lustre/lod/lod_lov.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.  A copy is
  14  * included in the COPYING file that accompanied this code.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright  2009 Sun Microsystems, Inc. All rights reserved
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * lustre/lod/lod_lov.c
  30  *
  31  * A set of helpers to maintain Logical Object Volume (LOV)
  32  * Extended Attribute (EA) and known OST targets
  33  *
  34  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_MDS
  38
  39 #include <obd_class.h>
  40 #include <lustre_lfsck.h>
  41 #include <lustre_lmv.h>
  42 #include <lustre_swab.h>
  43
  44 #include "lod_internal.h"
  45
  46 /**
  47  * Increase reference count on the target table.
  48  *
  49  * Increase reference count on the target table usage to prevent racing with
  50  * addition/deletion. Any function that expects the table to remain
  51  * stationary must take a ref.
  52  *
  53  * \param[in] ltd       target table (lod_ost_descs or lod_mdt_descs)
  54  */
  55 void lod_getref(struct lod_tgt_descs *ltd)
  56 {
  57         down_read(&ltd->ltd_rw_sem);
  58         mutex_lock(&ltd->ltd_mutex);
  59         ltd->ltd_refcount++;
  60         mutex_unlock(&ltd->ltd_mutex);
  61 }
  62
  63 /**
  64  * Decrease reference count on the target table.
  65  *
  66  * Companion of lod_getref() to release a reference on the target table.
  67  * If this is the last reference and the OST entry was scheduled for deletion,
  68  * the descriptor is removed from the table.
  69  *
  70  * \param[in] lod       LOD device from which we release a reference
  71  * \param[in] ltd       target table (lod_ost_descs or lod_mdt_descs)
  72  */
  73 void lod_putref(struct lod_device *lod, struct lod_tgt_descs *ltd)
  74 {
  75         mutex_lock(&ltd->ltd_mutex);
  76         ltd->ltd_refcount--;
  77         if (ltd->ltd_refcount == 0 && ltd->ltd_death_row) {
  78                 struct lod_tgt_desc *tgt_desc, *tmp;
  79                 LIST_HEAD(kill);
  80
  81                 CDEBUG(D_CONFIG, "destroying %d ltd desc\n",
  82                        ltd->ltd_death_row);
  83
  84                 ltd_foreach_tgt_safe(ltd, tgt_desc, tmp) {
  85                         LASSERT(tgt_desc);
  86                         if (!tgt_desc->ltd_reap)
  87                                 continue;
  88
  89                         list_add(&tgt_desc->ltd_kill, &kill);
  90                         lu_tgt_pool_remove(&ltd->ltd_tgt_pool,
  91                                            tgt_desc->ltd_index);
  92                         ltd_del_tgt(ltd, tgt_desc);
  93                         ltd->ltd_death_row--;
  94                 }
  95                 mutex_unlock(&ltd->ltd_mutex);
  96                 up_read(&ltd->ltd_rw_sem);
  97
  98                 list_for_each_entry_safe(tgt_desc, tmp, &kill, ltd_kill) {
  99                         int rc;
 100
 101                         list_del(&tgt_desc->ltd_kill);
 102                         rc = obd_disconnect(tgt_desc->ltd_exp);
 103                         if (rc)
 104                                 CERROR("%s: failed to disconnect %s: rc = %d\n",
 105                                        lod2obd(lod)->obd_name,
 106                                        obd_uuid2str(&tgt_desc->ltd_uuid), rc);
 107                         OBD_FREE_PTR(tgt_desc);
 108                 }
 109         } else {
 110                 mutex_unlock(&ltd->ltd_mutex);
 111                 up_read(&ltd->ltd_rw_sem);
 112         }
 113 }
 114
 115 /**
 116  * Connect LOD to a new OSP and add it to the target table.
 117  *
 118  * Connect to the OSP device passed, initialize all the internal
 119  * structures related to the device and add it to the target table.
 120  *
 121  * \param[in] env               execution environment for this thread
 122  * \param[in] lod               LOD device to be connected to the new OSP
 123  * \param[in] osp               name of OSP device name to be added
 124  * \param[in] index             index of the new target
 125  * \param[in] gen               target's generation number
 126  * \param[in] tgt_index         OSP's group
 127  * \param[in] type              type of device (mdc or osc)
 128  * \param[in] active            state of OSP: 0 - inactive, 1 - active
 129  *
 130  * \retval                      0 if added successfully
 131  * \retval                      negative error number on failure
 132  */
 133 int lod_add_device(const struct lu_env *env, struct lod_device *lod,
 134                    char *osp, unsigned index, unsigned gen, int tgt_index,
 135                    char *type, int active)
 136 {
 137         struct obd_connect_data *data = NULL;
 138         struct obd_export       *exp = NULL;
 139         struct obd_device       *obd;
 140         struct lu_device        *lu_dev;
 141         struct dt_device        *dt_dev;
 142         int                      rc;
 143         struct lod_tgt_desc     *tgt_desc;
 144         struct lod_tgt_descs    *ltd;
 145         struct lustre_cfg       *lcfg;
 146         struct obd_uuid         obd_uuid;
 147         bool                    for_ost;
 148         bool connected = false;
 149         ENTRY;
 150
 151         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, index, gen);
 152
 153         if (gen <= 0) {
 154                 CERROR("request to add OBD %s with invalid generation: %d\n",
 155                        osp, gen);
 156                 RETURN(-EINVAL);
 157         }
 158
 159         obd_str2uuid(&obd_uuid, osp);
 160
 161         obd = class_find_client_obd(&obd_uuid, LUSTRE_OSP_NAME,
 162                                 &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 163         if (obd == NULL) {
 164                 CERROR("can't find %s device\n", osp);
 165                 RETURN(-EINVAL);
 166         }
 167
 168         LASSERT(obd->obd_lu_dev != NULL);
 169         LASSERT(obd->obd_lu_dev->ld_site == lod->lod_dt_dev.dd_lu_dev.ld_site);
 170
 171         lu_dev = obd->obd_lu_dev;
 172         dt_dev = lu2dt_dev(lu_dev);
 173
 174         OBD_ALLOC_PTR(data);
 175         if (data == NULL)
 176                 GOTO(out_cleanup, rc = -ENOMEM);
 177
 178         data->ocd_connect_flags = OBD_CONNECT_INDEX | OBD_CONNECT_VERSION |
 179                                   OBD_CONNECT_FLAGS2;
 180         data->ocd_version = LUSTRE_VERSION_CODE;
 181         data->ocd_index = index;
 182
 183         if (strcmp(LUSTRE_OSC_NAME, type) == 0) {
 184                 for_ost = true;
 185                 data->ocd_connect_flags |= OBD_CONNECT_AT |
 186                                            OBD_CONNECT_FULL20 |
 187                                            OBD_CONNECT_INDEX |
 188 #ifdef HAVE_LRU_RESIZE_SUPPORT
 189                                            OBD_CONNECT_LRU_RESIZE |
 190 #endif
 191                                            OBD_CONNECT_MDS |
 192                                            OBD_CONNECT_REQPORTAL |
 193                                            OBD_CONNECT_SKIP_ORPHAN |
 194                                            OBD_CONNECT_FID |
 195                                            OBD_CONNECT_LVB_TYPE |
 196                                            OBD_CONNECT_VERSION |
 197                                            OBD_CONNECT_PINGLESS |
 198                                            OBD_CONNECT_LFSCK |
 199                                            OBD_CONNECT_BULK_MBITS;
 200                 data->ocd_connect_flags2 = OBD_CONNECT2_REPLAY_CREATE;
 201
 202                 data->ocd_group = tgt_index;
 203                 ltd = &lod->lod_ost_descs;
 204         } else {
 205                 struct obd_import *imp = obd->u.cli.cl_import;
 206
 207                 for_ost = false;
 208                 data->ocd_ibits_known = MDS_INODELOCK_UPDATE;
 209                 data->ocd_connect_flags |= OBD_CONNECT_ACL |
 210                                            OBD_CONNECT_IBITS |
 211                                            OBD_CONNECT_MDS_MDS |
 212                                            OBD_CONNECT_MULTIMODRPCS |
 213                                            OBD_CONNECT_FID |
 214                                            OBD_CONNECT_AT |
 215                                            OBD_CONNECT_FULL20 |
 216                                            OBD_CONNECT_LFSCK |
 217                                            OBD_CONNECT_BULK_MBITS;
 218                 spin_lock(&imp->imp_lock);
 219                 imp->imp_server_timeout = 1;
 220                 spin_unlock(&imp->imp_lock);
 221                 imp->imp_client->cli_request_portal = OUT_PORTAL;
 222                 CDEBUG(D_OTHER, "%s: Set 'mds' portal and timeout\n",
 223                       obd->obd_name);
 224                 ltd = &lod->lod_mdt_descs;
 225         }
 226
 227         rc = obd_connect(env, &exp, obd, &obd->obd_uuid, data, NULL);
 228         OBD_FREE_PTR(data);
 229         if (rc) {
 230                 CERROR("%s: cannot connect to next dev %s (%d)\n",
 231                        obd->obd_name, osp, rc);
 232                 GOTO(out_cleanup, rc);
 233         }
 234         connected = true;
 235
 236         /* Allocate ost descriptor and fill it */
 237         OBD_ALLOC_PTR(tgt_desc);
 238         if (!tgt_desc)
 239                 GOTO(out_cleanup, rc = -ENOMEM);
 240
 241         tgt_desc->ltd_tgt    = dt_dev;
 242         tgt_desc->ltd_exp    = exp;
 243         tgt_desc->ltd_uuid   = obd->u.cli.cl_target_uuid;
 244         tgt_desc->ltd_gen    = gen;
 245         tgt_desc->ltd_index  = index;
 246         tgt_desc->ltd_active = active;
 247
 248         down_write(&ltd->ltd_rw_sem);
 249         mutex_lock(&ltd->ltd_mutex);
 250         rc = ltd_add_tgt(ltd, tgt_desc);
 251         if (rc)
 252                 GOTO(out_mutex, rc);
 253
 254         rc = lu_qos_add_tgt(&ltd->ltd_qos, tgt_desc);
 255         if (rc)
 256                 GOTO(out_del_tgt, rc);
 257
 258         rc = lu_tgt_pool_add(&ltd->ltd_tgt_pool, index,
 259                           ltd->ltd_lov_desc.ld_tgt_count);
 260         if (rc) {
 261                 CERROR("%s: can't set up pool, failed with %d\n",
 262                        obd->obd_name, rc);
 263                 GOTO(out_del_tgt, rc);
 264         }
 265
 266         mutex_unlock(&ltd->ltd_mutex);
 267         up_write(&ltd->ltd_rw_sem);
 268
 269         if (lod->lod_recovery_completed)
 270                 lu_dev->ld_ops->ldo_recovery_complete(env, lu_dev);
 271
 272         if (!for_ost && lod->lod_initialized) {
 273                 rc = lod_sub_init_llog(env, lod, tgt_desc->ltd_tgt);
 274                 if (rc != 0) {
 275                         CERROR("%s: cannot start llog on %s:rc = %d\n",
 276                                lod2obd(lod)->obd_name, osp, rc);
 277                         GOTO(out_ltd, rc);
 278                 }
 279         }
 280
 281         rc = lfsck_add_target(env, lod->lod_child, dt_dev, exp, index, for_ost);
 282         if (rc != 0) {
 283                 CERROR("Fail to add LFSCK target: name = %s, type = %s, "
 284                        "index = %u, rc = %d\n", osp, type, index, rc);
 285                 GOTO(out_fini_llog, rc);
 286         }
 287         RETURN(rc);
 288 out_fini_llog:
 289         lod_sub_fini_llog(env, tgt_desc->ltd_tgt,
 290                           &tgt_desc->ltd_recovery_task);
 291 out_ltd:
 292         down_write(&ltd->ltd_rw_sem);
 293         mutex_lock(&ltd->ltd_mutex);
 294         lu_tgt_pool_remove(&ltd->ltd_tgt_pool, index);
 295 out_del_tgt:
 296         ltd_del_tgt(ltd, tgt_desc);
 297 out_mutex:
 298         mutex_unlock(&ltd->ltd_mutex);
 299         up_write(&ltd->ltd_rw_sem);
 300         OBD_FREE_PTR(tgt_desc);
 301 out_cleanup:
 302         /* XXX OSP needs us to send down LCFG_CLEANUP because it uses
 303          * objects from the MDT stack. See LU-7184. */
 304         lcfg = &lod_env_info(env)->lti_lustre_cfg;
 305         memset(lcfg, 0, sizeof(*lcfg));
 306         lcfg->lcfg_version = LUSTRE_CFG_VERSION;
 307         lcfg->lcfg_command = LCFG_CLEANUP;
 308         lu_dev->ld_ops->ldo_process_config(env, lu_dev, lcfg);
 309
 310         if (connected)
 311                 obd_disconnect(exp);
 312
 313         return rc;
 314 }
 315
 316 /**
 317  * Schedule target removal from the target table.
 318  *
 319  * Mark the device as dead. The device is not removed here because it may
 320  * still be in use. The device will be removed in lod_putref() when the
 321  * last reference is released.
