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, 2015, Intel Corporation.
  27  */
  28 /*
  29  * lustre/lod/lod_lov.c
  30  *
  31  * A set of helpers to maintain Logical Object Volume (LOV)
  32  * Extended Attribute (EA) and known OST targets
  33  *
  34  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_MDS
  38
  39 #include <obd_class.h>
  40 #include <lustre_lfsck.h>
  41 #include <lustre_lmv.h>
  42 #include <lustre_swab.h>
  43
  44 #include "lod_internal.h"
  45
  46 /**
  47  * Increase reference count on the target table.
  48  *
  49  * Increase reference count on the target table usage to prevent racing with
  50  * addition/deletion. Any function that expects the table to remain
  51  * stationary must take a ref.
  52  *
  53  * \param[in] ltd       target table (lod_ost_descs or lod_mdt_descs)
  54  */
  55 void lod_getref(struct lod_tgt_descs *ltd)
  56 {
  57         down_read(&ltd->ltd_rw_sem);
  58         mutex_lock(&ltd->ltd_mutex);
  59         ltd->ltd_refcount++;
  60         mutex_unlock(&ltd->ltd_mutex);
  61 }
  62
  63 /**
  64  * Decrease reference count on the target table.
  65  *
  66  * Companion of lod_getref() to release a reference on the target table.
  67  * If this is the last reference and the OST entry was scheduled for deletion,
  68  * the descriptor is removed from the table.
  69  *
  70  * \param[in] lod       LOD device from which we release a reference
  71  * \param[in] ltd       target table (lod_ost_descs or lod_mdt_descs)
  72  */
  73 void lod_putref(struct lod_device *lod, struct lod_tgt_descs *ltd)
  74 {
  75         mutex_lock(&ltd->ltd_mutex);
  76         ltd->ltd_refcount--;
  77         if (ltd->ltd_refcount == 0 && ltd->ltd_death_row) {
  78                 struct lod_tgt_desc *tgt_desc, *tmp;
  79                 struct list_head kill;
  80                 unsigned int idx;
  81
  82                 CDEBUG(D_CONFIG, "destroying %d ltd desc\n",
  83                        ltd->ltd_death_row);
  84
  85                 INIT_LIST_HEAD(&kill);
  86
  87                 cfs_foreach_bit(ltd->ltd_tgt_bitmap, idx) {
  88                         tgt_desc = LTD_TGT(ltd, idx);
  89                         LASSERT(tgt_desc);
  90
  91                         if (!tgt_desc->ltd_reap)
  92                                 continue;
  93
  94                         list_add(&tgt_desc->ltd_kill, &kill);
  95                         LTD_TGT(ltd, idx) = NULL;
  96                         /*FIXME: only support ost pool for now */
  97                         if (ltd == &lod->lod_ost_descs) {
  98                                 lod_ost_pool_remove(&lod->lod_pool_info, idx);
  99                                 if (tgt_desc->ltd_active)
 100                                         lod->lod_desc.ld_active_tgt_count--;
 101                         }
 102                         ltd->ltd_tgtnr--;
 103                         cfs_bitmap_clear(ltd->ltd_tgt_bitmap, idx);
 104                         ltd->ltd_death_row--;
 105                 }
 106                 mutex_unlock(&ltd->ltd_mutex);
 107                 up_read(&ltd->ltd_rw_sem);
 108
 109                 list_for_each_entry_safe(tgt_desc, tmp, &kill, ltd_kill) {
 110                         int rc;
 111                         list_del(&tgt_desc->ltd_kill);
 112                         if (ltd == &lod->lod_ost_descs) {
 113                                 /* remove from QoS structures */
 114                                 rc = qos_del_tgt(lod, tgt_desc);
 115                                 if (rc)
 116                                         CERROR("%s: qos_del_tgt(%s) failed:"
 117                                                "rc = %d\n",
 118                                                lod2obd(lod)->obd_name,
 119                                               obd_uuid2str(&tgt_desc->ltd_uuid),
 120                                                rc);
 121                         }
 122                         rc = obd_disconnect(tgt_desc->ltd_exp);
 123                         if (rc)
 124                                 CERROR("%s: failed to disconnect %s: rc = %d\n",
 125                                        lod2obd(lod)->obd_name,
 126                                        obd_uuid2str(&tgt_desc->ltd_uuid), rc);
 127                         OBD_FREE_PTR(tgt_desc);
 128                 }
 129         } else {
 130                 mutex_unlock(&ltd->ltd_mutex);
 131                 up_read(&ltd->ltd_rw_sem);
 132         }
 133 }
 134
 135 /**
 136  * Expand size of target table.
 137  *
 138  * When the target table is full, we have to extend the table. To do so,
 139  * we allocate new memory with some reserve, move data from the old table
 140  * to the new one and release memory consumed by the old table.
 141  * Notice we take ltd_rw_sem exclusively to ensure atomic switch.
 142  *
 143  * \param[in] ltd               target table
 144  * \param[in] newsize           new size of the table
 145  *
 146  * \retval                      0 on success
 147  * \retval                      -ENOMEM if reallocation failed
 148  */
 149 static int ltd_bitmap_resize(struct lod_tgt_descs *ltd, __u32 newsize)
 150 {
 151         cfs_bitmap_t *new_bitmap, *old_bitmap = NULL;
 152         int           rc = 0;
 153         ENTRY;
 154
 155         /* grab write reference on the lod. Relocating the array requires
 156          * exclusive access */
 157
 158         down_write(&ltd->ltd_rw_sem);
 159         if (newsize <= ltd->ltd_tgts_size)
 160                 /* someone else has already resize the array */
 161                 GOTO(out, rc = 0);
 162
 163         /* allocate new bitmap */
 164         new_bitmap = CFS_ALLOCATE_BITMAP(newsize);
 165         if (!new_bitmap)
 166                 GOTO(out, rc = -ENOMEM);
 167
 168         if (ltd->ltd_tgts_size > 0) {
 169                 /* the bitmap already exists, we need
 170                  * to copy data from old one */
 171                 cfs_bitmap_copy(new_bitmap, ltd->ltd_tgt_bitmap);
 172                 old_bitmap = ltd->ltd_tgt_bitmap;
 173         }
 174
 175         ltd->ltd_tgts_size  = newsize;
 176         ltd->ltd_tgt_bitmap = new_bitmap;
 177
 178         if (old_bitmap)
 179                 CFS_FREE_BITMAP(old_bitmap);
 180
 181         CDEBUG(D_CONFIG, "tgt size: %d\n", ltd->ltd_tgts_size);
 182
 183         EXIT;
 184 out:
 185         up_write(&ltd->ltd_rw_sem);
 186         return rc;
 187 }
 188
 189 /**
 190  * Connect LOD to a new OSP and add it to the target table.
 191  *
 192  * Connect to the OSP device passed, initialize all the internal
 193  * structures related to the device and add it to the target table.
