lustre/lod/lod_dev.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  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  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, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/lod/lod_dev.c
  33  *
  34  * Lustre Logical Object Device
  35  *
  36  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
  37  * Author: Mikhail Pershin <mike.pershin@intel.com>
  38  */
  39 /**
  40  * The Logical Object Device (LOD) layer manages access to striped
  41  * objects (both regular files and directories). It implements the DT
  42  * device and object APIs and is responsible for creating, storing,
  43  * and loading striping information as an extended attribute of the
  44  * underlying OSD object. LOD is the server side analog of the LOV and
  45  * LMV layers on the client side.
  46  *
  47  * Metadata LU object stack (layers of the same compound LU object,
  48  * all have the same FID):
  49  *
  50  *        MDT
  51  *         |      MD API
  52  *        MDD
  53  *         |      DT API
  54  *        LOD
  55  *       /   \    DT API
  56  *     OSD   OSP
  57  *
  58  * During LOD object initialization the localness or remoteness of the
  59  * object FID dictates the choice between OSD and OSP.
  60  *
  61  * An LOD object (file or directory) with N stripes (each has a
  62  * different FID):
  63  *
  64  *          LOD
  65  *           |
  66  *   +---+---+---+...+
  67  *   |   |   |   |   |
  68  *   S0  S1  S2  S3  S(N-1)  OS[DP] objects, seen as DT objects by LOD
  69  *
  70  * When upper layers must access an object's stripes (which are
  71  * themselves OST or MDT LU objects) LOD finds these objects by their
  72  * FIDs and stores them as an array of DT object pointers on the
  73  * object. Declarations and operations on LOD objects are received by
  74  * LOD (as DT object operations) and performed on the underlying
  75  * OS[DP] object and (as needed) on the stripes. From the perspective
  76  * of LOD, a stripe-less file (created by mknod() or open with
  77  * O_LOV_DELAY_CREATE) is an object which does not yet have stripes,
  78  * while a non-striped directory (created by mkdir()) is an object
  79  * which will never have stripes.
  80  *
  81  * The LOD layer also implements a small subset of the OBD device API
  82  * to support MDT stack initialization and finalization (an MDD device
  83  * connects and disconnects itself to and from the underlying LOD
  84  * device), and pool management. In turn LOD uses the OBD device API
  85  * to connect it self to the underlying OSD, and to connect itself to
  86  * OSP devices representing the MDTs and OSTs that bear the stripes of
  87  * its objects.
  88  */
  89
  90 #define DEBUG_SUBSYSTEM S_MDS
  91
  92 #include <linux/kthread.h>
  93 #include <obd_class.h>
  94 #include <md_object.h>
  95 #include <lustre_fid.h>
  96 #include <uapi/linux/lustre/lustre_param.h>
  97 #include <lustre_update.h>
  98 #include <lustre_log.h>
  99
 100 #include "lod_internal.h"
 101
 102 static const char lod_update_log_name[] = "update_log";
 103 static const char lod_update_log_dir_name[] = "update_log_dir";
 104
 105 /*
 106  * Lookup target by FID.
 107  *
 108  * Lookup MDT/OST target index by FID. Type of the target can be
 109  * specific or any.
 110  *
 111  * \param[in] env               LU environment provided by the caller
 112  * \param[in] lod               lod device
 113  * \param[in] fid               FID
 114  * \param[out] tgt              result target index
 115  * \param[in] type              expected type of the target:
 116  *                              LU_SEQ_RANGE_{MDT,OST,ANY}
 117  *
 118  * \retval 0                    on success
 119  * \retval negative             negated errno on error
 120  **/
 121 int lod_fld_lookup(const struct lu_env *env, struct lod_device *lod,
 122                    const struct lu_fid *fid, __u32 *tgt, int *type)
 123 {
 124         struct lu_seq_range     range = { 0 };
 125         struct lu_server_fld    *server_fld;
 126         int rc;
 127         ENTRY;
 128
 129         if (!fid_is_sane(fid)) {
 130                 CERROR("%s: invalid FID "DFID"\n", lod2obd(lod)->obd_name,
 131                        PFID(fid));
 132                 RETURN(-EIO);
 133         }
 134
 135         if (fid_is_idif(fid)) {
 136                 *tgt = fid_idif_ost_idx(fid);
 137                 *type = LU_SEQ_RANGE_OST;
 138                 RETURN(0);
 139         }
 140
 141         if (fid_is_update_log(fid) || fid_is_update_log_dir(fid)) {
 142                 *tgt = fid_oid(fid);
 143                 *type = LU_SEQ_RANGE_MDT;
 144                 RETURN(0);
 145         }
 146
 147         if (!lod->lod_initialized || (!fid_seq_in_fldb(fid_seq(fid)))) {
 148                 LASSERT(lu_site2seq(lod2lu_dev(lod)->ld_site) != NULL);
 149
 150                 *tgt = lu_site2seq(lod2lu_dev(lod)->ld_site)->ss_node_id;
 151                 *type = LU_SEQ_RANGE_MDT;
 152                 RETURN(0);
 153         }
 154
 155         server_fld = lu_site2seq(lod2lu_dev(lod)->ld_site)->ss_server_fld;
 156         if (server_fld == NULL)
 157                 RETURN(-EIO);
 158
 159         fld_range_set_type(&range, *type);
 160         rc = fld_server_lookup(env, server_fld, fid_seq(fid), &range);
 161         if (rc != 0)
 162                 RETURN(rc);
 163
 164         *tgt = range.lsr_index;
 165         *type = range.lsr_flags;
 166
 167         CDEBUG(D_INFO, "%s: got tgt %x for sequence: %#llx\n",
 168                lod2obd(lod)->obd_name, *tgt, fid_seq(fid));
 169
 170         RETURN(0);
 171 }
 172
 173 /* Slab for OSD object allocation */
 174 struct kmem_cache *lod_object_kmem;
 175
 176 /* Slab for dt_txn_callback */
 177 struct kmem_cache *lod_txn_callback_kmem;
 178 static struct lu_kmem_descr lod_caches[] = {
 179         {
 180                 .ckd_cache = &lod_object_kmem,
 181                 .ckd_name  = "lod_obj",
 182                 .ckd_size  = sizeof(struct lod_object)
 183         },
 184         {
 185                 .ckd_cache = &lod_txn_callback_kmem,
 186                 .ckd_name  = "lod_txn_callback",
 187                 .ckd_size  = sizeof(struct dt_txn_callback)
 188         },
 189         {
 190                 .ckd_cache = NULL
 191         }
 192 };
 193
 194 static struct lu_device *lod_device_fini(const struct lu_env *env,
 195                                          struct lu_device *d);
 196
 197 /**
 198  * Implementation of lu_device_operations::ldo_object_alloc() for LOD
 199  *
 200  * Allocates and initializes LOD's slice in the given object.
 201  *
 202  * see include/lu_object.h for the details.
 203  */
 204 static struct lu_object *lod_object_alloc(const struct lu_env *env,
 205                                           const struct lu_object_header *hdr,
 206                                           struct lu_device *dev)
 207 {
 208         struct lod_object       *lod_obj;
 209         struct lu_object        *lu_obj;
 210         ENTRY;
 211
 212         OBD_SLAB_ALLOC_PTR_GFP(lod_obj, lod_object_kmem, GFP_NOFS);
 213         if (lod_obj == NULL)
 214                 RETURN(ERR_PTR(-ENOMEM));
 215
 216         mutex_init(&lod_obj->ldo_layout_mutex);
 217         lu_obj = lod2lu_obj(lod_obj);
 218         dt_object_init(&lod_obj->ldo_obj, NULL, dev);
 219         lod_obj->ldo_obj.do_ops = &lod_obj_ops;
 220         lu_obj->lo_ops = &lod_lu_obj_ops;
 221
 222         RETURN(lu_obj);
 223 }
 224
 225 /**
 226  * Process the config log for all sub device.
 227  *
 228  * The function goes through all the targets in the given table
 229  * and apply given configuration command on to the targets.
 230  * Used to cleanup the targets at unmount.
 231  *
 232  * \param[in] env               LU environment provided by the caller
 233  * \param[in] lod               lod device
 234  * \param[in] ltd               target's table to go through
 235  * \param[in] lcfg              configuration command to apply
 236  *
 237  * \retval 0                    on success
 238  * \retval negative             negated errno on error
 239  **/
 240 static int lod_sub_process_config(const struct lu_env *env,
 241                                  struct lod_device *lod,
 242                                  struct lod_tgt_descs *ltd,
 243                                  struct lustre_cfg *lcfg)
 244 {
 245         struct lu_device  *next;
 246         int rc = 0;
 247         unsigned int i;
 248
 249         lod_getref(ltd);
 250         if (ltd->ltd_tgts_size <= 0) {
 251                 lod_putref(lod, ltd);
 252                 return 0;
 253         }
 254         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 255                 struct lod_tgt_desc *tgt;
 256                 int rc1;
 257
 258                 tgt = LTD_TGT(ltd, i);
 259                 LASSERT(tgt && tgt->ltd_tgt);
 260                 next = &tgt->ltd_tgt->dd_lu_dev;
 261                 rc1 = next->ld_ops->ldo_process_config(env, next, lcfg);
 262                 if (rc1) {
 263                         CERROR("%s: error cleaning up LOD index %u: cmd %#x"
 264                                ": rc = %d\n", lod2obd(lod)->obd_name, i,
 265                                lcfg->lcfg_command, rc1);
 266                         rc = rc1;
 267                 }
 268         }
 269         lod_putref(lod, ltd);
 270         return rc;
 271 }
 272
 273 struct lod_recovery_data {
 274         struct lod_device       *lrd_lod;
 275         struct lod_tgt_desc     *lrd_ltd;
 276         struct ptlrpc_thread    *lrd_thread;
 277         __u32                   lrd_idx;
 278 };
 279
 280
 281 /**
 282  * process update recovery record
 283  *
 284  * Add the update recovery recode to the update recovery list in
 285  * lod_recovery_data. Then the recovery thread (target_recovery_thread)
 286  * will redo these updates.
 287  *
 288  * \param[in]env        execution environment
 289  * \param[in]llh        log handle of update record
 290  * \param[in]rec        update record to be replayed
 291  * \param[in]data       update recovery data which holds the necessary
 292  *                      arguments for recovery (see struct lod_recovery_data)
 293  *
 294  * \retval              0 if the record is processed successfully.
 295  * \retval              negative errno if the record processing fails.
