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                                   OBD_CONNECT_FLAGS2;
 180         data->ocd_version = LUSTRE_VERSION_CODE;
 181         data->ocd_index = index;
 182
 183         if (strcmp(LUSTRE_OSC_NAME, type) == 0) {
 184                 for_ost = true;
 185                 data->ocd_connect_flags |= OBD_CONNECT_AT |
 186                                            OBD_CONNECT_FULL20 |
 187                                            OBD_CONNECT_INDEX |
 188 #ifdef HAVE_LRU_RESIZE_SUPPORT
 189                                            OBD_CONNECT_LRU_RESIZE |
 190 #endif
 191                                            OBD_CONNECT_MDS |
 192                                            OBD_CONNECT_REQPORTAL |
 193                                            OBD_CONNECT_SKIP_ORPHAN |
 194                                            OBD_CONNECT_FID |
 195                                            OBD_CONNECT_LVB_TYPE |
 196                                            OBD_CONNECT_VERSION |
 197                                            OBD_CONNECT_PINGLESS |
 198                                            OBD_CONNECT_LFSCK |
 199                                            OBD_CONNECT_BULK_MBITS;
 200                 data->ocd_connect_flags2 = OBD_CONNECT2_REPLAY_CREATE;
 201
 202                 data->ocd_group = tgt_index;
 203                 ltd = &lod->lod_ost_descs;
 204         } else {
 205                 struct obd_import *imp = obd->u.cli.cl_import;
 206
 207                 for_ost = false;
 208                 data->ocd_ibits_known = MDS_INODELOCK_UPDATE;
 209                 data->ocd_connect_flags |= OBD_CONNECT_ACL |
 210                                            OBD_CONNECT_IBITS |
 211                                            OBD_CONNECT_MDS_MDS |
 212                                            OBD_CONNECT_MULTIMODRPCS |
 213                                            OBD_CONNECT_FID |
 214                                            OBD_CONNECT_AT |
 215                                            OBD_CONNECT_FULL20 |
 216                                            OBD_CONNECT_LFSCK |
 217                                            OBD_CONNECT_BULK_MBITS;
 218                 spin_lock(&imp->imp_lock);
 219                 imp->imp_server_timeout = 1;
 220                 spin_unlock(&imp->imp_lock);
 221                 imp->imp_client->cli_request_portal = OUT_PORTAL;
 222                 CDEBUG(D_OTHER, "%s: Set 'mds' portal and timeout\n",
 223                       obd->obd_name);
 224                 ltd = &lod->lod_mdt_descs;
 225         }
 226
 227         rc = obd_connect(env, &exp, obd, &obd->obd_uuid, data, NULL);
 228         OBD_FREE_PTR(data);
 229         if (rc) {
 230                 CERROR("%s: cannot connect to next dev %s (%d)\n",
 231                        obd->obd_name, osp, rc);
 232                 GOTO(out_cleanup, rc);
 233         }
 234         connected = true;
 235
 236         /* Allocate ost descriptor and fill it */
 237         OBD_ALLOC_PTR(tgt_desc);
 238         if (!tgt_desc)
 239                 GOTO(out_cleanup, rc = -ENOMEM);
 240
 241         tgt_desc->ltd_tgt    = dt_dev;
 242         tgt_desc->ltd_exp    = exp;
 243         tgt_desc->ltd_uuid   = obd->u.cli.cl_target_uuid;
 244         tgt_desc->ltd_gen    = gen;
 245         tgt_desc->ltd_index  = index;
 246         tgt_desc->ltd_active = active;
 247
 248         down_write(&ltd->ltd_rw_sem);
 249         mutex_lock(&ltd->ltd_mutex);
 250         rc = ltd_add_tgt(ltd, tgt_desc);
 251         if (rc)
 252                 GOTO(out_mutex, rc);
 253
 254         rc = lu_qos_add_tgt(&ltd->ltd_qos, tgt_desc);
 255         if (rc)
 256                 GOTO(out_del_tgt, rc);
 257
 258         rc = lu_tgt_pool_add(&ltd->ltd_tgt_pool, index,
 259                           ltd->ltd_lov_desc.ld_tgt_count);
 260         if (rc) {
 261                 CERROR("%s: can't set up pool, failed with %d\n",
 262                        obd->obd_name, rc);
 263                 GOTO(out_del_tgt, rc);
 264         }
 265
 266         mutex_unlock(&ltd->ltd_mutex);
 267         up_write(&ltd->ltd_rw_sem);
 268
 269         if (lod->lod_recovery_completed)
 270                 lu_dev->ld_ops->ldo_recovery_complete(env, lu_dev);
 271
 272         if (!for_ost && lod->lod_initialized) {
 273                 rc = lod_sub_init_llog(env, lod, tgt_desc->ltd_tgt);
 274                 if (rc != 0) {
 275                         CERROR("%s: cannot start llog on %s:rc = %d\n",
 276                                lod2obd(lod)->obd_name, osp, rc);
 277                         GOTO(out_ltd, rc);
 278                 }
 279         }
 280
 281         rc = lfsck_add_target(env, lod->lod_child, dt_dev, exp, index, for_ost);
 282         if (rc != 0) {
 283                 CERROR("Fail to add LFSCK target: name = %s, type = %s, "
 284                        "index = %u, rc = %d\n", osp, type, index, rc);
 285                 GOTO(out_fini_llog, rc);
 286         }
 287         RETURN(rc);
 288 out_fini_llog:
 289         lod_sub_fini_llog(env, tgt_desc->ltd_tgt,
 290                           &tgt_desc->ltd_recovery_task);
 291 out_ltd:
 292         down_write(&ltd->ltd_rw_sem);
 293         mutex_lock(&ltd->ltd_mutex);
 294         lu_tgt_pool_remove(&ltd->ltd_tgt_pool, index);
 295 out_del_tgt:
 296         ltd_del_tgt(ltd, tgt_desc);
 297 out_mutex:
 298         mutex_unlock(&ltd->ltd_mutex);
 299         up_write(&ltd->ltd_rw_sem);
 300         OBD_FREE_PTR(tgt_desc);
 301 out_cleanup:
 302         /* XXX OSP needs us to send down LCFG_CLEANUP because it uses
 303          * objects from the MDT stack. See LU-7184. */
 304         lcfg = &lod_env_info(env)->lti_lustre_cfg;
 305         memset(lcfg, 0, sizeof(*lcfg));
 306         lcfg->lcfg_version = LUSTRE_CFG_VERSION;
 307         lcfg->lcfg_command = LCFG_CLEANUP;
 308         lu_dev->ld_ops->ldo_process_config(env, lu_dev, lcfg);
 309
 310         if (connected)
 311                 obd_disconnect(exp);
 312
 313         return rc;
 314 }
 315
 316 /**
 317  * Schedule target removal from the target table.
 318  *
 319  * Mark the device as dead. The device is not removed here because it may
 320  * still be in use. The device will be removed in lod_putref() when the
 321  * last reference is released.
 322  *
 323  * \param[in] env               execution environment for this thread
 324  * \param[in] lod               LOD device the target table belongs to
 325  * \param[in] ltd               target table
 326  * \param[in] tgt               target
 327  */
 328 static void __lod_del_device(const struct lu_env *env, struct lod_device *lod,
 329                              struct lod_tgt_descs *ltd, struct lu_tgt_desc *tgt)
 330 {
 331         lfsck_del_target(env, lod->lod_child, tgt->ltd_tgt, tgt->ltd_index,
 332                          !ltd->ltd_is_mdt);
 333
 334         if (!tgt->ltd_reap) {
 335                 tgt->ltd_reap = 1;
 336                 ltd->ltd_death_row++;
 337         }
 338 }
 339
 340 /**
 341  * Schedule removal of all the targets from the given target table.
 342  *
 343  * See more details in the description for __lod_del_device()
 344  *
 345  * \param[in] env               execution environment for this thread
 346  * \param[in] lod               LOD device the target table belongs to
 347  * \param[in] ltd               target table
 348  *
 349  * \retval                      0 always
 350  */
 351 int lod_fini_tgt(const struct lu_env *env, struct lod_device *lod,
 352                  struct lod_tgt_descs *ltd)
 353 {
 354         struct lu_tgt_desc *tgt;
 355
 356         if (ltd->ltd_tgts_size <= 0)
 357                 return 0;
 358
 359         lod_getref(ltd);
 360         mutex_lock(&ltd->ltd_mutex);
 361         ltd_foreach_tgt(ltd, tgt)
 362                 __lod_del_device(env, lod, ltd, tgt);
 363         mutex_unlock(&ltd->ltd_mutex);
 364         lod_putref(lod, ltd);
 365
 366         lu_tgt_descs_fini(ltd);
 367
 368         return 0;
 369 }
 370
 371 /**
 372  * Remove device by name.
 373  *
 374  * Remove a device identified by \a osp from the target table. Given
 375  * the device can be in use, the real deletion happens in lod_putref().
 376  *
 377  * \param[in] env               execution environment for this thread
 378  * \param[in] lod               LOD device to be connected to the new OSP
 379  * \param[in] ltd               target table
 380  * \param[in] osp               name of OSP device to be removed
 381  * \param[in] idx               index of the target
 382  * \param[in] gen               generation number, not used currently
 383  *
 384  * \retval                      0 if the device was scheduled for removal
 385  * \retval                      -EINVAL if no device was found
 386  */
 387 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
 388                    struct lod_tgt_descs *ltd, char *osp, unsigned int idx,
 389                    unsigned int gen)
 390 {
 391         struct obd_device *obd;
 392         struct lu_tgt_desc *tgt;
 393         struct obd_uuid uuid;
 394         int rc = 0;
 395
 396         ENTRY;
 397
 398         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
 399
 400         obd_str2uuid(&uuid, osp);
 401
 402         obd = class_find_client_obd(&uuid, LUSTRE_OSP_NAME,
 403                                    &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 404         if (obd == NULL) {
 405                 CERROR("can't find %s device\n", osp);
 406                 RETURN(-EINVAL);
 407         }
 408
 409         if (gen <= 0) {
 410                 CERROR("%s: request to remove OBD %s with invalid generation %d"
 411                        "\n", obd->obd_name, osp, gen);
 412                 RETURN(-EINVAL);
 413         }
 414
 415         obd_str2uuid(&uuid,  osp);
 416
 417         lod_getref(ltd);
 418         mutex_lock(&ltd->ltd_mutex);
 419         tgt = LTD_TGT(ltd, idx);
 420         /* check that the index is allocated in the bitmap */
 421         if (!test_bit(idx, ltd->ltd_tgt_bitmap) || !tgt) {
 422                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
 423                 GOTO(out, rc = -EINVAL);
 424         }
 425
 426         /* check that the UUID matches */
 427         if (!obd_uuid_equals(&uuid, &tgt->ltd_uuid)) {
 428                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
 429                        obd->obd_name, obd_uuid2str(&tgt->ltd_uuid), idx, osp);
 430                 GOTO(out, rc = -EINVAL);
 431         }
 432
 433         __lod_del_device(env, lod, ltd, tgt);
 434         EXIT;
 435 out:
 436         mutex_unlock(&ltd->ltd_mutex);
 437         lod_putref(lod, ltd);
 438         return(rc);
 439 }
 440
 441 /**
 442  * Resize per-thread storage to hold specified size.
 443  *
 444  * A helper function to resize per-thread temporary storage. This storage
 445  * is used to process LOV/LVM EAs and may be quite large. We do not want to
 446  * allocate/release it every time, so instead we put it into the env and
 447  * reallocate on demand. The memory is released when the correspondent thread
 448  * is finished.
