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, 2016, 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         struct cfs_bitmap *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 static void lod_free_comp_buffer(struct lod_layout_component *entries,
 621                                  __u16 count, __u32 bufsize)
 622 {
 623         struct lod_layout_component *entry;
 624         int i;
 625
 626         for (i = 0; i < count; i++) {
 627                 entry = &entries[i];
 628                 if (entry->llc_pool != NULL)
 629                         lod_set_pool(&entry->llc_pool, NULL);
 630                 if (entry->llc_ostlist.op_array)
 631                         OBD_FREE(entry->llc_ostlist.op_array,
 632                                  entry->llc_ostlist.op_size);
 633                 LASSERT(entry->llc_stripe == NULL);
 634                 LASSERT(entry->llc_stripes_allocated == 0);
 635         }
 636
 637         if (bufsize != 0)
 638                 OBD_FREE_LARGE(entries, bufsize);
 639 }
 640
 641 void lod_free_def_comp_entries(struct lod_default_striping *lds)
 642 {
 643         lod_free_comp_buffer(lds->lds_def_comp_entries,
 644                              lds->lds_def_comp_size_cnt,
 645                              size_roundup_power2(
 646                                      sizeof(*lds->lds_def_comp_entries) *
 647                                      lds->lds_def_comp_size_cnt));
 648         lds->lds_def_comp_entries = NULL;
 649         lds->lds_def_comp_cnt = 0;
 650         lds->lds_def_striping_is_composite = 0;
 651         lds->lds_def_comp_size_cnt = 0;
 652 }
 653
 654 /**
 655  * Resize per-thread storage to hold default striping component entries
 656  *
 657  * A helper function to resize per-thread temporary storage. This storage
 658  * is used to hold default LOV/LVM EAs and may be quite large. We do not want
 659  * to allocate/release it every time, so instead we put it into the env and
 660  * reallocate it on demand. The memory is released when the correspondent
 661  * thread is finished.
 662  *
 663  * \param[in,out] lds           default striping
 664  * \param[in] count             new component count to grow the buffer to
 665
 666  * \retval                      0 on success, -ENOMEM if reallocation failed
 667  */
 668 int lod_def_striping_comp_resize(struct lod_default_striping *lds, __u16 count)
 669 {
 670         struct lod_layout_component *entries;
 671         __u32 new = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
 672                                         count);
 673         __u32 old = size_roundup_power2(sizeof(*lds->lds_def_comp_entries) *
 674                                         lds->lds_def_comp_size_cnt);
 675
 676         if (new <= old)
 677                 return 0;
 678
 679         OBD_ALLOC_LARGE(entries, new);
 680         if (entries == NULL)
 681                 return -ENOMEM;
 682
 683         if (lds->lds_def_comp_entries != NULL) {
 684                 CDEBUG(D_INFO, "default striping component size %d is not "
 685                        "enough, need %d\n", old, new);
 686                 lod_free_def_comp_entries(lds);
 687         }
 688
 689         lds->lds_def_comp_entries = entries;
 690         lds->lds_def_comp_size_cnt = count;
 691
 692         RETURN(0);
 693 }
 694
 695 void lod_free_comp_entries(struct lod_object *lo)
 696 {
 697         lod_free_comp_buffer(lo->ldo_comp_entries,
 698                              lo->ldo_comp_cnt,
 699                              sizeof(*lo->ldo_comp_entries) * lo->ldo_comp_cnt);
 700         lo->ldo_comp_entries = NULL;
 701         lo->ldo_comp_cnt = 0;
 702         lo->ldo_is_composite = 0;
 703 }
 704
 705 int lod_alloc_comp_entries(struct lod_object *lo, int cnt)
 706 {
 707         LASSERT(cnt != 0);
 708         LASSERT(lo->ldo_comp_cnt == 0 && lo->ldo_comp_entries == NULL);
 709
 710         OBD_ALLOC_LARGE(lo->ldo_comp_entries,
 711                         sizeof(*lo->ldo_comp_entries) * cnt);
 712         if (lo->ldo_comp_entries == NULL)
 713                 return -ENOMEM;
 714         lo->ldo_comp_cnt = cnt;
 715         return 0;
 716 }
 717
 718 /**
 719  * Generate on-disk lov_mds_md structure for each layout component based on
 720  * the information in lod_object->ldo_comp_entries[i].
 721  *
 722  * \param[in] env               execution environment for this thread
 723  * \param[in] lo                LOD object
 724  * \param[in] comp_idx          index of ldo_comp_entries
 725  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 726  * \param[in|out] lmm_size      buffer size/lmm size
 727  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 728  *                              the stripe info is from the default stripe
 729  *                              template, which is collected in lod_ah_init(),
 730  *                              either from parent object or root object; for
 731  *                              file case, it's from the @lo object
 732  *
 733  * \retval                      0 if on disk structure is created successfully
 734  * \retval                      negative error number on failure
 735  */
 736 static int lod_gen_component_ea(const struct lu_env *env,
 737                                 struct lod_object *lo, int comp_idx,
 738                                 struct lov_mds_md *lmm, int *lmm_size,
 739                                 bool is_dir)
 740 {
 741         struct lod_thread_info  *info = lod_env_info(env);
 742         const struct lu_fid     *fid  = lu_object_fid(&lo->ldo_obj.do_lu);
 743         struct lod_device       *lod;
 744         struct lov_ost_data_v1  *objs;
 745         struct lod_layout_component *lod_comp;
 746         __u32   magic;
 747         __u16 stripecnt;
 748         int     i, rc = 0;
 749         ENTRY;
 750
 751         LASSERT(lo);
 752         if (is_dir)
 753                 lod_comp =
 754                         &lo->ldo_def_striping->lds_def_comp_entries[comp_idx];
 755         else
 756                 lod_comp = &lo->ldo_comp_entries[comp_idx];
 757
 758         magic = lod_comp->llc_pool != NULL ? LOV_MAGIC_V3 : LOV_MAGIC_V1;
 759         if (lod_comp->llc_pattern == 0) /* default striping */
 760                 lod_comp->llc_pattern = LOV_PATTERN_RAID0;
 761
 762         lmm->lmm_magic = cpu_to_le32(magic);
 763         lmm->lmm_pattern = cpu_to_le32(lod_comp->llc_pattern);
 764         fid_to_lmm_oi(fid, &lmm->lmm_oi);
 765         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_LMMOI))
 766                 lmm->lmm_oi.oi.oi_id++;
 767         lmm_oi_cpu_to_le(&lmm->lmm_oi, &lmm->lmm_oi);
 768
 769         lmm->lmm_stripe_size = cpu_to_le32(lod_comp->llc_stripe_size);
 770         lmm->lmm_stripe_count = cpu_to_le16(lod_comp->llc_stripenr);
 771         /**
 772          * for dir and uninstantiated component, lmm_layout_gen stores
 773          * default stripe offset.
