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 (lod_comp->llc_pattern == 0) /* default striping */
 757                 lod_comp->llc_pattern = LOV_PATTERN_RAID0;
 758
 759         lmm->lmm_magic = cpu_to_le32(magic);
 760         lmm->lmm_pattern = cpu_to_le32(lod_comp->llc_pattern);
 761         fid_to_lmm_oi(fid, &lmm->lmm_oi);
 762         if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
 763                 lmm->lmm_oi.oi.oi_id++;
 764         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
 765
 766         lmm->lmm_stripe_size = cpu_to_le32(lod_comp->llc_stripe_size);
 767         lmm->lmm_stripe_count = cpu_to_le16(lod_comp->llc_stripe_count);
 768         /**
 769          * for dir and uninstantiated component, lmm_layout_gen stores
 770          * default stripe offset.
 771          */
 772         lmm->lmm_layout_gen =
 773                 (is_dir || !lod_comp_inited(lod_comp)) ?
 774                         cpu_to_le16(lod_comp->llc_stripe_offset) :
 775                         cpu_to_le16(lod_comp->llc_layout_gen);
 776
 777         if (magic == LOV_MAGIC_V1) {
 778                 objs = &lmm->lmm_objects[0];
 779         } else {
 780                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
 781                 size_t cplen = strscpy(v3->lmm_pool_name,
 782                                        lod_comp->llc_pool,
 783                                        sizeof(v3->lmm_pool_name));
 784                 if (cplen < 0)
 785                         RETURN(cplen);
 786                 objs = &v3->lmm_objects[0];
 787         }
 788         lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 789         stripe_count = lod_comp_entry_stripe_count(lo, comp_idx, is_dir);
 790         if (stripe_count == 0 && !is_dir &&
 791             !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
 792             !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
 793                 /* Try again if all active targets are disconnected.
 794                  * It is possible when MDS does failover. */
 795                 if (!lod->lod_ost_active_count &&
 796                     lod->lod_ost_count)
 797                         RETURN(-EAGAIN);
 798                 RETURN(-E2BIG);
 799         }
 800
 801         if (!is_dir && lo->ldo_is_composite)
 802                 lod_comp_shrink_stripe_count(lod_comp, &stripe_count);
 803
 804         if (is_dir || lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED)
 805                 GOTO(done, rc = 0);
 806
 807         /* generate ost_idx of this component stripe */
 808         for (i = 0; i < stripe_count; i++) {
 809                 struct dt_object *object;
 810                 __u32 ost_idx = (__u32)-1UL;
 811                 int type = LU_SEQ_RANGE_OST;
 812
 813                 if (lod_comp->llc_stripe && lod_comp->llc_stripe[i]) {
 814                         object = lod_comp->llc_stripe[i];
 815                         /* instantiated component */
 816                         info->lti_fid = *lu_object_fid(&object->do_lu);
 817
 818                         if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF) &&
 819                             comp_idx == 0) {
 820                                 if (cfs_fail_val == 0)
 821                                         cfs_fail_val = info->lti_fid.f_oid;
 822                                 else if (i == 0)
 823                                         info->lti_fid.f_oid = cfs_fail_val;
 824                         }
 825
 826                         rc = fid_to_ostid(&info->lti_fid, &info->lti_ostid);
 827                         LASSERT(rc == 0);
 828
 829                         ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 830                         objs[i].l_ost_gen = cpu_to_le32(0);
 831                         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_FLD_LOOKUP))
 832                                 rc = -ENOENT;
 833                         else
 834                                 rc = lod_fld_lookup(env, lod, &info->lti_fid,
 835                                                     &ost_idx, &type);
 836                         if (rc < 0) {
 837                                 CERROR("%s: Can not locate "DFID": rc = %d\n",
 838                                        lod2obd(lod)->obd_name,
 839                                        PFID(&info->lti_fid), rc);
 840                                 RETURN(rc);
 841                         }
 842                 } else if (lod_comp->llc_ostlist.op_array &&
 843                            lod_comp->llc_ostlist.op_count) {
 844                         /* user specified ost list */
 845                         ost_idx = lod_comp->llc_ostlist.op_array[i];
 846                 }
 847                 /*
 848                  * with un-instantiated or with no specified ost list
 849                  * component, its l_ost_idx does not matter.
 850                  */
 851                 objs[i].l_ost_idx = cpu_to_le32(ost_idx);
 852
 853                 /* simulation of broken LOVEA */
 854                 if (CFS_FAIL_CHECK(OBD_FAIL_LOV_INVALID_OSTIDX) &&
 855                     comp_idx == 0 && i == 0 && lo->ldo_mirror_count > 1) {
 856                         objs[i].l_ost_idx = cpu_to_le32(0xffffffff);
 857                 }
 858
 859         }
 860 done:
 861         if (lmm_size != NULL)
 862                 *lmm_size = lov_mds_md_size(stripe_count, magic);
 863         RETURN(rc);
 864 }
 865
 866 /**
 867  * Generate on-disk lov_hsm_md structure based on the information in
 868  * the lod_object->ldo_comp_entries.
 869  */
 870 static int lod_gen_component_ea_foreign(const struct lu_env *env,
 871                                         struct lod_object *lo,
 872                                         struct lod_layout_component *lod_comp,
 873                                         void *lmm, int *lmm_size)
 874 {
 875         struct lov_foreign_md *lfm = (struct lov_foreign_md *)lmm;
 876
 877         ENTRY;
 878
 879         lfm->lfm_magic = cpu_to_le32(LOV_MAGIC_FOREIGN);
 880         lfm->lfm_length = cpu_to_le32(lod_comp->llc_length);
 881         lfm->lfm_type = cpu_to_le32(lod_comp->llc_type);
 882         lfm->lfm_flags = cpu_to_le32(lod_comp->llc_foreign_flags);
 883
 884         if (lov_hsm_type_supported(lod_comp->llc_type)) {
 885                 if (lod_comp->llc_length != sizeof(struct lov_hsm_base))
 886                         return -EINVAL;
 887
 888                 lov_foreign_hsm_to_le(lfm, &lod_comp->llc_hsm);
 889         }
 890
 891         if (lmm_size)
 892                 *lmm_size = lov_foreign_md_size(lod_comp->llc_length);
 893
 894         RETURN(0);
 895 }
 896
 897 /**
 898  * Generate on-disk lov_mds_md structure based on the information in
 899  * the lod_object->ldo_comp_entries.
 900  *
 901  * \param[in] env               execution environment for this thread
 902  * \param[in] lo                LOD object
 903  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 904  * \param[in|out] lmm_size      buffer size/lmm size
 905  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 906  *                              the stripe info is from the default stripe
 907  *                              template, which is collected in lod_ah_init(),
 908  *                              either from parent object or root object; for
 909  *                              file case, it's from the @lo object
 910  *
 911  * \retval                      0 if on disk structure is created successfully
 912  * \retval                      negative error number on failure
 913  */
 914 int lod_generate_lovea(const struct lu_env *env, struct lod_object *lo,
 915                        struct lov_mds_md *lmm, int *lmm_size, bool is_dir)
 916 {
 917         struct lov_comp_md_entry_v1 *lcme;
 918         struct lov_comp_md_v1 *lcm;
 919         struct lod_layout_component *comp_entries;
 920         __u16 comp_cnt, mirror_cnt;
 921         bool is_composite, is_foreign = false;
 922         int i, rc = 0, offset;
 923         ENTRY;
 924
 925         if (is_dir) {
 926                 comp_cnt = lo->ldo_def_striping->lds_def_comp_cnt;
 927                 mirror_cnt = lo->ldo_def_striping->lds_def_mirror_cnt;
 928                 comp_entries = lo->ldo_def_striping->lds_def_comp_entries;
 929                 is_composite =
 930                         lo->ldo_def_striping->lds_def_striping_is_composite;
 931         } else {
 932                 comp_cnt = lo->ldo_comp_cnt;
 933                 mirror_cnt = lo->ldo_mirror_count;
 934                 comp_entries = lo->ldo_comp_entries;
 935                 is_composite = lo->ldo_is_composite;
 936                 is_foreign = lo->ldo_is_foreign;
 937         }
 938
 939         LASSERT(lmm_size != NULL);
 940
 941         if (is_foreign) {
 942                 struct lov_foreign_md *lfm;
 943
 944                 lfm = (struct lov_foreign_md *)lmm;
 945                 memcpy(lfm, lo->ldo_foreign_lov, lo->ldo_foreign_lov_size);
 946                 /* need to store little-endian */
 947                 if (cpu_to_le32(LOV_MAGIC_FOREIGN) != LOV_MAGIC_FOREIGN) {
 948                         __swab32s(&lfm->lfm_magic);
 949                         __swab32s(&lfm->lfm_length);
 950                         __swab32s(&lfm->lfm_type);
 951                         __swab32s(&lfm->lfm_flags);
 952                 }
 953                 *lmm_size = lo->ldo_foreign_lov_size;
 954                 RETURN(0);
 955         }
 956
 957         LASSERT(comp_cnt != 0 && comp_entries != NULL);
 958
 959         if (!is_composite) {
 960                 rc = lod_gen_component_ea(env, lo, 0, lmm, lmm_size, is_dir);
 961                 RETURN(rc);
 962         }
 963
 964         lcm = (struct lov_comp_md_v1 *)lmm;
 965         memset(lcm, 0, sizeof(*lcm));
 966
 967         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_COMP_V1);
 968         lcm->lcm_entry_count = cpu_to_le16(comp_cnt);
 969         lcm->lcm_mirror_count = cpu_to_le16(mirror_cnt - 1);
 970         if (mirror_cnt > 1)
 971                 lcm->lcm_flags = cpu_to_le16(lo->ldo_flr_state);
 972         else
 973                 lcm->lcm_flags = LCM_FL_NONE;
 974
 975         offset = sizeof(*lcm) + sizeof(*lcme) * comp_cnt;
 976         LASSERT(offset % sizeof(__u64) == 0);
 977
 978         for (i = 0; i < comp_cnt; i++) {
 979                 struct lod_layout_component *lod_comp;
 980                 struct lov_mds_md *sub_md;
 981                 int size;
 982
 983                 lod_comp = &comp_entries[i];
 984                 lcme = &lcm->lcm_entries[i];
 985
 986                 LASSERT(ergo(!is_dir, lod_comp->llc_id != LCME_ID_INVAL));
 987                 lcme->lcme_id = cpu_to_le32(lod_comp->llc_id);
 988
 989                 /* component could be un-inistantiated */
 990                 lcme->lcme_flags = cpu_to_le32(lod_comp->llc_flags);
 991                 if (lod_comp->llc_flags & LCME_FL_NOSYNC)
 992                         lcme->lcme_timestamp =