 296  */
 297 static int lod_process_recovery_updates(const struct lu_env *env,
 298                                         struct llog_handle *llh,
 299                                         struct llog_rec_hdr *rec,
 300                                         void *data)
 301 {
 302         struct lod_recovery_data        *lrd = data;
 303         struct llog_cookie      *cookie = &lod_env_info(env)->lti_cookie;
 304         struct lu_target                *lut;
 305         __u32                           index = 0;
 306         ENTRY;
 307
 308         if (lrd->lrd_ltd == NULL) {
 309                 int rc;
 310
 311                 rc = lodname2mdt_index(lod2obd(lrd->lrd_lod)->obd_name, &index);
 312                 if (rc != 0)
 313                         return rc;
 314         } else {
 315                 index = lrd->lrd_ltd->ltd_index;
 316         }
 317
 318         if (rec->lrh_len !=
 319                 llog_update_record_size((struct llog_update_record *)rec)) {
 320                 CERROR("%s broken update record! index %u "DFID".%u :"
 321                        " rc = %d\n", lod2obd(lrd->lrd_lod)->obd_name, index,
 322                        PFID(&llh->lgh_id.lgl_oi.oi_fid), rec->lrh_index, -EIO);
 323                 return -EINVAL;
 324         }
 325
 326         cookie->lgc_lgl = llh->lgh_id;
 327         cookie->lgc_index = rec->lrh_index;
 328         cookie->lgc_subsys = LLOG_UPDATELOG_ORIG_CTXT;
 329
 330         CDEBUG(D_HA, "%s: process recovery updates "DFID".%u\n",
 331                lod2obd(lrd->lrd_lod)->obd_name,
 332                PFID(&llh->lgh_id.lgl_oi.oi_fid), rec->lrh_index);
 333         lut = lod2lu_dev(lrd->lrd_lod)->ld_site->ls_tgt;
 334
 335         if (lut->lut_obd->obd_stopping ||
 336             lut->lut_obd->obd_abort_recovery)
 337                 return -ESHUTDOWN;
 338
 339         return insert_update_records_to_replay_list(lut->lut_tdtd,
 340                                         (struct llog_update_record *)rec,
 341                                         cookie, index);
 342 }
 343
 344 /**
 345  * recovery thread for update log
 346  *
 347  * Start recovery thread and prepare the sub llog, then it will retrieve
 348  * the update records from the correpondent MDT and do recovery.
 349  *
 350  * \param[in] arg       pointer to the recovery data
 351  *
 352  * \retval              0 if recovery succeeds
 353  * \retval              negative errno if recovery failed.
 354  */
 355 static int lod_sub_recovery_thread(void *arg)
 356 {
 357         struct lod_recovery_data *lrd = arg;
 358         struct lod_device *lod = lrd->lrd_lod;
 359         struct dt_device *dt;
 360         struct ptlrpc_thread *thread = lrd->lrd_thread;
 361         struct llog_ctxt *ctxt = NULL;
 362         struct lu_env env;
 363         struct lu_target *lut;
 364         struct lod_tgt_descs *ltd = &lod->lod_mdt_descs;
 365         struct lod_tgt_desc *tgt = NULL;
 366         time64_t start;
 367         int retries = 0;
 368         int i;
 369         int rc;
 370         ENTRY;
 371
 372         thread->t_flags = SVC_RUNNING;
 373         wake_up(&thread->t_ctl_waitq);
 374
 375         rc = lu_env_init(&env, LCT_LOCAL | LCT_MD_THREAD);
 376         if (rc != 0) {
 377                 OBD_FREE_PTR(lrd);
 378                 CERROR("%s: can't initialize env: rc = %d\n",
 379                        lod2obd(lod)->obd_name, rc);
 380                 RETURN(rc);
 381         }
 382
 383         lut = lod2lu_dev(lod)->ld_site->ls_tgt;
 384         atomic_inc(&lut->lut_tdtd->tdtd_recovery_threads_count);
 385         if (lrd->lrd_ltd == NULL)
 386                 dt = lod->lod_child;
 387         else
 388                 dt = lrd->lrd_ltd->ltd_tgt;
 389
 390         start = ktime_get_real_seconds();
 391
 392 again:
 393         rc = lod_sub_prep_llog(&env, lod, dt, lrd->lrd_idx);
 394         if (!rc && !lod->lod_child->dd_rdonly) {
 395                 /* Process the recovery record */
 396                 ctxt = llog_get_context(dt->dd_lu_dev.ld_obd,
 397                                         LLOG_UPDATELOG_ORIG_CTXT);
 398                 LASSERT(ctxt != NULL);
 399                 LASSERT(ctxt->loc_handle != NULL);
 400
 401                 rc = llog_cat_process(&env, ctxt->loc_handle,
 402                                       lod_process_recovery_updates, lrd, 0, 0);
 403         }
 404
 405         if (rc < 0) {
 406                 struct lu_device *top_device;
 407
 408                 top_device = lod->lod_dt_dev.dd_lu_dev.ld_site->ls_top_dev;
 409                 /* Because the remote target might failover at the same time,
 410                  * let's retry here */
 411                 if ((rc == -ETIMEDOUT || rc == -EAGAIN || rc == -EIO) &&
 412                      dt != lod->lod_child &&
 413                     !top_device->ld_obd->obd_abort_recovery &&
 414                     !top_device->ld_obd->obd_stopping) {
 415                         if (ctxt != NULL) {
 416                                 if (ctxt->loc_handle != NULL)
 417                                         llog_cat_close(&env,
 418                                                        ctxt->loc_handle);
 419                                 llog_ctxt_put(ctxt);
 420                         }
 421                         retries++;
 422                         CDEBUG(D_HA, "%s get update log failed %d, retry\n",
 423                                dt->dd_lu_dev.ld_obd->obd_name, rc);
 424                         goto again;
 425                 }
 426
 427                 CERROR("%s get update log failed: rc = %d\n",
 428                        dt->dd_lu_dev.ld_obd->obd_name, rc);
 429                 llog_ctxt_put(ctxt);
 430
 431                 spin_lock(&top_device->ld_obd->obd_dev_lock);
 432                 if (!top_device->ld_obd->obd_abort_recovery &&
 433                     !top_device->ld_obd->obd_stopping)
 434                         top_device->ld_obd->obd_abort_recovery = 1;
 435                 spin_unlock(&top_device->ld_obd->obd_dev_lock);
 436
 437                 GOTO(out, rc);
 438         }
 439         llog_ctxt_put(ctxt);
 440
 441         CDEBUG(D_HA, "%s retrieved update log, duration %lld, retries %d\n",
 442                dt->dd_lu_dev.ld_obd->obd_name, ktime_get_real_seconds() - start,
 443                retries);
 444
 445         spin_lock(&lod->lod_lock);
 446         if (lrd->lrd_ltd == NULL)
 447                 lod->lod_child_got_update_log = 1;
 448         else
 449                 lrd->lrd_ltd->ltd_got_update_log = 1;
 450
 451         if (!lod->lod_child_got_update_log) {
 452                 spin_unlock(&lod->lod_lock);
 453                 GOTO(out, rc = 0);
 454         }
 455
 456         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 457                 tgt = LTD_TGT(ltd, i);
 458                 if (!tgt->ltd_got_update_log) {
 459                         spin_unlock(&lod->lod_lock);
 460                         GOTO(out, rc = 0);
 461                 }
 462         }
 463         lut->lut_tdtd->tdtd_replay_ready = 1;
 464         spin_unlock(&lod->lod_lock);
 465
 466         CDEBUG(D_HA, "%s got update logs from all MDTs.\n",
 467                lut->lut_obd->obd_name);
 468         wake_up(&lut->lut_obd->obd_next_transno_waitq);
 469         EXIT;
 470
 471 out:
 472         OBD_FREE_PTR(lrd);
 473         thread->t_flags = SVC_STOPPED;
 474         atomic_dec(&lut->lut_tdtd->tdtd_recovery_threads_count);
 475         wake_up(&lut->lut_tdtd->tdtd_recovery_threads_waitq);
 476         wake_up(&thread->t_ctl_waitq);
 477         lu_env_fini(&env);
 478         return rc;
 479 }
 480
 481 /**
 482  * finish sub llog context
 483  *
 484  * Stop update recovery thread for the sub device, then cleanup the
 485  * correspondent llog ctxt.
 486  *
 487  * \param[in] env      execution environment
 488  * \param[in] lod      lod device to do update recovery
 489  * \param[in] thread   recovery thread on this sub device
 490  */
 491 void lod_sub_fini_llog(const struct lu_env *env,
 492                        struct dt_device *dt, struct ptlrpc_thread *thread)
 493 {
 494         struct obd_device       *obd;
 495         struct llog_ctxt        *ctxt;
 496         ENTRY;
 497
 498         obd = dt->dd_lu_dev.ld_obd;
 499         CDEBUG(D_INFO, "%s: finish sub llog\n", obd->obd_name);
 500         /* Stop recovery thread first */
 501         if (thread != NULL && thread->t_flags & SVC_RUNNING) {
 502                 thread->t_flags = SVC_STOPPING;
 503                 wake_up(&thread->t_ctl_waitq);
 504                 wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
 505         }
 506
 507         ctxt = llog_get_context(obd, LLOG_UPDATELOG_ORIG_CTXT);
 508         if (ctxt == NULL)
 509                 RETURN_EXIT;
 510
 511         if (ctxt->loc_handle != NULL)
 512                 llog_cat_close(env, ctxt->loc_handle);
 513
 514         llog_cleanup(env, ctxt);
 515
 516         RETURN_EXIT;
 517 }
 518
 519 /**
 520  * Extract MDT target index from a device name.
 521  *
 522  * a helper function to extract index from the given device name
 523  * like "fsname-MDTxxxx-mdtlov"
 524  *
 525  * \param[in] lodname           device name
 526  * \param[out] mdt_index        extracted index
 527  *
 528  * \retval 0            on success
 529  * \retval -EINVAL      if the name is invalid
 530  */
 531 int lodname2mdt_index(char *lodname, __u32 *mdt_index)
 532 {
 533         unsigned long index;
 534         char *ptr, *tmp;
 535
 536         /* 1.8 configs don't have "-MDT0000" at the end */
 537         ptr = strstr(lodname, "-MDT");
 538         if (ptr == NULL) {
 539                 *mdt_index = 0;
 540                 return 0;
 541         }
 542
 543         ptr = strrchr(lodname, '-');
 544         if (ptr == NULL) {
 545                 CERROR("invalid MDT index in '%s'\n", lodname);
 546                 return -EINVAL;
 547         }
 548
 549         if (strncmp(ptr, "-mdtlov", 7) != 0) {
 550                 CERROR("invalid MDT index in '%s'\n", lodname);
 551                 return -EINVAL;
 552         }
 553
 554         if ((unsigned long)ptr - (unsigned long)lodname <= 8) {
 555                 CERROR("invalid MDT index in '%s'\n", lodname);
 556                 return -EINVAL;
 557         }
 558
 559         if (strncmp(ptr - 8, "-MDT", 4) != 0) {
 560                 CERROR("invalid MDT index in '%s'\n", lodname);
 561                 return -EINVAL;
 562         }
 563
 564         index = simple_strtol(ptr - 4, &tmp, 16);
 565         if (*tmp != '-' || index > INT_MAX) {
 566                 CERROR("invalid MDT index in '%s'\n", lodname);
 567                 return -EINVAL;
 568         }
 569         *mdt_index = index;
 570         return 0;
 571 }
 572
 573 /**
 574  * Init sub llog context
 575  *
 576  * Setup update llog ctxt for update recovery threads, then start the
 577  * recovery thread (lod_sub_recovery_thread) to read update llog from
 578  * the correspondent MDT to do update recovery.
