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                 char *param;
 965
 966                 /* Check if it is activate/deactivate mdc
 967                  * lustre-MDTXXXX-osp-MDTXXXX.active=1 */
 968                 param = lustre_cfg_buf(lcfg, 1);
 969                 if (strstr(param, "osp") != NULL &&
 970                     strstr(param, ".active=") != NULL) {
 971                         struct lod_tgt_descs    *ltd = &lod->lod_mdt_descs;
 972                         struct lod_tgt_desc     *sub_tgt = NULL;
 973                         char *ptr;
 974                         char *tmp;
 975                         int i;
 976
 977                         ptr = strstr(param, ".");
 978                         *ptr = '\0';
 979                         obd = class_name2obd(param);
 980                         if (obd == NULL) {
 981                                 CERROR("%s: can not find %s: rc = %d\n",
 982                                        lod2obd(lod)->obd_name, param, -EINVAL);
 983                                 *ptr = '.';
 984                                 GOTO(out, rc);
 985                         }
 986
 987                         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 988                                 struct lod_tgt_desc *tgt;
 989
 990                                 tgt = LTD_TGT(ltd, i);
 991                                 if (tgt->ltd_tgt->dd_lu_dev.ld_obd == obd) {
 992                                         sub_tgt = tgt;
 993                                         break;
 994                                 }
 995                         }
 996
 997                         if (sub_tgt == NULL) {
 998                                 CERROR("%s: can not find %s: rc = %d\n",
 999                                        lod2obd(lod)->obd_name, param, -EINVAL);
1000                                 *ptr = '.';
1001                                 GOTO(out, rc);
1002                         }
1003
1004                         *ptr = '.';
1005                         tmp = strstr(param, "=");
1006                         tmp++;
1007                         if (*tmp == '1') {
1008                                 struct llog_ctxt *ctxt;
1009
1010                                 obd = sub_tgt->ltd_tgt->dd_lu_dev.ld_obd;
1011                                 ctxt = llog_get_context(obd,
1012                                                 LLOG_UPDATELOG_ORIG_CTXT);
1013                                 if (ctxt == NULL) {
1014                                         rc = llog_setup(env, obd, &obd->obd_olg,
1015                                                        LLOG_UPDATELOG_ORIG_CTXT,
1016                                                     NULL, &llog_common_cat_ops);
1017                                         if (rc < 0)
1018                                                 GOTO(out, rc);
1019                                 } else {
1020                                         llog_ctxt_put(ctxt);
1021                                 }
1022                                 rc = lod_sub_prep_llog(env, lod,
1023                                                        sub_tgt->ltd_tgt,
1024                                                        sub_tgt->ltd_index);
1025                                 if (rc == 0)
1026                                         sub_tgt->ltd_active = 1;
1027                         } else {
1028                                 lod_sub_fini_llog(env, sub_tgt->ltd_tgt,
1029                                                   NULL);
1030                                 sub_tgt->ltd_active = 0;
1031                         }
1032                         GOTO(out, rc);
1033                 }
1034
1035
1036                 obd = lod2obd(lod);
1037                 if (strstr(param, PARAM_LOD) != NULL)
1038                         rc = class_process_proc_param(PARAM_LOD, obd->obd_vars,
1039                                               lcfg, obd);
1040                 else
1041                         rc = class_process_proc_param(PARAM_LOV, obd->obd_vars,
1042                                               lcfg, obd);
1043                 if (rc > 0)
1044                         rc = 0;
1045
1046                 GOTO(out, rc);
1047         }
1048         case LCFG_PRE_CLEANUP: {
1049                 lod_sub_process_config(env, lod, &lod->lod_mdt_descs, lcfg);
1050                 lod_sub_process_config(env, lod, &lod->lod_ost_descs, lcfg);
1051                 next = &lod->lod_child->dd_lu_dev;
1052                 rc = next->ld_ops->ldo_process_config(env, next, lcfg);
1053                 if (rc != 0)
1054                         CDEBUG(D_HA, "%s: can't process %u: %d\n",
1055                                lod2obd(lod)->obd_name, lcfg->lcfg_command, rc);
1056
1057                 lod_sub_stop_recovery_threads(env, lod);
1058                 lod_fini_distribute_txn(env, lod);
1059                 lod_sub_fini_all_llogs(env, lod);
1060                 break;
1061         }
1062         case LCFG_CLEANUP: {
1063                 if (lod->lod_md_root != NULL) {
1064                         dt_object_put(env, &lod->lod_md_root->ldo_obj);
1065                         lod->lod_md_root = NULL;
1066                 }
1067
1068                 /*
1069                  * do cleanup on underlying storage only when
1070                  * all OSPs are cleaned up, as they use that OSD as well
1071                  */
1072                 lu_dev_del_linkage(dev->ld_site, dev);
1073                 lod_sub_process_config(env, lod, &lod->lod_mdt_descs, lcfg);
1074                 lod_sub_process_config(env, lod, &lod->lod_ost_descs, lcfg);
1075                 next = &lod->lod_child->dd_lu_dev;
1076                 rc = next->ld_ops->ldo_process_config(env, next, lcfg);
1077                 if (rc)
1078                         CERROR("%s: can't process %u: %d\n",
1079                                lod2obd(lod)->obd_name, lcfg->lcfg_command, rc);
1080
1081                 rc = obd_disconnect(lod->lod_child_exp);
1082                 if (rc)
1083                         CERROR("error in disconnect from storage: %d\n", rc);
1084                 break;
1085         }
1086         default:
1087                CERROR("%s: unknown command %u\n", lod2obd(lod)->obd_name,
1088                       lcfg->lcfg_command);
1089                rc = -EINVAL;
1090                break;
1091         }
1092
1093 out:
1094         RETURN(rc);
1095 }
1096
1097 /**
1098  * Implementation of lu_device_operations::ldo_recovery_complete() for LOD
1099  *
1100  * The method is called once the recovery is complete. This implementation
1101  * distributes the notification to all the known targets.
