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, 2015, 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 <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: "LPX64"\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         lu_obj = lod2lu_obj(lod_obj);
 217         dt_object_init(&lod_obj->ldo_obj, NULL, dev);
 218         lod_obj->ldo_obj.do_ops = &lod_obj_ops;
 219         lu_obj->lo_ops = &lod_lu_obj_ops;
 220
 221         RETURN(lu_obj);
 222 }
 223
 224 /**
 225  * Process the config log for all sub device.
 226  *
 227  * The function goes through all the targets in the given table
 228  * and apply given configuration command on to the targets.
 229  * Used to cleanup the targets at unmount.
 230  *
 231  * \param[in] env               LU environment provided by the caller
 232  * \param[in] lod               lod device
 233  * \param[in] ltd               target's table to go through
 234  * \param[in] lcfg              configuration command to apply
 235  *
 236  * \retval 0                    on success
 237  * \retval negative             negated errno on error
 238  **/
 239 static int lod_sub_process_config(const struct lu_env *env,
 240                                  struct lod_device *lod,
 241                                  struct lod_tgt_descs *ltd,
 242                                  struct lustre_cfg *lcfg)
 243 {
 244         struct lu_device  *next;
 245         int rc = 0;
 246         unsigned int i;
 247
 248         lod_getref(ltd);
 249         if (ltd->ltd_tgts_size <= 0) {
 250                 lod_putref(lod, ltd);
 251                 return 0;
 252         }
 253         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 254                 struct lod_tgt_desc *tgt;
 255                 int rc1;
 256
 257                 tgt = LTD_TGT(ltd, i);
 258                 LASSERT(tgt && tgt->ltd_tgt);
 259                 next = &tgt->ltd_tgt->dd_lu_dev;
 260                 rc1 = next->ld_ops->ldo_process_config(env, next, lcfg);
 261                 if (rc1) {
 262                         CERROR("%s: error cleaning up LOD index %u: cmd %#x"
 263                                ": rc = %d\n", lod2obd(lod)->obd_name, i,
 264                                lcfg->lcfg_command, rc1);
 265                         rc = rc1;
 266                 }
 267         }
 268         lod_putref(lod, ltd);
 269         return rc;
 270 }
 271
 272 struct lod_recovery_data {
 273         struct lod_device       *lrd_lod;
 274         struct lod_tgt_desc     *lrd_ltd;
 275         struct ptlrpc_thread    *lrd_thread;
 276         __u32                   lrd_idx;
 277 };
 278
 279
 280 /**
 281  * process update recovery record
 282  *
 283  * Add the update recovery recode to the update recovery list in
 284  * lod_recovery_data. Then the recovery thread (target_recovery_thread)
 285  * will redo these updates.
 286  *
 287  * \param[in]env        execution environment
 288  * \param[in]llh        log handle of update record
 289  * \param[in]rec        update record to be replayed
 290  * \param[in]data       update recovery data which holds the necessary
 291  *                      arguments for recovery (see struct lod_recovery_data)
 292  *
 293  * \retval              0 if the record is processed successfully.
 294  * \retval              negative errno if the record processing fails.
 295  */
 296 static int lod_process_recovery_updates(const struct lu_env *env,
 297                                         struct llog_handle *llh,
 298                                         struct llog_rec_hdr *rec,
 299                                         void *data)
 300 {
 301         struct lod_recovery_data        *lrd = data;
 302         struct llog_cookie      *cookie = &lod_env_info(env)->lti_cookie;
 303         struct lu_target                *lut;
 304         __u32                           index = 0;
 305         ENTRY;
 306
 307         if (lrd->lrd_ltd == NULL) {
 308                 int rc;
 309
 310                 rc = lodname2mdt_index(lod2obd(lrd->lrd_lod)->obd_name, &index);
 311                 if (rc != 0)
 312                         return rc;
 313         } else {
 314                 index = lrd->lrd_ltd->ltd_index;
 315         }
 316
 317         if (rec->lrh_len !=
 318                 llog_update_record_size((struct llog_update_record *)rec)) {
 319                 CERROR("%s broken update record! index %u "DOSTID":%u :"
 320                        " rc = %d\n", lod2obd(lrd->lrd_lod)->obd_name, index,
 321                        POSTID(&llh->lgh_id.lgl_oi), rec->lrh_index, -EIO);
 322                 return -EINVAL;
 323         }
 324
 325         cookie->lgc_lgl = llh->lgh_id;
 326         cookie->lgc_index = rec->lrh_index;
 327         cookie->lgc_subsys = LLOG_UPDATELOG_ORIG_CTXT;
 328
 329         CDEBUG(D_HA, "%s: process recovery updates "DOSTID":%u\n",
 330                lod2obd(lrd->lrd_lod)->obd_name,
 331                POSTID(&llh->lgh_id.lgl_oi), rec->lrh_index);
 332         lut = lod2lu_dev(lrd->lrd_lod)->ld_site->ls_tgt;
 333
 334         if (lut->lut_obd->obd_stopping ||
 335             lut->lut_obd->obd_abort_recovery)
 336                 return -ESHUTDOWN;
 337
 338         return insert_update_records_to_replay_list(lut->lut_tdtd,
 339                                         (struct llog_update_record *)rec,
 340                                         cookie, index);
 341 }
 342
 343 /**
 344  * recovery thread for update log
 345  *
 346  * Start recovery thread and prepare the sub llog, then it will retrieve
 347  * the update records from the correpondent MDT and do recovery.
 348  *
 349  * \param[in] arg       pointer to the recovery data
 350  *
 351  * \retval              0 if recovery succeeds
 352  * \retval              negative errno if recovery failed.
 353  */
 354 static int lod_sub_recovery_thread(void *arg)
 355 {
 356         struct lod_recovery_data        *lrd = arg;
 357         struct lod_device               *lod = lrd->lrd_lod;
 358         struct dt_device                *dt;
 359         struct ptlrpc_thread            *thread = lrd->lrd_thread;
 360         struct llog_ctxt                *ctxt = NULL;
 361         struct lu_env                   env;
 362         struct lu_target *lut;
 363
 364
 365         int                             rc;
 366         ENTRY;
 367
 368         thread->t_flags = SVC_RUNNING;
 369         wake_up(&thread->t_ctl_waitq);
 370
 371         rc = lu_env_init(&env, LCT_LOCAL | LCT_MD_THREAD);
 372         if (rc != 0) {
 373                 OBD_FREE_PTR(lrd);
 374                 CERROR("%s: can't initialize env: rc = %d\n",
 375                        lod2obd(lod)->obd_name, rc);
 376                 RETURN(rc);
 377         }
 378
 379         lut = lod2lu_dev(lod)->ld_site->ls_tgt;
 380         atomic_inc(&lut->lut_tdtd->tdtd_recovery_threads_count);
 381         if (lrd->lrd_ltd == NULL)
 382                 dt = lod->lod_child;
 383         else
 384                 dt = lrd->lrd_ltd->ltd_tgt;
 385
 386 again:
 387         rc = lod_sub_prep_llog(&env, lod, dt, lrd->lrd_idx);
 388         if (rc == 0) {
 389                 /* Process the recovery record */
 390                 ctxt = llog_get_context(dt->dd_lu_dev.ld_obd,
 391                                         LLOG_UPDATELOG_ORIG_CTXT);
 392                 LASSERT(ctxt != NULL);
 393                 LASSERT(ctxt->loc_handle != NULL);
 394
 395                 rc = llog_cat_process(&env, ctxt->loc_handle,
 396                                       lod_process_recovery_updates, lrd, 0, 0);
 397         }
 398
 399         if (rc < 0) {
 400                 struct lu_device *top_device;
 401
 402                 top_device = lod->lod_dt_dev.dd_lu_dev.ld_site->ls_top_dev;
 403                 /* Because the remote target might failover at the same time,
 404                  * let's retry here */
 405                 if ((rc == -ETIMEDOUT || rc == -EAGAIN || rc == -EIO) &&
 406                      dt != lod->lod_child &&
 407                     !top_device->ld_obd->obd_abort_recovery &&
 408                     !top_device->ld_obd->obd_stopping) {
 409                         if (ctxt != NULL) {
 410                                 if (ctxt->loc_handle != NULL)
 411                                         llog_cat_close(&env,
 412                                                        ctxt->loc_handle);
 413                                 llog_ctxt_put(ctxt);
 414                         }
 415                         goto again;
 416                 }
 417
 418                 CERROR("%s getting update log failed: rc = %d\n",
 419                        dt->dd_lu_dev.ld_obd->obd_name, rc);
 420                 llog_ctxt_put(ctxt);
 421
 422                 spin_lock(&top_device->ld_obd->obd_dev_lock);
 423                 if (!top_device->ld_obd->obd_abort_recovery &&
 424                     !top_device->ld_obd->obd_stopping)
 425                         top_device->ld_obd->obd_abort_recovery = 1;
 426                 spin_unlock(&top_device->ld_obd->obd_dev_lock);
 427
 428                 GOTO(out, rc);
 429         }
 430         llog_ctxt_put(ctxt);
 431
 432         CDEBUG(D_HA, "%s retrieve update log: rc = %d\n",
 433                dt->dd_lu_dev.ld_obd->obd_name, rc);
 434
 435         if (lrd->lrd_ltd == NULL)
 436                 lod->lod_child_got_update_log = 1;
 437         else
 438                 lrd->lrd_ltd->ltd_got_update_log = 1;
 439
 440         if (lod->lod_child_got_update_log) {
 441                 struct lod_tgt_descs    *ltd = &lod->lod_mdt_descs;
 442                 struct lod_tgt_desc     *tgt = NULL;
 443                 bool                    all_got_log = true;
 444                 int                     i;
 445
 446                 cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 447                         tgt = LTD_TGT(ltd, i);
 448                         if (!tgt->ltd_got_update_log) {
 449                                 all_got_log = false;
 450                                 break;
 451                         }
 452                 }
 453
 454                 if (all_got_log) {
 455                         CDEBUG(D_HA, "%s got update logs from all MDTs.\n",
 456                                lut->lut_obd->obd_name);
 457                         lut->lut_tdtd->tdtd_replay_ready = 1;
 458                         wake_up(&lut->lut_obd->obd_next_transno_waitq);
 459                 }
 460         }
 461
 462 out:
 463         OBD_FREE_PTR(lrd);
 464         thread->t_flags = SVC_STOPPED;
 465         atomic_dec(&lut->lut_tdtd->tdtd_recovery_threads_count);
 466         wake_up(&lut->lut_tdtd->tdtd_recovery_threads_waitq);
 467         wake_up(&thread->t_ctl_waitq);
 468         lu_env_fini(&env);
 469         RETURN(rc);
 470 }
 471
 472 /**
 473  * finish sub llog context
 474  *
 475  * Stop update recovery thread for the sub device, then cleanup the
 476  * correspondent llog ctxt.
