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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/mgc/mgc_request.c
  33  *
  34  * Author: Nathan Rutman <nathan@clusterfs.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_MGC
  38 #define D_MGC D_CONFIG /*|D_WARNING*/
  39
  40 #include <linux/module.h>
  41 #include <linux/kthread.h>
  42 #include <linux/random.h>
  43
  44 #include <dt_object.h>
  45 #include <lprocfs_status.h>
  46 #include <lustre_dlm.h>
  47 #include <lustre_disk.h>
  48 #include <lustre_log.h>
  49 #include <lustre_nodemap.h>
  50 #include <lustre_swab.h>
  51 #include <obd_class.h>
  52 #include <lustre_barrier.h>
  53
  54 #include "mgc_internal.h"
  55
  56 static int mgc_name2resid(char *name, int len, struct ldlm_res_id *res_id,
  57                           int type)
  58 {
  59         __u64 resname = 0;
  60
  61         if (len > sizeof(resname)) {
  62                 CERROR("name too long: %s\n", name);
  63                 return -EINVAL;
  64         }
  65         if (len <= 0) {
  66                 CERROR("missing name: %s\n", name);
  67                 return -EINVAL;
  68         }
  69         memcpy(&resname, name, len);
  70
  71         /* Always use the same endianness for the resid */
  72         memset(res_id, 0, sizeof(*res_id));
  73         res_id->name[0] = cpu_to_le64(resname);
  74         /* XXX: unfortunately, sptlprc and config llog share one lock */
  75         switch(type) {
  76         case CONFIG_T_CONFIG:
  77         case CONFIG_T_SPTLRPC:
  78                 resname = 0;
  79                 break;
  80         case CONFIG_T_RECOVER:
  81         case CONFIG_T_PARAMS:
  82         case CONFIG_T_NODEMAP:
  83         case CONFIG_T_BARRIER:
  84                 resname = type;
  85                 break;
  86         default:
  87                 LBUG();
  88         }
  89         res_id->name[1] = cpu_to_le64(resname);
  90         CDEBUG(D_MGC, "log %s to resid %#llx/%#llx (%.8s)\n", name,
  91                res_id->name[0], res_id->name[1], (char *)&res_id->name[0]);
  92         return 0;
  93 }
  94
  95 int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type)
  96 {
  97         /* fsname is at most 8 chars long, maybe contain "-".
  98          * e.g. "lustre", "SUN-000" */
  99         return mgc_name2resid(fsname, strlen(fsname), res_id, type);
 100 }
 101 EXPORT_SYMBOL(mgc_fsname2resid);
 102
 103 int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id, int type)
 104 {
 105         char *name_end;
 106         int len;
 107
 108         /* logname consists of "fsname-nodetype".
 109          * e.g. "lustre-MDT0001", "SUN-000-client"
 110          * there is an exception: llog "params" */
 111         name_end = strrchr(logname, '-');
 112         if (!name_end)
 113                 len = strlen(logname);
 114         else
 115                 len = name_end - logname;
 116         return mgc_name2resid(logname, len, res_id, type);
 117 }
 118 EXPORT_SYMBOL(mgc_logname2resid);
 119
 120 /********************** config llog list **********************/
 121 static LIST_HEAD(config_llog_list);
 122 static DEFINE_SPINLOCK(config_list_lock);       /* protects config_llog_list */
 123
 124 /* Take a reference to a config log */
 125 static int config_log_get(struct config_llog_data *cld)
 126 {
 127         ENTRY;
 128         atomic_inc(&cld->cld_refcount);
 129         CDEBUG(D_INFO, "log %s (%p) refs %d\n", cld->cld_logname, cld,
 130                 atomic_read(&cld->cld_refcount));
 131         RETURN(0);
 132 }
 133
 134 /* Drop a reference to a config log.  When no longer referenced,
 135    we can free the config log data */
 136 static void config_log_put(struct config_llog_data *cld)
 137 {
 138         ENTRY;
 139
 140         if (unlikely(!cld))
 141                 RETURN_EXIT;
 142
 143         CDEBUG(D_INFO, "log %s(%p) refs %d\n", cld->cld_logname, cld,
 144                 atomic_read(&cld->cld_refcount));
 145         LASSERT(atomic_read(&cld->cld_refcount) > 0);
 146
 147         /* spinlock to make sure no item with 0 refcount in the list */
 148         if (atomic_dec_and_lock(&cld->cld_refcount, &config_list_lock)) {
 149                 list_del(&cld->cld_list_chain);
 150                 spin_unlock(&config_list_lock);
 151
 152                 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
 153
 154                 config_log_put(cld->cld_barrier);
 155                 config_log_put(cld->cld_recover);
 156                 config_log_put(cld->cld_params);
 157                 config_log_put(cld->cld_nodemap);
 158                 config_log_put(cld->cld_sptlrpc);
 159                 if (cld_is_sptlrpc(cld))
 160                         sptlrpc_conf_log_stop(cld->cld_logname);
 161
 162                 class_export_put(cld->cld_mgcexp);
 163                 OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1);
 164         }
 165
 166         EXIT;
 167 }
 168
 169 /* Find a config log by name */
 170 static
 171 struct config_llog_data *config_log_find(char *logname,
 172                                          struct config_llog_instance *cfg)
 173 {
 174         struct config_llog_data *cld;
 175         struct config_llog_data *found = NULL;
 176         unsigned long cfg_instance;
 177
 178         ENTRY;
 179         LASSERT(logname != NULL);
 180
 181         cfg_instance = cfg ? cfg->cfg_instance : 0;
 182         spin_lock(&config_list_lock);
 183         list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 184                 /* check if cfg_instance is the one we want */
 185                 if (cfg_instance != cld->cld_cfg.cfg_instance)
 186                         continue;
 187
 188                 /* instance may be NULL, should check name */
 189                 if (strcmp(logname, cld->cld_logname) == 0) {
 190                         found = cld;
 191                         config_log_get(found);
 192                         break;
 193                 }
 194         }
 195         spin_unlock(&config_list_lock);
 196         RETURN(found);
 197 }
 198
 199 static
 200 struct config_llog_data *do_config_log_add(struct obd_device *obd,
 201                                            char *logname,
 202                                            int type,
 203                                            struct config_llog_instance *cfg,
 204                                            struct super_block *sb)
 205 {
 206         struct config_llog_data *cld;
 207         int rc;
 208
 209         ENTRY;
 210
 211         CDEBUG(D_MGC, "do adding config log %s-%016lx\n", logname,
 212                cfg ? cfg->cfg_instance : 0);
 213
 214         OBD_ALLOC(cld, sizeof(*cld) + strlen(logname) + 1);
 215         if (!cld)
 216                 RETURN(ERR_PTR(-ENOMEM));
 217
 218         rc = mgc_logname2resid(logname, &cld->cld_resid, type);
 219         if (rc) {
 220                 OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1);
 221                 RETURN(ERR_PTR(rc));
 222         }
 223
 224         strcpy(cld->cld_logname, logname);
 225         if (cfg)
 226                 cld->cld_cfg = *cfg;
 227         else
 228                 cld->cld_cfg.cfg_callback = class_config_llog_handler;
 229         mutex_init(&cld->cld_lock);
 230         cld->cld_cfg.cfg_last_idx = 0;
 231         cld->cld_cfg.cfg_flags = 0;
 232         cld->cld_cfg.cfg_sb = sb;
 233         cld->cld_type = type;
 234         atomic_set(&cld->cld_refcount, 1);
 235
 236         /* Keep the mgc around until we are done */
 237         cld->cld_mgcexp = class_export_get(obd->obd_self_export);
 238
 239         if (cld_is_sptlrpc(cld))
 240                 sptlrpc_conf_log_start(logname);
 241
 242         spin_lock(&config_list_lock);
 243         list_add(&cld->cld_list_chain, &config_llog_list);
 244         spin_unlock(&config_list_lock);
 245
 246         if (cld_is_sptlrpc(cld) || cld_is_nodemap(cld) || cld_is_barrier(cld)) {
 247                 rc = mgc_process_log(obd, cld);
 248                 if (rc && rc != -ENOENT)
 249                         CERROR("%s: failed processing log, type %d: rc = %d\n",
 250                                obd->obd_name, type, rc);
 251         }
 252
 253         RETURN(cld);
 254 }
 255
 256 static struct config_llog_data *config_recover_log_add(struct obd_device *obd,
 257                                         char *fsname,
 258                                         struct config_llog_instance *cfg,
 259                                         struct super_block *sb)
 260 {
 261         struct config_llog_instance lcfg = *cfg;
 262         struct lustre_sb_info *lsi = s2lsi(sb);
 263         struct config_llog_data *cld;
 264         char logname[32];
 265
 266         if (IS_OST(lsi))
 267                 return NULL;
 268
 269         /* for osp-on-ost, see lustre_start_osp() */
 270         if (IS_MDT(lsi) && lcfg.cfg_instance)
 271                 return NULL;
 272
 273         /* We have to use different llog for clients and MDTs for DNE,
 274          * where only clients are notified if one of DNE server restarts.
 275          */
 276         LASSERT(strlen(fsname) < sizeof(logname) / 2);
 277         strncpy(logname, fsname, sizeof(logname));
 278         if (IS_SERVER(lsi)) { /* mdt */
 279                 LASSERT(lcfg.cfg_instance == 0);
 280                 lcfg.cfg_instance = ll_get_cfg_instance(sb);
 281                 strncat(logname, "-mdtir", sizeof(logname));
 282         } else {
 283                 LASSERT(lcfg.cfg_instance != 0);
 284                 strncat(logname, "-cliir", sizeof(logname));
 285         }
 286
 287         cld = do_config_log_add(obd, logname, CONFIG_T_RECOVER, &lcfg, sb);
 288         return cld;
 289 }
 290
 291 static struct config_llog_data *config_log_find_or_add(struct obd_device *obd,
 292                                 char *logname, struct super_block *sb, int type,
 293                                 struct config_llog_instance *cfg)
 294 {
 295         struct config_llog_instance lcfg = *cfg;
 296         struct config_llog_data *cld;
 297
 298         /* Note class_config_llog_handler() depends on getting "obd" back */
 299         lcfg.cfg_instance = sb ? ll_get_cfg_instance(sb) : (unsigned long)obd;
 300
 301         cld = config_log_find(logname, &lcfg);
 302         if (unlikely(cld != NULL))
 303                 return cld;
 304
 305         return do_config_log_add(obd, logname, type, &lcfg, sb);
 306 }
 307
 308 /** Add this log to the list of active logs watched by an MGC.
 309  * Active means we're watching for updates.
 310  * We have one active log per "mount" - client instance or servername.
 311  * Each instance may be at a different point in the log.
 312  */
 313 static struct config_llog_data *
 314 config_log_add(struct obd_device *obd, char *logname,
 315                struct config_llog_instance *cfg, struct super_block *sb)
 316 {
 317         struct lustre_sb_info *lsi = s2lsi(sb);
 318         struct config_llog_data *cld = NULL;
 319         struct config_llog_data *sptlrpc_cld = NULL;
 320         struct config_llog_data *params_cld = NULL;
 321         struct config_llog_data *nodemap_cld = NULL;
 322         struct config_llog_data *barrier_cld = NULL;
 323         char seclogname[32];
 324         char *ptr;
 325         int rc;
 326         bool locked = false;
 327         ENTRY;
 328
 329         CDEBUG(D_MGC, "add config log %s-%016lx\n", logname,
 330                cfg->cfg_instance);
 331
 332         /*
 333          * for each regular log, the depended sptlrpc log name is
 334          * <fsname>-sptlrpc. multiple regular logs may share one sptlrpc log.
