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         bool lock = false;
 221         ENTRY;
 222
 223         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, index, gen);
 224
 225         if (gen <= 0) {
 226                 CERROR("request to add OBD %s with invalid generation: %d\n",
 227                        osp, gen);
 228                 RETURN(-EINVAL);
 229         }
 230
 231         obd_str2uuid(&obd_uuid, osp);
 232
 233         obd = class_find_client_obd(&obd_uuid, LUSTRE_OSP_NAME,
 234                                 &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 235         if (obd == NULL) {
 236                 CERROR("can't find %s device\n", osp);
 237                 RETURN(-EINVAL);
 238         }
 239
 240         OBD_ALLOC_PTR(data);
 241         if (data == NULL)
 242                 RETURN(-ENOMEM);
 243
 244         data->ocd_connect_flags = OBD_CONNECT_INDEX | OBD_CONNECT_VERSION;
 245         data->ocd_version = LUSTRE_VERSION_CODE;
 246         data->ocd_index = index;
 247
 248         if (strcmp(LUSTRE_OSC_NAME, type) == 0) {
 249                 for_ost = true;
 250                 data->ocd_connect_flags |= OBD_CONNECT_AT |
 251                                            OBD_CONNECT_FULL20 |
 252                                            OBD_CONNECT_INDEX |
 253 #ifdef HAVE_LRU_RESIZE_SUPPORT
 254                                            OBD_CONNECT_LRU_RESIZE |
 255 #endif
 256                                            OBD_CONNECT_MDS |
 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                                            OBD_CONNECT_BULK_MBITS;
 265
 266                 data->ocd_group = tgt_index;
 267                 ltd = &lod->lod_ost_descs;
 268         } else {
 269                 struct obd_import *imp = obd->u.cli.cl_import;
 270
 271                 for_ost = false;
 272                 data->ocd_ibits_known = MDS_INODELOCK_UPDATE;
 273                 data->ocd_connect_flags |= OBD_CONNECT_ACL |
 274                                            OBD_CONNECT_IBITS |
 275                                            OBD_CONNECT_MDS_MDS |
 276                                            OBD_CONNECT_FID |
 277                                            OBD_CONNECT_AT |
 278                                            OBD_CONNECT_FULL20 |
 279                                            OBD_CONNECT_LFSCK |
 280                                            OBD_CONNECT_BULK_MBITS;
 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         lock = true;
 338         if (cfs_bitmap_check(ltd->ltd_tgt_bitmap, index)) {
 339                 CERROR("%s: device %d is registered already\n", obd->obd_name,
 340                        index);
 341                 GOTO(out_mutex, rc = -EEXIST);
 342         }
 343
 344         if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 345                 OBD_ALLOC_PTR(ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK]);
 346                 if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 347                         CERROR("can't allocate index to add %s\n",
 348                                obd->obd_name);
 349                         GOTO(out_mutex, rc = -ENOMEM);
 350                 }
 351         }
 352
 353         if (for_ost) {
 354                 /* pool and qos are not supported for MDS stack yet */
 355                 rc = lod_ost_pool_add(&lod->lod_pool_info, index,
 356                                       lod->lod_osts_size);
 357                 if (rc) {
 358                         CERROR("%s: can't set up pool, failed with %d\n",
 359                                obd->obd_name, rc);
 360                         GOTO(out_mutex, rc);
 361                 }
 362
 363                 rc = qos_add_tgt(lod, tgt_desc);
 364                 if (rc) {
 365                         CERROR("%s: qos_add_tgt failed with %d\n",
 366                                 obd->obd_name, rc);
 367                         GOTO(out_pool, rc);
 368                 }
 369
 370                 /* The new OST is now a full citizen */
 371                 if (index >= lod->lod_desc.ld_tgt_count)
 372                         lod->lod_desc.ld_tgt_count = index + 1;
 373                 if (active)
 374                         lod->lod_desc.ld_active_tgt_count++;
 375         }
 376
 377         LTD_TGT(ltd, index) = tgt_desc;
 378         cfs_bitmap_set(ltd->ltd_tgt_bitmap, index);
 379         ltd->ltd_tgtnr++;
 380         mutex_unlock(&ltd->ltd_mutex);
 381         lod_putref(lod, ltd);
 382         lock = false;
 383         if (lod->lod_recovery_completed)
 384                 ldev->ld_ops->ldo_recovery_complete(env, ldev);
 385
 386         if (!for_ost && lod->lod_initialized) {
 387                 rc = lod_sub_init_llog(env, lod, tgt_desc->ltd_tgt);
 388                 if (rc != 0) {
 389                         CERROR("%s: cannot start llog on %s:rc = %d\n",
 390                                lod2obd(lod)->obd_name, osp, rc);
 391                         GOTO(out_pool, rc);
 392                 }
 393         }
 394
 395         rc = lfsck_add_target(env, lod->lod_child, d, exp, index, for_ost);
 396         if (rc != 0) {
 397                 CERROR("Fail to add LFSCK target: name = %s, type = %s, "
 398                        "index = %u, rc = %d\n", osp, type, index, rc);
 399                 GOTO(out_fini_llog, rc);
 400         }
 401         RETURN(rc);
 402 out_fini_llog:
 403         lod_sub_fini_llog(env, tgt_desc->ltd_tgt,
 404                           tgt_desc->ltd_recovery_thread);
 405 out_pool:
 406         lod_ost_pool_remove(&lod->lod_pool_info, index);
 407 out_mutex:
 408         if (lock) {
 409                 mutex_unlock(&ltd->ltd_mutex);
 410                 lod_putref(lod, ltd);
 411         }
 412 out_desc:
 413         OBD_FREE_PTR(tgt_desc);
 414 out_conn:
 415         obd_disconnect(exp);
 416 out_free:
 417         return rc;
 418 }
 419
 420 /**
 421  * Schedule target removal from the target table.