 579  *
 580  * \param[in] env       execution environment
 581  * \param[in] lod       lod device to do update recovery
 582  * \param[in] dt        sub dt device for which the recovery thread is
 583  *
 584  * \retval              0 if initialization succeeds.
 585  * \retval              negative errno if initialization fails.
 586  */
 587 int lod_sub_init_llog(const struct lu_env *env, struct lod_device *lod,
 588                       struct dt_device *dt)
 589 {
 590         struct obd_device               *obd;
 591         struct lod_recovery_data        *lrd = NULL;
 592         struct ptlrpc_thread            *thread;
 593         struct task_struct              *task;
 594         struct l_wait_info              lwi = { 0 };
 595         struct lod_tgt_desc             *sub_ltd = NULL;
 596         __u32                           index;
 597         __u32                           master_index;
 598         int                             rc;
 599         ENTRY;
 600
 601         rc = lodname2mdt_index(lod2obd(lod)->obd_name, &master_index);
 602         if (rc != 0)
 603                 RETURN(rc);
 604
 605         OBD_ALLOC_PTR(lrd);
 606         if (lrd == NULL)
 607                 RETURN(-ENOMEM);
 608
 609         if (lod->lod_child == dt) {
 610                 thread = &lod->lod_child_recovery_thread;
 611                 index = master_index;
 612         } else {
 613                 struct lod_tgt_descs    *ltd = &lod->lod_mdt_descs;
 614                 struct lod_tgt_desc     *tgt = NULL;
 615                 unsigned int            i;
 616
 617                 cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 618                         tgt = LTD_TGT(ltd, i);
 619                         if (tgt->ltd_tgt == dt) {
 620                                 index = tgt->ltd_index;
 621                                 sub_ltd = tgt;
 622                                 break;
 623                         }
 624                 }
 625                 LASSERT(sub_ltd != NULL);
 626                 OBD_ALLOC_PTR(sub_ltd->ltd_recovery_thread);
 627                 if (sub_ltd->ltd_recovery_thread == NULL)
 628                         GOTO(free_lrd, rc = -ENOMEM);
 629
 630                 thread = sub_ltd->ltd_recovery_thread;
 631         }
 632
 633         CDEBUG(D_INFO, "%s init sub log %s\n", lod2obd(lod)->obd_name,
 634                dt->dd_lu_dev.ld_obd->obd_name);
 635         lrd->lrd_lod = lod;
 636         lrd->lrd_ltd = sub_ltd;
 637         lrd->lrd_thread = thread;
 638         lrd->lrd_idx = index;
 639         init_waitqueue_head(&thread->t_ctl_waitq);
 640
 641         obd = dt->dd_lu_dev.ld_obd;
 642         obd->obd_lvfs_ctxt.dt = dt;
 643         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_UPDATELOG_ORIG_CTXT,
 644                         NULL, &llog_common_cat_ops);
 645         if (rc < 0) {
 646                 CERROR("%s: cannot setup updatelog llog: rc = %d\n",
 647                        obd->obd_name, rc);
 648                 GOTO(free_thread, rc);
 649         }
 650
 651         /* Start the recovery thread */
 652         task = kthread_run(lod_sub_recovery_thread, lrd, "lod%04x_rec%04x",
 653                            master_index, index);
 654         if (IS_ERR(task)) {
 655                 rc = PTR_ERR(task);
 656                 CERROR("%s: cannot start recovery thread: rc = %d\n",
 657                        obd->obd_name, rc);
 658                 GOTO(out_llog, rc);
 659         }
 660
 661         l_wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_RUNNING ||
 662                                           thread->t_flags & SVC_STOPPED, &lwi);
 663
 664         RETURN(0);
 665 out_llog:
 666         lod_sub_fini_llog(env, dt, thread);
 667 free_thread:
 668         if (lod->lod_child != dt) {
 669                 OBD_FREE_PTR(sub_ltd->ltd_recovery_thread);
 670                 sub_ltd->ltd_recovery_thread = NULL;
 671         }
 672 free_lrd:
 673         OBD_FREE_PTR(lrd);
 674         RETURN(rc);
 675 }
 676
 677 /**
 678  * Stop sub recovery thread
 679  *
 680  * Stop sub recovery thread on all subs.
 681  *
 682  * \param[in] env       execution environment
 683  * \param[in] lod       lod device to do update recovery
 684  */
 685 static void lod_sub_stop_recovery_threads(const struct lu_env *env,
 686                                           struct lod_device *lod)
 687 {
 688         struct lod_tgt_descs *ltd = &lod->lod_mdt_descs;
 689         struct ptlrpc_thread    *thread;
 690         unsigned int i;
 691
 692         /* Stop the update log commit cancel threads and finish master
 693          * llog ctxt */
 694         thread = &lod->lod_child_recovery_thread;
 695         /* Stop recovery thread first */
 696         if (thread != NULL && thread->t_flags & SVC_RUNNING) {
 697                 thread->t_flags = SVC_STOPPING;
 698                 wake_up(&thread->t_ctl_waitq);
 699                 wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
 700         }
 701
 702         lod_getref(ltd);
 703         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 704                 struct lod_tgt_desc     *tgt;
 705
 706                 tgt = LTD_TGT(ltd, i);
 707                 thread = tgt->ltd_recovery_thread;
 708                 if (thread != NULL && thread->t_flags & SVC_RUNNING) {
 709                         thread->t_flags = SVC_STOPPING;
 710                         wake_up(&thread->t_ctl_waitq);
 711                         wait_event(thread->t_ctl_waitq,
 712                                    thread->t_flags & SVC_STOPPED);
 713                         OBD_FREE_PTR(tgt->ltd_recovery_thread);
 714                         tgt->ltd_recovery_thread = NULL;
 715                 }
 716         }
 717
 718         lod_putref(lod, ltd);
 719 }
 720
 721 /**
 722  * finish all sub llog
 723  *
 724  * cleanup all of sub llog ctxt on the LOD.
 725  *
 726  * \param[in] env       execution environment
 727  * \param[in] lod       lod device to do update recovery
 728  */
 729 static void lod_sub_fini_all_llogs(const struct lu_env *env,
 730                                    struct lod_device *lod)
 731 {
 732         struct lod_tgt_descs *ltd = &lod->lod_mdt_descs;
 733         unsigned int i;
 734
 735         /* Stop the update log commit cancel threads and finish master
 736          * llog ctxt */
 737         lod_sub_fini_llog(env, lod->lod_child,
 738                           &lod->lod_child_recovery_thread);
 739         lod_getref(ltd);
 740         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 741                 struct lod_tgt_desc     *tgt;
 742
 743                 tgt = LTD_TGT(ltd, i);
 744                 lod_sub_fini_llog(env, tgt->ltd_tgt,
 745                                   tgt->ltd_recovery_thread);
 746         }
 747
 748         lod_putref(lod, ltd);
 749 }
 750
 751 static char *lod_show_update_logs_retrievers(void *data, int *size, int *count)
 752 {
 753         struct lod_device       *lod = (struct lod_device *)data;
 754         struct lu_target        *lut = lod2lu_dev(lod)->ld_site->ls_tgt;
 755         struct lod_tgt_descs    *ltd = &lod->lod_mdt_descs;
 756         struct lod_tgt_desc     *tgt = NULL;
 757         char                    *buf;
 758         int                      len = 0;
 759         int                      rc;
 760         int                      i;
 761
 762         *count = atomic_read(&lut->lut_tdtd->tdtd_recovery_threads_count);
 763         if (*count == 0) {
 764                 *size = 0;
 765                 return NULL;
 766         }
 767
 768         *size = 5 * *count + 1;
 769         OBD_ALLOC(buf, *size);
 770         if (buf == NULL)
 771                 return NULL;
 772
 773         *count = 0;
 774         memset(buf, 0, *size);
 775
 776         if (!lod->lod_child_got_update_log) {
 777                 rc = lodname2mdt_index(lod2obd(lod)->obd_name, &i);
 778                 LASSERTF(rc == 0, "Fail to parse target index: rc = %d\n", rc);
 779
 780                 rc = snprintf(buf + len, *size - len, " %04x", i);
 781                 LASSERT(rc > 0);
 782
 783                 len += rc;
 784                 (*count)++;
 785         }
 786
 787         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 788                 tgt = LTD_TGT(ltd, i);
 789                 if (!tgt->ltd_got_update_log) {
 790                         rc = snprintf(buf + len, *size - len, " %04x", i);
 791                         if (unlikely(rc <= 0))
 792                                 break;
 793
 794                         len += rc;
 795                         (*count)++;
 796                 }
 797         }
 798
 799         return buf;
 800 }
 801
 802 /**
 803  * Prepare distribute txn
 804  *
 805  * Prepare distribute txn structure for LOD
 806  *
 807  * \param[in] env       execution environment
 808  * \param[in] lod_device  LOD device
 809  *
 810  * \retval              0 if preparation succeeds.
 811  * \retval              negative errno if preparation fails.
 812  */
 813 static int lod_prepare_distribute_txn(const struct lu_env *env,
 814                                       struct lod_device *lod)
 815 {
 816         struct target_distribute_txn_data *tdtd;
 817         struct lu_target                  *lut;
 818         int                               rc;
 819         ENTRY;
 820
 821         /* Init update recovery data */
 822         OBD_ALLOC_PTR(tdtd);
 823         if (tdtd == NULL)
 824                 RETURN(-ENOMEM);
 825
 826         lut = lod2lu_dev(lod)->ld_site->ls_tgt;
 827         tdtd->tdtd_dt = &lod->lod_dt_dev;
 828         rc = distribute_txn_init(env, lut, tdtd,
 829                 lu_site2seq(lod2lu_dev(lod)->ld_site)->ss_node_id);
 830
 831         if (rc < 0) {
 832                 CERROR("%s: cannot init distribute txn: rc = %d\n",
 833                        lod2obd(lod)->obd_name, rc);
 834                 OBD_FREE_PTR(tdtd);
 835                 RETURN(rc);
 836         }
 837
 838         tdtd->tdtd_show_update_logs_retrievers =
 839                 lod_show_update_logs_retrievers;
 840         tdtd->tdtd_show_retrievers_cbdata = lod;
 841
 842         lut->lut_tdtd = tdtd;
 843
 844         RETURN(0);
 845 }
 846
 847 /**
 848  * Finish distribute txn
 849  *
 850  * Release the resource holding by distribute txn, i.e. stop distribute
 851  * txn thread.
 852  *
 853  * \param[in] env       execution environment
 854  * \param[in] lod       lod device
 855  */
 856 static void lod_fini_distribute_txn(const struct lu_env *env,
 857                                     struct lod_device *lod)
 858 {
 859         struct lu_target                  *lut;
 860
 861         lut = lod2lu_dev(lod)->ld_site->ls_tgt;
 862         target_recovery_fini(lut->lut_obd);
 863         if (lut->lut_tdtd == NULL)
 864                 return;
 865
 866         distribute_txn_fini(env, lut->lut_tdtd);
 867
 868         OBD_FREE_PTR(lut->lut_tdtd);
 869         lut->lut_tdtd = NULL;
 870 }
 871
 872 /**
 873  * Implementation of lu_device_operations::ldo_process_config() for LOD
 874  *
 875  * The method is called by the configuration subsystem during setup,
 876  * cleanup and when the configuration changes. The method processes
 877  * few specific commands like adding/removing the targets, changing
 878  * the runtime parameters.