 774          */
 775         lmm->lmm_layout_gen =
 776                 (is_dir || !lod_comp_inited(lod_comp)) ?
 777                         cpu_to_le16(lod_comp->llc_stripe_offset) :
 778                         cpu_to_le16(lod_comp->llc_layout_gen);
 779
 780         if (magic == LOV_MAGIC_V1) {
 781                 objs = &lmm->lmm_objects[0];
 782         } else {
 783                 struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
 784                 size_t cplen = strlcpy(v3->lmm_pool_name,
 785                                        lod_comp->llc_pool,
 786                                        sizeof(v3->lmm_pool_name));
 787                 if (cplen >= sizeof(v3->lmm_pool_name))
 788                         RETURN(-E2BIG);
 789                 objs = &v3->lmm_objects[0];
 790         }
 791         stripecnt = lod_comp_entry_stripecnt(lo, lod_comp, is_dir);
 792
 793         if (is_dir || lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED)
 794                 GOTO(done, rc = 0);
 795
 796         /* generate ost_idx of this component stripe */
 797         lod = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
 798         for (i = 0; i < stripecnt; i++) {
 799                 struct dt_object *object;
 800                 __u32 ost_idx = (__u32)-1UL;
 801                 int type = LU_SEQ_RANGE_OST;
 802
 803                 if (lod_comp->llc_stripe && lod_comp->llc_stripe[i]) {
 804                         object = lod_comp->llc_stripe[i];
 805                         /* instantiated component */
 806                         info->lti_fid = *lu_object_fid(&object->do_lu);
 807
 808                         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_MULTIPLE_REF) &&
 809                             comp_idx == 0) {
 810                                 if (cfs_fail_val == 0)
 811                                         cfs_fail_val = info->lti_fid.f_oid;
 812                                 else if (i == 0)
 813                                         info->lti_fid.f_oid = cfs_fail_val;
 814                         }
 815
 816                         rc = fid_to_ostid(&info->lti_fid, &info->lti_ostid);
 817                         LASSERT(rc == 0);
 818
 819                         ostid_cpu_to_le(&info->lti_ostid, &objs[i].l_ost_oi);
 820                         objs[i].l_ost_gen = cpu_to_le32(0);
 821                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FLD_LOOKUP))
 822                                 rc = -ENOENT;
 823                         else
 824                                 rc = lod_fld_lookup(env, lod, &info->lti_fid,
 825                                                     &ost_idx, &type);
 826                         if (rc < 0) {
 827                                 CERROR("%s: Can not locate "DFID": rc = %d\n",
 828                                        lod2obd(lod)->obd_name,
 829                                        PFID(&info->lti_fid), rc);
 830                                 RETURN(rc);
 831                         }
 832                 } else if (lod_comp->llc_ostlist.op_array) {
 833                         /* user specified ost list */
 834                         ost_idx = lod_comp->llc_ostlist.op_array[i];
 835                 }
 836                 /*
 837                  * with un-instantiated or with no specified ost list
 838                  * component, its l_ost_idx does not matter.
 839                  */
 840                 objs[i].l_ost_idx = cpu_to_le32(ost_idx);
 841         }
 842 done:
 843         if (lmm_size != NULL)
 844                 *lmm_size = lov_mds_md_size(stripecnt, magic);
 845         RETURN(rc);
 846 }
 847
 848 /**
 849  * Generate component ID for new created component.
 850  *
 851  * \param[in] lo                LOD object
 852  * \param[in] comp_idx          index of ldo_comp_entries
 853  *
 854  * \retval                      component ID on success
 855  * \retval                      LCME_ID_INVAL on failure
 856  */
 857 static __u32 lod_gen_component_id(struct lod_object *lo, int comp_idx)
 858 {
 859         struct lod_layout_component *lod_comp;
 860         __u32   id, start, end;
 861         int     i;
 862
 863         LASSERT(lo->ldo_comp_entries[comp_idx].llc_id == LCME_ID_INVAL);
 864
 865         lod_obj_inc_layout_gen(lo);
 866         id = lo->ldo_layout_gen;
 867         if (likely(id <= LCME_ID_MAX))
 868                 return id;
 869
 870         /* Layout generation wraps, need to check collisions. */
 871         start = id & LCME_ID_MASK;
 872         end = (__u32)LCME_ID_MAX + 1;
 873 again:
 874         for (id = start; id < end; id++) {
 875                 for (i = 0; i < lo->ldo_comp_cnt; i++) {
 876                         lod_comp = &lo->ldo_comp_entries[i];
 877                         if (id == lod_comp->llc_id)
 878                                 break;
 879                 }
 880                 /* Found the ununsed ID */
 881                 if (i == lo->ldo_comp_cnt)
 882                         return id;
 883         }
 884         if (end == (__u32)LCME_ID_MAX + 1) {
 885                 start = 0;
 886                 end = lo->ldo_layout_gen & LCME_ID_MASK;
 887                 goto again;
 888         }
 889
 890         return LCME_ID_INVAL;
 891 }
 892
 893 /**
 894  * Generate on-disk lov_mds_md structure based on the information in
 895  * the lod_object->ldo_comp_entries.