1102  *
1103  * see include/lu_object.h for the details
1104  */
1105 static int lod_recovery_complete(const struct lu_env *env,
1106                                  struct lu_device *dev)
1107 {
1108         struct lod_device   *lod = lu2lod_dev(dev);
1109         struct lu_device    *next = &lod->lod_child->dd_lu_dev;
1110         unsigned int         i;
1111         int                  rc;
1112         ENTRY;
1113
1114         LASSERT(lod->lod_recovery_completed == 0);
1115         lod->lod_recovery_completed = 1;
1116
1117         rc = next->ld_ops->ldo_recovery_complete(env, next);
1118
1119         lod_getref(&lod->lod_ost_descs);
1120         if (lod->lod_osts_size > 0) {
1121                 cfs_foreach_bit(lod->lod_ost_bitmap, i) {
1122                         struct lod_tgt_desc *tgt;
1123                         tgt = OST_TGT(lod, i);
1124                         LASSERT(tgt && tgt->ltd_tgt);
1125                         next = &tgt->ltd_ost->dd_lu_dev;
1126                         rc = next->ld_ops->ldo_recovery_complete(env, next);
1127                         if (rc)
1128                                 CERROR("%s: can't complete recovery on #%d:"
1129                                         "%d\n", lod2obd(lod)->obd_name, i, rc);
1130                 }
1131         }
1132         lod_putref(lod, &lod->lod_ost_descs);
1133         RETURN(rc);
1134 }
1135
1136 /**
1137  * Init update logs on all sub device
1138  *
1139  * LOD initialize update logs on all of sub devices. Because the initialization
1140  * process might need FLD lookup, see llog_osd_open()->dt_locate()->...->
1141  * lod_object_init(), this API has to be called after LOD is initialized.
1142  * \param[in] env       execution environment
1143  * \param[in] lod       lod device
1144  *
1145  * \retval              0 if update log is initialized successfully.
1146  * \retval              negative errno if initialization fails.
1147  */
1148 static int lod_sub_init_llogs(const struct lu_env *env, struct lod_device *lod)
1149 {
1150         struct lod_tgt_descs    *ltd = &lod->lod_mdt_descs;
1151         int                     rc;
1152         unsigned int            i;
1153         ENTRY;
1154
1155         /* llog must be setup after LOD is initialized, because llog
1156          * initialization include FLD lookup */
1157         LASSERT(lod->lod_initialized);
1158
1159         /* Init the llog in its own stack */
1160         rc = lod_sub_init_llog(env, lod, lod->lod_child);
1161         if (rc < 0)
1162                 RETURN(rc);
1163
1164         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
1165                 struct lod_tgt_desc     *tgt;
1166
1167                 tgt = LTD_TGT(ltd, i);
1168                 rc = lod_sub_init_llog(env, lod, tgt->ltd_tgt);
1169                 if (rc != 0)
1170                         break;
1171         }
1172
1173         RETURN(rc);
1174 }
1175
1176 /**
1177  * Implementation of lu_device_operations::ldo_prepare() for LOD
1178  *
1179  * see include/lu_object.h for the details.
1180  */
1181 static int lod_prepare(const struct lu_env *env, struct lu_device *pdev,
1182                        struct lu_device *cdev)
1183 {
1184         struct lod_device       *lod = lu2lod_dev(cdev);
1185         struct lu_device        *next = &lod->lod_child->dd_lu_dev;
1186         struct lu_fid           *fid = &lod_env_info(env)->lti_fid;
1187         int                     rc;
1188         struct dt_object        *root;
1189         struct dt_object        *dto;
1190         __u32                   index;
1191         ENTRY;
1192
1193         rc = next->ld_ops->ldo_prepare(env, pdev, next);
1194         if (rc != 0) {
1195                 CERROR("%s: prepare bottom error: rc = %d\n",
1196                        lod2obd(lod)->obd_name, rc);
1197                 RETURN(rc);
1198         }
1199
1200         lod->lod_initialized = 1;
1201
1202         rc = dt_root_get(env, lod->lod_child, fid);
1203         if (rc < 0)
1204                 RETURN(rc);
1205
1206         root = dt_locate(env, lod->lod_child, fid);
1207         if (IS_ERR(root))
1208                 RETURN(PTR_ERR(root));
1209
1210         /* Create update log object */
1211         index = lu_site2seq(lod2lu_dev(lod)->ld_site)->ss_node_id;
1212         lu_update_log_fid(fid, index);
1213
1214         dto = local_file_find_or_create_with_fid(env, lod->lod_child,
1215                                                  fid, root,
1216                                                  lod_update_log_name,
1217                                                  S_IFREG | S_IRUGO | S_IWUSR);
1218         if (IS_ERR(dto))
1219                 GOTO(out_put, rc = PTR_ERR(dto));
1220
1221         dt_object_put(env, dto);
1222
1223         /* Create update log dir */
1224         lu_update_log_dir_fid(fid, index);
1225         dto = local_file_find_or_create_with_fid(env, lod->lod_child,
1226                                                  fid, root,
1227                                                  lod_update_log_dir_name,
1228                                                  S_IFDIR | S_IRUGO | S_IWUSR);
1229         if (IS_ERR(dto))
1230                 GOTO(out_put, rc = PTR_ERR(dto));
1231
1232         dt_object_put(env, dto);
1233
1234         rc = lod_prepare_distribute_txn(env, lod);
1235         if (rc != 0)
1236                 GOTO(out_put, rc);
1237
1238         rc = lod_sub_init_llogs(env, lod);
1239         if (rc != 0)
1240                 GOTO(out_put, rc);
1241
1242 out_put:
1243         dt_object_put(env, root);
1244
1245         RETURN(rc);
1246 }
1247
1248 const struct lu_device_operations lod_lu_ops = {
1249         .ldo_object_alloc       = lod_object_alloc,
1250         .ldo_process_config     = lod_process_config,
1251         .ldo_recovery_complete  = lod_recovery_complete,
1252         .ldo_prepare            = lod_prepare,
1253 };
1254
1255 /**
1256  * Implementation of dt_device_operations::dt_root_get() for LOD
1257  *
1258  * see include/dt_object.h for the details.