 335          */
 336         ptr = strrchr(logname, '-');
 337         if (ptr == NULL || ptr - logname > 8) {
 338                 CERROR("logname %s is too long\n", logname);
 339                 RETURN(ERR_PTR(-EINVAL));
 340         }
 341
 342         memcpy(seclogname, logname, ptr - logname);
 343         strcpy(seclogname + (ptr - logname), "-sptlrpc");
 344
 345         if (cfg->cfg_sub_clds & CONFIG_SUB_SPTLRPC) {
 346                 sptlrpc_cld = config_log_find_or_add(obd, seclogname, NULL,
 347                                                      CONFIG_T_SPTLRPC, cfg);
 348                 if (IS_ERR(sptlrpc_cld)) {
 349                         CERROR("%s: can't create sptlrpc log %s: rc = %ld\n",
 350                                obd->obd_name, seclogname, PTR_ERR(sptlrpc_cld));
 351                         RETURN(sptlrpc_cld);
 352                 }
 353         }
 354
 355         if (!IS_MGS(lsi) && cfg->cfg_sub_clds & CONFIG_SUB_NODEMAP) {
 356                 nodemap_cld = config_log_find_or_add(obd, LUSTRE_NODEMAP_NAME,
 357                                                      NULL, CONFIG_T_NODEMAP,
 358                                                      cfg);
 359                 if (IS_ERR(nodemap_cld)) {
 360                         rc = PTR_ERR(nodemap_cld);
 361                         CERROR("%s: cannot create nodemap log: rc = %d\n",
 362                                obd->obd_name, rc);
 363                         GOTO(out_sptlrpc, rc);
 364                 }
 365         }
 366
 367         if (cfg->cfg_sub_clds & CONFIG_SUB_PARAMS) {
 368                 params_cld = config_log_find_or_add(obd, PARAMS_FILENAME, sb,
 369                                                     CONFIG_T_PARAMS, cfg);
 370                 if (IS_ERR(params_cld)) {
 371                         rc = PTR_ERR(params_cld);
 372                         CERROR("%s: can't create params log: rc = %d\n",
 373                                obd->obd_name, rc);
 374                         GOTO(out_nodemap, rc);
 375                 }
 376         }
 377
 378         if (IS_MDT(s2lsi(sb)) && cfg->cfg_sub_clds & CONFIG_SUB_BARRIER) {
 379                 snprintf(seclogname + (ptr - logname), sizeof(seclogname) - 1,
 380                          "-%s", BARRIER_FILENAME);
 381                 barrier_cld = config_log_find_or_add(obd, seclogname, sb,
 382                                                      CONFIG_T_BARRIER, cfg);
 383                 if (IS_ERR(barrier_cld)) {
 384                         rc = PTR_ERR(barrier_cld);
 385                         CERROR("%s: can't create barrier log: rc = %d\n",
 386                                obd->obd_name, rc);
 387                         GOTO(out_params, rc);
 388                 }
 389         }
 390
 391         cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb);
 392         if (IS_ERR(cld)) {
 393                 rc = PTR_ERR(cld);
 394                 CERROR("%s: can't create log: rc = %d\n",
 395                        obd->obd_name, rc);
 396                 GOTO(out_barrier, rc = PTR_ERR(cld));
 397         }
 398
 399         LASSERT(lsi->lsi_lmd);
 400         if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR) &&
 401             cfg->cfg_sub_clds & CONFIG_SUB_RECOVER) {
 402                 struct config_llog_data *recover_cld;
 403
 404                 ptr = strrchr(seclogname, '-');
 405                 if (ptr != NULL) {
 406                         *ptr = 0;
 407                 } else {
 408                         CERROR("%s: sptlrpc log name not correct, %s: "
 409                                "rc = %d\n", obd->obd_name, seclogname, -EINVAL);
 410                         GOTO(out_cld, rc = -EINVAL);
 411                 }
 412
 413                 recover_cld = config_recover_log_add(obd, seclogname, cfg, sb);
 414                 if (IS_ERR(recover_cld)) {
 415                         rc = PTR_ERR(recover_cld);
 416                         CERROR("%s: can't create recover log: rc = %d\n",
 417                                obd->obd_name, rc);
 418                         GOTO(out_cld, rc);
 419                 }
 420
 421                 mutex_lock(&cld->cld_lock);
 422                 locked = true;
 423                 cld->cld_recover = recover_cld;
 424         }
 425
 426         if (!locked)
 427                 mutex_lock(&cld->cld_lock);
 428         cld->cld_params = params_cld;
 429         cld->cld_barrier = barrier_cld;
 430         cld->cld_nodemap = nodemap_cld;
 431         cld->cld_sptlrpc = sptlrpc_cld;
 432         mutex_unlock(&cld->cld_lock);
 433
 434         RETURN(cld);
 435
 436 out_cld:
 437         config_log_put(cld);
 438 out_barrier:
 439         config_log_put(barrier_cld);
 440 out_params:
 441         config_log_put(params_cld);
 442 out_nodemap:
 443         config_log_put(nodemap_cld);
 444 out_sptlrpc:
 445         config_log_put(sptlrpc_cld);
 446
 447         return ERR_PTR(rc);
 448 }
 449
 450 DEFINE_MUTEX(llog_process_lock);
 451
 452 static inline void config_mark_cld_stop_nolock(struct config_llog_data *cld)
 453 {
 454         ENTRY;
 455
 456         spin_lock(&config_list_lock);
 457         cld->cld_stopping = 1;
 458         spin_unlock(&config_list_lock);
 459
 460         CDEBUG(D_INFO, "lockh %#llx\n", cld->cld_lockh.cookie);
 461         if (!ldlm_lock_addref_try(&cld->cld_lockh, LCK_CR))
 462                 ldlm_lock_decref_and_cancel(&cld->cld_lockh, LCK_CR);
 463 }
 464
 465 static inline void config_mark_cld_stop(struct config_llog_data *cld)
 466 {
 467         if (cld) {
 468                 mutex_lock(&cld->cld_lock);
 469                 config_mark_cld_stop_nolock(cld);
 470                 mutex_unlock(&cld->cld_lock);
 471         }
 472 }
 473
 474 /** Stop watching for updates on this log.
 475  */
 476 static int config_log_end(char *logname, struct config_llog_instance *cfg)
 477 {
 478         struct config_llog_data *cld;
 479         struct config_llog_data *cld_sptlrpc = NULL;
 480         struct config_llog_data *cld_params = NULL;
 481         struct config_llog_data *cld_recover = NULL;
 482         struct config_llog_data *cld_nodemap = NULL;
 483         struct config_llog_data *cld_barrier = NULL;
 484         int rc = 0;
 485
 486         ENTRY;
 487
 488         cld = config_log_find(logname, cfg);
 489         if (cld == NULL)
 490                 RETURN(-ENOENT);
 491
 492         mutex_lock(&cld->cld_lock);
 493         /*
 494          * if cld_stopping is set, it means we didn't start the log thus
 495          * not owning the start ref. this can happen after previous umount:
 496          * the cld still hanging there waiting for lock cancel, and we
 497          * remount again but failed in the middle and call log_end without
 498          * calling start_log.
 499          */
 500         if (unlikely(cld->cld_stopping)) {
 501                 mutex_unlock(&cld->cld_lock);
 502                 /* drop the ref from the find */
 503                 config_log_put(cld);
 504                 RETURN(rc);
 505         }
 506
 507         cld_recover = cld->cld_recover;
 508         cld->cld_recover = NULL;
 509         cld_params = cld->cld_params;
 510         cld->cld_params = NULL;
 511         cld_nodemap = cld->cld_nodemap;
 512         cld->cld_nodemap = NULL;
 513         cld_barrier = cld->cld_barrier;
 514         cld->cld_barrier = NULL;
 515         cld_sptlrpc = cld->cld_sptlrpc;
 516         cld->cld_sptlrpc = NULL;
 517
 518         config_mark_cld_stop_nolock(cld);
 519         mutex_unlock(&cld->cld_lock);
 520
 521         config_mark_cld_stop(cld_recover);
 522         config_mark_cld_stop(cld_params);
 523         config_mark_cld_stop(cld_barrier);
 524         config_mark_cld_stop(cld_sptlrpc);
 525
 526         config_log_put(cld_params);
 527         config_log_put(cld_recover);
 528         /* don't set cld_stopping on nm lock as other targets may be active */
 529         config_log_put(cld_nodemap);
 530         config_log_put(cld_barrier);
 531         config_log_put(cld_sptlrpc);
 532
 533         /* drop the ref from the find */
 534         config_log_put(cld);
 535         /* drop the start ref */
 536         config_log_put(cld);
 537
 538         CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
 539                rc);
 540         RETURN(rc);
 541 }
 542
 543 int lprocfs_mgc_rd_ir_state(struct seq_file *m, void *data)
 544 {
 545         struct obd_device       *obd = data;
 546         struct obd_import       *imp;
 547         struct obd_connect_data *ocd;
 548         struct config_llog_data *cld;
 549
 550         ENTRY;
 551         LASSERT(obd);
 552         LPROCFS_CLIMP_CHECK(obd);
 553         imp = obd->u.cli.cl_import;
 554         ocd = &imp->imp_connect_data;
 555
 556         seq_printf(m, "imperative_recovery: %s\n",
 557                    OCD_HAS_FLAG(ocd, IMP_RECOV) ? "ENABLED" : "DISABLED");
 558         seq_printf(m, "client_state:\n");
 559
 560         spin_lock(&config_list_lock);
 561         list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 562                 if (cld->cld_recover == NULL)
 563                         continue;
 564                 seq_printf(m,  "    - { client: %s, nidtbl_version: %u }\n",
 565                            cld->cld_logname,
 566                            cld->cld_recover->cld_cfg.cfg_last_idx);
 567         }
 568         spin_unlock(&config_list_lock);
 569
 570         LPROCFS_CLIMP_EXIT(obd);
 571         RETURN(0);
 572 }
 573
 574 /* reenqueue any lost locks */
 575 #define RQ_RUNNING      0x1
 576 #define RQ_NOW          0x2
 577 #define RQ_LATER        0x4
 578 #define RQ_STOP         0x8
 579 #define RQ_PRECLEANUP   0x10
 580 static int                    rq_state = 0;
 581 static wait_queue_head_t      rq_waitq;
 582 static DECLARE_COMPLETION(rq_exit);
 583 static DECLARE_COMPLETION(rq_start);
 584
 585 static void do_requeue(struct config_llog_data *cld)
 586 {
 587         int rc = 0;
 588         ENTRY;
 589
 590         LASSERT(atomic_read(&cld->cld_refcount) > 0);
 591
 592         /*
 593          * Do not run mgc_process_log on a disconnected export or an
 594          * export which is being disconnected. Take the client
 595          * semaphore to make the check non-racy.