 879
 880  * \param[in] env               LU environment provided by the caller
 881  * \param[in] dev               lod device
 882  * \param[in] lcfg              configuration command to apply
 883  *
 884  * \retval 0                    on success
 885  * \retval negative             negated errno on error
 886  *
 887  * The examples are below.
 888  *
 889  * Add osc config log:
 890  * marker  20 (flags=0x01, v2.2.49.56) lustre-OST0001  'add osc'
 891  * add_uuid  nid=192.168.122.162@tcp(0x20000c0a87aa2)  0:  1:nidxxx
 892  * attach    0:lustre-OST0001-osc-MDT0001  1:osc  2:lustre-MDT0001-mdtlov_UUID
 893  * setup     0:lustre-OST0001-osc-MDT0001  1:lustre-OST0001_UUID  2:nid
 894  * lov_modify_tgts add 0:lustre-MDT0001-mdtlov  1:lustre-OST0001_UUID  2:1  3:1
 895  * marker  20 (flags=0x02, v2.2.49.56) lustre-OST0001  'add osc'
 896  *
 897  * Add mdc config log:
 898  * marker  10 (flags=0x01, v2.2.49.56) lustre-MDT0000  'add osp'
 899  * add_uuid  nid=192.168.122.162@tcp(0x20000c0a87aa2)  0:  1:nid
 900  * attach 0:lustre-MDT0000-osp-MDT0001  1:osp  2:lustre-MDT0001-mdtlov_UUID
 901  * setup     0:lustre-MDT0000-osp-MDT0001  1:lustre-MDT0000_UUID  2:nid
 902  * modify_mdc_tgts add 0:lustre-MDT0001  1:lustre-MDT0000_UUID  2:0  3:1
 903  * marker  10 (flags=0x02, v2.2.49.56) lustre-MDT0000_UUID  'add osp'
 904  */
 905 static int lod_process_config(const struct lu_env *env,
 906                               struct lu_device *dev,
 907                               struct lustre_cfg *lcfg)
 908 {
 909         struct lod_device *lod = lu2lod_dev(dev);
 910         struct lu_device  *next = &lod->lod_child->dd_lu_dev;
 911         char              *arg1;
 912         int                rc = 0;
 913         ENTRY;
 914
 915         switch(lcfg->lcfg_command) {
 916         case LCFG_LOV_DEL_OBD:
 917         case LCFG_LOV_ADD_INA:
 918         case LCFG_LOV_ADD_OBD:
 919         case LCFG_ADD_MDC: {
 920                 __u32 index;
 921                 __u32 mdt_index;
 922                 int gen;
 923                 /* lov_modify_tgts add  0:lov_mdsA  1:osp  2:0  3:1
 924                  * modify_mdc_tgts add  0:lustre-MDT0001
 925                  *                    1:lustre-MDT0001-mdc0002
 926                  *                    2:2  3:1*/
 927                 arg1 = lustre_cfg_string(lcfg, 1);
 928
 929                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%d", &index) != 1)
 930                         GOTO(out, rc = -EINVAL);
 931                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
 932                         GOTO(out, rc = -EINVAL);
 933
 934                 if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD) {
 935                         __u32 mdt_index;
 936
 937                         rc = lodname2mdt_index(lustre_cfg_string(lcfg, 0),
 938                                                &mdt_index);
 939                         if (rc != 0)
 940                                 GOTO(out, rc);
 941
 942                         rc = lod_add_device(env, lod, arg1, index, gen,
 943                                             mdt_index, LUSTRE_OSC_NAME, 1);
 944                 } else if (lcfg->lcfg_command == LCFG_ADD_MDC) {
 945                         mdt_index = index;
 946                         rc = lod_add_device(env, lod, arg1, index, gen,
 947                                             mdt_index, LUSTRE_MDC_NAME, 1);
 948                 } else if (lcfg->lcfg_command == LCFG_LOV_ADD_INA) {
 949                         /*FIXME: Add mdt_index for LCFG_LOV_ADD_INA*/
 950                         mdt_index = 0;
 951                         rc = lod_add_device(env, lod, arg1, index, gen,
 952                                             mdt_index, LUSTRE_OSC_NAME, 0);
 953                 } else {
 954                         rc = lod_del_device(env, lod,
 955                                             &lod->lod_ost_descs,
 956                                             arg1, index, gen, true);
 957                 }
 958
 959                 break;
 960         }
 961
 962         case LCFG_PARAM: {
 963                 struct obd_device *obd;
 964                 ssize_t count;
 965                 char *param;
 966
 967                 /* Check if it is activate/deactivate mdc
 968                  * lustre-MDTXXXX-osp-MDTXXXX.active=1 */
 969                 param = lustre_cfg_buf(lcfg, 1);
 970                 if (strstr(param, "osp") != NULL &&
 971                     strstr(param, ".active=") != NULL) {
 972                         struct lod_tgt_descs    *ltd = &lod->lod_mdt_descs;
 973                         struct lod_tgt_desc     *sub_tgt = NULL;
 974                         char *ptr;
 975                         char *tmp;
 976                         int i;
 977
 978                         ptr = strstr(param, ".");
 979                         *ptr = '\0';
 980                         obd = class_name2obd(param);
 981                         if (obd == NULL) {
 982                                 CERROR("%s: can not find %s: rc = %d\n",
 983                                        lod2obd(lod)->obd_name, param, -EINVAL);
 984                                 *ptr = '.';
 985                                 GOTO(out, rc);
 986                         }
 987
 988                         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 989                                 struct lod_tgt_desc *tgt;
 990
 991                                 tgt = LTD_TGT(ltd, i);
 992                                 if (tgt->ltd_tgt->dd_lu_dev.ld_obd == obd) {
 993                                         sub_tgt = tgt;
 994                                         break;
 995                                 }
 996                         }
 997
 998                         if (sub_tgt == NULL) {
 999                                 CERROR("%s: can not find %s: rc = %d\n",
1000                                        lod2obd(lod)->obd_name, param, -EINVAL);
1001                                 *ptr = '.';
1002                                 GOTO(out, rc);
1003                         }
1004
1005                         *ptr = '.';
1006                         tmp = strstr(param, "=");
1007                         tmp++;
1008                         if (*tmp == '1') {
1009                                 struct llog_ctxt *ctxt;
1010
1011                                 obd = sub_tgt->ltd_tgt->dd_lu_dev.ld_obd;
1012                                 ctxt = llog_get_context(obd,
1013                                                 LLOG_UPDATELOG_ORIG_CTXT);
1014                                 if (ctxt == NULL) {
1015                                         rc = llog_setup(env, obd, &obd->obd_olg,
1016                                                        LLOG_UPDATELOG_ORIG_CTXT,
1017                                                     NULL, &llog_common_cat_ops);
1018                                         if (rc < 0)
1019                                                 GOTO(out, rc);
1020                                 } else {
1021                                         llog_ctxt_put(ctxt);
1022                                 }
1023                                 rc = lod_sub_prep_llog(env, lod,
1024                                                        sub_tgt->ltd_tgt,
1025                                                        sub_tgt->ltd_index);
1026                                 if (rc == 0)
1027                                         sub_tgt->ltd_active = 1;
1028                         } else {
1029                                 lod_sub_fini_llog(env, sub_tgt->ltd_tgt,
1030                                                   NULL);
1031                                 sub_tgt->ltd_active = 0;
1032                         }
1033                         GOTO(out, rc);
1034                 }
1035
1036
1037                 if (strstr(param, PARAM_LOD) != NULL)
1038                         count = class_modify_config(lcfg, PARAM_LOD,
1039                                                     &lod->lod_dt_dev.dd_kobj);
1040                 else
1041                         count = class_modify_config(lcfg, PARAM_LOV,
1042                                                     &lod->lod_dt_dev.dd_kobj);
1043                 rc = count > 0 ? 0 : count;
1044                 GOTO(out, rc);
1045         }
1046         case LCFG_PRE_CLEANUP: {
1047                 lod_sub_process_config(env, lod, &lod->lod_mdt_descs, lcfg);
1048                 lod_sub_process_config(env, lod, &lod->lod_ost_descs, lcfg);
1049                 next = &lod->lod_child->dd_lu_dev;
1050                 rc = next->ld_ops->ldo_process_config(env, next, lcfg);
1051                 if (rc != 0)
1052                         CDEBUG(D_HA, "%s: can't process %u: %d\n",
1053                                lod2obd(lod)->obd_name, lcfg->lcfg_command, rc);
1054
1055                 lod_sub_stop_recovery_threads(env, lod);
1056                 lod_fini_distribute_txn(env, lod);
1057                 lod_sub_fini_all_llogs(env, lod);
1058                 break;
1059         }
1060         case LCFG_CLEANUP: {
1061                 if (lod->lod_md_root != NULL) {
1062                         dt_object_put(env, &lod->lod_md_root->ldo_obj);
1063                         lod->lod_md_root = NULL;
1064                 }
1065
1066                 /*
1067                  * do cleanup on underlying storage only when
1068                  * all OSPs are cleaned up, as they use that OSD as well
1069                  */
1070                 lu_dev_del_linkage(dev->ld_site, dev);
1071                 lod_sub_process_config(env, lod, &lod->lod_mdt_descs, lcfg);
1072                 lod_sub_process_config(env, lod, &lod->lod_ost_descs, lcfg);
1073                 next = &lod->lod_child->dd_lu_dev;
1074                 rc = next->ld_ops->ldo_process_config(env, next, lcfg);
1075                 if (rc)
1076                         CERROR("%s: can't process %u: %d\n",
1077                                lod2obd(lod)->obd_name, lcfg->lcfg_command, rc);
1078
1079                 rc = obd_disconnect(lod->lod_child_exp);
1080                 if (rc)
1081                         CERROR("error in disconnect from storage: %d\n", rc);
1082                 break;
1083         }
1084         default:
1085                CERROR("%s: unknown command %u\n", lod2obd(lod)->obd_name,
1086                       lcfg->lcfg_command);
1087                rc = -EINVAL;
1088                break;
1089         }
1090
1091 out:
1092         RETURN(rc);
1093 }
1094
1095 /**
1096  * Implementation of lu_device_operations::ldo_recovery_complete() for LOD
1097  *
1098  * The method is called once the recovery is complete. This implementation
1099  * distributes the notification to all the known targets.