1259  */
1260 static int lod_root_get(const struct lu_env *env,
1261                         struct dt_device *dev, struct lu_fid *f)
1262 {
1263         return dt_root_get(env, dt2lod_dev(dev)->lod_child, f);
1264 }
1265
1266 static void lod_statfs_sum(struct obd_statfs *sfs,
1267                              struct obd_statfs *ost_sfs, int *bs)
1268 {
1269         while (ost_sfs->os_bsize < *bs) {
1270                 *bs >>= 1;
1271                 sfs->os_bsize >>= 1;
1272                 sfs->os_bavail <<= 1;
1273                 sfs->os_blocks <<= 1;
1274                 sfs->os_bfree <<= 1;
1275                 sfs->os_granted <<= 1;
1276         }
1277         while (ost_sfs->os_bsize > *bs) {
1278                 ost_sfs->os_bsize >>= 1;
1279                 ost_sfs->os_bavail <<= 1;
1280                 ost_sfs->os_blocks <<= 1;
1281                 ost_sfs->os_bfree <<= 1;
1282                 ost_sfs->os_granted <<= 1;
1283         }
1284         sfs->os_bavail += ost_sfs->os_bavail;
1285         sfs->os_blocks += ost_sfs->os_blocks;
1286         sfs->os_bfree += ost_sfs->os_bfree;
1287         sfs->os_granted += ost_sfs->os_granted;
1288 }
1289
1290 /**
1291  * Implementation of dt_device_operations::dt_statfs() for LOD
1292  *
1293  * see include/dt_object.h for the details.
1294  */
1295 static int lod_statfs(const struct lu_env *env,
1296                       struct dt_device *dev, struct obd_statfs *sfs)
1297 {
1298         struct lod_device   *lod = dt2lod_dev(dev);
1299         struct lod_ost_desc *ost;
1300         struct lod_mdt_desc *mdt;
1301         struct obd_statfs    ost_sfs;
1302         int i, rc, bs;
1303         bool mdtonly;
1304
1305         rc = dt_statfs(env, dt2lod_dev(dev)->lod_child, sfs);
1306         if (rc)
1307                 GOTO(out, rc);
1308
1309         bs = sfs->os_bsize;
1310
1311         sfs->os_bavail = 0;
1312         sfs->os_blocks = 0;
1313         sfs->os_bfree = 0;
1314         sfs->os_granted = 0;
1315
1316         lod_getref(&lod->lod_mdt_descs);
1317         lod_foreach_mdt(lod, i) {
1318                 mdt = MDT_TGT(lod, i);
1319                 LASSERT(mdt && mdt->ltd_mdt);
1320                 rc = dt_statfs(env, mdt->ltd_mdt, &ost_sfs);
1321                 /* ignore errors */
1322                 if (rc)
1323                         continue;
1324                 sfs->os_files += ost_sfs.os_files;
1325                 sfs->os_ffree += ost_sfs.os_ffree;
1326                 lod_statfs_sum(sfs, &ost_sfs, &bs);
1327         }
1328         lod_putref(lod, &lod->lod_mdt_descs);
1329
1330         /* at some point we can check whether DoM is enabled and
1331          * decide how to account MDT space. for simplicity let's
1332          * just fallback to pre-DoM policy if any OST is alive */
1333         mdtonly = true;
1334
1335         lod_getref(&lod->lod_ost_descs);
1336         lod_foreach_ost(lod, i) {
1337                 ost = OST_TGT(lod, i);
1338                 LASSERT(ost && ost->ltd_ost);
1339                 rc = dt_statfs(env, ost->ltd_ost, &ost_sfs);
1340                 /* ignore errors */
1341                 if (rc || ost_sfs.os_bsize == 0)
1342                         continue;
1343                 if (mdtonly) {
1344                         /* if only MDTs and DoM report MDT space,
1345                          * otherwise only OST space */
1346                         sfs->os_bavail = 0;
1347                         sfs->os_blocks = 0;
1348                         sfs->os_bfree = 0;
1349                         sfs->os_granted = 0;
1350                         mdtonly = false;
1351                 }
1352                 ost_sfs.os_bavail += ost_sfs.os_granted;
1353                 lod_statfs_sum(sfs, &ost_sfs, &bs);
1354                 LASSERTF(bs == ost_sfs.os_bsize, "%d != %d\n",
1355                         (int)sfs->os_bsize, (int)ost_sfs.os_bsize);
1356         }
1357         lod_putref(lod, &lod->lod_ost_descs);
1358         sfs->os_state |= OS_STATE_SUM;
1359
1360         /* a single successful statfs should be enough */
1361         rc = 0;
1362
1363 out:
1364         RETURN(rc);
1365 }
1366
1367 /**
1368  * Implementation of dt_device_operations::dt_trans_create() for LOD
1369  *
1370  * Creates a transaction using local (to this node) OSD.
1371  *
1372  * see include/dt_object.h for the details.
1373  */
1374 static struct thandle *lod_trans_create(const struct lu_env *env,
1375                                         struct dt_device *dt)
1376 {
1377         struct thandle *th;
1378
1379         th = top_trans_create(env, dt2lod_dev(dt)->lod_child);
1380         if (IS_ERR(th))
1381                 return th;
1382
1383         th->th_dev = dt;
1384
1385         return th;
1386 }
1387
1388 /**
1389  * Implementation of dt_device_operations::dt_trans_start() for LOD
1390  *
1391  * Starts the set of local transactions using the targets involved
1392  * in declare phase. Initial support for the distributed transactions.
1393  *
1394  * see include/dt_object.h for the details.
1395  */
1396 static int lod_trans_start(const struct lu_env *env, struct dt_device *dt,
1397                            struct thandle *th)
1398 {
1399         return top_trans_start(env, dt2lod_dev(dt)->lod_child, th);
1400 }
1401
1402 static int lod_trans_cb_add(struct thandle *th,
1403                             struct dt_txn_commit_cb *dcb)
1404 {
1405         struct top_thandle      *top_th = container_of(th, struct top_thandle,
1406                                                        tt_super);
1407         return dt_trans_cb_add(top_th->tt_master_sub_thandle, dcb);
1408 }
1409
1410 /**
1411  * add noop update to the update records
1412  *
1413  * Add noop updates to the update records, which is only used in
1414  * test right now.
1415  *
1416  * \param[in] env       execution environment
1417  * \param[in] dt        dt device of lod
1418  * \param[in] th        thandle
1419  * \param[in] count     the count of update records to be added.
1420  *
1421  * \retval              0 if adding succeeds.
1422  * \retval              negative errno if adding fails.
1423  */
1424 static int lod_add_noop_records(const struct lu_env *env,
1425                                 struct dt_device *dt, struct thandle *th,
1426                                 int count)
1427 {
1428         struct top_thandle *top_th;
1429         struct lu_fid *fid = &lod_env_info(env)->lti_fid;
1430         int i;
1431         int rc = 0;
1432
1433         top_th = container_of(th, struct top_thandle, tt_super);
1434         if (top_th->tt_multiple_thandle == NULL)
1435                 return 0;
1436
1437         fid_zero(fid);
1438         for (i = 0; i < count; i++) {
1439                 rc = update_record_pack(noop, th, fid);
1440                 if (rc < 0)
1441                         return rc;
1442         }
1443         return rc;
1444 }
1445
1446 /**
1447  * Implementation of dt_device_operations::dt_trans_stop() for LOD
1448  *
1449  * Stops the set of local transactions using the targets involved
1450  * in declare phase. Initial support for the distributed transactions.
