lustre/obdclass/obd_config.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  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/obdclass/obd_config.c
  37  *
  38  * Config API
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_CLASS
  42 #ifdef __KERNEL__
  43 #include <obd_class.h>
  44 #include <linux/string.h>
  45 #else
  46 #include <liblustre.h>
  47 #include <obd_class.h>
  48 #include <obd.h>
  49 #endif
  50 #include <lustre_log.h>
  51 #include <lprocfs_status.h>
  52 #include <libcfs/list.h>
  53 #include <lustre_param.h>
  54 #include <class_hash.h>
  55
  56 static lustre_hash_ops_t uuid_hash_ops;
  57 static lustre_hash_ops_t nid_hash_ops;
  58 static lustre_hash_ops_t nid_stat_hash_ops;
  59
  60 /*********** string parsing utils *********/
  61
  62 /* returns 0 if we find this key in the buffer, else 1 */
  63 int class_find_param(char *buf, char *key, char **valp)
  64 {
  65         char *ptr;
  66
  67         if (!buf)
  68                 return 1;
  69
  70         if ((ptr = strstr(buf, key)) == NULL)
  71                 return 1;
  72
  73         if (valp)
  74                 *valp = ptr + strlen(key);
  75
  76         return 0;
  77 }
  78
  79 /**
  80  * Finds a parameter in \a params and copies it to \a copy.
  81  *
  82  * Leading spaces are skipped. Next space or end of string is the
  83  * parameter terminator with the exception that spaces inside single or double
  84  * quotes get included into a parameter. The parameter is copied into \a copy
  85  * which has to be allocated big enough by a caller, quotes are stripped in
  86  * the copy and the copy is terminated by 0.
  87  *
  88  * On return \a params is set to next parameter or to NULL if last
  89  * parameter is returned.
  90  *
  91  * \retval 0 if parameter is returned in \a copy
  92  * \retval 1 otherwise
  93  * \retval -EINVAL if unbalanced quota is found
  94  */
  95 int class_get_next_param(char **params, char *copy)
  96 {
  97         char *q1, *q2, *str;
  98         int len;
  99
 100         str = *params;
 101         while (*str == ' ')
 102                 str++;
 103
 104         if (*str == '\0') {
 105                 *params = NULL;
 106                 return 1;
 107         }
 108
 109         while (1) {
 110                 q1 = strpbrk(str, " '\"");
 111                 if (q1 == NULL) {
 112                         len = strlen(str);
 113                         memcpy(copy, str, len);
 114                         copy[len] = '\0';
 115                         *params = NULL;
 116                         return 0;
 117                 }
 118                 len = q1 - str;
 119                 if (*q1 == ' ') {
 120                         memcpy(copy, str, len);
 121                         copy[len] = '\0';
 122                         *params = str + len;
 123                         return 0;
 124                 }
 125
 126                 memcpy(copy, str, len);
 127                 copy += len;
 128
 129                 /* search for the matching closing quote */
 130                 str = q1 + 1;
 131                 q2 = strchr(str, *q1);
 132                 if (q2 == NULL) {
 133                         CERROR("Unbalanced quota in parameters: \"%s\"\n",
 134                                *params);
 135                         return -EINVAL;
 136                 }
 137                 len = q2 - str;
 138                 memcpy(copy, str, len);
 139                 copy += len;
 140                 str = q2 + 1;
 141         }
 142         return 1;
 143 }
 144
 145 /* returns 0 if this is the first key in the buffer, else 1.
 146    valp points to first char after key. */
 147 int class_match_param(char *buf, char *key, char **valp)
 148 {
 149         if (!buf)
 150                 return 1;
 151
 152         if (memcmp(buf, key, strlen(key)) != 0)
 153                 return 1;
 154
 155         if (valp)
 156                 *valp = buf + strlen(key);
 157
 158         return 0;
 159 }
 160
 161 /* 0 is good nid,
 162    1 not found
 163    < 0 error
 164    endh is set to next separator */
 165 int class_parse_nid(char *buf, lnet_nid_t *nid, char **endh)
 166 {
 167         char tmp, *endp;
 168
 169         if (!buf)
 170                 return 1;
 171         while (*buf == ',' || *buf == ':')
 172                 buf++;
 173         if (*buf == ' ' || *buf == '/' || *buf == '\0')
 174                 return 1;
 175
 176         /* nid separators or end of nids */
 177         endp = strpbrk(buf, ",: /");
 178         if (endp == NULL)
 179                 endp = buf + strlen(buf);
 180
 181         tmp = *endp;
 182         *endp = '\0';
 183         *nid = libcfs_str2nid(buf);
 184         if (*nid == LNET_NID_ANY) {
 185                 LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
 186                 *endp = tmp;
 187                 return -EINVAL;
 188         }
 189         *endp = tmp;
 190
 191         if (endh)
 192                 *endh = endp;
 193         CDEBUG(D_INFO, "Nid %s\n", libcfs_nid2str(*nid));
 194         return 0;
 195 }
 196
 197 EXPORT_SYMBOL(class_find_param);
 198 EXPORT_SYMBOL(class_get_next_param);
 199 EXPORT_SYMBOL(class_match_param);
 200 EXPORT_SYMBOL(class_parse_nid);
 201
 202 /********************** class fns **********************/
 203
 204 /**
 205  * Create a new device and set the type, name and uuid.  If successful, the new
 206  * device can be accessed by either name or uuid.
