lustre/mgc/mgc_request.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  *
  32  * Copyright (c) 2011, Whamcloud, Inc.
  33  */
  34 /*
  35  * This file is part of Lustre, http://www.lustre.org/
  36  * Lustre is a trademark of Sun Microsystems, Inc.
  37  *
  38  * lustre/mgc/mgc_request.c
  39  *
  40  * Author: Nathan Rutman <nathan@clusterfs.com>
  41  */
  42
  43 #ifndef EXPORT_SYMTAB
  44 # define EXPORT_SYMTAB
  45 #endif
  46 #define DEBUG_SUBSYSTEM S_MGC
  47 #define D_MGC D_CONFIG /*|D_WARNING*/
  48
  49 #ifdef __KERNEL__
  50 # include <linux/module.h>
  51 # include <linux/pagemap.h>
  52 # include <linux/miscdevice.h>
  53 # include <linux/init.h>
  54 #else
  55 # include <liblustre.h>
  56 #endif
  57
  58 #include <obd_class.h>
  59 #include <lustre_dlm.h>
  60 #include <lprocfs_status.h>
  61 #include <lustre_log.h>
  62 #include <lustre_fsfilt.h>
  63 #include <lustre_disk.h>
  64 #include "mgc_internal.h"
  65
  66 static int mgc_name2resid(char *name, int len, struct ldlm_res_id *res_id,
  67                           int type)
  68 {
  69         __u64 resname = 0;
  70
  71         if (len > 8) {
  72                 CERROR("name too long: %s\n", name);
  73                 return -EINVAL;
  74         }
  75         if (len <= 0) {
  76                 CERROR("missing name: %s\n", name);
  77                 return -EINVAL;
  78         }
  79         memcpy(&resname, name, len);
  80
  81         /* Always use the same endianness for the resid */
  82         memset(res_id, 0, sizeof(*res_id));
  83         res_id->name[0] = cpu_to_le64(resname);
  84         /* XXX: unfortunately, sptlprc and config llog share one lock */
  85         switch(type) {
  86         case CONFIG_T_CONFIG:
  87         case CONFIG_T_SPTLRPC:
  88                 resname = 0;
  89                 break;
  90         case CONFIG_T_RECOVER:
  91                 resname = type;
  92                 break;
  93         default:
  94                 LBUG();
  95         }
  96         res_id->name[1] = cpu_to_le64(resname);
  97         CDEBUG(D_MGC, "log %s to resid "LPX64"/"LPX64" (%.8s)\n", name,
  98                res_id->name[0], res_id->name[1], (char *)&res_id->name[0]);
  99         return 0;
 100 }
 101
 102 int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type)
 103 {
 104         /* fsname is at most 8 chars long, maybe contain "-".
 105          * e.g. "lustre", "SUN-000" */
 106         return mgc_name2resid(fsname, strlen(fsname), res_id, type);
 107 }
 108 EXPORT_SYMBOL(mgc_fsname2resid);
 109
 110 int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id, int type)
 111 {
 112         char *name_end;
 113         int len;
 114
 115         /* logname consists of "fsname-nodetype".
 116          * e.g. "lustre-MDT0001", "SUN-000-client" */
 117         name_end = strrchr(logname, '-');
 118         LASSERT(name_end);
 119         len = name_end - logname;
 120         return mgc_name2resid(logname, len, res_id, type);
 121 }
 122
 123 /********************** config llog list **********************/
 124 static CFS_LIST_HEAD(config_llog_list);
 125 static cfs_spinlock_t config_list_lock = CFS_SPIN_LOCK_UNLOCKED;
 126
 127 /* Take a reference to a config log */
 128 static int config_log_get(struct config_llog_data *cld)
 129 {
 130         ENTRY;
 131         cfs_atomic_inc(&cld->cld_refcount);
 132         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
 133                cfs_atomic_read(&cld->cld_refcount));
 134         RETURN(0);
 135 }
 136
 137 /* Drop a reference to a config log.  When no longer referenced,
 138    we can free the config log data */
 139 static void config_log_put(struct config_llog_data *cld)
 140 {
 141         ENTRY;
 142
 143         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
 144                cfs_atomic_read(&cld->cld_refcount));
 145         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
 146
 147         /* spinlock to make sure no item with 0 refcount in the list */
 148         if (cfs_atomic_dec_and_lock(&cld->cld_refcount, &config_list_lock)) {
 149                 cfs_list_del(&cld->cld_list_chain);
 150                 cfs_spin_unlock(&config_list_lock);
 151
 152                 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
 153
 154                 if (cld->cld_recover)
 155                         config_log_put(cld->cld_recover);
 156                 if (cld->cld_sptlrpc)
 157                         config_log_put(cld->cld_sptlrpc);
 158                 if (cld_is_sptlrpc(cld))
 159                         sptlrpc_conf_log_stop(cld->cld_logname);
 160
 161                 class_export_put(cld->cld_mgcexp);
 162                 OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1);
 163         }
 164
 165         EXIT;
 166 }
 167
 168 /* Find a config log by name */
 169 static
 170 struct config_llog_data *config_log_find(char *logname,
 171                                          struct config_llog_instance *cfg)
 172 {
 173         struct config_llog_data *cld;
 174         struct config_llog_data *found = NULL;
 175         void *                   instance;
 176         ENTRY;
 177
 178         LASSERT(logname != NULL);
 179
 180         instance = cfg ? cfg->cfg_instance : NULL;
 181         cfs_spin_lock(&config_list_lock);
 182         cfs_list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 183                 /* check if instance equals */
 184                 if (instance != cld->cld_cfg.cfg_instance)
 185                         continue;
 186
 187                 /* instance may be NULL, should check name */
 188                 if (strcmp(logname, cld->cld_logname) == 0) {
 189                         found = cld;
 190                         break;
 191                 }
 192         }
 193         if (found) {
 194                 cfs_atomic_inc(&found->cld_refcount);
 195                 LASSERT(found->cld_stopping == 0 || cld_is_sptlrpc(found) == 0);
 196         }
 197         cfs_spin_unlock(&config_list_lock);
 198         RETURN(found);
 199 }
 200
 201 static
 202 struct config_llog_data *do_config_log_add(struct obd_device *obd,
 203                                            char *logname,
 204                                            int type,
 205                                            struct config_llog_instance *cfg,
 206                                            struct super_block *sb)
 207 {
 208         struct config_llog_data *cld;
 209         int                      rc;
 210         ENTRY;
 211
 212         CDEBUG(D_MGC, "do adding config log %s:%p\n", logname,
 213                cfg ? cfg->cfg_instance : 0);
 214
 215         OBD_ALLOC(cld, sizeof(*cld) + strlen(logname) + 1);
 216         if (!cld)
 217                 RETURN(ERR_PTR(-ENOMEM));
 218
 219         strcpy(cld->cld_logname, logname);
 220         if (cfg)
 221                 cld->cld_cfg = *cfg;
 222         cfs_mutex_init(&cld->cld_lock);
 223         cld->cld_cfg.cfg_last_idx = 0;
 224         cld->cld_cfg.cfg_flags = 0;
 225         cld->cld_cfg.cfg_sb = sb;
 226         cld->cld_type = type;
 227         cfs_atomic_set(&cld->cld_refcount, 1);
 228
 229         /* Keep the mgc around until we are done */
 230         cld->cld_mgcexp = class_export_get(obd->obd_self_export);
 231
 232         if (cld_is_sptlrpc(cld)) {
 233                 sptlrpc_conf_log_start(logname);
 234                 cld->cld_cfg.cfg_obdname = obd->obd_name;
 235         }
 236
 237         rc = mgc_logname2resid(logname, &cld->cld_resid, type);
 238
 239         cfs_spin_lock(&config_list_lock);
 240         cfs_list_add(&cld->cld_list_chain, &config_llog_list);
 241         cfs_spin_unlock(&config_list_lock);
 242
 243         if (rc) {
 244                 config_log_put(cld);
 245                 RETURN(ERR_PTR(rc));
 246         }
 247
 248         if (cld_is_sptlrpc(cld)) {
 249                 rc = mgc_process_log(obd, cld);
 250                 if (rc)
 251                         CERROR("failed processing sptlrpc log: %d\n", rc);
 252         }
 253
 254         RETURN(cld);
 255 }
 256
 257 static struct config_llog_data *config_recover_log_add(struct obd_device *obd,
 258         char *fsname,
 259         struct config_llog_instance *cfg,
 260         struct super_block *sb)
 261 {
 262         struct config_llog_instance lcfg = *cfg;
 263         struct lustre_sb_info *lsi = s2lsi(sb);
 264         struct config_llog_data *cld;
 265         char logname[32];
 266
 267         if ((lsi->lsi_flags & LSI_SERVER) && !IS_MDT(lsi->lsi_ldd))
 268                 return NULL;
 269
 270         /* we have to use different llog for clients and mdts for cmd
 271          * where only clients are notified if one of cmd server restarts */
 272         LASSERT(strlen(fsname) < sizeof(logname) / 2);
 273         strcpy(logname, fsname);
 274         if (lsi->lsi_flags & LSI_SERVER) { /* mdt */
 275                 LASSERT(lcfg.cfg_instance == NULL);
 276                 lcfg.cfg_instance = sb;
 277                 strcat(logname, "-mdtir");
 278         } else {
 279                 LASSERT(lcfg.cfg_instance != NULL);
 280                 strcat(logname, "-cliir");
 281         }
 282
 283         cld = do_config_log_add(obd, logname, CONFIG_T_RECOVER, &lcfg, sb);
 284         return cld;
 285 }
 286
 287
 288 /** Add this log to the list of active logs watched by an MGC.
