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  *
  31  * lustre/mgc/mgc_request.c
  32  *
  33  * Author: Nathan Rutman <nathan@clusterfs.com>
  34  */
  35
  36 #define DEBUG_SUBSYSTEM S_MGC
  37 #define D_MGC D_CONFIG /*|D_WARNING*/
  38
  39 #include <linux/module.h>
  40 #include <linux/random.h>
  41
  42 #include <lprocfs_status.h>
  43 #include <lustre_dlm.h>
  44 #include <lustre_disk.h>
  45 #include <lustre_log.h>
  46 #include <lustre_swab.h>
  47 #include <obd_class.h>
  48
  49 #include "mgc_internal.h"
  50
  51 static int mgc_name2resid(char *name, int len, struct ldlm_res_id *res_id,
  52                           enum mgs_cfg_type type)
  53 {
  54         __u64 resname = 0;
  55
  56         if (len > sizeof(resname)) {
  57                 CERROR("name too long: %s\n", name);
  58                 return -EINVAL;
  59         }
  60         if (len <= 0) {
  61                 CERROR("missing name: %s\n", name);
  62                 return -EINVAL;
  63         }
  64         memcpy(&resname, name, len);
  65
  66         /* Always use the same endianness for the resid */
  67         memset(res_id, 0, sizeof(*res_id));
  68         res_id->name[0] = cpu_to_le64(resname);
  69         /* XXX: unfortunately, sptlprc and config llog share one lock */
  70         switch (type) {
  71         case MGS_CFG_T_CONFIG:
  72         case MGS_CFG_T_SPTLRPC:
  73                 resname = 0;
  74                 break;
  75         case MGS_CFG_T_RECOVER:
  76         case MGS_CFG_T_PARAMS:
  77 #ifdef HAVE_SERVER_SUPPORT
  78         case MGS_CFG_T_NODEMAP:
  79         case MGS_CFG_T_BARRIER:
  80 #endif
  81                 resname = type;
  82                 break;
  83         default:
  84                 LBUG();
  85         }
  86         res_id->name[1] = cpu_to_le64(resname);
  87         CDEBUG(D_MGC, "log %s to resid %#llx/%#llx (%.8s)\n", name,
  88                res_id->name[0], res_id->name[1], (char *)&res_id->name[0]);
  89         return 0;
  90 }
  91
  92 int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id,
  93                      enum mgs_cfg_type type)
  94 {
  95         /* fsname is at most 8 chars long, can contain "-". eg. lustre, lu-0 */
  96         return mgc_name2resid(fsname, strlen(fsname), res_id, type);
  97 }
  98 EXPORT_SYMBOL(mgc_fsname2resid);
  99
 100 int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id,
 101                       enum mgs_cfg_type type)
 102 {
 103         char *name_end;
 104         int len;
 105
 106         /* logname consists of "fsname-nodetype". eg. "lustre-MDT0001",
 107          * "SUN-000-client" there is an exception: llog "params"
 108          */
 109         name_end = strrchr(logname, '-');
 110         if (!name_end)
 111                 len = strlen(logname);
 112         else
 113                 len = name_end - logname;
 114         return mgc_name2resid(logname, len, res_id, type);
 115 }
 116 EXPORT_SYMBOL(mgc_logname2resid);
 117
 118 /********************** config llog list **********************/
 119 static LIST_HEAD(config_llog_list);
 120 static DEFINE_SPINLOCK(config_list_lock);       /* protects config_llog_list */
 121
 122 /* Take a reference to a config log */
 123 static int config_log_get(struct config_llog_data *cld)
 124 {
 125         ENTRY;
 126         refcount_inc(&cld->cld_refcount);
 127         CDEBUG(D_INFO, "log %s (%p) refs %d\n", cld->cld_logname, cld,
 128                 refcount_read(&cld->cld_refcount));
 129         RETURN(0);
 130 }
 131
 132 /* Drop a reference to a config log. When no longer referenced, We can free the
 133  * config log data
 134  */
 135 static void config_log_put(struct config_llog_data *cld)
 136 {
 137         ENTRY;
 138
 139         if (unlikely(!cld))
 140                 RETURN_EXIT;
 141
 142         CDEBUG(D_INFO, "log %s(%p) refs %d\n", cld->cld_logname, cld,
 143                 refcount_read(&cld->cld_refcount));
 144
 145         /* spinlock to make sure no item with 0 refcount in the list */
 146         if (refcount_dec_and_lock(&cld->cld_refcount, &config_list_lock)) {
 147                 list_del(&cld->cld_list_chain);
 148                 spin_unlock(&config_list_lock);
 149
 150                 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
 151 #ifdef HAVE_SERVER_SUPPORT
 152                 config_log_put(cld->cld_barrier);
 153                 config_log_put(cld->cld_nodemap);
 154 #endif
 155                 config_log_put(cld->cld_recover);
 156                 config_log_put(cld->cld_params);
 157                 config_log_put(cld->cld_sptlrpc);
 158                 if (cld_is_sptlrpc(cld)) {
 159                         cld->cld_stopping = 1;
 160                         sptlrpc_conf_log_stop(cld->cld_logname);
 161                 }
 162
 163                 class_export_put(cld->cld_mgcexp);
 164                 OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1);
 165         }
 166
 167         EXIT;
 168 }
 169
 170 /* Find a config log by name */
 171 static
 172 struct config_llog_data *config_log_find(char *logname,
 173                                          struct config_llog_instance *cfg)
 174 {
 175         struct config_llog_data *cld;
 176         struct config_llog_data *found = NULL;
 177         unsigned long cfg_instance;
 178
 179         ENTRY;
 180         LASSERT(logname != NULL);
 181
 182         cfg_instance = cfg ? cfg->cfg_instance : 0;
 183         spin_lock(&config_list_lock);
 184         list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 185                 /* check if cfg_instance is the one we want */
 186                 if (cfg_instance != cld->cld_cfg.cfg_instance)
 187                         continue;
 188
 189                 /* instance may be NULL, should check name */
 190                 if (strcmp(logname, cld->cld_logname) == 0) {
 191                         found = cld;
 192                         config_log_get(found);
 193                         break;
 194                 }
 195         }
 196         spin_unlock(&config_list_lock);
 197         RETURN(found);
 198 }
 199
 200 static
 201 struct config_llog_data *do_config_log_add(struct obd_device *obd,
 202                                            char *logname,
 203                                            enum mgs_cfg_type type,
 204                                            struct config_llog_instance *cfg,
 205                                            struct super_block *sb)
 206 {
 207         struct config_llog_data *cld;
 208         int rc;
 209         int logname_size;
 210
 211         ENTRY;
 212
 213         CDEBUG(D_MGC, "do adding config log %s-%016lx\n", logname,
 214                cfg ? cfg->cfg_instance : 0);
 215
 216         logname_size = strlen(logname) + 1;
 217         OBD_ALLOC(cld, sizeof(*cld) + logname_size);
 218         if (!cld)
 219                 RETURN(ERR_PTR(-ENOMEM));
 220
 221         rc = mgc_logname2resid(logname, &cld->cld_resid, type);
 222         if (rc) {
 223                 OBD_FREE(cld, sizeof(*cld) + logname_size);
 224                 RETURN(ERR_PTR(rc));
 225         }
 226
 227         strscpy(cld->cld_logname, logname, logname_size);
 228         if (cfg)
 229                 cld->cld_cfg = *cfg;
 230         else
 231                 cld->cld_cfg.cfg_callback = class_config_llog_handler;
 232         mutex_init(&cld->cld_lock);
 233         cld->cld_cfg.cfg_last_idx = 0;
 234         cld->cld_cfg.cfg_flags = 0;
 235         cld->cld_cfg.cfg_sb = sb;
 236         cld->cld_type = type;
 237         refcount_set(&cld->cld_refcount, 1);
 238
 239         /* Keep the mgc around until we are done */
 240         cld->cld_mgcexp = class_export_get(obd->obd_self_export);
 241
 242         if (cld_is_sptlrpc(cld))
 243                 sptlrpc_conf_log_start(logname);
 244
 245         spin_lock(&config_list_lock);
 246         list_add(&cld->cld_list_chain, &config_llog_list);
 247         spin_unlock(&config_list_lock);
 248
 249         if (cld_is_sptlrpc(cld) || cld_is_nodemap(cld) || cld_is_barrier(cld)) {
 250                 rc = mgc_process_log(obd, cld);
 251                 if (rc && rc != -ENOENT)
 252                         CERROR("%s: failed processing log, type %d: rc = %d\n",
 253                                obd->obd_name, type, rc);
 254         }
 255
 256         RETURN(cld);
 257 }
 258
 259 static struct config_llog_data *
 260 config_recover_log_add(struct obd_device *obd, char *fsname,
 261                        struct config_llog_instance *cfg,
 262                        struct super_block *sb)
 263 {
 264         struct config_llog_instance lcfg = *cfg;
 265         struct config_llog_data *cld;
 266         bool is_server = IS_SERVER(s2lsi(sb));
 267         char logname[32];
 268
 269 #ifdef HAVE_SERVER_SUPPORT
 270         if (IS_OST(s2lsi(sb)))
 271                 return NULL;
 272
 273         /* for osp-on-ost, see lustre_start_osp() */
 274         if (IS_MDT(s2lsi(sb)) && lcfg.cfg_instance)
 275                 return NULL;
 276 #endif
 277         /* We have to use different llog for clients and MDTs for DNE,
 278          * where only clients are notified if one of DNE server restarts.