 449  *
 450  * \param[in] info              LOD-specific storage in the environment
 451  * \param[in] size              new size to grow the buffer to
 452
 453  * \retval                      0 on success, -ENOMEM if reallocation failed
 454  */
 455 int lod_ea_store_resize(struct lod_thread_info *info, size_t size)
 456 {
 457         __u32 round = size_roundup_power2(size);
 458
 459         if (info->lti_ea_store) {
 460                 LASSERT(info->lti_ea_store_size);
 461                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
 462                        info->lti_ea_store_size, round);
 463                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
 464                 info->lti_ea_store = NULL;
 465                 info->lti_ea_store_size = 0;
 466         }
 467
 468         OBD_ALLOC_LARGE(info->lti_ea_store, round);
 469         if (info->lti_ea_store == NULL)
 470                 RETURN(-ENOMEM);
 471         info->lti_ea_store_size = round;
 472
 473         RETURN(0);
 474 }
 475
 476 static void lod_free_comp_buffer(struct lod_layout_component *entries,
 477                                  __u16 count, __u32 bufsize)
 478 {
 479         struct lod_layout_component *entry;
 480         int i;
 481
 482         for (i = 0; i < count; i++) {
 483                 entry = &entries[i];
 484                 if (entry->llc_magic == LOV_MAGIC_FOREIGN)
 485                         continue;
 486                 if (entry->llc_pool != NULL)
 487                         lod_set_pool(&entry->llc_pool, NULL);
 488                 if (entry->llc_ostlist.op_array) {
 489                         OBD_FREE(entry->llc_ostlist.op_array,
 490                                  entry->llc_ostlist.op_size);
 491                         entry->llc_ostlist.op_array = NULL;
 492                         entry->llc_ostlist.op_size = 0;
 493                 }
 494                 LASSERT(entry->llc_stripe == NULL);
 495                 LASSERT(entry->llc_stripes_allocated == 0);
 496         }
 497
 498         if (bufsize != 0)
 499                 OBD_FREE_LARGE(entries, bufsize);
 500 }
 501
 502 void lod_free_def_comp_entries(struct lod_default_striping *lds)
 503 {
 504         lod_free_comp_buffer(lds->lds_def_comp_entries,
 505                              lds->lds_def_comp_size_cnt,
 506                              size_roundup_power2(
 507                                      sizeof(*lds->lds_def_comp_entries) *
 508                                      lds->lds_def_comp_size_cnt));
 509         lds->lds_def_comp_entries = NULL;
 510         lds->lds_def_comp_cnt = 0;
 511         lds->lds_def_striping_is_composite = 0;
 512         lds->lds_def_comp_size_cnt = 0;
 513 }
 514
 515 /**
 516  * Resize per-thread storage to hold default striping component entries
 517  *
 518  * A helper function to resize per-thread temporary storage. This storage
 519  * is used to hold default LOV/LVM EAs and may be quite large. We do not want
 520  * to allocate/release it every time, so instead we put it into the env and
 521  * reallocate it on demand. The memory is released when the correspondent
 522  * thread is finished.
 523  *
 524  * \param[in,out] lds           default striping
 525  * \param[in] count             new component count to grow the buffer to
 526
 527  * \retval                      0 on success, -ENOMEM if reallocation failed
 528  */
 529 int lod_def_striping_comp_resize(struct lod_default_striping *lds, __u16 count)
 530 {
 531         struct lod_layout_component *entries;
 532         __u32 new = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
 533                                         count);
 534         __u32 old = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
 535                                         lds->lds_def_comp_size_cnt);
 536
 537         if (new <= old)
 538                 return 0;
 539
 540         OBD_ALLOC_LARGE(entries, new);
 541         if (entries == NULL)
 542                 return -ENOMEM;
 543
 544         if (lds->lds_def_comp_entries != NULL) {
 545                 CDEBUG(D_INFO, "default striping component size %d is not "
 546                        "enough, need %d\n", old, new);
 547                 lod_free_def_comp_entries(lds);
 548         }
 549
 550         lds->lds_def_comp_entries = entries;
 551         lds->lds_def_comp_size_cnt = count;
 552
 553         RETURN(0);
 554 }
 555
 556 void lod_free_comp_entries(struct lod_object *lo)
 557 {
 558         if (lo->ldo_mirrors) {
 559                 OBD_FREE_PTR_ARRAY(lo->ldo_mirrors, lo->ldo_mirror_count);
 560                 lo->ldo_mirrors = NULL;
 561                 lo->ldo_mirror_count = 0;
 562         }
 563         lod_free_comp_buffer(lo->ldo_comp_entries,
 564                              lo->ldo_comp_cnt,
 565                              sizeof(*lo->ldo_comp_entries) * lo->ldo_comp_cnt);
 566         lo->ldo_comp_entries = NULL;
 567         lo->ldo_comp_cnt = 0;
 568         lo->ldo_is_composite = 0;
 569 }
 570
 571 int lod_alloc_comp_entries(struct lod_object *lo,
 572                            int mirror_count, int comp_count)
 573 {
 574         LASSERT(comp_count != 0);
 575         LASSERT(lo->ldo_comp_cnt == 0 && lo->ldo_comp_entries == NULL);
 576
 577         if (mirror_count > 0) {
 578                 OBD_ALLOC_PTR_ARRAY(lo->ldo_mirrors, mirror_count);
 579                 if (!lo->ldo_mirrors)
 580                         return -ENOMEM;
 581
 582                 lo->ldo_mirror_count = mirror_count;
 583         }
 584
 585         OBD_ALLOC_LARGE(lo->ldo_comp_entries,
 586                         sizeof(*lo->ldo_comp_entries) * comp_count);
 587         if (lo->ldo_comp_entries == NULL) {
 588                 OBD_FREE_PTR_ARRAY(lo->ldo_mirrors, mirror_count);
 589                 lo->ldo_mirrors = NULL;
 590                 lo->ldo_mirror_count = 0;
 591                 return -ENOMEM;
 592         }
 593
 594         lo->ldo_comp_cnt = comp_count;
 595         lo->ldo_is_foreign = 0;
 596         return 0;
 597 }
 598
 599 int lod_fill_mirrors(struct lod_object *lo)
 600 {
 601         struct lod_device *lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 602         struct lod_layout_component *lod_comp;
 603         bool found_preferred = false;
 604         int mirror_idx = -1;
 605         __u16 mirror_id = 0xffff;
 606         int i, pref;
 607         ENTRY;
 608
 609         LASSERT(equi(!lo->ldo_is_composite, lo->ldo_mirror_count == 0));
 610
 611         if (!lo->ldo_is_composite)
 612                 RETURN(0);
 613
 614         lod_comp = &lo->ldo_comp_entries[0];
 615
 616         for (i = 0; i < lo->ldo_comp_cnt; i++, lod_comp++) {
 617                 bool stale = lod_comp->llc_flags & LCME_FL_STALE;
 618                 bool preferred = lod_comp->llc_flags & LCME_FL_PREF_WR;
 619                 bool mirror_hsm = lod_is_hsm(lod_comp);
 620                 bool init = (lod_comp->llc_stripe != NULL) &&
 621                             !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
 622                             !(lod_comp->llc_pattern & LOV_PATTERN_MDT);
 623                 int j;
 624
 625                 pref = 0;
 626                 /* calculate component preference over all used OSTs */
 627                 for (j = 0; init && j < lod_comp->llc_stripes_allocated; j++) {
 628                         __u32 idx = lod_comp->llc_ost_indices[j];
 629                         struct lod_tgt_desc *ltd;
 630
 631                         if (lod_comp->llc_stripe[j] == NULL)
 632                                 continue;
 633
 634                         if (unlikely(idx >= lod->lod_ost_descs.ltd_tgts_size)) {
 635                                 CERROR("%s: "DFID" OST idx %u > max %u\n",
 636                                        lod2obd(lod)->obd_name,
 637                                        PFID(lu_object_fid(&lo->ldo_obj.do_lu)),
 638                                        idx, lod->lod_ost_descs.ltd_tgts_size);
 639                                 continue;
 640                         }
 641                         ltd = OST_TGT(lod, idx);
 642                         if (unlikely(!ltd)) {
 643                                 CERROR("%s: "DFID" OST idx %u is NULL\n",
 644                                        lod2obd(lod)->obd_name,
 645                                        PFID(lu_object_fid(&lo->ldo_obj.do_lu)),
 646                                        idx);
 647                                 continue;
 648                         }
 649
 650                         if (ltd->ltd_statfs.os_state & OS_STATFS_NONROT)
 651                                 pref++;
 652                 }
 653
 654                 if (mirror_id_of(lod_comp->llc_id) == mirror_id) {
 655                         /* Currently HSM mirror does not support PFL. */
 656                         if (lo->ldo_mirrors[mirror_idx].lme_hsm)
 657                                 RETURN(-EINVAL);
 658                         lo->ldo_mirrors[mirror_idx].lme_stale |= stale;
 659                         lo->ldo_mirrors[mirror_idx].lme_prefer |= preferred;
 660                         lo->ldo_mirrors[mirror_idx].lme_preference += pref;
 661                         lo->ldo_mirrors[mirror_idx].lme_end = i;
 662                         continue;
 663                 }
 664
 665                 if (mirror_idx >= 0 && preferred &&
 666                     !lo->ldo_mirrors[mirror_idx].lme_stale)
 667                         found_preferred = true;
 668
 669                 /* new mirror */
 670                 ++mirror_idx;
 671                 if (mirror_idx >= lo->ldo_mirror_count)
 672                         RETURN(-EINVAL);
 673
 674                 if (mirror_hsm && (lod_comp->llc_extent.e_start != 0 ||
 675                                    lod_comp->llc_extent.e_end != LUSTRE_EOF))
 676                         RETURN(-EINVAL);
 677
 678                 mirror_id = mirror_id_of(lod_comp->llc_id);
 679
 680                 lo->ldo_mirrors[mirror_idx].lme_id = mirror_id;
 681                 lo->ldo_mirrors[mirror_idx].lme_stale = stale;
 682                 lo->ldo_mirrors[mirror_idx].lme_prefer = preferred;
 683                 lo->ldo_mirrors[mirror_idx].lme_hsm = mirror_hsm;
 684                 lo->ldo_mirrors[mirror_idx].lme_preference = pref;
 685                 lo->ldo_mirrors[mirror_idx].lme_start = i;
 686                 lo->ldo_mirrors[mirror_idx].lme_end = i;
 687         }
 688         if (mirror_idx != lo->ldo_mirror_count - 1)
 689                 RETURN(-EINVAL);
 690
 691         if (!found_preferred && mirror_idx > 0) {
 692                 int best = -1;
 693
 694                 /*
 695                  * if no explicited preferred found, then find a mirror
 696                  * with higher number of non-rotational OSTs
 697                  * */
 698                 pref = -1;
 699                 for (i = 0; i <= mirror_idx; i++) {
 700                         if (lo->ldo_mirrors[i].lme_stale)
 701                                 continue;
 702                         if (lo->ldo_mirrors[i].lme_preference > pref) {
 703                                 pref = lo->ldo_mirrors[i].lme_preference;
 704                                 best = i;
 705                         }
 706                 }
 707
 708                 LASSERT(best >= 0);
 709                 lo->ldo_mirrors[best].lme_prefer = 1;
 710         }
 711
 712         RETURN(0);
 713 }
 714
 715 /**
 716  * Generate on-disk lov_mds_md structure for each layout component based on
 717  * the information in lod_object->ldo_comp_entries[i].
 718  *
 719  * \param[in] env               execution environment for this thread
 720  * \param[in] lo                LOD object
 721  * \param[in] comp_idx          index of ldo_comp_entries
 722  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 723  * \param[in|out] lmm_size      buffer size/lmm size
 724  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 725  *                              the stripe info is from the default stripe
 726  *                              template, which is collected in lod_ah_init(),
 727  *                              either from parent object or root object; for
 728  *                              file case, it's from the @lo object
 729  *
 730  * \retval                      0 if on disk structure is created successfully
 731  * \retval                      negative error number on failure
 732  */
 733 static int lod_gen_component_ea(const struct lu_env *env,
 734                                 struct lod_object *lo, int comp_idx,
 735                                 struct lov_mds_md *lmm, int *lmm_size,
 736                                 bool is_dir)
 737 {
 738         struct lod_thread_info  *info = lod_env_info(env);
 739         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
 740         struct lod_device       *lod;
 741         struct lov_ost_data_v1  *objs;
 742         struct lod_layout_component *lod_comp;
 743         __u32   magic;
 744         __u16 stripe_count;
 745         int     i, rc = 0;
 746         ENTRY;
 747
 748         LASSERT(lo);
 749         if (is_dir)
 750                 lod_comp =
 751                         &lo->ldo_def_striping->lds_def_comp_entries[comp_idx];
 752         else
 753                 lod_comp = &lo->ldo_comp_entries[comp_idx];
 754
 755         magic = lod_comp->llc_pool != NULL ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
 756         if (is_dir && lod_comp->llc_ostlist.op_count)
 757                 magic = LOV_MAGIC_SPECIFIC;
 758
 759         if (lod_comp->llc_pattern == 0) /* default striping */
 760                 lod_comp->llc_pattern = LOV_PATTERN_RAID0;
 761
 762         lmm->lmm_magic = cpu_to_le32(magic);
 763         lmm->lmm_pattern = cpu_to_le32(lod_comp->llc_pattern);
 764         fid_to_lmm_oi(fid, &lmm->lmm_oi);
 765         if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
 766                 lmm->lmm_oi.oi.oi_id++;
 767         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
 768
 769         lmm->lmm_stripe_size = cpu_to_le32(lod_comp->llc_stripe_size);
 770         lmm->lmm_stripe_count = cpu_to_le16(lod_comp->llc_stripe_count);
 771         /**
 772          * for dir and uninstantiated component, lmm_layout_gen stores
 773          * default stripe offset.
