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_MULTIMODRPCS |
 211                                            OBD_CONNECT_FID |
 212                                            OBD_CONNECT_AT |
 213                                            OBD_CONNECT_FULL20 |
 214                                            OBD_CONNECT_LFSCK |
 215                                            OBD_CONNECT_BULK_MBITS;
 216                 spin_lock(&imp->imp_lock);
 217                 imp->imp_server_timeout = 1;
 218                 spin_unlock(&imp->imp_lock);
 219                 imp->imp_client->cli_request_portal = OUT_PORTAL;
 220                 CDEBUG(D_OTHER, "%s: Set 'mds' portal and timeout\n",
 221                       obd->obd_name);
 222                 ltd = &lod->lod_mdt_descs;
 223         }
 224
 225         rc = obd_connect(env, &exp, obd, &obd->obd_uuid, data, NULL);
 226         OBD_FREE_PTR(data);
 227         if (rc) {
 228                 CERROR("%s: cannot connect to next dev %s (%d)\n",
 229                        obd->obd_name, osp, rc);
 230                 GOTO(out_cleanup, rc);
 231         }
 232         connected = true;
 233
 234         /* Allocate ost descriptor and fill it */
 235         OBD_ALLOC_PTR(tgt_desc);
 236         if (!tgt_desc)
 237                 GOTO(out_cleanup, rc = -ENOMEM);
 238
 239         tgt_desc->ltd_tgt    = dt_dev;
 240         tgt_desc->ltd_exp    = exp;
 241         tgt_desc->ltd_uuid   = obd->u.cli.cl_target_uuid;
 242         tgt_desc->ltd_gen    = gen;
 243         tgt_desc->ltd_index  = index;
 244         tgt_desc->ltd_active = active;
 245
 246         down_write(&ltd->ltd_rw_sem);
 247         mutex_lock(&ltd->ltd_mutex);
 248         rc = ltd_add_tgt(ltd, tgt_desc);
 249         if (rc)
 250                 GOTO(out_mutex, rc);
 251
 252         rc = lu_qos_add_tgt(&ltd->ltd_qos, tgt_desc);
 253         if (rc)
 254                 GOTO(out_del_tgt, rc);
 255
 256         rc = lu_tgt_pool_add(&ltd->ltd_tgt_pool, index,
 257                           ltd->ltd_lov_desc.ld_tgt_count);
 258         if (rc) {
 259                 CERROR("%s: can't set up pool, failed with %d\n",
 260                        obd->obd_name, rc);
 261                 GOTO(out_del_tgt, rc);
 262         }
 263
 264         mutex_unlock(&ltd->ltd_mutex);
 265         up_write(&ltd->ltd_rw_sem);
 266
 267         if (lod->lod_recovery_completed)
 268                 lu_dev->ld_ops->ldo_recovery_complete(env, lu_dev);
 269
 270         if (!for_ost && lod->lod_initialized) {
 271                 rc = lod_sub_init_llog(env, lod, tgt_desc->ltd_tgt);
 272                 if (rc != 0) {
 273                         CERROR("%s: cannot start llog on %s:rc = %d\n",
 274                                lod2obd(lod)->obd_name, osp, rc);
 275                         GOTO(out_ltd, rc);
 276                 }
 277         }
 278
 279         rc = lfsck_add_target(env, lod->lod_child, dt_dev, exp, index, for_ost);
 280         if (rc != 0) {
 281                 CERROR("Fail to add LFSCK target: name = %s, type = %s, "
 282                        "index = %u, rc = %d\n", osp, type, index, rc);
 283                 GOTO(out_fini_llog, rc);
 284         }
 285         RETURN(rc);
 286 out_fini_llog:
 287         lod_sub_fini_llog(env, tgt_desc->ltd_tgt,
 288                           &tgt_desc->ltd_recovery_task);
 289 out_ltd:
 290         down_write(&ltd->ltd_rw_sem);
 291         mutex_lock(&ltd->ltd_mutex);
 292         lu_tgt_pool_remove(&ltd->ltd_tgt_pool, index);
 293 out_del_tgt:
 294         ltd_del_tgt(ltd, tgt_desc);
 295 out_mutex:
 296         mutex_unlock(&ltd->ltd_mutex);
 297         up_write(&ltd->ltd_rw_sem);
 298         OBD_FREE_PTR(tgt_desc);
 299 out_cleanup:
 300         /* XXX OSP needs us to send down LCFG_CLEANUP because it uses
 301          * objects from the MDT stack. See LU-7184. */
 302         lcfg = &lod_env_info(env)->lti_lustre_cfg;
 303         memset(lcfg, 0, sizeof(*lcfg));
 304         lcfg->lcfg_version = LUSTRE_CFG_VERSION;
 305         lcfg->lcfg_command = LCFG_CLEANUP;
 306         lu_dev->ld_ops->ldo_process_config(env, lu_dev, lcfg);
 307
 308         if (connected)
 309                 obd_disconnect(exp);
 310
 311         return rc;
 312 }
 313
 314 /**
 315  * Schedule target removal from the target table.
 316  *
 317  * Mark the device as dead. The device is not removed here because it may
 318  * still be in use. The device will be removed in lod_putref() when the
 319  * last reference is released.
 320  *
 321  * \param[in] env               execution environment for this thread
 322  * \param[in] lod               LOD device the target table belongs to
 323  * \param[in] ltd               target table
 324  * \param[in] tgt               target
 325  */
 326 static void __lod_del_device(const struct lu_env *env, struct lod_device *lod,
 327                              struct lod_tgt_descs *ltd, struct lu_tgt_desc *tgt)
 328 {
 329         lfsck_del_target(env, lod->lod_child, tgt->ltd_tgt, tgt->ltd_index,
 330                          !ltd->ltd_is_mdt);
 331
 332         if (!tgt->ltd_reap) {
 333                 tgt->ltd_reap = 1;
 334                 ltd->ltd_death_row++;
 335         }
 336 }
 337
 338 /**
 339  * Schedule removal of all the targets from the given target table.
 340  *
 341  * See more details in the description for __lod_del_device()
 342  *
 343  * \param[in] env               execution environment for this thread
 344  * \param[in] lod               LOD device the target table belongs to
 345  * \param[in] ltd               target table
 346  *
 347  * \retval                      0 always
 348  */
 349 int lod_fini_tgt(const struct lu_env *env, struct lod_device *lod,
 350                  struct lod_tgt_descs *ltd)
 351 {
 352         struct lu_tgt_desc *tgt;
 353
 354         if (ltd->ltd_tgts_size <= 0)
 355                 return 0;
 356
 357         lod_getref(ltd);
 358         mutex_lock(&ltd->ltd_mutex);
 359         ltd_foreach_tgt(ltd, tgt)
 360                 __lod_del_device(env, lod, ltd, tgt);
 361         mutex_unlock(&ltd->ltd_mutex);
 362         lod_putref(lod, ltd);
 363
 364         lu_tgt_descs_fini(ltd);
 365
 366         return 0;
 367 }
 368
 369 /**
 370  * Remove device by name.
 371  *
 372  * Remove a device identified by \a osp from the target table. Given
 373  * the device can be in use, the real deletion happens in lod_putref().
 374  *
 375  * \param[in] env               execution environment for this thread
 376  * \param[in] lod               LOD device to be connected to the new OSP
 377  * \param[in] ltd               target table
 378  * \param[in] osp               name of OSP device to be removed
 379  * \param[in] idx               index of the target
 380  * \param[in] gen               generation number, not used currently
 381  *
 382  * \retval                      0 if the device was scheduled for removal
 383  * \retval                      -EINVAL if no device was found
 384  */
 385 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
 386                    struct lod_tgt_descs *ltd, char *osp, unsigned int idx,
 387                    unsigned int gen)
 388 {
 389         struct obd_device *obd;
 390         struct lu_tgt_desc *tgt;
 391         struct obd_uuid uuid;
 392         int rc = 0;
 393
 394         ENTRY;
 395
 396         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
 397
 398         obd_str2uuid(&uuid, osp);
 399
 400         obd = class_find_client_obd(&uuid, LUSTRE_OSP_NAME,
 401                                    &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 402         if (obd == NULL) {
 403                 CERROR("can't find %s device\n", osp);
 404                 RETURN(-EINVAL);
 405         }
 406
 407         if (gen <= 0) {
 408                 CERROR("%s: request to remove OBD %s with invalid generation %d"
 409                        "\n", obd->obd_name, osp, gen);
 410                 RETURN(-EINVAL);
 411         }
 412
 413         obd_str2uuid(&uuid,  osp);
 414
 415         lod_getref(ltd);
 416         mutex_lock(&ltd->ltd_mutex);
 417         tgt = LTD_TGT(ltd, idx);
 418         /* check that the index is allocated in the bitmap */
 419         if (!test_bit(idx, ltd->ltd_tgt_bitmap) || !tgt) {
 420                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
 421                 GOTO(out, rc = -EINVAL);
 422         }
 423
 424         /* check that the UUID matches */
 425         if (!obd_uuid_equals(&uuid, &tgt->ltd_uuid)) {
 426                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
 427                        obd->obd_name, obd_uuid2str(&tgt->ltd_uuid), idx, osp);
 428                 GOTO(out, rc = -EINVAL);
 429         }
 430
 431         __lod_del_device(env, lod, ltd, tgt);
 432         EXIT;
 433 out:
 434         mutex_unlock(&ltd->ltd_mutex);
 435         lod_putref(lod, ltd);
 436         return(rc);
 437 }
 438
 439 /**
 440  * Resize per-thread storage to hold specified size.
 441  *
 442  * A helper function to resize per-thread temporary storage. This storage
 443  * is used to process LOV/LVM EAs and may be quite large. We do not want to
 444  * allocate/release it every time, so instead we put it into the env and
 445  * reallocate on demand. The memory is released when the correspondent thread
 446  * is finished.
