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 > sizeof(resname)) {
  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         case CONFIG_T_PARAMS:
  80                 resname = type;
  81                 break;
  82         default:
  83                 LBUG();
  84         }
  85         res_id->name[1] = cpu_to_le64(resname);
  86         CDEBUG(D_MGC, "log %s to resid "LPX64"/"LPX64" (%.8s)\n", name,
  87                res_id->name[0], res_id->name[1], (char *)&res_id->name[0]);
  88         return 0;
  89 }
  90
  91 int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type)
  92 {
  93         /* fsname is at most 8 chars long, maybe contain "-".
  94          * e.g. "lustre", "SUN-000" */
  95         return mgc_name2resid(fsname, strlen(fsname), res_id, type);
  96 }
  97 EXPORT_SYMBOL(mgc_fsname2resid);
  98
  99 int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id, int type)
 100 {
 101         char *name_end;
 102         int len;
 103
 104         /* logname consists of "fsname-nodetype".
 105          * e.g. "lustre-MDT0001", "SUN-000-client"
 106          * there is an exception: llog "params" */
 107         name_end = strrchr(logname, '-');
 108         if (!name_end)
 109                 len = strlen(logname);
 110         else
 111                 len = name_end - logname;
 112         return mgc_name2resid(logname, len, res_id, type);
 113 }
 114
 115 /********************** config llog list **********************/
 116 static LIST_HEAD(config_llog_list);
 117 static DEFINE_SPINLOCK(config_list_lock);
 118
 119 /* Take a reference to a config log */
 120 static int config_log_get(struct config_llog_data *cld)
 121 {
 122         atomic_inc(&cld->cld_refcount);
 123         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
 124                atomic_read(&cld->cld_refcount));
 125         return 0;
 126 }
 127
 128 /* Drop a reference to a config log.  When no longer referenced,
 129    we can free the config log data */
 130 static void config_log_put(struct config_llog_data *cld)
 131 {
 132         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
 133                atomic_read(&cld->cld_refcount));
 134         LASSERT(atomic_read(&cld->cld_refcount) > 0);
 135
 136         /* spinlock to make sure no item with 0 refcount in the list */
 137         if (atomic_dec_and_lock(&cld->cld_refcount, &config_list_lock)) {
 138                 list_del(&cld->cld_list_chain);
 139                 spin_unlock(&config_list_lock);
 140
 141                 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
 142
 143                 if (cld->cld_recover)
 144                         config_log_put(cld->cld_recover);
 145                 if (cld->cld_sptlrpc)
 146                         config_log_put(cld->cld_sptlrpc);
 147                 if (cld->cld_params)
 148                         config_log_put(cld->cld_params);
 149                 if (cld_is_sptlrpc(cld))
 150                         sptlrpc_conf_log_stop(cld->cld_logname);
 151
 152                 class_export_put(cld->cld_mgcexp);
 153                 OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1);
 154         }
 155 }
 156
 157 /* Find a config log by name */
 158 static
 159 struct config_llog_data *config_log_find(char *logname,
 160                                          struct config_llog_instance *cfg)
 161 {
 162         struct config_llog_data *cld;
 163         struct config_llog_data *found = NULL;
 164         void *             instance;
 165
 166         LASSERT(logname != NULL);
 167
 168         instance = cfg ? cfg->cfg_instance : NULL;
 169         spin_lock(&config_list_lock);
 170         list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 171                 /* check if instance equals */
 172                 if (instance != cld->cld_cfg.cfg_instance)
 173                         continue;
 174
 175                 /* instance may be NULL, should check name */
 176                 if (strcmp(logname, cld->cld_logname) == 0) {
 177                         found = cld;
 178                         break;
 179                 }
 180         }
 181         if (found) {
 182                 atomic_inc(&found->cld_refcount);
 183                 LASSERT(found->cld_stopping == 0 || cld_is_sptlrpc(found) == 0);
 184         }
 185         spin_unlock(&config_list_lock);
 186         return found;
 187 }
 188
 189 static
 190 struct config_llog_data *do_config_log_add(struct obd_device *obd,
 191                                            char *logname,
 192                                            int type,
 193                                            struct config_llog_instance *cfg,
 194                                            struct super_block *sb)
 195 {
 196         struct config_llog_data *cld;
 197         int                   rc;
 198
 199         CDEBUG(D_MGC, "do adding config log %s:%p\n", logname,
 200                cfg ? cfg->cfg_instance : 0);
 201
 202         OBD_ALLOC(cld, sizeof(*cld) + strlen(logname) + 1);
 203         if (!cld)
 204                 return ERR_PTR(-ENOMEM);
 205
 206         strcpy(cld->cld_logname, logname);
 207         if (cfg)
 208                 cld->cld_cfg = *cfg;
 209         else
 210                 cld->cld_cfg.cfg_callback = class_config_llog_handler;
 211         mutex_init(&cld->cld_lock);
 212         cld->cld_cfg.cfg_last_idx = 0;
 213         cld->cld_cfg.cfg_flags = 0;
 214         cld->cld_cfg.cfg_sb = sb;
 215         cld->cld_type = type;
 216         atomic_set(&cld->cld_refcount, 1);
 217
 218         /* Keep the mgc around until we are done */
 219         cld->cld_mgcexp = class_export_get(obd->obd_self_export);
 220
 221         if (cld_is_sptlrpc(cld)) {
 222                 sptlrpc_conf_log_start(logname);
 223                 cld->cld_cfg.cfg_obdname = obd->obd_name;
 224         }
 225
 226         rc = mgc_logname2resid(logname, &cld->cld_resid, type);
 227
 228         spin_lock(&config_list_lock);
 229         list_add(&cld->cld_list_chain, &config_llog_list);
 230         spin_unlock(&config_list_lock);
 231
 232         if (rc) {
 233                 config_log_put(cld);
 234                 return ERR_PTR(rc);
 235         }
 236
 237         if (cld_is_sptlrpc(cld)) {
 238                 rc = mgc_process_log(obd, cld);
 239                 if (rc && rc != -ENOENT)
 240                         CERROR("failed processing sptlrpc log: %d\n", rc);
 241         }
 242
 243         return cld;
 244 }
 245
 246 static struct config_llog_data *config_recover_log_add(struct obd_device *obd,
 247         char *fsname,
 248         struct config_llog_instance *cfg,
 249         struct super_block *sb)
 250 {
 251         struct config_llog_instance lcfg = *cfg;
 252         struct lustre_sb_info *lsi = s2lsi(sb);
 253         struct config_llog_data *cld;
 254         char logname[32];
 255
 256         if (IS_OST(lsi))
 257                 return NULL;
 258
 259         /* for osp-on-ost, see lustre_start_osp() */
 260         if (IS_MDT(lsi) && lcfg.cfg_instance)
 261                 return NULL;
 262
 263         /* we have to use different llog for clients and mdts for cmd
 264          * where only clients are notified if one of cmd server restarts */
 265         LASSERT(strlen(fsname) < sizeof(logname) / 2);
 266         strcpy(logname, fsname);
 267         if (IS_SERVER(lsi)) { /* mdt */
 268                 LASSERT(lcfg.cfg_instance == NULL);
 269                 lcfg.cfg_instance = sb;
 270                 strcat(logname, "-mdtir");
 271         } else {
 272                 LASSERT(lcfg.cfg_instance != NULL);
 273                 strcat(logname, "-cliir");
 274         }
 275
 276         cld = do_config_log_add(obd, logname, CONFIG_T_RECOVER, &lcfg, sb);
 277         return cld;
 278 }
 279
 280 static struct config_llog_data *config_params_log_add(struct obd_device *obd,
 281         struct config_llog_instance *cfg, struct super_block *sb)
 282 {
 283         struct config_llog_instance     lcfg = *cfg;
 284         struct config_llog_data         *cld;
 285
 286         lcfg.cfg_instance = sb;
 287
 288         cld = do_config_log_add(obd, PARAMS_FILENAME, CONFIG_T_PARAMS,
 289                                 &lcfg, sb);
 290
 291         return cld;
 292 }
 293
 294 /** Add this log to the list of active logs watched by an MGC.
 295  * Active means we're watching for updates.
 296  * We have one active log per "mount" - client instance or servername.
 297  * Each instance may be at a different point in the log.
 298  */
 299 static int config_log_add(struct obd_device *obd, char *logname,
 300                           struct config_llog_instance *cfg,
 301                           struct super_block *sb)
 302 {
 303         struct lustre_sb_info *lsi = s2lsi(sb);
 304         struct config_llog_data *cld;
 305         struct config_llog_data *sptlrpc_cld;
 306         struct config_llog_data *params_cld;
 307         char                    seclogname[32];
 308         char                    *ptr;
 309         int                     rc;
 310
 311         CDEBUG(D_MGC, "adding config log %s:%p\n", logname, cfg->cfg_instance);
 312
 313         /*
 314          * for each regular log, the depended sptlrpc log name is
 315          * <fsname>-sptlrpc. multiple regular logs may share one sptlrpc log.
