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
  55 static cfs_hash_ops_t uuid_hash_ops;
  56 static cfs_hash_ops_t nid_hash_ops;
  57 static cfs_hash_ops_t nid_stat_hash_ops;
  58
  59 /*********** string parsing utils *********/
  60
  61 /* returns 0 if we find this key in the buffer, else 1 */
  62 int class_find_param(char *buf, char *key, char **valp)
  63 {
  64         char *ptr;
  65
  66         if (!buf)
  67                 return 1;
  68
  69         if ((ptr = strstr(buf, key)) == NULL)
  70                 return 1;
  71
  72         if (valp)
  73                 *valp = ptr + strlen(key);
  74
  75         return 0;
  76 }
  77
  78 /**
  79  * Finds a parameter in \a params and copies it to \a copy.
  80  *
  81  * Leading spaces are skipped. Next space or end of string is the
  82  * parameter terminator with the exception that spaces inside single or double
  83  * quotes get included into a parameter. The parameter is copied into \a copy
  84  * which has to be allocated big enough by a caller, quotes are stripped in
  85  * the copy and the copy is terminated by 0.
  86  *
  87  * On return \a params is set to next parameter or to NULL if last
  88  * parameter is returned.
  89  *
  90  * \retval 0 if parameter is returned in \a copy
  91  * \retval 1 otherwise
  92  * \retval -EINVAL if unbalanced quota is found
  93  */
  94 int class_get_next_param(char **params, char *copy)
  95 {
  96         char *q1, *q2, *str;
  97         int len;
  98
  99         str = *params;
 100         while (*str == ' ')
 101                 str++;
 102
 103         if (*str == '\0') {
 104                 *params = NULL;
 105                 return 1;
 106         }
 107
 108         while (1) {
 109                 q1 = strpbrk(str, " '\"");
 110                 if (q1 == NULL) {
 111                         len = strlen(str);
 112                         memcpy(copy, str, len);
 113                         copy[len] = '\0';
 114                         *params = NULL;
 115                         return 0;
 116                 }
 117                 len = q1 - str;
 118                 if (*q1 == ' ') {
 119                         memcpy(copy, str, len);
 120                         copy[len] = '\0';
 121                         *params = str + len;
 122                         return 0;
 123                 }
 124
 125                 memcpy(copy, str, len);
 126                 copy += len;
 127
 128                 /* search for the matching closing quote */
 129                 str = q1 + 1;
 130                 q2 = strchr(str, *q1);
 131                 if (q2 == NULL) {
 132                         CERROR("Unbalanced quota in parameters: \"%s\"\n",
 133                                *params);
 134                         return -EINVAL;
 135                 }
 136                 len = q2 - str;
 137                 memcpy(copy, str, len);
 138                 copy += len;
 139                 str = q2 + 1;
 140         }
 141         return 1;
 142 }
 143
 144 /* returns 0 if this is the first key in the buffer, else 1.
 145    valp points to first char after key. */
 146 int class_match_param(char *buf, char *key, char **valp)
 147 {
 148         if (!buf)
 149                 return 1;
 150
 151         if (memcmp(buf, key, strlen(key)) != 0)
 152                 return 1;
 153
 154         if (valp)
 155                 *valp = buf + strlen(key);
 156
 157         return 0;
 158 }
 159
 160 /* 0 is good nid,
 161    1 not found
 162    < 0 error
 163    endh is set to next separator */
 164 int class_parse_nid(char *buf, lnet_nid_t *nid, char **endh)
 165 {
 166         char tmp, *endp;
 167
 168         if (!buf)
 169                 return 1;
 170         while (*buf == ',' || *buf == ':')
 171                 buf++;
 172         if (*buf == ' ' || *buf == '/' || *buf == '\0')
 173                 return 1;
 174
 175         /* nid separators or end of nids */
 176         endp = strpbrk(buf, ",: /");
 177         if (endp == NULL)
 178                 endp = buf + strlen(buf);
 179
 180         tmp = *endp;
 181         *endp = '\0';
 182         *nid = libcfs_str2nid(buf);
 183         if (*nid == LNET_NID_ANY) {
 184                 LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
 185                 *endp = tmp;
 186                 return -EINVAL;
 187         }
 188         *endp = tmp;
 189
 190         if (endh)
 191                 *endh = endp;
 192         CDEBUG(D_INFO, "Nid %s\n", libcfs_nid2str(*nid));
 193         return 0;
 194 }
 195
 196 EXPORT_SYMBOL(class_find_param);
 197 EXPORT_SYMBOL(class_get_next_param);
 198 EXPORT_SYMBOL(class_match_param);
 199 EXPORT_SYMBOL(class_parse_nid);
 200
 201 /********************** class fns **********************/
 202
 203 /**
 204  * Create a new device and set the type, name and uuid.  If successful, the new
 205  * device can be accessed by either name or uuid.