 477  *
 478  * \param[in] env      execution environment
 479  * \param[in] lod      lod device to do update recovery
 480  * \param[in] thread   recovery thread on this sub device
 481  */
 482 void lod_sub_fini_llog(const struct lu_env *env,
 483                        struct dt_device *dt, struct ptlrpc_thread *thread)
 484 {
 485         struct obd_device       *obd;
 486         struct llog_ctxt        *ctxt;
 487         ENTRY;
 488
 489         obd = dt->dd_lu_dev.ld_obd;
 490         CDEBUG(D_INFO, "%s: finish sub llog\n", obd->obd_name);
 491         /* Stop recovery thread first */
 492         if (thread != NULL && thread->t_flags & SVC_RUNNING) {
 493                 thread->t_flags = SVC_STOPPING;
 494                 wake_up(&thread->t_ctl_waitq);
 495                 wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
 496         }
 497
 498         ctxt = llog_get_context(obd, LLOG_UPDATELOG_ORIG_CTXT);
 499         if (ctxt == NULL)
 500                 RETURN_EXIT;
 501
 502         if (ctxt->loc_handle != NULL)
 503                 llog_cat_close(env, ctxt->loc_handle);
 504
 505         llog_cleanup(env, ctxt);
 506
 507         RETURN_EXIT;
 508 }
 509
 510 /**
 511  * Extract MDT target index from a device name.
 512  *
 513  * a helper function to extract index from the given device name
 514  * like "fsname-MDTxxxx-mdtlov"
 515  *
 516  * \param[in] lodname           device name
 517  * \param[out] mdt_index        extracted index
 518  *
 519  * \retval 0            on success
 520  * \retval -EINVAL      if the name is invalid
 521  */
 522 int lodname2mdt_index(char *lodname, __u32 *mdt_index)
 523 {
 524         unsigned long index;
 525         char *ptr, *tmp;
 526
 527         /* 1.8 configs don't have "-MDT0000" at the end */
 528         ptr = strstr(lodname, "-MDT");
 529         if (ptr == NULL) {
 530                 *mdt_index = 0;
 531                 return 0;
 532         }
 533
 534         ptr = strrchr(lodname, '-');
 535         if (ptr == NULL) {
 536                 CERROR("invalid MDT index in '%s'\n", lodname);
 537                 return -EINVAL;
 538         }
 539
 540         if (strncmp(ptr, "-mdtlov", 7) != 0) {
 541                 CERROR("invalid MDT index in '%s'\n", lodname);
 542                 return -EINVAL;
 543         }
 544
 545         if ((unsigned long)ptr - (unsigned long)lodname <= 8) {
 546                 CERROR("invalid MDT index in '%s'\n", lodname);
 547                 return -EINVAL;
 548         }
 549
 550         if (strncmp(ptr - 8, "-MDT", 4) != 0) {
 551                 CERROR("invalid MDT index in '%s'\n", lodname);
 552                 return -EINVAL;
 553         }
 554
 555         index = simple_strtol(ptr - 4, &tmp, 16);
 556         if (*tmp != '-' || index > INT_MAX) {
 557                 CERROR("invalid MDT index in '%s'\n", lodname);
 558                 return -EINVAL;
 559         }
 560         *mdt_index = index;
 561         return 0;
 562 }
 563
 564 /**
 565  * Init sub llog context
 566  *
 567  * Setup update llog ctxt for update recovery threads, then start the
 568  * recovery thread (lod_sub_recovery_thread) to read update llog from
 569  * the correspondent MDT to do update recovery.
 570  *
 571  * \param[in] env       execution environment
 572  * \param[in] lod       lod device to do update recovery
 573  * \param[in] dt        sub dt device for which the recovery thread is
 574  *
 575  * \retval              0 if initialization succeeds.
 576  * \retval              negative errno if initialization fails.
 577  */
 578 int lod_sub_init_llog(const struct lu_env *env, struct lod_device *lod,
 579                       struct dt_device *dt)
 580 {
 581         struct obd_device               *obd;
 582         struct lod_recovery_data        *lrd = NULL;
 583         struct ptlrpc_thread            *thread;
 584         struct task_struct              *task;
 585         struct l_wait_info              lwi = { 0 };
 586         struct lod_tgt_desc             *sub_ltd = NULL;
 587         __u32                           index;
 588         __u32                           master_index;
 589         int                             rc;
 590         ENTRY;
 591
 592         rc = lodname2mdt_index(lod2obd(lod)->obd_name, &master_index);
 593         if (rc != 0)
 594                 RETURN(rc);
 595
 596         OBD_ALLOC_PTR(lrd);
 597         if (lrd == NULL)
 598                 RETURN(-ENOMEM);
 599
 600         if (lod->lod_child == dt) {
 601                 thread = &lod->lod_child_recovery_thread;
 602                 index = master_index;
 603         } else {
 604                 struct lod_tgt_descs    *ltd = &lod->lod_mdt_descs;
 605                 struct lod_tgt_desc     *tgt = NULL;
 606                 unsigned int            i;
 607
 608                 cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 609                         tgt = LTD_TGT(ltd, i);
 610                         if (tgt->ltd_tgt == dt) {
 611                                 index = tgt->ltd_index;
 612                                 sub_ltd = tgt;
 613                                 break;
 614                         }
 615                 }
 616                 LASSERT(sub_ltd != NULL);
 617                 OBD_ALLOC_PTR(sub_ltd->ltd_recovery_thread);
 618                 if (sub_ltd->ltd_recovery_thread == NULL)
 619                         GOTO(free_lrd, rc = -ENOMEM);
 620
 621                 thread = sub_ltd->ltd_recovery_thread;
 622         }
 623
 624         CDEBUG(D_INFO, "%s init sub log %s\n", lod2obd(lod)->obd_name,
 625                dt->dd_lu_dev.ld_obd->obd_name);
 626         lrd->lrd_lod = lod;
 627         lrd->lrd_ltd = sub_ltd;
 628         lrd->lrd_thread = thread;
 629         lrd->lrd_idx = index;
 630         init_waitqueue_head(&thread->t_ctl_waitq);
 631
 632         obd = dt->dd_lu_dev.ld_obd;
 633         obd->obd_lvfs_ctxt.dt = dt;
 634         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_UPDATELOG_ORIG_CTXT,
 635                         NULL, &llog_common_cat_ops);
 636         if (rc < 0) {
 637                 CERROR("%s: cannot setup updatelog llog: rc = %d\n",
 638                        obd->obd_name, rc);
 639                 GOTO(free_thread, rc);
 640         }
 641
 642         /* Start the recovery thread */
 643         task = kthread_run(lod_sub_recovery_thread, lrd, "lod%04x_rec%04x",
 644                            master_index, index);
 645         if (IS_ERR(task)) {
 646                 rc = PTR_ERR(task);
 647                 CERROR("%s: cannot start recovery thread: rc = %d\n",
 648                        obd->obd_name, rc);
 649                 GOTO(out_llog, rc);
 650         }
 651
 652         l_wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_RUNNING ||
 653                                           thread->t_flags & SVC_STOPPED, &lwi);
 654
 655         RETURN(0);
 656 out_llog:
 657         lod_sub_fini_llog(env, dt, thread);
 658 free_thread:
 659         if (lod->lod_child != dt) {
 660                 OBD_FREE_PTR(sub_ltd->ltd_recovery_thread);
 661                 sub_ltd->ltd_recovery_thread = NULL;
 662         }
 663 free_lrd:
 664         OBD_FREE_PTR(lrd);
 665         RETURN(rc);
 666 }
 667
 668 /**
 669  * Stop sub recovery thread
 670  *
 671  * Stop sub recovery thread on all subs.
