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, 2013, 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 CFS_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         ENTRY;
 123         cfs_atomic_inc(&cld->cld_refcount);
 124         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
 125                cfs_atomic_read(&cld->cld_refcount));
 126         RETURN(0);
 127 }
 128
 129 /* Drop a reference to a config log.  When no longer referenced,
 130    we can free the config log data */
 131 static void config_log_put(struct config_llog_data *cld)
 132 {
 133         ENTRY;
 134
 135         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
 136                cfs_atomic_read(&cld->cld_refcount));
 137         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
 138
 139         /* spinlock to make sure no item with 0 refcount in the list */
 140         if (cfs_atomic_dec_and_lock(&cld->cld_refcount, &config_list_lock)) {
 141                 cfs_list_del(&cld->cld_list_chain);
 142                 spin_unlock(&config_list_lock);
 143
 144                 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
 145
 146                 if (cld->cld_recover)
 147                         config_log_put(cld->cld_recover);
 148                 if (cld->cld_sptlrpc)
 149                         config_log_put(cld->cld_sptlrpc);
 150                 if (cld->cld_params)
 151                         config_log_put(cld->cld_params);
 152                 if (cld_is_sptlrpc(cld))
 153                         sptlrpc_conf_log_stop(cld->cld_logname);
 154
 155                 class_export_put(cld->cld_mgcexp);
 156                 OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1);
 157         }
 158
 159         EXIT;
 160 }
 161
 162 /* Find a config log by name */
 163 static
 164 struct config_llog_data *config_log_find(char *logname,
 165                                          struct config_llog_instance *cfg)
 166 {
 167         struct config_llog_data *cld;
 168         struct config_llog_data *found = NULL;
 169         void *                   instance;
 170         ENTRY;
 171
 172         LASSERT(logname != NULL);
 173
 174         instance = cfg ? cfg->cfg_instance : NULL;
 175         spin_lock(&config_list_lock);
 176         cfs_list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 177                 /* check if instance equals */
 178                 if (instance != cld->cld_cfg.cfg_instance)
 179                         continue;
 180
 181                 /* instance may be NULL, should check name */
 182                 if (strcmp(logname, cld->cld_logname) == 0) {
 183                         found = cld;
 184                         break;
 185                 }
 186         }
 187         if (found) {
 188                 cfs_atomic_inc(&found->cld_refcount);
 189                 LASSERT(found->cld_stopping == 0 || cld_is_sptlrpc(found) == 0);
 190         }
 191         spin_unlock(&config_list_lock);
 192         RETURN(found);
 193 }
 194
 195 static
 196 struct config_llog_data *do_config_log_add(struct obd_device *obd,
 197                                            char *logname,
 198                                            int type,
 199                                            struct config_llog_instance *cfg,
 200                                            struct super_block *sb)
 201 {
 202         struct config_llog_data *cld;
 203         int                      rc;
 204         ENTRY;
 205
 206         CDEBUG(D_MGC, "do adding config log %s:%p\n", logname,
 207                cfg ? cfg->cfg_instance : 0);
 208
 209         OBD_ALLOC(cld, sizeof(*cld) + strlen(logname) + 1);
 210         if (!cld)
 211                 RETURN(ERR_PTR(-ENOMEM));
 212
 213         strcpy(cld->cld_logname, logname);
 214         if (cfg)
 215                 cld->cld_cfg = *cfg;
 216         else
 217                 cld->cld_cfg.cfg_callback = class_config_llog_handler;
 218         mutex_init(&cld->cld_lock);
 219         cld->cld_cfg.cfg_last_idx = 0;
 220         cld->cld_cfg.cfg_flags = 0;
 221         cld->cld_cfg.cfg_sb = sb;
 222         cld->cld_type = type;
 223         cfs_atomic_set(&cld->cld_refcount, 1);
 224
 225         /* Keep the mgc around until we are done */
 226         cld->cld_mgcexp = class_export_get(obd->obd_self_export);
 227
 228         if (cld_is_sptlrpc(cld)) {
 229                 sptlrpc_conf_log_start(logname);
 230                 cld->cld_cfg.cfg_obdname = obd->obd_name;
 231         }
 232
 233         rc = mgc_logname2resid(logname, &cld->cld_resid, type);
 234
 235         spin_lock(&config_list_lock);
 236         cfs_list_add(&cld->cld_list_chain, &config_llog_list);
 237         spin_unlock(&config_list_lock);
 238
 239         if (rc) {
 240                 config_log_put(cld);
 241                 RETURN(ERR_PTR(rc));
 242         }
 243
 244         if (cld_is_sptlrpc(cld)) {
 245                 rc = mgc_process_log(obd, cld);
 246                 if (rc && rc != -ENOENT)
 247                         CERROR("failed processing sptlrpc log: %d\n", rc);
 248         }
 249
 250         RETURN(cld);
 251 }
 252
 253 static struct config_llog_data *config_recover_log_add(struct obd_device *obd,
 254         char *fsname,
 255         struct config_llog_instance *cfg,
 256         struct super_block *sb)
 257 {
 258         struct config_llog_instance lcfg = *cfg;
 259         struct lustre_sb_info *lsi = s2lsi(sb);
 260         struct config_llog_data *cld;
 261         char logname[32];
 262
 263         if (IS_OST(lsi))
 264                 return NULL;
 265
 266         /* for osp-on-ost, see lustre_start_osp() */
 267         if (IS_MDT(lsi) && lcfg.cfg_instance)
 268                 return NULL;
 269
 270         /* we have to use different llog for clients and mdts for cmd
 271          * where only clients are notified if one of cmd server restarts */
 272         LASSERT(strlen(fsname) < sizeof(logname) / 2);
 273         strcpy(logname, fsname);
 274         if (IS_SERVER(lsi)) { /* mdt */
 275                 LASSERT(lcfg.cfg_instance == NULL);
 276                 lcfg.cfg_instance = sb;
 277                 strcat(logname, "-mdtir");
 278         } else {
 279                 LASSERT(lcfg.cfg_instance != NULL);
 280                 strcat(logname, "-cliir");
 281         }
 282
 283         cld = do_config_log_add(obd, logname, CONFIG_T_RECOVER, &lcfg, sb);
 284         return cld;
 285 }
 286
 287 static struct config_llog_data *config_params_log_add(struct obd_device *obd,
 288         struct config_llog_instance *cfg, struct super_block *sb)
 289 {
 290         struct config_llog_instance     lcfg = *cfg;
 291         struct config_llog_data         *cld;
 292
 293         lcfg.cfg_instance = sb;
 294
 295         cld = do_config_log_add(obd, PARAMS_FILENAME, CONFIG_T_PARAMS,
 296                                 &lcfg, sb);
 297
 298         return cld;
 299 }
 300
 301 /** Add this log to the list of active logs watched by an MGC.
 302  * Active means we're watching for updates.
 303  * We have one active log per "mount" - client instance or servername.
 304  * Each instance may be at a different point in the log.
 305  */
 306 static int config_log_add(struct obd_device *obd, char *logname,
 307                           struct config_llog_instance *cfg,
 308                           struct super_block *sb)
 309 {
 310         struct lustre_sb_info   *lsi = s2lsi(sb);
 311         struct config_llog_data *cld;
 312         struct config_llog_data *sptlrpc_cld;
 313         struct config_llog_data *params_cld;
 314         char                    seclogname[32];
 315         char                    *ptr;
 316         int                     rc;
 317         ENTRY;
 318
 319         CDEBUG(D_MGC, "adding config log %s:%p\n", logname, cfg->cfg_instance);
 320
 321         /*
 322          * for each regular log, the depended sptlrpc log name is
 323          * <fsname>-sptlrpc. multiple regular logs may share one sptlrpc log.
 324          */
 325         ptr = strrchr(logname, '-');
 326         if (ptr == NULL || ptr - logname > 8) {
 327                 CERROR("logname %s is too long\n", logname);
 328                 RETURN(-EINVAL);
 329         }
 330
 331         memcpy(seclogname, logname, ptr - logname);
 332         strcpy(seclogname + (ptr - logname), "-sptlrpc");
 333
 334         sptlrpc_cld = config_log_find(seclogname, NULL);
 335         if (sptlrpc_cld == NULL) {
 336                 sptlrpc_cld = do_config_log_add(obd, seclogname,
 337                                                 CONFIG_T_SPTLRPC, NULL, NULL);
 338                 if (IS_ERR(sptlrpc_cld)) {
 339                         CERROR("can't create sptlrpc log: %s\n", seclogname);
 340                         GOTO(out_err, rc = PTR_ERR(sptlrpc_cld));
 341                 }
 342         }
 343         params_cld = config_params_log_add(obd, cfg, sb);
 344         if (IS_ERR(params_cld)) {
 345                 rc = PTR_ERR(params_cld);
 346                 CERROR("%s: can't create params log: rc = %d\n",
 347                        obd->obd_name, rc);
 348                 GOTO(out_err1, rc);
 349         }
 350
 351         cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb);
 352         if (IS_ERR(cld)) {
 353                 CERROR("can't create log: %s\n", logname);
 354                 GOTO(out_err2, rc = PTR_ERR(cld));
 355         }
 356
 357         cld->cld_sptlrpc = sptlrpc_cld;
 358         cld->cld_params = params_cld;
 359
 360         LASSERT(lsi->lsi_lmd);
 361         if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR)) {
 362                 struct config_llog_data *recover_cld;
 363                 ptr = strrchr(seclogname, '-');
 364                 if (ptr != NULL) {
 365                         *ptr = 0;
 366                 }
 367                 else {
 368                         CERROR("sptlrpc log name not correct: %s", seclogname);
 369                         config_log_put(cld);
 370                         RETURN(-EINVAL);
 371                 }
 372                 recover_cld = config_recover_log_add(obd, seclogname, cfg, sb);
 373                 if (IS_ERR(recover_cld))
 374                         GOTO(out_err3, rc = PTR_ERR(recover_cld));
 375                 cld->cld_recover = recover_cld;
 376         }
 377
 378         RETURN(0);
 379
 380 out_err3:
 381         config_log_put(cld);
 382
 383 out_err2:
 384         config_log_put(params_cld);
 385
 386 out_err1:
 387         config_log_put(sptlrpc_cld);
 388
 389 out_err:
 390         RETURN(rc);
 391 }
 392
 393 DEFINE_MUTEX(llog_process_lock);
 394
 395 /** Stop watching for updates on this log.