 206  */
 207 int class_attach(struct lustre_cfg *lcfg)
 208 {
 209         struct obd_device *obd = NULL;
 210         char *typename, *name, *uuid;
 211         int rc, len;
 212         ENTRY;
 213
 214         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 215                 CERROR("No type passed!\n");
 216                 RETURN(-EINVAL);
 217         }
 218         typename = lustre_cfg_string(lcfg, 1);
 219
 220         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 221                 CERROR("No name passed!\n");
 222                 RETURN(-EINVAL);
 223         }
 224         name = lustre_cfg_string(lcfg, 0);
 225
 226         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 227                 CERROR("No UUID passed!\n");
 228                 RETURN(-EINVAL);
 229         }
 230         uuid = lustre_cfg_string(lcfg, 2);
 231
 232         CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 233                MKSTR(typename), MKSTR(name), MKSTR(uuid));
 234
 235         obd = class_newdev(typename, name);
 236         if (IS_ERR(obd)) {
 237                 /* Already exists or out of obds */
 238                 rc = PTR_ERR(obd);
 239                 obd = NULL;
 240                 CERROR("Cannot create device %s of type %s : %d\n",
 241                        name, typename, rc);
 242                 GOTO(out, rc);
 243         }
 244         LASSERTF(obd != NULL, "Cannot get obd device %s of type %s\n",
 245                  name, typename);
 246         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 247                  "obd %p obd_magic %08X != %08X\n",
 248                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 249         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 250                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 251
 252         cfs_rwlock_init(&obd->obd_pool_lock);
 253         obd->obd_pool_limit = 0;
 254         obd->obd_pool_slv = 0;
 255
 256         CFS_INIT_LIST_HEAD(&obd->obd_exports);
 257         CFS_INIT_LIST_HEAD(&obd->obd_unlinked_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         cfs_spin_lock_init(&obd->obd_nid_lock);
 262         cfs_spin_lock_init(&obd->obd_dev_lock);
 263         cfs_sema_init(&obd->obd_dev_sem, 1);
 264         cfs_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         cfs_init_rwsem(&obd->obd_observer_link_sem);
 271         /* recovery data */
 272         cfs_init_timer(&obd->obd_recovery_timer);
 273         cfs_spin_lock_init(&obd->obd_processing_task_lock);
 274         cfs_waitq_init(&obd->obd_next_transno_waitq);
 275         cfs_waitq_init(&obd->obd_evict_inprogress_waitq);
 276         CFS_INIT_LIST_HEAD(&obd->obd_req_replay_queue);
 277         CFS_INIT_LIST_HEAD(&obd->obd_lock_replay_queue);
 278         CFS_INIT_LIST_HEAD(&obd->obd_final_req_queue);
 279         CFS_INIT_LIST_HEAD(&obd->obd_evict_list);
 280
 281         llog_group_init(&obd->obd_olg, FILTER_GROUP_LLOG);
 282
 283         len = strlen(uuid);
 284         if (len >= sizeof(obd->obd_uuid)) {
 285                 CERROR("uuid must be < %d bytes long\n",
 286                        (int)sizeof(obd->obd_uuid));
 287                 GOTO(out, rc = -EINVAL);
 288         }
 289         memcpy(obd->obd_uuid.uuid, uuid, len);
 290
 291         /* do the attach */
 292         if (OBP(obd, attach)) {
 293                 rc = OBP(obd,attach)(obd, sizeof *lcfg, lcfg);
 294                 if (rc)
 295                         GOTO(out, rc = -EINVAL);
 296         }
 297
 298         /* Detach drops this */
 299         cfs_spin_lock(&obd->obd_dev_lock);
 300         cfs_atomic_set(&obd->obd_refcount, 1);
 301         cfs_spin_unlock(&obd->obd_dev_lock);
 302         lu_ref_init(&obd->obd_reference);
 303         lu_ref_add(&obd->obd_reference, "attach", obd);
 304
 305         obd->obd_attached = 1;
 306         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 307                obd->obd_minor, typename, cfs_atomic_read(&obd->obd_refcount));
 308         RETURN(0);
 309  out:
 310         if (obd != NULL) {
 311                 class_release_dev(obd);
 312         }
 313         return rc;
 314 }
 315
 316 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 317 {
 318         int err = 0;
 319         struct obd_export *exp;
 320         ENTRY;
 321
 322         LASSERT(obd != NULL);
 323         LASSERTF(obd == class_num2obd(obd->obd_minor),
 324                  "obd %p != obd_devs[%d] %p\n",
 325                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 326         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 327                  "obd %p obd_magic %08x != %08x\n",
 328                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 329
 330         /* have we attached a type to this device? */
 331         if (!obd->obd_attached) {
 332                 CERROR("Device %d not attached\n", obd->obd_minor);
 333                 RETURN(-ENODEV);
 334         }
 335
 336         if (obd->obd_set_up) {
 337                 CERROR("Device %d already setup (type %s)\n",
 338                        obd->obd_minor, obd->obd_type->typ_name);
 339                 RETURN(-EEXIST);
 340         }
 341
 342         /* is someone else setting us up right now? (attach inits spinlock) */
 343         cfs_spin_lock(&obd->obd_dev_lock);
 344         if (obd->obd_starting) {
 345                 cfs_spin_unlock(&obd->obd_dev_lock);
 346                 CERROR("Device %d setup in progress (type %s)\n",
 347                        obd->obd_minor, obd->obd_type->typ_name);
 348                 RETURN(-EEXIST);
 349         }
 350         /* just leave this on forever.  I can't use obd_set_up here because
 351            other fns check that status, and we're not actually set up yet. */
 352         obd->obd_starting = 1;
 353         obd->obd_uuid_hash = NULL;
 354         obd->obd_nid_hash = NULL;
 355         obd->obd_nid_stats_hash = NULL;
 356         cfs_spin_unlock(&obd->obd_dev_lock);
 357
 358         /* create an uuid-export lustre hash */
 359         obd->obd_uuid_hash = cfs_hash_create("UUID_HASH",
 360                                              HASH_UUID_CUR_BITS,
 361                                              HASH_UUID_CUR_BITS,
 362                                              &uuid_hash_ops, 0);
 363         if (!obd->obd_uuid_hash)
 364                 GOTO(err_hash, err = -ENOMEM);
 365
 366         /* create a nid-export lustre hash */
 367         obd->obd_nid_hash = cfs_hash_create("NID_HASH",
 368                                             HASH_NID_CUR_BITS,
 369                                             HASH_NID_CUR_BITS,
 370                                             &nid_hash_ops, 0);
 371         if (!obd->obd_nid_hash)
 372                 GOTO(err_hash, err = -ENOMEM);
 373
 374         /* create a nid-stats lustre hash */
 375         obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
 376                                                   HASH_NID_STATS_CUR_BITS,
 377                                                   HASH_NID_STATS_CUR_BITS,
 378                                                   &nid_stat_hash_ops, 0);
 379         if (!obd->obd_nid_stats_hash)
 380                 GOTO(err_hash, err = -ENOMEM);
 381
 382         exp = class_new_export(obd, &obd->obd_uuid);
 383         if (IS_ERR(exp))
 384                 GOTO(err_hash, err = PTR_ERR(exp));
 385
 386         obd->obd_self_export = exp;
 387         cfs_list_del_init(&exp->exp_obd_chain_timed);
 388         class_export_put(exp);
 389
 390         err = obd_setup(obd, lcfg);
 391         if (err)
 392                 GOTO(err_exp, err);
 393
 394         obd->obd_set_up = 1;
 395
 396         cfs_spin_lock(&obd->obd_dev_lock);
 397         /* cleanup drops this */
 398         class_incref(obd, "setup", obd);
 399         cfs_spin_unlock(&obd->obd_dev_lock);
 400
 401         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 402                obd->obd_name, obd->obd_uuid.uuid);
 403
 404         RETURN(0);
 405 err_exp:
 406         if (obd->obd_self_export) {
 407                 class_unlink_export(obd->obd_self_export);
 408                 obd->obd_self_export = NULL;
 409         }
 410 err_hash:
 411         if (obd->obd_uuid_hash) {
 412                 cfs_hash_destroy(obd->obd_uuid_hash);
