",
1610                        le32_to_cpu(lum->lmm_pattern));
1611                 GOTO(out, rc = -EINVAL);
1612         }
1613
1614         /* a released lum comes from creating orphan on hsm release,
1615          * doesn't make sense to verify it. */
1616         if (le32_to_cpu(lum->lmm_pattern) & LOV_PATTERN_F_RELEASED)
1617                 GOTO(out, rc = 0);
1618
1619         /* 64kB is the largest common page size we see (ia64), and matches the
1620          * check in lfs */
1621         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1622         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1623                 CDEBUG(D_LAYOUT, "stripe size %u not a multiple of %u\n",
1624                        stripe_size, LOV_MIN_STRIPE_SIZE);
1625                 GOTO(out, rc = -EINVAL);
1626         }
1627
1628         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1629         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT &&
1630             lov_pattern(le32_to_cpu(lum->lmm_pattern)) != LOV_PATTERN_MDT) {
1631                 /* if offset is not within valid range [0, osts_size) */
1632                 if (stripe_offset >= d->lod_ost_descs.ltd_tgts_size) {
1633                         CDEBUG(D_LAYOUT, "stripe offset %u >= bitmap size %u\n",
1634                                stripe_offset, d->lod_ost_descs.ltd_tgts_size);
1635                         GOTO(out, rc = -EINVAL);
1636                 }
1637
1638                 /* if lmm_stripe_offset is *not* in bitmap */
1639                 if (!test_bit(stripe_offset, d->lod_ost_bitmap)) {
1640                         CDEBUG(D_LAYOUT, "stripe offset %u not in bitmap\n",
1641                                stripe_offset);
1642                         GOTO(out, rc = -EINVAL);
1643                 }
1644         }
1645
1646         if (magic == LOV_USER_MAGIC_V1)
1647                 lum_size = offsetof(struct lov_user_md_v1,
1648                                     lmm_objects[0]);
1649         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC)
1650                 lum_size = offsetof(struct lov_user_md_v3,
1651                                     lmm_objects[0]);
1652         else
1653                 GOTO(out, rc = -EINVAL);
1654
1655         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1656         if (buf->lb_len < lum_size) {
1657                 CDEBUG(D_LAYOUT, "invalid buf len %zu/%zu for lov_user_md with "
1658                        "magic %#x and stripe_count %u\n",
1659                        buf->lb_len, lum_size, magic, stripe_count);
1660                 GOTO(out, rc = -EINVAL);
1661         }
1662
1663         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC))
1664                 goto out;
1665
1666         lum3 = buf->lb_buf;
1667         /* In the function below, .hs_keycmp resolves to
1668          * pool_hashkey_keycmp() */
1669         /* coverity[overrun-buffer-val] */
1670         pool = lod_find_pool(d, lum3->lmm_pool_name);
1671         if (pool == NULL)
1672                 goto out;
1673
1674         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT) {
1675                 rc = lod_check_index_in_pool(stripe_offset, pool);
1676                 if (rc < 0)
1677                         GOTO(out, rc = -EINVAL);
1678         }
1679
1680         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1681                 CDEBUG(D_LAYOUT, "stripe count %u > # OSTs %u in the pool\n",
1682                        stripe_count, pool_tgt_count(pool));
1683                 GOTO(out, rc = -EINVAL);
1684         }
1685
1686 out:
1687         if (pool != NULL)
1688                 lod_pool_putref(pool);
1689
1690         RETURN(rc);
1691 }
1692
1693 static inline
1694 struct lov_comp_md_entry_v1 *comp_entry_v1(struct lov_comp_md_v1 *comp, int i)
1695 {
1696         LASSERTF((le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1697                  LOV_USER_MAGIC_COMP_V1 ||