 447  *
 448  * \param[in] info              LOD-specific storage in the environment
 449  * \param[in] size              new size to grow the buffer to
 450
 451  * \retval                      0 on success, -ENOMEM if reallocation failed
 452  */
 453 int lod_ea_store_resize(struct lod_thread_info *info, size_t size)
 454 {
 455         __u32 round = size_roundup_power2(size);
 456
 457         if (info->lti_ea_store) {
 458                 LASSERT(info->lti_ea_store_size);
 459                 LASSERT(info->lti_ea_store_size < round);
 460                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
 461                        info->lti_ea_store_size, round);
 462                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
 463                 info->lti_ea_store = NULL;
 464                 info->lti_ea_store_size = 0;
 465         }
 466
 467         OBD_ALLOC_LARGE(info->lti_ea_store, round);
 468         if (info->lti_ea_store == NULL)
 469                 RETURN(-ENOMEM);
 470         info->lti_ea_store_size = round;
 471
 472         RETURN(0);
 473 }
 474
 475 static void lod_free_comp_buffer(struct lod_layout_component *entries,
 476                                  __u16 count, __u32 bufsize)
 477 {
 478         struct lod_layout_component *entry;
 479         int i;
 480
 481         for (i = 0; i < count; i++) {
 482                 entry = &entries[i];
 483                 if (entry->llc_pool != NULL)
 484                         lod_set_pool(&entry->llc_pool, NULL);
 485                 if (entry->llc_ostlist.op_array)
 486                         OBD_FREE(entry->llc_ostlist.op_array,
 487                                  entry->llc_ostlist.op_size);
 488                 LASSERT(entry->llc_stripe == NULL);
 489                 LASSERT(entry->llc_stripes_allocated == 0);
 490         }
 491
 492         if (bufsize != 0)
 493                 OBD_FREE_LARGE(entries, bufsize);
 494 }
 495
 496 void lod_free_def_comp_entries(struct lod_default_striping *lds)
 497 {
 498         lod_free_comp_buffer(lds->lds_def_comp_entries,
 499                              lds->lds_def_comp_size_cnt,
 500                              size_roundup_power2(
 501                                      sizeof(*lds->lds_def_comp_entries) *
 502                                      lds->lds_def_comp_size_cnt));
 503         lds->lds_def_comp_entries = NULL;
 504         lds->lds_def_comp_cnt = 0;
 505         lds->lds_def_striping_is_composite = 0;
 506         lds->lds_def_comp_size_cnt = 0;
 507 }
 508
 509 /**
 510  * Resize per-thread storage to hold default striping component entries
 511  *
 512  * A helper function to resize per-thread temporary storage. This storage
 513  * is used to hold default LOV/LVM EAs and may be quite large. We do not want
 514  * to allocate/release it every time, so instead we put it into the env and
 515  * reallocate it on demand. The memory is released when the correspondent
 516  * thread is finished.
 517  *
 518  * \param[in,out] lds           default striping
 519  * \param[in] count             new component count to grow the buffer to
 520
 521  * \retval                      0 on success, -ENOMEM if reallocation failed
 522  */
 523 int lod_def_striping_comp_resize(struct lod_default_striping *lds, __u16 count)
 524 {
 525         struct lod_layout_component *entries;
 526         __u32 new = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
 527                                         count);
 528         __u32 old = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
 529                                         lds->lds_def_comp_size_cnt);
 530
 531         if (new <= old)
 532                 return 0;
 533
 534         OBD_ALLOC_LARGE(entries, new);
 535         if (entries == NULL)
 536                 return -ENOMEM;
 537
 538         if (lds->lds_def_comp_entries != NULL) {
 539                 CDEBUG(D_INFO, "default striping component size %d is not "
 540                        "enough, need %d\n", old, new);
 541                 lod_free_def_comp_entries(lds);
 542         }
 543
 544         lds->lds_def_comp_entries = entries;
 545         lds->lds_def_comp_size_cnt = count;
 546
 547         RETURN(0);
 548 }
 549
 550 void lod_free_comp_entries(struct lod_object *lo)
 551 {
 552         if (lo->ldo_mirrors) {
 553                 OBD_FREE_PTR_ARRAY(lo->ldo_mirrors, lo->ldo_mirror_count);
 554                 lo->ldo_mirrors = NULL;
 555                 lo->ldo_mirror_count = 0;
 556         }
 557         lod_free_comp_buffer(lo->ldo_comp_entries,
 558                              lo->ldo_comp_cnt,
 559                              sizeof(*lo->ldo_comp_entries) * lo->ldo_comp_cnt);
 560         lo->ldo_comp_entries = NULL;
 561         lo->ldo_comp_cnt = 0;
 562         lo->ldo_is_composite = 0;
 563 }
 564
 565 int lod_alloc_comp_entries(struct lod_object *lo,
 566                            int mirror_count, int comp_count)
 567 {
 568         LASSERT(comp_count != 0);
 569         LASSERT(lo->ldo_comp_cnt == 0 && lo->ldo_comp_entries == NULL);
 570
 571         if (mirror_count > 0) {
 572                 OBD_ALLOC_PTR_ARRAY(lo->ldo_mirrors, mirror_count);
 573                 if (!lo->ldo_mirrors)
 574                         return -ENOMEM;
 575
 576                 lo->ldo_mirror_count = mirror_count;
 577         }
 578
 579         OBD_ALLOC_LARGE(lo->ldo_comp_entries,
 580                         sizeof(*lo->ldo_comp_entries) * comp_count);
 581         if (lo->ldo_comp_entries == NULL) {
 582                 OBD_FREE_PTR_ARRAY(lo->ldo_mirrors, mirror_count);
 583                 lo->ldo_mirrors = NULL;
 584                 lo->ldo_mirror_count = 0;
 585                 return -ENOMEM;
 586         }
 587
 588         lo->ldo_comp_cnt = comp_count;
 589         lo->ldo_is_foreign = 0;
 590         return 0;
 591 }
 592
 593 int lod_fill_mirrors(struct lod_object *lo)
 594 {
 595         struct lod_device *lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 596         struct lod_layout_component *lod_comp;
 597         bool found_preferred = false;
 598         int mirror_idx = -1;
 599         __u16 mirror_id = 0xffff;
 600         int i, pref;
 601         ENTRY;
 602
 603         LASSERT(equi(!lo->ldo_is_composite, lo->ldo_mirror_count == 0));
 604
 605         if (!lo->ldo_is_composite)
 606                 RETURN(0);
 607
 608         lod_comp = &lo->ldo_comp_entries[0];
 609
 610         for (i = 0; i < lo->ldo_comp_cnt; i++, lod_comp++) {
 611                 bool stale = lod_comp->llc_flags & LCME_FL_STALE;
 612                 bool preferred = lod_comp->llc_flags & LCME_FL_PREF_WR;
 613                 bool init = lod_comp_inited(lod_comp);
 614                 int j;
 615
 616                 pref = 0;
 617                 /* calculate component preference over all used OSTs */
 618                 for (j = 0; init && j < lod_comp->llc_stripes_allocated; j++) {
 619                         __u32 idx = lod_comp->llc_ost_indices[j];
 620                         struct lod_tgt_desc *ltd;
 621
 622                         if (unlikely(idx > lod->lod_ost_descs.ltd_tgts_size)) {
 623                                 CERROR("%s: "DFID" OST idx %u > max %u\n",
 624                                        lod2obd(lod)->obd_name,
 625                                        PFID(lu_object_fid(&lo->ldo_obj.do_lu)),
 626                                        idx, lod->lod_ost_descs.ltd_tgts_size);
 627                                 continue;
 628                         }
 629                         ltd = OST_TGT(lod, idx);
 630                         if (unlikely(!ltd)) {
 631                                 CERROR("%s: "DFID" OST idx %u is NULL\n",
 632                                        lod2obd(lod)->obd_name,
 633                                        PFID(lu_object_fid(&lo->ldo_obj.do_lu)),
 634                                        idx);
 635                                 continue;
 636                         }
 637
 638                         if (ltd->ltd_statfs.os_state & OS_STATFS_NONROT)
 639                                 pref++;
 640                 }
 641
 642                 if (mirror_id_of(lod_comp->llc_id) == mirror_id) {
 643                         lo->ldo_mirrors[mirror_idx].lme_stale |= stale;
 644                         lo->ldo_mirrors[mirror_idx].lme_prefer |= preferred;
 645                         lo->ldo_mirrors[mirror_idx].lme_preference += pref;
 646                         lo->ldo_mirrors[mirror_idx].lme_end = i;
 647                         continue;
 648                 }
 649
 650                 if (mirror_idx >= 0 && preferred &&
 651                     !lo->ldo_mirrors[mirror_idx].lme_stale)
 652                         found_preferred = true;
 653
 654                 /* new mirror */
 655                 ++mirror_idx;
 656                 if (mirror_idx >= lo->ldo_mirror_count)
 657                         RETURN(-EINVAL);
 658
 659                 mirror_id = mirror_id_of(lod_comp->llc_id);
 660
 661                 lo->ldo_mirrors[mirror_idx].lme_id = mirror_id;
 662                 lo->ldo_mirrors[mirror_idx].lme_stale = stale;
 663                 lo->ldo_mirrors[mirror_idx].lme_prefer = preferred;
 664                 lo->ldo_mirrors[mirror_idx].lme_preference = pref;
 665                 lo->ldo_mirrors[mirror_idx].lme_start = i;
 666                 lo->ldo_mirrors[mirror_idx].lme_end = i;
 667         }
 668         if (mirror_idx != lo->ldo_mirror_count - 1)
 669                 RETURN(-EINVAL);
 670
 671         if (!found_preferred && mirror_idx > 0) {
 672                 int best = -1;
 673
 674                 /*
 675                  * if no explicited preferred found, then find a mirror
 676                  * with higher number of non-rotational OSTs
 677                  * */
 678                 pref = -1;
 679                 for (i = 0; i <= mirror_idx; i++) {
 680                         if (lo->ldo_mirrors[i].lme_stale)
 681                                 continue;
 682                         if (lo->ldo_mirrors[i].lme_preference > pref) {
 683                                 pref = lo->ldo_mirrors[i].lme_preference;
 684                                 best = i;
 685                         }
 686                 }
 687
 688                 LASSERT(best >= 0);
 689                 lo->ldo_mirrors[best].lme_prefer = 1;
 690         }
 691
 692         RETURN(0);
 693 }
 694
 695 /**
 696  * Generate on-disk lov_mds_md structure for each layout component based on
 697  * the information in lod_object->ldo_comp_entries[i].
 698  *
 699  * \param[in] env               execution environment for this thread
 700  * \param[in] lo                LOD object
 701  * \param[in] comp_idx          index of ldo_comp_entries
 702  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 703  * \param[in|out] lmm_size      buffer size/lmm size
 704  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 705  *                              the stripe info is from the default stripe
 706  *                              template, which is collected in lod_ah_init(),
 707  *                              either from parent object or root object; for
 708  *                              file case, it's from the @lo object
 709  *
 710  * \retval                      0 if on disk structure is created successfully
 711  * \retval                      negative error number on failure
 712  */
 713 static int lod_gen_component_ea(const struct lu_env *env,
 714                                 struct lod_object *lo, int comp_idx,
 715                                 struct lov_mds_md *lmm, int *lmm_size,
 716                                 bool is_dir)
 717 {
 718         struct lod_thread_info  *info = lod_env_info(env);
 719         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
 720         struct lod_device       *lod;
 721         struct lov_ost_data_v1  *objs;
 722         struct lod_layout_component *lod_comp;
 723         __u32   magic;
 724         __u16 stripe_count;
 725         int     i, rc = 0;
 726         ENTRY;
 727
 728         LASSERT(lo);
 729         if (is_dir)
 730                 lod_comp =
 731                         &lo->ldo_def_striping->lds_def_comp_entries[comp_idx];
 732         else
 733                 lod_comp = &lo->ldo_comp_entries[comp_idx];
 734
 735         magic = lod_comp->llc_pool != NULL ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
 736         if (lod_comp->llc_pattern == 0) /* default striping */
 737                 lod_comp->llc_pattern = LOV_PATTERN_RAID0;
 738
 739         lmm->lmm_magic = cpu_to_le32(magic);
 740         lmm->lmm_pattern = cpu_to_le32(lod_comp->llc_pattern);
 741         fid_to_lmm_oi(fid, &lmm->lmm_oi);
 742         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
 743                 lmm->lmm_oi.oi.oi_id++;
 744         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
 745
 746         lmm->lmm_stripe_size = cpu_to_le32(lod_comp->llc_stripe_size);
 747         lmm->lmm_stripe_count = cpu_to_le16(lod_comp->llc_stripe_count);
 748         /**
 749          * for dir and uninstantiated component, lmm_layout_gen stores
 750          * default stripe offset.
