Pileus Git - ~andy/linux/blob - drivers/staging/lustre/lustre/mgc/mgc_request.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, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/mgc/mgc_request.c
  37  *
  38  * Author: Nathan Rutman <nathan@clusterfs.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_MGC
  42 #define D_MGC D_CONFIG /*|D_WARNING*/
  43
  44 #include <linux/module.h>
  45 #include <obd_class.h>
  46 #include <lustre_dlm.h>
  47 #include <lprocfs_status.h>
  48 #include <lustre_log.h>
  49 #include <lustre_disk.h>
  50 #include <dt_object.h>
  51
  52 #include "mgc_internal.h"
  53
  54 static int mgc_name2resid(char *name, int len, struct ldlm_res_id *res_id,
  55                           int type)
  56 {
  57         __u64 resname = 0;
  58
  59         if (len > 8) {
  60                 CERROR("name too long: %s\n", name);
  61                 return -EINVAL;
  62         }
  63         if (len <= 0) {
  64                 CERROR("missing name: %s\n", name);
  65                 return -EINVAL;
  66         }
  67         memcpy(&resname, name, len);
  68
  69         /* Always use the same endianness for the resid */
  70         memset(res_id, 0, sizeof(*res_id));
  71         res_id->name[0] = cpu_to_le64(resname);
  72         /* XXX: unfortunately, sptlprc and config llog share one lock */
  73         switch (type) {
  74         case CONFIG_T_CONFIG:
  75         case CONFIG_T_SPTLRPC:
  76                 resname = 0;
  77                 break;
  78         case CONFIG_T_RECOVER:
  79                 resname = type;
  80                 break;
  81         default:
  82                 LBUG();
  83         }
  84         res_id->name[1] = cpu_to_le64(resname);
  85         CDEBUG(D_MGC, "log %s to resid "LPX64"/"LPX64" (%.8s)\n", name,
  86                res_id->name[0], res_id->name[1], (char *)&res_id->name[0]);
  87         return 0;
  88 }
  89
  90 int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type)
  91 {
  92         /* fsname is at most 8 chars long, maybe contain "-".
  93          * e.g. "lustre", "SUN-000" */
  94         return mgc_name2resid(fsname, strlen(fsname), res_id, type);
  95 }
  96 EXPORT_SYMBOL(mgc_fsname2resid);
  97
  98 int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id, int type)
  99 {
 100         char *name_end;
 101         int len;
 102
 103         /* logname consists of "fsname-nodetype".
 104          * e.g. "lustre-MDT0001", "SUN-000-client" */
 105         name_end = strrchr(logname, '-');
 106         LASSERT(name_end);
 107         len = name_end - logname;
 108         return mgc_name2resid(logname, len, res_id, type);
 109 }
 110
 111 /********************** config llog list **********************/
 112 static LIST_HEAD(config_llog_list);
 113 static DEFINE_SPINLOCK(config_list_lock);
 114
 115 /* Take a reference to a config log */
 116 static int config_log_get(struct config_llog_data *cld)
 117 {
 118         atomic_inc(&cld->cld_refcount);
 119         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
 120                atomic_read(&cld->cld_refcount));
 121         return 0;
 122 }
 123
 124 /* Drop a reference to a config log.  When no longer referenced,
 125    we can free the config log data */
 126 static void config_log_put(struct config_llog_data *cld)
 127 {
 128         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
 129                atomic_read(&cld->cld_refcount));
 130         LASSERT(atomic_read(&cld->cld_refcount) > 0);
 131
 132         /* spinlock to make sure no item with 0 refcount in the list */
 133         if (atomic_dec_and_lock(&cld->cld_refcount, &config_list_lock)) {
 134                 list_del(&cld->cld_list_chain);
 135                 spin_unlock(&config_list_lock);
 136
 137                 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
 138
 139                 if (cld->cld_recover)
 140                         config_log_put(cld->cld_recover);
 141                 if (cld->cld_sptlrpc)
 142                         config_log_put(cld->cld_sptlrpc);
 143                 if (cld_is_sptlrpc(cld))
 144                         sptlrpc_conf_log_stop(cld->cld_logname);
 145
 146                 class_export_put(cld->cld_mgcexp);
 147                 OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1);
 148         }
 149 }
 150
 151 /* Find a config log by name */
 152 static
 153 struct config_llog_data *config_log_find(char *logname,
 154                                          struct config_llog_instance *cfg)
 155 {
 156         struct config_llog_data *cld;
 157         struct config_llog_data *found = NULL;
 158         void *             instance;
 159
 160         LASSERT(logname != NULL);
 161
 162         instance = cfg ? cfg->cfg_instance : NULL;
 163         spin_lock(&config_list_lock);
 164         list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 165                 /* check if instance equals */
 166                 if (instance != cld->cld_cfg.cfg_instance)
 167                         continue;
 168
 169                 /* instance may be NULL, should check name */
 170                 if (strcmp(logname, cld->cld_logname) == 0) {
 171                         found = cld;
 172                         break;
 173                 }
 174         }
 175         if (found) {
 176                 atomic_inc(&found->cld_refcount);
 177                 LASSERT(found->cld_stopping == 0 || cld_is_sptlrpc(found) == 0);
 178         }
 179         spin_unlock(&config_list_lock);
 180         return found;
 181 }
 182
 183 static
 184 struct config_llog_data *do_config_log_add(struct obd_device *obd,
 185                                            char *logname,
 186                                            int type,
 187                                            struct config_llog_instance *cfg,
 188                                            struct super_block *sb)
 189 {
 190         struct config_llog_data *cld;
 191         int                   rc;
 192
 193         CDEBUG(D_MGC, "do adding config log %s:%p\n", logname,
 194                cfg ? cfg->cfg_instance : 0);
 195
 196         OBD_ALLOC(cld, sizeof(*cld) + strlen(logname) + 1);
 197         if (!cld)
 198                 return ERR_PTR(-ENOMEM);
 199
 200         strcpy(cld->cld_logname, logname);
 201         if (cfg)
 202                 cld->cld_cfg = *cfg;
 203         else
 204                 cld->cld_cfg.cfg_callback = class_config_llog_handler;
 205         mutex_init(&cld->cld_lock);
 206         cld->cld_cfg.cfg_last_idx = 0;
 207         cld->cld_cfg.cfg_flags = 0;
 208         cld->cld_cfg.cfg_sb = sb;
 209         cld->cld_type = type;
 210         atomic_set(&cld->cld_refcount, 1);
 211
 212         /* Keep the mgc around until we are done */
 213         cld->cld_mgcexp = class_export_get(obd->obd_self_export);
 214
 215         if (cld_is_sptlrpc(cld)) {
 216                 sptlrpc_conf_log_start(logname);
 217                 cld->cld_cfg.cfg_obdname = obd->obd_name;
 218         }
 219
 220         rc = mgc_logname2resid(logname, &cld->cld_resid, type);
 221
 222         spin_lock(&config_list_lock);
 223         list_add(&cld->cld_list_chain, &config_llog_list);
 224         spin_unlock(&config_list_lock);
 225
 226         if (rc) {
 227                 config_log_put(cld);
 228                 return ERR_PTR(rc);
 229         }
 230
 231         if (cld_is_sptlrpc(cld)) {
 232                 rc = mgc_process_log(obd, cld);
 233                 if (rc && rc != -ENOENT)
 234                         CERROR("failed processing sptlrpc log: %d\n", rc);
 235         }
 236
 237         return cld;
 238 }
 239
 240 static struct config_llog_data *config_recover_log_add(struct obd_device *obd,
 241         char *fsname,
 242         struct config_llog_instance *cfg,
 243         struct super_block *sb)
 244 {
 245         struct config_llog_instance lcfg = *cfg;
 246         struct lustre_sb_info *lsi = s2lsi(sb);
 247         struct config_llog_data *cld;
 248         char logname[32];
 249
 250         if (IS_OST(lsi))
 251                 return NULL;
 252
 253         /* for osp-on-ost, see lustre_start_osp() */
 254         if (IS_MDT(lsi) && lcfg.cfg_instance)
 255                 return NULL;
 256
 257         /* we have to use different llog for clients and mdts for cmd
 258          * where only clients are notified if one of cmd server restarts */
 259         LASSERT(strlen(fsname) < sizeof(logname) / 2);
 260         strcpy(logname, fsname);
 261         if (IS_SERVER(lsi)) { /* mdt */
 262                 LASSERT(lcfg.cfg_instance == NULL);
 263                 lcfg.cfg_instance = sb;
 264                 strcat(logname, "-mdtir");
 265         } else {
 266                 LASSERT(lcfg.cfg_instance != NULL);
 267                 strcat(logname, "-cliir");
 268         }
 269
 270         cld = do_config_log_add(obd, logname, CONFIG_T_RECOVER, &lcfg, sb);
 271         return cld;
 272 }
 273
 274
 275 /** Add this log to the list of active logs watched by an MGC.
 276  * Active means we're watching for updates.
 277  * We have one active log per "mount" - client instance or servername.
 278  * Each instance may be at a different point in the log.