 993                                 cpu_to_le64(lod_comp->llc_timestamp);
 994                 if (lod_comp->llc_flags & LCME_FL_EXTENSION && !is_dir)
 995                         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_SEL);
 996
 997                 lcme->lcme_extent.e_start =
 998                         cpu_to_le64(lod_comp->llc_extent.e_start);
 999                 lcme->lcme_extent.e_end =
1000                         cpu_to_le64(lod_comp->llc_extent.e_end);
1001                 lcme->lcme_offset = cpu_to_le32(offset);
1002
1003                 sub_md = (struct lov_mds_md *)((char *)lcm + offset);
1004                 if (lod_comp->llc_magic == LOV_MAGIC_FOREIGN) {
1005                         if (!lov_hsm_type_supported(lod_comp->llc_type)) {
1006                                 CDEBUG(D_LAYOUT, "Unknown HSM type: %u\n",
1007                                        lod_comp->llc_type);
1008                                 GOTO(out, rc = -EINVAL);
1009                         }
1010                         rc = lod_gen_component_ea_foreign(env, lo, lod_comp,
1011                                                           sub_md, &size);
1012                 } else {
1013                         rc = lod_gen_component_ea(env, lo, i, sub_md,
1014                                                   &size, is_dir);
1015                 }
1016                 if (rc)
1017                         GOTO(out, rc);
1018                 lcme->lcme_size = cpu_to_le32(size);
1019                 offset += size;
1020                 LASSERTF((offset <= *lmm_size) && (offset % sizeof(__u64) == 0),
1021                          "offset:%d lmm_size:%d\n", offset, *lmm_size);
1022         }
1023         lcm->lcm_size = cpu_to_le32(offset);
1024         lcm->lcm_layout_gen = cpu_to_le32(is_dir ? 0 : lo->ldo_layout_gen);
1025
1026         lustre_print_user_md(D_LAYOUT, (struct lov_user_md *)lmm,
1027                              "generate lum");
1028 out:
1029         if (rc == 0)
1030                 *lmm_size = offset;
1031         RETURN(rc);
1032 }
1033
1034 /**
1035  * Get LOV EA.
1036  *
1037  * Fill lti_ea_store buffer in the environment with a value for the given
1038  * EA. The buffer is reallocated if the value doesn't fit.
1039  *
1040  * \param[in,out] env           execution environment for this thread
1041  *                              .lti_ea_store buffer is filled with EA's value
1042  * \param[in] lo                LOD object
1043  * \param[in] name              name of the EA
1044  *
1045  * \retval                      > 0 if EA is fetched successfully
1046  * \retval                      0 if EA is empty
1047  * \retval                      negative error number on failure
1048  */
1049 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
1050                const char *name)
1051 {
1052         struct lod_thread_info  *info = lod_env_info(env);
1053         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
1054         int rc, count = 0;
1055         ENTRY;
1056
1057         LASSERT(info);
1058
1059         if (unlikely(info->lti_ea_store == NULL)) {
1060                 /* just to enter in allocation block below */
1061                 rc = -ERANGE;
1062         } else {
1063 repeat:
1064                 info->lti_buf.lb_buf = info->lti_ea_store;
1065                 info->lti_buf.lb_len = info->lti_ea_store_size;
1066                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
1067         }
1068
1069         /* if object is not striped or inaccessible */
1070         if (rc == -ENODATA || rc == -ENOENT)
1071                 RETURN(0);
1072
1073         if (rc == -ERANGE) {
1074                 /* EA doesn't fit, reallocate new buffer */
1075                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
1076                 if (rc == -ENODATA || rc == -ENOENT)
1077                         RETURN(0);
1078                 else if (rc < 0)
1079                         RETURN(rc);
1080
1081                 LASSERT(rc > 0);
1082                 if (rc <= info->lti_ea_store_size) {
1083                         /* sometimes LOVEA can shrink in parallel */
1084                         LASSERT(count++ < 10);
1085                         goto repeat;
1086                 }
1087                 rc = lod_ea_store_resize(info, rc);
1088                 if (rc)
1089                         RETURN(rc);
1090                 goto repeat;
1091         }
1092
1093         RETURN(rc);
1094 }
1095
1096 /**
1097  * Verify the target index is present in the current configuration.
1098  *
1099  * \param[in] md                LOD device where the target table is stored
1100  * \param[in] idx               target's index
1101  *
1102  * \retval                      0 if the index is present
1103  * \retval                      -EINVAL if not
1104  */
1105 int validate_lod_and_idx(struct lod_device *md, __u32 idx)
1106 {
1107         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
1108                      !test_bit(idx, md->lod_ost_bitmap))) {
1109                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
1110                        md->lod_ost_descs.ltd_tgts_size);
1111                 return -EINVAL;
1112         }
1113
1114         if (unlikely(OST_TGT(md, idx) == NULL)) {
1115                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
1116                        lod2obd(md)->obd_name, idx);
1117                 return -EINVAL;
1118         }
1119
1120         if (unlikely(OST_TGT(md, idx)->ltd_tgt == NULL)) {
1121                 CERROR("%s: invalid lod device, for idx: %d\n",
1122                        lod2obd(md)->obd_name , idx);
1123                 return -EINVAL;
1124         }
1125
1126         return 0;
1127 }
1128
1129 /**
1130  * Instantiate objects for stripes.
1131  *
1132  * Allocate and initialize LU-objects representing the stripes. The number
1133  * of the stripes (llc_stripe_count) must be initialized already. The caller
1134  * must ensure nobody else is calling the function on the object at the same
1135  * time. FLDB service must be running to be able to map a FID to the targets
1136  * and find appropriate device representing that target.
1137  *
1138  * \param[in] env               execution environment for this thread
1139  * \param[in,out] lo            LOD object
1140  * \param[in] objs              an array of IDs to creates the objects from
1141  * \param[in] comp_idx          index of ldo_comp_entries
1142  *
1143  * \retval                      0 if the objects are instantiated successfully
1144  * \retval                      negative error number on failure
1145  */
1146 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
1147                            struct lov_ost_data_v1 *objs, int comp_idx)
1148 {
1149         struct lod_layout_component *lod_comp;
1150         struct lod_thread_info *info = lod_env_info(env);
1151         struct lod_device *md;
1152         struct lu_object *o, *n;
1153         struct lu_device *nd;
1154         struct dt_object **stripe = NULL;
1155         __u32 *ost_indices = NULL;
1156         int stripe_len;
1157         int i, rc = 0;
1158         __u32 idx;
1159         ENTRY;
1160
1161         LASSERT(lo != NULL);
1162         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1163
1164         LASSERT(lo->ldo_comp_cnt != 0 && lo->ldo_comp_entries != NULL);
1165         lod_comp = &lo->ldo_comp_entries[comp_idx];
1166
1167         LASSERT(lod_comp->llc_stripe == NULL);
1168         LASSERT(lod_comp->llc_stripe_count > 0);
1169         LASSERT(lod_comp->llc_stripe_size > 0);
1170
1171         stripe_len = lod_comp->llc_stripe_count;
1172         OBD_ALLOC_PTR_ARRAY(stripe, stripe_len);
1173         if (stripe == NULL)
1174                 RETURN(-ENOMEM);
1175         OBD_ALLOC_PTR_ARRAY(ost_indices, stripe_len);
1176         if (!ost_indices)
1177                 GOTO(out, rc = -ENOMEM);
1178
1179         for (i = 0; i < lod_comp->llc_stripe_count; i++) {
1180                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
1181                         continue;
1182
1183                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
1184                 idx = le32_to_cpu(objs[i].l_ost_idx);
1185                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
1186                 if (rc != 0)
1187                         GOTO(out, rc);
1188                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
1189                          PFID(&info->lti_fid));
1190                 lod_getref(&md->lod_ost_descs);
1191
1192                 rc = validate_lod_and_idx(md, idx);
1193                 if (unlikely(rc != 0)) {
1194                         lod_putref(md, &md->lod_ost_descs);
1195                         GOTO(out, rc);
1196                 }
1197
1198                 nd = &OST_TGT(md, idx)->ltd_tgt->dd_lu_dev;
1199                 lod_putref(md, &md->lod_ost_descs);
1200
1201                 /* In the function below, .hs_keycmp resolves to
1202                  * u_obj_hop_keycmp() */
1203                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
1204                 if (IS_ERR(o))
1205                         GOTO(out, rc = PTR_ERR(o));
1206
1207                 n = lu_object_locate(o->lo_header, nd->ld_type);
1208                 LASSERT(n);
1209
1210                 stripe[i] = container_of(n, struct dt_object, do_lu);
1211                 ost_indices[i] = idx;
1212         }
1213
1214 out:
1215         if (rc != 0) {
1216                 for (i = 0; i < stripe_len; i++)
1217                         if (stripe[i] != NULL)
1218                                 dt_object_put(env, stripe[i]);
1219
1220                 OBD_FREE_PTR_ARRAY(stripe, stripe_len);
1221                 lod_comp->llc_stripe_count = 0;
1222                 if (ost_indices)
1223                         OBD_FREE_PTR_ARRAY(ost_indices, stripe_len);
1224         } else {
1225                 lod_comp->llc_stripe = stripe;
1226                 lod_comp->llc_ost_indices = ost_indices;
1227                 lod_comp->llc_stripes_allocated = stripe_len;
1228         }
1229
1230         RETURN(rc);
1231 }
1232
1233 int lod_init_comp_foreign(struct lod_layout_component *lod_comp, void *lmm)
1234 {
1235         struct lov_foreign_md *lfm;
1236
1237         lfm = (struct lov_foreign_md *)lmm;
1238         lod_comp->llc_length = le32_to_cpu(lfm->lfm_length);
1239         lod_comp->llc_type = le32_to_cpu(lfm->lfm_type);
1240
1241         if (!lov_hsm_type_supported(lod_comp->llc_type)) {
1242                 CDEBUG(D_LAYOUT,
1243                        "Unsupport HSM type: %u length: %u flags: %08X\n",
1244                        lod_comp->llc_type, lod_comp->llc_length,
1245                        le32_to_cpu(lfm->lfm_flags));
1246                 return -EINVAL;
1247         }
1248
1249         /*
1250          * Currently it only stores the file FID as the field @lhm_archive_uuid
1251          * which is used to be the identifier within HSM backend for the archive
1252          * copy.