 672  *
 673  * \param[in] env       execution environment
 674  * \param[in] lod       lod device to do update recovery
 675  */
 676 static void lod_sub_stop_recovery_threads(const struct lu_env *env,
 677                                           struct lod_device *lod)
 678 {
 679         struct lod_tgt_descs *ltd = &lod->lod_mdt_descs;
 680         struct ptlrpc_thread    *thread;
 681         unsigned int i;
 682
 683         /* Stop the update log commit cancel threads and finish master
 684          * llog ctxt */
 685         thread = &lod->lod_child_recovery_thread;
 686         /* Stop recovery thread first */
 687         if (thread != NULL && thread->t_flags & SVC_RUNNING) {
 688                 thread->t_flags = SVC_STOPPING;
 689                 wake_up(&thread->t_ctl_waitq);
 690                 wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
 691         }
 692
 693         lod_getref(ltd);
 694         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 695                 struct lod_tgt_desc     *tgt;
 696
 697                 tgt = LTD_TGT(ltd, i);
 698                 thread = tgt->ltd_recovery_thread;
 699                 if (thread != NULL && thread->t_flags & SVC_RUNNING) {
 700                         thread->t_flags = SVC_STOPPING;
 701                         wake_up(&thread->t_ctl_waitq);
 702                         wait_event(thread->t_ctl_waitq,
 703                                    thread->t_flags & SVC_STOPPED);
 704                         OBD_FREE_PTR(tgt->ltd_recovery_thread);
 705                         tgt->ltd_recovery_thread = NULL;
 706                 }
 707         }
 708
 709         lod_putref(lod, ltd);
 710 }
 711
 712 /**
 713  * finish all sub llog
 714  *
 715  * cleanup all of sub llog ctxt on the LOD.
 716  *
 717  * \param[in] env       execution environment
 718  * \param[in] lod       lod device to do update recovery
 719  */
 720 static void lod_sub_fini_all_llogs(const struct lu_env *env,
 721                                    struct lod_device *lod)
 722 {
 723         struct lod_tgt_descs *ltd = &lod->lod_mdt_descs;
 724         unsigned int i;
 725
 726         /* Stop the update log commit cancel threads and finish master
 727          * llog ctxt */
 728         lod_sub_fini_llog(env, lod->lod_child,
 729                           &lod->lod_child_recovery_thread);
 730         lod_getref(ltd);
 731         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 732                 struct lod_tgt_desc     *tgt;
 733
 734                 tgt = LTD_TGT(ltd, i);
 735                 lod_sub_fini_llog(env, tgt->ltd_tgt,
 736                                   tgt->ltd_recovery_thread);
 737         }
 738
 739         lod_putref(lod, ltd);
 740 }
 741
 742 /**
 743  * Prepare distribute txn
 744  *
 745  * Prepare distribute txn structure for LOD
 746  *
 747  * \param[in] env       execution environment
 748  * \param[in] lod_device  LOD device
 749  *
 750  * \retval              0 if preparation succeeds.
 751  * \retval              negative errno if preparation fails.
 752  */
 753 static int lod_prepare_distribute_txn(const struct lu_env *env,
 754                                       struct lod_device *lod)
 755 {
 756         struct target_distribute_txn_data *tdtd;
 757         struct lu_target                  *lut;
 758         int                               rc;
 759         ENTRY;
 760
 761         /* Init update recovery data */
 762         OBD_ALLOC_PTR(tdtd);
 763         if (tdtd == NULL)
 764                 RETURN(-ENOMEM);
 765
 766         lut = lod2lu_dev(lod)->ld_site->ls_tgt;
 767         tdtd->tdtd_dt = &lod->lod_dt_dev;
 768         rc = distribute_txn_init(env, lut, tdtd,
 769                 lu_site2seq(lod2lu_dev(lod)->ld_site)->ss_node_id);
 770
 771         if (rc < 0) {
 772                 CERROR("%s: cannot init distribute txn: rc = %d\n",
 773                        lod2obd(lod)->obd_name, rc);
 774                 OBD_FREE_PTR(tdtd);
 775                 RETURN(rc);
 776         }
 777
 778         lut->lut_tdtd = tdtd;
 779
 780         RETURN(0);
 781 }
 782
 783 /**
 784  * Finish distribute txn
 785  *
 786  * Release the resource holding by distribute txn, i.e. stop distribute
 787  * txn thread.
 788  *
 789  * \param[in] env       execution environment
 790  * \param[in] lod       lod device
 791  */
 792 static void lod_fini_distribute_txn(const struct lu_env *env,
 793                                     struct lod_device *lod)
 794 {
 795         struct lu_target                  *lut;
 796
 797         lut = lod2lu_dev(lod)->ld_site->ls_tgt;
 798         if (lut->lut_tdtd == NULL)
 799                 return;
 800
 801         distribute_txn_fini(env, lut->lut_tdtd);
 802
 803         OBD_FREE_PTR(lut->lut_tdtd);
 804         lut->lut_tdtd = NULL;
 805 }
 806
 807 /**
 808  * Implementation of lu_device_operations::ldo_process_config() for LOD
 809  *
 810  * The method is called by the configuration subsystem during setup,
 811  * cleanup and when the configuration changes. The method processes
 812  * few specific commands like adding/removing the targets, changing
 813  * the runtime parameters.
 814
 815  * \param[in] env               LU environment provided by the caller
 816  * \param[in] dev               lod device
 817  * \param[in] lcfg              configuration command to apply
 818  *
 819  * \retval 0                    on success
 820  * \retval negative             negated errno on error
 821  *
 822  * The examples are below.
 823  *
 824  * Add osc config log:
 825  * marker  20 (flags=0x01, v2.2.49.56) lustre-OST0001  'add osc'
 826  * add_uuid  nid=192.168.122.162@tcp(0x20000c0a87aa2)  0:  1:nidxxx
 827  * attach    0:lustre-OST0001-osc-MDT0001  1:osc  2:lustre-MDT0001-mdtlov_UUID
 828  * setup     0:lustre-OST0001-osc-MDT0001  1:lustre-OST0001_UUID  2:nid
 829  * lov_modify_tgts add 0:lustre-MDT0001-mdtlov  1:lustre-OST0001_UUID  2:1  3:1
 830  * marker  20 (flags=0x02, v2.2.49.56) lustre-OST0001  'add osc'
 831  *
 832  * Add mdc config log:
 833  * marker  10 (flags=0x01, v2.2.49.56) lustre-MDT0000  'add osp'
 834  * add_uuid  nid=192.168.122.162@tcp(0x20000c0a87aa2)  0:  1:nid
 835  * attach 0:lustre-MDT0000-osp-MDT0001  1:osp  2:lustre-MDT0001-mdtlov_UUID
 836  * setup     0:lustre-MDT0000-osp-MDT0001  1:lustre-MDT0000_UUID  2:nid
 837  * modify_mdc_tgts add 0:lustre-MDT0001  1:lustre-MDT0000_UUID  2:0  3:1
 838  * marker  10 (flags=0x02, v2.2.49.56) lustre-MDT0000_UUID  'add osp'
 839  */
 840 static int lod_process_config(const struct lu_env *env,
 841                               struct lu_device *dev,
 842                               struct lustre_cfg *lcfg)
 843 {
 844         struct lod_device *lod = lu2lod_dev(dev);
 845         struct lu_device  *next = &lod->lod_child->dd_lu_dev;
 846         char              *arg1;
 847         int                rc = 0;
 848         ENTRY;
 849
 850         switch(lcfg->lcfg_command) {
 851         case LCFG_LOV_DEL_OBD:
 852         case LCFG_LOV_ADD_INA:
 853         case LCFG_LOV_ADD_OBD:
 854         case LCFG_ADD_MDC: {
 855                 __u32 index;
 856                 __u32 mdt_index;
 857                 int gen;
 858                 /* lov_modify_tgts add  0:lov_mdsA  1:osp  2:0  3:1
 859                  * modify_mdc_tgts add  0:lustre-MDT0001
 860                  *                    1:lustre-MDT0001-mdc0002
 861                  *                    2:2  3:1*/
 862                 arg1 = lustre_cfg_string(lcfg, 1);
 863
 864                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%d", &index) != 1)
 865                         GOTO(out, rc = -EINVAL);
 866                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
 867                         GOTO(out, rc = -EINVAL);
 868
 869                 if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD) {
 870                         __u32 mdt_index;
 871
 872                         rc = lodname2mdt_index(lustre_cfg_string(lcfg, 0),
 873                                                &mdt_index);
 874                         if (rc != 0)
 875                                 GOTO(out, rc);
 876
 877                         rc = lod_add_device(env, lod, arg1, index, gen,
 878                                             mdt_index, LUSTRE_OSC_NAME, 1);
 879                 } else if (lcfg->lcfg_command == LCFG_ADD_MDC) {
 880                         mdt_index = index;
 881                         rc = lod_add_device(env, lod, arg1, index, gen,
 882                                             mdt_index, LUSTRE_MDC_NAME, 1);
 883                 } else if (lcfg->lcfg_command == LCFG_LOV_ADD_INA) {
 884                         /*FIXME: Add mdt_index for LCFG_LOV_ADD_INA*/
 885                         mdt_index = 0;