 279          */
 280         LASSERT(strlen(fsname) < sizeof(logname) / 2);
 281         strncpy(logname, fsname, sizeof(logname));
 282
 283         LASSERT(is_server ? lcfg.cfg_instance == 0 : lcfg.cfg_instance != 0);
 284         if (is_server)
 285                 lcfg.cfg_instance = ll_get_cfg_instance(sb);
 286         scnprintf(logname, sizeof(logname), "%s-%s", fsname,
 287                   is_server ? "mdtir" : "cliir");
 288
 289         cld = do_config_log_add(obd, logname, MGS_CFG_T_RECOVER, &lcfg, sb);
 290         return cld;
 291 }
 292
 293 static struct config_llog_data *
 294 config_log_find_or_add(struct obd_device *obd, char *logname,
 295                        struct super_block *sb, enum mgs_cfg_type type,
 296                        struct config_llog_instance *cfg)
 297 {
 298         struct config_llog_instance lcfg = *cfg;
 299         struct config_llog_data *cld;
 300
 301         /* Note class_config_llog_handler() depends on getting "obd" back */
 302         /* for sptlrpc, sb is only provided to be able to make a local copy,
 303          * not for the instance
 304          */
 305         if (sb && type != MGS_CFG_T_SPTLRPC)
 306                 lcfg.cfg_instance = ll_get_cfg_instance(sb);
 307         else
 308                 lcfg.cfg_instance = (unsigned long)obd;
 309
 310         cld = config_log_find(logname, &lcfg);
 311         if (unlikely(cld != NULL))
 312                 return cld;
 313
 314         return do_config_log_add(obd, logname, type, &lcfg, sb);
 315 }
 316
 317 /** Add this log to the list of active logs watched by an MGC.
 318  * Active means we're watching for updates.
 319  * We have one active log per "mount" - client instance or servername.
 320  * Each instance may be at a different point in the log.
 321  */
 322 static struct config_llog_data *
 323 config_log_add(struct obd_device *obd, char *logname,
 324                struct config_llog_instance *cfg, struct super_block *sb)
 325 {
 326         struct lustre_sb_info *lsi = s2lsi(sb);
 327         struct config_llog_data *cld = NULL;
 328         struct config_llog_data *sptlrpc_cld = NULL;
 329         struct config_llog_data *params_cld = NULL;
 330 #ifdef HAVE_SERVER_SUPPORT
 331         struct config_llog_data *nodemap_cld = NULL;
 332         struct config_llog_data *barrier_cld = NULL;
 333 #endif
 334         char seclogname[32];
 335         char *ptr;
 336         int rc;
 337         bool locked = false;
 338
 339         ENTRY;
 340
 341         CDEBUG(D_MGC, "add config log %s-%016lx\n", logname,
 342                cfg->cfg_instance);
 343
 344         /*
 345          * for each regular log, the depended sptlrpc log name is
 346          * <fsname>-sptlrpc. multiple regular logs may share one sptlrpc log.
 347          */
 348         ptr = strrchr(logname, '-');
 349         if (ptr == NULL || ptr - logname > 8) {
 350                 CERROR("logname %s is too long\n", logname);
 351                 RETURN(ERR_PTR(-EINVAL));
 352         }
 353
 354         memcpy(seclogname, logname, ptr - logname);
 355         strcpy(seclogname + (ptr - logname), "-sptlrpc");
 356
 357         if (cfg->cfg_sub_clds & CONFIG_SUB_SPTLRPC) {
 358                 sptlrpc_cld = config_log_find_or_add(obd, seclogname, sb,
 359                                                      MGS_CFG_T_SPTLRPC, cfg);
 360                 if (IS_ERR(sptlrpc_cld)) {
 361                         rc = PTR_ERR(sptlrpc_cld);
 362                         CERROR("%s: can't create sptlrpc log %s: rc = %d\n",
 363                                obd->obd_name, seclogname, rc);
 364                         GOTO(out_err, rc);
 365                 }
 366         }
 367
 368         if (cfg->cfg_sub_clds & CONFIG_SUB_PARAMS) {
 369                 params_cld = config_log_find_or_add(obd, PARAMS_FILENAME, sb,
 370                                                     MGS_CFG_T_PARAMS, cfg);
 371                 if (IS_ERR(params_cld)) {
 372                         rc = PTR_ERR(params_cld);
 373                         CERROR("%s: can't create params log: rc = %d\n",
 374                                obd->obd_name, rc);
 375                         GOTO(out_sptlrpc, rc);
 376                 }
 377         }
 378
 379 #ifdef HAVE_SERVER_SUPPORT
 380         if (!IS_MGS(lsi) && cfg->cfg_sub_clds & CONFIG_SUB_NODEMAP) {
 381                 nodemap_cld = config_log_find_or_add(obd, LUSTRE_NODEMAP_NAME,
 382                                                      NULL, MGS_CFG_T_NODEMAP,
 383                                                      cfg);
 384                 if (IS_ERR(nodemap_cld)) {
 385                         rc = PTR_ERR(nodemap_cld);
 386                         CERROR("%s: cannot create nodemap log: rc = %d\n",
 387                                obd->obd_name, rc);
 388                         GOTO(out_params, rc);
 389                 }
 390         }
 391
 392         if (IS_MDT(s2lsi(sb)) && cfg->cfg_sub_clds & CONFIG_SUB_BARRIER) {
 393                 snprintf(seclogname + (ptr - logname), sizeof(seclogname) - 1,
 394                          "-%s", BARRIER_FILENAME);
 395                 barrier_cld = config_log_find_or_add(obd, seclogname, sb,
 396                                                      MGS_CFG_T_BARRIER, cfg);
 397                 if (IS_ERR(barrier_cld)) {
 398                         rc = PTR_ERR(barrier_cld);
 399                         CERROR("%s: can't create barrier log: rc = %d\n",
 400                                obd->obd_name, rc);
 401                         GOTO(out_nodemap, rc);
 402                 }
 403         }
 404 #endif
 405         cld = do_config_log_add(obd, logname, MGS_CFG_T_CONFIG, cfg, sb);
 406         if (IS_ERR(cld)) {
 407                 rc = PTR_ERR(cld);
 408                 CERROR("%s: can't create log: rc = %d\n",
 409                        obd->obd_name, rc);
 410 #ifdef HAVE_SERVER_SUPPORT
 411                 GOTO(out_barrier, rc);
 412 #else
 413                 GOTO(out_params, rc);
 414 #endif
 415         }
 416
 417         LASSERT(lsi->lsi_lmd);
 418         if (!test_bit(LMD_FLG_NOIR, lsi->lsi_lmd->lmd_flags) &&
 419             cfg->cfg_sub_clds & CONFIG_SUB_RECOVER) {
 420                 struct config_llog_data *recover_cld;
 421
 422                 ptr = strrchr(seclogname, '-');
 423                 if (ptr != NULL) {
 424                         *ptr = 0;
 425                 } else {
 426                         CERROR("%s: sptlrpc log name not correct, %s: rc = %d\n",
 427                                obd->obd_name, seclogname, -EINVAL);
 428                         GOTO(out_cld, rc = -EINVAL);
 429                 }
 430
 431                 recover_cld = config_recover_log_add(obd, seclogname, cfg, sb);
 432                 if (IS_ERR(recover_cld)) {
 433                         rc = PTR_ERR(recover_cld);
 434                         CERROR("%s: can't create recover log: rc = %d\n",
 435                                obd->obd_name, rc);
 436                         GOTO(out_cld, rc);
 437                 }
 438
 439                 mutex_lock(&cld->cld_lock);
 440                 locked = true;
 441                 cld->cld_recover = recover_cld;
 442         }
 443
 444         if (!locked)
 445                 mutex_lock(&cld->cld_lock);
 446 #ifdef HAVE_SERVER_SUPPORT
 447         cld->cld_barrier = barrier_cld;
 448         cld->cld_nodemap = nodemap_cld;
 449 #endif
 450         cld->cld_params = params_cld;
 451         cld->cld_sptlrpc = sptlrpc_cld;
 452         mutex_unlock(&cld->cld_lock);
 453
 454         RETURN(cld);
 455
 456 out_cld:
 457         config_log_put(cld);
 458 #ifdef HAVE_SERVER_SUPPORT
 459 out_barrier:
 460         config_log_put(barrier_cld);
 461 out_nodemap:
 462         config_log_put(nodemap_cld);
 463 #endif
 464 out_params:
 465         config_log_put(params_cld);
 466 out_sptlrpc:
 467         config_log_put(sptlrpc_cld);
 468 out_err:
 469         return ERR_PTR(rc);
 470 }
 471
 472 DEFINE_MUTEX(llog_process_lock);
 473
 474 static inline void config_mark_cld_stop_nolock(struct config_llog_data *cld)
 475 {
 476         ENTRY;
 477
 478         spin_lock(&config_list_lock);
 479         cld->cld_stopping = 1;
 480         spin_unlock(&config_list_lock);
 481
 482         CDEBUG(D_INFO, "lockh %#llx\n", cld->cld_lockh.cookie);
 483         if (!ldlm_lock_addref_try(&cld->cld_lockh, LCK_CR))
 484                 ldlm_lock_decref_and_cancel(&cld->cld_lockh, LCK_CR);
 485 }
 486
 487 static inline void config_mark_cld_stop(struct config_llog_data *cld)
 488 {
 489         if (cld) {
 490                 mutex_lock(&cld->cld_lock);
 491                 config_mark_cld_stop_nolock(cld);
 492                 mutex_unlock(&cld->cld_lock);
 493         }
 494 }
 495
 496 /** Stop watching for updates on this log.
 497  */
 498 static int config_log_end(char *logname, struct config_llog_instance *cfg)
 499 {
 500         struct config_llog_data *cld;
 501         struct config_llog_data *cld_sptlrpc = NULL;
 502         struct config_llog_data *cld_params = NULL;
 503         struct config_llog_data *cld_recover = NULL;
 504         struct config_llog_data *cld_nodemap = NULL;
 505         struct config_llog_data *cld_barrier = NULL;
 506         int rc = 0;
 507
 508         ENTRY;
 509
 510         cld = config_log_find(logname, cfg);
 511         if (cld == NULL)
 512                 RETURN(-ENOENT);
 513
 514         mutex_lock(&cld->cld_lock);
 515         /*
 516          * if cld_stopping is set, it means we didn't start the log thus
 517          * not owning the start ref. this can happen after previous umount:
 518          * the cld still hanging there waiting for lock cancel, and we
 519          * remount again but failed in the middle and call log_end without
 520          * calling start_log.