1100  *
1101  * see include/lu_object.h for the details
1102  */
1103 static int lod_recovery_complete(const struct lu_env *env,
1104                                  struct lu_device *dev)
1105 {
1106         struct lod_device   *lod = lu2lod_dev(dev);
1107         struct lu_device    *next = &lod->lod_child->dd_lu_dev;
1108         unsigned int         i;
1109         int                  rc;
1110         ENTRY;
1111
1112         LASSERT(lod->lod_recovery_completed == 0);
1113         lod->lod_recovery_completed = 1;
1114
1115         rc = next->ld_ops->ldo_recovery_complete(env, next);
1116
1117         lod_getref(&lod->lod_ost_descs);
1118         if (lod->lod_osts_size > 0) {
1119                 cfs_foreach_bit(lod->lod_ost_bitmap, i) {
1120                         struct lod_tgt_desc *tgt;
1121                         tgt = OST_TGT(lod, i);
1122                         LASSERT(tgt && tgt->ltd_tgt);
1123                         next = &tgt->ltd_ost->dd_lu_dev;
1124                         rc = next->ld_ops->ldo_recovery_complete(env, next);
1125                         if (rc)
1126                                 CERROR("%s: can't complete recovery on #%d:"
1127                                         "%d\n", lod2obd(lod)->obd_name, i, rc);
1128                 }
1129         }
1130         lod_putref(lod, &lod->lod_ost_descs);
1131         RETURN(rc);
1132 }
1133
1134 /**
1135  * Init update logs on all sub device
1136  *
1137  * LOD initialize update logs on all of sub devices. Because the initialization
1138  * process might need FLD lookup, see llog_osd_open()->dt_locate()->...->
1139  * lod_object_init(), this API has to be called after LOD is initialized.
1140  * \param[in] env       execution environment
1141  * \param[in] lod       lod device
1142  *
1143  * \retval              0 if update log is initialized successfully.
1144  * \retval              negative errno if initialization fails.
1145  */
1146 static int lod_sub_init_llogs(const struct lu_env *env, struct lod_device *lod)
1147 {
1148         struct lod_tgt_descs    *ltd = &lod->lod_mdt_descs;
1149         int                     rc;
1150         unsigned int            i;
1151         ENTRY;
1152
1153         /* llog must be setup after LOD is initialized, because llog
1154          * initialization include FLD lookup */
1155         LASSERT(lod->lod_initialized);
1156
1157         /* Init the llog in its own stack */
1158         rc = lod_sub_init_llog(env, lod, lod->lod_child);
1159         if (rc < 0)
1160                 RETURN(rc);
1161
1162         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
1163                 struct lod_tgt_desc     *tgt;
1164
1165                 tgt = LTD_TGT(ltd, i);
1166                 rc = lod_sub_init_llog(env, lod, tgt->ltd_tgt);
1167                 if (rc != 0)
1168                         break;
1169         }
1170
1171         RETURN(rc);
1172 }
1173
1174 /**
1175  * Implementation of lu_device_operations::ldo_prepare() for LOD
1176  *
1177  * see include/lu_object.h for the details.
1178  */
1179 static int lod_prepare(const struct lu_env *env, struct lu_device *pdev,
1180                        struct lu_device *cdev)
1181 {
1182         struct lod_device       *lod = lu2lod_dev(cdev);
1183         struct lu_device        *next = &lod->lod_child->dd_lu_dev;
1184         struct lu_fid           *fid = &lod_env_info(env)->lti_fid;
1185         int                     rc;
1186         struct dt_object        *root;
1187         struct dt_object        *dto;
1188         __u32                   index;
1189         ENTRY;
1190
1191         rc = next->ld_ops->ldo_prepare(env, pdev, next);
1192         if (rc != 0) {
1193                 CERROR("%s: prepare bottom error: rc = %d\n",
1194                        lod2obd(lod)->obd_name, rc);
1195                 RETURN(rc);
1196         }
1197
1198         lod->lod_initialized = 1;
1199
1200         rc = dt_root_get(env, lod->lod_child, fid);
1201         if (rc < 0)
1202                 RETURN(rc);
1203
1204         root = dt_locate(env, lod->lod_child, fid);
1205         if (IS_ERR(root))
1206                 RETURN(PTR_ERR(root));
1207
1208         /* Create update log object */
1209         index = lu_site2seq(lod2lu_dev(lod)->ld_site)->ss_node_id;
1210         lu_update_log_fid(fid, index);
1211
1212         dto = local_file_find_or_create_with_fid(env, lod->lod_child,
1213                                                  fid, root,
1214                                                  lod_update_log_name,
1215                                                  S_IFREG | S_IRUGO | S_IWUSR);
1216         if (IS_ERR(dto))
1217                 GOTO(out_put, rc = PTR_ERR(dto));
1218
1219         dt_object_put(env, dto);
1220
1221         /* Create update log dir */
1222         lu_update_log_dir_fid(fid, index);
1223         dto = local_file_find_or_create_with_fid(env, lod->lod_child,
1224                                                  fid, root,
1225                                                  lod_update_log_dir_name,
1226                                                  S_IFDIR | S_IRUGO | S_IWUSR);
1227         if (IS_ERR(dto))
1228                 GOTO(out_put, rc = PTR_ERR(dto));
1229
1230         dt_object_put(env, dto);
1231
1232         rc = lod_prepare_distribute_txn(env, lod);
1233         if (rc != 0)
1234                 GOTO(out_put, rc);
1235
1236         rc = lod_sub_init_llogs(env, lod);
1237         if (rc != 0)
1238                 GOTO(out_put, rc);
1239
1240 out_put:
1241         dt_object_put(env, root);
1242
1243         RETURN(rc);
1244 }
1245
1246 const struct lu_device_operations lod_lu_ops = {
1247         .ldo_object_alloc       = lod_object_alloc,
1248         .ldo_process_config     = lod_process_config,
1249         .ldo_recovery_complete  = lod_recovery_complete,
1250         .ldo_prepare            = lod_prepare,
1251 };
1252
1253 /**
1254  * Implementation of dt_device_operations::dt_root_get() for LOD
1255  *
1256  * see include/dt_object.h for the details.
1257  */
1258 static int lod_root_get(const struct lu_env *env,
1259                         struct dt_device *dev, struct lu_fid *f)
1260 {
1261         return dt_root_get(env, dt2lod_dev(dev)->lod_child, f);
1262 }
1263
1264 static void lod_statfs_sum(struct obd_statfs *sfs,
1265                              struct obd_statfs *ost_sfs, int *bs)
1266 {
1267         while (ost_sfs->os_bsize < *bs) {
1268                 *bs >>= 1;
1269                 sfs->os_bsize >>= 1;
1270                 sfs->os_bavail <<= 1;
1271                 sfs->os_blocks <<= 1;
1272                 sfs->os_bfree <<= 1;
1273                 sfs->os_granted <<= 1;
1274         }
1275         while (ost_sfs->os_bsize > *bs) {
1276                 ost_sfs->os_bsize >>= 1;
1277                 ost_sfs->os_bavail <<= 1;
1278                 ost_sfs->os_blocks <<= 1;
1279                 ost_sfs->os_bfree <<= 1;
1280                 ost_sfs->os_granted <<= 1;
1281         }
1282         sfs->os_bavail += ost_sfs->os_bavail;
1283         sfs->os_blocks += ost_sfs->os_blocks;
1284         sfs->os_bfree += ost_sfs->os_bfree;
1285         sfs->os_granted += ost_sfs->os_granted;
1286 }
1287
1288 /**
1289  * Implementation of dt_device_operations::dt_statfs() for LOD
1290  *
1291  * see include/dt_object.h for the details.
1292  */
1293 static int lod_statfs(const struct lu_env *env,
1294                       struct dt_device *dev, struct obd_statfs *sfs)
1295 {
1296         struct lod_device   *lod = dt2lod_dev(dev);
1297         struct lod_ost_desc *ost;
1298         struct lod_mdt_desc *mdt;
1299         struct obd_statfs    ost_sfs;
1300         int i, rc, bs;
1301         bool mdtonly;
1302
1303         rc = dt_statfs(env, dt2lod_dev(dev)->lod_child, sfs);
1304         if (rc)
1305                 GOTO(out, rc);
1306
1307         bs = sfs->os_bsize;
1308
1309         sfs->os_bavail = 0;
1310         sfs->os_blocks = 0;
1311         sfs->os_bfree = 0;
1312         sfs->os_granted = 0;
1313
1314         lod_getref(&lod->lod_mdt_descs);
1315         lod_foreach_mdt(lod, i) {
1316                 mdt = MDT_TGT(lod, i);
1317                 LASSERT(mdt && mdt->ltd_mdt);
1318                 rc = dt_statfs(env, mdt->ltd_mdt, &ost_sfs);
1319                 /* ignore errors */
1320                 if (rc)
1321                         continue;
1322                 sfs->os_files += ost_sfs.os_files;
1323                 sfs->os_ffree += ost_sfs.os_ffree;
1324                 lod_statfs_sum(sfs, &ost_sfs, &bs);
1325         }
1326         lod_putref(lod, &lod->lod_mdt_descs);
1327
1328         /* at some point we can check whether DoM is enabled and
1329          * decide how to account MDT space. for simplicity let's
1330          * just fallback to pre-DoM policy if any OST is alive */
1331         mdtonly = true;
1332
1333         lod_getref(&lod->lod_ost_descs);
1334         lod_foreach_ost(lod, i) {
1335                 ost = OST_TGT(lod, i);
1336                 LASSERT(ost && ost->ltd_ost);
1337                 rc = dt_statfs(env, ost->ltd_ost, &ost_sfs);
1338                 /* ignore errors */
1339                 if (rc || ost_sfs.os_bsize == 0)
1340                         continue;
1341                 if (mdtonly) {
1342                         /* if only MDTs and DoM report MDT space,
1343                          * otherwise only OST space */
1344                         sfs->os_bavail = 0;
1345                         sfs->os_blocks = 0;
1346                         sfs->os_bfree = 0;
1347                         sfs->os_granted = 0;
1348                         mdtonly = false;
1349                 }
1350                 ost_sfs.os_bavail += ost_sfs.os_granted;
1351                 lod_statfs_sum(sfs, &ost_sfs, &bs);
1352                 LASSERTF(bs == ost_sfs.os_bsize, "%d != %d\n",
1353                         (int)sfs->os_bsize, (int)ost_sfs.os_bsize);
1354         }
1355         lod_putref(lod, &lod->lod_ost_descs);
1356         sfs->os_state |= OS_STATE_SUM;
1357
1358         /* a single successful statfs should be enough */
1359         rc = 0;
1360
1361 out:
1362         RETURN(rc);
1363 }
1364
1365 /**
1366  * Implementation of dt_device_operations::dt_trans_create() for LOD
1367  *
1368  * Creates a transaction using local (to this node) OSD.
1369  *
1370  * see include/dt_object.h for the details.
1371  */
1372 static struct thandle *lod_trans_create(const struct lu_env *env,
1373                                         struct dt_device *dt)
1374 {
1375         struct thandle *th;
1376
1377         th = top_trans_create(env, dt2lod_dev(dt)->lod_child);
1378         if (IS_ERR(th))
1379                 return th;
1380
1381         th->th_dev = dt;
1382
1383         return th;
1384 }
1385
1386 /**
1387  * Implementation of dt_device_operations::dt_trans_start() for LOD
1388  *
1389  * Starts the set of local transactions using the targets involved
1390  * in declare phase. Initial support for the distributed transactions.
1391  *
1392  * see include/dt_object.h for the details.