1451  *
1452  * see include/dt_object.h for the details.
1453  */
1454 static int lod_trans_stop(const struct lu_env *env, struct dt_device *dt,
1455                           struct thandle *th)
1456 {
1457         if (OBD_FAIL_CHECK(OBD_FAIL_SPLIT_UPDATE_REC)) {
1458                 int rc;
1459
1460                 rc = lod_add_noop_records(env, dt, th, 5000);
1461                 if (rc < 0)
1462                         RETURN(rc);
1463         }
1464         return top_trans_stop(env, dt2lod_dev(dt)->lod_child, th);
1465 }
1466
1467 /**
1468  * Implementation of dt_device_operations::dt_conf_get() for LOD
1469  *
1470  * Currently returns the configuration provided by the local OSD.
1471  *
1472  * see include/dt_object.h for the details.
1473  */
1474 static void lod_conf_get(const struct lu_env *env,
1475                          const struct dt_device *dev,
1476                          struct dt_device_param *param)
1477 {
1478         dt_conf_get(env, dt2lod_dev((struct dt_device *)dev)->lod_child, param);
1479 }
1480
1481 /**
1482  * Implementation of dt_device_operations::dt_sync() for LOD
1483  *
1484  * Syncs all known OST targets. Very very expensive and used
1485  * rarely by LFSCK now. Should not be used in general.
1486  *
1487  * see include/dt_object.h for the details.
1488  */
1489 static int lod_sync(const struct lu_env *env, struct dt_device *dev)
1490 {
1491         struct lod_device   *lod = dt2lod_dev(dev);
1492         struct lod_ost_desc *ost;
1493         struct lod_mdt_desc *mdt;
1494         unsigned int         i;
1495         int                  rc = 0;
1496         ENTRY;
1497
1498         lod_getref(&lod->lod_ost_descs);
1499         lod_foreach_ost(lod, i) {
1500                 ost = OST_TGT(lod, i);
1501                 LASSERT(ost && ost->ltd_ost);
1502                 if (!ost->ltd_active)
1503                         continue;
1504                 rc = dt_sync(env, ost->ltd_ost);
1505                 if (rc) {
1506                         if (rc != -ENOTCONN) {
1507                                 CERROR("%s: can't sync ost %u: %d\n",
1508                                        lod2obd(lod)->obd_name, i, rc);
1509                                 break;
1510                         }
1511                         rc = 0;
1512                 }
1513         }
1514         lod_putref(lod, &lod->lod_ost_descs);
1515
1516         if (rc)
1517                 RETURN(rc);
1518
1519         lod_getref(&lod->lod_mdt_descs);
1520         lod_foreach_mdt(lod, i) {
1521                 mdt = MDT_TGT(lod, i);
1522                 LASSERT(mdt && mdt->ltd_mdt);
1523                 if (!mdt->ltd_active)
1524                         continue;
1525                 rc = dt_sync(env, mdt->ltd_mdt);
1526                 if (rc) {
1527                         if (rc != -ENOTCONN) {
1528                                 CERROR("%s: can't sync mdt %u: %d\n",
1529                                        lod2obd(lod)->obd_name, i, rc);
1530                                 break;
1531                         }
1532                         rc = 0;
1533                 }
1534         }
1535         lod_putref(lod, &lod->lod_mdt_descs);
1536
1537         if (rc == 0)
1538                 rc = dt_sync(env, lod->lod_child);
1539
1540         RETURN(rc);
1541 }
1542
1543 /**
1544  * Implementation of dt_device_operations::dt_ro() for LOD
1545  *
1546  * Turns local OSD read-only, used for the testing only.
1547  *
1548  * see include/dt_object.h for the details.
1549  */
1550 static int lod_ro(const struct lu_env *env, struct dt_device *dev)
1551 {
1552         return dt_ro(env, dt2lod_dev(dev)->lod_child);
1553 }
1554
1555 /**
1556  * Implementation of dt_device_operations::dt_commit_async() for LOD
1557  *
1558  * Asks local OSD to commit sooner.
1559  *
1560  * see include/dt_object.h for the details.
1561  */
1562 static int lod_commit_async(const struct lu_env *env, struct dt_device *dev)
1563 {
1564         return dt_commit_async(env, dt2lod_dev(dev)->lod_child);
1565 }
1566
1567 static const struct dt_device_operations lod_dt_ops = {
1568         .dt_root_get         = lod_root_get,
1569         .dt_statfs           = lod_statfs,
1570         .dt_trans_create     = lod_trans_create,
1571         .dt_trans_start      = lod_trans_start,
1572         .dt_trans_stop       = lod_trans_stop,
1573         .dt_conf_get         = lod_conf_get,
1574         .dt_sync             = lod_sync,
1575         .dt_ro               = lod_ro,
1576         .dt_commit_async     = lod_commit_async,
1577         .dt_trans_cb_add     = lod_trans_cb_add,
1578 };
1579
1580 /**
1581  * Connect to a local OSD.
1582  *
1583  * Used to connect to the local OSD at mount. OSD name is taken from the
1584  * configuration command passed. This connection is used to identify LU
1585  * site and pin the OSD from early removal.
