lustre/obdclass/obd_config.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, Whamcloud, Inc.
  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 static int parse_nid(char *buf, void *value)
 161 {
 162         lnet_nid_t *nid = (lnet_nid_t *)value;
 163
 164         *nid = libcfs_str2nid(buf);
 165         if (*nid != LNET_NID_ANY)
 166                 return 0;
 167
 168         LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
 169         return -EINVAL;
 170 }
 171
 172 static int parse_net(char *buf, void *value)
 173 {
 174         __u32 *net = (__u32 *)value;
 175
 176         *net = libcfs_str2net(buf);
 177         CDEBUG(D_INFO, "Net %s\n", libcfs_net2str(*net));
 178         return 0;
 179 }
 180
 181 enum {
 182         CLASS_PARSE_NID = 1,
 183         CLASS_PARSE_NET,
 184 };
 185
 186 /* 0 is good nid,
 187    1 not found
 188    < 0 error
 189    endh is set to next separator */
 190 static int class_parse_value(char *buf, int opc, void *value, char **endh)
 191 {
 192         char *endp;
 193         char  tmp;
 194         int   rc = 0;
 195
 196         if (!buf)
 197                 return 1;
 198         while (*buf == ',' || *buf == ':')
 199                 buf++;
 200         if (*buf == ' ' || *buf == '/' || *buf == '\0')
 201                 return 1;
 202
 203         /* nid separators or end of nids */
 204         endp = strpbrk(buf, ",: /");
 205         if (endp == NULL)
 206                 endp = buf + strlen(buf);
 207
 208         tmp = *endp;
 209         *endp = '\0';
 210         switch (opc) {
 211         default:
 212                 LBUG();
 213         case CLASS_PARSE_NID:
 214                 rc = parse_nid(buf, value);
 215                 break;
 216         case CLASS_PARSE_NET:
 217                 rc = parse_net(buf, value);
 218                 break;
 219         }
 220         *endp = tmp;
 221         if (rc != 0)
 222                 return rc;
 223         if (endh)
 224                 *endh = endp;
 225         return 0;
 226 }
 227
 228 int class_parse_nid(char *buf, lnet_nid_t *nid, char **endh)
 229 {
 230         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh);
 231 }
 232
 233 int class_parse_net(char *buf, __u32 *net, char **endh)
 234 {
 235         return class_parse_value(buf, CLASS_PARSE_NET, (void *)net, endh);
 236 }
 237
 238 /* 1 param contains key and match
 239  * 0 param contains key and not match
 240  * -1 param does not contain key
 241  */
 242 int class_match_nid(char *buf, char *key, lnet_nid_t nid)
 243 {
 244         lnet_nid_t tmp;
 245         int   rc = -1;
 246
 247         while (class_find_param(buf, key, &buf) == 0) {
 248                 /* please restrict to the nids pertaining to
 249                  * the specified nids */
 250                 while (class_parse_nid(buf, &tmp, &buf) == 0) {
 251                         if (tmp == nid)
 252                                 return 1;
 253                 }
 254                 rc = 0;
 255         }
 256         return rc;
 257 }
 258
 259 int class_match_net(char *buf, char *key, __u32 net)
 260 {
 261         __u32 tmp;
 262         int   rc = -1;
 263
 264         while (class_find_param(buf, key, &buf) == 0) {
 265                 /* please restrict to the nids pertaining to
 266                  * the specified networks */
 267                 while (class_parse_net(buf, &tmp, &buf) == 0) {
 268                         if (tmp == net)
 269                                 return 1;
 270                 }
 271                 rc = 0;
 272         }
 273         return rc;
 274 }
 275
 276 EXPORT_SYMBOL(class_find_param);
 277 EXPORT_SYMBOL(class_get_next_param);
 278 EXPORT_SYMBOL(class_match_param);
 279 EXPORT_SYMBOL(class_parse_nid);
 280 EXPORT_SYMBOL(class_parse_net);
 281 EXPORT_SYMBOL(class_match_nid);
 282 EXPORT_SYMBOL(class_match_net);
 283
 284 /********************** class fns **********************/
 285
 286 /**
 287  * Create a new obd device and set the type, name and uuid.  If successful,
 288  * the new device can be accessed by either name or uuid.
 289  */
 290 int class_attach(struct lustre_cfg *lcfg)
 291 {
 292         struct obd_device *obd = NULL;
 293         char *typename, *name, *uuid;
 294         int rc, len;
 295         ENTRY;
 296
 297         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 298                 CERROR("No type passed!\n");
 299                 RETURN(-EINVAL);
 300         }
 301         typename = lustre_cfg_string(lcfg, 1);
 302
 303         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 304                 CERROR("No name passed!\n");
 305                 RETURN(-EINVAL);
 306         }
 307         name = lustre_cfg_string(lcfg, 0);
 308
 309         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 310                 CERROR("No UUID passed!\n");
 311                 RETURN(-EINVAL);
 312         }
 313         uuid = lustre_cfg_string(lcfg, 2);
 314
 315         CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 316                MKSTR(typename), MKSTR(name), MKSTR(uuid));
 317
 318         obd = class_newdev(typename, name);
 319         if (IS_ERR(obd)) {
 320                 /* Already exists or out of obds */
 321                 rc = PTR_ERR(obd);
 322                 obd = NULL;
 323                 CERROR("Cannot create device %s of type %s : %d\n",
 324                        name, typename, rc);
 325                 GOTO(out, rc);
 326         }
 327         LASSERTF(obd != NULL, "Cannot get obd device %s of type %s\n",
 328                  name, typename);
 329         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 330                  "obd %p obd_magic %08X != %08X\n",
 331                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 332         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 333                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 334
 335         cfs_rwlock_init(&obd->obd_pool_lock);
 336         obd->obd_pool_limit = 0;
 337         obd->obd_pool_slv = 0;
 338
 339         CFS_INIT_LIST_HEAD(&obd->obd_exports);
 340         CFS_INIT_LIST_HEAD(&obd->obd_unlinked_exports);
 341         CFS_INIT_LIST_HEAD(&obd->obd_delayed_exports);
 342         CFS_INIT_LIST_HEAD(&obd->obd_exports_timed);
 343         CFS_INIT_LIST_HEAD(&obd->obd_nid_stats);
 344         cfs_spin_lock_init(&obd->obd_nid_lock);
 345         cfs_spin_lock_init(&obd->obd_dev_lock);
 346         cfs_mutex_init(&obd->obd_dev_mutex);
 347         cfs_spin_lock_init(&obd->obd_osfs_lock);
 348         /* obd->obd_osfs_age must be set to a value in the distant
 349          * past to guarantee a fresh statfs is fetched on mount. */
 350         obd->obd_osfs_age = cfs_time_shift_64(-1000);
 351
 352         /* XXX belongs in setup not attach  */
 353         cfs_init_rwsem(&obd->obd_observer_link_sem);
 354         /* recovery data */
 355         cfs_init_timer(&obd->obd_recovery_timer);
 356         cfs_spin_lock_init(&obd->obd_recovery_task_lock);
 357         cfs_waitq_init(&obd->obd_next_transno_waitq);
 358         cfs_waitq_init(&obd->obd_evict_inprogress_waitq);
 359         CFS_INIT_LIST_HEAD(&obd->obd_req_replay_queue);
 360         CFS_INIT_LIST_HEAD(&obd->obd_lock_replay_queue);
 361         CFS_INIT_LIST_HEAD(&obd->obd_final_req_queue);
 362         CFS_INIT_LIST_HEAD(&obd->obd_evict_list);
 363
 364         llog_group_init(&obd->obd_olg, FID_SEQ_LLOG);
 365
 366         obd->obd_conn_inprogress = 0;
 367
 368         len = strlen(uuid);
 369         if (len >= sizeof(obd->obd_uuid)) {
 370                 CERROR("uuid must be < %d bytes long\n",
 371                        (int)sizeof(obd->obd_uuid));
 372                 GOTO(out, rc = -EINVAL);
 373         }
 374         memcpy(obd->obd_uuid.uuid, uuid, len);
 375
 376         /* do the attach */
 377         if (OBP(obd, attach)) {
 378                 rc = OBP(obd,attach)(obd, sizeof *lcfg, lcfg);
 379                 if (rc)
 380                         GOTO(out, rc = -EINVAL);
 381         }
 382
 383         /* Detach drops this */
 384         cfs_spin_lock(&obd->obd_dev_lock);
 385         cfs_atomic_set(&obd->obd_refcount, 1);
 386         cfs_spin_unlock(&obd->obd_dev_lock);
 387         lu_ref_init(&obd->obd_reference);
 388         lu_ref_add(&obd->obd_reference, "attach", obd);
 389
 390         obd->obd_attached = 1;
 391         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 392                obd->obd_minor, typename, cfs_atomic_read(&obd->obd_refcount));
 393         RETURN(0);
 394  out:
 395         if (obd != NULL) {
 396                 class_release_dev(obd);
 397         }
 398         return rc;
 399 }
 400
 401 /** Create hashes, self-export, and call type-specific setup.