1393  */
1394 static int lod_trans_start(const struct lu_env *env, struct dt_device *dt,
1395                            struct thandle *th)
1396 {
1397         return top_trans_start(env, dt2lod_dev(dt)->lod_child, th);
1398 }
1399
1400 static int lod_trans_cb_add(struct thandle *th,
1401                             struct dt_txn_commit_cb *dcb)
1402 {
1403         struct top_thandle      *top_th = container_of(th, struct top_thandle,
1404                                                        tt_super);
1405         return dt_trans_cb_add(top_th->tt_master_sub_thandle, dcb);
1406 }
1407
1408 /**
1409  * add noop update to the update records
1410  *
1411  * Add noop updates to the update records, which is only used in
1412  * test right now.
1413  *
1414  * \param[in] env       execution environment
1415  * \param[in] dt        dt device of lod
1416  * \param[in] th        thandle
1417  * \param[in] count     the count of update records to be added.
1418  *
1419  * \retval              0 if adding succeeds.
1420  * \retval              negative errno if adding fails.
1421  */
1422 static int lod_add_noop_records(const struct lu_env *env,
1423                                 struct dt_device *dt, struct thandle *th,
1424                                 int count)
1425 {
1426         struct top_thandle *top_th;
1427         struct lu_fid *fid = &lod_env_info(env)->lti_fid;
1428         int i;
1429         int rc = 0;
1430
1431         top_th = container_of(th, struct top_thandle, tt_super);
1432         if (top_th->tt_multiple_thandle == NULL)
1433                 return 0;
1434
1435         fid_zero(fid);
1436         for (i = 0; i < count; i++) {
1437                 rc = update_record_pack(noop, th, fid);
1438                 if (rc < 0)
1439                         return rc;
1440         }
1441         return rc;
1442 }
1443
1444 /**
1445  * Implementation of dt_device_operations::dt_trans_stop() for LOD
1446  *
1447  * Stops the set of local transactions using the targets involved
1448  * in declare phase. Initial support for the distributed transactions.
1449  *
1450  * see include/dt_object.h for the details.
1451  */
1452 static int lod_trans_stop(const struct lu_env *env, struct dt_device *dt,
1453                           struct thandle *th)
1454 {
1455         if (OBD_FAIL_CHECK(OBD_FAIL_SPLIT_UPDATE_REC)) {
1456                 int rc;
1457
1458                 rc = lod_add_noop_records(env, dt, th, 5000);
1459                 if (rc < 0)
1460                         RETURN(rc);
1461         }
1462         return top_trans_stop(env, dt2lod_dev(dt)->lod_child, th);
1463 }
1464
1465 /**
1466  * Implementation of dt_device_operations::dt_conf_get() for LOD
1467  *
1468  * Currently returns the configuration provided by the local OSD.
1469  *
1470  * see include/dt_object.h for the details.
1471  */
1472 static void lod_conf_get(const struct lu_env *env,
1473                          const struct dt_device *dev,
1474                          struct dt_device_param *param)
1475 {
1476         dt_conf_get(env, dt2lod_dev((struct dt_device *)dev)->lod_child, param);
1477 }
1478
1479 /**
1480  * Implementation of dt_device_operations::dt_sync() for LOD
1481  *
1482  * Syncs all known OST targets. Very very expensive and used
1483  * rarely by LFSCK now. Should not be used in general.
1484  *
1485  * see include/dt_object.h for the details.
1486  */
1487 static int lod_sync(const struct lu_env *env, struct dt_device *dev)
1488 {
1489         struct lod_device   *lod = dt2lod_dev(dev);
1490         struct lod_ost_desc *ost;
1491         struct lod_mdt_desc *mdt;
1492         unsigned int         i;
1493         int                  rc = 0;
1494         ENTRY;
1495
1496         lod_getref(&lod->lod_ost_descs);
1497         lod_foreach_ost(lod, i) {
1498                 ost = OST_TGT(lod, i);
1499                 LASSERT(ost && ost->ltd_ost);
1500                 if (!ost->ltd_active)
1501                         continue;
1502                 rc = dt_sync(env, ost->ltd_ost);
1503                 if (rc) {
1504                         if (rc != -ENOTCONN) {
1505                                 CERROR("%s: can't sync ost %u: %d\n",
1506                                        lod2obd(lod)->obd_name, i, rc);
1507                                 break;
1508                         }
1509                         rc = 0;
1510                 }
1511         }
1512         lod_putref(lod, &lod->lod_ost_descs);
1513
1514         if (rc)
1515                 RETURN(rc);
1516
1517         lod_getref(&lod->lod_mdt_descs);
1518         lod_foreach_mdt(lod, i) {
1519                 mdt = MDT_TGT(lod, i);
1520                 LASSERT(mdt && mdt->ltd_mdt);
1521                 if (!mdt->ltd_active)
1522                         continue;
1523                 rc = dt_sync(env, mdt->ltd_mdt);
1524                 if (rc) {
1525                         if (rc != -ENOTCONN) {
1526                                 CERROR("%s: can't sync mdt %u: %d\n",
1527                                        lod2obd(lod)->obd_name, i, rc);
1528                                 break;
1529                         }
1530                         rc = 0;
1531                 }
1532         }
1533         lod_putref(lod, &lod->lod_mdt_descs);
1534
1535         if (rc == 0)
1536                 rc = dt_sync(env, lod->lod_child);
1537
1538         RETURN(rc);
1539 }
1540
1541 /**
1542  * Implementation of dt_device_operations::dt_ro() for LOD
1543  *
1544  * Turns local OSD read-only, used for the testing only.
1545  *
1546  * see include/dt_object.h for the details.
1547  */
1548 static int lod_ro(const struct lu_env *env, struct dt_device *dev)
1549 {
1550         return dt_ro(env, dt2lod_dev(dev)->lod_child);
1551 }
1552
1553 /**
1554  * Implementation of dt_device_operations::dt_commit_async() for LOD
1555  *
1556  * Asks local OSD to commit sooner.
1557  *
1558  * see include/dt_object.h for the details.
1559  */
1560 static int lod_commit_async(const struct lu_env *env, struct dt_device *dev)
1561 {
1562         return dt_commit_async(env, dt2lod_dev(dev)->lod_child);
1563 }
1564
1565 static const struct dt_device_operations lod_dt_ops = {
1566         .dt_root_get         = lod_root_get,
1567         .dt_statfs           = lod_statfs,
1568         .dt_trans_create     = lod_trans_create,
1569         .dt_trans_start      = lod_trans_start,
1570         .dt_trans_stop       = lod_trans_stop,
1571         .dt_conf_get         = lod_conf_get,
1572         .dt_sync             = lod_sync,
1573         .dt_ro               = lod_ro,
1574         .dt_commit_async     = lod_commit_async,
1575         .dt_trans_cb_add     = lod_trans_cb_add,
1576 };
1577
1578 /**
1579  * Connect to a local OSD.
1580  *
1581  * Used to connect to the local OSD at mount. OSD name is taken from the
1582  * configuration command passed. This connection is used to identify LU
1583  * site and pin the OSD from early removal.
1584  *
1585  * \param[in] env               LU environment provided by the caller
1586  * \param[in] lod               lod device
1587  * \param[in] cfg               configuration command to apply
1588  *
1589  * \retval 0                    on success
1590  * \retval negative             negated errno on error
1591  **/
1592 static int lod_connect_to_osd(const struct lu_env *env, struct lod_device *lod,
1593                               struct lustre_cfg *cfg)
1594 {
1595         struct obd_connect_data *data = NULL;
1596         struct obd_device       *obd;
1597         char                    *nextdev = NULL, *p, *s;
1598         int                      rc, len = 0;
1599         ENTRY;
1600
1601         LASSERT(cfg);
1602         LASSERT(lod->lod_child_exp == NULL);
1603
1604         /* compatibility hack: we still use old config logs
1605          * which specify LOV, but we need to learn underlying
1606          * OSD device, which is supposed to be:
1607          *  <fsname>-MDTxxxx-osd
1608          *
1609          * 2.x MGS generates lines like the following:
1610          *   #03 (176)lov_setup 0:lustre-MDT0000-mdtlov  1:(struct lov_desc)
1611          * 1.8 MGS generates lines like the following:
1612          *   #03 (168)lov_setup 0:lustre-mdtlov  1:(struct lov_desc)
1613          *
1614          * we use "-MDT" to differentiate 2.x from 1.8 */
1615
1616         if ((p = lustre_cfg_string(cfg, 0)) && strstr(p, "-mdtlov")) {
1617                 len = strlen(p) + 6;
1618                 OBD_ALLOC(nextdev, len);
1619                 if (nextdev == NULL)
1620                         GOTO(out, rc = -ENOMEM);
1621
1622                 strcpy(nextdev, p);
1623                 s = strstr(nextdev, "-mdtlov");
1624                 if (unlikely(s == NULL)) {
1625                         CERROR("unable to parse device name %s\n",
1626                                lustre_cfg_string(cfg, 0));
1627                         GOTO(out, rc = -EINVAL);
1628                 }
1629
1630                 if (strstr(nextdev, "-MDT")) {
1631                         /* 2.x config */
1632                         strcpy(s, "-osd");
1633                 } else {
1634                         /* 1.8 config */
1635                         strcpy(s, "-MDT0000-osd");
1636                 }
1637         } else {
1638                 CERROR("unable to parse device name %s\n",
1639                        lustre_cfg_string(cfg, 0));
1640                 GOTO(out, rc = -EINVAL);
1641         }
1642
1643         OBD_ALLOC_PTR(data);
1644         if (data == NULL)
1645                 GOTO(out, rc = -ENOMEM);
1646
1647         obd = class_name2obd(nextdev);
1648         if (obd == NULL) {
1649                 CERROR("can not locate next device: %s\n", nextdev);
1650                 GOTO(out, rc = -ENOTCONN);
1651         }
1652
1653         data->ocd_connect_flags = OBD_CONNECT_VERSION;
1654         data->ocd_version = LUSTRE_VERSION_CODE;
1655
1656         rc = obd_connect(env, &lod->lod_child_exp, obd, &obd->obd_uuid,
1657                          data, NULL);
1658         if (rc) {
1659                 CERROR("cannot connect to next dev %s (%d)\n", nextdev, rc);
1660                 GOTO(out, rc);
1661         }
1662
1663         lod->lod_dt_dev.dd_lu_dev.ld_site =
1664                 lod->lod_child_exp->exp_obd->obd_lu_dev->ld_site;
1665         LASSERT(lod->lod_dt_dev.dd_lu_dev.ld_site);
1666         lod->lod_child = lu2dt_dev(lod->lod_child_exp->exp_obd->obd_lu_dev);
1667
1668 out:
1669         if (data)
1670                 OBD_FREE_PTR(data);
1671         if (nextdev)
1672                 OBD_FREE(nextdev, len);
1673         RETURN(rc);
1674 }
1675
1676 /**
1677  * Allocate and initialize target table.
1678  *
1679  * A helper function to initialize the target table and allocate
1680  * a bitmap of the available targets.