 289  * Active means we're watching for updates.
 290  * We have one active log per "mount" - client instance or servername.
 291  * Each instance may be at a different point in the log.
 292  */
 293 static int config_log_add(struct obd_device *obd, char *logname,
 294                           struct config_llog_instance *cfg,
 295                           struct super_block *sb)
 296 {
 297         struct lustre_sb_info *lsi = s2lsi(sb);
 298         struct config_llog_data *cld;
 299         struct config_llog_data *sptlrpc_cld;
 300         char                     seclogname[32];
 301         char                    *ptr;
 302         ENTRY;
 303
 304         CDEBUG(D_MGC, "adding config log %s:%p\n", logname, cfg->cfg_instance);
 305
 306         /*
 307          * for each regular log, the depended sptlrpc log name is
 308          * <fsname>-sptlrpc. multiple regular logs may share one sptlrpc log.
 309          */
 310         ptr = strrchr(logname, '-');
 311         if (ptr == NULL || ptr - logname > 8) {
 312                 CERROR("logname %s is too long\n", logname);
 313                 RETURN(-EINVAL);
 314         }
 315
 316         memcpy(seclogname, logname, ptr - logname);
 317         strcpy(seclogname + (ptr - logname), "-sptlrpc");
 318
 319         sptlrpc_cld = config_log_find(seclogname, NULL);
 320         if (sptlrpc_cld == NULL) {
 321                 sptlrpc_cld = do_config_log_add(obd, seclogname,
 322                                                 CONFIG_T_SPTLRPC, NULL, NULL);
 323                 if (IS_ERR(sptlrpc_cld)) {
 324                         CERROR("can't create sptlrpc log: %s\n", seclogname);
 325                         RETURN(PTR_ERR(sptlrpc_cld));
 326                 }
 327         }
 328
 329         cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb);
 330         if (IS_ERR(cld)) {
 331                 CERROR("can't create log: %s\n", logname);
 332                 config_log_put(sptlrpc_cld);
 333                 RETURN(PTR_ERR(cld));
 334         }
 335
 336         cld->cld_sptlrpc = sptlrpc_cld;
 337
 338         LASSERT(lsi->lsi_lmd);
 339         if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR)) {
 340                 struct config_llog_data *recover_cld;
 341                 *strrchr(seclogname, '-') = 0;
 342                 recover_cld = config_recover_log_add(obd, seclogname, cfg, sb);
 343                 if (IS_ERR(recover_cld)) {
 344                         config_log_put(cld);
 345                         RETURN(PTR_ERR(recover_cld));
 346                 }
 347                 cld->cld_recover = recover_cld;
 348         }
 349
 350         RETURN(0);
 351 }
 352
 353 CFS_DECLARE_MUTEX(llog_process_lock);
 354
 355 /** Stop watching for updates on this log.
 356  */
 357 static int config_log_end(char *logname, struct config_llog_instance *cfg)
 358 {
 359         struct config_llog_data *cld;
 360         struct config_llog_data *cld_sptlrpc = NULL;
 361         struct config_llog_data *cld_recover = NULL;
 362         int rc = 0;
 363         ENTRY;
 364
 365         cld = config_log_find(logname, cfg);
 366         if (cld == NULL)
 367                 RETURN(-ENOENT);
 368
 369         cfs_mutex_lock(&cld->cld_lock);
 370         /*
 371          * if cld_stopping is set, it means we didn't start the log thus
 372          * not owning the start ref. this can happen after previous umount:
 373          * the cld still hanging there waiting for lock cancel, and we
 374          * remount again but failed in the middle and call log_end without
 375          * calling start_log.
 376          */
 377         if (unlikely(cld->cld_stopping)) {
 378                 cfs_mutex_unlock(&cld->cld_lock);
 379                 /* drop the ref from the find */
 380                 config_log_put(cld);
 381                 RETURN(rc);
 382         }
 383
 384         cld->cld_stopping = 1;
 385
 386         cld_recover = cld->cld_recover;
 387         cld->cld_recover = NULL;
 388         cfs_mutex_unlock(&cld->cld_lock);
 389
 390         if (cld_recover) {
 391                 cfs_mutex_lock(&cld_recover->cld_lock);
 392                 cld_recover->cld_stopping = 1;
 393                 cfs_mutex_unlock(&cld_recover->cld_lock);
 394                 config_log_put(cld_recover);
 395         }
 396
 397         cfs_spin_lock(&config_list_lock);
 398         cld_sptlrpc = cld->cld_sptlrpc;
 399         cld->cld_sptlrpc = NULL;
 400         cfs_spin_unlock(&config_list_lock);
 401
 402         if (cld_sptlrpc)
 403                 config_log_put(cld_sptlrpc);
 404
 405         /* drop the ref from the find */
 406         config_log_put(cld);
 407         /* drop the start ref */
 408         config_log_put(cld);
 409
 410         CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
 411                rc);
 412         RETURN(rc);
 413 }
 414
 415 int lprocfs_mgc_rd_ir_state(char *page, char **start, off_t off,
 416                             int count, int *eof, void *data)
 417 {
 418         struct obd_device       *obd = data;
 419         struct obd_import       *imp = obd->u.cli.cl_import;
 420         struct obd_connect_data *ocd = &imp->imp_connect_data;
 421         struct config_llog_data *cld;
 422         int rc = 0;
 423         ENTRY;
 424
 425         rc = snprintf(page, count, "imperative_recovery: %s\n",
 426                       OCD_HAS_FLAG(ocd, IMP_RECOV) ? "ON" : "OFF");
 427         rc += snprintf(page + rc, count - rc, "client_state:\n");
 428
 429         cfs_spin_lock(&config_list_lock);
 430         cfs_list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
 431                 if (cld->cld_recover == NULL)
 432                         continue;
 433                 rc += snprintf(page + rc, count - rc,
 434                                "    - { client: %s, nidtbl_version: %u }\n",
 435                                cld->cld_logname,
 436                                cld->cld_recover->cld_cfg.cfg_last_idx);
 437         }
 438         cfs_spin_unlock(&config_list_lock);
 439
 440         RETURN(rc);
 441 }
 442
 443 /* reenqueue any lost locks */
 444 #define RQ_RUNNING 0x1
 445 #define RQ_NOW     0x2
 446 #define RQ_LATER   0x4
 447 #define RQ_STOP    0x8
 448 static int                    rq_state = 0;
 449 static cfs_waitq_t            rq_waitq;
 450 static CFS_DECLARE_COMPLETION(rq_exit);
 451
 452 static void do_requeue(struct config_llog_data *cld)
 453 {
 454         ENTRY;
 455         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
 456
 457         /* Do not run mgc_process_log on a disconnected export or an
 458            export which is being disconnected. Take the client
 459            semaphore to make the check non-racy. */
 460         cfs_down_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
 461         if (cld->cld_mgcexp->exp_obd->u.cli.cl_conn_count != 0) {
 462                 CDEBUG(D_MGC, "updating log %s\n", cld->cld_logname);
 463                 mgc_process_log(cld->cld_mgcexp->exp_obd, cld);
 464         } else {
 465                 CDEBUG(D_MGC, "disconnecting, won't update log %s\n",
 466                        cld->cld_logname);
 467         }
 468         cfs_up_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
 469
 470         EXIT;
 471 }
 472
 473 /* this timeout represents how many seconds MGC should wait before
 474  * requeue config and recover lock to the MGS. We need to randomize this
 475  * in order to not flood the MGS.
 476  */
 477 #define MGC_TIMEOUT_MIN_SECONDS   5
 478 #define MGC_TIMEOUT_RAND_CENTISEC 0x1ff /* ~500 */
 479
 480 static int mgc_requeue_thread(void *data)
 481 {
 482         char name[] = "ll_cfg_requeue";
 483         int rc = 0;
 484         ENTRY;
 485
 486         cfs_daemonize(name);
 487
 488         CDEBUG(D_MGC, "Starting requeue thread\n");
 489
 490         /* Keep trying failed locks periodically */
 491         cfs_spin_lock(&config_list_lock);
 492         rq_state |= RQ_RUNNING;
 493         while (1) {
 494                 struct l_wait_info lwi;
 495                 struct config_llog_data *cld, *cld_prev;
 496                 int rand = cfs_rand() & MGC_TIMEOUT_RAND_CENTISEC;
 497                 int stopped = !!(rq_state & RQ_STOP);
 498                 int to;
 499
 500                 /* Any new or requeued lostlocks will change the state */
 501                 rq_state &= ~(RQ_NOW | RQ_LATER);
 502                 cfs_spin_unlock(&config_list_lock);
 503
 504                 /* Always wait a few seconds to allow the server who
 505                    caused the lock revocation to finish its setup, plus some
 506                    random so everyone doesn't try to reconnect at once. */
 507                 to = MGC_TIMEOUT_MIN_SECONDS * CFS_HZ;
 508                 to += rand * CFS_HZ / 100; /* rand is centi-seconds */
 509                 lwi = LWI_TIMEOUT(to, NULL, NULL);
 510                 l_wait_event(rq_waitq, rq_state & RQ_STOP, &lwi);
 511
 512                 /*
 513                  * iterate & processing through the list. for each cld, process
 514                  * its depending sptlrpc cld firstly (if any) and then itself.
 515                  *
 516                  * it's guaranteed any item in the list must have
 517                  * reference > 0; and if cld_lostlock is set, at
 518                  * least one reference is taken by the previous enqueue.
