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, 2014, 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
  43 #include "lod_internal.h"
  44
  45 /**
  46  * Increase reference count on the target table.
  47  *
  48  * Increase reference count on the target table usage to prevent racing with
  49  * addition/deletion. Any function that expects the table to remain
  50  * stationary must take a ref.
  51  *
  52  * \param[in] ltd       target table (lod_ost_descs or lod_mdt_descs)
  53  */
  54 void lod_getref(struct lod_tgt_descs *ltd)
  55 {
  56         down_read(&ltd->ltd_rw_sem);
  57         mutex_lock(&ltd->ltd_mutex);
  58         ltd->ltd_refcount++;
  59         mutex_unlock(&ltd->ltd_mutex);
  60 }
  61
  62 /**
  63  * Decrease reference count on the target table.
  64  *
  65  * Companion of lod_getref() to release a reference on the target table.
  66  * If this is the last reference and the OST entry was scheduled for deletion,
  67  * the descriptor is removed from the table.
  68  *
  69  * \param[in] lod       LOD device from which we release a reference
  70  * \param[in] ltd       target table (lod_ost_descs or lod_mdt_descs)
  71  */
  72 void lod_putref(struct lod_device *lod, struct lod_tgt_descs *ltd)
  73 {
  74         mutex_lock(&ltd->ltd_mutex);
  75         ltd->ltd_refcount--;
  76         if (ltd->ltd_refcount == 0 && ltd->ltd_death_row) {
  77                 struct lod_tgt_desc *tgt_desc, *tmp;
  78                 struct list_head kill;
  79                 unsigned int idx;
  80
  81                 CDEBUG(D_CONFIG, "destroying %d ltd desc\n",
  82                        ltd->ltd_death_row);
  83
  84                 INIT_LIST_HEAD(&kill);
  85
  86                 cfs_foreach_bit(ltd->ltd_tgt_bitmap, idx) {
  87                         tgt_desc = LTD_TGT(ltd, idx);
  88                         LASSERT(tgt_desc);
  89
  90                         if (!tgt_desc->ltd_reap)
  91                                 continue;
  92
  93                         list_add(&tgt_desc->ltd_kill, &kill);
  94                         LTD_TGT(ltd, idx) = NULL;
  95                         /*FIXME: only support ost pool for now */
  96                         if (ltd == &lod->lod_ost_descs) {
  97                                 lod_ost_pool_remove(&lod->lod_pool_info, idx);
  98                                 if (tgt_desc->ltd_active)
  99                                         lod->lod_desc.ld_active_tgt_count--;
 100                         }
 101                         ltd->ltd_tgtnr--;
 102                         cfs_bitmap_clear(ltd->ltd_tgt_bitmap, idx);
 103                         ltd->ltd_death_row--;
 104                 }
 105                 mutex_unlock(&ltd->ltd_mutex);
 106                 up_read(&ltd->ltd_rw_sem);
 107
 108                 list_for_each_entry_safe(tgt_desc, tmp, &kill, ltd_kill) {
 109                         int rc;
 110                         list_del(&tgt_desc->ltd_kill);
 111                         if (ltd == &lod->lod_ost_descs) {
 112                                 /* remove from QoS structures */
 113                                 rc = qos_del_tgt(lod, tgt_desc);
 114                                 if (rc)
 115                                         CERROR("%s: qos_del_tgt(%s) failed:"
 116                                                "rc = %d\n",
 117                                                lod2obd(lod)->obd_name,
 118                                               obd_uuid2str(&tgt_desc->ltd_uuid),
 119                                                rc);
 120                         }
 121                         rc = obd_disconnect(tgt_desc->ltd_exp);
 122                         if (rc)
 123                                 CERROR("%s: failed to disconnect %s: rc = %d\n",
 124                                        lod2obd(lod)->obd_name,
 125                                        obd_uuid2str(&tgt_desc->ltd_uuid), rc);
 126                         OBD_FREE_PTR(tgt_desc);
 127                 }
 128         } else {
 129                 mutex_unlock(&ltd->ltd_mutex);
 130                 up_read(&ltd->ltd_rw_sem);
 131         }
 132 }
 133
 134 /**
 135  * Expand size of target table.
 136  *
 137  * When the target table is full, we have to extend the table. To do so,
 138  * we allocate new memory with some reserve, move data from the old table
 139  * to the new one and release memory consumed by the old table.
 140  * Notice we take ltd_rw_sem exclusively to ensure atomic switch.
 141  *
 142  * \param[in] ltd               target table
 143  * \param[in] newsize           new size of the table
 144  *
 145  * \retval                      0 on success
 146  * \retval                      -ENOMEM if reallocation failed
 147  */
 148 static int ltd_bitmap_resize(struct lod_tgt_descs *ltd, __u32 newsize)
 149 {
 150         cfs_bitmap_t *new_bitmap, *old_bitmap = NULL;
 151         int           rc = 0;
 152         ENTRY;
 153
 154         /* grab write reference on the lod. Relocating the array requires
 155          * exclusive access */
 156
 157         down_write(&ltd->ltd_rw_sem);
 158         if (newsize <= ltd->ltd_tgts_size)
 159                 /* someone else has already resize the array */
 160                 GOTO(out, rc = 0);
 161
 162         /* allocate new bitmap */
 163         new_bitmap = CFS_ALLOCATE_BITMAP(newsize);
 164         if (!new_bitmap)
 165                 GOTO(out, rc = -ENOMEM);
 166
 167         if (ltd->ltd_tgts_size > 0) {
 168                 /* the bitmap already exists, we need
 169                  * to copy data from old one */
 170                 cfs_bitmap_copy(new_bitmap, ltd->ltd_tgt_bitmap);
 171                 old_bitmap = ltd->ltd_tgt_bitmap;
 172         }
 173
 174         ltd->ltd_tgts_size  = newsize;
 175         ltd->ltd_tgt_bitmap = new_bitmap;
 176
 177         if (old_bitmap)
 178                 CFS_FREE_BITMAP(old_bitmap);
 179
 180         CDEBUG(D_CONFIG, "tgt size: %d\n", ltd->ltd_tgts_size);
 181
 182         EXIT;
 183 out:
 184         up_write(&ltd->ltd_rw_sem);
 185         return rc;
 186 }
 187
 188 /**
 189  * Connect LOD to a new OSP and add it to the target table.
 190  *
 191  * Connect to the OSP device passed, initialize all the internal
 192  * structures related to the device and add it to the target table.