1681  *
1682  * \param[in] ltd               target's table to initialize
1683  *
1684  * \retval 0                    on success
1685  * \retval negative             negated errno on error
1686  **/
1687 static int lod_tgt_desc_init(struct lod_tgt_descs *ltd)
1688 {
1689         mutex_init(&ltd->ltd_mutex);
1690         init_rwsem(&ltd->ltd_rw_sem);
1691
1692         /* the OST array and bitmap are allocated/grown dynamically as OSTs are
1693          * added to the LOD, see lod_add_device() */
1694         ltd->ltd_tgt_bitmap = CFS_ALLOCATE_BITMAP(32);
1695         if (ltd->ltd_tgt_bitmap == NULL)
1696                 RETURN(-ENOMEM);
1697
1698         ltd->ltd_tgts_size  = 32;
1699         ltd->ltd_tgtnr      = 0;
1700
1701         ltd->ltd_death_row = 0;
1702         ltd->ltd_refcount  = 0;
1703         return 0;
1704 }
1705
1706 /**
1707  * Initialize LOD device at setup.
1708  *
1709  * Initializes the given LOD device using the original configuration command.
1710  * The function initiates a connection to the local OSD and initializes few
1711  * internal structures like pools, target tables, etc.
1712  *
1713  * \param[in] env               LU environment provided by the caller
1714  * \param[in] lod               lod device
1715  * \param[in] ldt               not used
1716  * \param[in] cfg               configuration command
1717  *
1718  * \retval 0                    on success
1719  * \retval negative             negated errno on error
1720  **/
1721 static int lod_init0(const struct lu_env *env, struct lod_device *lod,
1722                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
1723 {
1724         struct dt_device_param ddp;
1725         struct obd_device     *obd;
1726         int                    rc;
1727         ENTRY;
1728
1729         obd = class_name2obd(lustre_cfg_string(cfg, 0));
1730         if (obd == NULL) {
1731                 CERROR("Cannot find obd with name %s\n",
1732                        lustre_cfg_string(cfg, 0));
1733                 RETURN(-ENODEV);
1734         }
1735
1736         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
1737         lod->lod_dt_dev.dd_lu_dev.ld_obd = obd;
1738         lod->lod_dt_dev.dd_lu_dev.ld_ops = &lod_lu_ops;
1739         lod->lod_dt_dev.dd_ops = &lod_dt_ops;
1740
1741         rc = lod_connect_to_osd(env, lod, cfg);
1742         if (rc)
1743                 RETURN(rc);
1744
1745         dt_conf_get(env, &lod->lod_dt_dev, &ddp);
1746         lod->lod_osd_max_easize = ddp.ddp_max_ea_size;
1747         lod->lod_dom_max_stripesize = (1ULL << 20); /* 1Mb as default value */
1748
1749         /* setup obd to be used with old lov code */
1750         rc = lod_pools_init(lod, cfg);
1751         if (rc)
1752                 GOTO(out_disconnect, rc);
1753
1754         rc = lod_procfs_init(lod);
1755         if (rc)
1756                 GOTO(out_pools, rc);
1757
1758         spin_lock_init(&lod->lod_lock);
1759         spin_lock_init(&lod->lod_connects_lock);
1760         lod_tgt_desc_init(&lod->lod_mdt_descs);
1761         lod_tgt_desc_init(&lod->lod_ost_descs);
1762
1763         RETURN(0);
1764
1765 out_pools:
1766         lod_pools_fini(lod);
1767 out_disconnect:
1768         obd_disconnect(lod->lod_child_exp);
1769         RETURN(rc);
1770 }
1771
1772 /**
1773  * Implementation of lu_device_type_operations::ldto_device_free() for LOD
1774  *
1775  * Releases the memory allocated for LOD device.
1776  *
1777  * see include/lu_object.h for the details.
1778  */
1779 static struct lu_device *lod_device_free(const struct lu_env *env,
1780                                          struct lu_device *lu)
1781 {
1782         struct lod_device *lod = lu2lod_dev(lu);
1783         struct lu_device  *next = &lod->lod_child->dd_lu_dev;
1784         ENTRY;
1785
1786         if (atomic_read(&lu->ld_ref) > 0 &&
1787             !cfs_hash_is_empty(lu->ld_site->ls_obj_hash)) {
1788                 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
1789                 lu_site_print(env, lu->ld_site, &msgdata, lu_cdebug_printer);
1790         }
1791         LASSERTF(atomic_read(&lu->ld_ref) == 0, "lu is %p\n", lu);
1792         dt_device_fini(&lod->lod_dt_dev);
1793         OBD_FREE_PTR(lod);
1794         RETURN(next);
1795 }
1796
1797 /**
1798  * Implementation of lu_device_type_operations::ldto_device_alloc() for LOD
1799  *
1800  * Allocates LOD device and calls the helpers to initialize it.
1801  *
1802  * see include/lu_object.h for the details.
1803  */
1804 static struct lu_device *lod_device_alloc(const struct lu_env *env,
1805                                           struct lu_device_type *type,
1806                                           struct lustre_cfg *lcfg)
1807 {
1808         struct lod_device *lod;
1809         struct lu_device  *lu_dev;
1810
1811         OBD_ALLOC_PTR(lod);
1812         if (lod == NULL) {
1813                 lu_dev = ERR_PTR(-ENOMEM);
1814         } else {
1815                 int rc;
1816
1817                 lu_dev = lod2lu_dev(lod);
1818                 dt_device_init(&lod->lod_dt_dev, type);
1819                 rc = lod_init0(env, lod, type, lcfg);
1820                 if (rc != 0) {
1821                         lod_device_free(env, lu_dev);
1822                         lu_dev = ERR_PTR(rc);
1823                 }
1824         }
1825
1826         return lu_dev;
1827 }
1828
1829 static void lod_avoid_guide_fini(struct lod_avoid_guide *lag)
1830 {
1831         if (lag->lag_oss_avoid_array)
1832                 OBD_FREE(lag->lag_oss_avoid_array,
1833                          sizeof(__u32) * lag->lag_oaa_size);
1834         if (lag->lag_ost_avoid_bitmap)
1835                 CFS_FREE_BITMAP(lag->lag_ost_avoid_bitmap);
1836 }
1837
1838 /**
1839  * Implementation of lu_device_type_operations::ldto_device_fini() for LOD
1840  *
1841  * Releases the internal resources used by LOD device.
1842  *
1843  * see include/lu_object.h for the details.
1844  */
1845 static struct lu_device *lod_device_fini(const struct lu_env *env,
1846                                          struct lu_device *d)
1847 {
1848         struct lod_device *lod = lu2lod_dev(d);
1849         int                rc;
1850         ENTRY;
1851
1852         lod_pools_fini(lod);
1853
1854         lod_procfs_fini(lod);
1855
1856         rc = lod_fini_tgt(env, lod, &lod->lod_ost_descs, true);
1857         if (rc)
1858                 CERROR("%s:can not fini ost descs %d\n",
1859                         lod2obd(lod)->obd_name, rc);
1860
1861         rc = lod_fini_tgt(env, lod, &lod->lod_mdt_descs, false);
1862         if (rc)
1863                 CERROR("%s:can not fini mdt descs %d\n",
1864                         lod2obd(lod)->obd_name, rc);
1865
1866         RETURN(NULL);
1867 }
1868
1869 /**
1870  * Implementation of obd_ops::o_connect() for LOD
1871  *
1872  * Used to track all the users of this specific LOD device,
1873  * so the device stays up until the last user disconnected.
1874  *
1875  * \param[in] env               LU environment provided by the caller
1876  * \param[out] exp              export the caller will be using to access LOD
1877  * \param[in] obd               OBD device representing LOD device
1878  * \param[in] cluuid            unique identifier of the caller
1879  * \param[in] data              not used
1880  * \param[in] localdata         not used
1881  *
1882  * \retval 0                    on success
1883  * \retval negative             negated errno on error
1884  **/
1885 static int lod_obd_connect(const struct lu_env *env, struct obd_export **exp,
1886                            struct obd_device *obd, struct obd_uuid *cluuid,
1887                            struct obd_connect_data *data, void *localdata)
1888 {
1889         struct lod_device    *lod = lu2lod_dev(obd->obd_lu_dev);
1890         struct lustre_handle  conn;
1891         int                   rc;
1892         ENTRY;
1893
1894         CDEBUG(D_CONFIG, "connect #%d\n", lod->lod_connects);
1895
1896         rc = class_connect(&conn, obd, cluuid);
1897         if (rc)
1898                 RETURN(rc);
1899
1900         *exp = class_conn2export(&conn);
1901
1902         spin_lock(&lod->lod_connects_lock);
1903         lod->lod_connects++;
1904         /* at the moment we expect the only user */
1905         LASSERT(lod->lod_connects == 1);
1906         spin_unlock(&lod->lod_connects_lock);
1907
1908         RETURN(0);
1909 }
1910
1911 /**
1912  *
1913  * Implementation of obd_ops::o_disconnect() for LOD
1914  *
1915  * When the caller doesn't need to use this LOD instance, it calls
1916  * obd_disconnect() and LOD releases corresponding export/reference count.
1917  * Once all the users gone, LOD device is released.
1918  *
1919  * \param[in] exp               export provided to the caller in obd_connect()
1920  *
1921  * \retval 0                    on success
1922  * \retval negative             negated errno on error
1923  **/
1924 static int lod_obd_disconnect(struct obd_export *exp)
1925 {
1926         struct obd_device *obd = exp->exp_obd;
1927         struct lod_device *lod = lu2lod_dev(obd->obd_lu_dev);
1928         int                rc, release = 0;
1929         ENTRY;
1930
1931         /* Only disconnect the underlying layers on the final disconnect. */
1932         spin_lock(&lod->lod_connects_lock);
1933         lod->lod_connects--;
1934         if (lod->lod_connects != 0) {
1935                 /* why should there be more than 1 connect? */
1936                 spin_unlock(&lod->lod_connects_lock);
1937                 CERROR("%s: disconnect #%d\n", exp->exp_obd->obd_name,
1938                        lod->lod_connects);
1939                 goto out;
1940         }
1941         spin_unlock(&lod->lod_connects_lock);
1942
1943         /* the last user of lod has gone, let's release the device */
1944         release = 1;
1945
1946 out:
1947         rc = class_disconnect(exp); /* bz 9811 */
1948
1949         if (rc == 0 && release)
1950                 class_manual_cleanup(obd);
1951         RETURN(rc);
1952 }
1953
1954 LU_KEY_INIT(lod, struct lod_thread_info);
1955
1956 static void lod_key_fini(const struct lu_context *ctx,
1957                 struct lu_context_key *key, void *data)
1958 {
1959         struct lod_thread_info *info = data;
1960         struct lod_layout_component *lds =
1961                                 info->lti_def_striping.lds_def_comp_entries;
1962
1963         /* allocated in lod_get_lov_ea
1964          * XXX: this is overload, a tread may have such store but used only
1965          * once. Probably better would be pool of such stores per LOD.