 519                  */
 520                 cld_prev = NULL;
 521
 522                 cfs_spin_lock(&config_list_lock);
 523                 cfs_list_for_each_entry(cld, &config_llog_list,
 524                                         cld_list_chain) {
 525                         if (!cld->cld_lostlock)
 526                                 continue;
 527
 528                         cfs_spin_unlock(&config_list_lock);
 529
 530                         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
 531
 532                         /* Whether we enqueued again or not in mgc_process_log,
 533                          * we're done with the ref from the old enqueue */
 534                         if (cld_prev)
 535                                 config_log_put(cld_prev);
 536                         cld_prev = cld;
 537
 538                         cld->cld_lostlock = 0;
 539                         if (likely(!stopped))
 540                                 do_requeue(cld);
 541
 542                         cfs_spin_lock(&config_list_lock);
 543                 }
 544                 cfs_spin_unlock(&config_list_lock);
 545                 if (cld_prev)
 546                         config_log_put(cld_prev);
 547
 548                 /* break after scanning the list so that we can drop
 549                  * refcount to losing lock clds */
 550                 if (unlikely(stopped)) {
 551                         cfs_spin_lock(&config_list_lock);
 552                         break;
 553                 }
 554
 555                 /* Wait a bit to see if anyone else needs a requeue */
 556                 lwi = (struct l_wait_info) { 0 };
 557                 l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP),
 558                              &lwi);
 559                 cfs_spin_lock(&config_list_lock);
 560         }
 561         /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
 562         rq_state &= ~RQ_RUNNING;
 563         cfs_spin_unlock(&config_list_lock);
 564
 565         cfs_complete(&rq_exit);
 566
 567         CDEBUG(D_MGC, "Ending requeue thread\n");
 568         RETURN(rc);
 569 }
 570
 571 /* Add a cld to the list to requeue.  Start the requeue thread if needed.
 572    We are responsible for dropping the config log reference from here on out. */
 573 static void mgc_requeue_add(struct config_llog_data *cld)
 574 {
 575         ENTRY;
 576
 577         CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n",
 578                cld->cld_logname, cfs_atomic_read(&cld->cld_refcount),
 579                cld->cld_stopping, rq_state);
 580         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
 581
 582         cfs_mutex_lock(&cld->cld_lock);
 583         if (cld->cld_stopping || cld->cld_lostlock) {
 584                 cfs_mutex_unlock(&cld->cld_lock);
 585                 RETURN_EXIT;
 586         }
 587         /* this refcount will be released in mgc_requeue_thread. */
 588         config_log_get(cld);
 589         cld->cld_lostlock = 1;
 590         cfs_mutex_unlock(&cld->cld_lock);
 591
 592         /* Hold lock for rq_state */
 593         cfs_spin_lock(&config_list_lock);
 594         if (rq_state & RQ_STOP) {
 595                 cfs_spin_unlock(&config_list_lock);
 596                 cld->cld_lostlock = 0;
 597                 config_log_put(cld);
 598         } else {
 599                 rq_state |= RQ_NOW;
 600                 cfs_spin_unlock(&config_list_lock);
 601                 cfs_waitq_signal(&rq_waitq);
 602         }
 603         EXIT;
 604 }
 605
 606 /********************** class fns **********************/
 607
 608 static int mgc_fs_setup(struct obd_device *obd, struct super_block *sb,
 609                         struct vfsmount *mnt)
 610 {
 611         struct lvfs_run_ctxt saved;
 612         struct lustre_sb_info *lsi = s2lsi(sb);
 613         struct client_obd *cli = &obd->u.cli;
 614         struct dentry *dentry;
 615         char *label;
 616         int err = 0;
 617         ENTRY;
 618
 619         LASSERT(lsi);
 620         LASSERT(lsi->lsi_srv_mnt == mnt);
 621
 622         /* The mgc fs exclusion sem. Only one fs can be setup at a time. */
 623         cfs_down(&cli->cl_mgc_sem);
 624
 625         cfs_cleanup_group_info();
 626
 627         obd->obd_fsops = fsfilt_get_ops(MT_STR(lsi->lsi_ldd));
 628         if (IS_ERR(obd->obd_fsops)) {
 629                 cfs_up(&cli->cl_mgc_sem);
 630                 CERROR("No fstype %s rc=%ld\n", MT_STR(lsi->lsi_ldd),
 631                        PTR_ERR(obd->obd_fsops));
 632                 RETURN(PTR_ERR(obd->obd_fsops));
 633         }
 634
 635         cli->cl_mgc_vfsmnt = mnt;
 636         fsfilt_setup(obd, mnt->mnt_sb);
 637
 638         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
 639         obd->obd_lvfs_ctxt.pwdmnt = mnt;
 640         obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
 641         obd->obd_lvfs_ctxt.fs = get_ds();
 642
 643         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 644         dentry = ll_lookup_one_len(MOUNT_CONFIGS_DIR, cfs_fs_pwd(current->fs),
 645                                    strlen(MOUNT_CONFIGS_DIR));
 646         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 647         if (IS_ERR(dentry)) {
 648                 err = PTR_ERR(dentry);
 649                 CERROR("cannot lookup %s directory: rc = %d\n",
 650                        MOUNT_CONFIGS_DIR, err);
 651                 GOTO(err_ops, err);
 652         }
 653         cli->cl_mgc_configs_dir = dentry;
 654
 655         /* We take an obd ref to insure that we can't get to mgc_cleanup
 656            without calling mgc_fs_cleanup first. */
 657         class_incref(obd, "mgc_fs", obd);
 658
 659         label = fsfilt_get_label(obd, mnt->mnt_sb);
 660         if (label)
 661                 CDEBUG(D_MGC, "MGC using disk labelled=%s\n", label);
 662
 663         /* We keep the cl_mgc_sem until mgc_fs_cleanup */
 664         RETURN(0);
 665
 666 err_ops:
 667         fsfilt_put_ops(obd->obd_fsops);
 668         obd->obd_fsops = NULL;
 669         cli->cl_mgc_vfsmnt = NULL;
 670         cfs_up(&cli->cl_mgc_sem);
 671         RETURN(err);
 672 }
 673
 674 static int mgc_fs_cleanup(struct obd_device *obd)
 675 {
 676         struct client_obd *cli = &obd->u.cli;
 677         int rc = 0;
 678         ENTRY;
 679
 680         LASSERT(cli->cl_mgc_vfsmnt != NULL);
 681
 682         if (cli->cl_mgc_configs_dir != NULL) {
 683                 struct lvfs_run_ctxt saved;
 684                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 685                 l_dput(cli->cl_mgc_configs_dir);
 686                 cli->cl_mgc_configs_dir = NULL;
 687                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 688                 class_decref(obd, "mgc_fs", obd);
 689         }
 690
 691         cli->cl_mgc_vfsmnt = NULL;
 692         if (obd->obd_fsops)
 693                 fsfilt_put_ops(obd->obd_fsops);
 694
 695         cfs_up(&cli->cl_mgc_sem);
 696
 697         RETURN(rc);
 698 }
 699
 700 static cfs_atomic_t mgc_count = CFS_ATOMIC_INIT(0);
 701 static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
 702 {
 703         int rc = 0;
 704         ENTRY;
 705
 706         switch (stage) {
 707         case OBD_CLEANUP_EARLY:
 708                 break;
 709         case OBD_CLEANUP_EXPORTS:
 710                 if (cfs_atomic_dec_and_test(&mgc_count)) {
 711                         int running;
 712                         /* stop requeue thread */
 713                         cfs_spin_lock(&config_list_lock);
 714                         running = rq_state & RQ_RUNNING;
 715                         if (running)
 716                                 rq_state |= RQ_STOP;
 717                         cfs_spin_unlock(&config_list_lock);
 718                         if (running) {
 719                                 cfs_waitq_signal(&rq_waitq);
 720                                 cfs_wait_for_completion(&rq_exit);
 721                         }
 722                 }
 723                 obd_cleanup_client_import(obd);
 724                 rc = obd_llog_finish(obd, 0);
 725                 if (rc != 0)
 726                         CERROR("failed to cleanup llogging subsystems\n");
 727                 break;
 728         }
 729         RETURN(rc);
 730 }
 731
 732 static int mgc_cleanup(struct obd_device *obd)
 733 {
 734         struct client_obd *cli = &obd->u.cli;
 735         int rc;
 736         ENTRY;
 737
 738         LASSERT(cli->cl_mgc_vfsmnt == NULL);
 739
 740         /* COMPAT_146 - old config logs may have added profiles we don't
 741            know about */
 742         if (obd->obd_type->typ_refcnt <= 1)
 743                 /* Only for the last mgc */
 744                 class_del_profiles();
 745
 746         lprocfs_obd_cleanup(obd);
 747         ptlrpcd_decref();
 748
 749         rc = client_obd_cleanup(obd);
 750         RETURN(rc);
 751 }
 752
 753 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 754 {
 755         struct lprocfs_static_vars lvars;
 756         int rc;
 757         ENTRY;
 758
 759         ptlrpcd_addref();
 760
 761         rc = client_obd_setup(obd, lcfg);
 762         if (rc)
 763                 GOTO(err_decref, rc);
 764
 765         rc = obd_llog_init(obd, &obd->obd_olg, obd, NULL);
 766         if (rc) {
 767                 CERROR("failed to setup llogging subsystems\n");
 768                 GOTO(err_cleanup, rc);
 769         }
 770
 771         lprocfs_mgc_init_vars(&lvars);
 772         lprocfs_obd_setup(obd, lvars.obd_vars);
 773         sptlrpc_lprocfs_cliobd_attach(obd);
 774
 775         if (cfs_atomic_inc_return(&mgc_count) == 1) {
 776                 rq_state = 0;
 777                 cfs_waitq_init(&rq_waitq);
 778
 779                 /* start requeue thread */
 780                 rc = cfs_create_thread(mgc_requeue_thread, NULL,
 781                                        CFS_DAEMON_FLAGS);
 782                 if (rc < 0) {
 783                         CERROR("%s: Cannot start requeue thread (%d),"
 784                                "no more log updates!\n",
 785                                obd->obd_name, rc);
 786                         GOTO(err_cleanup, rc);
 787                 }
 788                 /* rc is the pid of mgc_requeue_thread. */
 789                 rc = 0;
 790         }
 791
 792         RETURN(rc);
 793
 794 err_cleanup:
 795         client_obd_cleanup(obd);
 796 err_decref:
 797         ptlrpcd_decref();
 798         RETURN(rc);