 194  *
 195  * \param[in] env               execution environment for this thread
 196  * \param[in] lod               LOD device to be connected to the new OSP
 197  * \param[in] osp               name of OSP device name to be added
 198  * \param[in] index             index of the new target
 199  * \param[in] gen               target's generation number
 200  * \param[in] tgt_index         OSP's group
 201  * \param[in] type              type of device (mdc or osc)
 202  * \param[in] active            state of OSP: 0 - inactive, 1 - active
 203  *
 204  * \retval                      0 if added successfully
 205  * \retval                      negative error number on failure
 206  */
 207 int lod_add_device(const struct lu_env *env, struct lod_device *lod,
 208                    char *osp, unsigned index, unsigned gen, int tgt_index,
 209                    char *type, int active)
 210 {
 211         struct obd_connect_data *data = NULL;
 212         struct obd_export       *exp = NULL;
 213         struct obd_device       *obd;
 214         struct lu_device        *lu_dev;
 215         struct dt_device        *dt_dev;
 216         int                      rc;
 217         struct lod_tgt_desc     *tgt_desc;
 218         struct lod_tgt_descs    *ltd;
 219         struct lustre_cfg       *lcfg;
 220         struct obd_uuid         obd_uuid;
 221         bool                    for_ost;
 222         bool lock = false;
 223         ENTRY;
 224
 225         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, index, gen);
 226
 227         if (gen <= 0) {
 228                 CERROR("request to add OBD %s with invalid generation: %d\n",
 229                        osp, gen);
 230                 RETURN(-EINVAL);
 231         }
 232
 233         obd_str2uuid(&obd_uuid, osp);
 234
 235         obd = class_find_client_obd(&obd_uuid, LUSTRE_OSP_NAME,
 236                                 &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 237         if (obd == NULL) {
 238                 CERROR("can't find %s device\n", osp);
 239                 RETURN(-EINVAL);
 240         }
 241
 242         LASSERT(obd->obd_lu_dev != NULL);
 243         LASSERT(obd->obd_lu_dev->ld_site == lod->lod_dt_dev.dd_lu_dev.ld_site);
 244
 245         lu_dev = obd->obd_lu_dev;
 246         dt_dev = lu2dt_dev(lu_dev);
 247
 248         OBD_ALLOC_PTR(data);
 249         if (data == NULL)
 250                 GOTO(out_cleanup, rc = -ENOMEM);
 251
 252         data->ocd_connect_flags = OBD_CONNECT_INDEX | OBD_CONNECT_VERSION;
 253         data->ocd_version = LUSTRE_VERSION_CODE;
 254         data->ocd_index = index;
 255
 256         if (strcmp(LUSTRE_OSC_NAME, type) == 0) {
 257                 for_ost = true;
 258                 data->ocd_connect_flags |= OBD_CONNECT_AT |
 259                                            OBD_CONNECT_FULL20 |
 260                                            OBD_CONNECT_INDEX |
 261 #ifdef HAVE_LRU_RESIZE_SUPPORT
 262                                            OBD_CONNECT_LRU_RESIZE |
 263 #endif
 264                                            OBD_CONNECT_MDS |
 265                                            OBD_CONNECT_REQPORTAL |
 266                                            OBD_CONNECT_SKIP_ORPHAN |
 267                                            OBD_CONNECT_FID |
 268                                            OBD_CONNECT_LVB_TYPE |
 269                                            OBD_CONNECT_VERSION |
 270                                            OBD_CONNECT_PINGLESS |
 271                                            OBD_CONNECT_LFSCK |
 272                                            OBD_CONNECT_BULK_MBITS;
 273
 274                 data->ocd_group = tgt_index;
 275                 ltd = &lod->lod_ost_descs;
 276         } else {
 277                 struct obd_import *imp = obd->u.cli.cl_import;
 278
 279                 for_ost = false;
 280                 data->ocd_ibits_known = MDS_INODELOCK_UPDATE;
 281                 data->ocd_connect_flags |= OBD_CONNECT_ACL |
 282                                            OBD_CONNECT_IBITS |
 283                                            OBD_CONNECT_MDS_MDS |
 284                                            OBD_CONNECT_FID |
 285                                            OBD_CONNECT_AT |
 286                                            OBD_CONNECT_FULL20 |
 287                                            OBD_CONNECT_LFSCK |
 288                                            OBD_CONNECT_BULK_MBITS;
 289                 spin_lock(&imp->imp_lock);
 290                 imp->imp_server_timeout = 1;
 291                 spin_unlock(&imp->imp_lock);
 292                 imp->imp_client->cli_request_portal = OUT_PORTAL;
 293                 CDEBUG(D_OTHER, "%s: Set 'mds' portal and timeout\n",
 294                       obd->obd_name);
 295                 ltd = &lod->lod_mdt_descs;
 296         }
 297
 298         rc = obd_connect(env, &exp, obd, &obd->obd_uuid, data, NULL);
 299         OBD_FREE_PTR(data);
 300         if (rc) {
 301                 CERROR("%s: cannot connect to next dev %s (%d)\n",
 302                        obd->obd_name, osp, rc);
 303                 GOTO(out_cleanup, rc);
 304         }
 305
 306         /* Allocate ost descriptor and fill it */
 307         OBD_ALLOC_PTR(tgt_desc);
 308         if (!tgt_desc)
 309                 GOTO(out_conn, rc = -ENOMEM);
 310
 311         tgt_desc->ltd_tgt    = dt_dev;
 312         tgt_desc->ltd_exp    = exp;
 313         tgt_desc->ltd_uuid   = obd->u.cli.cl_target_uuid;
 314         tgt_desc->ltd_gen    = gen;
 315         tgt_desc->ltd_index  = index;
 316         tgt_desc->ltd_active = active;
 317
 318         lod_getref(ltd);
 319         if (index >= ltd->ltd_tgts_size) {
 320                 /* we have to increase the size of the lod_osts array */
 321                 __u32  newsize;
 322
 323                 newsize = max(ltd->ltd_tgts_size, (__u32)2);
 324                 while (newsize < index + 1)
 325                         newsize = newsize << 1;
 326
 327                 /* lod_bitmap_resize() needs lod_rw_sem
 328                  * which we hold with th reference */
 329                 lod_putref(lod, ltd);
 330
 331                 rc = ltd_bitmap_resize(ltd, newsize);
 332                 if (rc)
 333                         GOTO(out_desc, rc);
 334
 335                 lod_getref(ltd);
 336         }
 337
 338         mutex_lock(&ltd->ltd_mutex);
 339         lock = true;
 340         if (cfs_bitmap_check(ltd->ltd_tgt_bitmap, index)) {
 341                 CERROR("%s: device %d is registered already\n", obd->obd_name,
 342                        index);
 343                 GOTO(out_mutex, rc = -EEXIST);
 344         }
 345