 751          */
 752         lmm->lmm_layout_gen =
 753                 (is_dir || !lod_comp_inited(lod_comp)) ?
 754                         cpu_to_le16(lod_comp->llc_stripe_offset) :
 755                         cpu_to_le16(lod_comp->llc_layout_gen);
 756
 757         if (magic == LOV_MAGIC_V1) {
 758                 objs = &lmm->lmm_objects[0];
 759         } else {
 760                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
 761                 size_t cplen = strlcpy(v3->lmm_pool_name,
 762                                        lod_comp->llc_pool,
 763                                        sizeof(v3->lmm_pool_name));
 764                 if (cplen >= sizeof(v3->lmm_pool_name))
 765                         RETURN(-E2BIG);
 766                 objs = &v3->lmm_objects[0];
 767         }
 768         lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 769         stripe_count = lod_comp_entry_stripe_count(lo, comp_idx, is_dir);
 770         if (stripe_count == 0 && !is_dir &&
 771             !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
 772             !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
 773                 /* Try again if all active targets are disconnected.
 774                  * It is possible when MDS does failover. */
 775                 if (!lod->lod_ost_active_count &&
 776                     lod->lod_ost_count)
 777                         RETURN(-EAGAIN);
 778                 RETURN(-E2BIG);
 779         }
 780
 781         if (!is_dir && lo->ldo_is_composite)
 782                 lod_comp_shrink_stripe_count(lod_comp, &stripe_count);
 783
 784         if (is_dir || lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED)
 785                 GOTO(done, rc = 0);
 786
 787         /* generate ost_idx of this component stripe */
 788         for (i = 0; i < stripe_count; i++) {
 789                 struct dt_object *object;
 790                 __u32 ost_idx = (__u32)-1UL;
 791                 int type = LU_SEQ_RANGE_OST;
 792
 793                 if (lod_comp->llc_stripe && lod_comp->llc_stripe[i]) {
 794                         object = lod_comp->llc_stripe[i];
 795                         /* instantiated component */
 796                         info->lti_fid = *lu_object_fid(&object->do_lu);
 797
 798                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF) &&
 799                             comp_idx == 0) {
 800                                 if (cfs_fail_val == 0)
 801                                         cfs_fail_val = info->lti_fid.f_oid;
 802                                 else if (i == 0)
 803                                         info->lti_fid.f_oid = cfs_fail_val;
 804                         }
 805
 806                         rc = fid_to_ostid(&info->lti_fid, &info->lti_ostid);
 807                         LASSERT(rc == 0);
 808
 809                         ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 810                         objs[i].l_ost_gen = cpu_to_le32(0);
 811                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FLD_LOOKUP))
 812                                 rc = -ENOENT;
 813                         else
 814                                 rc = lod_fld_lookup(env, lod, &info->lti_fid,
 815                                                     &ost_idx, &type);
 816                         if (rc < 0) {
 817                                 CERROR("%s: Can not locate "DFID": rc = %d\n",
 818                                        lod2obd(lod)->obd_name,
 819                                        PFID(&info->lti_fid), rc);
 820                                 RETURN(rc);
 821                         }
 822                 } else if (lod_comp->llc_ostlist.op_array &&
 823                            lod_comp->llc_ostlist.op_count) {
 824                         /* user specified ost list */
 825                         ost_idx = lod_comp->llc_ostlist.op_array[i];
 826                 }
 827                 /*
 828                  * with un-instantiated or with no specified ost list
 829                  * component, its l_ost_idx does not matter.
 830                  */
 831                 objs[i].l_ost_idx = cpu_to_le32(ost_idx);
 832         }
 833 done:
 834         if (lmm_size != NULL)
 835                 *lmm_size = lov_mds_md_size(stripe_count, magic);
 836         RETURN(rc);
 837 }
 838
 839 /**
 840  * Generate on-disk lov_mds_md structure based on the information in
 841  * the lod_object->ldo_comp_entries.
 842  *
 843  * \param[in] env               execution environment for this thread
 844  * \param[in] lo                LOD object
 845  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 846  * \param[in|out] lmm_size      buffer size/lmm size
 847  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 848  *                              the stripe info is from the default stripe
 849  *                              template, which is collected in lod_ah_init(),
 850  *                              either from parent object or root object; for
 851  *                              file case, it's from the @lo object
 852  *
 853  * \retval                      0 if on disk structure is created successfully
 854  * \retval                      negative error number on failure
 855  */
 856 int lod_generate_lovea(const struct lu_env *env, struct lod_object *lo,
 857                        struct lov_mds_md *lmm, int *lmm_size, bool is_dir)
 858 {
 859         struct lov_comp_md_entry_v1 *lcme;
 860         struct lov_comp_md_v1 *lcm;
 861         struct lod_layout_component *comp_entries;
 862         __u16 comp_cnt, mirror_cnt;
 863         bool is_composite, is_foreign = false;
 864         int i, rc = 0, offset;
 865         ENTRY;
 866
 867         if (is_dir) {
 868                 comp_cnt = lo->ldo_def_striping->lds_def_comp_cnt;
 869                 mirror_cnt = lo->ldo_def_striping->lds_def_mirror_cnt;
 870                 comp_entries = lo->ldo_def_striping->lds_def_comp_entries;
 871                 is_composite =
 872                         lo->ldo_def_striping->lds_def_striping_is_composite;
 873         } else {
 874                 comp_cnt = lo->ldo_comp_cnt;
 875                 mirror_cnt = lo->ldo_mirror_count;
 876                 comp_entries = lo->ldo_comp_entries;
 877                 is_composite = lo->ldo_is_composite;
 878                 is_foreign = lo->ldo_is_foreign;
 879         }
 880
 881         LASSERT(lmm_size != NULL);
 882
 883         if (is_foreign) {
 884                 struct lov_foreign_md *lfm;
 885
 886                 lfm = (struct lov_foreign_md *)lmm;
 887                 memcpy(lfm, lo->ldo_foreign_lov, lo->ldo_foreign_lov_size);
 888                 /* need to store little-endian */
 889                 if (cpu_to_le32(LOV_MAGIC_FOREIGN) != LOV_MAGIC_FOREIGN) {
 890                         __swab32s(&lfm->lfm_magic);
 891                         __swab32s(&lfm->lfm_length);
 892                         __swab32s(&lfm->lfm_type);
 893                         __swab32s(&lfm->lfm_flags);
 894                 }
 895                 *lmm_size = lo->ldo_foreign_lov_size;
 896                 RETURN(0);
 897         }
 898
 899         LASSERT(comp_cnt != 0 && comp_entries != NULL);
 900
 901         if (!is_composite) {
 902                 rc = lod_gen_component_ea(env, lo, 0, lmm, lmm_size, is_dir);
 903                 RETURN(rc);
 904         }
 905
 906         lcm = (struct lov_comp_md_v1 *)lmm;
 907         memset(lcm, 0, sizeof(*lcm));
 908
 909         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_COMP_V1);
 910         lcm->lcm_entry_count = cpu_to_le16(comp_cnt);
 911         lcm->lcm_mirror_count = cpu_to_le16(mirror_cnt - 1);
 912         lcm->lcm_flags = cpu_to_le16(lo->ldo_flr_state);
 913
 914         offset = sizeof(*lcm) + sizeof(*lcme) * comp_cnt;
 915         LASSERT(offset % sizeof(__u64) == 0);
 916
 917         for (i = 0; i < comp_cnt; i++) {
 918                 struct lod_layout_component *lod_comp;
 919                 struct lov_mds_md *sub_md;
 920                 int size;
 921
 922                 lod_comp = &comp_entries[i];
 923                 lcme = &lcm->lcm_entries[i];
 924
 925                 LASSERT(ergo(!is_dir, lod_comp->llc_id != LCME_ID_INVAL));
 926                 lcme->lcme_id = cpu_to_le32(lod_comp->llc_id);
 927
 928                 /* component could be un-inistantiated */
 929                 lcme->lcme_flags = cpu_to_le32(lod_comp->llc_flags);
 930                 if (lod_comp->llc_flags & LCME_FL_NOSYNC)
 931                         lcme->lcme_timestamp =
 932                                 cpu_to_le64(lod_comp->llc_timestamp);
 933                 if (lod_comp->llc_flags & LCME_FL_EXTENSION && !is_dir)
 934                         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_SEL);
 935
 936                 lcme->lcme_extent.e_start =
 937                         cpu_to_le64(lod_comp->llc_extent.e_start);
 938                 lcme->lcme_extent.e_end =
 939                         cpu_to_le64(lod_comp->llc_extent.e_end);
 940                 lcme->lcme_offset = cpu_to_le32(offset);
 941
 942                 sub_md = (struct lov_mds_md *)((char *)lcm + offset);
 943                 rc = lod_gen_component_ea(env, lo, i, sub_md, &size, is_dir);
 944                 if (rc)
 945                         GOTO(out, rc);
 946                 lcme->lcme_size = cpu_to_le32(size);
 947                 offset += size;
 948                 LASSERTF((offset <= *lmm_size) && (offset % sizeof(__u64) == 0),
 949                          "offset:%d lmm_size:%d\n", offset, *lmm_size);
 950         }
 951         lcm->lcm_size = cpu_to_le32(offset);
 952         lcm->lcm_layout_gen = cpu_to_le32(is_dir ? 0 : lo->ldo_layout_gen);
 953
 954         lustre_print_user_md(D_LAYOUT, (struct lov_user_md *)lmm,
 955                              "generate lum");
 956 out:
 957         if (rc == 0)
 958                 *lmm_size = offset;
 959         RETURN(rc);
 960 }
 961
 962 /**
 963  * Get LOV EA.
 964  *
 965  * Fill lti_ea_store buffer in the environment with a value for the given
 966  * EA. The buffer is reallocated if the value doesn't fit.
 967  *
 968  * \param[in,out] env           execution environment for this thread
 969  *                              .lti_ea_store buffer is filled with EA's value
 970  * \param[in] lo                LOD object
 971  * \param[in] name              name of the EA
 972  *
 973  * \retval                      > 0 if EA is fetched successfully
 974  * \retval                      0 if EA is empty
 975  * \retval                      negative error number on failure
 976  */
 977 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
 978                const char *name)
 979 {
 980         struct lod_thread_info  *info = lod_env_info(env);
 981         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 982         int                     rc;
 983         ENTRY;
 984
 985         LASSERT(info);
 986
 987         if (unlikely(info->lti_ea_store == NULL)) {
 988                 /* just to enter in allocation block below */
 989                 rc = -ERANGE;
 990         } else {
 991 repeat:
 992                 info->lti_buf.lb_buf = info->lti_ea_store;
 993                 info->lti_buf.lb_len = info->lti_ea_store_size;
 994                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
 995         }
 996
 997         /* if object is not striped or inaccessible */
 998         if (rc == -ENODATA || rc == -ENOENT)
 999                 RETURN(0);
1000
1001         if (rc == -ERANGE) {
1002                 /* EA doesn't fit, reallocate new buffer */
1003                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
1004                 if (rc == -ENODATA || rc == -ENOENT)
1005                         RETURN(0);
1006                 else if (rc < 0)
1007                         RETURN(rc);
1008
1009                 LASSERT(rc > 0);
1010                 rc = lod_ea_store_resize(info, rc);
1011                 if (rc)
1012                         RETURN(rc);
1013                 goto repeat;
1014         }
1015
1016         RETURN(rc);
1017 }
1018
1019 /**
1020  * Verify the target index is present in the current configuration.