 322  *
 323  * \param[in] env               execution environment for this thread
 324  * \param[in] lod               LOD device the target table belongs to
 325  * \param[in] ltd               target table
 326  * \param[in] tgt               target
 327  */
 328 static void __lod_del_device(const struct lu_env *env, struct lod_device *lod,
 329                              struct lod_tgt_descs *ltd, struct lu_tgt_desc *tgt)
 330 {
 331         lfsck_del_target(env, lod->lod_child, tgt->ltd_tgt, tgt->ltd_index,
 332                          !ltd->ltd_is_mdt);
 333
 334         if (!tgt->ltd_reap) {
 335                 tgt->ltd_reap = 1;
 336                 ltd->ltd_death_row++;
 337         }
 338 }
 339
 340 /**
 341  * Schedule removal of all the targets from the given target table.
 342  *
 343  * See more details in the description for __lod_del_device()
 344  *
 345  * \param[in] env               execution environment for this thread
 346  * \param[in] lod               LOD device the target table belongs to
 347  * \param[in] ltd               target table
 348  *
 349  * \retval                      0 always
 350  */
 351 int lod_fini_tgt(const struct lu_env *env, struct lod_device *lod,
 352                  struct lod_tgt_descs *ltd)
 353 {
 354         struct lu_tgt_desc *tgt;
 355
 356         if (ltd->ltd_tgts_size <= 0)
 357                 return 0;
 358
 359         lod_getref(ltd);
 360         mutex_lock(&ltd->ltd_mutex);
 361         ltd_foreach_tgt(ltd, tgt)
 362                 __lod_del_device(env, lod, ltd, tgt);
 363         mutex_unlock(&ltd->ltd_mutex);
 364         lod_putref(lod, ltd);
 365
 366         lu_tgt_descs_fini(ltd);
 367
 368         return 0;
 369 }
 370
 371 /**
 372  * Remove device by name.
 373  *
 374  * Remove a device identified by \a osp from the target table. Given
 375  * the device can be in use, the real deletion happens in lod_putref().
 376  *
 377  * \param[in] env               execution environment for this thread
 378  * \param[in] lod               LOD device to be connected to the new OSP
 379  * \param[in] ltd               target table
 380  * \param[in] osp               name of OSP device to be removed
 381  * \param[in] idx               index of the target
 382  * \param[in] gen               generation number, not used currently
 383  *
 384  * \retval                      0 if the device was scheduled for removal
 385  * \retval                      -EINVAL if no device was found
 386  */
 387 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
 388                    struct lod_tgt_descs *ltd, char *osp, unsigned int idx,
 389                    unsigned int gen)
 390 {
 391         struct obd_device *obd;
 392         struct lu_tgt_desc *tgt;
 393         struct obd_uuid uuid;
 394         int rc = 0;
 395
 396         ENTRY;
 397
 398         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
 399
 400         obd_str2uuid(&uuid, osp);
 401
 402         obd = class_find_client_obd(&uuid, LUSTRE_OSP_NAME,
 403                                    &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 404         if (obd == NULL) {
 405                 CERROR("can't find %s device\n", osp);
 406                 RETURN(-EINVAL);
 407         }
 408
 409         if (gen <= 0) {
 410                 CERROR("%s: request to remove OBD %s with invalid generation %d"
 411                        "\n", obd->obd_name, osp, gen);
 412                 RETURN(-EINVAL);
 413         }
 414
 415         obd_str2uuid(&uuid,  osp);
 416
 417         lod_getref(ltd);
 418         mutex_lock(&ltd->ltd_mutex);
 419         tgt = LTD_TGT(ltd, idx);
 420         /* check that the index is allocated in the bitmap */
 421         if (!test_bit(idx, ltd->ltd_tgt_bitmap) || !tgt) {
 422                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
 423                 GOTO(out, rc = -EINVAL);
 424         }
 425
 426         /* check that the UUID matches */
 427         if (!obd_uuid_equals(&uuid, &tgt->ltd_uuid)) {
 428                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
 429                        obd->obd_name, obd_uuid2str(&tgt->ltd_uuid), idx, osp);
 430                 GOTO(out, rc = -EINVAL);
 431         }
 432
 433         __lod_del_device(env, lod, ltd, tgt);
 434         EXIT;
 435 out:
 436         mutex_unlock(&ltd->ltd_mutex);
 437         lod_putref(lod, ltd);
 438         return(rc);
 439 }
 440
 441 /**
 442  * Resize per-thread storage to hold specified size.
 443  *
 444  * A helper function to resize per-thread temporary storage. This storage
 445  * is used to process LOV/LVM EAs and may be quite large. We do not want to
 446  * allocate/release it every time, so instead we put it into the env and
 447  * reallocate on demand. The memory is released when the correspondent thread
 448  * is finished.
 449  *
 450  * \param[in] info              LOD-specific storage in the environment
 451  * \param[in] size              new size to grow the buffer to
 452
 453  * \retval                      0 on success, -ENOMEM if reallocation failed
 454  */
 455 int lod_ea_store_resize(struct lod_thread_info *info, size_t size)
 456 {
 457         __u32 round = size_roundup_power2(size);
 458
 459         if (info->lti_ea_store) {
 460                 LASSERT(info->lti_ea_store_size);
 461                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
 462                        info->lti_ea_store_size, round);
 463                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
 464                 info->lti_ea_store = NULL;
 465                 info->lti_ea_store_size = 0;
 466         }
 467
 468         OBD_ALLOC_LARGE(info->lti_ea_store, round);
 469         if (info->lti_ea_store == NULL)
 470                 RETURN(-ENOMEM);
 471         info->lti_ea_store_size = round;
 472
 473         RETURN(0);
 474 }
 475
 476 static void lod_free_comp_buffer(struct lod_layout_component *entries,
 477                                  __u16 count, __u32 bufsize)
 478 {
 479         struct lod_layout_component *entry;
 480         int i;
 481
 482         for (i = 0; i < count; i++) {
 483                 entry = &entries[i];
 484                 if (entry->llc_magic == LOV_MAGIC_FOREIGN)
 485                         continue;
 486                 if (entry->llc_pool != NULL)
 487                         lod_set_pool(&entry->llc_pool, NULL);
 488                 if (entry->llc_ostlist.op_array)
 489                         OBD_FREE(entry->llc_ostlist.op_array,
 490                                  entry->llc_ostlist.op_size);
 491                 LASSERT(entry->llc_stripe == NULL);
 492                 LASSERT(entry->llc_stripes_allocated == 0);
 493         }
 494
 495         if (bufsize != 0)
 496                 OBD_FREE_LARGE(entries, bufsize);
 497 }
 498
 499 void lod_free_def_comp_entries(struct lod_default_striping *lds)
 500 {
 501         lod_free_comp_buffer(lds->lds_def_comp_entries,
 502                              lds->lds_def_comp_size_cnt,
 503                              size_roundup_power2(
 504                                      sizeof(*lds->lds_def_comp_entries) *
 505                                      lds->lds_def_comp_size_cnt));
 506         lds->lds_def_comp_entries = NULL;
 507         lds->lds_def_comp_cnt = 0;
 508         lds->lds_def_striping_is_composite = 0;
 509         lds->lds_def_comp_size_cnt = 0;
 510 }
 511
 512 /**
 513  * Resize per-thread storage to hold default striping component entries
 514  *
 515  * A helper function to resize per-thread temporary storage. This storage
 516  * is used to hold default LOV/LVM EAs and may be quite large. We do not want
 517  * to allocate/release it every time, so instead we put it into the env and
 518  * reallocate it on demand. The memory is released when the correspondent
 519  * thread is finished.
 520  *
 521  * \param[in,out] lds           default striping
 522  * \param[in] count             new component count to grow the buffer to
 523
 524  * \retval                      0 on success, -ENOMEM if reallocation failed
 525  */
 526 int lod_def_striping_comp_resize(struct lod_default_striping *lds, __u16 count)
 527 {
 528         struct lod_layout_component *entries;
 529         __u32 new = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
 530                                         count);
 531         __u32 old = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
 532                                         lds->lds_def_comp_size_cnt);
 533
 534         if (new <= old)
 535                 return 0;
 536
 537         OBD_ALLOC_LARGE(entries, new);
 538         if (entries == NULL)
 539                 return -ENOMEM;
 540
 541         if (lds->lds_def_comp_entries != NULL) {
 542                 CDEBUG(D_INFO, "default striping component size %d is not "
 543                        "enough, need %d\n", old, new);
 544                 lod_free_def_comp_entries(lds);
 545         }
 546
 547         lds->lds_def_comp_entries = entries;
 548         lds->lds_def_comp_size_cnt = count;
 549
 550         RETURN(0);
 551 }
 552
 553 void lod_free_comp_entries(struct lod_object *lo)
 554 {
 555         if (lo->ldo_mirrors) {
 556                 OBD_FREE_PTR_ARRAY(lo->ldo_mirrors, lo->ldo_mirror_count);
 557                 lo->ldo_mirrors = NULL;
 558                 lo->ldo_mirror_count = 0;
 559         }
 560         lod_free_comp_buffer(lo->ldo_comp_entries,
 561                              lo->ldo_comp_cnt,
 562                              sizeof(*lo->ldo_comp_entries) * lo->ldo_comp_cnt);
 563         lo->ldo_comp_entries = NULL;
 564         lo->ldo_comp_cnt = 0;
 565         lo->ldo_is_composite = 0;
 566 }
 567
 568 int lod_alloc_comp_entries(struct lod_object *lo,
 569                            int mirror_count, int comp_count)
 570 {
 571         LASSERT(comp_count != 0);
 572         LASSERT(lo->ldo_comp_cnt == 0 && lo->ldo_comp_entries == NULL);
 573
 574         if (mirror_count > 0) {
 575                 OBD_ALLOC_PTR_ARRAY(lo->ldo_mirrors, mirror_count);
 576                 if (!lo->ldo_mirrors)
 577                         return -ENOMEM;
 578
 579                 lo->ldo_mirror_count = mirror_count;
 580         }
 581
 582         OBD_ALLOC_LARGE(lo->ldo_comp_entries,
 583                         sizeof(*lo->ldo_comp_entries) * comp_count);
 584         if (lo->ldo_comp_entries == NULL) {
 585                 OBD_FREE_PTR_ARRAY(lo->ldo_mirrors, mirror_count);
 586                 lo->ldo_mirrors = NULL;
 587                 lo->ldo_mirror_count = 0;
 588                 return -ENOMEM;
 589         }
 590
 591         lo->ldo_comp_cnt = comp_count;
 592         lo->ldo_is_foreign = 0;
 593         return 0;
 594 }
 595
 596 int lod_fill_mirrors(struct lod_object *lo)
 597 {
 598         struct lod_device *lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 599         struct lod_layout_component *lod_comp;
 600         bool found_preferred = false;
 601         int mirror_idx = -1;
 602         __u16 mirror_id = 0xffff;
 603         int i, pref;
 604         ENTRY;
 605
 606         LASSERT(equi(!lo->ldo_is_composite, lo->ldo_mirror_count == 0));
 607
 608         if (!lo->ldo_is_composite)
 609                 RETURN(0);
 610
 611         lod_comp = &lo->ldo_comp_entries[0];
 612
 613         for (i = 0; i < lo->ldo_comp_cnt; i++, lod_comp++) {
 614                 bool stale = lod_comp->llc_flags & LCME_FL_STALE;
 615                 bool preferred = lod_comp->llc_flags & LCME_FL_PREF_WR;
 616                 bool mirror_hsm = lod_is_hsm(lod_comp);
 617                 bool init = (lod_comp->llc_stripe != NULL) &&
 618                             !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
 619                             !(lod_comp->llc_pattern & LOV_PATTERN_MDT);
 620                 int j;
 621
 622                 pref = 0;
 623                 /* calculate component preference over all used OSTs */
 624                 for (j = 0; init && j < lod_comp->llc_stripes_allocated; j++) {
 625                         __u32 idx = lod_comp->llc_ost_indices[j];
 626                         struct lod_tgt_desc *ltd;
 627
 628                         if (lod_comp->llc_stripe[j] == NULL)
 629                                 continue;
 630
 631                         if (unlikely(idx >= lod->lod_ost_descs.ltd_tgts_size)) {
 632                                 CERROR("%s: "DFID" OST idx %u > max %u\n",
 633                                        lod2obd(lod)->obd_name,
 634                                        PFID(lu_object_fid(&lo->ldo_obj.do_lu)),
 635                                        idx, lod->lod_ost_descs.ltd_tgts_size);
 636                                 continue;
 637                         }
 638                         ltd = OST_TGT(lod, idx);
 639                         if (unlikely(!ltd)) {
 640                                 CERROR("%s: "DFID" OST idx %u is NULL\n",
 641                                        lod2obd(lod)->obd_name,
 642                                        PFID(lu_object_fid(&lo->ldo_obj.do_lu)),
 643                                        idx);
 644                                 continue;
 645                         }
 646
 647                         if (ltd->ltd_statfs.os_state & OS_STATFS_NONROT)
 648                                 pref++;
 649                 }
 650
 651                 if (mirror_id_of(lod_comp->llc_id) == mirror_id) {
 652                         /* Currently HSM mirror does not support PFL. */
 653                         if (lo->ldo_mirrors[mirror_idx].lme_hsm)
 654                                 RETURN(-EINVAL);
 655                         lo->ldo_mirrors[mirror_idx].lme_stale |= stale;
 656                         lo->ldo_mirrors[mirror_idx].lme_prefer |= preferred;
 657                         lo->ldo_mirrors[mirror_idx].lme_preference += pref;
 658                         lo->ldo_mirrors[mirror_idx].lme_end = i;
 659                         continue;
 660                 }
 661
 662                 if (mirror_idx >= 0 && preferred &&
 663                     !lo->ldo_mirrors[mirror_idx].lme_stale)
 664                         found_preferred = true;
 665
 666                 /* new mirror */
 667                 ++mirror_idx;
 668                 if (mirror_idx >= lo->ldo_mirror_count)
 669                         RETURN(-EINVAL);
 670
 671                 if (mirror_hsm && (lod_comp->llc_extent.e_start != 0 ||
 672                                    lod_comp->llc_extent.e_end != LUSTRE_EOF))
 673                         RETURN(-EINVAL);
 674
 675                 mirror_id = mirror_id_of(lod_comp->llc_id);
 676
 677                 lo->ldo_mirrors[mirror_idx].lme_id = mirror_id;
 678                 lo->ldo_mirrors[mirror_idx].lme_stale = stale;
 679                 lo->ldo_mirrors[mirror_idx].lme_prefer = preferred;
 680                 lo->ldo_mirrors[mirror_idx].lme_hsm = mirror_hsm;
 681                 lo->ldo_mirrors[mirror_idx].lme_preference = pref;
 682                 lo->ldo_mirrors[mirror_idx].lme_start = i;
 683                 lo->ldo_mirrors[mirror_idx].lme_end = i;
 684         }
 685         if (mirror_idx != lo->ldo_mirror_count - 1)
 686                 RETURN(-EINVAL);
 687
 688         if (!found_preferred && mirror_idx > 0) {
 689                 int best = -1;
 690
 691                 /*
 692                  * if no explicited preferred found, then find a mirror
 693                  * with higher number of non-rotational OSTs
 694                  * */
 695                 pref = -1;
 696                 for (i = 0; i <= mirror_idx; i++) {
 697                         if (lo->ldo_mirrors[i].lme_stale)
 698                                 continue;
 699                         if (lo->ldo_mirrors[i].lme_preference > pref) {
 700                                 pref = lo->ldo_mirrors[i].lme_preference;
 701                                 best = i;
 702                         }
 703                 }
 704
 705                 LASSERT(best >= 0);
 706                 lo->ldo_mirrors[best].lme_prefer = 1;
 707         }
 708
 709         RETURN(0);
 710 }
 711
 712 /**
 713  * Generate on-disk lov_mds_md structure for each layout component based on
 714  * the information in lod_object->ldo_comp_entries[i].