1253          * Thus the length of foreign layout value (HSM is a kind of foreign
1254          * layout type) is: sizeof(lhm_archive_id) + sizeof(lhm_archive_ver) +
1255          *                  UUID_MAX
1256          * It should fix to support other kinds of identifier for different HSM
1257          * solutions such as S3.
1258          */
1259         if (lod_comp->llc_length != sizeof(struct lov_hsm_base)) {
1260                 CDEBUG(D_LAYOUT, "Invalid HSM len: %u, should be %zu\n",
1261                        lod_comp->llc_length, sizeof(struct lov_hsm_base));
1262                 return -EINVAL;
1263         }
1264
1265         lod_comp->llc_foreign_flags = le32_to_cpu(lfm->lfm_flags);
1266         lov_foreign_hsm_to_cpu(&lod_comp->llc_hsm, lfm);
1267         return 0;
1268 }
1269
1270 /**
1271  * Instantiate objects for striping.
1272  *
1273  * Parse striping information in \a buf and instantiate the objects
1274  * representing the stripes.
1275  *
1276  * \param[in] env               execution environment for this thread
1277  * \param[in] lo                LOD object
1278  * \param[in] buf               buffer storing LOV EA to parse
1279  * \param[in] lvf               verify flags when parsing the layout
1280  *
1281  * \retval                      0 if parsing and objects creation succeed
1282  * \retval                      negative error number on failure
1283  */
1284 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
1285                        const struct lu_buf *buf, enum layout_verify_flags lvf)
1286 {
1287         struct lod_device *d = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1288         struct lov_mds_md_v1 *lmm;
1289         struct lov_comp_md_v1 *comp_v1 = NULL;
1290         struct lov_foreign_md *foreign = NULL;
1291         struct lov_ost_data_v1 *objs;
1292         __u32 magic, pattern;
1293         __u16 mirror_cnt = 0;
1294         __u16 comp_cnt;
1295         __u64 dom_size = 0;
1296         int i, rc;
1297         __u16 mirror_id = MIRROR_ID_NEG;
1298         bool stale = false;
1299         int stale_mirrors = 0;
1300         ENTRY;
1301
1302         LASSERT(buf);
1303         LASSERT(buf->lb_buf);
1304         LASSERT(buf->lb_len);
1305         LASSERT(mutex_is_locked(&lo->ldo_layout_mutex));
1306
1307         lmm = (struct lov_mds_md_v1 *)buf->lb_buf;
1308         magic = le32_to_cpu(lmm->lmm_magic);
1309
1310         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3 &&
1311             magic != LOV_MAGIC_COMP_V1 && magic != LOV_MAGIC_FOREIGN &&
1312             magic != LOV_MAGIC_SEL)
1313                 GOTO(out, rc = -EINVAL);
1314
1315         lod_striping_free_nolock(env, lo);
1316
1317         if (magic == LOV_MAGIC_COMP_V1 || magic == LOV_MAGIC_SEL) {
1318                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
1319                 comp_cnt = le16_to_cpu(comp_v1->lcm_entry_count);
1320                 if (comp_cnt == 0)
1321                         GOTO(out, rc = -EINVAL);
1322
1323                 lo->ldo_layout_gen = le32_to_cpu(comp_v1->lcm_layout_gen);
1324                 lo->ldo_is_composite = 1;
1325                 mirror_cnt = le16_to_cpu(comp_v1->lcm_mirror_count) + 1;
1326                 if (mirror_cnt > 1)
1327                         lo->ldo_flr_state = le16_to_cpu(comp_v1->lcm_flags) &
1328                                                         LCM_FL_FLR_MASK;
1329                 else
1330                         lo->ldo_flr_state = LCM_FL_NONE;
1331         } else if (magic == LOV_MAGIC_FOREIGN) {
1332                 size_t length;
1333
1334                 foreign = (struct lov_foreign_md *)buf->lb_buf;
1335                 length = offsetof(typeof(*foreign), lfm_value);
1336                 if (buf->lb_len < length ||
1337                     buf->lb_len < (length + le32_to_cpu(foreign->lfm_length))) {
1338                         CDEBUG(D_LAYOUT,
1339                                "buf len %zu too small for lov_foreign_md\n",
1340                                buf->lb_len);
1341                         GOTO(out, rc = -EINVAL);
1342                 }
1343
1344                 /* just cache foreign LOV EA raw */
1345                 rc = lod_alloc_foreign_lov(lo, length);
1346                 if (rc)
1347                         GOTO(out, rc);
1348                 memcpy(lo->ldo_foreign_lov, buf->lb_buf, length);
1349                 GOTO(out, rc);
1350         } else {
1351                 comp_cnt = 1;
1352                 lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1353                 lo->ldo_is_composite = 0;
1354         }
1355
1356         rc = lod_alloc_comp_entries(lo, mirror_cnt, comp_cnt);
1357         if (rc)
1358                 GOTO(out, rc);
1359
1360         for (i = 0; i < comp_cnt; i++) {
1361                 struct lod_layout_component *lod_comp;
1362                 struct lu_extent *ext;
1363                 __u32 offs;
1364
1365                 lod_comp = &lo->ldo_comp_entries[i];
1366                 if (lo->ldo_is_composite) {
1367                         offs = le32_to_cpu(comp_v1->lcm_entries[i].lcme_offset);
1368                         lmm = (struct lov_mds_md_v1 *)((char *)comp_v1 + offs);
1369
1370                         ext = &comp_v1->lcm_entries[i].lcme_extent;
1371                         lod_comp->llc_extent.e_start =
1372                                 le64_to_cpu(ext->e_start);
1373                         if (lod_comp->llc_extent.e_start &
1374                             (LOV_MIN_STRIPE_SIZE - 1)) {
1375                                 CDEBUG(D_LAYOUT,
1376                                        "extent start %llu is not a multiple of min size %u\n",
1377                                        lod_comp->llc_extent.e_start,
1378                                        LOV_MIN_STRIPE_SIZE);
1379                                 GOTO(out, rc = -EINVAL);
1380                         }
1381
1382                         lod_comp->llc_extent.e_end = le64_to_cpu(ext->e_end);
1383                         if (lod_comp->llc_extent.e_end != LUSTRE_EOF &&
1384                             lod_comp->llc_extent.e_end &
1385                             (LOV_MIN_STRIPE_SIZE - 1)) {
1386                                 CDEBUG(D_LAYOUT,
1387                                        "extent end %llu is not a multiple of min size %u\n",
1388                                        lod_comp->llc_extent.e_end,
1389                                        LOV_MIN_STRIPE_SIZE);
1390                                 GOTO(out, rc = -EINVAL);
1391                         }
1392
1393                         lod_comp->llc_flags =
1394                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_flags);
1395
1396                         if (lod_comp->llc_flags & LCME_FL_NOSYNC)
1397                                 lod_comp->llc_timestamp = le64_to_cpu(
1398                                         comp_v1->lcm_entries[i].lcme_timestamp);
1399                         lod_comp->llc_id =
1400                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_id);
1401                         if (lod_comp->llc_id == LCME_ID_INVAL)
1402                                 GOTO(out, rc = -EINVAL);
1403
1404                         if (lvf & LVF_ALL_STALE) {
1405                                 if (mirror_id_of(lod_comp->llc_id) ==
1406                                     mirror_id) {
1407                                         /* remaining comps in the mirror */
1408                                         stale |= lod_comp->llc_flags &
1409                                                  LCME_FL_STALE;
1410                                 } else {
1411                                         /*
1412                                          * new mirror, check last mirror's
1413                                          * stale-ness
1414                                          */
1415                                         if (stale)
1416                                                 stale_mirrors++;
1417
1418                                         mirror_id =
1419                                                 mirror_id_of(lod_comp->llc_id);
1420
1421                                         /* the first comp of the new mirror */
1422                                         stale = lod_comp->llc_flags &
1423                                                 LCME_FL_STALE;
1424                                 }
1425                         }
1426
1427                         if ((lod_comp->llc_flags & LCME_FL_EXTENSION) &&
1428                             comp_v1->lcm_magic != cpu_to_le32(LOV_MAGIC_SEL)) {
1429                                 CWARN("%s: EXTENSION flags=%x set on component[%u]=%x of non-SEL file "DFID" with magic=%#08x\n",
1430                                       lod2obd(d)->obd_name,
1431                                       lod_comp->llc_flags, lod_comp->llc_id, i,
1432                                       PFID(lod_object_fid(lo)),
1433                                       le32_to_cpu(comp_v1->lcm_magic));
1434                         }
1435
1436                         lod_comp->llc_magic = le32_to_cpu(lmm->lmm_magic);
1437                         if (lod_comp->llc_magic == LOV_MAGIC_FOREIGN) {
1438                                 rc = lod_init_comp_foreign(lod_comp, lmm);
1439                                 if (rc)
1440                                         GOTO(out, rc);
1441                                 continue;
1442                         }
1443                 } else {
1444                         lod_comp->llc_magic = le32_to_cpu(lmm->lmm_magic);
1445                         lod_comp_set_init(lod_comp);
1446                 }
1447
1448                 pattern = le32_to_cpu(lmm->lmm_pattern);
1449                 if (!lov_pattern_supported(lov_pattern(pattern)))
1450                         GOTO(out, rc = -EINVAL);
1451
1452                 if (pattern & LOV_PATTERN_MDT) {
1453                         if (lod_comp->llc_extent.e_start != 0) {
1454                                 CERROR("%s: DOM entry must be the first stripe "
1455                                        "in a mirror\n", lod2obd(d)->obd_name);
1456                                 GOTO(out, rc = -EINVAL);
1457                         }
1458                         if (!dom_size) {
1459                                 dom_size = lod_comp->llc_extent.e_end;
1460                         } else if (dom_size != lod_comp->llc_extent.e_end) {
1461                                 CERROR("%s: DOM entries with different sizes "
1462                                        "%#llx/%#llx\n", lod2obd(d)->obd_name,
1463                                        dom_size, lod_comp->llc_extent.e_end);
1464                                 GOTO(out, rc = -EINVAL);
1465                         }
1466                 }
1467
1468                 lod_comp->llc_pattern = pattern;
1469                 lod_comp->llc_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
1470                 lod_comp->llc_stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