 316          */
 317         ptr = strrchr(logname, '-');
 318         if (ptr == NULL || ptr - logname > 8) {
 319                 CERROR("logname %s is too long\n", logname);
 320                 return -EINVAL;
 321         }
 322
 323         memcpy(seclogname, logname, ptr - logname);
 324         strcpy(seclogname + (ptr - logname), "-sptlrpc");
 325
 326         sptlrpc_cld = config_log_find(seclogname, NULL);
 327         if (sptlrpc_cld == NULL) {
 328                 sptlrpc_cld = do_config_log_add(obd, seclogname,
 329                                                 CONFIG_T_SPTLRPC, NULL, NULL);
 330                 if (IS_ERR(sptlrpc_cld)) {
 331                         CERROR("can't create sptlrpc log: %s\n", seclogname);
 332                         GOTO(out_err, rc = PTR_ERR(sptlrpc_cld));
 333                 }
 334         }
 335         params_cld = config_params_log_add(obd, cfg, sb);
 336         if (IS_ERR(params_cld)) {
 337                 rc = PTR_ERR(params_cld);
 338                 CERROR("%s: can't create params log: rc = %d\n",
 339                        obd->obd_name, rc);
 340                 GOTO(out_err1, rc);
 341         }
 342
 343         cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb);
 344         if (IS_ERR(cld)) {
 345                 CERROR("can't create log: %s\n", logname);
 346                 GOTO(out_err2, rc = PTR_ERR(cld));
 347         }
 348
 349         cld->cld_sptlrpc = sptlrpc_cld;
 350         cld->cld_params = params_cld;
 351
 352         LASSERT(lsi->lsi_lmd);
 353         if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR)) {
 354                 struct config_llog_data *recover_cld;
 355                 *strrchr(seclogname, '-') = 0;
 356                 recover_cld = config_recover_log_add(obd, seclogname, cfg, sb);
 357                 if (IS_ERR(recover_cld))
 358                         GOTO(out_err3, rc = PTR_ERR(recover_cld));
 359                 cld->cld_recover = recover_cld;
 360         }
 361
 362         return 0;
 363
 364 out_err3:
 365         config_log_put(cld);
 366
 367 out_err2:
 368         config_log_put(params_cld);
 369
 370 out_err1:
 371         config_log_put(sptlrpc_cld);
 372
 373 out_err:
 374         return rc;
 375 }
 376
 377 DEFINE_MUTEX(llog_process_lock);
 378
 379 /** Stop watching for updates on this log.
 380  */
 381 static int config_log_end(char *logname, struct config_llog_instance *cfg)
 382 {
 383         struct config_llog_data *cld;
 384         struct config_llog_data *cld_sptlrpc = NULL;
 385         struct config_llog_data *cld_params = NULL;
 386         struct config_llog_data *cld_recover = NULL;
 387         int rc = 0;
 388
 389         cld = config_log_find(logname, cfg);
 390         if (cld == NULL)
 391                 return -ENOENT;
 392
 393         mutex_lock(&cld->cld_lock);
 394         /*
 395          * if cld_stopping is set, it means we didn't start the log thus
 396          * not owning the start ref. this can happen after previous umount:
 397          * the cld still hanging there waiting for lock cancel, and we
 398          * remount again but failed in the middle and call log_end without
 399          * calling start_log.
 400          */
 401         if (unlikely(cld->cld_stopping)) {
 402                 mutex_unlock(&cld->cld_lock);
 403                 /* drop the ref from the find */
 404                 config_log_put(cld);
 405                 return rc;
 406         }
 407
 408         cld->cld_stopping = 1;
 409
 410         cld_recover = cld->cld_recover;
 411         cld->cld_recover = NULL;
 412         mutex_unlock(&cld->cld_lock);
 413
 414         if (cld_recover) {
 415                 mutex_lock(&cld_recover->cld_lock);
 416                 cld_recover->cld_stopping = 1;
 417                 mutex_unlock(&cld_recover->cld_lock);
 418                 config_log_put(cld_recover);
 419         }
 420
 421         spin_lock(&config_list_lock);
 422         cld_sptlrpc = cld->cld_sptlrpc;
 423         cld->cld_sptlrpc = NULL;
 424         cld_params = cld->cld_params;
 425         cld->cld_params = NULL;
 426         spin_unlock(&config_list_lock);
 427
 428         if (cld_sptlrpc)
 429                 config_log_put(cld_sptlrpc);
 430
 431         if (cld_params) {
 432                 mutex_lock(&cld_params->cld_lock);
 433                 cld_params->cld_stopping = 1;
 434                 mutex_unlock(&cld_params->cld_lock);
 435                 config_log_put(cld_params);
 436         }
 437
 438         /* drop the ref from the find */
 439         config_log_put(cld);
 440         /* drop the start ref */
 441         config_log_put(cld);
 442
 443         CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
 444                rc);
 445         return rc;
 446 }
 447
 448 #ifdef LPROCFS
 449 int lprocfs_mgc_rd_ir_state(struct seq_file *m, void *data)
 450 {
 451         struct obd_device       *obd = data;
 452         struct obd_import       *imp = obd->u.cli.cl_import;
 453         struct obd_connect_data *ocd = &imp->imp_connect_data;
 454         struct config_llog_data *cld;
 455
 456         seq_printf(m, "imperative_recovery: %s\n",
 457                       OCD_HAS_FLAG(ocd, IMP_RECOV) ? "ENABLED" : "DISABLED");
 458         seq_printf(m, "client_state:\n");
 459
 460         spin_lock(&config_list_lock);
 461         list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 462                 if (cld->cld_recover == NULL)
 463                         continue;
 464                 seq_printf(m,  "    - { client: %s, nidtbl_version: %u }\n",
 465                                cld->cld_logname,
 466                                cld->cld_recover->cld_cfg.cfg_last_idx);
 467         }
 468         spin_unlock(&config_list_lock);
 469
 470         return 0;
 471 }
 472 #endif
 473
 474 /* reenqueue any lost locks */
 475 #define RQ_RUNNING 0x1
 476 #define RQ_NOW     0x2
 477 #define RQ_LATER   0x4
 478 #define RQ_STOP    0x8
 479 static int                  rq_state = 0;
 480 static wait_queue_head_t            rq_waitq;
 481 static DECLARE_COMPLETION(rq_exit);
 482
 483 static void do_requeue(struct config_llog_data *cld)
 484 {
 485         LASSERT(atomic_read(&cld->cld_refcount) > 0);
 486
 487         /* Do not run mgc_process_log on a disconnected export or an
 488            export which is being disconnected. Take the client
 489            semaphore to make the check non-racy. */
 490         down_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
 491         if (cld->cld_mgcexp->exp_obd->u.cli.cl_conn_count != 0) {
 492                 CDEBUG(D_MGC, "updating log %s\n", cld->cld_logname);
 493                 mgc_process_log(cld->cld_mgcexp->exp_obd, cld);
 494         } else {
 495                 CDEBUG(D_MGC, "disconnecting, won't update log %s\n",
 496                        cld->cld_logname);
 497         }
 498         up_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
 499 }
 500
 501 /* this timeout represents how many seconds MGC should wait before
 502  * requeue config and recover lock to the MGS. We need to randomize this
 503  * in order to not flood the MGS.
 504  */
 505 #define MGC_TIMEOUT_MIN_SECONDS   5
 506 #define MGC_TIMEOUT_RAND_CENTISEC 0x1ff /* ~500 */
 507
 508 static int mgc_requeue_thread(void *data)
 509 {
 510         int rc = 0;
 511
 512         CDEBUG(D_MGC, "Starting requeue thread\n");
 513
 514         /* Keep trying failed locks periodically */
 515         spin_lock(&config_list_lock);
 516         rq_state |= RQ_RUNNING;
 517         while (1) {
 518                 struct l_wait_info lwi;
 519                 struct config_llog_data *cld, *cld_prev;
 520                 int rand = cfs_rand() & MGC_TIMEOUT_RAND_CENTISEC;
 521                 int stopped = !!(rq_state & RQ_STOP);
 522                 int to;
 523
 524                 /* Any new or requeued lostlocks will change the state */
 525                 rq_state &= ~(RQ_NOW | RQ_LATER);
 526                 spin_unlock(&config_list_lock);
 527
 528                 /* Always wait a few seconds to allow the server who
 529                    caused the lock revocation to finish its setup, plus some
 530                    random so everyone doesn't try to reconnect at once. */
 531                 to = MGC_TIMEOUT_MIN_SECONDS * HZ;
 532                 to += rand * HZ / 100; /* rand is centi-seconds */
 533                 lwi = LWI_TIMEOUT(to, NULL, NULL);
 534                 l_wait_event(rq_waitq, rq_state & RQ_STOP, &lwi);
 535
 536                 /*
 537                  * iterate & processing through the list. for each cld, process
 538                  * its depending sptlrpc cld firstly (if any) and then itself.
 539                  *
 540                  * it's guaranteed any item in the list must have
 541                  * reference > 0; and if cld_lostlock is set, at
 542                  * least one reference is taken by the previous enqueue.