 799 }
 800
 801 /* based on ll_mdc_blocking_ast */
 802 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 803                             void *data, int flag)
 804 {
 805         struct lustre_handle lockh;
 806         struct config_llog_data *cld = (struct config_llog_data *)data;
 807         int rc = 0;
 808         ENTRY;
 809
 810         switch (flag) {
 811         case LDLM_CB_BLOCKING:
 812                 /* mgs wants the lock, give it up... */
 813                 LDLM_DEBUG(lock, "MGC blocking CB");
 814                 ldlm_lock2handle(lock, &lockh);
 815                 rc = ldlm_cli_cancel(&lockh);
 816                 break;
 817         case LDLM_CB_CANCELING:
 818                 /* We've given up the lock, prepare ourselves to update. */
 819                 LDLM_DEBUG(lock, "MGC cancel CB");
 820
 821                 CDEBUG(D_MGC, "Lock res "LPX64" (%.8s)\n",
 822                        lock->l_resource->lr_name.name[0],
 823                        (char *)&lock->l_resource->lr_name.name[0]);
 824
 825                 if (!cld) {
 826                         CDEBUG(D_INFO, "missing data, won't requeue\n");
 827                         break;
 828                 }
 829
 830                 /* held at mgc_process_log(). */
 831                 LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
 832                 /* Are we done with this log? */
 833                 if (cld->cld_stopping) {
 834                         CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
 835                                cld->cld_logname);
 836                         config_log_put(cld);
 837                         break;
 838                 }
 839                 /* Make sure not to re-enqueue when the mgc is stopping
 840                    (we get called from client_disconnect_export) */
 841                 if (!lock->l_conn_export ||
 842                     !lock->l_conn_export->exp_obd->u.cli.cl_conn_count) {
 843                         CDEBUG(D_MGC, "log %.8s: disconnecting, won't requeue\n",
 844                                cld->cld_logname);
 845                         config_log_put(cld);
 846                         break;
 847                 }
 848
 849                 /* Re-enqueue now */
 850                 mgc_requeue_add(cld);
 851                 config_log_put(cld);
 852                 break;
 853         default:
 854                 LBUG();
 855         }
 856
 857         RETURN(rc);
 858 }
 859
 860 /* Not sure where this should go... */
 861 #define  MGC_ENQUEUE_LIMIT 50
 862 #define  MGC_TARGET_REG_LIMIT 10
 863 #define  MGC_SEND_PARAM_LIMIT 10
 864
 865 /* Send parameter to MGS*/
 866 static int mgc_set_mgs_param(struct obd_export *exp,
 867                              struct mgs_send_param *msp)
 868 {
 869         struct ptlrpc_request *req;
 870         struct mgs_send_param *req_msp, *rep_msp;
 871         int rc;
 872         ENTRY;
 873
 874         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
 875                                         &RQF_MGS_SET_INFO, LUSTRE_MGS_VERSION,
 876                                         MGS_SET_INFO);
 877         if (!req)
 878                 RETURN(-ENOMEM);
 879
 880         req_msp = req_capsule_client_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
 881         if (!req_msp) {
 882                 ptlrpc_req_finished(req);
 883                 RETURN(-ENOMEM);
 884         }
 885
 886         memcpy(req_msp, msp, sizeof(*req_msp));
 887         ptlrpc_request_set_replen(req);
 888
 889         /* Limit how long we will wait for the enqueue to complete */
 890         req->rq_delay_limit = MGC_SEND_PARAM_LIMIT;
 891         rc = ptlrpc_queue_wait(req);
 892         if (!rc) {
 893                 rep_msp = req_capsule_server_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
 894                 memcpy(msp, rep_msp, sizeof(*rep_msp));
 895         }
 896
 897         ptlrpc_req_finished(req);
 898
 899         RETURN(rc);
 900 }
 901
 902 /* Take a config lock so we can get cancel notifications */
 903 static int mgc_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm,
 904                        __u32 type, ldlm_policy_data_t *policy, __u32 mode,
 905                        int *flags, void *bl_cb, void *cp_cb, void *gl_cb,
 906                        void *data, __u32 lvb_len, void *lvb_swabber,
 907                        struct lustre_handle *lockh)
 908 {
 909         struct config_llog_data *cld = (struct config_llog_data *)data;
 910         struct ldlm_enqueue_info einfo = { type, mode, mgc_blocking_ast,
 911                          ldlm_completion_ast, NULL, NULL, NULL };
 912         struct ptlrpc_request *req;
 913         int short_limit = cld_is_sptlrpc(cld);
 914         int rc;
 915         ENTRY;
 916
 917         CDEBUG(D_MGC, "Enqueue for %s (res "LPX64")\n", cld->cld_logname,
 918                cld->cld_resid.name[0]);
 919
 920         /* We need a callback for every lockholder, so don't try to
 921            ldlm_lock_match (see rev 1.1.2.11.2.47) */
 922         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
 923                                         &RQF_LDLM_ENQUEUE, LUSTRE_DLM_VERSION,
 924                                         LDLM_ENQUEUE);
 925         if (req == NULL)
 926                 RETURN(-ENOMEM);
 927         ptlrpc_request_set_replen(req);
 928
 929         /* check if this is server or client */
 930         if (cld->cld_cfg.cfg_sb) {
 931                 struct lustre_sb_info *lsi = s2lsi(cld->cld_cfg.cfg_sb);
 932                 if (lsi && (lsi->lsi_flags & LSI_SERVER))
 933                         short_limit = 1;
 934         }
 935         /* Limit how long we will wait for the enqueue to complete */
 936         req->rq_delay_limit = short_limit ? 5 : MGC_ENQUEUE_LIMIT;
 937         rc = ldlm_cli_enqueue(exp, &req, &einfo, &cld->cld_resid, NULL, flags,
 938                               NULL, 0, lockh, 0);
 939         /* A failed enqueue should still call the mgc_blocking_ast,
 940            where it will be requeued if needed ("grant failed"). */
 941         ptlrpc_req_finished(req);
 942         RETURN(rc);
 943 }
 944
 945 static int mgc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
 946                       __u32 mode, struct lustre_handle *lockh)
 947 {
 948         ENTRY;
 949
 950         ldlm_lock_decref(lockh, mode);
 951
 952         RETURN(0);
 953 }
 954
 955 static void mgc_notify_active(struct obd_device *unused)
 956 {
 957         /* wakeup mgc_requeue_thread to requeue mgc lock */
 958         cfs_spin_lock(&config_list_lock);
 959         rq_state |= RQ_NOW;
 960         cfs_spin_unlock(&config_list_lock);
 961         cfs_waitq_signal(&rq_waitq);
 962
 963         /* TODO: Help the MGS rebuild nidtbl. -jay */
 964 }
 965
 966 /* Send target_reg message to MGS */
 967 static int mgc_target_register(struct obd_export *exp,
 968                                struct mgs_target_info *mti)
 969 {
 970         struct ptlrpc_request  *req;
 971         struct mgs_target_info *req_mti, *rep_mti;
 972         int                     rc;
 973         ENTRY;
 974
 975         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
 976                                         &RQF_MGS_TARGET_REG, LUSTRE_MGS_VERSION,
 977                                         MGS_TARGET_REG);
 978         if (req == NULL)
 979                 RETURN(-ENOMEM);
 980
 981         req_mti = req_capsule_client_get(&req->rq_pill, &RMF_MGS_TARGET_INFO);
 982         if (!req_mti) {
 983                 ptlrpc_req_finished(req);
 984                 RETURN(-ENOMEM);
 985         }
 986
 987         memcpy(req_mti, mti, sizeof(*req_mti));
 988         ptlrpc_request_set_replen(req);
 989         CDEBUG(D_MGC, "register %s\n", mti->mti_svname);
 990         /* Limit how long we will wait for the enqueue to complete */
 991         req->rq_delay_limit = MGC_TARGET_REG_LIMIT;
 992
 993         rc = ptlrpc_queue_wait(req);
 994         if (!rc) {
 995                 rep_mti = req_capsule_server_get(&req->rq_pill,
 996                                                  &RMF_MGS_TARGET_INFO);
 997                 memcpy(mti, rep_mti, sizeof(*rep_mti));
 998                 CDEBUG(D_MGC, "register %s got index = %d\n",
 999                        mti->mti_svname, mti->mti_stripe_index);
1000         }
1001         ptlrpc_req_finished(req);
1002
1003         RETURN(rc);
1004 }
1005
1006 int mgc_set_info_async(struct obd_export *exp, obd_count keylen,
1007                        void *key, obd_count vallen, void *val,
1008                        struct ptlrpc_request_set *set)
1009 {
1010         int rc = -EINVAL;
1011         ENTRY;
1012
1013         /* Turn off initial_recov after we try all backup servers once */
1014         if (KEY_IS(KEY_INIT_RECOV_BACKUP)) {
1015                 struct obd_import *imp = class_exp2cliimp(exp);
1016                 int value;
1017                 if (vallen != sizeof(int))
1018                         RETURN(-EINVAL);
1019                 value = *(int *)val;
1020                 CDEBUG(D_MGC, "InitRecov %s %d/d%d:i%d:r%d:or%d:%s\n",
1021                        imp->imp_obd->obd_name, value,
1022                        imp->imp_deactive, imp->imp_invalid,
1023                        imp->imp_replayable, imp->imp_obd->obd_replayable,
1024                        ptlrpc_import_state_name(imp->imp_state));
1025                 /* Resurrect if we previously died */
1026                 if ((imp->imp_state != LUSTRE_IMP_FULL &&
1027                      imp->imp_state != LUSTRE_IMP_NEW) || value > 1)
1028                         ptlrpc_reconnect_import(imp);
1029                 RETURN(0);
1030         }
1031         /* FIXME move this to mgc_process_config */
1032         if (KEY_IS(KEY_REGISTER_TARGET)) {
1033                 struct mgs_target_info *mti;
1034                 if (vallen != sizeof(struct mgs_target_info))
1035                         RETURN(-EINVAL);
1036                 mti = (struct mgs_target_info *)val;
1037                 CDEBUG(D_MGC, "register_target %s %#x\n",
1038                        mti->mti_svname, mti->mti_flags);
1039                 rc =  mgc_target_register(exp, mti);
1040                 RETURN(rc);
1041         }
1042         if (KEY_IS(KEY_SET_FS)) {
1043                 struct super_block *sb = (struct super_block *)val;
1044                 struct lustre_sb_info *lsi;
1045                 if (vallen != sizeof(struct super_block))
