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_REQPORTAL |
 257                                            OBD_CONNECT_SKIP_ORPHAN |
 258                                            OBD_CONNECT_FID |
 259                                            OBD_CONNECT_LVB_TYPE |
 260                                            OBD_CONNECT_VERSION |
 261                                            OBD_CONNECT_PINGLESS |
 262                                            OBD_CONNECT_LFSCK;
 263
 264                 data->ocd_group = tgt_index;
 265                 ltd = &lod->lod_ost_descs;
 266         } else {
 267                 struct obd_import *imp = obd->u.cli.cl_import;
 268
 269                 for_ost = false;
 270                 data->ocd_ibits_known = MDS_INODELOCK_UPDATE;
 271                 data->ocd_connect_flags |= OBD_CONNECT_ACL |
 272                                            OBD_CONNECT_IBITS |
 273                                            OBD_CONNECT_MDS_MDS |
 274                                            OBD_CONNECT_FID |
 275                                            OBD_CONNECT_AT |
 276                                            OBD_CONNECT_FULL20 |
 277                                            OBD_CONNECT_LFSCK;
 278                 spin_lock(&imp->imp_lock);
 279                 imp->imp_server_timeout = 1;
 280                 spin_unlock(&imp->imp_lock);
 281                 imp->imp_client->cli_request_portal = OUT_PORTAL;
 282                 CDEBUG(D_OTHER, "%s: Set 'mds' portal and timeout\n",
 283                       obd->obd_name);
 284                 ltd = &lod->lod_mdt_descs;
 285         }
 286
 287         rc = obd_connect(env, &exp, obd, &obd->obd_uuid, data, NULL);
 288         OBD_FREE_PTR(data);
 289         if (rc) {
 290                 CERROR("%s: cannot connect to next dev %s (%d)\n",
 291                        obd->obd_name, osp, rc);
 292                 GOTO(out_free, rc);
 293         }
 294
 295         LASSERT(obd->obd_lu_dev);
 296         LASSERT(obd->obd_lu_dev->ld_site == lod->lod_dt_dev.dd_lu_dev.ld_site);
 297
 298         ldev = obd->obd_lu_dev;
 299         d = lu2dt_dev(ldev);
 300
 301         /* Allocate ost descriptor and fill it */
 302         OBD_ALLOC_PTR(tgt_desc);
 303         if (!tgt_desc)
 304                 GOTO(out_conn, rc = -ENOMEM);
 305
 306         tgt_desc->ltd_tgt    = d;
 307         tgt_desc->ltd_exp    = exp;
 308         tgt_desc->ltd_uuid   = obd->u.cli.cl_target_uuid;
 309         tgt_desc->ltd_gen    = gen;
 310         tgt_desc->ltd_index  = index;
 311         tgt_desc->ltd_active = active;
 312
 313         lod_getref(ltd);
 314         if (index >= ltd->ltd_tgts_size) {
 315                 /* we have to increase the size of the lod_osts array */
 316                 __u32  newsize;
 317
 318                 newsize = max(ltd->ltd_tgts_size, (__u32)2);
 319                 while (newsize < index + 1)
 320                         newsize = newsize << 1;
 321
 322                 /* lod_bitmap_resize() needs lod_rw_sem
 323                  * which we hold with th reference */
 324                 lod_putref(lod, ltd);
 325
 326                 rc = ltd_bitmap_resize(ltd, newsize);
 327                 if (rc)
 328                         GOTO(out_desc, rc);
 329
 330                 lod_getref(ltd);
 331         }
 332
 333         mutex_lock(&ltd->ltd_mutex);
 334         if (cfs_bitmap_check(ltd->ltd_tgt_bitmap, index)) {
 335                 CERROR("%s: device %d is registered already\n", obd->obd_name,
 336                        index);
 337                 GOTO(out_mutex, rc = -EEXIST);
 338         }
 339
 340         if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 341                 OBD_ALLOC_PTR(ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK]);
 342                 if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 343                         CERROR("can't allocate index to add %s\n",
 344                                obd->obd_name);
 345                         GOTO(out_mutex, rc = -ENOMEM);
 346                 }
 347         }
 348
 349         if (for_ost) {
 350                 /* pool and qos are not supported for MDS stack yet */
 351                 rc = lod_ost_pool_add(&lod->lod_pool_info, index,
 352                                       lod->lod_osts_size);
 353                 if (rc) {
 354                         CERROR("%s: can't set up pool, failed with %d\n",
 355                                obd->obd_name, rc);
 356                         GOTO(out_mutex, rc);
 357                 }
 358
 359                 rc = qos_add_tgt(lod, tgt_desc);
 360                 if (rc) {
 361                         CERROR("%s: qos_add_tgt failed with %d\n",
 362                                 obd->obd_name, rc);
 363                         GOTO(out_pool, rc);
 364                 }
 365
 366                 /* The new OST is now a full citizen */
 367                 if (index >= lod->lod_desc.ld_tgt_count)
 368                         lod->lod_desc.ld_tgt_count = index + 1;
 369                 if (active)
 370                         lod->lod_desc.ld_active_tgt_count++;
 371         }
 372
 373         LTD_TGT(ltd, index) = tgt_desc;
 374         cfs_bitmap_set(ltd->ltd_tgt_bitmap, index);
 375         ltd->ltd_tgtnr++;
 376         mutex_unlock(&ltd->ltd_mutex);
 377         lod_putref(lod, ltd);
 378         if (lod->lod_recovery_completed)
 379                 ldev->ld_ops->ldo_recovery_complete(env, ldev);
 380
 381         if (!for_ost && lod->lod_initialized) {
 382                 rc = lod_sub_init_llog(env, lod, tgt_desc->ltd_tgt);
 383                 if (rc != 0) {
 384                         CERROR("%s: cannot start llog on %s:rc = %d\n",
 385                                lod2obd(lod)->obd_name, osp, rc);
 386                         GOTO(out_pool, rc);
 387                 }
 388         }
 389
 390         rc = lfsck_add_target(env, lod->lod_child, d, exp, index, for_ost);
 391         if (rc != 0) {
 392                 CERROR("Fail to add LFSCK target: name = %s, type = %s, "
 393                        "index = %u, rc = %d\n", osp, type, index, rc);
 394                 GOTO(out_fini_llog, rc);
 395         }
 396         RETURN(rc);
 397 out_fini_llog:
 398         lod_sub_fini_llog(env, tgt_desc->ltd_tgt,
 399                           tgt_desc->ltd_recovery_thread);
 400 out_pool:
 401         lod_ost_pool_remove(&lod->lod_pool_info, index);
 402 out_mutex:
 403         mutex_unlock(&ltd->ltd_mutex);
 404         lod_putref(lod, ltd);
 405 out_desc:
 406         OBD_FREE_PTR(tgt_desc);
 407 out_conn:
 408         obd_disconnect(exp);
 409 out_free:
 410         return rc;
 411 }
 412
 413 /**
 414  * Schedule target removal from the target table.