1586  *
1587  * \param[in] env               LU environment provided by the caller
1588  * \param[in] lod               lod device
1589  * \param[in] cfg               configuration command to apply
1590  *
1591  * \retval 0                    on success
1592  * \retval negative             negated errno on error
1593  **/
1594 static int lod_connect_to_osd(const struct lu_env *env, struct lod_device *lod,
1595                               struct lustre_cfg *cfg)
1596 {
1597         struct obd_connect_data *data = NULL;
1598         struct obd_device       *obd;
1599         char                    *nextdev = NULL, *p, *s;
1600         int                      rc, len = 0;
1601         ENTRY;
1602
1603         LASSERT(cfg);
1604         LASSERT(lod->lod_child_exp == NULL);
1605
1606         /* compatibility hack: we still use old config logs
1607          * which specify LOV, but we need to learn underlying
1608          * OSD device, which is supposed to be:
1609          *  <fsname>-MDTxxxx-osd
1610          *
1611          * 2.x MGS generates lines like the following:
1612          *   #03 (176)lov_setup 0:lustre-MDT0000-mdtlov  1:(struct lov_desc)
1613          * 1.8 MGS generates lines like the following:
1614          *   #03 (168)lov_setup 0:lustre-mdtlov  1:(struct lov_desc)
1615          *
1616          * we use "-MDT" to differentiate 2.x from 1.8 */
1617
1618         if ((p = lustre_cfg_string(cfg, 0)) && strstr(p, "-mdtlov")) {
1619                 len = strlen(p) + 6;
1620                 OBD_ALLOC(nextdev, len);
1621                 if (nextdev == NULL)
1622                         GOTO(out, rc = -ENOMEM);
1623
1624                 strcpy(nextdev, p);
1625                 s = strstr(nextdev, "-mdtlov");
1626                 if (unlikely(s == NULL)) {
1627                         CERROR("unable to parse device name %s\n",
1628                                lustre_cfg_string(cfg, 0));
1629                         GOTO(out, rc = -EINVAL);
1630                 }
1631
1632                 if (strstr(nextdev, "-MDT")) {
1633                         /* 2.x config */
1634                         strcpy(s, "-osd");
1635                 } else {
1636                         /* 1.8 config */
1637                         strcpy(s, "-MDT0000-osd");
1638                 }
1639         } else {
1640                 CERROR("unable to parse device name %s\n",
1641                        lustre_cfg_string(cfg, 0));
1642                 GOTO(out, rc = -EINVAL);
1643         }
1644
1645         OBD_ALLOC_PTR(data);
1646         if (data == NULL)
1647                 GOTO(out, rc = -ENOMEM);
1648
1649         obd = class_name2obd(nextdev);
1650         if (obd == NULL) {
1651                 CERROR("can not locate next device: %s\n", nextdev);
1652                 GOTO(out, rc = -ENOTCONN);
1653         }
1654
1655         data->ocd_connect_flags = OBD_CONNECT_VERSION;
1656         data->ocd_version = LUSTRE_VERSION_CODE;
1657
1658         rc = obd_connect(env, &lod->lod_child_exp, obd, &obd->obd_uuid,
1659                          data, NULL);
1660         if (rc) {
1661                 CERROR("cannot connect to next dev %s (%d)\n", nextdev, rc);
1662                 GOTO(out, rc);
1663         }
1664
1665         lod->lod_dt_dev.dd_lu_dev.ld_site =
1666                 lod->lod_child_exp->exp_obd->obd_lu_dev->ld_site;
1667         LASSERT(lod->lod_dt_dev.dd_lu_dev.ld_site);
1668         lod->lod_child = lu2dt_dev(lod->lod_child_exp->exp_obd->obd_lu_dev);
1669
1670 out:
1671         if (data)
1672                 OBD_FREE_PTR(data);
1673         if (nextdev)
1674                 OBD_FREE(nextdev, len);
1675         RETURN(rc);
1676 }
1677
1678 /**
1679  * Allocate and initialize target table.
1680  *
1681  * A helper function to initialize the target table and allocate
1682  * a bitmap of the available targets.
1683  *
1684  * \param[in] ltd               target's table to initialize
1685  *
1686  * \retval 0                    on success
1687  * \retval negative             negated errno on error
1688  **/
1689 static int lod_tgt_desc_init(struct lod_tgt_descs *ltd)
1690 {
1691         mutex_init(&ltd->ltd_mutex);
1692         init_rwsem(&ltd->ltd_rw_sem);
1693
1694         /* the OST array and bitmap are allocated/grown dynamically as OSTs are
1695          * added to the LOD, see lod_add_device() */
1696         ltd->ltd_tgt_bitmap = CFS_ALLOCATE_BITMAP(32);
1697         if (ltd->ltd_tgt_bitmap == NULL)
1698                 RETURN(-ENOMEM);
1699
1700         ltd->ltd_tgts_size  = 32;
1701         ltd->ltd_tgtnr      = 0;
1702
1703         ltd->ltd_death_row = 0;
1704         ltd->ltd_refcount  = 0;
1705         return 0;
1706 }
1707
1708 /**
1709  * Initialize LOD device at setup.
1710  *
1711  * Initializes the given LOD device using the original configuration command.
1712  * The function initiates a connection to the local OSD and initializes few
1713  * internal structures like pools, target tables, etc.
1714  *
1715  * \param[in] env               LU environment provided by the caller
1716  * \param[in] lod               lod device
1717  * \param[in] ldt               not used
1718  * \param[in] cfg               configuration command
1719  *
1720  * \retval 0                    on success
1721  * \retval negative             negated errno on error
1722  **/
1723 static int lod_init0(const struct lu_env *env, struct lod_device *lod,
1724                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
1725 {
1726         struct dt_device_param ddp;
1727         struct obd_device     *obd;
1728         int                    rc;
1729         ENTRY;
1730
1731         obd = class_name2obd(lustre_cfg_string(cfg, 0));
1732         if (obd == NULL) {
1733                 CERROR("Cannot find obd with name %s\n",
1734                        lustre_cfg_string(cfg, 0));
1735                 RETURN(-ENODEV);
1736         }
1737
1738         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
1739         lod->lod_dt_dev.dd_lu_dev.ld_obd = obd;
1740         lod->lod_dt_dev.dd_lu_dev.ld_ops = &lod_lu_ops;
1741         lod->lod_dt_dev.dd_ops = &lod_dt_ops;
1742
1743         rc = lod_connect_to_osd(env, lod, cfg);
1744         if (rc)
1745                 RETURN(rc);
1746
1747         dt_conf_get(env, &lod->lod_dt_dev, &ddp);
1748         lod->lod_osd_max_easize = ddp.ddp_max_ea_size;
1749         lod->lod_dom_max_stripesize = (1ULL << 20); /* 1Mb as default value */
1750
1751         /* setup obd to be used with old lov code */
1752         rc = lod_pools_init(lod, cfg);
1753         if (rc)
1754                 GOTO(out_disconnect, rc);
1755
1756         rc = lod_procfs_init(lod);
1757         if (rc)
1758                 GOTO(out_pools, rc);
1759
1760         spin_lock_init(&lod->lod_lock);
1761         spin_lock_init(&lod->lod_connects_lock);
1762         lod_tgt_desc_init(&lod->lod_mdt_descs);
1763         lod_tgt_desc_init(&lod->lod_ost_descs);
1764
1765         RETURN(0);
1766
1767 out_pools:
1768         lod_pools_fini(lod);
1769 out_disconnect:
1770         obd_disconnect(lod->lod_child_exp);
1771         RETURN(rc);
1772 }
1773
1774 /**
1775  * Implementation of lu_device_type_operations::ldto_device_free() for LOD
1776  *
1777  * Releases the memory allocated for LOD device.