 774          */
 775         lmm->lmm_layout_gen =
 776                 (is_dir || !lod_comp_inited(lod_comp)) ?
 777                         cpu_to_le16(lod_comp->llc_stripe_offset) :
 778                         cpu_to_le16(lod_comp->llc_layout_gen);
 779
 780         if (magic == LOV_MAGIC_V1) {
 781                 objs = &lmm->lmm_objects[0];
 782         } else {
 783                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
 784                 ssize_t cplen = strscpy(v3->lmm_pool_name,
 785                                        lod_comp->llc_pool ? : "\0",
 786                                        sizeof(v3->lmm_pool_name));
 787
 788                 if (cplen < 0)
 789                         RETURN(cplen);
 790                 objs = &v3->lmm_objects[0];
 791         }
 792         lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 793         stripe_count = lod_comp_entry_stripe_count(lo, comp_idx, is_dir);
 794         if (stripe_count == 0 && !is_dir &&
 795             !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
 796             !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
 797                 /* Try again if all active targets are disconnected.
 798                  * It is possible when MDS does failover. */
 799                 if (!lod->lod_ost_active_count &&
 800                     lod->lod_ost_count)
 801                         RETURN(-EAGAIN);
 802                 RETURN(-E2BIG);
 803         }
 804
 805         if (!is_dir && lo->ldo_is_composite)
 806                 lod_comp_shrink_stripe_count(lod_comp, &stripe_count);
 807
 808         if ((is_dir && magic != LOV_MAGIC_SPECIFIC) ||
 809             lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED)
 810                 GOTO(done, rc = 0);
 811
 812         /* generate ost_idx of this component stripe */
 813         for (i = 0; i < stripe_count; i++) {
 814                 struct dt_object *object;
 815                 __u32 ost_idx = (__u32)-1UL;
 816                 int type = LU_SEQ_RANGE_OST;
 817
 818                 if (lod_comp->llc_stripe && lod_comp->llc_stripe[i]) {
 819                         object = lod_comp->llc_stripe[i];
 820                         /* instantiated component */
 821                         info->lti_fid = *lu_object_fid(&object->do_lu);
 822
 823                         if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF) &&
 824                             comp_idx == 0) {
 825                                 if (cfs_fail_val == 0)
 826                                         cfs_fail_val = info->lti_fid.f_oid;
 827                                 else if (i == 0)
 828                                         info->lti_fid.f_oid = cfs_fail_val;
 829                         }
 830
 831                         rc = fid_to_ostid(&info->lti_fid, &info->lti_ostid);
 832                         LASSERT(rc == 0);
 833
 834                         ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 835                         objs[i].l_ost_gen = cpu_to_le32(0);
 836                         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_FLD_LOOKUP))
 837                                 rc = -ENOENT;
 838                         else
 839                                 rc = lod_fld_lookup(env, lod, &info->lti_fid,
 840                                                     &ost_idx, &type);
 841                         if (rc < 0) {
 842                                 CERROR("%s: Can not locate "DFID": rc = %d\n",
 843                                        lod2obd(lod)->obd_name,
 844                                        PFID(&info->lti_fid), rc);
 845                                 RETURN(rc);
 846                         }
 847                 } else if (lod_comp->llc_ostlist.op_array &&
 848                            lod_comp->llc_ostlist.op_count) {
 849                         /* user specified ost list */
 850                         ost_idx = lod_comp->llc_ostlist.op_array[i];
 851                 }
 852                 /*
 853                  * with un-instantiated or with no specified ost list
 854                  * component, its l_ost_idx does not matter.
 855                  */
 856                 objs[i].l_ost_idx = cpu_to_le32(ost_idx);
 857
 858                 /* simulation of broken LOVEA */
 859                 if (CFS_FAIL_CHECK(OBD_FAIL_LOV_INVALID_OSTIDX) &&
 860                     comp_idx == 0 && i == 0 && lo->ldo_mirror_count > 1) {
 861                         objs[i].l_ost_idx = cpu_to_le32(0xffffffff);
 862                 }
 863
 864         }
 865 done:
 866         if (lmm_size != NULL)
 867                 *lmm_size = lov_mds_md_size(stripe_count, magic);
 868         RETURN(rc);
 869 }
 870
 871 /**
 872  * Generate on-disk lov_hsm_md structure based on the information in
 873  * the lod_object->ldo_comp_entries.
 874  */
 875 static int lod_gen_component_ea_foreign(const struct lu_env *env,
 876                                         struct lod_object *lo,
 877                                         struct lod_layout_component *lod_comp,
 878                                         void *lmm, int *lmm_size)
 879 {
 880         struct lov_foreign_md *lfm = (struct lov_foreign_md *)lmm;
 881
 882         ENTRY;
 883
 884         lfm->lfm_magic = cpu_to_le32(LOV_MAGIC_FOREIGN);
 885         lfm->lfm_length = cpu_to_le32(lod_comp->llc_length);
 886         lfm->lfm_type = cpu_to_le32(lod_comp->llc_type);
 887         lfm->lfm_flags = cpu_to_le32(lod_comp->llc_foreign_flags);
 888
 889         if (lov_hsm_type_supported(lod_comp->llc_type)) {
 890                 if (lod_comp->llc_length != sizeof(struct lov_hsm_base))
 891                         return -EINVAL;
 892
 893                 lov_foreign_hsm_to_le(lfm, &lod_comp->llc_hsm);
 894         }
 895
 896         if (lmm_size)
 897                 *lmm_size = lov_foreign_md_size(lod_comp->llc_length);
 898
 899         RETURN(0);
 900 }
 901
 902 /**
 903  * Generate on-disk lov_mds_md structure based on the information in
 904  * the lod_object->ldo_comp_entries.
 905  *
 906  * \param[in] env               execution environment for this thread
 907  * \param[in] lo                LOD object
 908  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 909  * \param[in|out] lmm_size      buffer size/lmm size
 910  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 911  *                              the stripe info is from the default stripe
 912  *                              template, which is collected in lod_ah_init(),
 913  *                              either from parent object or root object; for
 914  *                              file case, it's from the @lo object
 915  *
 916  * \retval                      0 if on disk structure is created successfully
 917  * \retval                      negative error number on failure
 918  */
 919 int lod_generate_lovea(const struct lu_env *env, struct lod_object *lo,
 920                        struct lov_mds_md *lmm, int *lmm_size, bool is_dir)
 921 {
 922         struct lov_comp_md_entry_v1 *lcme;
 923         struct lov_comp_md_v1 *lcm;
 924         struct lod_layout_component *comp_entries;
 925         __u16 comp_cnt, mirror_cnt;
 926         bool is_composite, is_foreign = false;
 927         int i, rc = 0, offset;
 928         ENTRY;
 929
 930         if (is_dir) {
 931                 comp_cnt = lo->ldo_def_striping->lds_def_comp_cnt;
 932                 mirror_cnt = lo->ldo_def_striping->lds_def_mirror_cnt;
 933                 comp_entries = lo->ldo_def_striping->lds_def_comp_entries;
 934                 is_composite =
 935                         lo->ldo_def_striping->lds_def_striping_is_composite;
 936         } else {
 937                 comp_cnt = lo->ldo_comp_cnt;
 938                 mirror_cnt = lo->ldo_mirror_count;
 939                 comp_entries = lo->ldo_comp_entries;
 940                 is_composite = lo->ldo_is_composite;
 941                 is_foreign = lo->ldo_is_foreign;
 942         }
 943
 944         LASSERT(lmm_size != NULL);
 945
 946         if (is_foreign) {
 947                 struct lov_foreign_md *lfm;
 948
 949                 lfm = (struct lov_foreign_md *)lmm;
 950                 memcpy(lfm, lo->ldo_foreign_lov, lo->ldo_foreign_lov_size);
 951                 /* need to store little-endian */
 952                 if (cpu_to_le32(LOV_MAGIC_FOREIGN) != LOV_MAGIC_FOREIGN) {
 953                         __swab32s(&lfm->lfm_magic);
 954                         __swab32s(&lfm->lfm_length);
 955                         __swab32s(&lfm->lfm_type);
 956                         __swab32s(&lfm->lfm_flags);
 957                 }
 958                 *lmm_size = lo->ldo_foreign_lov_size;
 959                 RETURN(0);
 960         }
 961
 962         LASSERT(comp_cnt != 0 && comp_entries != NULL);
 963
 964         if (!is_composite) {
 965                 rc = lod_gen_component_ea(env, lo, 0, lmm, lmm_size, is_dir);
 966                 RETURN(rc);
 967         }
 968
 969         lcm = (struct lov_comp_md_v1 *)lmm;
 970         memset(lcm, 0, sizeof(*lcm));
 971
 972         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_COMP_V1);
 973         lcm->lcm_entry_count = cpu_to_le16(comp_cnt);
 974         lcm->lcm_mirror_count = cpu_to_le16(mirror_cnt - 1);
 975         if (mirror_cnt > 1)
 976                 lcm->lcm_flags = cpu_to_le16(lo->ldo_flr_state);
 977         else
 978                 lcm->lcm_flags = LCM_FL_NONE;
 979
 980         offset = sizeof(*lcm) + sizeof(*lcme) * comp_cnt;
 981         LASSERT(offset % sizeof(__u64) == 0);
 982
 983         for (i = 0; i < comp_cnt; i++) {
 984                 struct lod_layout_component *lod_comp;
 985                 struct lov_mds_md *sub_md;
 986                 int size;
 987
 988                 lod_comp = &comp_entries[i];
 989                 lcme = &lcm->lcm_entries[i];
 990
 991                 LASSERT(ergo(!is_dir, lod_comp->llc_id != LCME_ID_INVAL));
 992                 lcme->lcme_id = cpu_to_le32(lod_comp->llc_id);
 993
 994                 /* component could be un-inistantiated */
 995                 lcme->lcme_flags = cpu_to_le32(lod_comp->llc_flags);
 996                 if (lod_comp->llc_flags & LCME_FL_NOSYNC)
 997                         lcme->lcme_timestamp =
 998                                 cpu_to_le64(lod_comp->llc_timestamp);
 999                 if (lod_comp->llc_flags & LCME_FL_EXTENSION && !is_dir)
1000                         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_SEL);
1001
1002                 lcme->lcme_extent.e_start =
1003                         cpu_to_le64(lod_comp->llc_extent.e_start);
1004                 lcme->lcme_extent.e_end =
1005                         cpu_to_le64(lod_comp->llc_extent.e_end);
1006                 lcme->lcme_offset = cpu_to_le32(offset);
1007
1008                 sub_md = (struct lov_mds_md *)((char *)lcm + offset);
1009                 if (lod_comp->llc_magic == LOV_MAGIC_FOREIGN) {
1010                         if (!lov_hsm_type_supported(lod_comp->llc_type)) {
1011                                 CDEBUG(D_LAYOUT, "Unknown HSM type: %u\n",
1012                                        lod_comp->llc_type);
1013                                 GOTO(out, rc = -EINVAL);
1014                         }
1015                         rc = lod_gen_component_ea_foreign(env, lo, lod_comp,
1016                                                           sub_md, &size);
1017                 } else {
1018                         rc = lod_gen_component_ea(env, lo, i, sub_md,
1019                                                   &size, is_dir);
1020                 }
1021                 if (rc)
1022                         GOTO(out, rc);
1023                 lcme->lcme_size = cpu_to_le32(size);
1024                 offset += size;
1025                 LASSERTF((offset <= *lmm_size) && (offset % sizeof(__u64) == 0),
1026                          "offset:%d lmm_size:%d\n", offset, *lmm_size);
1027         }
1028         lcm->lcm_size = cpu_to_le32(offset);
1029         lcm->lcm_layout_gen = cpu_to_le32(is_dir ? 0 : lo->ldo_layout_gen);
1030
1031         lustre_print_user_md(D_LAYOUT, (struct lov_user_md *)lmm,
1032                              "generate lum");
1033 out:
1034         if (rc == 0)
1035                 *lmm_size = offset;
1036         RETURN(rc);
1037 }
1038
1039 /**
1040  * Get LOV EA.
1041  *
1042  * Fill lti_ea_store buffer in the environment with a value for the given
1043  * EA. The buffer is reallocated if the value doesn't fit.