1698                  (le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1699                  LOV_USER_MAGIC_SEL, "Wrong magic %x\n",
1700                  le32_to_cpu(comp->lcm_magic));
1701         LASSERTF(i >= 0 && i < le16_to_cpu(comp->lcm_entry_count),
1702                  "bad index %d, max = %d\n",
1703                  i, le16_to_cpu(comp->lcm_entry_count));
1704
1705         return &comp->lcm_entries[i];
1706 }
1707
1708 #define for_each_comp_entry_v1(comp, entry) \
1709         for (entry = comp_entry_v1(comp, 0); \
1710              entry <= comp_entry_v1(comp, \
1711                                    le16_to_cpu(comp->lcm_entry_count) - 1); \
1712              entry++)
1713
1714 int lod_erase_dom_stripe(struct lov_comp_md_v1 *comp_v1,
1715                          struct lov_comp_md_entry_v1 *dom_ent)
1716 {
1717         struct lov_comp_md_entry_v1 *ent;
1718         __u16 entries;
1719         __u32 dom_off, dom_size, comp_size, off;
1720         void *src, *dst;
1721         unsigned int size, shift;
1722
1723         entries = le16_to_cpu(comp_v1->lcm_entry_count) - 1;
1724         LASSERT(entries > 0);
1725         comp_v1->lcm_entry_count = cpu_to_le16(entries);
1726
1727         comp_size = le32_to_cpu(comp_v1->lcm_size);
1728         dom_off = le32_to_cpu(dom_ent->lcme_offset);
1729         dom_size = le32_to_cpu(dom_ent->lcme_size);
1730
1731         /* all entries offsets are shifted by entry size at least */
1732         shift = sizeof(*dom_ent);
1733         for_each_comp_entry_v1(comp_v1, ent) {
1734                 off = le32_to_cpu(ent->lcme_offset);
1735                 if (off == dom_off) {
1736                         /* Entry deletion creates two holes in layout data:
1737                          * - hole in entries array
1738                          * - hole in layout data at dom_off with dom_size
1739                          *
1740                          * First memmove is one entry shift from next entry
1741                          * start with size up to dom_off in blob
1742                          */
1743                         dst = (void *)ent;
1744                         src = (void *)(ent + 1);
1745                         size = (unsigned long)((void *)comp_v1 + dom_off - src);
1746                         memmove(dst, src, size);
1747                         /* take 'off' from just moved entry */
1748                         off = le32_to_cpu(ent->lcme_offset);
1749                         /* second memmove is blob tail after 'off' up to
1750                          * component end
1751                          */
1752                         dst = (void *)comp_v1 + dom_off - sizeof(*ent);
1753                         src = (void *)comp_v1 + off;
1754                         size = (unsigned long)(comp_size - off);
1755                         memmove(dst, src, size);
1756                         /* all entries offsets after DoM entry are shifted by
1757                          * dom_size additionally
1758                          */
1759                         shift += dom_size;
1760                 }
1761                 ent->lcme_offset = cpu_to_le32(off - shift);
1762         }
1763         comp_v1->lcm_size = cpu_to_le32(comp_size - shift);
1764
1765         /* notify a caller to re-check entry */
1766         return -ERESTART;
1767 }
1768
1769 void lod_dom_stripesize_recalc(struct lod_device *d)
1770 {
1771         __u64 threshold_mb = d->lod_dom_threshold_free_mb;
1772         __u32 max_size = d->lod_dom_stripesize_max_kb;
1773         __u32 def_size = d->lod_dom_stripesize_cur_kb;
1774
1775         /* use maximum allowed value if free space is above threshold */
1776         if (d->lod_lsfs_free_mb >= threshold_mb) {
1777                 def_size = max_size;
1778         } else if (!d->lod_lsfs_free_mb || max_size <= LOD_DOM_MIN_SIZE_KB) {
1779                 def_size = 0;
1780         } else {
1781                 /* recalc threshold like it would be with def_size as max */