1021  *
1022  * \param[in] md                LOD device where the target table is stored
1023  * \param[in] idx               target's index
1024  *
1025  * \retval                      0 if the index is present
1026  * \retval                      -EINVAL if not
1027  */
1028 int validate_lod_and_idx(struct lod_device *md, __u32 idx)
1029 {
1030         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
1031                      !test_bit(idx, md->lod_ost_bitmap))) {
1032                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
1033                        md->lod_ost_descs.ltd_tgts_size);
1034                 return -EINVAL;
1035         }
1036
1037         if (unlikely(OST_TGT(md, idx) == NULL)) {
1038                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
1039                        lod2obd(md)->obd_name, idx);
1040                 return -EINVAL;
1041         }
1042
1043         if (unlikely(OST_TGT(md, idx)->ltd_tgt == NULL)) {
1044                 CERROR("%s: invalid lod device, for idx: %d\n",
1045                        lod2obd(md)->obd_name , idx);
1046                 return -EINVAL;
1047         }
1048
1049         return 0;
1050 }
1051
1052 /**
1053  * Instantiate objects for stripes.
1054  *
1055  * Allocate and initialize LU-objects representing the stripes. The number
1056  * of the stripes (llc_stripe_count) must be initialized already. The caller
1057  * must ensure nobody else is calling the function on the object at the same
1058  * time. FLDB service must be running to be able to map a FID to the targets
1059  * and find appropriate device representing that target.
1060  *
1061  * \param[in] env               execution environment for this thread
1062  * \param[in,out] lo            LOD object
1063  * \param[in] objs              an array of IDs to creates the objects from
1064  * \param[in] comp_idx          index of ldo_comp_entries
1065  *
1066  * \retval                      0 if the objects are instantiated successfully
1067  * \retval                      negative error number on failure
1068  */
1069 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
1070                            struct lov_ost_data_v1 *objs, int comp_idx)
1071 {
1072         struct lod_layout_component *lod_comp;
1073         struct lod_thread_info *info = lod_env_info(env);
1074         struct lod_device *md;
1075         struct lu_object *o, *n;
1076         struct lu_device *nd;
1077         struct dt_object **stripe = NULL;
1078         __u32 *ost_indices = NULL;
1079         int stripe_len;
1080         int i, rc = 0;
1081         __u32 idx;
1082         ENTRY;
1083
1084         LASSERT(lo != NULL);
1085         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1086
1087         LASSERT(lo->ldo_comp_cnt != 0 && lo->ldo_comp_entries != NULL);
1088         lod_comp = &lo->ldo_comp_entries[comp_idx];
1089
1090         LASSERT(lod_comp->llc_stripe == NULL);
1091         LASSERT(lod_comp->llc_stripe_count > 0);
1092         LASSERT(lod_comp->llc_stripe_size > 0);
1093
1094         stripe_len = lod_comp->llc_stripe_count;
1095         OBD_ALLOC_PTR_ARRAY(stripe, stripe_len);
1096         if (stripe == NULL)
1097                 RETURN(-ENOMEM);
1098         OBD_ALLOC_PTR_ARRAY(ost_indices, stripe_len);
1099         if (!ost_indices)
1100                 GOTO(out, rc = -ENOMEM);
1101
1102         for (i = 0; i < lod_comp->llc_stripe_count; i++) {
1103                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
1104                         continue;
1105
1106                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
1107                 idx = le32_to_cpu(objs[i].l_ost_idx);
1108                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
1109                 if (rc != 0)
1110                         GOTO(out, rc);
1111                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
1112                          PFID(&info->lti_fid));
1113                 lod_getref(&md->lod_ost_descs);
1114
1115                 rc = validate_lod_and_idx(md, idx);
1116                 if (unlikely(rc != 0)) {
1117                         lod_putref(md, &md->lod_ost_descs);
1118                         GOTO(out, rc);
1119                 }
1120
1121                 nd = &OST_TGT(md, idx)->ltd_tgt->dd_lu_dev;
1122                 lod_putref(md, &md->lod_ost_descs);
1123
1124                 /* In the function below, .hs_keycmp resolves to
1125                  * u_obj_hop_keycmp() */
1126                 /* coverity[overrun-buffer-val] */
1127                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
1128                 if (IS_ERR(o))
1129                         GOTO(out, rc = PTR_ERR(o));
1130
1131                 n = lu_object_locate(o->lo_header, nd->ld_type);
1132                 LASSERT(n);
1133
1134                 stripe[i] = container_of(n, struct dt_object, do_lu);
1135                 ost_indices[i] = idx;
1136         }
1137
1138 out:
1139         if (rc != 0) {
1140                 for (i = 0; i < stripe_len; i++)
1141                         if (stripe[i] != NULL)
1142                                 dt_object_put(env, stripe[i]);
1143
1144                 OBD_FREE_PTR_ARRAY(stripe, stripe_len);
1145                 lod_comp->llc_stripe_count = 0;
1146                 if (ost_indices)
1147                         OBD_FREE_PTR_ARRAY(ost_indices, stripe_len);
1148         } else {
1149                 lod_comp->llc_stripe = stripe;
1150                 lod_comp->llc_ost_indices = ost_indices;
1151                 lod_comp->llc_stripes_allocated = stripe_len;
1152         }
1153
1154         RETURN(rc);
1155 }
1156
1157 /**
1158  * Instantiate objects for striping.
1159  *
1160  * Parse striping information in \a buf and instantiate the objects
1161  * representing the stripes.
1162  *
1163  * \param[in] env               execution environment for this thread
1164  * \param[in] lo                LOD object
1165  * \param[in] buf               buffer storing LOV EA to parse
1166  * \param[in] lvf               verify flags when parsing the layout
1167  *
1168  * \retval                      0 if parsing and objects creation succeed
1169  * \retval                      negative error number on failure
1170  */
1171 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
1172                        const struct lu_buf *buf, enum layout_verify_flags lvf)
1173 {
1174         struct lod_device *d = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1175         struct lov_mds_md_v1 *lmm;
1176         struct lov_comp_md_v1 *comp_v1 = NULL;
1177         struct lov_foreign_md *foreign = NULL;
1178         struct lov_ost_data_v1 *objs;
1179         __u32 magic, pattern;
1180         __u16 mirror_cnt = 0;
1181         __u16 comp_cnt;
1182         int i, rc;
1183         __u16 mirror_id = MIRROR_ID_NEG;
1184         bool stale = false;
1185         int stale_mirrors = 0;
1186         ENTRY;
1187
1188         LASSERT(buf);
1189         LASSERT(buf->lb_buf);
1190         LASSERT(buf->lb_len);
1191         LASSERT(mutex_is_locked(&lo->ldo_layout_mutex));
1192
1193         lmm = (struct lov_mds_md_v1 *)buf->lb_buf;
1194         magic = le32_to_cpu(lmm->lmm_magic);
1195
1196         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3 &&
1197             magic != LOV_MAGIC_COMP_V1 && magic != LOV_MAGIC_FOREIGN &&
1198             magic != LOV_MAGIC_SEL)
1199                 GOTO(out, rc = -EINVAL);
1200
1201         lod_striping_free_nolock(env, lo);
1202
1203         if (magic == LOV_MAGIC_COMP_V1 || magic == LOV_MAGIC_SEL) {
1204                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
1205                 comp_cnt = le16_to_cpu(comp_v1->lcm_entry_count);
1206                 if (comp_cnt == 0)
1207                         GOTO(out, rc = -EINVAL);
1208                 lo->ldo_layout_gen = le32_to_cpu(comp_v1->lcm_layout_gen);
1209                 lo->ldo_is_composite = 1;
1210                 mirror_cnt = le16_to_cpu(comp_v1->lcm_mirror_count) + 1;
1211                 if (mirror_cnt > 1)
1212                         lo->ldo_flr_state = le16_to_cpu(comp_v1->lcm_flags) &
1213                                                         LCM_FL_FLR_MASK;
1214                 else
1215                         lo->ldo_flr_state = LCM_FL_NONE;
1216         } else if (magic == LOV_MAGIC_FOREIGN) {
1217                 size_t length;
1218
1219                 foreign = (struct lov_foreign_md *)buf->lb_buf;
1220                 length = offsetof(typeof(*foreign), lfm_value);
1221                 if (buf->lb_len < length ||
1222                     buf->lb_len < (length + le32_to_cpu(foreign->lfm_length))) {
1223                         CDEBUG(D_LAYOUT,
1224                                "buf len %zu too small for lov_foreign_md\n",
1225                                buf->lb_len);
1226                         GOTO(out, rc = -EINVAL);
1227                 }
1228
1229                 /* just cache foreign LOV EA raw */
1230                 rc = lod_alloc_foreign_lov(lo, length);
1231                 if (rc)
1232                         GOTO(out, rc);
1233                 memcpy(lo->ldo_foreign_lov, buf->lb_buf, length);
1234                 GOTO(out, rc);
1235         } else {
1236                 comp_cnt = 1;
1237                 lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1238                 lo->ldo_is_composite = 0;
1239         }
1240
1241         rc = lod_alloc_comp_entries(lo, mirror_cnt, comp_cnt);
1242         if (rc)
1243                 GOTO(out, rc);
1244
1245         for (i = 0; i < comp_cnt; i++) {
1246                 struct lod_layout_component *lod_comp;
1247                 struct lu_extent *ext;
1248                 __u32 offs;
1249
1250                 lod_comp = &lo->ldo_comp_entries[i];
1251                 if (lo->ldo_is_composite) {
1252                         offs = le32_to_cpu(comp_v1->lcm_entries[i].lcme_offset);
1253                         lmm = (struct lov_mds_md_v1 *)((char *)comp_v1 + offs);
1254
1255                         ext = &comp_v1->lcm_entries[i].lcme_extent;
1256                         lod_comp->llc_extent.e_start =
1257                                 le64_to_cpu(ext->e_start);
1258                         if (lod_comp->llc_extent.e_start &
1259                             (LOV_MIN_STRIPE_SIZE - 1)) {
1260                                 CDEBUG(D_LAYOUT,
1261                                        "extent start %llu is not a multiple of min size %u\n",
1262                                        lod_comp->llc_extent.e_start,
1263                                        LOV_MIN_STRIPE_SIZE);
1264                                 GOTO(out, rc = -EINVAL);
1265                         }
1266
1267                         lod_comp->llc_extent.e_end = le64_to_cpu(ext->e_end);
1268                         if (lod_comp->llc_extent.e_end != LUSTRE_EOF &&
1269                             lod_comp->llc_extent.e_end &
1270                             (LOV_MIN_STRIPE_SIZE - 1)) {
1271                                 CDEBUG(D_LAYOUT,
1272                                        "extent end %llu is not a multiple of min size %u\n",
1273                                        lod_comp->llc_extent.e_end,
1274                                        LOV_MIN_STRIPE_SIZE);
1275                                 GOTO(out, rc = -EINVAL);
1276                         }
1277
1278                         lod_comp->llc_flags =
1279                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_flags);
1280
1281                         if (lod_comp->llc_flags & LCME_FL_NOSYNC)
1282                                 lod_comp->llc_timestamp = le64_to_cpu(
1283                                         comp_v1->lcm_entries[i].lcme_timestamp);
1284                         lod_comp->llc_id =
1285                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_id);
1286                         if (lod_comp->llc_id == LCME_ID_INVAL)
1287                                 GOTO(out, rc = -EINVAL);
1288
1289                         if (lvf & LVF_ALL_STALE) {
1290                                 if (mirror_id_of(lod_comp->llc_id) ==
1291                                     mirror_id) {
1292                                         /* remaining comps in the mirror */
1293                                         stale |= lod_comp->llc_flags &
1294                                                  LCME_FL_STALE;
1295                                 } else {
1296                                         /*
1297                                          * new mirror, check last mirror's
1298                                          * stale-ness
1299                                          */
1300                                         if (stale)
1301                                                 stale_mirrors++;
1302
1303                                         mirror_id =
1304                                                 mirror_id_of(lod_comp->llc_id);
1305
1306                                         /* the first comp of the new mirror */
1307                                         stale = lod_comp->llc_flags &
1308                                                 LCME_FL_STALE;
1309                                 }
1310                         }
1311
1312                         if ((lod_comp->llc_flags & LCME_FL_EXTENSION) &&
1313                             comp_v1->lcm_magic != cpu_to_le32(LOV_MAGIC_SEL)) {
1314                                 CWARN("%s: EXTENSION flags=%x set on component[%u]=%x of non-SEL file "DFID" with magic=%#08x\n",
1315                                       lod2obd(d)->obd_name,
1316                                       lod_comp->llc_flags, lod_comp->llc_id, i,
1317                                       PFID(lod_object_fid(lo)),
1318                                       le32_to_cpu(comp_v1->lcm_magic));
1319                         }
1320                 } else {
1321                         lod_comp_set_init(lod_comp);
1322                 }
1323
1324                 pattern = le32_to_cpu(lmm->lmm_pattern);
1325                 if (!lov_pattern_supported(lov_pattern(pattern)))
1326                         GOTO(out, rc = -EINVAL);
1327
1328                 lod_comp->llc_pattern = pattern;
1329                 lod_comp->llc_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
1330                 lod_comp->llc_stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
1331                 lod_comp->llc_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1332
1333                 if (lmm->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)) {
1334                         struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
1335
1336                         lod_set_pool(&lod_comp->llc_pool, v3->lmm_pool_name);
1337                         objs = &v3->lmm_objects[0];
1338                 } else {
1339                         lod_set_pool(&lod_comp->llc_pool, NULL);
1340                         objs = &lmm->lmm_objects[0];
1341                 }
1342
1343                 /**
1344                  * If uninstantiated template component has valid l_ost_idx,
1345                  * then user has specified ost list for this component.