 422  *
 423  * Mark the device as dead. The device is not removed here because it may
 424  * still be in use. The device will be removed in lod_putref() when the
 425  * last reference is released.
 426  *
 427  * \param[in] env               execution environment for this thread
 428  * \param[in] lod               LOD device the target table belongs to
 429  * \param[in] ltd               target table
 430  * \param[in] idx               index of the target
 431  * \param[in] for_ost           type of the target: 0 - MDT, 1 - OST
 432  */
 433 static void __lod_del_device(const struct lu_env *env, struct lod_device *lod,
 434                              struct lod_tgt_descs *ltd, unsigned idx,
 435                              bool for_ost)
 436 {
 437         LASSERT(LTD_TGT(ltd, idx));
 438
 439         lfsck_del_target(env, lod->lod_child, LTD_TGT(ltd, idx)->ltd_tgt,
 440                          idx, for_ost);
 441
 442         if (!for_ost && LTD_TGT(ltd, idx)->ltd_recovery_thread != NULL) {
 443                 struct ptlrpc_thread *thread;
 444
 445                 thread = LTD_TGT(ltd, idx)->ltd_recovery_thread;
 446                 OBD_FREE_PTR(thread);
 447         }
 448
 449         if (LTD_TGT(ltd, idx)->ltd_reap == 0) {
 450                 LTD_TGT(ltd, idx)->ltd_reap = 1;
 451                 ltd->ltd_death_row++;
 452         }
 453 }
 454
 455 /**
 456  * Schedule removal of all the targets from the given target table.
 457  *
 458  * See more details in the description for __lod_del_device()
 459  *
 460  * \param[in] env               execution environment for this thread
 461  * \param[in] lod               LOD device the target table belongs to
 462  * \param[in] ltd               target table
 463  * \param[in] for_ost           type of the target: MDT or OST
 464  *
 465  * \retval                      0 always
 466  */
 467 int lod_fini_tgt(const struct lu_env *env, struct lod_device *lod,
 468                  struct lod_tgt_descs *ltd, bool for_ost)
 469 {
 470         unsigned int idx;
 471
 472         if (ltd->ltd_tgts_size <= 0)
 473                 return 0;
 474         lod_getref(ltd);
 475         mutex_lock(&ltd->ltd_mutex);
 476         cfs_foreach_bit(ltd->ltd_tgt_bitmap, idx)
 477                 __lod_del_device(env, lod, ltd, idx, for_ost);
 478         mutex_unlock(&ltd->ltd_mutex);
 479         lod_putref(lod, ltd);
 480         CFS_FREE_BITMAP(ltd->ltd_tgt_bitmap);
 481         for (idx = 0; idx < TGT_PTRS; idx++) {
 482                 if (ltd->ltd_tgt_idx[idx])
 483                         OBD_FREE_PTR(ltd->ltd_tgt_idx[idx]);
 484         }
 485         ltd->ltd_tgts_size = 0;
 486         return 0;
 487 }
 488
 489 /**
 490  * Remove device by name.
 491  *
 492  * Remove a device identified by \a osp from the target table. Given
 493  * the device can be in use, the real deletion happens in lod_putref().
 494  *
 495  * \param[in] env               execution environment for this thread
 496  * \param[in] lod               LOD device to be connected to the new OSP
 497  * \param[in] ltd               target table
 498  * \param[in] osp               name of OSP device to be removed
 499  * \param[in] idx               index of the target
 500  * \param[in] gen               generation number, not used currently
 501  * \param[in] for_ost           type of the target: 0 - MDT, 1 - OST
 502  *
 503  * \retval                      0 if the device was scheduled for removal
 504  * \retval                      -EINVAL if no device was found
 505  */
 506 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
 507                    struct lod_tgt_descs *ltd, char *osp, unsigned idx,
 508                    unsigned gen, bool for_ost)
 509 {
 510         struct obd_device *obd;
 511         int                rc = 0;
 512         struct obd_uuid    uuid;
 513         ENTRY;
 514
 515         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
 516
 517         obd_str2uuid(&uuid, osp);
 518
 519         obd = class_find_client_obd(&uuid, LUSTRE_OSP_NAME,
 520                                    &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 521         if (obd == NULL) {
 522                 CERROR("can't find %s device\n", osp);
 523                 RETURN(-EINVAL);
 524         }
 525
 526         if (gen <= 0) {
 527                 CERROR("%s: request to remove OBD %s with invalid generation %d"
 528                        "\n", obd->obd_name, osp, gen);
 529                 RETURN(-EINVAL);
 530         }
 531
 532         obd_str2uuid(&uuid,  osp);
 533
 534         lod_getref(ltd);
 535         mutex_lock(&ltd->ltd_mutex);
 536         /* check that the index is allocated in the bitmap */
 537         if (!cfs_bitmap_check(ltd->ltd_tgt_bitmap, idx) ||
 538             !LTD_TGT(ltd, idx)) {
 539                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
 540                 GOTO(out, rc = -EINVAL);
 541         }
 542
 543         /* check that the UUID matches */
 544         if (!obd_uuid_equals(&uuid, &LTD_TGT(ltd, idx)->ltd_uuid)) {
 545                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
 546                        obd->obd_name, obd_uuid2str(&LTD_TGT(ltd,idx)->ltd_uuid),
 547                        idx, osp);
 548                 GOTO(out, rc = -EINVAL);
 549         }
 550
 551         __lod_del_device(env, lod, ltd, idx, for_ost);
 552         EXIT;
 553 out:
 554         mutex_unlock(&ltd->ltd_mutex);
 555         lod_putref(lod, ltd);
 556         return(rc);
 557 }
 558
 559 /**
 560  * Resize per-thread storage to hold specified size.