1471                 lod_comp->llc_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1472
1473                 if (lmm->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)) {
1474                         struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
1475
1476                         lod_set_pool(&lod_comp->llc_pool, v3->lmm_pool_name);
1477                         objs = &v3->lmm_objects[0];
1478                 } else {
1479                         lod_set_pool(&lod_comp->llc_pool, NULL);
1480                         objs = &lmm->lmm_objects[0];
1481                 }
1482
1483                 /**
1484                  * If uninstantiated template component has valid l_ost_idx,
1485                  * then user has specified ost list for this component.
1486                  */
1487                 if (!lod_comp_inited(lod_comp)) {
1488                         __u16 stripe_count;
1489
1490                         if (objs[0].l_ost_idx != (__u32)-1UL) {
1491                                 int j;
1492
1493                                 stripe_count = lod_comp_entry_stripe_count(
1494                                                         lo, i, false);
1495                                 if (stripe_count == 0 &&
1496                                     !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1497                                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT))
1498                                         GOTO(out, rc = -E2BIG);
1499                                 /**
1500                                  * load the user specified ost list, when this
1501                                  * component is instantiated later, it will be
1502                                  * used in lod_alloc_ost_list().
1503                                  */
1504                                 lod_comp->llc_ostlist.op_count = stripe_count;
1505                                 lod_comp->llc_ostlist.op_size =
1506                                         stripe_count * sizeof(__u32);
1507                                 OBD_ALLOC(lod_comp->llc_ostlist.op_array,
1508                                           lod_comp->llc_ostlist.op_size);
1509                                 if (!lod_comp->llc_ostlist.op_array)
1510                                         GOTO(out, rc = -ENOMEM);
1511
1512                                 for (j = 0; j < stripe_count; j++)
1513                                         lod_comp->llc_ostlist.op_array[j] =
1514                                                 le32_to_cpu(objs[j].l_ost_idx);
1515
1516                                 /**
1517                                  * this component OST objects starts from the
1518                                  * first ost_idx, lod_alloc_ost_list() will
1519                                  * check this.
1520                                  */
1521                                 lod_comp->llc_stripe_offset = objs[0].l_ost_idx;
1522                         } else {
1523                                 /**
1524                                  * for uninstantiated component,
1525                                  * lmm_layout_gen stores default stripe offset.
1526                                  */
1527                                 lod_comp->llc_stripe_offset =
1528                                                         lmm->lmm_layout_gen;
1529                         }
1530                 }
1531
1532                 /* skip un-instantiated component object initialization */
1533                 if (!lod_comp_inited(lod_comp))
1534                         continue;
1535
1536                 if (!(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1537                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
1538                         rc = lod_initialize_objects(env, lo, objs, i);
1539                         if (rc)
1540                                 GOTO(out, rc);
1541                 }
1542         }
1543
1544         if (lo->ldo_is_composite && (lvf & LVF_ALL_STALE)) {
1545                 /* check the last mirror stale-ness */
1546                 if (stale)
1547                         stale_mirrors++;
1548
1549                 if (mirror_cnt == stale_mirrors) {
1550                         rc = -EPERM;
1551                         CERROR("%s: can not set all stale mirrors for "
1552                                DFID": rc = %d\n",
1553                                lod2obd(d)->obd_name, PFID(lod_object_fid(lo)),
1554                                rc);
1555                         GOTO(out, rc);
1556                 }
1557         }
1558
1559         rc = lod_fill_mirrors(lo);
1560         if (rc)
1561                 GOTO(out, rc);
1562
1563 out:
1564         if (rc)
1565                 lod_striping_free_nolock(env, lo);
1566         RETURN(rc);
1567 }
1568
1569 /**
1570  * Check whether the striping (LOVEA for regular file, LMVEA for directory)
1571  * is already cached.
1572  *
1573  * \param[in] lo        LOD object
1574  *
1575  * \retval              True if the striping is cached, otherwise
1576  *                      return false.
1577  */
1578 static bool lod_striping_loaded(struct lod_object *lo)
1579 {
1580         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1581             lo->ldo_comp_cached)
1582                 return true;
1583
1584         if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1585                 if (lo->ldo_dir_stripe_loaded)
1586                         return true;
1587
1588                 /* Never load LMV stripe for slaves of striped dir */
1589                 if (lo->ldo_dir_slave_stripe)
1590                         return true;
1591         }
1592
1593         return false;
1594 }
1595
1596 /**
1597  * A generic function to initialize the stripe objects.
1598  *
1599  * A protected version of lod_striping_load_locked() - load the striping
1600  * information from storage, parse that and instantiate LU objects to
1601  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1602  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1603  * return an array of references to the newly instantiated objects.
1604  *
1605  * \param[in] env               execution environment for this thread
1606  * \param[in,out] lo            LOD object, where striping is stored and
1607  *                              which gets an array of references
1608  *
1609  * \retval                      0 if parsing and object creation succeed
1610  * \retval                      negative error number on failure
1611  **/
1612 int lod_striping_load(const struct lu_env *env, struct lod_object *lo)
1613 {
1614         struct lod_thread_info *info = lod_env_info(env);
1615         struct dt_object *next = dt_object_child(&lo->ldo_obj);
1616         struct lu_buf *buf = &info->lti_buf;
1617         int rc = 0;
1618
1619         ENTRY;
1620
1621         if (!dt_object_exists(next))
1622                 RETURN(0);
1623
1624         if (lod_striping_loaded(lo))
1625                 RETURN(0);
1626
1627         mutex_lock(&lo->ldo_layout_mutex);
1628         if (lod_striping_loaded(lo))
1629                 GOTO(unlock, rc = 0);
1630
1631         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr)) {
1632                 rc = lod_get_lov_ea(env, lo);
1633                 if (rc <= 0)
1634                         GOTO(unlock, rc);
1635
1636                 /*
1637                  * there is LOV EA (striping information) in this object
1638                  * let's parse it and create in-core objects for the stripes
1639                  */
1640                 buf->lb_buf = info->lti_ea_store;
1641                 buf->lb_len = info->lti_ea_store_size;
1642                 rc = lod_parse_striping(env, lo, buf, 0);
1643                 if (rc == 0)
1644                         lo->ldo_comp_cached = 1;
1645         } else if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1646                 rc = lod_get_lmv_ea(env, lo);
1647
1648                 if (rc > (int)sizeof(struct lmv_foreign_md)) {
1649                         struct lmv_foreign_md *lfm = info->lti_ea_store;
1650
1651                         if (le32_to_cpu(lfm->lfm_magic) == LMV_MAGIC_FOREIGN) {
1652                                 lo->ldo_foreign_lmv = info->lti_ea_store;
1653                                 lo->ldo_foreign_lmv_size =
1654                                         info->lti_ea_store_size;
1655                                 info->lti_ea_store = NULL;
1656                                 info->lti_ea_store_size = 0;
1657
1658                                 lo->ldo_dir_stripe_loaded = 1;
1659                                 lo->ldo_is_foreign = 1;
1660                                 GOTO(unlock, rc = 0);
1661                         }
1662                 }
1663
1664                 if (rc < (int)sizeof(struct lmv_mds_md_v1)) {
1665                         /* Let's set stripe_loaded to avoid further
1666                          * stripe loading especially for non-stripe directory,
1667                          * which can hurt performance. (See LU-9840)
1668                          */
1669                         if (rc == 0)
1670                                 lo->ldo_dir_stripe_loaded = 1;
1671                         GOTO(unlock, rc = rc > 0 ? -EINVAL : rc);
1672                 }
1673                 buf->lb_buf = info->lti_ea_store;
1674                 buf->lb_len = info->lti_ea_store_size;
1675                 if (rc == sizeof(struct lmv_mds_md_v1)) {
1676                         rc = lod_load_lmv_shards(env, lo, buf, true);
1677                         if (buf->lb_buf != info->lti_ea_store) {
1678                                 OBD_FREE_LARGE(info->lti_ea_store,
1679                                                info->lti_ea_store_size);
1680                                 info->lti_ea_store = buf->lb_buf;
1681                                 info->lti_ea_store_size = buf->lb_len;
1682                         }
1683
1684                         if (rc < 0)
1685                                 GOTO(unlock, rc);
1686                 }
1687
1688                 /*
1689                  * there is LMV EA (striping information) in this object
1690                  * let's parse it and create in-core objects for the stripes
1691                  */
1692                 rc = lod_parse_dir_striping(env, lo, buf);
1693                 if (rc == 0)
1694                         lo->ldo_dir_stripe_loaded = 1;
1695         }
1696         EXIT;
1697 unlock:
1698         mutex_unlock(&lo->ldo_layout_mutex);
1699
1700         return rc;
1701 }
1702
1703 int lod_striping_reload(const struct lu_env *env, struct lod_object *lo,
1704                         const struct lu_buf *buf, enum layout_verify_flags lvf)
1705 {
1706         int rc;
1707
1708         ENTRY;
1709
1710         mutex_lock(&lo->ldo_layout_mutex);
1711         rc = lod_parse_striping(env, lo, buf, lvf);
1712         mutex_unlock(&lo->ldo_layout_mutex);
1713
1714         RETURN(rc);
1715 }
1716
1717 /**
1718  * Verify lov_user_md_v1/v3 striping.