 521          */
 522         if (unlikely(cld->cld_stopping)) {
 523                 mutex_unlock(&cld->cld_lock);
 524                 /* drop the ref from the find */
 525                 config_log_put(cld);
 526                 RETURN(rc);
 527         }
 528
 529         cld_recover = cld->cld_recover;
 530         cld->cld_recover = NULL;
 531         cld_params = cld->cld_params;
 532         cld->cld_params = NULL;
 533         cld_nodemap = cld->cld_nodemap;
 534         cld->cld_nodemap = NULL;
 535         cld_barrier = cld->cld_barrier;
 536         cld->cld_barrier = NULL;
 537         cld_sptlrpc = cld->cld_sptlrpc;
 538         cld->cld_sptlrpc = NULL;
 539
 540         config_mark_cld_stop_nolock(cld);
 541         mutex_unlock(&cld->cld_lock);
 542
 543         config_mark_cld_stop(cld_recover);
 544         config_log_put(cld_recover);
 545         config_mark_cld_stop(cld_params);
 546         config_log_put(cld_params);
 547         config_mark_cld_stop(cld_barrier);
 548         config_log_put(cld_barrier);
 549         /* don't explicitly set cld_stopping on sptlrpc lock here, as other
 550          * targets may be active, it will be done in config_log_put if necessary
 551          */
 552         config_log_put(cld_sptlrpc);
 553         /* don't set cld_stopping on nm lock as other targets may be active */
 554         config_log_put(cld_nodemap);
 555
 556         /* drop the ref from the find */
 557         config_log_put(cld);
 558         /* drop the start ref */
 559         config_log_put(cld);
 560
 561         CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
 562                rc);
 563         RETURN(rc);
 564 }
 565
 566 int lprocfs_mgc_rd_ir_state(struct seq_file *m, void *data)
 567 {
 568         struct obd_device       *obd = data;
 569         struct obd_import       *imp;
 570         struct obd_connect_data *ocd;
 571         struct config_llog_data *cld;
 572         int rc = 0;
 573
 574         ENTRY;
 575         LASSERT(obd);
 576         with_imp_locked(obd, imp, rc) {
 577                 ocd = &imp->imp_connect_data;
 578
 579                 seq_printf(m, "imperative_recovery: %s\n",
 580                            OCD_HAS_FLAG(ocd, IMP_RECOV) ?
 581                            "ENABLED" : "DISABLED");
 582         }
 583         if (rc)
 584                 RETURN(rc);
 585
 586         seq_puts(m, "client_state:\n");
 587
 588         spin_lock(&config_list_lock);
 589         list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 590                 if (cld->cld_recover == NULL)
 591                         continue;
 592                 seq_printf(m,  "    - { client: %s, nidtbl_version: %u }\n",
 593                            cld->cld_logname,
 594                            cld->cld_recover->cld_cfg.cfg_last_idx);
 595         }
 596         spin_unlock(&config_list_lock);
 597
 598         RETURN(0);
 599 }
 600
 601 /* reenqueue any lost locks */
 602 #define RQ_RUNNING      0x1
 603 #define RQ_NOW          0x2
 604 #define RQ_LATER        0x4
 605 #define RQ_STOP         0x8
 606 #define RQ_PRECLEANUP   0x10
 607 static int                    rq_state;
 608 static wait_queue_head_t      rq_waitq;
 609 static DECLARE_COMPLETION(rq_exit);
 610 static DECLARE_COMPLETION(rq_start);
 611
 612 static void do_requeue(struct config_llog_data *cld)
 613 {
 614         int rc = 0;
 615
 616         ENTRY;
 617
 618         /*
 619          * Do not run mgc_process_log on a disconnected export or an
 620          * export which is being disconnected. Take the client
 621          * semaphore to make the check non-racy.
 622          */
 623         down_read_nested(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem,
 624                          OBD_CLI_SEM_MGC);
 625         if (cld->cld_mgcexp->exp_obd->u.cli.cl_conn_count != 0) {
 626                 CDEBUG(D_MGC, "updating log %s\n", cld->cld_logname);
 627                 rc = mgc_process_log(cld->cld_mgcexp->exp_obd, cld);
 628                 if (rc && rc != -ENOENT)
 629                         CERROR("failed processing log: %d\n", rc);
 630         } else {
 631                 CDEBUG(D_MGC, "disconnecting, won't update log %s\n",
 632                        cld->cld_logname);
 633         }
 634         up_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
 635
 636         EXIT;
 637 }
 638
 639 static int mgc_requeue_thread(void *data)
 640 {
 641         int rc = 0;
 642         bool first = true;
 643
 644         ENTRY;
 645
 646         CDEBUG(D_MGC, "Starting requeue thread\n");
 647
 648         /* Keep trying failed locks periodically */
 649         spin_lock(&config_list_lock);
 650         rq_state |= RQ_RUNNING;
 651         while (!(rq_state & RQ_STOP)) {
 652                 struct config_llog_data *cld, *cld_prev;
 653                 int to;
 654
 655                 /* Any new or requeued lostlocks will change the state */
 656                 rq_state &= ~(RQ_NOW | RQ_LATER);
 657                 spin_unlock(&config_list_lock);
 658
 659                 if (first) {
 660                         first = false;
 661                         complete(&rq_start);
 662                 }
 663
 664                 /* Always wait a few seconds to allow the server who
 665                  * caused the lock revocation to finish its setup, plus some
 666                  * random so everyone doesn't try to reconnect at once.
 667                  */
 668                 to = mgc_requeue_timeout_min == 0 ? 1 : mgc_requeue_timeout_min;
 669                 to = cfs_time_seconds(mgc_requeue_timeout_min) +
 670                         get_random_u32_below(cfs_time_seconds(to));
 671                 wait_event_idle_timeout(rq_waitq,
 672                                         rq_state & (RQ_STOP | RQ_PRECLEANUP),
 673                                         to);
 674
 675                 /*
 676                  * iterate & processing through the list. for each cld, process
 677                  * its depending sptlrpc cld firstly (if any) and then itself.
 678                  *
 679                  * it's guaranteed any item in the list must have
 680                  * reference > 0; and if cld_lostlock is set, at
 681                  * least one reference is taken by the previous enqueue.
 682                  */
 683                 cld_prev = NULL;
 684
 685                 spin_lock(&config_list_lock);
 686                 rq_state &= ~RQ_PRECLEANUP;
 687                 list_for_each_entry(cld, &config_llog_list,
 688                                     cld_list_chain) {
 689                         if (!cld->cld_lostlock || cld->cld_stopping)
 690                                 continue;
 691
 692                         /* hold reference to avoid being freed during
 693                          * subsequent processing.
 694                          */
 695                         config_log_get(cld);
 696                         cld->cld_lostlock = 0;
 697                         spin_unlock(&config_list_lock);
 698
 699                         config_log_put(cld_prev);
 700                         cld_prev = cld;
 701
 702                         if (likely(!(rq_state & RQ_STOP))) {
 703                                 do_requeue(cld);
 704                                 spin_lock(&config_list_lock);
 705                         } else {
 706                                 spin_lock(&config_list_lock);
 707                                 break;
 708                         }
 709                 }
 710                 spin_unlock(&config_list_lock);
 711                 config_log_put(cld_prev);
 712
 713                 /* Wait a bit to see if anyone else needs a requeue */
 714                 wait_event_idle(rq_waitq, rq_state & (RQ_NOW | RQ_STOP));
 715                 spin_lock(&config_list_lock);
 716         }
 717
 718         /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
 719         rq_state &= ~RQ_RUNNING;
 720         spin_unlock(&config_list_lock);
 721
 722         complete(&rq_exit);
 723
 724         CDEBUG(D_MGC, "Ending requeue thread\n");
 725         RETURN(rc);
 726 }
 727
 728 /* Add a cld to the list to requeue.  Start the requeue thread if needed.
 729  * We are responsible for dropping the config log reference from here on out.