 896  *
 897  * \param[in] env               execution environment for this thread
 898  * \param[in] lo                LOD object
 899  * \param[in] lmm               buffer to cotain the on-disk lov_mds_md
 900  * \param[in|out] lmm_size      buffer size/lmm size
 901  * \param[in] is_dir            generate lov ea for dir or file? For dir case,
 902  *                              the stripe info is from the default stripe
 903  *                              template, which is collected in lod_ah_init(),
 904  *                              either from parent object or root object; for
 905  *                              file case, it's from the @lo object
 906  *
 907  * \retval                      0 if on disk structure is created successfully
 908  * \retval                      negative error number on failure
 909  */
 910 int lod_generate_lovea(const struct lu_env *env, struct lod_object *lo,
 911                        struct lov_mds_md *lmm, int *lmm_size, bool is_dir)
 912 {
 913         struct lov_comp_md_entry_v1 *lcme;
 914         struct lov_comp_md_v1 *lcm;
 915         struct lod_layout_component *comp_entries;
 916         __u16 comp_cnt;
 917         bool is_composite;
 918         int i, rc = 0, offset;
 919         ENTRY;
 920
 921         if (is_dir) {
 922                 comp_cnt = lo->ldo_def_striping->lds_def_comp_cnt;
 923                 comp_entries = lo->ldo_def_striping->lds_def_comp_entries;
 924                 is_composite =
 925                         lo->ldo_def_striping->lds_def_striping_is_composite;
 926         } else {
 927                 comp_cnt = lo->ldo_comp_cnt;
 928                 comp_entries = lo->ldo_comp_entries;
 929                 is_composite = lo->ldo_is_composite;
 930         }
 931
 932         LASSERT(lmm_size != NULL);
 933         LASSERT(comp_cnt != 0 && comp_entries != NULL);
 934
 935         if (!is_composite) {
 936                 rc = lod_gen_component_ea(env, lo, 0, lmm, lmm_size, is_dir);
 937                 RETURN(rc);
 938         }
 939
 940         lcm = (struct lov_comp_md_v1 *)lmm;
 941         lcm->lcm_magic = cpu_to_le32(LOV_MAGIC_COMP_V1);
 942         lcm->lcm_entry_count = cpu_to_le16(comp_cnt);
 943
 944         offset = sizeof(*lcm) + sizeof(*lcme) * comp_cnt;
 945         LASSERT(offset % sizeof(__u64) == 0);
 946
 947         for (i = 0; i < comp_cnt; i++) {
 948                 struct lod_layout_component *lod_comp;
 949                 struct lov_mds_md *sub_md;
 950                 int size;
 951
 952                 lod_comp = &comp_entries[i];
 953                 lcme = &lcm->lcm_entries[i];
 954
 955                 if (lod_comp->llc_id == LCME_ID_INVAL && !is_dir) {
 956                         lod_comp->llc_id = lod_gen_component_id(lo, i);
 957                         if (lod_comp->llc_id == LCME_ID_INVAL)
 958                                 GOTO(out, rc = -ERANGE);
 959                 }
 960                 lcme->lcme_id = cpu_to_le32(lod_comp->llc_id);
 961
 962                 /* component could be un-inistantiated */
 963                 lcme->lcme_flags = cpu_to_le32(lod_comp->llc_flags);
 964                 lcme->lcme_extent.e_start =
 965                         cpu_to_le64(lod_comp->llc_extent.e_start);
 966                 lcme->lcme_extent.e_end =
 967                         cpu_to_le64(lod_comp->llc_extent.e_end);
 968                 lcme->lcme_offset = cpu_to_le32(offset);
 969
 970                 sub_md = (struct lov_mds_md *)((char *)lcm + offset);
 971                 rc = lod_gen_component_ea(env, lo, i, sub_md, &size, is_dir);
 972                 if (rc)
 973                         GOTO(out, rc);
 974                 lcme->lcme_size = cpu_to_le32(size);
 975                 offset += size;
 976                 LASSERTF((offset <= *lmm_size) && (offset % sizeof(__u64) == 0),
 977                          "offset:%d lmm_size:%d\n", offset, *lmm_size);
 978         }
 979         lcm->lcm_size = cpu_to_le32(offset);
 980         lcm->lcm_layout_gen = cpu_to_le32(is_dir ? 0 : lo->ldo_layout_gen);
 981
 982         lustre_print_user_md(D_LAYOUT, (struct lov_user_md *)lmm,
 983                              "generate lum");
 984 out:
 985         if (rc == 0)
 986                 *lmm_size = offset;
 987         RETURN(rc);
 988 }
 989
 990 /**
 991  * Get LOV EA.
 992  *
 993  * Fill lti_ea_store buffer in the environment with a value for the given
 994  * EA. The buffer is reallocated if the value doesn't fit.
 995  *
 996  * \param[in,out] env           execution environment for this thread
 997  *                              .lti_ea_store buffer is filled with EA's value
 998  * \param[in] lo                LOD object
 999  * \param[in] name              name of the EA
1000  *
1001  * \retval                      > 0 if EA is fetched successfully
1002  * \retval                      0 if EA is empty
1003  * \retval                      negative error number on failure
1004  */
1005 int lod_get_ea(const struct lu_env *env, struct lod_object *lo,
1006                const char *name)
1007 {
1008         struct lod_thread_info  *info = lod_env_info(env);
1009         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
1010         int                     rc;
1011         ENTRY;
1012
1013         LASSERT(info);
1014
1015         if (unlikely(info->lti_ea_store == NULL)) {
1016                 /* just to enter in allocation block below */
1017                 rc = -ERANGE;
1018         } else {
1019 repeat:
1020                 info->lti_buf.lb_buf = info->lti_ea_store;
1021                 info->lti_buf.lb_len = info->lti_ea_store_size;
1022                 rc = dt_xattr_get(env, next, &info->lti_buf, name);
1023         }
1024
1025         /* if object is not striped or inaccessible */
1026         if (rc == -ENODATA || rc == -ENOENT)
1027                 RETURN(0);
1028
1029         if (rc == -ERANGE) {
1030                 /* EA doesn't fit, reallocate new buffer */
1031                 rc = dt_xattr_get(env, next, &LU_BUF_NULL, name);
1032                 if (rc == -ENODATA || rc == -ENOENT)
1033                         RETURN(0);
1034                 else if (rc < 0)
1035                         RETURN(rc);
1036
1037                 LASSERT(rc > 0);
1038                 rc = lod_ea_store_resize(info, rc);
1039                 if (rc)
1040                         RETURN(rc);
1041                 goto repeat;
1042         }
1043
1044         RETURN(rc);
1045 }
1046
1047 /**
1048  * Verify the target index is present in the current configuration.
1049  *
1050  * \param[in] md                LOD device where the target table is stored
1051  * \param[in] idx               target's index
1052  *
1053  * \retval                      0 if the index is present
1054  * \retval                      -EINVAL if not
1055  */
1056 static int validate_lod_and_idx(struct lod_device *md, __u32 idx)
1057 {
1058         if (unlikely(idx >= md->lod_ost_descs.ltd_tgts_size ||
1059                      !cfs_bitmap_check(md->lod_ost_bitmap, idx))) {
1060                 CERROR("%s: bad idx: %d of %d\n", lod2obd(md)->obd_name, idx,
1061                        md->lod_ost_descs.ltd_tgts_size);
1062                 return -EINVAL;
1063         }
1064
1065         if (unlikely(OST_TGT(md, idx) == NULL)) {
1066                 CERROR("%s: bad lod_tgt_desc for idx: %d\n",
1067                        lod2obd(md)->obd_name, idx);
1068                 return -EINVAL;
1069         }
1070
1071         if (unlikely(OST_TGT(md, idx)->ltd_ost == NULL)) {
1072                 CERROR("%s: invalid lod device, for idx: %d\n",
1073                        lod2obd(md)->obd_name , idx);
1074                 return -EINVAL;
1075         }
1076
1077         return 0;
1078 }
1079
1080 /**
1081  * Instantiate objects for stripes.
1082  *
1083  * Allocate and initialize LU-objects representing the stripes. The number
1084  * of the stripes (ldo_stripenr) must be initialized already. The caller
1085  * must ensure nobody else is calling the function on the object at the same
1086  * time. FLDB service must be running to be able to map a FID to the targets
1087  * and find appropriate device representing that target.