 561  *
 562  * A helper function to resize per-thread temporary storage. This storage
 563  * is used to process LOV/LVM EAs and may be quite large. We do not want to
 564  * allocate/release it every time, so instead we put it into the env and
 565  * reallocate on demand. The memory is released when the correspondent thread
 566  * is finished.
 567  *
 568  * \param[in] info              LOD-specific storage in the environment
 569  * \param[in] size              new size to grow the buffer to
 570
 571  * \retval                      0 on success, -ENOMEM if reallocation failed
 572  */
 573 int lod_ea_store_resize(struct lod_thread_info *info, size_t size)
 574 {
 575         __u32 round = size_roundup_power2(size);
 576
 577         LASSERT(round <=
 578                 lov_mds_md_size(LOV_MAX_STRIPE_COUNT, LOV_MAGIC_V3));
 579         if (info->lti_ea_store) {
 580                 LASSERT(info->lti_ea_store_size);
 581                 LASSERT(info->lti_ea_store_size < round);
 582                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
 583                        info->lti_ea_store_size, round);
 584                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
 585                 info->lti_ea_store = NULL;
 586                 info->lti_ea_store_size = 0;
 587         }
 588
 589         OBD_ALLOC_LARGE(info->lti_ea_store, round);
 590         if (info->lti_ea_store == NULL)
 591                 RETURN(-ENOMEM);
 592         info->lti_ea_store_size = round;
 593         RETURN(0);
 594 }
 595
 596 /**
 597  * Make LOV EA for striped object.
 598  *
 599  * Generate striping information and store it in the LOV EA of the given
 600  * object. The caller must ensure nobody else is calling the function
 601  * against the object concurrently. The transaction must be started.
 602  * FLDB service must be running as well; it's used to map FID to the target,
 603  * which is stored in LOV EA.
 604  *
 605  * \param[in] env               execution environment for this thread
 606  * \param[in] lo                LOD object
 607  * \param[in] th                transaction handle
 608  *
 609  * \retval                      0 if LOV EA is stored successfully
 610  * \retval                      negative error number on failure
 611  */
 612 int lod_generate_and_set_lovea(const struct lu_env *env,
 613                                struct lod_object *lo, struct thandle *th)
 614 {
 615         struct lod_thread_info  *info = lod_env_info(env);
 616         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 617         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
 618         struct lov_mds_md_v1    *lmm;
 619         struct lov_ost_data_v1  *objs;
 620         __u32                    magic;
 621         int                      i, rc;
 622         size_t                   lmm_size;
 623         ENTRY;
 624
 625         LASSERT(lo);
 626
 627         magic = lo->ldo_pool != NULL ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
 628         lmm_size = lov_mds_md_size(lo->ldo_stripenr, magic);
 629         if (info->lti_ea_store_size < lmm_size) {
 630                 rc = lod_ea_store_resize(info, lmm_size);
 631                 if (rc)
 632                         RETURN(rc);
 633         }
 634
 635         if (lo->ldo_pattern == 0) /* default striping */
 636                 lo->ldo_pattern = LOV_PATTERN_RAID0;
 637
 638         lmm = info->lti_ea_store;
 639
 640         lmm->lmm_magic = cpu_to_le32(magic);
 641         lmm->lmm_pattern = cpu_to_le32(lo->ldo_pattern);
 642         fid_to_lmm_oi(fid, &lmm->lmm_oi);
 643         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
 644                 lmm->lmm_oi.oi.oi_id++;
 645         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
 646         lmm->lmm_stripe_size = cpu_to_le32(lo->ldo_stripe_size);
 647         lmm->lmm_stripe_count = cpu_to_le16(lo->ldo_stripenr);
 648         if (lo->ldo_pattern & LOV_PATTERN_F_RELEASED)
 649                 lmm->lmm_stripe_count = cpu_to_le16(lo->ldo_released_stripenr);
 650         lmm->lmm_layout_gen = 0;
 651         if (magic == LOV_MAGIC_V1) {
 652                 objs = &lmm->lmm_objects[0];
 653         } else {
 654                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *) lmm;
 655                 size_t cplen = strlcpy(v3->lmm_pool_name, lo->ldo_pool,
 656                                 sizeof(v3->lmm_pool_name));
 657                 if (cplen >= sizeof(v3->lmm_pool_name))
 658                         RETURN(-E2BIG);
 659                 objs = &v3->lmm_objects[0];
 660         }
 661
 662         for (i = 0; i < lo->ldo_stripenr; i++) {
 663                 struct lu_fid           *fid    = &info->lti_fid;
 664                 struct lod_device       *lod;
 665                 __u32                   index;
 666                 int                     type    = LU_SEQ_RANGE_OST;
 667
 668                 lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 669                 LASSERT(lo->ldo_stripe[i]);
 670
 671                 *fid = *lu_object_fid(&lo->ldo_stripe[i]->do_lu);
 672                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF)) {