 346         if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 347                 OBD_ALLOC_PTR(ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK]);
 348                 if (ltd->ltd_tgt_idx[index / TGT_PTRS_PER_BLOCK] == NULL) {
 349                         CERROR("can't allocate index to add %s\n",
 350                                obd->obd_name);
 351                         GOTO(out_mutex, rc = -ENOMEM);
 352                 }
 353         }
 354
 355         if (for_ost) {
 356                 /* pool and qos are not supported for MDS stack yet */
 357                 rc = lod_ost_pool_add(&lod->lod_pool_info, index,
 358                                       lod->lod_osts_size);
 359                 if (rc) {
 360                         CERROR("%s: can't set up pool, failed with %d\n",
 361                                obd->obd_name, rc);
 362                         GOTO(out_mutex, rc);
 363                 }
 364
 365                 rc = qos_add_tgt(lod, tgt_desc);
 366                 if (rc) {
 367                         CERROR("%s: qos_add_tgt failed with %d\n",
 368                                 obd->obd_name, rc);
 369                         GOTO(out_pool, rc);
 370                 }
 371
 372                 /* The new OST is now a full citizen */
 373                 if (index >= lod->lod_desc.ld_tgt_count)
 374                         lod->lod_desc.ld_tgt_count = index + 1;
 375                 if (active)
 376                         lod->lod_desc.ld_active_tgt_count++;
 377         }
 378
 379         LTD_TGT(ltd, index) = tgt_desc;
 380         cfs_bitmap_set(ltd->ltd_tgt_bitmap, index);
 381         ltd->ltd_tgtnr++;
 382         mutex_unlock(&ltd->ltd_mutex);
 383         lod_putref(lod, ltd);
 384         lock = false;
 385         if (lod->lod_recovery_completed)
 386                 lu_dev->ld_ops->ldo_recovery_complete(env, lu_dev);
 387
 388         if (!for_ost && lod->lod_initialized) {
 389                 rc = lod_sub_init_llog(env, lod, tgt_desc->ltd_tgt);
 390                 if (rc != 0) {
 391                         CERROR("%s: cannot start llog on %s:rc = %d\n",
 392                                lod2obd(lod)->obd_name, osp, rc);
 393                         GOTO(out_ltd, rc);
 394                 }
 395         }
 396
 397         rc = lfsck_add_target(env, lod->lod_child, dt_dev, exp, index, for_ost);
 398         if (rc != 0) {
 399                 CERROR("Fail to add LFSCK target: name = %s, type = %s, "
 400                        "index = %u, rc = %d\n", osp, type, index, rc);
 401                 GOTO(out_fini_llog, rc);
 402         }
 403         RETURN(rc);
 404 out_fini_llog:
 405         lod_sub_fini_llog(env, tgt_desc->ltd_tgt,
 406                           tgt_desc->ltd_recovery_thread);
 407 out_ltd:
 408         lod_getref(ltd);
 409         mutex_lock(&ltd->ltd_mutex);
 410         lock = true;
 411         if (!for_ost && LTD_TGT(ltd, index)->ltd_recovery_thread != NULL) {
 412                 struct ptlrpc_thread *thread;
 413
 414                 thread = LTD_TGT(ltd, index)->ltd_recovery_thread;
 415                 OBD_FREE_PTR(thread);
 416         }
 417         ltd->ltd_tgtnr--;
 418         cfs_bitmap_clear(ltd->ltd_tgt_bitmap, index);
 419         LTD_TGT(ltd, index) = NULL;
 420 out_pool:
 421         lod_ost_pool_remove(&lod->lod_pool_info, index);
 422 out_mutex:
 423         if (lock) {
 424                 mutex_unlock(&ltd->ltd_mutex);
 425                 lod_putref(lod, ltd);
 426         }
 427 out_desc:
 428         OBD_FREE_PTR(tgt_desc);
 429 out_conn:
 430         obd_disconnect(exp);
 431 out_cleanup:
 432         /* XXX OSP needs us to send down LCFG_CLEANUP because it uses
 433          * objects from the MDT stack. See LU-7184. */
 434         lcfg = &lod_env_info(env)->lti_lustre_cfg;
 435         memset(lcfg, 0, sizeof(*lcfg));
 436         lcfg->lcfg_version = LUSTRE_CFG_VERSION;
 437         lcfg->lcfg_command = LCFG_CLEANUP;
 438         lu_dev->ld_ops->ldo_process_config(env, lu_dev, lcfg);
 439
 440         return rc;
 441 }
 442
 443 /**
 444  * Schedule target removal from the target table.
 445  *
 446  * Mark the device as dead. The device is not removed here because it may
 447  * still be in use. The device will be removed in lod_putref() when the
 448  * last reference is released.
 449  *
 450  * \param[in] env               execution environment for this thread
 451  * \param[in] lod               LOD device the target table belongs to
 452  * \param[in] ltd               target table
 453  * \param[in] idx               index of the target
 454  * \param[in] for_ost           type of the target: 0 - MDT, 1 - OST
 455  */
 456 static void __lod_del_device(const struct lu_env *env, struct lod_device *lod,
 457                              struct lod_tgt_descs *ltd, unsigned idx,
 458                              bool for_ost)
 459 {
 460         LASSERT(LTD_TGT(ltd, idx));
 461
 462         lfsck_del_target(env, lod->lod_child, LTD_TGT(ltd, idx)->ltd_tgt,
 463                          idx, for_ost);
 464
 465         if (!for_ost && LTD_TGT(ltd, idx)->ltd_recovery_thread != NULL) {
 466                 struct ptlrpc_thread *thread;
 467
 468                 thread = LTD_TGT(ltd, idx)->ltd_recovery_thread;
 469                 OBD_FREE_PTR(thread);
 470         }
 471
 472         if (LTD_TGT(ltd, idx)->ltd_reap == 0) {
 473                 LTD_TGT(ltd, idx)->ltd_reap = 1;
 474                 ltd->ltd_death_row++;
 475         }
 476 }
 477
 478 /**
 479  * Schedule removal of all the targets from the given target table.
 480  *
 481  * See more details in the description for __lod_del_device()
 482  *
 483  * \param[in] env               execution environment for this thread
 484  * \param[in] lod               LOD device the target table belongs to
 485  * \param[in] ltd               target table
 486  * \param[in] for_ost           type of the target: MDT or OST
 487  *
 488  * \retval                      0 always
 489  */
 490 int lod_fini_tgt(const struct lu_env *env, struct lod_device *lod,
 491                  struct lod_tgt_descs *ltd, bool for_ost)
 492 {
 493         unsigned int idx;
 494
 495         if (ltd->ltd_tgts_size <= 0)
 496                 return 0;
 497         lod_getref(ltd);
 498         mutex_lock(&ltd->ltd_mutex);
 499         cfs_foreach_bit(ltd->ltd_tgt_bitmap, idx)
 500                 __lod_del_device(env, lod, ltd, idx, for_ost);
 501         mutex_unlock(&ltd->ltd_mutex);
 502         lod_putref(lod, ltd);
 503         CFS_FREE_BITMAP(ltd->ltd_tgt_bitmap);
 504         for (idx = 0; idx < TGT_PTRS; idx++) {
 505                 if (ltd->ltd_tgt_idx[idx])
 506                         OBD_FREE_PTR(ltd->ltd_tgt_idx[idx]);
 507         }
 508         ltd->ltd_tgts_size = 0;
 509         return 0;
 510 }
 511
 512 /**
 513  * Remove device by name.