1719  *
1720  * Check the validity of all fields including the magic, stripe size,
1721  * stripe count, stripe offset and that the pool is present.  Also check
1722  * that each target index points to an existing target. The additional
1723  * \a is_from_disk turns additional checks. In some cases zero fields
1724  * are allowed (like pattern=0).
1725  *
1726  * \param[in] d                 LOD device
1727  * \param[in] buf               buffer with LOV EA to verify
1728  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1729  *                              1 - from disk, do not allow
1730  *
1731  * \retval                      0 if the striping is valid
1732  * \retval                      -EINVAL if striping is invalid
1733  */
1734 static int lod_verify_v1v3(struct lod_device *d, const struct lu_buf *buf,
1735                            bool is_from_disk)
1736 {
1737         struct lov_user_md_v1   *lum;
1738         struct lov_user_md_v3   *lum3;
1739         struct lod_pool_desc    *pool = NULL;
1740         __u32                    magic;
1741         __u32                    stripe_size;
1742         __u16                    stripe_count;
1743         __u16                    stripe_offset;
1744         size_t                   lum_size;
1745         int                      rc = 0;
1746         ENTRY;
1747
1748         lum = buf->lb_buf;
1749
1750         if (buf->lb_len < sizeof(*lum)) {
1751                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1752                        buf->lb_len);
1753                 GOTO(out, rc = -EINVAL);
1754         }
1755
1756         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1757         if (magic != LOV_USER_MAGIC_V1 &&
1758             magic != LOV_USER_MAGIC_V3 &&
1759             magic != LOV_USER_MAGIC_SPECIFIC) {
1760                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1761                        le32_to_cpu(lum->lmm_magic));
1762                 GOTO(out, rc = -EINVAL);
1763         }
1764
1765         /* the user uses "0" for default stripe pattern normally. */
1766         if (!is_from_disk && lum->lmm_pattern == LOV_PATTERN_NONE)
1767                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1768
1769         if (!lov_pattern_supported(le32_to_cpu(lum->lmm_pattern))) {
1770                 CDEBUG(D_LAYOUT, "bad userland stripe pattern: %#x\n",
1771                        le32_to_cpu(lum->lmm_pattern));
1772                 GOTO(out, rc = -EINVAL);
1773         }
1774
1775         /* a released lum comes from creating orphan on hsm release,
1776          * doesn't make sense to verify it. */
1777         if (le32_to_cpu(lum->lmm_pattern) & LOV_PATTERN_F_RELEASED)
1778                 GOTO(out, rc = 0);
1779
1780         /* 64kB is the largest common page size we see (ia64), and matches the
1781          * check in lfs */
1782         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1783         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1784                 CDEBUG(D_LAYOUT, "stripe size %u not a multiple of %u\n",
1785                        stripe_size, LOV_MIN_STRIPE_SIZE);
1786                 GOTO(out, rc = -EINVAL);
1787         }
1788
1789         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1790         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT &&
1791             !(lov_pattern(le32_to_cpu(lum->lmm_pattern)) & LOV_PATTERN_MDT)) {
1792                 /* if offset is not within valid range [0, osts_size) */
1793                 if (stripe_offset >= d->lod_ost_descs.ltd_tgts_size) {
1794                         CDEBUG(D_LAYOUT, "stripe offset %u >= bitmap size %u\n",
1795                                stripe_offset, d->lod_ost_descs.ltd_tgts_size);
1796                         GOTO(out, rc = -EINVAL);
1797                 }
1798
1799                 /* if lmm_stripe_offset is *not* in bitmap */
1800                 if (!test_bit(stripe_offset, d->lod_ost_bitmap)) {
1801                         CDEBUG(D_LAYOUT, "stripe offset %u not in bitmap\n",
1802                                stripe_offset);
1803                         GOTO(out, rc = -EINVAL);
1804                 }
1805         }
1806
1807         if (magic == LOV_USER_MAGIC_V1)
1808                 lum_size = offsetof(struct lov_user_md_v1,
1809                                     lmm_objects[0]);
1810         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC)
1811                 lum_size = offsetof(struct lov_user_md_v3,
1812                                     lmm_objects[0]);
1813         else
1814                 GOTO(out, rc = -EINVAL);
1815
1816         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1817         if (buf->lb_len < lum_size) {
1818                 CDEBUG(D_LAYOUT, "invalid buf len %zu/%zu for lov_user_md with "
1819                        "magic %#x and stripe_count %u\n",
1820                        buf->lb_len, lum_size, magic, stripe_count);
1821                 GOTO(out, rc = -EINVAL);
1822         }
1823
1824         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC))
1825                 goto out;
1826
1827         lum3 = buf->lb_buf;
1828         /* In the function below, .hs_keycmp resolves to
1829          * pool_hashkey_keycmp() */
1830         pool = lod_find_pool(d, lum3->lmm_pool_name);
1831         if (pool == NULL)
1832                 goto out;
1833
1834         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT) {
1835                 rc = lod_check_index_in_pool(stripe_offset, pool);
1836                 if (rc < 0)
1837                         GOTO(out, rc = -EINVAL);
1838         }
1839
1840         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1841                 CDEBUG(D_LAYOUT, "stripe count %u > # OSTs %u in the pool\n",
1842                        stripe_count, pool_tgt_count(pool));
1843                 GOTO(out, rc = -EINVAL);
1844         }
1845
1846 out:
1847         if (pool != NULL)
1848                 lod_pool_putref(pool);
1849
1850         RETURN(rc);
1851 }
1852
1853 static inline
1854 struct lov_comp_md_entry_v1 *comp_entry_v1(struct lov_comp_md_v1 *comp, int i)
1855 {
1856         LASSERTF((le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1857                  LOV_USER_MAGIC_COMP_V1 ||
1858                  (le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1859                  LOV_USER_MAGIC_SEL, "Wrong magic %x\n",
1860                  le32_to_cpu(comp->lcm_magic));
1861         LASSERTF(i >= 0 && i < le16_to_cpu(comp->lcm_entry_count),
1862                  "bad index %d, max = %d\n",
1863                  i, le16_to_cpu(comp->lcm_entry_count));
1864
1865         return &comp->lcm_entries[i];
1866 }
1867
1868 #define for_each_comp_entry_v1(comp, entry) \
1869         for (entry = comp_entry_v1(comp, 0); \
1870              entry <= comp_entry_v1(comp, \
1871                                    le16_to_cpu(comp->lcm_entry_count) - 1); \
1872              entry++)
1873
1874 static int lod_erase_dom_stripe(struct lov_comp_md_v1 *comp_v1,
1875                                 struct lov_comp_md_entry_v1 *dom_ent)
1876 {
1877         struct lov_comp_md_entry_v1 *ent;
1878         __u16 entries;
1879         __u32 dom_off, dom_size, comp_size, off;
1880         void *src, *dst;
1881         unsigned int size, shift;
1882
1883         entries = le16_to_cpu(comp_v1->lcm_entry_count) - 1;
1884         LASSERT(entries > 0);
1885         comp_v1->lcm_entry_count = cpu_to_le16(entries);
1886
1887         comp_size = le32_to_cpu(comp_v1->lcm_size);
1888         dom_off = le32_to_cpu(dom_ent->lcme_offset);
1889         dom_size = le32_to_cpu(dom_ent->lcme_size);
1890
1891         /* all entries offsets are shifted by entry size at least */
1892         shift = sizeof(*dom_ent);
1893         for_each_comp_entry_v1(comp_v1, ent) {
1894                 off = le32_to_cpu(ent->lcme_offset);
1895                 if (off == dom_off) {
1896                         /* Entry deletion creates two holes in layout data:
1897                          * - hole in entries array
1898                          * - hole in layout data at dom_off with dom_size
1899                          *
1900                          * First memmove is one entry shift from next entry
1901                          * start with size up to dom_off in blob
1902                          */
1903                         dst = (void *)ent;
1904                         src = (void *)(ent + 1);
1905                         size = (unsigned long)((void *)comp_v1 + dom_off - src);
1906                         memmove(dst, src, size);
1907                         /* take 'off' from just moved entry */
1908                         off = le32_to_cpu(ent->lcme_offset);
1909                         /* second memmove is blob tail after 'off' up to
1910                          * component end
1911                          */