 413                 obd->obd_uuid_hash = NULL;
 414         }
 415         if (obd->obd_nid_hash) {
 416                 cfs_hash_destroy(obd->obd_nid_hash);
 417                 obd->obd_nid_hash = NULL;
 418         }
 419         if (obd->obd_nid_stats_hash) {
 420                 cfs_hash_destroy(obd->obd_nid_stats_hash);
 421                 obd->obd_nid_stats_hash = NULL;
 422         }
 423         obd->obd_starting = 0;
 424         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 425         return err;
 426 }
 427
 428 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 429 {
 430         ENTRY;
 431
 432         if (obd->obd_set_up) {
 433                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 434                 RETURN(-EBUSY);
 435         }
 436
 437         cfs_spin_lock(&obd->obd_dev_lock);
 438         if (!obd->obd_attached) {
 439                 cfs_spin_unlock(&obd->obd_dev_lock);
 440                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 441                 RETURN(-ENODEV);
 442         }
 443         obd->obd_attached = 0;
 444         cfs_spin_unlock(&obd->obd_dev_lock);
 445
 446         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 447                obd->obd_name, obd->obd_uuid.uuid);
 448
 449         class_decref(obd, "attach", obd);
 450
 451         /* not strictly necessary, but cleans up eagerly */
 452         obd_zombie_impexp_cull();
 453
 454         RETURN(0);
 455 }
 456
 457 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 458 {
 459         int err = 0;
 460         char *flag;
 461         ENTRY;
 462
 463         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 464
 465         if (!obd->obd_set_up) {
 466                 CERROR("Device %d not setup\n", obd->obd_minor);
 467                 RETURN(-ENODEV);
 468         }
 469
 470         cfs_spin_lock(&obd->obd_dev_lock);
 471         if (obd->obd_stopping) {
 472                 cfs_spin_unlock(&obd->obd_dev_lock);
 473                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 474                 RETURN(-ENODEV);
 475         }
 476         /* Leave this on forever */
 477         obd->obd_stopping = 1;
 478         cfs_spin_unlock(&obd->obd_dev_lock);
 479
 480         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 481                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 482                         switch (*flag) {
 483                         case 'F':
 484                                 obd->obd_force = 1;
 485                                 break;
 486                         case 'A':
 487                                 LCONSOLE_WARN("Failing over %s\n",
 488                                               obd->obd_name);
 489                                 obd->obd_fail = 1;
 490                                 obd->obd_no_transno = 1;
 491                                 obd->obd_no_recov = 1;
 492                                 if (OBP(obd, iocontrol)) {
 493                                         obd_iocontrol(OBD_IOC_SYNC,
 494                                                       obd->obd_self_export,
 495                                                       0, NULL, NULL);
 496                                         /* Set the obd readonly if we can */
 497                                         obd_iocontrol(OBD_IOC_SET_READONLY,
 498                                                       obd->obd_self_export,
 499                                                       0, NULL, NULL);
 500                                 }
 501                                 break;
 502                         default:
 503                                 CERROR("Unrecognised flag '%c'\n", *flag);
 504                         }
 505         }
 506
 507         LASSERT(obd->obd_self_export);
 508
 509         /* The three references that should be remaining are the
 510          * obd_self_export and the attach and setup references. */
 511         if (cfs_atomic_read(&obd->obd_refcount) > 3) {
 512                 /* refcounf - 3 might be the number of real exports
 513                    (excluding self export). But class_incref is called
 514                    by other things as well, so don't count on it. */
 515                 CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d\n",
 516                        obd->obd_name, cfs_atomic_read(&obd->obd_refcount) - 3);
 517                 dump_exports(obd, 0);
 518                 class_disconnect_exports(obd);
 519         }
 520
 521         /* destroy an uuid-export hash body */
 522         if (obd->obd_uuid_hash) {
 523                 cfs_hash_destroy(obd->obd_uuid_hash);
 524                 obd->obd_uuid_hash = NULL;
 525         }
 526
 527         /* destroy a nid-export hash body */
 528         if (obd->obd_nid_hash) {
 529                 cfs_hash_destroy(obd->obd_nid_hash);
 530                 obd->obd_nid_hash = NULL;
 531         }
 532
 533         /* destroy a nid-stats hash body */
 534         if (obd->obd_nid_stats_hash) {
 535                 cfs_hash_destroy(obd->obd_nid_stats_hash);
 536                 obd->obd_nid_stats_hash = NULL;
 537         }
 538
 539         /* Precleanup, we must make sure all exports get destroyed. */
 540         err = obd_precleanup(obd, OBD_CLEANUP_EXPORTS);
 541         if (err)
 542                 CERROR("Precleanup %s returned %d\n",
 543                        obd->obd_name, err);
 544         class_decref(obd, "setup", obd);
 545         obd->obd_set_up = 0;
 546         RETURN(0);
 547 }
 548
 549 struct obd_device *class_incref(struct obd_device *obd,
 550                                 const char *scope, const void *source)
 551 {
 552         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 553         cfs_atomic_inc(&obd->obd_refcount);
 554         CDEBUG(D_INFO, "incref %s (%p) now %d\n", obd->obd_name, obd,
 555                cfs_atomic_read(&obd->obd_refcount));
 556
 557         return obd;
 558 }
 559
 560 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 561 {
 562         int err;
 563         int refs;
 564
 565         cfs_spin_lock(&obd->obd_dev_lock);
 566         cfs_atomic_dec(&obd->obd_refcount);
 567         refs = cfs_atomic_read(&obd->obd_refcount);
 568         cfs_spin_unlock(&obd->obd_dev_lock);
 569         lu_ref_del(&obd->obd_reference, scope, source);
 570
 571         CDEBUG(D_INFO, "Decref %s (%p) now %d\n", obd->obd_name, obd, refs);
 572
 573         if ((refs == 1) && obd->obd_stopping) {
 574                 /* All exports have been destroyed; there should
 575                    be no more in-progress ops by this point.*/
 576
 577                 cfs_spin_lock(&obd->obd_self_export->exp_lock);
 578                 obd->obd_self_export->exp_flags |= exp_flags_from_obd(obd);
 579                 cfs_spin_unlock(&obd->obd_self_export->exp_lock);
 580
 581                 /* note that we'll recurse into class_decref again */
 582                 class_unlink_export(obd->obd_self_export);
 583                 return;
 584         }
 585
 586         if (refs == 0) {
 587                 CDEBUG(D_CONFIG, "finishing cleanup of obd %s (%s)\n",
 588                        obd->obd_name, obd->obd_uuid.uuid);
 589                 LASSERT(!obd->obd_attached);
 590                 if (obd->obd_stopping) {
 591                         /* If we're not stopping, we were never set up */
 592                         err = obd_cleanup(obd);
 593                         if (err)
 594                                 CERROR("Cleanup %s returned %d\n",
 595                                        obd->obd_name, err);
 596                 }
 597                 if (OBP(obd, detach)) {
 598                         err = OBP(obd, detach)(obd);
 599                         if (err)
 600                                 CERROR("Detach returned %d\n", err);
 601                 }
 602                 class_release_dev(obd);
 603         }
 604 }
 605
 606 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 607 {
 608         struct obd_import *imp;
 609         struct obd_uuid uuid;
 610         int rc;
 611         ENTRY;
 612
 613         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 614             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 615                 CERROR("invalid conn_uuid\n");
 616                 RETURN(-EINVAL);