 596          */
 597         down_read_nested(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem,
 598                          OBD_CLI_SEM_MGC);
 599         if (cld->cld_mgcexp->exp_obd->u.cli.cl_conn_count != 0) {
 600                 CDEBUG(D_MGC, "updating log %s\n", cld->cld_logname);
 601                 rc = mgc_process_log(cld->cld_mgcexp->exp_obd, cld);
 602                 if (rc && rc != -ENOENT)
 603                         CERROR("failed processing log: %d\n", rc);
 604         } else {
 605                 CDEBUG(D_MGC, "disconnecting, won't update log %s\n",
 606                        cld->cld_logname);
 607         }
 608         up_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
 609
 610         EXIT;
 611 }
 612
 613 /* this timeout represents how many seconds MGC should wait before
 614  * requeue config and recover lock to the MGS. We need to randomize this
 615  * in order to not flood the MGS.
 616  */
 617 #define MGC_TIMEOUT_MIN_SECONDS   5
 618 #define MGC_TIMEOUT_RAND_CENTISEC 500
 619
 620 static int mgc_requeue_thread(void *data)
 621 {
 622         int rc = 0;
 623         bool first = true;
 624         ENTRY;
 625
 626         CDEBUG(D_MGC, "Starting requeue thread\n");
 627
 628         /* Keep trying failed locks periodically */
 629         spin_lock(&config_list_lock);
 630         rq_state |= RQ_RUNNING;
 631         while (!(rq_state & RQ_STOP)) {
 632                 struct l_wait_info lwi;
 633                 struct config_llog_data *cld, *cld_prev;
 634                 int rand = prandom_u32_max(MGC_TIMEOUT_RAND_CENTISEC);
 635                 int to;
 636
 637                 /* Any new or requeued lostlocks will change the state */
 638                 rq_state &= ~(RQ_NOW | RQ_LATER);
 639                 spin_unlock(&config_list_lock);
 640
 641                 if (first) {
 642                         first = false;
 643                         complete(&rq_start);
 644                 }
 645
 646                 /* Always wait a few seconds to allow the server who
 647                    caused the lock revocation to finish its setup, plus some
 648                    random so everyone doesn't try to reconnect at once. */
 649                 to = cfs_time_seconds(MGC_TIMEOUT_MIN_SECONDS * 100 + rand);
 650                 /* rand is centi-seconds */
 651                 lwi = LWI_TIMEOUT(to / 100, NULL, NULL);
 652                 l_wait_event(rq_waitq, rq_state & (RQ_STOP | RQ_PRECLEANUP),
 653                              &lwi);
 654
 655                 /*
 656                  * iterate & processing through the list. for each cld, process
 657                  * its depending sptlrpc cld firstly (if any) and then itself.
 658                  *
 659                  * it's guaranteed any item in the list must have
 660                  * reference > 0; and if cld_lostlock is set, at
 661                  * least one reference is taken by the previous enqueue.
 662                  */
 663                 cld_prev = NULL;
 664
 665                 spin_lock(&config_list_lock);
 666                 rq_state &= ~RQ_PRECLEANUP;
 667                 list_for_each_entry(cld, &config_llog_list,
 668                                     cld_list_chain) {
 669                         if (!cld->cld_lostlock || cld->cld_stopping)
 670                                 continue;
 671
 672                         /* hold reference to avoid being freed during
 673                          * subsequent processing. */
 674                         config_log_get(cld);
 675                         cld->cld_lostlock = 0;
 676                         spin_unlock(&config_list_lock);
 677
 678                         config_log_put(cld_prev);
 679                         cld_prev = cld;
 680
 681                         if (likely(!(rq_state & RQ_STOP))) {
 682                                 do_requeue(cld);
 683                                 spin_lock(&config_list_lock);
 684                         } else {
 685                                 spin_lock(&config_list_lock);
 686                                 break;
 687                         }
 688                 }
 689                 spin_unlock(&config_list_lock);
 690                 config_log_put(cld_prev);
 691
 692                 /* Wait a bit to see if anyone else needs a requeue */
 693                 wait_event_idle(rq_waitq, rq_state & (RQ_NOW | RQ_STOP));
 694                 spin_lock(&config_list_lock);
 695         }
 696
 697         /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
 698         rq_state &= ~RQ_RUNNING;
 699         spin_unlock(&config_list_lock);
 700
 701         complete(&rq_exit);
 702
 703         CDEBUG(D_MGC, "Ending requeue thread\n");
 704         RETURN(rc);
 705 }
 706
 707 /* Add a cld to the list to requeue.  Start the requeue thread if needed.
 708    We are responsible for dropping the config log reference from here on out. */
 709 static void mgc_requeue_add(struct config_llog_data *cld)
 710 {
 711         bool wakeup = false;
 712         ENTRY;
 713
 714         CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n",
 715                 cld->cld_logname, atomic_read(&cld->cld_refcount),
 716                 cld->cld_stopping, rq_state);
 717         LASSERT(atomic_read(&cld->cld_refcount) > 0);
 718
 719         /* lets cancel an existent lock to mark cld as "lostlock" */
 720         CDEBUG(D_INFO, "lockh %#llx\n", cld->cld_lockh.cookie);
 721         if (!ldlm_lock_addref_try(&cld->cld_lockh, LCK_CR))
 722                 ldlm_lock_decref_and_cancel(&cld->cld_lockh, LCK_CR);
 723
 724         mutex_lock(&cld->cld_lock);
 725         spin_lock(&config_list_lock);
 726         if (!(rq_state & RQ_STOP) && !cld->cld_stopping) {
 727                 cld->cld_lostlock = 1;
 728                 rq_state |= RQ_NOW;
 729                 wakeup = true;
 730         }
 731         spin_unlock(&config_list_lock);
 732         mutex_unlock(&cld->cld_lock);
 733         if (wakeup)
 734                 wake_up(&rq_waitq);
 735
 736         EXIT;
 737 }
 738
 739 /********************** class fns **********************/
 740 static int mgc_local_llog_init(const struct lu_env *env,
 741                                struct obd_device *obd,
 742                                struct obd_device *disk)
 743 {
 744         struct llog_ctxt        *ctxt;
 745         int                      rc;
 746
 747         ENTRY;
 748
 749         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_ORIG_CTXT, disk,
 750                         &llog_osd_ops);
 751         if (rc)
 752                 RETURN(rc);
 753
 754         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
 755         LASSERT(ctxt);
 756         ctxt->loc_dir = obd->u.cli.cl_mgc_configs_dir;
 757         llog_ctxt_put(ctxt);
 758
 759         RETURN(0);
 760 }
 761
 762 static int mgc_local_llog_fini(const struct lu_env *env,
 763                                struct obd_device *obd)
 764 {
 765         struct llog_ctxt *ctxt;
 766
 767         ENTRY;
 768
 769         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
 770         llog_cleanup(env, ctxt);
 771
 772         RETURN(0);
 773 }
 774
 775 static int mgc_fs_setup(const struct lu_env *env, struct obd_device *obd,
 776                         struct super_block *sb)
 777 {
 778         struct lustre_sb_info   *lsi = s2lsi(sb);
 779         struct client_obd       *cli = &obd->u.cli;
 780         struct lu_fid            rfid, fid;
 781         struct dt_object        *root, *dto;
 782         int                      rc = 0;
 783
 784         ENTRY;
 785
 786         LASSERT(lsi);
 787         LASSERT(lsi->lsi_dt_dev);
 788
 789         /* The mgc fs exclusion mutex. Only one fs can be setup at a time. */
 790         mutex_lock(&cli->cl_mgc_mutex);
 791
 792         /* Setup the configs dir */
 793         fid.f_seq = FID_SEQ_LOCAL_NAME;
 794         fid.f_oid = 1;
 795         fid.f_ver = 0;
 796         rc = local_oid_storage_init(env, lsi->lsi_dt_dev, &fid,
 797                                     &cli->cl_mgc_los);
 798         if (rc)
 799                 RETURN(rc);
 800
 801         rc = dt_root_get(env, lsi->lsi_dt_dev, &rfid);
 802         if (rc)
 803                 GOTO(out_los, rc);
 804
 805         root = dt_locate_at(env, lsi->lsi_dt_dev, &rfid,
 806                             &cli->cl_mgc_los->los_dev->dd_lu_dev, NULL);
 807         if (unlikely(IS_ERR(root)))
 808                 GOTO(out_los, rc = PTR_ERR(root));
 809
 810         dto = local_file_find_or_create(env, cli->cl_mgc_los, root,
 811                                         MOUNT_CONFIGS_DIR,
 812                                         S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
 813         dt_object_put_nocache(env, root);
 814         if (IS_ERR(dto))
 815                 GOTO(out_los, rc = PTR_ERR(dto));
 816
 817         cli->cl_mgc_configs_dir = dto;
 818
 819         LASSERT(lsi->lsi_osd_exp->exp_obd->obd_lvfs_ctxt.dt);
 820         rc = mgc_local_llog_init(env, obd, lsi->lsi_osd_exp->exp_obd);
 821         if (rc)
 822                 GOTO(out_llog, rc);
 823
 824         /* We take an obd ref to insure that we can't get to mgc_cleanup
 825          * without calling mgc_fs_cleanup first. */
 826         class_incref(obd, "mgc_fs", obd);
 827
 828         /* We keep the cl_mgc_sem until mgc_fs_cleanup */
 829         EXIT;
 830 out_llog:
 831         if (rc) {
 832                 dt_object_put(env, cli->cl_mgc_configs_dir);
 833                 cli->cl_mgc_configs_dir = NULL;
 834         }
 835 out_los:
 836         if (rc < 0) {
 837                 local_oid_storage_fini(env, cli->cl_mgc_los);
 838                 cli->cl_mgc_los = NULL;
 839                 mutex_unlock(&cli->cl_mgc_mutex);
 840         }
 841         return rc;
 842 }
 843
 844 static int mgc_fs_cleanup(const struct lu_env *env, struct obd_device *obd)
 845 {
 846         struct client_obd       *cli = &obd->u.cli;
 847         ENTRY;
 848
 849         LASSERT(cli->cl_mgc_los != NULL);
 850
 851         mgc_local_llog_fini(env, obd);
 852
 853         dt_object_put_nocache(env, cli->cl_mgc_configs_dir);
 854         cli->cl_mgc_configs_dir = NULL;
 855
 856         local_oid_storage_fini(env, cli->cl_mgc_los);
 857         cli->cl_mgc_los = NULL;
 858
 859         class_decref(obd, "mgc_fs", obd);
 860         mutex_unlock(&cli->cl_mgc_mutex);
 861
 862         RETURN(0);
 863 }
 864
 865 static int mgc_llog_init(const struct lu_env *env, struct obd_device *obd)
 866 {
 867         struct llog_ctxt        *ctxt;
 868         int                      rc;
 869
 870         ENTRY;
 871
 872         /* setup only remote ctxt, the local disk context is switched per each
 873          * filesystem during mgc_fs_setup() */
 874         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_REPL_CTXT, obd,
 875                         &llog_client_ops);
 876         if (rc)
 877                 RETURN(rc);
 878
 879         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 880         LASSERT(ctxt);
 881
 882         llog_initiator_connect(ctxt);
 883         llog_ctxt_put(ctxt);
 884
 885         RETURN(0);
 886 }
 887
 888 static int mgc_llog_fini(const struct lu_env *env, struct obd_device *obd)
 889 {
 890         struct llog_ctxt *ctxt;
 891
 892         ENTRY;
 893
 894         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 895         if (ctxt)
 896                 llog_cleanup(env, ctxt);
 897
 898         RETURN(0);
 899 }
 900
 901
 902 static atomic_t mgc_count = ATOMIC_INIT(0);
 903 static int mgc_precleanup(struct obd_device *obd)
 904 {
 905         int     rc = 0;
 906         int     temp;
 907         ENTRY;
 908
 909         if (atomic_dec_and_test(&mgc_count)) {
 910                 LASSERT(rq_state & RQ_RUNNING);
 911                 /* stop requeue thread */
 912                 temp = RQ_STOP;
 913         } else {
 914                 /* wakeup requeue thread to clean our cld */
 915                 temp = RQ_NOW | RQ_PRECLEANUP;