 279  */
 280 static int config_log_add(struct obd_device *obd, char *logname,
 281                           struct config_llog_instance *cfg,
 282                           struct super_block *sb)
 283 {
 284         struct lustre_sb_info *lsi = s2lsi(sb);
 285         struct config_llog_data *cld;
 286         struct config_llog_data *sptlrpc_cld;
 287         char                 seclogname[32];
 288         char                *ptr;
 289
 290         CDEBUG(D_MGC, "adding config log %s:%p\n", logname, cfg->cfg_instance);
 291
 292         /*
 293          * for each regular log, the depended sptlrpc log name is
 294          * <fsname>-sptlrpc. multiple regular logs may share one sptlrpc log.
 295          */
 296         ptr = strrchr(logname, '-');
 297         if (ptr == NULL || ptr - logname > 8) {
 298                 CERROR("logname %s is too long\n", logname);
 299                 return -EINVAL;
 300         }
 301
 302         memcpy(seclogname, logname, ptr - logname);
 303         strcpy(seclogname + (ptr - logname), "-sptlrpc");
 304
 305         sptlrpc_cld = config_log_find(seclogname, NULL);
 306         if (sptlrpc_cld == NULL) {
 307                 sptlrpc_cld = do_config_log_add(obd, seclogname,
 308                                                 CONFIG_T_SPTLRPC, NULL, NULL);
 309                 if (IS_ERR(sptlrpc_cld)) {
 310                         CERROR("can't create sptlrpc log: %s\n", seclogname);
 311                         return PTR_ERR(sptlrpc_cld);
 312                 }
 313         }
 314
 315         cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb);
 316         if (IS_ERR(cld)) {
 317                 CERROR("can't create log: %s\n", logname);
 318                 config_log_put(sptlrpc_cld);
 319                 return PTR_ERR(cld);
 320         }
 321
 322         cld->cld_sptlrpc = sptlrpc_cld;
 323
 324         LASSERT(lsi->lsi_lmd);
 325         if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR)) {
 326                 struct config_llog_data *recover_cld;
 327                 *strrchr(seclogname, '-') = 0;
 328                 recover_cld = config_recover_log_add(obd, seclogname, cfg, sb);
 329                 if (IS_ERR(recover_cld)) {
 330                         config_log_put(cld);
 331                         return PTR_ERR(recover_cld);
 332                 }
 333                 cld->cld_recover = recover_cld;
 334         }
 335
 336         return 0;
 337 }
 338
 339 DEFINE_MUTEX(llog_process_lock);
 340
 341 /** Stop watching for updates on this log.
 342  */
 343 static int config_log_end(char *logname, struct config_llog_instance *cfg)
 344 {
 345         struct config_llog_data *cld;
 346         struct config_llog_data *cld_sptlrpc = NULL;
 347         struct config_llog_data *cld_recover = NULL;
 348         int rc = 0;
 349
 350         cld = config_log_find(logname, cfg);
 351         if (cld == NULL)
 352                 return -ENOENT;
 353
 354         mutex_lock(&cld->cld_lock);
 355         /*
 356          * if cld_stopping is set, it means we didn't start the log thus
 357          * not owning the start ref. this can happen after previous umount:
 358          * the cld still hanging there waiting for lock cancel, and we
 359          * remount again but failed in the middle and call log_end without
 360          * calling start_log.
 361          */
 362         if (unlikely(cld->cld_stopping)) {
 363                 mutex_unlock(&cld->cld_lock);
 364                 /* drop the ref from the find */
 365                 config_log_put(cld);
 366                 return rc;
 367         }
 368
 369         cld->cld_stopping = 1;
 370
 371         cld_recover = cld->cld_recover;
 372         cld->cld_recover = NULL;
 373         mutex_unlock(&cld->cld_lock);
 374
 375         if (cld_recover) {
 376                 mutex_lock(&cld_recover->cld_lock);
 377                 cld_recover->cld_stopping = 1;
 378                 mutex_unlock(&cld_recover->cld_lock);
 379                 config_log_put(cld_recover);
 380         }
 381
 382         spin_lock(&config_list_lock);
 383         cld_sptlrpc = cld->cld_sptlrpc;
 384         cld->cld_sptlrpc = NULL;
 385         spin_unlock(&config_list_lock);
 386
 387         if (cld_sptlrpc)
 388                 config_log_put(cld_sptlrpc);
 389
 390         /* drop the ref from the find */
 391         config_log_put(cld);
 392         /* drop the start ref */
 393         config_log_put(cld);
 394
 395         CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
 396                rc);
 397         return rc;
 398 }
 399
 400 #ifdef LPROCFS
 401 int lprocfs_mgc_rd_ir_state(struct seq_file *m, void *data)
 402 {
 403         struct obd_device       *obd = data;
 404         struct obd_import       *imp = obd->u.cli.cl_import;
 405         struct obd_connect_data *ocd = &imp->imp_connect_data;
 406         struct config_llog_data *cld;
 407
 408         seq_printf(m, "imperative_recovery: %s\n",
 409                       OCD_HAS_FLAG(ocd, IMP_RECOV) ? "ENABLED" : "DISABLED");
 410         seq_printf(m, "client_state:\n");
 411
 412         spin_lock(&config_list_lock);
 413         list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 414                 if (cld->cld_recover == NULL)
 415                         continue;
 416                 seq_printf(m,  "    - { client: %s, nidtbl_version: %u }\n",
 417                                cld->cld_logname,
 418                                cld->cld_recover->cld_cfg.cfg_last_idx);
 419         }
 420         spin_unlock(&config_list_lock);
 421
 422         return 0;
 423 }
 424 #endif
 425
 426 /* reenqueue any lost locks */
 427 #define RQ_RUNNING 0x1
 428 #define RQ_NOW     0x2
 429 #define RQ_LATER   0x4
 430 #define RQ_STOP    0x8
 431 static int                  rq_state = 0;
 432 static wait_queue_head_t            rq_waitq;
 433 static DECLARE_COMPLETION(rq_exit);
 434
 435 static void do_requeue(struct config_llog_data *cld)
 436 {
 437         LASSERT(atomic_read(&cld->cld_refcount) > 0);
 438
 439         /* Do not run mgc_process_log on a disconnected export or an
 440            export which is being disconnected. Take the client
 441            semaphore to make the check non-racy. */
 442         down_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
 443         if (cld->cld_mgcexp->exp_obd->u.cli.cl_conn_count != 0) {
 444                 CDEBUG(D_MGC, "updating log %s\n", cld->cld_logname);
 445                 mgc_process_log(cld->cld_mgcexp->exp_obd, cld);
 446         } else {
 447                 CDEBUG(D_MGC, "disconnecting, won't update log %s\n",
 448                        cld->cld_logname);
 449         }
 450         up_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
 451 }
 452
 453 /* this timeout represents how many seconds MGC should wait before
 454  * requeue config and recover lock to the MGS. We need to randomize this
 455  * in order to not flood the MGS.
 456  */
 457 #define MGC_TIMEOUT_MIN_SECONDS   5
 458 #define MGC_TIMEOUT_RAND_CENTISEC 0x1ff /* ~500 */
 459
 460 static int mgc_requeue_thread(void *data)
 461 {
 462         int rc = 0;
 463
 464         CDEBUG(D_MGC, "Starting requeue thread\n");
 465
 466         /* Keep trying failed locks periodically */
 467         spin_lock(&config_list_lock);
 468         rq_state |= RQ_RUNNING;
 469         while (1) {
 470                 struct l_wait_info lwi;
 471                 struct config_llog_data *cld, *cld_prev;
 472                 int rand = cfs_rand() & MGC_TIMEOUT_RAND_CENTISEC;
 473                 int stopped = !!(rq_state & RQ_STOP);
 474                 int to;
 475
 476                 /* Any new or requeued lostlocks will change the state */
 477                 rq_state &= ~(RQ_NOW | RQ_LATER);
 478                 spin_unlock(&config_list_lock);
 479
 480                 /* Always wait a few seconds to allow the server who
 481                    caused the lock revocation to finish its setup, plus some
 482                    random so everyone doesn't try to reconnect at once. */
 483                 to = MGC_TIMEOUT_MIN_SECONDS * HZ;
 484                 to += rand * HZ / 100; /* rand is centi-seconds */
 485                 lwi = LWI_TIMEOUT(to, NULL, NULL);
 486                 l_wait_event(rq_waitq, rq_state & RQ_STOP, &lwi);
 487
 488                 /*
 489                  * iterate & processing through the list. for each cld, process
 490                  * its depending sptlrpc cld firstly (if any) and then itself.
 491                  *
 492                  * it's guaranteed any item in the list must have
 493                  * reference > 0; and if cld_lostlock is set, at
 494                  * least one reference is taken by the previous enqueue.