 673                         if (cfs_fail_val == 0)
 674                                 cfs_fail_val = fid->f_oid;
 675                         else
 676                                 fid->f_oid = cfs_fail_val;
 677                 }
 678
 679                 rc = fid_to_ostid(fid, &info->lti_ostid);
 680                 LASSERT(rc == 0);
 681
 682                 ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 683                 objs[i].l_ost_gen    = cpu_to_le32(0);
 684                 rc = lod_fld_lookup(env, lod, fid, &index, &type);
 685                 if (rc < 0) {
 686                         CERROR("%s: Can not locate "DFID": rc = %d\n",
 687                                lod2obd(lod)->obd_name, PFID(fid), rc);
 688                         lod_object_free_striping(env, lo);
 689                         RETURN(rc);
 690                 }
 691                 objs[i].l_ost_idx = cpu_to_le32(index);
 692         }
 693
 694         info->lti_buf.lb_buf = lmm;
 695         info->lti_buf.lb_len = lmm_size;
 696         rc = lod_sub_object_xattr_set(env, next, &info->lti_buf, XATTR_NAME_LOV,
 697                                       0, th);
 698         if (rc < 0) {
 699                 lod_object_free_striping(env, lo);
 700                 RETURN(rc);
 701         }
 702
 703         RETURN(rc);
 704 }
 705
 706 /**
 707  * Get LOV EA.
 708  *
 709  * Fill lti_ea_store buffer in the environment with a value for the given
 710  * EA. The buffer is reallocated if the value doesn't fit.
 711  *
 712  * \param[in,out] env           execution environment for this thread
 713  *                              .lti_ea_store buffer is filled with EA's value
 714  * \param[in] lo                LOD object
 715  * \param[in] name              name of the EA
 716  *
 717  * \retval                      0 if EA is fetched successfully
 718  * \retval                      negative error number on failure
 719  */
 720 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
 721                const char *name)
 722 {
 723         struct lod_thread_info  *info = lod_env_info(env);
 724         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 725         int                     rc;
 726         ENTRY;
 727
 728         LASSERT(info);
 729
 730         if (unlikely(info->lti_ea_store == NULL)) {
 731                 /* just to enter in allocation block below */
 732                 rc = -ERANGE;
 733         } else {
 734 repeat:
 735                 info->lti_buf.lb_buf = info->lti_ea_store;
 736                 info->lti_buf.lb_len = info->lti_ea_store_size;
 737                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
 738         }
 739
 740         /* if object is not striped or inaccessible */
 741         if (rc == -ENODATA || rc == -ENOENT)
 742                 RETURN(0);
 743
 744         if (rc == -ERANGE) {
 745                 /* EA doesn't fit, reallocate new buffer */
 746                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
 747                 if (rc == -ENODATA || rc == -ENOENT)
 748                         RETURN(0);
 749                 else if (rc < 0)
 750                         RETURN(rc);
 751
 752                 LASSERT(rc > 0);
 753                 rc = lod_ea_store_resize(info, rc);
 754                 if (rc)
 755                         RETURN(rc);
 756                 goto repeat;
 757         }
 758
 759         RETURN(rc);
 760 }
 761
 762 /**
 763  * Verify the target index is present in the current configuration.
 764  *
 765  * \param[in] md                LOD device where the target table is stored
 766  * \param[in] idx               target's index
 767  *
 768  * \retval                      0 if the index is present
 769  * \retval                      -EINVAL if not
 770  */
 771 static int validate_lod_and_idx(struct lod_device *md, __u32 idx)
 772 {
 773         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
 774                      !cfs_bitmap_check(md->lod_ost_bitmap, idx))) {
 775                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
 776                        md->lod_ost_descs.ltd_tgts_size);
 777                 return -EINVAL;
 778         }
 779
 780         if (unlikely(OST_TGT(md, idx) == NULL)) {
 781                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
 782                        lod2obd(md)->obd_name, idx);
 783                 return -EINVAL;
 784         }
 785
 786         if (unlikely(OST_TGT(md, idx)->ltd_ost == NULL)) {
 787                 CERROR("%s: invalid lod device, for idx: %d\n",
 788                        lod2obd(md)->obd_name , idx);
 789                 return -EINVAL;
 790         }
 791
 792         return 0;
 793 }
 794
 795 /**
 796  * Instantiate objects for stripes.
 797  *
 798  * Allocate and initialize LU-objects representing the stripes. The number
 799  * of the stripes (ldo_stripenr) must be initialized already. The caller
 800  * must ensure nobody else is calling the function on the object at the same
 801  * time. FLDB service must be running to be able to map a FID to the targets
 802  * and find appropriate device representing that target.