 207  */
 208 int class_attach(struct lustre_cfg *lcfg)
 209 {
 210         struct obd_device *obd = NULL;
 211         char *typename, *name, *uuid;
 212         int rc, len;
 213         ENTRY;
 214
 215         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 216                 CERROR("No type passed!\n");
 217                 RETURN(-EINVAL);
 218         }
 219         typename = lustre_cfg_string(lcfg, 1);
 220
 221         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 222                 CERROR("No name passed!\n");
 223                 RETURN(-EINVAL);
 224         }
 225         name = lustre_cfg_string(lcfg, 0);
 226
 227         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 228                 CERROR("No UUID passed!\n");
 229                 RETURN(-EINVAL);
 230         }
 231         uuid = lustre_cfg_string(lcfg, 2);
 232
 233         CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 234                MKSTR(typename), MKSTR(name), MKSTR(uuid));
 235
 236         obd = class_newdev(typename, name);
 237         if (IS_ERR(obd)) {
 238                 /* Already exists or out of obds */
 239                 rc = PTR_ERR(obd);
 240                 obd = NULL;
 241                 CERROR("Cannot create device %s of type %s : %d\n",
 242                        name, typename, rc);
 243                 GOTO(out, rc);
 244         }
 245         LASSERTF(obd != NULL, "Cannot get obd device %s of type %s\n",
 246                  name, typename);
 247         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 248                  "obd %p obd_magic %08X != %08X\n",
 249                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 250         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 251                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 252
 253         rwlock_init(&obd->obd_pool_lock);
 254         obd->obd_pool_limit = 0;
 255         obd->obd_pool_slv = 0;
 256
 257         CFS_INIT_LIST_HEAD(&obd->obd_exports);
 258         CFS_INIT_LIST_HEAD(&obd->obd_delayed_exports);
 259         CFS_INIT_LIST_HEAD(&obd->obd_exports_timed);
 260         CFS_INIT_LIST_HEAD(&obd->obd_nid_stats);
 261         spin_lock_init(&obd->obd_nid_lock);
 262         spin_lock_init(&obd->obd_dev_lock);
 263         sema_init(&obd->obd_dev_sem, 1);
 264         spin_lock_init(&obd->obd_osfs_lock);
 265         /* obd->obd_osfs_age must be set to a value in the distant
 266          * past to guarantee a fresh statfs is fetched on mount. */
 267         obd->obd_osfs_age = cfs_time_shift_64(-1000);
 268
 269         /* XXX belongs in setup not attach  */
 270         /* recovery data */
 271         cfs_init_timer(&obd->obd_recovery_timer);
 272         spin_lock_init(&obd->obd_processing_task_lock);
 273         cfs_waitq_init(&obd->obd_next_transno_waitq);
 274         cfs_waitq_init(&obd->obd_evict_inprogress_waitq);
 275         CFS_INIT_LIST_HEAD(&obd->obd_req_replay_queue);
 276         CFS_INIT_LIST_HEAD(&obd->obd_lock_replay_queue);
 277         CFS_INIT_LIST_HEAD(&obd->obd_final_req_queue);
 278
 279         llog_group_init(&obd->obd_olg, FILTER_GROUP_LLOG);
 280
 281         len = strlen(uuid);
 282         if (len >= sizeof(obd->obd_uuid)) {
 283                 CERROR("uuid must be < %d bytes long\n",
 284                        (int)sizeof(obd->obd_uuid));
 285                 GOTO(out, rc = -EINVAL);
 286         }
 287         memcpy(obd->obd_uuid.uuid, uuid, len);
 288
 289         /* do the attach */
 290         if (OBP(obd, attach)) {
 291                 rc = OBP(obd,attach)(obd, sizeof *lcfg, lcfg);
 292                 if (rc)
 293                         GOTO(out, rc = -EINVAL);
 294         }
 295
 296         /* Detach drops this */
 297         spin_lock(&obd->obd_dev_lock);
 298         atomic_set(&obd->obd_refcount, 1);
 299         spin_unlock(&obd->obd_dev_lock);
 300         lu_ref_init(&obd->obd_reference);
 301         lu_ref_add(&obd->obd_reference, "attach", obd);
 302
 303         obd->obd_attached = 1;
 304         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 305                obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
 306         RETURN(0);
 307  out:
 308         if (obd != NULL) {
 309                 class_release_dev(obd);
 310         }
 311         return rc;
 312 }
 313
 314 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 315 {
 316         int err = 0;
 317         struct obd_export *exp;
 318         ENTRY;
 319
 320         LASSERT(obd != NULL);
 321         LASSERTF(obd == class_num2obd(obd->obd_minor),
 322                  "obd %p != obd_devs[%d] %p\n",
 323                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 324         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 325                  "obd %p obd_magic %08x != %08x\n",
 326                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 327
 328         /* have we attached a type to this device? */
 329         if (!obd->obd_attached) {
 330                 CERROR("Device %d not attached\n", obd->obd_minor);
 331                 RETURN(-ENODEV);
 332         }
 333
 334         if (obd->obd_set_up) {
 335                 CERROR("Device %d already setup (type %s)\n",
 336                        obd->obd_minor, obd->obd_type->typ_name);
 337                 RETURN(-EEXIST);
 338         }
 339
 340         /* is someone else setting us up right now? (attach inits spinlock) */
 341         spin_lock(&obd->obd_dev_lock);
 342         if (obd->obd_starting) {
 343                 spin_unlock(&obd->obd_dev_lock);
 344                 CERROR("Device %d setup in progress (type %s)\n",
 345                        obd->obd_minor, obd->obd_type->typ_name);
 346                 RETURN(-EEXIST);
 347         }
 348         /* just leave this on forever.  I can't use obd_set_up here because
 349            other fns check that status, and we're not actually set up yet. */
 350         obd->obd_starting = 1;
 351         obd->obd_uuid_hash = NULL;
 352         obd->obd_nid_hash = NULL;
 353         obd->obd_nid_stats_hash = NULL;
 354         spin_unlock(&obd->obd_dev_lock);
 355
 356         /* create an uuid-export lustre hash */
 357         obd->obd_uuid_hash = lustre_hash_init("UUID_HASH",
 358                                               HASH_UUID_CUR_BITS,
 359                                               HASH_UUID_MAX_BITS,
 360                                               &uuid_hash_ops, 0);
 361         if (!obd->obd_uuid_hash)
 362                 GOTO(err_hash, err = -ENOMEM);
 363
 364         /* create a nid-export lustre hash */
 365         obd->obd_nid_hash = lustre_hash_init("NID_HASH",
 366                                              HASH_NID_CUR_BITS,
 367                                              HASH_NID_MAX_BITS,
 368                                              &nid_hash_ops, 0);
 369         if (!obd->obd_nid_hash)
 370                 GOTO(err_hash, err = -ENOMEM);
 371
 372         /* create a nid-stats lustre hash */
 373         obd->obd_nid_stats_hash = lustre_hash_init("NID_STATS",
 374                                                    HASH_NID_STATS_CUR_BITS,
 375                                                    HASH_NID_STATS_MAX_BITS,
 376                                                    &nid_stat_hash_ops, 0);
 377         if (!obd->obd_nid_stats_hash)
 378                 GOTO(err_hash, err = -ENOMEM);
 379
 380         exp = class_new_export(obd, &obd->obd_uuid);
 381         if (IS_ERR(exp))
 382                 GOTO(err_hash, err = PTR_ERR(exp));
 383
 384         obd->obd_self_export = exp;
 385         list_del_init(&exp->exp_obd_chain_timed);
 386         class_export_put(exp);
 387
 388         err = obd_setup(obd, lcfg);
 389         if (err)
 390                 GOTO(err_exp, err);
 391
 392         obd->obd_set_up = 1;
 393
 394         spin_lock(&obd->obd_dev_lock);
 395         /* cleanup drops this */
 396         class_incref(obd, "setup", obd);
 397         spin_unlock(&obd->obd_dev_lock);
 398
 399         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 400                obd->obd_name, obd->obd_uuid.uuid);
 401
 402         RETURN(0);
 403 err_exp:
 404         if (obd->obd_self_export) {
 405                 class_unlink_export(obd->obd_self_export);