1346                  */
1347                 if (!lod_comp_inited(lod_comp)) {
1348                         __u16 stripe_count;
1349
1350                         if (objs[0].l_ost_idx != (__u32)-1UL) {
1351                                 int j;
1352
1353                                 stripe_count = lod_comp_entry_stripe_count(
1354                                                         lo, i, false);
1355                                 if (stripe_count == 0 &&
1356                                     !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1357                                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT))
1358                                         GOTO(out, rc = -E2BIG);
1359                                 /**
1360                                  * load the user specified ost list, when this
1361                                  * component is instantiated later, it will be
1362                                  * used in lod_alloc_ost_list().
1363                                  */
1364                                 lod_comp->llc_ostlist.op_count = stripe_count;
1365                                 lod_comp->llc_ostlist.op_size =
1366                                         stripe_count * sizeof(__u32);
1367                                 OBD_ALLOC(lod_comp->llc_ostlist.op_array,
1368                                           lod_comp->llc_ostlist.op_size);
1369                                 if (!lod_comp->llc_ostlist.op_array)
1370                                         GOTO(out, rc = -ENOMEM);
1371
1372                                 for (j = 0; j < stripe_count; j++)
1373                                         lod_comp->llc_ostlist.op_array[j] =
1374                                                 le32_to_cpu(objs[j].l_ost_idx);
1375
1376                                 /**
1377                                  * this component OST objects starts from the
1378                                  * first ost_idx, lod_alloc_ost_list() will
1379                                  * check this.
1380                                  */
1381                                 lod_comp->llc_stripe_offset = objs[0].l_ost_idx;
1382                         } else {
1383                                 /**
1384                                  * for uninstantiated component,
1385                                  * lmm_layout_gen stores default stripe offset.
1386                                  */
1387                                 lod_comp->llc_stripe_offset =
1388                                                         lmm->lmm_layout_gen;
1389                         }
1390                 }
1391
1392                 /* skip un-instantiated component object initialization */
1393                 if (!lod_comp_inited(lod_comp))
1394                         continue;
1395
1396                 if (!(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1397                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
1398                         rc = lod_initialize_objects(env, lo, objs, i);
1399                         if (rc)
1400                                 GOTO(out, rc);
1401                 }
1402         }
1403
1404         if (lo->ldo_is_composite && (lvf & LVF_ALL_STALE)) {
1405                 /* check the last mirror stale-ness */
1406                 if (stale)
1407                         stale_mirrors++;
1408
1409                 if (mirror_cnt == stale_mirrors) {
1410                         rc = -EPERM;
1411                         CERROR("%s: can not set all stale mirrors for "
1412                                DFID": rc = %d\n",
1413                                lod2obd(d)->obd_name, PFID(lod_object_fid(lo)),
1414                                rc);
1415                         GOTO(out, rc);
1416                 }
1417         }
1418
1419         rc = lod_fill_mirrors(lo);
1420         if (rc)
1421                 GOTO(out, rc);
1422
1423 out:
1424         if (rc)
1425                 lod_striping_free_nolock(env, lo);
1426         RETURN(rc);
1427 }
1428
1429 /**
1430  * Check whether the striping (LOVEA for regular file, LMVEA for directory)
1431  * is already cached.
1432  *
1433  * \param[in] lo        LOD object
1434  *
1435  * \retval              True if the striping is cached, otherwise
1436  *                      return false.
1437  */
1438 static bool lod_striping_loaded(struct lod_object *lo)
1439 {
1440         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1441             lo->ldo_comp_cached)
1442                 return true;
1443
1444         if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1445                 if (lo->ldo_dir_stripe_loaded)
1446                         return true;
1447
1448                 /* Never load LMV stripe for slaves of striped dir */
1449                 if (lo->ldo_dir_slave_stripe)
1450                         return true;
1451         }
1452
1453         return false;
1454 }
1455
1456 /**
1457  * A generic function to initialize the stripe objects.
1458  *
1459  * A protected version of lod_striping_load_locked() - load the striping
1460  * information from storage, parse that and instantiate LU objects to
1461  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1462  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1463  * return an array of references to the newly instantiated objects.
1464  *
1465  * \param[in] env               execution environment for this thread
1466  * \param[in,out] lo            LOD object, where striping is stored and
1467  *                              which gets an array of references
1468  *
1469  * \retval                      0 if parsing and object creation succeed
1470  * \retval                      negative error number on failure
1471  **/
1472 int lod_striping_load(const struct lu_env *env, struct lod_object *lo)
1473 {
1474         struct lod_thread_info *info = lod_env_info(env);
1475         struct dt_object *next = dt_object_child(&lo->ldo_obj);
1476         struct lu_buf *buf = &info->lti_buf;
1477         int rc = 0;
1478
1479         ENTRY;
1480
1481         if (!dt_object_exists(next))
1482                 RETURN(0);
1483
1484         if (lod_striping_loaded(lo))
1485                 RETURN(0);
1486
1487         mutex_lock(&lo->ldo_layout_mutex);
1488         if (lod_striping_loaded(lo))
1489                 GOTO(unlock, rc = 0);
1490
1491         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr)) {
1492                 rc = lod_get_lov_ea(env, lo);
1493                 if (rc <= 0)
1494                         GOTO(unlock, rc);
1495
1496                 /*
1497                  * there is LOV EA (striping information) in this object
1498                  * let's parse it and create in-core objects for the stripes
1499                  */
1500                 buf->lb_buf = info->lti_ea_store;
1501                 buf->lb_len = info->lti_ea_store_size;
1502                 rc = lod_parse_striping(env, lo, buf, 0);
1503                 if (rc == 0)
1504                         lo->ldo_comp_cached = 1;
1505         } else if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1506                 rc = lod_get_lmv_ea(env, lo);
1507                 if (rc > sizeof(struct lmv_foreign_md)) {
1508                         struct lmv_foreign_md *lfm = info->lti_ea_store;
1509
1510                         if (le32_to_cpu(lfm->lfm_magic) == LMV_MAGIC_FOREIGN) {
1511                                 lo->ldo_foreign_lmv = info->lti_ea_store;
1512                                 lo->ldo_foreign_lmv_size =
1513                                         info->lti_ea_store_size;
1514                                 info->lti_ea_store = NULL;
1515                                 info->lti_ea_store_size = 0;
1516
1517                                 lo->ldo_dir_stripe_loaded = 1;
1518                                 lo->ldo_is_foreign = 1;
1519                                 GOTO(unlock, rc = 0);
1520                         }
1521                 }
1522
1523                 if (rc < (int)sizeof(struct lmv_mds_md_v1)) {
1524                         /* Let's set stripe_loaded to avoid further
1525                          * stripe loading especially for non-stripe directory,
1526                          * which can hurt performance. (See LU-9840)
1527                          */
1528                         if (rc == 0)
1529                                 lo->ldo_dir_stripe_loaded = 1;
1530                         GOTO(unlock, rc = rc > 0 ? -EINVAL : rc);
1531                 }
1532                 buf->lb_buf = info->lti_ea_store;
1533                 buf->lb_len = info->lti_ea_store_size;
1534                 if (rc == sizeof(struct lmv_mds_md_v1)) {
1535                         rc = lod_load_lmv_shards(env, lo, buf, true);
1536                         if (buf->lb_buf != info->lti_ea_store) {
1537                                 OBD_FREE_LARGE(info->lti_ea_store,
1538                                                info->lti_ea_store_size);
1539                                 info->lti_ea_store = buf->lb_buf;
1540                                 info->lti_ea_store_size = buf->lb_len;
1541                         }
1542
1543                         if (rc < 0)
1544                                 GOTO(unlock, rc);
1545                 }
1546
1547                 /*
1548                  * there is LMV EA (striping information) in this object
1549                  * let's parse it and create in-core objects for the stripes
1550                  */
1551                 rc = lod_parse_dir_striping(env, lo, buf);
1552                 if (rc == 0)
1553                         lo->ldo_dir_stripe_loaded = 1;
1554         }
1555         EXIT;
1556 unlock:
1557         mutex_unlock(&lo->ldo_layout_mutex);
1558
1559         return rc;
1560 }
1561
1562 int lod_striping_reload(const struct lu_env *env, struct lod_object *lo,
1563                         const struct lu_buf *buf, enum layout_verify_flags lvf)
1564 {
1565         int rc;
1566
1567         ENTRY;
1568
1569         mutex_lock(&lo->ldo_layout_mutex);
1570         rc = lod_parse_striping(env, lo, buf, lvf);
1571         mutex_unlock(&lo->ldo_layout_mutex);
1572
1573         RETURN(rc);
1574 }
1575
1576 /**
1577  * Verify lov_user_md_v1/v3 striping.