 396  */
 397 static int config_log_end(char *logname, struct config_llog_instance *cfg)
 398 {
 399         struct config_llog_data *cld;
 400         struct config_llog_data *cld_sptlrpc = NULL;
 401         struct config_llog_data *cld_params = NULL;
 402         struct config_llog_data *cld_recover = NULL;
 403         int rc = 0;
 404         ENTRY;
 405
 406         cld = config_log_find(logname, cfg);
 407         if (cld == NULL)
 408                 RETURN(-ENOENT);
 409
 410         mutex_lock(&cld->cld_lock);
 411         /*
 412          * if cld_stopping is set, it means we didn't start the log thus
 413          * not owning the start ref. this can happen after previous umount:
 414          * the cld still hanging there waiting for lock cancel, and we
 415          * remount again but failed in the middle and call log_end without
 416          * calling start_log.
 417          */
 418         if (unlikely(cld->cld_stopping)) {
 419                 mutex_unlock(&cld->cld_lock);
 420                 /* drop the ref from the find */
 421                 config_log_put(cld);
 422                 RETURN(rc);
 423         }
 424
 425         cld->cld_stopping = 1;
 426
 427         cld_recover = cld->cld_recover;
 428         cld->cld_recover = NULL;
 429         mutex_unlock(&cld->cld_lock);
 430
 431         if (cld_recover) {
 432                 mutex_lock(&cld_recover->cld_lock);
 433                 cld_recover->cld_stopping = 1;
 434                 mutex_unlock(&cld_recover->cld_lock);
 435                 config_log_put(cld_recover);
 436         }
 437
 438         spin_lock(&config_list_lock);
 439         cld_sptlrpc = cld->cld_sptlrpc;
 440         cld->cld_sptlrpc = NULL;
 441         cld_params = cld->cld_params;
 442         cld->cld_params = NULL;
 443         spin_unlock(&config_list_lock);
 444
 445         if (cld_sptlrpc)
 446                 config_log_put(cld_sptlrpc);
 447
 448         if (cld_params) {
 449                 mutex_lock(&cld_params->cld_lock);
 450                 cld_params->cld_stopping = 1;
 451                 mutex_unlock(&cld_params->cld_lock);
 452                 config_log_put(cld_params);
 453         }
 454
 455         /* drop the ref from the find */
 456         config_log_put(cld);
 457         /* drop the start ref */
 458         config_log_put(cld);
 459
 460         CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
 461                rc);
 462         RETURN(rc);
 463 }
 464
 465 int lprocfs_mgc_rd_ir_state(char *page, char **start, off_t off,
 466                             int count, int *eof, void *data)
 467 {
 468         struct obd_device       *obd = data;
 469         struct obd_import       *imp = obd->u.cli.cl_import;
 470         struct obd_connect_data *ocd = &imp->imp_connect_data;
 471         struct config_llog_data *cld;
 472         int rc = 0;
 473         ENTRY;
 474
 475         rc = snprintf(page, count, "imperative_recovery: %s\n",
 476                       OCD_HAS_FLAG(ocd, IMP_RECOV) ? "ENABLED" : "DISABLED");
 477         rc += snprintf(page + rc, count - rc, "client_state:\n");
 478
 479         spin_lock(&config_list_lock);
 480         cfs_list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 481                 if (cld->cld_recover == NULL)
 482                         continue;
 483                 rc += snprintf(page + rc, count - rc,
 484                                "    - { client: %s, nidtbl_version: %u }\n",
 485                                cld->cld_logname,
 486                                cld->cld_recover->cld_cfg.cfg_last_idx);
 487         }
 488         spin_unlock(&config_list_lock);
 489
 490         RETURN(rc);
 491 }
 492
 493 /* reenqueue any lost locks */
 494 #define RQ_RUNNING 0x1
 495 #define RQ_NOW     0x2
 496 #define RQ_LATER   0x4
 497 #define RQ_STOP    0x8
 498 static int                    rq_state = 0;
 499 static wait_queue_head_t      rq_waitq;
 500 static DECLARE_COMPLETION(rq_exit);
 501
 502 static void do_requeue(struct config_llog_data *cld)
 503 {
 504         ENTRY;
 505         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
 506
 507         /* Do not run mgc_process_log on a disconnected export or an
 508            export which is being disconnected. Take the client
 509            semaphore to make the check non-racy. */
 510         down_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
 511         if (cld->cld_mgcexp->exp_obd->u.cli.cl_conn_count != 0) {
 512                 CDEBUG(D_MGC, "updating log %s\n", cld->cld_logname);
 513                 mgc_process_log(cld->cld_mgcexp->exp_obd, cld);
 514         } else {
 515                 CDEBUG(D_MGC, "disconnecting, won't update log %s\n",
 516                        cld->cld_logname);
 517         }
 518         up_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
 519
 520         EXIT;
 521 }
 522
 523 /* this timeout represents how many seconds MGC should wait before
 524  * requeue config and recover lock to the MGS. We need to randomize this
 525  * in order to not flood the MGS.
 526  */
 527 #define MGC_TIMEOUT_MIN_SECONDS   5
 528 #define MGC_TIMEOUT_RAND_CENTISEC 0x1ff /* ~500 */
 529
 530 static int mgc_requeue_thread(void *data)
 531 {
 532         int rc = 0;
 533         ENTRY;
 534
 535         CDEBUG(D_MGC, "Starting requeue thread\n");
 536
 537         /* Keep trying failed locks periodically */
 538         spin_lock(&config_list_lock);
 539         rq_state |= RQ_RUNNING;
 540         while (1) {
 541                 struct l_wait_info lwi;
 542                 struct config_llog_data *cld, *cld_prev;
 543                 int rand = cfs_rand() & MGC_TIMEOUT_RAND_CENTISEC;
 544                 int stopped = !!(rq_state & RQ_STOP);
 545                 int to;
 546
 547                 /* Any new or requeued lostlocks will change the state */
 548                 rq_state &= ~(RQ_NOW | RQ_LATER);
 549                 spin_unlock(&config_list_lock);
 550
 551                 /* Always wait a few seconds to allow the server who
 552                    caused the lock revocation to finish its setup, plus some
 553                    random so everyone doesn't try to reconnect at once. */
 554                 to = MGC_TIMEOUT_MIN_SECONDS * HZ;
 555                 to += rand * HZ / 100; /* rand is centi-seconds */
 556                 lwi = LWI_TIMEOUT(to, NULL, NULL);
 557                 l_wait_event(rq_waitq, rq_state & RQ_STOP, &lwi);
 558
 559                 /*
 560                  * iterate & processing through the list. for each cld, process
 561                  * its depending sptlrpc cld firstly (if any) and then itself.
 562                  *
 563                  * it's guaranteed any item in the list must have
 564                  * reference > 0; and if cld_lostlock is set, at
 565                  * least one reference is taken by the previous enqueue.
 566                  */
 567                 cld_prev = NULL;
 568
 569                 spin_lock(&config_list_lock);
 570                 cfs_list_for_each_entry(cld, &config_llog_list,
 571                                         cld_list_chain) {
 572                         if (!cld->cld_lostlock)
 573                                 continue;
 574
 575                         spin_unlock(&config_list_lock);
 576
 577                         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
 578
 579                         /* Whether we enqueued again or not in mgc_process_log,
 580                          * we're done with the ref from the old enqueue */
 581                         if (cld_prev)
 582                                 config_log_put(cld_prev);
 583                         cld_prev = cld;
 584
 585                         cld->cld_lostlock = 0;
 586                         if (likely(!stopped))
 587                                 do_requeue(cld);
 588
 589                         spin_lock(&config_list_lock);
 590                 }
 591                 spin_unlock(&config_list_lock);
 592                 if (cld_prev)
 593                         config_log_put(cld_prev);
 594
 595                 /* break after scanning the list so that we can drop
 596                  * refcount to losing lock clds */
 597                 if (unlikely(stopped)) {
 598                         spin_lock(&config_list_lock);
 599                         break;
 600                 }
 601
 602                 /* Wait a bit to see if anyone else needs a requeue */
 603                 lwi = (struct l_wait_info) { 0 };
 604                 l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP),
 605                              &lwi);
 606                 spin_lock(&config_list_lock);
 607         }
 608         /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
 609         rq_state &= ~RQ_RUNNING;
 610         spin_unlock(&config_list_lock);
 611
 612         complete(&rq_exit);
 613
 614         CDEBUG(D_MGC, "Ending requeue thread\n");
 615         RETURN(rc);
 616 }
 617
 618 /* Add a cld to the list to requeue.  Start the requeue thread if needed.