 886                         rc = lod_add_device(env, lod, arg1, index, gen,
 887                                             mdt_index, LUSTRE_OSC_NAME, 0);
 888                 } else {
 889                         rc = lod_del_device(env, lod,
 890                                             &lod->lod_ost_descs,
 891                                             arg1, index, gen, true);
 892                 }
 893
 894                 break;
 895         }
 896
 897         case LCFG_PARAM: {
 898                 struct obd_device *obd;
 899                 char *param;
 900
 901                 /* Check if it is activate/deactivate mdc
 902                  * lustre-MDTXXXX-osp-MDTXXXX.active=1 */
 903                 param = lustre_cfg_buf(lcfg, 1);
 904                 if (strstr(param, "osp") != NULL &&
 905                     strstr(param, ".active=") != NULL) {
 906                         struct lod_tgt_descs    *ltd = &lod->lod_mdt_descs;
 907                         struct lod_tgt_desc     *sub_tgt = NULL;
 908                         char *ptr;
 909                         char *tmp;
 910                         int i;
 911
 912                         ptr = strstr(param, ".");
 913                         *ptr = '\0';
 914                         obd = class_name2obd(param);
 915                         if (obd == NULL) {
 916                                 CERROR("%s: can not find %s: rc = %d\n",
 917                                        lod2obd(lod)->obd_name, param, -EINVAL);
 918                                 *ptr = '.';
 919                                 GOTO(out, rc);
 920                         }
 921
 922                         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
 923                                 struct lod_tgt_desc *tgt;
 924
 925                                 tgt = LTD_TGT(ltd, i);
 926                                 if (tgt->ltd_tgt->dd_lu_dev.ld_obd == obd) {
 927                                         sub_tgt = tgt;
 928                                         break;
 929                                 }
 930                         }
 931
 932                         if (sub_tgt == NULL) {
 933                                 CERROR("%s: can not find %s: rc = %d\n",
 934                                        lod2obd(lod)->obd_name, param, -EINVAL);
 935                                 *ptr = '.';
 936                                 GOTO(out, rc);
 937                         }
 938
 939                         *ptr = '.';
 940                         tmp = strstr(param, "=");
 941                         tmp++;
 942                         if (*tmp == '1') {
 943                                 struct llog_ctxt *ctxt;
 944
 945                                 obd = sub_tgt->ltd_tgt->dd_lu_dev.ld_obd;
 946                                 ctxt = llog_get_context(obd,
 947                                                 LLOG_UPDATELOG_ORIG_CTXT);
 948                                 if (ctxt == NULL) {
 949                                         rc = llog_setup(env, obd, &obd->obd_olg,
 950                                                        LLOG_UPDATELOG_ORIG_CTXT,
 951                                                     NULL, &llog_common_cat_ops);
 952                                         if (rc < 0)
 953                                                 GOTO(out, rc);
 954                                 } else {
 955                                         llog_ctxt_put(ctxt);
 956                                 }
 957                                 rc = lod_sub_prep_llog(env, lod,
 958                                                        sub_tgt->ltd_tgt,
 959                                                        sub_tgt->ltd_index);
 960                                 if (rc == 0)
 961                                         sub_tgt->ltd_active = 1;
 962                         } else {
 963                                 lod_sub_fini_llog(env, sub_tgt->ltd_tgt,
 964                                                   NULL);
 965                                 sub_tgt->ltd_active = 0;
 966                         }
 967                         GOTO(out, rc);
 968                 }
 969
 970                 obd = lod2obd(lod);
 971                 rc = class_process_proc_param(PARAM_LOV, obd->obd_vars,
 972                                               lcfg, obd);
 973                 if (rc > 0)
 974                         rc = 0;
 975                 GOTO(out, rc);
 976         }
 977         case LCFG_PRE_CLEANUP: {
 978                 if (lod->lod_md_root != NULL) {
 979                         lu_object_put(env, &lod->lod_md_root->ldo_obj.do_lu);
 980                         lod->lod_md_root = NULL;
 981                 }
 982
 983                 lod_sub_process_config(env, lod, &lod->lod_mdt_descs, lcfg);
 984                 lod_sub_process_config(env, lod, &lod->lod_ost_descs, lcfg);
 985                 next = &lod->lod_child->dd_lu_dev;
 986                 rc = next->ld_ops->ldo_process_config(env, next, lcfg);
 987                 if (rc != 0)
 988                         CDEBUG(D_HA, "%s: can't process %u: %d\n",
 989                                lod2obd(lod)->obd_name, lcfg->lcfg_command, rc);
 990
 991                 lod_sub_stop_recovery_threads(env, lod);
 992                 lod_fini_distribute_txn(env, lod);
 993                 lod_sub_fini_all_llogs(env, lod);
 994                 break;
 995         }
 996         case LCFG_CLEANUP: {
 997                 /*
 998                  * do cleanup on underlying storage only when
 999                  * all OSPs are cleaned up, as they use that OSD as well
1000                  */
1001                 lu_dev_del_linkage(dev->ld_site, dev);
1002                 lod_sub_process_config(env, lod, &lod->lod_mdt_descs, lcfg);
1003                 lod_sub_process_config(env, lod, &lod->lod_ost_descs, lcfg);
1004                 next = &lod->lod_child->dd_lu_dev;
1005                 rc = next->ld_ops->ldo_process_config(env, next, lcfg);
1006                 if (rc)
1007                         CERROR("%s: can't process %u: %d\n",
1008                                lod2obd(lod)->obd_name, lcfg->lcfg_command, rc);
1009
1010                 rc = obd_disconnect(lod->lod_child_exp);
1011                 if (rc)
1012                         CERROR("error in disconnect from storage: %d\n", rc);
1013                 break;
1014         }
1015         default:
1016                CERROR("%s: unknown command %u\n", lod2obd(lod)->obd_name,
1017                       lcfg->lcfg_command);
1018                rc = -EINVAL;
1019                break;
1020         }
1021
1022 out:
1023         RETURN(rc);
1024 }
1025
1026 /**
1027  * Implementation of lu_device_operations::ldo_recovery_complete() for LOD
1028  *
1029  * The method is called once the recovery is complete. This implementation
1030  * distributes the notification to all the known targets.
1031  *
1032  * see include/lu_object.h for the details
1033  */
1034 static int lod_recovery_complete(const struct lu_env *env,
1035                                  struct lu_device *dev)
1036 {
1037         struct lod_device   *lod = lu2lod_dev(dev);
1038         struct lu_device    *next = &lod->lod_child->dd_lu_dev;
1039         unsigned int         i;
1040         int                  rc;
1041         ENTRY;
1042
1043         LASSERT(lod->lod_recovery_completed == 0);
1044         lod->lod_recovery_completed = 1;
1045
1046         rc = next->ld_ops->ldo_recovery_complete(env, next);
1047
1048         lod_getref(&lod->lod_ost_descs);
1049         if (lod->lod_osts_size > 0) {
1050                 cfs_foreach_bit(lod->lod_ost_bitmap, i) {
1051                         struct lod_tgt_desc *tgt;
1052                         tgt = OST_TGT(lod, i);
1053                         LASSERT(tgt && tgt->ltd_tgt);
1054                         next = &tgt->ltd_ost->dd_lu_dev;
1055                         rc = next->ld_ops->ldo_recovery_complete(env, next);
1056                         if (rc)
1057                                 CERROR("%s: can't complete recovery on #%d:"
1058                                         "%d\n", lod2obd(lod)->obd_name, i, rc);
1059                 }
1060         }
1061         lod_putref(lod, &lod->lod_ost_descs);
1062         RETURN(rc);
1063 }
1064
1065 /**
1066  * Init update logs on all sub device
1067  *
1068  * LOD initialize update logs on all of sub devices. Because the initialization
1069  * process might need FLD lookup, see llog_osd_open()->dt_locate()->...->
1070  * lod_object_init(), this API has to be called after LOD is initialized.
1071  * \param[in] env       execution environment
1072  * \param[in] lod       lod device
1073  *
1074  * \retval              0 if update log is initialized successfully.