 543                  */
 544                 cld_prev = NULL;
 545
 546                 spin_lock(&config_list_lock);
 547                 list_for_each_entry(cld, &config_llog_list,
 548                                         cld_list_chain) {
 549                         if (!cld->cld_lostlock)
 550                                 continue;
 551
 552                         spin_unlock(&config_list_lock);
 553
 554                         LASSERT(atomic_read(&cld->cld_refcount) > 0);
 555
 556                         /* Whether we enqueued again or not in mgc_process_log,
 557                          * we're done with the ref from the old enqueue */
 558                         if (cld_prev)
 559                                 config_log_put(cld_prev);
 560                         cld_prev = cld;
 561
 562                         cld->cld_lostlock = 0;
 563                         if (likely(!stopped))
 564                                 do_requeue(cld);
 565
 566                         spin_lock(&config_list_lock);
 567                 }
 568                 spin_unlock(&config_list_lock);
 569                 if (cld_prev)
 570                         config_log_put(cld_prev);
 571
 572                 /* break after scanning the list so that we can drop
 573                  * refcount to losing lock clds */
 574                 if (unlikely(stopped)) {
 575                         spin_lock(&config_list_lock);
 576                         break;
 577                 }
 578
 579                 /* Wait a bit to see if anyone else needs a requeue */
 580                 lwi = (struct l_wait_info) { 0 };
 581                 l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP),
 582                              &lwi);
 583                 spin_lock(&config_list_lock);
 584         }
 585         /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
 586         rq_state &= ~RQ_RUNNING;
 587         spin_unlock(&config_list_lock);
 588
 589         complete(&rq_exit);
 590
 591         CDEBUG(D_MGC, "Ending requeue thread\n");
 592         return rc;
 593 }
 594
 595 /* Add a cld to the list to requeue.  Start the requeue thread if needed.
 596    We are responsible for dropping the config log reference from here on out. */
 597 static void mgc_requeue_add(struct config_llog_data *cld)
 598 {
 599         CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n",
 600                cld->cld_logname, atomic_read(&cld->cld_refcount),
 601                cld->cld_stopping, rq_state);
 602         LASSERT(atomic_read(&cld->cld_refcount) > 0);
 603
 604         mutex_lock(&cld->cld_lock);
 605         if (cld->cld_stopping || cld->cld_lostlock) {
 606                 mutex_unlock(&cld->cld_lock);
 607                 return;
 608         }
 609         /* this refcount will be released in mgc_requeue_thread. */
 610         config_log_get(cld);
 611         cld->cld_lostlock = 1;
 612         mutex_unlock(&cld->cld_lock);
 613
 614         /* Hold lock for rq_state */
 615         spin_lock(&config_list_lock);
 616         if (rq_state & RQ_STOP) {
 617                 spin_unlock(&config_list_lock);
 618                 cld->cld_lostlock = 0;
 619                 config_log_put(cld);
 620         } else {
 621                 rq_state |= RQ_NOW;
 622                 spin_unlock(&config_list_lock);
 623                 wake_up(&rq_waitq);
 624         }
 625 }
 626
 627 /********************** class fns **********************/
 628 static int mgc_local_llog_init(const struct lu_env *env,
 629                                struct obd_device *obd,
 630                                struct obd_device *disk)
 631 {
 632         struct llog_ctxt        *ctxt;
 633         int                      rc;
 634
 635         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_ORIG_CTXT, disk,
 636                         &llog_osd_ops);
 637         if (rc)
 638                 return rc;
 639
 640         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
 641         LASSERT(ctxt);
 642         ctxt->loc_dir = obd->u.cli.cl_mgc_configs_dir;
 643         llog_ctxt_put(ctxt);
 644
 645         return 0;
 646 }
 647
 648 static int mgc_local_llog_fini(const struct lu_env *env,
 649                                struct obd_device *obd)
 650 {
 651         struct llog_ctxt *ctxt;
 652
 653         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
 654         llog_cleanup(env, ctxt);
 655
 656         return 0;
 657 }
 658
 659 static int mgc_fs_setup(struct obd_device *obd, struct super_block *sb)
 660 {
 661         struct lustre_sb_info   *lsi = s2lsi(sb);
 662         struct client_obd       *cli = &obd->u.cli;
 663         struct lu_fid            rfid, fid;
 664         struct dt_object        *root, *dto;
 665         struct lu_env           *env;
 666         int                      rc = 0;
 667
 668         LASSERT(lsi);
 669         LASSERT(lsi->lsi_dt_dev);
 670
 671         OBD_ALLOC_PTR(env);
 672         if (env == NULL)
 673                 return -ENOMEM;
 674
 675         /* The mgc fs exclusion mutex. Only one fs can be setup at a time. */
 676         mutex_lock(&cli->cl_mgc_mutex);
 677
 678         cfs_cleanup_group_info();
 679
 680         /* Setup the configs dir */
 681         rc = lu_env_init(env, LCT_MG_THREAD);
 682         if (rc)
 683                 GOTO(out_err, rc);
 684
 685         fid.f_seq = FID_SEQ_LOCAL_NAME;
 686         fid.f_oid = 1;
 687         fid.f_ver = 0;
 688         rc = local_oid_storage_init(env, lsi->lsi_dt_dev, &fid,
 689                                     &cli->cl_mgc_los);
 690         if (rc)
 691                 GOTO(out_env, rc);
 692
 693         rc = dt_root_get(env, lsi->lsi_dt_dev, &rfid);
 694         if (rc)
 695                 GOTO(out_env, rc);
 696
 697         root = dt_locate_at(env, lsi->lsi_dt_dev, &rfid,
 698                             &cli->cl_mgc_los->los_dev->dd_lu_dev);
 699         if (unlikely(IS_ERR(root)))
 700                 GOTO(out_los, rc = PTR_ERR(root));
 701
 702         dto = local_file_find_or_create(env, cli->cl_mgc_los, root,
 703                                         MOUNT_CONFIGS_DIR,
 704                                         S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
 705         lu_object_put_nocache(env, &root->do_lu);
 706         if (IS_ERR(dto))
 707                 GOTO(out_los, rc = PTR_ERR(dto));
 708
 709         cli->cl_mgc_configs_dir = dto;
 710
 711         LASSERT(lsi->lsi_osd_exp->exp_obd->obd_lvfs_ctxt.dt);
 712         rc = mgc_local_llog_init(env, obd, lsi->lsi_osd_exp->exp_obd);
 713         if (rc)
 714                 GOTO(out_llog, rc);
 715
 716         /* We take an obd ref to insure that we can't get to mgc_cleanup
 717          * without calling mgc_fs_cleanup first. */
 718         class_incref(obd, "mgc_fs", obd);
 719
 720         /* We keep the cl_mgc_sem until mgc_fs_cleanup */
 721 out_llog:
 722         if (rc) {
 723                 lu_object_put(env, &cli->cl_mgc_configs_dir->do_lu);
 724                 cli->cl_mgc_configs_dir = NULL;
 725         }
 726 out_los:
 727         if (rc < 0) {
 728                 local_oid_storage_fini(env, cli->cl_mgc_los);
 729                 cli->cl_mgc_los = NULL;
 730                 mutex_unlock(&cli->cl_mgc_mutex);
 731         }
 732 out_env:
 733         lu_env_fini(env);
 734 out_err:
 735         OBD_FREE_PTR(env);
 736         return rc;
 737 }
 738
 739 static int mgc_fs_cleanup(struct obd_device *obd)
 740 {
 741         struct lu_env            env;
 742         struct client_obd       *cli = &obd->u.cli;
 743         int                      rc;
 744
 745         LASSERT(cli->cl_mgc_los != NULL);
 746
 747         rc = lu_env_init(&env, LCT_MG_THREAD);
 748         if (rc)
 749                 GOTO(unlock, rc);
 750
 751         mgc_local_llog_fini(&env, obd);
 752
 753         lu_object_put_nocache(&env, &cli->cl_mgc_configs_dir->do_lu);
 754         cli->cl_mgc_configs_dir = NULL;
 755
 756         local_oid_storage_fini(&env, cli->cl_mgc_los);
 757         cli->cl_mgc_los = NULL;
 758         lu_env_fini(&env);
 759
 760 unlock:
 761         class_decref(obd, "mgc_fs", obd);
 762         mutex_unlock(&cli->cl_mgc_mutex);
 763
 764         return 0;
 765 }
 766
 767 static int mgc_llog_init(const struct lu_env *env, struct obd_device *obd)
 768 {
 769         struct llog_ctxt        *ctxt;
 770         int                      rc;
 771
 772         /* setup only remote ctxt, the local disk context is switched per each
 773          * filesystem during mgc_fs_setup() */
 774         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_REPL_CTXT, obd,
 775                         &llog_client_ops);
 776         if (rc)
 777                 return rc;
 778
 779         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 780         LASSERT(ctxt);
 781
 782         llog_initiator_connect(ctxt);
 783         llog_ctxt_put(ctxt);
 784
 785         return 0;
 786 }
 787
 788 static int mgc_llog_fini(const struct lu_env *env, struct obd_device *obd)
 789 {
 790         struct llog_ctxt *ctxt;
 791
 792         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 793         if (ctxt)
 794                 llog_cleanup(env, ctxt);
 795
 796         return 0;
 797 }
 798
 799 static atomic_t mgc_count = ATOMIC_INIT(0);
 800 static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
 801 {
 802         int rc = 0;
 803
 804         switch (stage) {
 805         case OBD_CLEANUP_EARLY:
 806                 break;
 807         case OBD_CLEANUP_EXPORTS:
 808                 if (atomic_dec_and_test(&mgc_count)) {
 809                         int running;
 810                         /* stop requeue thread */
 811                         spin_lock(&config_list_lock);
 812                         running = rq_state & RQ_RUNNING;
 813                         if (running)
 814                                 rq_state |= RQ_STOP;
 815                         spin_unlock(&config_list_lock);
 816                         if (running) {
 817                                 wake_up(&rq_waitq);
 818                                 wait_for_completion(&rq_exit);
 819                         }
 820                 }
 821                 obd_cleanup_client_import(obd);
 822                 rc = mgc_llog_fini(NULL, obd);
 823                 if (rc != 0)
 824                         CERROR("failed to cleanup llogging subsystems\n");
 825                 break;
 826         }
 827         return rc;
 828 }
 829
 830 static int mgc_cleanup(struct obd_device *obd)
 831 {
 832         int rc;
 833
 834         /* COMPAT_146 - old config logs may have added profiles we don't
 835            know about */
 836         if (obd->obd_type->typ_refcnt <= 1)
 837                 /* Only for the last mgc */
 838                 class_del_profiles();
 839
 840         lprocfs_obd_cleanup(obd);
 841         ptlrpcd_decref();
 842
 843         rc = client_obd_cleanup(obd);
 844         return rc;
 845 }
 846
 847 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 848 {
 849         struct lprocfs_static_vars lvars;
 850         int rc;
 851
 852         ptlrpcd_addref();
 853
 854         rc = client_obd_setup(obd, lcfg);
 855         if (rc)
 856                 GOTO(err_decref, rc);
 857
 858         rc = mgc_llog_init(NULL, obd);
 859         if (rc) {
 860                 CERROR("failed to setup llogging subsystems\n");
 861                 GOTO(err_cleanup, rc);
 862         }
 863
 864         lprocfs_mgc_init_vars(&lvars);
 865         lprocfs_obd_setup(obd, lvars.obd_vars);
 866         sptlrpc_lprocfs_cliobd_attach(obd);
 867
 868         if (atomic_inc_return(&mgc_count) == 1) {
 869                 rq_state = 0;
 870                 init_waitqueue_head(&rq_waitq);
 871
 872                 /* start requeue thread */
 873                 rc = PTR_ERR(kthread_run(mgc_requeue_thread, NULL,
 874                                              "ll_cfg_requeue"));
 875                 if (IS_ERR_VALUE(rc)) {
 876                         CERROR("%s: Cannot start requeue thread (%d),"
 877                                "no more log updates!\n",
 878                                obd->obd_name, rc);
 879                         GOTO(err_cleanup, rc);
 880                 }
 881                 /* rc is the task_struct pointer of mgc_requeue_thread. */
 882                 rc = 0;
 883         }
 884
 885         return rc;
 886
 887 err_cleanup:
 888         client_obd_cleanup(obd);
 889 err_decref:
 890         ptlrpcd_decref();
 891         return rc;
 892 }
 893
 894 /* based on ll_mdc_blocking_ast */
 895 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 896                             void *data, int flag)
 897 {
 898         struct lustre_handle lockh;
 899         struct config_llog_data *cld = (struct config_llog_data *)data;
 900         int rc = 0;
 901
 902         switch (flag) {
 903         case LDLM_CB_BLOCKING:
 904                 /* mgs wants the lock, give it up... */
 905                 LDLM_DEBUG(lock, "MGC blocking CB");
 906                 ldlm_lock2handle(lock, &lockh);
 907                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
 908                 break;
 909         case LDLM_CB_CANCELING:
 910                 /* We've given up the lock, prepare ourselves to update. */
 911                 LDLM_DEBUG(lock, "MGC cancel CB");
 912
 913                 CDEBUG(D_MGC, "Lock res "DLDLMRES" (%.8s)\n",
 914                        PLDLMRES(lock->l_resource),
 915                        (char *)&lock->l_resource->lr_name.name[0]);
 916
 917                 if (!cld) {
 918                         CDEBUG(D_INFO, "missing data, won't requeue\n");
 919                         break;
 920                 }
 921
 922                 /* held at mgc_process_log(). */
 923                 LASSERT(atomic_read(&cld->cld_refcount) > 0);
 924                 /* Are we done with this log? */
 925                 if (cld->cld_stopping) {
 926                         CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
 927                                cld->cld_logname);
 928                         config_log_put(cld);
 929                         break;
 930                 }
 931                 /* Make sure not to re-enqueue when the mgc is stopping
 932                    (we get called from client_disconnect_export) */
 933                 if (!lock->l_conn_export ||
 934                     !lock->l_conn_export->exp_obd->u.cli.cl_conn_count) {
 935                         CDEBUG(D_MGC, "log %.8s: disconnecting, won't requeue\n",
 936                                cld->cld_logname);
 937                         config_log_put(cld);
 938                         break;
 939                 }
 940
 941                 /* Re-enqueue now */
 942                 mgc_requeue_add(cld);
 943                 config_log_put(cld);
 944                 break;
 945         default:
 946                 LBUG();
 947         }
 948
 949         return rc;
 950 }
 951
 952 /* Not sure where this should go... */
 953 /* This is the timeout value for MGS_CONNECT request plus a ping interval, such
 954  * that we can have a chance to try the secondary MGS if any. */
 955 #define  MGC_ENQUEUE_LIMIT (INITIAL_CONNECT_TIMEOUT + (AT_OFF ? 0 : at_min) \
 956                                 + PING_INTERVAL)
 957 #define  MGC_TARGET_REG_LIMIT 10
 958 #define  MGC_SEND_PARAM_LIMIT 10
 959
 960 /* Send parameter to MGS*/
 961 static int mgc_set_mgs_param(struct obd_export *exp,
 962                              struct mgs_send_param *msp)
 963 {
 964         struct ptlrpc_request *req;
 965         struct mgs_send_param *req_msp, *rep_msp;
 966         int rc;
 967
 968         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
 969                                         &RQF_MGS_SET_INFO, LUSTRE_MGS_VERSION,
 970                                         MGS_SET_INFO);
 971         if (!req)
 972                 return -ENOMEM;
 973
 974         req_msp = req_capsule_client_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
 975         if (!req_msp) {
 976                 ptlrpc_req_finished(req);
 977                 return -ENOMEM;
 978         }
 979
 980         memcpy(req_msp, msp, sizeof(*req_msp));
 981         ptlrpc_request_set_replen(req);
 982
 983         /* Limit how long we will wait for the enqueue to complete */
 984         req->rq_delay_limit = MGC_SEND_PARAM_LIMIT;
 985         rc = ptlrpc_queue_wait(req);
 986         if (!rc) {
 987                 rep_msp = req_capsule_server_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
 988                 memcpy(msp, rep_msp, sizeof(*rep_msp));
 989         }
 990
 991         ptlrpc_req_finished(req);
 992
 993         return rc;
 994 }
 995
 996 /* Take a config lock so we can get cancel notifications */
 997 static int mgc_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm,
 998                        __u32 type, ldlm_policy_data_t *policy, __u32 mode,
 999                        __u64 *flags, void *bl_cb, void *cp_cb, void *gl_cb,
1000                        void *data, __u32 lvb_len, void *lvb_swabber,
1001                        struct lustre_handle *lockh)
1002 {
1003         struct config_llog_data *cld = (struct config_llog_data *)data;
1004         struct ldlm_enqueue_info einfo = {
1005                 .ei_type        = type,
1006                 .ei_mode        = mode,
1007                 .ei_cb_bl       = mgc_blocking_ast,
1008                 .ei_cb_cp       = ldlm_completion_ast,
1009         };
1010         struct ptlrpc_request *req;
1011         int short_limit = cld_is_sptlrpc(cld);
1012         int rc;
1013
1014         CDEBUG(D_MGC, "Enqueue for %s (res "LPX64")\n", cld->cld_logname,
1015                cld->cld_resid.name[0]);
1016
1017         /* We need a callback for every lockholder, so don't try to
1018            ldlm_lock_match (see rev 1.1.2.11.2.47) */
1019         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1020                                         &RQF_LDLM_ENQUEUE, LUSTRE_DLM_VERSION,
1021                                         LDLM_ENQUEUE);
1022         if (req == NULL)
1023                 return -ENOMEM;
1024
1025         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, 0);
1026         ptlrpc_request_set_replen(req);
1027
1028         /* check if this is server or client */
1029         if (cld->cld_cfg.cfg_sb) {
1030                 struct lustre_sb_info *lsi = s2lsi(cld->cld_cfg.cfg_sb);
1031                 if (lsi && IS_SERVER(lsi))
1032                         short_limit = 1;
1033         }
1034         /* Limit how long we will wait for the enqueue to complete */
1035         req->rq_delay_limit = short_limit ? 5 : MGC_ENQUEUE_LIMIT;
1036         rc = ldlm_cli_enqueue(exp, &req, &einfo, &cld->cld_resid, NULL, flags,
1037                               NULL, 0, LVB_T_NONE, lockh, 0);
1038         /* A failed enqueue should still call the mgc_blocking_ast,