 730  */
 731 static void mgc_requeue_add(struct config_llog_data *cld)
 732 {
 733         bool wakeup = false;
 734
 735         ENTRY;
 736
 737         CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n",
 738                 cld->cld_logname, refcount_read(&cld->cld_refcount),
 739                 cld->cld_stopping, rq_state);
 740
 741         /* lets cancel an existent lock to mark cld as "lostlock" */
 742         CDEBUG(D_INFO, "lockh %#llx\n", cld->cld_lockh.cookie);
 743         if (!ldlm_lock_addref_try(&cld->cld_lockh, LCK_CR))
 744                 ldlm_lock_decref_and_cancel(&cld->cld_lockh, LCK_CR);
 745
 746         mutex_lock(&cld->cld_lock);
 747         spin_lock(&config_list_lock);
 748         if (!(rq_state & RQ_STOP) && !cld->cld_stopping) {
 749                 cld->cld_lostlock = 1;
 750                 rq_state |= RQ_NOW;
 751                 wakeup = true;
 752         }
 753         spin_unlock(&config_list_lock);
 754         mutex_unlock(&cld->cld_lock);
 755         if (wakeup)
 756                 wake_up(&rq_waitq);
 757
 758         EXIT;
 759 }
 760
 761 /********************** class fns **********************/
 762 static int mgc_llog_init(const struct lu_env *env, struct obd_device *obd)
 763 {
 764         struct llog_ctxt        *ctxt;
 765         int                      rc;
 766
 767         ENTRY;
 768
 769         /* setup only remote ctxt, the local disk context is switched per each
 770          * filesystem during mgc_fs_setup()
 771          */
 772         rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_REPL_CTXT, obd,
 773                         &llog_client_ops);
 774         if (rc)
 775                 RETURN(rc);
 776
 777         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 778         LASSERT(ctxt);
 779
 780         llog_initiator_connect(ctxt);
 781         llog_ctxt_put(ctxt);
 782
 783         RETURN(0);
 784 }
 785
 786 static int mgc_llog_fini(const struct lu_env *env, struct obd_device *obd)
 787 {
 788         struct llog_ctxt *ctxt;
 789
 790         ENTRY;
 791
 792         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 793         if (ctxt)
 794                 llog_cleanup(env, ctxt);
 795
 796         RETURN(0);
 797 }
 798
 799
 800 static atomic_t mgc_count = ATOMIC_INIT(0);
 801 static int mgc_precleanup(struct obd_device *obd)
 802 {
 803         int     rc = 0;
 804         int     temp;
 805
 806         ENTRY;
 807
 808         if (atomic_dec_and_test(&mgc_count)) {
 809                 LASSERT(rq_state & RQ_RUNNING);
 810                 /* stop requeue thread */
 811                 temp = RQ_STOP;
 812         } else {
 813                 /* wakeup requeue thread to clean our cld */
 814                 temp = RQ_NOW | RQ_PRECLEANUP;
 815         }
 816
 817         spin_lock(&config_list_lock);
 818         rq_state |= temp;
 819         spin_unlock(&config_list_lock);
 820         wake_up(&rq_waitq);
 821
 822         if (temp & RQ_STOP)
 823                 wait_for_completion(&rq_exit);
 824         obd_cleanup_client_import(obd);
 825
 826         rc = mgc_llog_fini(NULL, obd);
 827         if (rc != 0)
 828                 CERROR("failed to cleanup llogging subsystems\n");
 829
 830         RETURN(rc);
 831 }
 832
 833 static int mgc_cleanup(struct obd_device *obd)
 834 {
 835         int rc;
 836
 837         ENTRY;
 838
 839         /* COMPAT_146 - old config logs may have added profiles secretly */
 840         if (atomic_read(&obd->obd_type->typ_refcnt) <= 1)
 841                 /* Only for the last mgc */
 842                 class_del_profiles();
 843
 844         lprocfs_obd_cleanup(obd);
 845         ptlrpcd_decref();
 846
 847         rc = client_obd_cleanup(obd);
 848         RETURN(rc);
 849 }
 850
 851 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 852 {
 853         struct task_struct      *task;
 854         int                      rc;
 855
 856         ENTRY;
 857
 858         rc = ptlrpcd_addref();
 859         if (rc < 0)
 860                 RETURN(rc);
 861
 862         rc = client_obd_setup(obd, lcfg);
 863         if (rc)
 864                 GOTO(err_decref, rc);
 865
 866         rc = mgc_llog_init(NULL, obd);
 867         if (rc) {
 868                 CERROR("failed to setup llogging subsystems\n");
 869                 GOTO(err_cleanup, rc);
 870         }
 871
 872         rc = mgc_tunables_init(obd);
 873         if (rc)
 874                 GOTO(err_sysfs, rc);
 875
 876         if (atomic_inc_return(&mgc_count) == 1) {
 877                 rq_state = 0;
 878                 init_waitqueue_head(&rq_waitq);
 879
 880                 /* start requeue thread */
 881                 task = kthread_run(mgc_requeue_thread, NULL, "ll_cfg_requeue");
 882                 if (IS_ERR(task)) {
 883                         rc = PTR_ERR(task);
 884                         CERROR("%s: cannot start requeue thread: rc = %d; "
 885                                "no more log updates\n",
 886                                obd->obd_name, rc);
 887                         GOTO(err_sysfs, rc);
 888                 }
 889                 /* rc is the task_struct pointer of mgc_requeue_thread. */
 890                 rc = 0;
 891                 wait_for_completion(&rq_start);
 892         }
 893
 894         RETURN(rc);
 895
 896 err_sysfs:
 897         lprocfs_obd_cleanup(obd);
 898 err_cleanup:
 899         client_obd_cleanup(obd);
 900 err_decref:
 901         ptlrpcd_decref();
 902         RETURN(rc);
 903 }
 904
 905 /* based on ll_mdc_blocking_ast */
 906 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 907                             void *data, int flag)
 908 {
 909         struct lustre_handle lockh;
 910         struct config_llog_data *cld = (struct config_llog_data *)data;
 911         int rc = 0;
 912
 913         ENTRY;
 914
 915         switch (flag) {
 916         case LDLM_CB_BLOCKING:
 917                 /* mgs wants the lock, give it up... */
 918                 LDLM_DEBUG(lock, "MGC blocking CB");
 919                 ldlm_lock2handle(lock, &lockh);
 920                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
 921                 break;
 922         case LDLM_CB_CANCELING:
 923                 /* We've given up the lock, prepare ourselves to update. */
 924                 LDLM_DEBUG(lock, "MGC cancel CB");
 925
 926                 CDEBUG(D_MGC, "Lock res "DLDLMRES" (%.8s)\n",
 927                        PLDLMRES(lock->l_resource),
 928                        (char *)&lock->l_resource->lr_name.name[0]);
 929
 930                 if (!cld) {
 931                         CDEBUG(D_INFO, "missing data, won't requeue\n");
 932                         break;
 933                 }
 934
 935                 lock->l_ast_data = NULL;
 936                 cld->cld_lockh.cookie = 0;
 937                 /* Are we done with this log? */
 938                 if (cld->cld_stopping) {
 939                         CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
 940                                 cld->cld_logname);
 941                         config_log_put(cld);
 942                         break;
 943                 }
 944                 /* Make sure not to re-enqueue when the mgc is stopping
 945                  * (we get called from client_disconnect_export)
 946                  */
 947                 if (lock->l_conn_export == NULL ||
 948                     lock->l_conn_export->exp_obd->u.cli.cl_conn_count == 0) {
 949                         CDEBUG(D_MGC, "log %.8s: disconnecting, won't requeue\n",
 950                                 cld->cld_logname);
 951                         config_log_put(cld);
 952                         break;
 953                 }
 954
 955                 /* Re-enqueue now */
 956                 mgc_requeue_add(cld);
 957                 config_log_put(cld);
 958                 break;
 959         default:
 960                 LBUG();
 961         }
 962
 963         RETURN(rc);
 964 }
 965
 966 /* Take a config lock so we can get cancel notifications */
 967 static int mgc_enqueue(struct obd_export *exp, enum ldlm_type type,
 968                        union ldlm_policy_data *policy, enum ldlm_mode mode,
 969                        __u64 *flags, ldlm_glimpse_callback glimpse_callback,
 970                        void *data, __u32 lvb_len, void *lvb_swabber,
 971                        struct lustre_handle *lockh)
 972 {
 973         struct config_llog_data *cld = (struct config_llog_data *)data;
 974         struct ldlm_enqueue_info einfo = {
 975                 .ei_type        = type,
 976                 .ei_mode        = mode,
 977                 .ei_cb_bl       = mgc_blocking_ast,
 978                 .ei_cb_cp       = ldlm_completion_ast,
 979                 .ei_cb_gl       = glimpse_callback,
 980         };
 981         struct ptlrpc_request *req;
 982         int short_limit = cld_is_sptlrpc(cld);
 983         int rc;
 984
 985         ENTRY;
 986
 987         if (!exp)
 988                 RETURN(-EBADR);
 989
 990         CDEBUG(D_MGC, "Enqueue for %s (res %#llx)\n", cld->cld_logname,
 991                cld->cld_resid.name[0]);
 992
 993         /* We need a callback for every lockholder, so don't try to
 994          * ldlm_lock_match (see rev 1.1.2.11.2.47)
 995          */
 996         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
 997                                         &RQF_LDLM_ENQUEUE, LUSTRE_DLM_VERSION,
 998                                         LDLM_ENQUEUE);
 999         if (req == NULL)
1000                 RETURN(-ENOMEM);
1001
1002         req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, 0);
1003         ptlrpc_request_set_replen(req);
1004
1005         /* check if this is server or client */
1006         if (cld->cld_cfg.cfg_sb &&
1007             IS_SERVER(s2lsi(cld->cld_cfg.cfg_sb)))
1008                 short_limit = 1;
1009
1010         /* Limit how long we will wait for the enqueue to complete */
1011         req->rq_delay_limit = short_limit ? 5 : MGC_ENQUEUE_LIMIT(exp->exp_obd);
1012         rc = ldlm_cli_enqueue(exp, &req, &einfo, &cld->cld_resid, NULL, flags,
1013                               NULL, 0, LVB_T_NONE, lockh, 0);
1014         /* A failed enqueue should still call the mgc_blocking_ast,
1015          * where it will be requeued if needed ("grant failed").