 193  *
 194  * \param[in] env               execution environment for this thread
 195  * \param[in] lod               LOD device to be connected to the new OSP
 196  * \param[in] osp               name of OSP device name to be added
 197  * \param[in] index             index of the new target
 198  * \param[in] gen               target's generation number
 199  * \param[in] tgt_index         OSP's group
 200  * \param[in] type              type of device (mdc or osc)
 201  * \param[in] active            state of OSP: 0 - inactive, 1 - active
 202  *
 203  * \retval                      0 if added successfully
 204  * \retval                      negative error number on failure
 205  */
 206 int lod_add_device(const struct lu_env *env, struct lod_device *lod,
 207                    char *osp, unsigned index, unsigned gen, int tgt_index,
 208                    char *type, int active)
 209 {
 210         struct obd_connect_data *data = NULL;
 211         struct obd_export       *exp = NULL;
 212         struct obd_device       *obd;
 213         struct lu_device        *ldev;
 214         struct dt_device        *d;
 215         int                      rc;
 216         struct lod_tgt_desc     *tgt_desc;
 217         struct lod_tgt_descs    *ltd;
 218         struct obd_uuid         obd_uuid;
 219         bool                    for_ost;
 220         ENTRY;
 221
 222         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, index, gen);
 223
 224         if (gen <= 0) {
 225                 CERROR("request to add OBD %s with invalid generation: %d\n",
 226                        osp, gen);
 227                 RETURN(-EINVAL);
 228         }
 229
 230         obd_str2uuid(&obd_uuid, osp);
 231
 232         obd = class_find_client_obd(&obd_uuid, LUSTRE_OSP_NAME,
 233                                 &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 234         if (obd == NULL) {
 235                 CERROR("can't find %s device\n", osp);
 236                 RETURN(-EINVAL);
 237         }
 238
 239         OBD_ALLOC_PTR(data);
 240         if (data == NULL)
 241                 RETURN(-ENOMEM);
 242
 243         data->ocd_connect_flags = OBD_CONNECT_INDEX | OBD_CONNECT_VERSION;
 244         data->ocd_version = LUSTRE_VERSION_CODE;
 245         data->ocd_index = index;
 246
 247         if (strcmp(LUSTRE_OSC_NAME, type) == 0) {
 248                 for_ost = true;
 249                 data->ocd_connect_flags |= OBD_CONNECT_AT |
 250                                            OBD_CONNECT_FULL20 |
 251                                            OBD_CONNECT_INDEX |
 252 #ifdef HAVE_LRU_RESIZE_SUPPORT
 253                                            OBD_CONNECT_LRU_RESIZE |
 254 #endif
 255                                            OBD_CONNECT_MDS |
 256                                            OBD_CONNECT_OSS_CAPA |
 257                                            OBD_CONNECT_REQPORTAL |
 258                                            OBD_CONNECT_SKIP_ORPHAN |
 259                                            OBD_CONNECT_FID |
 260                                            OBD_CONNECT_LVB_TYPE |
 261                                            OBD_CONNECT_VERSION |
 262                                            OBD_CONNECT_PINGLESS |
 263                                            OBD_CONNECT_LFSCK;
 264
 265                 data->ocd_group = tgt_index;
 266                 ltd = &lod->lod_ost_descs;
 267         } else {
 268                 struct obd_import *imp = obd->u.cli.cl_import;
 269
 270                 for_ost = false;
 271                 data->ocd_ibits_known = MDS_INODELOCK_UPDATE;
 272                 data->ocd_connect_flags |= OBD_CONNECT_ACL |
 273                                            OBD_CONNECT_MDS_CAPA |
 274                                            OBD_CONNECT_OSS_CAPA |
 275                                            OBD_CONNECT_IBITS |
 276                                            OBD_CONNECT_MDS_MDS |
 277                                            OBD_CONNECT_FID |
 278                                            OBD_CONNECT_AT |
 279                                            OBD_CONNECT_FULL20 |
 280                                            OBD_CONNECT_LFSCK;
 281                 spin_lock(&imp->imp_lock);
 282                 imp->imp_server_timeout = 1;
 283                 spin_unlock(&imp->imp_lock);
 284                 imp->imp_client->cli_request_portal = OUT_PORTAL;
 285                 CDEBUG(D_OTHER, "%s: Set 'mds' portal and timeout\n",
 286                       obd->obd_name);
 287                 ltd = &lod->lod_mdt_descs;
 288         }
 289
 290         rc = obd_connect(env, &exp, obd, &obd->obd_uuid, data, NULL);
 291         OBD_FREE_PTR(data);
 292         if (rc) {
 293                 CERROR("%s: cannot connect to next dev %s (%d)\n",
 294                        obd->obd_name, osp, rc);
 295                 GOTO(out_free, rc);
 296         }
 297
 298         LASSERT(obd->obd_lu_dev);
 299         LASSERT(obd->obd_lu_dev->ld_site == lod->lod_dt_dev.dd_lu_dev.ld_site);
 300
 301         ldev = obd->obd_lu_dev;
 302         d = lu2dt_dev(ldev);
 303
 304         /* Allocate ost descriptor and fill it */
 305         OBD_ALLOC_PTR(tgt_desc);
 306         if (!tgt_desc)
 307                 GOTO(out_conn, rc = -ENOMEM);
 308
 309         tgt_desc->ltd_tgt    = d;
 310         tgt_desc->ltd_exp    = exp;
 311         tgt_desc->ltd_uuid   = obd->u.cli.cl_target_uuid;
 312         tgt_desc->ltd_gen    = gen;
 313         tgt_desc->ltd_index  = index;
 314         tgt_desc->ltd_active = active;
 315
 316         lod_getref(ltd);
 317         if (index >= ltd->ltd_tgts_size) {
 318                 /* we have to increase the size of the lod_osts array */
 319                 __u32  newsize;
 320
 321                 newsize = max(ltd->ltd_tgts_size, (__u32)2);
 322                 while (newsize < index + 1)