1578  *
1579  * Check the validity of all fields including the magic, stripe size,
1580  * stripe count, stripe offset and that the pool is present.  Also check
1581  * that each target index points to an existing target. The additional
1582  * \a is_from_disk turns additional checks. In some cases zero fields
1583  * are allowed (like pattern=0).
1584  *
1585  * \param[in] d                 LOD device
1586  * \param[in] buf               buffer with LOV EA to verify
1587  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1588  *                              1 - from disk, do not allow
1589  *
1590  * \retval                      0 if the striping is valid
1591  * \retval                      -EINVAL if striping is invalid
1592  */
1593 static int lod_verify_v1v3(struct lod_device *d, const struct lu_buf *buf,
1594                            bool is_from_disk)
1595 {
1596         struct lov_user_md_v1   *lum;
1597         struct lov_user_md_v3   *lum3;
1598         struct pool_desc        *pool = NULL;
1599         __u32                    magic;
1600         __u32                    stripe_size;
1601         __u16                    stripe_count;
1602         __u16                    stripe_offset;
1603         size_t                   lum_size;
1604         int                      rc = 0;
1605         ENTRY;
1606
1607         lum = buf->lb_buf;
1608
1609         if (buf->lb_len < sizeof(*lum)) {
1610                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1611                        buf->lb_len);
1612                 GOTO(out, rc = -EINVAL);
1613         }
1614
1615         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1616         if (magic != LOV_USER_MAGIC_V1 &&
1617             magic != LOV_USER_MAGIC_V3 &&
1618             magic != LOV_USER_MAGIC_SPECIFIC) {
1619                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1620                        le32_to_cpu(lum->lmm_magic));
1621                 GOTO(out, rc = -EINVAL);
1622         }
1623
1624         /* the user uses "0" for default stripe pattern normally. */
1625         if (!is_from_disk && lum->lmm_pattern == LOV_PATTERN_NONE)
1626                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1627
1628         if (!lov_pattern_supported(le32_to_cpu(lum->lmm_pattern))) {
1629                 CDEBUG(D_LAYOUT, "bad userland stripe pattern: %#x\n",
1630                        le32_to_cpu(lum->lmm_pattern));
1631                 GOTO(out, rc = -EINVAL);
1632         }
1633
1634         /* a released lum comes from creating orphan on hsm release,
1635          * doesn't make sense to verify it. */
1636         if (le32_to_cpu(lum->lmm_pattern) & LOV_PATTERN_F_RELEASED)
1637                 GOTO(out, rc = 0);
1638
1639         /* 64kB is the largest common page size we see (ia64), and matches the
1640          * check in lfs */
1641         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1642         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1643                 CDEBUG(D_LAYOUT, "stripe size %u not a multiple of %u\n",
1644                        stripe_size, LOV_MIN_STRIPE_SIZE);
1645                 GOTO(out, rc = -EINVAL);
1646         }
1647
1648         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1649         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT &&
1650             lov_pattern(le32_to_cpu(lum->lmm_pattern)) != LOV_PATTERN_MDT) {
1651                 /* if offset is not within valid range [0, osts_size) */
1652                 if (stripe_offset >= d->lod_ost_descs.ltd_tgts_size) {
1653                         CDEBUG(D_LAYOUT, "stripe offset %u >= bitmap size %u\n",
1654                                stripe_offset, d->lod_ost_descs.ltd_tgts_size);
1655                         GOTO(out, rc = -EINVAL);
1656                 }
1657
1658                 /* if lmm_stripe_offset is *not* in bitmap */
1659                 if (!test_bit(stripe_offset, d->lod_ost_bitmap)) {
1660                         CDEBUG(D_LAYOUT, "stripe offset %u not in bitmap\n",
1661                                stripe_offset);
1662                         GOTO(out, rc = -EINVAL);
1663                 }
1664         }
1665
1666         if (magic == LOV_USER_MAGIC_V1)
1667                 lum_size = offsetof(struct lov_user_md_v1,
1668                                     lmm_objects[0]);
1669         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC)
1670                 lum_size = offsetof(struct lov_user_md_v3,
1671                                     lmm_objects[0]);
1672         else
1673                 GOTO(out, rc = -EINVAL);
1674
1675         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1676         if (buf->lb_len < lum_size) {
1677                 CDEBUG(D_LAYOUT, "invalid buf len %zu/%zu for lov_user_md with "
1678                        "magic %#x and stripe_count %u\n",
1679                        buf->lb_len, lum_size, magic, stripe_count);
1680                 GOTO(out, rc = -EINVAL);
1681         }
1682
1683         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC))
1684                 goto out;
1685
1686         lum3 = buf->lb_buf;
1687         /* In the function below, .hs_keycmp resolves to
1688          * pool_hashkey_keycmp() */
1689         /* coverity[overrun-buffer-val] */
1690         pool = lod_find_pool(d, lum3->lmm_pool_name);
1691         if (pool == NULL)
1692                 goto out;
1693
1694         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT) {
1695                 rc = lod_check_index_in_pool(stripe_offset, pool);
1696                 if (rc < 0)
1697                         GOTO(out, rc = -EINVAL);
1698         }
1699
1700         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1701                 CDEBUG(D_LAYOUT, "stripe count %u > # OSTs %u in the pool\n",
1702                        stripe_count, pool_tgt_count(pool));
1703                 GOTO(out, rc = -EINVAL);
1704         }
1705
1706 out:
1707         if (pool != NULL)
1708                 lod_pool_putref(pool);
1709
1710         RETURN(rc);
1711 }
1712
1713 static inline
1714 struct lov_comp_md_entry_v1 *comp_entry_v1(struct lov_comp_md_v1 *comp, int i)
1715 {
1716         LASSERTF((le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1717                  LOV_USER_MAGIC_COMP_V1 ||
1718                  (le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1719                  LOV_USER_MAGIC_SEL, "Wrong magic %x\n",
1720                  le32_to_cpu(comp->lcm_magic));
1721         LASSERTF(i >= 0 && i < le16_to_cpu(comp->lcm_entry_count),
1722                  "bad index %d, max = %d\n",
1723                  i, le16_to_cpu(comp->lcm_entry_count));
1724
1725         return &comp->lcm_entries[i];
1726 }
1727
1728 #define for_each_comp_entry_v1(comp, entry) \
1729         for (entry = comp_entry_v1(comp, 0); \
1730              entry <= comp_entry_v1(comp, \
1731                                    le16_to_cpu(comp->lcm_entry_count) - 1); \
1732              entry++)
1733
1734 int lod_erase_dom_stripe(struct lov_comp_md_v1 *comp_v1,
1735                          struct lov_comp_md_entry_v1 *dom_ent)
1736 {
1737         struct lov_comp_md_entry_v1 *ent;
1738         __u16 entries;
1739         __u32 dom_off, dom_size, comp_size, off;
1740         void *src, *dst;
1741         unsigned int size, shift;
1742
1743         entries = le16_to_cpu(comp_v1->lcm_entry_count) - 1;
1744         LASSERT(entries > 0);
1745         comp_v1->lcm_entry_count = cpu_to_le16(entries);
1746
1747         comp_size = le32_to_cpu(comp_v1->lcm_size);
1748         dom_off = le32_to_cpu(dom_ent->lcme_offset);
1749         dom_size = le32_to_cpu(dom_ent->lcme_size);
1750
1751         /* all entries offsets are shifted by entry size at least */
1752         shift = sizeof(*dom_ent);
1753         for_each_comp_entry_v1(comp_v1, ent) {
1754                 off = le32_to_cpu(ent->lcme_offset);
1755                 if (off == dom_off) {
1756                         /* Entry deletion creates two holes in layout data:
1757                          * - hole in entries array
1758                          * - hole in layout data at dom_off with dom_size
1759                          *
1760                          * First memmove is one entry shift from next entry
1761                          * start with size up to dom_off in blob
1762                          */
1763                         dst = (void *)ent;
1764                         src = (void *)(ent + 1);
1765                         size = (unsigned long)((void *)comp_v1 + dom_off - src);
1766                         memmove(dst, src, size);
1767                         /* take 'off' from just moved entry */
1768                         off = le32_to_cpu(ent->lcme_offset);
1769                         /* second memmove is blob tail after 'off' up to
1770                          * component end
1771                          */
1772                         dst = (void *)comp_v1 + dom_off - sizeof(*ent);
1773                         src = (void *)comp_v1 + off;
1774                         size = (unsigned long)(comp_size - off);
1775                         memmove(dst, src, size);
1776                         /* all entries offsets after DoM entry are shifted by
1777                          * dom_size additionally
1778                          */
1779                         shift += dom_size;
1780                 }
1781                 ent->lcme_offset = cpu_to_le32(off - shift);
1782         }
1783         comp_v1->lcm_size = cpu_to_le32(comp_size - shift);
1784
1785         /* notify a caller to re-check entry */
1786         return -ERESTART;
1787 }
1788
1789 void lod_dom_stripesize_recalc(struct lod_device *d)
1790 {
1791         __u64 threshold_mb = d->lod_dom_threshold_free_mb;
1792         __u32 max_size = d->lod_dom_stripesize_max_kb;
1793         __u32 def_size = d->lod_dom_stripesize_cur_kb;
1794
1795         /* use maximum allowed value if free space is above threshold */
1796         if (d->lod_lsfs_free_mb >= threshold_mb) {
1797                 def_size = max_size;
1798         } else if (!d->lod_lsfs_free_mb || max_size <= LOD_DOM_MIN_SIZE_KB) {
1799                 def_size = 0;
1800         } else {
1801                 /* recalc threshold like it would be with def_size as max */
1802                 threshold_mb = mult_frac(threshold_mb, def_size, max_size);
1803                 if (d->lod_lsfs_free_mb < threshold_mb)
1804                         def_size = rounddown(def_size / 2, LOD_DOM_MIN_SIZE_KB);
1805                 else if (d->lod_lsfs_free_mb > threshold_mb * 2)
1806                         def_size = max_t(unsigned int, def_size * 2,
1807                                          LOD_DOM_MIN_SIZE_KB);
1808         }
1809
1810         if (d->lod_dom_stripesize_cur_kb != def_size) {
1811                 CDEBUG(D_LAYOUT, "Change default DOM stripe size %d->%d\n",
1812                        d->lod_dom_stripesize_cur_kb, def_size);
1813                 d->lod_dom_stripesize_cur_kb = def_size;
1814         }
1815 }
1816
1817 static __u32 lod_dom_stripesize_limit(const struct lu_env *env,
1818                                       struct lod_device *d)
1819 {
1820         int rc;
1821
1822         /* set bfree as fraction of total space */
1823         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_SPOOF)) {
1824                 spin_lock(&d->lod_lsfs_lock);
1825                 d->lod_lsfs_free_mb = mult_frac(d->lod_lsfs_total_mb,
1826                                         min_t(int, cfs_fail_val, 100), 100);
1827                 GOTO(recalc, rc = 0);
1828         }
1829
1830         if (d->lod_lsfs_age < ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE) {
1831                 struct obd_statfs sfs;
1832
1833                 spin_lock(&d->lod_lsfs_lock);
1834                 if (d->lod_lsfs_age > ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE)