1016          */
1017         ptlrpc_req_finished(req);
1018         RETURN(rc);
1019 }
1020
1021 static int mgc_cancel(struct obd_export *exp, enum ldlm_mode mode,
1022                       struct lustre_handle *lockh)
1023 {
1024         ENTRY;
1025
1026         ldlm_lock_decref(lockh, mode);
1027
1028         RETURN(0);
1029 }
1030
1031 static void mgc_notify_active(struct obd_device *unused)
1032 {
1033         /* wakeup mgc_requeue_thread to requeue mgc lock */
1034         spin_lock(&config_list_lock);
1035         rq_state |= RQ_NOW;
1036         spin_unlock(&config_list_lock);
1037         wake_up(&rq_waitq);
1038
1039         /* TODO: Help the MGS rebuild nidtbl. -jay */
1040 }
1041
1042 static int mgc_set_info_async(const struct lu_env *env, struct obd_export *exp,
1043                               u32 keylen, void *key,
1044                               u32 vallen, void *val,
1045                               struct ptlrpc_request_set *set)
1046 {
1047         int rc = -EINVAL;
1048
1049         ENTRY;
1050
1051         /* Turn off initial_recov after we try all backup servers once */
1052         if (KEY_IS(KEY_INIT_RECOV_BACKUP)) {
1053                 struct obd_import *imp = class_exp2cliimp(exp);
1054                 int value;
1055
1056                 if (vallen != sizeof(int))
1057                         RETURN(-EINVAL);
1058                 value = *(int *)val;
1059                 CDEBUG(D_MGC, "InitRecov %s %d/d%d:i%d:r%d:or%d:%s\n",
1060                        imp->imp_obd->obd_name, value,
1061                        imp->imp_deactive, imp->imp_invalid,
1062                        imp->imp_replayable, imp->imp_obd->obd_replayable,
1063                        ptlrpc_import_state_name(imp->imp_state));
1064                 /* Resurrect the import immediately if
1065                  * 1. we previously got disconnected,
1066                  * 2. value > 1 (at the same node with MGS)
1067                  */
1068                 if (value > 1) {
1069                         struct adaptive_timeout *at;
1070
1071                         at = &imp->imp_at.iat_net_latency;
1072                         at_reset(at, INITIAL_CONNECT_TIMEOUT);
1073                 }
1074
1075                 if (imp->imp_state == LUSTRE_IMP_DISCON || value > 1)
1076                         ptlrpc_reconnect_import(imp);
1077
1078                 RETURN(0);
1079         }
1080
1081         if (KEY_IS(KEY_MGSSEC)) {
1082                 struct client_obd     *cli = &exp->exp_obd->u.cli;
1083                 struct sptlrpc_flavor  flvr;
1084
1085                 /*
1086                  * empty string means using current flavor, if which haven't
1087                  * been set yet, set it as null.
1088                  *
1089                  * if flavor has been set previously, check the asking flavor
1090                  * must match the existing one.
1091                  */
1092                 if (vallen == 0) {
1093                         if (cli->cl_flvr_mgc.sf_rpc != SPTLRPC_FLVR_INVALID)
1094                                 RETURN(0);
1095                         val = "null";
1096                         vallen = 4;
1097                 }
1098
1099                 rc = sptlrpc_parse_flavor(val, &flvr);
1100                 if (rc) {
1101                         CERROR("invalid sptlrpc flavor %s to MGS\n",
1102                                (char *) val);
1103                         RETURN(rc);
1104                 }
1105
1106                 /* caller already hold a mutex */
1107                 if (cli->cl_flvr_mgc.sf_rpc == SPTLRPC_FLVR_INVALID) {
1108                         cli->cl_flvr_mgc = flvr;
1109                 } else if (memcmp(&cli->cl_flvr_mgc, &flvr,
1110                                   sizeof(flvr)) != 0) {
1111                         char    str[20];
1112
1113                         sptlrpc_flavor2name(&cli->cl_flvr_mgc, str,
1114                                             sizeof(str));
1115                         LCONSOLE_ERROR("asking sptlrpc flavor %s to MGS but currently %s is in use\n",
1116                                        (char *) val, str);
1117                         rc = -EPERM;
1118                 }
1119                 RETURN(rc);
1120         }
1121
1122 #ifdef HAVE_SERVER_SUPPORT
1123         rc = mgc_set_info_async_server(env, exp, keylen, key, vallen, val, set);
1124 #endif
1125         RETURN(rc);
1126 }
1127
1128 static int mgc_get_info(const struct lu_env *env, struct obd_export *exp,
1129                         __u32 keylen, void *key, __u32 *vallen, void *val)
1130 {
1131         int rc = -EINVAL;
1132
1133         if (KEY_IS(KEY_CONN_DATA)) {
1134                 struct obd_import *imp = class_exp2cliimp(exp);
1135                 struct obd_connect_data *data = val;
1136
1137                 if (*vallen == sizeof(*data)) {
1138                         *data = imp->imp_connect_data;
1139                         rc = 0;
1140                 }
1141         }
1142
1143         return rc;
1144 }
1145
1146 static int mgc_import_event(struct obd_device *obd,
1147                             struct obd_import *imp,
1148                             enum obd_import_event event)
1149 {
1150         int rc = 0;
1151
1152         LASSERT(imp->imp_obd == obd);
1153         CDEBUG(D_MGC, "import event %#x\n", event);
1154
1155         switch (event) {
1156         case IMP_EVENT_DISCON:
1157                 /* MGC imports should not wait for recovery */
1158                 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1159                         ptlrpc_pinger_ir_down();
1160                 break;
1161         case IMP_EVENT_INACTIVE:
1162                 break;
1163         case IMP_EVENT_INVALIDATE: {
1164                 struct ldlm_namespace *ns = obd->obd_namespace;
1165
1166                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
1167                 break;
1168         }
1169         case IMP_EVENT_ACTIVE:
1170                 CDEBUG(D_INFO, "%s: Reactivating import\n", obd->obd_name);
1171                 /* Clearing obd_no_recov allows us to continue pinging */
1172                 obd->obd_no_recov = 0;
1173                 mgc_notify_active(obd);
1174                 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1175                         ptlrpc_pinger_ir_up();
1176                 break;
1177         case IMP_EVENT_OCD:
1178                 break;
1179         case IMP_EVENT_DEACTIVATE:
1180         case IMP_EVENT_ACTIVATE:
1181                 break;
1182         default:
1183                 CERROR("Unknown import event %#x\n", event);
1184                 LBUG();
1185         }
1186         RETURN(rc);
1187 }
1188
1189 static int mgc_apply_recover_logs(struct obd_device *mgc,
1190                                   struct config_llog_data *cld,
1191                                   __u64 max_version,
1192                                   void *data, int datalen, bool mne_swab)
1193 {
1194         struct config_llog_instance *cfg = &cld->cld_cfg;
1195         struct lustre_cfg *lcfg;
1196         struct lustre_cfg_bufs bufs;
1197         u64 prev_version = 0;
1198         char inst[MTI_NAME_MAXLEN + 1];
1199         char *buf;
1200         int bufsz;
1201         int pos = 0;
1202         int rc  = 0;
1203         int off = 0;
1204         unsigned long dynamic_nids;
1205
1206         ENTRY;
1207         LASSERT(cfg->cfg_instance != 0);
1208         LASSERT(ll_get_cfg_instance(cfg->cfg_sb) == cfg->cfg_instance);
1209
1210         /* get dynamic nids setting */
1211         dynamic_nids = mgc->obd_dynamic_nids;
1212
1213         if (!IS_SERVER(s2lsi(cfg->cfg_sb))) {
1214                 pos = snprintf(inst, sizeof(inst), "%016lx", cfg->cfg_instance);
1215                 if (pos >= PAGE_SIZE)
1216                         return -E2BIG;
1217 #ifdef HAVE_SERVER_SUPPORT
1218         } else {
1219                 struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1220
1221                 LASSERT(IS_MDT(lsi));
1222                 rc = server_name2svname(lsi->lsi_svname, inst, NULL,
1223                                         sizeof(inst));
1224                 if (rc)
1225                         RETURN(-EINVAL);
1226 #endif /* HAVE_SERVER_SUPPORT */
1227         }
1228
1229         OBD_ALLOC(buf, PAGE_SIZE);
1230         if (!buf)
1231                 return -ENOMEM;
1232         bufsz = PAGE_SIZE;
1233         pos = 0;
1234
1235         while (datalen > 0) {
1236                 struct mgs_nidtbl_entry *entry = (data + off);
1237                 struct lnet_nid *nidlist = NULL;
1238                 int entry_len = sizeof(*entry);
1239                 struct obd_device *obd;
1240                 struct obd_import *imp;
1241                 struct obd_uuid *uuid;
1242                 char *obdname;
1243                 char *cname;
1244                 char *params;
1245                 bool is_ost;
1246
1247                 rc = -EINVAL;
1248                 /* sanity checks */
1249                 if (datalen < entry_len) /* really short on data */
1250                         break;
1251
1252                 /* swab non nid data */
1253                 if (mne_swab)
1254                         lustre_swab_mgs_nidtbl_entry_header(entry);
1255
1256                 if (entry->mne_nid_count == 0) /* at least one nid entry */
1257                         break;
1258
1259                 entry_len += entry->mne_nid_count * entry->mne_nid_size;
1260                 if (datalen < entry_len) /* must have entry_len at least */
1261                         break;
1262
1263                 if (entry->mne_length > PAGE_SIZE) {
1264                         CERROR("MNE too large (%u)\n", entry->mne_length);
1265                         break;
1266                 }
1267
1268                 /* improper mne_lenth */
1269                 if (entry->mne_length < entry_len)
1270                         break;
1271
1272                 /* entry length reports larger than all the data passed in */
1273                 if (datalen < entry->mne_length)
1274                         break;
1275
1276                 /* Looks OK. Can process this entry? else move to next entry */
1277                 off += entry->mne_length;
1278                 datalen -= entry->mne_length;
1279                 if (datalen < 0)
1280                         break;
1281
1282                 if (entry->mne_version > max_version) {
1283                         CERROR("entry index(%lld) is over max_index(%lld)\n",
1284                                entry->mne_version, max_version);
1285                         break;
1286                 }
1287
1288                 if (prev_version >= entry->mne_version) {
1289                         CERROR("index unsorted, prev %lld, now %lld\n",
1290                                prev_version, entry->mne_version);
1291                         break;
1292                 }
1293                 prev_version = entry->mne_version;
1294
1295                 if (entry->mne_nid_type == 0) {
1296                         struct lnet_nid *nid;
1297                         int i;
1298
1299                         OBD_ALLOC_PTR_ARRAY(nidlist, entry->mne_nid_count);
1300                         if (!nidlist) {
1301                                 rc = -ENOMEM;
1302                                 break;
1303                         }
1304
1305                         /* Keep this nid data swab for normal mixed
1306                          * endian handling. LU-1644
1307                          */
1308                         if (mne_swab)
1309                                 lustre_swab_mgs_nidtbl_entry_content(entry);
1310
1311                         /* Turn old NID format to newer format. */
1312                         nid = nidlist;
1313                         for (i = 0; i < entry->mne_nid_count; i++) {
1314                                 lnet_nid4_to_nid(entry->u.nids[i], nid);
1315                                 nid += sizeof(struct lnet_nid);
1316                         }
1317                 } else {
1318                         /* Handle the case if struct lnet_nid is expanded in
1319                          * the future. The MGS should prevent this but just
1320                          * in case.