 323                         newsize = newsize << 1;
 324
 325                 /* lod_bitmap_resize() needs lod_rw_sem
 326                  * which we hold with th reference */
 327                 lod_putref(lod, ltd);
 328
 329                 rc = ltd_bitmap_resize(ltd, newsize);
 330                 if (rc)
 331                         GOTO(out_desc, rc);
 332
 333                 lod_getref(ltd);
 334         }
 335
 336         mutex_lock(&ltd->ltd_mutex);
 337         if (cfs_bitmap_check(ltd->ltd_tgt_bitmap, index)) {
 338                 CERROR("%s: device %d is registered already\n", obd->obd_name,
 339                        index);
 340                 GOTO(out_mutex, rc = -EEXIST);
 341         }
 342
 343         if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 344                 OBD_ALLOC_PTR(ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK]);
 345                 if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 346                         CERROR("can't allocate index to add %s\n",
 347                                obd->obd_name);
 348                         GOTO(out_mutex, rc = -ENOMEM);
 349                 }
 350         }
 351
 352         if (!strcmp(LUSTRE_OSC_NAME, type)) {
 353                 /* pool and qos are not supported for MDS stack yet */
 354                 rc = lod_ost_pool_add(&lod->lod_pool_info, index,
 355                                       lod->lod_osts_size);
 356                 if (rc) {
 357                         CERROR("%s: can't set up pool, failed with %d\n",
 358                                obd->obd_name, rc);
 359                         GOTO(out_mutex, rc);
 360                 }
 361
 362                 rc = qos_add_tgt(lod, tgt_desc);
 363                 if (rc) {
 364                         CERROR("%s: qos_add_tgt failed with %d\n",
 365                                 obd->obd_name, rc);
 366                         GOTO(out_pool, rc);
 367                 }
 368
 369                 /* The new OST is now a full citizen */
 370                 if (index >= lod->lod_desc.ld_tgt_count)
 371                         lod->lod_desc.ld_tgt_count = index + 1;
 372                 if (active)
 373                         lod->lod_desc.ld_active_tgt_count++;
 374         }
 375
 376         LTD_TGT(ltd, index) = tgt_desc;
 377         cfs_bitmap_set(ltd->ltd_tgt_bitmap, index);
 378         ltd->ltd_tgtnr++;
 379         mutex_unlock(&ltd->ltd_mutex);
 380         lod_putref(lod, ltd);
 381         if (lod->lod_recovery_completed)
 382                 ldev->ld_ops->ldo_recovery_complete(env, ldev);
 383
 384         rc = lfsck_add_target(env, lod->lod_child, d, exp, index, for_ost);
 385         if (rc != 0)
 386                 CERROR("Fail to add LFSCK target: name = %s, type = %s, "
 387                        "index = %u, rc = %d\n", osp, type, index, rc);
 388
 389         RETURN(rc);
 390
 391 out_pool:
 392         lod_ost_pool_remove(&lod->lod_pool_info, index);
 393 out_mutex:
 394         mutex_unlock(&ltd->ltd_mutex);
 395         lod_putref(lod, ltd);
 396 out_desc:
 397         OBD_FREE_PTR(tgt_desc);
 398 out_conn:
 399         obd_disconnect(exp);
 400 out_free:
 401         return rc;
 402 }
 403
 404 /**
 405  * Schedule target removal from the target table.
 406  *
 407  * Mark the device as dead. The device is not removed here because it may
 408  * still be in use. The device will be removed in lod_putref() when the
 409  * last reference is released.
 410  *
 411  * \param[in] env               execution environment for this thread
 412  * \param[in] lod               LOD device the target table belongs to
 413  * \param[in] ltd               target table
 414  * \param[in] idx               index of the target
 415  * \param[in] for_ost           type of the target: 0 - MDT, 1 - OST
 416  */
 417 static void __lod_del_device(const struct lu_env *env, struct lod_device *lod,
 418                              struct lod_tgt_descs *ltd, unsigned idx,
 419                              bool for_ost)
 420 {
 421         LASSERT(LTD_TGT(ltd, idx));
 422
 423         lfsck_del_target(env, lod->lod_child, LTD_TGT(ltd, idx)->ltd_tgt,
 424                          idx, for_ost);
 425
 426         if (LTD_TGT(ltd, idx)->ltd_reap == 0) {
 427                 LTD_TGT(ltd, idx)->ltd_reap = 1;
 428                 ltd->ltd_death_row++;
 429         }
 430 }
 431
 432 /**
 433  * Schedule removal of all the targets from the given target table.
 434  *
 435  * See more details in the description for __lod_del_device()
 436  *
 437  * \param[in] env               execution environment for this thread
 438  * \param[in] lod               LOD device the target table belongs to
 439  * \param[in] ltd               target table
 440  * \param[in] for_ost           type of the target: MDT or OST
 441  *
 442  * \retval                      0 always
 443  */
 444 int lod_fini_tgt(const struct lu_env *env, struct lod_device *lod,
 445                  struct lod_tgt_descs *ltd, bool for_ost)
 446 {
 447         unsigned int idx;
 448
 449         if (ltd->ltd_tgts_size <= 0)
 450                 return 0;
 451         lod_getref(ltd);
 452         mutex_lock(&ltd->ltd_mutex);
 453         cfs_foreach_bit(ltd->ltd_tgt_bitmap, idx)
 454                 __lod_del_device(env, lod, ltd, idx, for_ost);
 455         mutex_unlock(&ltd->ltd_mutex);
 456         lod_putref(lod, ltd);
 457         CFS_FREE_BITMAP(ltd->ltd_tgt_bitmap);
 458         for (idx = 0; idx < TGT_PTRS; idx++) {
 459                 if (ltd->ltd_tgt_idx[idx])
 460                         OBD_FREE_PTR(ltd->ltd_tgt_idx[idx]);
 461         }
 462         ltd->ltd_tgts_size = 0;
 463         return 0;
 464 }
 465
 466 /**
 467  * Remove device by name.
 468  *
 469  * Remove a device identified by \a osp from the target table. Given
 470  * the device can be in use, the real deletion happens in lod_putref().