 406                 obd->obd_self_export = NULL;
 407         }
 408 err_hash:
 409         if (obd->obd_uuid_hash) {
 410                 lustre_hash_exit(obd->obd_uuid_hash);
 411                 obd->obd_uuid_hash = NULL;
 412         }
 413         if (obd->obd_nid_hash) {
 414                 lustre_hash_exit(obd->obd_nid_hash);
 415                 obd->obd_nid_hash = NULL;
 416         }
 417         if (obd->obd_nid_stats_hash) {
 418                 lustre_hash_exit(obd->obd_nid_stats_hash);
 419                 obd->obd_nid_stats_hash = NULL;
 420         }
 421         obd->obd_starting = 0;
 422         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 423         return err;
 424 }
 425
 426 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 427 {
 428         ENTRY;
 429
 430         if (obd->obd_set_up) {
 431                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 432                 RETURN(-EBUSY);
 433         }
 434
 435         spin_lock(&obd->obd_dev_lock);
 436         if (!obd->obd_attached) {
 437                 spin_unlock(&obd->obd_dev_lock);
 438                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 439                 RETURN(-ENODEV);
 440         }
 441         obd->obd_attached = 0;
 442         spin_unlock(&obd->obd_dev_lock);
 443
 444         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 445                obd->obd_name, obd->obd_uuid.uuid);
 446
 447         class_decref(obd, "attach", obd);
 448
 449         /* not strictly necessary, but cleans up eagerly */
 450         obd_zombie_impexp_cull();
 451
 452         RETURN(0);
 453 }
 454
 455 static void dump_exports(struct obd_device *obd)
 456 {
 457         struct obd_export *exp;
 458
 459         spin_lock(&obd->obd_dev_lock);
 460         list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) {
 461                 struct ptlrpc_reply_state *rs;
 462                 struct ptlrpc_reply_state *first_reply = NULL;
 463                 int                        nreplies = 0;
 464
 465                 spin_lock(&exp->exp_lock);
 466                 list_for_each_entry (rs, &exp->exp_outstanding_replies,
 467                                      rs_exp_list) {
 468                         if (nreplies == 0)
 469                                 first_reply = rs;
 470                         nreplies++;
 471                 }
 472                 spin_unlock(&exp->exp_lock);
 473
 474                 CDEBUG(D_IOCTL, "%s: %p %s %s %d %d %d: %p %s\n",
 475                        obd->obd_name, exp, exp->exp_client_uuid.uuid,
 476                        obd_export_nid2str(exp),
 477                        atomic_read(&exp->exp_refcount),
 478                        exp->exp_failed, nreplies, first_reply,
 479                        nreplies > 3 ? "..." : "");
 480         }
 481         spin_unlock(&obd->obd_dev_lock);
 482 }
 483
 484 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 485 {
 486         int err = 0;
 487         char *flag;
 488         ENTRY;
 489
 490         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 491
 492         if (!obd->obd_set_up) {
 493                 CERROR("Device %d not setup\n", obd->obd_minor);
 494                 RETURN(-ENODEV);
 495         }
 496
 497         spin_lock(&obd->obd_dev_lock);
 498         if (obd->obd_stopping) {
 499                 spin_unlock(&obd->obd_dev_lock);
 500                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 501                 RETURN(-ENODEV);
 502         }
 503         /* Leave this on forever */
 504         obd->obd_stopping = 1;
 505         spin_unlock(&obd->obd_dev_lock);
 506
 507         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 508                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 509                         switch (*flag) {
 510                         case 'F':
 511                                 obd->obd_force = 1;
 512                                 break;
 513                         case 'A':
 514                                 LCONSOLE_WARN("Failing over %s\n",
 515                                               obd->obd_name);
 516                                 obd->obd_fail = 1;
 517                                 obd->obd_no_transno = 1;
 518                                 obd->obd_no_recov = 1;
 519                                 if (OBP(obd, iocontrol)) {
 520                                         obd_iocontrol(OBD_IOC_SYNC,
 521                                                       obd->obd_self_export,
 522                                                       0, NULL, NULL);
 523                                         /* Set the obd readonly if we can */
 524                                         obd_iocontrol(OBD_IOC_SET_READONLY,
 525                                                       obd->obd_self_export,
 526                                                       0, NULL, NULL);
 527                                 }
 528                                 break;
 529                         default:
 530                                 CERROR("Unrecognised flag '%c'\n", *flag);
 531                         }
 532         }
 533
 534         LASSERT(obd->obd_self_export);
 535
 536         /* The three references that should be remaining are the
 537          * obd_self_export and the attach and setup references. */
 538         if (atomic_read(&obd->obd_refcount) > 3) {
 539                 /* refcounf - 3 might be the number of real exports
 540                    (excluding self export). But class_incref is called
 541                    by other things as well, so don't count on it. */
 542                 CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d\n",
 543                        obd->obd_name, atomic_read(&obd->obd_refcount) - 3);
 544                 dump_exports(obd);
 545                 class_disconnect_exports(obd);
 546         }
 547
 548         /* destroy an uuid-export hash body */
 549         if (obd->obd_uuid_hash) {
 550                 lustre_hash_exit(obd->obd_uuid_hash);
 551                 obd->obd_uuid_hash = NULL;
 552         }
 553
 554         /* destroy a nid-export hash body */
 555         if (obd->obd_nid_hash) {
 556                 lustre_hash_exit(obd->obd_nid_hash);
 557                 obd->obd_nid_hash = NULL;
 558         }
 559
 560         /* destroy a nid-stats hash body */
 561         if (obd->obd_nid_stats_hash) {
 562                 lustre_hash_exit(obd->obd_nid_stats_hash);
 563                 obd->obd_nid_stats_hash = NULL;
 564         }
 565
 566         /* Precleanup, we must make sure all exports get destroyed. */
 567         err = obd_precleanup(obd, OBD_CLEANUP_EXPORTS);
 568         if (err)
 569                 CERROR("Precleanup %s returned %d\n",
 570                        obd->obd_name, err);
 571         class_decref(obd, "setup", obd);
 572         obd->obd_set_up = 0;
 573         RETURN(0);
 574 }
 575
 576 struct obd_device *class_incref(struct obd_device *obd,
 577                                 const char *scope, const void *source)
 578 {
 579         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 580         atomic_inc(&obd->obd_refcount);
 581         CDEBUG(D_INFO, "incref %s (%p) now %d\n", obd->obd_name, obd,
 582                atomic_read(&obd->obd_refcount));
 583
 584         return obd;
 585 }
 586
 587 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 588 {
 589         int err;
 590         int refs;
 591
 592         spin_lock(&obd->obd_dev_lock);
 593         atomic_dec(&obd->obd_refcount);
 594         refs = atomic_read(&obd->obd_refcount);
 595         spin_unlock(&obd->obd_dev_lock);
 596         lu_ref_del(&obd->obd_reference, scope, source);
 597
 598         CDEBUG(D_INFO, "Decref %s (%p) now %d\n", obd->obd_name, obd, refs);
 599
 600         if ((refs == 1) && obd->obd_stopping) {
 601                 /* All exports have been destroyed; there should
 602                    be no more in-progress ops by this point.*/
 603
 604                 spin_lock(&obd->obd_self_export->exp_lock);
 605                 obd->obd_self_export->exp_flags |= exp_flags_from_obd(obd);
 606                 spin_unlock(&obd->obd_self_export->exp_lock);
 607
 608                 /* note that we'll recurse into class_decref again */