1044  *
1045  * \param[in,out] env           execution environment for this thread
1046  *                              .lti_ea_store buffer is filled with EA's value
1047  * \param[in] lo                LOD object
1048  * \param[in] name              name of the EA
1049  *
1050  * \retval                      > 0 if EA is fetched successfully
1051  * \retval                      0 if EA is empty
1052  * \retval                      negative error number on failure
1053  */
1054 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
1055                const char *name)
1056 {
1057         struct lod_thread_info  *info = lod_env_info(env);
1058         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
1059         int rc, count = 0;
1060         ENTRY;
1061
1062         LASSERT(info);
1063
1064         if (unlikely(info->lti_ea_store == NULL)) {
1065                 /* just to enter in allocation block below */
1066                 rc = -ERANGE;
1067         } else {
1068 repeat:
1069                 info->lti_buf.lb_buf = info->lti_ea_store;
1070                 info->lti_buf.lb_len = info->lti_ea_store_size;
1071                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
1072         }
1073
1074         /* if object is not striped or inaccessible */
1075         if (rc == -ENODATA || rc == -ENOENT)
1076                 RETURN(0);
1077
1078         if (rc == -ERANGE) {
1079                 /* EA doesn't fit, reallocate new buffer */
1080                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
1081                 if (rc == -ENODATA || rc == -ENOENT)
1082                         RETURN(0);
1083                 else if (rc < 0)
1084                         RETURN(rc);
1085
1086                 LASSERT(rc > 0);
1087                 if (rc <= info->lti_ea_store_size) {
1088                         /* sometimes LOVEA can shrink in parallel */
1089                         LASSERT(count++ < 10);
1090                         goto repeat;
1091                 }
1092                 rc = lod_ea_store_resize(info, rc);
1093                 if (rc)
1094                         RETURN(rc);
1095                 goto repeat;
1096         }
1097
1098         RETURN(rc);
1099 }
1100
1101 /**
1102  * Verify the target index is present in the current configuration.
1103  *
1104  * \param[in] md                LOD device where the target table is stored
1105  * \param[in] idx               target's index
1106  *
1107  * \retval                      0 if the index is present
1108  * \retval                      -EINVAL if not
1109  */
1110 int validate_lod_and_idx(struct lod_device *md, __u32 idx)
1111 {
1112         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
1113                      !test_bit(idx, md->lod_ost_bitmap))) {
1114                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
1115                        md->lod_ost_descs.ltd_tgts_size);
1116                 return -EINVAL;
1117         }
1118
1119         if (unlikely(OST_TGT(md, idx) == NULL)) {
1120                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
1121                        lod2obd(md)->obd_name, idx);
1122                 return -EINVAL;
1123         }
1124
1125         if (unlikely(OST_TGT(md, idx)->ltd_tgt == NULL)) {
1126                 CERROR("%s: invalid lod device, for idx: %d\n",
1127                        lod2obd(md)->obd_name , idx);
1128                 return -EINVAL;
1129         }
1130
1131         return 0;
1132 }
1133
1134 /**
1135  * Instantiate objects for stripes.
1136  *
1137  * Allocate and initialize LU-objects representing the stripes. The number
1138  * of the stripes (llc_stripe_count) must be initialized already. The caller
1139  * must ensure nobody else is calling the function on the object at the same
1140  * time. FLDB service must be running to be able to map a FID to the targets
1141  * and find appropriate device representing that target.
1142  *
1143  * \param[in] env               execution environment for this thread
1144  * \param[in,out] lo            LOD object
1145  * \param[in] objs              an array of IDs to creates the objects from
1146  * \param[in] comp_idx          index of ldo_comp_entries
1147  *
1148  * \retval                      0 if the objects are instantiated successfully
1149  * \retval                      negative error number on failure
1150  */
1151 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
1152                            struct lov_ost_data_v1 *objs, int comp_idx)
1153 {
1154         struct lod_layout_component *lod_comp;
1155         struct lod_thread_info *info = lod_env_info(env);
1156         struct lod_device *md;
1157         struct lu_object *o, *n;
1158         struct lu_device *nd;
1159         struct dt_object **stripe = NULL;
1160         __u32 *ost_indices = NULL;
1161         int stripe_len;
1162         int i, rc = 0;
1163         __u32 idx;
1164         ENTRY;
1165
1166         LASSERT(lo != NULL);
1167         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1168
1169         LASSERT(lo->ldo_comp_cnt != 0 && lo->ldo_comp_entries != NULL);
1170         lod_comp = &lo->ldo_comp_entries[comp_idx];
1171
1172         LASSERT(lod_comp->llc_stripe == NULL);
1173         LASSERT(lod_comp->llc_stripe_count > 0);
1174         LASSERT(lod_comp->llc_stripe_size > 0);
1175
1176         stripe_len = lod_comp->llc_stripe_count;
1177         OBD_ALLOC_PTR_ARRAY(stripe, stripe_len);
1178         if (stripe == NULL)
1179                 RETURN(-ENOMEM);
1180         OBD_ALLOC_PTR_ARRAY(ost_indices, stripe_len);
1181         if (!ost_indices)
1182                 GOTO(out, rc = -ENOMEM);
1183
1184         for (i = 0; i < lod_comp->llc_stripe_count; i++) {
1185                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
1186                         continue;
1187
1188                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
1189                 idx = le32_to_cpu(objs[i].l_ost_idx);
1190                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
1191                 if (rc != 0)
1192                         GOTO(out, rc);
1193                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
1194                          PFID(&info->lti_fid));
1195                 lod_getref(&md->lod_ost_descs);
1196
1197                 rc = validate_lod_and_idx(md, idx);
1198                 if (unlikely(rc != 0)) {
1199                         lod_putref(md, &md->lod_ost_descs);
1200                         GOTO(out, rc);
1201                 }
1202
1203                 nd = &OST_TGT(md, idx)->ltd_tgt->dd_lu_dev;
1204                 lod_putref(md, &md->lod_ost_descs);
1205
1206                 /* In the function below, .hs_keycmp resolves to
1207                  * u_obj_hop_keycmp() */
1208                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
1209                 if (IS_ERR(o))
1210                         GOTO(out, rc = PTR_ERR(o));
1211
1212                 n = lu_object_locate(o->lo_header, nd->ld_type);
1213                 LASSERT(n);
1214
1215                 stripe[i] = container_of(n, struct dt_object, do_lu);
1216                 ost_indices[i] = idx;
1217         }
1218
1219 out:
1220         if (rc != 0) {
1221                 for (i = 0; i < stripe_len; i++)
1222                         if (stripe[i] != NULL)
1223                                 dt_object_put(env, stripe[i]);
1224
1225                 OBD_FREE_PTR_ARRAY(stripe, stripe_len);
1226                 lod_comp->llc_stripe_count = 0;
1227                 if (ost_indices)
1228                         OBD_FREE_PTR_ARRAY(ost_indices, stripe_len);
1229         } else {
1230                 lod_comp->llc_stripe = stripe;
1231                 lod_comp->llc_ost_indices = ost_indices;
1232                 lod_comp->llc_stripes_allocated = stripe_len;
1233         }
1234
1235         RETURN(rc);
1236 }
1237
1238 int lod_init_comp_foreign(struct lod_layout_component *lod_comp, void *lmm)
1239 {
1240         struct lov_foreign_md *lfm;
1241
1242         lfm = (struct lov_foreign_md *)lmm;
1243         lod_comp->llc_length = le32_to_cpu(lfm->lfm_length);
1244         lod_comp->llc_type = le32_to_cpu(lfm->lfm_type);
1245
1246         if (!lov_hsm_type_supported(lod_comp->llc_type)) {
1247                 CDEBUG(D_LAYOUT,
1248                        "Unsupport HSM type: %u length: %u flags: %08X\n",
1249                        lod_comp->llc_type, lod_comp->llc_length,
1250                        le32_to_cpu(lfm->lfm_flags));
1251                 return -EINVAL;
1252         }
1253
1254         /*
1255          * Currently it only stores the file FID as the field @lhm_archive_uuid
1256          * which is used to be the identifier within HSM backend for the archive
1257          * copy.
1258          * Thus the length of foreign layout value (HSM is a kind of foreign
1259          * layout type) is: sizeof(lhm_archive_id) + sizeof(lhm_archive_ver) +
1260          *                  UUID_MAX
1261          * It should fix to support other kinds of identifier for different HSM
1262          * solutions such as S3.
1263          */
1264         if (lod_comp->llc_length != sizeof(struct lov_hsm_base)) {
1265                 CDEBUG(D_LAYOUT, "Invalid HSM len: %u, should be %zu\n",
1266                        lod_comp->llc_length, sizeof(struct lov_hsm_base));
1267                 return -EINVAL;
1268         }
1269
1270         lod_comp->llc_foreign_flags = le32_to_cpu(lfm->lfm_flags);
1271         lov_foreign_hsm_to_cpu(&lod_comp->llc_hsm, lfm);
1272         return 0;
1273 }
1274
1275 /**
1276  * Instantiate objects for striping.
1277  *
1278  * Parse striping information in \a buf and instantiate the objects
1279  * representing the stripes.
1280  *
1281  * \param[in] env               execution environment for this thread
1282  * \param[in] lo                LOD object
1283  * \param[in] buf               buffer storing LOV EA to parse
1284  * \param[in] lvf               verify flags when parsing the layout
1285  *
1286  * \retval                      0 if parsing and objects creation succeed
1287  * \retval                      negative error number on failure
1288  */
1289 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
1290                        const struct lu_buf *buf, enum layout_verify_flags lvf)
1291 {
1292         struct lod_device *d = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1293         struct lov_mds_md_v1 *lmm;
1294         struct lov_comp_md_v1 *comp_v1 = NULL;
1295         struct lov_foreign_md *foreign = NULL;
1296         struct lov_ost_data_v1 *objs;
1297         __u32 magic, pattern;
1298         __u16 mirror_cnt = 0;
1299         __u16 comp_cnt;
1300         __u64 dom_size = 0;
1301         int i, rc;
1302         __u16 mirror_id = MIRROR_ID_NEG;
1303         bool stale = false;
1304         int stale_mirrors = 0;
1305         ENTRY;
1306
1307         LASSERT(buf);
1308         LASSERT(buf->lb_buf);
1309         LASSERT(buf->lb_len);
1310         LASSERT(mutex_is_locked(&lo->ldo_layout_mutex));
1311
1312         lmm = (struct lov_mds_md_v1 *)buf->lb_buf;
1313         magic = le32_to_cpu(lmm->lmm_magic);
1314
1315         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3 &&
1316             magic != LOV_MAGIC_COMP_V1 && magic != LOV_MAGIC_FOREIGN &&
1317             magic != LOV_MAGIC_SEL)
1318                 GOTO(out, rc = -EINVAL);
1319
1320         lod_striping_free_nolock(env, lo);
1321
1322         if (magic == LOV_MAGIC_COMP_V1 || magic == LOV_MAGIC_SEL) {
1323                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
1324                 comp_cnt = le16_to_cpu(comp_v1->lcm_entry_count);
1325                 if (comp_cnt == 0)
1326                         GOTO(out, rc = -EINVAL);
1327
1328                 lo->ldo_layout_gen = le32_to_cpu(comp_v1->lcm_layout_gen);
1329                 lo->ldo_is_composite = 1;
1330                 mirror_cnt = le16_to_cpu(comp_v1->lcm_mirror_count) + 1;
1331                 if (mirror_cnt > 1)
1332                         lo->ldo_flr_state = le16_to_cpu(comp_v1->lcm_flags) &
1333                                                         LCM_FL_FLR_MASK;
1334                 else
1335                         lo->ldo_flr_state = LCM_FL_NONE;
1336         } else if (magic == LOV_MAGIC_FOREIGN) {
1337                 size_t length;
1338
1339                 foreign = (struct lov_foreign_md *)buf->lb_buf;
1340                 length = offsetof(typeof(*foreign), lfm_value);
1341                 if (buf->lb_len < length ||
1342                     buf->lb_len < (length + le32_to_cpu(foreign->lfm_length))) {
1343                         CDEBUG(D_LAYOUT,
1344                                "buf len %zu too small for lov_foreign_md\n",
1345                                buf->lb_len);
1346                         GOTO(out, rc = -EINVAL);
1347                 }
1348
1349                 /* just cache foreign LOV EA raw */
1350                 rc = lod_alloc_foreign_lov(lo, length);
1351                 if (rc)
1352                         GOTO(out, rc);
1353                 memcpy(lo->ldo_foreign_lov, buf->lb_buf, length);
1354                 GOTO(out, rc);
1355         } else {
1356                 comp_cnt = 1;
1357                 lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1358                 lo->ldo_is_composite = 0;
1359         }
1360
1361         rc = lod_alloc_comp_entries(lo, mirror_cnt, comp_cnt);
1362         if (rc)
1363                 GOTO(out, rc);
1364
1365         for (i = 0; i < comp_cnt; i++) {
1366                 struct lod_layout_component *lod_comp;
1367                 struct lu_extent *ext;
1368                 __u32 offs;
1369
1370                 lod_comp = &lo->ldo_comp_entries[i];
1371                 if (lo->ldo_is_composite) {
1372                         offs = le32_to_cpu(comp_v1->lcm_entries[i].lcme_offset);
1373                         lmm = (struct lov_mds_md_v1 *)((char *)comp_v1 + offs);
1374
1375                         ext = &comp_v1->lcm_entries[i].lcme_extent;
1376                         lod_comp->llc_extent.e_start =
1377                                 le64_to_cpu(ext->e_start);
1378                         if (lod_comp->llc_extent.e_start &
1379                             (LOV_MIN_STRIPE_SIZE - 1)) {
1380                                 CDEBUG(D_LAYOUT,
1381                                        "extent start %llu is not a multiple of min size %u\n",
1382                                        lod_comp->llc_extent.e_start,
1383                                        LOV_MIN_STRIPE_SIZE);
1384                                 GOTO(out, rc = -EINVAL);
1385                         }
1386
1387                         lod_comp->llc_extent.e_end = le64_to_cpu(ext->e_end);
1388                         if (lod_comp->llc_extent.e_end != LUSTRE_EOF &&
1389                             lod_comp->llc_extent.e_end &
1390                             (LOV_MIN_STRIPE_SIZE - 1)) {
1391                                 CDEBUG(D_LAYOUT,
1392                                        "extent end %llu is not a multiple of min size %u\n",
1393                                        lod_comp->llc_extent.e_end,
1394                                        LOV_MIN_STRIPE_SIZE);
1395                                 GOTO(out, rc = -EINVAL);
1396                         }
1397
1398                         lod_comp->llc_flags =
1399                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_flags);