1039            where it will be requeued if needed ("grant failed"). */
1040         ptlrpc_req_finished(req);
1041         return rc;
1042 }
1043
1044 static int mgc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
1045                       __u32 mode, struct lustre_handle *lockh)
1046 {
1047         ldlm_lock_decref(lockh, mode);
1048
1049         return 0;
1050 }
1051
1052 static void mgc_notify_active(struct obd_device *unused)
1053 {
1054         /* wakeup mgc_requeue_thread to requeue mgc lock */
1055         spin_lock(&config_list_lock);
1056         rq_state |= RQ_NOW;
1057         spin_unlock(&config_list_lock);
1058         wake_up(&rq_waitq);
1059
1060         /* TODO: Help the MGS rebuild nidtbl. -jay */
1061 }
1062
1063 /* Send target_reg message to MGS */
1064 static int mgc_target_register(struct obd_export *exp,
1065                                struct mgs_target_info *mti)
1066 {
1067         struct ptlrpc_request  *req;
1068         struct mgs_target_info *req_mti, *rep_mti;
1069         int                  rc;
1070
1071         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1072                                         &RQF_MGS_TARGET_REG, LUSTRE_MGS_VERSION,
1073                                         MGS_TARGET_REG);
1074         if (req == NULL)
1075                 return -ENOMEM;
1076
1077         req_mti = req_capsule_client_get(&req->rq_pill, &RMF_MGS_TARGET_INFO);
1078         if (!req_mti) {
1079                 ptlrpc_req_finished(req);
1080                 return -ENOMEM;
1081         }
1082
1083         memcpy(req_mti, mti, sizeof(*req_mti));
1084         ptlrpc_request_set_replen(req);
1085         CDEBUG(D_MGC, "register %s\n", mti->mti_svname);
1086         /* Limit how long we will wait for the enqueue to complete */
1087         req->rq_delay_limit = MGC_TARGET_REG_LIMIT;
1088
1089         rc = ptlrpc_queue_wait(req);
1090         if (!rc) {
1091                 rep_mti = req_capsule_server_get(&req->rq_pill,
1092                                                  &RMF_MGS_TARGET_INFO);
1093                 memcpy(mti, rep_mti, sizeof(*rep_mti));
1094                 CDEBUG(D_MGC, "register %s got index = %d\n",
1095                        mti->mti_svname, mti->mti_stripe_index);
1096         }
1097         ptlrpc_req_finished(req);
1098
1099         return rc;
1100 }
1101
1102 int mgc_set_info_async(const struct lu_env *env, struct obd_export *exp,
1103                        obd_count keylen, void *key, obd_count vallen,
1104                        void *val, struct ptlrpc_request_set *set)
1105 {
1106         int rc = -EINVAL;
1107
1108         /* Turn off initial_recov after we try all backup servers once */
1109         if (KEY_IS(KEY_INIT_RECOV_BACKUP)) {
1110                 struct obd_import *imp = class_exp2cliimp(exp);
1111                 int value;
1112                 if (vallen != sizeof(int))
1113                         return -EINVAL;
1114                 value = *(int *)val;
1115                 CDEBUG(D_MGC, "InitRecov %s %d/d%d:i%d:r%d:or%d:%s\n",
1116                        imp->imp_obd->obd_name, value,
1117                        imp->imp_deactive, imp->imp_invalid,
1118                        imp->imp_replayable, imp->imp_obd->obd_replayable,
1119                        ptlrpc_import_state_name(imp->imp_state));
1120                 /* Resurrect if we previously died */
1121                 if ((imp->imp_state != LUSTRE_IMP_FULL &&
1122                      imp->imp_state != LUSTRE_IMP_NEW) || value > 1)
1123                         ptlrpc_reconnect_import(imp);
1124                 return 0;
1125         }
1126         /* FIXME move this to mgc_process_config */
1127         if (KEY_IS(KEY_REGISTER_TARGET)) {
1128                 struct mgs_target_info *mti;
1129                 if (vallen != sizeof(struct mgs_target_info))
1130                         return -EINVAL;
1131                 mti = (struct mgs_target_info *)val;
1132                 CDEBUG(D_MGC, "register_target %s %#x\n",
1133                        mti->mti_svname, mti->mti_flags);
1134                 rc =  mgc_target_register(exp, mti);
1135                 return rc;
1136         }
1137         if (KEY_IS(KEY_SET_FS)) {
1138                 struct super_block *sb = (struct super_block *)val;
1139
1140                 if (vallen != sizeof(struct super_block))
1141                         return -EINVAL;
1142
1143                 rc = mgc_fs_setup(exp->exp_obd, sb);
1144                 if (rc)
1145                         CERROR("set_fs got %d\n", rc);
1146
1147                 return rc;
1148         }
1149         if (KEY_IS(KEY_CLEAR_FS)) {
1150                 if (vallen != 0)
1151                         return -EINVAL;
1152                 rc = mgc_fs_cleanup(exp->exp_obd);
1153                 if (rc)
1154                         CERROR("clear_fs got %d\n", rc);
1155
1156                 return rc;
1157         }
1158         if (KEY_IS(KEY_SET_INFO)) {
1159                 struct mgs_send_param *msp;
1160
1161                 msp = (struct mgs_send_param *)val;
1162                 rc =  mgc_set_mgs_param(exp, msp);
1163                 return rc;
1164         }
1165         if (KEY_IS(KEY_MGSSEC)) {
1166                 struct client_obd     *cli = &exp->exp_obd->u.cli;
1167                 struct sptlrpc_flavor  flvr;
1168
1169                 /*
1170                  * empty string means using current flavor, if which haven't
1171                  * been set yet, set it as null.
1172                  *
1173                  * if flavor has been set previously, check the asking flavor
1174                  * must match the existing one.
1175                  */
1176                 if (vallen == 0) {
1177                         if (cli->cl_flvr_mgc.sf_rpc != SPTLRPC_FLVR_INVALID)
1178                                 return 0;
1179                         val = "null";
1180                         vallen = 4;
1181                 }
1182
1183                 rc = sptlrpc_parse_flavor(val, &flvr);
1184                 if (rc) {
1185                         CERROR("invalid sptlrpc flavor %s to MGS\n",
1186                                (char *) val);
1187                         return rc;
1188                 }
1189
1190                 /*
1191                  * caller already hold a mutex
1192                  */
1193                 if (cli->cl_flvr_mgc.sf_rpc == SPTLRPC_FLVR_INVALID) {
1194                         cli->cl_flvr_mgc = flvr;
1195                 } else if (memcmp(&cli->cl_flvr_mgc, &flvr,
1196                                   sizeof(flvr)) != 0) {
1197                         char    str[20];
1198
1199                         sptlrpc_flavor2name(&cli->cl_flvr_mgc,
1200                                             str, sizeof(str));
1201                         LCONSOLE_ERROR("asking sptlrpc flavor %s to MGS but "
1202                                        "currently %s is in use\n",
1203                                        (char *) val, str);
1204                         rc = -EPERM;
1205                 }
1206                 return rc;
1207         }
1208
1209         return rc;
1210 }
1211
1212 static int mgc_get_info(const struct lu_env *env, struct obd_export *exp,
1213                         __u32 keylen, void *key, __u32 *vallen, void *val,
1214                         struct lov_stripe_md *unused)
1215 {
1216         int rc = -EINVAL;
1217
1218         if (KEY_IS(KEY_CONN_DATA)) {
1219                 struct obd_import *imp = class_exp2cliimp(exp);
1220                 struct obd_connect_data *data = val;
1221
1222                 if (*vallen == sizeof(*data)) {
1223                         *data = imp->imp_connect_data;
1224                         rc = 0;
1225                 }
1226         }
1227
1228         return rc;
1229 }
1230
1231 static int mgc_import_event(struct obd_device *obd,
1232                             struct obd_import *imp,
1233                             enum obd_import_event event)
1234 {
1235         int rc = 0;
1236
1237         LASSERT(imp->imp_obd == obd);
1238         CDEBUG(D_MGC, "import event %#x\n", event);
1239
1240         switch (event) {
1241         case IMP_EVENT_DISCON:
1242                 /* MGC imports should not wait for recovery */
1243                 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1244                         ptlrpc_pinger_ir_down();
1245                 break;
1246         case IMP_EVENT_INACTIVE:
1247                 break;
1248         case IMP_EVENT_INVALIDATE: {
1249                 struct ldlm_namespace *ns = obd->obd_namespace;
1250                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
1251                 break;
1252         }
1253         case IMP_EVENT_ACTIVE:
1254                 CDEBUG(D_INFO, "%s: Reactivating import\n", obd->obd_name);
1255                 /* Clearing obd_no_recov allows us to continue pinging */
1256                 obd->obd_no_recov = 0;
1257                 mgc_notify_active(obd);
1258                 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1259                         ptlrpc_pinger_ir_up();
1260                 break;
1261         case IMP_EVENT_OCD:
1262                 break;
1263         case IMP_EVENT_DEACTIVATE:
1264         case IMP_EVENT_ACTIVATE:
1265                 break;
1266         default:
1267                 CERROR("Unknown import event %#x\n", event);
1268                 LBUG();
1269         }
1270         return rc;
1271 }
1272