1782                 threshold_mb = mult_frac(threshold_mb, def_size, max_size);
1783                 if (d->lod_lsfs_free_mb < threshold_mb)
1784                         def_size = rounddown(def_size / 2, LOD_DOM_MIN_SIZE_KB);
1785                 else if (d->lod_lsfs_free_mb > threshold_mb * 2)
1786                         def_size = max_t(unsigned int, def_size * 2,
1787                                          LOD_DOM_MIN_SIZE_KB);
1788         }
1789
1790         if (d->lod_dom_stripesize_cur_kb != def_size) {
1791                 CDEBUG(D_LAYOUT, "Change default DOM stripe size %d->%d\n",
1792                        d->lod_dom_stripesize_cur_kb, def_size);
1793                 d->lod_dom_stripesize_cur_kb = def_size;
1794         }
1795 }
1796
1797 static __u32 lod_dom_stripesize_limit(const struct lu_env *env,
1798                                       struct lod_device *d)
1799 {
1800         int rc;
1801
1802         /* set bfree as fraction of total space */
1803         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_SPOOF)) {
1804                 spin_lock(&d->lod_lsfs_lock);
1805                 d->lod_lsfs_free_mb = mult_frac(d->lod_lsfs_total_mb,
1806                                         min_t(int, cfs_fail_val, 100), 100);
1807                 GOTO(recalc, rc = 0);
1808         }
1809
1810         if (d->lod_lsfs_age < ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE) {
1811                 struct obd_statfs sfs;
1812
1813                 spin_lock(&d->lod_lsfs_lock);
1814                 if (d->lod_lsfs_age > ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE)
1815                         GOTO(unlock, rc = 0);
1816
1817                 d->lod_lsfs_age = ktime_get_seconds();
1818                 spin_unlock(&d->lod_lsfs_lock);
1819                 rc = dt_statfs(env, d->lod_child, &sfs);
1820                 if (rc) {
1821                         CDEBUG(D_LAYOUT,
1822                                "%s: failed to get OSD statfs: rc = %d\n",
1823                                lod2obd(d)->obd_name, rc);
1824                         GOTO(out, rc);
1825                 }
1826                 /* udpate local OSD cached statfs data */
1827                 spin_lock(&d->lod_lsfs_lock);
1828                 d->lod_lsfs_total_mb = (sfs.os_blocks * sfs.os_bsize) >> 20;
1829                 d->lod_lsfs_free_mb = (sfs.os_bfree * sfs.os_bsize) >> 20;
1830 recalc:
1831                 lod_dom_stripesize_recalc(d);
1832 unlock:
1833                 spin_unlock(&d->lod_lsfs_lock);
1834         }
1835 out:
1836         return d->lod_dom_stripesize_cur_kb << 10;
1837 }
1838
1839 int lod_dom_stripesize_choose(const struct lu_env *env, struct lod_device *d,
1840                               struct lov_comp_md_v1 *comp_v1,
1841                               struct lov_comp_md_entry_v1 *dom_ent,
1842                               __u32 stripe_size)
1843 {
1844         struct lov_comp_md_entry_v1 *ent;
1845         struct lu_extent *dom_ext, *ext;
1846         struct lov_user_md_v1 *lum;
1847         __u32 max_stripe_size;
1848         __u16 mid, dom_mid;
1849         int rc = 0;
1850         bool dom_next_entry = false;
1851
1852         dom_ext = &dom_ent->lcme_extent;
1853         dom_mid = mirror_id_of(le32_to_cpu(dom_ent->lcme_id));
1854         max_stripe_size = lod_dom_stripesize_limit(env, d);
1855
1856         /* Check stripe size againts current per-MDT limit */
1857         if (stripe_size <= max_stripe_size)
1858                 return 0;
1859
1860         lum = (void *)comp_v1 + le32_to_cpu(dom_ent->lcme_offset);
1861         CDEBUG(D_LAYOUT, "overwrite DoM component size %u with MDT limit %u\n",
1862                stripe_size, max_stripe_size);
1863         lum->lmm_stripe_size = cpu_to_le32(max_stripe_size);
1864
1865         /* In common case the DoM stripe is first entry in a mirror and
1866          * can be deleted only if it is not single entry in layout or
1867          * mirror, otherwise error should be returned.