 619    We are responsible for dropping the config log reference from here on out. */
 620 static void mgc_requeue_add(struct config_llog_data *cld)
 621 {
 622         ENTRY;
 623
 624         CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n",
 625                cld->cld_logname, cfs_atomic_read(&cld->cld_refcount),
 626                cld->cld_stopping, rq_state);
 627         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
 628
 629         mutex_lock(&cld->cld_lock);
 630         if (cld->cld_stopping || cld->cld_lostlock) {
 631                 mutex_unlock(&cld->cld_lock);
 632                 RETURN_EXIT;
 633         }
 634         /* this refcount will be released in mgc_requeue_thread. */
 635         config_log_get(cld);
 636         cld->cld_lostlock = 1;
 637         mutex_unlock(&cld->cld_lock);
 638
 639         /* Hold lock for rq_state */
 640         spin_lock(&config_list_lock);
 641         if (rq_state & RQ_STOP) {
 642                 spin_unlock(&config_list_lock);
 643                 cld->cld_lostlock = 0;
 644                 config_log_put(cld);
 645         } else {
 646                 rq_state |= RQ_NOW;
 647                 spin_unlock(&config_list_lock);
 648                 wake_up(&rq_waitq);
 649         }
 650         EXIT;
 651 }
 652
 653 /********************** class fns **********************/
 654 static int mgc_local_llog_init(const struct lu_env *env,
 655                                struct obd_device *obd,
 656                                struct obd_device *disk)
 657 {
 658         struct llog_ctxt        *ctxt;
 659         int                      rc;
 660
 661         ENTRY;
 662
 663         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_ORIG_CTXT, disk,
 664                         &llog_osd_ops);
 665         if (rc)
 666                 RETURN(rc);
 667
 668         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
 669         LASSERT(ctxt);
 670         ctxt->loc_dir = obd->u.cli.cl_mgc_configs_dir;
 671         llog_ctxt_put(ctxt);
 672
 673         RETURN(0);
 674 }
 675
 676 static int mgc_local_llog_fini(const struct lu_env *env,
 677                                struct obd_device *obd)
 678 {
 679         struct llog_ctxt *ctxt;
 680
 681         ENTRY;
 682
 683         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
 684         llog_cleanup(env, ctxt);
 685
 686         RETURN(0);
 687 }
 688
 689 static int mgc_fs_setup(struct obd_device *obd, struct super_block *sb)
 690 {
 691         struct lustre_sb_info   *lsi = s2lsi(sb);
 692         struct client_obd       *cli = &obd->u.cli;
 693         struct lu_fid            rfid, fid;
 694         struct dt_object        *root, *dto;
 695         struct lu_env           *env;
 696         int                      rc = 0;
 697
 698         ENTRY;
 699
 700         LASSERT(lsi);
 701         LASSERT(lsi->lsi_dt_dev);
 702
 703         OBD_ALLOC_PTR(env);
 704         if (env == NULL)
 705                 RETURN(-ENOMEM);
 706
 707         /* The mgc fs exclusion sem. Only one fs can be setup at a time. */
 708         down(&cli->cl_mgc_sem);
 709
 710         cfs_cleanup_group_info();
 711
 712         /* Setup the configs dir */
 713         rc = lu_env_init(env, LCT_MG_THREAD);
 714         if (rc)
 715                 GOTO(out_err, rc);
 716
 717         fid.f_seq = FID_SEQ_LOCAL_NAME;
 718         fid.f_oid = 1;
 719         fid.f_ver = 0;
 720         rc = local_oid_storage_init(env, lsi->lsi_dt_dev, &fid,
 721                                     &cli->cl_mgc_los);
 722         if (rc)
 723                 GOTO(out_env, rc);
 724
 725         rc = dt_root_get(env, lsi->lsi_dt_dev, &rfid);
 726         if (rc)
 727                 GOTO(out_env, rc);
 728
 729         root = dt_locate_at(env, lsi->lsi_dt_dev, &rfid,
 730                             &cli->cl_mgc_los->los_dev->dd_lu_dev);
 731         if (unlikely(IS_ERR(root)))
 732                 GOTO(out_los, rc = PTR_ERR(root));
 733
 734         dto = local_file_find_or_create(env, cli->cl_mgc_los, root,
 735                                         MOUNT_CONFIGS_DIR,
 736                                         S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
 737         lu_object_put_nocache(env, &root->do_lu);
 738         if (IS_ERR(dto))
 739                 GOTO(out_los, rc = PTR_ERR(dto));
 740
 741         cli->cl_mgc_configs_dir = dto;
 742
 743         LASSERT(lsi->lsi_osd_exp->exp_obd->obd_lvfs_ctxt.dt);
 744         rc = mgc_local_llog_init(env, obd, lsi->lsi_osd_exp->exp_obd);
 745         if (rc)
 746                 GOTO(out_llog, rc);
 747
 748         /* We take an obd ref to insure that we can't get to mgc_cleanup
 749          * without calling mgc_fs_cleanup first. */
 750         class_incref(obd, "mgc_fs", obd);
 751
 752         /* We keep the cl_mgc_sem until mgc_fs_cleanup */
 753         EXIT;
 754 out_llog:
 755         if (rc) {
 756                 lu_object_put(env, &cli->cl_mgc_configs_dir->do_lu);
 757                 cli->cl_mgc_configs_dir = NULL;
 758         }
 759 out_los:
 760         if (rc < 0) {
 761                 local_oid_storage_fini(env, cli->cl_mgc_los);
 762                 cli->cl_mgc_los = NULL;
 763                 up(&cli->cl_mgc_sem);
 764         }
 765 out_env:
 766         lu_env_fini(env);
 767 out_err:
 768         OBD_FREE_PTR(env);
 769         return rc;
 770 }
 771
 772 static int mgc_fs_cleanup(struct obd_device *obd)
 773 {
 774         struct lu_env            env;
 775         struct client_obd       *cli = &obd->u.cli;
 776         int                      rc;
 777
 778         ENTRY;
 779
 780         LASSERT(cli->cl_mgc_los != NULL);
 781
 782         rc = lu_env_init(&env, LCT_MG_THREAD);
 783         if (rc)
 784                 GOTO(unlock, rc);
 785
 786         mgc_local_llog_fini(&env, obd);
 787
 788         lu_object_put_nocache(&env, &cli->cl_mgc_configs_dir->do_lu);
 789         cli->cl_mgc_configs_dir = NULL;
 790
 791         local_oid_storage_fini(&env, cli->cl_mgc_los);
 792         cli->cl_mgc_los = NULL;
 793         lu_env_fini(&env);
 794
 795 unlock:
 796         class_decref(obd, "mgc_fs", obd);
 797         up(&cli->cl_mgc_sem);
 798
 799         RETURN(0);
 800 }
 801
 802 static int mgc_llog_init(const struct lu_env *env, struct obd_device *obd)
 803 {
 804         struct llog_ctxt        *ctxt;
 805         int                      rc;
 806
 807         ENTRY;
 808
 809         /* setup only remote ctxt, the local disk context is switched per each
 810          * filesystem during mgc_fs_setup() */
 811         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_REPL_CTXT, obd,
 812                         &llog_client_ops);
 813         if (rc)
 814                 RETURN(rc);
 815
 816         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 817         LASSERT(ctxt);
 818
 819         llog_initiator_connect(ctxt);
 820         llog_ctxt_put(ctxt);
 821
 822         RETURN(0);
 823 }
 824
 825 static int mgc_llog_fini(const struct lu_env *env, struct obd_device *obd)
 826 {
 827         struct llog_ctxt *ctxt;
 828
 829         ENTRY;
 830
 831         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 832         if (ctxt)
 833                 llog_cleanup(env, ctxt);
 834
 835         RETURN(0);
 836 }
 837
 838
 839 static cfs_atomic_t mgc_count = CFS_ATOMIC_INIT(0);
 840 static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
 841 {
 842         int rc = 0;
 843         ENTRY;
 844
 845         switch (stage) {
 846         case OBD_CLEANUP_EARLY:
 847                 break;
 848         case OBD_CLEANUP_EXPORTS:
 849                 if (cfs_atomic_dec_and_test(&mgc_count)) {
 850                         int running;
 851                         /* stop requeue thread */
 852                         spin_lock(&config_list_lock);
 853                         running = rq_state & RQ_RUNNING;
 854                         if (running)
 855                                 rq_state |= RQ_STOP;
 856                         spin_unlock(&config_list_lock);
 857                         if (running) {
 858                                 wake_up(&rq_waitq);
 859                                 wait_for_completion(&rq_exit);
 860                         }
 861                 }
 862                 obd_cleanup_client_import(obd);
 863                 rc = mgc_llog_fini(NULL, obd);
 864                 if (rc != 0)
 865                         CERROR("failed to cleanup llogging subsystems\n");
 866                 break;
 867         }
 868         RETURN(rc);
 869 }
 870
 871 static int mgc_cleanup(struct obd_device *obd)
 872 {
 873         int rc;
 874         ENTRY;
 875
 876         /* COMPAT_146 - old config logs may have added profiles we don't
 877            know about */
 878         if (obd->obd_type->typ_refcnt <= 1)
 879                 /* Only for the last mgc */
 880                 class_del_profiles();
 881
 882         lprocfs_obd_cleanup(obd);