 471  *
 472  * \param[in] env               execution environment for this thread
 473  * \param[in] lod               LOD device to be connected to the new OSP
 474  * \param[in] ltd               target table
 475  * \param[in] osp               name of OSP device to be removed
 476  * \param[in] idx               index of the target
 477  * \param[in] gen               generation number, not used currently
 478  * \param[in] for_ost           type of the target: 0 - MDT, 1 - OST
 479  *
 480  * \retval                      0 if the device was scheduled for removal
 481  * \retval                      -EINVAL if no device was found
 482  */
 483 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
 484                    struct lod_tgt_descs *ltd, char *osp, unsigned idx,
 485                    unsigned gen, bool for_ost)
 486 {
 487         struct obd_device *obd;
 488         int                rc = 0;
 489         struct obd_uuid    uuid;
 490         ENTRY;
 491
 492         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
 493
 494         obd_str2uuid(&uuid, osp);
 495
 496         obd = class_find_client_obd(&uuid, LUSTRE_OSP_NAME,
 497                                    &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 498         if (obd == NULL) {
 499                 CERROR("can't find %s device\n", osp);
 500                 RETURN(-EINVAL);
 501         }
 502
 503         if (gen <= 0) {
 504                 CERROR("%s: request to remove OBD %s with invalid generation %d"
 505                        "\n", obd->obd_name, osp, gen);
 506                 RETURN(-EINVAL);
 507         }
 508
 509         obd_str2uuid(&uuid,  osp);
 510
 511         lod_getref(ltd);
 512         mutex_lock(&ltd->ltd_mutex);
 513         /* check that the index is allocated in the bitmap */
 514         if (!cfs_bitmap_check(ltd->ltd_tgt_bitmap, idx) ||
 515             !LTD_TGT(ltd, idx)) {
 516                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
 517                 GOTO(out, rc = -EINVAL);
 518         }
 519
 520         /* check that the UUID matches */
 521         if (!obd_uuid_equals(&uuid, &LTD_TGT(ltd, idx)->ltd_uuid)) {
 522                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
 523                        obd->obd_name, obd_uuid2str(&LTD_TGT(ltd,idx)->ltd_uuid),
 524                        idx, osp);
 525                 GOTO(out, rc = -EINVAL);
 526         }
 527
 528         __lod_del_device(env, lod, ltd, idx, for_ost);
 529         EXIT;
 530 out:
 531         mutex_unlock(&ltd->ltd_mutex);
 532         lod_putref(lod, ltd);
 533         return(rc);
 534 }
 535
 536 /**
 537  * Resize per-thread storage to hold specified size.
 538  *
 539  * A helper function to resize per-thread temporary storage. This storage
 540  * is used to process LOV/LVM EAs and may be quite large. We do not want to
 541  * allocate/release it every time, so instead we put it into the env and
 542  * reallocate on demand. The memory is released when the correspondent thread
 543  * is finished.
 544  *
 545  * \param[in] info              LOD-specific storage in the environment
 546  * \param[in] size              new size to grow the buffer to
 547
 548  * \retval                      0 on success, -ENOMEM if reallocation failed
 549  */
 550 int lod_ea_store_resize(struct lod_thread_info *info, size_t size)
 551 {
 552         __u32 round = size_roundup_power2(size);
 553
 554         LASSERT(round <=
 555                 lov_mds_md_size(LOV_MAX_STRIPE_COUNT, LOV_MAGIC_V3));
 556         if (info->lti_ea_store) {
 557                 LASSERT(info->lti_ea_store_size);
 558                 LASSERT(info->lti_ea_store_size < round);
 559                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
 560                        info->lti_ea_store_size, round);
 561                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
 562                 info->lti_ea_store = NULL;
 563                 info->lti_ea_store_size = 0;
 564         }
 565
 566         OBD_ALLOC_LARGE(info->lti_ea_store, round);
 567         if (info->lti_ea_store == NULL)
 568                 RETURN(-ENOMEM);
 569         info->lti_ea_store_size = round;
 570         RETURN(0);
 571 }
 572
 573 /**
 574  * Make LOV EA for striped object.
 575  *
 576  * Generate striping information and store it in the LOV EA of the given
 577  * object. The caller must ensure nobody else is calling the function
 578  * against the object concurrently. The transaction must be started.
 579  * FLDB service must be running as well; it's used to map FID to the target,
 580  * which is stored in LOV EA.
 581  *
 582  * \param[in] env               execution environment for this thread
 583  * \param[in] lo                LOD object
 584  * \param[in] th                transaction handle
 585  *
 586  * \retval                      0 if LOV EA is stored successfully
 587  * \retval                      negative error number on failure
 588  */
 589 int lod_generate_and_set_lovea(const struct lu_env *env,
 590                                struct lod_object *lo, struct thandle *th)
 591 {
 592         struct lod_thread_info  *info = lod_env_info(env);
 593         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 594         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
 595         struct lov_mds_md_v1    *lmm;
 596         struct lov_ost_data_v1  *objs;
 597         __u32                    magic;
 598         int                      i, rc;
 599         size_t                   lmm_size;
 600         ENTRY;
 601
 602         LASSERT(lo);
 603
 604         magic = lo->ldo_pool != NULL ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
 605         lmm_size = lov_mds_md_size(lo->ldo_stripenr, magic);
 606         if (info->lti_ea_store_size < lmm_size) {
 607                 rc = lod_ea_store_resize(info, lmm_size);
 608                 if (rc)
 609                         RETURN(rc);
 610         }
 611
 612         if (lo->ldo_pattern == 0) /* default striping */
 613                 lo->ldo_pattern = LOV_PATTERN_RAID0;
 614
 615         lmm = info->lti_ea_store;
 616
 617         lmm->lmm_magic = cpu_to_le32(magic);
 618         lmm->lmm_pattern = cpu_to_le32(lo->ldo_pattern);
 619         fid_to_lmm_oi(fid, &lmm->lmm_oi);
 620         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
 621                 lmm->lmm_oi.oi.oi_id++;
 622         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
 623         lmm->lmm_stripe_size = cpu_to_le32(lo->ldo_stripe_size);
 624         lmm->lmm_stripe_count = cpu_to_le16(lo->ldo_stripenr);
 625         if (lo->ldo_pattern & LOV_PATTERN_F_RELEASED)
 626                 lmm->lmm_stripe_count = cpu_to_le16(lo->ldo_released_stripenr);
 627         lmm->lmm_layout_gen = 0;
 628         if (magic == LOV_MAGIC_V1) {
 629                 objs = &lmm->lmm_objects[0];
 630         } else {
 631                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *) lmm;
 632                 size_t cplen = strlcpy(v3->lmm_pool_name, lo->ldo_pool,
 633                                 sizeof(v3->lmm_pool_name));
 634                 if (cplen >= sizeof(v3->lmm_pool_name))
 635                         RETURN(-E2BIG);
 636                 objs = &v3->lmm_objects[0];
 637         }
 638
 639         for (i = 0; i < lo->ldo_stripenr; i++) {
 640                 struct lu_fid           *fid    = &info->lti_fid;
 641                 struct lod_device       *lod;
 642                 __u32                   index;
 643                 int                     type    = LU_SEQ_RANGE_OST;
 644
 645                 lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 646                 LASSERT(lo->ldo_stripe[i]);
 647
 648                 *fid = *lu_object_fid(&lo->ldo_stripe[i]->do_lu);
 649                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF)) {
 650                         if (cfs_fail_val == 0)
 651                                 cfs_fail_val = fid->f_oid;
 652                         else
 653                                 fid->f_oid = cfs_fail_val;
 654                 }
 655
 656                 rc = fid_to_ostid(fid, &info->lti_ostid);
 657                 LASSERT(rc == 0);
 658
 659                 ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 660                 objs[i].l_ost_gen    = cpu_to_le32(0);
 661                 rc = lod_fld_lookup(env, lod, fid, &index, &type);
 662                 if (rc < 0) {
 663                         CERROR("%s: Can not locate "DFID": rc = %d\n",
 664                                lod2obd(lod)->obd_name, PFID(fid), rc);
 665                         lod_object_free_striping(env, lo);
 666                         RETURN(rc);
 667                 }
 668                 objs[i].l_ost_idx = cpu_to_le32(index);
 669         }
 670
 671         info->lti_buf.lb_buf = lmm;
 672         info->lti_buf.lb_len = lmm_size;
 673         rc = dt_xattr_set(env, next, &info->lti_buf, XATTR_NAME_LOV, 0,
 674                           th, BYPASS_CAPA);
 675         if (rc < 0)
 676                 lod_object_free_striping(env, lo);
 677
 678         RETURN(rc);
 679 }
 680
 681 /**
 682  * Get LOV EA.
