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 <string.h>
  48 #include <obd_class.h>
  49 #include <obd.h>
  50 #endif
  51 #include <lustre_param.h>
  52
  53 #include "llog_internal.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 EXPORT_SYMBOL(class_find_param);
  78
  79 /**
  80  * Check whether the proc parameter \a param is an old parameter or not from
  81  * the array \a ptr which contains the mapping from old parameters to new ones.
  82  * If it's an old one, then return the pointer to the cfg_interop_param struc-
  83  * ture which contains both the old and new parameters.
  84  *
  85  * \param param                 proc parameter
  86  * \param ptr                   an array which contains the mapping from
  87  *                              old parameters to new ones
  88  *
  89  * \retval valid-pointer        pointer to the cfg_interop_param structure
  90  *                              which contains the old and new parameters
  91  * \retval NULL                 \a param or \a ptr is NULL,
  92  *                              or \a param is not an old parameter
  93  */
  94 struct cfg_interop_param *class_find_old_param(const char *param,
  95                                                struct cfg_interop_param *ptr)
  96 {
  97         char *value = NULL;
  98         int   name_len = 0;
  99
 100         if (param == NULL || ptr == NULL)
 101                 RETURN(NULL);
 102
 103         value = strchr(param, '=');
 104         if (value == NULL)
 105                 name_len = strlen(param);
 106         else
 107                 name_len = value - param;
 108
 109         while (ptr->old_param != NULL) {
 110                 if (strncmp(param, ptr->old_param, name_len) == 0 &&
 111                     name_len == strlen(ptr->old_param))
 112                         RETURN(ptr);
 113                 ptr++;
 114         }
 115
 116         RETURN(NULL);
 117 }
 118 EXPORT_SYMBOL(class_find_old_param);
 119
 120 /**
 121  * Finds a parameter in \a params and copies it to \a copy.
 122  *
 123  * Leading spaces are skipped. Next space or end of string is the
 124  * parameter terminator with the exception that spaces inside single or double
 125  * quotes get included into a parameter. The parameter is copied into \a copy
 126  * which has to be allocated big enough by a caller, quotes are stripped in
 127  * the copy and the copy is terminated by 0.
 128  *
 129  * On return \a params is set to next parameter or to NULL if last
 130  * parameter is returned.
 131  *
 132  * \retval 0 if parameter is returned in \a copy
 133  * \retval 1 otherwise
 134  * \retval -EINVAL if unbalanced quota is found
 135  */
 136 int class_get_next_param(char **params, char *copy)
 137 {
 138         char *q1, *q2, *str;
 139         int len;
 140
 141         str = *params;
 142         while (*str == ' ')
 143                 str++;
 144
 145         if (*str == '\0') {
 146                 *params = NULL;
 147                 return 1;
 148         }
 149
 150         while (1) {
 151                 q1 = strpbrk(str, " '\"");
 152                 if (q1 == NULL) {
 153                         len = strlen(str);
 154                         memcpy(copy, str, len);
 155                         copy[len] = '\0';
 156                         *params = NULL;
 157                         return 0;
 158                 }
 159                 len = q1 - str;
 160                 if (*q1 == ' ') {
 161                         memcpy(copy, str, len);
 162                         copy[len] = '\0';
 163                         *params = str + len;
 164                         return 0;
 165                 }
 166
 167                 memcpy(copy, str, len);
 168                 copy += len;
 169
 170                 /* search for the matching closing quote */
 171                 str = q1 + 1;
 172                 q2 = strchr(str, *q1);
 173                 if (q2 == NULL) {
 174                         CERROR("Unbalanced quota in parameters: \"%s\"\n",
 175                                *params);
 176                         return -EINVAL;
 177                 }
 178                 len = q2 - str;
 179                 memcpy(copy, str, len);
 180                 copy += len;
 181                 str = q2 + 1;
 182         }
 183         return 1;
 184 }
 185 EXPORT_SYMBOL(class_get_next_param);
 186
 187 /* returns 0 if this is the first key in the buffer, else 1.