 883         ptlrpcd_decref();
 884
 885         rc = client_obd_cleanup(obd);
 886         RETURN(rc);
 887 }
 888
 889 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 890 {
 891         struct lprocfs_static_vars lvars;
 892         int rc;
 893         ENTRY;
 894
 895         ptlrpcd_addref();
 896
 897         rc = client_obd_setup(obd, lcfg);
 898         if (rc)
 899                 GOTO(err_decref, rc);
 900
 901         rc = mgc_llog_init(NULL, obd);
 902         if (rc) {
 903                 CERROR("failed to setup llogging subsystems\n");
 904                 GOTO(err_cleanup, rc);
 905         }
 906
 907         lprocfs_mgc_init_vars(&lvars);
 908         lprocfs_obd_setup(obd, lvars.obd_vars);
 909         sptlrpc_lprocfs_cliobd_attach(obd);
 910
 911         if (cfs_atomic_inc_return(&mgc_count) == 1) {
 912                 rq_state = 0;
 913                 init_waitqueue_head(&rq_waitq);
 914
 915                 /* start requeue thread */
 916                 rc = PTR_ERR(kthread_run(mgc_requeue_thread, NULL,
 917                                              "ll_cfg_requeue"));
 918                 if (IS_ERR_VALUE(rc)) {
 919                         CERROR("%s: Cannot start requeue thread (%d),"
 920                                "no more log updates!\n",
 921                                obd->obd_name, rc);
 922                         GOTO(err_cleanup, rc);
 923                 }
 924                 /* rc is the task_struct pointer of mgc_requeue_thread. */
 925                 rc = 0;
 926         }
 927
 928         RETURN(rc);
 929
 930 err_cleanup:
 931         client_obd_cleanup(obd);
 932 err_decref:
 933         ptlrpcd_decref();
 934         RETURN(rc);
 935 }
 936
 937 /* based on ll_mdc_blocking_ast */
 938 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 939                             void *data, int flag)
 940 {
 941         struct lustre_handle lockh;
 942         struct config_llog_data *cld = (struct config_llog_data *)data;
 943         int rc = 0;
 944         ENTRY;
 945
 946         switch (flag) {
 947         case LDLM_CB_BLOCKING:
 948                 /* mgs wants the lock, give it up... */
 949                 LDLM_DEBUG(lock, "MGC blocking CB");
 950                 ldlm_lock2handle(lock, &lockh);
 951                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
 952                 break;
 953         case LDLM_CB_CANCELING:
 954                 /* We've given up the lock, prepare ourselves to update. */
 955                 LDLM_DEBUG(lock, "MGC cancel CB");
 956
 957                 CDEBUG(D_MGC, "Lock res "DLDLMRES" (%.8s)\n",
 958                        PLDLMRES(lock->l_resource),
 959                        (char *)&lock->l_resource->lr_name.name[0]);
 960
 961                 if (!cld) {
 962                         CDEBUG(D_INFO, "missing data, won't requeue\n");
 963                         break;
 964                 }
 965
 966                 /* held at mgc_process_log(). */
 967                 LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
 968                 /* Are we done with this log? */
 969                 if (cld->cld_stopping) {
 970                         CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
 971                                cld->cld_logname);
 972                         config_log_put(cld);
 973                         break;
 974                 }
 975                 /* Make sure not to re-enqueue when the mgc is stopping
 976                    (we get called from client_disconnect_export) */
 977                 if (!lock->l_conn_export ||
 978                     !lock->l_conn_export->exp_obd->u.cli.cl_conn_count) {
 979                         CDEBUG(D_MGC, "log %.8s: disconnecting, won't requeue\n",
 980                                cld->cld_logname);
 981                         config_log_put(cld);
 982                         break;
 983                 }
 984
 985                 /* Re-enqueue now */
 986                 mgc_requeue_add(cld);
 987                 config_log_put(cld);
 988                 break;
 989         default:
 990                 LBUG();
 991         }
 992
 993         RETURN(rc);
 994 }
 995
 996 /* Not sure where this should go... */
 997 #define  MGC_ENQUEUE_LIMIT 50
 998 #define  MGC_TARGET_REG_LIMIT 10
 999 #define  MGC_SEND_PARAM_LIMIT 10
1000
1001 /* Send parameter to MGS*/
1002 static int mgc_set_mgs_param(struct obd_export *exp,
1003                              struct mgs_send_param *msp)
1004 {
1005         struct ptlrpc_request *req;
1006         struct mgs_send_param *req_msp, *rep_msp;
1007         int rc;
1008         ENTRY;
1009
1010         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1011                                         &RQF_MGS_SET_INFO, LUSTRE_MGS_VERSION,
1012                                         MGS_SET_INFO);
1013         if (!req)
1014                 RETURN(-ENOMEM);
1015
1016         req_msp = req_capsule_client_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
1017         if (!req_msp) {
1018                 ptlrpc_req_finished(req);
1019                 RETURN(-ENOMEM);
1020         }
1021
1022         memcpy(req_msp, msp, sizeof(*req_msp));
1023         ptlrpc_request_set_replen(req);
1024
1025         /* Limit how long we will wait for the enqueue to complete */
1026         req->rq_delay_limit = MGC_SEND_PARAM_LIMIT;
1027         rc = ptlrpc_queue_wait(req);
1028         if (!rc) {
1029                 rep_msp = req_capsule_server_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
1030                 memcpy(msp, rep_msp, sizeof(*rep_msp));
1031         }
1032
1033         ptlrpc_req_finished(req);
1034
1035         RETURN(rc);
1036 }
1037
1038 /* Take a config lock so we can get cancel notifications */
1039 static int mgc_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm,
1040                        __u32 type, ldlm_policy_data_t *policy, __u32 mode,
1041                        __u64 *flags, void *bl_cb, void *cp_cb, void *gl_cb,
1042                        void *data, __u32 lvb_len, void *lvb_swabber,
1043                        struct lustre_handle *lockh)
1044 {
1045         struct config_llog_data *cld = (struct config_llog_data *)data;
1046         struct ldlm_enqueue_info einfo = {
1047                 .ei_type        = type,
1048                 .ei_mode        = mode,
1049                 .ei_cb_bl       = mgc_blocking_ast,
1050                 .ei_cb_cp       = ldlm_completion_ast,
1051         };
1052         struct ptlrpc_request *req;
1053         int short_limit = cld_is_sptlrpc(cld);
1054         int rc;
1055         ENTRY;
1056
1057         CDEBUG(D_MGC, "Enqueue for %s (res "LPX64")\n", cld->cld_logname,
1058                cld->cld_resid.name[0]);
1059
1060         /* We need a callback for every lockholder, so don't try to
1061            ldlm_lock_match (see rev 1.1.2.11.2.47) */
1062         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1063                                         &RQF_LDLM_ENQUEUE, LUSTRE_DLM_VERSION,
1064                                         LDLM_ENQUEUE);
1065         if (req == NULL)
1066                 RETURN(-ENOMEM);
1067
1068         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, 0);
1069         ptlrpc_request_set_replen(req);
1070
1071         /* check if this is server or client */
1072         if (cld->cld_cfg.cfg_sb) {
1073                 struct lustre_sb_info *lsi = s2lsi(cld->cld_cfg.cfg_sb);
1074                 if (lsi && IS_SERVER(lsi))
1075                         short_limit = 1;
1076         }
1077         /* Limit how long we will wait for the enqueue to complete */
1078         req->rq_delay_limit = short_limit ? 5 : MGC_ENQUEUE_LIMIT;
1079         rc = ldlm_cli_enqueue(exp, &req, &einfo, &cld->cld_resid, NULL, flags,
1080                               NULL, 0, LVB_T_NONE, lockh, 0);
1081         /* A failed enqueue should still call the mgc_blocking_ast,
1082            where it will be requeued if needed ("grant failed"). */
1083         ptlrpc_req_finished(req);
1084         RETURN(rc);
1085 }
1086
1087 static int mgc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
1088                       __u32 mode, struct lustre_handle *lockh)
1089 {
1090         ENTRY;
1091
1092         ldlm_lock_decref(lockh, mode);
1093
1094         RETURN(0);
1095 }
1096
1097 static void mgc_notify_active(struct obd_device *unused)
1098 {
1099         /* wakeup mgc_requeue_thread to requeue mgc lock */
1100         spin_lock(&config_list_lock);
1101         rq_state |= RQ_NOW;
1102         spin_unlock(&config_list_lock);
1103         wake_up(&rq_waitq);
1104
1105         /* TODO: Help the MGS rebuild nidtbl. -jay */
1106 }
1107
1108 /* Send target_reg message to MGS */
1109 static int mgc_target_register(struct obd_export *exp,
1110                                struct mgs_target_info *mti)
1111 {
1112         struct ptlrpc_request  *req;