 514  *
 515  * Remove a device identified by \a osp from the target table. Given
 516  * the device can be in use, the real deletion happens in lod_putref().
 517  *
 518  * \param[in] env               execution environment for this thread
 519  * \param[in] lod               LOD device to be connected to the new OSP
 520  * \param[in] ltd               target table
 521  * \param[in] osp               name of OSP device to be removed
 522  * \param[in] idx               index of the target
 523  * \param[in] gen               generation number, not used currently
 524  * \param[in] for_ost           type of the target: 0 - MDT, 1 - OST
 525  *
 526  * \retval                      0 if the device was scheduled for removal
 527  * \retval                      -EINVAL if no device was found
 528  */
 529 int lod_del_device(const struct lu_env *env, struct lod_device *lod,
 530                    struct lod_tgt_descs *ltd, char *osp, unsigned idx,
 531                    unsigned gen, bool for_ost)
 532 {
 533         struct obd_device *obd;
 534         int                rc = 0;
 535         struct obd_uuid    uuid;
 536         ENTRY;
 537
 538         CDEBUG(D_CONFIG, "osp:%s idx:%d gen:%d\n", osp, idx, gen);
 539
 540         obd_str2uuid(&uuid, osp);
 541
 542         obd = class_find_client_obd(&uuid, LUSTRE_OSP_NAME,
 543                                    &lod->lod_dt_dev.dd_lu_dev.ld_obd->obd_uuid);
 544         if (obd == NULL) {
 545                 CERROR("can't find %s device\n", osp);
 546                 RETURN(-EINVAL);
 547         }
 548
 549         if (gen <= 0) {
 550                 CERROR("%s: request to remove OBD %s with invalid generation %d"
 551                        "\n", obd->obd_name, osp, gen);
 552                 RETURN(-EINVAL);
 553         }
 554
 555         obd_str2uuid(&uuid,  osp);
 556
 557         lod_getref(ltd);
 558         mutex_lock(&ltd->ltd_mutex);
 559         /* check that the index is allocated in the bitmap */
 560         if (!cfs_bitmap_check(ltd->ltd_tgt_bitmap, idx) ||
 561             !LTD_TGT(ltd, idx)) {
 562                 CERROR("%s: device %d is not set up\n", obd->obd_name, idx);
 563                 GOTO(out, rc = -EINVAL);
 564         }
 565
 566         /* check that the UUID matches */
 567         if (!obd_uuid_equals(&uuid, &LTD_TGT(ltd, idx)->ltd_uuid)) {
 568                 CERROR("%s: LOD target UUID %s at index %d does not match %s\n",
 569                        obd->obd_name, obd_uuid2str(&LTD_TGT(ltd,idx)->ltd_uuid),
 570                        idx, osp);
 571                 GOTO(out, rc = -EINVAL);
 572         }
 573
 574         __lod_del_device(env, lod, ltd, idx, for_ost);
 575         EXIT;
 576 out:
 577         mutex_unlock(&ltd->ltd_mutex);
 578         lod_putref(lod, ltd);
 579         return(rc);
 580 }
 581
 582 /**
 583  * Resize per-thread storage to hold specified size.
 584  *
 585  * A helper function to resize per-thread temporary storage. This storage
 586  * is used to process LOV/LVM EAs and may be quite large. We do not want to
 587  * allocate/release it every time, so instead we put it into the env and
 588  * reallocate on demand. The memory is released when the correspondent thread
 589  * is finished.
 590  *
 591  * \param[in] info              LOD-specific storage in the environment
 592  * \param[in] size              new size to grow the buffer to
 593
 594  * \retval                      0 on success, -ENOMEM if reallocation failed
 595  */
 596 int lod_ea_store_resize(struct lod_thread_info *info, size_t size)
 597 {
 598         __u32 round = size_roundup_power2(size);
 599
 600         LASSERT(round <=
 601                 lov_mds_md_size(LOV_MAX_STRIPE_COUNT, LOV_MAGIC_V3));
 602         if (info->lti_ea_store) {
 603                 LASSERT(info->lti_ea_store_size);
 604                 LASSERT(info->lti_ea_store_size < round);
 605                 CDEBUG(D_INFO, "EA store size %d is not enough, need %d\n",
 606                        info->lti_ea_store_size, round);
 607                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
 608                 info->lti_ea_store = NULL;
 609                 info->lti_ea_store_size = 0;
 610         }
 611
 612         OBD_ALLOC_LARGE(info->lti_ea_store, round);
 613         if (info->lti_ea_store == NULL)
 614                 RETURN(-ENOMEM);
 615         info->lti_ea_store_size = round;
 616
 617         RETURN(0);
 618 }
 619
 620 /**
 621  * Make LOV EA for striped object.
 622  *
 623  * Generate striping information and store it in the LOV EA of the given
 624  * object. The caller must ensure nobody else is calling the function
 625  * against the object concurrently. The transaction must be started.
 626  * FLDB service must be running as well; it's used to map FID to the target,
 627  * which is stored in LOV EA.