1835                         GOTO(unlock, rc = 0);
1836
1837                 d->lod_lsfs_age = ktime_get_seconds();
1838                 spin_unlock(&d->lod_lsfs_lock);
1839                 rc = dt_statfs(env, d->lod_child, &sfs);
1840                 if (rc) {
1841                         CDEBUG(D_LAYOUT,
1842                                "%s: failed to get OSD statfs: rc = %d\n",
1843                                lod2obd(d)->obd_name, rc);
1844                         GOTO(out, rc);
1845                 }
1846                 /* udpate local OSD cached statfs data */
1847                 spin_lock(&d->lod_lsfs_lock);
1848                 d->lod_lsfs_total_mb = (sfs.os_blocks * sfs.os_bsize) >> 20;
1849                 d->lod_lsfs_free_mb = (sfs.os_bfree * sfs.os_bsize) >> 20;
1850 recalc:
1851                 lod_dom_stripesize_recalc(d);
1852 unlock:
1853                 spin_unlock(&d->lod_lsfs_lock);
1854         }
1855 out:
1856         return d->lod_dom_stripesize_cur_kb << 10;
1857 }
1858
1859 int lod_dom_stripesize_choose(const struct lu_env *env, struct lod_device *d,
1860                               struct lov_comp_md_v1 *comp_v1,
1861                               struct lov_comp_md_entry_v1 *dom_ent,
1862                               __u32 stripe_size)
1863 {
1864         struct lov_comp_md_entry_v1 *ent;
1865         struct lu_extent *dom_ext, *ext;
1866         struct lov_user_md_v1 *lum;
1867         __u32 max_stripe_size;
1868         __u16 mid, dom_mid;
1869         int rc = 0;
1870         bool dom_next_entry = false;
1871
1872         dom_ext = &dom_ent->lcme_extent;
1873         dom_mid = mirror_id_of(le32_to_cpu(dom_ent->lcme_id));
1874         max_stripe_size = lod_dom_stripesize_limit(env, d);
1875
1876         /* Check stripe size againts current per-MDT limit */
1877         if (stripe_size <= max_stripe_size)
1878                 return 0;
1879
1880         lum = (void *)comp_v1 + le32_to_cpu(dom_ent->lcme_offset);
1881         CDEBUG(D_LAYOUT, "overwrite DoM component size %u with MDT limit %u\n",
1882                stripe_size, max_stripe_size);
1883         lum->lmm_stripe_size = cpu_to_le32(max_stripe_size);
1884
1885         /* In common case the DoM stripe is first entry in a mirror and
1886          * can be deleted only if it is not single entry in layout or
1887          * mirror, otherwise error should be returned.
1888          */
1889         for_each_comp_entry_v1(comp_v1, ent) {
1890                 if (ent == dom_ent)
1891                         continue;
1892
1893                 mid = mirror_id_of(le32_to_cpu(ent->lcme_id));
1894                 if (mid != dom_mid)
1895                         continue;
1896
1897                 ext = &ent->lcme_extent;
1898                 if (ext->e_start != dom_ext->e_end)
1899                         continue;
1900
1901                 /* Found next component after the DoM one with the same
1902                  * mirror_id and adjust its start with DoM component end.
1903                  *
1904                  * NOTE: we are considering here that there can be only one
1905                  * DoM component in a file, all replicas are located on OSTs
1906                  * always and don't need adjustment since use own layouts.
1907                  */
1908                 ext->e_start = cpu_to_le64(max_stripe_size);
1909                 dom_next_entry = true;
1910                 break;
1911         }
1912
1913         if (max_stripe_size == 0) {
1914                 /* DoM component size is zero due to server setting, remove
1915                  * it from the layout but only if next component exists in
1916                  * the same mirror. That must be checked prior calling the
1917                  * lod_erase_dom_stripe().
1918                  */
1919                 if (!dom_next_entry)
1920                         return -EFBIG;
1921
1922                 rc = lod_erase_dom_stripe(comp_v1, dom_ent);
1923         } else {
1924                 /* Update DoM extent end finally */
1925                 dom_ext->e_end = cpu_to_le64(max_stripe_size);
1926         }
1927
1928         return rc;
1929 }
1930
1931 /**
1932  * Verify LOV striping.
1933  *
1934  * \param[in] d                 LOD device
1935  * \param[in] buf               buffer with LOV EA to verify
1936  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1937  *                              1 - from disk, do not allow
1938  * \param[in] start             extent start for composite layout
1939  *
1940  * \retval                      0 if the striping is valid
1941  * \retval                      -EINVAL if striping is invalid
1942  */
1943 int lod_verify_striping(const struct lu_env *env, struct lod_device *d,
1944                         struct lod_object *lo, const struct lu_buf *buf,
1945                         bool is_from_disk)
1946 {
1947         struct lov_user_md_v1   *lum;
1948         struct lov_comp_md_v1   *comp_v1;
1949         struct lov_comp_md_entry_v1     *ent;
1950         struct lu_extent        *ext;
1951         struct lu_buf   tmp;
1952         __u64   prev_end = 0;
1953         __u32   stripe_size = 0;
1954         __u16   prev_mid = -1, mirror_id = -1;
1955         __u32   mirror_count;
1956         __u32   magic;
1957         int     rc = 0;
1958         ENTRY;
1959
1960         if (buf->lb_len < sizeof(lum->lmm_magic)) {
1961                 CDEBUG(D_LAYOUT, "invalid buf len %zu\n", buf->lb_len);
1962                 RETURN(-EINVAL);
1963         }
1964
1965         lum = buf->lb_buf;
1966
1967         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1968         /* treat foreign LOV EA/object case first
1969          * XXX is it expected to try setting again a foreign?
1970          * XXX should we care about different current vs new layouts ?
1971          */
1972         if (unlikely(magic == LOV_USER_MAGIC_FOREIGN)) {
1973                 struct lov_foreign_md *lfm = buf->lb_buf;
1974
1975                 if (buf->lb_len < offsetof(typeof(*lfm), lfm_value)) {
1976                         CDEBUG(D_LAYOUT,
1977                                "buf len %zu < min lov_foreign_md size (%zu)\n",
1978                                buf->lb_len, offsetof(typeof(*lfm),
1979                                lfm_value));
1980                         RETURN(-EINVAL);
1981                 }
1982
1983                 if (foreign_size_le(lfm) > buf->lb_len) {
1984                         CDEBUG(D_LAYOUT,
1985                                "buf len %zu < this lov_foreign_md size (%zu)\n",
1986                                buf->lb_len, foreign_size_le(lfm));
1987                         RETURN(-EINVAL);
1988                 }
1989                 /* Don't do anything with foreign layouts */
1990                 RETURN(0);
1991         }
1992
1993         /* normal LOV/layout cases */
1994
1995         if (buf->lb_len < sizeof(*lum)) {
1996                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1997                        buf->lb_len);
1998                 RETURN(-EINVAL);
1999         }
2000
2001         switch (magic) {
2002         case LOV_USER_MAGIC_FOREIGN:
2003                 RETURN(0);
2004         case LOV_USER_MAGIC_V1:
2005         case LOV_USER_MAGIC_V3:
2006         case LOV_USER_MAGIC_SPECIFIC:
2007                 RETURN(lod_verify_v1v3(d, buf, is_from_disk));
2008         case LOV_USER_MAGIC_COMP_V1:
2009         case LOV_USER_MAGIC_SEL:
2010                 break;
2011         default:
2012                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
2013                        le32_to_cpu(lum->lmm_magic));
2014                 RETURN(-EINVAL);
2015         }
2016
2017         /* magic == LOV_USER_MAGIC_COMP_V1 */
2018         comp_v1 = buf->lb_buf;
2019         if (buf->lb_len < le32_to_cpu(comp_v1->lcm_size)) {
2020                 CDEBUG(D_LAYOUT, "buf len %zu is less than %u\n",
2021                        buf->lb_len, le32_to_cpu(comp_v1->lcm_size));
2022                 RETURN(-EINVAL);
2023         }
2024
2025 recheck:
2026         mirror_count = 0;
2027         if (le16_to_cpu(comp_v1->lcm_entry_count) == 0) {
2028                 CDEBUG(D_LAYOUT, "entry count is zero\n");
2029                 RETURN(-EINVAL);
2030         }
2031
2032         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
2033             lo->ldo_comp_cnt > 0) {
2034                 /* could be called from lustre.lov.add */
2035                 __u32 cnt = lo->ldo_comp_cnt;
2036
2037                 ext = &lo->ldo_comp_entries[cnt - 1].llc_extent;
2038                 prev_end = ext->e_end;
2039
2040                 ++mirror_count;
2041         }
2042
2043         for_each_comp_entry_v1(comp_v1, ent) {
2044                 ext = &ent->lcme_extent;
2045
2046                 if (le64_to_cpu(ext->e_start) > le64_to_cpu(ext->e_end) ||
2047                     le64_to_cpu(ext->e_start) & (LOV_MIN_STRIPE_SIZE - 1) ||
2048                     (le64_to_cpu(ext->e_end) != LUSTRE_EOF &&
2049                     le64_to_cpu(ext->e_end) & (LOV_MIN_STRIPE_SIZE - 1))) {
2050                         CDEBUG(D_LAYOUT, "invalid extent "DEXT"\n",
2051                                le64_to_cpu(ext->e_start),
2052                                le64_to_cpu(ext->e_end));
2053                         RETURN(-EINVAL);
2054                 }
2055
2056                 if (is_from_disk) {
2057                         /* lcme_id contains valid value */
2058                         if (le32_to_cpu(ent->lcme_id) == 0 ||
2059                             le32_to_cpu(ent->lcme_id) > LCME_ID_MAX) {
2060                                 CDEBUG(D_LAYOUT, "invalid id %u\n",
2061                                        le32_to_cpu(ent->lcme_id));
2062                                 RETURN(-EINVAL);
2063                         }
2064
2065                         if (le16_to_cpu(comp_v1->lcm_mirror_count) > 0) {
2066                                 mirror_id = mirror_id_of(
2067                                                 le32_to_cpu(ent->lcme_id));
2068
2069                                 /* first component must start with 0 */
2070                                 if (mirror_id != prev_mid &&
2071                                     le64_to_cpu(ext->e_start) != 0) {
2072                                         CDEBUG(D_LAYOUT,
2073                                                "invalid start:%llu, expect:0\n",
2074                                                le64_to_cpu(ext->e_start));
2075                                         RETURN(-EINVAL);
2076                                 }
2077
2078                                 prev_mid = mirror_id;
2079                         }
2080                 }
2081
2082                 if (le64_to_cpu(ext->e_start) == 0) {
2083                         ++mirror_count;
2084                         prev_end = 0;
2085                 }
2086
2087                 /* the next must be adjacent with the previous one */
2088                 if (le64_to_cpu(ext->e_start) != prev_end) {
2089                         CDEBUG(D_LAYOUT,
2090                                "invalid start actual:%llu, expect:%llu\n",
2091                                le64_to_cpu(ext->e_start), prev_end);
2092                         RETURN(-EINVAL);
2093                 }
2094
2095                 tmp.lb_buf = (char *)comp_v1 + le32_to_cpu(ent->lcme_offset);
2096                 tmp.lb_len = le32_to_cpu(ent->lcme_size);
2097
2098                 /* Check DoM entry is always the first one */
2099                 lum = tmp.lb_buf;
2100                 if (lov_pattern(le32_to_cpu(lum->lmm_pattern)) ==
2101                     LOV_PATTERN_MDT) {
2102                         /* DoM component must be the first in a mirror */
2103                         if (le64_to_cpu(ext->e_start) > 0) {