 402  * Setup is effectively the "start this obd" call.
 403  */
 404 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 405 {
 406         int err = 0;
 407         struct obd_export *exp;
 408         ENTRY;
 409
 410         LASSERT(obd != NULL);
 411         LASSERTF(obd == class_num2obd(obd->obd_minor),
 412                  "obd %p != obd_devs[%d] %p\n",
 413                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 414         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 415                  "obd %p obd_magic %08x != %08x\n",
 416                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 417
 418         /* have we attached a type to this device? */
 419         if (!obd->obd_attached) {
 420                 CERROR("Device %d not attached\n", obd->obd_minor);
 421                 RETURN(-ENODEV);
 422         }
 423
 424         if (obd->obd_set_up) {
 425                 CERROR("Device %d already setup (type %s)\n",
 426                        obd->obd_minor, obd->obd_type->typ_name);
 427                 RETURN(-EEXIST);
 428         }
 429
 430         /* is someone else setting us up right now? (attach inits spinlock) */
 431         cfs_spin_lock(&obd->obd_dev_lock);
 432         if (obd->obd_starting) {
 433                 cfs_spin_unlock(&obd->obd_dev_lock);
 434                 CERROR("Device %d setup in progress (type %s)\n",
 435                        obd->obd_minor, obd->obd_type->typ_name);
 436                 RETURN(-EEXIST);
 437         }
 438         /* just leave this on forever.  I can't use obd_set_up here because
 439            other fns check that status, and we're not actually set up yet. */
 440         obd->obd_starting = 1;
 441         obd->obd_uuid_hash = NULL;
 442         obd->obd_nid_hash = NULL;
 443         obd->obd_nid_stats_hash = NULL;
 444         cfs_spin_unlock(&obd->obd_dev_lock);
 445
 446         /* create an uuid-export lustre hash */
 447         obd->obd_uuid_hash = cfs_hash_create("UUID_HASH",
 448                                              HASH_UUID_CUR_BITS,
 449                                              HASH_UUID_MAX_BITS,
 450                                              HASH_UUID_BKT_BITS, 0,
 451                                              CFS_HASH_MIN_THETA,
 452                                              CFS_HASH_MAX_THETA,
 453                                              &uuid_hash_ops, CFS_HASH_DEFAULT);
 454         if (!obd->obd_uuid_hash)
 455                 GOTO(err_hash, err = -ENOMEM);
 456
 457         /* create a nid-export lustre hash */
 458         obd->obd_nid_hash = cfs_hash_create("NID_HASH",
 459                                             HASH_NID_CUR_BITS,
 460                                             HASH_NID_MAX_BITS,
 461                                             HASH_NID_BKT_BITS, 0,
 462                                             CFS_HASH_MIN_THETA,
 463                                             CFS_HASH_MAX_THETA,
 464                                             &nid_hash_ops, CFS_HASH_DEFAULT);
 465         if (!obd->obd_nid_hash)
 466                 GOTO(err_hash, err = -ENOMEM);
 467
 468         /* create a nid-stats lustre hash */
 469         obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
 470                                                   HASH_NID_STATS_CUR_BITS,
 471                                                   HASH_NID_STATS_MAX_BITS,
 472                                                   HASH_NID_STATS_BKT_BITS, 0,
 473                                                   CFS_HASH_MIN_THETA,
 474                                                   CFS_HASH_MAX_THETA,
 475                                                   &nid_stat_hash_ops, CFS_HASH_DEFAULT);
 476         if (!obd->obd_nid_stats_hash)
 477                 GOTO(err_hash, err = -ENOMEM);
 478
 479         exp = class_new_export(obd, &obd->obd_uuid);
 480         if (IS_ERR(exp))
 481                 GOTO(err_hash, err = PTR_ERR(exp));
 482
 483         obd->obd_self_export = exp;
 484         cfs_list_del_init(&exp->exp_obd_chain_timed);
 485         class_export_put(exp);
 486
 487         err = obd_setup(obd, lcfg);
 488         if (err)
 489                 GOTO(err_exp, err);
 490
 491         obd->obd_set_up = 1;
 492
 493         cfs_spin_lock(&obd->obd_dev_lock);
 494         /* cleanup drops this */
 495         class_incref(obd, "setup", obd);
 496         cfs_spin_unlock(&obd->obd_dev_lock);
 497
 498         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 499                obd->obd_name, obd->obd_uuid.uuid);
 500
 501         RETURN(0);
 502 err_exp:
 503         if (obd->obd_self_export) {
 504                 class_unlink_export(obd->obd_self_export);
 505                 obd->obd_self_export = NULL;
 506         }
 507 err_hash:
 508         if (obd->obd_uuid_hash) {
 509                 cfs_hash_putref(obd->obd_uuid_hash);
 510                 obd->obd_uuid_hash = NULL;
 511         }
 512         if (obd->obd_nid_hash) {
 513                 cfs_hash_putref(obd->obd_nid_hash);
 514                 obd->obd_nid_hash = NULL;
 515         }
 516         if (obd->obd_nid_stats_hash) {
 517                 cfs_hash_putref(obd->obd_nid_stats_hash);
 518                 obd->obd_nid_stats_hash = NULL;
 519         }
 520         obd->obd_starting = 0;
 521         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 522         return err;
 523 }
 524
 525 /** We have finished using this obd and are ready to destroy it.
 526  * There can be no more references to this obd.