 609                 class_unlink_export(obd->obd_self_export);
 610                 return;
 611         }
 612
 613         if (refs == 0) {
 614                 CDEBUG(D_CONFIG, "finishing cleanup of obd %s (%s)\n",
 615                        obd->obd_name, obd->obd_uuid.uuid);
 616                 LASSERT(!obd->obd_attached);
 617                 if (obd->obd_stopping) {
 618                         /* If we're not stopping, we were never set up */
 619                         err = obd_cleanup(obd);
 620                         if (err)
 621                                 CERROR("Cleanup %s returned %d\n",
 622                                        obd->obd_name, err);
 623                 }
 624                 if (OBP(obd, detach)) {
 625                         err = OBP(obd, detach)(obd);
 626                         if (err)
 627                                 CERROR("Detach returned %d\n", err);
 628                 }
 629                 class_release_dev(obd);
 630         }
 631 }
 632
 633 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 634 {
 635         struct obd_import *imp;
 636         struct obd_uuid uuid;
 637         int rc;
 638         ENTRY;
 639
 640         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 641             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 642                 CERROR("invalid conn_uuid\n");
 643                 RETURN(-EINVAL);
 644         }
 645         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 646             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
 647             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
 648                 CERROR("can't add connection on non-client dev\n");
 649                 RETURN(-EINVAL);
 650         }
 651
 652         imp = obd->u.cli.cl_import;
 653         if (!imp) {
 654                 CERROR("try to add conn on immature client dev\n");
 655                 RETURN(-EINVAL);
 656         }
 657
 658         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 659         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
 660
 661         RETURN(rc);
 662 }
 663
 664 int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 665 {
 666         struct obd_import *imp;
 667         struct obd_uuid uuid;
 668         int rc;
 669         ENTRY;
 670
 671         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 672             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 673                 CERROR("invalid conn_uuid\n");
 674                 RETURN(-EINVAL);
 675         }
 676         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 677             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 678                 CERROR("can't del connection on non-client dev\n");
 679                 RETURN(-EINVAL);
 680         }
 681
 682         imp = obd->u.cli.cl_import;
 683         if (!imp) {
 684                 CERROR("try to del conn on immature client dev\n");
 685                 RETURN(-EINVAL);
 686         }
 687
 688         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 689         rc = obd_del_conn(imp, &uuid);
 690
 691         RETURN(rc);
 692 }
 693
 694 CFS_LIST_HEAD(lustre_profile_list);
 695
 696 struct lustre_profile *class_get_profile(const char * prof)
 697 {
 698         struct lustre_profile *lprof;
 699
 700         ENTRY;
 701         list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
 702                 if (!strcmp(lprof->lp_profile, prof)) {
 703                         RETURN(lprof);
 704                 }
 705         }
 706         RETURN(NULL);
 707 }
 708
 709 int class_add_profile(int proflen, char *prof, int osclen, char *osc,
 710                       int mdclen, char *mdc)
 711 {
 712         struct lustre_profile *lprof;
 713         int err = 0;
 714         ENTRY;
 715
 716         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
 717
 718         OBD_ALLOC(lprof, sizeof(*lprof));
 719         if (lprof == NULL)
 720                 RETURN(-ENOMEM);
 721         CFS_INIT_LIST_HEAD(&lprof->lp_list);
 722
 723         LASSERT(proflen == (strlen(prof) + 1));
 724         OBD_ALLOC(lprof->lp_profile, proflen);
 725         if (lprof->lp_profile == NULL)
 726                 GOTO(out, err = -ENOMEM);
 727         memcpy(lprof->lp_profile, prof, proflen);
 728
 729         LASSERT(osclen == (strlen(osc) + 1));
 730         OBD_ALLOC(lprof->lp_dt, osclen);
 731         if (lprof->lp_dt == NULL)
 732                 GOTO(out, err = -ENOMEM);
 733         memcpy(lprof->lp_dt, osc, osclen);
 734
 735         if (mdclen > 0) {
 736                 LASSERT(mdclen == (strlen(mdc) + 1));
 737                 OBD_ALLOC(lprof->lp_md, mdclen);
 738                 if (lprof->lp_md == NULL)
 739                         GOTO(out, err = -ENOMEM);
 740                 memcpy(lprof->lp_md, mdc, mdclen);
 741         }
 742
 743         list_add(&lprof->lp_list, &lustre_profile_list);
 744         RETURN(err);
 745
 746 out:
 747         if (lprof->lp_md)
 748                 OBD_FREE(lprof->lp_md, mdclen);
 749         if (lprof->lp_dt)
 750                 OBD_FREE(lprof->lp_dt, osclen);
 751         if (lprof->lp_profile)
 752                 OBD_FREE(lprof->lp_profile, proflen);
 753         OBD_FREE(lprof, sizeof(*lprof));
 754         RETURN(err);
 755 }
 756
 757 void class_del_profile(const char *prof)
 758 {
 759         struct lustre_profile *lprof;
 760         ENTRY;
 761
 762         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
 763
 764         lprof = class_get_profile(prof);
 765         if (lprof) {
 766                 list_del(&lprof->lp_list);
 767                 OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
 768                 OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
 769                 if (lprof->lp_md)
 770                         OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
 771                 OBD_FREE(lprof, sizeof *lprof);
 772         }
 773         EXIT;
 774 }
 775
 776 /* COMPAT_146 */
 777 void class_del_profiles(void)
 778 {
 779         struct lustre_profile *lprof, *n;
 780         ENTRY;
 781
 782         list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
 783                 list_del(&lprof->lp_list);
 784                 OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
 785                 OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
 786                 if (lprof->lp_md)
 787                         OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
 788                 OBD_FREE(lprof, sizeof *lprof);
 789         }
 790         EXIT;
 791 }
 792
 793 /* We can't call ll_process_config directly because it lives in a module that
 794    must be loaded after this one. */
 795 static int (*client_process_config)(struct lustre_cfg *lcfg) = NULL;
 796
 797 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg))
 798 {
 799         client_process_config = cpc;
 800 }
 801 EXPORT_SYMBOL(lustre_register_client_process_config);
 802
 803 int class_process_config(struct lustre_cfg *lcfg)
 804 {
 805         struct obd_device *obd;
 806         int err;
 807
 808         LASSERT(lcfg && !IS_ERR(lcfg));
 809         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
 810
 811         /* Commands that don't need a device */
 812         switch(lcfg->lcfg_command) {
 813         case LCFG_ATTACH: {
 814                 err = class_attach(lcfg);
 815                 GOTO(out, err);
 816         }
 817         case LCFG_ADD_UUID: {
 818                 CDEBUG(D_IOCTL, "adding mapping from uuid %s to nid "LPX64
 819                        " (%s)\n", lustre_cfg_string(lcfg, 1),
 820                        lcfg->lcfg_nid, libcfs_nid2str(lcfg->lcfg_nid));
 821
 822                 err = class_add_uuid(lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid);
 823                 GOTO(out, err);
 824         }
 825         case LCFG_DEL_UUID: {
 826                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
 827                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) == 0)
 828                        ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
 829
 830                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
 831                 GOTO(out, err);
 832         }
 833         case LCFG_MOUNTOPT: {