1400
1401                         if (lod_comp->llc_flags & LCME_FL_NOSYNC)
1402                                 lod_comp->llc_timestamp = le64_to_cpu(
1403                                         comp_v1->lcm_entries[i].lcme_timestamp);
1404                         lod_comp->llc_id =
1405                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_id);
1406                         if (lod_comp->llc_id == LCME_ID_INVAL)
1407                                 GOTO(out, rc = -EINVAL);
1408
1409                         if (lvf & LVF_ALL_STALE) {
1410                                 if (mirror_id_of(lod_comp->llc_id) ==
1411                                     mirror_id) {
1412                                         /* remaining comps in the mirror */
1413                                         stale |= lod_comp->llc_flags &
1414                                                  LCME_FL_STALE;
1415                                 } else {
1416                                         /*
1417                                          * new mirror, check last mirror's
1418                                          * stale-ness
1419                                          */
1420                                         if (stale)
1421                                                 stale_mirrors++;
1422
1423                                         mirror_id =
1424                                                 mirror_id_of(lod_comp->llc_id);
1425
1426                                         /* the first comp of the new mirror */
1427                                         stale = lod_comp->llc_flags &
1428                                                 LCME_FL_STALE;
1429                                 }
1430                         }
1431
1432                         if ((lod_comp->llc_flags & LCME_FL_EXTENSION) &&
1433                             comp_v1->lcm_magic != cpu_to_le32(LOV_MAGIC_SEL)) {
1434                                 CWARN("%s: EXTENSION flags=%x set on component[%u]=%x of non-SEL file "DFID" with magic=%#08x\n",
1435                                       lod2obd(d)->obd_name,
1436                                       lod_comp->llc_flags, lod_comp->llc_id, i,
1437                                       PFID(lod_object_fid(lo)),
1438                                       le32_to_cpu(comp_v1->lcm_magic));
1439                         }
1440
1441                         lod_comp->llc_magic = le32_to_cpu(lmm->lmm_magic);
1442                         if (lod_comp->llc_magic == LOV_MAGIC_FOREIGN) {
1443                                 rc = lod_init_comp_foreign(lod_comp, lmm);
1444                                 if (rc)
1445                                         GOTO(out, rc);
1446                                 continue;
1447                         }
1448                 } else {
1449                         lod_comp->llc_magic = le32_to_cpu(lmm->lmm_magic);
1450                         lod_comp_set_init(lod_comp);
1451                 }
1452
1453                 pattern = le32_to_cpu(lmm->lmm_pattern);
1454                 if (!lov_pattern_supported(lov_pattern(pattern)))
1455                         GOTO(out, rc = -EINVAL);
1456
1457                 if (pattern & LOV_PATTERN_MDT) {
1458                         if (lod_comp->llc_extent.e_start != 0) {
1459                                 CERROR("%s: DOM entry must be the first stripe "
1460                                        "in a mirror\n", lod2obd(d)->obd_name);
1461                                 GOTO(out, rc = -EINVAL);
1462                         }
1463                         if (!dom_size) {
1464                                 dom_size = lod_comp->llc_extent.e_end;
1465                         } else if (dom_size != lod_comp->llc_extent.e_end) {
1466                                 CERROR("%s: DOM entries with different sizes "
1467                                        "%#llx/%#llx\n", lod2obd(d)->obd_name,
1468                                        dom_size, lod_comp->llc_extent.e_end);
1469                                 GOTO(out, rc = -EINVAL);
1470                         }
1471                 }
1472
1473                 lod_comp->llc_pattern = pattern;
1474                 lod_comp->llc_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
1475                 lod_comp->llc_stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
1476                 lod_comp->llc_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1477
1478                 if (lmm->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)) {
1479                         struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
1480
1481                         lod_set_pool(&lod_comp->llc_pool, v3->lmm_pool_name);
1482                         objs = &v3->lmm_objects[0];
1483                 } else {
1484                         lod_set_pool(&lod_comp->llc_pool, NULL);
1485                         objs = &lmm->lmm_objects[0];
1486                 }
1487
1488                 /**
1489                  * If uninstantiated template component has valid l_ost_idx,
1490                  * then user has specified ost list for this component.
1491                  */
1492                 if (!lod_comp_inited(lod_comp)) {
1493                         __u16 stripe_count;
1494
1495                         if (objs[0].l_ost_idx != (__u32)-1UL) {
1496                                 int j;
1497
1498                                 stripe_count = lod_comp_entry_stripe_count(
1499                                                         lo, i, false);
1500                                 if (stripe_count == 0 &&
1501                                     !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1502                                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT))
1503                                         GOTO(out, rc = -E2BIG);
1504                                 /**
1505                                  * load the user specified ost list, when this
1506                                  * component is instantiated later, it will be
1507                                  * used in lod_alloc_ost_list().
1508                                  */
1509                                 lod_comp->llc_ostlist.op_count = stripe_count;
1510                                 lod_comp->llc_ostlist.op_size =
1511                                         stripe_count * sizeof(__u32);
1512                                 OBD_ALLOC(lod_comp->llc_ostlist.op_array,
1513                                           lod_comp->llc_ostlist.op_size);
1514                                 if (!lod_comp->llc_ostlist.op_array)
1515                                         GOTO(out, rc = -ENOMEM);
1516
1517                                 for (j = 0; j < stripe_count; j++)
1518                                         lod_comp->llc_ostlist.op_array[j] =
1519                                                 le32_to_cpu(objs[j].l_ost_idx);
1520
1521                                 /**
1522                                  * this component OST objects starts from the
1523                                  * first ost_idx, lod_alloc_ost_list() will
1524                                  * check this.
1525                                  */
1526                                 lod_comp->llc_stripe_offset = objs[0].l_ost_idx;
1527                         } else {
1528                                 /**
1529                                  * for uninstantiated component,
1530                                  * lmm_layout_gen stores default stripe offset.
1531                                  */
1532                                 lod_comp->llc_stripe_offset =
1533                                                         lmm->lmm_layout_gen;
1534                         }
1535                 }
1536
1537                 /* skip un-instantiated component object initialization */
1538                 if (!lod_comp_inited(lod_comp))
1539                         continue;
1540
1541                 if (!(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1542                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
1543                         rc = lod_initialize_objects(env, lo, objs, i);
1544                         if (rc)
1545                                 GOTO(out, rc);
1546                 }
1547         }
1548
1549         if (lo->ldo_is_composite && (lvf & LVF_ALL_STALE)) {
1550                 /* check the last mirror stale-ness */
1551                 if (stale)
1552                         stale_mirrors++;
1553
1554                 if (mirror_cnt == stale_mirrors) {
1555                         rc = -EPERM;
1556                         CERROR("%s: can not set all stale mirrors for "
1557                                DFID": rc = %d\n",
1558                                lod2obd(d)->obd_name, PFID(lod_object_fid(lo)),
1559                                rc);
1560                         GOTO(out, rc);
1561                 }
1562         }
1563
1564         rc = lod_fill_mirrors(lo);
1565         if (rc)
1566                 GOTO(out, rc);
1567
1568 out:
1569         if (rc)
1570                 lod_striping_free_nolock(env, lo);
1571         RETURN(rc);
1572 }
1573
1574 /**
1575  * Check whether the striping (LOVEA for regular file, LMVEA for directory)
1576  * is already cached.
1577  *
1578  * \param[in] lo        LOD object
1579  *
1580  * \retval              True if the striping is cached, otherwise
1581  *                      return false.
1582  */
1583 static bool lod_striping_loaded(struct lod_object *lo)
1584 {
1585         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1586             lo->ldo_comp_cached)
1587                 return true;
1588
1589         if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1590                 if (lo->ldo_dir_stripe_loaded)
1591                         return true;
1592
1593                 /* Never load LMV stripe for slaves of striped dir */
1594                 if (lo->ldo_dir_slave_stripe)
1595                         return true;
1596         }
1597
1598         return false;
1599 }
1600
1601 /**
1602  * A generic function to initialize the stripe objects.
1603  *
1604  * A protected version of lod_striping_load_locked() - load the striping
1605  * information from storage, parse that and instantiate LU objects to
1606  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1607  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1608  * return an array of references to the newly instantiated objects.
1609  *
1610  * \param[in] env               execution environment for this thread
1611  * \param[in,out] lo            LOD object, where striping is stored and
1612  *                              which gets an array of references
1613  *
1614  * \retval                      0 if parsing and object creation succeed
1615  * \retval                      negative error number on failure
1616  **/
1617 int lod_striping_load(const struct lu_env *env, struct lod_object *lo)
1618 {
1619         struct lod_thread_info *info = lod_env_info(env);
1620         struct dt_object *next = dt_object_child(&lo->ldo_obj);
1621         struct lu_buf *buf = &info->lti_buf;
1622         int rc = 0;
1623
1624         ENTRY;
1625
1626         if (!dt_object_exists(next))
1627                 RETURN(0);
1628
1629         if (lod_striping_loaded(lo))
1630                 RETURN(0);
1631
1632         mutex_lock(&lo->ldo_layout_mutex);
1633         if (lod_striping_loaded(lo))
1634                 GOTO(unlock, rc = 0);
1635
1636         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr)) {
1637                 rc = lod_get_lov_ea(env, lo);
1638                 if (rc <= 0)
1639                         GOTO(unlock, rc);
1640
1641                 /*
1642                  * there is LOV EA (striping information) in this object
1643                  * let's parse it and create in-core objects for the stripes
1644                  */
1645                 buf->lb_buf = info->lti_ea_store;
1646                 buf->lb_len = info->lti_ea_store_size;
1647                 rc = lod_parse_striping(env, lo, buf, 0);
1648                 if (rc == 0)
1649                         lo->ldo_comp_cached = 1;
1650         } else if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1651                 rc = lod_get_lmv_ea(env, lo);
1652
1653                 if (rc > (int)sizeof(struct lmv_foreign_md)) {
1654                         struct lmv_foreign_md *lfm = info->lti_ea_store;
1655
1656                         if (le32_to_cpu(lfm->lfm_magic) == LMV_MAGIC_FOREIGN) {
1657                                 lo->ldo_foreign_lmv = info->lti_ea_store;
1658                                 lo->ldo_foreign_lmv_size =
1659                                         info->lti_ea_store_size;
1660                                 info->lti_ea_store = NULL;
1661                                 info->lti_ea_store_size = 0;
1662
1663                                 lo->ldo_dir_stripe_loaded = 1;
1664                                 lo->ldo_is_foreign = 1;
1665                                 GOTO(unlock, rc = 0);
1666                         }
1667                 }
1668
1669                 if (rc < (int)sizeof(struct lmv_mds_md_v1)) {
1670                         /* Let's set stripe_loaded to avoid further
1671                          * stripe loading especially for non-stripe directory,
1672                          * which can hurt performance. (See LU-9840)
1673                          */
1674                         if (rc == 0)
1675                                 lo->ldo_dir_stripe_loaded = 1;
1676                         GOTO(unlock, rc = rc > 0 ? -EINVAL : rc);
1677                 }
1678                 buf->lb_buf = info->lti_ea_store;
1679                 buf->lb_len = info->lti_ea_store_size;
1680                 if (rc == sizeof(struct lmv_mds_md_v1)) {
1681                         rc = lod_load_lmv_shards(env, lo, buf, true);
1682                         if (buf->lb_buf != info->lti_ea_store) {
1683                                 OBD_FREE_LARGE(info->lti_ea_store,
1684                                                info->lti_ea_store_size);
1685                                 info->lti_ea_store = buf->lb_buf;
1686                                 info->lti_ea_store_size = buf->lb_len;
1687                         }
1688
1689                         if (rc < 0)
1690                                 GOTO(unlock, rc);
1691                 }
1692
1693                 /*
1694                  * there is LMV EA (striping information) in this object
1695                  * let's parse it and create in-core objects for the stripes
1696                  */
1697                 rc = lod_parse_dir_striping(env, lo, buf);
1698                 if (rc == 0)
1699                         lo->ldo_dir_stripe_loaded = 1;
1700         }
1701         EXIT;
1702 unlock:
1703         mutex_unlock(&lo->ldo_layout_mutex);
1704
1705         return rc;
1706 }
1707
1708 int lod_striping_reload(const struct lu_env *env, struct lod_object *lo,
1709                         const struct lu_buf *buf, enum layout_verify_flags lvf)
1710 {
1711         int rc;
1712
1713         ENTRY;
1714
1715         mutex_lock(&lo->ldo_layout_mutex);
1716         rc = lod_parse_striping(env, lo, buf, lvf);
1717         mutex_unlock(&lo->ldo_layout_mutex);
1718
1719         RETURN(rc);
1720 }
1721
1722 /**
1723  * Verify lov_user_md_v1/v3 striping.