 803  *
 804  * \param[in] env               execution environment for this thread
 805  * \param[in,out] lo            LOD object
 806  * \param[in] objs              an array of IDs to creates the objects from
 807  *
 808  * \retval                      0 if the objects are instantiated successfully
 809  * \retval                      negative error number on failure
 810  */
 811 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
 812                            struct lov_ost_data_v1 *objs)
 813 {
 814         struct lod_thread_info  *info = lod_env_info(env);
 815         struct lod_device       *md;
 816         struct lu_object        *o, *n;
 817         struct lu_device        *nd;
 818         struct dt_object       **stripe;
 819         int                      stripe_len;
 820         int                      i, rc = 0;
 821         __u32                   idx;
 822         ENTRY;
 823
 824         LASSERT(lo != NULL);
 825         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 826         LASSERT(lo->ldo_stripe == NULL);
 827         LASSERT(lo->ldo_stripenr > 0);
 828         LASSERT(lo->ldo_stripe_size > 0);
 829
 830         stripe_len = lo->ldo_stripenr;
 831         OBD_ALLOC(stripe, sizeof(stripe[0]) * stripe_len);
 832         if (stripe == NULL)
 833                 RETURN(-ENOMEM);
 834
 835         for (i = 0; i < lo->ldo_stripenr; i++) {
 836                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
 837                         continue;
 838
 839                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
 840                 idx = le32_to_cpu(objs[i].l_ost_idx);
 841                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
 842                 if (rc != 0)
 843                         GOTO(out, rc);
 844                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
 845                          PFID(&info->lti_fid));
 846                 lod_getref(&md->lod_ost_descs);
 847
 848                 rc = validate_lod_and_idx(md, idx);
 849                 if (unlikely(rc != 0)) {
 850                         lod_putref(md, &md->lod_ost_descs);
 851                         GOTO(out, rc);
 852                 }
 853
 854                 nd = &OST_TGT(md,idx)->ltd_ost->dd_lu_dev;
 855                 lod_putref(md, &md->lod_ost_descs);
 856
 857                 /* In the function below, .hs_keycmp resolves to
 858                  * u_obj_hop_keycmp() */
 859                 /* coverity[overrun-buffer-val] */
 860                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
 861                 if (IS_ERR(o))
 862                         GOTO(out, rc = PTR_ERR(o));
 863
 864                 n = lu_object_locate(o->lo_header, nd->ld_type);
 865                 LASSERT(n);
 866
 867                 stripe[i] = container_of(n, struct dt_object, do_lu);
 868         }
 869
 870 out:
 871         if (rc != 0) {
 872                 for (i = 0; i < stripe_len; i++)
 873                         if (stripe[i] != NULL)
 874                                 lu_object_put(env, &stripe[i]->do_lu);
 875
 876                 OBD_FREE(stripe, sizeof(stripe[0]) * stripe_len);
 877                 lo->ldo_stripenr = 0;
 878         } else {
 879                 lo->ldo_stripe = stripe;
 880                 lo->ldo_stripes_allocated = stripe_len;
 881         }
 882
 883         RETURN(rc);
 884 }
 885
 886 /**
 887  * Instantiate objects for striping.
 888  *
 889  * Parse striping information in \a buf and instantiate the objects
 890  * representing the stripes.
 891  *
 892  * \param[in] env               execution environment for this thread
 893  * \param[in] lo                LOD object
 894  * \param[in] buf               buffer storing LOV EA to parse
 895  *
 896  * \retval                      0 if parsing and objects creation succeed
 897  * \retval                      negative error number on failure
 898  */
 899 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
 900                        const struct lu_buf *buf)
 901 {
 902         struct lov_mds_md_v1    *lmm;
 903         struct lov_ost_data_v1  *objs;
 904         __u32                    magic;
 905         __u32                    pattern;
 906         int                      rc = 0;
 907         ENTRY;
 908
 909         LASSERT(buf);
 910         LASSERT(buf->lb_buf);
 911         LASSERT(buf->lb_len);
 912
 913         lmm = (struct lov_mds_md_v1 *) buf->lb_buf;
 914         magic = le32_to_cpu(lmm->lmm_magic);
 915         pattern = le32_to_cpu(lmm->lmm_pattern);
 916
 917         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3)
 918                 GOTO(out, rc = -EINVAL);
 919         if (lov_pattern(pattern) != LOV_PATTERN_RAID0)
 920                 GOTO(out, rc = -EINVAL);
 921
 922         lo->ldo_pattern = pattern;
 923         lo->ldo_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 924         lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 925         lo->ldo_stripenr = le16_to_cpu(lmm->lmm_stripe_count);
 926         /* released file stripenr fixup. */
 927         if (pattern & LOV_PATTERN_F_RELEASED)
 928                 lo->ldo_stripenr = 0;
 929
 930         LASSERT(buf->lb_len >= lov_mds_md_size(lo->ldo_stripenr, magic));
 931
 932         if (magic == LOV_MAGIC_V3) {
 933                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *) lmm;
 934                 objs = &v3->lmm_objects[0];
 935                 lod_object_set_pool(lo, v3->lmm_pool_name);
 936         } else {
 937                 objs = &lmm->lmm_objects[0];
 938         }
 939
 940         if (lo->ldo_stripenr > 0)
 941                 rc = lod_initialize_objects(env, lo, objs);
 942
 943 out:
 944         RETURN(rc);
 945 }
 946
 947 /**
 948  * Initialize the object representing the stripes.