 916         }
 917
 918         spin_lock(&config_list_lock);
 919         rq_state |= temp;
 920         spin_unlock(&config_list_lock);
 921         wake_up(&rq_waitq);
 922
 923         if (temp & RQ_STOP)
 924                 wait_for_completion(&rq_exit);
 925         obd_cleanup_client_import(obd);
 926
 927         rc = mgc_llog_fini(NULL, obd);
 928         if (rc != 0)
 929                 CERROR("failed to cleanup llogging subsystems\n");
 930
 931         RETURN(rc);
 932 }
 933
 934 static int mgc_cleanup(struct obd_device *obd)
 935 {
 936         int rc;
 937         ENTRY;
 938
 939         /* COMPAT_146 - old config logs may have added profiles we don't
 940            know about */
 941         if (atomic_read(&obd->obd_type->typ_refcnt) <= 1)
 942                 /* Only for the last mgc */
 943                 class_del_profiles();
 944
 945         lprocfs_obd_cleanup(obd);
 946         ptlrpcd_decref();
 947
 948         rc = client_obd_cleanup(obd);
 949         RETURN(rc);
 950 }
 951
 952 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 953 {
 954         struct task_struct      *task;
 955         int                      rc;
 956         ENTRY;
 957
 958         rc = ptlrpcd_addref();
 959         if (rc < 0)
 960                 RETURN(rc);
 961
 962         rc = client_obd_setup(obd, lcfg);
 963         if (rc)
 964                 GOTO(err_decref, rc);
 965
 966         rc = mgc_llog_init(NULL, obd);
 967         if (rc) {
 968                 CERROR("failed to setup llogging subsystems\n");
 969                 GOTO(err_cleanup, rc);
 970         }
 971
 972         rc = mgc_tunables_init(obd);
 973         if (rc)
 974                 GOTO(err_sysfs, rc);
 975
 976         if (atomic_inc_return(&mgc_count) == 1) {
 977                 rq_state = 0;
 978                 init_waitqueue_head(&rq_waitq);
 979
 980                 /* start requeue thread */
 981                 task = kthread_run(mgc_requeue_thread, NULL, "ll_cfg_requeue");
 982                 if (IS_ERR(task)) {
 983                         rc = PTR_ERR(task);
 984                         CERROR("%s: cannot start requeue thread: rc = %d; "
 985                                "no more log updates\n",
 986                                obd->obd_name, rc);
 987                         GOTO(err_sysfs, rc);
 988                 }
 989                 /* rc is the task_struct pointer of mgc_requeue_thread. */
 990                 rc = 0;
 991                 wait_for_completion(&rq_start);
 992         }
 993
 994         RETURN(rc);
 995
 996 err_sysfs:
 997         lprocfs_obd_cleanup(obd);
 998 err_cleanup:
 999         client_obd_cleanup(obd);
1000 err_decref:
1001         ptlrpcd_decref();
1002         RETURN(rc);
1003 }
1004
1005 /* based on ll_mdc_blocking_ast */
1006 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1007                             void *data, int flag)
1008 {
1009         struct lustre_handle lockh;
1010         struct config_llog_data *cld = (struct config_llog_data *)data;
1011         int rc = 0;
1012         ENTRY;
1013
1014         switch (flag) {
1015         case LDLM_CB_BLOCKING:
1016                 /* mgs wants the lock, give it up... */
1017                 LDLM_DEBUG(lock, "MGC blocking CB");
1018                 ldlm_lock2handle(lock, &lockh);
1019                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
1020                 break;
1021         case LDLM_CB_CANCELING:
1022                 /* We've given up the lock, prepare ourselves to update. */
1023                 LDLM_DEBUG(lock, "MGC cancel CB");
1024
1025                 CDEBUG(D_MGC, "Lock res "DLDLMRES" (%.8s)\n",
1026                        PLDLMRES(lock->l_resource),
1027                        (char *)&lock->l_resource->lr_name.name[0]);
1028
1029                 if (!cld) {
1030                         CDEBUG(D_INFO, "missing data, won't requeue\n");
1031                         break;
1032                 }
1033
1034                 /* held at mgc_process_log(). */
1035                 LASSERT(atomic_read(&cld->cld_refcount) > 0);
1036
1037                 lock->l_ast_data = NULL;
1038                 cld->cld_lockh.cookie = 0;
1039                 /* Are we done with this log? */
1040                 if (cld->cld_stopping) {
1041                         CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
1042                                 cld->cld_logname);
1043                         config_log_put(cld);
1044                         break;
1045                 }
1046                 /* Make sure not to re-enqueue when the mgc is stopping
1047                    (we get called from client_disconnect_export) */
1048                 if (lock->l_conn_export == NULL ||
1049                     lock->l_conn_export->exp_obd->u.cli.cl_conn_count == 0) {
1050                         CDEBUG(D_MGC, "log %.8s: disconnecting, won't requeue\n",
1051                                 cld->cld_logname);
1052                         config_log_put(cld);
1053                         break;
1054                 }
1055
1056                 /* Re-enqueue now */
1057                 mgc_requeue_add(cld);
1058                 config_log_put(cld);
1059                 break;
1060         default:
1061                 LBUG();
1062         }
1063
1064         RETURN(rc);
1065 }
1066
1067 /* Not sure where this should go... */
1068 /* This is the timeout value for MGS_CONNECT request plus a ping interval, such
1069  * that we can have a chance to try the secondary MGS if any. */
1070 #define  MGC_ENQUEUE_LIMIT (INITIAL_CONNECT_TIMEOUT + (AT_OFF ? 0 : at_min) \
1071                                 + PING_INTERVAL)
1072 #define  MGC_TARGET_REG_LIMIT 10
1073 #define  MGC_TARGET_REG_LIMIT_MAX RECONNECT_DELAY_MAX
1074 #define  MGC_SEND_PARAM_LIMIT 10
1075
1076 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 13, 53, 0)
1077 /* Send parameter to MGS*/
1078 static int mgc_set_mgs_param(struct obd_export *exp,
1079                              struct mgs_send_param *msp)
1080 {
1081         struct ptlrpc_request *req;
1082         struct mgs_send_param *req_msp, *rep_msp;
1083         int rc;
1084         ENTRY;
1085
1086         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1087                                         &RQF_MGS_SET_INFO, LUSTRE_MGS_VERSION,
1088                                         MGS_SET_INFO);
1089         if (!req)
1090                 RETURN(-ENOMEM);
1091
1092         req_msp = req_capsule_client_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
1093         if (!req_msp) {
1094                 ptlrpc_req_finished(req);
1095                 RETURN(-ENOMEM);
1096         }
1097
1098         memcpy(req_msp, msp, sizeof(*req_msp));
1099         ptlrpc_request_set_replen(req);
1100
1101         /* Limit how long we will wait for the enqueue to complete */
1102         req->rq_delay_limit = MGC_SEND_PARAM_LIMIT;
1103         rc = ptlrpc_queue_wait(req);
1104         if (!rc) {
1105                 rep_msp = req_capsule_server_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
1106                 memcpy(msp, rep_msp, sizeof(*rep_msp));
1107         }
1108
1109         ptlrpc_req_finished(req);
1110
1111         RETURN(rc);
1112 }
1113 #endif
1114
1115 /* Take a config lock so we can get cancel notifications */
1116 static int mgc_enqueue(struct obd_export *exp, enum ldlm_type type,
1117                        union ldlm_policy_data *policy, enum ldlm_mode mode,
1118                        __u64 *flags, ldlm_glimpse_callback glimpse_callback,
1119                        void *data, __u32 lvb_len, void *lvb_swabber,
1120                        struct lustre_handle *lockh)
1121 {
1122         struct config_llog_data *cld = (struct config_llog_data *)data;
1123         struct ldlm_enqueue_info einfo = {
1124                 .ei_type        = type,
1125                 .ei_mode        = mode,
1126                 .ei_cb_bl       = mgc_blocking_ast,
1127                 .ei_cb_cp       = ldlm_completion_ast,
1128                 .ei_cb_gl       = glimpse_callback,
1129         };
1130         struct ptlrpc_request *req;
1131         int short_limit = cld_is_sptlrpc(cld);
1132         int rc;
1133         ENTRY;
1134
1135         CDEBUG(D_MGC, "Enqueue for %s (res %#llx)\n", cld->cld_logname,
1136                cld->cld_resid.name[0]);
1137
1138         /* We need a callback for every lockholder, so don't try to
1139            ldlm_lock_match (see rev 1.1.2.11.2.47) */
1140         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1141                                         &RQF_LDLM_ENQUEUE, LUSTRE_DLM_VERSION,
1142                                         LDLM_ENQUEUE);
1143         if (req == NULL)
1144                 RETURN(-ENOMEM);
1145
1146         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, 0);
1147         ptlrpc_request_set_replen(req);
1148
1149         /* check if this is server or client */
1150         if (cld->cld_cfg.cfg_sb) {
1151                 struct lustre_sb_info *lsi = s2lsi(cld->cld_cfg.cfg_sb);
1152                 if (lsi && IS_SERVER(lsi))
1153                         short_limit = 1;
1154         }
1155         /* Limit how long we will wait for the enqueue to complete */
1156         req->rq_delay_limit = short_limit ? 5 : MGC_ENQUEUE_LIMIT;
1157         rc = ldlm_cli_enqueue(exp, &req, &einfo, &cld->cld_resid, NULL, flags,
1158                               NULL, 0, LVB_T_NONE, lockh, 0);
1159         /* A failed enqueue should still call the mgc_blocking_ast,
1160            where it will be requeued if needed ("grant failed"). */
1161         ptlrpc_req_finished(req);
1162         RETURN(rc);
1163 }
1164
1165 static int mgc_cancel(struct obd_export *exp, enum ldlm_mode mode,
1166                       struct lustre_handle *lockh)
1167 {
1168         ENTRY;
1169
1170         ldlm_lock_decref(lockh, mode);
1171
1172         RETURN(0);
1173 }
1174
1175 static void mgc_notify_active(struct obd_device *unused)
1176 {
1177         /* wakeup mgc_requeue_thread to requeue mgc lock */
1178         spin_lock(&config_list_lock);
1179         rq_state |= RQ_NOW;
1180         spin_unlock(&config_list_lock);
1181         wake_up(&rq_waitq);
1182
1183         /* TODO: Help the MGS rebuild nidtbl. -jay */
1184 }
1185
1186 /* Send target_reg message to MGS */
1187 static int mgc_target_register(struct obd_export *exp,
1188                                struct mgs_target_info *mti)
1189 {
1190         struct ptlrpc_request  *req;
1191         struct mgs_target_info *req_mti, *rep_mti;
1192         int                     rc;
1193         ENTRY;
1194
1195         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1196                                         &RQF_MGS_TARGET_REG, LUSTRE_MGS_VERSION,
1197                                         MGS_TARGET_REG);
1198         if (req == NULL)
1199                 RETURN(-ENOMEM);
1200
1201         req_mti = req_capsule_client_get(&req->rq_pill, &RMF_MGS_TARGET_INFO);
1202         if (!req_mti) {
1203                 ptlrpc_req_finished(req);
1204                 RETURN(-ENOMEM);
1205         }
1206
1207         memcpy(req_mti, mti, sizeof(*req_mti));
1208         ptlrpc_request_set_replen(req);
1209         CDEBUG(D_MGC, "register %s\n", mti->mti_svname);
1210         /* Limit how long we will wait for the enqueue to complete */
1211         req->rq_delay_limit = MGC_TARGET_REG_LIMIT;
1212
1213         /* if the target needs to regenerate the config log in MGS, it's better
1214          * to use some longer limit to let MGC have time to change connection to
1215          * another MGS (or try again with the same MGS) for the target (server)
1216          * will fail and exit if the request expired due to delay limit. */
1217         if (mti->mti_flags & (LDD_F_UPDATE | LDD_F_NEED_INDEX))
1218                 req->rq_delay_limit = MGC_TARGET_REG_LIMIT_MAX;
1219
1220         rc = ptlrpc_queue_wait(req);
1221         if (!rc) {
1222                 rep_mti = req_capsule_server_get(&req->rq_pill,