1088  *
1089  * \param[in] env               execution environment for this thread
1090  * \param[in,out] lo            LOD object
1091  * \param[in] objs              an array of IDs to creates the objects from
1092  * \param[in] comp_idx          index of ldo_comp_entries
1093  *
1094  * \retval                      0 if the objects are instantiated successfully
1095  * \retval                      negative error number on failure
1096  */
1097 int lod_initialize_objects(const struct lu_env *env, struct lod_object *lo,
1098                            struct lov_ost_data_v1 *objs, int comp_idx)
1099 {
1100         struct lod_layout_component     *lod_comp;
1101         struct lod_thread_info  *info = lod_env_info(env);
1102         struct lod_device       *md;
1103         struct lu_object        *o, *n;
1104         struct lu_device        *nd;
1105         struct dt_object       **stripe;
1106         int                      stripe_len;
1107         int                      i, rc = 0;
1108         __u32                   idx;
1109         ENTRY;
1110
1111         LASSERT(lo != NULL);
1112         md = lu2lod_dev(lo->ldo_obj.do_lu.lo_dev);
1113
1114         LASSERT(lo->ldo_comp_cnt != 0 && lo->ldo_comp_entries != NULL);
1115         lod_comp = &lo->ldo_comp_entries[comp_idx];
1116
1117         LASSERT(lod_comp->llc_stripe == NULL);
1118         LASSERT(lod_comp->llc_stripenr > 0);
1119         LASSERT(lod_comp->llc_stripe_size > 0);
1120
1121         stripe_len = lod_comp->llc_stripenr;
1122         OBD_ALLOC(stripe, sizeof(stripe[0]) * stripe_len);
1123         if (stripe == NULL)
1124                 RETURN(-ENOMEM);
1125
1126         for (i = 0; i < lod_comp->llc_stripenr; i++) {
1127                 if (unlikely(lovea_slot_is_dummy(&objs[i])))
1128                         continue;
1129
1130                 ostid_le_to_cpu(&objs[i].l_ost_oi, &info->lti_ostid);
1131                 idx = le32_to_cpu(objs[i].l_ost_idx);
1132                 rc = ostid_to_fid(&info->lti_fid, &info->lti_ostid, idx);
1133                 if (rc != 0)
1134                         GOTO(out, rc);
1135                 LASSERTF(fid_is_sane(&info->lti_fid), ""DFID" insane!\n",
1136                          PFID(&info->lti_fid));
1137                 lod_getref(&md->lod_ost_descs);
1138
1139                 rc = validate_lod_and_idx(md, idx);
1140                 if (unlikely(rc != 0)) {
1141                         lod_putref(md, &md->lod_ost_descs);
1142                         GOTO(out, rc);
1143                 }
1144
1145                 nd = &OST_TGT(md,idx)->ltd_ost->dd_lu_dev;
1146                 lod_putref(md, &md->lod_ost_descs);
1147
1148                 /* In the function below, .hs_keycmp resolves to
1149                  * u_obj_hop_keycmp() */
1150                 /* coverity[overrun-buffer-val] */
1151                 o = lu_object_find_at(env, nd, &info->lti_fid, NULL);
1152                 if (IS_ERR(o))
1153                         GOTO(out, rc = PTR_ERR(o));
1154
1155                 n = lu_object_locate(o->lo_header, nd->ld_type);
1156                 LASSERT(n);
1157
1158                 stripe[i] = container_of(n, struct dt_object, do_lu);
1159         }
1160
1161 out:
1162         if (rc != 0) {
1163                 for (i = 0; i < stripe_len; i++)
1164                         if (stripe[i] != NULL)
1165                                 dt_object_put(env, stripe[i]);
1166
1167                 OBD_FREE(stripe, sizeof(stripe[0]) * stripe_len);
1168                 lod_comp->llc_stripenr = 0;
1169         } else {
1170                 lod_comp->llc_stripe = stripe;
1171                 lod_comp->llc_stripes_allocated = stripe_len;
1172         }
1173
1174         RETURN(rc);
1175 }
1176
1177 /**
1178  * Instantiate objects for striping.
1179  *
1180  * Parse striping information in \a buf and instantiate the objects
1181  * representing the stripes.
1182  *
1183  * \param[in] env               execution environment for this thread
1184  * \param[in] lo                LOD object
1185  * \param[in] buf               buffer storing LOV EA to parse
1186  *
1187  * \retval                      0 if parsing and objects creation succeed
1188  * \retval                      negative error number on failure
1189  */
1190 int lod_parse_striping(const struct lu_env *env, struct lod_object *lo,
1191                        const struct lu_buf *buf)
1192 {
1193         struct lov_mds_md_v1    *lmm;
1194         struct lov_comp_md_v1   *comp_v1 = NULL;
1195         struct lov_ost_data_v1  *objs;
1196         __u32   magic, pattern;
1197         int     i, j, rc = 0;
1198         __u16   comp_cnt;
1199         ENTRY;
1200
1201         LASSERT(buf);
1202         LASSERT(buf->lb_buf);
1203         LASSERT(buf->lb_len);
1204
1205         lmm = (struct lov_mds_md_v1 *)buf->lb_buf;
1206         magic = le32_to_cpu(lmm->lmm_magic);
1207
1208         if (magic != LOV_MAGIC_V1 && magic != LOV_MAGIC_V3 &&
1209             magic != LOV_MAGIC_COMP_V1)
1210                 GOTO(out, rc = -EINVAL);
1211
1212         lod_free_comp_entries(lo);
1213
1214         if (magic == LOV_MAGIC_COMP_V1) {
1215                 comp_v1 = (struct lov_comp_md_v1 *)lmm;
1216                 comp_cnt = le16_to_cpu(comp_v1->lcm_entry_count);
1217                 if (comp_cnt == 0)
1218                         GOTO(out, rc = -EINVAL);
1219                 lo->ldo_layout_gen = le32_to_cpu(comp_v1->lcm_layout_gen);
1220                 lo->ldo_is_composite = 1;
1221         } else {
1222                 comp_cnt = 1;
1223                 lo->ldo_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1224                 lo->ldo_is_composite = 0;
1225         }
1226
1227         rc = lod_alloc_comp_entries(lo, comp_cnt);
1228         if (rc)
1229                 GOTO(out, rc);
1230
1231         for (i = 0; i < comp_cnt; i++) {
1232                 struct lod_layout_component     *lod_comp;
1233                 struct lu_extent        *ext;
1234                 __u32   offs;
1235
1236                 lod_comp = &lo->ldo_comp_entries[i];
1237                 if (lo->ldo_is_composite) {
1238                         offs = le32_to_cpu(comp_v1->lcm_entries[i].lcme_offset);
1239                         lmm = (struct lov_mds_md_v1 *)((char *)comp_v1 + offs);
1240                         magic = le32_to_cpu(lmm->lmm_magic);
1241
1242                         ext = &comp_v1->lcm_entries[i].lcme_extent;
1243                         lod_comp->llc_extent.e_start =
1244                                 le64_to_cpu(ext->e_start);
1245                         lod_comp->llc_extent.e_end = le64_to_cpu(ext->e_end);
1246                         lod_comp->llc_flags =
1247                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_flags);
1248                         lod_comp->llc_id =
1249                                 le32_to_cpu(comp_v1->lcm_entries[i].lcme_id);
1250                         if (lod_comp->llc_id == LCME_ID_INVAL)
1251                                 GOTO(out, rc = -EINVAL);
1252                 } else {
1253                         lod_comp_set_init(lod_comp);
1254                 }
1255
1256                 pattern = le32_to_cpu(lmm->lmm_pattern);
1257                 if (lov_pattern(pattern) != LOV_PATTERN_RAID0)
1258                         GOTO(out, rc = -EINVAL);
1259
1260                 lod_comp->llc_pattern = pattern;
1261                 lod_comp->llc_stripe_size = le32_to_cpu(lmm->lmm_stripe_size);
1262                 lod_comp->llc_stripenr = le16_to_cpu(lmm->lmm_stripe_count);
1263                 lod_comp->llc_layout_gen = le16_to_cpu(lmm->lmm_layout_gen);
1264
1265                 if (magic == LOV_MAGIC_V3) {
1266                         struct lov_mds_md_v3 *v3 = (struct lov_mds_md_v3 *)lmm;
1267                         objs = &v3->lmm_objects[0];
1268                         /* no need to set pool, which is used in create only */
1269                 } else {
1270                         objs = &lmm->lmm_objects[0];
1271                 }
1272
1273                 /**
1274                  * If uninstantiated template component has valid l_ost_idx,
1275                  * then use has specified ost list for this component.