 415  *
 416  * Mark the device as dead. The device is not removed here because it may
 417  * still be in use. The device will be removed in lod_putref() when the
 418  * last reference is released.
 419  *
 420  * \param[in] env               execution environment for this thread
 421  * \param[in] lod               LOD device the target table belongs to
 422  * \param[in] ltd               target table
 423  * \param[in] idx               index of the target
 424  * \param[in] for_ost           type of the target: 0 - MDT, 1 - OST
 425  */
 426 static void __lod_del_device(const struct lu_env *env, struct lod_device *lod,
 427                              struct lod_tgt_descs *ltd, unsigned idx,
 428                              bool for_ost)
 429 {
 430         LASSERT(LTD_TGT(ltd, idx));
 431
 432         lfsck_del_target(env, lod->lod_child, LTD_TGT(ltd, idx)->ltd_tgt,
 433                          idx, for_ost);
 434
 435         if (!for_ost && LTD_TGT(ltd, idx)->ltd_recovery_thread != NULL) {
 436                 struct ptlrpc_thread *thread;
 437
 438                 thread = LTD_TGT(ltd, idx)->ltd_recovery_thread;
 439                 OBD_FREE_PTR(thread);
 440         }
 441
 442         if (LTD_TGT(ltd, idx)->ltd_reap == 0) {
 443                 LTD_TGT(ltd, idx)->ltd_reap = 1;
 444                 ltd->ltd_death_row++;
 445         }
 446 }
 447
 448 /**
 449  * Schedule removal of all the targets from the given target table.
 450  *
 451  * See more details in the description for __lod_del_device()
 452  *
 453  * \param[in] env               execution environment for this thread
 454  * \param[in] lod               LOD device the target table belongs to
 455  * \param[in] ltd               target table
 456  * \param[in] for_ost           type of the target: MDT or OST
 457  *
 458  * \retval                      0 always
 459  */
 460 int lod_fini_tgt(const struct lu_env *env, struct lod_device *lod,
 461                  struct lod_tgt_descs *ltd, bool for_ost)
 462 {
 463         unsigned int idx;
 464
 465         if (ltd->ltd_tgts_size <= 0)
 466                 return 0;
 467         lod_getref(ltd);
 468         mutex_lock(&ltd->ltd_mutex);
 469         cfs_foreach_bit(ltd->ltd_tgt_bitmap, idx)
 470                 __lod_del_device(env, lod, ltd, idx, for_ost);
 471         mutex_unlock(&ltd->ltd_mutex);
 472         lod_putref(lod, ltd);
 473         CFS_FREE_BITMAP(ltd->ltd_tgt_bitmap);
 474         for (idx = 0; idx < TGT_PTRS; idx++) {
 475                 if (ltd->ltd_tgt_idx[idx])
 476                         OBD_FREE_PTR(ltd->ltd_tgt_idx[idx]);
 477         }
 478         ltd->ltd_tgts_size = 0;
 479         return 0;
 480 }
 481
 482 /**
 483  * Remove device by name.
 484  *
 485  * Remove a device identified by \a osp from the target table. Given
 486  * the device can be in use, the real deletion happens in lod_putref().