 834                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
 835                        lustre_cfg_string(lcfg, 1),
 836                        lustre_cfg_string(lcfg, 2),
 837                        lustre_cfg_string(lcfg, 3));
 838                 /* set these mount options somewhere, so ll_fill_super
 839                  * can find them. */
 840                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
 841                                         lustre_cfg_string(lcfg, 1),
 842                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
 843                                         lustre_cfg_string(lcfg, 2),
 844                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
 845                                         lustre_cfg_string(lcfg, 3));
 846                 GOTO(out, err);
 847         }
 848         case LCFG_DEL_MOUNTOPT: {
 849                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
 850                        lustre_cfg_string(lcfg, 1));
 851                 class_del_profile(lustre_cfg_string(lcfg, 1));
 852                 GOTO(out, err = 0);
 853         }
 854         case LCFG_SET_TIMEOUT: {
 855                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
 856                        obd_timeout, lcfg->lcfg_num);
 857                 obd_timeout = max(lcfg->lcfg_num, 1U);
 858                 GOTO(out, err = 0);
 859         }
 860         case LCFG_SET_LDLM_TIMEOUT: {
 861                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
 862                        ldlm_timeout, lcfg->lcfg_num);
 863                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
 864                 if (ldlm_timeout >= obd_timeout)
 865                         ldlm_timeout = max(obd_timeout / 3, 1U);
 866
 867                 GOTO(out, err = 0);
 868         }
 869         case LCFG_SET_UPCALL: {
 870                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
 871                 /* COMPAT_146 Don't fail on old configs */
 872                 GOTO(out, err = 0);
 873         }
 874         case LCFG_MARKER: {
 875                 struct cfg_marker *marker;
 876                 marker = lustre_cfg_buf(lcfg, 1);
 877                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
 878                        marker->cm_flags, marker->cm_tgtname, marker->cm_comment);
 879                 GOTO(out, err = 0);
 880         }
 881         case LCFG_PARAM: {
 882                 /* llite has no obd */
 883                 if ((class_match_param(lustre_cfg_string(lcfg, 1),
 884                                        PARAM_LLITE, 0) == 0) &&
 885                     client_process_config) {
 886                         err = (*client_process_config)(lcfg);
 887                         GOTO(out, err);
 888                 }
 889                 /* Fall through */
 890                 break;
 891         }
 892         }
 893
 894         /* Commands that require a device */
 895         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
 896         if (obd == NULL) {
 897                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
 898                         CERROR("this lcfg command requires a device name\n");
 899                 else
 900                         CERROR("no device for: %s\n",
 901                                lustre_cfg_string(lcfg, 0));
 902
 903                 GOTO(out, err = -EINVAL);
 904         }
 905
 906         switch(lcfg->lcfg_command) {
 907         case LCFG_SETUP: {
 908                 err = class_setup(obd, lcfg);
 909                 GOTO(out, err);
 910         }
 911         case LCFG_DETACH: {
 912                 err = class_detach(obd, lcfg);
 913                 GOTO(out, err = 0);
 914         }
 915         case LCFG_CLEANUP: {
 916                 err = class_cleanup(obd, lcfg);
 917                 GOTO(out, err = 0);
 918         }
 919         case LCFG_ADD_CONN: {
 920                 err = class_add_conn(obd, lcfg);
 921                 GOTO(out, err = 0);
 922         }
 923         case LCFG_DEL_CONN: {
 924                 err = class_del_conn(obd, lcfg);
 925                 GOTO(out, err = 0);
 926         }
 927         case LCFG_POOL_NEW: {
 928                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
 929                 GOTO(out, err = 0);
 930                 break;
 931         }
 932         case LCFG_POOL_ADD: {
 933                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
 934                                    lustre_cfg_string(lcfg, 3));
 935                 GOTO(out, err = 0);
 936                 break;
 937         }
 938         case LCFG_POOL_REM: {
 939                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
 940                                    lustre_cfg_string(lcfg, 3));
 941                 GOTO(out, err = 0);
 942                 break;
 943         }
 944         case LCFG_POOL_DEL: {
 945                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
 946                 GOTO(out, err = 0);
 947                 break;
 948         }
 949         default: {
 950                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
 951                 GOTO(out, err);
 952
 953         }
 954         }
 955 out:
 956         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
 957                 CWARN("Ignoring error %d on optional command %#x\n", err,
 958                       lcfg->lcfg_command);
 959                 err = 0;
 960         }
 961         return err;
 962 }
 963
 964 int class_process_proc_param(char *prefix, struct lprocfs_vars *lvars,
 965                              struct lustre_cfg *lcfg, void *data)
 966 {
 967 #ifdef __KERNEL__
 968         struct lprocfs_vars *var;
 969         char *key, *sval;
 970         int i, keylen, vallen;
 971         int matched = 0, j = 0;
 972         int rc = 0;
 973         int skip = 0;
 974         ENTRY;
 975
 976         if (lcfg->lcfg_command != LCFG_PARAM) {
 977                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 978                 RETURN(-EINVAL);
 979         }
 980
 981         /* e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
 982            or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
 983            or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36 */
 984         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
 985                 key = lustre_cfg_buf(lcfg, i);
 986                 /* Strip off prefix */
 987                 class_match_param(key, prefix, &key);
 988                 sval = strchr(key, '=');
 989                 if (!sval || (*(sval + 1) == 0)) {
 990                         CERROR("Can't parse param %s (missing '=')\n", key);
 991                         /* rc = -EINVAL; continue parsing other params */
 992                         continue;
 993                 }
 994                 keylen = sval - key;
 995                 sval++;
 996                 vallen = strlen(sval);
 997                 matched = 0;
 998                 j = 0;
 999                 /* Search proc entries */
1000                 while (lvars[j].name) {
1001                         var = &lvars[j];
1002                         if (class_match_param(key, (char *)var->name, 0) == 0 &&
1003                             keylen == strlen(var->name)) {
1004                                 matched++;
1005                                 rc = -EROFS;
1006                                 if (var->write_fptr) {
1007                                         mm_segment_t oldfs;
1008                                         oldfs = get_fs();
1009                                         set_fs(KERNEL_DS);
1010                                         rc = (var->write_fptr)(NULL, sval,
1011                                                                vallen, data);
1012                                         set_fs(oldfs);
1013                                 }
1014                                 break;
1015                         }
1016                         j++;
1017                 }
1018                 if (!matched) {
1019                         /* If the prefix doesn't match, return error so we
1020                            can pass it down the stack */
1021                         if (strnchr(key, keylen, '.'))