 715  *
 716  * \param[in] env               execution environment for this thread
 717  * \param[in] lo                LOD object
 718  * \param[in] comp_idx          index of ldo_comp_entries
 719  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 720  * \param[in|out] lmm_size      buffer size/lmm size
 721  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 722  *                              the stripe info is from the default stripe
 723  *                              template, which is collected in lod_ah_init(),
 724  *                              either from parent object or root object; for
 725  *                              file case, it's from the @lo object
 726  *
 727  * \retval                      0 if on disk structure is created successfully
 728  * \retval                      negative error number on failure
 729  */
 730 static int lod_gen_component_ea(const struct lu_env *env,
 731                                 struct lod_object *lo, int comp_idx,
 732                                 struct lov_mds_md *lmm, int *lmm_size,
 733                                 bool is_dir)
 734 {
 735         struct lod_thread_info  *info = lod_env_info(env);
 736         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
 737         struct lod_device       *lod;
 738         struct lov_ost_data_v1  *objs;
 739         struct lod_layout_component *lod_comp;
 740         __u32   magic;
 741         __u16 stripe_count;
 742         int     i, rc = 0;
 743         ENTRY;
 744
 745         LASSERT(lo);
 746         if (is_dir)
 747                 lod_comp =
 748                         &lo->ldo_def_striping->lds_def_comp_entries[comp_idx];
 749         else
 750                 lod_comp = &lo->ldo_comp_entries[comp_idx];
 751
 752         magic = lod_comp->llc_pool != NULL ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
 753         if (lod_comp->llc_pattern == 0) /* default striping */
 754                 lod_comp->llc_pattern = LOV_PATTERN_RAID0;
 755
 756         lmm->lmm_magic = cpu_to_le32(magic);
 757         lmm->lmm_pattern = cpu_to_le32(lod_comp->llc_pattern);
 758         fid_to_lmm_oi(fid, &lmm->lmm_oi);
 759         if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
 760                 lmm->lmm_oi.oi.oi_id++;
 761         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
 762
 763         lmm->lmm_stripe_size = cpu_to_le32(lod_comp->llc_stripe_size);
 764         lmm->lmm_stripe_count = cpu_to_le16(lod_comp->llc_stripe_count);
 765         /**
 766          * for dir and uninstantiated component, lmm_layout_gen stores
 767          * default stripe offset.
 768          */
 769         lmm->lmm_layout_gen =
 770                 (is_dir || !lod_comp_inited(lod_comp)) ?
 771                         cpu_to_le16(lod_comp->llc_stripe_offset) :
 772                         cpu_to_le16(lod_comp->llc_layout_gen);
 773
 774         if (magic == LOV_MAGIC_V1) {
 775                 objs = &lmm->lmm_objects[0];
 776         } else {
 777                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
 778                 size_t cplen = strlcpy(v3->lmm_pool_name,
 779                                        lod_comp->llc_pool,
 780                                        sizeof(v3->lmm_pool_name));
 781                 if (cplen >= sizeof(v3->lmm_pool_name))
 782                         RETURN(-E2BIG);
 783                 objs = &v3->lmm_objects[0];
 784         }
 785         lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 786         stripe_count = lod_comp_entry_stripe_count(lo, comp_idx, is_dir);
 787         if (stripe_count == 0 && !is_dir &&
 788             !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
 789             !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
 790                 /* Try again if all active targets are disconnected.
 791                  * It is possible when MDS does failover. */
 792                 if (!lod->lod_ost_active_count &&
 793                     lod->lod_ost_count)
 794                         RETURN(-EAGAIN);
 795                 RETURN(-E2BIG);
 796         }
 797
 798         if (!is_dir && lo->ldo_is_composite)
 799                 lod_comp_shrink_stripe_count(lod_comp, &stripe_count);
 800
 801         if (is_dir || lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED)
 802                 GOTO(done, rc = 0);
 803
 804         /* generate ost_idx of this component stripe */
 805         for (i = 0; i < stripe_count; i++) {
 806                 struct dt_object *object;
 807                 __u32 ost_idx = (__u32)-1UL;
 808                 int type = LU_SEQ_RANGE_OST;
 809
 810                 if (lod_comp->llc_stripe && lod_comp->llc_stripe[i]) {
 811                         object = lod_comp->llc_stripe[i];
 812                         /* instantiated component */
 813                         info->lti_fid = *lu_object_fid(&object->do_lu);
 814
 815                         if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF) &&
 816                             comp_idx == 0) {
 817                                 if (cfs_fail_val == 0)
 818                                         cfs_fail_val = info->lti_fid.f_oid;
 819                                 else if (i == 0)
 820                                         info->lti_fid.f_oid = cfs_fail_val;
 821                         }
 822
 823                         rc = fid_to_ostid(&info->lti_fid, &info->lti_ostid);
 824                         LASSERT(rc == 0);
 825
 826                         ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 827                         objs[i].l_ost_gen = cpu_to_le32(0);
 828                         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_FLD_LOOKUP))
 829                                 rc = -ENOENT;
 830                         else
 831                                 rc = lod_fld_lookup(env, lod, &info->lti_fid,
 832                                                     &ost_idx, &type);
 833                         if (rc < 0) {
 834                                 CERROR("%s: Can not locate "DFID": rc = %d\n",
 835                                        lod2obd(lod)->obd_name,
 836                                        PFID(&info->lti_fid), rc);
 837                                 RETURN(rc);
 838                         }
 839                 } else if (lod_comp->llc_ostlist.op_array &&
 840                            lod_comp->llc_ostlist.op_count) {
 841                         /* user specified ost list */
 842                         ost_idx = lod_comp->llc_ostlist.op_array[i];
 843                 }
 844                 /*
 845                  * with un-instantiated or with no specified ost list
 846                  * component, its l_ost_idx does not matter.
 847                  */
 848                 objs[i].l_ost_idx = cpu_to_le32(ost_idx);
 849         }
 850 done:
 851         if (lmm_size != NULL)
 852                 *lmm_size = lov_mds_md_size(stripe_count, magic);
 853         RETURN(rc);
 854 }
 855
 856 /**
 857  * Generate on-disk lov_hsm_md structure based on the information in
 858  * the lod_object->ldo_comp_entries.
 859  */
 860 static int lod_gen_component_ea_foreign(const struct lu_env *env,
 861                                         struct lod_object *lo,
 862                                         struct lod_layout_component *lod_comp,
 863                                         void *lmm, int *lmm_size)
 864 {
 865         struct lov_foreign_md *lfm = (struct lov_foreign_md *)lmm;
 866
 867         ENTRY;
 868
 869         lfm->lfm_magic = cpu_to_le32(LOV_MAGIC_FOREIGN);
 870         lfm->lfm_length = cpu_to_le32(lod_comp->llc_length);
 871         lfm->lfm_type = cpu_to_le32(lod_comp->llc_type);
 872         lfm->lfm_flags = cpu_to_le32(lod_comp->llc_foreign_flags);
 873
 874         if (lov_hsm_type_supported(lod_comp->llc_type)) {
 875                 if (lod_comp->llc_length != sizeof(struct lov_hsm_base))
 876                         return -EINVAL;
 877
 878                 lov_foreign_hsm_to_le(lfm, &lod_comp->llc_hsm);
 879         }
 880
 881         if (lmm_size)
 882                 *lmm_size = lov_foreign_md_size(lod_comp->llc_length);
 883
 884         RETURN(0);
 885 }
 886
 887 /**
 888  * Generate on-disk lov_mds_md structure based on the information in
 889  * the lod_object->ldo_comp_entries.
 890  *
 891  * \param[in] env               execution environment for this thread
 892  * \param[in] lo                LOD object
 893  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 894  * \param[in|out] lmm_size      buffer size/lmm size
 895  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 896  *                              the stripe info is from the default stripe
 897  *                              template, which is collected in lod_ah_init(),
 898  *                              either from parent object or root object; for
 899  *                              file case, it's from the @lo object
 900  *
 901  * \retval                      0 if on disk structure is created successfully
 902  * \retval                      negative error number on failure
 903  */
 904 int lod_generate_lovea(const struct lu_env *env, struct lod_object *lo,
 905                        struct lov_mds_md *lmm, int *lmm_size, bool is_dir)
 906 {
 907         struct lov_comp_md_entry_v1 *lcme;
 908         struct lov_comp_md_v1 *lcm;
 909         struct lod_layout_component *comp_entries;
 910         __u16 comp_cnt, mirror_cnt;
 911         bool is_composite, is_foreign = false;
 912         int i, rc = 0, offset;
 913         ENTRY;
 914
 915         if (is_dir) {
 916                 comp_cnt = lo->ldo_def_striping->lds_def_comp_cnt;
 917                 mirror_cnt = lo->ldo_def_striping->lds_def_mirror_cnt;
 918                 comp_entries = lo->ldo_def_striping->lds_def_comp_entries;
 919                 is_composite =
 920                         lo->ldo_def_striping->lds_def_striping_is_composite;
 921         } else {
 922                 comp_cnt = lo->ldo_comp_cnt;
 923                 mirror_cnt = lo->ldo_mirror_count;
 924                 comp_entries = lo->ldo_comp_entries;
 925                 is_composite = lo->ldo_is_composite;
 926                 is_foreign = lo->ldo_is_foreign;
 927         }
 928
 929         LASSERT(lmm_size != NULL);
 930
 931         if (is_foreign) {
 932                 struct lov_foreign_md *lfm;
 933
 934                 lfm = (struct lov_foreign_md *)lmm;
 935                 memcpy(lfm, lo->ldo_foreign_lov, lo->ldo_foreign_lov_size);
 936                 /* need to store little-endian */
 937                 if (cpu_to_le32(LOV_MAGIC_FOREIGN) != LOV_MAGIC_FOREIGN) {
 938                         __swab32s(&lfm->lfm_magic);
 939                         __swab32s(&lfm->lfm_length);
 940                         __swab32s(&lfm->lfm_type);
 941                         __swab32s(&lfm->lfm_flags);
 942                 }
 943                 *lmm_size = lo->ldo_foreign_lov_size;
 944                 RETURN(0);
 945         }
 946
 947         LASSERT(comp_cnt != 0 && comp_entries != NULL);
 948
 949         if (!is_composite) {
 950                 rc = lod_gen_component_ea(env, lo, 0, lmm, lmm_size, is_dir);
 951                 RETURN(rc);
 952         }
 953
 954         lcm = (struct lov_comp_md_v1 *)lmm;
 955         memset(lcm, 0, sizeof(*lcm));
 956
 957         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_COMP_V1);
 958         lcm->lcm_entry_count = cpu_to_le16(comp_cnt);
 959         lcm->lcm_mirror_count = cpu_to_le16(mirror_cnt - 1);
 960         if (mirror_cnt > 1)
 961                 lcm->lcm_flags = cpu_to_le16(lo->ldo_flr_state);
 962         else
 963                 lcm->lcm_flags = LCM_FL_NONE;
 964
 965         offset = sizeof(*lcm) + sizeof(*lcme) * comp_cnt;
 966         LASSERT(offset % sizeof(__u64) == 0);
 967
 968         for (i = 0; i < comp_cnt; i++) {
 969                 struct lod_layout_component *lod_comp;
 970                 struct lov_mds_md *sub_md;
 971                 int size;
 972
 973                 lod_comp = &comp_entries[i];
 974                 lcme = &lcm->lcm_entries[i];
 975
 976                 LASSERT(ergo(!is_dir, lod_comp->llc_id != LCME_ID_INVAL));
 977                 lcme->lcme_id = cpu_to_le32(lod_comp->llc_id);
 978
 979                 /* component could be un-inistantiated */
 980                 lcme->lcme_flags = cpu_to_le32(lod_comp->llc_flags);
 981                 if (lod_comp->llc_flags & LCME_FL_NOSYNC)
 982                         lcme->lcme_timestamp =
 983                                 cpu_to_le64(lod_comp->llc_timestamp);
 984                 if (lod_comp->llc_flags & LCME_FL_EXTENSION && !is_dir)
 985                         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_SEL);
 986
 987                 lcme->lcme_extent.e_start =
 988                         cpu_to_le64(lod_comp->llc_extent.e_start);
 989                 lcme->lcme_extent.e_end =
 990                         cpu_to_le64(lod_comp->llc_extent.e_end);
 991                 lcme->lcme_offset = cpu_to_le32(offset);
 992
 993                 sub_md = (struct lov_mds_md *)((char *)lcm + offset);
 994                 if (lod_comp->llc_magic == LOV_MAGIC_FOREIGN) {
 995                         if (!lov_hsm_type_supported(lod_comp->llc_type)) {
 996                                 CDEBUG(D_LAYOUT, "Unknown HSM type: %u\n",
 997                                        lod_comp->llc_type);
 998                                 GOTO(out, rc = -EINVAL);
 999                         }
1000                         rc = lod_gen_component_ea_foreign(env, lo, lod_comp,
1001                                                           sub_md, &size);
1002                 } else {
1003                         rc = lod_gen_component_ea(env, lo, i, sub_md,
1004                                                   &size, is_dir);
1005                 }
1006                 if (rc)
1007                         GOTO(out, rc);
1008                 lcme->lcme_size = cpu_to_le32(size);
1009                 offset += size;
1010                 LASSERTF((offset <= *lmm_size) && (offset % sizeof(__u64) == 0),
1011                          "offset:%d lmm_size:%d\n", offset, *lmm_size);
1012         }
1013         lcm->lcm_size = cpu_to_le32(offset);
1014         lcm->lcm_layout_gen = cpu_to_le32(is_dir ? 0 : lo->ldo_layout_gen);
1015
1016         lustre_print_user_md(D_LAYOUT, (struct lov_user_md *)lmm,
1017                              "generate lum");
1018 out:
1019         if (rc == 0)
1020                 *lmm_size = offset;
1021         RETURN(rc);
1022 }
1023
1024 /**
1025  * Get LOV EA.