1075  * \retval              negative errno if initialization fails.
1076  */
1077 static int lod_sub_init_llogs(const struct lu_env *env, struct lod_device *lod)
1078 {
1079         struct lod_tgt_descs    *ltd = &lod->lod_mdt_descs;
1080         int                     rc;
1081         unsigned int            i;
1082         ENTRY;
1083
1084         /* llog must be setup after LOD is initialized, because llog
1085          * initialization include FLD lookup */
1086         LASSERT(lod->lod_initialized);
1087
1088         /* Init the llog in its own stack */
1089         rc = lod_sub_init_llog(env, lod, lod->lod_child);
1090         if (rc < 0)
1091                 RETURN(rc);
1092
1093         cfs_foreach_bit(ltd->ltd_tgt_bitmap, i) {
1094                 struct lod_tgt_desc     *tgt;
1095
1096                 tgt = LTD_TGT(ltd, i);
1097                 rc = lod_sub_init_llog(env, lod, tgt->ltd_tgt);
1098                 if (rc != 0)
1099                         break;
1100         }
1101
1102         RETURN(rc);
1103 }
1104
1105 /**
1106  * Implementation of lu_device_operations::ldo_prepare() for LOD
1107  *
1108  * see include/lu_object.h for the details.
1109  */
1110 static int lod_prepare(const struct lu_env *env, struct lu_device *pdev,
1111                        struct lu_device *cdev)
1112 {
1113         struct lod_device       *lod = lu2lod_dev(cdev);
1114         struct lu_device        *next = &lod->lod_child->dd_lu_dev;
1115         struct lu_fid           *fid = &lod_env_info(env)->lti_fid;
1116         int                     rc;
1117         struct dt_object        *root;
1118         struct dt_object        *dto;
1119         __u32                   index;
1120         ENTRY;
1121
1122         rc = next->ld_ops->ldo_prepare(env, pdev, next);
1123         if (rc != 0) {
1124                 CERROR("%s: prepare bottom error: rc = %d\n",
1125                        lod2obd(lod)->obd_name, rc);
1126                 RETURN(rc);
1127         }
1128
1129         lod->lod_initialized = 1;
1130
1131         rc = dt_root_get(env, lod->lod_child, fid);
1132         if (rc < 0)
1133                 RETURN(rc);
1134
1135         root = dt_locate(env, lod->lod_child, fid);
1136         if (IS_ERR(root))
1137                 RETURN(PTR_ERR(root));
1138
1139         /* Create update log object */
1140         index = lu_site2seq(lod2lu_dev(lod)->ld_site)->ss_node_id;
1141         lu_update_log_fid(fid, index);
1142
1143         dto = local_file_find_or_create_with_fid(env, lod->lod_child,
1144                                                  fid, root,
1145                                                  lod_update_log_name,
1146                                                  S_IFREG | S_IRUGO | S_IWUSR);
1147         if (IS_ERR(dto))
1148                 GOTO(out_put, rc = PTR_ERR(dto));
1149
1150         lu_object_put(env, &dto->do_lu);
1151
1152         /* Create update log dir */
1153         lu_update_log_dir_fid(fid, index);
1154         dto = local_file_find_or_create_with_fid(env, lod->lod_child,
1155                                                  fid, root,
1156                                                  lod_update_log_dir_name,
1157                                                  S_IFDIR | S_IRUGO | S_IWUSR);
1158         if (IS_ERR(dto))
1159                 GOTO(out_put, rc = PTR_ERR(dto));
1160
1161         lu_object_put(env, &dto->do_lu);
1162
1163         rc = lod_prepare_distribute_txn(env, lod);
1164         if (rc != 0)
1165                 GOTO(out_put, rc);
1166
1167         rc = lod_sub_init_llogs(env, lod);
1168         if (rc != 0)
1169                 GOTO(out_put, rc);
1170
1171 out_put:
1172         lu_object_put(env, &root->do_lu);
1173
1174         RETURN(rc);
1175 }
1176
1177 const struct lu_device_operations lod_lu_ops = {
1178         .ldo_object_alloc       = lod_object_alloc,
1179         .ldo_process_config     = lod_process_config,
1180         .ldo_recovery_complete  = lod_recovery_complete,
1181         .ldo_prepare            = lod_prepare,
1182 };
1183
1184 /**
1185  * Implementation of dt_device_operations::dt_root_get() for LOD
1186  *
1187  * see include/dt_object.h for the details.
1188  */
1189 static int lod_root_get(const struct lu_env *env,
1190                         struct dt_device *dev, struct lu_fid *f)
1191 {
1192         return dt_root_get(env, dt2lod_dev(dev)->lod_child, f);
1193 }
1194
1195 /**
1196  * Implementation of dt_device_operations::dt_statfs() for LOD
1197  *
1198  * see include/dt_object.h for the details.
1199  */
1200 static int lod_statfs(const struct lu_env *env,
1201                       struct dt_device *dev, struct obd_statfs *sfs)
1202 {
1203         return dt_statfs(env, dt2lod_dev(dev)->lod_child, sfs);
1204 }
1205
1206 /**
1207  * Implementation of dt_device_operations::dt_trans_create() for LOD
1208  *
1209  * Creates a transaction using local (to this node) OSD.
1210  *
1211  * see include/dt_object.h for the details.
1212  */
1213 static struct thandle *lod_trans_create(const struct lu_env *env,
1214                                         struct dt_device *dt)
1215 {
1216         struct thandle *th;
1217
1218         th = top_trans_create(env, dt2lod_dev(dt)->lod_child);
1219         if (IS_ERR(th))
1220                 return th;
1221
1222         th->th_dev = dt;
1223
1224         return th;
1225 }
1226
1227 /**
1228  * Implementation of dt_device_operations::dt_trans_start() for LOD
1229  *
1230  * Starts the set of local transactions using the targets involved
1231  * in declare phase. Initial support for the distributed transactions.
1232  *
1233  * see include/dt_object.h for the details.
1234  */
1235 static int lod_trans_start(const struct lu_env *env, struct dt_device *dt,
1236                            struct thandle *th)
1237 {
1238         return top_trans_start(env, dt2lod_dev(dt)->lod_child, th);
1239 }
1240
1241 static int lod_trans_cb_add(struct thandle *th,
1242                             struct dt_txn_commit_cb *dcb)
1243 {
1244         struct top_thandle      *top_th = container_of(th, struct top_thandle,
1245                                                        tt_super);
1246         return dt_trans_cb_add(top_th->tt_master_sub_thandle, dcb);
1247 }
1248
1249 /**
1250  * add noop update to the update records
1251  *
1252  * Add noop updates to the update records, which is only used in
1253  * test right now.
1254  *
1255  * \param[in] env       execution environment
1256  * \param[in] dt        dt device of lod
1257  * \param[in] th        thandle
1258  * \param[in] count     the count of update records to be added.
1259  *
1260  * \retval              0 if adding succeeds.
1261  * \retval              negative errno if adding fails.
1262  */
1263 static int lod_add_noop_records(const struct lu_env *env,
1264                                 struct dt_device *dt, struct thandle *th,
1265                                 int count)
1266 {
1267         struct top_thandle *top_th;
1268         struct lu_fid *fid = &lod_env_info(env)->lti_fid;
1269         int i;
1270         int rc = 0;
1271
1272         top_th = container_of(th, struct top_thandle, tt_super);
1273         if (top_th->tt_multiple_thandle == NULL)
1274                 return 0;
1275
1276         fid_zero(fid);
1277         for (i = 0; i < count; i++) {
1278                 rc = update_record_pack(noop, th, fid);
1279                 if (rc < 0)
1280                         return rc;
1281         }
1282         return rc;
1283 }
1284
1285 /**
1286  * Implementation of dt_device_operations::dt_trans_stop() for LOD
1287  *
1288  * Stops the set of local transactions using the targets involved
1289  * in declare phase. Initial support for the distributed transactions.
1290  *
1291  * see include/dt_object.h for the details.
1292  */
1293 static int lod_trans_stop(const struct lu_env *env, struct dt_device *dt,
1294                           struct thandle *th)
1295 {
1296         if (OBD_FAIL_CHECK(OBD_FAIL_SPLIT_UPDATE_REC)) {
1297                 int rc;
1298
1299                 rc = lod_add_noop_records(env, dt, th, 5000);
1300                 if (rc < 0)
1301                         RETURN(rc);
1302         }
1303         return top_trans_stop(env, dt2lod_dev(dt)->lod_child, th);
1304 }
1305
1306 /**
1307  * Implementation of dt_device_operations::dt_conf_get() for LOD
1308  *
1309  * Currently returns the configuration provided by the local OSD.
1310  *
1311  * see include/dt_object.h for the details.