 617         }
 618         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 619             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
 620             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
 621                 CERROR("can't add connection on non-client dev\n");
 622                 RETURN(-EINVAL);
 623         }
 624
 625         imp = obd->u.cli.cl_import;
 626         if (!imp) {
 627                 CERROR("try to add conn on immature client dev\n");
 628                 RETURN(-EINVAL);
 629         }
 630
 631         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 632         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
 633
 634         RETURN(rc);
 635 }
 636
 637 int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 638 {
 639         struct obd_import *imp;
 640         struct obd_uuid uuid;
 641         int rc;
 642         ENTRY;
 643
 644         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 645             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 646                 CERROR("invalid conn_uuid\n");
 647                 RETURN(-EINVAL);
 648         }
 649         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 650             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 651                 CERROR("can't del connection on non-client dev\n");
 652                 RETURN(-EINVAL);
 653         }
 654
 655         imp = obd->u.cli.cl_import;
 656         if (!imp) {
 657                 CERROR("try to del conn on immature client dev\n");
 658                 RETURN(-EINVAL);
 659         }
 660
 661         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 662         rc = obd_del_conn(imp, &uuid);
 663
 664         RETURN(rc);
 665 }
 666
 667 CFS_LIST_HEAD(lustre_profile_list);
 668
 669 struct lustre_profile *class_get_profile(const char * prof)
 670 {
 671         struct lustre_profile *lprof;
 672
 673         ENTRY;
 674         cfs_list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
 675                 if (!strcmp(lprof->lp_profile, prof)) {
 676                         RETURN(lprof);
 677                 }
 678         }
 679         RETURN(NULL);
 680 }
 681
 682 int class_add_profile(int proflen, char *prof, int osclen, char *osc,
 683                       int mdclen, char *mdc)
 684 {
 685         struct lustre_profile *lprof;
 686         int err = 0;
 687         ENTRY;
 688
 689         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
 690
 691         OBD_ALLOC(lprof, sizeof(*lprof));
 692         if (lprof == NULL)
 693                 RETURN(-ENOMEM);
 694         CFS_INIT_LIST_HEAD(&lprof->lp_list);
 695
 696         LASSERT(proflen == (strlen(prof) + 1));
 697         OBD_ALLOC(lprof->lp_profile, proflen);
 698         if (lprof->lp_profile == NULL)
 699                 GOTO(out, err = -ENOMEM);
 700         memcpy(lprof->lp_profile, prof, proflen);
 701
 702         LASSERT(osclen == (strlen(osc) + 1));
 703         OBD_ALLOC(lprof->lp_dt, osclen);
 704         if (lprof->lp_dt == NULL)
 705                 GOTO(out, err = -ENOMEM);
 706         memcpy(lprof->lp_dt, osc, osclen);
 707
 708         if (mdclen > 0) {
 709                 LASSERT(mdclen == (strlen(mdc) + 1));
 710                 OBD_ALLOC(lprof->lp_md, mdclen);
 711                 if (lprof->lp_md == NULL)
 712                         GOTO(out, err = -ENOMEM);
 713                 memcpy(lprof->lp_md, mdc, mdclen);
 714         }
 715
 716         cfs_list_add(&lprof->lp_list, &lustre_profile_list);
 717         RETURN(err);
 718
 719 out:
 720         if (lprof->lp_md)
 721                 OBD_FREE(lprof->lp_md, mdclen);
 722         if (lprof->lp_dt)
 723                 OBD_FREE(lprof->lp_dt, osclen);
 724         if (lprof->lp_profile)
 725                 OBD_FREE(lprof->lp_profile, proflen);
 726         OBD_FREE(lprof, sizeof(*lprof));
 727         RETURN(err);
 728 }
 729
 730 void class_del_profile(const char *prof)
 731 {
 732         struct lustre_profile *lprof;
 733         ENTRY;
 734
 735         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
 736
 737         lprof = class_get_profile(prof);
 738         if (lprof) {
 739                 cfs_list_del(&lprof->lp_list);
 740                 OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
 741                 OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
 742                 if (lprof->lp_md)
 743                         OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
 744                 OBD_FREE(lprof, sizeof *lprof);
 745         }
 746         EXIT;
 747 }
 748
 749 /* COMPAT_146 */
 750 void class_del_profiles(void)
 751 {
 752         struct lustre_profile *lprof, *n;
 753         ENTRY;
 754
 755         cfs_list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
 756                 cfs_list_del(&lprof->lp_list);
 757                 OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
 758                 OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
 759                 if (lprof->lp_md)
 760                         OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
 761                 OBD_FREE(lprof, sizeof *lprof);
 762         }
 763         EXIT;
 764 }
 765
 766 static int class_set_global(char *ptr, int val) {
 767         ENTRY;
 768
 769         if (class_match_param(ptr, PARAM_AT_MIN, NULL) == 0)
 770             at_min = val;
 771         else if (class_match_param(ptr, PARAM_AT_MAX, NULL) == 0)
 772                 at_max = val;
 773         else if (class_match_param(ptr, PARAM_AT_EXTRA, NULL) == 0)
 774                 at_extra = val;
 775         else if (class_match_param(ptr, PARAM_AT_EARLY_MARGIN, NULL) == 0)
 776                 at_early_margin = val;
 777         else if (class_match_param(ptr, PARAM_AT_HISTORY, NULL) == 0)
 778                 at_history = val;
 779         else
 780                 RETURN(-EINVAL);
 781
 782         CDEBUG(D_IOCTL, "global %s = %d\n", ptr, val);
 783
 784         RETURN(0);
 785 }
 786
 787
 788 /* We can't call ll_process_config directly because it lives in a module that
 789    must be loaded after this one. */
 790 static int (*client_process_config)(struct lustre_cfg *lcfg) = NULL;
 791
 792 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg))
 793 {
 794         client_process_config = cpc;
 795 }
 796 EXPORT_SYMBOL(lustre_register_client_process_config);
 797
 798 int class_process_config(struct lustre_cfg *lcfg)
 799 {
 800         struct obd_device *obd;
 801         int err;
 802
 803         LASSERT(lcfg && !IS_ERR(lcfg));
 804         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
 805
 806         /* Commands that don't need a device */
 807         switch(lcfg->lcfg_command) {
 808         case LCFG_ATTACH: {
 809                 err = class_attach(lcfg);
 810                 GOTO(out, err);
 811         }
 812         case LCFG_ADD_UUID: {
 813                 CDEBUG(D_IOCTL, "adding mapping from uuid %s to nid "LPX64
 814                        " (%s)\n", lustre_cfg_string(lcfg, 1),
 815                        lcfg->lcfg_nid, libcfs_nid2str(lcfg->lcfg_nid));
 816
 817                 err = class_add_uuid(lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid);
 818                 GOTO(out, err);
 819         }
 820         case LCFG_DEL_UUID: {
 821                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
 822                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) == 0)
 823                        ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
 824
 825                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
 826                 GOTO(out, err);
 827         }
 828         case LCFG_MOUNTOPT: {
 829                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
 830                        lustre_cfg_string(lcfg, 1),
 831                        lustre_cfg_string(lcfg, 2),
 832                        lustre_cfg_string(lcfg, 3));
 833                 /* set these mount options somewhere, so ll_fill_super
 834                  * can find them. */
 835                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
 836                                         lustre_cfg_string(lcfg, 1),
 837                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
 838                                         lustre_cfg_string(lcfg, 2),