 683  *
 684  * Fill lti_ea_store buffer in the environment with a value for the given
 685  * EA. The buffer is reallocated if the value doesn't fit.
 686  *
 687  * \param[in,out] env           execution environment for this thread
 688  *                              .lti_ea_store buffer is filled with EA's value
 689  * \param[in] lo                LOD object
 690  * \param[in] name              name of the EA
 691  *
 692  * \retval                      0 if EA is fetched successfully
 693  * \retval                      negative error number on failure
 694  */
 695 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
 696                const char *name)
 697 {
 698         struct lod_thread_info  *info = lod_env_info(env);
 699         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 700         int                     rc;
 701         ENTRY;
 702
 703         LASSERT(info);
 704
 705         if (unlikely(info->lti_ea_store == NULL)) {
 706                 /* just to enter in allocation block below */
 707                 rc = -ERANGE;
 708         } else {
 709 repeat:
 710                 info->lti_buf.lb_buf = info->lti_ea_store;
 711                 info->lti_buf.lb_len = info->lti_ea_store_size;
 712                 rc = dt_xattr_get(env, next, &info->lti_buf, name, BYPASS_CAPA);
 713         }
 714
 715         /* if object is not striped or inaccessible */
 716         if (rc == -ENODATA || rc == -ENOENT)
 717                 RETURN(0);
 718
 719         if (rc == -ERANGE) {
 720                 /* EA doesn't fit, reallocate new buffer */
 721                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name,
 722                                   BYPASS_CAPA);
 723                 if (rc == -ENODATA || rc == -ENOENT)
 724                         RETURN(0);
 725                 else if (rc < 0)
 726                         RETURN(rc);
 727
 728                 LASSERT(rc > 0);
 729                 rc = lod_ea_store_resize(info, rc);
 730                 if (rc)
 731                         RETURN(rc);
 732                 goto repeat;
 733         }
 734
 735         RETURN(rc);
 736 }
 737
 738 /**
 739  * Verify the target index is present in the current configuration.
 740  *
 741  * \param[in] md                LOD device where the target table is stored
 742  * \param[in] idx               target's index
 743  *
 744  * \retval                      0 if the index is present
 745  * \retval                      -EINVAL if not
 746  */
 747 static int validate_lod_and_idx(struct lod_device *md, __u32 idx)
 748 {
 749         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
 750                      !cfs_bitmap_check(md->lod_ost_bitmap, idx))) {
 751                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
 752                        md->lod_ost_descs.ltd_tgts_size);
 753                 return -EINVAL;
 754         }
 755
 756         if (unlikely(OST_TGT(md, idx) == NULL)) {
 757                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
 758                        lod2obd(md)->obd_name, idx);
 759                 return -EINVAL;
 760         }
 761
 762         if (unlikely(OST_TGT(md, idx)->ltd_ost == NULL)) {
 763                 CERROR("%s: invalid lod device, for idx: %d\n",
 764                        lod2obd(md)->obd_name , idx);
 765                 return -EINVAL;
 766         }
 767
 768         return 0;
 769 }
 770
 771 /**
 772  * Instantiate objects for stripes.
 773  *
 774  * Allocate and initialize LU-objects representing the stripes. The number
 775  * of the stripes (ldo_stripenr) must be initialized already. The caller
 776  * must ensure nobody else is calling the function on the object at the same
 777  * time. FLDB service must be running to be able to map a FID to the targets
 778  * and find appropriate device representing that target.
 779  *
 780  * \param[in] env               execution environment for this thread
 781  * \param[in,out] lo            LOD object
 782  * \param[in] objs              an array of IDs to creates the objects from
 783  *
 784  * \retval                      0 if the objects are instantiated successfully
 785  * \retval                      negative error number on failure
 786  */
 787 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
 788                            struct lov_ost_data_v1 *objs)
 789 {
 790         struct lod_thread_info  *info = lod_env_info(env);
 791         struct lod_device       *md;
 792         struct lu_object        *o, *n;
 793         struct lu_device        *nd;
 794         struct dt_object       **stripe;
 795         int                      stripe_len;
 796         int                      i, rc = 0;
 797         __u32                   idx;
 798         ENTRY;
 799
 800         LASSERT(lo != NULL);
 801         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 802         LASSERT(lo->ldo_stripe == NULL);
 803         LASSERT(lo->ldo_stripenr > 0);
 804         LASSERT(lo->ldo_stripe_size > 0);
 805
 806         stripe_len = lo->ldo_stripenr;
 807         OBD_ALLOC(stripe, sizeof(stripe[0]) * stripe_len);
 808         if (stripe == NULL)
 809                 RETURN(-ENOMEM);
 810
 811         for (i = 0; i < lo->ldo_stripenr; i++) {
 812                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
 813                         continue;
 814
 815                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
 816                 idx = le32_to_cpu(objs[i].l_ost_idx);
 817                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
 818                 if (rc != 0)
 819                         GOTO(out, rc);
 820                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
 821                          PFID(&info->lti_fid));
 822                 lod_getref(&md->lod_ost_descs);
 823
 824                 rc = validate_lod_and_idx(md, idx);
 825                 if (unlikely(rc != 0)) {
 826                         lod_putref(md, &md->lod_ost_descs);
 827                         GOTO(out, rc);
 828                 }
 829
 830                 nd = &OST_TGT(md,idx)->ltd_ost->dd_lu_dev;
 831                 lod_putref(md, &md->lod_ost_descs);
 832
 833                 /* In the function below, .hs_keycmp resolves to
 834                  * u_obj_hop_keycmp() */
 835                 /* coverity[overrun-buffer-val] */
 836                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
 837                 if (IS_ERR(o))
 838                         GOTO(out, rc = PTR_ERR(o));
 839
 840                 n = lu_object_locate(o->lo_header, nd->ld_type);
 841                 LASSERT(n);
 842
 843                 stripe[i] = container_of(n, struct dt_object, do_lu);
 844         }
 845
 846 out:
 847         if (rc != 0) {
 848                 for (i = 0; i < stripe_len; i++)
 849                         if (stripe[i] != NULL)
 850                                 lu_object_put(env, &stripe[i]->do_lu);
 851
 852                 OBD_FREE(stripe, sizeof(stripe[0]) * stripe_len);
 853                 lo->ldo_stripenr = 0;
 854         } else {
 855                 lo->ldo_stripe = stripe;
 856                 lo->ldo_stripes_allocated = stripe_len;
 857         }
 858
 859         RETURN(rc);
 860 }
 861
 862 /**
 863  * Instantiate objects for striping.