1022                             RETURN(-ENOSYS);
1023                         CERROR("%s: unknown param %s\n",
1024                                (char *)lustre_cfg_string(lcfg, 0), key);
1025                         /* rc = -EINVAL;        continue parsing other params */
1026                         skip++;
1027                 } else if (rc < 0) {
1028                         CERROR("writing proc entry %s err %d\n",
1029                                var->name, rc);
1030                         rc = 0;
1031                 } else {
1032                         LCONSOLE_INFO("%s.%.*s: set parameter %.*s=%s\n",
1033                                       lustre_cfg_string(lcfg, 0),
1034                                       (int)strlen(prefix) - 1, prefix,
1035                                       (int)(sval - key - 1), key, sval);
1036                 }
1037         }
1038
1039         if (rc > 0)
1040                 rc = 0;
1041         if (!rc && skip)
1042                 rc = skip;
1043         RETURN(rc);
1044 #else
1045         CDEBUG(D_CONFIG, "liblustre can't process params.\n");
1046         /* Don't throw config error */
1047         RETURN(0);
1048 #endif
1049 }
1050
1051 int class_config_dump_handler(struct llog_handle * handle,
1052                               struct llog_rec_hdr *rec, void *data);
1053
1054 #ifdef __KERNEL__
1055 extern int lustre_check_exclusion(struct super_block *sb, char *svname);
1056 #else
1057 #define lustre_check_exclusion(a,b)  0
1058 #endif
1059
1060 static int class_config_llog_handler(struct llog_handle * handle,
1061                                      struct llog_rec_hdr *rec, void *data)
1062 {
1063         struct config_llog_instance *clli = data;
1064         int cfg_len = rec->lrh_len;
1065         char *cfg_buf = (char*) (rec + 1);
1066         int rc = 0;
1067         ENTRY;
1068
1069         //class_config_dump_handler(handle, rec, data);
1070
1071         switch (rec->lrh_type) {
1072         case OBD_CFG_REC: {
1073                 struct lustre_cfg *lcfg, *lcfg_new;
1074                 struct lustre_cfg_bufs bufs;
1075                 char *inst_name = NULL;
1076                 int inst_len = 0;
1077                 int inst = 0, swab = 0;
1078
1079                 lcfg = (struct lustre_cfg *)cfg_buf;
1080                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1081                         lustre_swab_lustre_cfg(lcfg);
1082                         swab = 1;
1083                 }
1084
1085                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1086                 if (rc)
1087                         GOTO(out, rc);
1088
1089                 /* Figure out config state info */
1090                 if (lcfg->lcfg_command == LCFG_MARKER) {
1091                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1092                         lustre_swab_cfg_marker(marker, swab,
1093                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1094                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1095                                clli->cfg_flags, marker->cm_flags);
1096                         if (marker->cm_flags & CM_START) {
1097                                 /* all previous flags off */
1098                                 clli->cfg_flags = CFG_F_MARKER;
1099                                 if (marker->cm_flags & CM_SKIP) {
1100                                         clli->cfg_flags |= CFG_F_SKIP;
1101                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1102                                                marker->cm_step);
1103                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1104                                            (clli->cfg_sb &&
1105                                             lustre_check_exclusion(clli->cfg_sb,
1106                                                          marker->cm_tgtname))) {
1107                                         clli->cfg_flags |= CFG_F_EXCLUDE;
1108                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1109                                                marker->cm_step);
1110                                 }
1111                         } else if (marker->cm_flags & CM_END) {
1112                                 clli->cfg_flags = 0;
1113                         }
1114                 }
1115                 /* A config command without a start marker before it is
1116                    illegal (post 146) */
1117                 if (!(clli->cfg_flags & CFG_F_COMPAT146) &&
1118                     !(clli->cfg_flags & CFG_F_MARKER) &&
1119                     (lcfg->lcfg_command != LCFG_MARKER)) {
1120                         CWARN("Config not inside markers, ignoring! "
1121                               "(inst: %s, uuid: %s, flags: %#x)\n",
1122                               clli->cfg_instance ? clli->cfg_instance : "<null>",
1123                               clli->cfg_uuid.uuid, clli->cfg_flags);
1124                         clli->cfg_flags |= CFG_F_SKIP;
1125                 }
1126                 if (clli->cfg_flags & CFG_F_SKIP) {
1127                         CDEBUG(D_CONFIG, "skipping %#x\n",
1128                                clli->cfg_flags);
1129                         rc = 0;
1130                         /* No processing! */
1131                         break;
1132                 }
1133
1134                 /*
1135                  * For interoperability between 1.8 and 2.0,
1136                  * rename "mds" obd device type to "mdt".
1137                  */
1138                 {
1139                         char *typename = lustre_cfg_string(lcfg, 1);
1140                         char *index = lustre_cfg_string(lcfg, 2);
1141
1142                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1143                              strcmp(typename, "mds") == 0)) {
1144                                 CWARN("For 1.8 interoperability, rename obd "
1145                                        "type from mds to mdt\n");
1146                                 typename[2] = 't';
1147                         }
1148                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1149                              strcmp(index, "type") == 0)) {
1150                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1151                                        "set this index to '0'\n");
1152                                 index[0] = '0';
1153                                 index[1] = 0;
1154                         }
1155                 }
1156
1157                 if ((clli->cfg_flags & CFG_F_EXCLUDE) &&
1158                     (lcfg->lcfg_command == LCFG_LOV_ADD_OBD))
1159                         /* Add inactive instead */
1160                         lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1161
1162                 lustre_cfg_bufs_init(&bufs, lcfg);
1163
1164                 if (clli && clli->cfg_instance &&
1165                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0){
1166                         inst = 1;
1167                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1168                                 strlen(clli->cfg_instance) + 1;
1169                         OBD_ALLOC(inst_name, inst_len);
1170                         if (inst_name == NULL)
1171                                 GOTO(out, rc = -ENOMEM);
1172                         sprintf(inst_name, "%s-%s",
1173                                 lustre_cfg_string(lcfg, 0),
1174                                 clli->cfg_instance);
1175                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1176                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1177                                lcfg->lcfg_command, inst_name);
1178                 }
1179
1180                 /* we override the llog's uuid for clients, to insure they
1181                 are unique */
1182                 if (clli && clli->cfg_instance &&
1183                     lcfg->lcfg_command == LCFG_ATTACH) {
1184                         lustre_cfg_bufs_set_string(&bufs, 2,
1185                                                    clli->cfg_uuid.uuid);
1186                 }
1187                 /*
1188                  * sptlrpc config record, we expect 2 data segments:
1189                  *  [0]: fs_name/target_name,
1190                  *  [1]: rule string
1191                  * moving them to index [1] and [2], and insert MGC's
1192                  * obdname at index [0].