1868          */
1869         for_each_comp_entry_v1(comp_v1, ent) {
1870                 if (ent == dom_ent)
1871                         continue;
1872
1873                 mid = mirror_id_of(le32_to_cpu(ent->lcme_id));
1874                 if (mid != dom_mid)
1875                         continue;
1876
1877                 ext = &ent->lcme_extent;
1878                 if (ext->e_start != dom_ext->e_end)
1879                         continue;
1880
1881                 /* Found next component after the DoM one with the same
1882                  * mirror_id and adjust its start with DoM component end.
1883                  *
1884                  * NOTE: we are considering here that there can be only one
1885                  * DoM component in a file, all replicas are located on OSTs
1886                  * always and don't need adjustment since use own layouts.
1887                  */
1888                 ext->e_start = cpu_to_le64(max_stripe_size);
1889                 dom_next_entry = true;
1890                 break;
1891         }
1892
1893         if (max_stripe_size == 0) {
1894                 /* DoM component size is zero due to server setting, remove
1895                  * it from the layout but only if next component exists in
1896                  * the same mirror. That must be checked prior calling the
1897                  * lod_erase_dom_stripe().
1898                  */
1899                 if (!dom_next_entry)
1900                         return -EFBIG;
1901
1902                 rc = lod_erase_dom_stripe(comp_v1, dom_ent);
1903         } else {
1904                 /* Update DoM extent end finally */
1905                 dom_ext->e_end = cpu_to_le64(max_stripe_size);
1906         }
1907
1908         return rc;
1909 }
1910
1911 /**
1912  * Verify LOV striping.
1913  *
1914  * \param[in] d                 LOD device
1915  * \param[in] buf               buffer with LOV EA to verify
1916  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1917  *                              1 - from disk, do not allow
1918  * \param[in] start             extent start for composite layout
1919  *
1920  * \retval                      0 if the striping is valid
1921  * \retval                      -EINVAL if striping is invalid
1922  */
1923 int lod_verify_striping(const struct lu_env *env, struct lod_device *d,
1924                         struct lod_object *lo, const struct lu_buf *buf,
1925                         bool is_from_disk)
1926 {
1927         struct lov_user_md_v1   *lum;
1928         struct lov_comp_md_v1   *comp_v1;
1929         struct lov_comp_md_entry_v1     *ent;
1930         struct lu_extent        *ext;
1931         struct lu_buf   tmp;
1932         __u64   prev_end = 0;
1933         __u32   stripe_size = 0;
1934         __u16   prev_mid = -1, mirror_id = -1;
1935         __u32   mirror_count;
1936         __u32   magic;
1937         int     rc = 0;
1938         ENTRY;
1939
1940         if (buf->lb_len < sizeof(lum->lmm_magic)) {
1941                 CDEBUG(D_LAYOUT, "invalid buf len %zu\n", buf->lb_len);
1942                 RETURN(-EINVAL);
1943         }
1944
1945         lum = buf->lb_buf;
1946
1947         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1948         /* treat foreign LOV EA/object case first
1949          * XXX is it expected to try setting again a foreign?
1950          * XXX should we care about different current vs new layouts ?