1223                                                  &RMF_MGS_TARGET_INFO);
1224                 memcpy(mti, rep_mti, sizeof(*rep_mti));
1225                 CDEBUG(D_MGC, "register %s got index = %d\n",
1226                        mti->mti_svname, mti->mti_stripe_index);
1227         }
1228         ptlrpc_req_finished(req);
1229
1230         RETURN(rc);
1231 }
1232
1233 static int mgc_set_info_async(const struct lu_env *env, struct obd_export *exp,
1234                               u32 keylen, void *key,
1235                               u32 vallen, void *val,
1236                               struct ptlrpc_request_set *set)
1237 {
1238         int rc = -EINVAL;
1239         ENTRY;
1240
1241         /* Turn off initial_recov after we try all backup servers once */
1242         if (KEY_IS(KEY_INIT_RECOV_BACKUP)) {
1243                 struct obd_import *imp = class_exp2cliimp(exp);
1244                 int value;
1245                 if (vallen != sizeof(int))
1246                         RETURN(-EINVAL);
1247                 value = *(int *)val;
1248                 CDEBUG(D_MGC, "InitRecov %s %d/d%d:i%d:r%d:or%d:%s\n",
1249                        imp->imp_obd->obd_name, value,
1250                        imp->imp_deactive, imp->imp_invalid,
1251                        imp->imp_replayable, imp->imp_obd->obd_replayable,
1252                        ptlrpc_import_state_name(imp->imp_state));
1253                 /* Resurrect the import immediately if
1254                  * 1. we previously got disconnected,
1255                  * 2. value > 1 (at the same node with MGS)
1256                  * */
1257                 if (imp->imp_state == LUSTRE_IMP_DISCON || value > 1)
1258                         ptlrpc_reconnect_import(imp);
1259
1260                 RETURN(0);
1261         }
1262
1263         /* FIXME move this to mgc_process_config */
1264         if (KEY_IS(KEY_REGISTER_TARGET)) {
1265                 struct mgs_target_info *mti;
1266                 if (vallen != sizeof(struct mgs_target_info))
1267                         RETURN(-EINVAL);
1268                 mti = (struct mgs_target_info *)val;
1269                 CDEBUG(D_MGC, "register_target %s %#x\n",
1270                        mti->mti_svname, mti->mti_flags);
1271                 rc =  mgc_target_register(exp, mti);
1272                 RETURN(rc);
1273         }
1274         if (KEY_IS(KEY_SET_FS)) {
1275                 struct super_block *sb = (struct super_block *)val;
1276
1277                 if (vallen != sizeof(struct super_block))
1278                         RETURN(-EINVAL);
1279
1280                 rc = mgc_fs_setup(env, exp->exp_obd, sb);
1281                 RETURN(rc);
1282         }
1283         if (KEY_IS(KEY_CLEAR_FS)) {
1284                 if (vallen != 0)
1285                         RETURN(-EINVAL);
1286                 rc = mgc_fs_cleanup(env, exp->exp_obd);
1287                 RETURN(rc);
1288         }
1289 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 13, 53, 0)
1290         if (KEY_IS(KEY_SET_INFO)) {
1291                 struct mgs_send_param *msp;
1292
1293                 msp = (struct mgs_send_param *)val;
1294                 rc =  mgc_set_mgs_param(exp, msp);
1295                 RETURN(rc);
1296         }
1297 #endif
1298         if (KEY_IS(KEY_MGSSEC)) {
1299                 struct client_obd     *cli = &exp->exp_obd->u.cli;
1300                 struct sptlrpc_flavor  flvr;
1301
1302                 /*
1303                  * empty string means using current flavor, if which haven't
1304                  * been set yet, set it as null.
1305                  *
1306                  * if flavor has been set previously, check the asking flavor
1307                  * must match the existing one.
1308                  */
1309                 if (vallen == 0) {
1310                         if (cli->cl_flvr_mgc.sf_rpc != SPTLRPC_FLVR_INVALID)
1311                                 RETURN(0);
1312                         val = "null";
1313                         vallen = 4;
1314                 }
1315
1316                 rc = sptlrpc_parse_flavor(val, &flvr);
1317                 if (rc) {
1318                         CERROR("invalid sptlrpc flavor %s to MGS\n",
1319                                (char *) val);
1320                         RETURN(rc);
1321                 }
1322
1323                 /*
1324                  * caller already hold a mutex
1325                  */
1326                 if (cli->cl_flvr_mgc.sf_rpc == SPTLRPC_FLVR_INVALID) {
1327                         cli->cl_flvr_mgc = flvr;
1328                 } else if (memcmp(&cli->cl_flvr_mgc, &flvr,
1329                                   sizeof(flvr)) != 0) {
1330                         char    str[20];
1331
1332                         sptlrpc_flavor2name(&cli->cl_flvr_mgc,
1333                                             str, sizeof(str));
1334                         LCONSOLE_ERROR("asking sptlrpc flavor %s to MGS but "
1335                                        "currently %s is in use\n",
1336                                        (char *) val, str);
1337                         rc = -EPERM;
1338                 }
1339                 RETURN(rc);
1340         }
1341
1342         RETURN(rc);
1343 }
1344
1345 static int mgc_get_info(const struct lu_env *env, struct obd_export *exp,
1346                         __u32 keylen, void *key, __u32 *vallen, void *val)
1347 {
1348         int rc = -EINVAL;
1349
1350         if (KEY_IS(KEY_CONN_DATA)) {
1351                 struct obd_import *imp = class_exp2cliimp(exp);
1352                 struct obd_connect_data *data = val;
1353
1354                 if (*vallen == sizeof(*data)) {
1355                         *data = imp->imp_connect_data;
1356                         rc = 0;
1357                 }
1358         }
1359
1360         return rc;
1361 }
1362
1363 static int mgc_import_event(struct obd_device *obd,
1364                             struct obd_import *imp,
1365                             enum obd_import_event event)
1366 {
1367         int rc = 0;
1368
1369         LASSERT(imp->imp_obd == obd);
1370         CDEBUG(D_MGC, "import event %#x\n", event);
1371
1372         switch (event) {
1373         case IMP_EVENT_DISCON:
1374                 /* MGC imports should not wait for recovery */
1375                 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1376                         ptlrpc_pinger_ir_down();
1377                 break;
1378         case IMP_EVENT_INACTIVE:
1379                 break;
1380         case IMP_EVENT_INVALIDATE: {
1381                 struct ldlm_namespace *ns = obd->obd_namespace;
1382                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
1383                 break;
1384         }
1385         case IMP_EVENT_ACTIVE:
1386                 CDEBUG(D_INFO, "%s: Reactivating import\n", obd->obd_name);
1387                 /* Clearing obd_no_recov allows us to continue pinging */
1388                 obd->obd_no_recov = 0;
1389                 mgc_notify_active(obd);
1390                 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1391                         ptlrpc_pinger_ir_up();
1392                 break;
1393         case IMP_EVENT_OCD:
1394                 break;
1395         case IMP_EVENT_DEACTIVATE:
1396         case IMP_EVENT_ACTIVATE:
1397                 break;
1398         default:
1399                 CERROR("Unknown import event %#x\n", event);
1400                 LBUG();
1401         }
1402         RETURN(rc);
1403 }
1404
1405 enum {
1406         CONFIG_READ_NRPAGES_INIT = 1 << (20 - PAGE_SHIFT),
1407         CONFIG_READ_NRPAGES      = 4
1408 };
1409
1410 static int mgc_apply_recover_logs(struct obd_device *mgc,
1411                                   struct config_llog_data *cld,
1412                                   __u64 max_version,
1413                                   void *data, int datalen, bool mne_swab)
1414 {
1415         struct config_llog_instance *cfg = &cld->cld_cfg;
1416         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1417         struct mgs_nidtbl_entry *entry;
1418         struct lustre_cfg *lcfg;
1419         struct lustre_cfg_bufs bufs;
1420         u64 prev_version = 0;
1421         char *inst;
1422         char *buf;
1423         int bufsz;
1424         int pos = 0;
1425         int rc  = 0;
1426         int off = 0;
1427
1428         ENTRY;
1429         LASSERT(cfg->cfg_instance != 0);
1430         LASSERT(ll_get_cfg_instance(cfg->cfg_sb) == cfg->cfg_instance);
1431
1432         OBD_ALLOC(inst, PAGE_SIZE);
1433         if (inst == NULL)
1434                 RETURN(-ENOMEM);
1435
1436         if (!IS_SERVER(lsi)) {
1437                 pos = snprintf(inst, PAGE_SIZE, "%016lx", cfg->cfg_instance);
1438                 if (pos >= PAGE_SIZE) {
1439                         OBD_FREE(inst, PAGE_SIZE);
1440                         return -E2BIG;
1441                 }
1442 #ifdef HAVE_SERVER_SUPPORT
1443         } else {
1444                 LASSERT(IS_MDT(lsi));
1445                 rc = server_name2svname(lsi->lsi_svname, inst, NULL,
1446                                         PAGE_SIZE);
1447                 if (rc) {
1448                         OBD_FREE(inst, PAGE_SIZE);
1449                         RETURN(-EINVAL);
1450                 }
1451                 pos = strlen(inst);
1452 #endif /* HAVE_SERVER_SUPPORT */
1453         }
1454
1455         ++pos;
1456         buf   = inst + pos;
1457         bufsz = PAGE_SIZE - pos;
1458
1459         while (datalen > 0) {
1460                 int   entry_len = sizeof(*entry);
1461                 int   is_ost, i;
1462                 struct obd_device *obd;
1463                 char *obdname;
1464                 char *cname;
1465                 char *params;
1466                 char *uuid;
1467
1468                 rc = -EINVAL;
1469                 if (datalen < sizeof(*entry))
1470                         break;
1471
1472                 entry = (typeof(entry))(data + off);
1473
1474                 /* sanity check */
1475                 if (entry->mne_nid_type != 0) /* only support type 0 for ipv4 */
1476                         break;
1477                 if (entry->mne_nid_count == 0) /* at least one nid entry */
1478                         break;
1479                 if (entry->mne_nid_size != sizeof(lnet_nid_t))
1480                         break;
1481
1482                 entry_len += entry->mne_nid_count * entry->mne_nid_size;
1483                 if (datalen < entry_len) /* must have entry_len at least */
1484                         break;
1485
1486                 /* Keep this swab for normal mixed endian handling. LU-1644 */
1487                 if (mne_swab)
1488                         lustre_swab_mgs_nidtbl_entry(entry);
1489                 if (entry->mne_length > PAGE_SIZE) {
1490                         CERROR("MNE too large (%u)\n", entry->mne_length);
1491                         break;
1492                 }
1493
1494                 if (entry->mne_length < entry_len)
1495                         break;
1496
1497                 off     += entry->mne_length;
1498                 datalen -= entry->mne_length;
1499                 if (datalen < 0)
1500                         break;
1501
1502                 if (entry->mne_version > max_version) {
1503                         CERROR("entry index(%lld) is over max_index(%lld)\n",
1504                                entry->mne_version, max_version);
1505                         break;
1506                 }
1507
1508                 if (prev_version >= entry->mne_version) {
1509                         CERROR("index unsorted, prev %lld, now %lld\n",
1510                                prev_version, entry->mne_version);
1511                         break;
1512                 }
1513                 prev_version = entry->mne_version;
1514
1515                 /*
1516                  * Write a string with format "nid::instance" to
1517                  * lustre/<osc|mdc>/<target>-<osc|mdc>-<instance>/import.