 864  *
 865  * Parse striping information in \a buf and instantiate the objects
 866  * representing the stripes.
 867  *
 868  * \param[in] env               execution environment for this thread
 869  * \param[in] lo                LOD object
 870  * \param[in] buf               buffer storing LOV EA to parse
 871  *
 872  * \retval                      0 if parsing and objects creation succeed
 873  * \retval                      negative error number on failure
 874  */
 875 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
 876                        const struct lu_buf *buf)
 877 {
 878         struct lov_mds_md_v1    *lmm;
 879         struct lov_ost_data_v1  *objs;
 880         __u32                    magic;
 881         __u32                    pattern;
 882         int                      rc = 0;
 883         ENTRY;
 884
 885         LASSERT(buf);
 886         LASSERT(buf->lb_buf);
 887         LASSERT(buf->lb_len);
 888
 889         lmm = (struct lov_mds_md_v1 *) buf->lb_buf;
 890         magic = le32_to_cpu(lmm->lmm_magic);
 891         pattern = le32_to_cpu(lmm->lmm_pattern);
 892
 893         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3)
 894                 GOTO(out, rc = -EINVAL);
 895         if (lov_pattern(pattern) != LOV_PATTERN_RAID0)
 896                 GOTO(out, rc = -EINVAL);
 897
 898         lo->ldo_pattern = pattern;
 899         lo->ldo_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 900         lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 901         lo->ldo_stripenr = le16_to_cpu(lmm->lmm_stripe_count);
 902         /* released file stripenr fixup. */
 903         if (pattern & LOV_PATTERN_F_RELEASED)
 904                 lo->ldo_stripenr = 0;
 905
 906         LASSERT(buf->lb_len >= lov_mds_md_size(lo->ldo_stripenr, magic));
 907
 908         if (magic == LOV_MAGIC_V3) {
 909                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *) lmm;
 910                 objs = &v3->lmm_objects[0];
 911                 lod_object_set_pool(lo, v3->lmm_pool_name);
 912         } else {
 913                 objs = &lmm->lmm_objects[0];
 914         }
 915
 916         if (lo->ldo_stripenr > 0)
 917                 rc = lod_initialize_objects(env, lo, objs);
 918
 919 out:
 920         RETURN(rc);
 921 }
 922
 923 /**
 924  * Initialize the object representing the stripes.
 925  *
 926  * Unless the stripes are initialized already, fetch LOV (for regular
 927  * objects) or LMV (for directory objects) EA and call lod_parse_striping()
 928  * to instantiate the objects representing the stripes.
 929  *
 930  * \param[in] env               execution environment for this thread
 931  * \param[in,out] lo            LOD object
 932  *
 933  * \retval                      0 if parsing and object creation succeed
 934  * \retval                      negative error number on failure
 935  */
 936 int lod_load_striping_locked(const struct lu_env *env, struct lod_object *lo)
 937 {
 938         struct lod_thread_info  *info = lod_env_info(env);
 939         struct lu_buf           *buf  = &info->lti_buf;
 940         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 941         int                      rc = 0;
 942         ENTRY;
 943
 944         /* already initialized? */
 945         if (lo->ldo_stripe != NULL)
 946                 GOTO(out, rc = 0);
 947
 948         if (!dt_object_exists(next))
 949                 GOTO(out, rc = 0);
 950
 951         /* Do not load stripe for slaves of striped dir */
 952         if (lo->ldo_dir_slave_stripe)
 953                 GOTO(out, rc = 0);
 954
 955         if (S_ISREG(lu_object_attr(lod2lu_obj(lo)))) {
 956                 rc = lod_get_lov_ea(env, lo);
 957                 if (rc <= 0)
 958                         GOTO(out, rc);
 959                 /*
 960                  * there is LOV EA (striping information) in this object
 961                  * let's parse it and create in-core objects for the stripes
 962                  */
 963                 buf->lb_buf = info->lti_ea_store;
 964                 buf->lb_len = info->lti_ea_store_size;
 965                 rc = lod_parse_striping(env, lo, buf);
 966         } else if (S_ISDIR(lu_object_attr(lod2lu_obj(lo)))) {
 967                 rc = lod_get_lmv_ea(env, lo);
 968                 if (rc < (typeof(rc))sizeof(struct lmv_mds_md_v1))
 969                         GOTO(out, rc = rc > 0 ? -EINVAL : rc);
 970
 971                 buf->lb_buf = info->lti_ea_store;
 972                 buf->lb_len = info->lti_ea_store_size;
 973                 if (rc == sizeof(struct lmv_mds_md_v1)) {
 974                         rc = lod_load_lmv_shards(env, lo, buf, true);
 975                         if (buf->lb_buf != info->lti_ea_store) {
 976                                 OBD_FREE_LARGE(info->lti_ea_store,
 977                                                info->lti_ea_store_size);
 978                                 info->lti_ea_store = buf->lb_buf;
 979                                 info->lti_ea_store_size = buf->lb_len;
 980                         }
 981
 982                         if (rc < 0)
 983                                 GOTO(out, rc);
 984                 }
 985
 986                 /*
 987                  * there is LOV EA (striping information) in this object
 988                  * let's parse it and create in-core objects for the stripes
 989                  */
 990                 rc = lod_parse_dir_striping(env, lo, buf);
 991         }
 992
 993         if (rc == 0)
 994                 lo->ldo_striping_cached = 1;
 995 out:
 996         RETURN(rc);
 997 }
 998
 999 /**
1000  * A generic function to initialize the stripe objects.