1951          */
1952         if (unlikely(magic == LOV_USER_MAGIC_FOREIGN)) {
1953                 struct lov_foreign_md *lfm = buf->lb_buf;
1954
1955                 if (buf->lb_len < offsetof(typeof(*lfm), lfm_value)) {
1956                         CDEBUG(D_LAYOUT,
1957                                "buf len %zu < min lov_foreign_md size (%zu)\n",
1958                                buf->lb_len, offsetof(typeof(*lfm),
1959                                lfm_value));
1960                         RETURN(-EINVAL);
1961                 }
1962
1963                 if (foreign_size_le(lfm) > buf->lb_len) {
1964                         CDEBUG(D_LAYOUT,
1965                                "buf len %zu < this lov_foreign_md size (%zu)\n",
1966                                buf->lb_len, foreign_size_le(lfm));
1967                         RETURN(-EINVAL);
1968                 }
1969                 /* Don't do anything with foreign layouts */
1970                 RETURN(0);
1971         }
1972
1973         /* normal LOV/layout cases */
1974
1975         if (buf->lb_len < sizeof(*lum)) {
1976                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1977                        buf->lb_len);
1978                 RETURN(-EINVAL);
1979         }
1980
1981         switch (magic) {
1982         case LOV_USER_MAGIC_FOREIGN:
1983                 RETURN(0);
1984         case LOV_USER_MAGIC_V1:
1985         case LOV_USER_MAGIC_V3:
1986         case LOV_USER_MAGIC_SPECIFIC:
1987                 RETURN(lod_verify_v1v3(d, buf, is_from_disk));
1988         case LOV_USER_MAGIC_COMP_V1:
1989         case LOV_USER_MAGIC_SEL:
1990                 break;
1991         default:
1992                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1993                        le32_to_cpu(lum->lmm_magic));
1994                 RETURN(-EINVAL);
1995         }
1996
1997         /* magic == LOV_USER_MAGIC_COMP_V1 */
1998         comp_v1 = buf->lb_buf;
1999         if (buf->lb_len < le32_to_cpu(comp_v1->lcm_size)) {
2000                 CDEBUG(D_LAYOUT, "buf len %zu is less than %u\n",
2001                        buf->lb_len, le32_to_cpu(comp_v1->lcm_size));
2002                 RETURN(-EINVAL);
2003         }
2004
2005 recheck:
2006         mirror_count = 0;
2007         if (le16_to_cpu(comp_v1->lcm_entry_count) == 0) {
2008                 CDEBUG(D_LAYOUT, "entry count is zero\n");
2009                 RETURN(-EINVAL);
2010         }
2011
2012         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
2013             lo->ldo_comp_cnt > 0) {
2014                 /* could be called from lustre.lov.add */
2015                 __u32 cnt = lo->ldo_comp_cnt;
2016
2017                 ext = &lo->ldo_comp_entries[cnt - 1].llc_extent;
2018                 prev_end = ext->e_end;
2019
2020                 ++mirror_count;
2021         }
2022
2023         for_each_comp_entry_v1(comp_v1, ent) {
2024                 ext = &ent->lcme_extent;
2025
2026                 if (le64_to_cpu(ext->e_start) > le64_to_cpu(ext->e_end) ||
2027                     le64_to_cpu(ext->e_start) & (LOV_MIN_STRIPE_SIZE - 1) ||
2028                     (le64_to_cpu(ext->e_end) != LUSTRE_EOF &&
2029                     le64_to_cpu(ext->e_end) & (LOV_MIN_STRIPE_SIZE - 1))) {
2030                         CDEBUG(D_LAYOUT, "invalid extent "DEXT"\n",
2031                                le64_to_cpu(ext->e_start),
2032                                le64_to_cpu(ext->e_end));
2033                         RETURN(-EINVAL);
2034                 }
2035
2036                 if (is_from_disk) {
2037                         /* lcme_id contains valid value */
2038                         if (le32_to_cpu(ent->lcme_id) == 0 ||
2039                             le32_to_cpu(ent->lcme_id) > LCME_ID_MAX) {
2040                                 CDEBUG(D_LAYOUT, "invalid id %u\n",
2041                                        le32_to_cpu(ent->lcme_id));
2042                                 RETURN(-EINVAL);
2043                         }
2044
2045                         if (le16_to_cpu(comp_v1->lcm_mirror_count) > 0) {
2046                                 mirror_id = mirror_id_of(
2047                                                 le32_to_cpu(ent->lcme_id));
2048
2049                                 /* first component must start with 0 */
2050                                 if (mirror_id != prev_mid &&
2051                                     le64_to_cpu(ext->e_start) != 0) {
2052                                         CDEBUG(D_LAYOUT,
2053                                                "invalid start:%llu, expect:0\n",
2054                                                le64_to_cpu(ext->e_start));
2055                                         RETURN(-EINVAL);
2056                                 }
2057
2058                                 prev_mid = mirror_id;
2059                         }
2060                 }
2061