1276                  */
1277                 if (!lod_comp_inited(lod_comp) &&
1278                     objs[0].l_ost_idx != (__u32)-1UL) {
1279                         /**
1280                          * load the user specified ost list, when this
1281                          * component is instantiated later, it will be used
1282                          * in lod_alloc_ost_list().
1283                          */
1284                         lod_comp->llc_ostlist.op_count = lod_comp->llc_stripenr;
1285                         lod_comp->llc_ostlist.op_size =
1286                                         lod_comp->llc_stripenr * sizeof(__u32);
1287                         OBD_ALLOC(lod_comp->llc_ostlist.op_array,
1288                                   lod_comp->llc_ostlist.op_size);
1289                         if (!lod_comp->llc_ostlist.op_array)
1290                                 GOTO(out, rc = -ENOMEM);
1291
1292                         for (j = 0; j < lod_comp->llc_stripenr; j++)
1293                                 lod_comp->llc_ostlist.op_array[j] =
1294                                                 le32_to_cpu(objs[j].l_ost_idx);
1295                 }
1296
1297                 /* skip un-instantiated component object initialization */
1298                 if (!lod_comp_inited(lod_comp))
1299                         continue;
1300
1301                 if (!(lod_comp->llc_pattern & LOV_PATTERN_F_RELEASED)) {
1302                         rc = lod_initialize_objects(env, lo, objs, i);
1303                         if (rc)
1304                                 GOTO(out, rc);
1305                 }
1306         }
1307 out:
1308         if (rc)
1309                 lod_object_free_striping(env, lo);
1310         RETURN(rc);
1311 }
1312
1313 /**
1314  * Check whether the striping (LOVEA for regular file, LMVEA for directory)
1315  * is already cached.
1316  *
1317  * \param[in] lo        LOD object
1318  *
1319  * \retval              True if the striping is cached, otherwise
1320  *                      return false.
1321  */
1322 static bool lod_striping_loaded(struct lod_object *lo)
1323 {
1324         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr) &&
1325             lo->ldo_comp_cached)
1326                 return true;
1327
1328         if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1329                 if (lo->ldo_stripe != NULL)
1330                         return true;
1331
1332                 /* Never load LMV stripe for slaves of striped dir */
1333                 if (lo->ldo_dir_slave_stripe)
1334                         return true;
1335         }
1336
1337         return false;
1338 }
1339
1340 /**
1341  * Initialize the object representing the stripes.
1342  *
1343  * Unless the stripes are initialized already, fetch LOV (for regular
1344  * objects) or LMV (for directory objects) EA and call lod_parse_striping()
1345  * to instantiate the objects representing the stripes. Caller should
1346  * hold the dt_write_lock(next).
1347  *
1348  * \param[in] env               execution environment for this thread
1349  * \param[in,out] lo            LOD object
1350  *
1351  * \retval                      0 if parsing and object creation succeed
1352  * \retval                      negative error number on failure
1353  */
1354 int lod_load_striping_locked(const struct lu_env *env, struct lod_object *lo)
1355 {
1356         struct lod_thread_info  *info = lod_env_info(env);
1357         struct lu_buf           *buf  = &info->lti_buf;
1358         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
1359         int                      rc = 0;
1360         ENTRY;
1361
1362         if (!dt_object_exists(next))
1363                 GOTO(out, rc = 0);
1364
1365         if (lod_striping_loaded(lo))
1366                 GOTO(out, rc = 0);
1367
1368         if (S_ISREG(lod2lu_obj(lo)->lo_header->loh_attr)) {
1369                 rc = lod_get_lov_ea(env, lo);
1370                 if (rc <= 0)
1371                         GOTO(out, rc);
1372                 /*
1373                  * there is LOV EA (striping information) in this object
1374                  * let's parse it and create in-core objects for the stripes
1375                  */
1376                 buf->lb_buf = info->lti_ea_store;
1377                 buf->lb_len = info->lti_ea_store_size;
1378                 rc = lod_parse_striping(env, lo, buf);
1379                 if (rc == 0)
1380                         lo->ldo_comp_cached = 1;
1381         } else if (S_ISDIR(lod2lu_obj(lo)->lo_header->loh_attr)) {
1382                 rc = lod_get_lmv_ea(env, lo);
1383                 if (rc < (typeof(rc))sizeof(struct lmv_mds_md_v1))
1384                         GOTO(out, rc = rc > 0 ? -EINVAL : rc);
1385
1386                 buf->lb_buf = info->lti_ea_store;
1387                 buf->lb_len = info->lti_ea_store_size;
1388                 if (rc == sizeof(struct lmv_mds_md_v1)) {
1389                         rc = lod_load_lmv_shards(env, lo, buf, true);
1390                         if (buf->lb_buf != info->lti_ea_store) {
1391                                 OBD_FREE_LARGE(info->lti_ea_store,
1392                                                info->lti_ea_store_size);
1393                                 info->lti_ea_store = buf->lb_buf;
1394                                 info->lti_ea_store_size = buf->lb_len;
1395                         }
1396
1397                         if (rc < 0)
1398                                 GOTO(out, rc);
1399                 }
1400
1401                 /*
1402                  * there is LMV EA (striping information) in this object
1403                  * let's parse it and create in-core objects for the stripes
1404                  */
1405                 rc = lod_parse_dir_striping(env, lo, buf);
1406         }
1407 out:
1408         RETURN(rc);
1409 }
1410
1411 /**
1412  * A generic function to initialize the stripe objects.