1518                  */
1519
1520                 is_ost = entry->mne_type == LDD_F_SV_TYPE_OST;
1521                 memset(buf, 0, bufsz);
1522                 obdname = buf;
1523                 pos = 0;
1524
1525                 /* lustre-OST0001-osc-<instance #> */
1526                 strcpy(obdname, cld->cld_logname);
1527                 cname = strrchr(obdname, '-');
1528                 if (cname == NULL) {
1529                         CERROR("mgc %s: invalid logname %s\n",
1530                                mgc->obd_name, obdname);
1531                         break;
1532                 }
1533
1534                 pos = cname - obdname;
1535                 obdname[pos] = 0;
1536                 pos += sprintf(obdname + pos, "-%s%04x",
1537                                   is_ost ? "OST" : "MDT", entry->mne_index);
1538
1539                 cname = is_ost ? "osc" : "mdc",
1540                 pos += sprintf(obdname + pos, "-%s-%s", cname, inst);
1541                 lustre_cfg_bufs_reset(&bufs, obdname);
1542
1543                 /* find the obd by obdname */
1544                 obd = class_name2obd(obdname);
1545                 if (obd == NULL) {
1546                         CDEBUG(D_INFO, "mgc %s: cannot find obdname %s\n",
1547                                mgc->obd_name, obdname);
1548                         rc = 0;
1549                         /* this is a safe race, when the ost is starting up...*/
1550                         continue;
1551                 }
1552
1553                 /* osc.import = "connection=<Conn UUID>::<target instance>" */
1554                 ++pos;
1555                 params = buf + pos;
1556                 pos += sprintf(params, "%s.import=%s", cname, "connection=");
1557                 uuid = buf + pos;
1558
1559                 down_read(&obd->u.cli.cl_sem);
1560                 if (obd->u.cli.cl_import == NULL) {
1561                         /* client does not connect to the OST yet */
1562                         up_read(&obd->u.cli.cl_sem);
1563                         rc = 0;
1564                         continue;
1565                 }
1566
1567                 /* iterate all nids to find one */
1568                 /* find uuid by nid */
1569                 rc = -ENOENT;
1570                 for (i = 0; i < entry->mne_nid_count; i++) {
1571                         rc = client_import_find_conn(obd->u.cli.cl_import,
1572                                                      entry->u.nids[i],
1573                                                      (struct obd_uuid *)uuid);
1574                         if (rc == 0)
1575                                 break;
1576                 }
1577
1578                 up_read(&obd->u.cli.cl_sem);
1579                 if (rc < 0) {
1580                         CERROR("mgc: cannot find uuid by nid %s\n",
1581                                libcfs_nid2str(entry->u.nids[0]));
1582                         break;
1583                 }
1584
1585                 CDEBUG(D_INFO, "Find uuid %s by nid %s\n",
1586                        uuid, libcfs_nid2str(entry->u.nids[0]));
1587
1588                 pos += strlen(uuid);
1589                 pos += sprintf(buf + pos, "::%u", entry->mne_instance);
1590                 LASSERT(pos < bufsz);
1591
1592                 lustre_cfg_bufs_set_string(&bufs, 1, params);
1593
1594                 OBD_ALLOC(lcfg, lustre_cfg_len(bufs.lcfg_bufcount,
1595                                                bufs.lcfg_buflen));
1596                 if (!lcfg) {
1597                         rc = -ENOMEM;
1598                         break;
1599                 }
1600                 lustre_cfg_init(lcfg, LCFG_PARAM, &bufs);
1601
1602                 CDEBUG(D_INFO, "ir apply logs %lld/%lld for %s -> %s\n",
1603                        prev_version, max_version, obdname, params);
1604
1605                 rc = class_process_config(lcfg);
1606                 OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount,
1607                                               lcfg->lcfg_buflens));
1608                 if (rc)
1609                         CDEBUG(D_INFO, "process config for %s error %d\n",
1610                                obdname, rc);
1611
1612                 /* continue, even one with error */
1613         }
1614
1615         OBD_FREE(inst, PAGE_SIZE);
1616         RETURN(rc);
1617 }
1618
1619 /**
1620  * This function is called if this client was notified for target restarting
1621  * by the MGS. A CONFIG_READ RPC is going to send to fetch recovery or
1622  * nodemap logs.
1623  */
1624 static int mgc_process_recover_nodemap_log(struct obd_device *obd,
1625                                            struct config_llog_data *cld)
1626 {
1627         struct ptlrpc_connection *mgc_conn;
1628         struct ptlrpc_request *req = NULL;
1629         struct config_llog_instance *cfg = &cld->cld_cfg;
1630         struct mgs_config_body *body;
1631         struct mgs_config_res *res;
1632         struct nodemap_config *new_config = NULL;
1633         struct lu_nodemap *recent_nodemap = NULL;
1634         struct ptlrpc_bulk_desc *desc;
1635         struct page **pages = NULL;
1636         __u64 config_read_offset = 0;
1637         __u8 nodemap_cur_pass = 0;
1638         int nrpages = 0;
1639         bool eof = true;
1640         bool mne_swab = false;
1641         int i;
1642         int ealen;
1643         int rc;
1644         ENTRY;
1645
1646         mgc_conn = class_exp2cliimp(cld->cld_mgcexp)->imp_connection;
1647
1648         /* don't need to get local config */
1649         if (cld_is_nodemap(cld) &&
1650             (LNET_NETTYP(LNET_NIDNET(mgc_conn->c_peer.nid)) == LOLND))
1651                 GOTO(out, rc = 0);
1652
1653         /* allocate buffer for bulk transfer.
1654          * if this is the first time for this mgs to read logs,
1655          * CONFIG_READ_NRPAGES_INIT will be used since it will read all logs
1656          * once; otherwise, it only reads increment of logs, this should be
1657          * small and CONFIG_READ_NRPAGES will be used.
1658          */
1659         nrpages = CONFIG_READ_NRPAGES;
1660         if (cfg->cfg_last_idx == 0 || cld_is_nodemap(cld))
1661                 nrpages = CONFIG_READ_NRPAGES_INIT;
1662
1663         OBD_ALLOC(pages, sizeof(*pages) * nrpages);
1664         if (pages == NULL)
1665                 GOTO(out, rc = -ENOMEM);
1666
1667         for (i = 0; i < nrpages; i++) {
1668                 pages[i] = alloc_page(GFP_KERNEL);
1669                 if (pages[i] == NULL)
1670                         GOTO(out, rc = -ENOMEM);
1671         }
1672
1673 again:
1674 #ifdef HAVE_SERVER_SUPPORT
1675         if (cld_is_nodemap(cld) && config_read_offset == 0) {
1676                 new_config = nodemap_config_alloc();
1677                 if (IS_ERR(new_config)) {
1678                         rc = PTR_ERR(new_config);
1679                         new_config = NULL;
1680                         GOTO(out, rc);
1681                 }
1682         }
1683 #endif
1684         LASSERT(cld_is_recover(cld) || cld_is_nodemap(cld));
1685         LASSERT(mutex_is_locked(&cld->cld_lock));
1686         req = ptlrpc_request_alloc(class_exp2cliimp(cld->cld_mgcexp),
1687                                    &RQF_MGS_CONFIG_READ);
1688         if (req == NULL)
1689                 GOTO(out, rc = -ENOMEM);
1690
1691         rc = ptlrpc_request_pack(req, LUSTRE_MGS_VERSION, MGS_CONFIG_READ);
1692         if (rc)
1693                 GOTO(out, rc);
1694
1695         /* pack request */
1696         body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
1697         LASSERT(body != NULL);
1698         LASSERT(sizeof(body->mcb_name) > strlen(cld->cld_logname));
1699         if (strlcpy(body->mcb_name, cld->cld_logname, sizeof(body->mcb_name))
1700             >= sizeof(body->mcb_name))
1701                 GOTO(out, rc = -E2BIG);
1702         if (cld_is_nodemap(cld))
1703                 body->mcb_offset = config_read_offset;
1704         else
1705                 body->mcb_offset = cfg->cfg_last_idx + 1;
1706         body->mcb_type   = cld->cld_type;
1707         body->mcb_bits   = PAGE_SHIFT;
1708         body->mcb_units  = nrpages;
1709         body->mcb_nm_cur_pass = nodemap_cur_pass;
1710
1711         /* allocate bulk transfer descriptor */
1712         desc = ptlrpc_prep_bulk_imp(req, nrpages, 1,
1713                                     PTLRPC_BULK_PUT_SINK | PTLRPC_BULK_BUF_KIOV,
1714                                     MGS_BULK_PORTAL,
1715                                     &ptlrpc_bulk_kiov_pin_ops);
1716         if (desc == NULL)
1717                 GOTO(out, rc = -ENOMEM);
1718
1719         for (i = 0; i < nrpages; i++)
1720                 desc->bd_frag_ops->add_kiov_frag(desc, pages[i], 0,
1721                                                  PAGE_SIZE);
1722
1723         ptlrpc_request_set_replen(req);
1724         rc = ptlrpc_queue_wait(req);
1725         if (rc)
1726                 GOTO(out, rc);
1727
1728         res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
1729         if (!res)
1730                 GOTO(out, rc = -EPROTO);
1731
1732         if (cld_is_nodemap(cld)) {
1733                 config_read_offset = res->mcr_offset;
1734                 eof = config_read_offset == II_END_OFF;
1735                 nodemap_cur_pass = res->mcr_nm_cur_pass;
1736         } else {
1737                 if (res->mcr_size < res->mcr_offset)
1738                         GOTO(out, rc = -EINVAL);
1739
1740                 /* always update the index even though it might have errors with
1741                  * handling the recover logs
1742                  */
1743                 cfg->cfg_last_idx = res->mcr_offset;
1744                 eof = res->mcr_offset == res->mcr_size;
1745
1746                 CDEBUG(D_INFO, "Latest version %lld, more %d.\n",
1747                        res->mcr_offset, eof == false);
1748         }
1749
1750         ealen = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, 0);
1751         if (ealen < 0)
1752                 GOTO(out, rc = ealen);
1753
1754         if (ealen > nrpages << PAGE_SHIFT)
1755                 GOTO(out, rc = -EINVAL);
1756
1757         if (ealen == 0) { /* no logs transferred */
1758 #ifdef HAVE_SERVER_SUPPORT
1759                 /* config changed since first read RPC */
1760                 if (cld_is_nodemap(cld) && config_read_offset == 0) {
1761                         CDEBUG(D_INFO, "nodemap config changed in transit, retrying\n");
1762                         GOTO(out, rc = -EAGAIN);
1763                 }
1764 #endif
1765                 if (!eof)
1766                         rc = -EINVAL;
1767                 GOTO(out, rc);
1768         }
1769
1770         mne_swab = ptlrpc_rep_need_swab(req);
1771
1772         /* When a nodemap config is received, we build a new nodemap config,
1773          * with new nodemap structs. We keep track of the most recently added
1774          * nodemap since the config is read ordered by nodemap_id, and so it
1775          * is likely that the next record will be related. Because access to
1776          * the nodemaps is single threaded until the nodemap_config is active,
1777          * we don't need to reference count with recent_nodemap, though
1778          * recent_nodemap should be set to NULL when the nodemap_config
1779          * is either destroyed or set active.