1312  */
1313 static void lod_conf_get(const struct lu_env *env,
1314                          const struct dt_device *dev,
1315                          struct dt_device_param *param)
1316 {
1317         dt_conf_get(env, dt2lod_dev((struct dt_device *)dev)->lod_child, param);
1318 }
1319
1320 /**
1321  * Implementation of dt_device_operations::dt_sync() for LOD
1322  *
1323  * Syncs all known OST targets. Very very expensive and used
1324  * rarely by LFSCK now. Should not be used in general.
1325  *
1326  * see include/dt_object.h for the details.
1327  */
1328 static int lod_sync(const struct lu_env *env, struct dt_device *dev)
1329 {
1330         struct lod_device   *lod = dt2lod_dev(dev);
1331         struct lod_ost_desc *ost;
1332         unsigned int         i;
1333         int                  rc = 0;
1334         ENTRY;
1335
1336         lod_getref(&lod->lod_ost_descs);
1337         lod_foreach_ost(lod, i) {
1338                 ost = OST_TGT(lod, i);
1339                 LASSERT(ost && ost->ltd_ost);
1340                 rc = dt_sync(env, ost->ltd_ost);
1341                 if (rc) {
1342                         CERROR("%s: can't sync %u: %d\n",
1343                                lod2obd(lod)->obd_name, i, rc);
1344                         break;
1345                 }
1346         }
1347         lod_putref(lod, &lod->lod_ost_descs);
1348         if (rc == 0)
1349                 rc = dt_sync(env, lod->lod_child);
1350
1351         RETURN(rc);
1352 }
1353
1354 /**
1355  * Implementation of dt_device_operations::dt_ro() for LOD
1356  *
1357  * Turns local OSD read-only, used for the testing only.
1358  *
1359  * see include/dt_object.h for the details.
1360  */
1361 static int lod_ro(const struct lu_env *env, struct dt_device *dev)
1362 {
1363         return dt_ro(env, dt2lod_dev(dev)->lod_child);
1364 }
1365
1366 /**
1367  * Implementation of dt_device_operations::dt_commit_async() for LOD
1368  *
1369  * Asks local OSD to commit sooner.
1370  *
1371  * see include/dt_object.h for the details.
1372  */
1373 static int lod_commit_async(const struct lu_env *env, struct dt_device *dev)
1374 {
1375         return dt_commit_async(env, dt2lod_dev(dev)->lod_child);
1376 }
1377
1378 static const struct dt_device_operations lod_dt_ops = {
1379         .dt_root_get         = lod_root_get,
1380         .dt_statfs           = lod_statfs,
1381         .dt_trans_create     = lod_trans_create,
1382         .dt_trans_start      = lod_trans_start,
1383         .dt_trans_stop       = lod_trans_stop,
1384         .dt_conf_get         = lod_conf_get,
1385         .dt_sync             = lod_sync,
1386         .dt_ro               = lod_ro,
1387         .dt_commit_async     = lod_commit_async,
1388         .dt_trans_cb_add     = lod_trans_cb_add,
1389 };
1390
1391 /**
1392  * Connect to a local OSD.
1393  *
1394  * Used to connect to the local OSD at mount. OSD name is taken from the
1395  * configuration command passed. This connection is used to identify LU
1396  * site and pin the OSD from early removal.
1397  *
1398  * \param[in] env               LU environment provided by the caller
1399  * \param[in] lod               lod device
1400  * \param[in] cfg               configuration command to apply
1401  *
1402  * \retval 0                    on success
1403  * \retval negative             negated errno on error
1404  **/
1405 static int lod_connect_to_osd(const struct lu_env *env, struct lod_device *lod,
1406                               struct lustre_cfg *cfg)
1407 {
1408         struct obd_connect_data *data = NULL;
1409         struct obd_device       *obd;
1410         char                    *nextdev = NULL, *p, *s;
1411         int                      rc, len = 0;
1412         ENTRY;
1413
1414         LASSERT(cfg);
1415         LASSERT(lod->lod_child_exp == NULL);
1416
1417         /* compatibility hack: we still use old config logs
1418          * which specify LOV, but we need to learn underlying
1419          * OSD device, which is supposed to be:
1420          *  <fsname>-MDTxxxx-osd
1421          *
1422          * 2.x MGS generates lines like the following:
1423          *   #03 (176)lov_setup 0:lustre-MDT0000-mdtlov  1:(struct lov_desc)
1424          * 1.8 MGS generates lines like the following:
1425          *   #03 (168)lov_setup 0:lustre-mdtlov  1:(struct lov_desc)
1426          *
1427          * we use "-MDT" to differentiate 2.x from 1.8 */
1428
1429         if ((p = lustre_cfg_string(cfg, 0)) && strstr(p, "-mdtlov")) {
1430                 len = strlen(p) + 6;
1431                 OBD_ALLOC(nextdev, len);
1432                 if (nextdev == NULL)
1433                         GOTO(out, rc = -ENOMEM);
1434
1435                 strcpy(nextdev, p);
1436                 s = strstr(nextdev, "-mdtlov");
1437                 if (unlikely(s == NULL)) {
1438                         CERROR("unable to parse device name %s\n",
1439                                lustre_cfg_string(cfg, 0));
1440                         GOTO(out, rc = -EINVAL);
1441                 }
1442
1443                 if (strstr(nextdev, "-MDT")) {
1444                         /* 2.x config */
1445                         strcpy(s, "-osd");
1446                 } else {
1447                         /* 1.8 config */
1448                         strcpy(s, "-MDT0000-osd");
1449                 }
1450         } else {
1451                 CERROR("unable to parse device name %s\n",
1452                        lustre_cfg_string(cfg, 0));
1453                 GOTO(out, rc = -EINVAL);
1454         }
1455
1456         OBD_ALLOC_PTR(data);
1457         if (data == NULL)
1458                 GOTO(out, rc = -ENOMEM);
1459
1460         obd = class_name2obd(nextdev);
1461         if (obd == NULL) {
1462                 CERROR("can not locate next device: %s\n", nextdev);
1463                 GOTO(out, rc = -ENOTCONN);
1464         }
1465
1466         data->ocd_connect_flags = OBD_CONNECT_VERSION;
1467         data->ocd_version = LUSTRE_VERSION_CODE;
1468
1469         rc = obd_connect(env, &lod->lod_child_exp, obd, &obd->obd_uuid,
1470                          data, NULL);
1471         if (rc) {
1472                 CERROR("cannot connect to next dev %s (%d)\n", nextdev, rc);
1473                 GOTO(out, rc);
1474         }
1475
1476         lod->lod_dt_dev.dd_lu_dev.ld_site =
1477                 lod->lod_child_exp->exp_obd->obd_lu_dev->ld_site;
1478         LASSERT(lod->lod_dt_dev.dd_lu_dev.ld_site);
1479         lod->lod_child = lu2dt_dev(lod->lod_child_exp->exp_obd->obd_lu_dev);
1480
1481 out:
1482         if (data)
1483                 OBD_FREE_PTR(data);
1484         if (nextdev)
1485                 OBD_FREE(nextdev, len);
1486         RETURN(rc);
1487 }
1488
1489 /**
1490  * Allocate and initialize target table.
1491  *
1492  * A helper function to initialize the target table and allocate
1493  * a bitmap of the available targets.
1494  *
1495  * \param[in] ltd               target's table to initialize
1496  *
1497  * \retval 0                    on success
1498  * \retval negative             negated errno on error
1499  **/
1500 static int lod_tgt_desc_init(struct lod_tgt_descs *ltd)
1501 {
1502         mutex_init(&ltd->ltd_mutex);
1503         init_rwsem(&ltd->ltd_rw_sem);
1504
1505         /* the OST array and bitmap are allocated/grown dynamically as OSTs are
1506          * added to the LOD, see lod_add_device() */
1507         ltd->ltd_tgt_bitmap = CFS_ALLOCATE_BITMAP(32);
1508         if (ltd->ltd_tgt_bitmap == NULL)
1509                 RETURN(-ENOMEM);
1510
1511         ltd->ltd_tgts_size  = 32;
1512         ltd->ltd_tgtnr      = 0;
1513
1514         ltd->ltd_death_row = 0;
1515         ltd->ltd_refcount  = 0;
1516         return 0;
1517 }
1518
1519 /**
1520  * Initialize LOD device at setup.
1521  *
1522  * Initializes the given LOD device using the original configuration command.
1523  * The function initiates a connection to the local OSD and initializes few
1524  * internal structures like pools, target tables, etc.