 495                  */
 496                 cld_prev = NULL;
 497
 498                 spin_lock(&config_list_lock);
 499                 list_for_each_entry(cld, &config_llog_list,
 500                                         cld_list_chain) {
 501                         if (!cld->cld_lostlock)
 502                                 continue;
 503
 504                         spin_unlock(&config_list_lock);
 505
 506                         LASSERT(atomic_read(&cld->cld_refcount) > 0);
 507
 508                         /* Whether we enqueued again or not in mgc_process_log,
 509                          * we're done with the ref from the old enqueue */
 510                         if (cld_prev)
 511                                 config_log_put(cld_prev);
 512                         cld_prev = cld;
 513
 514                         cld->cld_lostlock = 0;
 515                         if (likely(!stopped))
 516                                 do_requeue(cld);
 517
 518                         spin_lock(&config_list_lock);
 519                 }
 520                 spin_unlock(&config_list_lock);
 521                 if (cld_prev)
 522                         config_log_put(cld_prev);
 523
 524                 /* break after scanning the list so that we can drop
 525                  * refcount to losing lock clds */
 526                 if (unlikely(stopped)) {
 527                         spin_lock(&config_list_lock);
 528                         break;
 529                 }
 530
 531                 /* Wait a bit to see if anyone else needs a requeue */
 532                 lwi = (struct l_wait_info) { 0 };
 533                 l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP),
 534                              &lwi);
 535                 spin_lock(&config_list_lock);
 536         }
 537         /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
 538         rq_state &= ~RQ_RUNNING;
 539         spin_unlock(&config_list_lock);
 540
 541         complete(&rq_exit);
 542
 543         CDEBUG(D_MGC, "Ending requeue thread\n");
 544         return rc;
 545 }
 546
 547 /* Add a cld to the list to requeue.  Start the requeue thread if needed.
 548    We are responsible for dropping the config log reference from here on out. */
 549 static void mgc_requeue_add(struct config_llog_data *cld)
 550 {
 551         CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n",
 552                cld->cld_logname, atomic_read(&cld->cld_refcount),
 553                cld->cld_stopping, rq_state);
 554         LASSERT(atomic_read(&cld->cld_refcount) > 0);
 555
 556         mutex_lock(&cld->cld_lock);
 557         if (cld->cld_stopping || cld->cld_lostlock) {
 558                 mutex_unlock(&cld->cld_lock);
 559                 return;
 560         }
 561         /* this refcount will be released in mgc_requeue_thread. */
 562         config_log_get(cld);
 563         cld->cld_lostlock = 1;
 564         mutex_unlock(&cld->cld_lock);
 565
 566         /* Hold lock for rq_state */
 567         spin_lock(&config_list_lock);
 568         if (rq_state & RQ_STOP) {
 569                 spin_unlock(&config_list_lock);
 570                 cld->cld_lostlock = 0;
 571                 config_log_put(cld);
 572         } else {
 573                 rq_state |= RQ_NOW;
 574                 spin_unlock(&config_list_lock);
 575                 wake_up(&rq_waitq);
 576         }
 577 }
 578
 579 /********************** class fns **********************/
 580 static int mgc_local_llog_init(const struct lu_env *env,
 581                                struct obd_device *obd,
 582                                struct obd_device *disk)
 583 {
 584         struct llog_ctxt        *ctxt;
 585         int                      rc;
 586
 587         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_ORIG_CTXT, disk,
 588                         &llog_osd_ops);
 589         if (rc)
 590                 return rc;
 591
 592         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
 593         LASSERT(ctxt);
 594         ctxt->loc_dir = obd->u.cli.cl_mgc_configs_dir;
 595         llog_ctxt_put(ctxt);
 596
 597         return 0;
 598 }
 599
 600 static int mgc_local_llog_fini(const struct lu_env *env,
 601                                struct obd_device *obd)
 602 {
 603         struct llog_ctxt *ctxt;
 604
 605         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
 606         llog_cleanup(env, ctxt);
 607
 608         return 0;
 609 }
 610
 611 static int mgc_fs_setup(struct obd_device *obd, struct super_block *sb)
 612 {
 613         struct lustre_sb_info   *lsi = s2lsi(sb);
 614         struct client_obd       *cli = &obd->u.cli;
 615         struct lu_fid            rfid, fid;
 616         struct dt_object        *root, *dto;
 617         struct lu_env           *env;
 618         int                      rc = 0;
 619
 620         LASSERT(lsi);
 621         LASSERT(lsi->lsi_dt_dev);
 622
 623         OBD_ALLOC_PTR(env);
 624         if (env == NULL)
 625                 return -ENOMEM;
 626
 627         /* The mgc fs exclusion sem. Only one fs can be setup at a time. */
 628         down(&cli->cl_mgc_sem);
 629
 630         cfs_cleanup_group_info();
 631
 632         /* Setup the configs dir */
 633         rc = lu_env_init(env, LCT_MG_THREAD);
 634         if (rc)
 635                 GOTO(out_err, rc);
 636
 637         fid.f_seq = FID_SEQ_LOCAL_NAME;
 638         fid.f_oid = 1;
 639         fid.f_ver = 0;
 640         rc = local_oid_storage_init(env, lsi->lsi_dt_dev, &fid,
 641                                     &cli->cl_mgc_los);
 642         if (rc)
 643                 GOTO(out_env, rc);
 644
 645         rc = dt_root_get(env, lsi->lsi_dt_dev, &rfid);
 646         if (rc)
 647                 GOTO(out_env, rc);
 648
 649         root = dt_locate_at(env, lsi->lsi_dt_dev, &rfid,
 650                             &cli->cl_mgc_los->los_dev->dd_lu_dev);
 651         if (unlikely(IS_ERR(root)))
 652                 GOTO(out_los, rc = PTR_ERR(root));
 653
 654         dto = local_file_find_or_create(env, cli->cl_mgc_los, root,
 655                                         MOUNT_CONFIGS_DIR,
 656                                         S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
 657         lu_object_put_nocache(env, &root->do_lu);
 658         if (IS_ERR(dto))
 659                 GOTO(out_los, rc = PTR_ERR(dto));
 660
 661         cli->cl_mgc_configs_dir = dto;
 662
 663         LASSERT(lsi->lsi_osd_exp->exp_obd->obd_lvfs_ctxt.dt);
 664         rc = mgc_local_llog_init(env, obd, lsi->lsi_osd_exp->exp_obd);
 665         if (rc)
 666                 GOTO(out_llog, rc);
 667
 668         /* We take an obd ref to insure that we can't get to mgc_cleanup
 669          * without calling mgc_fs_cleanup first. */
 670         class_incref(obd, "mgc_fs", obd);
 671
 672         /* We keep the cl_mgc_sem until mgc_fs_cleanup */
 673 out_llog:
 674         if (rc) {
 675                 lu_object_put(env, &cli->cl_mgc_configs_dir->do_lu);
 676                 cli->cl_mgc_configs_dir = NULL;
 677         }
 678 out_los:
 679         if (rc < 0) {
 680                 local_oid_storage_fini(env, cli->cl_mgc_los);
 681                 cli->cl_mgc_los = NULL;
 682                 up(&cli->cl_mgc_sem);
 683         }
 684 out_env:
 685         lu_env_fini(env);
 686 out_err:
 687         OBD_FREE_PTR(env);
 688         return rc;
 689 }
 690
 691 static int mgc_fs_cleanup(struct obd_device *obd)
 692 {
 693         struct lu_env            env;
 694         struct client_obd       *cli = &obd->u.cli;
 695         int                      rc;
 696
 697         LASSERT(cli->cl_mgc_los != NULL);
 698
 699         rc = lu_env_init(&env, LCT_MG_THREAD);
 700         if (rc)
 701                 GOTO(unlock, rc);
 702
 703         mgc_local_llog_fini(&env, obd);
 704
 705         lu_object_put_nocache(&env, &cli->cl_mgc_configs_dir->do_lu);
 706         cli->cl_mgc_configs_dir = NULL;
 707
 708         local_oid_storage_fini(&env, cli->cl_mgc_los);
 709         cli->cl_mgc_los = NULL;
 710         lu_env_fini(&env);
 711
 712 unlock:
 713         class_decref(obd, "mgc_fs", obd);
 714         up(&cli->cl_mgc_sem);
 715
 716         return 0;
 717 }
 718
 719 static int mgc_llog_init(const struct lu_env *env, struct obd_device *obd)
 720 {
 721         struct llog_ctxt        *ctxt;
 722         int                      rc;
 723
 724         /* setup only remote ctxt, the local disk context is switched per each
 725          * filesystem during mgc_fs_setup() */
 726         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_REPL_CTXT, obd,
 727                         &llog_client_ops);
 728         if (rc)
 729                 return rc;
 730
 731         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 732         LASSERT(ctxt);
 733
 734         llog_initiator_connect(ctxt);
 735         llog_ctxt_put(ctxt);
 736
 737         return 0;
 738 }
 739
 740 static int mgc_llog_fini(const struct lu_env *env, struct obd_device *obd)
 741 {
 742         struct llog_ctxt *ctxt;
 743
 744         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 745         if (ctxt)
 746                 llog_cleanup(env, ctxt);
 747
 748         return 0;
 749 }
 750
 751 static atomic_t mgc_count = ATOMIC_INIT(0);
 752 static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
 753 {
 754         int rc = 0;
 755
 756         switch (stage) {