1113         struct mgs_target_info *req_mti, *rep_mti;
1114         int                     rc;
1115         ENTRY;
1116
1117         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1118                                         &RQF_MGS_TARGET_REG, LUSTRE_MGS_VERSION,
1119                                         MGS_TARGET_REG);
1120         if (req == NULL)
1121                 RETURN(-ENOMEM);
1122
1123         req_mti = req_capsule_client_get(&req->rq_pill, &RMF_MGS_TARGET_INFO);
1124         if (!req_mti) {
1125                 ptlrpc_req_finished(req);
1126                 RETURN(-ENOMEM);
1127         }
1128
1129         memcpy(req_mti, mti, sizeof(*req_mti));
1130         ptlrpc_request_set_replen(req);
1131         CDEBUG(D_MGC, "register %s\n", mti->mti_svname);
1132         /* Limit how long we will wait for the enqueue to complete */
1133         req->rq_delay_limit = MGC_TARGET_REG_LIMIT;
1134
1135         rc = ptlrpc_queue_wait(req);
1136         if (!rc) {
1137                 rep_mti = req_capsule_server_get(&req->rq_pill,
1138                                                  &RMF_MGS_TARGET_INFO);
1139                 memcpy(mti, rep_mti, sizeof(*rep_mti));
1140                 CDEBUG(D_MGC, "register %s got index = %d\n",
1141                        mti->mti_svname, mti->mti_stripe_index);
1142         }
1143         ptlrpc_req_finished(req);
1144
1145         RETURN(rc);
1146 }
1147
1148 int mgc_set_info_async(const struct lu_env *env, struct obd_export *exp,
1149                        obd_count keylen, void *key, obd_count vallen,
1150                        void *val, struct ptlrpc_request_set *set)
1151 {
1152         int rc = -EINVAL;
1153         ENTRY;
1154
1155         /* Turn off initial_recov after we try all backup servers once */
1156         if (KEY_IS(KEY_INIT_RECOV_BACKUP)) {
1157                 struct obd_import *imp = class_exp2cliimp(exp);
1158                 int value;
1159                 if (vallen != sizeof(int))
1160                         RETURN(-EINVAL);
1161                 value = *(int *)val;
1162                 CDEBUG(D_MGC, "InitRecov %s %d/d%d:i%d:r%d:or%d:%s\n",
1163                        imp->imp_obd->obd_name, value,
1164                        imp->imp_deactive, imp->imp_invalid,
1165                        imp->imp_replayable, imp->imp_obd->obd_replayable,
1166                        ptlrpc_import_state_name(imp->imp_state));
1167                 /* Resurrect if we previously died */
1168                 if ((imp->imp_state != LUSTRE_IMP_FULL &&
1169                      imp->imp_state != LUSTRE_IMP_NEW) || value > 1)
1170                         ptlrpc_reconnect_import(imp);
1171                 RETURN(0);
1172         }
1173         /* FIXME move this to mgc_process_config */
1174         if (KEY_IS(KEY_REGISTER_TARGET)) {
1175                 struct mgs_target_info *mti;
1176                 if (vallen != sizeof(struct mgs_target_info))
1177                         RETURN(-EINVAL);
1178                 mti = (struct mgs_target_info *)val;
1179                 CDEBUG(D_MGC, "register_target %s %#x\n",
1180                        mti->mti_svname, mti->mti_flags);
1181                 rc =  mgc_target_register(exp, mti);
1182                 RETURN(rc);
1183         }
1184         if (KEY_IS(KEY_SET_FS)) {
1185                 struct super_block *sb = (struct super_block *)val;
1186
1187                 if (vallen != sizeof(struct super_block))
1188                         RETURN(-EINVAL);
1189
1190                 rc = mgc_fs_setup(exp->exp_obd, sb);
1191                 RETURN(rc);
1192         }
1193         if (KEY_IS(KEY_CLEAR_FS)) {
1194                 if (vallen != 0)
1195                         RETURN(-EINVAL);
1196                 rc = mgc_fs_cleanup(exp->exp_obd);
1197                 RETURN(rc);
1198         }
1199         if (KEY_IS(KEY_SET_INFO)) {
1200                 struct mgs_send_param *msp;
1201
1202                 msp = (struct mgs_send_param *)val;
1203                 rc =  mgc_set_mgs_param(exp, msp);
1204                 RETURN(rc);
1205         }
1206         if (KEY_IS(KEY_MGSSEC)) {
1207                 struct client_obd     *cli = &exp->exp_obd->u.cli;
1208                 struct sptlrpc_flavor  flvr;
1209
1210                 /*
1211                  * empty string means using current flavor, if which haven't
1212                  * been set yet, set it as null.
1213                  *
1214                  * if flavor has been set previously, check the asking flavor
1215                  * must match the existing one.
1216                  */
1217                 if (vallen == 0) {
1218                         if (cli->cl_flvr_mgc.sf_rpc != SPTLRPC_FLVR_INVALID)
1219                                 RETURN(0);
1220                         val = "null";
1221                         vallen = 4;
1222                 }
1223
1224                 rc = sptlrpc_parse_flavor(val, &flvr);
1225                 if (rc) {
1226                         CERROR("invalid sptlrpc flavor %s to MGS\n",
1227                                (char *) val);
1228                         RETURN(rc);
1229                 }
1230
1231                 /*
1232                  * caller already hold a mutex
1233                  */
1234                 if (cli->cl_flvr_mgc.sf_rpc == SPTLRPC_FLVR_INVALID) {
1235                         cli->cl_flvr_mgc = flvr;
1236                 } else if (memcmp(&cli->cl_flvr_mgc, &flvr,
1237                                   sizeof(flvr)) != 0) {
1238                         char    str[20];
1239
1240                         sptlrpc_flavor2name(&cli->cl_flvr_mgc,
1241                                             str, sizeof(str));
1242                         LCONSOLE_ERROR("asking sptlrpc flavor %s to MGS but "
1243                                        "currently %s is in use\n",
1244                                        (char *) val, str);
1245                         rc = -EPERM;
1246                 }
1247                 RETURN(rc);
1248         }
1249
1250         RETURN(rc);
1251 }
1252
1253 static int mgc_get_info(const struct lu_env *env, struct obd_export *exp,
1254                         __u32 keylen, void *key, __u32 *vallen, void *val,
1255                         struct lov_stripe_md *unused)
1256 {
1257         int rc = -EINVAL;
1258
1259         if (KEY_IS(KEY_CONN_DATA)) {
1260                 struct obd_import *imp = class_exp2cliimp(exp);
1261                 struct obd_connect_data *data = val;
1262
1263                 if (*vallen == sizeof(*data)) {
1264                         *data = imp->imp_connect_data;
1265                         rc = 0;
1266                 }
1267         }
1268
1269         return rc;
1270 }
1271
1272 static int mgc_import_event(struct obd_device *obd,
1273                             struct obd_import *imp,
1274                             enum obd_import_event event)
1275 {
1276         int rc = 0;
1277
1278         LASSERT(imp->imp_obd == obd);
1279         CDEBUG(D_MGC, "import event %#x\n", event);
1280
1281         switch (event) {
1282         case IMP_EVENT_DISCON:
1283                 /* MGC imports should not wait for recovery */
1284                 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1285                         ptlrpc_pinger_ir_down();
1286                 break;
1287         case IMP_EVENT_INACTIVE:
1288                 break;
1289         case IMP_EVENT_INVALIDATE: {
1290                 struct ldlm_namespace *ns = obd->obd_namespace;
1291                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
1292                 break;
1293         }
1294         case IMP_EVENT_ACTIVE:
1295                 CDEBUG(D_INFO, "%s: Reactivating import\n", obd->obd_name);
1296                 /* Clearing obd_no_recov allows us to continue pinging */
1297                 obd->obd_no_recov = 0;
1298                 mgc_notify_active(obd);
1299                 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1300                         ptlrpc_pinger_ir_up();
1301                 break;
1302         case IMP_EVENT_OCD:
1303                 break;
1304         case IMP_EVENT_DEACTIVATE:
1305         case IMP_EVENT_ACTIVATE:
1306                 break;
1307         default:
1308                 CERROR("Unknown import event %#x\n", event);
1309                 LBUG();
1310         }
1311         RETURN(rc);
1312 }
1313
1314 enum {
1315         CONFIG_READ_NRPAGES_INIT = 1 << (20 - PAGE_CACHE_SHIFT),
1316         CONFIG_READ_NRPAGES      = 4
1317 };
1318
1319 static int mgc_apply_recover_logs(struct obd_device *mgc,
1320                                   struct config_llog_data *cld,
1321                                   __u64 max_version,
1322                                   void *data, int datalen, bool mne_swab)
1323 {
1324         struct config_llog_instance *cfg = &cld->cld_cfg;
1325         struct lustre_sb_info       *lsi = s2lsi(cfg->cfg_sb);
1326         struct mgs_nidtbl_entry *entry;