1046                         RETURN(-EINVAL);
1047                 lsi = s2lsi(sb);
1048                 rc = mgc_fs_setup(exp->exp_obd, sb, lsi->lsi_srv_mnt);
1049                 if (rc) {
1050                         CERROR("set_fs got %d\n", rc);
1051                 }
1052                 RETURN(rc);
1053         }
1054         if (KEY_IS(KEY_CLEAR_FS)) {
1055                 if (vallen != 0)
1056                         RETURN(-EINVAL);
1057                 rc = mgc_fs_cleanup(exp->exp_obd);
1058                 if (rc) {
1059                         CERROR("clear_fs got %d\n", rc);
1060                 }
1061                 RETURN(rc);
1062         }
1063         if (KEY_IS(KEY_SET_INFO)) {
1064                 struct mgs_send_param *msp;
1065
1066                 msp = (struct mgs_send_param *)val;
1067                 rc =  mgc_set_mgs_param(exp, msp);
1068                 RETURN(rc);
1069         }
1070         if (KEY_IS(KEY_MGSSEC)) {
1071                 struct client_obd     *cli = &exp->exp_obd->u.cli;
1072                 struct sptlrpc_flavor  flvr;
1073
1074                 /*
1075                  * empty string means using current flavor, if which haven't
1076                  * been set yet, set it as null.
1077                  *
1078                  * if flavor has been set previously, check the asking flavor
1079                  * must match the existing one.
1080                  */
1081                 if (vallen == 0) {
1082                         if (cli->cl_flvr_mgc.sf_rpc != SPTLRPC_FLVR_INVALID)
1083                                 RETURN(0);
1084                         val = "null";
1085                         vallen = 4;
1086                 }
1087
1088                 rc = sptlrpc_parse_flavor(val, &flvr);
1089                 if (rc) {
1090                         CERROR("invalid sptlrpc flavor %s to MGS\n",
1091                                (char *) val);
1092                         RETURN(rc);
1093                 }
1094
1095                 /*
1096                  * caller already hold a mutex
1097                  */
1098                 if (cli->cl_flvr_mgc.sf_rpc == SPTLRPC_FLVR_INVALID) {
1099                         cli->cl_flvr_mgc = flvr;
1100                 } else if (memcmp(&cli->cl_flvr_mgc, &flvr,
1101                                   sizeof(flvr)) != 0) {
1102                         char    str[20];
1103
1104                         sptlrpc_flavor2name(&cli->cl_flvr_mgc,
1105                                             str, sizeof(str));
1106                         LCONSOLE_ERROR("asking sptlrpc flavor %s to MGS but "
1107                                        "currently %s is in use\n",
1108                                        (char *) val, str);
1109                         rc = -EPERM;
1110                 }
1111                 RETURN(rc);
1112         }
1113
1114         RETURN(rc);
1115 }
1116
1117 static int mgc_get_info(struct obd_export *exp, __u32 keylen, void *key,
1118                         __u32 *vallen, void *val, struct lov_stripe_md *unused)
1119 {
1120         int rc = -EINVAL;
1121
1122         if (KEY_IS(KEY_CONN_DATA)) {
1123                 struct obd_import *imp = class_exp2cliimp(exp);
1124                 struct obd_connect_data *data = val;
1125
1126                 if (*vallen == sizeof(*data)) {
1127                         *data = imp->imp_connect_data;
1128                         rc = 0;
1129                 }
1130         }
1131
1132         return rc;
1133 }
1134
1135 static int mgc_import_event(struct obd_device *obd,
1136                             struct obd_import *imp,
1137                             enum obd_import_event event)
1138 {
1139         int rc = 0;
1140
1141         LASSERT(imp->imp_obd == obd);
1142         CDEBUG(D_MGC, "import event %#x\n", event);
1143
1144         switch (event) {
1145         case IMP_EVENT_DISCON:
1146                 /* MGC imports should not wait for recovery */
1147                 break;
1148         case IMP_EVENT_INACTIVE:
1149                 break;
1150         case IMP_EVENT_INVALIDATE: {
1151                 struct ldlm_namespace *ns = obd->obd_namespace;
1152                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
1153                 break;
1154         }
1155         case IMP_EVENT_ACTIVE:
1156                 LCONSOLE_WARN("%s: Reactivating import\n", obd->obd_name);
1157                 /* Clearing obd_no_recov allows us to continue pinging */
1158                 obd->obd_no_recov = 0;
1159                 mgc_notify_active(obd);
1160                 break;
1161         case IMP_EVENT_OCD:
1162                 break;
1163         case IMP_EVENT_DEACTIVATE:
1164         case IMP_EVENT_ACTIVATE:
1165                 break;
1166         default:
1167                 CERROR("Unknown import event %#x\n", event);
1168                 LBUG();
1169         }
1170         RETURN(rc);
1171 }
1172
1173 static int mgc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
1174                          struct obd_device *tgt, int *index)
1175 {
1176         struct llog_ctxt *ctxt;
1177         int rc;
1178         ENTRY;
1179
1180         LASSERT(olg == &obd->obd_olg);
1181
1182         rc = llog_setup(obd, olg, LLOG_CONFIG_ORIG_CTXT, tgt, 0, NULL,
1183                         &llog_lvfs_ops);
1184         if (rc)
1185                 RETURN(rc);
1186
1187         rc = llog_setup(obd, olg, LLOG_CONFIG_REPL_CTXT, tgt, 0, NULL,
1188                         &llog_client_ops);
1189         if (rc == 0) {
1190                 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
1191                 if (!ctxt) {
1192                         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
1193                         if (ctxt)
1194                                 llog_cleanup(ctxt);
1195                         RETURN(-ENODEV);
1196                 }
1197                 llog_initiator_connect(ctxt);
1198                 llog_ctxt_put(ctxt);
1199         } else {
1200                 ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
1201                 if (ctxt)
1202                         llog_cleanup(ctxt);
1203         }
1204
1205         RETURN(rc);
1206 }
1207
1208 static int mgc_llog_finish(struct obd_device *obd, int count)
1209 {
1210         struct llog_ctxt *ctxt;
1211         int rc = 0, rc2 = 0;
1212         ENTRY;
1213
1214         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
1215         if (ctxt)
1216                 rc = llog_cleanup(ctxt);
1217
1218         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
1219         if (ctxt)
1220                 rc2 = llog_cleanup(ctxt);
1221
1222         if (!rc)
1223                 rc = rc2;
1224
1225         RETURN(rc);
1226 }
1227
1228 enum {
1229         CONFIG_READ_NRPAGES_INIT = 1 << (20 - CFS_PAGE_SHIFT),
1230         CONFIG_READ_NRPAGES      = 4
1231 };
1232
1233 static int mgc_apply_recover_logs(struct obd_device *mgc,
1234                                   struct config_llog_data *cld,
1235                                   __u64 max_version,
1236                                   void *data, int datalen)
1237 {
1238         struct config_llog_instance *cfg = &cld->cld_cfg;
1239         struct lustre_sb_info       *lsi = s2lsi(cfg->cfg_sb);
1240         struct mgs_nidtbl_entry *entry;
1241         struct lustre_cfg       *lcfg;
1242         struct lustre_cfg_bufs   bufs;
1243         u64   prev_version = 0;
1244         char *inst;
1245         char *buf;
1246         int   bufsz;
1247         int   pos;
1248         int   rc  = 0;
1249         int   off = 0;
1250         ENTRY;
1251
1252         LASSERT(cfg->cfg_instance != NULL);
1253         LASSERT(cfg->cfg_sb == cfg->cfg_instance);
1254
1255         OBD_ALLOC(inst, CFS_PAGE_SIZE);
1256         if (inst == NULL)
1257                 RETURN(-ENOMEM);
1258
1259         if (!(lsi->lsi_flags & LSI_SERVER)) {
1260                 pos = sprintf(inst, "%p", cfg->cfg_instance);
1261         } else {
1262                 LASSERT(IS_MDT(lsi->lsi_ldd));
1263                 pos = sprintf(inst, "MDT%04x", lsi->lsi_ldd->ldd_svindex);
1264         }
1265
1266         ++pos;
1267         buf   = inst + pos;
1268         bufsz = CFS_PAGE_SIZE - pos;
1269
1270         while (datalen > 0) {
1271                 int   entry_len = sizeof(*entry);
1272                 int   is_ost;
1273                 struct obd_device *obd;
1274                 char *obdname;
1275                 char *cname;
1276                 char *params;
1277                 char *uuid;
1278
1279                 rc = -EINVAL;
1280                 if (datalen < sizeof(*entry))
1281                         break;
1282
1283                 entry = (typeof(entry))(data + off);
1284
1285                 /* sanity check */
1286                 if (entry->mne_nid_type != 0) /* only support type 0 for ipv4 */
1287                         break;
1288                 if (entry->mne_nid_count == 0) /* at least one nid entry */
1289                         break;
1290                 if (entry->mne_nid_size != sizeof(lnet_nid_t))
1291                         break;
1292
1293                 entry_len += entry->mne_nid_count * entry->mne_nid_size;
1294                 if (datalen < entry_len) /* must have entry_len at least */
1295                         break;
1296
1297                 lustre_swab_mgs_nidtbl_entry(entry);
1298                 LASSERT(entry->mne_length <= CFS_PAGE_SIZE);
1299                 if (entry->mne_length < entry_len)
1300                         break;
1301
1302                 off     += entry->mne_length;
1303                 datalen -= entry->mne_length;
1304                 if (datalen < 0)
1305                         break;
1306
1307                 if (entry->mne_version > max_version) {
1308                         CERROR("entry index(%lld) is over max_index(%lld)\n",
1309                                entry->mne_version, max_version);
1310                         break;
1311                 }
1312
1313                 if (prev_version >= entry->mne_version) {
1314                         CERROR("index unsorted, prev %lld, now %lld\n",
1315                                prev_version, entry->mne_version);
1316                         break;
1317                 }
1318                 prev_version = entry->mne_version;
1319
1320                 /*
1321                  * Write a string with format "nid::instance" to
1322                  * lustre/<osc|mdc>/<target>-<osc|mdc>-<instance>/import.