 949  *
 950  * Unless the stripes are initialized already, fetch LOV (for regular
 951  * objects) or LMV (for directory objects) EA and call lod_parse_striping()
 952  * to instantiate the objects representing the stripes.
 953  *
 954  * \param[in] env               execution environment for this thread
 955  * \param[in,out] lo            LOD object
 956  *
 957  * \retval                      0 if parsing and object creation succeed
 958  * \retval                      negative error number on failure
 959  */
 960 int lod_load_striping_locked(const struct lu_env *env, struct lod_object *lo)
 961 {
 962         struct lod_thread_info  *info = lod_env_info(env);
 963         struct lu_buf           *buf  = &info->lti_buf;
 964         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 965         int                      rc = 0;
 966         ENTRY;
 967
 968         /* already initialized? */
 969         if (lo->ldo_stripe != NULL)
 970                 GOTO(out, rc = 0);
 971
 972         if (!dt_object_exists(next))
 973                 GOTO(out, rc = 0);
 974
 975         /* Do not load stripe for slaves of striped dir */
 976         if (lo->ldo_dir_slave_stripe)
 977                 GOTO(out, rc = 0);
 978
 979         if (S_ISREG(lu_object_attr(lod2lu_obj(lo)))) {
 980                 rc = lod_get_lov_ea(env, lo);
 981                 if (rc <= 0)
 982                         GOTO(out, rc);
 983                 /*
 984                  * there is LOV EA (striping information) in this object
 985                  * let's parse it and create in-core objects for the stripes
 986                  */
 987                 buf->lb_buf = info->lti_ea_store;
 988                 buf->lb_len = info->lti_ea_store_size;
 989                 rc = lod_parse_striping(env, lo, buf);
 990         } else if (S_ISDIR(lu_object_attr(lod2lu_obj(lo)))) {
 991                 rc = lod_get_lmv_ea(env, lo);
 992                 if (rc < (typeof(rc))sizeof(struct lmv_mds_md_v1))
 993                         GOTO(out, rc = rc > 0 ? -EINVAL : rc);
 994
 995                 buf->lb_buf = info->lti_ea_store;
 996                 buf->lb_len = info->lti_ea_store_size;
 997                 if (rc == sizeof(struct lmv_mds_md_v1)) {
 998                         rc = lod_load_lmv_shards(env, lo, buf, true);
 999                         if (buf->lb_buf != info->lti_ea_store) {
1000                                 OBD_FREE_LARGE(info->lti_ea_store,
1001                                                info->lti_ea_store_size);
1002                                 info->lti_ea_store = buf->lb_buf;
1003                                 info->lti_ea_store_size = buf->lb_len;
1004                         }
1005
1006                         if (rc < 0)
1007                                 GOTO(out, rc);
1008                 }
1009
1010                 /*
1011                  * there is LOV EA (striping information) in this object
1012                  * let's parse it and create in-core objects for the stripes
1013                  */
1014                 rc = lod_parse_dir_striping(env, lo, buf);
1015         }
1016
1017         if (rc == 0)
1018                 lo->ldo_striping_cached = 1;
1019 out:
1020         RETURN(rc);
1021 }
1022
1023 /**
1024  * A generic function to initialize the stripe objects.
1025  *
1026  * A protected version of lod_load_striping_locked() - load the striping
1027  * information from storage, parse that and instantiate LU objects to
1028  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1029  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1030  * return an array of references to the newly instantiated objects.
1031  *
1032  * \param[in] env               execution environment for this thread
1033  * \param[in,out] lo            LOD object, where striping is stored and
1034  *                              which gets an array of references
1035  *
1036  * \retval                      0 if parsing and object creation succeed
1037  * \retval                      negative error number on failure
1038  **/
1039 int lod_load_striping(const struct lu_env *env, struct lod_object *lo)
1040 {
1041         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
1042         int                     rc = 0;
1043
1044         /* currently this code is supposed to be called from declaration
1045          * phase only, thus the object is not expected to be locked by caller */
1046         dt_write_lock(env, next, 0);
1047         rc = lod_load_striping_locked(env, lo);
1048         dt_write_unlock(env, next);
1049         return rc;
1050 }
1051
1052 /**
1053  * Verify striping.
1054  *
1055  * Check the validity of all fields including the magic, stripe size,
1056  * stripe count, stripe offset and that the pool is present.  Also check
1057  * that each target index points to an existing target. The additional
1058  * \a is_from_disk turns additional checks. In some cases zero fields
1059  * are allowed (like pattern=0).