1327         struct lustre_cfg       *lcfg;
1328         struct lustre_cfg_bufs   bufs;
1329         u64   prev_version = 0;
1330         char *inst;
1331         char *buf;
1332         int   bufsz;
1333         int   pos;
1334         int   rc  = 0;
1335         int   off = 0;
1336         ENTRY;
1337
1338         LASSERT(cfg->cfg_instance != NULL);
1339         LASSERT(cfg->cfg_sb == cfg->cfg_instance);
1340
1341         OBD_ALLOC(inst, PAGE_CACHE_SIZE);
1342         if (inst == NULL)
1343                 RETURN(-ENOMEM);
1344
1345         if (!IS_SERVER(lsi)) {
1346                 pos = snprintf(inst, PAGE_CACHE_SIZE, "%p", cfg->cfg_instance);
1347                 if (pos >= PAGE_CACHE_SIZE) {
1348                         OBD_FREE(inst, PAGE_CACHE_SIZE);
1349                         return -E2BIG;
1350                 }
1351         } else {
1352                 LASSERT(IS_MDT(lsi));
1353                 rc = server_name2svname(lsi->lsi_svname, inst, NULL,
1354                                         PAGE_CACHE_SIZE);
1355                 if (rc) {
1356                         OBD_FREE(inst, PAGE_CACHE_SIZE);
1357                         RETURN(-EINVAL);
1358                 }
1359                 pos = strlen(inst);
1360         }
1361
1362         ++pos;
1363         buf   = inst + pos;
1364         bufsz = PAGE_CACHE_SIZE - pos;
1365
1366         while (datalen > 0) {
1367                 int   entry_len = sizeof(*entry);
1368                 int   is_ost;
1369                 struct obd_device *obd;
1370                 char *obdname;
1371                 char *cname;
1372                 char *params;
1373                 char *uuid;
1374
1375                 rc = -EINVAL;
1376                 if (datalen < sizeof(*entry))
1377                         break;
1378
1379                 entry = (typeof(entry))(data + off);
1380
1381                 /* sanity check */
1382                 if (entry->mne_nid_type != 0) /* only support type 0 for ipv4 */
1383                         break;
1384                 if (entry->mne_nid_count == 0) /* at least one nid entry */
1385                         break;
1386                 if (entry->mne_nid_size != sizeof(lnet_nid_t))
1387                         break;
1388
1389                 entry_len += entry->mne_nid_count * entry->mne_nid_size;
1390                 if (datalen < entry_len) /* must have entry_len at least */
1391                         break;
1392
1393                 /* Keep this swab for normal mixed endian handling. LU-1644 */
1394                 if (mne_swab)
1395                         lustre_swab_mgs_nidtbl_entry(entry);
1396                 if (entry->mne_length > PAGE_CACHE_SIZE) {
1397                         CERROR("MNE too large (%u)\n", entry->mne_length);
1398                         break;
1399                 }
1400
1401                 if (entry->mne_length < entry_len)
1402                         break;
1403
1404                 off     += entry->mne_length;
1405                 datalen -= entry->mne_length;
1406                 if (datalen < 0)
1407                         break;
1408
1409                 if (entry->mne_version > max_version) {
1410                         CERROR("entry index(%lld) is over max_index(%lld)\n",
1411                                entry->mne_version, max_version);
1412                         break;
1413                 }
1414
1415                 if (prev_version >= entry->mne_version) {
1416                         CERROR("index unsorted, prev %lld, now %lld\n",
1417                                prev_version, entry->mne_version);
1418                         break;
1419                 }
1420                 prev_version = entry->mne_version;
1421
1422                 /*
1423                  * Write a string with format "nid::instance" to
1424                  * lustre/<osc|mdc>/<target>-<osc|mdc>-<instance>/import.
1425                  */
1426
1427                 is_ost = entry->mne_type == LDD_F_SV_TYPE_OST;
1428                 memset(buf, 0, bufsz);
1429                 obdname = buf;
1430                 pos = 0;
1431
1432                 /* lustre-OST0001-osc-<instance #> */
1433                 strcpy(obdname, cld->cld_logname);
1434                 cname = strrchr(obdname, '-');
1435                 if (cname == NULL) {
1436                         CERROR("mgc %s: invalid logname %s\n",
1437                                mgc->obd_name, obdname);
1438                         break;
1439                 }
1440
1441                 pos = cname - obdname;
1442                 obdname[pos] = 0;
1443                 pos += sprintf(obdname + pos, "-%s%04x",
1444                                   is_ost ? "OST" : "MDT", entry->mne_index);
1445
1446                 cname = is_ost ? "osc" : "mdc",
1447                 pos += sprintf(obdname + pos, "-%s-%s", cname, inst);
1448                 lustre_cfg_bufs_reset(&bufs, obdname);
1449
1450                 /* find the obd by obdname */
1451                 obd = class_name2obd(obdname);
1452                 if (obd == NULL) {
1453                         CDEBUG(D_INFO, "mgc %s: cannot find obdname %s\n",
1454                                mgc->obd_name, obdname);
1455                         rc = 0;
1456                         /* this is a safe race, when the ost is starting up...*/
1457                         continue;
1458                 }
1459
1460                 /* osc.import = "connection=<Conn UUID>::<target instance>" */
1461                 ++pos;
1462                 params = buf + pos;
1463                 pos += sprintf(params, "%s.import=%s", cname, "connection=");
1464                 uuid = buf + pos;
1465
1466                 down_read(&obd->u.cli.cl_sem);
1467                 if (obd->u.cli.cl_import == NULL) {
1468                         /* client does not connect to the OST yet */
1469                         up_read(&obd->u.cli.cl_sem);
1470                         rc = 0;
1471                         continue;
1472                 }
1473
1474                 /* TODO: iterate all nids to find one */
1475                 /* find uuid by nid */
1476                 rc = client_import_find_conn(obd->u.cli.cl_import,
1477                                              entry->u.nids[0],
1478                                              (struct obd_uuid *)uuid);
1479                 up_read(&obd->u.cli.cl_sem);
1480                 if (rc < 0) {
1481                         CERROR("mgc: cannot find uuid by nid %s\n",
1482                                libcfs_nid2str(entry->u.nids[0]));
1483                         break;
1484                 }
1485
1486                 CDEBUG(D_INFO, "Find uuid %s by nid %s\n",
1487                        uuid, libcfs_nid2str(entry->u.nids[0]));
1488
1489                 pos += strlen(uuid);
1490                 pos += sprintf(buf + pos, "::%u", entry->mne_instance);
1491                 LASSERT(pos < bufsz);
1492
1493                 lustre_cfg_bufs_set_string(&bufs, 1, params);
1494
1495                 rc = -ENOMEM;
1496                 lcfg = lustre_cfg_new(LCFG_PARAM, &bufs);
1497                 if (lcfg == NULL) {
1498                         CERROR("mgc: cannot allocate memory\n");
1499                         break;
1500                 }
1501
1502                 CDEBUG(D_INFO, "ir apply logs "LPD64"/"LPD64" for %s -> %s\n",
1503                        prev_version, max_version, obdname, params);
1504
1505                 rc = class_process_config(lcfg);
1506                 lustre_cfg_free(lcfg);
1507                 if (rc)
1508                         CDEBUG(D_INFO, "process config for %s error %d\n",
1509                                obdname, rc);
1510
1511                 /* continue, even one with error */
1512         }
1513
1514         OBD_FREE(inst, PAGE_CACHE_SIZE);
1515         RETURN(rc);
1516 }
1517
1518 /**
1519  * This function is called if this client was notified for target restarting
1520  * by the MGS. A CONFIG_READ RPC is going to send to fetch recovery logs.
1521  */
1522 static int mgc_process_recover_log(struct obd_device *obd,
1523                                    struct config_llog_data *cld)
1524 {
1525         struct ptlrpc_request *req = NULL;
1526         struct config_llog_instance *cfg = &cld->cld_cfg;
1527         struct mgs_config_body *body;
1528         struct mgs_config_res  *res;
1529         struct ptlrpc_bulk_desc *desc;
1530         struct page **pages;
1531         int nrpages;
1532         bool eof = true;
1533         bool mne_swab = false;
1534         int i;
1535         int ealen;
1536         int rc;
1537         ENTRY;
1538
1539         /* allocate buffer for bulk transfer.
1540          * if this is the first time for this mgs to read logs,
1541          * CONFIG_READ_NRPAGES_INIT will be used since it will read all logs
1542          * once; otherwise, it only reads increment of logs, this should be
1543          * small and CONFIG_READ_NRPAGES will be used.