1413  *
1414  * A protected version of lod_load_striping_locked() - load the striping
1415  * information from storage, parse that and instantiate LU objects to
1416  * represent the stripes.  The LOD object \a lo supplies a pointer to the
1417  * next sub-object in the LU stack so we can lock it. Also use \a lo to
1418  * return an array of references to the newly instantiated objects.
1419  *
1420  * \param[in] env               execution environment for this thread
1421  * \param[in,out] lo            LOD object, where striping is stored and
1422  *                              which gets an array of references
1423  *
1424  * \retval                      0 if parsing and object creation succeed
1425  * \retval                      negative error number on failure
1426  **/
1427 int lod_load_striping(const struct lu_env *env, struct lod_object *lo)
1428 {
1429         struct dt_object        *next = dt_object_child(&lo->ldo_obj);
1430         int                     rc;
1431
1432         if (!dt_object_exists(next))
1433                 return 0;
1434
1435         /* Check without locking first */
1436         if (lod_striping_loaded(lo))
1437                 return 0;
1438
1439         /* currently this code is supposed to be called from declaration
1440          * phase only, thus the object is not expected to be locked by caller */
1441         dt_write_lock(env, next, 0);
1442         rc = lod_load_striping_locked(env, lo);
1443         dt_write_unlock(env, next);
1444         return rc;
1445 }
1446
1447 /**
1448  * Verify lov_user_md_v1/v3 striping.
1449  *
1450  * Check the validity of all fields including the magic, stripe size,
1451  * stripe count, stripe offset and that the pool is present.  Also check
1452  * that each target index points to an existing target. The additional
1453  * \a is_from_disk turns additional checks. In some cases zero fields
1454  * are allowed (like pattern=0).
1455  *
1456  * \param[in] d                 LOD device
1457  * \param[in] buf               buffer with LOV EA to verify
1458  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1459  *                              1 - from disk, do not allow
1460  *
1461  * \retval                      0 if the striping is valid
1462  * \retval                      -EINVAL if striping is invalid
1463  */
1464 static int lod_verify_v1v3(struct lod_device *d, const struct lu_buf *buf,
1465                            bool is_from_disk)
1466 {
1467         struct lov_user_md_v1   *lum;
1468         struct lov_user_md_v3   *lum3;
1469         struct pool_desc        *pool = NULL;
1470         __u32                    magic;
1471         __u32                    stripe_size;
1472         __u16                    stripe_count;
1473         __u16                    stripe_offset;
1474         size_t                   lum_size;
1475         int                      rc = 0;
1476         ENTRY;
1477
1478         lum = buf->lb_buf;
1479
1480         if (buf->lb_len < sizeof(*lum)) {
1481                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1482                        buf->lb_len);
1483                 GOTO(out, rc = -EINVAL);
1484         }
1485
1486         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEF;
1487         if (magic != LOV_USER_MAGIC_V1 &&
1488             magic != LOV_USER_MAGIC_V3 &&
1489             magic != LOV_USER_MAGIC_SPECIFIC) {
1490                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1491                        le32_to_cpu(lum->lmm_magic));
1492                 GOTO(out, rc = -EINVAL);
1493         }
1494
1495         /* the user uses "0" for default stripe pattern normally. */
1496         if (!is_from_disk && lum->lmm_pattern == 0)
1497                 lum->lmm_pattern = cpu_to_le32(LOV_PATTERN_RAID0);
1498
1499         if (!lov_pattern_supported(le32_to_cpu(lum->lmm_pattern))) {
1500                 CDEBUG(D_LAYOUT, "bad userland stripe pattern: %#x\n",
1501                        le32_to_cpu(lum->lmm_pattern));
1502                 GOTO(out, rc = -EINVAL);
1503         }
1504
1505         /* a released lum comes from creating orphan on hsm release,
1506          * doesn't make sense to verify it. */
1507         if (le32_to_cpu(lum->lmm_pattern) & LOV_PATTERN_F_RELEASED)
1508                 GOTO(out, rc = 0);
1509
1510         /* 64kB is the largest common page size we see (ia64), and matches the
1511          * check in lfs */
1512         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1513         if (stripe_size & (LOV_MIN_STRIPE_SIZE - 1)) {
1514                 CDEBUG(D_LAYOUT, "stripe size %u not a multiple of %u\n",
1515                        stripe_size, LOV_MIN_STRIPE_SIZE);
1516                 GOTO(out, rc = -EINVAL);
1517         }
1518
1519         stripe_offset = le16_to_cpu(lum->lmm_stripe_offset);
1520         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT) {
1521                 /* if offset is not within valid range [0, osts_size) */
1522                 if (stripe_offset >= d->lod_osts_size) {
1523                         CDEBUG(D_LAYOUT, "stripe offset %u >= bitmap size %u\n",
1524                                stripe_offset, d->lod_osts_size);
1525                         GOTO(out, rc = -EINVAL);
1526                 }
1527
1528                 /* if lmm_stripe_offset is *not* in bitmap */
1529                 if (!cfs_bitmap_check(d->lod_ost_bitmap, stripe_offset)) {
1530                         CDEBUG(D_LAYOUT, "stripe offset %u not in bitmap\n",
1531                                stripe_offset);
1532                         GOTO(out, rc = -EINVAL);
1533                 }
1534         }
1535
1536         if (magic == LOV_USER_MAGIC_V1)
1537                 lum_size = offsetof(struct lov_user_md_v1,
1538                                     lmm_objects[0]);
1539         else if (magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC)
1540                 lum_size = offsetof(struct lov_user_md_v3,
1541                                     lmm_objects[0]);
1542         else
1543                 GOTO(out, rc = -EINVAL);
1544
1545         stripe_count = le16_to_cpu(lum->lmm_stripe_count);
1546         if (buf->lb_len < lum_size) {
1547                 CDEBUG(D_LAYOUT, "invalid buf len %zu/%zu for lov_user_md with "
1548                        "magic %#x and stripe_count %u\n",
1549                        buf->lb_len, lum_size, magic, stripe_count);
1550                 GOTO(out, rc = -EINVAL);
1551         }
1552
1553         if (!(magic == LOV_USER_MAGIC_V3 || magic == LOV_USER_MAGIC_SPECIFIC))
1554                 goto out;
1555
1556         lum3 = buf->lb_buf;
1557         /* In the function below, .hs_keycmp resolves to
1558          * pool_hashkey_keycmp() */
1559         /* coverity[overrun-buffer-val] */
1560         pool = lod_find_pool(d, lum3->lmm_pool_name);
1561         if (pool == NULL)
1562                 goto out;
1563
1564         if (!is_from_disk && stripe_offset != LOV_OFFSET_DEFAULT) {
1565                 rc = lod_check_index_in_pool(stripe_offset, pool);
1566                 if (rc < 0)
1567                         GOTO(out, rc = -EINVAL);
1568         }
1569
1570         if (is_from_disk && stripe_count > pool_tgt_count(pool)) {
1571                 CDEBUG(D_LAYOUT, "stripe count %u > # OSTs %u in the pool\n",
1572                        stripe_count, pool_tgt_count(pool));
1573                 GOTO(out, rc = -EINVAL);
1574         }
1575
1576 out:
1577         if (pool != NULL)
1578                 lod_pool_putref(pool);
1579
1580         RETURN(rc);
1581 }
1582
1583 /**
1584  * Verify LOV striping.