1001  *
1002  * A protected version of lod_load_striping_locked() - load the striping
1003  * information from storage, parse that and instantiate LU objects to
1004  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1005  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1006  * return an array of references to the newly instantiated objects.
1007  *
1008  * \param[in] env               execution environment for this thread
1009  * \param[in,out] lo            LOD object, where striping is stored and
1010  *                              which gets an array of references
1011  *
1012  * \retval                      0 if parsing and object creation succeed
1013  * \retval                      negative error number on failure
1014  **/
1015 int lod_load_striping(const struct lu_env *env, struct lod_object *lo)
1016 {
1017         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
1018         int                     rc = 0;
1019
1020         /* currently this code is supposed to be called from declaration
1021          * phase only, thus the object is not expected to be locked by caller */
1022         dt_write_lock(env, next, 0);
1023         rc = lod_load_striping_locked(env, lo);
1024         dt_write_unlock(env, next);
1025         return rc;
1026 }
1027
1028 /**
1029  * Verify striping.
1030  *
1031  * Check the validity of all fields including the magic, stripe size,
1032  * stripe count, stripe offset and that the pool is present.  Also check
1033  * that each target index points to an existing target. The additional
1034  * \a is_from_disk turns additional checks. In some cases zero fields
1035  * are allowed (like pattern=0).
1036  *
1037  * \param[in] d                 LOD device
1038  * \param[in] buf               buffer with LOV EA to verify
1039  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1040  *                              1 - from disk, do not allow
1041  *
1042  * \retval                      0 if the striping is valid
1043  * \retval                      -EINVAL if striping is invalid
1044  */
1045 int lod_verify_striping(struct lod_device *d, const struct lu_buf *buf,
1046                         bool is_from_disk)
1047 {
1048         struct lov_user_md_v1   *lum;
1049         struct lov_user_md_v3   *lum3;
1050         struct pool_desc        *pool = NULL;
1051         __u32                    magic;
1052         __u32                    stripe_size;
1053         __u16                    stripe_count;
1054         __u16                    stripe_offset;
1055         size_t                   lum_size;
1056         int                      rc = 0;
1057         ENTRY;
1058
1059         lum = buf->lb_buf;
1060
1061         LASSERT(sizeof(*lum) < sizeof(*lum3));
1062
1063         if (buf->lb_len < sizeof(*lum)) {
1064                 CDEBUG(D_IOCTL, "buf len %zu too small for lov_user_md\n",
1065                        buf->lb_len);
1066                 GOTO(out, rc = -EINVAL);
1067         }
1068
1069         magic = le32_to_cpu(lum->lmm_magic);
1070         if (magic != LOV_USER_MAGIC_V1 &&
1071             magic != LOV_USER_MAGIC_V3 &&
1072             magic != LOV_MAGIC_V1_DEF &&
1073             magic != LOV_MAGIC_V3_DEF) {
1074                 CDEBUG(D_IOCTL, "bad userland LOV MAGIC: %#x\n", magic);
1075                 GOTO(out, rc = -EINVAL);
1076         }
1077
1078         /* the user uses "0" for default stripe pattern normally. */
1079         if (!is_from_disk && lum->lmm_pattern == 0)
1080                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1081
1082         if (le32_to_cpu(lum->lmm_pattern) != LOV_PATTERN_RAID0) {
1083                 CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n",
1084                        le32_to_cpu(lum->lmm_pattern));
1085                 GOTO(out, rc = -EINVAL);
1086         }
1087
1088         /* 64kB is the largest common page size we see (ia64), and matches the
1089          * check in lfs */
1090         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1091         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1092                 CDEBUG(D_IOCTL, "stripe size %u not a multiple of %u\n",
1093                        stripe_size, LOV_MIN_STRIPE_SIZE);
1094                 GOTO(out, rc = -EINVAL);
1095         }
1096
1097         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1098         if (stripe_offset != LOV_OFFSET_DEFAULT) {
1099                 /* if offset is not within valid range [0, osts_size) */
1100                 if (stripe_offset >= d->lod_osts_size) {
1101                         CDEBUG(D_IOCTL, "stripe offset %u >= bitmap size %u\n",
1102                                stripe_offset, d->lod_osts_size);
1103                         GOTO(out, rc = -EINVAL);
1104                 }
1105
1106                 /* if lmm_stripe_offset is *not* in bitmap */
1107                 if (!cfs_bitmap_check(d->lod_ost_bitmap, stripe_offset)) {
1108                         CDEBUG(D_IOCTL, "stripe offset %u not in bitmap\n",
1109                                stripe_offset);
1110                         GOTO(out, rc = -EINVAL);
1111                 }
1112         }
1113
1114         if (magic == LOV_USER_MAGIC_V1 || magic == LOV_MAGIC_V1_DEF)
1115                 lum_size = offsetof(struct lov_user_md_v1,
1116                                     lmm_objects[0]);
1117         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_MAGIC_V3_DEF)
1118                 lum_size = offsetof(struct lov_user_md_v3,
1119                                     lmm_objects[0]);
1120         else
1121                 GOTO(out, rc = -EINVAL);
1122
1123         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1124         if (buf->lb_len != lum_size) {
1125                 CDEBUG(D_IOCTL, "invalid buf len %zu for lov_user_md with "
1126                        "magic %#x and stripe_count %u\n",
1127                        buf->lb_len, magic, stripe_count);
1128                 GOTO(out, rc = -EINVAL);
1129         }
1130
1131         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_MAGIC_V3_DEF))
1132                 goto out;
1133
1134         lum3 = buf->lb_buf;
1135         if (buf->lb_len < sizeof(*lum3)) {
1136                 CDEBUG(D_IOCTL, "buf len %zu too small for lov_user_md_v3\n",
1137                        buf->lb_len);
1138                 GOTO(out, rc = -EINVAL);
1139         }
1140
1141         /* In the function below, .hs_keycmp resolves to
1142          * pool_hashkey_keycmp() */
1143         /* coverity[overrun-buffer-val] */
1144         pool = lod_find_pool(d, lum3->lmm_pool_name);
1145         if (pool == NULL)
1146                 goto out;
1147
1148         if (stripe_offset != LOV_OFFSET_DEFAULT) {
1149                 rc = lod_check_index_in_pool(stripe_offset, pool);
1150                 if (rc < 0)
1151                         GOTO(out, rc = -EINVAL);
1152         }
1153
1154         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1155                 CDEBUG(D_IOCTL,
1156                        "stripe count %u > # OSTs %u in the pool\n",
1157                        stripe_count, pool_tgt_count(pool));
1158                 GOTO(out, rc = -EINVAL);
1159         }
1160
1161 out:
1162         if (pool != NULL)
1163                 lod_pool_putref(pool);
1164
1165         RETURN(rc);
1166 }
1167
1168 void lod_fix_desc_stripe_size(__u64 *val)
1169 {
1170         if (*val < LOV_MIN_STRIPE_SIZE) {
1171                 if (*val != 0)
1172                         LCONSOLE_INFO("Increasing default stripe size to "
1173                                       "minimum value %u\n",
1174                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
1175                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
1176         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
1177                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
1178                 LCONSOLE_WARN("Changing default stripe size to "LPU64" (a "
1179                               "multiple of %u)\n",
1180                               *val, LOV_MIN_STRIPE_SIZE);
1181         }
1182 }
1183
1184 void lod_fix_desc_stripe_count(__u32 *val)
1185 {
1186         if (*val == 0)
1187                 *val = 1;
1188 }
1189
1190 void lod_fix_desc_pattern(__u32 *val)
1191 {
1192         /* from lov_setstripe */
1193         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
1194                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
1195                 *val = 0;
1196         }
1197 }
1198
1199 void lod_fix_desc_qos_maxage(__u32 *val)
1200 {
1201         /* fix qos_maxage */
1202         if (*val == 0)
1203                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
1204 }
1205
1206 /**
1207  * Used to fix insane default striping.