 839                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
 840                                         lustre_cfg_string(lcfg, 3));
 841                 GOTO(out, err);
 842         }
 843         case LCFG_DEL_MOUNTOPT: {
 844                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
 845                        lustre_cfg_string(lcfg, 1));
 846                 class_del_profile(lustre_cfg_string(lcfg, 1));
 847                 GOTO(out, err = 0);
 848         }
 849         case LCFG_SET_TIMEOUT: {
 850                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
 851                        obd_timeout, lcfg->lcfg_num);
 852                 obd_timeout = max(lcfg->lcfg_num, 1U);
 853                 GOTO(out, err = 0);
 854         }
 855         case LCFG_SET_LDLM_TIMEOUT: {
 856                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
 857                        ldlm_timeout, lcfg->lcfg_num);
 858                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
 859                 if (ldlm_timeout >= obd_timeout)
 860                         ldlm_timeout = max(obd_timeout / 3, 1U);
 861
 862                 GOTO(out, err = 0);
 863         }
 864         case LCFG_SET_UPCALL: {
 865                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
 866                 /* COMPAT_146 Don't fail on old configs */
 867                 GOTO(out, err = 0);
 868         }
 869         case LCFG_MARKER: {
 870                 struct cfg_marker *marker;
 871                 marker = lustre_cfg_buf(lcfg, 1);
 872                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
 873                        marker->cm_flags, marker->cm_tgtname, marker->cm_comment);
 874                 GOTO(out, err = 0);
 875         }
 876         case LCFG_PARAM: {
 877                 char *tmp;
 878                 /* llite has no obd */
 879                 if ((class_match_param(lustre_cfg_string(lcfg, 1),
 880                                        PARAM_LLITE, 0) == 0) &&
 881                     client_process_config) {
 882                         err = (*client_process_config)(lcfg);
 883                         GOTO(out, err);
 884                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
 885                                               PARAM_SYS, &tmp) == 0)) {
 886                         /* Global param settings */
 887                         err = class_set_global(tmp, lcfg->lcfg_num);
 888                         /* Note that since LCFG_PARAM is LCFG_REQUIRED, new
 889                            unknown globals would cause config to fail */
 890                         if (err)
 891                                 CWARN("Ignoring unknown param %s\n", tmp);
 892                         GOTO(out, 0);
 893                 }
 894
 895                 /* Fall through */
 896                 break;
 897         }
 898         }
 899
 900         /* Commands that require a device */
 901         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
 902         if (obd == NULL) {
 903                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
 904                         CERROR("this lcfg command requires a device name\n");
 905                 else
 906                         CERROR("no device for: %s\n",
 907                                lustre_cfg_string(lcfg, 0));
 908
 909                 GOTO(out, err = -EINVAL);
 910         }
 911
 912         switch(lcfg->lcfg_command) {
 913         case LCFG_SETUP: {
 914                 err = class_setup(obd, lcfg);
 915                 GOTO(out, err);
 916         }
 917         case LCFG_DETACH: {
 918                 err = class_detach(obd, lcfg);
 919                 GOTO(out, err = 0);
 920         }
 921         case LCFG_CLEANUP: {
 922                 err = class_cleanup(obd, lcfg);
 923                 GOTO(out, err = 0);
 924         }
 925         case LCFG_ADD_CONN: {
 926                 err = class_add_conn(obd, lcfg);
 927                 GOTO(out, err = 0);
 928         }
 929         case LCFG_DEL_CONN: {
 930                 err = class_del_conn(obd, lcfg);
 931                 GOTO(out, err = 0);
 932         }
 933         case LCFG_POOL_NEW: {
 934                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
 935                 GOTO(out, err = 0);
 936                 break;
 937         }
 938         case LCFG_POOL_ADD: {
 939                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
 940                                    lustre_cfg_string(lcfg, 3));
 941                 GOTO(out, err = 0);
 942                 break;
 943         }
 944         case LCFG_POOL_REM: {
 945                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
 946                                    lustre_cfg_string(lcfg, 3));
 947                 GOTO(out, err = 0);
 948                 break;
 949         }
 950         case LCFG_POOL_DEL: {
 951                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
 952                 GOTO(out, err = 0);
 953                 break;
 954         }
 955         default: {
 956                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
 957                 GOTO(out, err);
 958
 959         }
 960         }
 961 out:
 962         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
 963                 CWARN("Ignoring error %d on optional command %#x\n", err,
 964                       lcfg->lcfg_command);
 965                 err = 0;
 966         }
 967         return err;
 968 }
 969
 970 int class_process_proc_param(char *prefix, struct lprocfs_vars *lvars,
 971                              struct lustre_cfg *lcfg, void *data)
 972 {
 973 #ifdef __KERNEL__
 974         struct lprocfs_vars *var;
 975         char *key, *sval;
 976         int i, keylen, vallen;
 977         int matched = 0, j = 0;
 978         int rc = 0;
 979         int skip = 0;
 980         ENTRY;
 981
 982         if (lcfg->lcfg_command != LCFG_PARAM) {
 983                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
 984                 RETURN(-EINVAL);
 985         }
 986
 987         /* e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
 988            or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
 989            or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36 */
 990         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
 991                 key = lustre_cfg_buf(lcfg, i);
 992                 /* Strip off prefix */
 993                 class_match_param(key, prefix, &key);
 994                 sval = strchr(key, '=');
 995                 if (!sval || (*(sval + 1) == 0)) {
 996                         CERROR("Can't parse param %s (missing '=')\n", key);
 997                         /* rc = -EINVAL;        continue parsing other params */
 998                         continue;
 999                 }
1000                 keylen = sval - key;
1001                 sval++;
1002                 vallen = strlen(sval);
1003                 matched = 0;
1004                 j = 0;
1005                 /* Search proc entries */
1006                 while (lvars[j].name) {
1007                         var = &lvars[j];
1008                         if (class_match_param(key, (char *)var->name, 0) == 0 &&
1009                             keylen == strlen(var->name)) {
1010                                 matched++;
1011                                 rc = -EROFS;
1012                                 if (var->write_fptr) {
1013                                         mm_segment_t oldfs;
1014                                         oldfs = get_fs();
1015                                         set_fs(KERNEL_DS);
1016                                         rc = (var->write_fptr)(NULL, sval,
1017                                                                vallen, data);
1018                                         set_fs(oldfs);
1019                                 }
1020                                 break;
1021                         }
1022                         j++;
1023                 }
1024                 if (!matched) {
1025                         /* If the prefix doesn't match, return error so we
1026                            can pass it down the stack */
1027                         if (strnchr(key, keylen, '.'))