1060  *
1061  * \param[in] d                 LOD device
1062  * \param[in] buf               buffer with LOV EA to verify
1063  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1064  *                              1 - from disk, do not allow
1065  *
1066  * \retval                      0 if the striping is valid
1067  * \retval                      -EINVAL if striping is invalid
1068  */
1069 int lod_verify_striping(struct lod_device *d, const struct lu_buf *buf,
1070                         bool is_from_disk)
1071 {
1072         struct lov_user_md_v1   *lum;
1073         struct lov_user_md_v3   *lum3;
1074         struct pool_desc        *pool = NULL;
1075         __u32                    magic;
1076         __u32                    stripe_size;
1077         __u16                    stripe_count;
1078         __u16                    stripe_offset;
1079         size_t                   lum_size;
1080         int                      rc = 0;
1081         ENTRY;
1082
1083         lum = buf->lb_buf;
1084
1085         LASSERT(sizeof(*lum) < sizeof(*lum3));
1086
1087         if (buf->lb_len < sizeof(*lum)) {
1088                 CDEBUG(D_IOCTL, "buf len %zu too small for lov_user_md\n",
1089                        buf->lb_len);
1090                 GOTO(out, rc = -EINVAL);
1091         }
1092
1093         magic = le32_to_cpu(lum->lmm_magic);
1094         if (magic != LOV_USER_MAGIC_V1 &&
1095             magic != LOV_USER_MAGIC_V3 &&
1096             magic != LOV_MAGIC_V1_DEF &&
1097             magic != LOV_MAGIC_V3_DEF) {
1098                 CDEBUG(D_IOCTL, "bad userland LOV MAGIC: %#x\n", magic);
1099                 GOTO(out, rc = -EINVAL);
1100         }
1101
1102         /* the user uses "0" for default stripe pattern normally. */
1103         if (!is_from_disk && lum->lmm_pattern == 0)
1104                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1105
1106         if (le32_to_cpu(lum->lmm_pattern) != LOV_PATTERN_RAID0) {
1107                 CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n",
1108                        le32_to_cpu(lum->lmm_pattern));
1109                 GOTO(out, rc = -EINVAL);
1110         }
1111
1112         /* 64kB is the largest common page size we see (ia64), and matches the
1113          * check in lfs */
1114         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1115         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1116                 CDEBUG(D_IOCTL, "stripe size %u not a multiple of %u\n",
1117                        stripe_size, LOV_MIN_STRIPE_SIZE);
1118                 GOTO(out, rc = -EINVAL);
1119         }
1120
1121         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1122         if (stripe_offset != LOV_OFFSET_DEFAULT) {
1123                 /* if offset is not within valid range [0, osts_size) */
1124                 if (stripe_offset >= d->lod_osts_size) {
1125                         CDEBUG(D_IOCTL, "stripe offset %u >= bitmap size %u\n",
1126                                stripe_offset, d->lod_osts_size);
1127                         GOTO(out, rc = -EINVAL);
1128                 }
1129
1130                 /* if lmm_stripe_offset is *not* in bitmap */
1131                 if (!cfs_bitmap_check(d->lod_ost_bitmap, stripe_offset)) {
1132                         CDEBUG(D_IOCTL, "stripe offset %u not in bitmap\n",
1133                                stripe_offset);
1134                         GOTO(out, rc = -EINVAL);
1135                 }
1136         }
1137
1138         if (magic == LOV_USER_MAGIC_V1 || magic == LOV_MAGIC_V1_DEF)
1139                 lum_size = offsetof(struct lov_user_md_v1,
1140                                     lmm_objects[0]);
1141         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_MAGIC_V3_DEF)
1142                 lum_size = offsetof(struct lov_user_md_v3,
1143                                     lmm_objects[0]);
1144         else
1145                 GOTO(out, rc = -EINVAL);
1146
1147         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1148         if (buf->lb_len != lum_size) {
1149                 CDEBUG(D_IOCTL, "invalid buf len %zu for lov_user_md with "
1150                        "magic %#x and stripe_count %u\n",
1151                        buf->lb_len, magic, stripe_count);
1152                 GOTO(out, rc = -EINVAL);
1153         }
1154
1155         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_MAGIC_V3_DEF))
1156                 goto out;
1157
1158         lum3 = buf->lb_buf;
1159         if (buf->lb_len < sizeof(*lum3)) {
1160                 CDEBUG(D_IOCTL, "buf len %zu too small for lov_user_md_v3\n",
1161                        buf->lb_len);
1162                 GOTO(out, rc = -EINVAL);
1163         }
1164
1165         /* In the function below, .hs_keycmp resolves to
1166          * pool_hashkey_keycmp() */
1167         /* coverity[overrun-buffer-val] */
1168         pool = lod_find_pool(d, lum3->lmm_pool_name);
1169         if (pool == NULL)
1170                 goto out;
1171
1172         if (stripe_offset != LOV_OFFSET_DEFAULT) {
1173                 rc = lod_check_index_in_pool(stripe_offset, pool);
1174                 if (rc < 0)
1175                         GOTO(out, rc = -EINVAL);
1176         }
1177
1178         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1179                 CDEBUG(D_IOCTL,
1180                        "stripe count %u > # OSTs %u in the pool\n",
1181                        stripe_count, pool_tgt_count(pool));
1182                 GOTO(out, rc = -EINVAL);
1183         }
1184
1185 out:
1186         if (pool != NULL)
1187                 lod_pool_putref(pool);
1188
1189         RETURN(rc);
1190 }
1191
1192 void lod_fix_desc_stripe_size(__u64 *val)
1193 {
1194         if (*val < LOV_MIN_STRIPE_SIZE) {
1195                 if (*val != 0)
1196                         LCONSOLE_INFO("Increasing default stripe size to "
1197                                       "minimum value %u\n",
1198                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
1199                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
1200         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
1201                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
1202                 LCONSOLE_WARN("Changing default stripe size to "LPU64" (a "
1203                               "multiple of %u)\n",
1204                               *val, LOV_MIN_STRIPE_SIZE);
1205         }
1206 }
1207
1208 void lod_fix_desc_stripe_count(__u32 *val)
1209 {
1210         if (*val == 0)
1211                 *val = 1;
1212 }
1213
1214 void lod_fix_desc_pattern(__u32 *val)
1215 {
1216         /* from lov_setstripe */
1217         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
1218                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
1219                 *val = 0;
1220         }
1221 }
1222
1223 void lod_fix_desc_qos_maxage(__u32 *val)
1224 {
1225         /* fix qos_maxage */
1226         if (*val == 0)
1227                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
1228 }
1229
1230 /**
1231  * Used to fix insane default striping.