1778  *
1779  * see include/lu_object.h for the details.
1780  */
1781 static struct lu_device *lod_device_free(const struct lu_env *env,
1782                                          struct lu_device *lu)
1783 {
1784         struct lod_device *lod = lu2lod_dev(lu);
1785         struct lu_device  *next = &lod->lod_child->dd_lu_dev;
1786         ENTRY;
1787
1788         if (atomic_read(&lu->ld_ref) > 0 &&
1789             !cfs_hash_is_empty(lu->ld_site->ls_obj_hash)) {
1790                 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
1791                 lu_site_print(env, lu->ld_site, &msgdata, lu_cdebug_printer);
1792         }
1793         LASSERTF(atomic_read(&lu->ld_ref) == 0, "lu is %p\n", lu);
1794         dt_device_fini(&lod->lod_dt_dev);
1795         OBD_FREE_PTR(lod);
1796         RETURN(next);
1797 }
1798
1799 /**
1800  * Implementation of lu_device_type_operations::ldto_device_alloc() for LOD
1801  *
1802  * Allocates LOD device and calls the helpers to initialize it.
1803  *
1804  * see include/lu_object.h for the details.
1805  */
1806 static struct lu_device *lod_device_alloc(const struct lu_env *env,
1807                                           struct lu_device_type *type,
1808                                           struct lustre_cfg *lcfg)
1809 {
1810         struct lod_device *lod;
1811         struct lu_device  *lu_dev;
1812
1813         OBD_ALLOC_PTR(lod);
1814         if (lod == NULL) {
1815                 lu_dev = ERR_PTR(-ENOMEM);
1816         } else {
1817                 int rc;
1818
1819                 lu_dev = lod2lu_dev(lod);
1820                 dt_device_init(&lod->lod_dt_dev, type);
1821                 rc = lod_init0(env, lod, type, lcfg);
1822                 if (rc != 0) {
1823                         lod_device_free(env, lu_dev);
1824                         lu_dev = ERR_PTR(rc);
1825                 }
1826         }
1827
1828         return lu_dev;
1829 }
1830
1831 static void lod_avoid_guide_fini(struct lod_avoid_guide *lag)
1832 {
1833         if (lag->lag_oss_avoid_array)
1834                 OBD_FREE(lag->lag_oss_avoid_array,
1835                          sizeof(__u32) * lag->lag_oaa_size);
1836         if (lag->lag_ost_avoid_bitmap)
1837                 CFS_FREE_BITMAP(lag->lag_ost_avoid_bitmap);
1838 }
1839
1840 /**
1841  * Implementation of lu_device_type_operations::ldto_device_fini() for LOD
1842  *
1843  * Releases the internal resources used by LOD device.
1844  *
1845  * see include/lu_object.h for the details.
1846  */
1847 static struct lu_device *lod_device_fini(const struct lu_env *env,
1848                                          struct lu_device *d)
1849 {
1850         struct lod_device *lod = lu2lod_dev(d);
1851         int                rc;
1852         ENTRY;
1853
1854         lod_pools_fini(lod);
1855
1856         lod_procfs_fini(lod);
1857
1858         rc = lod_fini_tgt(env, lod, &lod->lod_ost_descs, true);
1859         if (rc)
1860                 CERROR("%s:can not fini ost descs %d\n",
1861                         lod2obd(lod)->obd_name, rc);
1862
1863         rc = lod_fini_tgt(env, lod, &lod->lod_mdt_descs, false);
1864         if (rc)
1865                 CERROR("%s:can not fini mdt descs %d\n",
1866                         lod2obd(lod)->obd_name, rc);
1867
1868         RETURN(NULL);
1869 }
1870
1871 /**
1872  * Implementation of obd_ops::o_connect() for LOD
1873  *
1874  * Used to track all the users of this specific LOD device,
1875  * so the device stays up until the last user disconnected.
1876  *
1877  * \param[in] env               LU environment provided by the caller
1878  * \param[out] exp              export the caller will be using to access LOD
1879  * \param[in] obd               OBD device representing LOD device
1880  * \param[in] cluuid            unique identifier of the caller
1881  * \param[in] data              not used
1882  * \param[in] localdata         not used
1883  *
1884  * \retval 0                    on success
1885  * \retval negative             negated errno on error
1886  **/
1887 static int lod_obd_connect(const struct lu_env *env, struct obd_export **exp,
1888                            struct obd_device *obd, struct obd_uuid *cluuid,
1889                            struct obd_connect_data *data, void *localdata)
1890 {
1891         struct lod_device    *lod = lu2lod_dev(obd->obd_lu_dev);
1892         struct lustre_handle  conn;
1893         int                   rc;
1894         ENTRY;
1895
1896         CDEBUG(D_CONFIG, "connect #%d\n", lod->lod_connects);
1897
1898         rc = class_connect(&conn, obd, cluuid);
1899         if (rc)
1900                 RETURN(rc);
1901
1902         *exp = class_conn2export(&conn);
1903
1904         spin_lock(&lod->lod_connects_lock);
1905         lod->lod_connects++;
1906         /* at the moment we expect the only user */
1907         LASSERT(lod->lod_connects == 1);
1908         spin_unlock(&lod->lod_connects_lock);
1909
1910         RETURN(0);
1911 }
1912
1913 /**
1914  *
1915  * Implementation of obd_ops::o_disconnect() for LOD
1916  *
1917  * When the caller doesn't need to use this LOD instance, it calls
1918  * obd_disconnect() and LOD releases corresponding export/reference count.
1919  * Once all the users gone, LOD device is released.