 628  *
 629  * \param[in] env               execution environment for this thread
 630  * \param[in] lo                LOD object
 631  * \param[in] th                transaction handle
 632  *
 633  * \retval                      0 if LOV EA is stored successfully
 634  * \retval                      negative error number on failure
 635  */
 636 int lod_generate_and_set_lovea(const struct lu_env *env,
 637                                struct lod_object *lo, struct thandle *th)
 638 {
 639         struct lod_thread_info  *info = lod_env_info(env);
 640         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 641         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
 642         struct lov_mds_md_v1    *lmm;
 643         struct lov_ost_data_v1  *objs;
 644         __u32                    magic;
 645         int                      i, rc;
 646         size_t                   lmm_size;
 647         ENTRY;
 648
 649         LASSERT(lo);
 650
 651         magic = lo->ldo_pool != NULL ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
 652         lmm_size = lov_mds_md_size(lo->ldo_stripenr, magic);
 653         if (info->lti_ea_store_size < lmm_size) {
 654                 rc = lod_ea_store_resize(info, lmm_size);
 655                 if (rc)
 656                         RETURN(rc);
 657         }
 658
 659         if (lo->ldo_pattern == 0) /* default striping */
 660                 lo->ldo_pattern = LOV_PATTERN_RAID0;
 661
 662         lmm = info->lti_ea_store;
 663
 664         lmm->lmm_magic = cpu_to_le32(magic);
 665         lmm->lmm_pattern = cpu_to_le32(lo->ldo_pattern);
 666         fid_to_lmm_oi(fid, &lmm->lmm_oi);
 667         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
 668                 lmm->lmm_oi.oi.oi_id++;
 669         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
 670         lmm->lmm_stripe_size = cpu_to_le32(lo->ldo_stripe_size);
 671         lmm->lmm_stripe_count = cpu_to_le16(lo->ldo_stripenr);
 672         if (lo->ldo_pattern & LOV_PATTERN_F_RELEASED)
 673                 lmm->lmm_stripe_count = cpu_to_le16(lo->ldo_released_stripenr);
 674         lmm->lmm_layout_gen = 0;
 675         if (magic == LOV_MAGIC_V1) {
 676                 objs = &lmm->lmm_objects[0];
 677         } else {
 678                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *) lmm;
 679                 size_t cplen = strlcpy(v3->lmm_pool_name, lo->ldo_pool,
 680                                 sizeof(v3->lmm_pool_name));
 681                 if (cplen >= sizeof(v3->lmm_pool_name))
 682                         RETURN(-E2BIG);
 683                 objs = &v3->lmm_objects[0];
 684         }
 685
 686         for (i = 0; i < lo->ldo_stripenr; i++) {
 687                 struct lu_fid           *fid    = &info->lti_fid;
 688                 struct lod_device       *lod;
 689                 __u32                   index;
 690                 int                     type    = LU_SEQ_RANGE_OST;
 691
 692                 lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 693                 LASSERT(lo->ldo_stripe[i]);
 694
 695                 *fid = *lu_object_fid(&lo->ldo_stripe[i]->do_lu);
 696                 if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF)) {
 697                         if (cfs_fail_val == 0)
 698                                 cfs_fail_val = fid->f_oid;
 699                         else
 700                                 fid->f_oid = cfs_fail_val;
 701                 }
 702
 703                 rc = fid_to_ostid(fid, &info->lti_ostid);
 704                 LASSERT(rc == 0);
 705
 706                 ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 707                 objs[i].l_ost_gen    = cpu_to_le32(0);
 708                 if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FLD_LOOKUP))
 709                         rc = -ENOENT;
 710                 else
 711                         rc = lod_fld_lookup(env, lod, fid,
 712                                             &index, &type);
 713                 if (rc < 0) {
 714                         CERROR("%s: Can not locate "DFID": rc = %d\n",
 715                                lod2obd(lod)->obd_name, PFID(fid), rc);
 716                         lod_object_free_striping(env, lo);
 717                         RETURN(rc);
 718                 }
 719                 objs[i].l_ost_idx = cpu_to_le32(index);
 720         }
 721
 722         info->lti_buf.lb_buf = lmm;
 723         info->lti_buf.lb_len = lmm_size;
 724         rc = lod_sub_object_xattr_set(env, next, &info->lti_buf, XATTR_NAME_LOV,
 725                                       0, th);
 726         if (rc < 0) {
 727                 lod_object_free_striping(env, lo);
 728                 RETURN(rc);
 729         }
 730
 731         RETURN(rc);
 732 }
 733
 734 /**
 735  * Get LOV EA.
 736  *
 737  * Fill lti_ea_store buffer in the environment with a value for the given
 738  * EA. The buffer is reallocated if the value doesn't fit.
 739  *
 740  * \param[in,out] env           execution environment for this thread
 741  *                              .lti_ea_store buffer is filled with EA's value
 742  * \param[in] lo                LOD object
 743  * \param[in] name              name of the EA
 744  *
 745  * \retval                      0 if EA is fetched successfully
 746  * \retval                      negative error number on failure
 747  */
 748 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
 749                const char *name)
 750 {
 751         struct lod_thread_info  *info = lod_env_info(env);
 752         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 753         int                     rc;
 754         ENTRY;
 755
 756         LASSERT(info);
 757
 758         if (unlikely(info->lti_ea_store == NULL)) {
 759                 /* just to enter in allocation block below */
 760                 rc = -ERANGE;
 761         } else {
 762 repeat:
 763                 info->lti_buf.lb_buf = info->lti_ea_store;
 764                 info->lti_buf.lb_len = info->lti_ea_store_size;
 765                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
 766         }
 767
 768         /* if object is not striped or inaccessible */
 769         if (rc == -ENODATA || rc == -ENOENT)
 770                 RETURN(0);
 771
 772         if (rc == -ERANGE) {
 773                 /* EA doesn't fit, reallocate new buffer */
 774                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
 775                 if (rc == -ENODATA || rc == -ENOENT)
 776                         RETURN(0);
 777                 else if (rc < 0)
 778                         RETURN(rc);
 779
 780                 LASSERT(rc > 0);
 781                 rc = lod_ea_store_resize(info, rc);
 782                 if (rc)
 783                         RETURN(rc);
 784                 goto repeat;
 785         }
 786
 787         RETURN(rc);
 788 }
 789
 790 /**
 791  * Verify the target index is present in the current configuration.
 792  *
 793  * \param[in] md                LOD device where the target table is stored
 794  * \param[in] idx               target's index
 795  *
 796  * \retval                      0 if the index is present
 797  * \retval                      -EINVAL if not
 798  */
 799 static int validate_lod_and_idx(struct lod_device *md, __u32 idx)
 800 {
 801         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
 802                      !cfs_bitmap_check(md->lod_ost_bitmap, idx))) {
 803                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
 804                        md->lod_ost_descs.ltd_tgts_size);
 805                 return -EINVAL;
 806         }
 807
 808         if (unlikely(OST_TGT(md, idx) == NULL)) {
 809                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
 810                        lod2obd(md)->obd_name, idx);
 811                 return -EINVAL;
 812         }
 813
 814         if (unlikely(OST_TGT(md, idx)->ltd_ost == NULL)) {
 815                 CERROR("%s: invalid lod device, for idx: %d\n",
 816                        lod2obd(md)->obd_name , idx);
 817                 return -EINVAL;
 818         }
 819
 820         return 0;
 821 }
 822
 823 /**
 824  * Instantiate objects for stripes.
 825  *
 826  * Allocate and initialize LU-objects representing the stripes. The number
 827  * of the stripes (ldo_stripenr) must be initialized already. The caller
 828  * must ensure nobody else is calling the function on the object at the same
 829  * time. FLDB service must be running to be able to map a FID to the targets
 830  * and find appropriate device representing that target.