 757         case OBD_CLEANUP_EARLY:
 758                 break;
 759         case OBD_CLEANUP_EXPORTS:
 760                 if (atomic_dec_and_test(&mgc_count)) {
 761                         int running;
 762                         /* stop requeue thread */
 763                         spin_lock(&config_list_lock);
 764                         running = rq_state & RQ_RUNNING;
 765                         if (running)
 766                                 rq_state |= RQ_STOP;
 767                         spin_unlock(&config_list_lock);
 768                         if (running) {
 769                                 wake_up(&rq_waitq);
 770                                 wait_for_completion(&rq_exit);
 771                         }
 772                 }
 773                 obd_cleanup_client_import(obd);
 774                 rc = mgc_llog_fini(NULL, obd);
 775                 if (rc != 0)
 776                         CERROR("failed to cleanup llogging subsystems\n");
 777                 break;
 778         }
 779         return rc;
 780 }
 781
 782 static int mgc_cleanup(struct obd_device *obd)
 783 {
 784         int rc;
 785
 786         /* COMPAT_146 - old config logs may have added profiles we don't
 787            know about */
 788         if (obd->obd_type->typ_refcnt <= 1)
 789                 /* Only for the last mgc */
 790                 class_del_profiles();
 791
 792         lprocfs_obd_cleanup(obd);
 793         ptlrpcd_decref();
 794
 795         rc = client_obd_cleanup(obd);
 796         return rc;
 797 }
 798
 799 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 800 {
 801         struct lprocfs_static_vars lvars;
 802         int rc;
 803
 804         ptlrpcd_addref();
 805
 806         rc = client_obd_setup(obd, lcfg);
 807         if (rc)
 808                 GOTO(err_decref, rc);
 809
 810         rc = mgc_llog_init(NULL, obd);
 811         if (rc) {
 812                 CERROR("failed to setup llogging subsystems\n");
 813                 GOTO(err_cleanup, rc);
 814         }
 815
 816         lprocfs_mgc_init_vars(&lvars);
 817         lprocfs_obd_setup(obd, lvars.obd_vars);
 818         sptlrpc_lprocfs_cliobd_attach(obd);
 819
 820         if (atomic_inc_return(&mgc_count) == 1) {
 821                 rq_state = 0;
 822                 init_waitqueue_head(&rq_waitq);
 823
 824                 /* start requeue thread */
 825                 rc = PTR_ERR(kthread_run(mgc_requeue_thread, NULL,
 826                                              "ll_cfg_requeue"));
 827                 if (IS_ERR_VALUE(rc)) {
 828                         CERROR("%s: Cannot start requeue thread (%d),"
 829                                "no more log updates!\n",
 830                                obd->obd_name, rc);
 831                         GOTO(err_cleanup, rc);
 832                 }
 833                 /* rc is the task_struct pointer of mgc_requeue_thread. */
 834                 rc = 0;
 835         }
 836
 837         return rc;
 838
 839 err_cleanup:
 840         client_obd_cleanup(obd);
 841 err_decref:
 842         ptlrpcd_decref();
 843         return rc;
 844 }
 845
 846 /* based on ll_mdc_blocking_ast */
 847 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 848                             void *data, int flag)
 849 {
 850         struct lustre_handle lockh;
 851         struct config_llog_data *cld = (struct config_llog_data *)data;
 852         int rc = 0;
 853
 854         switch (flag) {
 855         case LDLM_CB_BLOCKING:
 856                 /* mgs wants the lock, give it up... */
 857                 LDLM_DEBUG(lock, "MGC blocking CB");
 858                 ldlm_lock2handle(lock, &lockh);
 859                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
 860                 break;
 861         case LDLM_CB_CANCELING:
 862                 /* We've given up the lock, prepare ourselves to update. */
 863                 LDLM_DEBUG(lock, "MGC cancel CB");
 864
 865                 CDEBUG(D_MGC, "Lock res "DLDLMRES" (%.8s)\n",
 866                        PLDLMRES(lock->l_resource),
 867                        (char *)&lock->l_resource->lr_name.name[0]);
 868
 869                 if (!cld) {
 870                         CDEBUG(D_INFO, "missing data, won't requeue\n");
 871                         break;
 872                 }
 873
 874                 /* held at mgc_process_log(). */
 875                 LASSERT(atomic_read(&cld->cld_refcount) > 0);
 876                 /* Are we done with this log? */
 877                 if (cld->cld_stopping) {
 878                         CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
 879                                cld->cld_logname);
 880                         config_log_put(cld);
 881                         break;
 882                 }
 883                 /* Make sure not to re-enqueue when the mgc is stopping
 884                    (we get called from client_disconnect_export) */
 885                 if (!lock->l_conn_export ||
 886                     !lock->l_conn_export->exp_obd->u.cli.cl_conn_count) {
 887                         CDEBUG(D_MGC, "log %.8s: disconnecting, won't requeue\n",
 888                                cld->cld_logname);
 889                         config_log_put(cld);
 890                         break;
 891                 }
 892
 893                 /* Re-enqueue now */
 894                 mgc_requeue_add(cld);
 895                 config_log_put(cld);
 896                 break;
 897         default:
 898                 LBUG();
 899         }
 900
 901         return rc;
 902 }
 903
 904 /* Not sure where this should go... */
 905 #define  MGC_ENQUEUE_LIMIT 50
 906 #define  MGC_TARGET_REG_LIMIT 10
 907 #define  MGC_SEND_PARAM_LIMIT 10
 908
 909 /* Send parameter to MGS*/
 910 static int mgc_set_mgs_param(struct obd_export *exp,
 911                              struct mgs_send_param *msp)
 912 {
 913         struct ptlrpc_request *req;
 914         struct mgs_send_param *req_msp, *rep_msp;
 915         int rc;
 916
 917         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
 918                                         &RQF_MGS_SET_INFO, LUSTRE_MGS_VERSION,
 919                                         MGS_SET_INFO);
 920         if (!req)
 921                 return -ENOMEM;
 922
 923         req_msp = req_capsule_client_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
 924         if (!req_msp) {
 925                 ptlrpc_req_finished(req);
 926                 return -ENOMEM;
 927         }
 928
 929         memcpy(req_msp, msp, sizeof(*req_msp));
 930         ptlrpc_request_set_replen(req);
 931
 932         /* Limit how long we will wait for the enqueue to complete */
 933         req->rq_delay_limit = MGC_SEND_PARAM_LIMIT;
 934         rc = ptlrpc_queue_wait(req);
 935         if (!rc) {
 936                 rep_msp = req_capsule_server_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
 937                 memcpy(msp, rep_msp, sizeof(*rep_msp));
 938         }
 939
 940         ptlrpc_req_finished(req);
 941
 942         return rc;
 943 }
 944
 945 /* Take a config lock so we can get cancel notifications */
 946 static int mgc_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm,
 947                        __u32 type, ldlm_policy_data_t *policy, __u32 mode,
 948                        __u64 *flags, void *bl_cb, void *cp_cb, void *gl_cb,
 949                        void *data, __u32 lvb_len, void *lvb_swabber,
 950                        struct lustre_handle *lockh)
 951 {
 952         struct config_llog_data *cld = (struct config_llog_data *)data;
 953         struct ldlm_enqueue_info einfo = {
 954                 .ei_type        = type,
 955                 .ei_mode        = mode,
 956                 .ei_cb_bl       = mgc_blocking_ast,
 957                 .ei_cb_cp       = ldlm_completion_ast,
 958         };
 959         struct ptlrpc_request *req;
 960         int short_limit = cld_is_sptlrpc(cld);
 961         int rc;
 962
 963         CDEBUG(D_MGC, "Enqueue for %s (res "LPX64")\n", cld->cld_logname,
 964                cld->cld_resid.name[0]);
 965
 966         /* We need a callback for every lockholder, so don't try to
 967            ldlm_lock_match (see rev 1.1.2.11.2.47) */
 968         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
 969                                         &RQF_LDLM_ENQUEUE, LUSTRE_DLM_VERSION,
 970                                         LDLM_ENQUEUE);
 971         if (req == NULL)
 972                 return -ENOMEM;
 973
 974         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, 0);
 975         ptlrpc_request_set_replen(req);
 976
 977         /* check if this is server or client */
 978         if (cld->cld_cfg.cfg_sb) {
 979                 struct lustre_sb_info *lsi = s2lsi(cld->cld_cfg.cfg_sb);
 980                 if (lsi && IS_SERVER(lsi))
 981                         short_limit = 1;
 982         }
 983         /* Limit how long we will wait for the enqueue to complete */
 984         req->rq_delay_limit = short_limit ? 5 : MGC_ENQUEUE_LIMIT;
 985         rc = ldlm_cli_enqueue(exp, &req, &einfo, &cld->cld_resid, NULL, flags,
 986                               NULL, 0, LVB_T_NONE, lockh, 0);
 987         /* A failed enqueue should still call the mgc_blocking_ast,
 988            where it will be requeued if needed ("grant failed"). */
 989         ptlrpc_req_finished(req);
 990         return rc;