 527  */
 528 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 529 {
 530         ENTRY;
 531
 532         if (obd->obd_set_up) {
 533                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 534                 RETURN(-EBUSY);
 535         }
 536
 537         cfs_spin_lock(&obd->obd_dev_lock);
 538         if (!obd->obd_attached) {
 539                 cfs_spin_unlock(&obd->obd_dev_lock);
 540                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 541                 RETURN(-ENODEV);
 542         }
 543         obd->obd_attached = 0;
 544         cfs_spin_unlock(&obd->obd_dev_lock);
 545
 546         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 547                obd->obd_name, obd->obd_uuid.uuid);
 548
 549         class_decref(obd, "attach", obd);
 550         RETURN(0);
 551 }
 552
 553 /** Start shutting down the obd.  There may be in-progess ops when
 554  * this is called.  We tell them to start shutting down with a call
 555  * to class_disconnect_exports().
 556  */
 557 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 558 {
 559         int err = 0;
 560         char *flag;
 561         ENTRY;
 562
 563         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 564
 565         if (!obd->obd_set_up) {
 566                 CERROR("Device %d not setup\n", obd->obd_minor);
 567                 RETURN(-ENODEV);
 568         }
 569
 570         cfs_spin_lock(&obd->obd_dev_lock);
 571         if (obd->obd_stopping) {
 572                 cfs_spin_unlock(&obd->obd_dev_lock);
 573                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 574                 RETURN(-ENODEV);
 575         }
 576         /* Leave this on forever */
 577         obd->obd_stopping = 1;
 578
 579         /* wait for already-arrived-connections to finish. */
 580         while (obd->obd_conn_inprogress > 0) {
 581                 cfs_spin_unlock(&obd->obd_dev_lock);
 582
 583                 cfs_cond_resched();
 584
 585                 cfs_spin_lock(&obd->obd_dev_lock);
 586         }
 587        cfs_spin_unlock(&obd->obd_dev_lock);
 588
 589         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 590                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 591                         switch (*flag) {
 592                         case 'F':
 593                                 obd->obd_force = 1;
 594                                 break;
 595                         case 'A':
 596                                 LCONSOLE_WARN("Failing over %s\n",
 597                                               obd->obd_name);
 598                                 obd->obd_fail = 1;
 599                                 obd->obd_no_transno = 1;
 600                                 obd->obd_no_recov = 1;
 601                                 if (OBP(obd, iocontrol)) {
 602                                         obd_iocontrol(OBD_IOC_SYNC,
 603                                                       obd->obd_self_export,
 604                                                       0, NULL, NULL);
 605                                 }
 606                                 break;
 607                         default:
 608                                 CERROR("Unrecognised flag '%c'\n", *flag);
 609                         }
 610         }
 611
 612         LASSERT(obd->obd_self_export);
 613
 614         /* The three references that should be remaining are the
 615          * obd_self_export and the attach and setup references. */
 616         if (cfs_atomic_read(&obd->obd_refcount) > 3) {
 617                 /* refcounf - 3 might be the number of real exports
 618                    (excluding self export). But class_incref is called
 619                    by other things as well, so don't count on it. */
 620                 CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d\n",
 621                        obd->obd_name, cfs_atomic_read(&obd->obd_refcount) - 3);
 622                 dump_exports(obd, 0);
 623                 class_disconnect_exports(obd);
 624         }
 625
 626         /* Precleanup, we must make sure all exports get destroyed. */
 627         err = obd_precleanup(obd, OBD_CLEANUP_EXPORTS);
 628         if (err)
 629                 CERROR("Precleanup %s returned %d\n",
 630                        obd->obd_name, err);
 631
 632         /* destroy an uuid-export hash body */
 633         if (obd->obd_uuid_hash) {
 634                 cfs_hash_putref(obd->obd_uuid_hash);
 635                 obd->obd_uuid_hash = NULL;
 636         }
 637
 638         /* destroy a nid-export hash body */
 639         if (obd->obd_nid_hash) {
 640                 cfs_hash_putref(obd->obd_nid_hash);
 641                 obd->obd_nid_hash = NULL;
 642         }
 643
 644         /* destroy a nid-stats hash body */
 645         if (obd->obd_nid_stats_hash) {
 646                 cfs_hash_putref(obd->obd_nid_stats_hash);
 647                 obd->obd_nid_stats_hash = NULL;
 648         }
 649
 650         class_decref(obd, "setup", obd);
 651         obd->obd_set_up = 0;
 652
 653         RETURN(0);
 654 }
 655
 656 struct obd_device *class_incref(struct obd_device *obd,
 657                                 const char *scope, const void *source)
 658 {
 659         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 660         cfs_atomic_inc(&obd->obd_refcount);
 661         CDEBUG(D_INFO, "incref %s (%p) now %d\n", obd->obd_name, obd,
 662                cfs_atomic_read(&obd->obd_refcount));
 663
 664         return obd;
 665 }
 666
 667 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 668 {
 669         int err;
 670         int refs;
 671
 672         cfs_spin_lock(&obd->obd_dev_lock);
 673         cfs_atomic_dec(&obd->obd_refcount);
 674         refs = cfs_atomic_read(&obd->obd_refcount);
 675         cfs_spin_unlock(&obd->obd_dev_lock);
 676         lu_ref_del(&obd->obd_reference, scope, source);
 677
 678         CDEBUG(D_INFO, "Decref %s (%p) now %d\n", obd->obd_name, obd, refs);
 679
 680         if ((refs == 1) && obd->obd_stopping) {
 681                 /* All exports have been destroyed; there should
 682                    be no more in-progress ops by this point.*/
 683
 684                 cfs_spin_lock(&obd->obd_self_export->exp_lock);
 685                 obd->obd_self_export->exp_flags |= exp_flags_from_obd(obd);
 686                 cfs_spin_unlock(&obd->obd_self_export->exp_lock);
 687
 688                 /* note that we'll recurse into class_decref again */
 689                 class_unlink_export(obd->obd_self_export);
 690                 return;
 691         }
 692
 693         if (refs == 0) {
 694                 CDEBUG(D_CONFIG, "finishing cleanup of obd %s (%s)\n",
 695                        obd->obd_name, obd->obd_uuid.uuid);
 696                 LASSERT(!obd->obd_attached);
 697                 if (obd->obd_stopping) {
 698                         /* If we're not stopping, we were never set up */
 699                         err = obd_cleanup(obd);
 700                         if (err)
 701                                 CERROR("Cleanup %s returned %d\n",
 702                                        obd->obd_name, err);
 703                 }
 704                 if (OBP(obd, detach)) {
 705                         err = OBP(obd, detach)(obd);
 706                         if (err)
 707                                 CERROR("Detach returned %d\n", err);
 708                 }
 709                 class_release_dev(obd);
 710         }
 711 }
 712
 713 /** Add a failover nid location.
 714  * Client obd types contact server obd types using this nid list.
 715  */
 716 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 717 {
 718         struct obd_import *imp;
 719         struct obd_uuid uuid;
 720         int rc;
 721         ENTRY;
 722
 723         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 724             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 725                 CERROR("invalid conn_uuid\n");
 726                 RETURN(-EINVAL);
 727         }
 728         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 729             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
 730             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
 731                 CERROR("can't add connection on non-client dev\n");
 732                 RETURN(-EINVAL);
 733         }
 734
 735         imp = obd->u.cli.cl_import;
 736         if (!imp) {
 737                 CERROR("try to add conn on immature client dev\n");
 738                 RETURN(-EINVAL);
 739         }
 740
 741         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 742         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
 743
 744         RETURN(rc);
 745 }
 746
 747 /** Remove a failover nid location.