1724  *
1725  * Check the validity of all fields including the magic, stripe size,
1726  * stripe count, stripe offset and that the pool is present.  Also check
1727  * that each target index points to an existing target. The additional
1728  * \a is_from_disk turns additional checks. In some cases zero fields
1729  * are allowed (like pattern=0).
1730  *
1731  * \param[in] d                 LOD device
1732  * \param[in] buf               buffer with LOV EA to verify
1733  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1734  *                              1 - from disk, do not allow
1735  *
1736  * \retval                      0 if the striping is valid
1737  * \retval                      -EINVAL if striping is invalid
1738  */
1739 static int lod_verify_v1v3(struct lod_device *d, const struct lu_buf *buf,
1740                            bool is_from_disk)
1741 {
1742         struct lov_user_md_v1   *lum;
1743         struct lov_user_md_v3   *lum3;
1744         struct lod_pool_desc    *pool = NULL;
1745         __u32                    magic;
1746         __u32                    stripe_size;
1747         __u16                    stripe_count;
1748         __u16                    stripe_offset;
1749         size_t                   lum_size;
1750         int                      rc = 0;
1751         ENTRY;
1752
1753         lum = buf->lb_buf;
1754
1755         if (buf->lb_len < sizeof(*lum)) {
1756                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1757                        buf->lb_len);
1758                 GOTO(out, rc = -EINVAL);
1759         }
1760
1761         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1762         if (magic != LOV_USER_MAGIC_V1 &&
1763             magic != LOV_USER_MAGIC_V3 &&
1764             magic != LOV_USER_MAGIC_SPECIFIC) {
1765                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1766                        le32_to_cpu(lum->lmm_magic));
1767                 GOTO(out, rc = -EINVAL);
1768         }
1769
1770         /* the user uses "0" for default stripe pattern normally. */
1771         if (!is_from_disk && lum->lmm_pattern == LOV_PATTERN_NONE)
1772                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1773
1774         if (!lov_pattern_supported(le32_to_cpu(lum->lmm_pattern))) {
1775                 CDEBUG(D_LAYOUT, "bad userland stripe pattern: %#x\n",
1776                        le32_to_cpu(lum->lmm_pattern));
1777                 GOTO(out, rc = -EINVAL);
1778         }
1779
1780         /* a released lum comes from creating orphan on hsm release,
1781          * doesn't make sense to verify it. */
1782         if (le32_to_cpu(lum->lmm_pattern) & LOV_PATTERN_F_RELEASED)
1783                 GOTO(out, rc = 0);
1784
1785         /* 64kB is the largest common page size we see (ia64), and matches the
1786          * check in lfs */
1787         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1788         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1789                 CDEBUG(D_LAYOUT, "stripe size %u not a multiple of %u\n",
1790                        stripe_size, LOV_MIN_STRIPE_SIZE);
1791                 GOTO(out, rc = -EINVAL);
1792         }
1793
1794         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1795         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT &&
1796             !(lov_pattern(le32_to_cpu(lum->lmm_pattern)) & LOV_PATTERN_MDT)) {
1797                 /* if offset is not within valid range [0, osts_size) */
1798                 if (stripe_offset >= d->lod_ost_descs.ltd_tgts_size) {
1799                         CDEBUG(D_LAYOUT, "stripe offset %u >= bitmap size %u\n",
1800                                stripe_offset, d->lod_ost_descs.ltd_tgts_size);
1801                         GOTO(out, rc = -EINVAL);
1802                 }
1803
1804                 /* if lmm_stripe_offset is *not* in bitmap */
1805                 if (!test_bit(stripe_offset, d->lod_ost_bitmap)) {
1806                         CDEBUG(D_LAYOUT, "stripe offset %u not in bitmap\n",
1807                                stripe_offset);
1808                         GOTO(out, rc = -EINVAL);
1809                 }
1810         }
1811
1812         if (magic == LOV_USER_MAGIC_V1)
1813                 lum_size = offsetof(struct lov_user_md_v1,
1814                                     lmm_objects[0]);
1815         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC)
1816                 lum_size = offsetof(struct lov_user_md_v3,
1817                                     lmm_objects[0]);
1818         else
1819                 GOTO(out, rc = -EINVAL);
1820
1821         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1822         if (buf->lb_len < lum_size) {
1823                 CDEBUG(D_LAYOUT, "invalid buf len %zu/%zu for lov_user_md with "
1824                        "magic %#x and stripe_count %u\n",
1825                        buf->lb_len, lum_size, magic, stripe_count);
1826                 GOTO(out, rc = -EINVAL);
1827         }
1828
1829         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC))
1830                 goto out;
1831
1832         lum3 = buf->lb_buf;
1833         /* In the function below, .hs_keycmp resolves to
1834          * pool_hashkey_keycmp() */
1835         pool = lod_find_pool(d, lum3->lmm_pool_name);
1836         if (pool == NULL)
1837                 goto out;
1838
1839         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT) {
1840                 rc = lod_check_index_in_pool(stripe_offset, pool);
1841                 if (rc < 0)
1842                         GOTO(out, rc = -EINVAL);
1843         }
1844
1845         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1846                 CDEBUG(D_LAYOUT, "stripe count %u > # OSTs %u in the pool\n",
1847                        stripe_count, pool_tgt_count(pool));
1848                 GOTO(out, rc = -EINVAL);
1849         }
1850
1851 out:
1852         if (pool != NULL)
1853                 lod_pool_putref(pool);
1854
1855         RETURN(rc);
1856 }
1857
1858 static inline
1859 struct lov_comp_md_entry_v1 *comp_entry_v1(struct lov_comp_md_v1 *comp, int i)
1860 {
1861         LASSERTF((le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1862                  LOV_USER_MAGIC_COMP_V1 ||
1863                  (le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1864                  LOV_USER_MAGIC_SEL, "Wrong magic %x\n",
1865                  le32_to_cpu(comp->lcm_magic));
1866         LASSERTF(i >= 0 && i < le16_to_cpu(comp->lcm_entry_count),
1867                  "bad index %d, max = %d\n",
1868                  i, le16_to_cpu(comp->lcm_entry_count));
1869
1870         return &comp->lcm_entries[i];
1871 }
1872
1873 #define for_each_comp_entry_v1(comp, entry) \
1874         for (entry = comp_entry_v1(comp, 0); \
1875              entry <= comp_entry_v1(comp, \
1876                                    le16_to_cpu(comp->lcm_entry_count) - 1); \
1877              entry++)
1878
1879 static int lod_erase_dom_stripe(struct lov_comp_md_v1 *comp_v1,
1880                                 struct lov_comp_md_entry_v1 *dom_ent)
1881 {
1882         struct lov_comp_md_entry_v1 *ent;
1883         __u16 entries;
1884         __u32 dom_off, dom_size, comp_size, off;
1885         void *src, *dst;
1886         unsigned int size, shift;
1887
1888         entries = le16_to_cpu(comp_v1->lcm_entry_count) - 1;
1889         LASSERT(entries > 0);
1890         comp_v1->lcm_entry_count = cpu_to_le16(entries);
1891
1892         comp_size = le32_to_cpu(comp_v1->lcm_size);
1893         dom_off = le32_to_cpu(dom_ent->lcme_offset);
1894         dom_size = le32_to_cpu(dom_ent->lcme_size);
1895
1896         /* all entries offsets are shifted by entry size at least */
1897         shift = sizeof(*dom_ent);
1898         for_each_comp_entry_v1(comp_v1, ent) {
1899                 off = le32_to_cpu(ent->lcme_offset);
1900                 if (off == dom_off) {
1901                         /* Entry deletion creates two holes in layout data:
1902                          * - hole in entries array
1903                          * - hole in layout data at dom_off with dom_size
1904                          *
1905                          * First memmove is one entry shift from next entry
1906                          * start with size up to dom_off in blob
1907                          */
1908                         dst = (void *)ent;
1909                         src = (void *)(ent + 1);
1910                         size = (unsigned long)((void *)comp_v1 + dom_off - src);
1911                         memmove(dst, src, size);
1912                         /* take 'off' from just moved entry */
1913                         off = le32_to_cpu(ent->lcme_offset);
1914                         /* second memmove is blob tail after 'off' up to
1915                          * component end
1916                          */
1917                         dst = (void *)comp_v1 + dom_off - sizeof(*ent);
1918                         src = (void *)comp_v1 + off;
1919                         size = (unsigned long)(comp_size - off);
1920                         memmove(dst, src, size);
1921                         /* all entries offsets after DoM entry are shifted by
1922                          * dom_size additionally
1923                          */
1924                         shift += dom_size;
1925                 }
1926                 ent->lcme_offset = cpu_to_le32(off - shift);
1927         }
1928         comp_v1->lcm_size = cpu_to_le32(comp_size - shift);
1929
1930         /* notify a caller to re-check entry */
1931         return -ERESTART;
1932 }
1933
1934 void lod_dom_stripesize_recalc(struct lod_device *d)
1935 {
1936         __u64 threshold_mb = d->lod_dom_threshold_free_mb;
1937         __u32 max_size = d->lod_dom_stripesize_max_kb;
1938         __u32 def_size = d->lod_dom_stripesize_cur_kb;
1939
1940         /* use maximum allowed value if free space is above threshold */
1941         if (d->lod_lsfs_free_mb >= threshold_mb) {
1942                 def_size = max_size;
1943         } else if (!d->lod_lsfs_free_mb || max_size <= LOD_DOM_MIN_SIZE_KB) {
1944                 def_size = 0;
1945         } else {
1946                 /* recalc threshold like it would be with def_size as max */
1947                 threshold_mb = mult_frac(threshold_mb, def_size, max_size);
1948                 if (d->lod_lsfs_free_mb < threshold_mb)
1949                         def_size = rounddown(def_size / 2, LOD_DOM_MIN_SIZE_KB);
1950                 else if (d->lod_lsfs_free_mb > threshold_mb * 2)
1951                         def_size = max_t(unsigned int, def_size * 2,
1952                                          LOD_DOM_MIN_SIZE_KB);
1953         }
1954
1955         if (d->lod_dom_stripesize_cur_kb != def_size) {
1956                 CDEBUG(D_LAYOUT, "Change default DOM stripe size %d->%d\n",
1957                        d->lod_dom_stripesize_cur_kb, def_size);
1958                 d->lod_dom_stripesize_cur_kb = def_size;
1959         }
1960 }
1961
1962 static __u32 lod_dom_stripesize_limit(const struct lu_env *env,
1963                                       struct lod_device *d)
1964 {
1965         int rc;
1966
1967         /* set bfree as fraction of total space */
1968         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_STATFS_SPOOF)) {
1969                 spin_lock(&d->lod_lsfs_lock);
1970                 d->lod_lsfs_free_mb = mult_frac(d->lod_lsfs_total_mb,
1971                                         min_t(int, cfs_fail_val, 100), 100);
1972                 GOTO(recalc, rc = 0);
1973         }
1974
1975         if (d->lod_lsfs_age < ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE) {
1976                 struct obd_statfs sfs;
1977
1978                 spin_lock(&d->lod_lsfs_lock);
1979                 if (d->lod_lsfs_age > ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE)
1980                         GOTO(unlock, rc = 0);
1981
1982                 d->lod_lsfs_age = ktime_get_seconds();
1983                 spin_unlock(&d->lod_lsfs_lock);
1984                 rc = dt_statfs(env, d->lod_child, &sfs);
1985                 if (rc) {
1986                         CDEBUG(D_LAYOUT,
1987                                "%s: failed to get OSD statfs: rc = %d\n",
1988                                lod2obd(d)->obd_name, rc);
1989                         GOTO(out, rc);
1990                 }
1991                 /* udpate local OSD cached statfs data */
1992                 spin_lock(&d->lod_lsfs_lock);
1993                 d->lod_lsfs_total_mb = (sfs.os_blocks * sfs.os_bsize) >> 20;
1994                 d->lod_lsfs_free_mb = (sfs.os_bfree * sfs.os_bsize) >> 20;
1995 recalc:
1996                 lod_dom_stripesize_recalc(d);
1997 unlock:
1998                 spin_unlock(&d->lod_lsfs_lock);
1999         }
2000 out:
2001         return d->lod_dom_stripesize_cur_kb << 10;
2002 }
2003
2004 static int lod_dom_stripesize_choose(const struct lu_env *env,
2005                                      struct lod_device *d,
2006                                      struct lov_comp_md_v1 *comp_v1,
2007                                      struct lov_comp_md_entry_v1 *dom_ent,
2008                                      __u32 stripe_size)
2009 {
2010         struct lov_comp_md_entry_v1 *ent;
2011         struct lu_extent *dom_ext, *ext;
2012         struct lov_user_md_v1 *lum;
2013         __u32 max_stripe_size;
2014         __u16 mid, dom_mid;
2015         int rc = 0;
2016         bool dom_next_entry = false;
2017
2018         dom_ext = &dom_ent->lcme_extent;
2019         dom_mid = mirror_id_of(le32_to_cpu(dom_ent->lcme_id));
2020         max_stripe_size = lod_dom_stripesize_limit(env, d);
2021
2022         /* Check stripe size againts current per-MDT limit */
2023         if (stripe_size <= max_stripe_size)
2024                 return 0;
2025
2026         lum = (void *)comp_v1 + le32_to_cpu(dom_ent->lcme_offset);
2027         CDEBUG(D_LAYOUT, "overwrite DoM component size %u with MDT limit %u\n",
2028                stripe_size, max_stripe_size);
2029         lum->lmm_stripe_size = cpu_to_le32(max_stripe_size);
2030
2031         /* In common case the DoM stripe is first entry in a mirror and
2032          * can be deleted only if it is not single entry in layout or
2033          * mirror, otherwise error should be returned.