2104                                 CDEBUG(D_LAYOUT, "invalid DoM component "
2105                                        "with %llu extent start\n",
2106                                        le64_to_cpu(ext->e_start));
2107                                 RETURN(-EINVAL);
2108                         }
2109                         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2110                         /* There is just one stripe on MDT and it must
2111                          * cover whole component size. */
2112                         if (stripe_size != le64_to_cpu(ext->e_end)) {
2113                                 CDEBUG(D_LAYOUT, "invalid DoM layout "
2114                                        "stripe size %u != %llu "
2115                                        "(component size)\n",
2116                                        stripe_size, prev_end);
2117                                 RETURN(-EINVAL);
2118                         }
2119                         /* Check and adjust stripe size by per-MDT limit */
2120                         rc = lod_dom_stripesize_choose(env, d, comp_v1, ent,
2121                                                        stripe_size);
2122                         /* DoM entry was removed, re-check layout from start */
2123                         if (rc == -ERESTART)
2124                                 goto recheck;
2125                         else if (rc)
2126                                 RETURN(rc);
2127
2128                         if (le16_to_cpu(lum->lmm_stripe_count) == 1)
2129                                 lum->lmm_stripe_count = 0;
2130                         /* Any stripe count is forbidden on DoM component */
2131                         if (lum->lmm_stripe_count > 0) {
2132                                 CDEBUG(D_LAYOUT,
2133                                        "invalid DoM layout stripe count %u, must be 0\n",
2134                                        le16_to_cpu(lum->lmm_stripe_count));
2135                                 RETURN(-EINVAL);
2136                         }
2137
2138                         /* Any pool is forbidden on DoM component */
2139                         if (lum->lmm_magic == LOV_USER_MAGIC_V3) {
2140                                 struct lov_user_md_v3 *v3 = (void *)lum;
2141
2142                                 if (v3->lmm_pool_name[0] != '\0') {
2143                                         CDEBUG(D_LAYOUT,
2144                                                "DoM component cannot have pool assigned\n");
2145                                         RETURN(-EINVAL);
2146                                 }
2147                         }
2148                 }
2149
2150                 prev_end = le64_to_cpu(ext->e_end);
2151
2152                 rc = lod_verify_v1v3(d, &tmp, is_from_disk);
2153                 if (rc)
2154                         RETURN(rc);
2155
2156                 if (prev_end == LUSTRE_EOF || ext->e_start == prev_end)
2157                         continue;
2158
2159                 /* extent end must be aligned with the stripe_size */
2160                 stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2161                 if (stripe_size && prev_end % stripe_size) {
2162                         CDEBUG(D_LAYOUT, "stripe size isn't aligned, "
2163                                "stripe_sz: %u, [%llu, %llu)\n",
2164                                stripe_size, ext->e_start, prev_end);
2165                         RETURN(-EINVAL);
2166                 }
2167         }
2168
2169         /* make sure that the mirror_count is telling the truth */
2170         if (mirror_count != le16_to_cpu(comp_v1->lcm_mirror_count) + 1)
2171                 RETURN(-EINVAL);
2172
2173         RETURN(0);
2174 }
2175
2176 /**
2177  * set the default stripe size, if unset.
2178  *
2179  * \param[in,out] val   number of bytes per OST stripe
2180  *
2181  * The minimum stripe size is 64KB to ensure that a single stripe is an
2182  * even multiple of a client PAGE_SIZE (IA64, PPC, etc).  Otherwise, it
2183  * is difficult to split dirty pages across OSCs during writes.
2184  */
2185 void lod_fix_desc_stripe_size(__u64 *val)
2186 {
2187         if (*val < LOV_MIN_STRIPE_SIZE) {
2188                 if (*val != 0)
2189                         LCONSOLE_INFO("Increasing default stripe size to "
2190                                       "minimum value %u\n",
2191                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
2192                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
2193         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
2194                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
2195                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
2196                               "multiple of %u)\n",
2197                               *val, LOV_MIN_STRIPE_SIZE);
2198         }
2199 }
2200
2201 /**
2202  * set the filesystem default number of stripes, if unset.
2203  *
2204  * \param[in,out] val   number of stripes
2205  *
2206  * A value of "0" means "use the system-wide default stripe count", which
2207  * has either been inherited by now, or falls back to 1 stripe per file.
2208  * A value of "-1" (0xffffffff) means "stripe over all available OSTs",
2209  * and is a valid value, so is left unchanged here.
2210  */
2211 void lod_fix_desc_stripe_count(__u32 *val)
2212 {
2213         if (*val == 0)
2214                 *val = 1;
2215 }
2216
2217 /**
2218  * set the filesystem default layout pattern
2219  *
2220  * \param[in,out] val   LOV_PATTERN_* layout
2221  *
2222  * A value of "0" means "use the system-wide default layout type", which
2223  * has either been inherited by now, or falls back to plain RAID0 striping.
2224  */
2225 void lod_fix_desc_pattern(__u32 *val)
2226 {
2227         /* from lov_setstripe */
2228         if ((*val != 0) && !lov_pattern_supported_normal_comp(*val)) {
2229                 LCONSOLE_WARN("lod: Unknown stripe pattern: %#x\n", *val);
2230                 *val = 0;
2231         }
2232 }
2233
2234 void lod_fix_lmv_desc_pattern(__u32 *val)
2235 {
2236         if ((*val) && !lmv_is_known_hash_type(*val)) {
2237                 LCONSOLE_WARN("lod: Unknown md stripe pattern: %#x\n", *val);
2238                 *val = 0;
2239         }
2240 }
2241
2242 void lod_fix_desc_qos_maxage(__u32 *val)
2243 {
2244         /* fix qos_maxage */
2245         if (*val == 0)
2246                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
2247 }
2248
2249 /**
2250  * Used to fix insane default striping.
2251  *
2252  * \param[in] desc      striping description
2253  */
2254 void lod_fix_desc(struct lov_desc *desc)
2255 {
2256         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
2257         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2258         lod_fix_desc_pattern(&desc->ld_pattern);
2259         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2260 }
2261
2262 static void lod_fix_lmv_desc(struct lmv_desc *desc)
2263 {
2264         desc->ld_active_tgt_count = 0;
2265         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2266         lod_fix_lmv_desc_pattern(&desc->ld_pattern);
2267         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2268 }
2269
2270 /**
2271  * Initialize the structures used to store pools and default striping.
2272  *
2273  * \param[in] lod       LOD device
2274  * \param[in] lcfg      configuration structure storing default striping.
2275  *
2276  * \retval              0 if initialization succeeds
2277  * \retval              negative error number on failure
2278  */
2279 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
2280 {
2281         struct obd_device          *obd;
2282         struct lov_desc            *desc;
2283         int                         rc;
2284         ENTRY;
2285
2286         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
2287         LASSERT(obd != NULL);
2288         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
2289
2290         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
2291                 CERROR("LOD setup requires a descriptor\n");
2292                 RETURN(-EINVAL);
2293         }
2294
2295         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
2296
2297         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
2298                 CERROR("descriptor size wrong: %d > %d\n",
2299                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
2300                 RETURN(-EINVAL);
2301         }
2302
2303         if (desc->ld_magic != LOV_DESC_MAGIC) {
2304                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
2305                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
2306                                obd->obd_name, desc);
2307                         lustre_swab_lov_desc(desc);
2308                 } else {
2309                         CERROR("%s: Bad lov desc magic: %#x\n",
2310                                obd->obd_name, desc->ld_magic);
2311                         RETURN(-EINVAL);
2312                 }
2313         }
2314
2315         lod_fix_desc(desc);
2316
2317         desc->ld_active_tgt_count = 0;
2318         lod->lod_ost_descs.ltd_lov_desc = *desc;
2319
2320         /* NB: config doesn't contain lmv_desc, alter it via sysfs. */
2321         lod_fix_lmv_desc(&lod->lod_mdt_descs.ltd_lmv_desc);
2322
2323         lod->lod_sp_me = LUSTRE_SP_CLI;
2324
2325         /* Set up OST pool environment */
2326         lod->lod_pool_count = 0;
2327         rc = lod_pool_hash_init(&lod->lod_pools_hash_body);
2328         if (rc)
2329                 RETURN(-ENOMEM);
2330
2331         INIT_LIST_HEAD(&lod->lod_pool_list);
2332         lod->lod_pool_count = 0;
2333         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_tgt_pool, 0);
2334         if (rc)
2335                 GOTO(out_hash, rc);
2336
2337         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool, 0);
2338         if (rc)
2339                 GOTO(out_mdt_pool, rc);
2340
2341         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_tgt_pool, 0);
2342         if (rc)
2343                 GOTO(out_mdt_rr_pool, rc);
2344
2345         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool, 0);
2346         if (rc)
2347                 GOTO(out_ost_pool, rc);
2348
2349         RETURN(0);
2350
2351 out_ost_pool:
2352         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2353 out_mdt_rr_pool:
2354         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2355 out_mdt_pool:
2356         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2357 out_hash:
2358         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2359
2360         return rc;
2361 }
2362
2363 /**
2364  * Release the structures describing the pools.
2365  *
2366  * \param[in] lod       LOD device from which we release the structures
2367  *
2368  * \retval              0 always
2369  */
2370 int lod_pools_fini(struct lod_device *lod)
2371 {
2372         struct obd_device   *obd = lod2obd(lod);
2373         struct pool_desc    *pool, *tmp;
2374         ENTRY;
2375
2376         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
2377                 /* free pool structs */
2378                 CDEBUG(D_INFO, "delete pool %p\n", pool);
2379                 /* In the function below, .hs_keycmp resolves to
2380                  * pool_hashkey_keycmp() */
2381                 /* coverity[overrun-buffer-val] */
2382                 lod_pool_del(obd, pool->pool_name);
2383         }
2384
2385         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2386         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool);
2387         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2388         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2389         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2390
2391         RETURN(0);
2392 }