 487  *
 488  * \param[in] env               execution environment for this thread
 489  * \param[in] lod               LOD device to be connected to the new OSP
 490  * \param[in] ltd               target table
 491  * \param[in] osp               name of OSP device to be removed
 492  * \param[in] idx               index of the target
 493  * \param[in] gen               generation number, not used currently
 494  * \param[in] for_ost           type of the target: 0 - MDT, 1 - OST
 495  *
 496  * \retval                      0 if the device was scheduled for removal
 497  * \retval                      -EINVAL if no device was found
 498  */
 499 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
 500                    struct lod_tgt_descs *ltd, char *osp, unsigned idx,
 501                    unsigned gen, bool for_ost)
 502 {
 503         struct obd_device *obd;
 504         int                rc = 0;
 505         struct obd_uuid    uuid;
 506         ENTRY;
 507
 508         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
 509
 510         obd_str2uuid(&uuid, osp);
 511
 512         obd = class_find_client_obd(&uuid, LUSTRE_OSP_NAME,
 513                                    &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 514         if (obd == NULL) {
 515                 CERROR("can't find %s device\n", osp);
 516                 RETURN(-EINVAL);
 517         }
 518
 519         if (gen <= 0) {
 520                 CERROR("%s: request to remove OBD %s with invalid generation %d"
 521                        "\n", obd->obd_name, osp, gen);
 522                 RETURN(-EINVAL);
 523         }
 524
 525         obd_str2uuid(&uuid,  osp);
 526
 527         lod_getref(ltd);
 528         mutex_lock(&ltd->ltd_mutex);
 529         /* check that the index is allocated in the bitmap */
 530         if (!cfs_bitmap_check(ltd->ltd_tgt_bitmap, idx) ||
 531             !LTD_TGT(ltd, idx)) {
 532                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
 533                 GOTO(out, rc = -EINVAL);
 534         }
 535
 536         /* check that the UUID matches */
 537         if (!obd_uuid_equals(&uuid, &LTD_TGT(ltd, idx)->ltd_uuid)) {
 538                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
 539                        obd->obd_name, obd_uuid2str(&LTD_TGT(ltd,idx)->ltd_uuid),
 540                        idx, osp);
 541                 GOTO(out, rc = -EINVAL);
 542         }
 543
 544         __lod_del_device(env, lod, ltd, idx, for_ost);
 545         EXIT;
 546 out:
 547         mutex_unlock(&ltd->ltd_mutex);
 548         lod_putref(lod, ltd);
 549         return(rc);
 550 }
 551
 552 /**
 553  * Resize per-thread storage to hold specified size.
 554  *
 555  * A helper function to resize per-thread temporary storage. This storage
 556  * is used to process LOV/LVM EAs and may be quite large. We do not want to
 557  * allocate/release it every time, so instead we put it into the env and
 558  * reallocate on demand. The memory is released when the correspondent thread
 559  * is finished.
 560  *
 561  * \param[in] info              LOD-specific storage in the environment
 562  * \param[in] size              new size to grow the buffer to
 563
 564  * \retval                      0 on success, -ENOMEM if reallocation failed
 565  */
 566 int lod_ea_store_resize(struct lod_thread_info *info, size_t size)
 567 {
 568         __u32 round = size_roundup_power2(size);
 569
 570         LASSERT(round <=
 571                 lov_mds_md_size(LOV_MAX_STRIPE_COUNT, LOV_MAGIC_V3));
 572         if (info->lti_ea_store) {
 573                 LASSERT(info->lti_ea_store_size);
 574                 LASSERT(info->lti_ea_store_size < round);
 575                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
 576                        info->lti_ea_store_size, round);
 577                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
 578                 info->lti_ea_store = NULL;
 579                 info->lti_ea_store_size = 0;
 580         }
 581
 582         OBD_ALLOC_LARGE(info->lti_ea_store, round);
 583         if (info->lti_ea_store == NULL)
 584                 RETURN(-ENOMEM);
 585         info->lti_ea_store_size = round;
 586         RETURN(0);
 587 }
 588
 589 /**
 590  * Make LOV EA for striped object.
 591  *
 592  * Generate striping information and store it in the LOV EA of the given
 593  * object. The caller must ensure nobody else is calling the function
 594  * against the object concurrently. The transaction must be started.
 595  * FLDB service must be running as well; it's used to map FID to the target,
 596  * which is stored in LOV EA.
 597  *
 598  * \param[in] env               execution environment for this thread
 599  * \param[in] lo                LOD object
 600  * \param[in] th                transaction handle
 601  *
 602  * \retval                      0 if LOV EA is stored successfully
 603  * \retval                      negative error number on failure
 604  */
 605 int lod_generate_and_set_lovea(const struct lu_env *env,
 606                                struct lod_object *lo, struct thandle *th)
 607 {
 608         struct lod_thread_info  *info = lod_env_info(env);
 609         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 610         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
 611         struct lov_mds_md_v1    *lmm;
 612         struct lov_ost_data_v1  *objs;
 613         __u32                    magic;
 614         int                      i, rc;
 615         size_t                   lmm_size;
 616         ENTRY;
 617
 618         LASSERT(lo);
 619
 620         magic = lo->ldo_pool != NULL ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
 621         lmm_size = lov_mds_md_size(lo->ldo_stripenr, magic);
 622         if (info->lti_ea_store_size < lmm_size) {
 623                 rc = lod_ea_store_resize(info, lmm_size);
 624                 if (rc)
 625                         RETURN(rc);
 626         }
 627
 628         if (lo->ldo_pattern == 0) /* default striping */
 629                 lo->ldo_pattern = LOV_PATTERN_RAID0;
 630
 631         lmm = info->lti_ea_store;
 632
 633         lmm->lmm_magic = cpu_to_le32(magic);
 634         lmm->lmm_pattern = cpu_to_le32(lo->ldo_pattern);
 635         fid_to_lmm_oi(fid, &lmm->lmm_oi);