1780          */
1781         for (i = 0; i < nrpages && ealen > 0; i++) {
1782                 int rc2;
1783                 union lu_page   *ptr;
1784
1785                 ptr = kmap(pages[i]);
1786                 if (cld_is_nodemap(cld))
1787                         rc2 = nodemap_process_idx_pages(new_config, ptr,
1788                                                        &recent_nodemap);
1789                 else
1790                         rc2 = mgc_apply_recover_logs(obd, cld, res->mcr_offset,
1791                                                      ptr,
1792                                                      min_t(int, ealen,
1793                                                            PAGE_SIZE),
1794                                                      mne_swab);
1795                 kunmap(pages[i]);
1796                 if (rc2 < 0) {
1797                         CWARN("%s: error processing %s log %s: rc = %d\n",
1798                               obd->obd_name,
1799                               cld_is_nodemap(cld) ? "nodemap" : "recovery",
1800                               cld->cld_logname,
1801                               rc2);
1802                         GOTO(out, rc = rc2);
1803                 }
1804
1805                 ealen -= PAGE_SIZE;
1806         }
1807
1808 out:
1809         if (req) {
1810                 ptlrpc_req_finished(req);
1811                 req = NULL;
1812         }
1813
1814         if (rc == 0 && !eof)
1815                 goto again;
1816
1817 #ifdef HAVE_SERVER_SUPPORT
1818         if (new_config != NULL) {
1819                 /* recent_nodemap cannot be used after set_active/dealloc */
1820                 if (rc == 0)
1821                         nodemap_config_set_active_mgc(new_config);
1822                 else
1823                         nodemap_config_dealloc(new_config);
1824         }
1825 #endif
1826
1827         if (pages) {
1828                 for (i = 0; i < nrpages; i++) {
1829                         if (pages[i] == NULL)
1830                                 break;
1831                         __free_page(pages[i]);
1832                 }
1833                 OBD_FREE(pages, sizeof(*pages) * nrpages);
1834         }
1835         return rc;
1836 }
1837
1838 static int mgc_barrier_glimpse_ast(struct ldlm_lock *lock, void *data)
1839 {
1840         struct config_llog_data *cld = lock->l_ast_data;
1841         int rc;
1842         ENTRY;
1843
1844         if (cld->cld_stopping)
1845                 RETURN(-ENODEV);
1846
1847         rc = barrier_handler(s2lsi(cld->cld_cfg.cfg_sb)->lsi_dt_dev,
1848                              (struct ptlrpc_request *)data);
1849
1850         RETURN(rc);
1851 }
1852
1853 /* Copy a remote log locally */
1854 static int mgc_llog_local_copy(const struct lu_env *env,
1855                                struct obd_device *obd,
1856                                struct llog_ctxt *rctxt,
1857                                struct llog_ctxt *lctxt, char *logname)
1858 {
1859         char    *temp_log;
1860         int      rc;
1861
1862         ENTRY;
1863
1864         /*
1865          * - copy it to backup using llog_backup()
1866          * - copy remote llog to logname using llog_backup()
1867          * - if failed then move bakup to logname again
1868          */
1869
1870         OBD_ALLOC(temp_log, strlen(logname) + 2);
1871         if (!temp_log)
1872                 RETURN(-ENOMEM);
1873         sprintf(temp_log, "%sT", logname);
1874
1875         /* make a copy of local llog at first */
1876         rc = llog_backup(env, obd, lctxt, lctxt, logname, temp_log);
1877         if (rc < 0 && rc != -ENOENT)
1878                 GOTO(out, rc);
1879         /* copy remote llog to the local copy */
1880         rc = llog_backup(env, obd, rctxt, lctxt, logname, logname);
1881         if (rc == -ENOENT) {
1882                 /* no remote llog, delete local one too */
1883                 llog_erase(env, lctxt, NULL, logname);
1884         } else if (rc < 0) {
1885                 /* error during backup, get local one back from the copy */
1886                 llog_backup(env, obd, lctxt, lctxt, temp_log, logname);
1887 out:
1888                 CERROR("%s: failed to copy remote log %s: rc = %d\n",
1889                        obd->obd_name, logname, rc);
1890         }
1891         llog_erase(env, lctxt, NULL, temp_log);
1892         OBD_FREE(temp_log, strlen(logname) + 2);
1893         return rc;
1894 }
1895
1896 /* local_only means it cannot get remote llogs */
1897 static int mgc_process_cfg_log(struct obd_device *mgc,
1898                                struct config_llog_data *cld, int local_only)
1899 {
1900         struct llog_ctxt        *ctxt, *lctxt = NULL;
1901         struct client_obd       *cli = &mgc->u.cli;
1902         struct lustre_sb_info   *lsi = NULL;
1903         int                      rc = 0;
1904         struct lu_env           *env;
1905
1906         ENTRY;
1907
1908         LASSERT(cld);
1909         LASSERT(mutex_is_locked(&cld->cld_lock));
1910
1911         if (cld->cld_cfg.cfg_sb)
1912                 lsi = s2lsi(cld->cld_cfg.cfg_sb);
1913
1914         OBD_ALLOC_PTR(env);
1915         if (env == NULL)
1916                 RETURN(-ENOMEM);
1917
1918         rc = lu_env_init(env, LCT_MG_THREAD);
1919         if (rc)
1920                 GOTO(out_free, rc);
1921
1922         ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1923         LASSERT(ctxt);
1924
1925         lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT);
1926
1927         /* Copy the setup log locally if we can. Don't mess around if we're
1928          * running an MGS though (logs are already local). */
1929         if (lctxt && lsi && IS_SERVER(lsi) && !IS_MGS(lsi) &&
1930             cli->cl_mgc_configs_dir != NULL &&
1931             lu2dt_dev(cli->cl_mgc_configs_dir->do_lu.lo_dev) ==
1932             lsi->lsi_dt_dev) {
1933                 if (!local_only && !lsi->lsi_dt_dev->dd_rdonly)
1934                         /* Only try to copy log if we have the lock. */
1935                         rc = mgc_llog_local_copy(env, mgc, ctxt, lctxt,
1936                                                  cld->cld_logname);
1937                 if (local_only || rc) {
1938                         if (strcmp(cld->cld_logname, PARAMS_FILENAME) != 0 &&
1939                             llog_is_empty(env, lctxt, cld->cld_logname)) {
1940                                 LCONSOLE_ERROR_MSG(0x13a, "Failed to get MGS "
1941                                                    "log %s and no local copy."
1942                                                    "\n", cld->cld_logname);
1943                                 GOTO(out_pop, rc = -ENOENT);
1944                         }
1945                         CDEBUG(D_MGC, "Failed to get MGS log %s, using local "
1946                                "copy for now, will try to update later.\n",
1947                                cld->cld_logname);
1948                         rc = 0;
1949                 }
1950                 /* Now, whether we copied or not, start using the local llog.
1951                  * If we failed to copy, we'll start using whatever the old
1952                  * log has. */
1953                 llog_ctxt_put(ctxt);
1954                 ctxt = lctxt;
1955                 lctxt = NULL;
1956         } else {
1957                 if (local_only) /* no local log at client side */
1958                         GOTO(out_pop, rc = -EIO);
1959         }
1960
1961         rc = -EAGAIN;
1962         if (lsi && IS_SERVER(lsi) && !IS_MGS(lsi) &&
1963             lsi->lsi_dt_dev->dd_rdonly) {
1964                 struct llog_ctxt *rctxt;
1965
1966                 /* Under readonly mode, we may have no local copy or local
1967                  * copy is incomplete, so try to use remote llog firstly. */
1968                 rctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1969                 LASSERT(rctxt);
1970
1971                 rc = class_config_parse_llog(env, rctxt, cld->cld_logname,
1972                                              &cld->cld_cfg);
1973                 llog_ctxt_put(rctxt);
1974         }
1975
1976         if (rc && rc != -ENOENT)
1977                 rc = class_config_parse_llog(env, ctxt, cld->cld_logname,
1978                                              &cld->cld_cfg);
1979
1980         /*
1981          * update settings on existing OBDs.
1982          * the logname must be <fsname>-sptlrpc
1983          */
1984         if (rc == 0 && cld_is_sptlrpc(cld))
1985                 class_notify_sptlrpc_conf(cld->cld_logname,
1986                                           strlen(cld->cld_logname) -
1987                                           strlen("-sptlrpc"));
1988         EXIT;
1989
1990 out_pop:
1991         __llog_ctxt_put(env, ctxt);
1992         if (lctxt)
1993                 __llog_ctxt_put(env, lctxt);
1994
1995         lu_env_fini(env);
1996 out_free:
1997         OBD_FREE_PTR(env);
1998         return rc;
1999 }
2000
2001 static bool mgc_import_in_recovery(struct obd_import *imp)
2002 {
2003         bool in_recovery = true;
2004
2005         spin_lock(&imp->imp_lock);
2006         if (imp->imp_state == LUSTRE_IMP_FULL ||
2007             imp->imp_state == LUSTRE_IMP_CLOSED)
2008                 in_recovery = false;
2009         spin_unlock(&imp->imp_lock);
2010
2011         return in_recovery;
2012 }
2013
2014 /**
2015  * Get a configuration log from the MGS and process it.
