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