1585  *
1586  * \param[in] d                 LOD device
1587  * \param[in] buf               buffer with LOV EA to verify
1588  * \param[in] is_from_disk      0 - from user, allow some fields to be 0
1589  *                              1 - from disk, do not allow
1590  * \param[in] start             extent start for composite layout
1591  *
1592  * \retval                      0 if the striping is valid
1593  * \retval                      -EINVAL if striping is invalid
1594  */
1595 int lod_verify_striping(struct lod_device *d, const struct lu_buf *buf,
1596                         bool is_from_disk, __u64 start)
1597 {
1598         struct lov_user_md_v1   *lum;
1599         struct lov_comp_md_v1   *comp_v1;
1600         __u32   magic;
1601         int     rc = 0, i;
1602         ENTRY;
1603
1604         lum = buf->lb_buf;
1605
1606         if (buf->lb_len < sizeof(*lum)) {
1607                 CDEBUG(D_LAYOUT, "buf len %zu too small for lov_user_md\n",
1608                        buf->lb_len);
1609                 RETURN(-EINVAL);
1610         }
1611
1612         magic = le32_to_cpu(lum->lmm_magic) & ~LOV_MAGIC_DEF;
1613         if (magic != LOV_USER_MAGIC_V1 &&
1614             magic != LOV_USER_MAGIC_V3 &&
1615             magic != LOV_USER_MAGIC_SPECIFIC &&
1616             magic != LOV_USER_MAGIC_COMP_V1) {
1617                 CDEBUG(D_LAYOUT, "bad userland LOV MAGIC: %#x\n",
1618                        le32_to_cpu(lum->lmm_magic));
1619                 RETURN(-EINVAL);
1620         }
1621
1622         if (magic == LOV_USER_MAGIC_COMP_V1) {
1623                 struct lov_comp_md_entry_v1     *ent;
1624                 struct lu_extent        *ext;
1625                 struct lov_desc *desc = &d->lod_desc;
1626                 struct lu_buf   tmp;
1627                 __u32   stripe_size = 0;
1628                 __u64   prev_end = start;
1629
1630                 comp_v1 = buf->lb_buf;
1631                 if (buf->lb_len < le32_to_cpu(comp_v1->lcm_size)) {
1632                         CDEBUG(D_LAYOUT, "buf len %zu is less than %u\n",
1633                                buf->lb_len, le32_to_cpu(comp_v1->lcm_size));
1634                         RETURN(-EINVAL);
1635                 }
1636
1637                 if (le32_to_cpu(comp_v1->lcm_entry_count) == 0) {
1638                         CDEBUG(D_LAYOUT, "entry count is zero\n");
1639                         RETURN(-EINVAL);
1640                 }
1641
1642                 for (i = 0; i < le32_to_cpu(comp_v1->lcm_entry_count); i++) {
1643                         ent = &comp_v1->lcm_entries[i];
1644                         ext = &ent->lcme_extent;
1645
1646                         if (is_from_disk &&
1647                             (le32_to_cpu(ent->lcme_id) == 0 ||
1648                              le32_to_cpu(ent->lcme_id) > LCME_ID_MAX)) {
1649                                 CDEBUG(D_LAYOUT, "invalid id %u\n",
1650                                        le32_to_cpu(ent->lcme_id));
1651                                 RETURN(-EINVAL);
1652                         }
1653
1654                         if (le64_to_cpu(ext->e_start) >=
1655                             le64_to_cpu(ext->e_end)) {
1656                                 CDEBUG(D_LAYOUT, "invalid extent "
1657                                        "[%llu, %llu)\n",
1658                                        le64_to_cpu(ext->e_start),
1659                                        le64_to_cpu(ext->e_end));
1660                                 RETURN(-EINVAL);
1661                         }
1662
1663                         /* first component must start with 0, and the next
1664                          * must be adjacent with the previous one */
1665                         if (le64_to_cpu(ext->e_start) != prev_end) {
1666                                 CDEBUG(D_LAYOUT, "invalid start "
1667                                        "actual:%llu, expect:%llu\n",
1668                                        le64_to_cpu(ext->e_start), prev_end);
1669                                 RETURN(-EINVAL);
1670                         }
1671                         prev_end = le64_to_cpu(ext->e_end);
1672
1673                         tmp.lb_buf = (char *)comp_v1 +
1674                                      le32_to_cpu(ent->lcme_offset);
1675                         tmp.lb_len = le32_to_cpu(ent->lcme_size);
1676                         rc = lod_verify_v1v3(d, &tmp, is_from_disk);
1677                         if (rc)
1678                                 break;
1679
1680                         lum = tmp.lb_buf;
1681
1682                         /* extent end must be aligned with the stripe_size */
1683                         stripe_size = le32_to_cpu(lum->lmm_stripe_size);
1684                         if (stripe_size == 0)
1685                                 stripe_size = desc->ld_default_stripe_size;
1686                         if (stripe_size == 0 ||
1687                             (prev_end != LUSTRE_EOF &&
1688                              (prev_end & (stripe_size - 1)))) {
1689                                 CDEBUG(D_LAYOUT, "stripe size isn't aligned. "
1690                                        " stripe_sz: %u, [%llu, %llu)\n",
1691                                        stripe_size, ext->e_start, prev_end);
1692                                 RETURN(-EINVAL);
1693                         }
1694                 }
1695         } else {
1696                 rc = lod_verify_v1v3(d, buf, is_from_disk);
1697         }
1698
1699         RETURN(rc);
1700 }
1701
1702 void lod_fix_desc_stripe_size(__u64 *val)
1703 {
1704         if (*val < LOV_MIN_STRIPE_SIZE) {
1705                 if (*val != 0)
1706                         LCONSOLE_INFO("Increasing default stripe size to "
1707                                       "minimum value %u\n",
1708                                       LOV_DESC_STRIPE_SIZE_DEFAULT);
1709                 *val = LOV_DESC_STRIPE_SIZE_DEFAULT;
1710         } else if (*val & (LOV_MIN_STRIPE_SIZE - 1)) {
1711                 *val &= ~(LOV_MIN_STRIPE_SIZE - 1);
1712                 LCONSOLE_WARN("Changing default stripe size to %llu (a "
1713                               "multiple of %u)\n",
1714                               *val, LOV_MIN_STRIPE_SIZE);
1715         }
1716 }
1717
1718 void lod_fix_desc_stripe_count(__u32 *val)
1719 {
1720         if (*val == 0)
1721                 *val = 1;
1722 }
1723
1724 void lod_fix_desc_pattern(__u32 *val)
1725 {
1726         /* from lov_setstripe */
1727         if ((*val != 0) && (*val != LOV_PATTERN_RAID0)) {
1728                 LCONSOLE_WARN("Unknown stripe pattern: %#x\n", *val);
1729                 *val = 0;
1730         }
1731 }
1732
1733 void lod_fix_desc_qos_maxage(__u32 *val)
1734 {
1735         /* fix qos_maxage */
1736         if (*val == 0)
1737                 *val = LOV_DESC_QOS_MAXAGE_DEFAULT;
1738 }
1739
1740 /**
1741  * Used to fix insane default striping.