1026  *
1027  * Fill lti_ea_store buffer in the environment with a value for the given
1028  * EA. The buffer is reallocated if the value doesn't fit.
1029  *
1030  * \param[in,out] env           execution environment for this thread
1031  *                              .lti_ea_store buffer is filled with EA's value
1032  * \param[in] lo                LOD object
1033  * \param[in] name              name of the EA
1034  *
1035  * \retval                      > 0 if EA is fetched successfully
1036  * \retval                      0 if EA is empty
1037  * \retval                      negative error number on failure
1038  */
1039 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
1040                const char *name)
1041 {
1042         struct lod_thread_info  *info = lod_env_info(env);
1043         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
1044         int rc, count = 0;
1045         ENTRY;
1046
1047         LASSERT(info);
1048
1049         if (unlikely(info->lti_ea_store == NULL)) {
1050                 /* just to enter in allocation block below */
1051                 rc = -ERANGE;
1052         } else {
1053 repeat:
1054                 info->lti_buf.lb_buf = info->lti_ea_store;
1055                 info->lti_buf.lb_len = info->lti_ea_store_size;
1056                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
1057         }
1058
1059         /* if object is not striped or inaccessible */
1060         if (rc == -ENODATA || rc == -ENOENT)
1061                 RETURN(0);
1062
1063         if (rc == -ERANGE) {
1064                 /* EA doesn't fit, reallocate new buffer */
1065                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
1066                 if (rc == -ENODATA || rc == -ENOENT)
1067                         RETURN(0);
1068                 else if (rc < 0)
1069                         RETURN(rc);
1070
1071                 LASSERT(rc > 0);
1072                 if (rc <= info->lti_ea_store_size) {
1073                         /* sometimes LOVEA can shrink in parallel */
1074                         LASSERT(count++ < 10);
1075                         goto repeat;
1076                 }
1077                 rc = lod_ea_store_resize(info, rc);
1078                 if (rc)
1079                         RETURN(rc);
1080                 goto repeat;
1081         }
1082
1083         RETURN(rc);
1084 }
1085
1086 /**
1087  * Verify the target index is present in the current configuration.
1088  *
1089  * \param[in] md                LOD device where the target table is stored
1090  * \param[in] idx               target's index
1091  *
1092  * \retval                      0 if the index is present
1093  * \retval                      -EINVAL if not
1094  */
1095 int validate_lod_and_idx(struct lod_device *md, __u32 idx)
1096 {
1097         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
1098                      !test_bit(idx, md->lod_ost_bitmap))) {
1099                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
1100                        md->lod_ost_descs.ltd_tgts_size);
1101                 return -EINVAL;
1102         }
1103
1104         if (unlikely(OST_TGT(md, idx) == NULL)) {
1105                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
1106                        lod2obd(md)->obd_name, idx);
1107                 return -EINVAL;
1108         }
1109
1110         if (unlikely(OST_TGT(md, idx)->ltd_tgt == NULL)) {
1111                 CERROR("%s: invalid lod device, for idx: %d\n",
1112                        lod2obd(md)->obd_name , idx);
1113                 return -EINVAL;
1114         }
1115
1116         return 0;
1117 }
1118
1119 /**
1120  * Instantiate objects for stripes.
1121  *
1122  * Allocate and initialize LU-objects representing the stripes. The number
1123  * of the stripes (llc_stripe_count) must be initialized already. The caller
1124  * must ensure nobody else is calling the function on the object at the same
1125  * time. FLDB service must be running to be able to map a FID to the targets
1126  * and find appropriate device representing that target.
1127  *
1128  * \param[in] env               execution environment for this thread
1129  * \param[in,out] lo            LOD object
1130  * \param[in] objs              an array of IDs to creates the objects from
1131  * \param[in] comp_idx          index of ldo_comp_entries
1132  *
1133  * \retval                      0 if the objects are instantiated successfully
1134  * \retval                      negative error number on failure
1135  */
1136 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
1137                            struct lov_ost_data_v1 *objs, int comp_idx)
1138 {
1139         struct lod_layout_component *lod_comp;
1140         struct lod_thread_info *info = lod_env_info(env);
1141         struct lod_device *md;
1142         struct lu_object *o, *n;
1143         struct lu_device *nd;
1144         struct dt_object **stripe = NULL;
1145         __u32 *ost_indices = NULL;
1146         int stripe_len;
1147         int i, rc = 0;
1148         __u32 idx;
1149         ENTRY;
1150
1151         LASSERT(lo != NULL);
1152         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1153
1154         LASSERT(lo->ldo_comp_cnt != 0 && lo->ldo_comp_entries != NULL);
1155         lod_comp = &lo->ldo_comp_entries[comp_idx];
1156
1157         LASSERT(lod_comp->llc_stripe == NULL);
1158         LASSERT(lod_comp->llc_stripe_count > 0);
1159         LASSERT(lod_comp->llc_stripe_size > 0);
1160
1161         stripe_len = lod_comp->llc_stripe_count;
1162         OBD_ALLOC_PTR_ARRAY(stripe, stripe_len);
1163         if (stripe == NULL)
1164                 RETURN(-ENOMEM);
1165         OBD_ALLOC_PTR_ARRAY(ost_indices, stripe_len);
1166         if (!ost_indices)
1167                 GOTO(out, rc = -ENOMEM);
1168
1169         for (i = 0; i < lod_comp->llc_stripe_count; i++) {
1170                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
1171                         continue;
1172
1173                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
1174                 idx = le32_to_cpu(objs[i].l_ost_idx);
1175                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
1176                 if (rc != 0)
1177                         GOTO(out, rc);
1178                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
1179                          PFID(&info->lti_fid));
1180                 lod_getref(&md->lod_ost_descs);
1181
1182                 rc = validate_lod_and_idx(md, idx);
1183                 if (unlikely(rc != 0)) {
1184                         lod_putref(md, &md->lod_ost_descs);
1185                         GOTO(out, rc);
1186                 }
1187
1188                 nd = &OST_TGT(md, idx)->ltd_tgt->dd_lu_dev;
1189                 lod_putref(md, &md->lod_ost_descs);
1190
1191                 /* In the function below, .hs_keycmp resolves to
1192                  * u_obj_hop_keycmp() */
1193                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
1194                 if (IS_ERR(o))
1195                         GOTO(out, rc = PTR_ERR(o));
1196
1197                 n = lu_object_locate(o->lo_header, nd->ld_type);
1198                 LASSERT(n);
1199
1200                 stripe[i] = container_of(n, struct dt_object, do_lu);
1201                 ost_indices[i] = idx;
1202         }
1203
1204 out:
1205         if (rc != 0) {
1206                 for (i = 0; i < stripe_len; i++)
1207                         if (stripe[i] != NULL)
1208                                 dt_object_put(env, stripe[i]);
1209
1210                 OBD_FREE_PTR_ARRAY(stripe, stripe_len);
1211                 lod_comp->llc_stripe_count = 0;
1212                 if (ost_indices)
1213                         OBD_FREE_PTR_ARRAY(ost_indices, stripe_len);
1214         } else {
1215                 lod_comp->llc_stripe = stripe;
1216                 lod_comp->llc_ost_indices = ost_indices;
1217                 lod_comp->llc_stripes_allocated = stripe_len;
1218         }
1219
1220         RETURN(rc);
1221 }
1222
1223 int lod_init_comp_foreign(struct lod_layout_component *lod_comp, void *lmm)
1224 {
1225         struct lov_foreign_md *lfm;
1226
1227         lfm = (struct lov_foreign_md *)lmm;
1228         lod_comp->llc_length = le32_to_cpu(lfm->lfm_length);
1229         lod_comp->llc_type = le32_to_cpu(lfm->lfm_type);
1230
1231         if (!lov_hsm_type_supported(lod_comp->llc_type)) {
1232                 CDEBUG(D_LAYOUT,
1233                        "Unsupport HSM type: %u length: %u flags: %08X\n",
1234                        lod_comp->llc_type, lod_comp->llc_length,
1235                        le32_to_cpu(lfm->lfm_flags));
1236                 return -EINVAL;
1237         }
1238
1239         /*
1240          * Currently it only stores the file FID as the field @lhm_archive_uuid
1241          * which is used to be the identifier within HSM backend for the archive
1242          * copy.
1243          * Thus the length of foreign layout value (HSM is a kind of foreign
1244          * layout type) is: sizeof(lhm_archive_id) + sizeof(lhm_archive_ver) +
1245          *                  UUID_MAX
1246          * It should fix to support other kinds of identifier for different HSM
1247          * solutions such as S3.
1248          */
1249         if (lod_comp->llc_length != sizeof(struct lov_hsm_base)) {
1250                 CDEBUG(D_LAYOUT, "Invalid HSM len: %u, should be %zu\n",
1251                        lod_comp->llc_length, sizeof(struct lov_hsm_base));
1252                 return -EINVAL;
1253         }
1254
1255         lod_comp->llc_foreign_flags = le32_to_cpu(lfm->lfm_flags);
1256         lov_foreign_hsm_to_cpu(&lod_comp->llc_hsm, lfm);
1257         return 0;
1258 }
1259
1260 /**
1261  * Instantiate objects for striping.
1262  *
1263  * Parse striping information in \a buf and instantiate the objects
1264  * representing the stripes.