1232  *
1233  * \param[in] desc      striping description
1234  */
1235 void lod_fix_desc(struct lov_desc *desc)
1236 {
1237         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
1238         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
1239         lod_fix_desc_pattern(&desc->ld_pattern);
1240         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
1241 }
1242
1243 /**
1244  * Initialize the structures used to store pools and default striping.
1245  *
1246  * \param[in] lod       LOD device
1247  * \param[in] lcfg      configuration structure storing default striping.
1248  *
1249  * \retval              0 if initialization succeeds
1250  * \retval              negative error number on failure
1251  */
1252 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
1253 {
1254         struct obd_device          *obd;
1255         struct lov_desc            *desc;
1256         int                         rc;
1257         ENTRY;
1258
1259         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1260         LASSERT(obd != NULL);
1261         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
1262
1263         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1264                 CERROR("LOD setup requires a descriptor\n");
1265                 RETURN(-EINVAL);
1266         }
1267
1268         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
1269
1270         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1271                 CERROR("descriptor size wrong: %d > %d\n",
1272                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1273                 RETURN(-EINVAL);
1274         }
1275
1276         if (desc->ld_magic != LOV_DESC_MAGIC) {
1277                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
1278                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
1279                                obd->obd_name, desc);
1280                         lustre_swab_lov_desc(desc);
1281                 } else {
1282                         CERROR("%s: Bad lov desc magic: %#x\n",
1283                                obd->obd_name, desc->ld_magic);
1284                         RETURN(-EINVAL);
1285                 }
1286         }
1287
1288         lod_fix_desc(desc);
1289
1290         desc->ld_active_tgt_count = 0;
1291         lod->lod_desc = *desc;
1292
1293         lod->lod_sp_me = LUSTRE_SP_CLI;
1294
1295         /* Set up allocation policy (QoS and RR) */
1296         INIT_LIST_HEAD(&lod->lod_qos.lq_oss_list);
1297         init_rwsem(&lod->lod_qos.lq_rw_sem);
1298         lod->lod_qos.lq_dirty = 1;
1299         lod->lod_qos.lq_rr.lqr_dirty = 1;
1300         lod->lod_qos.lq_reset = 1;
1301         /* Default priority is toward free space balance */
1302         lod->lod_qos.lq_prio_free = 232;
1303         /* Default threshold for rr (roughly 17%) */
1304         lod->lod_qos.lq_threshold_rr = 43;
1305
1306         /* Set up OST pool environment */
1307         lod->lod_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
1308                                                    HASH_POOLS_MAX_BITS,
1309                                                    HASH_POOLS_BKT_BITS, 0,
1310                                                    CFS_HASH_MIN_THETA,
1311                                                    CFS_HASH_MAX_THETA,
1312                                                    &pool_hash_operations,
1313                                                    CFS_HASH_DEFAULT);
1314         if (lod->lod_pools_hash_body == NULL)
1315                 RETURN(-ENOMEM);
1316
1317         INIT_LIST_HEAD(&lod->lod_pool_list);
1318         lod->lod_pool_count = 0;
1319         rc = lod_ost_pool_init(&lod->lod_pool_info, 0);
1320         if (rc)
1321                 GOTO(out_hash, rc);
1322         lod_qos_rr_init(&lod->lod_qos.lq_rr);
1323         rc = lod_ost_pool_init(&lod->lod_qos.lq_rr.lqr_pool, 0);
1324         if (rc)
1325                 GOTO(out_pool_info, rc);
1326
1327         RETURN(0);
1328
1329 out_pool_info:
1330         lod_ost_pool_free(&lod->lod_pool_info);
1331 out_hash:
1332         cfs_hash_putref(lod->lod_pools_hash_body);
1333
1334         return rc;
1335 }
1336
1337 /**
1338  * Release the structures describing the pools.
1339  *
1340  * \param[in] lod       LOD device from which we release the structures
1341  *
1342  * \retval              0 always
1343  */
1344 int lod_pools_fini(struct lod_device *lod)
1345 {
1346         struct obd_device   *obd = lod2obd(lod);
1347         struct pool_desc    *pool, *tmp;
1348         ENTRY;
1349
1350         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
1351                 /* free pool structs */
1352                 CDEBUG(D_INFO, "delete pool %p\n", pool);
1353                 /* In the function below, .hs_keycmp resolves to
1354                  * pool_hashkey_keycmp() */
1355                 /* coverity[overrun-buffer-val] */
1356                 lod_pool_del(obd, pool->pool_name);
1357         }
1358
1359         cfs_hash_putref(lod->lod_pools_hash_body);
1360         lod_ost_pool_free(&(lod->lod_qos.lq_rr.lqr_pool));
1361         lod_ost_pool_free(&lod->lod_pool_info);
1362
1363         RETURN(0);
1364 }