1544          */
1545         nrpages = CONFIG_READ_NRPAGES;
1546         if (cfg->cfg_last_idx == 0) /* the first time */
1547                 nrpages = CONFIG_READ_NRPAGES_INIT;
1548
1549         OBD_ALLOC(pages, sizeof(*pages) * nrpages);
1550         if (pages == NULL)
1551                 GOTO(out, rc = -ENOMEM);
1552
1553         for (i = 0; i < nrpages; i++) {
1554                 pages[i] = alloc_page(GFP_IOFS);
1555                 if (pages[i] == NULL)
1556                         GOTO(out, rc = -ENOMEM);
1557         }
1558
1559 again:
1560         LASSERT(cld_is_recover(cld));
1561         LASSERT(mutex_is_locked(&cld->cld_lock));
1562         req = ptlrpc_request_alloc(class_exp2cliimp(cld->cld_mgcexp),
1563                                    &RQF_MGS_CONFIG_READ);
1564         if (req == NULL)
1565                 GOTO(out, rc = -ENOMEM);
1566
1567         rc = ptlrpc_request_pack(req, LUSTRE_MGS_VERSION, MGS_CONFIG_READ);
1568         if (rc)
1569                 GOTO(out, rc);
1570
1571         /* pack request */
1572         body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
1573         LASSERT(body != NULL);
1574         LASSERT(sizeof(body->mcb_name) > strlen(cld->cld_logname));
1575         if (strlcpy(body->mcb_name, cld->cld_logname, sizeof(body->mcb_name))
1576             >= sizeof(body->mcb_name))
1577                 GOTO(out, rc = -E2BIG);
1578         body->mcb_offset = cfg->cfg_last_idx + 1;
1579         body->mcb_type   = cld->cld_type;
1580         body->mcb_bits   = PAGE_CACHE_SHIFT;
1581         body->mcb_units  = nrpages;
1582
1583         /* allocate bulk transfer descriptor */
1584         desc = ptlrpc_prep_bulk_imp(req, nrpages, 1, BULK_PUT_SINK,
1585                                     MGS_BULK_PORTAL);
1586         if (desc == NULL)
1587                 GOTO(out, rc = -ENOMEM);
1588
1589         for (i = 0; i < nrpages; i++)
1590                 ptlrpc_prep_bulk_page_pin(desc, pages[i], 0, PAGE_CACHE_SIZE);
1591
1592         ptlrpc_request_set_replen(req);
1593         rc = ptlrpc_queue_wait(req);
1594         if (rc)
1595                 GOTO(out, rc);
1596
1597         res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
1598         if (res->mcr_size < res->mcr_offset)
1599                 GOTO(out, rc = -EINVAL);
1600
1601         /* always update the index even though it might have errors with
1602          * handling the recover logs */
1603         cfg->cfg_last_idx = res->mcr_offset;
1604         eof = res->mcr_offset == res->mcr_size;
1605
1606         CDEBUG(D_INFO, "Latest version "LPD64", more %d.\n",
1607                res->mcr_offset, eof == false);
1608
1609         ealen = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, 0);
1610         if (ealen < 0)
1611                 GOTO(out, rc = ealen);
1612
1613         if (ealen > nrpages << PAGE_CACHE_SHIFT)
1614                 GOTO(out, rc = -EINVAL);
1615
1616         if (ealen == 0) { /* no logs transferred */
1617                 if (!eof)
1618                         rc = -EINVAL;
1619                 GOTO(out, rc);
1620         }
1621
1622         mne_swab = !!ptlrpc_rep_need_swab(req);
1623 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 50, 0)
1624         /* This import flag means the server did an extra swab of IR MNE
1625          * records (fixed in LU-1252), reverse it here if needed. LU-1644 */
1626         if (unlikely(req->rq_import->imp_need_mne_swab))
1627                 mne_swab = !mne_swab;
1628 #else
1629 #warning "LU-1644: Remove old OBD_CONNECT_MNE_SWAB fixup and imp_need_mne_swab"
1630 #endif
1631
1632         for (i = 0; i < nrpages && ealen > 0; i++) {
1633                 int rc2;
1634                 void *ptr;
1635
1636                 ptr = kmap(pages[i]);
1637                 rc2 = mgc_apply_recover_logs(obd, cld, res->mcr_offset, ptr,
1638                                              min_t(int, ealen, PAGE_CACHE_SIZE),
1639                                              mne_swab);
1640                 kunmap(pages[i]);
1641                 if (rc2 < 0) {
1642                         CWARN("Process recover log %s error %d\n",
1643                               cld->cld_logname, rc2);
1644                         break;
1645                 }
1646
1647                 ealen -= PAGE_CACHE_SIZE;
1648         }
1649
1650 out:
1651         if (req)
1652                 ptlrpc_req_finished(req);
1653
1654         if (rc == 0 && !eof)
1655                 goto again;
1656
1657         if (pages) {
1658                 for (i = 0; i < nrpages; i++) {
1659                         if (pages[i] == NULL)
1660                                 break;
1661                         __free_page(pages[i]);
1662                 }
1663                 OBD_FREE(pages, sizeof(*pages) * nrpages);
1664         }
1665         return rc;
1666 }
1667
1668 /* Copy a remote log locally */
1669 static int mgc_llog_local_copy(const struct lu_env *env,
1670                                struct obd_device *obd,
1671                                struct llog_ctxt *rctxt,
1672                                struct llog_ctxt *lctxt, char *logname)
1673 {
1674         char    *temp_log;
1675         int      rc;
1676
1677         ENTRY;
1678
1679         /*
1680          * - copy it to backup using llog_backup()
1681          * - copy remote llog to logname using llog_backup()
1682          * - if failed then move bakup to logname again
1683          */
1684
1685         OBD_ALLOC(temp_log, strlen(logname) + 1);
1686         if (!temp_log)
1687                 RETURN(-ENOMEM);
1688         sprintf(temp_log, "%sT", logname);
1689
1690         /* make a copy of local llog at first */
1691         rc = llog_backup(env, obd, lctxt, lctxt, logname, temp_log);
1692         if (rc < 0 && rc != -ENOENT)
1693                 GOTO(out, rc);
1694         /* copy remote llog to the local copy */
1695         rc = llog_backup(env, obd, rctxt, lctxt, logname, logname);
1696         if (rc == -ENOENT) {
1697                 /* no remote llog, delete local one too */
1698                 llog_erase(env, lctxt, NULL, logname);
1699         } else if (rc < 0) {
1700                 /* error during backup, get local one back from the copy */
1701                 llog_backup(env, obd, lctxt, lctxt, temp_log, logname);
1702 out:
1703                 CERROR("%s: failed to copy remote log %s: rc = %d\n",
1704                        obd->obd_name, logname, rc);
1705         }
1706         llog_erase(env, lctxt, NULL, temp_log);
1707         OBD_FREE(temp_log, strlen(logname) + 1);
1708         return rc;
1709 }
1710
1711 /* local_only means it cannot get remote llogs */
1712 static int mgc_process_cfg_log(struct obd_device *mgc,
1713                                struct config_llog_data *cld, int local_only)
1714 {
1715         struct llog_ctxt        *ctxt, *lctxt = NULL;
1716         struct client_obd       *cli = &mgc->u.cli;
1717         struct lustre_sb_info   *lsi = NULL;
1718         int                      rc = 0;
1719         bool                     sptlrpc_started = false;
1720         struct lu_env           *env;
1721
1722         ENTRY;
1723
1724         LASSERT(cld);
1725         LASSERT(mutex_is_locked(&cld->cld_lock));
1726
1727         /*
1728          * local copy of sptlrpc log is controlled elsewhere, don't try to
1729          * read it up here.
1730          */
1731         if (cld_is_sptlrpc(cld) && local_only)
1732                 RETURN(0);
1733
1734         if (cld->cld_cfg.cfg_sb)
1735                 lsi = s2lsi(cld->cld_cfg.cfg_sb);
1736
1737         OBD_ALLOC_PTR(env);
1738         if (env == NULL)
1739                 RETURN(-ENOMEM);
1740
1741         rc = lu_env_init(env, LCT_MG_THREAD);
1742         if (rc)
1743                 GOTO(out_free, rc);
1744
1745         ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1746         LASSERT(ctxt);
1747
1748         lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT);
1749
1750         /* Copy the setup log locally if we can. Don't mess around if we're
1751          * running an MGS though (logs are already local). */
1752         if (lctxt && lsi && IS_SERVER(lsi) && !IS_MGS(lsi) &&
1753             cli->cl_mgc_configs_dir != NULL &&
1754             lu2dt_dev(cli->cl_mgc_configs_dir->do_lu.lo_dev) ==
1755             lsi->lsi_dt_dev) {
1756                 if (!local_only)
1757                         /* Only try to copy log if we have the lock. */
1758                         rc = mgc_llog_local_copy(env, mgc, ctxt, lctxt,
1759                                                  cld->cld_logname);
1760                 if (local_only || rc) {
1761                         if (llog_is_empty(env, lctxt, cld->cld_logname)) {
1762                                 LCONSOLE_ERROR_MSG(0x13a, "Failed to get MGS "
1763                                                    "log %s and no local copy."
1764                                                    "\n", cld->cld_logname);
1765                                 GOTO(out_pop, rc = -ENOENT);
1766                         }
1767                         CDEBUG(D_MGC, "Failed to get MGS log %s, using local "
1768                                "copy for now, will try to update later.\n",
1769                                cld->cld_logname);
1770                 }
1771                 /* Now, whether we copied or not, start using the local llog.
1772                  * If we failed to copy, we'll start using whatever the old
1773                  * log has. */
1774                 llog_ctxt_put(ctxt);
1775                 ctxt = lctxt;
1776                 lctxt = NULL;
1777         } else {
1778                 if (local_only) /* no local log at client side */
1779                         GOTO(out_pop, rc = -EIO);
1780         }
1781
1782         if (cld_is_sptlrpc(cld)) {
1783                 sptlrpc_conf_log_update_begin(cld->cld_logname);
1784                 sptlrpc_started = true;
1785         }
1786
1787         /* logname and instance info should be the same, so use our
1788          * copy of the instance for the update.  The cfg_last_idx will
1789          * be updated here. */
1790         rc = class_config_parse_llog(env, ctxt, cld->cld_logname,
1791                                      &cld->cld_cfg);
1792         EXIT;
1793
1794 out_pop:
1795         __llog_ctxt_put(env, ctxt);
1796         if (lctxt)
1797                 __llog_ctxt_put(env, lctxt);
1798
1799         /*
1800          * update settings on existing OBDs. doing it inside
1801          * of llog_process_lock so no device is attaching/detaching
1802          * in parallel.