1321                          */
1322                         if (entry->mne_nid_size > sizeof(struct lnet_nid))
1323                                 continue;
1324
1325                         nidlist = entry->u.nidlist;
1326                 }
1327
1328                 /*
1329                  * Write a string with format "nid::instance" to
1330                  * lustre/<osc|mdc>/<target>-<osc|mdc>-<instance>/import.
1331                  */
1332                 is_ost = entry->mne_type == LDD_F_SV_TYPE_OST;
1333                 memset(buf, 0, bufsz);
1334                 obdname = buf;
1335                 pos = 0;
1336
1337                 /* lustre-OST0001-osc-<instance #> */
1338                 strcpy(obdname, cld->cld_logname);
1339                 cname = strrchr(obdname, '-');
1340                 if (cname == NULL) {
1341                         CERROR("mgc %s: invalid logname %s\n",
1342                                mgc->obd_name, obdname);
1343                         if (entry->mne_nid_type == 0)
1344                                 OBD_FREE_PTR_ARRAY(nidlist,
1345                                                    entry->mne_nid_count);
1346                         break;
1347                 }
1348
1349                 pos = cname - obdname;
1350                 obdname[pos] = 0;
1351                 pos += sprintf(obdname + pos, "-%s%04x",
1352                                is_ost ? "OST" : "MDT", entry->mne_index);
1353
1354                 cname = is_ost ? "osc" : "mdc",
1355                         pos += snprintf(obdname + pos, bufsz, "-%s-%s", cname,
1356                                         inst);
1357                 lustre_cfg_bufs_reset(&bufs, obdname);
1358
1359                 /* find the obd by obdname */
1360                 obd = class_name2obd(obdname);
1361                 if (obd == NULL) {
1362                         CDEBUG(D_INFO, "mgc %s: cannot find obdname %s\n",
1363                                mgc->obd_name, obdname);
1364                         rc = 0;
1365                         /* this is a safe race, when the ost is starting up...*/
1366                         continue;
1367                 }
1368
1369                 /* osc.import = "connection=<Conn UUID>::<target instance>" */
1370                 ++pos;
1371                 params = buf + pos;
1372                 pos += sprintf(params, "%s.import=%s", cname, "connection=");
1373                 uuid = (struct obd_uuid *)(buf + pos);
1374
1375                 with_imp_locked(obd, imp, rc) {
1376                         struct obd_uuid server_uuid;
1377                         char *primary_nid;
1378                         int prim_nid_len;
1379
1380                         /* iterate all nids to find one */
1381                         /* find uuid by nid */
1382                         /* create import entries if they don't exist */
1383                         rc = client_import_add_nids_to_conn(imp, nidlist,
1384                                                            entry->mne_nid_count,
1385                                                            entry->mne_nid_size,
1386                                                            uuid);
1387                         if (rc != -ENOENT || !dynamic_nids)
1388                                 continue;
1389
1390                         /* create a new connection for this import */
1391                         primary_nid = libcfs_nidstr(&nidlist[0]);
1392                         prim_nid_len = strlen(primary_nid) + 1;
1393                         if (prim_nid_len > UUID_MAX)
1394                                 goto fail;
1395
1396                         strncpy(server_uuid.uuid, primary_nid,
1397                                 prim_nid_len);
1398
1399                         CDEBUG(D_INFO, "Adding a connection for %s\n",
1400                                primary_nid);
1401
1402                         rc = client_import_dyn_add_conn(imp, &server_uuid,
1403                                                         &nidlist[0], 1);
1404                         if (rc < 0) {
1405                                 CERROR("%s: Failed to add new connection with NID '%s' to import: rc = %d\n",
1406                                        obd->obd_name, primary_nid, rc);
1407                                 goto fail;
1408                         }
1409
1410                         rc = client_import_add_nids_to_conn(imp, nidlist,
1411                                                            entry->mne_nid_count,
1412                                                            entry->mne_nid_size,
1413                                                            uuid);
1414                         if (rc < 0)
1415                                 CERROR("%s: failed to lookup UUID: rc = %d\n",
1416                                        obd->obd_name, rc);
1417 fail:;
1418                 }
1419
1420                 if (rc == -ENODEV) {
1421                         /* client does not connect to the OST yet */
1422                         rc = 0;
1423                         goto free_nids;
1424                 }
1425
1426                 if (rc < 0 && rc != -ENOSPC) {
1427                         CERROR("mgc: cannot find UUID by nid '%s': rc = %d\n",
1428                                libcfs_nidstr(&nidlist[0]), rc);
1429
1430                         /* For old NID format case the nidlist was allocated. */
1431                         if (entry->mne_nid_type == 0)
1432                                 OBD_FREE_PTR_ARRAY(nidlist,
1433                                                    entry->mne_nid_count);
1434                         break;
1435                 }
1436
1437                 CDEBUG(D_INFO, "Found UUID '%s' by NID '%s'\n",
1438                        uuid->uuid, libcfs_nidstr(&nidlist[0]));
1439
1440                 pos += strlen(uuid->uuid);
1441                 pos += sprintf(buf + pos, "::%u", entry->mne_instance);
1442                 LASSERT(pos < bufsz);
1443
1444                 lustre_cfg_bufs_set_string(&bufs, 1, params);
1445
1446                 OBD_ALLOC(lcfg, lustre_cfg_len(bufs.lcfg_bufcount,
1447                                                bufs.lcfg_buflen));
1448                 if (!lcfg) {
1449                         rc = -ENOMEM;
1450                         break;
1451                 }
1452                 lustre_cfg_init(lcfg, LCFG_PARAM, &bufs);
1453
1454                 CDEBUG(D_INFO, "ir apply logs %lld/%lld for %s -> %s\n",
1455                        prev_version, max_version, obdname, params);
1456
1457                 rc = class_process_config(lcfg);
1458                 OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount,
1459                                               lcfg->lcfg_buflens));
1460                 if (rc)
1461                         CDEBUG(D_INFO, "process config for %s error %d\n",
1462                                obdname, rc);
1463
1464                 /* continue, even one with error */
1465 free_nids:
1466                 /* For old NID format case the nidlist was allocated. */
1467                 if (entry->mne_nid_type == 0)
1468                         OBD_FREE_PTR_ARRAY(nidlist, entry->mne_nid_count);
1469         }
1470
1471         OBD_FREE(buf, PAGE_SIZE);
1472
1473         RETURN(rc);
1474 }
1475
1476 /**
1477  * This function is called if this client was notified for target restarting
1478  * by the MGS. A CONFIG_READ RPC is going to send to fetch recovery or
1479  * nodemap logs.
1480  */
1481 static int mgc_process_recover_log(struct obd_device *obd,
1482                                            struct config_llog_data *cld)
1483 {
1484         struct ptlrpc_request *req = NULL;
1485         struct config_llog_instance *cfg = &cld->cld_cfg;
1486         struct mgs_config_body *body;
1487         struct mgs_config_res *res;
1488         struct ptlrpc_bulk_desc *desc;
1489         struct page **pages = NULL;
1490         int nrpages = 0;
1491         bool eof = true;
1492         bool mne_swab = false;
1493         int i;
1494         int ealen;
1495         int rc;
1496
1497         ENTRY;
1498
1499         /* allocate buffer for bulk transfer.
1500          * if this is the first time for this mgs to read logs,
1501          * CONFIG_READ_NRPAGES_INIT will be used since it will read all logs
1502          * once; otherwise, it only reads increment of logs, this should be
1503          * small and CONFIG_READ_NRPAGES will be used.