1920  *
1921  * \param[in] exp               export provided to the caller in obd_connect()
1922  *
1923  * \retval 0                    on success
1924  * \retval negative             negated errno on error
1925  **/
1926 static int lod_obd_disconnect(struct obd_export *exp)
1927 {
1928         struct obd_device *obd = exp->exp_obd;
1929         struct lod_device *lod = lu2lod_dev(obd->obd_lu_dev);
1930         int                rc, release = 0;
1931         ENTRY;
1932
1933         /* Only disconnect the underlying layers on the final disconnect. */
1934         spin_lock(&lod->lod_connects_lock);
1935         lod->lod_connects--;
1936         if (lod->lod_connects != 0) {
1937                 /* why should there be more than 1 connect? */
1938                 spin_unlock(&lod->lod_connects_lock);
1939                 CERROR("%s: disconnect #%d\n", exp->exp_obd->obd_name,
1940                        lod->lod_connects);
1941                 goto out;
1942         }
1943         spin_unlock(&lod->lod_connects_lock);
1944
1945         /* the last user of lod has gone, let's release the device */
1946         release = 1;
1947
1948 out:
1949         rc = class_disconnect(exp); /* bz 9811 */
1950
1951         if (rc == 0 && release)
1952                 class_manual_cleanup(obd);
1953         RETURN(rc);
1954 }
1955
1956 LU_KEY_INIT(lod, struct lod_thread_info);
1957
1958 static void lod_key_fini(const struct lu_context *ctx,
1959                 struct lu_context_key *key, void *data)
1960 {
1961         struct lod_thread_info *info = data;
1962         struct lod_layout_component *lds =
1963                                 info->lti_def_striping.lds_def_comp_entries;
1964
1965         /* allocated in lod_get_lov_ea
1966          * XXX: this is overload, a tread may have such store but used only
1967          * once. Probably better would be pool of such stores per LOD.
1968          */
1969         if (info->lti_ea_store) {
1970                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
1971                 info->lti_ea_store = NULL;
1972                 info->lti_ea_store_size = 0;
1973         }
1974         lu_buf_free(&info->lti_linkea_buf);
1975
1976         if (lds != NULL)
1977                 lod_free_def_comp_entries(&info->lti_def_striping);
1978
1979         if (info->lti_comp_size > 0)
1980                 OBD_FREE(info->lti_comp_idx,
1981                          info->lti_comp_size * sizeof(__u32));
1982
1983         lod_avoid_guide_fini(&info->lti_avoid);
1984
1985         OBD_FREE_PTR(info);
1986 }
1987
1988 /* context key: lod_thread_key */
1989 LU_CONTEXT_KEY_DEFINE(lod, LCT_MD_THREAD);
1990
1991 LU_TYPE_INIT_FINI(lod, &lod_thread_key);
1992
1993 static struct lu_device_type_operations lod_device_type_ops = {
1994         .ldto_init           = lod_type_init,
1995         .ldto_fini           = lod_type_fini,
1996
1997         .ldto_start          = lod_type_start,
1998         .ldto_stop           = lod_type_stop,
1999
2000         .ldto_device_alloc   = lod_device_alloc,
2001         .ldto_device_free    = lod_device_free,
2002
2003         .ldto_device_fini    = lod_device_fini
2004 };
2005
2006 static struct lu_device_type lod_device_type = {
2007         .ldt_tags     = LU_DEVICE_DT,
2008         .ldt_name     = LUSTRE_LOD_NAME,
2009         .ldt_ops      = &lod_device_type_ops,
2010         .ldt_ctx_tags = LCT_MD_THREAD,
2011 };
2012
2013 /**
2014  * Implementation of obd_ops::o_get_info() for LOD
2015  *
2016  * Currently, there is only one supported key: KEY_OSP_CONNECTED , to provide
2017  * the caller binary status whether LOD has seen connection to any OST target.
2018  * It will also check if the MDT update log context being initialized (if
2019  * needed).
2020  *
2021  * \param[in] env               LU environment provided by the caller
2022  * \param[in] exp               export of the caller
2023  * \param[in] keylen            len of the key
2024  * \param[in] key               the key
2025  * \param[in] vallen            not used
2026  * \param[in] val               not used
2027  *
2028  * \retval                      0 if a connection was seen
2029  * \retval                      -EAGAIN if LOD isn't running yet or no
2030  *                              connection has been seen yet
2031  * \retval                      -EINVAL if not supported key is requested
2032  **/
2033 static int lod_obd_get_info(const struct lu_env *env, struct obd_export *exp,
2034                             __u32 keylen, void *key, __u32 *vallen, void *val)
2035 {
2036         int rc = -EINVAL;
2037
2038         if (KEY_IS(KEY_OSP_CONNECTED)) {
2039                 struct obd_device       *obd = exp->exp_obd;
2040                 struct lod_device       *d;
2041                 struct lod_tgt_desc     *tgt;
2042                 unsigned int            i;
2043                 int                     rc = 1;
2044
2045                 if (!obd->obd_set_up || obd->obd_stopping)
2046                         RETURN(-EAGAIN);
2047
2048                 d = lu2lod_dev(obd->obd_lu_dev);
2049                 lod_getref(&d->lod_ost_descs);
2050                 lod_foreach_ost(d, i) {
2051                         tgt = OST_TGT(d, i);
2052                         LASSERT(tgt && tgt->ltd_tgt);
2053                         rc = obd_get_info(env, tgt->ltd_exp, keylen, key,
2054                                           vallen, val);
2055                         /* one healthy device is enough */
2056                         if (rc == 0)
2057                                 break;
2058                 }
2059                 lod_putref(d, &d->lod_ost_descs);
2060
2061                 lod_getref(&d->lod_mdt_descs);
2062                 lod_foreach_mdt(d, i) {
2063                         struct llog_ctxt *ctxt;
2064
2065                         tgt = MDT_TGT(d, i);
2066                         LASSERT(tgt != NULL);
2067                         LASSERT(tgt->ltd_tgt != NULL);
2068                         if (!tgt->ltd_active)
2069                                 continue;
2070
2071                         ctxt = llog_get_context(tgt->ltd_tgt->dd_lu_dev.ld_obd,
2072                                                 LLOG_UPDATELOG_ORIG_CTXT);
2073                         if (ctxt == NULL) {
2074                                 CDEBUG(D_INFO, "%s: %s is not ready.\n",
2075                                        obd->obd_name,
2076                                       tgt->ltd_tgt->dd_lu_dev.ld_obd->obd_name);
2077                                 rc = -EAGAIN;