 636         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
 637                 lmm->lmm_oi.oi.oi_id++;
 638         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
 639         lmm->lmm_stripe_size = cpu_to_le32(lo->ldo_stripe_size);
 640         lmm->lmm_stripe_count = cpu_to_le16(lo->ldo_stripenr);
 641         if (lo->ldo_pattern & LOV_PATTERN_F_RELEASED)
 642                 lmm->lmm_stripe_count = cpu_to_le16(lo->ldo_released_stripenr);
 643         lmm->lmm_layout_gen = 0;
 644         if (magic == LOV_MAGIC_V1) {
 645                 objs = &lmm->lmm_objects[0];
 646         } else {
 647                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *) lmm;
 648                 size_t cplen = strlcpy(v3->lmm_pool_name, lo->ldo_pool,
 649                                 sizeof(v3->lmm_pool_name));
 650                 if (cplen >= sizeof(v3->lmm_pool_name))
 651                         RETURN(-E2BIG);
 652                 objs = &v3->lmm_objects[0];
 653         }
 654
 655         for (i = 0; i < lo->ldo_stripenr; i++) {
 656                 struct lu_fid           *fid    = &info->lti_fid;
 657                 struct lod_device       *lod;
 658                 __u32                   index;
 659                 int                     type    = LU_SEQ_RANGE_OST;
 660
 661                 lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 662                 LASSERT(lo->ldo_stripe[i]);
 663
 664                 *fid = *lu_object_fid(&lo->ldo_stripe[i]->do_lu);
 665                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF)) {
 666                         if (cfs_fail_val == 0)
 667                                 cfs_fail_val = fid->f_oid;
 668                         else
 669                                 fid->f_oid = cfs_fail_val;
 670                 }
 671
 672                 rc = fid_to_ostid(fid, &info->lti_ostid);
 673                 LASSERT(rc == 0);
 674
 675                 ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 676                 objs[i].l_ost_gen    = cpu_to_le32(0);
 677                 rc = lod_fld_lookup(env, lod, fid, &index, &type);
 678                 if (rc < 0) {
 679                         CERROR("%s: Can not locate "DFID": rc = %d\n",
 680                                lod2obd(lod)->obd_name, PFID(fid), rc);
 681                         lod_object_free_striping(env, lo);
 682                         RETURN(rc);
 683                 }
 684                 objs[i].l_ost_idx = cpu_to_le32(index);
 685         }
 686
 687         info->lti_buf.lb_buf = lmm;
 688         info->lti_buf.lb_len = lmm_size;
 689         rc = lod_sub_object_xattr_set(env, next, &info->lti_buf, XATTR_NAME_LOV,
 690                                       0, th);
 691         if (rc < 0) {
 692                 lod_object_free_striping(env, lo);
 693                 RETURN(rc);
 694         }
 695
 696         RETURN(rc);
 697 }
 698
 699 /**
 700  * Get LOV EA.
 701  *
 702  * Fill lti_ea_store buffer in the environment with a value for the given
 703  * EA. The buffer is reallocated if the value doesn't fit.
 704  *
 705  * \param[in,out] env           execution environment for this thread
 706  *                              .lti_ea_store buffer is filled with EA's value
 707  * \param[in] lo                LOD object
 708  * \param[in] name              name of the EA
 709  *
 710  * \retval                      0 if EA is fetched successfully
 711  * \retval                      negative error number on failure
 712  */
 713 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
 714                const char *name)
 715 {
 716         struct lod_thread_info  *info = lod_env_info(env);
 717         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 718         int                     rc;
 719         ENTRY;
 720
 721         LASSERT(info);
 722
 723         if (unlikely(info->lti_ea_store == NULL)) {
 724                 /* just to enter in allocation block below */
 725                 rc = -ERANGE;
 726         } else {
 727 repeat:
 728                 info->lti_buf.lb_buf = info->lti_ea_store;
 729                 info->lti_buf.lb_len = info->lti_ea_store_size;
 730                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
 731         }
 732
 733         /* if object is not striped or inaccessible */
 734         if (rc == -ENODATA || rc == -ENOENT)
 735                 RETURN(0);
 736
 737         if (rc == -ERANGE) {
 738                 /* EA doesn't fit, reallocate new buffer */
 739                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
 740                 if (rc == -ENODATA || rc == -ENOENT)
 741                         RETURN(0);
 742                 else if (rc < 0)
 743                         RETURN(rc);
 744
 745                 LASSERT(rc > 0);
 746                 rc = lod_ea_store_resize(info, rc);
 747                 if (rc)
 748                         RETURN(rc);
 749                 goto repeat;
 750         }
 751
 752         RETURN(rc);
 753 }
 754
 755 /**
 756  * Verify the target index is present in the current configuration.
 757  *
 758  * \param[in] md                LOD device where the target table is stored
 759  * \param[in] idx               target's index
 760  *
 761  * \retval                      0 if the index is present
 762  * \retval                      -EINVAL if not
 763  */
 764 static int validate_lod_and_idx(struct lod_device *md, __u32 idx)
 765 {
 766         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
 767                      !cfs_bitmap_check(md->lod_ost_bitmap, idx))) {
 768                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
 769                        md->lod_ost_descs.ltd_tgts_size);
 770                 return -EINVAL;
 771         }
 772
 773         if (unlikely(OST_TGT(md, idx) == NULL)) {
 774                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
 775                        lod2obd(md)->obd_name, idx);
 776                 return -EINVAL;
 777         }
 778
 779         if (unlikely(OST_TGT(md, idx)->ltd_ost == NULL)) {
 780                 CERROR("%s: invalid lod device, for idx: %d\n",
 781                        lod2obd(md)->obd_name , idx);
 782                 return -EINVAL;
 783         }
 784
 785         return 0;
 786 }
 787
 788 /**
 789  * Instantiate objects for stripes.