2062                 if (le64_to_cpu(ext->e_start) == 0) {
2063                         ++mirror_count;
2064                         prev_end = 0;
2065                 }
2066
2067                 /* the next must be adjacent with the previous one */
2068                 if (le64_to_cpu(ext->e_start) != prev_end) {
2069                         CDEBUG(D_LAYOUT,
2070                                "invalid start actual:%llu, expect:%llu\n",
2071                                le64_to_cpu(ext->e_start), prev_end);
2072                         RETURN(-EINVAL);
2073                 }
2074
2075                 tmp.lb_buf = (char *)comp_v1 + le32_to_cpu(ent->lcme_offset);
2076                 tmp.lb_len = le32_to_cpu(ent->lcme_size);
2077
2078                 /* Check DoM entry is always the first one */
2079                 lum = tmp.lb_buf;
2080                 if (lov_pattern(le32_to_cpu(lum->lmm_pattern)) ==
2081                     LOV_PATTERN_MDT) {
2082                         /* DoM component must be the first in a mirror */
2083                         if (le64_to_cpu(ext->e_start) > 0) {
2084                                 CDEBUG(D_LAYOUT, "invalid DoM component "
2085                                        "with %llu extent start\n",
2086                                        le64_to_cpu(ext->e_start));
2087                                 RETURN(-EINVAL);
2088                         }
2089                         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2090                         /* There is just one stripe on MDT and it must
2091                          * cover whole component size. */
2092                         if (stripe_size != le64_to_cpu(ext->e_end)) {
2093                                 CDEBUG(D_LAYOUT, "invalid DoM layout "
2094                                        "stripe size %u != %llu "
2095                                        "(component size)\n",
2096                                        stripe_size, prev_end);
2097                                 RETURN(-EINVAL);
2098                         }
2099                         /* Check and adjust stripe size by per-MDT limit */
2100                         rc = lod_dom_stripesize_choose(env, d, comp_v1, ent,
2101                                                        stripe_size);
2102                         /* DoM entry was removed, re-check layout from start */
2103                         if (rc == -ERESTART)
2104                                 goto recheck;
2105                         else if (rc)
2106                                 RETURN(rc);
2107
2108                         if (le16_to_cpu(lum->lmm_stripe_count) == 1)
2109                                 lum->lmm_stripe_count = 0;
2110                         /* Any stripe count is forbidden on DoM component */
2111                         if (lum->lmm_stripe_count > 0) {
2112                                 CDEBUG(D_LAYOUT,
2113                                        "invalid DoM layout stripe count %u, must be 0\n",
2114                                        le16_to_cpu(lum->lmm_stripe_count));
2115                                 RETURN(-EINVAL);
2116                         }
2117
2118                         /* Any pool is forbidden on DoM component */
2119                         if (lum->lmm_magic == LOV_USER_MAGIC_V3) {
2120                                 struct lov_user_md_v3 *v3 = (void *)lum;
2121
2122                                 if (v3->lmm_pool_name[0] != '\0') {
2123                                         CDEBUG(D_LAYOUT,
2124                                                "DoM component cannot have pool assigned\n");
2125                                         RETURN(-EINVAL);
2126                                 }
2127                         }
2128                 }
2129
2130                 prev_end = le64_to_cpu(ext->e_end);
2131
2132                 rc = lod_verify_v1v3(d, &tmp, is_from_disk);
2133                 if (rc)
2134                         RETURN(rc);
2135
2136                 if (prev_end == LUSTRE_EOF || ext->e_start == prev_end)
2137                         continue;
2138
2139                 /* extent end must be aligned with the stripe_size */
2140                 stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2141                 if (stripe_size && prev_end % stripe_size) {
2142                         CDEBUG(D_LAYOUT, "stripe size isn't aligned, "
2143                                "stripe_sz: %u, [%llu, %llu)\n",
2144                                stripe_size, ext->e_start, prev_end);
2145                         RETURN(-EINVAL);
2146                 }
2147         }
2148
2149         /* make sure that the mirror_count is telling the truth */
2150         if (mirror_count != le16_to_cpu(comp_v1->lcm_mirror_count) + 1)
2151                 RETURN(-EINVAL);
2152
2153         RETURN(0);
2154 }
2155
2156 /**
2157  * set the default stripe size, if unset.