2034          */
2035         for_each_comp_entry_v1(comp_v1, ent) {
2036                 if (ent == dom_ent)
2037                         continue;
2038
2039                 mid = mirror_id_of(le32_to_cpu(ent->lcme_id));
2040                 if (mid != dom_mid)
2041                         continue;
2042
2043                 ext = &ent->lcme_extent;
2044                 if (ext->e_start != dom_ext->e_end)
2045                         continue;
2046
2047                 /* Found next component after the DoM one with the same
2048                  * mirror_id and adjust its start with DoM component end.
2049                  *
2050                  * NOTE: we are considering here that there can be only one
2051                  * DoM component in a file, all replicas are located on OSTs
2052                  * always and don't need adjustment since use own layouts.
2053                  */
2054                 ext->e_start = cpu_to_le64(max_stripe_size);
2055                 dom_next_entry = true;
2056                 break;
2057         }
2058
2059         if (max_stripe_size == 0) {
2060                 /* DoM component size is zero due to server setting, remove
2061                  * it from the layout but only if next component exists in
2062                  * the same mirror. That must be checked prior calling the
2063                  * lod_erase_dom_stripe().
2064                  */
2065                 if (!dom_next_entry)
2066                         return -EFBIG;
2067
2068                 rc = lod_erase_dom_stripe(comp_v1, dom_ent);
2069         } else {
2070                 /* Update DoM extent end finally */
2071                 dom_ext->e_end = cpu_to_le64(max_stripe_size);
2072         }
2073
2074         return rc;
2075 }
2076
2077 /**
2078  * Verify LOV striping.
2079  *
2080  * \param[in] d                 LOD device
2081  * \param[in] buf               buffer with LOV EA to verify
2082  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
2083  *                              1 - from disk, do not allow
2084  * \param[in] start             extent start for composite layout
2085  *
2086  * \retval                      0 if the striping is valid
2087  * \retval                      -EINVAL if striping is invalid
2088  */
2089 int lod_verify_striping(const struct lu_env *env, struct lod_device *d,
2090                         struct lod_object *lo, const struct lu_buf *buf,
2091                         bool is_from_disk)
2092 {
2093         struct lov_user_md_v1   *lum;
2094         struct lov_comp_md_v1   *comp_v1;
2095         struct lov_comp_md_entry_v1     *ent;
2096         struct lu_extent        *ext;
2097         struct lu_buf   tmp;
2098         __u64   prev_end = 0;
2099         __u32   stripe_size = 0;
2100         __u16   prev_mid = -1, mirror_id = -1;
2101         __u32   mirror_count;
2102         __u32   magic;
2103         int     rc = 0;
2104         ENTRY;
2105
2106         if (buf->lb_len < sizeof(lum->lmm_magic)) {
2107                 CDEBUG(D_LAYOUT, "invalid buf len %zu\n", buf->lb_len);
2108                 RETURN(-EINVAL);
2109         }
2110
2111         lum = buf->lb_buf;
2112
2113         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
2114         /* treat foreign LOV EA/object case first
2115          * XXX is it expected to try setting again a foreign?
2116          * XXX should we care about different current vs new layouts ?
2117          */
2118         if (unlikely(magic == LOV_USER_MAGIC_FOREIGN)) {
2119                 struct lov_foreign_md *lfm = buf->lb_buf;
2120
2121                 if (buf->lb_len < offsetof(typeof(*lfm), lfm_value)) {
2122                         CDEBUG(D_LAYOUT,
2123                                "buf len %zu < min lov_foreign_md size (%zu)\n",
2124                                buf->lb_len, offsetof(typeof(*lfm),
2125                                lfm_value));
2126                         RETURN(-EINVAL);
2127                 }
2128
2129                 if (lov_foreign_size_le(lfm) > buf->lb_len) {
2130                         CDEBUG(D_LAYOUT,
2131                                "buf len %zu < this lov_foreign_md size (%zu)\n",
2132                                buf->lb_len, lov_foreign_size_le(lfm));
2133                         RETURN(-EINVAL);
2134                 }
2135                 /* Don't do anything with foreign layouts */
2136                 RETURN(0);
2137         }
2138
2139         /* normal LOV/layout cases */
2140
2141         if (buf->lb_len < sizeof(*lum)) {
2142                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
2143                        buf->lb_len);
2144                 RETURN(-EINVAL);
2145         }
2146
2147         switch (magic) {
2148         case LOV_USER_MAGIC_FOREIGN:
2149                 RETURN(0);
2150         case LOV_USER_MAGIC_V1:
2151         case LOV_USER_MAGIC_V3:
2152         case LOV_USER_MAGIC_SPECIFIC:
2153                 if (lov_pattern(le32_to_cpu(lum->lmm_pattern)) &
2154                     LOV_PATTERN_MDT) {
2155                         /* DoM must use composite layout */
2156                         CDEBUG(D_LAYOUT, "DoM without composite layout\n");
2157                         RETURN(-EINVAL);
2158                 }
2159                 RETURN(lod_verify_v1v3(d, buf, is_from_disk));
2160         case LOV_USER_MAGIC_COMP_V1:
2161         case LOV_USER_MAGIC_SEL:
2162                 break;
2163         default:
2164                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
2165                        le32_to_cpu(lum->lmm_magic));
2166                 RETURN(-EINVAL);
2167         }
2168
2169         /* magic == LOV_USER_MAGIC_COMP_V1 */
2170         comp_v1 = buf->lb_buf;
2171         if (buf->lb_len < le32_to_cpu(comp_v1->lcm_size)) {
2172                 CDEBUG(D_LAYOUT, "buf len %zu is less than %u\n",
2173                        buf->lb_len, le32_to_cpu(comp_v1->lcm_size));
2174                 RETURN(-EINVAL);
2175         }
2176
2177 recheck:
2178         mirror_count = 0;
2179         if (le16_to_cpu(comp_v1->lcm_entry_count) == 0) {
2180                 CDEBUG(D_LAYOUT, "entry count is zero\n");
2181                 RETURN(-EINVAL);
2182         }
2183
2184         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
2185             lo->ldo_comp_cnt > 0) {
2186                 /* could be called from lustre.lov.add */
2187                 __u32 cnt = lo->ldo_comp_cnt;
2188
2189                 ext = &lo->ldo_comp_entries[cnt - 1].llc_extent;
2190                 prev_end = ext->e_end;
2191
2192                 ++mirror_count;
2193         }
2194
2195         for_each_comp_entry_v1(comp_v1, ent) {
2196                 ext = &ent->lcme_extent;
2197
2198                 if (le64_to_cpu(ext->e_start) > le64_to_cpu(ext->e_end) ||
2199                     le64_to_cpu(ext->e_start) & (LOV_MIN_STRIPE_SIZE - 1) ||
2200                     ((__s64)le64_to_cpu(ext->e_start) < 0 &&
2201                     le64_to_cpu(ext->e_start) != LUSTRE_EOF) ||
2202                     (le64_to_cpu(ext->e_end) != LUSTRE_EOF &&
2203                     le64_to_cpu(ext->e_end) & (LOV_MIN_STRIPE_SIZE - 1)) ||
2204                     ((__s64)le64_to_cpu(ext->e_end) < 0 &&
2205                     le64_to_cpu(ext->e_end) != LUSTRE_EOF)) {
2206                         CDEBUG(D_LAYOUT, "invalid extent "DEXT"\n",
2207                                le64_to_cpu(ext->e_start),
2208                                le64_to_cpu(ext->e_end));
2209                         RETURN(-EINVAL);
2210                 }
2211
2212                 if (is_from_disk) {
2213                         /* lcme_id contains valid value */
2214                         if (le32_to_cpu(ent->lcme_id) == 0 ||
2215                             le32_to_cpu(ent->lcme_id) > LCME_ID_MAX) {
2216                                 CDEBUG(D_LAYOUT, "invalid id %u\n",
2217                                        le32_to_cpu(ent->lcme_id));
2218                                 RETURN(-EINVAL);
2219                         }
2220
2221                         if (le16_to_cpu(comp_v1->lcm_mirror_count) > 0) {
2222                                 mirror_id = mirror_id_of(
2223                                                 le32_to_cpu(ent->lcme_id));
2224
2225                                 /* first component must start with 0 */
2226                                 if (mirror_id != prev_mid &&
2227                                     le64_to_cpu(ext->e_start) != 0) {
2228                                         CDEBUG(D_LAYOUT,
2229                                                "invalid start:%llu, expect:0\n",
2230                                                le64_to_cpu(ext->e_start));
2231                                         RETURN(-EINVAL);
2232                                 }
2233
2234                                 prev_mid = mirror_id;
2235                         }
2236                 }
2237
2238                 if (le64_to_cpu(ext->e_start) == 0) {
2239                         ++mirror_count;
2240                         prev_end = 0;
2241                 }
2242
2243                 /* the next must be adjacent with the previous one */
2244                 if (le64_to_cpu(ext->e_start) != prev_end) {
2245                         CDEBUG(D_LAYOUT,
2246                                "invalid start actual:%llu, expect:%llu\n",
2247                                le64_to_cpu(ext->e_start), prev_end);
2248                         RETURN(-EINVAL);
2249                 }
2250
2251                 tmp.lb_buf = (char *)comp_v1 + le32_to_cpu(ent->lcme_offset);
2252                 tmp.lb_len = le32_to_cpu(ent->lcme_size);
2253
2254                 lum = tmp.lb_buf;
2255                 if (le32_to_cpu(lum->lmm_magic) == LOV_MAGIC_FOREIGN) {
2256                         struct lov_foreign_md *lfm;
2257                         struct lov_hsm_md *lhm;
2258                         u32 hsmsize;
2259                         u32 ftype;
2260
2261                         /*
2262                          * Currently when the foreign layout is used as a basic
2263                          * layout component, it only supports HSM foreign types:
2264                          * LU_FOREIGN_TYPE_{POSIX, S3, PCCRW, PCCRO}.