 790  *
 791  * Allocate and initialize LU-objects representing the stripes. The number
 792  * of the stripes (ldo_stripenr) must be initialized already. The caller
 793  * must ensure nobody else is calling the function on the object at the same
 794  * time. FLDB service must be running to be able to map a FID to the targets
 795  * and find appropriate device representing that target.
 796  *
 797  * \param[in] env               execution environment for this thread
 798  * \param[in,out] lo            LOD object
 799  * \param[in] objs              an array of IDs to creates the objects from
 800  *
 801  * \retval                      0 if the objects are instantiated successfully
 802  * \retval                      negative error number on failure
 803  */
 804 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
 805                            struct lov_ost_data_v1 *objs)
 806 {
 807         struct lod_thread_info  *info = lod_env_info(env);
 808         struct lod_device       *md;
 809         struct lu_object        *o, *n;
 810         struct lu_device        *nd;
 811         struct dt_object       **stripe;
 812         int                      stripe_len;
 813         int                      i, rc = 0;
 814         __u32                   idx;
 815         ENTRY;
 816
 817         LASSERT(lo != NULL);
 818         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 819         LASSERT(lo->ldo_stripe == NULL);
 820         LASSERT(lo->ldo_stripenr > 0);
 821         LASSERT(lo->ldo_stripe_size > 0);
 822
 823         stripe_len = lo->ldo_stripenr;
 824         OBD_ALLOC(stripe, sizeof(stripe[0]) * stripe_len);
 825         if (stripe == NULL)
 826                 RETURN(-ENOMEM);
 827
 828         for (i = 0; i < lo->ldo_stripenr; i++) {
 829                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
 830                         continue;
 831
 832                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
 833                 idx = le32_to_cpu(objs[i].l_ost_idx);
 834                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
 835                 if (rc != 0)
 836                         GOTO(out, rc);
 837                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
 838                          PFID(&info->lti_fid));
 839                 lod_getref(&md->lod_ost_descs);
 840
 841                 rc = validate_lod_and_idx(md, idx);
 842                 if (unlikely(rc != 0)) {
 843                         lod_putref(md, &md->lod_ost_descs);
 844                         GOTO(out, rc);
 845                 }
 846
 847                 nd = &OST_TGT(md,idx)->ltd_ost->dd_lu_dev;
 848                 lod_putref(md, &md->lod_ost_descs);
 849
 850                 /* In the function below, .hs_keycmp resolves to
 851                  * u_obj_hop_keycmp() */
 852                 /* coverity[overrun-buffer-val] */
 853                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
 854                 if (IS_ERR(o))
 855                         GOTO(out, rc = PTR_ERR(o));
 856
 857                 n = lu_object_locate(o->lo_header, nd->ld_type);
 858                 LASSERT(n);
 859
 860                 stripe[i] = container_of(n, struct dt_object, do_lu);
 861         }
 862
 863 out:
 864         if (rc != 0) {
 865                 for (i = 0; i < stripe_len; i++)
 866                         if (stripe[i] != NULL)
 867                                 lu_object_put(env, &stripe[i]->do_lu);
 868
 869                 OBD_FREE(stripe, sizeof(stripe[0]) * stripe_len);
 870                 lo->ldo_stripenr = 0;
 871         } else {
 872                 lo->ldo_stripe = stripe;
 873                 lo->ldo_stripes_allocated = stripe_len;
 874         }
 875
 876         RETURN(rc);
 877 }
 878
 879 /**
 880  * Instantiate objects for striping.
 881  *
 882  * Parse striping information in \a buf and instantiate the objects
 883  * representing the stripes.
 884  *
 885  * \param[in] env               execution environment for this thread
 886  * \param[in] lo                LOD object
 887  * \param[in] buf               buffer storing LOV EA to parse
 888  *
 889  * \retval                      0 if parsing and objects creation succeed
 890  * \retval                      negative error number on failure
 891  */
 892 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
 893                        const struct lu_buf *buf)
 894 {
 895         struct lov_mds_md_v1    *lmm;
 896         struct lov_ost_data_v1  *objs;
 897         __u32                    magic;
 898         __u32                    pattern;
 899         int                      rc = 0;
 900         ENTRY;
 901
 902         LASSERT(buf);
 903         LASSERT(buf->lb_buf);
 904         LASSERT(buf->lb_len);
 905
 906         lmm = (struct lov_mds_md_v1 *) buf->lb_buf;
 907         magic = le32_to_cpu(lmm->lmm_magic);
 908         pattern = le32_to_cpu(lmm->lmm_pattern);
 909
 910         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3)
 911                 GOTO(out, rc = -EINVAL);
 912         if (lov_pattern(pattern) != LOV_PATTERN_RAID0)
 913                 GOTO(out, rc = -EINVAL);
 914
 915         lo->ldo_pattern = pattern;
 916         lo->ldo_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 917         lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 918         lo->ldo_stripenr = le16_to_cpu(lmm->lmm_stripe_count);
 919         /* released file stripenr fixup. */
 920         if (pattern & LOV_PATTERN_F_RELEASED)
 921                 lo->ldo_stripenr = 0;
 922
 923         LASSERT(buf->lb_len >= lov_mds_md_size(lo->ldo_stripenr, magic));
 924
 925         if (magic == LOV_MAGIC_V3) {
 926                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *) lmm;
 927                 objs = &v3->lmm_objects[0];
 928                 lod_object_set_pool(lo, v3->lmm_pool_name);
 929         } else {
 930                 objs = &lmm->lmm_objects[0];
 931         }
 932
 933         if (lo->ldo_stripenr > 0)
 934                 rc = lod_initialize_objects(env, lo, objs);
 935
 936 out:
 937         RETURN(rc);
 938 }
 939
 940 /**
 941  * Initialize the object representing the stripes.