1028                             RETURN(-ENOSYS);
1029                         CERROR("%s: unknown param %s\n",
1030                                (char *)lustre_cfg_string(lcfg, 0), key);
1031                         /* rc = -EINVAL;        continue parsing other params */
1032                         skip++;
1033                 } else if (rc < 0) {
1034                         CERROR("writing proc entry %s err %d\n",
1035                                var->name, rc);
1036                         rc = 0;
1037                 } else {
1038                         LCONSOLE_INFO("%s.%.*s: set parameter %.*s=%s\n",
1039                                       lustre_cfg_string(lcfg, 0),
1040                                       (int)strlen(prefix) - 1, prefix,
1041                                       (int)(sval - key - 1), key, sval);
1042                 }
1043         }
1044
1045         if (rc > 0)
1046                 rc = 0;
1047         if (!rc && skip)
1048                 rc = skip;
1049         RETURN(rc);
1050 #else
1051         CDEBUG(D_CONFIG, "liblustre can't process params.\n");
1052         /* Don't throw config error */
1053         RETURN(0);
1054 #endif
1055 }
1056
1057 int class_config_dump_handler(struct llog_handle * handle,
1058                               struct llog_rec_hdr *rec, void *data);
1059
1060 #ifdef __KERNEL__
1061 extern int lustre_check_exclusion(struct super_block *sb, char *svname);
1062 #else
1063 #define lustre_check_exclusion(a,b)  0
1064 #endif
1065
1066 static int class_config_llog_handler(struct llog_handle * handle,
1067                                      struct llog_rec_hdr *rec, void *data)
1068 {
1069         struct config_llog_instance *clli = data;
1070         int cfg_len = rec->lrh_len;
1071         char *cfg_buf = (char*) (rec + 1);
1072         int rc = 0;
1073         ENTRY;
1074
1075         //class_config_dump_handler(handle, rec, data);
1076
1077         switch (rec->lrh_type) {
1078         case OBD_CFG_REC: {
1079                 struct lustre_cfg *lcfg, *lcfg_new;
1080                 struct lustre_cfg_bufs bufs;
1081                 char *inst_name = NULL;
1082                 int inst_len = 0;
1083                 int inst = 0, swab = 0;
1084
1085                 lcfg = (struct lustre_cfg *)cfg_buf;
1086                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1087                         lustre_swab_lustre_cfg(lcfg);
1088                         swab = 1;
1089                 }
1090
1091                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1092                 if (rc)
1093                         GOTO(out, rc);
1094
1095                 /* Figure out config state info */
1096                 if (lcfg->lcfg_command == LCFG_MARKER) {
1097                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1098                         lustre_swab_cfg_marker(marker, swab,
1099                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1100                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1101                                clli->cfg_flags, marker->cm_flags);
1102                         if (marker->cm_flags & CM_START) {
1103                                 /* all previous flags off */
1104                                 clli->cfg_flags = CFG_F_MARKER;
1105                                 if (marker->cm_flags & CM_SKIP) {
1106                                         clli->cfg_flags |= CFG_F_SKIP;
1107                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1108                                                marker->cm_step);
1109                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1110                                            (clli->cfg_sb &&
1111                                             lustre_check_exclusion(clli->cfg_sb,
1112                                                          marker->cm_tgtname))) {
1113                                         clli->cfg_flags |= CFG_F_EXCLUDE;
1114                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1115                                                marker->cm_step);
1116                                 }
1117                         } else if (marker->cm_flags & CM_END) {
1118                                 clli->cfg_flags = 0;
1119                         }
1120                 }
1121                 /* A config command without a start marker before it is
1122                    illegal (post 146) */
1123                 if (!(clli->cfg_flags & CFG_F_COMPAT146) &&
1124                     !(clli->cfg_flags & CFG_F_MARKER) &&
1125                     (lcfg->lcfg_command != LCFG_MARKER)) {
1126                         CWARN("Config not inside markers, ignoring! "
1127                               "(inst: %s, uuid: %s, flags: %#x)\n",
1128                               clli->cfg_instance ? clli->cfg_instance : "<null>",
1129                               clli->cfg_uuid.uuid, clli->cfg_flags);
1130                         clli->cfg_flags |= CFG_F_SKIP;
1131                 }
1132                 if (clli->cfg_flags & CFG_F_SKIP) {
1133                         CDEBUG(D_CONFIG, "skipping %#x\n",
1134                                clli->cfg_flags);
1135                         rc = 0;
1136                         /* No processing! */
1137                         break;
1138                 }
1139
1140                 /*
1141                  * For interoperability between 1.8 and 2.0,
1142                  * rename "mds" obd device type to "mdt".
1143                  */
1144                 {
1145                         char *typename = lustre_cfg_string(lcfg, 1);
1146                         char *index = lustre_cfg_string(lcfg, 2);
1147
1148                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1149                              strcmp(typename, "mds") == 0)) {
1150                                 CWARN("For 1.8 interoperability, rename obd "
1151                                        "type from mds to mdt\n");
1152                                 typename[2] = 't';
1153                         }
1154                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1155                              strcmp(index, "type") == 0)) {
1156                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1157                                        "set this index to '0'\n");
1158                                 index[0] = '0';
1159                                 index[1] = 0;
1160                         }
1161                 }
1162
1163                 if ((clli->cfg_flags & CFG_F_EXCLUDE) &&
1164                     (lcfg->lcfg_command == LCFG_LOV_ADD_OBD))
1165                         /* Add inactive instead */
1166                         lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1167
1168                 lustre_cfg_bufs_init(&bufs, lcfg);
1169
1170                 if (clli && clli->cfg_instance &&
1171                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0){
1172                         inst = 1;
1173                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1174                                 strlen(clli->cfg_instance) + 1;
1175                         OBD_ALLOC(inst_name, inst_len);
1176                         if (inst_name == NULL)
1177                                 GOTO(out, rc = -ENOMEM);
1178                         sprintf(inst_name, "%s-%s",
1179                                 lustre_cfg_string(lcfg, 0),
1180                                 clli->cfg_instance);
1181                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1182                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1183                                lcfg->lcfg_command, inst_name);
1184                 }
1185
1186                 /* we override the llog's uuid for clients, to insure they
1187                 are unique */
1188                 if (clli && clli->cfg_instance &&
1189                     lcfg->lcfg_command == LCFG_ATTACH) {
1190                         lustre_cfg_bufs_set_string(&bufs, 2,
1191                                                    clli->cfg_uuid.uuid);
1192                 }
1193                 /*
1194                  * sptlrpc config record, we expect 2 data segments:
1195                  *  [0]: fs_name/target_name,
1196                  *  [1]: rule string
1197                  * moving them to index [1] and [2], and insert MGC's
1198                  * obdname at index [0].