1504          */
1505         nrpages = CONFIG_READ_NRPAGES;
1506         if (cfg->cfg_last_idx == 0)
1507                 nrpages = CONFIG_READ_NRPAGES_INIT;
1508
1509         OBD_ALLOC_PTR_ARRAY_LARGE(pages, nrpages);
1510         if (pages == NULL)
1511                 GOTO(out, rc = -ENOMEM);
1512
1513         for (i = 0; i < nrpages; i++) {
1514                 pages[i] = alloc_page(GFP_KERNEL);
1515                 if (pages[i] == NULL)
1516                         GOTO(out, rc = -ENOMEM);
1517         }
1518
1519 again:
1520         LASSERT(cld_is_recover(cld));
1521         LASSERT(mutex_is_locked(&cld->cld_lock));
1522         req = ptlrpc_request_alloc(class_exp2cliimp(cld->cld_mgcexp),
1523                                    &RQF_MGS_CONFIG_READ);
1524         if (req == NULL)
1525                 GOTO(out, rc = -ENOMEM);
1526
1527         rc = ptlrpc_request_pack(req, LUSTRE_MGS_VERSION, MGS_CONFIG_READ);
1528         if (rc)
1529                 GOTO(out, rc);
1530
1531         /* pack request */
1532         body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
1533         LASSERT(body != NULL);
1534         LASSERT(sizeof(body->mcb_name) > strlen(cld->cld_logname));
1535         rc = strscpy(body->mcb_name, cld->cld_logname, sizeof(body->mcb_name));
1536         if (rc < 0)
1537                 GOTO(out, rc);
1538         body->mcb_offset = cfg->cfg_last_idx + 1;
1539         body->mcb_type = cld->cld_type;
1540         body->mcb_bits = PAGE_SHIFT;
1541         body->mcb_units = nrpages;
1542         body->mcb_rec_nid_size = sizeof(struct lnet_nid);
1543
1544         /* allocate bulk transfer descriptor */
1545         desc = ptlrpc_prep_bulk_imp(req, nrpages, 1,
1546                                     PTLRPC_BULK_PUT_SINK,
1547                                     MGS_BULK_PORTAL,
1548                                     &ptlrpc_bulk_kiov_pin_ops);
1549         if (desc == NULL)
1550                 GOTO(out, rc = -ENOMEM);
1551
1552         for (i = 0; i < nrpages; i++)
1553                 desc->bd_frag_ops->add_kiov_frag(desc, pages[i], 0,
1554                                                  PAGE_SIZE);
1555
1556         ptlrpc_request_set_replen(req);
1557         rc = ptlrpc_queue_wait(req);
1558         if (rc)
1559                 GOTO(out, rc);
1560
1561         res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
1562         if (!res)
1563                 GOTO(out, rc = -EPROTO);
1564
1565         if (res->mcr_size < res->mcr_offset)
1566                 GOTO(out, rc = -EINVAL);
1567
1568         /* always update the index even though it might have errors with
1569          * handling the recover logs
1570          */
1571         cfg->cfg_last_idx = res->mcr_offset;
1572         eof = res->mcr_offset == res->mcr_size;
1573
1574         CDEBUG(D_INFO, "Latest version %lld, more %d.\n",
1575                res->mcr_offset, eof == false);
1576
1577         ealen = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, 0);
1578         if (ealen < 0)
1579                 GOTO(out, rc = ealen);
1580
1581         if (ealen > nrpages << PAGE_SHIFT)
1582                 GOTO(out, rc = -EINVAL);
1583
1584         if (ealen == 0) { /* no logs transferred */
1585                 if (!eof)
1586                         rc = -EINVAL;
1587                 GOTO(out, rc);
1588         }
1589
1590         mne_swab = req_capsule_rep_need_swab(&req->rq_pill);
1591
1592         for (i = 0; i < nrpages && ealen > 0; i++) {
1593                 int rc2;
1594                 union lu_page *ptr;
1595
1596                 ptr = kmap(pages[i]);
1597                 rc2 = mgc_apply_recover_logs(obd, cld, res->mcr_offset, ptr,
1598                                              min_t(int, ealen, PAGE_SIZE),
1599                                              mne_swab);
1600                 kunmap(pages[i]);
1601                 if (rc2 < 0) {
1602                         CWARN("%s: error processing %s log recovery: rc = %d\n",
1603                               obd->obd_name,
1604                               cld->cld_logname,
1605                               rc2);
1606                         GOTO(out, rc = rc2);
1607                 }
1608
1609                 ealen -= PAGE_SIZE;
1610         }
1611
1612 out:
1613         if (req) {
1614                 ptlrpc_req_finished(req);
1615                 req = NULL;
1616         }
1617
1618         if (rc == 0 && !eof)
1619                 goto again;
1620
1621         if (pages) {
1622                 for (i = 0; i < nrpages; i++) {
1623                         if (pages[i] == NULL)
1624                                 break;
1625                         __free_page(pages[i]);
1626                 }
1627                 OBD_FREE_PTR_ARRAY_LARGE(pages, nrpages);
1628         }
1629         return rc;
1630 }
1631
1632 /* local_only means it cannot get remote llogs */
1633 static int mgc_process_cfg_log(struct obd_device *mgc,
1634                                struct config_llog_data *cld, int local_only)
1635 {
1636         struct llog_ctxt *ctxt;
1637         struct lustre_sb_info *lsi = NULL;
1638         int rc = 0;
1639         struct lu_env *env;
1640
1641         ENTRY;
1642         LASSERT(cld);
1643         LASSERT(mutex_is_locked(&cld->cld_lock));
1644
1645         if (cld->cld_cfg.cfg_sb)
1646                 lsi = s2lsi(cld->cld_cfg.cfg_sb);
1647
1648         /* sptlrpc llog must not keep ref to sb,
1649          * it was just needed to get lsi
1650          */
1651         if (cld_is_sptlrpc(cld))
1652                 cld->cld_cfg.cfg_sb = NULL;
1653
1654         OBD_ALLOC_PTR(env);
1655         if (!env)
1656                 RETURN(-ENOMEM);
1657
1658         rc = lu_env_init(env, LCT_MG_THREAD);
1659         if (rc)
1660                 GOTO(out_free, rc);
1661
1662         ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1663         LASSERT(ctxt);
1664 #ifdef HAVE_SERVER_SUPPORT
1665         rc = mgc_process_server_cfg_log(env, &ctxt, lsi, mgc, cld,
1666                                         local_only);
1667         if (rc == -EIO && local_only)
1668                 GOTO(out_pop, rc);
1669         if (rc && rc != -ENOENT)
1670 #else
1671         if (local_only)
1672                 GOTO(out_pop, rc = -EIO);
1673 #endif
1674                 rc = class_config_parse_llog(env, ctxt, cld->cld_logname,
1675                                              &cld->cld_cfg);
1676
1677         /*
1678          * update settings on existing OBDs.
1679          * the logname must be <fsname>-sptlrpc
1680          */
1681         if (rc == 0 && cld_is_sptlrpc(cld))
1682                 class_notify_sptlrpc_conf(cld->cld_logname,
1683                                           strlen(cld->cld_logname) -
1684                                           strlen("-sptlrpc"));
1685         EXIT;
1686
1687 out_pop:
1688         __llog_ctxt_put(env, ctxt);
1689         lu_env_fini(env);
1690 out_free:
1691         OBD_FREE_PTR(env);
1692         return rc;
1693 }
1694
1695 static bool mgc_import_in_recovery(struct obd_import *imp)
1696 {
1697         bool in_recovery = true;
1698
1699         spin_lock(&imp->imp_lock);
1700         if (imp->imp_state == LUSTRE_IMP_FULL ||
1701             imp->imp_state == LUSTRE_IMP_CLOSED)
1702                 in_recovery = false;
1703         spin_unlock(&imp->imp_lock);
1704
1705         return in_recovery;
1706 }
1707
1708 /**
1709  * Get a configuration log from the MGS and process it.
1710  *
1711  * This function is called for both clients and servers to process the
1712  * configuration log from the MGS.  The MGC enqueues a DLM lock on the
1713  * log from the MGS, and if the lock gets revoked the MGC will be notified
1714  * by the lock cancellation callback that the config log has changed,
1715  * and will enqueue another MGS lock on it, and then continue processing
1716  * the new additions to the end of the log.
1717  *
1718  * Since the MGC import is not replayable, if the import is being evicted
1719  * (rcl == -ESHUTDOWN, \see ptlrpc_import_delay_req()), retry to process
1720  * the log until recovery is finished or the import is closed.
1721  *
1722  * Make a local copy of the log before parsing it if appropriate (non-MGS
1723  * server) so that the server can start even when the MGS is down.
1724  *
1725  * There shouldn't be multiple processes running process_log at once --
1726  * sounds like badness.  It actually might be fine, as long as they're not
1727  * trying to update from the same log simultaneously, in which case we
1728  * should use a per-log semaphore instead of cld_lock.
1729  *
1730  * \param[in] mgc       MGC device by which to fetch the configuration log
1731  * \param[in] cld       log processing state (stored in lock callback data)
1732  *
1733  * \retval              0 on success
1734  * \retval              negative errno on failure
1735  */
1736 int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)
1737 {
1738         struct lustre_handle lockh = { 0 };
1739         __u64 flags = LDLM_FL_NO_LRU;
1740         int rc = 0, rcl;
1741         bool retry = false;
1742
1743         ENTRY;
1744
1745         LASSERT(cld != NULL);
1746
1747         /* I don't want multiple processes running process_log at once --
1748          * sounds like badness.  It actually might be fine, as long as
1749          * we're not trying to update from the same log
1750          * simultaneously (in which case we should use a per-log sem.)
1751          */
1752 restart:
1753         mutex_lock(&cld->cld_lock);
1754         if (cld->cld_stopping) {
1755                 mutex_unlock(&cld->cld_lock);
1756                 RETURN(0);
1757         }
1758
1759         CFS_FAIL_TIMEOUT(OBD_FAIL_MGC_PAUSE_PROCESS_LOG, 20);
1760
1761         CDEBUG(D_MGC, "Process log %s-%016lx from %d\n", cld->cld_logname,
1762                cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
1763
1764         /* Get the cfg lock on the llog */
1765         rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, LDLM_PLAIN, NULL,
1766                           LCK_CR, &flags,
1767                           cld_is_barrier(cld) ? mgc_barrier_glimpse_ast : NULL,
1768                           cld, 0, NULL, &lockh);
1769         if (rcl == 0) {
1770                 /* Get the cld, it will be released in mgc_blocking_ast. */
1771                 config_log_get(cld);
1772                 rc = ldlm_lock_set_data(&lockh, (void *)cld);
1773                 LASSERT(!lustre_handle_is_used(&cld->cld_lockh));
1774                 LASSERT(rc == 0);
1775                 cld->cld_lockh = lockh;
1776         } else {
1777                 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
1778                 cld->cld_lockh.cookie = 0;
1779
1780                 if (rcl == -ESHUTDOWN &&
1781                     atomic_read(&mgc->u.cli.cl_mgc_refcount) > 0 && !retry) {
1782                         struct obd_import *imp;
1783                         long timeout = cfs_time_seconds(obd_timeout);
1784
1785                         mutex_unlock(&cld->cld_lock);
1786                         imp = class_exp2cliimp(mgc->u.cli.cl_mgc_mgsexp);
1787
1788                         /* Let's force the pinger, and wait the import to be
1789                          * connected, note: since mgc import is non-replayable,
1790                          * and even the import state is disconnected, it does
1791                          * not mean the "recovery" is stopped, so we will keep
1792                          * waitting until timeout or the import state is
1793                          * FULL or closed
1794                          */
1795                         ptlrpc_pinger_force(imp);
1796
1797                         wait_event_idle_timeout(imp->imp_recovery_waitq,
1798                                                 !mgc_import_in_recovery(imp),
1799                                                 timeout);
1800
1801                         if (imp->imp_state == LUSTRE_IMP_FULL) {
1802                                 retry = true;
1803                                 goto restart;
1804                         } else {
1805                                 mutex_lock(&cld->cld_lock);
1806                                 /* unlock/lock mutex, so check stopping again */
1807                                 if (cld->cld_stopping) {
1808                                         mutex_unlock(&cld->cld_lock);
1809                                         RETURN(0);
1810                                 }
1811                                 spin_lock(&config_list_lock);
1812                                 cld->cld_lostlock = 1;
1813                                 spin_unlock(&config_list_lock);
1814                         }
1815                 } else {
1816                         /* mark cld_lostlock so that it will requeue
1817                          * after MGC becomes available.