 991 }
 992
 993 static int mgc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
 994                       __u32 mode, struct lustre_handle *lockh)
 995 {
 996         ldlm_lock_decref(lockh, mode);
 997
 998         return 0;
 999 }
1000
1001 static void mgc_notify_active(struct obd_device *unused)
1002 {
1003         /* wakeup mgc_requeue_thread to requeue mgc lock */
1004         spin_lock(&config_list_lock);
1005         rq_state |= RQ_NOW;
1006         spin_unlock(&config_list_lock);
1007         wake_up(&rq_waitq);
1008
1009         /* TODO: Help the MGS rebuild nidtbl. -jay */
1010 }
1011
1012 /* Send target_reg message to MGS */
1013 static int mgc_target_register(struct obd_export *exp,
1014                                struct mgs_target_info *mti)
1015 {
1016         struct ptlrpc_request  *req;
1017         struct mgs_target_info *req_mti, *rep_mti;
1018         int                  rc;
1019
1020         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1021                                         &RQF_MGS_TARGET_REG, LUSTRE_MGS_VERSION,
1022                                         MGS_TARGET_REG);
1023         if (req == NULL)
1024                 return -ENOMEM;
1025
1026         req_mti = req_capsule_client_get(&req->rq_pill, &RMF_MGS_TARGET_INFO);
1027         if (!req_mti) {
1028                 ptlrpc_req_finished(req);
1029                 return -ENOMEM;
1030         }
1031
1032         memcpy(req_mti, mti, sizeof(*req_mti));
1033         ptlrpc_request_set_replen(req);
1034         CDEBUG(D_MGC, "register %s\n", mti->mti_svname);
1035         /* Limit how long we will wait for the enqueue to complete */
1036         req->rq_delay_limit = MGC_TARGET_REG_LIMIT;
1037
1038         rc = ptlrpc_queue_wait(req);
1039         if (!rc) {
1040                 rep_mti = req_capsule_server_get(&req->rq_pill,
1041                                                  &RMF_MGS_TARGET_INFO);
1042                 memcpy(mti, rep_mti, sizeof(*rep_mti));
1043                 CDEBUG(D_MGC, "register %s got index = %d\n",
1044                        mti->mti_svname, mti->mti_stripe_index);
1045         }
1046         ptlrpc_req_finished(req);
1047
1048         return rc;
1049 }
1050
1051 int mgc_set_info_async(const struct lu_env *env, struct obd_export *exp,
1052                        obd_count keylen, void *key, obd_count vallen,
1053                        void *val, struct ptlrpc_request_set *set)
1054 {
1055         int rc = -EINVAL;
1056
1057         /* Turn off initial_recov after we try all backup servers once */
1058         if (KEY_IS(KEY_INIT_RECOV_BACKUP)) {
1059                 struct obd_import *imp = class_exp2cliimp(exp);
1060                 int value;
1061                 if (vallen != sizeof(int))
1062                         return -EINVAL;
1063                 value = *(int *)val;
1064                 CDEBUG(D_MGC, "InitRecov %s %d/d%d:i%d:r%d:or%d:%s\n",
1065                        imp->imp_obd->obd_name, value,
1066                        imp->imp_deactive, imp->imp_invalid,
1067                        imp->imp_replayable, imp->imp_obd->obd_replayable,
1068                        ptlrpc_import_state_name(imp->imp_state));
1069                 /* Resurrect if we previously died */
1070                 if ((imp->imp_state != LUSTRE_IMP_FULL &&
1071                      imp->imp_state != LUSTRE_IMP_NEW) || value > 1)
1072                         ptlrpc_reconnect_import(imp);
1073                 return 0;
1074         }
1075         /* FIXME move this to mgc_process_config */
1076         if (KEY_IS(KEY_REGISTER_TARGET)) {
1077                 struct mgs_target_info *mti;
1078                 if (vallen != sizeof(struct mgs_target_info))
1079                         return -EINVAL;
1080                 mti = (struct mgs_target_info *)val;
1081                 CDEBUG(D_MGC, "register_target %s %#x\n",
1082                        mti->mti_svname, mti->mti_flags);
1083                 rc =  mgc_target_register(exp, mti);
1084                 return rc;
1085         }
1086         if (KEY_IS(KEY_SET_FS)) {
1087                 struct super_block *sb = (struct super_block *)val;
1088
1089                 if (vallen != sizeof(struct super_block))
1090                         return -EINVAL;
1091
1092                 rc = mgc_fs_setup(exp->exp_obd, sb);
1093                 if (rc)
1094                         CERROR("set_fs got %d\n", rc);
1095
1096                 return rc;
1097         }
1098         if (KEY_IS(KEY_CLEAR_FS)) {
1099                 if (vallen != 0)
1100                         return -EINVAL;
1101                 rc = mgc_fs_cleanup(exp->exp_obd);
1102                 if (rc)
1103                         CERROR("clear_fs got %d\n", rc);
1104
1105                 return rc;
1106         }
1107         if (KEY_IS(KEY_SET_INFO)) {
1108                 struct mgs_send_param *msp;
1109
1110                 msp = (struct mgs_send_param *)val;
1111                 rc =  mgc_set_mgs_param(exp, msp);
1112                 return rc;
1113         }
1114         if (KEY_IS(KEY_MGSSEC)) {
1115                 struct client_obd     *cli = &exp->exp_obd->u.cli;
1116                 struct sptlrpc_flavor  flvr;
1117
1118                 /*
1119                  * empty string means using current flavor, if which haven't
1120                  * been set yet, set it as null.
1121                  *
1122                  * if flavor has been set previously, check the asking flavor
1123                  * must match the existing one.
1124                  */
1125                 if (vallen == 0) {
1126                         if (cli->cl_flvr_mgc.sf_rpc != SPTLRPC_FLVR_INVALID)
1127                                 return 0;
1128                         val = "null";
1129                         vallen = 4;
1130                 }
1131
1132                 rc = sptlrpc_parse_flavor(val, &flvr);
1133                 if (rc) {
1134                         CERROR("invalid sptlrpc flavor %s to MGS\n",
1135                                (char *) val);
1136                         return rc;
1137                 }
1138
1139                 /*
1140                  * caller already hold a mutex
1141                  */
1142                 if (cli->cl_flvr_mgc.sf_rpc == SPTLRPC_FLVR_INVALID) {
1143                         cli->cl_flvr_mgc = flvr;
1144                 } else if (memcmp(&cli->cl_flvr_mgc, &flvr,
1145                                   sizeof(flvr)) != 0) {
1146                         char    str[20];
1147
1148                         sptlrpc_flavor2name(&cli->cl_flvr_mgc,
1149                                             str, sizeof(str));
1150                         LCONSOLE_ERROR("asking sptlrpc flavor %s to MGS but "
1151                                        "currently %s is in use\n",
1152                                        (char *) val, str);
1153                         rc = -EPERM;
1154                 }
1155                 return rc;
1156         }
1157
1158         return rc;
1159 }
1160
1161 static int mgc_get_info(const struct lu_env *env, struct obd_export *exp,
1162                         __u32 keylen, void *key, __u32 *vallen, void *val,
1163                         struct lov_stripe_md *unused)
1164 {
1165         int rc = -EINVAL;
1166
1167         if (KEY_IS(KEY_CONN_DATA)) {
1168                 struct obd_import *imp = class_exp2cliimp(exp);
1169                 struct obd_connect_data *data = val;
1170
1171                 if (*vallen == sizeof(*data)) {
1172                         *data = imp->imp_connect_data;
1173                         rc = 0;
1174                 }
1175         }
1176
1177         return rc;
1178 }
1179
1180 static int mgc_import_event(struct obd_device *obd,
1181                             struct obd_import *imp,
1182                             enum obd_import_event event)
1183 {
1184         int rc = 0;
1185
1186         LASSERT(imp->imp_obd == obd);
1187         CDEBUG(D_MGC, "import event %#x\n", event);
1188
1189         switch (event) {
1190         case IMP_EVENT_DISCON:
1191                 /* MGC imports should not wait for recovery */
1192                 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1193                         ptlrpc_pinger_ir_down();
1194                 break;
1195         case IMP_EVENT_INACTIVE:
1196                 break;
1197         case IMP_EVENT_INVALIDATE: {
1198                 struct ldlm_namespace *ns = obd->obd_namespace;
1199                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
1200                 break;
1201         }
1202         case IMP_EVENT_ACTIVE:
1203                 CDEBUG(D_INFO, "%s: Reactivating import\n", obd->obd_name);
1204                 /* Clearing obd_no_recov allows us to continue pinging */
1205                 obd->obd_no_recov = 0;
1206                 mgc_notify_active(obd);
1207                 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1208                         ptlrpc_pinger_ir_up();
1209                 break;
1210         case IMP_EVENT_OCD:
1211                 break;
1212         case IMP_EVENT_DEACTIVATE:
1213         case IMP_EVENT_ACTIVATE:
1214                 break;
1215         default:
1216                 CERROR("Unknown import event %#x\n", event);
1217                 LBUG();
1218         }
1219         return rc;
1220 }
1221
1222 enum {
1223         CONFIG_READ_NRPAGES_INIT = 1 << (20 - PAGE_CACHE_SHIFT),