 831  *
 832  * \param[in] env               execution environment for this thread
 833  * \param[in,out] lo            LOD object
 834  * \param[in] objs              an array of IDs to creates the objects from
 835  *
 836  * \retval                      0 if the objects are instantiated successfully
 837  * \retval                      negative error number on failure
 838  */
 839 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
 840                            struct lov_ost_data_v1 *objs)
 841 {
 842         struct lod_thread_info  *info = lod_env_info(env);
 843         struct lod_device       *md;
 844         struct lu_object        *o, *n;
 845         struct lu_device        *nd;
 846         struct dt_object       **stripe;
 847         int                      stripe_len;
 848         int                      i, rc = 0;
 849         __u32                   idx;
 850         ENTRY;
 851
 852         LASSERT(lo != NULL);
 853         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 854         LASSERT(lo->ldo_stripe == NULL);
 855         LASSERT(lo->ldo_stripenr > 0);
 856         LASSERT(lo->ldo_stripe_size > 0);
 857
 858         stripe_len = lo->ldo_stripenr;
 859         OBD_ALLOC(stripe, sizeof(stripe[0]) * stripe_len);
 860         if (stripe == NULL)
 861                 RETURN(-ENOMEM);
 862
 863         for (i = 0; i < lo->ldo_stripenr; i++) {
 864                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
 865                         continue;
 866
 867                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
 868                 idx = le32_to_cpu(objs[i].l_ost_idx);
 869                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
 870                 if (rc != 0)
 871                         GOTO(out, rc);
 872                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
 873                          PFID(&info->lti_fid));
 874                 lod_getref(&md->lod_ost_descs);
 875
 876                 rc = validate_lod_and_idx(md, idx);
 877                 if (unlikely(rc != 0)) {
 878                         lod_putref(md, &md->lod_ost_descs);
 879                         GOTO(out, rc);
 880                 }
 881
 882                 nd = &OST_TGT(md,idx)->ltd_ost->dd_lu_dev;
 883                 lod_putref(md, &md->lod_ost_descs);
 884
 885                 /* In the function below, .hs_keycmp resolves to
 886                  * u_obj_hop_keycmp() */
 887                 /* coverity[overrun-buffer-val] */
 888                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
 889                 if (IS_ERR(o))
 890                         GOTO(out, rc = PTR_ERR(o));
 891
 892                 n = lu_object_locate(o->lo_header, nd->ld_type);
 893                 LASSERT(n);
 894
 895                 stripe[i] = container_of(n, struct dt_object, do_lu);
 896         }
 897
 898 out:
 899         if (rc != 0) {
 900                 for (i = 0; i < stripe_len; i++)
 901                         if (stripe[i] != NULL)
 902                                 lu_object_put(env, &stripe[i]->do_lu);
 903
 904                 OBD_FREE(stripe, sizeof(stripe[0]) * stripe_len);
 905                 lo->ldo_stripenr = 0;
 906         } else {
 907                 lo->ldo_stripe = stripe;
 908                 lo->ldo_stripes_allocated = stripe_len;
 909         }
 910
 911         RETURN(rc);
 912 }
 913
 914 /**
 915  * Instantiate objects for striping.
 916  *
 917  * Parse striping information in \a buf and instantiate the objects
 918  * representing the stripes.
 919  *
 920  * \param[in] env               execution environment for this thread
 921  * \param[in] lo                LOD object
 922  * \param[in] buf               buffer storing LOV EA to parse
 923  *
 924  * \retval                      0 if parsing and objects creation succeed
 925  * \retval                      negative error number on failure
 926  */
 927 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
 928                        const struct lu_buf *buf)
 929 {
 930         struct lov_mds_md_v1    *lmm;
 931         struct lov_ost_data_v1  *objs;
 932         __u32                    magic;
 933         __u32                    pattern;
 934         int                      rc = 0;
 935         ENTRY;
 936
 937         LASSERT(buf);
 938         LASSERT(buf->lb_buf);
 939         LASSERT(buf->lb_len);
 940
 941         lmm = (struct lov_mds_md_v1 *) buf->lb_buf;
 942         magic = le32_to_cpu(lmm->lmm_magic);
 943         pattern = le32_to_cpu(lmm->lmm_pattern);
 944
 945         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3)
 946                 GOTO(out, rc = -EINVAL);
 947         if (lov_pattern(pattern) != LOV_PATTERN_RAID0)
 948                 GOTO(out, rc = -EINVAL);
 949
 950         lo->ldo_pattern = pattern;
 951         lo->ldo_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
 952         lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
 953         lo->ldo_stripenr = le16_to_cpu(lmm->lmm_stripe_count);
 954         /* released file stripenr fixup. */
 955         if (pattern & LOV_PATTERN_F_RELEASED)
 956                 lo->ldo_stripenr = 0;
 957
 958         LASSERT(buf->lb_len >= lov_mds_md_size(lo->ldo_stripenr, magic));
 959
 960         if (magic == LOV_MAGIC_V3) {
 961                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *) lmm;
 962                 objs = &v3->lmm_objects[0];
 963                 lod_object_set_pool(lo, v3->lmm_pool_name);
 964         } else {
 965                 objs = &lmm->lmm_objects[0];
 966         }
 967
 968         if (lo->ldo_stripenr > 0)
 969                 rc = lod_initialize_objects(env, lo, objs);
 970
 971 out:
 972         RETURN(rc);
 973 }
 974
 975 /**
 976  * Initialize the object representing the stripes.
 977  *
 978  * Unless the stripes are initialized already, fetch LOV (for regular
 979  * objects) or LMV (for directory objects) EA and call lod_parse_striping()
 980  * to instantiate the objects representing the stripes.
 981  *
 982  * \param[in] env               execution environment for this thread
 983  * \param[in,out] lo            LOD object
 984  *
 985  * \retval                      0 if parsing and object creation succeed
 986  * \retval                      negative error number on failure
 987  */
 988 int lod_load_striping_locked(const struct lu_env *env, struct lod_object *lo)
 989 {
 990         struct lod_thread_info  *info = lod_env_info(env);
 991         struct lu_buf           *buf  = &info->lti_buf;
 992         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
 993         int                      rc = 0;
 994         ENTRY;
 995
 996         /* already initialized? */
 997         if (lo->ldo_stripe != NULL)
 998                 GOTO(out, rc = 0);
 999
1000         if (!dt_object_exists(next))
1001                 GOTO(out, rc = 0);
1002
1003         /* Do not load stripe for slaves of striped dir */
1004         if (lo->ldo_dir_slave_stripe)
1005                 GOTO(out, rc = 0);
1006
1007         if (S_ISREG(lu_object_attr(lod2lu_obj(lo)))) {
1008                 rc = lod_get_lov_ea(env, lo);
1009                 if (rc <= 0)
1010                         GOTO(out, rc);
1011                 /*
1012                  * there is LOV EA (striping information) in this object
1013                  * let's parse it and create in-core objects for the stripes
1014                  */
1015                 buf->lb_buf = info->lti_ea_store;
1016                 buf->lb_len = info->lti_ea_store_size;
1017                 rc = lod_parse_striping(env, lo, buf);
1018         } else if (S_ISDIR(lu_object_attr(lod2lu_obj(lo)))) {
1019                 rc = lod_get_lmv_ea(env, lo);
1020                 if (rc < (typeof(rc))sizeof(struct lmv_mds_md_v1))
1021                         GOTO(out, rc = rc > 0 ? -EINVAL : rc);
1022
1023                 buf->lb_buf = info->lti_ea_store;
1024                 buf->lb_len = info->lti_ea_store_size;
1025                 if (rc == sizeof(struct lmv_mds_md_v1)) {
1026                         rc = lod_load_lmv_shards(env, lo, buf, true);
1027                         if (buf->lb_buf != info->lti_ea_store) {
1028                                 OBD_FREE_LARGE(info->lti_ea_store,
1029                                                info->lti_ea_store_size);
1030                                 info->lti_ea_store = buf->lb_buf;
1031                                 info->lti_ea_store_size = buf->lb_len;
1032                         }
1033
1034                         if (rc < 0)
1035                                 GOTO(out, rc);
1036                 }
1037
1038                 /*
1039                  * there is LOV EA (striping information) in this object
1040                  * let's parse it and create in-core objects for the stripes
1041                  */
1042                 rc = lod_parse_dir_striping(env, lo, buf);
1043         }
1044
1045         if (rc == 0)
1046                 lo->ldo_striping_cached = 1;
1047 out:
1048         RETURN(rc);
1049 }
1050
1051 /**
1052  * A generic function to initialize the stripe objects.