1199                  */
1200                 if (clli && clli->cfg_instance == NULL &&
1201                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1202                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1203                                             bufs.lcfg_buflen[1]);
1204                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1205                                             bufs.lcfg_buflen[0]);
1206                         lustre_cfg_bufs_set_string(&bufs, 0,
1207                                                    clli->cfg_obdname);
1208                 }
1209
1210                 lcfg_new = lustre_cfg_new(lcfg->lcfg_command, &bufs);
1211
1212                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1213                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1214
1215                 /* XXX Hack to try to remain binary compatible with
1216                  * pre-newconfig logs */
1217                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1218                     (lcfg->lcfg_nid >> 32) == 0) {
1219                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1220
1221                         lcfg_new->lcfg_nid =
1222                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1223                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
1224                               lcfg->lcfg_nal, addr,
1225                               libcfs_nid2str(lcfg_new->lcfg_nid));
1226                 } else {
1227                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
1228                 }
1229
1230                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
1231
1232                 rc = class_process_config(lcfg_new);
1233                 lustre_cfg_free(lcfg_new);
1234
1235                 if (inst)
1236                         OBD_FREE(inst_name, inst_len);
1237                 break;
1238         }
1239         default:
1240                 CERROR("Unknown llog record type %#x encountered\n",
1241                        rec->lrh_type);
1242                 break;
1243         }
1244 out:
1245         if (rc) {
1246                 CERROR("Err %d on cfg command:\n", rc);
1247                 class_config_dump_handler(handle, rec, data);
1248         }
1249         RETURN(rc);
1250 }
1251
1252 int class_config_parse_llog(struct llog_ctxt *ctxt, char *name,
1253                             struct config_llog_instance *cfg)
1254 {
1255         struct llog_process_cat_data cd = {0, 0};
1256         struct llog_handle *llh;
1257         int rc, rc2;
1258         ENTRY;
1259
1260         CDEBUG(D_INFO, "looking up llog %s\n", name);
1261         rc = llog_create(ctxt, &llh, NULL, name);
1262         if (rc)
1263                 RETURN(rc);
1264
1265         rc = llog_init_handle(llh, LLOG_F_IS_PLAIN, NULL);
1266         if (rc)
1267                 GOTO(parse_out, rc);
1268
1269         /* continue processing from where we last stopped to end-of-log */
1270         if (cfg)
1271                 cd.lpcd_first_idx = cfg->cfg_last_idx;
1272         cd.lpcd_last_idx = 0;
1273
1274         rc = llog_process(llh, class_config_llog_handler, cfg, &cd);
1275
1276         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
1277                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
1278
1279         if (cfg)
1280                 cfg->cfg_last_idx = cd.lpcd_last_idx;
1281
1282 parse_out:
1283         rc2 = llog_close(llh);
1284         if (rc == 0)
1285                 rc = rc2;
1286
1287         RETURN(rc);
1288 }
1289
1290 int class_config_dump_handler(struct llog_handle * handle,
1291                               struct llog_rec_hdr *rec, void *data)
1292 {
1293         int cfg_len = rec->lrh_len;
1294         char *cfg_buf = (char*) (rec + 1);
1295         char *outstr, *ptr, *end;
1296         int rc = 0;
1297         ENTRY;
1298
1299         OBD_ALLOC(outstr, 256);
1300         end = outstr + 256;
1301         ptr = outstr;
1302         if (!outstr) {
1303                 RETURN(-ENOMEM);
1304         }
1305         if (rec->lrh_type == OBD_CFG_REC) {
1306                 struct lustre_cfg *lcfg;
1307                 int i;
1308
1309                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1310                 if (rc)
1311                         GOTO(out, rc);
1312                 lcfg = (struct lustre_cfg *)cfg_buf;
1313
1314                 ptr += snprintf(ptr, end-ptr, "cmd=%05x ",
1315                                 lcfg->lcfg_command);
1316                 if (lcfg->lcfg_flags) {
1317                         ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
1318                                         lcfg->lcfg_flags);
1319                 }
1320                 if (lcfg->lcfg_num) {
1321                         ptr += snprintf(ptr, end-ptr, "num=%#08x ",
1322                                         lcfg->lcfg_num);
1323                 }
1324                 if (lcfg->lcfg_nid) {
1325                         ptr += snprintf(ptr, end-ptr, "nid=%s("LPX64")\n     ",
1326                                         libcfs_nid2str(lcfg->lcfg_nid),
1327                                         lcfg->lcfg_nid);
1328                 }
1329                 if (lcfg->lcfg_command == LCFG_MARKER) {
1330                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1331                         ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
1332                                         marker->cm_step, marker->cm_flags,
1333                                         marker->cm_tgtname, marker->cm_comment);
1334                 } else {
1335                         for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
1336                                 ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
1337                                                 lustre_cfg_string(lcfg, i));
1338                         }
1339                 }
1340                 LCONSOLE(D_WARNING, "   %s\n", outstr);
1341         } else {
1342                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
1343                 rc = -EINVAL;
1344         }
1345 out:
1346         OBD_FREE(outstr, 256);
1347         RETURN(rc);
1348 }
1349
1350 int class_config_dump_llog(struct llog_ctxt *ctxt, char *name,
1351                            struct config_llog_instance *cfg)
1352 {
1353         struct llog_handle *llh;
1354         int rc, rc2;
1355         ENTRY;
1356
1357         LCONSOLE_INFO("Dumping config log %s\n", name);
1358
1359         rc = llog_create(ctxt, &llh, NULL, name);
1360         if (rc)