 748  */
 749 int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 750 {
 751         struct obd_import *imp;
 752         struct obd_uuid uuid;
 753         int rc;
 754         ENTRY;
 755
 756         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 757             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 758                 CERROR("invalid conn_uuid\n");
 759                 RETURN(-EINVAL);
 760         }
 761         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 762             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 763                 CERROR("can't del connection on non-client dev\n");
 764                 RETURN(-EINVAL);
 765         }
 766
 767         imp = obd->u.cli.cl_import;
 768         if (!imp) {
 769                 CERROR("try to del conn on immature client dev\n");
 770                 RETURN(-EINVAL);
 771         }
 772
 773         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 774         rc = obd_del_conn(imp, &uuid);
 775
 776         RETURN(rc);
 777 }
 778
 779 CFS_LIST_HEAD(lustre_profile_list);
 780
 781 struct lustre_profile *class_get_profile(const char * prof)
 782 {
 783         struct lustre_profile *lprof;
 784
 785         ENTRY;
 786         cfs_list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
 787                 if (!strcmp(lprof->lp_profile, prof)) {
 788                         RETURN(lprof);
 789                 }
 790         }
 791         RETURN(NULL);
 792 }
 793
 794 /** Create a named "profile".
 795  * This defines the mdc and osc names to use for a client.
 796  * This also is used to define the lov to be used by a mdt.
 797  */
 798 int class_add_profile(int proflen, char *prof, int osclen, char *osc,
 799                       int mdclen, char *mdc)
 800 {
 801         struct lustre_profile *lprof;
 802         int err = 0;
 803         ENTRY;
 804
 805         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
 806
 807         OBD_ALLOC(lprof, sizeof(*lprof));
 808         if (lprof == NULL)
 809                 RETURN(-ENOMEM);
 810         CFS_INIT_LIST_HEAD(&lprof->lp_list);
 811
 812         LASSERT(proflen == (strlen(prof) + 1));
 813         OBD_ALLOC(lprof->lp_profile, proflen);
 814         if (lprof->lp_profile == NULL)
 815                 GOTO(out, err = -ENOMEM);
 816         memcpy(lprof->lp_profile, prof, proflen);
 817
 818         LASSERT(osclen == (strlen(osc) + 1));
 819         OBD_ALLOC(lprof->lp_dt, osclen);
 820         if (lprof->lp_dt == NULL)
 821                 GOTO(out, err = -ENOMEM);
 822         memcpy(lprof->lp_dt, osc, osclen);
 823
 824         if (mdclen > 0) {
 825                 LASSERT(mdclen == (strlen(mdc) + 1));
 826                 OBD_ALLOC(lprof->lp_md, mdclen);
 827                 if (lprof->lp_md == NULL)
 828                         GOTO(out, err = -ENOMEM);
 829                 memcpy(lprof->lp_md, mdc, mdclen);
 830         }
 831
 832         cfs_list_add(&lprof->lp_list, &lustre_profile_list);
 833         RETURN(err);
 834
 835 out:
 836         if (lprof->lp_md)
 837                 OBD_FREE(lprof->lp_md, mdclen);
 838         if (lprof->lp_dt)
 839                 OBD_FREE(lprof->lp_dt, osclen);
 840         if (lprof->lp_profile)
 841                 OBD_FREE(lprof->lp_profile, proflen);
 842         OBD_FREE(lprof, sizeof(*lprof));
 843         RETURN(err);
 844 }
 845
 846 void class_del_profile(const char *prof)
 847 {
 848         struct lustre_profile *lprof;
 849         ENTRY;
 850
 851         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
 852
 853         lprof = class_get_profile(prof);
 854         if (lprof) {
 855                 cfs_list_del(&lprof->lp_list);
 856                 OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
 857                 OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
 858                 if (lprof->lp_md)
 859                         OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
 860                 OBD_FREE(lprof, sizeof *lprof);
 861         }
 862         EXIT;
 863 }
 864
 865 /* COMPAT_146 */
 866 void class_del_profiles(void)
 867 {
 868         struct lustre_profile *lprof, *n;
 869         ENTRY;
 870
 871         cfs_list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
 872                 cfs_list_del(&lprof->lp_list);
 873                 OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
 874                 OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
 875                 if (lprof->lp_md)
 876                         OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
 877                 OBD_FREE(lprof, sizeof *lprof);
 878         }
 879         EXIT;
 880 }
 881
 882 static int class_set_global(char *ptr, int val, struct lustre_cfg *lcfg)
 883 {
 884         ENTRY;
 885         if (class_match_param(ptr, PARAM_AT_MIN, NULL) == 0)
 886                 at_min = val;
 887         else if (class_match_param(ptr, PARAM_AT_MAX, NULL) == 0)
 888                 at_max = val;
 889         else if (class_match_param(ptr, PARAM_AT_EXTRA, NULL) == 0)
 890                 at_extra = val;
 891         else if (class_match_param(ptr, PARAM_AT_EARLY_MARGIN, NULL) == 0)
 892                 at_early_margin = val;
 893         else if (class_match_param(ptr, PARAM_AT_HISTORY, NULL) == 0)
 894                 at_history = val;
 895         else if (class_match_param(ptr, PARAM_JOBID_VAR, NULL) == 0) {
 896                 memset(obd_jobid_var, 0, JOBSTATS_JOBID_VAR_MAX_LEN + 1);
 897                 memcpy(obd_jobid_var, lustre_cfg_string(lcfg, 2),
 898                        JOBSTATS_JOBID_VAR_MAX_LEN + 1);
 899         } else
 900                 RETURN(-EINVAL);
 901
 902         CDEBUG(D_IOCTL, "global %s = %d\n", ptr, val);
 903         RETURN(0);
 904 }
 905
 906
 907 /* We can't call ll_process_config directly because it lives in a module that
 908    must be loaded after this one. */
 909 static int (*client_process_config)(struct lustre_cfg *lcfg) = NULL;
 910
 911 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg))
 912 {
 913         client_process_config = cpc;
 914 }
 915 EXPORT_SYMBOL(lustre_register_client_process_config);
 916
 917 /**
 918  * Rename the proc parameter in \a cfg with a new name \a new_name.