 942  *
 943  * Unless the stripes are initialized already, fetch LOV (for regular
 944  * objects) or LMV (for directory objects) EA and call lod_parse_striping()
 945  * to instantiate the objects representing the stripes.
 946  *
 947  * \param[in] env               execution environment for this thread
 948  * \param[in,out] lo            LOD object
 949  *
 950  * \retval                      0 if parsing and object creation succeed
 951  * \retval                      negative error number on failure
 952  */
 953 int lod_load_striping_locked(const struct lu_env *env, struct lod_object *lo)
 954 {
 955         struct lod_thread_info  *info = lod_env_info(env);
 956         struct lu_buf           *buf  = &info->lti_buf;
 957         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 958         int                      rc = 0;
 959         ENTRY;
 960
 961         /* already initialized? */
 962         if (lo->ldo_stripe != NULL)
 963                 GOTO(out, rc = 0);
 964
 965         if (!dt_object_exists(next))
 966                 GOTO(out, rc = 0);
 967
 968         /* Do not load stripe for slaves of striped dir */
 969         if (lo->ldo_dir_slave_stripe)
 970                 GOTO(out, rc = 0);
 971
 972         if (S_ISREG(lu_object_attr(lod2lu_obj(lo)))) {
 973                 rc = lod_get_lov_ea(env, lo);
 974                 if (rc <= 0)
 975                         GOTO(out, rc);
 976                 /*
 977                  * there is LOV EA (striping information) in this object
 978                  * let's parse it and create in-core objects for the stripes
 979                  */
 980                 buf->lb_buf = info->lti_ea_store;
 981                 buf->lb_len = info->lti_ea_store_size;
 982                 rc = lod_parse_striping(env, lo, buf);
 983         } else if (S_ISDIR(lu_object_attr(lod2lu_obj(lo)))) {
 984                 rc = lod_get_lmv_ea(env, lo);
 985                 if (rc < (typeof(rc))sizeof(struct lmv_mds_md_v1))
 986                         GOTO(out, rc = rc > 0 ? -EINVAL : rc);
 987
 988                 buf->lb_buf = info->lti_ea_store;
 989                 buf->lb_len = info->lti_ea_store_size;
 990                 if (rc == sizeof(struct lmv_mds_md_v1)) {
 991                         rc = lod_load_lmv_shards(env, lo, buf, true);
 992                         if (buf->lb_buf != info->lti_ea_store) {
 993                                 OBD_FREE_LARGE(info->lti_ea_store,
 994                                                info->lti_ea_store_size);
 995                                 info->lti_ea_store = buf->lb_buf;
 996                                 info->lti_ea_store_size = buf->lb_len;
 997                         }
 998
 999                         if (rc < 0)
1000                                 GOTO(out, rc);
1001                 }
1002
1003                 /*
1004                  * there is LOV EA (striping information) in this object
1005                  * let's parse it and create in-core objects for the stripes
1006                  */
1007                 rc = lod_parse_dir_striping(env, lo, buf);
1008         }
1009
1010         if (rc == 0)
1011                 lo->ldo_striping_cached = 1;
1012 out:
1013         RETURN(rc);
1014 }
1015
1016 /**
1017  * A generic function to initialize the stripe objects.
1018  *
1019  * A protected version of lod_load_striping_locked() - load the striping
1020  * information from storage, parse that and instantiate LU objects to
1021  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1022  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1023  * return an array of references to the newly instantiated objects.
1024  *
1025  * \param[in] env               execution environment for this thread
1026  * \param[in,out] lo            LOD object, where striping is stored and
1027  *                              which gets an array of references
1028  *
1029  * \retval                      0 if parsing and object creation succeed
1030  * \retval                      negative error number on failure
1031  **/
1032 int lod_load_striping(const struct lu_env *env, struct lod_object *lo)
1033 {
1034         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
1035         int                     rc = 0;
1036
1037         /* currently this code is supposed to be called from declaration
1038          * phase only, thus the object is not expected to be locked by caller */
1039         dt_write_lock(env, next, 0);
1040         rc = lod_load_striping_locked(env, lo);
1041         dt_write_unlock(env, next);
1042         return rc;
1043 }
1044
1045 /**
1046  * Verify striping.
1047  *
1048  * Check the validity of all fields including the magic, stripe size,
1049  * stripe count, stripe offset and that the pool is present.  Also check
1050  * that each target index points to an existing target. The additional
1051  * \a is_from_disk turns additional checks. In some cases zero fields
1052  * are allowed (like pattern=0).