2158  *
2159  * \param[in,out] val   number of bytes per OST stripe
2160  *
2161  * The minimum stripe size is 64KB to ensure that a single stripe is an
2162  * even multiple of a client PAGE_SIZE (IA64, PPC, etc).  Otherwise, it
2163  * is difficult to split dirty pages across OSCs during writes.
2164  */
2165 void lod_fix_desc_stripe_size(__u64 *val)
2166 {
2167         if (*val < LOV_MIN_STRIPE_SIZE) {
2168                 if (*val != 0)
2169                         LCONSOLE_INFO("Increasing default stripe size to "
2170                                       "minimum value %u\n",
2171                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
2172                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
2173         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
2174                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
2175                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
2176                               "multiple of %u)\n",
2177                               *val, LOV_MIN_STRIPE_SIZE);
2178         }
2179 }
2180
2181 /**
2182  * set the filesystem default number of stripes, if unset.
2183  *
2184  * \param[in,out] val   number of stripes
2185  *
2186  * A value of "0" means "use the system-wide default stripe count", which
2187  * has either been inherited by now, or falls back to 1 stripe per file.
2188  * A value of "-1" (0xffffffff) means "stripe over all available OSTs",
2189  * and is a valid value, so is left unchanged here.
2190  */
2191 void lod_fix_desc_stripe_count(__u32 *val)
2192 {
2193         if (*val == 0)
2194                 *val = 1;
2195 }
2196
2197 /**
2198  * set the filesystem default layout pattern
2199  *
2200  * \param[in,out] val   LOV_PATTERN_* layout
2201  *
2202  * A value of "0" means "use the system-wide default layout type", which
2203  * has either been inherited by now, or falls back to plain RAID0 striping.
2204  */
2205 void lod_fix_desc_pattern(__u32 *val)
2206 {
2207         /* from lov_setstripe */
2208         if ((*val != 0) && !lov_pattern_supported_normal_comp(*val)) {
2209                 LCONSOLE_WARN("lod: Unknown stripe pattern: %#x\n", *val);
2210                 *val = 0;
2211         }
2212 }
2213
2214 void lod_fix_lmv_desc_pattern(__u32 *val)
2215 {
2216         if ((*val) && !lmv_is_known_hash_type(*val)) {
2217                 LCONSOLE_WARN("lod: Unknown md stripe pattern: %#x\n", *val);
2218                 *val = 0;
2219         }
2220 }
2221
2222 void lod_fix_desc_qos_maxage(__u32 *val)
2223 {
2224         /* fix qos_maxage */
2225         if (*val == 0)
2226                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
2227 }
2228
2229 /**
2230  * Used to fix insane default striping.
2231  *
2232  * \param[in] desc      striping description
2233  */
2234 void lod_fix_desc(struct lov_desc *desc)
2235 {
2236         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
2237         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2238         lod_fix_desc_pattern(&desc->ld_pattern);
2239         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2240 }
2241
2242 static void lod_fix_lmv_desc(struct lmv_desc *desc)
2243 {
2244         desc->ld_active_tgt_count = 0;
2245         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2246         lod_fix_lmv_desc_pattern(&desc->ld_pattern);
2247         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2248 }
2249
2250 /**
2251  * Initialize the structures used to store pools and default striping.