1525  *
1526  * \param[in] env               LU environment provided by the caller
1527  * \param[in] lod               lod device
1528  * \param[in] ldt               not used
1529  * \param[in] cfg               configuration command
1530  *
1531  * \retval 0                    on success
1532  * \retval negative             negated errno on error
1533  **/
1534 static int lod_init0(const struct lu_env *env, struct lod_device *lod,
1535                      struct lu_device_type *ldt, struct lustre_cfg *cfg)
1536 {
1537         struct dt_device_param ddp;
1538         struct obd_device     *obd;
1539         int                    rc;
1540         ENTRY;
1541
1542         obd = class_name2obd(lustre_cfg_string(cfg, 0));
1543         if (obd == NULL) {
1544                 CERROR("Cannot find obd with name %s\n",
1545                        lustre_cfg_string(cfg, 0));
1546                 RETURN(-ENODEV);
1547         }
1548
1549         obd->obd_lu_dev = &lod->lod_dt_dev.dd_lu_dev;
1550         lod->lod_dt_dev.dd_lu_dev.ld_obd = obd;
1551         lod->lod_dt_dev.dd_lu_dev.ld_ops = &lod_lu_ops;
1552         lod->lod_dt_dev.dd_ops = &lod_dt_ops;
1553
1554         rc = lod_connect_to_osd(env, lod, cfg);
1555         if (rc)
1556                 RETURN(rc);
1557
1558         dt_conf_get(env, &lod->lod_dt_dev, &ddp);
1559         lod->lod_osd_max_easize = ddp.ddp_max_ea_size;
1560
1561         /* setup obd to be used with old lov code */
1562         rc = lod_pools_init(lod, cfg);
1563         if (rc)
1564                 GOTO(out_disconnect, rc);
1565
1566         rc = lod_procfs_init(lod);
1567         if (rc)
1568                 GOTO(out_pools, rc);
1569
1570         spin_lock_init(&lod->lod_lock);
1571         spin_lock_init(&lod->lod_connects_lock);
1572         lod_tgt_desc_init(&lod->lod_mdt_descs);
1573         lod_tgt_desc_init(&lod->lod_ost_descs);
1574
1575         RETURN(0);
1576
1577 out_pools:
1578         lod_pools_fini(lod);
1579 out_disconnect:
1580         obd_disconnect(lod->lod_child_exp);
1581         RETURN(rc);
1582 }
1583
1584 /**
1585  * Implementation of lu_device_type_operations::ldto_device_free() for LOD
1586  *
1587  * Releases the memory allocated for LOD device.
1588  *
1589  * see include/lu_object.h for the details.
1590  */
1591 static struct lu_device *lod_device_free(const struct lu_env *env,
1592                                          struct lu_device *lu)
1593 {
1594         struct lod_device *lod = lu2lod_dev(lu);
1595         struct lu_device  *next = &lod->lod_child->dd_lu_dev;
1596         ENTRY;
1597
1598         LASSERTF(atomic_read(&lu->ld_ref) == 0, "lu is %p\n", lu);
1599         dt_device_fini(&lod->lod_dt_dev);
1600         OBD_FREE_PTR(lod);
1601         RETURN(next);
1602 }
1603
1604 /**
1605  * Implementation of lu_device_type_operations::ldto_device_alloc() for LOD
1606  *
1607  * Allocates LOD device and calls the helpers to initialize it.
1608  *
1609  * see include/lu_object.h for the details.
1610  */
1611 static struct lu_device *lod_device_alloc(const struct lu_env *env,
1612                                           struct lu_device_type *type,
1613                                           struct lustre_cfg *lcfg)
1614 {
1615         struct lod_device *lod;
1616         struct lu_device  *lu_dev;
1617
1618         OBD_ALLOC_PTR(lod);
1619         if (lod == NULL) {
1620                 lu_dev = ERR_PTR(-ENOMEM);
1621         } else {
1622                 int rc;
1623
1624                 lu_dev = lod2lu_dev(lod);
1625                 dt_device_init(&lod->lod_dt_dev, type);
1626                 rc = lod_init0(env, lod, type, lcfg);
1627                 if (rc != 0) {
1628                         lod_device_free(env, lu_dev);
1629                         lu_dev = ERR_PTR(rc);
1630                 }
1631         }
1632
1633         return lu_dev;
1634 }
1635
1636 /**
1637  * Implementation of lu_device_type_operations::ldto_device_fini() for LOD
1638  *
1639  * Releases the internal resources used by LOD device.
1640  *
1641  * see include/lu_object.h for the details.
1642  */
1643 static struct lu_device *lod_device_fini(const struct lu_env *env,
1644                                          struct lu_device *d)
1645 {
1646         struct lod_device *lod = lu2lod_dev(d);
1647         int                rc;
1648         ENTRY;
1649
1650         lod_pools_fini(lod);
1651
1652         lod_procfs_fini(lod);
1653
1654         rc = lod_fini_tgt(env, lod, &lod->lod_ost_descs, true);
1655         if (rc)
1656                 CERROR("%s:can not fini ost descs %d\n",
1657                         lod2obd(lod)->obd_name, rc);
1658
1659         rc = lod_fini_tgt(env, lod, &lod->lod_mdt_descs, false);
1660         if (rc)
1661                 CERROR("%s:can not fini mdt descs %d\n",
1662                         lod2obd(lod)->obd_name, rc);
1663
1664         RETURN(NULL);
1665 }
1666
1667 /**
1668  * Implementation of obd_ops::o_connect() for LOD
1669  *
1670  * Used to track all the users of this specific LOD device,
1671  * so the device stays up until the last user disconnected.
1672  *
1673  * \param[in] env               LU environment provided by the caller
1674  * \param[out] exp              export the caller will be using to access LOD
1675  * \param[in] obd               OBD device representing LOD device
1676  * \param[in] cluuid            unique identifier of the caller
1677  * \param[in] data              not used
1678  * \param[in] localdata         not used
1679  *
1680  * \retval 0                    on success
1681  * \retval negative             negated errno on error
1682  **/
1683 static int lod_obd_connect(const struct lu_env *env, struct obd_export **exp,
1684                            struct obd_device *obd, struct obd_uuid *cluuid,
1685                            struct obd_connect_data *data, void *localdata)
1686 {
1687         struct lod_device    *lod = lu2lod_dev(obd->obd_lu_dev);
1688         struct lustre_handle  conn;
1689         int                   rc;
1690         ENTRY;
1691
1692         CDEBUG(D_CONFIG, "connect #%d\n", lod->lod_connects);
1693
1694         rc = class_connect(&conn, obd, cluuid);
1695         if (rc)
1696                 RETURN(rc);
1697
1698         *exp = class_conn2export(&conn);
1699
1700         spin_lock(&lod->lod_connects_lock);
1701         lod->lod_connects++;
1702         /* at the moment we expect the only user */
1703         LASSERT(lod->lod_connects == 1);
1704         spin_unlock(&lod->lod_connects_lock);
1705
1706         RETURN(0);
1707 }
1708
1709 /**
1710  *
1711  * Implementation of obd_ops::o_disconnect() for LOD
1712  *
1713  * When the caller doesn't need to use this LOD instance, it calls
1714  * obd_disconnect() and LOD releases corresponding export/reference count.
1715  * Once all the users gone, LOD device is released.
1716  *
1717  * \param[in] exp               export provided to the caller in obd_connect()
1718  *
1719  * \retval 0                    on success
1720  * \retval negative             negated errno on error
1721  **/
1722 static int lod_obd_disconnect(struct obd_export *exp)
1723 {
1724         struct obd_device *obd = exp->exp_obd;
1725         struct lod_device *lod = lu2lod_dev(obd->obd_lu_dev);
1726         int                rc, release = 0;
1727         ENTRY;
1728
1729         /* Only disconnect the underlying layers on the final disconnect. */
1730         spin_lock(&lod->lod_connects_lock);
1731         lod->lod_connects--;
1732         if (lod->lod_connects != 0) {
1733                 /* why should there be more than 1 connect? */
1734                 spin_unlock(&lod->lod_connects_lock);
1735                 CERROR("%s: disconnect #%d\n", exp->exp_obd->obd_name,
1736                        lod->lod_connects);
1737                 goto out;
1738         }
1739         spin_unlock(&lod->lod_connects_lock);
1740
1741         /* the last user of lod has gone, let's release the device */
1742         release = 1;
1743
1744 out:
1745         rc = class_disconnect(exp); /* bz 9811 */
1746
1747         if (rc == 0 && release)
1748                 class_manual_cleanup(obd);
1749         RETURN(rc);
1750 }
1751
1752 LU_KEY_INIT(lod, struct lod_thread_info);
1753
1754 static void lod_key_fini(const struct lu_context *ctx,
1755                 struct lu_context_key *key, void *data)
1756 {
1757         struct lod_thread_info *info = data;
1758         /* allocated in lod_get_lov_ea
1759          * XXX: this is overload, a tread may have such store but used only
1760          * once. Probably better would be pool of such stores per LOD.