1053  *
1054  * \param[in] d                 LOD device
1055  * \param[in] buf               buffer with LOV EA to verify
1056  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1057  *                              1 - from disk, do not allow
1058  *
1059  * \retval                      0 if the striping is valid
1060  * \retval                      -EINVAL if striping is invalid
1061  */
1062 int lod_verify_striping(struct lod_device *d, const struct lu_buf *buf,
1063                         bool is_from_disk)
1064 {
1065         struct lov_user_md_v1   *lum;
1066         struct lov_user_md_v3   *lum3;
1067         struct pool_desc        *pool = NULL;
1068         __u32                    magic;
1069         __u32                    stripe_size;
1070         __u16                    stripe_count;
1071         __u16                    stripe_offset;
1072         size_t                   lum_size;
1073         int                      rc = 0;
1074         ENTRY;
1075
1076         lum = buf->lb_buf;
1077
1078         LASSERT(sizeof(*lum) < sizeof(*lum3));
1079
1080         if (buf->lb_len < sizeof(*lum)) {
1081                 CDEBUG(D_IOCTL, "buf len %zu too small for lov_user_md\n",
1082                        buf->lb_len);
1083                 GOTO(out, rc = -EINVAL);
1084         }
1085
1086         magic = le32_to_cpu(lum->lmm_magic);
1087         if (magic != LOV_USER_MAGIC_V1 &&
1088             magic != LOV_USER_MAGIC_V3 &&
1089             magic != LOV_MAGIC_V1_DEF &&
1090             magic != LOV_MAGIC_V3_DEF) {
1091                 CDEBUG(D_IOCTL, "bad userland LOV MAGIC: %#x\n", magic);
1092                 GOTO(out, rc = -EINVAL);
1093         }
1094
1095         /* the user uses "0" for default stripe pattern normally. */
1096         if (!is_from_disk && lum->lmm_pattern == 0)
1097                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1098
1099         if (le32_to_cpu(lum->lmm_pattern) != LOV_PATTERN_RAID0) {
1100                 CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n",
1101                        le32_to_cpu(lum->lmm_pattern));
1102                 GOTO(out, rc = -EINVAL);
1103         }
1104
1105         /* 64kB is the largest common page size we see (ia64), and matches the
1106          * check in lfs */
1107         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1108         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1109                 CDEBUG(D_IOCTL, "stripe size %u not a multiple of %u\n",
1110                        stripe_size, LOV_MIN_STRIPE_SIZE);
1111                 GOTO(out, rc = -EINVAL);
1112         }
1113
1114         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1115         if (stripe_offset != LOV_OFFSET_DEFAULT) {
1116                 /* if offset is not within valid range [0, osts_size) */
1117                 if (stripe_offset >= d->lod_osts_size) {
1118                         CDEBUG(D_IOCTL, "stripe offset %u >= bitmap size %u\n",
1119                                stripe_offset, d->lod_osts_size);
1120                         GOTO(out, rc = -EINVAL);
1121                 }
1122
1123                 /* if lmm_stripe_offset is *not* in bitmap */
1124                 if (!cfs_bitmap_check(d->lod_ost_bitmap, stripe_offset)) {
1125                         CDEBUG(D_IOCTL, "stripe offset %u not in bitmap\n",
1126                                stripe_offset);
1127                         GOTO(out, rc = -EINVAL);
1128                 }
1129         }
1130
1131         if (magic == LOV_USER_MAGIC_V1 || magic == LOV_MAGIC_V1_DEF)
1132                 lum_size = offsetof(struct lov_user_md_v1,
1133                                     lmm_objects[0]);
1134         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_MAGIC_V3_DEF)
1135                 lum_size = offsetof(struct lov_user_md_v3,
1136                                     lmm_objects[0]);
1137         else
1138                 GOTO(out, rc = -EINVAL);
1139
1140         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1141         if (buf->lb_len != lum_size) {
1142                 CDEBUG(D_IOCTL, "invalid buf len %zu for lov_user_md with "
1143                        "magic %#x and stripe_count %u\n",
1144                        buf->lb_len, magic, stripe_count);
1145                 GOTO(out, rc = -EINVAL);
1146         }
1147
1148         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_MAGIC_V3_DEF))
1149                 goto out;
1150
1151         lum3 = buf->lb_buf;
1152         if (buf->lb_len < sizeof(*lum3)) {
1153                 CDEBUG(D_IOCTL, "buf len %zu too small for lov_user_md_v3\n",
1154                        buf->lb_len);
1155                 GOTO(out, rc = -EINVAL);
1156         }
1157
1158         /* In the function below, .hs_keycmp resolves to
1159          * pool_hashkey_keycmp() */
1160         /* coverity[overrun-buffer-val] */
1161         pool = lod_find_pool(d, lum3->lmm_pool_name);
1162         if (pool == NULL)
1163                 goto out;
1164
1165         if (stripe_offset != LOV_OFFSET_DEFAULT) {
1166                 rc = lod_check_index_in_pool(stripe_offset, pool);
1167                 if (rc < 0)
1168                         GOTO(out, rc = -EINVAL);
1169         }
1170
1171         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1172                 CDEBUG(D_IOCTL,
1173                        "stripe count %u > # OSTs %u in the pool\n",
1174                        stripe_count, pool_tgt_count(pool));
1175                 GOTO(out, rc = -EINVAL);
1176         }
1177
1178 out:
1179         if (pool != NULL)
1180                 lod_pool_putref(pool);
1181
1182         RETURN(rc);
1183 }
1184
1185 void lod_fix_desc_stripe_size(__u64 *val)
1186 {
1187         if (*val < LOV_MIN_STRIPE_SIZE) {
1188                 if (*val != 0)
1189                         LCONSOLE_INFO("Increasing default stripe size to "
1190                                       "minimum value %u\n",
1191                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
1192                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
1193         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
1194                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
1195                 LCONSOLE_WARN("Changing default stripe size to "LPU64" (a "
1196                               "multiple of %u)\n",
1197                               *val, LOV_MIN_STRIPE_SIZE);
1198         }
1199 }
1200
1201 void lod_fix_desc_stripe_count(__u32 *val)
1202 {
1203         if (*val == 0)
1204                 *val = 1;
1205 }
1206
1207 void lod_fix_desc_pattern(__u32 *val)
1208 {
1209         /* from lov_setstripe */
1210         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
1211                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
1212                 *val = 0;
1213         }
1214 }
1215
1216 void lod_fix_desc_qos_maxage(__u32 *val)
1217 {
1218         /* fix qos_maxage */
1219         if (*val == 0)
1220                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
1221 }
1222
1223 /**
1224  * Used to fix insane default striping.