2016  *
2017  * This function is called for both clients and servers to process the
2018  * configuration log from the MGS.  The MGC enqueues a DLM lock on the
2019  * log from the MGS, and if the lock gets revoked the MGC will be notified
2020  * by the lock cancellation callback that the config log has changed,
2021  * and will enqueue another MGS lock on it, and then continue processing
2022  * the new additions to the end of the log.
2023  *
2024  * Since the MGC import is not replayable, if the import is being evicted
2025  * (rcl == -ESHUTDOWN, \see ptlrpc_import_delay_req()), retry to process
2026  * the log until recovery is finished or the import is closed.
2027  *
2028  * Make a local copy of the log before parsing it if appropriate (non-MGS
2029  * server) so that the server can start even when the MGS is down.
2030  *
2031  * There shouldn't be multiple processes running process_log at once --
2032  * sounds like badness.  It actually might be fine, as long as they're not
2033  * trying to update from the same log simultaneously, in which case we
2034  * should use a per-log semaphore instead of cld_lock.
2035  *
2036  * \param[in] mgc       MGC device by which to fetch the configuration log
2037  * \param[in] cld       log processing state (stored in lock callback data)
2038  *
2039  * \retval              0 on success
2040  * \retval              negative errno on failure
2041  */
2042 int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)
2043 {
2044         struct lustre_handle lockh = { 0 };
2045         __u64 flags = LDLM_FL_NO_LRU;
2046         int rc = 0, rcl;
2047         bool retry = false;
2048         ENTRY;
2049
2050         LASSERT(cld != NULL);
2051
2052         /* I don't want multiple processes running process_log at once --
2053            sounds like badness.  It actually might be fine, as long as
2054            we're not trying to update from the same log
2055            simultaneously (in which case we should use a per-log sem.) */
2056 restart:
2057         mutex_lock(&cld->cld_lock);
2058         if (cld->cld_stopping) {
2059                 mutex_unlock(&cld->cld_lock);
2060                 RETURN(0);
2061         }
2062
2063         OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PAUSE_PROCESS_LOG, 20);
2064
2065         CDEBUG(D_MGC, "Process log %s-%016lx from %d\n", cld->cld_logname,
2066                cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
2067
2068         /* Get the cfg lock on the llog */
2069         rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, LDLM_PLAIN, NULL,
2070                           LCK_CR, &flags,
2071                           cld_is_barrier(cld) ? mgc_barrier_glimpse_ast : NULL,
2072                           cld, 0, NULL, &lockh);
2073         if (rcl == 0) {
2074                 /* Get the cld, it will be released in mgc_blocking_ast. */
2075                 config_log_get(cld);
2076                 rc = ldlm_lock_set_data(&lockh, (void *)cld);
2077                 LASSERT(!lustre_handle_is_used(&cld->cld_lockh));
2078                 LASSERT(rc == 0);
2079                 cld->cld_lockh = lockh;
2080         } else {
2081                 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
2082                 cld->cld_lockh.cookie = 0;
2083
2084                 if (rcl == -ESHUTDOWN &&
2085                     atomic_read(&mgc->u.cli.cl_mgc_refcount) > 0 && !retry) {
2086                         struct obd_import *imp;
2087                         struct l_wait_info lwi;
2088                         long timeout = cfs_time_seconds(obd_timeout);
2089
2090                         mutex_unlock(&cld->cld_lock);
2091                         imp = class_exp2cliimp(mgc->u.cli.cl_mgc_mgsexp);
2092
2093                         /* Let's force the pinger, and wait the import to be
2094                          * connected, note: since mgc import is non-replayable,
2095                          * and even the import state is disconnected, it does
2096                          * not mean the "recovery" is stopped, so we will keep
2097                          * waitting until timeout or the import state is
2098                          * FULL or closed */
2099                         ptlrpc_pinger_force(imp);
2100
2101                         lwi = LWI_TIMEOUT(timeout, NULL, NULL);
2102                         l_wait_event(imp->imp_recovery_waitq,
2103                                      !mgc_import_in_recovery(imp), &lwi);
2104
2105                         if (imp->imp_state == LUSTRE_IMP_FULL) {
2106                                 retry = true;
2107                                 goto restart;
2108                         } else {
2109                                 mutex_lock(&cld->cld_lock);
2110                                 /* unlock/lock mutex, so check stopping again */
2111                                 if (cld->cld_stopping) {
2112                                         mutex_unlock(&cld->cld_lock);
2113                                         RETURN(0);
2114                                 }
2115                                 spin_lock(&config_list_lock);
2116                                 cld->cld_lostlock = 1;
2117                                 spin_unlock(&config_list_lock);
2118                         }
2119                 } else {
2120                         /* mark cld_lostlock so that it will requeue
2121                          * after MGC becomes available. */
2122                         spin_lock(&config_list_lock);
2123                         cld->cld_lostlock = 1;
2124                         spin_unlock(&config_list_lock);
2125                 }
2126         }
2127
2128         if (cld_is_recover(cld) || cld_is_nodemap(cld)) {
2129                 if (!rcl)
2130                         rc = mgc_process_recover_nodemap_log(mgc, cld);
2131                 else if (cld_is_nodemap(cld))
2132                         rc = rcl;
2133
2134         } else if (!cld_is_barrier(cld)) {
2135                 rc = mgc_process_cfg_log(mgc, cld, rcl != 0);
2136         }
2137
2138         CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
2139                mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
2140
2141         /* Now drop the lock so MGS can revoke it */
2142         if (!rcl) {
2143                 rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, LCK_CR, &lockh);
2144                 if (rcl)
2145                         CERROR("Can't drop cfg lock: %d\n", rcl);
2146         }
2147         mutex_unlock(&cld->cld_lock);
2148
2149         /* requeue nodemap lock immediately if transfer was interrupted */
2150         if ((cld_is_nodemap(cld) && rc == -EAGAIN) ||
2151             (cld_is_recover(cld) && rc)) {
2152                 if (cld_is_recover(cld))
2153                         CWARN("%s: IR log %s failed, not fatal: rc = %d\n",
2154                               mgc->obd_name, cld->cld_logname, rc);
2155                 mgc_requeue_add(cld);
2156                 rc = 0;
2157         }
2158
2159         RETURN(rc);
2160 }
2161
2162
2163 /** Called from lustre_process_log.
2164  * LCFG_LOG_START gets the config log from the MGS, processes it to start
2165  * any services, and adds it to the list logs to watch (follow).
2166  */
2167 static int mgc_process_config(struct obd_device *obd, size_t len, void *buf)
2168 {
2169         struct lustre_cfg *lcfg = buf;
2170         struct config_llog_instance *cfg = NULL;
2171         char *logname;
2172         int rc = 0;
2173         ENTRY;
2174
2175         switch(lcfg->lcfg_command) {
2176         case LCFG_LOV_ADD_OBD: {
2177                 /* Overloading this cfg command: register a new target */
2178                 struct mgs_target_info *mti;
2179
2180                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
2181                     sizeof(struct mgs_target_info))
2182                         GOTO(out, rc = -EINVAL);
2183
2184                 mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1);
2185                 CDEBUG(D_MGC, "add_target %s %#x\n",
2186                        mti->mti_svname, mti->mti_flags);
2187                 rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti);
2188                 break;
2189         }
2190         case LCFG_LOV_DEL_OBD:
2191                 /* Unregister has no meaning at the moment. */
2192                 CERROR("lov_del_obd unimplemented\n");
2193                 rc = -ENOSYS;
2194                 break;
2195         case LCFG_SPTLRPC_CONF: {
2196                 rc = sptlrpc_process_config(lcfg);
2197                 break;
2198         }
2199         case LCFG_LOG_START: {
2200                 struct config_llog_data *cld;
2201                 struct super_block *sb;
2202
2203                 logname = lustre_cfg_string(lcfg, 1);
2204                 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
2205                 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
2206
2207                 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
2208                        cfg->cfg_last_idx);
2209
2210                 /* We're only called through here on the initial mount */
2211                 cld = config_log_add(obd, logname, cfg, sb);
2212                 if (IS_ERR(cld)) {
2213                         rc = PTR_ERR(cld);
2214                         break;
2215                 }
2216
2217                 rc = mgc_process_log(obd, cld);
2218                 if (rc == 0 && cld->cld_recover != NULL) {
2219                         if (OCD_HAS_FLAG(&obd->u.cli.cl_import->
2220                                          imp_connect_data, IMP_RECOV)) {
2221                                 rc = mgc_process_log(obd, cld->cld_recover);
2222                         } else {
2223                                 struct config_llog_data *cir;
2224
2225                                 mutex_lock(&cld->cld_lock);
2226                                 cir = cld->cld_recover;
2227                                 cld->cld_recover = NULL;
2228                                 mutex_unlock(&cld->cld_lock);
2229                                 config_log_put(cir);
2230                         }
2231
2232                         if (rc)
2233                                 CERROR("Cannot process recover llog %d\n", rc);
2234                 }
2235
2236                 if (rc == 0 && cld->cld_params != NULL) {
2237                         rc = mgc_process_log(obd, cld->cld_params);
2238                         if (rc == -ENOENT) {
2239                                 CDEBUG(D_MGC, "There is no params "
2240                                               "config file yet\n");
2241                                 rc = 0;
2242                         }
2243                         /* params log is optional */
2244                         if (rc)
2245                                 CERROR("%s: can't process params llog: rc = %d\n",
2246                                        obd->obd_name, rc);
2247                 }
2248
2249                 break;
2250         }
2251         case LCFG_LOG_END: {
2252                 logname = lustre_cfg_string(lcfg, 1);
2253
2254                 if (lcfg->lcfg_bufcount >= 2)
2255                         cfg = (struct config_llog_instance *)lustre_cfg_buf(
2256                                 lcfg, 2);
2257                 rc = config_log_end(logname, cfg);
2258                 break;
2259         }
2260         default: {
2261                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
2262                 GOTO(out, rc = -EINVAL);
2263
2264         }
2265         }
2266 out:
2267         RETURN(rc);
2268 }
2269
2270 static struct obd_ops mgc_obd_ops = {
2271         .o_owner        = THIS_MODULE,
2272         .o_setup        = mgc_setup,
2273         .o_precleanup   = mgc_precleanup,
2274         .o_cleanup      = mgc_cleanup,
2275         .o_add_conn     = client_import_add_conn,
2276         .o_del_conn     = client_import_del_conn,
2277         .o_connect      = client_connect_import,
2278         .o_disconnect   = client_disconnect_export,
2279         .o_set_info_async = mgc_set_info_async,
2280         .o_get_info       = mgc_get_info,
2281         .o_import_event = mgc_import_event,
2282         .o_process_config = mgc_process_config,
2283 };
2284
2285 static int __init mgc_init(void)
2286 {
2287         return class_register_type(&mgc_obd_ops, NULL, false, NULL,
2288                                    LUSTRE_MGC_NAME, NULL);
2289 }
2290
2291 static void __exit mgc_exit(void)
2292 {
2293         class_unregister_type(LUSTRE_MGC_NAME);
2294 }
2295
2296 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2297 MODULE_DESCRIPTION("Lustre Management Client");
2298 MODULE_VERSION(LUSTRE_VERSION_STRING);
2299 MODULE_LICENSE("GPL");
2300
2301 module_init(mgc_init);
2302 module_exit(mgc_exit);