1053  *
1054  * A protected version of lod_load_striping_locked() - load the striping
1055  * information from storage, parse that and instantiate LU objects to
1056  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1057  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1058  * return an array of references to the newly instantiated objects.
1059  *
1060  * \param[in] env               execution environment for this thread
1061  * \param[in,out] lo            LOD object, where striping is stored and
1062  *                              which gets an array of references
1063  *
1064  * \retval                      0 if parsing and object creation succeed
1065  * \retval                      negative error number on failure
1066  **/
1067 int lod_load_striping(const struct lu_env *env, struct lod_object *lo)
1068 {
1069         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
1070         int                     rc = 0;
1071
1072         /* currently this code is supposed to be called from declaration
1073          * phase only, thus the object is not expected to be locked by caller */
1074         dt_write_lock(env, next, 0);
1075         rc = lod_load_striping_locked(env, lo);
1076         dt_write_unlock(env, next);
1077         return rc;
1078 }
1079
1080 /**
1081  * Verify striping.
1082  *
1083  * Check the validity of all fields including the magic, stripe size,
1084  * stripe count, stripe offset and that the pool is present.  Also check
1085  * that each target index points to an existing target. The additional
1086  * \a is_from_disk turns additional checks. In some cases zero fields
1087  * are allowed (like pattern=0).
1088  *
1089  * \param[in] d                 LOD device
1090  * \param[in] buf               buffer with LOV EA to verify
1091  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1092  *                              1 - from disk, do not allow
1093  *
1094  * \retval                      0 if the striping is valid
1095  * \retval                      -EINVAL if striping is invalid
1096  */
1097 int lod_verify_striping(struct lod_device *d, const struct lu_buf *buf,
1098                         bool is_from_disk)
1099 {
1100         struct lov_user_md_v1   *lum;
1101         struct lov_user_md_v3   *lum3;
1102         struct pool_desc        *pool = NULL;
1103         __u32                    magic;
1104         __u32                    stripe_size;
1105         __u16                    stripe_count;
1106         __u16                    stripe_offset;
1107         size_t                   lum_size;
1108         int                      rc = 0;
1109         ENTRY;
1110
1111         lum = buf->lb_buf;
1112
1113         LASSERT(sizeof(*lum) < sizeof(*lum3));
1114
1115         if (buf->lb_len < sizeof(*lum)) {
1116                 CDEBUG(D_IOCTL, "buf len %zu too small for lov_user_md\n",
1117                        buf->lb_len);
1118                 GOTO(out, rc = -EINVAL);
1119         }
1120
1121         magic = le32_to_cpu(lum->lmm_magic);
1122         if (magic != LOV_USER_MAGIC_V1 &&
1123             magic != LOV_USER_MAGIC_V3 &&
1124             magic != LOV_MAGIC_V1_DEF &&
1125             magic != LOV_MAGIC_V3_DEF) {
1126                 CDEBUG(D_IOCTL, "bad userland LOV MAGIC: %#x\n", magic);
1127                 GOTO(out, rc = -EINVAL);
1128         }
1129
1130         /* the user uses "0" for default stripe pattern normally. */
1131         if (!is_from_disk && lum->lmm_pattern == 0)
1132                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1133
1134         if (le32_to_cpu(lum->lmm_pattern) != LOV_PATTERN_RAID0) {
1135                 CDEBUG(D_IOCTL, "bad userland stripe pattern: %#x\n",
1136                        le32_to_cpu(lum->lmm_pattern));
1137                 GOTO(out, rc = -EINVAL);
1138         }
1139
1140         /* 64kB is the largest common page size we see (ia64), and matches the
1141          * check in lfs */
1142         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1143         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1144                 CDEBUG(D_IOCTL, "stripe size %u not a multiple of %u\n",
1145                        stripe_size, LOV_MIN_STRIPE_SIZE);
1146                 GOTO(out, rc = -EINVAL);
1147         }
1148
1149         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1150         if (stripe_offset != LOV_OFFSET_DEFAULT) {
1151                 /* if offset is not within valid range [0, osts_size) */
1152                 if (stripe_offset >= d->lod_osts_size) {
1153                         CDEBUG(D_IOCTL, "stripe offset %u >= bitmap size %u\n",
1154                                stripe_offset, d->lod_osts_size);
1155                         GOTO(out, rc = -EINVAL);
1156                 }
1157
1158                 /* if lmm_stripe_offset is *not* in bitmap */
1159                 if (!cfs_bitmap_check(d->lod_ost_bitmap, stripe_offset)) {
1160                         CDEBUG(D_IOCTL, "stripe offset %u not in bitmap\n",
1161                                stripe_offset);
1162                         GOTO(out, rc = -EINVAL);
1163                 }
1164         }
1165
1166         if (magic == LOV_USER_MAGIC_V1 || magic == LOV_MAGIC_V1_DEF)
1167                 lum_size = offsetof(struct lov_user_md_v1,
1168                                     lmm_objects[0]);
1169         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_MAGIC_V3_DEF)
1170                 lum_size = offsetof(struct lov_user_md_v3,
1171                                     lmm_objects[0]);
1172         else
1173                 GOTO(out, rc = -EINVAL);
1174
1175         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1176         if (buf->lb_len != lum_size) {
1177                 CDEBUG(D_IOCTL, "invalid buf len %zu for lov_user_md with "
1178                        "magic %#x and stripe_count %u\n",
1179                        buf->lb_len, magic, stripe_count);
1180                 GOTO(out, rc = -EINVAL);
1181         }
1182
1183         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_MAGIC_V3_DEF))
1184                 goto out;
1185
1186         lum3 = buf->lb_buf;
1187         if (buf->lb_len < sizeof(*lum3)) {
1188                 CDEBUG(D_IOCTL, "buf len %zu too small for lov_user_md_v3\n",
1189                        buf->lb_len);
1190                 GOTO(out, rc = -EINVAL);
1191         }
1192
1193         /* In the function below, .hs_keycmp resolves to
1194          * pool_hashkey_keycmp() */
1195         /* coverity[overrun-buffer-val] */
1196         pool = lod_find_pool(d, lum3->lmm_pool_name);
1197         if (pool == NULL)
1198                 goto out;
1199
1200         if (stripe_offset != LOV_OFFSET_DEFAULT) {
1201                 rc = lod_check_index_in_pool(stripe_offset, pool);
1202                 if (rc < 0)
1203                         GOTO(out, rc = -EINVAL);
1204         }
1205
1206         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1207                 CDEBUG(D_IOCTL,