1265  *
1266  * \param[in] env               execution environment for this thread
1267  * \param[in] lo                LOD object
1268  * \param[in] buf               buffer storing LOV EA to parse
1269  * \param[in] lvf               verify flags when parsing the layout
1270  *
1271  * \retval                      0 if parsing and objects creation succeed
1272  * \retval                      negative error number on failure
1273  */
1274 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
1275                        const struct lu_buf *buf, enum layout_verify_flags lvf)
1276 {
1277         struct lod_device *d = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1278         struct lov_mds_md_v1 *lmm;
1279         struct lov_comp_md_v1 *comp_v1 = NULL;
1280         struct lov_foreign_md *foreign = NULL;
1281         struct lov_ost_data_v1 *objs;
1282         __u32 magic, pattern;
1283         __u16 mirror_cnt = 0;
1284         __u16 comp_cnt;
1285         __u64 dom_size = 0;
1286         int i, rc;
1287         __u16 mirror_id = MIRROR_ID_NEG;
1288         bool stale = false;
1289         int stale_mirrors = 0;
1290         ENTRY;
1291
1292         LASSERT(buf);
1293         LASSERT(buf->lb_buf);
1294         LASSERT(buf->lb_len);
1295         LASSERT(mutex_is_locked(&lo->ldo_layout_mutex));
1296
1297         lmm = (struct lov_mds_md_v1 *)buf->lb_buf;
1298         magic = le32_to_cpu(lmm->lmm_magic);
1299
1300         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3 &&
1301             magic != LOV_MAGIC_COMP_V1 && magic != LOV_MAGIC_FOREIGN &&
1302             magic != LOV_MAGIC_SEL)
1303                 GOTO(out, rc = -EINVAL);
1304
1305         lod_striping_free_nolock(env, lo);
1306
1307         if (magic == LOV_MAGIC_COMP_V1 || magic == LOV_MAGIC_SEL) {
1308                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
1309                 comp_cnt = le16_to_cpu(comp_v1->lcm_entry_count);
1310                 if (comp_cnt == 0)
1311                         GOTO(out, rc = -EINVAL);
1312                 lo->ldo_layout_gen = le32_to_cpu(comp_v1->lcm_layout_gen);
1313                 lo->ldo_is_composite = 1;
1314                 mirror_cnt = le16_to_cpu(comp_v1->lcm_mirror_count) + 1;
1315                 if (mirror_cnt > 1)
1316                         lo->ldo_flr_state = le16_to_cpu(comp_v1->lcm_flags) &
1317                                                         LCM_FL_FLR_MASK;
1318                 else
1319                         lo->ldo_flr_state = LCM_FL_NONE;
1320         } else if (magic == LOV_MAGIC_FOREIGN) {
1321                 size_t length;
1322
1323                 foreign = (struct lov_foreign_md *)buf->lb_buf;
1324                 length = offsetof(typeof(*foreign), lfm_value);
1325                 if (buf->lb_len < length ||
1326                     buf->lb_len < (length + le32_to_cpu(foreign->lfm_length))) {
1327                         CDEBUG(D_LAYOUT,
1328                                "buf len %zu too small for lov_foreign_md\n",
1329                                buf->lb_len);
1330                         GOTO(out, rc = -EINVAL);
1331                 }
1332
1333                 /* just cache foreign LOV EA raw */
1334                 rc = lod_alloc_foreign_lov(lo, length);
1335                 if (rc)
1336                         GOTO(out, rc);
1337                 memcpy(lo->ldo_foreign_lov, buf->lb_buf, length);
1338                 GOTO(out, rc);
1339         } else {
1340                 comp_cnt = 1;
1341                 lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1342                 lo->ldo_is_composite = 0;
1343         }
1344
1345         rc = lod_alloc_comp_entries(lo, mirror_cnt, comp_cnt);
1346         if (rc)
1347                 GOTO(out, rc);
1348
1349         for (i = 0; i < comp_cnt; i++) {
1350                 struct lod_layout_component *lod_comp;
1351                 struct lu_extent *ext;
1352                 __u32 offs;
1353
1354                 lod_comp = &lo->ldo_comp_entries[i];
1355                 if (lo->ldo_is_composite) {
1356                         offs = le32_to_cpu(comp_v1->lcm_entries[i].lcme_offset);
1357                         lmm = (struct lov_mds_md_v1 *)((char *)comp_v1 + offs);
1358
1359                         ext = &comp_v1->lcm_entries[i].lcme_extent;
1360                         lod_comp->llc_extent.e_start =
1361                                 le64_to_cpu(ext->e_start);
1362                         if (lod_comp->llc_extent.e_start &
1363                             (LOV_MIN_STRIPE_SIZE - 1)) {
1364                                 CDEBUG(D_LAYOUT,
1365                                        "extent start %llu is not a multiple of min size %u\n",
1366                                        lod_comp->llc_extent.e_start,
1367                                        LOV_MIN_STRIPE_SIZE);
1368                                 GOTO(out, rc = -EINVAL);
1369                         }
1370
1371                         lod_comp->llc_extent.e_end = le64_to_cpu(ext->e_end);
1372                         if (lod_comp->llc_extent.e_end != LUSTRE_EOF &&
1373                             lod_comp->llc_extent.e_end &
1374                             (LOV_MIN_STRIPE_SIZE - 1)) {
1375                                 CDEBUG(D_LAYOUT,
1376                                        "extent end %llu is not a multiple of min size %u\n",
1377                                        lod_comp->llc_extent.e_end,
1378                                        LOV_MIN_STRIPE_SIZE);
1379                                 GOTO(out, rc = -EINVAL);
1380                         }
1381
1382                         lod_comp->llc_flags =
1383                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_flags);
1384
1385                         if (lod_comp->llc_flags & LCME_FL_NOSYNC)
1386                                 lod_comp->llc_timestamp = le64_to_cpu(
1387                                         comp_v1->lcm_entries[i].lcme_timestamp);
1388                         lod_comp->llc_id =
1389                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_id);
1390                         if (lod_comp->llc_id == LCME_ID_INVAL)
1391                                 GOTO(out, rc = -EINVAL);
1392
1393                         if (lvf & LVF_ALL_STALE) {
1394                                 if (mirror_id_of(lod_comp->llc_id) ==
1395                                     mirror_id) {
1396                                         /* remaining comps in the mirror */
1397                                         stale |= lod_comp->llc_flags &
1398                                                  LCME_FL_STALE;
1399                                 } else {
1400                                         /*
1401                                          * new mirror, check last mirror's
1402                                          * stale-ness
1403                                          */
1404                                         if (stale)
1405                                                 stale_mirrors++;
1406
1407                                         mirror_id =
1408                                                 mirror_id_of(lod_comp->llc_id);
1409
1410                                         /* the first comp of the new mirror */
1411                                         stale = lod_comp->llc_flags &
1412                                                 LCME_FL_STALE;
1413                                 }
1414                         }
1415
1416                         if ((lod_comp->llc_flags & LCME_FL_EXTENSION) &&
1417                             comp_v1->lcm_magic != cpu_to_le32(LOV_MAGIC_SEL)) {
1418                                 CWARN("%s: EXTENSION flags=%x set on component[%u]=%x of non-SEL file "DFID" with magic=%#08x\n",
1419                                       lod2obd(d)->obd_name,
1420                                       lod_comp->llc_flags, lod_comp->llc_id, i,
1421                                       PFID(lod_object_fid(lo)),
1422                                       le32_to_cpu(comp_v1->lcm_magic));
1423                         }
1424
1425                         lod_comp->llc_magic = le32_to_cpu(lmm->lmm_magic);
1426                         if (lod_comp->llc_magic == LOV_MAGIC_FOREIGN) {
1427                                 rc = lod_init_comp_foreign(lod_comp, lmm);
1428                                 if (rc)
1429                                         GOTO(out, rc);
1430                                 continue;
1431                         }
1432                 } else {
1433                         lod_comp->llc_magic = le32_to_cpu(lmm->lmm_magic);
1434                         lod_comp_set_init(lod_comp);
1435                 }
1436
1437                 pattern = le32_to_cpu(lmm->lmm_pattern);
1438                 if (!lov_pattern_supported(lov_pattern(pattern)))
1439                         GOTO(out, rc = -EINVAL);
1440
1441                 if (pattern & LOV_PATTERN_MDT) {
1442                         if (lod_comp->llc_extent.e_start != 0) {
1443                                 CERROR("%s: DOM entry must be the first stripe "
1444                                        "in a mirror\n", lod2obd(d)->obd_name);
1445                                 GOTO(out, rc = -EINVAL);
1446                         }
1447                         if (!dom_size) {
1448                                 dom_size = lod_comp->llc_extent.e_end;
1449                         } else if (dom_size != lod_comp->llc_extent.e_end) {
1450                                 CERROR("%s: DOM entries with different sizes "
1451                                        "%#llx/%#llx\n", lod2obd(d)->obd_name,
1452                                        dom_size, lod_comp->llc_extent.e_end);
1453                                 GOTO(out, rc = -EINVAL);
1454                         }
1455                 }
1456
1457                 lod_comp->llc_pattern = pattern;
1458                 lod_comp->llc_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
1459                 lod_comp->llc_stripe_count = le16_to_cpu(lmm->lmm_stripe_count);
1460                 lod_comp->llc_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1461
1462                 if (lmm->lmm_magic == cpu_to_le32(LOV_MAGIC_V3)) {
1463                         struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
1464
1465                         lod_set_pool(&lod_comp->llc_pool, v3->lmm_pool_name);
1466                         objs = &v3->lmm_objects[0];
1467                 } else {
1468                         lod_set_pool(&lod_comp->llc_pool, NULL);
1469                         objs = &lmm->lmm_objects[0];
1470                 }
1471
1472                 /**
1473                  * If uninstantiated template component has valid l_ost_idx,
1474                  * then user has specified ost list for this component.
1475                  */
1476                 if (!lod_comp_inited(lod_comp)) {
1477                         __u16 stripe_count;
1478
1479                         if (objs[0].l_ost_idx != (__u32)-1UL) {
1480                                 int j;
1481
1482                                 stripe_count = lod_comp_entry_stripe_count(
1483                                                         lo, i, false);
1484                                 if (stripe_count == 0 &&
1485                                     !(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1486                                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT))
1487                                         GOTO(out, rc = -E2BIG);
1488                                 /**
1489                                  * load the user specified ost list, when this
1490                                  * component is instantiated later, it will be
1491                                  * used in lod_alloc_ost_list().
1492                                  */
1493                                 lod_comp->llc_ostlist.op_count = stripe_count;
1494                                 lod_comp->llc_ostlist.op_size =
1495                                         stripe_count * sizeof(__u32);
1496                                 OBD_ALLOC(lod_comp->llc_ostlist.op_array,
1497                                           lod_comp->llc_ostlist.op_size);
1498                                 if (!lod_comp->llc_ostlist.op_array)
1499                                         GOTO(out, rc = -ENOMEM);
1500
1501                                 for (j = 0; j < stripe_count; j++)
1502                                         lod_comp->llc_ostlist.op_array[j] =
1503                                                 le32_to_cpu(objs[j].l_ost_idx);
1504
1505                                 /**
1506                                  * this component OST objects starts from the
1507                                  * first ost_idx, lod_alloc_ost_list() will
1508                                  * check this.
1509                                  */
1510                                 lod_comp->llc_stripe_offset = objs[0].l_ost_idx;
1511                         } else {
1512                                 /**
1513                                  * for uninstantiated component,
1514                                  * lmm_layout_gen stores default stripe offset.
1515                                  */
1516                                 lod_comp->llc_stripe_offset =
1517                                                         lmm->lmm_layout_gen;
1518                         }
1519                 }
1520
1521                 /* skip un-instantiated component object initialization */
1522                 if (!lod_comp_inited(lod_comp))
1523                         continue;
1524
1525                 if (!(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED) &&
1526                     !(lod_comp->llc_pattern & LOV_PATTERN_MDT)) {
1527                         rc = lod_initialize_objects(env, lo, objs, i);
1528                         if (rc)
1529                                 GOTO(out, rc);
1530                 }
1531         }
1532
1533         if (lo->ldo_is_composite && (lvf & LVF_ALL_STALE)) {
1534                 /* check the last mirror stale-ness */
1535                 if (stale)
1536                         stale_mirrors++;
1537
1538                 if (mirror_cnt == stale_mirrors) {
1539                         rc = -EPERM;
1540                         CERROR("%s: can not set all stale mirrors for "
1541                                DFID": rc = %d\n",
1542                                lod2obd(d)->obd_name, PFID(lod_object_fid(lo)),
1543                                rc);
1544                         GOTO(out, rc);
1545                 }
1546         }
1547
1548         rc = lod_fill_mirrors(lo);
1549         if (rc)
1550                 GOTO(out, rc);
1551
1552 out:
1553         if (rc)
1554                 lod_striping_free_nolock(env, lo);
1555         RETURN(rc);
1556 }
1557
1558 /**
1559  * Check whether the striping (LOVEA for regular file, LMVEA for directory)
1560  * is already cached.
1561  *
1562  * \param[in] lo        LOD object
1563  *
1564  * \retval              True if the striping is cached, otherwise
1565  *                      return false.
1566  */
1567 static bool lod_striping_loaded(struct lod_object *lo)
1568 {
1569         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1570             lo->ldo_comp_cached)
1571                 return true;
1572
1573         if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1574                 if (lo->ldo_dir_stripe_loaded)
1575                         return true;
1576
1577                 /* Never load LMV stripe for slaves of striped dir */
1578                 if (lo->ldo_dir_slave_stripe)
1579                         return true;
1580         }
1581
1582         return false;
1583 }
1584
1585 /**
1586  * A generic function to initialize the stripe objects.
1587  *
1588  * A protected version of lod_striping_load_locked() - load the striping
1589  * information from storage, parse that and instantiate LU objects to
1590  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1591  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1592  * return an array of references to the newly instantiated objects.