2078                                 break;
2079                         }
2080                         if (ctxt->loc_handle == NULL) {
2081                                 CDEBUG(D_INFO, "%s: %s is not ready.\n",
2082                                        obd->obd_name,
2083                                       tgt->ltd_tgt->dd_lu_dev.ld_obd->obd_name);
2084                                 rc = -EAGAIN;
2085                                 llog_ctxt_put(ctxt);
2086                                 break;
2087                         }
2088                         llog_ctxt_put(ctxt);
2089                 }
2090                 lod_putref(d, &d->lod_mdt_descs);
2091
2092                 RETURN(rc);
2093         }
2094
2095         RETURN(rc);
2096 }
2097
2098 static int lod_obd_set_info_async(const struct lu_env *env,
2099                                   struct obd_export *exp,
2100                                   __u32 keylen, void *key,
2101                                   __u32 vallen, void *val,
2102                                   struct ptlrpc_request_set *set)
2103 {
2104         struct obd_device *obd = class_exp2obd(exp);
2105         struct lod_device *d;
2106         struct lod_tgt_desc *tgt;
2107         int no_set = 0;
2108         int i, rc = 0, rc2;
2109         ENTRY;
2110
2111         if (set == NULL) {
2112                 no_set = 1;
2113                 set = ptlrpc_prep_set();
2114                 if (!set)
2115                         RETURN(-ENOMEM);
2116         }
2117
2118         d = lu2lod_dev(obd->obd_lu_dev);
2119         lod_getref(&d->lod_ost_descs);
2120         lod_foreach_ost(d, i) {
2121                 tgt = OST_TGT(d, i);
2122                 LASSERT(tgt && tgt->ltd_tgt);
2123                 if (!tgt->ltd_active)
2124                         continue;
2125
2126                 rc2 = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
2127                                          vallen, val, set);
2128                 if (rc2 != 0 && rc == 0)
2129                         rc = rc2;
2130         }
2131         lod_putref(d, &d->lod_ost_descs);
2132
2133         lod_getref(&d->lod_mdt_descs);
2134         lod_foreach_mdt(d, i) {
2135                 tgt = MDT_TGT(d, i);
2136                 LASSERT(tgt && tgt->ltd_tgt);
2137                 if (!tgt->ltd_active)
2138                         continue;
2139                 rc2 = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
2140                                          vallen, val, set);
2141                 if (rc2 != 0 && rc == 0)
2142                         rc = rc2;
2143         }
2144         lod_putref(d, &d->lod_mdt_descs);
2145
2146
2147         if (no_set) {
2148                 rc2 = ptlrpc_set_wait(env, set);
2149                 if (rc2 == 0 && rc == 0)
2150                         rc = rc2;
2151                 ptlrpc_set_destroy(set);
2152         }
2153         RETURN(rc);
2154 }
2155
2156 static struct obd_ops lod_obd_device_ops = {
2157         .o_owner        = THIS_MODULE,
2158         .o_connect      = lod_obd_connect,
2159         .o_disconnect   = lod_obd_disconnect,
2160         .o_get_info     = lod_obd_get_info,
2161         .o_set_info_async = lod_obd_set_info_async,
2162         .o_pool_new     = lod_pool_new,
2163         .o_pool_rem     = lod_pool_remove,
2164         .o_pool_add     = lod_pool_add,
2165         .o_pool_del     = lod_pool_del,
2166 };
2167
2168 static struct obd_type sym;
2169
2170 static int __init lod_init(void)
2171 {
2172         struct dentry *symlink;
2173         struct obd_type *type;
2174         struct kobject *kobj;
2175         struct qstr dname;
2176         int rc;
2177
2178         rc = lu_kmem_init(lod_caches);
2179         if (rc)
2180                 return rc;
2181
2182         rc = class_register_type(&lod_obd_device_ops, NULL, true, NULL,
2183                                  LUSTRE_LOD_NAME, &lod_device_type);
2184         if (rc) {
2185                 lu_kmem_fini(lod_caches);
2186                 return rc;
2187         }
2188
2189         /* create "lov" entry for compatibility purposes */
2190         dname.name = "lov";
2191         dname.len = strlen(dname.name);
2192         dname.hash = ll_full_name_hash(debugfs_lustre_root, dname.name,
2193                                        dname.len);
2194         symlink = d_lookup(debugfs_lustre_root, &dname);
2195         if (!symlink) {
2196                 symlink = debugfs_create_dir(dname.name, debugfs_lustre_root);
2197                 if (IS_ERR_OR_NULL(symlink)) {
2198                         rc = symlink ? PTR_ERR(symlink) : -ENOMEM;
2199                         GOTO(no_lov, rc);
2200                 }
2201                 sym.typ_debugfs_entry = symlink;
2202         } else {
2203                 dput(symlink);
2204         }
2205
2206         kobj = kset_find_obj(lustre_kset, dname.name);
2207         if (kobj) {
2208                 kobject_put(kobj);
2209                 goto try_proc;
2210         }
2211
2212         kobj = class_setup_tunables(dname.name);
2213         if (IS_ERR(kobj)) {
2214                 rc = PTR_ERR(kobj);
2215                 if (sym.typ_debugfs_entry)
2216                         ldebugfs_remove(&sym.typ_debugfs_entry);
2217                 GOTO(no_lov, rc);
2218         }
2219         sym.typ_kobj = kobj;
2220
2221 try_proc:
2222         type = class_search_type(LUSTRE_LOV_NAME);
2223         if (type != NULL && type->typ_procroot != NULL)
2224                 GOTO(no_lov, rc);
2225
2226         type = class_search_type(LUSTRE_LOD_NAME);
2227         type->typ_procsym = lprocfs_register("lov", proc_lustre_root,
2228                                              NULL, NULL);
2229         if (IS_ERR(type->typ_procsym)) {
2230                 CERROR("lod: can't create compat entry \"lov\": %d\n",
2231                        (int)PTR_ERR(type->typ_procsym));
2232                 type->typ_procsym = NULL;
2233         }
2234 no_lov:
2235         return rc;
2236 }
2237
2238 static void __exit lod_exit(void)
2239 {
2240         ldebugfs_remove(&sym.typ_debugfs_entry);
2241         kobject_put(sym.typ_kobj);
2242         class_unregister_type(LUSTRE_LOD_NAME);
2243         lu_kmem_fini(lod_caches);
2244 }
2245
2246 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2247 MODULE_DESCRIPTION("Lustre Logical Object Device ("LUSTRE_LOD_NAME")");
2248 MODULE_VERSION(LUSTRE_VERSION_STRING);
2249 MODULE_LICENSE("GPL");
2250
2251 module_init(lod_init);
2252 module_exit(lod_exit);