1273 enum {
1274         CONFIG_READ_NRPAGES_INIT = 1 << (20 - PAGE_CACHE_SHIFT),
1275         CONFIG_READ_NRPAGES      = 4
1276 };
1277
1278 static int mgc_apply_recover_logs(struct obd_device *mgc,
1279                                   struct config_llog_data *cld,
1280                                   __u64 max_version,
1281                                   void *data, int datalen, bool mne_swab)
1282 {
1283         struct config_llog_instance *cfg = &cld->cld_cfg;
1284         struct lustre_sb_info       *lsi = s2lsi(cfg->cfg_sb);
1285         struct mgs_nidtbl_entry *entry;
1286         struct lustre_cfg       *lcfg;
1287         struct lustre_cfg_bufs   bufs;
1288         u64   prev_version = 0;
1289         char *inst;
1290         char *buf;
1291         int   bufsz;
1292         int   pos;
1293         int   rc  = 0;
1294         int   off = 0;
1295
1296         LASSERT(cfg->cfg_instance != NULL);
1297         LASSERT(cfg->cfg_sb == cfg->cfg_instance);
1298
1299         OBD_ALLOC(inst, PAGE_CACHE_SIZE);
1300         if (inst == NULL)
1301                 return -ENOMEM;
1302
1303         if (!IS_SERVER(lsi)) {
1304                 pos = snprintf(inst, PAGE_CACHE_SIZE, "%p", cfg->cfg_instance);
1305                 if (pos >= PAGE_CACHE_SIZE) {
1306                         OBD_FREE(inst, PAGE_CACHE_SIZE);
1307                         return -E2BIG;
1308                 }
1309         } else {
1310                 LASSERT(IS_MDT(lsi));
1311                 rc = server_name2svname(lsi->lsi_svname, inst, NULL,
1312                                         PAGE_CACHE_SIZE);
1313                 if (rc) {
1314                         OBD_FREE(inst, PAGE_CACHE_SIZE);
1315                         return -EINVAL;
1316                 }
1317                 pos = strlen(inst);
1318         }
1319
1320         ++pos;
1321         buf   = inst + pos;
1322         bufsz = PAGE_CACHE_SIZE - pos;
1323
1324         while (datalen > 0) {
1325                 int   entry_len = sizeof(*entry);
1326                 int   is_ost;
1327                 struct obd_device *obd;
1328                 char *obdname;
1329                 char *cname;
1330                 char *params;
1331                 char *uuid;
1332
1333                 rc = -EINVAL;
1334                 if (datalen < sizeof(*entry))
1335                         break;
1336
1337                 entry = (typeof(entry))(data + off);
1338
1339                 /* sanity check */
1340                 if (entry->mne_nid_type != 0) /* only support type 0 for ipv4 */
1341                         break;
1342                 if (entry->mne_nid_count == 0) /* at least one nid entry */
1343                         break;
1344                 if (entry->mne_nid_size != sizeof(lnet_nid_t))
1345                         break;
1346
1347                 entry_len += entry->mne_nid_count * entry->mne_nid_size;
1348                 if (datalen < entry_len) /* must have entry_len at least */
1349                         break;
1350
1351                 /* Keep this swab for normal mixed endian handling. LU-1644 */
1352                 if (mne_swab)
1353                         lustre_swab_mgs_nidtbl_entry(entry);
1354                 if (entry->mne_length > PAGE_CACHE_SIZE) {
1355                         CERROR("MNE too large (%u)\n", entry->mne_length);
1356                         break;
1357                 }
1358
1359                 if (entry->mne_length < entry_len)
1360                         break;
1361
1362                 off     += entry->mne_length;
1363                 datalen -= entry->mne_length;
1364                 if (datalen < 0)
1365                         break;
1366
1367                 if (entry->mne_version > max_version) {
1368                         CERROR("entry index(%lld) is over max_index(%lld)\n",
1369                                entry->mne_version, max_version);
1370                         break;
1371                 }
1372
1373                 if (prev_version >= entry->mne_version) {
1374                         CERROR("index unsorted, prev %lld, now %lld\n",
1375                                prev_version, entry->mne_version);
1376                         break;
1377                 }
1378                 prev_version = entry->mne_version;
1379
1380                 /*
1381                  * Write a string with format "nid::instance" to
1382                  * lustre/<osc|mdc>/<target>-<osc|mdc>-<instance>/import.
1383                  */
1384
1385                 is_ost = entry->mne_type == LDD_F_SV_TYPE_OST;
1386                 memset(buf, 0, bufsz);
1387                 obdname = buf;
1388                 pos = 0;
1389
1390                 /* lustre-OST0001-osc-<instance #> */
1391                 strcpy(obdname, cld->cld_logname);
1392                 cname = strrchr(obdname, '-');
1393                 if (cname == NULL) {
1394                         CERROR("mgc %s: invalid logname %s\n",
1395                                mgc->obd_name, obdname);
1396                         break;
1397                 }
1398
1399                 pos = cname - obdname;
1400                 obdname[pos] = 0;
1401                 pos += sprintf(obdname + pos, "-%s%04x",
1402                                   is_ost ? "OST" : "MDT", entry->mne_index);
1403
1404                 cname = is_ost ? "osc" : "mdc",
1405                 pos += sprintf(obdname + pos, "-%s-%s", cname, inst);
1406                 lustre_cfg_bufs_reset(&bufs, obdname);
1407
1408                 /* find the obd by obdname */
1409                 obd = class_name2obd(obdname);
1410                 if (obd == NULL) {
1411                         CDEBUG(D_INFO, "mgc %s: cannot find obdname %s\n",
1412                                mgc->obd_name, obdname);
1413                         rc = 0;
1414                         /* this is a safe race, when the ost is starting up...*/
1415                         continue;
1416                 }
1417
1418                 /* osc.import = "connection=<Conn UUID>::<target instance>" */
1419                 ++pos;
1420                 params = buf + pos;
1421                 pos += sprintf(params, "%s.import=%s", cname, "connection=");
1422                 uuid = buf + pos;
1423
1424                 down_read(&obd->u.cli.cl_sem);
1425                 if (obd->u.cli.cl_import == NULL) {
1426                         /* client does not connect to the OST yet */
1427                         up_read(&obd->u.cli.cl_sem);
1428                         rc = 0;
1429                         continue;
1430                 }
1431
1432                 /* TODO: iterate all nids to find one */
1433                 /* find uuid by nid */
1434                 rc = client_import_find_conn(obd->u.cli.cl_import,
1435                                              entry->u.nids[0],
1436                                              (struct obd_uuid *)uuid);
1437                 up_read(&obd->u.cli.cl_sem);
1438                 if (rc < 0) {
1439                         CERROR("mgc: cannot find uuid by nid %s\n",
1440                                libcfs_nid2str(entry->u.nids[0]));
1441                         break;
1442                 }
1443
1444                 CDEBUG(D_INFO, "Find uuid %s by nid %s\n",
1445                        uuid, libcfs_nid2str(entry->u.nids[0]));
1446
1447                 pos += strlen(uuid);
1448                 pos += sprintf(buf + pos, "::%u", entry->mne_instance);
1449                 LASSERT(pos < bufsz);
1450
1451                 lustre_cfg_bufs_set_string(&bufs, 1, params);
1452
1453                 rc = -ENOMEM;
1454                 lcfg = lustre_cfg_new(LCFG_PARAM, &bufs);
1455                 if (lcfg == NULL) {
1456                         CERROR("mgc: cannot allocate memory\n");
1457                         break;
1458                 }
1459
1460                 CDEBUG(D_INFO, "ir apply logs "LPD64"/"LPD64" for %s -> %s\n",
1461                        prev_version, max_version, obdname, params);
1462
1463                 rc = class_process_config(lcfg);
1464                 lustre_cfg_free(lcfg);
1465                 if (rc)
1466                         CDEBUG(D_INFO, "process config for %s error %d\n",
1467                                obdname, rc);
1468
1469                 /* continue, even one with error */
1470         }
1471
1472         OBD_FREE(inst, PAGE_CACHE_SIZE);
1473         return rc;
1474 }
1475
1476 /**
1477  * This function is called if this client was notified for target restarting
1478  * by the MGS. A CONFIG_READ RPC is going to send to fetch recovery logs.
1479  */
1480 static int mgc_process_recover_log(struct obd_device *obd,
1481                                    struct config_llog_data *cld)
1482 {
1483         struct ptlrpc_request *req = NULL;
1484         struct config_llog_instance *cfg = &cld->cld_cfg;
1485         struct mgs_config_body *body;
1486         struct mgs_config_res  *res;
1487         struct ptlrpc_bulk_desc *desc;
1488         struct page **pages;
1489         int nrpages;
1490         bool eof = true;
1491         bool mne_swab = false;
1492         int i;
1493         int ealen;
1494         int rc;
1495
1496         /* allocate buffer for bulk transfer.
1497          * if this is the first time for this mgs to read logs,
1498          * CONFIG_READ_NRPAGES_INIT will be used since it will read all logs
1499          * once; otherwise, it only reads increment of logs, this should be
1500          * small and CONFIG_READ_NRPAGES will be used.