1361                 RETURN(rc);
1362
1363         rc = llog_init_handle(llh, LLOG_F_IS_PLAIN, NULL);
1364         if (rc)
1365                 GOTO(parse_out, rc);
1366
1367         rc = llog_process(llh, class_config_dump_handler, cfg, NULL);
1368 parse_out:
1369         rc2 = llog_close(llh);
1370         if (rc == 0)
1371                 rc = rc2;
1372
1373         LCONSOLE_INFO("End config log %s\n", name);
1374         RETURN(rc);
1375
1376 }
1377
1378 /* Cleanup and detach */
1379 int class_manual_cleanup(struct obd_device *obd)
1380 {
1381         char                    flags[3] = "";
1382         struct lustre_cfg      *lcfg;
1383         struct lustre_cfg_bufs  bufs;
1384         int                     rc;
1385         ENTRY;
1386
1387         if (!obd) {
1388                 CERROR("empty cleanup\n");
1389                 RETURN(-EALREADY);
1390         }
1391
1392         if (obd->obd_force)
1393                 strcat(flags, "F");
1394         if (obd->obd_fail)
1395                 strcat(flags, "A");
1396
1397         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
1398                obd->obd_name, flags);
1399
1400         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
1401         lustre_cfg_bufs_set_string(&bufs, 1, flags);
1402         lcfg = lustre_cfg_new(LCFG_CLEANUP, &bufs);
1403         if (!lcfg)
1404                 RETURN(-ENOMEM);
1405
1406         rc = class_process_config(lcfg);
1407         if (rc) {
1408                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
1409                 GOTO(out, rc);
1410         }
1411
1412         /* the lcfg is almost the same for both ops */
1413         lcfg->lcfg_command = LCFG_DETACH;
1414         rc = class_process_config(lcfg);
1415         if (rc)
1416                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
1417 out:
1418         lustre_cfg_free(lcfg);
1419         RETURN(rc);
1420 }
1421
1422 /*
1423  * uuid<->export lustre hash operations
1424  */
1425
1426 static unsigned
1427 uuid_hash(cfs_hash_t *hs,  void *key, unsigned mask)
1428 {
1429         return cfs_hash_djb2_hash(((struct obd_uuid *)key)->uuid,
1430                                   sizeof(((struct obd_uuid *)key)->uuid), mask);
1431 }
1432
1433 static void *
1434 uuid_key(cfs_hlist_node_t *hnode)
1435 {
1436         struct obd_export *exp;
1437
1438         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1439
1440         RETURN(&exp->exp_client_uuid);
1441 }
1442
1443 /*
1444  * NOTE: It is impossible to find an export that is in failed
1445  *       state with this function
1446  */
1447 static int
1448 uuid_compare(void *key, cfs_hlist_node_t *hnode)
1449 {
1450         struct obd_export *exp;
1451
1452         LASSERT(key);
1453         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1454
1455         RETURN(obd_uuid_equals((struct obd_uuid *)key,&exp->exp_client_uuid) &&
1456                !exp->exp_failed);
1457 }
1458
1459 static void *
1460 uuid_export_get(cfs_hlist_node_t *hnode)
1461 {
1462         struct obd_export *exp;
1463
1464         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1465         class_export_get(exp);
1466
1467         RETURN(exp);
1468 }
1469
1470 static void *
1471 uuid_export_put(cfs_hlist_node_t *hnode)
1472 {
1473         struct obd_export *exp;
1474
1475         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1476         class_export_put(exp);
1477
1478         RETURN(exp);
1479 }
1480
1481 static cfs_hash_ops_t uuid_hash_ops = {
1482         .hs_hash    = uuid_hash,
1483         .hs_key     = uuid_key,
1484         .hs_compare = uuid_compare,
1485         .hs_get     = uuid_export_get,
1486         .hs_put     = uuid_export_put,
1487 };
1488
1489
1490 /*
1491  * nid<->export hash operations
1492  */
1493
1494 static unsigned
1495 nid_hash(cfs_hash_t *hs,  void *key, unsigned mask)
1496 {
1497         return cfs_hash_djb2_hash(key, sizeof(lnet_nid_t), mask);
1498 }
1499
1500 static void *
1501 nid_key(cfs_hlist_node_t *hnode)
1502 {
1503         struct obd_export *exp;
1504
1505         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1506
1507         RETURN(&exp->exp_connection->c_peer.nid);
1508 }
1509
1510 /*
1511  * NOTE: It is impossible to find an export that is in failed
1512  *       state with this function
1513  */
1514 static int
1515 nid_compare(void *key, cfs_hlist_node_t *hnode)
1516 {
1517         struct obd_export *exp;
1518
1519         LASSERT(key);
1520         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1521
1522         RETURN(exp->exp_connection->c_peer.nid == *(lnet_nid_t *)key &&
1523                !exp->exp_failed);
1524 }
1525
1526 static void *
1527 nid_export_get(cfs_hlist_node_t *hnode)
1528 {
1529         struct obd_export *exp;
1530
1531         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1532         class_export_get(exp);
1533
1534         RETURN(exp);
1535 }
1536
1537 static void *
1538 nid_export_put(cfs_hlist_node_t *hnode)
1539 {
1540         struct obd_export *exp;
1541
1542         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1543         class_export_put(exp);
1544
1545         RETURN(exp);
1546 }
1547
1548 static cfs_hash_ops_t nid_hash_ops = {
1549         .hs_hash    = nid_hash,
1550         .hs_key     = nid_key,
1551         .hs_compare = nid_compare,
1552         .hs_get     = nid_export_get,
1553         .hs_put     = nid_export_put,
1554 };
1555
1556
1557 /*
1558  * nid<->nidstats hash operations
1559  */
1560
1561 static void *
1562 nidstats_key(cfs_hlist_node_t *hnode)
1563 {
1564         struct nid_stat *ns;
1565
1566         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1567
1568         RETURN(&ns->nid);
1569 }
1570
1571 static int
1572 nidstats_compare(void *key, cfs_hlist_node_t *hnode)
1573 {
1574         RETURN(*(lnet_nid_t *)nidstats_key(hnode) == *(lnet_nid_t *)key);
1575 }
1576
1577 static void *
1578 nidstats_get(cfs_hlist_node_t *hnode)
1579 {
1580         struct nid_stat *ns;
1581
1582         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1583         nidstat_getref(ns);
1584
1585         RETURN(ns);
1586 }
1587
1588 static void *
1589 nidstats_put(cfs_hlist_node_t *hnode)
1590 {
1591         struct nid_stat *ns;
1592
1593         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1594         nidstat_putref(ns);
1595
1596         RETURN(ns);
1597 }
1598
1599 static cfs_hash_ops_t nid_stat_hash_ops = {
1600         .hs_hash    = nid_hash,
1601         .hs_key     = nidstats_key,
1602         .hs_compare = nidstats_compare,
1603         .hs_get     = nidstats_get,
1604         .hs_put     = nidstats_put,
1605 };