1742  *
1743  * \param[in] desc      striping description
1744  */
1745 void lod_fix_desc(struct lov_desc *desc)
1746 {
1747         lod_fix_desc_stripe_size(&desc->ld_default_stripe_size);
1748         lod_fix_desc_stripe_count(&desc->ld_default_stripe_count);
1749         lod_fix_desc_pattern(&desc->ld_pattern);
1750         lod_fix_desc_qos_maxage(&desc->ld_qos_maxage);
1751 }
1752
1753 /**
1754  * Initialize the structures used to store pools and default striping.
1755  *
1756  * \param[in] lod       LOD device
1757  * \param[in] lcfg      configuration structure storing default striping.
1758  *
1759  * \retval              0 if initialization succeeds
1760  * \retval              negative error number on failure
1761  */
1762 int lod_pools_init(struct lod_device *lod, struct lustre_cfg *lcfg)
1763 {
1764         struct obd_device          *obd;
1765         struct lov_desc            *desc;
1766         int                         rc;
1767         ENTRY;
1768
1769         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1770         LASSERT(obd != NULL);
1771         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
1772
1773         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1774                 CERROR("LOD setup requires a descriptor\n");
1775                 RETURN(-EINVAL);
1776         }
1777
1778         desc = (struct lov_desc *)lustre_cfg_buf(lcfg, 1);
1779
1780         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1781                 CERROR("descriptor size wrong: %d > %d\n",
1782                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1783                 RETURN(-EINVAL);
1784         }
1785
1786         if (desc->ld_magic != LOV_DESC_MAGIC) {
1787                 if (desc->ld_magic == __swab32(LOV_DESC_MAGIC)) {
1788                         CDEBUG(D_OTHER, "%s: Swabbing lov desc %p\n",
1789                                obd->obd_name, desc);
1790                         lustre_swab_lov_desc(desc);
1791                 } else {
1792                         CERROR("%s: Bad lov desc magic: %#x\n",
1793                                obd->obd_name, desc->ld_magic);
1794                         RETURN(-EINVAL);
1795                 }
1796         }
1797
1798         lod_fix_desc(desc);
1799
1800         desc->ld_active_tgt_count = 0;
1801         lod->lod_desc = *desc;
1802
1803         lod->lod_sp_me = LUSTRE_SP_CLI;
1804
1805         /* Set up allocation policy (QoS and RR) */
1806         INIT_LIST_HEAD(&lod->lod_qos.lq_oss_list);
1807         init_rwsem(&lod->lod_qos.lq_rw_sem);
1808         lod->lod_qos.lq_dirty = 1;
1809         lod->lod_qos.lq_rr.lqr_dirty = 1;
1810         lod->lod_qos.lq_reset = 1;
1811         /* Default priority is toward free space balance */
1812         lod->lod_qos.lq_prio_free = 232;
1813         /* Default threshold for rr (roughly 17%) */
1814         lod->lod_qos.lq_threshold_rr = 43;
1815
1816         /* Set up OST pool environment */
1817         lod->lod_pools_hash_body = cfs_hash_create("POOLS", HASH_POOLS_CUR_BITS,
1818                                                    HASH_POOLS_MAX_BITS,
1819                                                    HASH_POOLS_BKT_BITS, 0,
1820                                                    CFS_HASH_MIN_THETA,
1821                                                    CFS_HASH_MAX_THETA,
1822                                                    &pool_hash_operations,
1823                                                    CFS_HASH_DEFAULT);
1824         if (lod->lod_pools_hash_body == NULL)
1825                 RETURN(-ENOMEM);
1826
1827         INIT_LIST_HEAD(&lod->lod_pool_list);
1828         lod->lod_pool_count = 0;
1829         rc = lod_ost_pool_init(&lod->lod_pool_info, 0);
1830         if (rc)
1831                 GOTO(out_hash, rc);
1832         lod_qos_rr_init(&lod->lod_qos.lq_rr);
1833         rc = lod_ost_pool_init(&lod->lod_qos.lq_rr.lqr_pool, 0);
1834         if (rc)
1835                 GOTO(out_pool_info, rc);
1836
1837         RETURN(0);
1838
1839 out_pool_info:
1840         lod_ost_pool_free(&lod->lod_pool_info);
1841 out_hash:
1842         cfs_hash_putref(lod->lod_pools_hash_body);
1843
1844         return rc;
1845 }
1846
1847 /**
1848  * Release the structures describing the pools.
1849  *
1850  * \param[in] lod       LOD device from which we release the structures
1851  *
1852  * \retval              0 always
1853  */
1854 int lod_pools_fini(struct lod_device *lod)
1855 {
1856         struct obd_device   *obd = lod2obd(lod);
1857         struct pool_desc    *pool, *tmp;
1858         ENTRY;
1859
1860         list_for_each_entry_safe(pool, tmp, &lod->lod_pool_list, pool_list) {
1861                 /* free pool structs */
1862                 CDEBUG(D_INFO, "delete pool %p\n", pool);
1863                 /* In the function below, .hs_keycmp resolves to
1864                  * pool_hashkey_keycmp() */
1865                 /* coverity[overrun-buffer-val] */
1866                 lod_pool_del(obd, pool->pool_name);
1867         }
1868
1869         cfs_hash_putref(lod->lod_pools_hash_body);
1870         lod_ost_pool_free(&(lod->lod_qos.lq_rr.lqr_pool));
1871         lod_ost_pool_free(&lod->lod_pool_info);
1872
1873         RETURN(0);
1874 }