1966          */
1967         if (info->lti_ea_store) {
1968                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
1969                 info->lti_ea_store = NULL;
1970                 info->lti_ea_store_size = 0;
1971         }
1972         lu_buf_free(&info->lti_linkea_buf);
1973
1974         if (lds != NULL)
1975                 lod_free_def_comp_entries(&info->lti_def_striping);
1976
1977         if (info->lti_comp_size > 0)
1978                 OBD_FREE(info->lti_comp_idx,
1979                          info->lti_comp_size * sizeof(__u32));
1980
1981         lod_avoid_guide_fini(&info->lti_avoid);
1982
1983         OBD_FREE_PTR(info);
1984 }
1985
1986 /* context key: lod_thread_key */
1987 LU_CONTEXT_KEY_DEFINE(lod, LCT_MD_THREAD);
1988
1989 LU_TYPE_INIT_FINI(lod, &lod_thread_key);
1990
1991 static struct lu_device_type_operations lod_device_type_ops = {
1992         .ldto_init           = lod_type_init,
1993         .ldto_fini           = lod_type_fini,
1994
1995         .ldto_start          = lod_type_start,
1996         .ldto_stop           = lod_type_stop,
1997
1998         .ldto_device_alloc   = lod_device_alloc,
1999         .ldto_device_free    = lod_device_free,
2000
2001         .ldto_device_fini    = lod_device_fini
2002 };
2003
2004 static struct lu_device_type lod_device_type = {
2005         .ldt_tags     = LU_DEVICE_DT,
2006         .ldt_name     = LUSTRE_LOD_NAME,
2007         .ldt_ops      = &lod_device_type_ops,
2008         .ldt_ctx_tags = LCT_MD_THREAD,
2009 };
2010
2011 /**
2012  * Implementation of obd_ops::o_get_info() for LOD
2013  *
2014  * Currently, there is only one supported key: KEY_OSP_CONNECTED , to provide
2015  * the caller binary status whether LOD has seen connection to any OST target.
2016  * It will also check if the MDT update log context being initialized (if
2017  * needed).
2018  *
2019  * \param[in] env               LU environment provided by the caller
2020  * \param[in] exp               export of the caller
2021  * \param[in] keylen            len of the key
2022  * \param[in] key               the key
2023  * \param[in] vallen            not used
2024  * \param[in] val               not used
2025  *
2026  * \retval                      0 if a connection was seen
2027  * \retval                      -EAGAIN if LOD isn't running yet or no
2028  *                              connection has been seen yet
2029  * \retval                      -EINVAL if not supported key is requested
2030  **/
2031 static int lod_obd_get_info(const struct lu_env *env, struct obd_export *exp,
2032                             __u32 keylen, void *key, __u32 *vallen, void *val)
2033 {
2034         int rc = -EINVAL;
2035
2036         if (KEY_IS(KEY_OSP_CONNECTED)) {
2037                 struct obd_device       *obd = exp->exp_obd;
2038                 struct lod_device       *d;
2039                 struct lod_tgt_desc     *tgt;
2040                 unsigned int            i;
2041                 int                     rc = 1;
2042
2043                 if (!obd->obd_set_up || obd->obd_stopping)
2044                         RETURN(-EAGAIN);
2045
2046                 d = lu2lod_dev(obd->obd_lu_dev);
2047                 lod_getref(&d->lod_ost_descs);
2048                 lod_foreach_ost(d, i) {
2049                         tgt = OST_TGT(d, i);
2050                         LASSERT(tgt && tgt->ltd_tgt);
2051                         rc = obd_get_info(env, tgt->ltd_exp, keylen, key,
2052                                           vallen, val);
2053                         /* one healthy device is enough */
2054                         if (rc == 0)
2055                                 break;
2056                 }
2057                 lod_putref(d, &d->lod_ost_descs);
2058
2059                 lod_getref(&d->lod_mdt_descs);
2060                 lod_foreach_mdt(d, i) {
2061                         struct llog_ctxt *ctxt;
2062
2063                         tgt = MDT_TGT(d, i);
2064                         LASSERT(tgt != NULL);
2065                         LASSERT(tgt->ltd_tgt != NULL);
2066                         if (!tgt->ltd_active)
2067                                 continue;
2068
2069                         ctxt = llog_get_context(tgt->ltd_tgt->dd_lu_dev.ld_obd,
2070                                                 LLOG_UPDATELOG_ORIG_CTXT);
2071                         if (ctxt == NULL) {
2072                                 CDEBUG(D_INFO, "%s: %s is not ready.\n",
2073                                        obd->obd_name,
2074                                       tgt->ltd_tgt->dd_lu_dev.ld_obd->obd_name);
2075                                 rc = -EAGAIN;
2076                                 break;
2077                         }
2078                         if (ctxt->loc_handle == NULL) {
2079                                 CDEBUG(D_INFO, "%s: %s is not ready.\n",
2080                                        obd->obd_name,
2081                                       tgt->ltd_tgt->dd_lu_dev.ld_obd->obd_name);
2082                                 rc = -EAGAIN;
2083                                 llog_ctxt_put(ctxt);
2084                                 break;
2085                         }
2086                         llog_ctxt_put(ctxt);
2087                 }
2088                 lod_putref(d, &d->lod_mdt_descs);
2089
2090                 RETURN(rc);
2091         }
2092
2093         RETURN(rc);
2094 }
2095
2096 static int lod_obd_set_info_async(const struct lu_env *env,
2097                                   struct obd_export *exp,
2098                                   __u32 keylen, void *key,
2099                                   __u32 vallen, void *val,
2100                                   struct ptlrpc_request_set *set)
2101 {
2102         struct obd_device *obd = class_exp2obd(exp);
2103         struct lod_device *d;
2104         struct lod_tgt_desc *tgt;
2105         int no_set = 0;
2106         int i, rc = 0, rc2;
2107         ENTRY;
2108
2109         if (set == NULL) {
2110                 no_set = 1;
2111                 set = ptlrpc_prep_set();
2112                 if (!set)
2113                         RETURN(-ENOMEM);
2114         }
2115
2116         d = lu2lod_dev(obd->obd_lu_dev);
2117         lod_getref(&d->lod_ost_descs);
2118         lod_foreach_ost(d, i) {
2119                 tgt = OST_TGT(d, i);
2120                 LASSERT(tgt && tgt->ltd_tgt);
2121                 if (!tgt->ltd_active)
2122                         continue;
2123
2124                 rc2 = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
2125                                          vallen, val, set);
2126                 if (rc2 != 0 && rc == 0)
2127                         rc = rc2;
2128         }
2129         lod_putref(d, &d->lod_ost_descs);
2130
2131         lod_getref(&d->lod_mdt_descs);
2132         lod_foreach_mdt(d, i) {
2133                 tgt = MDT_TGT(d, i);
2134                 LASSERT(tgt && tgt->ltd_tgt);
2135                 if (!tgt->ltd_active)
2136                         continue;
2137                 rc2 = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
2138                                          vallen, val, set);
2139                 if (rc2 != 0 && rc == 0)
2140                         rc = rc2;
2141         }
2142         lod_putref(d, &d->lod_mdt_descs);
2143
2144
2145         if (no_set) {
2146                 rc2 = ptlrpc_set_wait(env, set);
2147                 if (rc2 == 0 && rc == 0)
2148                         rc = rc2;
2149                 ptlrpc_set_destroy(set);
2150         }
2151         RETURN(rc);
2152 }
2153
2154 static struct obd_ops lod_obd_device_ops = {
2155         .o_owner        = THIS_MODULE,
2156         .o_connect      = lod_obd_connect,
2157         .o_disconnect   = lod_obd_disconnect,
2158         .o_get_info     = lod_obd_get_info,
2159         .o_set_info_async = lod_obd_set_info_async,
2160         .o_pool_new     = lod_pool_new,
2161         .o_pool_rem     = lod_pool_remove,
2162         .o_pool_add     = lod_pool_add,
2163         .o_pool_del     = lod_pool_del,
2164 };
2165
2166 static struct obd_type sym;
2167
2168 static int __init lod_init(void)
2169 {
2170         struct dentry *symlink;
2171         struct obd_type *type;
2172         struct kobject *kobj;
2173         struct qstr dname;
2174         int rc;
2175
2176         rc = lu_kmem_init(lod_caches);
2177         if (rc)
2178                 return rc;
2179
2180         rc = class_register_type(&lod_obd_device_ops, NULL, true, NULL,
2181                                  LUSTRE_LOD_NAME, &lod_device_type);
2182         if (rc) {
2183                 lu_kmem_fini(lod_caches);
2184                 return rc;
2185         }
2186
2187         /* create "lov" entry for compatibility purposes */
2188         dname.name = "lov";
2189         dname.len = strlen(dname.name);
2190         dname.hash = ll_full_name_hash(debugfs_lustre_root, dname.name,
2191                                        dname.len);
2192         symlink = d_lookup(debugfs_lustre_root, &dname);
2193         if (!symlink) {
2194                 symlink = debugfs_create_dir(dname.name, debugfs_lustre_root);
2195                 if (IS_ERR_OR_NULL(symlink)) {
2196                         rc = symlink ? PTR_ERR(symlink) : -ENOMEM;
2197                         GOTO(no_lov, rc);
2198                 }
2199                 sym.typ_debugfs_entry = symlink;
2200         } else {
2201                 dput(symlink);
2202         }
2203
2204         kobj = kset_find_obj(lustre_kset, dname.name);
2205         if (kobj) {
2206                 kobject_put(kobj);
2207                 goto try_proc;
2208         }
2209
2210         kobj = class_setup_tunables(dname.name);
2211         if (IS_ERR(kobj)) {
2212                 rc = PTR_ERR(kobj);
2213                 if (sym.typ_debugfs_entry)
2214                         ldebugfs_remove(&sym.typ_debugfs_entry);
2215                 GOTO(no_lov, rc);
2216         }
2217         sym.typ_kobj = kobj;
2218
2219 try_proc:
2220         type = class_search_type(LUSTRE_LOV_NAME);
2221         if (type != NULL && type->typ_procroot != NULL)
2222                 GOTO(no_lov, rc);
2223
2224         type = class_search_type(LUSTRE_LOD_NAME);
2225         type->typ_procsym = lprocfs_register("lov", proc_lustre_root,
2226                                              NULL, NULL);
2227         if (IS_ERR(type->typ_procsym)) {
2228                 CERROR("lod: can't create compat entry \"lov\": %d\n",
2229                        (int)PTR_ERR(type->typ_procsym));
2230                 type->typ_procsym = NULL;
2231         }
2232 no_lov:
2233         return rc;
2234 }
2235
2236 static void __exit lod_exit(void)
2237 {
2238         ldebugfs_remove(&sym.typ_debugfs_entry);
2239         kobject_put(sym.typ_kobj);
2240         class_unregister_type(LUSTRE_LOD_NAME);
2241         lu_kmem_fini(lod_caches);
2242 }
2243
2244 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2245 MODULE_DESCRIPTION("Lustre Logical Object Device ("LUSTRE_LOD_NAME")");
2246 MODULE_VERSION(LUSTRE_VERSION_STRING);
2247 MODULE_LICENSE("GPL");
2248
2249 module_init(lod_init);
2250 module_exit(lod_exit);