1912                         dst = (void *)comp_v1 + dom_off - sizeof(*ent);
1913                         src = (void *)comp_v1 + off;
1914                         size = (unsigned long)(comp_size - off);
1915                         memmove(dst, src, size);
1916                         /* all entries offsets after DoM entry are shifted by
1917                          * dom_size additionally
1918                          */
1919                         shift += dom_size;
1920                 }
1921                 ent->lcme_offset = cpu_to_le32(off - shift);
1922         }
1923         comp_v1->lcm_size = cpu_to_le32(comp_size - shift);
1924
1925         /* notify a caller to re-check entry */
1926         return -ERESTART;
1927 }
1928
1929 void lod_dom_stripesize_recalc(struct lod_device *d)
1930 {
1931         __u64 threshold_mb = d->lod_dom_threshold_free_mb;
1932         __u32 max_size = d->lod_dom_stripesize_max_kb;
1933         __u32 def_size = d->lod_dom_stripesize_cur_kb;
1934
1935         /* use maximum allowed value if free space is above threshold */
1936         if (d->lod_lsfs_free_mb >= threshold_mb) {
1937                 def_size = max_size;
1938         } else if (!d->lod_lsfs_free_mb || max_size <= LOD_DOM_MIN_SIZE_KB) {
1939                 def_size = 0;
1940         } else {
1941                 /* recalc threshold like it would be with def_size as max */
1942                 threshold_mb = mult_frac(threshold_mb, def_size, max_size);
1943                 if (d->lod_lsfs_free_mb < threshold_mb)
1944                         def_size = rounddown(def_size / 2, LOD_DOM_MIN_SIZE_KB);
1945                 else if (d->lod_lsfs_free_mb > threshold_mb * 2)
1946                         def_size = max_t(unsigned int, def_size * 2,
1947                                          LOD_DOM_MIN_SIZE_KB);
1948         }
1949
1950         if (d->lod_dom_stripesize_cur_kb != def_size) {
1951                 CDEBUG(D_LAYOUT, "Change default DOM stripe size %d->%d\n",
1952                        d->lod_dom_stripesize_cur_kb, def_size);
1953                 d->lod_dom_stripesize_cur_kb = def_size;
1954         }
1955 }
1956
1957 static __u32 lod_dom_stripesize_limit(const struct lu_env *env,
1958                                       struct lod_device *d)
1959 {
1960         int rc;
1961
1962         /* set bfree as fraction of total space */
1963         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_STATFS_SPOOF)) {
1964                 spin_lock(&d->lod_lsfs_lock);
1965                 d->lod_lsfs_free_mb = mult_frac(d->lod_lsfs_total_mb,
1966                                         min_t(int, cfs_fail_val, 100), 100);
1967                 GOTO(recalc, rc = 0);
1968         }
1969
1970         if (d->lod_lsfs_age < ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE) {
1971                 struct obd_statfs sfs;
1972
1973                 spin_lock(&d->lod_lsfs_lock);
1974                 if (d->lod_lsfs_age > ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE)
1975                         GOTO(unlock, rc = 0);
1976
1977                 d->lod_lsfs_age = ktime_get_seconds();
1978                 spin_unlock(&d->lod_lsfs_lock);
1979                 rc = dt_statfs(env, d->lod_child, &sfs);
1980                 if (rc) {
1981                         CDEBUG(D_LAYOUT,
1982                                "%s: failed to get OSD statfs: rc = %d\n",
1983                                lod2obd(d)->obd_name, rc);
1984                         GOTO(out, rc);
1985                 }
1986                 /* udpate local OSD cached statfs data */
1987                 spin_lock(&d->lod_lsfs_lock);
1988                 d->lod_lsfs_total_mb = (sfs.os_blocks * sfs.os_bsize) >> 20;
1989                 d->lod_lsfs_free_mb = (sfs.os_bfree * sfs.os_bsize) >> 20;
1990 recalc:
1991                 lod_dom_stripesize_recalc(d);
1992 unlock:
1993                 spin_unlock(&d->lod_lsfs_lock);
1994         }
1995 out:
1996         return d->lod_dom_stripesize_cur_kb << 10;
1997 }
1998
1999 static int lod_dom_stripesize_choose(const struct lu_env *env,
2000                                      struct lod_device *d,
2001                                      struct lov_comp_md_v1 *comp_v1,
2002                                      struct lov_comp_md_entry_v1 *dom_ent,
2003                                      __u32 stripe_size)
2004 {
2005         struct lov_comp_md_entry_v1 *ent;
2006         struct lu_extent *dom_ext, *ext;
2007         struct lov_user_md_v1 *lum;
2008         __u32 max_stripe_size;
2009         __u16 mid, dom_mid;
2010         int rc = 0;
2011         bool dom_next_entry = false;
2012
2013         dom_ext = &dom_ent->lcme_extent;
2014         dom_mid = mirror_id_of(le32_to_cpu(dom_ent->lcme_id));
2015         max_stripe_size = lod_dom_stripesize_limit(env, d);
2016
2017         /* Check stripe size againts current per-MDT limit */
2018         if (stripe_size <= max_stripe_size)
2019                 return 0;
2020
2021         lum = (void *)comp_v1 + le32_to_cpu(dom_ent->lcme_offset);
2022         CDEBUG(D_LAYOUT, "overwrite DoM component size %u with MDT limit %u\n",
2023                stripe_size, max_stripe_size);
2024         lum->lmm_stripe_size = cpu_to_le32(max_stripe_size);
2025
2026         /* In common case the DoM stripe is first entry in a mirror and
2027          * can be deleted only if it is not single entry in layout or
2028          * mirror, otherwise error should be returned.
2029          */
2030         for_each_comp_entry_v1(comp_v1, ent) {
2031                 if (ent == dom_ent)
2032                         continue;
2033
2034                 mid = mirror_id_of(le32_to_cpu(ent->lcme_id));
2035                 if (mid != dom_mid)
2036                         continue;
2037
2038                 ext = &ent->lcme_extent;
2039                 if (ext->e_start != dom_ext->e_end)
2040                         continue;
2041
2042                 /* Found next component after the DoM one with the same
2043                  * mirror_id and adjust its start with DoM component end.
2044                  *
2045                  * NOTE: we are considering here that there can be only one
2046                  * DoM component in a file, all replicas are located on OSTs
2047                  * always and don't need adjustment since use own layouts.
2048                  */
2049                 ext->e_start = cpu_to_le64(max_stripe_size);
2050                 dom_next_entry = true;
2051                 break;
2052         }
2053
2054         if (max_stripe_size == 0) {
2055                 /* DoM component size is zero due to server setting, remove
2056                  * it from the layout but only if next component exists in
2057                  * the same mirror. That must be checked prior calling the
2058                  * lod_erase_dom_stripe().
2059                  */
2060                 if (!dom_next_entry)
2061                         return -EFBIG;
2062
2063                 rc = lod_erase_dom_stripe(comp_v1, dom_ent);
2064         } else {
2065                 /* Update DoM extent end finally */
2066                 dom_ext->e_end = cpu_to_le64(max_stripe_size);
2067         }
2068
2069         return rc;
2070 }
2071
2072 /**
2073  * Verify LOV striping.
2074  *
2075  * \param[in] d                 LOD device
2076  * \param[in] buf               buffer with LOV EA to verify
2077  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
2078  *                              1 - from disk, do not allow
2079  * \param[in] start             extent start for composite layout
2080  *
2081  * \retval                      0 if the striping is valid
2082  * \retval                      -EINVAL if striping is invalid
2083  */
2084 int lod_verify_striping(const struct lu_env *env, struct lod_device *d,
2085                         struct lod_object *lo, const struct lu_buf *buf,
2086                         bool is_from_disk)
2087 {
2088         struct lov_user_md_v1   *lum;
2089         struct lov_comp_md_v1   *comp_v1;
2090         struct lov_comp_md_entry_v1     *ent;
2091         struct lu_extent        *ext;
2092         struct lu_buf   tmp;
2093         __u64   prev_end = 0;
2094         __u32   stripe_size = 0;
2095         __u16   prev_mid = -1, mirror_id = -1;
2096         __u32   mirror_count;
2097         __u32   magic;
2098         int     rc = 0;
2099         ENTRY;
2100
2101         if (buf->lb_len < sizeof(lum->lmm_magic)) {
2102                 CDEBUG(D_LAYOUT, "invalid buf len %zu\n", buf->lb_len);
2103                 RETURN(-EINVAL);
2104         }
2105
2106         lum = buf->lb_buf;
2107
2108         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
2109         /* treat foreign LOV EA/object case first
2110          * XXX is it expected to try setting again a foreign?
2111          * XXX should we care about different current vs new layouts ?