1323                  */
1324
1325                 is_ost = entry->mne_type == LDD_F_SV_TYPE_OST;
1326                 memset(buf, 0, bufsz);
1327                 obdname = buf;
1328                 pos = 0;
1329
1330                 /* lustre-OST0001-osc-<instance #> */
1331                 strcpy(obdname, cld->cld_logname);
1332                 cname = strrchr(obdname, '-');
1333                 if (cname == NULL) {
1334                         CERROR("mgc %s: invalid logname %s\n",
1335                                mgc->obd_name, obdname);
1336                         break;
1337                 }
1338
1339                 pos = cname - obdname;
1340                 obdname[pos] = 0;
1341                 pos += sprintf(obdname + pos, "-%s%04x",
1342                                   is_ost ? "OST" : "MDT", entry->mne_index);
1343
1344                 cname = is_ost ? "osc" : "mdc",
1345                 pos += sprintf(obdname + pos, "-%s-%s", cname, inst);
1346                 lustre_cfg_bufs_reset(&bufs, obdname);
1347
1348                 /* find the obd by obdname */
1349                 obd = class_name2obd(obdname);
1350                 if (obd == NULL) {
1351                         CDEBUG(D_INFO, "mgc %s: cannot find obdname %s\n",
1352                                mgc->obd_name, obdname);
1353
1354                         /* this is a safe race, when the ost is starting up...*/
1355                         continue;
1356                 }
1357
1358                 /* osc.import = "connection=<Conn UUID>::<target instance>" */
1359                 ++pos;
1360                 params = buf + pos;
1361                 pos += sprintf(params, "%s.import=%s", cname, "connection=");
1362                 uuid = buf + pos;
1363
1364                 /* TODO: iterate all nids to find one */
1365                 /* find uuid by nid */
1366                 rc = client_import_find_conn(obd->u.cli.cl_import,
1367                                              entry->u.nids[0],
1368                                              (struct obd_uuid *)uuid);
1369                 if (rc < 0) {
1370                         CERROR("mgc: cannot find uuid by nid %s\n",
1371                                libcfs_nid2str(entry->u.nids[0]));
1372                         break;
1373                 }
1374
1375                 CDEBUG(D_INFO, "Find uuid %s by nid %s\n",
1376                        uuid, libcfs_nid2str(entry->u.nids[0]));
1377
1378                 pos += strlen(uuid);
1379                 pos += sprintf(buf + pos, "::%u", entry->mne_instance);
1380                 LASSERT(pos < bufsz);
1381
1382                 lustre_cfg_bufs_set_string(&bufs, 1, params);
1383
1384                 rc = -ENOMEM;
1385                 lcfg = lustre_cfg_new(LCFG_PARAM, &bufs);
1386                 if (lcfg == NULL) {
1387                         CERROR("mgc: cannot allocate memory\n");
1388                         break;
1389                 }
1390
1391                 CDEBUG(D_INFO, "ir apply logs "LPD64"/"LPD64" for %s -> %s\n",
1392                        prev_version, max_version, obdname, params);
1393
1394                 rc = class_process_config(lcfg);
1395                 lustre_cfg_free(lcfg);
1396                 if (rc)
1397                         CDEBUG(D_INFO, "process config for %s error %d\n",
1398                                obdname, rc);
1399
1400                 /* continue, even one with error */
1401         }
1402
1403         OBD_FREE(inst, CFS_PAGE_SIZE);
1404         RETURN(rc);
1405 }
1406
1407 /**
1408  * This function is called if this client was notified for target restarting
1409  * by the MGS. A CONFIG_READ RPC is going to send to fetch recovery logs.
1410  */
1411 static int mgc_process_recover_log(struct obd_device *obd,
1412                                    struct config_llog_data *cld)
1413 {
1414         struct ptlrpc_request *req = NULL;
1415         struct config_llog_instance *cfg = &cld->cld_cfg;
1416         struct mgs_config_body *body;
1417         struct mgs_config_res  *res;
1418         struct ptlrpc_bulk_desc *desc;
1419         cfs_page_t **pages;
1420         int nrpages;
1421         bool eof = true;
1422         int i;
1423         int ealen;
1424         int rc;
1425         ENTRY;
1426
1427         /* allocate buffer for bulk transfer.
1428          * if this is the first time for this mgs to read logs,
1429          * CONFIG_READ_NRPAGES_INIT will be used since it will read all logs
1430          * once; otherwise, it only reads increment of logs, this should be
1431          * small and CONFIG_READ_NRPAGES will be used.