1224         CONFIG_READ_NRPAGES      = 4
1225 };
1226
1227 static int mgc_apply_recover_logs(struct obd_device *mgc,
1228                                   struct config_llog_data *cld,
1229                                   __u64 max_version,
1230                                   void *data, int datalen, bool mne_swab)
1231 {
1232         struct config_llog_instance *cfg = &cld->cld_cfg;
1233         struct lustre_sb_info       *lsi = s2lsi(cfg->cfg_sb);
1234         struct mgs_nidtbl_entry *entry;
1235         struct lustre_cfg       *lcfg;
1236         struct lustre_cfg_bufs   bufs;
1237         u64   prev_version = 0;
1238         char *inst;
1239         char *buf;
1240         int   bufsz;
1241         int   pos;
1242         int   rc  = 0;
1243         int   off = 0;
1244
1245         LASSERT(cfg->cfg_instance != NULL);
1246         LASSERT(cfg->cfg_sb == cfg->cfg_instance);
1247
1248         OBD_ALLOC(inst, PAGE_CACHE_SIZE);
1249         if (inst == NULL)
1250                 return -ENOMEM;
1251
1252         if (!IS_SERVER(lsi)) {
1253                 pos = snprintf(inst, PAGE_CACHE_SIZE, "%p", cfg->cfg_instance);
1254                 if (pos >= PAGE_CACHE_SIZE) {
1255                         OBD_FREE(inst, PAGE_CACHE_SIZE);
1256                         return -E2BIG;
1257                 }
1258         } else {
1259                 LASSERT(IS_MDT(lsi));
1260                 rc = server_name2svname(lsi->lsi_svname, inst, NULL,
1261                                         PAGE_CACHE_SIZE);
1262                 if (rc) {
1263                         OBD_FREE(inst, PAGE_CACHE_SIZE);
1264                         return -EINVAL;
1265                 }
1266                 pos = strlen(inst);
1267         }
1268
1269         ++pos;
1270         buf   = inst + pos;
1271         bufsz = PAGE_CACHE_SIZE - pos;
1272
1273         while (datalen > 0) {
1274                 int   entry_len = sizeof(*entry);
1275                 int   is_ost;
1276                 struct obd_device *obd;
1277                 char *obdname;
1278                 char *cname;
1279                 char *params;
1280                 char *uuid;
1281
1282                 rc = -EINVAL;
1283                 if (datalen < sizeof(*entry))
1284                         break;
1285
1286                 entry = (typeof(entry))(data + off);
1287
1288                 /* sanity check */
1289                 if (entry->mne_nid_type != 0) /* only support type 0 for ipv4 */
1290                         break;
1291                 if (entry->mne_nid_count == 0) /* at least one nid entry */
1292                         break;
1293                 if (entry->mne_nid_size != sizeof(lnet_nid_t))
1294                         break;
1295
1296                 entry_len += entry->mne_nid_count * entry->mne_nid_size;
1297                 if (datalen < entry_len) /* must have entry_len at least */
1298                         break;
1299
1300                 /* Keep this swab for normal mixed endian handling. LU-1644 */
1301                 if (mne_swab)
1302                         lustre_swab_mgs_nidtbl_entry(entry);
1303                 if (entry->mne_length > PAGE_CACHE_SIZE) {
1304                         CERROR("MNE too large (%u)\n", entry->mne_length);
1305                         break;
1306                 }
1307
1308                 if (entry->mne_length < entry_len)
1309                         break;
1310
1311                 off     += entry->mne_length;
1312                 datalen -= entry->mne_length;
1313                 if (datalen < 0)
1314                         break;
1315
1316                 if (entry->mne_version > max_version) {
1317                         CERROR("entry index(%lld) is over max_index(%lld)\n",
1318                                entry->mne_version, max_version);
1319                         break;
1320                 }
1321
1322                 if (prev_version >= entry->mne_version) {
1323                         CERROR("index unsorted, prev %lld, now %lld\n",
1324                                prev_version, entry->mne_version);
1325                         break;
1326                 }
1327                 prev_version = entry->mne_version;
1328
1329                 /*
1330                  * Write a string with format "nid::instance" to
1331                  * lustre/<osc|mdc>/<target>-<osc|mdc>-<instance>/import.
1332                  */
1333
1334                 is_ost = entry->mne_type == LDD_F_SV_TYPE_OST;
1335                 memset(buf, 0, bufsz);
1336                 obdname = buf;
1337                 pos = 0;
1338
1339                 /* lustre-OST0001-osc-<instance #> */
1340                 strcpy(obdname, cld->cld_logname);
1341                 cname = strrchr(obdname, '-');
1342                 if (cname == NULL) {
1343                         CERROR("mgc %s: invalid logname %s\n",
1344                                mgc->obd_name, obdname);
1345                         break;
1346                 }
1347
1348                 pos = cname - obdname;
1349                 obdname[pos] = 0;
1350                 pos += sprintf(obdname + pos, "-%s%04x",
1351                                   is_ost ? "OST" : "MDT", entry->mne_index);
1352
1353                 cname = is_ost ? "osc" : "mdc",
1354                 pos += sprintf(obdname + pos, "-%s-%s", cname, inst);
1355                 lustre_cfg_bufs_reset(&bufs, obdname);
1356
1357                 /* find the obd by obdname */
1358                 obd = class_name2obd(obdname);
1359                 if (obd == NULL) {
1360                         CDEBUG(D_INFO, "mgc %s: cannot find obdname %s\n",
1361                                mgc->obd_name, obdname);
1362                         rc = 0;
1363                         /* this is a safe race, when the ost is starting up...*/
1364                         continue;
1365                 }
1366
1367                 /* osc.import = "connection=<Conn UUID>::<target instance>" */
1368                 ++pos;
1369                 params = buf + pos;
1370                 pos += sprintf(params, "%s.import=%s", cname, "connection=");
1371                 uuid = buf + pos;
1372
1373                 down_read(&obd->u.cli.cl_sem);
1374                 if (obd->u.cli.cl_import == NULL) {
1375                         /* client does not connect to the OST yet */
1376                         up_read(&obd->u.cli.cl_sem);
1377                         rc = 0;
1378                         continue;
1379                 }
1380
1381                 /* TODO: iterate all nids to find one */
1382                 /* find uuid by nid */
1383                 rc = client_import_find_conn(obd->u.cli.cl_import,
1384                                              entry->u.nids[0],
1385                                              (struct obd_uuid *)uuid);
1386                 up_read(&obd->u.cli.cl_sem);
1387                 if (rc < 0) {
1388                         CERROR("mgc: cannot find uuid by nid %s\n",
1389                                libcfs_nid2str(entry->u.nids[0]));
1390                         break;
1391                 }
1392
1393                 CDEBUG(D_INFO, "Find uuid %s by nid %s\n",
1394                        uuid, libcfs_nid2str(entry->u.nids[0]));
1395
1396                 pos += strlen(uuid);
1397                 pos += sprintf(buf + pos, "::%u", entry->mne_instance);
1398                 LASSERT(pos < bufsz);
1399
1400                 lustre_cfg_bufs_set_string(&bufs, 1, params);
1401
1402                 rc = -ENOMEM;
1403                 lcfg = lustre_cfg_new(LCFG_PARAM, &bufs);
1404                 if (lcfg == NULL) {
1405                         CERROR("mgc: cannot allocate memory\n");
1406                         break;
1407                 }
1408
1409                 CDEBUG(D_INFO, "ir apply logs "LPD64"/"LPD64" for %s -> %s\n",
1410                        prev_version, max_version, obdname, params);
1411
1412                 rc = class_process_config(lcfg);
1413                 lustre_cfg_free(lcfg);
1414                 if (rc)
1415                         CDEBUG(D_INFO, "process config for %s error %d\n",
1416                                obdname, rc);
1417
1418                 /* continue, even one with error */
1419         }
1420
1421         OBD_FREE(inst, PAGE_CACHE_SIZE);
1422         return rc;
1423 }
1424
1425 /**
1426  * This function is called if this client was notified for target restarting
1427  * by the MGS. A CONFIG_READ RPC is going to send to fetch recovery logs.
1428  */
1429 static int mgc_process_recover_log(struct obd_device *obd,
1430                                    struct config_llog_data *cld)
1431 {
1432         struct ptlrpc_request *req = NULL;
1433         struct config_llog_instance *cfg = &cld->cld_cfg;
1434         struct mgs_config_body *body;
1435         struct mgs_config_res  *res;
1436         struct ptlrpc_bulk_desc *desc;
1437         struct page **pages;
1438         int nrpages;
1439         bool eof = true;
1440         bool mne_swab = false;
1441         int i;
1442         int ealen;
1443         int rc;
1444
1445         /* allocate buffer for bulk transfer.
1446          * if this is the first time for this mgs to read logs,
1447          * CONFIG_READ_NRPAGES_INIT will be used since it will read all logs
1448          * once; otherwise, it only reads increment of logs, this should be
1449          * small and CONFIG_READ_NRPAGES will be used.