1803          * the logname must be <fsname>-sptlrpc
1804          */
1805         if (sptlrpc_started) {
1806                 LASSERT(cld_is_sptlrpc(cld));
1807                 sptlrpc_conf_log_update_end(cld->cld_logname);
1808                 class_notify_sptlrpc_conf(cld->cld_logname,
1809                                           strlen(cld->cld_logname) -
1810                                           strlen("-sptlrpc"));
1811         }
1812
1813         lu_env_fini(env);
1814 out_free:
1815         OBD_FREE_PTR(env);
1816         return rc;
1817 }
1818
1819 /** Get a config log from the MGS and process it.
1820  * This func is called for both clients and servers.
1821  * Copy the log locally before parsing it if appropriate (non-MGS server)
1822  */
1823 int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)
1824 {
1825         struct lustre_handle lockh = { 0 };
1826         __u64 flags = LDLM_FL_NO_LRU;
1827         int rc = 0, rcl;
1828         ENTRY;
1829
1830         LASSERT(cld);
1831
1832         /* I don't want multiple processes running process_log at once --
1833            sounds like badness.  It actually might be fine, as long as
1834            we're not trying to update from the same log
1835            simultaneously (in which case we should use a per-log sem.) */
1836         mutex_lock(&cld->cld_lock);
1837         if (cld->cld_stopping) {
1838                 mutex_unlock(&cld->cld_lock);
1839                 RETURN(0);
1840         }
1841
1842         OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PAUSE_PROCESS_LOG, 20);
1843
1844         CDEBUG(D_MGC, "Process log %s:%p from %d\n", cld->cld_logname,
1845                cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
1846
1847         /* Get the cfg lock on the llog */
1848         rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, NULL, LDLM_PLAIN, NULL,
1849                           LCK_CR, &flags, NULL, NULL, NULL,
1850                           cld, 0, NULL, &lockh);
1851         if (rcl == 0) {
1852                 /* Get the cld, it will be released in mgc_blocking_ast. */
1853                 config_log_get(cld);
1854                 rc = ldlm_lock_set_data(&lockh, (void *)cld);
1855                 LASSERT(rc == 0);
1856         } else {
1857                 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
1858
1859                 /* mark cld_lostlock so that it will requeue
1860                  * after MGC becomes available. */
1861                 cld->cld_lostlock = 1;
1862                 /* Get extra reference, it will be put in requeue thread */
1863                 config_log_get(cld);
1864         }
1865
1866
1867         if (cld_is_recover(cld)) {
1868                 rc = 0; /* this is not a fatal error for recover log */
1869                 if (rcl == 0)
1870                         rc = mgc_process_recover_log(mgc, cld);
1871         } else {
1872                 rc = mgc_process_cfg_log(mgc, cld, rcl != 0);
1873         }
1874
1875         CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
1876                mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
1877
1878         mutex_unlock(&cld->cld_lock);
1879
1880         /* Now drop the lock so MGS can revoke it */
1881         if (!rcl) {
1882                 rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, NULL,
1883                                  LCK_CR, &lockh);
1884                 if (rcl)
1885                         CERROR("Can't drop cfg lock: %d\n", rcl);
1886         }
1887
1888         RETURN(rc);
1889 }
1890
1891
1892 /** Called from lustre_process_log.
1893  * LCFG_LOG_START gets the config log from the MGS, processes it to start
1894  * any services, and adds it to the list logs to watch (follow).
1895  */
1896 static int mgc_process_config(struct obd_device *obd, obd_count len, void *buf)
1897 {
1898         struct lustre_cfg *lcfg = buf;
1899         struct config_llog_instance *cfg = NULL;
1900         char *logname;
1901         int rc = 0;
1902         ENTRY;
1903
1904         switch(lcfg->lcfg_command) {
1905         case LCFG_LOV_ADD_OBD: {
1906                 /* Overloading this cfg command: register a new target */
1907                 struct mgs_target_info *mti;
1908
1909                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
1910                     sizeof(struct mgs_target_info))
1911                         GOTO(out, rc = -EINVAL);
1912
1913                 mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1);
1914                 CDEBUG(D_MGC, "add_target %s %#x\n",
1915                        mti->mti_svname, mti->mti_flags);
1916                 rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti);
1917                 break;
1918         }
1919         case LCFG_LOV_DEL_OBD:
1920                 /* Unregister has no meaning at the moment. */
1921                 CERROR("lov_del_obd unimplemented\n");
1922                 rc = -ENOSYS;
1923                 break;
1924         case LCFG_SPTLRPC_CONF: {
1925                 rc = sptlrpc_process_config(lcfg);
1926                 break;
1927         }
1928         case LCFG_LOG_START: {
1929                 struct config_llog_data *cld;
1930                 struct super_block *sb;
1931
1932                 logname = lustre_cfg_string(lcfg, 1);
1933                 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
1934                 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
1935
1936                 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
1937                        cfg->cfg_last_idx);
1938
1939                 /* We're only called through here on the initial mount */
1940                 rc = config_log_add(obd, logname, cfg, sb);
1941                 if (rc)
1942                         break;
1943                 cld = config_log_find(logname, cfg);
1944                 if (cld == NULL) {
1945                         rc = -ENOENT;
1946                         break;
1947                 }
1948
1949                 /* COMPAT_146 */
1950                 /* FIXME only set this for old logs!  Right now this forces
1951                    us to always skip the "inside markers" check */
1952                 cld->cld_cfg.cfg_flags |= CFG_F_COMPAT146;
1953
1954                 rc = mgc_process_log(obd, cld);
1955                 if (rc == 0 && cld->cld_recover != NULL) {
1956                         if (OCD_HAS_FLAG(&obd->u.cli.cl_import->
1957                                          imp_connect_data, IMP_RECOV)) {
1958                                 rc = mgc_process_log(obd, cld->cld_recover);
1959                         } else {
1960                                 struct config_llog_data *cir = cld->cld_recover;
1961                                 cld->cld_recover = NULL;
1962                                 config_log_put(cir);
1963                         }
1964                         if (rc)
1965                                 CERROR("Cannot process recover llog %d\n", rc);
1966                 }
1967
1968                 if (rc == 0 && cld->cld_params != NULL) {
1969                         rc = mgc_process_log(obd, cld->cld_params);
1970                         if (rc == -ENOENT) {
1971                                 CDEBUG(D_MGC, "There is no params"
1972                                               "config file yet\n");
1973                                 rc = 0;
1974                         }
1975                         /* params log is optional */
1976                         if (rc)
1977                                 CERROR("%s: can't process params llog: rc = %d\n",
1978                                        obd->obd_name, rc);
1979                 }
1980                 config_log_put(cld);
1981
1982                 break;
1983         }
1984         case LCFG_LOG_END: {
1985                 logname = lustre_cfg_string(lcfg, 1);
1986
1987                 if (lcfg->lcfg_bufcount >= 2)
1988                         cfg = (struct config_llog_instance *)lustre_cfg_buf(
1989                                 lcfg, 2);
1990                 rc = config_log_end(logname, cfg);
1991                 break;
1992         }
1993         default: {
1994                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1995                 GOTO(out, rc = -EINVAL);
1996
1997         }
1998         }
1999 out:
2000         RETURN(rc);
2001 }
2002
2003 struct obd_ops mgc_obd_ops = {
2004         .o_owner        = THIS_MODULE,
2005         .o_setup        = mgc_setup,
2006         .o_precleanup   = mgc_precleanup,
2007         .o_cleanup      = mgc_cleanup,
2008         .o_add_conn     = client_import_add_conn,
2009         .o_del_conn     = client_import_del_conn,
2010         .o_connect      = client_connect_import,
2011         .o_disconnect   = client_disconnect_export,
2012         //.o_enqueue      = mgc_enqueue,
2013         .o_cancel       = mgc_cancel,
2014         //.o_iocontrol    = mgc_iocontrol,
2015         .o_set_info_async = mgc_set_info_async,
2016         .o_get_info       = mgc_get_info,
2017         .o_import_event = mgc_import_event,
2018         .o_process_config = mgc_process_config,
2019 };
2020
2021 int __init mgc_init(void)
2022 {
2023         return class_register_type(&mgc_obd_ops, NULL, NULL,
2024                                    LUSTRE_MGC_NAME, NULL);
2025 }
2026
2027 #ifdef __KERNEL__
2028 static void /*__exit*/ mgc_exit(void)
2029 {
2030         class_unregister_type(LUSTRE_MGC_NAME);
2031 }
2032
2033 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
2034 MODULE_DESCRIPTION("Lustre Management Client");
2035 MODULE_LICENSE("GPL");
2036
2037 module_init(mgc_init);
2038 module_exit(mgc_exit);
2039 #endif