1501          */
1502         nrpages = CONFIG_READ_NRPAGES;
1503         if (cfg->cfg_last_idx == 0) /* the first time */
1504                 nrpages = CONFIG_READ_NRPAGES_INIT;
1505
1506         OBD_ALLOC(pages, sizeof(*pages) * nrpages);
1507         if (pages == NULL)
1508                 GOTO(out, rc = -ENOMEM);
1509
1510         for (i = 0; i < nrpages; i++) {
1511                 pages[i] = alloc_page(GFP_IOFS);
1512                 if (pages[i] == NULL)
1513                         GOTO(out, rc = -ENOMEM);
1514         }
1515
1516 again:
1517         LASSERT(cld_is_recover(cld));
1518         LASSERT(mutex_is_locked(&cld->cld_lock));
1519         req = ptlrpc_request_alloc(class_exp2cliimp(cld->cld_mgcexp),
1520                                    &RQF_MGS_CONFIG_READ);
1521         if (req == NULL)
1522                 GOTO(out, rc = -ENOMEM);
1523
1524         rc = ptlrpc_request_pack(req, LUSTRE_MGS_VERSION, MGS_CONFIG_READ);
1525         if (rc)
1526                 GOTO(out, rc);
1527
1528         /* pack request */
1529         body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
1530         LASSERT(body != NULL);
1531         LASSERT(sizeof(body->mcb_name) > strlen(cld->cld_logname));
1532         if (strlcpy(body->mcb_name, cld->cld_logname, sizeof(body->mcb_name))
1533             >= sizeof(body->mcb_name))
1534                 GOTO(out, rc = -E2BIG);
1535         body->mcb_offset = cfg->cfg_last_idx + 1;
1536         body->mcb_type   = cld->cld_type;
1537         body->mcb_bits   = PAGE_CACHE_SHIFT;
1538         body->mcb_units  = nrpages;
1539
1540         /* allocate bulk transfer descriptor */
1541         desc = ptlrpc_prep_bulk_imp(req, nrpages, 1, BULK_PUT_SINK,
1542                                     MGS_BULK_PORTAL);
1543         if (desc == NULL)
1544                 GOTO(out, rc = -ENOMEM);
1545
1546         for (i = 0; i < nrpages; i++)
1547                 ptlrpc_prep_bulk_page_pin(desc, pages[i], 0, PAGE_CACHE_SIZE);
1548
1549         ptlrpc_request_set_replen(req);
1550         rc = ptlrpc_queue_wait(req);
1551         if (rc)
1552                 GOTO(out, rc);
1553
1554         res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
1555         if (res->mcr_size < res->mcr_offset)
1556                 GOTO(out, rc = -EINVAL);
1557
1558         /* always update the index even though it might have errors with
1559          * handling the recover logs */
1560         cfg->cfg_last_idx = res->mcr_offset;
1561         eof = res->mcr_offset == res->mcr_size;
1562
1563         CDEBUG(D_INFO, "Latest version "LPD64", more %d.\n",
1564                res->mcr_offset, eof == false);
1565
1566         ealen = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, 0);
1567         if (ealen < 0)
1568                 GOTO(out, rc = ealen);
1569
1570         if (ealen > nrpages << PAGE_CACHE_SHIFT)
1571                 GOTO(out, rc = -EINVAL);
1572
1573         if (ealen == 0) { /* no logs transferred */
1574                 if (!eof)
1575                         rc = -EINVAL;
1576                 GOTO(out, rc);
1577         }
1578
1579         mne_swab = !!ptlrpc_rep_need_swab(req);
1580 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 50, 0)
1581         /* This import flag means the server did an extra swab of IR MNE
1582          * records (fixed in LU-1252), reverse it here if needed. LU-1644 */
1583         if (unlikely(req->rq_import->imp_need_mne_swab))
1584                 mne_swab = !mne_swab;
1585 #else
1586 #warning "LU-1644: Remove old OBD_CONNECT_MNE_SWAB fixup and imp_need_mne_swab"
1587 #endif
1588
1589         for (i = 0; i < nrpages && ealen > 0; i++) {
1590                 int rc2;
1591                 void *ptr;
1592
1593                 ptr = kmap(pages[i]);
1594                 rc2 = mgc_apply_recover_logs(obd, cld, res->mcr_offset, ptr,
1595                                              min_t(int, ealen, PAGE_CACHE_SIZE),
1596                                              mne_swab);
1597                 kunmap(pages[i]);
1598                 if (rc2 < 0) {
1599                         CWARN("Process recover log %s error %d\n",
1600                               cld->cld_logname, rc2);
1601                         break;
1602                 }
1603
1604                 ealen -= PAGE_CACHE_SIZE;
1605         }
1606
1607 out:
1608         if (req)
1609                 ptlrpc_req_finished(req);
1610
1611         if (rc == 0 && !eof)
1612                 goto again;
1613
1614         if (pages) {
1615                 for (i = 0; i < nrpages; i++) {
1616                         if (pages[i] == NULL)
1617                                 break;
1618                         __free_page(pages[i]);
1619                 }
1620                 OBD_FREE(pages, sizeof(*pages) * nrpages);
1621         }
1622         return rc;
1623 }
1624
1625 static int mgc_llog_local_copy(const struct lu_env *env,
1626                                struct obd_device *obd,
1627                                struct llog_ctxt *rctxt,
1628                                struct llog_ctxt *lctxt, char *logname)
1629 {
1630         char    *temp_log;
1631         int      rc;
1632
1633
1634
1635         /*
1636          * - copy it to backup using llog_backup()
1637          * - copy remote llog to logname using llog_backup()
1638          * - if failed then move backup to logname again
1639          */
1640
1641         OBD_ALLOC(temp_log, strlen(logname) + 1);
1642         if (!temp_log)
1643                 return -ENOMEM;
1644         sprintf(temp_log, "%sT", logname);
1645
1646         /* make a copy of local llog at first */
1647         rc = llog_backup(env, obd, lctxt, lctxt, logname, temp_log);
1648         if (rc < 0 && rc != -ENOENT)
1649                 GOTO(out, rc);
1650         /* copy remote llog to the local copy */
1651         rc = llog_backup(env, obd, rctxt, lctxt, logname, logname);
1652         if (rc == -ENOENT) {
1653                 /* no remote llog, delete local one too */
1654                 llog_erase(env, lctxt, NULL, logname);
1655         } else if (rc < 0) {
1656                 /* error during backup, get local one back from the copy */
1657                 llog_backup(env, obd, lctxt, lctxt, temp_log, logname);
1658 out:
1659                 CERROR("%s: failed to copy remote log %s: rc = %d\n",
1660                        obd->obd_name, logname, rc);
1661         }
1662         llog_erase(env, lctxt, NULL, temp_log);
1663         OBD_FREE(temp_log, strlen(logname) + 1);
1664         return rc;
1665 }
1666
1667 /* local_only means it cannot get remote llogs */
1668 static int mgc_process_cfg_log(struct obd_device *mgc,
1669                                struct config_llog_data *cld, int local_only)
1670 {
1671         struct llog_ctxt        *ctxt, *lctxt = NULL;
1672         struct dt_object        *cl_mgc_dir = mgc->u.cli.cl_mgc_configs_dir;
1673         struct lustre_sb_info   *lsi = NULL;
1674         int                      rc = 0;
1675         bool                     sptlrpc_started = false;
1676         struct lu_env           *env;
1677
1678         LASSERT(cld);
1679         LASSERT(mutex_is_locked(&cld->cld_lock));
1680
1681         /*
1682          * local copy of sptlrpc log is controlled elsewhere, don't try to
1683          * read it up here.
1684          */
1685         if (cld_is_sptlrpc(cld) && local_only)
1686                 return 0;
1687
1688         if (cld->cld_cfg.cfg_sb)
1689                 lsi = s2lsi(cld->cld_cfg.cfg_sb);
1690
1691         OBD_ALLOC_PTR(env);
1692         if (env == NULL)
1693                 return -ENOMEM;
1694
1695         rc = lu_env_init(env, LCT_MG_THREAD);
1696         if (rc)
1697                 GOTO(out_free, rc);
1698
1699         ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1700         LASSERT(ctxt);
1701
1702         lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT);
1703
1704         /* Copy the setup log locally if we can. Don't mess around if we're
1705          * running an MGS though (logs are already local). */
1706         if (lctxt && lsi && IS_SERVER(lsi) && !IS_MGS(lsi) &&
1707             cl_mgc_dir != NULL &&
1708             lu2dt_dev(cl_mgc_dir->do_lu.lo_dev) == lsi->lsi_dt_dev) {
1709                 if (!local_only)
1710                         /* Only try to copy log if we have the lock. */
1711                         rc = mgc_llog_local_copy(env, mgc, ctxt, lctxt,
1712                                                  cld->cld_logname);
1713                 if (local_only || rc) {
1714                         if (llog_is_empty(env, lctxt, cld->cld_logname)) {
1715                                 LCONSOLE_ERROR_MSG(0x13a,
1716                                                    "Failed to get MGS log %s and no local copy.\n",
1717                                                    cld->cld_logname);
1718                                 GOTO(out_pop, rc = -ENOENT);
1719                         }
1720                         CDEBUG(D_MGC,
1721                                "Failed to get MGS log %s, using local copy for now, will try to update later.\n",
1722                                cld->cld_logname);
1723                 }
1724                 /* Now, whether we copied or not, start using the local llog.