 919  *
 920  * \param cfg      config structure which contains the proc parameter
 921  * \param new_name new name of the proc parameter
 922  *
 923  * \retval valid-pointer    pointer to the newly-allocated config structure
 924  *                          which contains the renamed proc parameter
 925  * \retval ERR_PTR(-EINVAL) if \a cfg or \a new_name is NULL, or \a cfg does
 926  *                          not contain a proc parameter
 927  * \retval ERR_PTR(-ENOMEM) if memory allocation failure occurs
 928  */
 929 struct lustre_cfg *lustre_cfg_rename(struct lustre_cfg *cfg,
 930                                      const char *new_name)
 931 {
 932         struct lustre_cfg_bufs  *bufs = NULL;
 933         struct lustre_cfg       *new_cfg = NULL;
 934         char                    *param = NULL;
 935         char                    *new_param = NULL;
 936         char                    *value = NULL;
 937         int                      name_len = 0;
 938         int                      new_len = 0;
 939         ENTRY;
 940
 941         if (cfg == NULL || new_name == NULL)
 942                 RETURN(ERR_PTR(-EINVAL));
 943
 944         param = lustre_cfg_string(cfg, 1);
 945         if (param == NULL)
 946                 RETURN(ERR_PTR(-EINVAL));
 947
 948         value = strchr(param, '=');
 949         if (value == NULL)
 950                 name_len = strlen(param);
 951         else
 952                 name_len = value - param;
 953
 954         new_len = LUSTRE_CFG_BUFLEN(cfg, 1) + strlen(new_name) - name_len;
 955
 956         OBD_ALLOC(new_param, new_len);
 957         if (new_param == NULL)
 958                 RETURN(ERR_PTR(-ENOMEM));
 959
 960         strcpy(new_param, new_name);
 961         if (value != NULL)
 962                 strcat(new_param, value);
 963
 964         OBD_ALLOC_PTR(bufs);
 965         if (bufs == NULL) {
 966                 OBD_FREE(new_param, new_len);
 967                 RETURN(ERR_PTR(-ENOMEM));
 968         }
 969
 970         lustre_cfg_bufs_reset(bufs, NULL);
 971         lustre_cfg_bufs_init(bufs, cfg);
 972         lustre_cfg_bufs_set_string(bufs, 1, new_param);
 973
 974         new_cfg = lustre_cfg_new(cfg->lcfg_command, bufs);
 975
 976         OBD_FREE(new_param, new_len);
 977         OBD_FREE_PTR(bufs);
 978         if (new_cfg == NULL)
 979                 RETURN(ERR_PTR(-ENOMEM));
 980
 981         new_cfg->lcfg_num = cfg->lcfg_num;
 982         new_cfg->lcfg_flags = cfg->lcfg_flags;
 983         new_cfg->lcfg_nid = cfg->lcfg_nid;
 984         new_cfg->lcfg_nal = cfg->lcfg_nal;
 985
 986         RETURN(new_cfg);
 987 }
 988 EXPORT_SYMBOL(lustre_cfg_rename);
 989
 990 /** Process configuration commands given in lustre_cfg form.
 991  * These may come from direct calls (e.g. class_manual_cleanup)
 992  * or processing the config llog, or ioctl from lctl.
 993  */
 994 int class_process_config(struct lustre_cfg *lcfg)
 995 {
 996         struct obd_device *obd;
 997         int err;
 998
 999         LASSERT(lcfg && !IS_ERR(lcfg));
1000         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
1001
1002         /* Commands that don't need a device */
1003         switch(lcfg->lcfg_command) {
1004         case LCFG_ATTACH: {
1005                 err = class_attach(lcfg);
1006                 GOTO(out, err);
1007         }
1008         case LCFG_ADD_UUID: {
1009                 CDEBUG(D_IOCTL, "adding mapping from uuid %s to nid "LPX64
1010                        " (%s)\n", lustre_cfg_string(lcfg, 1),
1011                        lcfg->lcfg_nid, libcfs_nid2str(lcfg->lcfg_nid));
1012
1013                 err = class_add_uuid(lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid);
1014                 GOTO(out, err);
1015         }
1016         case LCFG_DEL_UUID: {
1017                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
1018                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) == 0)
1019                        ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
1020
1021                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
1022                 GOTO(out, err);
1023         }
1024         case LCFG_MOUNTOPT: {
1025                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
1026                        lustre_cfg_string(lcfg, 1),
1027                        lustre_cfg_string(lcfg, 2),
1028                        lustre_cfg_string(lcfg, 3));
1029                 /* set these mount options somewhere, so ll_fill_super
1030                  * can find them. */
1031                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
1032                                         lustre_cfg_string(lcfg, 1),
1033                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
1034                                         lustre_cfg_string(lcfg, 2),
1035                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
1036                                         lustre_cfg_string(lcfg, 3));
1037                 GOTO(out, err);
1038         }
1039         case LCFG_DEL_MOUNTOPT: {
1040                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
1041                        lustre_cfg_string(lcfg, 1));
1042                 class_del_profile(lustre_cfg_string(lcfg, 1));
1043                 GOTO(out, err = 0);
1044         }
1045         case LCFG_SET_TIMEOUT: {
1046                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
1047                        obd_timeout, lcfg->lcfg_num);
1048                 obd_timeout = max(lcfg->lcfg_num, 1U);
1049                 GOTO(out, err = 0);
1050         }
1051         case LCFG_SET_LDLM_TIMEOUT: {
1052                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
1053                        ldlm_timeout, lcfg->lcfg_num);
1054                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
1055                 if (ldlm_timeout >= obd_timeout)
1056                         ldlm_timeout = max(obd_timeout / 3, 1U);
1057
1058                 GOTO(out, err = 0);
1059         }
1060         case LCFG_SET_UPCALL: {
1061                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
1062                 /* COMPAT_146 Don't fail on old configs */
1063                 GOTO(out, err = 0);
1064         }
1065         case LCFG_MARKER: {
1066                 struct cfg_marker *marker;
1067                 marker = lustre_cfg_buf(lcfg, 1);
1068                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
1069                        marker->cm_flags, marker->cm_tgtname, marker->cm_comment);
1070                 GOTO(out, err = 0);
1071         }
1072         case LCFG_PARAM: {
1073                 char *tmp;
1074                 /* llite has no obd */
1075                 if ((class_match_param(lustre_cfg_string(lcfg, 1),
1076                                        PARAM_LLITE, 0) == 0) &&
1077                     client_process_config) {
1078                         err = (*client_process_config)(lcfg);
1079                         GOTO(out, err);
1080                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1081                                               PARAM_SYS, &tmp) == 0)) {
1082                         /* Global param settings */
1083                         err = class_set_global(tmp, lcfg->lcfg_num, lcfg);
1084                         /* Note that since LCFG_PARAM is LCFG_REQUIRED, new
1085                            unknown globals would cause config to fail */
1086                         if (err)
1087                                 CWARN("Ignoring unknown param %s\n", tmp);
1088                         GOTO(out, 0);
1089                 }
1090
1091                 /* Fall through */
1092                 break;
1093         }
1094         }
1095
1096         /* Commands that require a device */
1097         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1098         if (obd == NULL) {
1099                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
1100                         CERROR("this lcfg command requires a device name\n");
1101                 else
1102                         CERROR("no device for: %s\n",
1103                                lustre_cfg_string(lcfg, 0));
1104
1105                 GOTO(out, err = -EINVAL);
1106         }
1107
1108         switch(lcfg->lcfg_command) {
1109         case LCFG_SETUP: {
1110                 err = class_setup(obd, lcfg);
1111                 GOTO(out, err);
1112         }
1113         case LCFG_DETACH: {
1114                 err = class_detach(obd, lcfg);
1115                 GOTO(out, err = 0);
1116         }
1117         case LCFG_CLEANUP: {
1118                 err = class_cleanup(obd, lcfg);
1119                 GOTO(out, err = 0);
1120         }
1121         case LCFG_ADD_CONN: {
1122                 err = class_add_conn(obd, lcfg);
1123                 GOTO(out, err = 0);
1124         }
1125         case LCFG_DEL_CONN: {
1126                 err = class_del_conn(obd, lcfg);
1127                 GOTO(out, err = 0);
1128         }
1129         case LCFG_POOL_NEW: {
1130                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
1131                 GOTO(out, err = 0);
1132                 break;
1133         }
1134         case LCFG_POOL_ADD: {
1135                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
1136                                    lustre_cfg_string(lcfg, 3));
1137                 GOTO(out, err = 0);
1138                 break;