1593  *
1594  * \param[in] env               execution environment for this thread
1595  * \param[in,out] lo            LOD object, where striping is stored and
1596  *                              which gets an array of references
1597  *
1598  * \retval                      0 if parsing and object creation succeed
1599  * \retval                      negative error number on failure
1600  **/
1601 int lod_striping_load(const struct lu_env *env, struct lod_object *lo)
1602 {
1603         struct lod_thread_info *info = lod_env_info(env);
1604         struct dt_object *next = dt_object_child(&lo->ldo_obj);
1605         struct lu_buf *buf = &info->lti_buf;
1606         int rc = 0;
1607
1608         ENTRY;
1609
1610         if (!dt_object_exists(next))
1611                 RETURN(0);
1612
1613         if (lod_striping_loaded(lo))
1614                 RETURN(0);
1615
1616         mutex_lock(&lo->ldo_layout_mutex);
1617         if (lod_striping_loaded(lo))
1618                 GOTO(unlock, rc = 0);
1619
1620         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr)) {
1621                 rc = lod_get_lov_ea(env, lo);
1622                 if (rc <= 0)
1623                         GOTO(unlock, rc);
1624
1625                 /*
1626                  * there is LOV EA (striping information) in this object
1627                  * let's parse it and create in-core objects for the stripes
1628                  */
1629                 buf->lb_buf = info->lti_ea_store;
1630                 buf->lb_len = info->lti_ea_store_size;
1631                 rc = lod_parse_striping(env, lo, buf, 0);
1632                 if (rc == 0)
1633                         lo->ldo_comp_cached = 1;
1634         } else if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1635                 rc = lod_get_lmv_ea(env, lo);
1636
1637                 if (rc > (int)sizeof(struct lmv_foreign_md)) {
1638                         struct lmv_foreign_md *lfm = info->lti_ea_store;
1639
1640                         if (le32_to_cpu(lfm->lfm_magic) == LMV_MAGIC_FOREIGN) {
1641                                 lo->ldo_foreign_lmv = info->lti_ea_store;
1642                                 lo->ldo_foreign_lmv_size =
1643                                         info->lti_ea_store_size;
1644                                 info->lti_ea_store = NULL;
1645                                 info->lti_ea_store_size = 0;
1646
1647                                 lo->ldo_dir_stripe_loaded = 1;
1648                                 lo->ldo_is_foreign = 1;
1649                                 GOTO(unlock, rc = 0);
1650                         }
1651                 }
1652
1653                 if (rc < (int)sizeof(struct lmv_mds_md_v1)) {
1654                         /* Let's set stripe_loaded to avoid further
1655                          * stripe loading especially for non-stripe directory,
1656                          * which can hurt performance. (See LU-9840)
1657                          */
1658                         if (rc == 0)
1659                                 lo->ldo_dir_stripe_loaded = 1;
1660                         GOTO(unlock, rc = rc > 0 ? -EINVAL : rc);
1661                 }
1662                 buf->lb_buf = info->lti_ea_store;
1663                 buf->lb_len = info->lti_ea_store_size;
1664                 if (rc == sizeof(struct lmv_mds_md_v1)) {
1665                         rc = lod_load_lmv_shards(env, lo, buf, true);
1666                         if (buf->lb_buf != info->lti_ea_store) {
1667                                 OBD_FREE_LARGE(info->lti_ea_store,
1668                                                info->lti_ea_store_size);
1669                                 info->lti_ea_store = buf->lb_buf;
1670                                 info->lti_ea_store_size = buf->lb_len;
1671                         }
1672
1673                         if (rc < 0)
1674                                 GOTO(unlock, rc);
1675                 }
1676
1677                 /*
1678                  * there is LMV EA (striping information) in this object
1679                  * let's parse it and create in-core objects for the stripes
1680                  */
1681                 rc = lod_parse_dir_striping(env, lo, buf);
1682                 if (rc == 0)
1683                         lo->ldo_dir_stripe_loaded = 1;
1684         }
1685         EXIT;
1686 unlock:
1687         mutex_unlock(&lo->ldo_layout_mutex);
1688
1689         return rc;
1690 }
1691
1692 int lod_striping_reload(const struct lu_env *env, struct lod_object *lo,
1693                         const struct lu_buf *buf, enum layout_verify_flags lvf)
1694 {
1695         int rc;
1696
1697         ENTRY;
1698
1699         mutex_lock(&lo->ldo_layout_mutex);
1700         rc = lod_parse_striping(env, lo, buf, lvf);
1701         mutex_unlock(&lo->ldo_layout_mutex);
1702
1703         RETURN(rc);
1704 }
1705
1706 /**
1707  * Verify lov_user_md_v1/v3 striping.
1708  *
1709  * Check the validity of all fields including the magic, stripe size,
1710  * stripe count, stripe offset and that the pool is present.  Also check
1711  * that each target index points to an existing target. The additional
1712  * \a is_from_disk turns additional checks. In some cases zero fields
1713  * are allowed (like pattern=0).
1714  *
1715  * \param[in] d                 LOD device
1716  * \param[in] buf               buffer with LOV EA to verify
1717  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1718  *                              1 - from disk, do not allow
1719  *
1720  * \retval                      0 if the striping is valid
1721  * \retval                      -EINVAL if striping is invalid
1722  */
1723 static int lod_verify_v1v3(struct lod_device *d, const struct lu_buf *buf,
1724                            bool is_from_disk)
1725 {
1726         struct lov_user_md_v1   *lum;
1727         struct lov_user_md_v3   *lum3;
1728         struct lod_pool_desc    *pool = NULL;
1729         __u32                    magic;
1730         __u32                    stripe_size;
1731         __u16                    stripe_count;
1732         __u16                    stripe_offset;
1733         size_t                   lum_size;
1734         int                      rc = 0;
1735         ENTRY;
1736
1737         lum = buf->lb_buf;
1738
1739         if (buf->lb_len < sizeof(*lum)) {
1740                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1741                        buf->lb_len);
1742                 GOTO(out, rc = -EINVAL);
1743         }
1744
1745         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
1746         if (magic != LOV_USER_MAGIC_V1 &&
1747             magic != LOV_USER_MAGIC_V3 &&
1748             magic != LOV_USER_MAGIC_SPECIFIC) {
1749                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1750                        le32_to_cpu(lum->lmm_magic));
1751                 GOTO(out, rc = -EINVAL);
1752         }
1753
1754         /* the user uses "0" for default stripe pattern normally. */
1755         if (!is_from_disk && lum->lmm_pattern == LOV_PATTERN_NONE)
1756                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1757
1758         if (!lov_pattern_supported(le32_to_cpu(lum->lmm_pattern))) {
1759                 CDEBUG(D_LAYOUT, "bad userland stripe pattern: %#x\n",
1760                        le32_to_cpu(lum->lmm_pattern));
1761                 GOTO(out, rc = -EINVAL);
1762         }
1763
1764         /* a released lum comes from creating orphan on hsm release,
1765          * doesn't make sense to verify it. */
1766         if (le32_to_cpu(lum->lmm_pattern) & LOV_PATTERN_F_RELEASED)
1767                 GOTO(out, rc = 0);
1768
1769         /* 64kB is the largest common page size we see (ia64), and matches the
1770          * check in lfs */
1771         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1772         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1773                 CDEBUG(D_LAYOUT, "stripe size %u not a multiple of %u\n",
1774                        stripe_size, LOV_MIN_STRIPE_SIZE);
1775                 GOTO(out, rc = -EINVAL);
1776         }
1777
1778         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1779         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT &&
1780             !(lov_pattern(le32_to_cpu(lum->lmm_pattern)) & LOV_PATTERN_MDT)) {
1781                 /* if offset is not within valid range [0, osts_size) */
1782                 if (stripe_offset >= d->lod_ost_descs.ltd_tgts_size) {
1783                         CDEBUG(D_LAYOUT, "stripe offset %u >= bitmap size %u\n",
1784                                stripe_offset, d->lod_ost_descs.ltd_tgts_size);
1785                         GOTO(out, rc = -EINVAL);
1786                 }
1787
1788                 /* if lmm_stripe_offset is *not* in bitmap */
1789                 if (!test_bit(stripe_offset, d->lod_ost_bitmap)) {
1790                         CDEBUG(D_LAYOUT, "stripe offset %u not in bitmap\n",
1791                                stripe_offset);
1792                         GOTO(out, rc = -EINVAL);
1793                 }
1794         }
1795
1796         if (magic == LOV_USER_MAGIC_V1)
1797                 lum_size = offsetof(struct lov_user_md_v1,
1798                                     lmm_objects[0]);
1799         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC)
1800                 lum_size = offsetof(struct lov_user_md_v3,
1801                                     lmm_objects[0]);
1802         else
1803                 GOTO(out, rc = -EINVAL);
1804
1805         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1806         if (buf->lb_len < lum_size) {
1807                 CDEBUG(D_LAYOUT, "invalid buf len %zu/%zu for lov_user_md with "
1808                        "magic %#x and stripe_count %u\n",
1809                        buf->lb_len, lum_size, magic, stripe_count);
1810                 GOTO(out, rc = -EINVAL);
1811         }
1812
1813         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC))
1814                 goto out;
1815
1816         lum3 = buf->lb_buf;
1817         /* In the function below, .hs_keycmp resolves to
1818          * pool_hashkey_keycmp() */
1819         pool = lod_find_pool(d, lum3->lmm_pool_name);
1820         if (pool == NULL)
1821                 goto out;
1822
1823         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT) {
1824                 rc = lod_check_index_in_pool(stripe_offset, pool);
1825                 if (rc < 0)
1826                         GOTO(out, rc = -EINVAL);
1827         }
1828
1829         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1830                 CDEBUG(D_LAYOUT, "stripe count %u > # OSTs %u in the pool\n",
1831                        stripe_count, pool_tgt_count(pool));
1832                 GOTO(out, rc = -EINVAL);
1833         }
1834
1835 out:
1836         if (pool != NULL)
1837                 lod_pool_putref(pool);
1838
1839         RETURN(rc);
1840 }
1841
1842 static inline
1843 struct lov_comp_md_entry_v1 *comp_entry_v1(struct lov_comp_md_v1 *comp, int i)
1844 {
1845         LASSERTF((le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1846                  LOV_USER_MAGIC_COMP_V1 ||
1847                  (le32_to_cpu(comp->lcm_magic) & ~LOV_MAGIC_DEFINED) ==
1848                  LOV_USER_MAGIC_SEL, "Wrong magic %x\n",
1849                  le32_to_cpu(comp->lcm_magic));
1850         LASSERTF(i >= 0 && i < le16_to_cpu(comp->lcm_entry_count),
1851                  "bad index %d, max = %d\n",
1852                  i, le16_to_cpu(comp->lcm_entry_count));
1853
1854         return &comp->lcm_entries[i];
1855 }
1856
1857 #define for_each_comp_entry_v1(comp, entry) \
1858         for (entry = comp_entry_v1(comp, 0); \
1859              entry <= comp_entry_v1(comp, \
1860                                    le16_to_cpu(comp->lcm_entry_count) - 1); \
1861              entry++)
1862
1863 int lod_erase_dom_stripe(struct lov_comp_md_v1 *comp_v1,
1864                          struct lov_comp_md_entry_v1 *dom_ent)
1865 {
1866         struct lov_comp_md_entry_v1 *ent;
1867         __u16 entries;
1868         __u32 dom_off, dom_size, comp_size, off;
1869         void *src, *dst;
1870         unsigned int size, shift;
1871
1872         entries = le16_to_cpu(comp_v1->lcm_entry_count) - 1;
1873         LASSERT(entries > 0);
1874         comp_v1->lcm_entry_count = cpu_to_le16(entries);
1875
1876         comp_size = le32_to_cpu(comp_v1->lcm_size);
1877         dom_off = le32_to_cpu(dom_ent->lcme_offset);
1878         dom_size = le32_to_cpu(dom_ent->lcme_size);
1879
1880         /* all entries offsets are shifted by entry size at least */
1881         shift = sizeof(*dom_ent);
1882         for_each_comp_entry_v1(comp_v1, ent) {
1883                 off = le32_to_cpu(ent->lcme_offset);
1884                 if (off == dom_off) {
1885                         /* Entry deletion creates two holes in layout data:
1886                          * - hole in entries array
1887                          * - hole in layout data at dom_off with dom_size
1888                          *
1889                          * First memmove is one entry shift from next entry
1890                          * start with size up to dom_off in blob
1891                          */
1892                         dst = (void *)ent;
1893                         src = (void *)(ent + 1);
1894                         size = (unsigned long)((void *)comp_v1 + dom_off - src);
1895                         memmove(dst, src, size);
1896                         /* take 'off' from just moved entry */
1897                         off = le32_to_cpu(ent->lcme_offset);
1898                         /* second memmove is blob tail after 'off' up to
1899                          * component end
1900                          */
1901                         dst = (void *)comp_v1 + dom_off - sizeof(*ent);
1902                         src = (void *)comp_v1 + off;
1903                         size = (unsigned long)(comp_size - off);
1904                         memmove(dst, src, size);
1905                         /* all entries offsets after DoM entry are shifted by
1906                          * dom_size additionally
1907                          */
1908                         shift += dom_size;
1909                 }
1910                 ent->lcme_offset = cpu_to_le32(off - shift);
1911         }
1912         comp_v1->lcm_size = cpu_to_le32(comp_size - shift);
1913
1914         /* notify a caller to re-check entry */
1915         return -ERESTART;
1916 }
1917
1918 void lod_dom_stripesize_recalc(struct lod_device *d)
1919 {
1920         __u64 threshold_mb = d->lod_dom_threshold_free_mb;
1921         __u32 max_size = d->lod_dom_stripesize_max_kb;