1450          */
1451         nrpages = CONFIG_READ_NRPAGES;
1452         if (cfg->cfg_last_idx == 0) /* the first time */
1453                 nrpages = CONFIG_READ_NRPAGES_INIT;
1454
1455         OBD_ALLOC(pages, sizeof(*pages) * nrpages);
1456         if (pages == NULL)
1457                 GOTO(out, rc = -ENOMEM);
1458
1459         for (i = 0; i < nrpages; i++) {
1460                 pages[i] = alloc_page(GFP_IOFS);
1461                 if (pages[i] == NULL)
1462                         GOTO(out, rc = -ENOMEM);
1463         }
1464
1465 again:
1466         LASSERT(cld_is_recover(cld));
1467         LASSERT(mutex_is_locked(&cld->cld_lock));
1468         req = ptlrpc_request_alloc(class_exp2cliimp(cld->cld_mgcexp),
1469                                    &RQF_MGS_CONFIG_READ);
1470         if (req == NULL)
1471                 GOTO(out, rc = -ENOMEM);
1472
1473         rc = ptlrpc_request_pack(req, LUSTRE_MGS_VERSION, MGS_CONFIG_READ);
1474         if (rc)
1475                 GOTO(out, rc);
1476
1477         /* pack request */
1478         body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
1479         LASSERT(body != NULL);
1480         LASSERT(sizeof(body->mcb_name) > strlen(cld->cld_logname));
1481         if (strlcpy(body->mcb_name, cld->cld_logname, sizeof(body->mcb_name))
1482             >= sizeof(body->mcb_name))
1483                 GOTO(out, rc = -E2BIG);
1484         body->mcb_offset = cfg->cfg_last_idx + 1;
1485         body->mcb_type   = cld->cld_type;
1486         body->mcb_bits   = PAGE_CACHE_SHIFT;
1487         body->mcb_units  = nrpages;
1488
1489         /* allocate bulk transfer descriptor */
1490         desc = ptlrpc_prep_bulk_imp(req, nrpages, 1, BULK_PUT_SINK,
1491                                     MGS_BULK_PORTAL);
1492         if (desc == NULL)
1493                 GOTO(out, rc = -ENOMEM);
1494
1495         for (i = 0; i < nrpages; i++)
1496                 ptlrpc_prep_bulk_page_pin(desc, pages[i], 0, PAGE_CACHE_SIZE);
1497
1498         ptlrpc_request_set_replen(req);
1499         rc = ptlrpc_queue_wait(req);
1500         if (rc)
1501                 GOTO(out, rc);
1502
1503         res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
1504         if (res->mcr_size < res->mcr_offset)
1505                 GOTO(out, rc = -EINVAL);
1506
1507         /* always update the index even though it might have errors with
1508          * handling the recover logs */
1509         cfg->cfg_last_idx = res->mcr_offset;
1510         eof = res->mcr_offset == res->mcr_size;
1511
1512         CDEBUG(D_INFO, "Latest version "LPD64", more %d.\n",
1513                res->mcr_offset, eof == false);
1514
1515         ealen = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, 0);
1516         if (ealen < 0)
1517                 GOTO(out, rc = ealen);
1518
1519         if (ealen > nrpages << PAGE_CACHE_SHIFT)
1520                 GOTO(out, rc = -EINVAL);
1521
1522         if (ealen == 0) { /* no logs transferred */
1523                 if (!eof)
1524                         rc = -EINVAL;
1525                 GOTO(out, rc);
1526         }
1527
1528         mne_swab = !!ptlrpc_rep_need_swab(req);
1529 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 50, 0)
1530         /* This import flag means the server did an extra swab of IR MNE
1531          * records (fixed in LU-1252), reverse it here if needed. LU-1644 */
1532         if (unlikely(req->rq_import->imp_need_mne_swab))
1533                 mne_swab = !mne_swab;
1534 #else
1535 #warning "LU-1644: Remove old OBD_CONNECT_MNE_SWAB fixup and imp_need_mne_swab"
1536 #endif
1537
1538         for (i = 0; i < nrpages && ealen > 0; i++) {
1539                 int rc2;
1540                 void *ptr;
1541
1542                 ptr = kmap(pages[i]);
1543                 rc2 = mgc_apply_recover_logs(obd, cld, res->mcr_offset, ptr,
1544                                              min_t(int, ealen, PAGE_CACHE_SIZE),
1545                                              mne_swab);
1546                 kunmap(pages[i]);
1547                 if (rc2 < 0) {
1548                         CWARN("Process recover log %s error %d\n",
1549                               cld->cld_logname, rc2);
1550                         break;
1551                 }
1552
1553                 ealen -= PAGE_CACHE_SIZE;
1554         }
1555
1556 out:
1557         if (req)
1558                 ptlrpc_req_finished(req);
1559
1560         if (rc == 0 && !eof)
1561                 goto again;
1562
1563         if (pages) {
1564                 for (i = 0; i < nrpages; i++) {
1565                         if (pages[i] == NULL)
1566                                 break;
1567                         __free_page(pages[i]);
1568                 }
1569                 OBD_FREE(pages, sizeof(*pages) * nrpages);
1570         }
1571         return rc;
1572 }
1573
1574 static int mgc_llog_local_copy(const struct lu_env *env,
1575                                struct obd_device *obd,
1576                                struct llog_ctxt *rctxt,
1577                                struct llog_ctxt *lctxt, char *logname)
1578 {
1579         char    *temp_log;
1580         int      rc;
1581
1582
1583
1584         /*
1585          * - copy it to backup using llog_backup()
1586          * - copy remote llog to logname using llog_backup()
1587          * - if failed then move bakup to logname again
1588          */
1589
1590         OBD_ALLOC(temp_log, strlen(logname) + 1);
1591         if (!temp_log)
1592                 return -ENOMEM;
1593         sprintf(temp_log, "%sT", logname);
1594
1595         /* make a copy of local llog at first */
1596         rc = llog_backup(env, obd, lctxt, lctxt, logname, temp_log);
1597         if (rc < 0 && rc != -ENOENT)
1598                 GOTO(out, rc);
1599         /* copy remote llog to the local copy */
1600         rc = llog_backup(env, obd, rctxt, lctxt, logname, logname);
1601         if (rc == -ENOENT) {
1602                 /* no remote llog, delete local one too */
1603                 llog_erase(env, lctxt, NULL, logname);
1604         } else if (rc < 0) {
1605                 /* error during backup, get local one back from the copy */
1606                 llog_backup(env, obd, lctxt, lctxt, temp_log, logname);
1607 out:
1608                 CERROR("%s: failed to copy remote log %s: rc = %d\n",
1609                        obd->obd_name, logname, rc);
1610         }
1611         llog_erase(env, lctxt, NULL, temp_log);
1612         OBD_FREE(temp_log, strlen(logname) + 1);
1613         return rc;
1614 }
1615
1616 /* local_only means it cannot get remote llogs */
1617 static int mgc_process_cfg_log(struct obd_device *mgc,
1618                                struct config_llog_data *cld, int local_only)
1619 {
1620         struct llog_ctxt        *ctxt, *lctxt = NULL;
1621         struct dt_object        *cl_mgc_dir = mgc->u.cli.cl_mgc_configs_dir;
1622         struct lustre_sb_info   *lsi = NULL;
1623         int                      rc = 0;
1624         bool                     sptlrpc_started = false;
1625         struct lu_env           *env;
1626
1627         LASSERT(cld);
1628         LASSERT(mutex_is_locked(&cld->cld_lock));
1629
1630         /*
1631          * local copy of sptlrpc log is controlled elsewhere, don't try to
1632          * read it up here.
1633          */
1634         if (cld_is_sptlrpc(cld) && local_only)
1635                 return 0;
1636
1637         if (cld->cld_cfg.cfg_sb)
1638                 lsi = s2lsi(cld->cld_cfg.cfg_sb);
1639
1640         OBD_ALLOC_PTR(env);
1641         if (env == NULL)
1642                 return -ENOMEM;
1643
1644         rc = lu_env_init(env, LCT_MG_THREAD);
1645         if (rc)
1646                 GOTO(out_free, rc);
1647
1648         ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1649         LASSERT(ctxt);
1650
1651         lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT);
1652
1653         /* Copy the setup log locally if we can. Don't mess around if we're
1654          * running an MGS though (logs are already local). */
1655         if (lctxt && lsi && IS_SERVER(lsi) && !IS_MGS(lsi) &&
1656             cl_mgc_dir != NULL &&
1657             lu2dt_dev(cl_mgc_dir->do_lu.lo_dev) == lsi->lsi_dt_dev) {
1658                 if (!local_only)
1659                         /* Only try to copy log if we have the lock. */
1660                         rc = mgc_llog_local_copy(env, mgc, ctxt, lctxt,
1661                                                  cld->cld_logname);
1662                 if (local_only || rc) {
1663                         if (llog_is_empty(env, lctxt, cld->cld_logname)) {
1664                                 LCONSOLE_ERROR_MSG(0x13a,
1665                                                    "Failed to get MGS log %s and no local copy.\n",
1666                                                    cld->cld_logname);
1667                                 GOTO(out_pop, rc = -ENOTCONN);
1668                         }
1669                         CDEBUG(D_MGC,
1670                                "Failed to get MGS log %s, using local copy for now, will try to update later.\n",
1671                                cld->cld_logname);
1672                 }
1673                 /* Now, whether we copied or not, start using the local llog.