1432          */
1433         nrpages = CONFIG_READ_NRPAGES;
1434         if (cfg->cfg_last_idx == 0) /* the first time */
1435                 nrpages = CONFIG_READ_NRPAGES_INIT;
1436
1437         OBD_ALLOC(pages, sizeof(*pages) * nrpages);
1438         if (pages == NULL)
1439                 GOTO(out, rc = -ENOMEM);
1440
1441         for (i = 0; i < nrpages; i++) {
1442                 pages[i] = cfs_alloc_page(CFS_ALLOC_STD);
1443                 if (pages[i] == NULL)
1444                         GOTO(out, rc = -ENOMEM);
1445         }
1446
1447 again:
1448         LASSERT(cld_is_recover(cld));
1449         LASSERT(cfs_mutex_is_locked(&cld->cld_lock));
1450         req = ptlrpc_request_alloc(class_exp2cliimp(cld->cld_mgcexp),
1451                                    &RQF_MGS_CONFIG_READ);
1452         if (req == NULL)
1453                 GOTO(out, rc = -ENOMEM);
1454
1455         rc = ptlrpc_request_pack(req, LUSTRE_MGS_VERSION, MGS_CONFIG_READ);
1456         if (rc)
1457                 GOTO(out, rc);
1458
1459         /* pack request */
1460         body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
1461         LASSERT(body != NULL);
1462         LASSERT(sizeof(body->mcb_name) > strlen(cld->cld_logname));
1463         strncpy(body->mcb_name, cld->cld_logname, sizeof(body->mcb_name));
1464         body->mcb_offset = cfg->cfg_last_idx + 1;
1465         body->mcb_type   = cld->cld_type;
1466         body->mcb_bits   = CFS_PAGE_SHIFT;
1467         body->mcb_units  = nrpages;
1468
1469         /* allocate bulk transfer descriptor */
1470         desc = ptlrpc_prep_bulk_imp(req, nrpages, BULK_PUT_SINK,
1471                                     MGS_BULK_PORTAL);
1472         if (desc == NULL)
1473                 GOTO(out, rc = -ENOMEM);
1474
1475         for (i = 0; i < nrpages; i++)
1476                 ptlrpc_prep_bulk_page(desc, pages[i], 0, CFS_PAGE_SIZE);
1477
1478         ptlrpc_request_set_replen(req);
1479         rc = ptlrpc_queue_wait(req);
1480         if (rc)
1481                 GOTO(out, rc);
1482
1483         res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
1484         if (res->mcr_size < res->mcr_offset)
1485                 GOTO(out, rc = -EINVAL);
1486
1487         /* always update the index even though it might have errors with
1488          * handling the recover logs */
1489         cfg->cfg_last_idx = res->mcr_offset;
1490         eof = res->mcr_offset == res->mcr_size;
1491
1492         CDEBUG(D_INFO, "Latest version "LPD64", more %d.\n",
1493                res->mcr_offset, eof == false);
1494
1495         ealen = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, 0);
1496         if (ealen < 0)
1497                 GOTO(out, rc = ealen);
1498
1499         if (ealen > nrpages << CFS_PAGE_SHIFT)
1500                 GOTO(out, rc = -EINVAL);
1501
1502         if (ealen == 0) { /* no logs transferred */
1503                 if (!eof)
1504                         rc = -EINVAL;
1505                 GOTO(out, rc);
1506         }
1507
1508         for (i = 0; i < nrpages && ealen > 0; i++) {
1509                 int rc2;
1510                 void *ptr;
1511
1512                 ptr = cfs_kmap(pages[i]);
1513                 rc2 = mgc_apply_recover_logs(obd, cld, res->mcr_offset, ptr,
1514                                              min_t(int, ealen, CFS_PAGE_SIZE));
1515                 cfs_kunmap(pages[i]);
1516                 if (rc2 < 0) {
1517                         CWARN("Process recover log %s error %d\n",
1518                               cld->cld_logname, rc2);
1519                         break;
1520                 }
1521
1522                 ealen -= CFS_PAGE_SIZE;
1523         }
1524
1525 out:
1526         if (req)
1527                 ptlrpc_req_finished(req);
1528
1529         if (rc == 0 && !eof)
1530                 goto again;
1531
1532         if (pages) {
1533                 for (i = 0; i < nrpages; i++) {
1534                         if (pages[i] == NULL)
1535                                 break;
1536                         cfs_free_page(pages[i]);
1537                 }
1538                 OBD_FREE(pages, sizeof(*pages) * nrpages);
1539         }
1540         return rc;
1541 }
1542
1543 /* identical to mgs_log_is_empty */
1544 static int mgc_llog_is_empty(struct obd_device *obd, struct llog_ctxt *ctxt,
1545                             char *name)
1546 {
1547         struct lvfs_run_ctxt saved;
1548         struct llog_handle *llh;
1549         int rc = 0;
1550
1551         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1552         rc = llog_create(ctxt, &llh, NULL, name);
1553         if (rc == 0) {
1554                 llog_init_handle(llh, LLOG_F_IS_PLAIN, NULL);
1555                 rc = llog_get_size(llh);
1556                 llog_close(llh);
1557         }
1558         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1559         /* header is record 1 */
1560         return(rc <= 1);
1561 }
1562
1563 static int mgc_copy_handler(struct llog_handle *llh, struct llog_rec_hdr *rec,
1564                             void *data)
1565 {
1566         struct llog_rec_hdr local_rec = *rec;
1567         struct llog_handle *local_llh = (struct llog_handle *)data;
1568         char *cfg_buf = (char*) (rec + 1);
1569         struct lustre_cfg *lcfg;
1570         int rc = 0;
1571         ENTRY;
1572
1573         /* Append all records */
1574         local_rec.lrh_len -= sizeof(*rec) + sizeof(struct llog_rec_tail);
1575         rc = llog_write_rec(local_llh, &local_rec, NULL, 0,
1576                             (void *)cfg_buf, -1);
1577
1578         lcfg = (struct lustre_cfg *)cfg_buf;
1579         CDEBUG(D_INFO, "idx=%d, rc=%d, len=%d, cmd %x %s %s\n",
1580                rec->lrh_index, rc, rec->lrh_len, lcfg->lcfg_command,
1581                lustre_cfg_string(lcfg, 0), lustre_cfg_string(lcfg, 1));
1582
1583         RETURN(rc);
1584 }
1585
1586 /* Copy a remote log locally */
1587 static int mgc_copy_llog(struct obd_device *obd, struct llog_ctxt *rctxt,
1588                          struct llog_ctxt *lctxt, char *logname)
1589 {
1590         struct llog_handle *local_llh, *remote_llh;
1591         struct obd_uuid *uuid;
1592         char *temp_log;
1593         int rc, rc2;
1594         ENTRY;
1595
1596         /* Write new log to a temp name, then vfs_rename over logname
1597            upon successful completion. */
1598
1599         OBD_ALLOC(temp_log, strlen(logname) + 1);
1600         if (!temp_log)
1601                 RETURN(-ENOMEM);
1602         sprintf(temp_log, "%sT", logname);
1603
1604         /* Make sure there's no old temp log */
1605         rc = llog_create(lctxt, &local_llh, NULL, temp_log);
1606         if (rc)
1607                 GOTO(out, rc);
1608         rc = llog_init_handle(local_llh, LLOG_F_IS_PLAIN, NULL);
1609         if (rc)
1610                 GOTO(out, rc);
1611         rc = llog_destroy(local_llh);
1612         llog_free_handle(local_llh);
1613         if (rc)
1614                 GOTO(out, rc);
1615
1616         /* open local log */
1617         rc = llog_create(lctxt, &local_llh, NULL, temp_log);
1618         if (rc)
1619                 GOTO(out, rc);
1620
1621         /* set the log header uuid for fun */
1622         OBD_ALLOC_PTR(uuid);
1623         obd_str2uuid(uuid, logname);
1624         rc = llog_init_handle(local_llh, LLOG_F_IS_PLAIN, uuid);
1625         OBD_FREE_PTR(uuid);
1626         if (rc)
1627                 GOTO(out_closel, rc);
1628
1629         /* open remote log */
1630         rc = llog_create(rctxt, &remote_llh, NULL, logname);
1631         if (rc)
1632                 GOTO(out_closel, rc);
1633         rc = llog_init_handle(remote_llh, LLOG_F_IS_PLAIN, NULL);
1634         if (rc)
1635                 GOTO(out_closer, rc);
1636
1637         /* Copy remote log */
1638         rc = llog_process(remote_llh, mgc_copy_handler,(void *)local_llh, NULL);
1639
1640 out_closer:
1641         rc2 = llog_close(remote_llh);
1642         if (!rc)
1643                 rc = rc2;
1644 out_closel:
1645         rc2 = llog_close(local_llh);
1646         if (!rc)
1647                 rc = rc2;
1648
1649         /* We've copied the remote log to the local temp log, now
1650            replace the old local log with the temp log. */
1651         if (!rc) {
1652                 struct client_obd *cli = &obd->u.cli;
1653                 LASSERT(cli);
1654                 LASSERT(cli->cl_mgc_configs_dir);
1655                 rc = lustre_rename(cli->cl_mgc_configs_dir, cli->cl_mgc_vfsmnt,
1656                                    temp_log, logname);
1657         }
1658         CDEBUG(D_MGC, "Copied remote log %s (%d)\n", logname, rc);
1659 out:
1660         if (rc)
1661                 CERROR("Failed to copy remote log %s (%d)\n", logname, rc);
1662         OBD_FREE(temp_log, strlen(logname) + 1);
1663         RETURN(rc);
1664 }
1665
1666 /* local_only means it cannot get remote llogs */
1667 static int mgc_process_cfg_log(struct obd_device *mgc,
1668                                struct config_llog_data *cld,
1669                                int local_only)
1670 {
1671         struct llog_ctxt *ctxt, *lctxt = NULL;
1672         struct client_obd *cli = &mgc->u.cli;
1673         struct lvfs_run_ctxt *saved_ctxt;
1674         struct lustre_sb_info *lsi = NULL;
1675         int rc = 0, must_pop = 0;
1676         bool sptlrpc_started = false;
1677
1678         ENTRY;
1679
1680         LASSERT(cld);
1681         LASSERT(cfs_mutex_is_locked(&cld->cld_lock));
1682
1683         /*
1684          * local copy of sptlrpc log is controlled elsewhere, don't try to
1685          * read it up here.
1686          */
1687         if (cld_is_sptlrpc(cld) && local_only)
1688                 RETURN(0);
1689
1690         if (cld->cld_cfg.cfg_sb)
1691                 lsi = s2lsi(cld->cld_cfg.cfg_sb);
1692
1693         ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1694         if (!ctxt) {
1695                 CERROR("missing llog context\n");
1696                 RETURN(-EINVAL);
1697         }
1698
1699         OBD_ALLOC_PTR(saved_ctxt);
1700         if (saved_ctxt == NULL)
1701                 RETURN(-ENOMEM);
1702
1703         lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT);
1704
1705         /* Copy the setup log locally if we can. Don't mess around if we're
1706            running an MGS though (logs are already local). */
1707         if (lctxt && lsi && (lsi->lsi_flags & LSI_SERVER) &&
1708             (lsi->lsi_srv_mnt == cli->cl_mgc_vfsmnt) &&
1709             !IS_MGS(lsi->lsi_ldd)) {
1710                 push_ctxt(saved_ctxt, &mgc->obd_lvfs_ctxt, NULL);
1711                 must_pop++;
1712                 if (!local_only)
1713                         /* Only try to copy log if we have the lock. */
1714                         rc = mgc_copy_llog(mgc, ctxt, lctxt, cld->cld_logname);
1715                 if (local_only || rc) {
1716                         if (mgc_llog_is_empty(mgc, lctxt, cld->cld_logname)) {
1717                                 LCONSOLE_ERROR_MSG(0x13a, "Failed to get MGS "
1718                                                    "log %s and no local copy."
1719                                                    "\n", cld->cld_logname);
1720                                 GOTO(out_pop, rc = -ENOTCONN);
1721                         }
1722                         CDEBUG(D_MGC, "Failed to get MGS log %s, using local "
1723                                "copy for now, will try to update later.\n",
1724                                cld->cld_logname);
1725                 }
1726                 /* Now, whether we copied or not, start using the local llog.