1139         }
1140         case LCFG_POOL_REM: {
1141                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
1142                                    lustre_cfg_string(lcfg, 3));
1143                 GOTO(out, err = 0);
1144                 break;
1145         }
1146         case LCFG_POOL_DEL: {
1147                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
1148                 GOTO(out, err = 0);
1149                 break;
1150         }
1151         default: {
1152                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1153                 GOTO(out, err);
1154
1155         }
1156         }
1157 out:
1158         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
1159                 CWARN("Ignoring error %d on optional command %#x\n", err,
1160                       lcfg->lcfg_command);
1161                 err = 0;
1162         }
1163         return err;
1164 }
1165
1166 int class_process_proc_param(char *prefix, struct lprocfs_vars *lvars,
1167                              struct lustre_cfg *lcfg, void *data)
1168 {
1169 #ifdef __KERNEL__
1170         struct lprocfs_vars *var;
1171         char *key, *sval;
1172         int i, keylen, vallen;
1173         int matched = 0, j = 0;
1174         int rc = 0;
1175         int skip = 0;
1176         ENTRY;
1177
1178         if (lcfg->lcfg_command != LCFG_PARAM) {
1179                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1180                 RETURN(-EINVAL);
1181         }
1182
1183         /* e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1184            or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1185            or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36 */
1186         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1187                 key = lustre_cfg_buf(lcfg, i);
1188                 /* Strip off prefix */
1189                 class_match_param(key, prefix, &key);
1190                 sval = strchr(key, '=');
1191                 if (!sval || (*(sval + 1) == 0)) {
1192                         CERROR("Can't parse param %s (missing '=')\n", key);
1193                         /* rc = -EINVAL;        continue parsing other params */
1194                         continue;
1195                 }
1196                 keylen = sval - key;
1197                 sval++;
1198                 vallen = strlen(sval);
1199                 matched = 0;
1200                 j = 0;
1201                 /* Search proc entries */
1202                 while (lvars[j].name) {
1203                         var = &lvars[j];
1204                         if (class_match_param(key, (char *)var->name, 0) == 0 &&
1205                             keylen == strlen(var->name)) {
1206                                 matched++;
1207                                 rc = -EROFS;
1208                                 if (var->write_fptr) {
1209                                         mm_segment_t oldfs;
1210                                         oldfs = get_fs();
1211                                         set_fs(KERNEL_DS);
1212                                         rc = (var->write_fptr)(NULL, sval,
1213                                                                vallen, data);
1214                                         set_fs(oldfs);
1215                                 }
1216                                 break;
1217                         }
1218                         j++;
1219                 }
1220                 if (!matched) {
1221                         /* If the prefix doesn't match, return error so we
1222                            can pass it down the stack */
1223                         if (strnchr(key, keylen, '.'))
1224                             RETURN(-ENOSYS);
1225                         CERROR("%s: unknown param %s\n",
1226                                (char *)lustre_cfg_string(lcfg, 0), key);
1227                         /* rc = -EINVAL;        continue parsing other params */
1228                         skip++;
1229                 } else if (rc < 0) {
1230                         CERROR("writing proc entry %s err %d\n",
1231                                var->name, rc);
1232                         rc = 0;
1233                 } else {
1234                         CDEBUG(D_CONFIG, "%s.%.*s: set parameter %.*s=%s\n",
1235                                       lustre_cfg_string(lcfg, 0),
1236                                       (int)strlen(prefix) - 1, prefix,
1237                                       (int)(sval - key - 1), key, sval);
1238                 }
1239         }
1240
1241         if (rc > 0)
1242                 rc = 0;
1243         if (!rc && skip)
1244                 rc = skip;
1245         RETURN(rc);
1246 #else
1247         CDEBUG(D_CONFIG, "liblustre can't process params.\n");
1248         /* Don't throw config error */
1249         RETURN(0);
1250 #endif
1251 }
1252
1253 int class_config_dump_handler(struct llog_handle * handle,
1254                               struct llog_rec_hdr *rec, void *data);
1255
1256 #ifdef __KERNEL__
1257 extern int lustre_check_exclusion(struct super_block *sb, char *svname);
1258 #else
1259 #define lustre_check_exclusion(a,b)  0
1260 #endif
1261
1262 /** Parse a configuration llog, doing various manipulations on them
1263  * for various reasons, (modifications for compatibility, skip obsolete
1264  * records, change uuids, etc), then class_process_config() resulting
1265  * net records.
1266  */
1267 static int class_config_llog_handler(struct llog_handle * handle,
1268                                      struct llog_rec_hdr *rec, void *data)
1269 {
1270         struct config_llog_instance *clli = data;
1271         int cfg_len = rec->lrh_len;
1272         char *cfg_buf = (char*) (rec + 1);
1273         int rc = 0;
1274         ENTRY;
1275
1276         //class_config_dump_handler(handle, rec, data);
1277
1278         switch (rec->lrh_type) {
1279         case OBD_CFG_REC: {
1280                 struct lustre_cfg *lcfg, *lcfg_new;
1281                 struct lustre_cfg_bufs bufs;
1282                 char *inst_name = NULL;
1283                 int inst_len = 0;
1284                 int inst = 0, swab = 0;
1285
1286                 lcfg = (struct lustre_cfg *)cfg_buf;
1287                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1288                         lustre_swab_lustre_cfg(lcfg);
1289                         swab = 1;
1290                 }
1291
1292                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1293                 if (rc)
1294                         GOTO(out, rc);
1295
1296                 /* Figure out config state info */
1297                 if (lcfg->lcfg_command == LCFG_MARKER) {
1298                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1299                         lustre_swab_cfg_marker(marker, swab,
1300                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1301                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1302                                clli->cfg_flags, marker->cm_flags);
1303                         if (marker->cm_flags & CM_START) {
1304                                 /* all previous flags off */
1305                                 clli->cfg_flags = CFG_F_MARKER;
1306                                 if (marker->cm_flags & CM_SKIP) {
1307                                         clli->cfg_flags |= CFG_F_SKIP;
1308                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1309                                                marker->cm_step);
1310                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1311                                            (clli->cfg_sb &&
1312                                             lustre_check_exclusion(clli->cfg_sb,
1313                                                          marker->cm_tgtname))) {
1314                                         clli->cfg_flags |= CFG_F_EXCLUDE;
1315                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1316                                                marker->cm_step);
1317                                 }
1318                         } else if (marker->cm_flags & CM_END) {
1319                                 clli->cfg_flags = 0;
1320                         }
1321                 }
1322                 /* A config command without a start marker before it is
1323                    illegal (post 146) */
1324                 if (!(clli->cfg_flags & CFG_F_COMPAT146) &&
1325                     !(clli->cfg_flags & CFG_F_MARKER) &&
1326                     (lcfg->lcfg_command != LCFG_MARKER)) {
1327                         CWARN("Config not inside markers, ignoring! "
1328                               "(inst: %p, uuid: %s, flags: %#x)\n",
1329                               clli->cfg_instance,
1330                               clli->cfg_uuid.uuid, clli->cfg_flags);
1331                         clli->cfg_flags |= CFG_F_SKIP;
1332                 }
1333                 if (clli->cfg_flags & CFG_F_SKIP) {
1334                         CDEBUG(D_CONFIG, "skipping %#x\n",
1335                                clli->cfg_flags);
1336                         rc = 0;
1337                         /* No processing! */
1338                         break;
1339                 }
1340
1341                 /*
1342                  * For interoperability between 1.8 and 2.0,
1343                  * rename "mds" obd device type to "mdt".