2112          */
2113         if (unlikely(magic == LOV_USER_MAGIC_FOREIGN)) {
2114                 struct lov_foreign_md *lfm = buf->lb_buf;
2115
2116                 if (buf->lb_len < offsetof(typeof(*lfm), lfm_value)) {
2117                         CDEBUG(D_LAYOUT,
2118                                "buf len %zu < min lov_foreign_md size (%zu)\n",
2119                                buf->lb_len, offsetof(typeof(*lfm),
2120                                lfm_value));
2121                         RETURN(-EINVAL);
2122                 }
2123
2124                 if (lov_foreign_size_le(lfm) > buf->lb_len) {
2125                         CDEBUG(D_LAYOUT,
2126                                "buf len %zu < this lov_foreign_md size (%zu)\n",
2127                                buf->lb_len, lov_foreign_size_le(lfm));
2128                         RETURN(-EINVAL);
2129                 }
2130                 /* Don't do anything with foreign layouts */
2131                 RETURN(0);
2132         }
2133
2134         /* normal LOV/layout cases */
2135
2136         if (buf->lb_len < sizeof(*lum)) {
2137                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
2138                        buf->lb_len);
2139                 RETURN(-EINVAL);
2140         }
2141
2142         switch (magic) {
2143         case LOV_USER_MAGIC_FOREIGN:
2144                 RETURN(0);
2145         case LOV_USER_MAGIC_V1:
2146         case LOV_USER_MAGIC_V3:
2147         case LOV_USER_MAGIC_SPECIFIC:
2148                 if (lov_pattern(le32_to_cpu(lum->lmm_pattern)) &
2149                     LOV_PATTERN_MDT) {
2150                         /* DoM must use composite layout */
2151                         CDEBUG(D_LAYOUT, "DoM without composite layout\n");
2152                         RETURN(-EINVAL);
2153                 }
2154                 RETURN(lod_verify_v1v3(d, buf, is_from_disk));
2155         case LOV_USER_MAGIC_COMP_V1:
2156         case LOV_USER_MAGIC_SEL:
2157                 break;
2158         default:
2159                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
2160                        le32_to_cpu(lum->lmm_magic));
2161                 RETURN(-EINVAL);
2162         }
2163
2164         /* magic == LOV_USER_MAGIC_COMP_V1 */
2165         comp_v1 = buf->lb_buf;
2166         if (buf->lb_len < le32_to_cpu(comp_v1->lcm_size)) {
2167                 CDEBUG(D_LAYOUT, "buf len %zu is less than %u\n",
2168                        buf->lb_len, le32_to_cpu(comp_v1->lcm_size));
2169                 RETURN(-EINVAL);
2170         }
2171
2172 recheck:
2173         mirror_count = 0;
2174         if (le16_to_cpu(comp_v1->lcm_entry_count) == 0) {
2175                 CDEBUG(D_LAYOUT, "entry count is zero\n");
2176                 RETURN(-EINVAL);
2177         }
2178
2179         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
2180             lo->ldo_comp_cnt > 0) {
2181                 /* could be called from lustre.lov.add */
2182                 __u32 cnt = lo->ldo_comp_cnt;
2183
2184                 ext = &lo->ldo_comp_entries[cnt - 1].llc_extent;
2185                 prev_end = ext->e_end;
2186
2187                 ++mirror_count;
2188         }
2189
2190         for_each_comp_entry_v1(comp_v1, ent) {
2191                 ext = &ent->lcme_extent;
2192
2193                 if (le64_to_cpu(ext->e_start) > le64_to_cpu(ext->e_end) ||
2194                     le64_to_cpu(ext->e_start) & (LOV_MIN_STRIPE_SIZE - 1) ||
2195                     ((__s64)le64_to_cpu(ext->e_start) < 0 &&
2196                     le64_to_cpu(ext->e_start) != LUSTRE_EOF) ||
2197                     (le64_to_cpu(ext->e_end) != LUSTRE_EOF &&
2198                     le64_to_cpu(ext->e_end) & (LOV_MIN_STRIPE_SIZE - 1)) ||
2199                     ((__s64)le64_to_cpu(ext->e_end) < 0 &&
2200                     le64_to_cpu(ext->e_end) != LUSTRE_EOF)) {
2201                         CDEBUG(D_LAYOUT, "invalid extent "DEXT"\n",
2202                                le64_to_cpu(ext->e_start),
2203                                le64_to_cpu(ext->e_end));
2204                         RETURN(-EINVAL);
2205                 }
2206
2207                 if (is_from_disk) {
2208                         /* lcme_id contains valid value */
2209                         if (le32_to_cpu(ent->lcme_id) == 0 ||
2210                             le32_to_cpu(ent->lcme_id) > LCME_ID_MAX) {
2211                                 CDEBUG(D_LAYOUT, "invalid id %u\n",
2212                                        le32_to_cpu(ent->lcme_id));
2213                                 RETURN(-EINVAL);
2214                         }
2215
2216                         if (le16_to_cpu(comp_v1->lcm_mirror_count) > 0) {
2217                                 mirror_id = mirror_id_of(
2218                                                 le32_to_cpu(ent->lcme_id));
2219
2220                                 /* first component must start with 0 */
2221                                 if (mirror_id != prev_mid &&
2222                                     le64_to_cpu(ext->e_start) != 0) {
2223                                         CDEBUG(D_LAYOUT,
2224                                                "invalid start:%llu, expect:0\n",
2225                                                le64_to_cpu(ext->e_start));
2226                                         RETURN(-EINVAL);
2227                                 }
2228
2229                                 prev_mid = mirror_id;
2230                         }
2231                 }
2232
2233                 if (le64_to_cpu(ext->e_start) == 0) {
2234                         ++mirror_count;
2235                         prev_end = 0;
2236                 }
2237
2238                 /* the next must be adjacent with the previous one */
2239                 if (le64_to_cpu(ext->e_start) != prev_end) {
2240                         CDEBUG(D_LAYOUT,
2241                                "invalid start actual:%llu, expect:%llu\n",
2242                                le64_to_cpu(ext->e_start), prev_end);
2243                         RETURN(-EINVAL);
2244                 }
2245
2246                 tmp.lb_buf = (char *)comp_v1 + le32_to_cpu(ent->lcme_offset);
2247                 tmp.lb_len = le32_to_cpu(ent->lcme_size);
2248
2249                 lum = tmp.lb_buf;
2250                 if (le32_to_cpu(lum->lmm_magic) == LOV_MAGIC_FOREIGN) {
2251                         struct lov_foreign_md *lfm;
2252                         struct lov_hsm_md *lhm;
2253                         u32 hsmsize;
2254                         u32 ftype;
2255
2256                         /*
2257                          * Currently when the foreign layout is used as a basic
2258                          * layout component, it only supports HSM foreign types:
2259                          * LU_FOREIGN_TYPE_{POSIX, S3, PCCRW, PCCRO}.
2260                          */
2261                         lfm = (struct lov_foreign_md *)lum;
2262                         ftype = le32_to_cpu(lfm->lfm_type);
2263                         if (!lov_hsm_type_supported(ftype)) {
2264                                 CDEBUG(D_LAYOUT,
2265                                        "Foreign type %#x is not HSM\n", ftype);
2266                                 RETURN(-EINVAL);
2267                         }
2268
2269                         /* Current HSM component must cover [0, EOF]. */
2270                         if (le64_to_cpu(ext->e_start) > 0) {
2271                                 CDEBUG(D_LAYOUT, "Invalid HSM component with %llu extent start\n",
2272                                        le64_to_cpu(ext->e_start));
2273                                 RETURN(-EINVAL);
2274                         }
2275                         if (le64_to_cpu(ext->e_end) != LUSTRE_EOF) {
2276                                 CDEBUG(D_LAYOUT, "Invalid HSM component with %llu extent end\n",
2277                                        le64_to_cpu(ext->e_end));
2278                                 RETURN(-EINVAL);
2279                         }
2280
2281                         lhm = (struct lov_hsm_md *)lfm;
2282                         hsmsize = lov_foreign_size_le(lhm);
2283
2284                         if (le32_to_cpu(lhm->lhm_length) !=
2285                             sizeof(struct lov_hsm_base)) {
2286                                 CDEBUG(D_LAYOUT,
2287                                        "Invalid HSM component size %u != %u\n",
2288                                        le32_to_cpu(ent->lcme_size), hsmsize);
2289                                 RETURN(-EINVAL);
2290                         }
2291
2292                         if (le32_to_cpu(ent->lcme_size) < hsmsize) {
2293                                 CDEBUG(D_LAYOUT,
2294                                        "Invalid HSM component size %u != %u\n",
2295                                        le32_to_cpu(ent->lcme_size), hsmsize);
2296                                 RETURN(-EINVAL);
2297                         }
2298                         if (le32_to_cpu(lhm->lhm_flags) & ~HSM_FLAGS_MASK ||
2299                             !(le32_to_cpu(lhm->lhm_flags) & HSM_FLAGS_MASK)) {
2300                                 CDEBUG(D_LAYOUT,
2301                                        "Invalid HSM component flags %#x\n",
2302                                        le32_to_cpu(lhm->lhm_flags));
2303                                 RETURN(-EINVAL);
2304                         }
2305                         continue;
2306                 }
2307
2308                 /* Check DoM entry is always the first one */
2309                 if (lov_pattern(le32_to_cpu(lum->lmm_pattern)) &
2310                     LOV_PATTERN_MDT) {
2311                         /* DoM component must be the first in a mirror */
2312                         if (le64_to_cpu(ext->e_start) > 0) {
2313                                 CDEBUG(D_LAYOUT, "invalid DoM component "
2314                                        "with %llu extent start\n",
2315                                        le64_to_cpu(ext->e_start));
2316                                 RETURN(-EINVAL);
2317                         }
2318                         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2319                         /* There is just one stripe on MDT and it must
2320                          * cover whole component size. */
2321                         if (stripe_size != le64_to_cpu(ext->e_end)) {
2322                                 CDEBUG(D_LAYOUT, "invalid DoM layout "
2323                                        "stripe size %u != %llu "
2324                                        "(component size)\n",
2325                                        stripe_size, prev_end);
2326                                 RETURN(-EINVAL);
2327                         }
2328                         /* Check and adjust stripe size by per-MDT limit */