1922         __u32 def_size = d->lod_dom_stripesize_cur_kb;
1923
1924         /* use maximum allowed value if free space is above threshold */
1925         if (d->lod_lsfs_free_mb >= threshold_mb) {
1926                 def_size = max_size;
1927         } else if (!d->lod_lsfs_free_mb || max_size <= LOD_DOM_MIN_SIZE_KB) {
1928                 def_size = 0;
1929         } else {
1930                 /* recalc threshold like it would be with def_size as max */
1931                 threshold_mb = mult_frac(threshold_mb, def_size, max_size);
1932                 if (d->lod_lsfs_free_mb < threshold_mb)
1933                         def_size = rounddown(def_size / 2, LOD_DOM_MIN_SIZE_KB);
1934                 else if (d->lod_lsfs_free_mb > threshold_mb * 2)
1935                         def_size = max_t(unsigned int, def_size * 2,
1936                                          LOD_DOM_MIN_SIZE_KB);
1937         }
1938
1939         if (d->lod_dom_stripesize_cur_kb != def_size) {
1940                 CDEBUG(D_LAYOUT, "Change default DOM stripe size %d->%d\n",
1941                        d->lod_dom_stripesize_cur_kb, def_size);
1942                 d->lod_dom_stripesize_cur_kb = def_size;
1943         }
1944 }
1945
1946 static __u32 lod_dom_stripesize_limit(const struct lu_env *env,
1947                                       struct lod_device *d)
1948 {
1949         int rc;
1950
1951         /* set bfree as fraction of total space */
1952         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_STATFS_SPOOF)) {
1953                 spin_lock(&d->lod_lsfs_lock);
1954                 d->lod_lsfs_free_mb = mult_frac(d->lod_lsfs_total_mb,
1955                                         min_t(int, cfs_fail_val, 100), 100);
1956                 GOTO(recalc, rc = 0);
1957         }
1958
1959         if (d->lod_lsfs_age < ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE) {
1960                 struct obd_statfs sfs;
1961
1962                 spin_lock(&d->lod_lsfs_lock);
1963                 if (d->lod_lsfs_age > ktime_get_seconds() - LOD_DOM_SFS_MAX_AGE)
1964                         GOTO(unlock, rc = 0);
1965
1966                 d->lod_lsfs_age = ktime_get_seconds();
1967                 spin_unlock(&d->lod_lsfs_lock);
1968                 rc = dt_statfs(env, d->lod_child, &sfs);
1969                 if (rc) {
1970                         CDEBUG(D_LAYOUT,
1971                                "%s: failed to get OSD statfs: rc = %d\n",
1972                                lod2obd(d)->obd_name, rc);
1973                         GOTO(out, rc);
1974                 }
1975                 /* udpate local OSD cached statfs data */
1976                 spin_lock(&d->lod_lsfs_lock);
1977                 d->lod_lsfs_total_mb = (sfs.os_blocks * sfs.os_bsize) >> 20;
1978                 d->lod_lsfs_free_mb = (sfs.os_bfree * sfs.os_bsize) >> 20;
1979 recalc:
1980                 lod_dom_stripesize_recalc(d);
1981 unlock:
1982                 spin_unlock(&d->lod_lsfs_lock);
1983         }
1984 out:
1985         return d->lod_dom_stripesize_cur_kb << 10;
1986 }
1987
1988 int lod_dom_stripesize_choose(const struct lu_env *env, struct lod_device *d,
1989                               struct lov_comp_md_v1 *comp_v1,
1990                               struct lov_comp_md_entry_v1 *dom_ent,
1991                               __u32 stripe_size)
1992 {
1993         struct lov_comp_md_entry_v1 *ent;
1994         struct lu_extent *dom_ext, *ext;
1995         struct lov_user_md_v1 *lum;
1996         __u32 max_stripe_size;
1997         __u16 mid, dom_mid;
1998         int rc = 0;
1999         bool dom_next_entry = false;
2000
2001         dom_ext = &dom_ent->lcme_extent;
2002         dom_mid = mirror_id_of(le32_to_cpu(dom_ent->lcme_id));
2003         max_stripe_size = lod_dom_stripesize_limit(env, d);
2004
2005         /* Check stripe size againts current per-MDT limit */
2006         if (stripe_size <= max_stripe_size)
2007                 return 0;
2008
2009         lum = (void *)comp_v1 + le32_to_cpu(dom_ent->lcme_offset);
2010         CDEBUG(D_LAYOUT, "overwrite DoM component size %u with MDT limit %u\n",
2011                stripe_size, max_stripe_size);
2012         lum->lmm_stripe_size = cpu_to_le32(max_stripe_size);
2013
2014         /* In common case the DoM stripe is first entry in a mirror and
2015          * can be deleted only if it is not single entry in layout or
2016          * mirror, otherwise error should be returned.
2017          */
2018         for_each_comp_entry_v1(comp_v1, ent) {
2019                 if (ent == dom_ent)
2020                         continue;
2021
2022                 mid = mirror_id_of(le32_to_cpu(ent->lcme_id));
2023                 if (mid != dom_mid)
2024                         continue;
2025
2026                 ext = &ent->lcme_extent;
2027                 if (ext->e_start != dom_ext->e_end)
2028                         continue;
2029
2030                 /* Found next component after the DoM one with the same
2031                  * mirror_id and adjust its start with DoM component end.
2032                  *
2033                  * NOTE: we are considering here that there can be only one
2034                  * DoM component in a file, all replicas are located on OSTs
2035                  * always and don't need adjustment since use own layouts.
2036                  */
2037                 ext->e_start = cpu_to_le64(max_stripe_size);
2038                 dom_next_entry = true;
2039                 break;
2040         }
2041
2042         if (max_stripe_size == 0) {
2043                 /* DoM component size is zero due to server setting, remove
2044                  * it from the layout but only if next component exists in
2045                  * the same mirror. That must be checked prior calling the
2046                  * lod_erase_dom_stripe().
2047                  */
2048                 if (!dom_next_entry)
2049                         return -EFBIG;
2050
2051                 rc = lod_erase_dom_stripe(comp_v1, dom_ent);
2052         } else {
2053                 /* Update DoM extent end finally */
2054                 dom_ext->e_end = cpu_to_le64(max_stripe_size);
2055         }
2056
2057         return rc;
2058 }
2059
2060 /**
2061  * Verify LOV striping.
2062  *
2063  * \param[in] d                 LOD device
2064  * \param[in] buf               buffer with LOV EA to verify
2065  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
2066  *                              1 - from disk, do not allow
2067  * \param[in] start             extent start for composite layout
2068  *
2069  * \retval                      0 if the striping is valid
2070  * \retval                      -EINVAL if striping is invalid
2071  */
2072 int lod_verify_striping(const struct lu_env *env, struct lod_device *d,
2073                         struct lod_object *lo, const struct lu_buf *buf,
2074                         bool is_from_disk)
2075 {
2076         struct lov_user_md_v1   *lum;
2077         struct lov_comp_md_v1   *comp_v1;
2078         struct lov_comp_md_entry_v1     *ent;
2079         struct lu_extent        *ext;
2080         struct lu_buf   tmp;
2081         __u64   prev_end = 0;
2082         __u32   stripe_size = 0;
2083         __u16   prev_mid = -1, mirror_id = -1;
2084         __u32   mirror_count;
2085         __u32   magic;
2086         int     rc = 0;
2087         ENTRY;
2088
2089         if (buf->lb_len < sizeof(lum->lmm_magic)) {
2090                 CDEBUG(D_LAYOUT, "invalid buf len %zu\n", buf->lb_len);
2091                 RETURN(-EINVAL);
2092         }
2093
2094         lum = buf->lb_buf;
2095
2096         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEFINED;
2097         /* treat foreign LOV EA/object case first
2098          * XXX is it expected to try setting again a foreign?
2099          * XXX should we care about different current vs new layouts ?
2100          */
2101         if (unlikely(magic == LOV_USER_MAGIC_FOREIGN)) {
2102                 struct lov_foreign_md *lfm = buf->lb_buf;
2103
2104                 if (buf->lb_len < offsetof(typeof(*lfm), lfm_value)) {
2105                         CDEBUG(D_LAYOUT,
2106                                "buf len %zu < min lov_foreign_md size (%zu)\n",
2107                                buf->lb_len, offsetof(typeof(*lfm),
2108                                lfm_value));
2109                         RETURN(-EINVAL);
2110                 }
2111
2112                 if (lov_foreign_size_le(lfm) > buf->lb_len) {
2113                         CDEBUG(D_LAYOUT,
2114                                "buf len %zu < this lov_foreign_md size (%zu)\n",
2115                                buf->lb_len, lov_foreign_size_le(lfm));
2116                         RETURN(-EINVAL);
2117                 }
2118                 /* Don't do anything with foreign layouts */
2119                 RETURN(0);
2120         }
2121
2122         /* normal LOV/layout cases */
2123
2124         if (buf->lb_len < sizeof(*lum)) {
2125                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
2126                        buf->lb_len);
2127                 RETURN(-EINVAL);
2128         }
2129
2130         switch (magic) {
2131         case LOV_USER_MAGIC_FOREIGN:
2132                 RETURN(0);
2133         case LOV_USER_MAGIC_V1:
2134         case LOV_USER_MAGIC_V3:
2135         case LOV_USER_MAGIC_SPECIFIC:
2136                 if (lov_pattern(le32_to_cpu(lum->lmm_pattern)) &
2137                     LOV_PATTERN_MDT) {
2138                         /* DoM must use composite layout */
2139                         CDEBUG(D_LAYOUT, "DoM without composite layout\n");
2140                         RETURN(-EINVAL);
2141                 }
2142                 RETURN(lod_verify_v1v3(d, buf, is_from_disk));
2143         case LOV_USER_MAGIC_COMP_V1:
2144         case LOV_USER_MAGIC_SEL:
2145                 break;
2146         default:
2147                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
2148                        le32_to_cpu(lum->lmm_magic));
2149                 RETURN(-EINVAL);
2150         }
2151
2152         /* magic == LOV_USER_MAGIC_COMP_V1 */
2153         comp_v1 = buf->lb_buf;
2154         if (buf->lb_len < le32_to_cpu(comp_v1->lcm_size)) {
2155                 CDEBUG(D_LAYOUT, "buf len %zu is less than %u\n",
2156                        buf->lb_len, le32_to_cpu(comp_v1->lcm_size));
2157                 RETURN(-EINVAL);
2158         }
2159
2160 recheck:
2161         mirror_count = 0;
2162         if (le16_to_cpu(comp_v1->lcm_entry_count) == 0) {
2163                 CDEBUG(D_LAYOUT, "entry count is zero\n");
2164                 RETURN(-EINVAL);
2165         }
2166
2167         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
2168             lo->ldo_comp_cnt > 0) {
2169                 /* could be called from lustre.lov.add */
2170                 __u32 cnt = lo->ldo_comp_cnt;
2171
2172                 ext = &lo->ldo_comp_entries[cnt - 1].llc_extent;
2173                 prev_end = ext->e_end;
2174
2175                 ++mirror_count;
2176         }
2177
2178         for_each_comp_entry_v1(comp_v1, ent) {
2179                 ext = &ent->lcme_extent;
2180
2181                 if (le64_to_cpu(ext->e_start) > le64_to_cpu(ext->e_end) ||
2182                     le64_to_cpu(ext->e_start) & (LOV_MIN_STRIPE_SIZE - 1) ||
2183                     ((__s64)le64_to_cpu(ext->e_start) < 0 &&
2184                     le64_to_cpu(ext->e_start) != LUSTRE_EOF) ||
2185                     (le64_to_cpu(ext->e_end) != LUSTRE_EOF &&
2186                     le64_to_cpu(ext->e_end) & (LOV_MIN_STRIPE_SIZE - 1)) ||
2187                     ((__s64)le64_to_cpu(ext->e_end) < 0 &&
2188                     le64_to_cpu(ext->e_end) != LUSTRE_EOF)) {
2189                         CDEBUG(D_LAYOUT, "invalid extent "DEXT"\n",
2190                                le64_to_cpu(ext->e_start),
2191                                le64_to_cpu(ext->e_end));
2192                         RETURN(-EINVAL);
2193                 }
2194
2195                 if (is_from_disk) {
2196                         /* lcme_id contains valid value */
2197                         if (le32_to_cpu(ent->lcme_id) == 0 ||
2198                             le32_to_cpu(ent->lcme_id) > LCME_ID_MAX) {
2199                                 CDEBUG(D_LAYOUT, "invalid id %u\n",
2200                                        le32_to_cpu(ent->lcme_id));
2201                                 RETURN(-EINVAL);
2202                         }
2203
2204                         if (le16_to_cpu(comp_v1->lcm_mirror_count) > 0) {
2205                                 mirror_id = mirror_id_of(
2206                                                 le32_to_cpu(ent->lcme_id));
2207
2208                                 /* first component must start with 0 */
2209                                 if (mirror_id != prev_mid &&
2210                                     le64_to_cpu(ext->e_start) != 0) {
2211                                         CDEBUG(D_LAYOUT,
2212                                                "invalid start:%llu, expect:0\n",
2213                                                le64_to_cpu(ext->e_start));
2214                                         RETURN(-EINVAL);
2215                                 }
2216
2217                                 prev_mid = mirror_id;
2218                         }
2219                 }
2220
2221                 if (le64_to_cpu(ext->e_start) == 0) {
2222                         ++mirror_count;
2223                         prev_end = 0;
2224                 }
2225
2226                 /* the next must be adjacent with the previous one */
2227                 if (le64_to_cpu(ext->e_start) != prev_end) {
2228                         CDEBUG(D_LAYOUT,
2229                                "invalid start actual:%llu, expect:%llu\n",
2230                                le64_to_cpu(ext->e_start), prev_end);
2231                         RETURN(-EINVAL);
2232                 }
2233
2234                 tmp.lb_buf = (char *)comp_v1 + le32_to_cpu(ent->lcme_offset);
2235                 tmp.lb_len = le32_to_cpu(ent->lcme_size);
2236
2237                 lum = tmp.lb_buf;
2238                 if (le32_to_cpu(lum->lmm_magic) == LOV_MAGIC_FOREIGN) {
2239                         struct lov_foreign_md *lfm;
2240                         struct lov_hsm_md *lhm;
2241                         u32 hsmsize;
2242                         u32 ftype;
2243
2244                         /*
2245                          * Currently when the foreign layout is used as a basic
2246                          * layout component, it only supports HSM foreign types:
2247                          * LU_FOREIGN_TYPE_{POSIX, S3, PCCRW, PCCRO}.