1344                  */
1345                 {
1346                         char *typename = lustre_cfg_string(lcfg, 1);
1347                         char *index = lustre_cfg_string(lcfg, 2);
1348
1349                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1350                              strcmp(typename, "mds") == 0)) {
1351                                 CWARN("For 1.8 interoperability, rename obd "
1352                                        "type from mds to mdt\n");
1353                                 typename[2] = 't';
1354                         }
1355                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1356                              strcmp(index, "type") == 0)) {
1357                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1358                                        "set this index to '0'\n");
1359                                 index[0] = '0';
1360                                 index[1] = 0;
1361                         }
1362                 }
1363
1364                 if ((clli->cfg_flags & CFG_F_EXCLUDE) &&
1365                     (lcfg->lcfg_command == LCFG_LOV_ADD_OBD))
1366                         /* Add inactive instead */
1367                         lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1368
1369                 lustre_cfg_bufs_init(&bufs, lcfg);
1370
1371                 if (clli && clli->cfg_instance &&
1372                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0){
1373                         inst = 1;
1374                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1375                                    sizeof(clli->cfg_instance) * 2 + 4;
1376                         OBD_ALLOC(inst_name, inst_len);
1377                         if (inst_name == NULL)
1378                                 GOTO(out, rc = -ENOMEM);
1379                         sprintf(inst_name, "%s-%p",
1380                                 lustre_cfg_string(lcfg, 0),
1381                                 clli->cfg_instance);
1382                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1383                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1384                                lcfg->lcfg_command, inst_name);
1385                 }
1386
1387                 /* we override the llog's uuid for clients, to insure they
1388                 are unique */
1389                 if (clli && clli->cfg_instance != NULL &&
1390                     lcfg->lcfg_command == LCFG_ATTACH) {
1391                         lustre_cfg_bufs_set_string(&bufs, 2,
1392                                                    clli->cfg_uuid.uuid);
1393                 }
1394                 /*
1395                  * sptlrpc config record, we expect 2 data segments:
1396                  *  [0]: fs_name/target_name,
1397                  *  [1]: rule string
1398                  * moving them to index [1] and [2], and insert MGC's
1399                  * obdname at index [0].
1400                  */
1401                 if (clli && clli->cfg_instance == NULL &&
1402                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1403                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1404                                             bufs.lcfg_buflen[1]);
1405                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1406                                             bufs.lcfg_buflen[0]);
1407                         lustre_cfg_bufs_set_string(&bufs, 0,
1408                                                    clli->cfg_obdname);
1409                 }
1410
1411                 lcfg_new = lustre_cfg_new(lcfg->lcfg_command, &bufs);
1412
1413                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1414                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1415
1416                 /* XXX Hack to try to remain binary compatible with
1417                  * pre-newconfig logs */
1418                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1419                     (lcfg->lcfg_nid >> 32) == 0) {
1420                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1421
1422                         lcfg_new->lcfg_nid =
1423                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1424                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
1425                               lcfg->lcfg_nal, addr,
1426                               libcfs_nid2str(lcfg_new->lcfg_nid));
1427                 } else {
1428                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
1429                 }
1430
1431                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
1432
1433                 rc = class_process_config(lcfg_new);
1434                 lustre_cfg_free(lcfg_new);
1435
1436                 if (inst)
1437                         OBD_FREE(inst_name, inst_len);
1438                 break;
1439         }
1440         default:
1441                 CERROR("Unknown llog record type %#x encountered\n",
1442                        rec->lrh_type);
1443                 break;
1444         }
1445 out:
1446         if (rc) {
1447                 CERROR("Err %d on cfg command:\n", rc);
1448                 class_config_dump_handler(handle, rec, data);
1449         }
1450         RETURN(rc);
1451 }
1452
1453 int class_config_parse_llog(struct llog_ctxt *ctxt, char *name,
1454                             struct config_llog_instance *cfg)
1455 {
1456         struct llog_process_cat_data cd = {0, 0};
1457         struct llog_handle *llh;
1458         int rc, rc2;
1459         ENTRY;
1460
1461         CDEBUG(D_INFO, "looking up llog %s\n", name);
1462         rc = llog_create(ctxt, &llh, NULL, name);
1463         if (rc)
1464                 RETURN(rc);
1465
1466         rc = llog_init_handle(llh, LLOG_F_IS_PLAIN, NULL);
1467         if (rc)
1468                 GOTO(parse_out, rc);
1469
1470         /* continue processing from where we last stopped to end-of-log */
1471         if (cfg)
1472                 cd.lpcd_first_idx = cfg->cfg_last_idx;
1473         cd.lpcd_last_idx = 0;
1474
1475         rc = llog_process(llh, class_config_llog_handler, cfg, &cd);
1476
1477         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
1478                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
1479
1480         if (cfg)
1481                 cfg->cfg_last_idx = cd.lpcd_last_idx;
1482
1483 parse_out:
1484         rc2 = llog_close(llh);
1485         if (rc == 0)
1486                 rc = rc2;
1487
1488         RETURN(rc);
1489 }
1490
1491 int class_config_dump_handler(struct llog_handle * handle,
1492                               struct llog_rec_hdr *rec, void *data)
1493 {
1494         int cfg_len = rec->lrh_len;
1495         char *cfg_buf = (char*) (rec + 1);
1496         char *outstr, *ptr, *end;
1497         int rc = 0;
1498         ENTRY;
1499
1500         OBD_ALLOC(outstr, 256);
1501         end = outstr + 256;
1502         ptr = outstr;
1503         if (!outstr) {
1504                 RETURN(-ENOMEM);
1505         }
1506         if (rec->lrh_type == OBD_CFG_REC) {
1507                 struct lustre_cfg *lcfg;
1508                 int i;
1509
1510                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1511                 if (rc)
1512                         GOTO(out, rc);
1513                 lcfg = (struct lustre_cfg *)cfg_buf;
1514
1515                 ptr += snprintf(ptr, end-ptr, "cmd=%05x ",
1516                                 lcfg->lcfg_command);
1517                 if (lcfg->lcfg_flags) {
1518                         ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
1519                                         lcfg->lcfg_flags);
1520                 }
1521                 if (lcfg->lcfg_num) {
1522                         ptr += snprintf(ptr, end-ptr, "num=%#08x ",
1523                                         lcfg->lcfg_num);
1524                 }
1525                 if (lcfg->lcfg_nid) {
1526                         ptr += snprintf(ptr, end-ptr, "nid=%s("LPX64")\n     ",
1527                                         libcfs_nid2str(lcfg->lcfg_nid),
1528                                         lcfg->lcfg_nid);
1529                 }
1530                 if (lcfg->lcfg_command == LCFG_MARKER) {
1531                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1532                         ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
1533                                         marker->cm_step, marker->cm_flags,
1534                                         marker->cm_tgtname, marker->cm_comment);
1535                 } else {
1536                         for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
1537                                 ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
1538                                                 lustre_cfg_string(lcfg, i));
1539                         }
1540                 }
1541                 LCONSOLE(D_WARNING, "   %s\n", outstr);
1542         } else {
1543                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
1544                 rc = -EINVAL;
1545         }
1546 out:
1547         OBD_FREE(outstr, 256);
1548         RETURN(rc);
1549 }
1550
1551 int class_config_dump_llog(struct llog_ctxt *ctxt, char *name,
1552                            struct config_llog_instance *cfg)
1553 {
1554         struct llog_handle *llh;
1555         int rc, rc2;
1556         ENTRY;
1557
1558         LCONSOLE_INFO("Dumping config log %s\n", name);
1559
1560         rc = llog_create(ctxt, &llh, NULL, name);
1561         if (rc)
1562                 RETURN(rc);
1563
1564         rc = llog_init_handle(llh, LLOG_F_IS_PLAIN, NULL);
1565         if (rc)
1566                 GOTO(parse_out, rc);
1567
1568         rc = llog_process(llh, class_config_dump_handler, cfg, NULL);
1569 parse_out:
1570         rc2 = llog_close(llh);
1571         if (rc == 0)
1572                 rc = rc2;
1573
1574         LCONSOLE_INFO("End config log %s\n", name);
1575         RETURN(rc);
1576
1577 }
1578
1579 /** Call class_cleanup and class_detach.