1193                  */
1194                 if (clli && clli->cfg_instance == NULL &&
1195                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1196                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1197                                             bufs.lcfg_buflen[1]);
1198                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1199                                             bufs.lcfg_buflen[0]);
1200                         lustre_cfg_bufs_set_string(&bufs, 0,
1201                                                    clli->cfg_obdname);
1202                 }
1203
1204                 lcfg_new = lustre_cfg_new(lcfg->lcfg_command, &bufs);
1205
1206                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1207                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1208
1209                 /* XXX Hack to try to remain binary compatible with
1210                  * pre-newconfig logs */
1211                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1212                     (lcfg->lcfg_nid >> 32) == 0) {
1213                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1214
1215                         lcfg_new->lcfg_nid =
1216                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1217                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
1218                               lcfg->lcfg_nal, addr,
1219                               libcfs_nid2str(lcfg_new->lcfg_nid));
1220                 } else {
1221                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
1222                 }
1223
1224                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
1225
1226                 rc = class_process_config(lcfg_new);
1227                 lustre_cfg_free(lcfg_new);
1228
1229                 if (inst)
1230                         OBD_FREE(inst_name, inst_len);
1231                 break;
1232         }
1233         default:
1234                 CERROR("Unknown llog record type %#x encountered\n",
1235                        rec->lrh_type);
1236                 break;
1237         }
1238 out:
1239         if (rc) {
1240                 CERROR("Err %d on cfg command:\n", rc);
1241                 class_config_dump_handler(handle, rec, data);
1242         }
1243         RETURN(rc);
1244 }
1245
1246 int class_config_parse_llog(struct llog_ctxt *ctxt, char *name,
1247                             struct config_llog_instance *cfg)
1248 {
1249         struct llog_process_cat_data cd = {0, 0};
1250         struct llog_handle *llh;
1251         int rc, rc2;
1252         ENTRY;
1253
1254         CDEBUG(D_INFO, "looking up llog %s\n", name);
1255         rc = llog_create(ctxt, &llh, NULL, name);
1256         if (rc)
1257                 RETURN(rc);
1258
1259         rc = llog_init_handle(llh, LLOG_F_IS_PLAIN, NULL);
1260         if (rc)
1261                 GOTO(parse_out, rc);
1262
1263         /* continue processing from where we last stopped to end-of-log */
1264         if (cfg)
1265                 cd.lpcd_first_idx = cfg->cfg_last_idx;
1266         cd.lpcd_last_idx = 0;
1267
1268         rc = llog_process(llh, class_config_llog_handler, cfg, &cd);
1269
1270         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
1271                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
1272
1273         if (cfg)
1274                 cfg->cfg_last_idx = cd.lpcd_last_idx;
1275
1276 parse_out:
1277         rc2 = llog_close(llh);
1278         if (rc == 0)
1279                 rc = rc2;
1280
1281         RETURN(rc);
1282 }
1283
1284 int class_config_dump_handler(struct llog_handle * handle,
1285                               struct llog_rec_hdr *rec, void *data)
1286 {
1287         int cfg_len = rec->lrh_len;
1288         char *cfg_buf = (char*) (rec + 1);
1289         char *outstr, *ptr, *end;
1290         int rc = 0;
1291         ENTRY;
1292
1293         OBD_ALLOC(outstr, 256);
1294         end = outstr + 256;
1295         ptr = outstr;
1296         if (!outstr) {
1297                 RETURN(-ENOMEM);
1298         }
1299         if (rec->lrh_type == OBD_CFG_REC) {
1300                 struct lustre_cfg *lcfg;
1301                 int i;
1302
1303                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1304                 if (rc)
1305                         GOTO(out, rc);
1306                 lcfg = (struct lustre_cfg *)cfg_buf;
1307
1308                 ptr += snprintf(ptr, end-ptr, "cmd=%05x ",
1309                                 lcfg->lcfg_command);
1310                 if (lcfg->lcfg_flags) {
1311                         ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
1312                                         lcfg->lcfg_flags);
1313                 }
1314                 if (lcfg->lcfg_num) {
1315                         ptr += snprintf(ptr, end-ptr, "num=%#08x ",
1316                                         lcfg->lcfg_num);
1317                 }
1318                 if (lcfg->lcfg_nid) {
1319                         ptr += snprintf(ptr, end-ptr, "nid=%s("LPX64")\n     ",
1320                                         libcfs_nid2str(lcfg->lcfg_nid),
1321                                         lcfg->lcfg_nid);
1322                 }
1323                 if (lcfg->lcfg_command == LCFG_MARKER) {
1324                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1325                         ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
1326                                         marker->cm_step, marker->cm_flags,
1327                                         marker->cm_tgtname, marker->cm_comment);
1328                 } else {
1329                         for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
1330                                 ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
1331                                                 lustre_cfg_string(lcfg, i));
1332                         }
1333                 }
1334                 LCONSOLE(D_WARNING, "   %s\n", outstr);
1335         } else {
1336                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
1337                 rc = -EINVAL;
1338         }
1339 out:
1340         OBD_FREE(outstr, 256);
1341         RETURN(rc);
1342 }
1343
1344 int class_config_dump_llog(struct llog_ctxt *ctxt, char *name,
1345                            struct config_llog_instance *cfg)
1346 {
1347         struct llog_handle *llh;
1348         int rc, rc2;
1349         ENTRY;
1350
1351         LCONSOLE_INFO("Dumping config log %s\n", name);
1352
1353         rc = llog_create(ctxt, &llh, NULL, name);
1354         if (rc)
1355                 RETURN(rc);