2252  *
2253  * \param[in] lod       LOD device
2254  * \param[in] lcfg      configuration structure storing default striping.
2255  *
2256  * \retval              0 if initialization succeeds
2257  * \retval              negative error number on failure
2258  */
2259 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
2260 {
2261         struct obd_device          *obd;
2262         struct lov_desc            *desc;
2263         int                         rc;
2264         ENTRY;
2265
2266         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
2267         LASSERT(obd != NULL);
2268         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
2269
2270         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
2271                 CERROR("LOD setup requires a descriptor\n");
2272                 RETURN(-EINVAL);
2273         }
2274
2275         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
2276
2277         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
2278                 CERROR("descriptor size wrong: %d > %d\n",
2279                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
2280                 RETURN(-EINVAL);
2281         }
2282
2283         if (desc->ld_magic != LOV_DESC_MAGIC) {
2284                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
2285                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
2286                                obd->obd_name, desc);
2287                         lustre_swab_lov_desc(desc);
2288                 } else {
2289                         CERROR("%s: Bad lov desc magic: %#x\n",
2290                                obd->obd_name, desc->ld_magic);
2291                         RETURN(-EINVAL);
2292                 }
2293         }
2294
2295         lod_fix_desc(desc);
2296
2297         desc->ld_active_tgt_count = 0;
2298         lod->lod_ost_descs.ltd_lov_desc = *desc;
2299
2300         /* NB: config doesn't contain lmv_desc, alter it via sysfs. */
2301         lod_fix_lmv_desc(&lod->lod_mdt_descs.ltd_lmv_desc);
2302
2303         lod->lod_sp_me = LUSTRE_SP_CLI;
2304
2305         /* Set up OST pool environment */
2306         lod->lod_pool_count = 0;
2307         rc = lod_pool_hash_init(&lod->lod_pools_hash_body);
2308         if (rc)
2309                 RETURN(-ENOMEM);
2310
2311         INIT_LIST_HEAD(&lod->lod_pool_list);
2312         lod->lod_pool_count = 0;
2313         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_tgt_pool, 0);
2314         if (rc)
2315                 GOTO(out_hash, rc);
2316
2317         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool, 0);
2318         if (rc)
2319                 GOTO(out_mdt_pool, rc);
2320
2321         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_tgt_pool, 0);
2322         if (rc)
2323                 GOTO(out_mdt_rr_pool, rc);
2324
2325         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool, 0);
2326         if (rc)
2327                 GOTO(out_ost_pool, rc);
2328
2329         RETURN(0);
2330
2331 out_ost_pool:
2332         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2333 out_mdt_rr_pool:
2334         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2335 out_mdt_pool:
2336         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2337 out_hash:
2338         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2339
2340         return rc;
2341 }
2342
2343 /**
2344  * Release the structures describing the pools.
2345  *
2346  * \param[in] lod       LOD device from which we release the structures
2347  *
2348  * \retval              0 always
2349  */
2350 int lod_pools_fini(struct lod_device *lod)
2351 {
2352         struct obd_device   *obd = lod2obd(lod);
2353         struct pool_desc    *pool, *tmp;
2354         ENTRY;
2355
2356         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
2357                 /* free pool structs */
2358                 CDEBUG(D_INFO, "delete pool %p\n", pool);
2359                 /* In the function below, .hs_keycmp resolves to
2360                  * pool_hashkey_keycmp() */
2361                 /* coverity[overrun-buffer-val] */
2362                 lod_pool_del(obd, pool->pool_name);
2363         }
2364
2365         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2366         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool);
2367         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2368         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2369         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2370
2371         RETURN(0);
2372 }