1580  * "Manual" only in the sense that we're faking lcfg commands.
1581  */
1582 int class_manual_cleanup(struct obd_device *obd)
1583 {
1584         char                    flags[3] = "";
1585         struct lustre_cfg      *lcfg;
1586         struct lustre_cfg_bufs  bufs;
1587         int                     rc;
1588         ENTRY;
1589
1590         if (!obd) {
1591                 CERROR("empty cleanup\n");
1592                 RETURN(-EALREADY);
1593         }
1594
1595         if (obd->obd_force)
1596                 strcat(flags, "F");
1597         if (obd->obd_fail)
1598                 strcat(flags, "A");
1599
1600         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
1601                obd->obd_name, flags);
1602
1603         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
1604         lustre_cfg_bufs_set_string(&bufs, 1, flags);
1605         lcfg = lustre_cfg_new(LCFG_CLEANUP, &bufs);
1606         if (!lcfg)
1607                 RETURN(-ENOMEM);
1608
1609         rc = class_process_config(lcfg);
1610         if (rc) {
1611                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
1612                 GOTO(out, rc);
1613         }
1614
1615         /* the lcfg is almost the same for both ops */
1616         lcfg->lcfg_command = LCFG_DETACH;
1617         rc = class_process_config(lcfg);
1618         if (rc)
1619                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
1620 out:
1621         lustre_cfg_free(lcfg);
1622         RETURN(rc);
1623 }
1624
1625 /*
1626  * uuid<->export lustre hash operations
1627  */
1628
1629 static unsigned
1630 uuid_hash(cfs_hash_t *hs, const void *key, unsigned mask)
1631 {
1632         return cfs_hash_djb2_hash(((struct obd_uuid *)key)->uuid,
1633                                   sizeof(((struct obd_uuid *)key)->uuid), mask);
1634 }
1635
1636 static void *
1637 uuid_key(cfs_hlist_node_t *hnode)
1638 {
1639         struct obd_export *exp;
1640
1641         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1642
1643         return &exp->exp_client_uuid;
1644 }
1645
1646 /*
1647  * NOTE: It is impossible to find an export that is in failed
1648  *       state with this function
1649  */
1650 static int
1651 uuid_keycmp(const void *key, cfs_hlist_node_t *hnode)
1652 {
1653         struct obd_export *exp;
1654
1655         LASSERT(key);
1656         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1657
1658         return obd_uuid_equals(key, &exp->exp_client_uuid) &&
1659                !exp->exp_failed;
1660 }
1661
1662 static void *
1663 uuid_export_object(cfs_hlist_node_t *hnode)
1664 {
1665         return cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1666 }
1667
1668 static void
1669 uuid_export_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1670 {
1671         struct obd_export *exp;
1672
1673         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1674         class_export_get(exp);
1675 }
1676
1677 static void
1678 uuid_export_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1679 {
1680         struct obd_export *exp;
1681
1682         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1683         class_export_put(exp);
1684 }
1685
1686 static cfs_hash_ops_t uuid_hash_ops = {
1687         .hs_hash        = uuid_hash,
1688         .hs_key         = uuid_key,
1689         .hs_keycmp      = uuid_keycmp,
1690         .hs_object      = uuid_export_object,
1691         .hs_get         = uuid_export_get,
1692         .hs_put_locked  = uuid_export_put_locked,
1693 };
1694
1695
1696 /*
1697  * nid<->export hash operations
1698  */
1699
1700 static unsigned
1701 nid_hash(cfs_hash_t *hs, const void *key, unsigned mask)
1702 {
1703         return cfs_hash_djb2_hash(key, sizeof(lnet_nid_t), mask);
1704 }
1705
1706 static void *
1707 nid_key(cfs_hlist_node_t *hnode)
1708 {
1709         struct obd_export *exp;
1710
1711         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1712
1713         RETURN(&exp->exp_connection->c_peer.nid);
1714 }
1715
1716 /*
1717  * NOTE: It is impossible to find an export that is in failed
1718  *       state with this function
1719  */
1720 static int
1721 nid_kepcmp(const void *key, cfs_hlist_node_t *hnode)
1722 {
1723         struct obd_export *exp;
1724
1725         LASSERT(key);
1726         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1727
1728         RETURN(exp->exp_connection->c_peer.nid == *(lnet_nid_t *)key &&
1729                !exp->exp_failed);
1730 }
1731
1732 static void *
1733 nid_export_object(cfs_hlist_node_t *hnode)
1734 {
1735         return cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1736 }
1737
1738 static void
1739 nid_export_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1740 {
1741         struct obd_export *exp;
1742
1743         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1744         class_export_get(exp);
1745 }
1746
1747 static void
1748 nid_export_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1749 {
1750         struct obd_export *exp;
1751
1752         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1753         class_export_put(exp);
1754 }
1755
1756 static cfs_hash_ops_t nid_hash_ops = {
1757         .hs_hash        = nid_hash,
1758         .hs_key         = nid_key,
1759         .hs_keycmp      = nid_kepcmp,
1760         .hs_object      = nid_export_object,
1761         .hs_get         = nid_export_get,
1762         .hs_put_locked  = nid_export_put_locked,
1763 };
1764
1765
1766 /*
1767  * nid<->nidstats hash operations
1768  */
1769
1770 static void *
1771 nidstats_key(cfs_hlist_node_t *hnode)
1772 {
1773         struct nid_stat *ns;
1774
1775         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1776
1777         return &ns->nid;
1778 }
1779
1780 static int
1781 nidstats_keycmp(const void *key, cfs_hlist_node_t *hnode)
1782 {
1783         return *(lnet_nid_t *)nidstats_key(hnode) == *(lnet_nid_t *)key;
1784 }
1785
1786 static void *
1787 nidstats_object(cfs_hlist_node_t *hnode)
1788 {
1789         return cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1790 }
1791
1792 static void
1793 nidstats_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1794 {
1795         struct nid_stat *ns;
1796
1797         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1798         nidstat_getref(ns);
1799 }
1800
1801 static void
1802 nidstats_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1803 {
1804         struct nid_stat *ns;
1805
1806         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1807         nidstat_putref(ns);
1808 }
1809
1810 static cfs_hash_ops_t nid_stat_hash_ops = {
1811         .hs_hash        = nid_hash,
1812         .hs_key         = nidstats_key,
1813         .hs_keycmp      = nidstats_keycmp,
1814         .hs_object      = nidstats_object,
1815         .hs_get         = nidstats_get,
1816         .hs_put_locked  = nidstats_put_locked,
1817 };