1725                  * If we failed to copy, we'll start using whatever the old
1726                  * log has. */
1727                 llog_ctxt_put(ctxt);
1728                 ctxt = lctxt;
1729                 lctxt = NULL;
1730         } else {
1731                 if (local_only) /* no local log at client side */
1732                         GOTO(out_pop, rc = -EIO);
1733         }
1734
1735         if (cld_is_sptlrpc(cld)) {
1736                 sptlrpc_conf_log_update_begin(cld->cld_logname);
1737                 sptlrpc_started = true;
1738         }
1739
1740         /* logname and instance info should be the same, so use our
1741          * copy of the instance for the update.  The cfg_last_idx will
1742          * be updated here. */
1743         rc = class_config_parse_llog(env, ctxt, cld->cld_logname,
1744                                      &cld->cld_cfg);
1745
1746 out_pop:
1747         __llog_ctxt_put(env, ctxt);
1748         if (lctxt)
1749                 __llog_ctxt_put(env, lctxt);
1750
1751         /*
1752          * update settings on existing OBDs. doing it inside
1753          * of llog_process_lock so no device is attaching/detaching
1754          * in parallel.
1755          * the logname must be <fsname>-sptlrpc
1756          */
1757         if (sptlrpc_started) {
1758                 LASSERT(cld_is_sptlrpc(cld));
1759                 sptlrpc_conf_log_update_end(cld->cld_logname);
1760                 class_notify_sptlrpc_conf(cld->cld_logname,
1761                                           strlen(cld->cld_logname) -
1762                                           strlen("-sptlrpc"));
1763         }
1764
1765         lu_env_fini(env);
1766 out_free:
1767         OBD_FREE_PTR(env);
1768         return rc;
1769 }
1770
1771 /** Get a config log from the MGS and process it.
1772  * This func is called for both clients and servers.
1773  * Copy the log locally before parsing it if appropriate (non-MGS server)
1774  */
1775 int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)
1776 {
1777         struct lustre_handle lockh = { 0 };
1778         __u64 flags = LDLM_FL_NO_LRU;
1779         int rc = 0, rcl;
1780
1781         LASSERT(cld);
1782
1783         /* I don't want multiple processes running process_log at once --
1784            sounds like badness.  It actually might be fine, as long as
1785            we're not trying to update from the same log
1786            simultaneously (in which case we should use a per-log sem.) */
1787         mutex_lock(&cld->cld_lock);
1788         if (cld->cld_stopping) {
1789                 mutex_unlock(&cld->cld_lock);
1790                 return 0;
1791         }
1792
1793         OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PAUSE_PROCESS_LOG, 20);
1794
1795         CDEBUG(D_MGC, "Process log %s:%p from %d\n", cld->cld_logname,
1796                cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
1797
1798         /* Get the cfg lock on the llog */
1799         rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, NULL, LDLM_PLAIN, NULL,
1800                           LCK_CR, &flags, NULL, NULL, NULL,
1801                           cld, 0, NULL, &lockh);
1802         if (rcl == 0) {
1803                 /* Get the cld, it will be released in mgc_blocking_ast. */
1804                 config_log_get(cld);
1805                 rc = ldlm_lock_set_data(&lockh, (void *)cld);
1806                 LASSERT(rc == 0);
1807         } else {
1808                 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
1809
1810                 /* mark cld_lostlock so that it will requeue
1811                  * after MGC becomes available. */
1812                 cld->cld_lostlock = 1;
1813                 /* Get extra reference, it will be put in requeue thread */
1814                 config_log_get(cld);
1815         }
1816
1817
1818         if (cld_is_recover(cld)) {
1819                 rc = 0; /* this is not a fatal error for recover log */
1820                 if (rcl == 0)
1821                         rc = mgc_process_recover_log(mgc, cld);
1822         } else {
1823                 rc = mgc_process_cfg_log(mgc, cld, rcl != 0);
1824         }
1825
1826         CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
1827                mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
1828
1829         mutex_unlock(&cld->cld_lock);
1830
1831         /* Now drop the lock so MGS can revoke it */
1832         if (!rcl) {
1833                 rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, NULL,
1834                                  LCK_CR, &lockh);
1835                 if (rcl)
1836                         CERROR("Can't drop cfg lock: %d\n", rcl);
1837         }
1838
1839         return rc;
1840 }
1841
1842
1843 /** Called from lustre_process_log.
1844  * LCFG_LOG_START gets the config log from the MGS, processes it to start
1845  * any services, and adds it to the list logs to watch (follow).
1846  */
1847 static int mgc_process_config(struct obd_device *obd, obd_count len, void *buf)
1848 {
1849         struct lustre_cfg *lcfg = buf;
1850         struct config_llog_instance *cfg = NULL;
1851         char *logname;
1852         int rc = 0;
1853
1854         switch (lcfg->lcfg_command) {
1855         case LCFG_LOV_ADD_OBD: {
1856                 /* Overloading this cfg command: register a new target */
1857                 struct mgs_target_info *mti;
1858
1859                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
1860                     sizeof(struct mgs_target_info))
1861                         GOTO(out, rc = -EINVAL);
1862
1863                 mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1);
1864                 CDEBUG(D_MGC, "add_target %s %#x\n",
1865                        mti->mti_svname, mti->mti_flags);
1866                 rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti);
1867                 break;
1868         }
1869         case LCFG_LOV_DEL_OBD:
1870                 /* Unregister has no meaning at the moment. */
1871                 CERROR("lov_del_obd unimplemented\n");
1872                 rc = -ENOSYS;
1873                 break;
1874         case LCFG_SPTLRPC_CONF: {
1875                 rc = sptlrpc_process_config(lcfg);
1876                 break;
1877         }
1878         case LCFG_LOG_START: {
1879                 struct config_llog_data *cld;
1880                 struct super_block *sb;
1881
1882                 logname = lustre_cfg_string(lcfg, 1);
1883                 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
1884                 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
1885
1886                 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
1887                        cfg->cfg_last_idx);
1888
1889                 /* We're only called through here on the initial mount */
1890                 rc = config_log_add(obd, logname, cfg, sb);
1891                 if (rc)
1892                         break;
1893                 cld = config_log_find(logname, cfg);
1894                 if (cld == NULL) {
1895                         rc = -ENOENT;
1896                         break;
1897                 }
1898
1899                 /* COMPAT_146 */
1900                 /* FIXME only set this for old logs!  Right now this forces
1901                    us to always skip the "inside markers" check */
1902                 cld->cld_cfg.cfg_flags |= CFG_F_COMPAT146;
1903
1904                 rc = mgc_process_log(obd, cld);
1905                 if (rc == 0 && cld->cld_recover != NULL) {
1906                         if (OCD_HAS_FLAG(&obd->u.cli.cl_import->
1907                                          imp_connect_data, IMP_RECOV)) {
1908                                 rc = mgc_process_log(obd, cld->cld_recover);
1909                         } else {
1910                                 struct config_llog_data *cir = cld->cld_recover;
1911                                 cld->cld_recover = NULL;
1912                                 config_log_put(cir);
1913                         }
1914                         if (rc)
1915                                 CERROR("Cannot process recover llog %d\n", rc);
1916                 }
1917
1918                 if (rc == 0 && cld->cld_params != NULL) {
1919                         rc = mgc_process_log(obd, cld->cld_params);
1920                         if (rc == -ENOENT) {
1921                                 CDEBUG(D_MGC,
1922                                        "There is no params config file yet\n");
1923                                 rc = 0;
1924                         }
1925                         /* params log is optional */
1926                         if (rc)
1927                                 CERROR(
1928                                        "%s: can't process params llog: rc = %d\n",
1929                                        obd->obd_name, rc);
1930                 }
1931                 config_log_put(cld);
1932
1933                 break;
1934         }
1935         case LCFG_LOG_END: {
1936                 logname = lustre_cfg_string(lcfg, 1);
1937
1938                 if (lcfg->lcfg_bufcount >= 2)
1939                         cfg = (struct config_llog_instance *)lustre_cfg_buf(
1940                                 lcfg, 2);
1941                 rc = config_log_end(logname, cfg);
1942                 break;
1943         }
1944         default: {
1945                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1946                 GOTO(out, rc = -EINVAL);
1947
1948         }
1949         }
1950 out:
1951         return rc;
1952 }
1953
1954 struct obd_ops mgc_obd_ops = {
1955         .o_owner        = THIS_MODULE,
1956         .o_setup        = mgc_setup,
1957         .o_precleanup   = mgc_precleanup,
1958         .o_cleanup      = mgc_cleanup,
1959         .o_add_conn     = client_import_add_conn,
1960         .o_del_conn     = client_import_del_conn,
1961         .o_connect      = client_connect_import,
1962         .o_disconnect   = client_disconnect_export,
1963         /* .o_enqueue      = mgc_enqueue, */
1964         .o_cancel       = mgc_cancel,
1965         /* .o_iocontrol    = mgc_iocontrol, */
1966         .o_set_info_async = mgc_set_info_async,
1967         .o_get_info       = mgc_get_info,
1968         .o_import_event = mgc_import_event,
1969         .o_process_config = mgc_process_config,
1970 };
1971
1972 int __init mgc_init(void)
1973 {
1974         return class_register_type(&mgc_obd_ops, NULL, NULL,
1975                                    LUSTRE_MGC_NAME, NULL);
1976 }
1977
1978 static void /*__exit*/ mgc_exit(void)
1979 {
1980         class_unregister_type(LUSTRE_MGC_NAME);
1981 }
1982
1983 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1984 MODULE_DESCRIPTION("Lustre Management Client");
1985 MODULE_LICENSE("GPL");
1986
1987 module_init(mgc_init);
1988 module_exit(mgc_exit);