1727                    If we failed to copy, we'll start using whatever the old
1728                    log has. */
1729                 llog_ctxt_put(ctxt);
1730                 ctxt = lctxt;
1731                 lctxt = NULL;
1732         } else if (local_only) { /* no local log at client side */
1733                 GOTO(out_pop, rc = -EIO);
1734         }
1735
1736         if (cld_is_sptlrpc(cld)) {
1737                 sptlrpc_conf_log_update_begin(cld->cld_logname);
1738                 sptlrpc_started = true;
1739         }
1740
1741         /* logname and instance info should be the same, so use our
1742            copy of the instance for the update.  The cfg_last_idx will
1743            be updated here. */
1744         rc = class_config_parse_llog(ctxt, cld->cld_logname, &cld->cld_cfg);
1745         EXIT;
1746
1747 out_pop:
1748         llog_ctxt_put(ctxt);
1749         if (lctxt)
1750                 llog_ctxt_put(lctxt);
1751         if (must_pop)
1752                 pop_ctxt(saved_ctxt, &mgc->obd_lvfs_ctxt, NULL);
1753
1754         OBD_FREE_PTR(saved_ctxt);
1755         /*
1756          * update settings on existing OBDs. doing it inside
1757          * of llog_process_lock so no device is attaching/detaching
1758          * in parallel.
1759          * the logname must be <fsname>-sptlrpc
1760          */
1761         if (sptlrpc_started) {
1762                 LASSERT(cld_is_sptlrpc(cld));
1763                 sptlrpc_conf_log_update_end(cld->cld_logname);
1764                 class_notify_sptlrpc_conf(cld->cld_logname,
1765                                           strlen(cld->cld_logname) -
1766                                           strlen("-sptlrpc"));
1767         }
1768
1769         RETURN(rc);
1770 }
1771
1772 /** Get a config log from the MGS and process it.
1773  * This func is called for both clients and servers.
1774  * Copy the log locally before parsing it if appropriate (non-MGS server)
1775  */
1776 int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)
1777 {
1778         struct lustre_handle lockh = { 0 };
1779         int rc = 0, rcl, flags = LDLM_FL_NO_LRU;
1780         ENTRY;
1781
1782         LASSERT(cld);
1783
1784         /* I don't want multiple processes running process_log at once --
1785            sounds like badness.  It actually might be fine, as long as
1786            we're not trying to update from the same log
1787            simultaneously (in which case we should use a per-log sem.) */
1788         cfs_mutex_lock(&cld->cld_lock);
1789         if (cld->cld_stopping) {
1790                 cfs_mutex_unlock(&cld->cld_lock);
1791                 RETURN(0);
1792         }
1793
1794         OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PAUSE_PROCESS_LOG, 20);
1795
1796         CDEBUG(D_MGC, "Process log %s:%p from %d\n", cld->cld_logname,
1797                cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
1798
1799         /* Get the cfg lock on the llog */
1800         rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, NULL, LDLM_PLAIN, NULL,
1801                           LCK_CR, &flags, NULL, NULL, NULL,
1802                           cld, 0, NULL, &lockh);
1803         if (rcl == 0) {
1804                 /* Get the cld, it will be released in mgc_blocking_ast. */
1805                 config_log_get(cld);
1806                 rc = ldlm_lock_set_data(&lockh, (void *)cld);
1807                 LASSERT(rc == 0);
1808         } else {
1809                 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
1810
1811                 /* mark cld_lostlock so that it will requeue
1812                  * after MGC becomes available. */
1813                 cld->cld_lostlock = 1;
1814                 /* Get extra reference, it will be put in requeue thread */
1815                 config_log_get(cld);
1816         }
1817
1818
1819         if (cld_is_recover(cld)) {
1820                 rc = 0; /* this is not a fatal error for recover log */
1821                 if (rcl == 0)
1822                         rc = mgc_process_recover_log(mgc, cld);
1823         } else {
1824                 rc = mgc_process_cfg_log(mgc, cld, rcl != 0);
1825         }
1826
1827         CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
1828                mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
1829
1830         cfs_mutex_unlock(&cld->cld_lock);
1831
1832         /* Now drop the lock so MGS can revoke it */
1833         if (!rcl) {
1834                 rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, NULL,
1835                                  LCK_CR, &lockh);
1836                 if (rcl)
1837                         CERROR("Can't drop cfg lock: %d\n", rcl);
1838         }
1839
1840         RETURN(rc);
1841 }
1842
1843
1844 /** Called from lustre_process_log.
1845  * LCFG_LOG_START gets the config log from the MGS, processes it to start
1846  * any services, and adds it to the list logs to watch (follow).
1847  */
1848 static int mgc_process_config(struct obd_device *obd, obd_count len, void *buf)
1849 {
1850         struct lustre_cfg *lcfg = buf;
1851         struct config_llog_instance *cfg = NULL;
1852         char *logname;
1853         int rc = 0;
1854         ENTRY;
1855
1856         switch(lcfg->lcfg_command) {
1857         case LCFG_LOV_ADD_OBD: {
1858                 /* Overloading this cfg command: register a new target */
1859                 struct mgs_target_info *mti;
1860
1861                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
1862                     sizeof(struct mgs_target_info))
1863                         GOTO(out, rc = -EINVAL);
1864
1865                 mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1);
1866                 CDEBUG(D_MGC, "add_target %s %#x\n",
1867                        mti->mti_svname, mti->mti_flags);
1868                 rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti);
1869                 break;
1870         }
1871         case LCFG_LOV_DEL_OBD:
1872                 /* Unregister has no meaning at the moment. */
1873                 CERROR("lov_del_obd unimplemented\n");
1874                 rc = -ENOSYS;
1875                 break;
1876         case LCFG_SPTLRPC_CONF: {
1877                 rc = sptlrpc_process_config(lcfg);
1878                 break;
1879         }
1880         case LCFG_LOG_START: {
1881                 struct config_llog_data *cld;
1882                 struct super_block *sb;
1883
1884                 logname = lustre_cfg_string(lcfg, 1);
1885                 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
1886                 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
1887
1888                 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
1889                        cfg->cfg_last_idx);
1890
1891                 /* We're only called through here on the initial mount */
1892                 rc = config_log_add(obd, logname, cfg, sb);
1893                 if (rc)
1894                         break;
1895                 cld = config_log_find(logname, cfg);
1896                 if (cld == NULL) {
1897                         rc = -ENOENT;
1898                         break;
1899                 }
1900
1901                 /* COMPAT_146 */
1902                 /* FIXME only set this for old logs!  Right now this forces
1903                    us to always skip the "inside markers" check */
1904                 cld->cld_cfg.cfg_flags |= CFG_F_COMPAT146;
1905
1906                 rc = mgc_process_log(obd, cld);
1907                 if (rc == 0 && cld->cld_recover != NULL) {
1908                         if (OCD_HAS_FLAG(&obd->u.cli.cl_import->
1909                                          imp_connect_data, IMP_RECOV)) {
1910                                 rc = mgc_process_log(obd, cld->cld_recover);
1911                         } else {
1912                                 struct config_llog_data *cir = cld->cld_recover;
1913                                 cld->cld_recover = NULL;
1914                                 config_log_put(cir);
1915                         }
1916                         if (rc)
1917                                 CERROR("Cannot process recover llog %d\n", rc);
1918                 }
1919                 config_log_put(cld);
1920
1921                 break;
1922         }
1923         case LCFG_LOG_END: {
1924                 logname = lustre_cfg_string(lcfg, 1);
1925
1926                 if (lcfg->lcfg_bufcount >= 2)
1927                         cfg = (struct config_llog_instance *)lustre_cfg_buf(
1928                                 lcfg, 2);
1929                 rc = config_log_end(logname, cfg);
1930                 break;
1931         }
1932         default: {
1933                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1934                 GOTO(out, rc = -EINVAL);
1935
1936         }
1937         }
1938 out:
1939         RETURN(rc);
1940 }
1941
1942 struct obd_ops mgc_obd_ops = {
1943         .o_owner        = THIS_MODULE,
1944         .o_setup        = mgc_setup,
1945         .o_precleanup   = mgc_precleanup,
1946         .o_cleanup      = mgc_cleanup,
1947         .o_add_conn     = client_import_add_conn,
1948         .o_del_conn     = client_import_del_conn,
1949         .o_connect      = client_connect_import,
1950         .o_disconnect   = client_disconnect_export,
1951         //.o_enqueue      = mgc_enqueue,
1952         .o_cancel       = mgc_cancel,
1953         //.o_iocontrol    = mgc_iocontrol,
1954         .o_set_info_async = mgc_set_info_async,
1955         .o_get_info       = mgc_get_info,
1956         .o_import_event = mgc_import_event,
1957         .o_llog_init    = mgc_llog_init,
1958         .o_llog_finish  = mgc_llog_finish,
1959         .o_process_config = mgc_process_config,
1960 };
1961
1962 int __init mgc_init(void)
1963 {
1964         return class_register_type(&mgc_obd_ops, NULL, NULL,
1965                                    LUSTRE_MGC_NAME, NULL);
1966 }
1967
1968 #ifdef __KERNEL__
1969 static void /*__exit*/ mgc_exit(void)
1970 {
1971         class_unregister_type(LUSTRE_MGC_NAME);
1972 }
1973
1974 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1975 MODULE_DESCRIPTION("Lustre Management Client");
1976 MODULE_LICENSE("GPL");
1977
1978 module_init(mgc_init);
1979 module_exit(mgc_exit);
1980 #endif