2265                          */
2266                         lfm = (struct lov_foreign_md *)lum;
2267                         ftype = le32_to_cpu(lfm->lfm_type);
2268                         if (!lov_hsm_type_supported(ftype)) {
2269                                 CDEBUG(D_LAYOUT,
2270                                        "Foreign type %#x is not HSM\n", ftype);
2271                                 RETURN(-EINVAL);
2272                         }
2273
2274                         /* Current HSM component must cover [0, EOF]. */
2275                         if (le64_to_cpu(ext->e_start) > 0) {
2276                                 CDEBUG(D_LAYOUT, "Invalid HSM component with %llu extent start\n",
2277                                        le64_to_cpu(ext->e_start));
2278                                 RETURN(-EINVAL);
2279                         }
2280                         if (le64_to_cpu(ext->e_end) != LUSTRE_EOF) {
2281                                 CDEBUG(D_LAYOUT, "Invalid HSM component with %llu extent end\n",
2282                                        le64_to_cpu(ext->e_end));
2283                                 RETURN(-EINVAL);
2284                         }
2285
2286                         lhm = (struct lov_hsm_md *)lfm;
2287                         hsmsize = lov_foreign_size_le(lhm);
2288
2289                         if (le32_to_cpu(lhm->lhm_length) !=
2290                             sizeof(struct lov_hsm_base)) {
2291                                 CDEBUG(D_LAYOUT,
2292                                        "Invalid HSM component size %u != %u\n",
2293                                        le32_to_cpu(ent->lcme_size), hsmsize);
2294                                 RETURN(-EINVAL);
2295                         }
2296
2297                         if (le32_to_cpu(ent->lcme_size) < hsmsize) {
2298                                 CDEBUG(D_LAYOUT,
2299                                        "Invalid HSM component size %u != %u\n",
2300                                        le32_to_cpu(ent->lcme_size), hsmsize);
2301                                 RETURN(-EINVAL);
2302                         }
2303                         if (le32_to_cpu(lhm->lhm_flags) & ~HSM_FLAGS_MASK ||
2304                             !(le32_to_cpu(lhm->lhm_flags) & HSM_FLAGS_MASK)) {
2305                                 CDEBUG(D_LAYOUT,
2306                                        "Invalid HSM component flags %#x\n",
2307                                        le32_to_cpu(lhm->lhm_flags));
2308                                 RETURN(-EINVAL);
2309                         }
2310                         continue;
2311                 }
2312
2313                 /* Check DoM entry is always the first one */
2314                 if (lov_pattern(le32_to_cpu(lum->lmm_pattern)) &
2315                     LOV_PATTERN_MDT) {
2316                         /* DoM component must be the first in a mirror */
2317                         if (le64_to_cpu(ext->e_start) > 0) {
2318                                 CDEBUG(D_LAYOUT, "invalid DoM component "
2319                                        "with %llu extent start\n",
2320                                        le64_to_cpu(ext->e_start));
2321                                 RETURN(-EINVAL);
2322                         }
2323                         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2324                         /* There is just one stripe on MDT and it must
2325                          * cover whole component size. */
2326                         if (stripe_size != le64_to_cpu(ext->e_end)) {
2327                                 CDEBUG(D_LAYOUT, "invalid DoM layout "
2328                                        "stripe size %u != %llu "
2329                                        "(component size)\n",
2330                                        stripe_size, prev_end);
2331                                 RETURN(-EINVAL);
2332                         }
2333                         /* Check and adjust stripe size by per-MDT limit */
2334                         rc = lod_dom_stripesize_choose(env, d, comp_v1, ent,
2335                                                        stripe_size);
2336                         /* DoM entry was removed, re-check layout from start */
2337                         if (rc == -ERESTART)
2338                                 goto recheck;
2339                         else if (rc)
2340                                 RETURN(rc);
2341
2342                         if (le16_to_cpu(lum->lmm_stripe_count) == 1)
2343                                 lum->lmm_stripe_count = 0;
2344                         /* Any stripe count is forbidden on DoM component */
2345                         if (lum->lmm_stripe_count > 0) {
2346                                 CDEBUG(D_LAYOUT,
2347                                        "invalid DoM layout stripe count %u, must be 0\n",
2348                                        le16_to_cpu(lum->lmm_stripe_count));
2349                                 RETURN(-EINVAL);
2350                         }
2351
2352                         /* Any pool is forbidden on DoM component */
2353                         if (lum->lmm_magic == LOV_USER_MAGIC_V3) {
2354                                 struct lov_user_md_v3 *v3 = (void *)lum;
2355
2356                                 if (v3->lmm_pool_name[0] != '\0') {
2357                                         CDEBUG(D_LAYOUT,
2358                                                "DoM component cannot have pool assigned\n");
2359                                         RETURN(-EINVAL);
2360                                 }
2361                         }
2362                 }
2363
2364                 prev_end = le64_to_cpu(ext->e_end);
2365
2366                 rc = lod_verify_v1v3(d, &tmp, is_from_disk);
2367                 if (rc)
2368                         RETURN(rc);
2369
2370                 if (prev_end == LUSTRE_EOF || ext->e_start == prev_end)
2371                         continue;
2372
2373                 /* extent end must be aligned with the stripe_size */
2374                 stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2375                 if (stripe_size && prev_end % stripe_size) {
2376                         CDEBUG(D_LAYOUT, "stripe size isn't aligned, "
2377                                "stripe_sz: %u, [%llu, %llu)\n",
2378                                stripe_size, ext->e_start, prev_end);
2379                         RETURN(-EINVAL);
2380                 }
2381         }
2382
2383         /* make sure that the mirror_count is telling the truth */
2384         if (mirror_count != le16_to_cpu(comp_v1->lcm_mirror_count) + 1)
2385                 RETURN(-EINVAL);
2386
2387         RETURN(0);
2388 }
2389
2390 /**
2391  * set the default stripe size, if unset.
2392  *
2393  * \param[in,out] val   number of bytes per OST stripe
2394  *
2395  * The minimum stripe size is 64KB to ensure that a single stripe is an
2396  * even multiple of a client PAGE_SIZE (IA64, PPC, etc).  Otherwise, it
2397  * is difficult to split dirty pages across OSCs during writes.
2398  */
2399 void lod_fix_desc_stripe_size(__u64 *val)
2400 {
2401         if (*val < LOV_MIN_STRIPE_SIZE) {
2402                 if (*val != 0)
2403                         LCONSOLE_INFO("Increasing default stripe size to "
2404                                       "minimum value %u\n",
2405                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
2406                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
2407         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
2408                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
2409                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
2410                               "multiple of %u)\n",
2411                               *val, LOV_MIN_STRIPE_SIZE);
2412         }
2413 }
2414
2415 /**
2416  * set the filesystem default number of stripes, if unset.
2417  *
2418  * \param[in,out] val   number of stripes
2419  *
2420  * A value of "0" means "use the system-wide default stripe count", which
2421  * has either been inherited by now, or falls back to 1 stripe per file.
2422  * A value of "-1" (0xffffffff) means "stripe over all available OSTs",
2423  * and is a valid value, so is left unchanged here.
2424  */
2425 void lod_fix_desc_stripe_count(__u32 *val)
2426 {
2427         if (*val == 0)
2428                 *val = 1;
2429 }
2430
2431 /**
2432  * set the filesystem default layout pattern
2433  *
2434  * \param[in,out] val   LOV_PATTERN_* layout
2435  *
2436  * A value of "0" means "use the system-wide default layout type", which
2437  * has either been inherited by now, or falls back to plain RAID0 striping.
2438  */
2439 void lod_fix_desc_pattern(__u32 *val)
2440 {
2441         /* from lov_setstripe */
2442         if ((*val != 0) && !lov_pattern_supported_normal_comp(*val)) {
2443                 LCONSOLE_WARN("lod: Unknown stripe pattern: %#x\n", *val);
2444                 *val = 0;
2445         }
2446 }
2447
2448 void lod_fix_lmv_desc_pattern(__u32 *val)
2449 {
2450         if ((*val) && !lmv_is_known_hash_type(*val)) {
2451                 LCONSOLE_WARN("lod: Unknown md stripe pattern: %#x\n", *val);
2452                 *val = 0;
2453         }
2454 }
2455
2456 void lod_fix_desc_qos_maxage(__u32 *val)
2457 {
2458         /* fix qos_maxage */
2459         if (*val == 0)
2460                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
2461 }
2462
2463 /**
2464  * Used to fix insane default striping.
2465  *
2466  * \param[in] desc      striping description
2467  */
2468 void lod_fix_desc(struct lov_desc *desc)
2469 {
2470         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
2471         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2472         lod_fix_desc_pattern(&desc->ld_pattern);
2473         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2474 }
2475
2476 static void lod_fix_lmv_desc(struct lmv_desc *desc)
2477 {
2478         desc->ld_active_tgt_count = 0;
2479         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2480         lod_fix_lmv_desc_pattern(&desc->ld_pattern);
2481         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2482 }
2483
2484 /**
2485  * Initialize the structures used to store pools and default striping.
2486  *
2487  * \param[in] lod       LOD device
2488  * \param[in] lcfg      configuration structure storing default striping.
2489  *
2490  * \retval              0 if initialization succeeds
2491  * \retval              negative error number on failure
2492  */
2493 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
2494 {
2495         struct obd_device          *obd;
2496         struct lov_desc            *desc;
2497         int                         rc;
2498         ENTRY;
2499
2500         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
2501         LASSERT(obd != NULL);
2502         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
2503
2504         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
2505                 CERROR("LOD setup requires a descriptor\n");
2506                 RETURN(-EINVAL);
2507         }
2508
2509         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
2510
2511         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
2512                 CERROR("descriptor size wrong: %d > %d\n",
2513                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
2514                 RETURN(-EINVAL);
2515         }
2516
2517         if (desc->ld_magic != LOV_DESC_MAGIC) {
2518                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
2519                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
2520                                obd->obd_name, desc);
2521                         lustre_swab_lov_desc(desc);
2522                 } else {
2523                         CERROR("%s: Bad lov desc magic: %#x\n",
2524                                obd->obd_name, desc->ld_magic);
2525                         RETURN(-EINVAL);
2526                 }
2527         }
2528
2529         lod_fix_desc(desc);
2530
2531         desc->ld_active_tgt_count = 0;
2532         lod->lod_ost_descs.ltd_lov_desc = *desc;
2533
2534         /* NB: config doesn't contain lmv_desc, alter it via sysfs. */
2535         lod_fix_lmv_desc(&lod->lod_mdt_descs.ltd_lmv_desc);
2536
2537         lod->lod_sp_me = LUSTRE_SP_CLI;
2538
2539         /* Set up OST pool environment */
2540         lod->lod_pool_count = 0;
2541         rc = lod_pool_hash_init(&lod->lod_pools_hash_body);
2542         if (rc)
2543                 RETURN(-ENOMEM);
2544
2545         INIT_LIST_HEAD(&lod->lod_pool_list);
2546         lod->lod_pool_count = 0;
2547         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_tgt_pool, 0);
2548         if (rc)
2549                 GOTO(out_hash, rc);
2550
2551         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool, 0);
2552         if (rc)
2553                 GOTO(out_mdt_pool, rc);
2554
2555         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_tgt_pool, 0);
2556         if (rc)
2557                 GOTO(out_mdt_rr_pool, rc);
2558
2559         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool, 0);
2560         if (rc)
2561                 GOTO(out_ost_pool, rc);
2562
2563         RETURN(0);
2564
2565 out_ost_pool:
2566         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2567 out_mdt_rr_pool:
2568         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2569 out_mdt_pool:
2570         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2571 out_hash:
2572         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2573
2574         return rc;
2575 }
2576
2577 /**
2578  * Release the structures describing the pools.
2579  *
2580  * \param[in] lod       LOD device from which we release the structures
2581  *
2582  * \retval              0 always
2583  */
2584 int lod_pools_fini(struct lod_device *lod)
2585 {
2586         struct obd_device   *obd = lod2obd(lod);
2587         struct lod_pool_desc *pool, *tmp;
2588         ENTRY;
2589
2590         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
2591                 /* free pool structs */
2592                 CDEBUG(D_INFO, "delete pool %p\n", pool);
2593                 /* In the function below, .hs_keycmp resolves to
2594                  * pool_hashkey_keycmp() */
2595                 lod_pool_del(obd, pool->pool_name);
2596         }
2597
2598         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2599         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool);
2600         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2601         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2602         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2603
2604         RETURN(0);
2605 }