1674                  * If we failed to copy, we'll start using whatever the old
1675                  * log has. */
1676                 llog_ctxt_put(ctxt);
1677                 ctxt = lctxt;
1678                 lctxt = NULL;
1679         } else {
1680                 if (local_only) /* no local log at client side */
1681                         GOTO(out_pop, rc = -EIO);
1682         }
1683
1684         if (cld_is_sptlrpc(cld)) {
1685                 sptlrpc_conf_log_update_begin(cld->cld_logname);
1686                 sptlrpc_started = true;
1687         }
1688
1689         /* logname and instance info should be the same, so use our
1690          * copy of the instance for the update.  The cfg_last_idx will
1691          * be updated here. */
1692         rc = class_config_parse_llog(env, ctxt, cld->cld_logname,
1693                                      &cld->cld_cfg);
1694
1695 out_pop:
1696         __llog_ctxt_put(env, ctxt);
1697         if (lctxt)
1698                 __llog_ctxt_put(env, lctxt);
1699
1700         /*
1701          * update settings on existing OBDs. doing it inside
1702          * of llog_process_lock so no device is attaching/detaching
1703          * in parallel.
1704          * the logname must be <fsname>-sptlrpc
1705          */
1706         if (sptlrpc_started) {
1707                 LASSERT(cld_is_sptlrpc(cld));
1708                 sptlrpc_conf_log_update_end(cld->cld_logname);
1709                 class_notify_sptlrpc_conf(cld->cld_logname,
1710                                           strlen(cld->cld_logname) -
1711                                           strlen("-sptlrpc"));
1712         }
1713
1714         lu_env_fini(env);
1715 out_free:
1716         OBD_FREE_PTR(env);
1717         return rc;
1718 }
1719
1720 /** Get a config log from the MGS and process it.
1721  * This func is called for both clients and servers.
1722  * Copy the log locally before parsing it if appropriate (non-MGS server)
1723  */
1724 int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)
1725 {
1726         struct lustre_handle lockh = { 0 };
1727         __u64 flags = LDLM_FL_NO_LRU;
1728         int rc = 0, rcl;
1729
1730         LASSERT(cld);
1731
1732         /* I don't want multiple processes running process_log at once --
1733            sounds like badness.  It actually might be fine, as long as
1734            we're not trying to update from the same log
1735            simultaneously (in which case we should use a per-log sem.) */
1736         mutex_lock(&cld->cld_lock);
1737         if (cld->cld_stopping) {
1738                 mutex_unlock(&cld->cld_lock);
1739                 return 0;
1740         }
1741
1742         OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PAUSE_PROCESS_LOG, 20);
1743
1744         CDEBUG(D_MGC, "Process log %s:%p from %d\n", cld->cld_logname,
1745                cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
1746
1747         /* Get the cfg lock on the llog */
1748         rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, NULL, LDLM_PLAIN, NULL,
1749                           LCK_CR, &flags, NULL, NULL, NULL,
1750                           cld, 0, NULL, &lockh);
1751         if (rcl == 0) {
1752                 /* Get the cld, it will be released in mgc_blocking_ast. */
1753                 config_log_get(cld);
1754                 rc = ldlm_lock_set_data(&lockh, (void *)cld);
1755                 LASSERT(rc == 0);
1756         } else {
1757                 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
1758
1759                 /* mark cld_lostlock so that it will requeue
1760                  * after MGC becomes available. */
1761                 cld->cld_lostlock = 1;
1762                 /* Get extra reference, it will be put in requeue thread */
1763                 config_log_get(cld);
1764         }
1765
1766
1767         if (cld_is_recover(cld)) {
1768                 rc = 0; /* this is not a fatal error for recover log */
1769                 if (rcl == 0)
1770                         rc = mgc_process_recover_log(mgc, cld);
1771         } else {
1772                 rc = mgc_process_cfg_log(mgc, cld, rcl != 0);
1773         }
1774
1775         CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
1776                mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
1777
1778         mutex_unlock(&cld->cld_lock);
1779
1780         /* Now drop the lock so MGS can revoke it */
1781         if (!rcl) {
1782                 rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, NULL,
1783                                  LCK_CR, &lockh);
1784                 if (rcl)
1785                         CERROR("Can't drop cfg lock: %d\n", rcl);
1786         }
1787
1788         return rc;
1789 }
1790
1791
1792 /** Called from lustre_process_log.
1793  * LCFG_LOG_START gets the config log from the MGS, processes it to start
1794  * any services, and adds it to the list logs to watch (follow).
1795  */
1796 static int mgc_process_config(struct obd_device *obd, obd_count len, void *buf)
1797 {
1798         struct lustre_cfg *lcfg = buf;
1799         struct config_llog_instance *cfg = NULL;
1800         char *logname;
1801         int rc = 0;
1802
1803         switch (lcfg->lcfg_command) {
1804         case LCFG_LOV_ADD_OBD: {
1805                 /* Overloading this cfg command: register a new target */
1806                 struct mgs_target_info *mti;
1807
1808                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
1809                     sizeof(struct mgs_target_info))
1810                         GOTO(out, rc = -EINVAL);
1811
1812                 mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1);
1813                 CDEBUG(D_MGC, "add_target %s %#x\n",
1814                        mti->mti_svname, mti->mti_flags);
1815                 rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti);
1816                 break;
1817         }
1818         case LCFG_LOV_DEL_OBD:
1819                 /* Unregister has no meaning at the moment. */
1820                 CERROR("lov_del_obd unimplemented\n");
1821                 rc = -ENOSYS;
1822                 break;
1823         case LCFG_SPTLRPC_CONF: {
1824                 rc = sptlrpc_process_config(lcfg);
1825                 break;
1826         }
1827         case LCFG_LOG_START: {
1828                 struct config_llog_data *cld;
1829                 struct super_block *sb;
1830
1831                 logname = lustre_cfg_string(lcfg, 1);
1832                 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
1833                 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
1834
1835                 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
1836                        cfg->cfg_last_idx);
1837
1838                 /* We're only called through here on the initial mount */
1839                 rc = config_log_add(obd, logname, cfg, sb);
1840                 if (rc)
1841                         break;
1842                 cld = config_log_find(logname, cfg);
1843                 if (cld == NULL) {
1844                         rc = -ENOENT;
1845                         break;
1846                 }
1847
1848                 /* COMPAT_146 */
1849                 /* FIXME only set this for old logs!  Right now this forces
1850                    us to always skip the "inside markers" check */
1851                 cld->cld_cfg.cfg_flags |= CFG_F_COMPAT146;
1852
1853                 rc = mgc_process_log(obd, cld);
1854                 if (rc == 0 && cld->cld_recover != NULL) {
1855                         if (OCD_HAS_FLAG(&obd->u.cli.cl_import->
1856                                          imp_connect_data, IMP_RECOV)) {
1857                                 rc = mgc_process_log(obd, cld->cld_recover);
1858                         } else {
1859                                 struct config_llog_data *cir = cld->cld_recover;
1860                                 cld->cld_recover = NULL;
1861                                 config_log_put(cir);
1862                         }
1863                         if (rc)
1864                                 CERROR("Cannot process recover llog %d\n", rc);
1865                 }
1866                 config_log_put(cld);
1867
1868                 break;
1869         }
1870         case LCFG_LOG_END: {
1871                 logname = lustre_cfg_string(lcfg, 1);
1872
1873                 if (lcfg->lcfg_bufcount >= 2)
1874                         cfg = (struct config_llog_instance *)lustre_cfg_buf(
1875                                 lcfg, 2);
1876                 rc = config_log_end(logname, cfg);
1877                 break;
1878         }
1879         default: {
1880                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1881                 GOTO(out, rc = -EINVAL);
1882
1883         }
1884         }
1885 out:
1886         return rc;
1887 }
1888
1889 struct obd_ops mgc_obd_ops = {
1890         .o_owner        = THIS_MODULE,
1891         .o_setup        = mgc_setup,
1892         .o_precleanup   = mgc_precleanup,
1893         .o_cleanup      = mgc_cleanup,
1894         .o_add_conn     = client_import_add_conn,
1895         .o_del_conn     = client_import_del_conn,
1896         .o_connect      = client_connect_import,
1897         .o_disconnect   = client_disconnect_export,
1898         /* .o_enqueue      = mgc_enqueue, */
1899         .o_cancel       = mgc_cancel,
1900         /* .o_iocontrol    = mgc_iocontrol, */
1901         .o_set_info_async = mgc_set_info_async,
1902         .o_get_info       = mgc_get_info,
1903         .o_import_event = mgc_import_event,
1904         .o_process_config = mgc_process_config,
1905 };
1906
1907 int __init mgc_init(void)
1908 {
1909         return class_register_type(&mgc_obd_ops, NULL, NULL,
1910                                    LUSTRE_MGC_NAME, NULL);
1911 }
1912
1913 static void /*__exit*/ mgc_exit(void)
1914 {
1915         class_unregister_type(LUSTRE_MGC_NAME);
1916 }
1917
1918 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1919 MODULE_DESCRIPTION("Lustre Management Client");
1920 MODULE_LICENSE("GPL");
1921
1922 module_init(mgc_init);
1923 module_exit(mgc_exit);