1208                        "stripe count %u > # OSTs %u in the pool\n",
1209                        stripe_count, pool_tgt_count(pool));
1210                 GOTO(out, rc = -EINVAL);
1211         }
1212
1213 out:
1214         if (pool != NULL)
1215                 lod_pool_putref(pool);
1216
1217         RETURN(rc);
1218 }
1219
1220 void lod_fix_desc_stripe_size(__u64 *val)
1221 {
1222         if (*val < LOV_MIN_STRIPE_SIZE) {
1223                 if (*val != 0)
1224                         LCONSOLE_INFO("Increasing default stripe size to "
1225                                       "minimum value %u\n",
1226                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
1227                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
1228         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
1229                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
1230                 LCONSOLE_WARN("Changing default stripe size to "LPU64" (a "
1231                               "multiple of %u)\n",
1232                               *val, LOV_MIN_STRIPE_SIZE);
1233         }
1234 }
1235
1236 void lod_fix_desc_stripe_count(__u32 *val)
1237 {
1238         if (*val == 0)
1239                 *val = 1;
1240 }
1241
1242 void lod_fix_desc_pattern(__u32 *val)
1243 {
1244         /* from lov_setstripe */
1245         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
1246                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
1247                 *val = 0;
1248         }
1249 }
1250
1251 void lod_fix_desc_qos_maxage(__u32 *val)
1252 {
1253         /* fix qos_maxage */
1254         if (*val == 0)
1255                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
1256 }
1257
1258 /**
1259  * Used to fix insane default striping.
1260  *
1261  * \param[in] desc      striping description
1262  */
1263 void lod_fix_desc(struct lov_desc *desc)
1264 {
1265         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
1266         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
1267         lod_fix_desc_pattern(&desc->ld_pattern);
1268         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
1269 }
1270
1271 /**
1272  * Initialize the structures used to store pools and default striping.
1273  *
1274  * \param[in] lod       LOD device
1275  * \param[in] lcfg      configuration structure storing default striping.
1276  *
1277  * \retval              0 if initialization succeeds
1278  * \retval              negative error number on failure
1279  */
1280 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
1281 {
1282         struct obd_device          *obd;
1283         struct lov_desc            *desc;
1284         int                         rc;
1285         ENTRY;
1286
1287         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1288         LASSERT(obd != NULL);
1289         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
1290
1291         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1292                 CERROR("LOD setup requires a descriptor\n");
1293                 RETURN(-EINVAL);
1294         }
1295
1296         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
1297
1298         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1299                 CERROR("descriptor size wrong: %d > %d\n",
1300                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1301                 RETURN(-EINVAL);
1302         }
1303
1304         if (desc->ld_magic != LOV_DESC_MAGIC) {
1305                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
1306                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
1307                                obd->obd_name, desc);
1308                         lustre_swab_lov_desc(desc);
1309                 } else {
1310                         CERROR("%s: Bad lov desc magic: %#x\n",
1311                                obd->obd_name, desc->ld_magic);
1312                         RETURN(-EINVAL);
1313                 }
1314         }
1315
1316         lod_fix_desc(desc);
1317
1318         desc->ld_active_tgt_count = 0;
1319         lod->lod_desc = *desc;
1320
1321         lod->lod_sp_me = LUSTRE_SP_CLI;
1322
1323         /* Set up allocation policy (QoS and RR) */
1324         INIT_LIST_HEAD(&lod->lod_qos.lq_oss_list);
1325         init_rwsem(&lod->lod_qos.lq_rw_sem);
1326         lod->lod_qos.lq_dirty = 1;
1327         lod->lod_qos.lq_rr.lqr_dirty = 1;
1328         lod->lod_qos.lq_reset = 1;
1329         /* Default priority is toward free space balance */
1330         lod->lod_qos.lq_prio_free = 232;
1331         /* Default threshold for rr (roughly 17%) */
1332         lod->lod_qos.lq_threshold_rr = 43;
1333
1334         /* Set up OST pool environment */
1335         lod->lod_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
1336                                                    HASH_POOLS_MAX_BITS,
1337                                                    HASH_POOLS_BKT_BITS, 0,
1338                                                    CFS_HASH_MIN_THETA,
1339                                                    CFS_HASH_MAX_THETA,
1340                                                    &pool_hash_operations,
1341                                                    CFS_HASH_DEFAULT);
1342         if (lod->lod_pools_hash_body == NULL)
1343                 RETURN(-ENOMEM);
1344
1345         INIT_LIST_HEAD(&lod->lod_pool_list);
1346         lod->lod_pool_count = 0;
1347         rc = lod_ost_pool_init(&lod->lod_pool_info, 0);
1348         if (rc)
1349                 GOTO(out_hash, rc);
1350         lod_qos_rr_init(&lod->lod_qos.lq_rr);
1351         rc = lod_ost_pool_init(&lod->lod_qos.lq_rr.lqr_pool, 0);
1352         if (rc)
1353                 GOTO(out_pool_info, rc);
1354
1355         RETURN(0);
1356
1357 out_pool_info:
1358         lod_ost_pool_free(&lod->lod_pool_info);
1359 out_hash:
1360         cfs_hash_putref(lod->lod_pools_hash_body);
1361
1362         return rc;
1363 }
1364
1365 /**
1366  * Release the structures describing the pools.
1367  *
1368  * \param[in] lod       LOD device from which we release the structures
1369  *
1370  * \retval              0 always
1371  */
1372 int lod_pools_fini(struct lod_device *lod)
1373 {
1374         struct obd_device   *obd = lod2obd(lod);
1375         struct pool_desc    *pool, *tmp;
1376         ENTRY;
1377
1378         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
1379                 /* free pool structs */
1380                 CDEBUG(D_INFO, "delete pool %p\n", pool);
1381                 /* In the function below, .hs_keycmp resolves to
1382                  * pool_hashkey_keycmp() */
1383                 /* coverity[overrun-buffer-val] */
1384                 lod_pool_del(obd, pool->pool_name);
1385         }
1386
1387         cfs_hash_putref(lod->lod_pools_hash_body);
1388         lod_ost_pool_free(&(lod->lod_qos.lq_rr.lqr_pool));
1389         lod_ost_pool_free(&lod->lod_pool_info);
1390
1391         RETURN(0);
1392 }