1208  *
1209  * \param[in] desc      striping description
1210  */
1211 void lod_fix_desc(struct lov_desc *desc)
1212 {
1213         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
1214         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
1215         lod_fix_desc_pattern(&desc->ld_pattern);
1216         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
1217 }
1218
1219 /**
1220  * Initialize the structures used to store pools and default striping.
1221  *
1222  * \param[in] lod       LOD device
1223  * \param[in] lcfg      configuration structure storing default striping.
1224  *
1225  * \retval              0 if initialization succeeds
1226  * \retval              negative error number on failure
1227  */
1228 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
1229 {
1230         struct obd_device          *obd;
1231         struct lov_desc            *desc;
1232         int                         rc;
1233         ENTRY;
1234
1235         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1236         LASSERT(obd != NULL);
1237         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
1238
1239         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1240                 CERROR("LOD setup requires a descriptor\n");
1241                 RETURN(-EINVAL);
1242         }
1243
1244         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
1245
1246         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1247                 CERROR("descriptor size wrong: %d > %d\n",
1248                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1249                 RETURN(-EINVAL);
1250         }
1251
1252         if (desc->ld_magic != LOV_DESC_MAGIC) {
1253                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
1254                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
1255                                obd->obd_name, desc);
1256                         lustre_swab_lov_desc(desc);
1257                 } else {
1258                         CERROR("%s: Bad lov desc magic: %#x\n",
1259                                obd->obd_name, desc->ld_magic);
1260                         RETURN(-EINVAL);
1261                 }
1262         }
1263
1264         lod_fix_desc(desc);
1265
1266         desc->ld_active_tgt_count = 0;
1267         lod->lod_desc = *desc;
1268
1269         lod->lod_sp_me = LUSTRE_SP_CLI;
1270
1271         /* Set up allocation policy (QoS and RR) */
1272         INIT_LIST_HEAD(&lod->lod_qos.lq_oss_list);
1273         init_rwsem(&lod->lod_qos.lq_rw_sem);
1274         lod->lod_qos.lq_dirty = 1;
1275         lod->lod_qos.lq_rr.lqr_dirty = 1;
1276         lod->lod_qos.lq_reset = 1;
1277         /* Default priority is toward free space balance */
1278         lod->lod_qos.lq_prio_free = 232;
1279         /* Default threshold for rr (roughly 17%) */
1280         lod->lod_qos.lq_threshold_rr = 43;
1281
1282         /* Set up OST pool environment */
1283         lod->lod_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
1284                                                    HASH_POOLS_MAX_BITS,
1285                                                    HASH_POOLS_BKT_BITS, 0,
1286                                                    CFS_HASH_MIN_THETA,
1287                                                    CFS_HASH_MAX_THETA,
1288                                                    &pool_hash_operations,
1289                                                    CFS_HASH_DEFAULT);
1290         if (lod->lod_pools_hash_body == NULL)
1291                 RETURN(-ENOMEM);
1292
1293         INIT_LIST_HEAD(&lod->lod_pool_list);
1294         lod->lod_pool_count = 0;
1295         rc = lod_ost_pool_init(&lod->lod_pool_info, 0);
1296         if (rc)
1297                 GOTO(out_hash, rc);
1298         rc = lod_ost_pool_init(&lod->lod_qos.lq_rr.lqr_pool, 0);
1299         if (rc)
1300                 GOTO(out_pool_info, rc);
1301
1302         RETURN(0);
1303
1304 out_pool_info:
1305         lod_ost_pool_free(&lod->lod_pool_info);
1306 out_hash:
1307         cfs_hash_putref(lod->lod_pools_hash_body);
1308
1309         return rc;
1310 }
1311
1312 /**
1313  * Release the structures describing the pools.
1314  *
1315  * \param[in] lod       LOD device from which we release the structures
1316  *
1317  * \retval              0 always
1318  */
1319 int lod_pools_fini(struct lod_device *lod)
1320 {
1321         struct obd_device   *obd = lod2obd(lod);
1322         struct pool_desc    *pool, *tmp;
1323         ENTRY;
1324
1325         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
1326                 /* free pool structs */
1327                 CDEBUG(D_INFO, "delete pool %p\n", pool);
1328                 /* In the function below, .hs_keycmp resolves to
1329                  * pool_hashkey_keycmp() */
1330                 /* coverity[overrun-buffer-val] */
1331                 lod_pool_del(obd, pool->pool_name);
1332         }
1333
1334         cfs_hash_putref(lod->lod_pools_hash_body);
1335         lod_ost_pool_free(&(lod->lod_qos.lq_rr.lqr_pool));
1336         lod_ost_pool_free(&lod->lod_pool_info);
1337
1338         RETURN(0);
1339 }