1225  *
1226  * \param[in] desc      striping description
1227  */
1228 void lod_fix_desc(struct lov_desc *desc)
1229 {
1230         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
1231         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
1232         lod_fix_desc_pattern(&desc->ld_pattern);
1233         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
1234 }
1235
1236 /**
1237  * Initialize the structures used to store pools and default striping.
1238  *
1239  * \param[in] lod       LOD device
1240  * \param[in] lcfg      configuration structure storing default striping.
1241  *
1242  * \retval              0 if initialization succeeds
1243  * \retval              negative error number on failure
1244  */
1245 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
1246 {
1247         struct obd_device          *obd;
1248         struct lov_desc            *desc;
1249         int                         rc;
1250         ENTRY;
1251
1252         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1253         LASSERT(obd != NULL);
1254         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
1255
1256         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1257                 CERROR("LOD setup requires a descriptor\n");
1258                 RETURN(-EINVAL);
1259         }
1260
1261         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
1262
1263         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1264                 CERROR("descriptor size wrong: %d > %d\n",
1265                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1266                 RETURN(-EINVAL);
1267         }
1268
1269         if (desc->ld_magic != LOV_DESC_MAGIC) {
1270                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
1271                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
1272                                obd->obd_name, desc);
1273                         lustre_swab_lov_desc(desc);
1274                 } else {
1275                         CERROR("%s: Bad lov desc magic: %#x\n",
1276                                obd->obd_name, desc->ld_magic);
1277                         RETURN(-EINVAL);
1278                 }
1279         }
1280
1281         lod_fix_desc(desc);
1282
1283         desc->ld_active_tgt_count = 0;
1284         lod->lod_desc = *desc;
1285
1286         lod->lod_sp_me = LUSTRE_SP_CLI;
1287
1288         /* Set up allocation policy (QoS and RR) */
1289         INIT_LIST_HEAD(&lod->lod_qos.lq_oss_list);
1290         init_rwsem(&lod->lod_qos.lq_rw_sem);
1291         lod->lod_qos.lq_dirty = 1;
1292         lod->lod_qos.lq_rr.lqr_dirty = 1;
1293         lod->lod_qos.lq_reset = 1;
1294         /* Default priority is toward free space balance */
1295         lod->lod_qos.lq_prio_free = 232;
1296         /* Default threshold for rr (roughly 17%) */
1297         lod->lod_qos.lq_threshold_rr = 43;
1298
1299         /* Set up OST pool environment */
1300         lod->lod_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
1301                                                    HASH_POOLS_MAX_BITS,
1302                                                    HASH_POOLS_BKT_BITS, 0,
1303                                                    CFS_HASH_MIN_THETA,
1304                                                    CFS_HASH_MAX_THETA,
1305                                                    &pool_hash_operations,
1306                                                    CFS_HASH_DEFAULT);
1307         if (lod->lod_pools_hash_body == NULL)
1308                 RETURN(-ENOMEM);
1309
1310         INIT_LIST_HEAD(&lod->lod_pool_list);
1311         lod->lod_pool_count = 0;
1312         rc = lod_ost_pool_init(&lod->lod_pool_info, 0);
1313         if (rc)
1314                 GOTO(out_hash, rc);
1315         rc = lod_ost_pool_init(&lod->lod_qos.lq_rr.lqr_pool, 0);
1316         if (rc)
1317                 GOTO(out_pool_info, rc);
1318
1319         RETURN(0);
1320
1321 out_pool_info:
1322         lod_ost_pool_free(&lod->lod_pool_info);
1323 out_hash:
1324         cfs_hash_putref(lod->lod_pools_hash_body);
1325
1326         return rc;
1327 }
1328
1329 /**
1330  * Release the structures describing the pools.
1331  *
1332  * \param[in] lod       LOD device from which we release the structures
1333  *
1334  * \retval              0 always
1335  */
1336 int lod_pools_fini(struct lod_device *lod)
1337 {
1338         struct obd_device   *obd = lod2obd(lod);
1339         struct pool_desc    *pool, *tmp;
1340         ENTRY;
1341
1342         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
1343                 /* free pool structs */
1344                 CDEBUG(D_INFO, "delete pool %p\n", pool);
1345                 /* In the function below, .hs_keycmp resolves to
1346                  * pool_hashkey_keycmp() */
1347                 /* coverity[overrun-buffer-val] */
1348                 lod_pool_del(obd, pool->pool_name);
1349         }
1350
1351         cfs_hash_putref(lod->lod_pools_hash_body);
1352         lod_ost_pool_free(&(lod->lod_qos.lq_rr.lqr_pool));
1353         lod_ost_pool_free(&lod->lod_pool_info);
1354
1355         RETURN(0);
1356 }