1818                          */
1819                         spin_lock(&config_list_lock);
1820                         cld->cld_lostlock = 1;
1821                         spin_unlock(&config_list_lock);
1822                 }
1823         }
1824
1825         if (cld_is_recover(cld) && !rcl)
1826                 rc = mgc_process_recover_log(mgc, cld);
1827 #ifdef HAVE_SERVER_SUPPORT
1828         else if (cld_is_nodemap(cld)) {
1829                 if (rcl)
1830                         rc = rcl;
1831                 else
1832                         rc = mgc_process_nodemap_log(mgc, cld);
1833         }
1834 #endif
1835         else if (!cld_is_barrier(cld))
1836                 rc = mgc_process_cfg_log(mgc, cld, rcl != 0);
1837
1838         CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
1839                mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
1840         if (rc != -ETIMEDOUT && rc != -EIO && rc != -EAGAIN) {
1841                 cld->cld_processed = 1;
1842                 wake_up(&rq_waitq);
1843         }
1844
1845         /* Now drop the lock so MGS can revoke it */
1846         if (!rcl) {
1847                 rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, LCK_CR, &lockh);
1848                 if (rcl)
1849                         CERROR("Can't drop cfg lock: %d\n", rcl);
1850         }
1851         mutex_unlock(&cld->cld_lock);
1852
1853         /* requeue nodemap lock immediately if transfer was interrupted */
1854         if ((cld_is_nodemap(cld) && rc == -EAGAIN) ||
1855             (cld_is_recover(cld) && rc)) {
1856                 if (cld_is_recover(cld))
1857                         CWARN("%s: IR log %s failed, not fatal: rc = %d\n",
1858                               mgc->obd_name, cld->cld_logname, rc);
1859                 mgc_requeue_add(cld);
1860                 rc = 0;
1861         }
1862
1863         RETURN(rc);
1864 }
1865
1866
1867 /* Called from lustre_process_log.
1868  * LCFG_LOG_START gets the config log from the MGS, processes it to start
1869  * any services, and adds it to the list logs to watch (follow).
1870  */
1871 static int mgc_process_config(struct obd_device *obd, size_t len, void *buf)
1872 {
1873         struct lustre_cfg *lcfg = buf;
1874         struct config_llog_instance *cfg = NULL;
1875         char *logname;
1876         int rc;
1877
1878         ENTRY;
1879 #ifdef HAVE_SERVER_SUPPORT
1880         rc = mgc_process_config_server(obd, len, buf);
1881         if (rc != -ENOENT)
1882                 RETURN(rc);
1883 #endif
1884
1885         switch (lcfg->lcfg_command) {
1886         case LCFG_SPTLRPC_CONF: {
1887                 rc = sptlrpc_process_config(lcfg);
1888                 break;
1889         }
1890         case LCFG_LOG_START: {
1891                 struct config_llog_data *cld;
1892                 struct super_block *sb;
1893
1894                 logname = lustre_cfg_string(lcfg, 1);
1895                 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
1896                 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
1897
1898                 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
1899                        cfg->cfg_last_idx);
1900
1901                 /* We're only called through here on the initial mount */
1902                 cld = config_log_add(obd, logname, cfg, sb);
1903                 if (IS_ERR(cld)) {
1904                         rc = PTR_ERR(cld);
1905                         break;
1906                 }
1907
1908                 /* if it exists, the sptlrpc config log really needs to be
1909                  * correctly processed before processing other logs,
1910                  * otherwise client might use incorrect sec flavor
1911                  */
1912                 if (cld->cld_sptlrpc && !cld->cld_sptlrpc->cld_processed) {
1913                         unsigned int timeout = 120;
1914
1915                         /* we do not want to wait forever,
1916                          * we prefer a (excessively) long timeout
1917                          */
1918                         timeout = max(20 * mgc_requeue_timeout_min, timeout);
1919                         wait_event_idle_timeout(rq_waitq,
1920                                                 cld->cld_sptlrpc->cld_processed,
1921                                                 cfs_time_seconds(timeout));
1922                 }
1923
1924                 rc = mgc_process_log(obd, cld);
1925                 if (rc == 0 && cld->cld_recover != NULL) {
1926                         if (OCD_HAS_FLAG(&obd->u.cli.cl_import->
1927                                          imp_connect_data, IMP_RECOV)) {
1928                                 rc = mgc_process_log(obd, cld->cld_recover);
1929                         } else {
1930                                 struct config_llog_data *cir;
1931
1932                                 mutex_lock(&cld->cld_lock);
1933                                 cir = cld->cld_recover;
1934                                 cld->cld_recover = NULL;
1935                                 mutex_unlock(&cld->cld_lock);
1936                                 config_log_put(cir);
1937                         }
1938
1939                         if (rc)
1940                                 CERROR("Cannot process recover llog %d\n", rc);
1941                 }
1942
1943                 if (rc == 0 && cld->cld_params != NULL) {
1944                         rc = mgc_process_log(obd, cld->cld_params);
1945                         if (rc == -ENOENT) {
1946                                 CDEBUG(D_MGC,
1947                                        "There is no params config file yet\n");
1948                                 rc = 0;
1949                         }
1950                         /* params log is optional */
1951                         if (rc)
1952                                 CERROR("%s: can't process params llog: rc = %d\n",
1953                                        obd->obd_name, rc);
1954                 }
1955
1956                 break;
1957         }
1958         case LCFG_LOG_END: {
1959                 logname = lustre_cfg_string(lcfg, 1);
1960
1961                 if (lcfg->lcfg_bufcount >= 2)
1962                         cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
1963                 rc = config_log_end(logname, cfg);
1964                 break;
1965         }
1966         default:
1967                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1968                 rc = -EINVAL;
1969                 break;
1970         }
1971
1972         RETURN(rc);
1973 }
1974
1975 static const struct obd_ops mgc_obd_ops = {
1976         .o_owner        = THIS_MODULE,
1977         .o_setup        = mgc_setup,
1978         .o_precleanup   = mgc_precleanup,
1979         .o_cleanup      = mgc_cleanup,
1980         .o_add_conn     = client_import_add_conn,
1981         .o_del_conn     = client_import_del_conn,
1982         .o_connect      = client_connect_import,
1983         .o_disconnect   = client_disconnect_export,
1984         .o_set_info_async = mgc_set_info_async,
1985         .o_get_info       = mgc_get_info,
1986         .o_import_event = mgc_import_event,
1987         .o_process_config = mgc_process_config,
1988 };
1989
1990 static int mgc_param_requeue_timeout_min_set(const char *val,
1991                                      cfs_kernel_param_arg_t *kp)
1992 {
1993         int rc;
1994         unsigned int num;
1995
1996         rc = kstrtouint(val, 0, &num);
1997         if (rc < 0)
1998                 return rc;
1999         if (num > 120)
2000                 return -EINVAL;
2001
2002         mgc_requeue_timeout_min = num;
2003
2004         return 0;
2005 }
2006
2007 static const struct kernel_param_ops param_ops_requeue_timeout_min = {
2008         .set = mgc_param_requeue_timeout_min_set,
2009         .get = param_get_uint,
2010 };
2011
2012 #define param_check_requeue_timeout_min(name, p) \
2013                 __param_check(name, p, unsigned int)
2014
2015 unsigned int mgc_requeue_timeout_min = MGC_TIMEOUT_MIN_SECONDS;
2016 #ifdef HAVE_KERNEL_PARAM_OPS
2017 module_param(mgc_requeue_timeout_min, requeue_timeout_min, 0644);
2018 #else
2019 module_param_call(mgc_requeue_timeout_min, mgc_param_requeue_timeout_min_set,
2020                   param_get_uint, &param_ops_requeue_timeout_min, 0644);
2021 #endif
2022 MODULE_PARM_DESC(mgc_requeue_timeout_min, "Minimal requeue time to refresh logs");
2023
2024 static int __init mgc_init(void)
2025 {
2026         int rc;
2027
2028         rc = libcfs_setup();
2029         if (rc)
2030                 return rc;
2031
2032         return class_register_type(&mgc_obd_ops, NULL, false,
2033                                    LUSTRE_MGC_NAME, NULL);
2034 }
2035
2036 static void __exit mgc_exit(void)
2037 {
2038         class_unregister_type(LUSTRE_MGC_NAME);
2039 }
2040
2041 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2042 MODULE_DESCRIPTION("Lustre Management Client");
2043 MODULE_VERSION(LUSTRE_VERSION_STRING);
2044 MODULE_LICENSE("GPL");
2045
2046 module_init(mgc_init);
2047 module_exit(mgc_exit);