1761          */
1762         if (info->lti_ea_store) {
1763                 OBD_FREE_LARGE(info->lti_ea_store, info->lti_ea_store_size);
1764                 info->lti_ea_store = NULL;
1765                 info->lti_ea_store_size = 0;
1766         }
1767         lu_buf_free(&info->lti_linkea_buf);
1768         OBD_FREE_PTR(info);
1769 }
1770
1771 /* context key: lod_thread_key */
1772 LU_CONTEXT_KEY_DEFINE(lod, LCT_MD_THREAD);
1773
1774 LU_TYPE_INIT_FINI(lod, &lod_thread_key);
1775
1776 static struct lu_device_type_operations lod_device_type_ops = {
1777         .ldto_init           = lod_type_init,
1778         .ldto_fini           = lod_type_fini,
1779
1780         .ldto_start          = lod_type_start,
1781         .ldto_stop           = lod_type_stop,
1782
1783         .ldto_device_alloc   = lod_device_alloc,
1784         .ldto_device_free    = lod_device_free,
1785
1786         .ldto_device_fini    = lod_device_fini
1787 };
1788
1789 static struct lu_device_type lod_device_type = {
1790         .ldt_tags     = LU_DEVICE_DT,
1791         .ldt_name     = LUSTRE_LOD_NAME,
1792         .ldt_ops      = &lod_device_type_ops,
1793         .ldt_ctx_tags = LCT_MD_THREAD,
1794 };
1795
1796 /**
1797  * Implementation of obd_ops::o_get_info() for LOD
1798  *
1799  * Currently, there is only one supported key: KEY_OSP_CONNECTED , to provide
1800  * the caller binary status whether LOD has seen connection to any OST target.
1801  * It will also check if the MDT update log context being initialized (if
1802  * needed).
1803  *
1804  * \param[in] env               LU environment provided by the caller
1805  * \param[in] exp               export of the caller
1806  * \param[in] keylen            len of the key
1807  * \param[in] key               the key
1808  * \param[in] vallen            not used
1809  * \param[in] val               not used
1810  *
1811  * \retval                      0 if a connection was seen
1812  * \retval                      -EAGAIN if LOD isn't running yet or no
1813  *                              connection has been seen yet
1814  * \retval                      -EINVAL if not supported key is requested
1815  **/
1816 static int lod_obd_get_info(const struct lu_env *env, struct obd_export *exp,
1817                             __u32 keylen, void *key, __u32 *vallen, void *val)
1818 {
1819         int rc = -EINVAL;
1820
1821         if (KEY_IS(KEY_OSP_CONNECTED)) {
1822                 struct obd_device       *obd = exp->exp_obd;
1823                 struct lod_device       *d;
1824                 struct lod_tgt_desc     *tgt;
1825                 unsigned int            i;
1826                 int                     rc = 1;
1827
1828                 if (!obd->obd_set_up || obd->obd_stopping)
1829                         RETURN(-EAGAIN);
1830
1831                 d = lu2lod_dev(obd->obd_lu_dev);
1832                 lod_getref(&d->lod_ost_descs);
1833                 lod_foreach_ost(d, i) {
1834                         tgt = OST_TGT(d, i);
1835                         LASSERT(tgt && tgt->ltd_tgt);
1836                         rc = obd_get_info(env, tgt->ltd_exp, keylen, key,
1837                                           vallen, val);
1838                         /* one healthy device is enough */
1839                         if (rc == 0)
1840                                 break;
1841                 }
1842                 lod_putref(d, &d->lod_ost_descs);
1843
1844                 lod_getref(&d->lod_mdt_descs);
1845                 lod_foreach_mdt(d, i) {
1846                         struct llog_ctxt *ctxt;
1847
1848                         tgt = MDT_TGT(d, i);
1849                         LASSERT(tgt != NULL);
1850                         LASSERT(tgt->ltd_tgt != NULL);
1851                         if (!tgt->ltd_active)
1852                                 continue;
1853
1854                         ctxt = llog_get_context(tgt->ltd_tgt->dd_lu_dev.ld_obd,
1855                                                 LLOG_UPDATELOG_ORIG_CTXT);
1856                         if (ctxt == NULL) {
1857                                 CDEBUG(D_INFO, "%s: %s is not ready.\n",
1858                                        obd->obd_name,
1859                                       tgt->ltd_tgt->dd_lu_dev.ld_obd->obd_name);
1860                                 rc = -EAGAIN;
1861                                 break;
1862                         }
1863                         if (ctxt->loc_handle == NULL) {
1864                                 CDEBUG(D_INFO, "%s: %s is not ready.\n",
1865                                        obd->obd_name,
1866                                       tgt->ltd_tgt->dd_lu_dev.ld_obd->obd_name);
1867                                 rc = -EAGAIN;
1868                                 llog_ctxt_put(ctxt);
1869                                 break;
1870                         }
1871                         llog_ctxt_put(ctxt);
1872                 }
1873                 lod_putref(d, &d->lod_mdt_descs);
1874
1875                 RETURN(rc);
1876         }
1877
1878         RETURN(rc);
1879 }
1880
1881 static int lod_obd_set_info_async(const struct lu_env *env,
1882                                   struct obd_export *exp,
1883                                   __u32 keylen, void *key,
1884                                   __u32 vallen, void *val,
1885                                   struct ptlrpc_request_set *set)
1886 {
1887         struct obd_device *obd = class_exp2obd(exp);
1888         struct lod_device *d;
1889         struct lod_tgt_desc *tgt;
1890         int no_set = 0;
1891         int i, rc = 0, rc2;
1892         ENTRY;
1893
1894         if (set == NULL) {
1895                 no_set = 1;
1896                 set = ptlrpc_prep_set();
1897                 if (!set)
1898                         RETURN(-ENOMEM);
1899         }
1900
1901         d = lu2lod_dev(obd->obd_lu_dev);
1902         lod_getref(&d->lod_ost_descs);
1903         lod_foreach_ost(d, i) {
1904                 tgt = OST_TGT(d, i);
1905                 LASSERT(tgt && tgt->ltd_tgt);
1906                 if (!tgt->ltd_active)
1907                         continue;
1908
1909                 rc2 = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
1910                                          vallen, val, set);
1911                 if (rc2 != 0 && rc == 0)
1912                         rc = rc2;
1913         }
1914         lod_putref(d, &d->lod_ost_descs);
1915
1916         lod_getref(&d->lod_mdt_descs);
1917         lod_foreach_mdt(d, i) {
1918                 tgt = MDT_TGT(d, i);
1919                 LASSERT(tgt && tgt->ltd_tgt);
1920                 if (!tgt->ltd_active)
1921                         continue;
1922                 rc2 = obd_set_info_async(env, tgt->ltd_exp, keylen, key,
1923                                          vallen, val, set);
1924                 if (rc2 != 0 && rc == 0)
1925                         rc = rc2;
1926         }
1927         lod_putref(d, &d->lod_mdt_descs);
1928
1929
1930         if (no_set) {
1931                 rc2 = ptlrpc_set_wait(set);
1932                 if (rc2 == 0 && rc == 0)
1933                         rc = rc2;
1934                 ptlrpc_set_destroy(set);
1935         }
1936         RETURN(rc);
1937 }
1938
1939 static struct obd_ops lod_obd_device_ops = {
1940         .o_owner        = THIS_MODULE,
1941         .o_connect      = lod_obd_connect,
1942         .o_disconnect   = lod_obd_disconnect,
1943         .o_get_info     = lod_obd_get_info,
1944         .o_set_info_async = lod_obd_set_info_async,
1945         .o_pool_new     = lod_pool_new,
1946         .o_pool_rem     = lod_pool_remove,
1947         .o_pool_add     = lod_pool_add,
1948         .o_pool_del     = lod_pool_del,
1949 };
1950
1951 static int __init lod_init(void)
1952 {
1953         struct obd_type *type;
1954         int rc;
1955
1956         rc = lu_kmem_init(lod_caches);
1957         if (rc)
1958                 return rc;
1959
1960         rc = class_register_type(&lod_obd_device_ops, NULL, true, NULL,
1961                                  LUSTRE_LOD_NAME, &lod_device_type);
1962         if (rc) {
1963                 lu_kmem_fini(lod_caches);
1964                 return rc;
1965         }
1966
1967         /* create "lov" entry in procfs for compatibility purposes */
1968         type = class_search_type(LUSTRE_LOV_NAME);
1969         if (type != NULL && type->typ_procroot != NULL)
1970                 return rc;
1971
1972         type = class_search_type(LUSTRE_LOD_NAME);
1973         type->typ_procsym = lprocfs_register("lov", proc_lustre_root,
1974                                              NULL, NULL);
1975         if (IS_ERR(type->typ_procsym)) {
1976                 CERROR("lod: can't create compat entry \"lov\": %d\n",
1977                        (int)PTR_ERR(type->typ_procsym));
1978                 type->typ_procsym = NULL;
1979         }
1980         return rc;
1981 }
1982
1983 static void __exit lod_exit(void)
1984 {
1985         class_unregister_type(LUSTRE_LOD_NAME);
1986         lu_kmem_fini(lod_caches);
1987 }
1988
1989 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
1990 MODULE_DESCRIPTION("Lustre Logical Object Device ("LUSTRE_LOD_NAME")");
1991 MODULE_VERSION(LUSTRE_VERSION_STRING);
1992 MODULE_LICENSE("GPL");
1993
1994 module_init(lod_init);
1995 module_exit(lod_exit);