1356
1357         rc = llog_init_handle(llh, LLOG_F_IS_PLAIN, NULL);
1358         if (rc)
1359                 GOTO(parse_out, rc);
1360
1361         rc = llog_process(llh, class_config_dump_handler, cfg, NULL);
1362 parse_out:
1363         rc2 = llog_close(llh);
1364         if (rc == 0)
1365                 rc = rc2;
1366
1367         LCONSOLE_INFO("End config log %s\n", name);
1368         RETURN(rc);
1369
1370 }
1371
1372 /* Cleanup and detach */
1373 int class_manual_cleanup(struct obd_device *obd)
1374 {
1375         char                    flags[3] = "";
1376         struct lustre_cfg      *lcfg;
1377         struct lustre_cfg_bufs  bufs;
1378         int                     rc;
1379         ENTRY;
1380
1381         if (!obd) {
1382                 CERROR("empty cleanup\n");
1383                 RETURN(-EALREADY);
1384         }
1385
1386         if (obd->obd_force)
1387                 strcat(flags, "F");
1388         if (obd->obd_fail)
1389                 strcat(flags, "A");
1390
1391         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
1392                obd->obd_name, flags);
1393
1394         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
1395         lustre_cfg_bufs_set_string(&bufs, 1, flags);
1396         lcfg = lustre_cfg_new(LCFG_CLEANUP, &bufs);
1397         if (!lcfg)
1398                 RETURN(-ENOMEM);
1399
1400         rc = class_process_config(lcfg);
1401         if (rc) {
1402                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
1403                 GOTO(out, rc);
1404         }
1405
1406         /* the lcfg is almost the same for both ops */
1407         lcfg->lcfg_command = LCFG_DETACH;
1408         rc = class_process_config(lcfg);
1409         if (rc)
1410                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
1411 out:
1412         lustre_cfg_free(lcfg);
1413         RETURN(rc);
1414 }
1415
1416 /*
1417  * uuid<->export lustre hash operations
1418  */
1419
1420 static unsigned
1421 uuid_hash(lustre_hash_t *lh,  void *key, unsigned mask)
1422 {
1423         return lh_djb2_hash(((struct obd_uuid *)key)->uuid,
1424                             sizeof(((struct obd_uuid *)key)->uuid), mask);
1425 }
1426
1427 static void *
1428 uuid_key(struct hlist_node *hnode)
1429 {
1430         struct obd_export *exp;
1431
1432         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1433
1434         RETURN(&exp->exp_client_uuid);
1435 }
1436
1437 /*
1438  * NOTE: It is impossible to find an export that is in failed
1439  *       state with this function
1440  */
1441 static int
1442 uuid_compare(void *key, struct hlist_node *hnode)
1443 {
1444         struct obd_export *exp;
1445
1446         LASSERT(key);
1447         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1448
1449         RETURN(obd_uuid_equals((struct obd_uuid *)key,&exp->exp_client_uuid) &&
1450                !exp->exp_failed);
1451 }
1452
1453 static void *
1454 uuid_export_get(struct hlist_node *hnode)
1455 {
1456         struct obd_export *exp;
1457
1458         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1459         class_export_get(exp);
1460
1461         RETURN(exp);
1462 }
1463
1464 static void *
1465 uuid_export_put(struct hlist_node *hnode)
1466 {
1467         struct obd_export *exp;
1468
1469         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1470         class_export_put(exp);
1471
1472         RETURN(exp);
1473 }
1474
1475 static lustre_hash_ops_t uuid_hash_ops = {
1476         .lh_hash    = uuid_hash,
1477         .lh_key     = uuid_key,
1478         .lh_compare = uuid_compare,
1479         .lh_get     = uuid_export_get,
1480         .lh_put     = uuid_export_put,
1481 };
1482
1483
1484 /*
1485  * nid<->export hash operations
1486  */
1487
1488 static unsigned
1489 nid_hash(lustre_hash_t *lh,  void *key, unsigned mask)
1490 {
1491         return lh_djb2_hash(key, sizeof(lnet_nid_t), mask);
1492 }
1493
1494 static void *
1495 nid_key(struct hlist_node *hnode)
1496 {
1497         struct obd_export *exp;
1498
1499         exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
1500
1501         RETURN(&exp->exp_connection->c_peer.nid);
1502 }
1503
1504 /*
1505  * NOTE: It is impossible to find an export that is in failed
1506  *       state with this function
1507  */
1508 static int
1509 nid_compare(void *key, struct hlist_node *hnode)
1510 {
1511         struct obd_export *exp;
1512
1513         LASSERT(key);
1514         exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
1515
1516         RETURN(exp->exp_connection->c_peer.nid == *(lnet_nid_t *)key &&
1517                !exp->exp_failed);
1518 }
1519
1520 static void *
1521 nid_export_get(struct hlist_node *hnode)
1522 {
1523         struct obd_export *exp;
1524
1525         exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
1526         class_export_get(exp);
1527
1528         RETURN(exp);
1529 }
1530
1531 static void *
1532 nid_export_put(struct hlist_node *hnode)
1533 {
1534         struct obd_export *exp;
1535
1536         exp = hlist_entry(hnode, struct obd_export, exp_nid_hash);
1537         class_export_put(exp);
1538
1539         RETURN(exp);
1540 }
1541
1542 static lustre_hash_ops_t nid_hash_ops = {
1543         .lh_hash    = nid_hash,
1544         .lh_key     = nid_key,
1545         .lh_compare = nid_compare,
1546         .lh_get     = nid_export_get,
1547         .lh_put     = nid_export_put,
1548 };
1549
1550
1551 /*
1552  * nid<->nidstats hash operations
1553  */
1554
1555 static void *
1556 nidstats_key(struct hlist_node *hnode)
1557 {
1558         struct nid_stat *ns;
1559
1560         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
1561
1562         RETURN(&ns->nid);
1563 }
1564
1565 static int
1566 nidstats_compare(void *key, struct hlist_node *hnode)
1567 {
1568         RETURN(*(lnet_nid_t *)nidstats_key(hnode) == *(lnet_nid_t *)key);
1569 }
1570
1571 static void *
1572 nidstats_get(struct hlist_node *hnode)
1573 {
1574         struct nid_stat *ns;
1575
1576         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
1577         ns->nid_exp_ref_count++;
1578
1579         RETURN(ns);
1580 }
1581
1582 static void *
1583 nidstats_put(struct hlist_node *hnode)
1584 {
1585         struct nid_stat *ns;
1586
1587         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
1588         ns->nid_exp_ref_count--;
1589
1590         RETURN(ns);
1591 }
1592
1593 static lustre_hash_ops_t nid_stat_hash_ops = {
1594         .lh_hash    = nid_hash,
1595         .lh_key     = nidstats_key,
1596         .lh_compare = nidstats_compare,
1597         .lh_get     = nidstats_get,
1598         .lh_put     = nidstats_put,
1599 };