2329                         rc = lod_dom_stripesize_choose(env, d, comp_v1, ent,
2330                                                        stripe_size);
2331                         /* DoM entry was removed, re-check layout from start */
2332                         if (rc == -ERESTART)
2333                                 goto recheck;
2334                         else if (rc)
2335                                 RETURN(rc);
2336
2337                         if (le16_to_cpu(lum->lmm_stripe_count) == 1)
2338                                 lum->lmm_stripe_count = 0;
2339                         /* Any stripe count is forbidden on DoM component */
2340                         if (lum->lmm_stripe_count > 0) {
2341                                 CDEBUG(D_LAYOUT,
2342                                        "invalid DoM layout stripe count %u, must be 0\n",
2343                                        le16_to_cpu(lum->lmm_stripe_count));
2344                                 RETURN(-EINVAL);
2345                         }
2346
2347                         /* Any pool is forbidden on DoM component */
2348                         if (lum->lmm_magic == LOV_USER_MAGIC_V3) {
2349                                 struct lov_user_md_v3 *v3 = (void *)lum;
2350
2351                                 if (v3->lmm_pool_name[0] != '\0') {
2352                                         CDEBUG(D_LAYOUT,
2353                                                "DoM component cannot have pool assigned\n");
2354                                         RETURN(-EINVAL);
2355                                 }
2356                         }
2357                 }
2358
2359                 prev_end = le64_to_cpu(ext->e_end);
2360
2361                 rc = lod_verify_v1v3(d, &tmp, is_from_disk);
2362                 if (rc)
2363                         RETURN(rc);
2364
2365                 if (prev_end == LUSTRE_EOF || ext->e_start == prev_end)
2366                         continue;
2367
2368                 /* extent end must be aligned with the stripe_size */
2369                 stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2370                 if (stripe_size && prev_end % stripe_size) {
2371                         CDEBUG(D_LAYOUT, "stripe size isn't aligned, "
2372                                "stripe_sz: %u, [%llu, %llu)\n",
2373                                stripe_size, ext->e_start, prev_end);
2374                         RETURN(-EINVAL);
2375                 }
2376         }
2377
2378         /* make sure that the mirror_count is telling the truth */
2379         if (mirror_count != le16_to_cpu(comp_v1->lcm_mirror_count) + 1)
2380                 RETURN(-EINVAL);
2381
2382         RETURN(0);
2383 }
2384
2385 /**
2386  * set the default stripe size, if unset.
2387  *
2388  * \param[in,out] val   number of bytes per OST stripe
2389  *
2390  * The minimum stripe size is 64KB to ensure that a single stripe is an
2391  * even multiple of a client PAGE_SIZE (IA64, PPC, etc).  Otherwise, it
2392  * is difficult to split dirty pages across OSCs during writes.
2393  */
2394 void lod_fix_desc_stripe_size(__u64 *val)
2395 {
2396         if (*val < LOV_MIN_STRIPE_SIZE) {
2397                 if (*val != 0)
2398                         LCONSOLE_INFO("Increasing default stripe size to "
2399                                       "minimum value %u\n",
2400                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
2401                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
2402         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
2403                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
2404                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
2405                               "multiple of %u)\n",
2406                               *val, LOV_MIN_STRIPE_SIZE);
2407         }
2408 }
2409
2410 /**
2411  * set the filesystem default number of stripes, if unset.
2412  *
2413  * \param[in,out] val   number of stripes
2414  *
2415  * A value of "0" means "use the system-wide default stripe count", which
2416  * has either been inherited by now, or falls back to 1 stripe per file.
2417  * A value of "-1" (0xffffffff) means "stripe over all available OSTs",
2418  * and is a valid value, so is left unchanged here.
2419  */
2420 void lod_fix_desc_stripe_count(__u32 *val)
2421 {
2422         if (*val == 0)
2423                 *val = 1;
2424 }
2425
2426 /**
2427  * set the filesystem default layout pattern
2428  *
2429  * \param[in,out] val   LOV_PATTERN_* layout
2430  *
2431  * A value of "0" means "use the system-wide default layout type", which
2432  * has either been inherited by now, or falls back to plain RAID0 striping.
2433  */
2434 void lod_fix_desc_pattern(__u32 *val)
2435 {
2436         /* from lov_setstripe */
2437         if ((*val != 0) && !lov_pattern_supported_normal_comp(*val)) {
2438                 LCONSOLE_WARN("lod: Unknown stripe pattern: %#x\n", *val);
2439                 *val = 0;
2440         }
2441 }
2442
2443 void lod_fix_lmv_desc_pattern(__u32 *val)
2444 {
2445         if ((*val) && !lmv_is_known_hash_type(*val)) {
2446                 LCONSOLE_WARN("lod: Unknown md stripe pattern: %#x\n", *val);
2447                 *val = 0;
2448         }
2449 }
2450
2451 void lod_fix_desc_qos_maxage(__u32 *val)
2452 {
2453         /* fix qos_maxage */
2454         if (*val == 0)
2455                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
2456 }
2457
2458 /**
2459  * Used to fix insane default striping.
2460  *
2461  * \param[in] desc      striping description
2462  */
2463 void lod_fix_desc(struct lov_desc *desc)
2464 {
2465         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
2466         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2467         lod_fix_desc_pattern(&desc->ld_pattern);
2468         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2469 }
2470
2471 static void lod_fix_lmv_desc(struct lmv_desc *desc)
2472 {
2473         desc->ld_active_tgt_count = 0;
2474         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2475         lod_fix_lmv_desc_pattern(&desc->ld_pattern);
2476         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2477 }
2478
2479 /**
2480  * Initialize the structures used to store pools and default striping.
2481  *
2482  * \param[in] lod       LOD device
2483  * \param[in] lcfg      configuration structure storing default striping.
2484  *
2485  * \retval              0 if initialization succeeds
2486  * \retval              negative error number on failure
2487  */
2488 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
2489 {
2490         struct obd_device          *obd;
2491         struct lov_desc            *desc;
2492         int                         rc;
2493         ENTRY;
2494
2495         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
2496         LASSERT(obd != NULL);
2497         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
2498
2499         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
2500                 CERROR("LOD setup requires a descriptor\n");
2501                 RETURN(-EINVAL);
2502         }
2503
2504         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
2505
2506         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
2507                 CERROR("descriptor size wrong: %d > %d\n",
2508                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
2509                 RETURN(-EINVAL);
2510         }
2511
2512         if (desc->ld_magic != LOV_DESC_MAGIC) {
2513                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
2514                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
2515                                obd->obd_name, desc);
2516                         lustre_swab_lov_desc(desc);
2517                 } else {
2518                         CERROR("%s: Bad lov desc magic: %#x\n",
2519                                obd->obd_name, desc->ld_magic);
2520                         RETURN(-EINVAL);
2521                 }
2522         }
2523
2524         lod_fix_desc(desc);
2525
2526         desc->ld_active_tgt_count = 0;
2527         lod->lod_ost_descs.ltd_lov_desc = *desc;
2528
2529         /* NB: config doesn't contain lmv_desc, alter it via sysfs. */
2530         lod_fix_lmv_desc(&lod->lod_mdt_descs.ltd_lmv_desc);
2531
2532         lod->lod_sp_me = LUSTRE_SP_CLI;
2533
2534         /* Set up OST pool environment */
2535         lod->lod_pool_count = 0;
2536         rc = lod_pool_hash_init(&lod->lod_pools_hash_body);
2537         if (rc)
2538                 RETURN(-ENOMEM);
2539
2540         INIT_LIST_HEAD(&lod->lod_pool_list);
2541         lod->lod_pool_count = 0;
2542         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_tgt_pool, 0);
2543         if (rc)
2544                 GOTO(out_hash, rc);
2545
2546         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool, 0);
2547         if (rc)
2548                 GOTO(out_mdt_pool, rc);
2549
2550         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_tgt_pool, 0);
2551         if (rc)
2552                 GOTO(out_mdt_rr_pool, rc);
2553
2554         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool, 0);
2555         if (rc)
2556                 GOTO(out_ost_pool, rc);
2557
2558         RETURN(0);
2559
2560 out_ost_pool:
2561         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2562 out_mdt_rr_pool:
2563         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2564 out_mdt_pool:
2565         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2566 out_hash:
2567         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2568
2569         return rc;
2570 }
2571
2572 /**
2573  * Release the structures describing the pools.
2574  *
2575  * \param[in] lod       LOD device from which we release the structures
2576  *
2577  * \retval              0 always
2578  */
2579 int lod_pools_fini(struct lod_device *lod)
2580 {
2581         struct obd_device   *obd = lod2obd(lod);
2582         struct lod_pool_desc *pool, *tmp;
2583         ENTRY;
2584
2585         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
2586                 /* free pool structs */
2587                 CDEBUG(D_INFO, "delete pool %p\n", pool);
2588                 /* In the function below, .hs_keycmp resolves to
2589                  * pool_hashkey_keycmp() */
2590                 lod_pool_del(obd, pool->pool_name);
2591         }
2592
2593         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2594         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool);
2595         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2596         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2597         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2598
2599         RETURN(0);
2600 }