2248                          */
2249                         lfm = (struct lov_foreign_md *)lum;
2250                         ftype = le32_to_cpu(lfm->lfm_type);
2251                         if (!lov_hsm_type_supported(ftype)) {
2252                                 CDEBUG(D_LAYOUT,
2253                                        "Foreign type %#x is not HSM\n", ftype);
2254                                 RETURN(-EINVAL);
2255                         }
2256
2257                         /* Current HSM component must cover [0, EOF]. */
2258                         if (le64_to_cpu(ext->e_start) > 0) {
2259                                 CDEBUG(D_LAYOUT, "Invalid HSM component with %llu extent start\n",
2260                                        le64_to_cpu(ext->e_start));
2261                                 RETURN(-EINVAL);
2262                         }
2263                         if (le64_to_cpu(ext->e_end) != LUSTRE_EOF) {
2264                                 CDEBUG(D_LAYOUT, "Invalid HSM component with %llu extent end\n",
2265                                        le64_to_cpu(ext->e_end));
2266                                 RETURN(-EINVAL);
2267                         }
2268
2269                         lhm = (struct lov_hsm_md *)lfm;
2270                         hsmsize = lov_foreign_size_le(lhm);
2271
2272                         if (le32_to_cpu(lhm->lhm_length) !=
2273                             sizeof(struct lov_hsm_base)) {
2274                                 CDEBUG(D_LAYOUT,
2275                                        "Invalid HSM component size %u != %u\n",
2276                                        le32_to_cpu(ent->lcme_size), hsmsize);
2277                                 RETURN(-EINVAL);
2278                         }
2279
2280                         if (le32_to_cpu(ent->lcme_size) < hsmsize) {
2281                                 CDEBUG(D_LAYOUT,
2282                                        "Invalid HSM component size %u != %u\n",
2283                                        le32_to_cpu(ent->lcme_size), hsmsize);
2284                                 RETURN(-EINVAL);
2285                         }
2286                         if (le32_to_cpu(lhm->lhm_flags) & ~HSM_FLAGS_MASK ||
2287                             !(le32_to_cpu(lhm->lhm_flags) & HSM_FLAGS_MASK)) {
2288                                 CDEBUG(D_LAYOUT,
2289                                        "Invalid HSM component flags %#x\n",
2290                                        le32_to_cpu(lhm->lhm_flags));
2291                                 RETURN(-EINVAL);
2292                         }
2293                         continue;
2294                 }
2295
2296                 /* Check DoM entry is always the first one */
2297                 if (lov_pattern(le32_to_cpu(lum->lmm_pattern)) &
2298                     LOV_PATTERN_MDT) {
2299                         /* DoM component must be the first in a mirror */
2300                         if (le64_to_cpu(ext->e_start) > 0) {
2301                                 CDEBUG(D_LAYOUT, "invalid DoM component "
2302                                        "with %llu extent start\n",
2303                                        le64_to_cpu(ext->e_start));
2304                                 RETURN(-EINVAL);
2305                         }
2306                         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2307                         /* There is just one stripe on MDT and it must
2308                          * cover whole component size. */
2309                         if (stripe_size != le64_to_cpu(ext->e_end)) {
2310                                 CDEBUG(D_LAYOUT, "invalid DoM layout "
2311                                        "stripe size %u != %llu "
2312                                        "(component size)\n",
2313                                        stripe_size, prev_end);
2314                                 RETURN(-EINVAL);
2315                         }
2316                         /* Check and adjust stripe size by per-MDT limit */
2317                         rc = lod_dom_stripesize_choose(env, d, comp_v1, ent,
2318                                                        stripe_size);
2319                         /* DoM entry was removed, re-check layout from start */
2320                         if (rc == -ERESTART)
2321                                 goto recheck;
2322                         else if (rc)
2323                                 RETURN(rc);
2324
2325                         if (le16_to_cpu(lum->lmm_stripe_count) == 1)
2326                                 lum->lmm_stripe_count = 0;
2327                         /* Any stripe count is forbidden on DoM component */
2328                         if (lum->lmm_stripe_count > 0) {
2329                                 CDEBUG(D_LAYOUT,
2330                                        "invalid DoM layout stripe count %u, must be 0\n",
2331                                        le16_to_cpu(lum->lmm_stripe_count));
2332                                 RETURN(-EINVAL);
2333                         }
2334
2335                         /* Any pool is forbidden on DoM component */
2336                         if (lum->lmm_magic == LOV_USER_MAGIC_V3) {
2337                                 struct lov_user_md_v3 *v3 = (void *)lum;
2338
2339                                 if (v3->lmm_pool_name[0] != '\0') {
2340                                         CDEBUG(D_LAYOUT,
2341                                                "DoM component cannot have pool assigned\n");
2342                                         RETURN(-EINVAL);
2343                                 }
2344                         }
2345                 }
2346
2347                 prev_end = le64_to_cpu(ext->e_end);
2348
2349                 rc = lod_verify_v1v3(d, &tmp, is_from_disk);
2350                 if (rc)
2351                         RETURN(rc);
2352
2353                 if (prev_end == LUSTRE_EOF || ext->e_start == prev_end)
2354                         continue;
2355
2356                 /* extent end must be aligned with the stripe_size */
2357                 stripe_size = le32_to_cpu(lum->lmm_stripe_size);
2358                 if (stripe_size && prev_end % stripe_size) {
2359                         CDEBUG(D_LAYOUT, "stripe size isn't aligned, "
2360                                "stripe_sz: %u, [%llu, %llu)\n",
2361                                stripe_size, ext->e_start, prev_end);
2362                         RETURN(-EINVAL);
2363                 }
2364         }
2365
2366         /* make sure that the mirror_count is telling the truth */
2367         if (mirror_count != le16_to_cpu(comp_v1->lcm_mirror_count) + 1)
2368                 RETURN(-EINVAL);
2369
2370         RETURN(0);
2371 }
2372
2373 /**
2374  * set the default stripe size, if unset.
2375  *
2376  * \param[in,out] val   number of bytes per OST stripe
2377  *
2378  * The minimum stripe size is 64KB to ensure that a single stripe is an
2379  * even multiple of a client PAGE_SIZE (IA64, PPC, etc).  Otherwise, it
2380  * is difficult to split dirty pages across OSCs during writes.
2381  */
2382 void lod_fix_desc_stripe_size(__u64 *val)
2383 {
2384         if (*val < LOV_MIN_STRIPE_SIZE) {
2385                 if (*val != 0)
2386                         LCONSOLE_INFO("Increasing default stripe size to "
2387                                       "minimum value %u\n",
2388                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
2389                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
2390         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
2391                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
2392                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
2393                               "multiple of %u)\n",
2394                               *val, LOV_MIN_STRIPE_SIZE);
2395         }
2396 }
2397
2398 /**
2399  * set the filesystem default number of stripes, if unset.
2400  *
2401  * \param[in,out] val   number of stripes
2402  *
2403  * A value of "0" means "use the system-wide default stripe count", which
2404  * has either been inherited by now, or falls back to 1 stripe per file.
2405  * A value of "-1" (0xffffffff) means "stripe over all available OSTs",
2406  * and is a valid value, so is left unchanged here.
2407  */
2408 void lod_fix_desc_stripe_count(__u32 *val)
2409 {
2410         if (*val == 0)
2411                 *val = 1;
2412 }
2413
2414 /**
2415  * set the filesystem default layout pattern
2416  *
2417  * \param[in,out] val   LOV_PATTERN_* layout
2418  *
2419  * A value of "0" means "use the system-wide default layout type", which
2420  * has either been inherited by now, or falls back to plain RAID0 striping.
2421  */
2422 void lod_fix_desc_pattern(__u32 *val)
2423 {
2424         /* from lov_setstripe */
2425         if ((*val != 0) && !lov_pattern_supported_normal_comp(*val)) {
2426                 LCONSOLE_WARN("lod: Unknown stripe pattern: %#x\n", *val);
2427                 *val = 0;
2428         }
2429 }
2430
2431 void lod_fix_lmv_desc_pattern(__u32 *val)
2432 {
2433         if ((*val) && !lmv_is_known_hash_type(*val)) {
2434                 LCONSOLE_WARN("lod: Unknown md stripe pattern: %#x\n", *val);
2435                 *val = 0;
2436         }
2437 }
2438
2439 void lod_fix_desc_qos_maxage(__u32 *val)
2440 {
2441         /* fix qos_maxage */
2442         if (*val == 0)
2443                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
2444 }
2445
2446 /**
2447  * Used to fix insane default striping.
2448  *
2449  * \param[in] desc      striping description
2450  */
2451 void lod_fix_desc(struct lov_desc *desc)
2452 {
2453         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
2454         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2455         lod_fix_desc_pattern(&desc->ld_pattern);
2456         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2457 }
2458
2459 static void lod_fix_lmv_desc(struct lmv_desc *desc)
2460 {
2461         desc->ld_active_tgt_count = 0;
2462         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
2463         lod_fix_lmv_desc_pattern(&desc->ld_pattern);
2464         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
2465 }
2466
2467 /**
2468  * Initialize the structures used to store pools and default striping.
2469  *
2470  * \param[in] lod       LOD device
2471  * \param[in] lcfg      configuration structure storing default striping.
2472  *
2473  * \retval              0 if initialization succeeds
2474  * \retval              negative error number on failure
2475  */
2476 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
2477 {
2478         struct obd_device          *obd;
2479         struct lov_desc            *desc;
2480         int                         rc;
2481         ENTRY;
2482
2483         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
2484         LASSERT(obd != NULL);
2485         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
2486
2487         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
2488                 CERROR("LOD setup requires a descriptor\n");
2489                 RETURN(-EINVAL);
2490         }
2491
2492         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
2493
2494         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
2495                 CERROR("descriptor size wrong: %d > %d\n",
2496                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
2497                 RETURN(-EINVAL);
2498         }
2499
2500         if (desc->ld_magic != LOV_DESC_MAGIC) {
2501                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
2502                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
2503                                obd->obd_name, desc);
2504                         lustre_swab_lov_desc(desc);
2505                 } else {
2506                         CERROR("%s: Bad lov desc magic: %#x\n",
2507                                obd->obd_name, desc->ld_magic);
2508                         RETURN(-EINVAL);
2509                 }
2510         }
2511
2512         lod_fix_desc(desc);
2513
2514         desc->ld_active_tgt_count = 0;
2515         lod->lod_ost_descs.ltd_lov_desc = *desc;
2516
2517         /* NB: config doesn't contain lmv_desc, alter it via sysfs. */
2518         lod_fix_lmv_desc(&lod->lod_mdt_descs.ltd_lmv_desc);
2519
2520         lod->lod_sp_me = LUSTRE_SP_CLI;
2521
2522         /* Set up OST pool environment */
2523         lod->lod_pool_count = 0;
2524         rc = lod_pool_hash_init(&lod->lod_pools_hash_body);
2525         if (rc)
2526                 RETURN(-ENOMEM);
2527
2528         INIT_LIST_HEAD(&lod->lod_pool_list);
2529         lod->lod_pool_count = 0;
2530         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_tgt_pool, 0);
2531         if (rc)
2532                 GOTO(out_hash, rc);
2533
2534         rc = lu_tgt_pool_init(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool, 0);
2535         if (rc)
2536                 GOTO(out_mdt_pool, rc);
2537
2538         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_tgt_pool, 0);
2539         if (rc)
2540                 GOTO(out_mdt_rr_pool, rc);
2541
2542         rc = lu_tgt_pool_init(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool, 0);
2543         if (rc)
2544                 GOTO(out_ost_pool, rc);
2545
2546         RETURN(0);
2547
2548 out_ost_pool:
2549         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2550 out_mdt_rr_pool:
2551         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2552 out_mdt_pool:
2553         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2554 out_hash:
2555         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2556
2557         return rc;
2558 }
2559
2560 /**
2561  * Release the structures describing the pools.
2562  *
2563  * \param[in] lod       LOD device from which we release the structures
2564  *
2565  * \retval              0 always
2566  */
2567 int lod_pools_fini(struct lod_device *lod)
2568 {
2569         struct obd_device   *obd = lod2obd(lod);
2570         struct lod_pool_desc *pool, *tmp;
2571         ENTRY;
2572
2573         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
2574                 /* free pool structs */
2575                 CDEBUG(D_INFO, "delete pool %p\n", pool);
2576                 /* In the function below, .hs_keycmp resolves to
2577                  * pool_hashkey_keycmp() */
2578                 lod_pool_del(obd, pool->pool_name);
2579         }
2580
2581         lod_pool_hash_destroy(&lod->lod_pools_hash_body);
2582         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_qos.lq_rr.lqr_pool);
2583         lu_tgt_pool_free(&lod->lod_ost_descs.ltd_tgt_pool);
2584         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_qos.lq_rr.lqr_pool);
2585         lu_tgt_pool_free(&lod->lod_mdt_descs.ltd_tgt_pool);
2586
2587         RETURN(0);
2588 }