 188    valp points to first char after key. */
 189 int class_match_param(char *buf, char *key, char **valp)
 190 {
 191         if (!buf)
 192                 return 1;
 193
 194         if (memcmp(buf, key, strlen(key)) != 0)
 195                 return 1;
 196
 197         if (valp)
 198                 *valp = buf + strlen(key);
 199
 200         return 0;
 201 }
 202 EXPORT_SYMBOL(class_match_param);
 203
 204 static int parse_nid(char *buf, void *value)
 205 {
 206         lnet_nid_t *nid = (lnet_nid_t *)value;
 207
 208         *nid = libcfs_str2nid(buf);
 209         if (*nid != LNET_NID_ANY)
 210                 return 0;
 211
 212         LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
 213         return -EINVAL;
 214 }
 215
 216 static int parse_net(char *buf, void *value)
 217 {
 218         __u32 *net = (__u32 *)value;
 219
 220         *net = libcfs_str2net(buf);
 221         CDEBUG(D_INFO, "Net %s\n", libcfs_net2str(*net));
 222         return 0;
 223 }
 224
 225 enum {
 226         CLASS_PARSE_NID = 1,
 227         CLASS_PARSE_NET,
 228 };
 229
 230 /* 0 is good nid,
 231    1 not found
 232    < 0 error
 233    endh is set to next separator */
 234 static int class_parse_value(char *buf, int opc, void *value, char **endh)
 235 {
 236         char *endp;
 237         char  tmp;
 238         int   rc = 0;
 239
 240         if (!buf)
 241                 return 1;
 242         while (*buf == ',' || *buf == ':')
 243                 buf++;
 244         if (*buf == ' ' || *buf == '/' || *buf == '\0')
 245                 return 1;
 246
 247         /* nid separators or end of nids */
 248         endp = strpbrk(buf, ",: /");
 249         if (endp == NULL)
 250                 endp = buf + strlen(buf);
 251
 252         tmp = *endp;
 253         *endp = '\0';
 254         switch (opc) {
 255         default:
 256                 LBUG();
 257         case CLASS_PARSE_NID:
 258                 rc = parse_nid(buf, value);
 259                 break;
 260         case CLASS_PARSE_NET:
 261                 rc = parse_net(buf, value);
 262                 break;
 263         }
 264         *endp = tmp;
 265         if (rc != 0)
 266                 return rc;
 267         if (endh)
 268                 *endh = endp;
 269         return 0;
 270 }
 271
 272 int class_parse_nid(char *buf, lnet_nid_t *nid, char **endh)
 273 {
 274         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh);
 275 }
 276 EXPORT_SYMBOL(class_parse_nid);
 277
 278 int class_parse_net(char *buf, __u32 *net, char **endh)
 279 {
 280         return class_parse_value(buf, CLASS_PARSE_NET, (void *)net, endh);
 281 }
 282 EXPORT_SYMBOL(class_parse_net);
 283
 284 /* 1 param contains key and match
 285  * 0 param contains key and not match
 286  * -1 param does not contain key
 287  */
 288 int class_match_nid(char *buf, char *key, lnet_nid_t nid)
 289 {
 290         lnet_nid_t tmp;
 291         int   rc = -1;
 292
 293         while (class_find_param(buf, key, &buf) == 0) {
 294                 /* please restrict to the nids pertaining to
 295                  * the specified nids */
 296                 while (class_parse_nid(buf, &tmp, &buf) == 0) {
 297                         if (tmp == nid)
 298                                 return 1;
 299                 }
 300                 rc = 0;
 301         }
 302         return rc;
 303 }
 304 EXPORT_SYMBOL(class_match_nid);
 305
 306 int class_match_net(char *buf, char *key, __u32 net)
 307 {
 308         __u32 tmp;
 309         int   rc = -1;
 310
 311         while (class_find_param(buf, key, &buf) == 0) {
 312                 /* please restrict to the nids pertaining to
 313                  * the specified networks */
 314                 while (class_parse_net(buf, &tmp, &buf) == 0) {
 315                         if (tmp == net)
 316                                 return 1;
 317                 }
 318                 rc = 0;
 319         }
 320         return rc;
 321 }
 322 EXPORT_SYMBOL(class_match_net);
 323
 324 /********************** class fns **********************/
 325
 326 /**
 327  * Create a new obd device and set the type, name and uuid.  If successful,
 328  * the new device can be accessed by either name or uuid.
 329  */
 330 int class_attach(struct lustre_cfg *lcfg)
 331 {
 332         struct obd_device *obd = NULL;
 333         char *typename, *name, *uuid;
 334         int rc, len;
 335         ENTRY;
 336
 337         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 338                 CERROR("No type passed!\n");
 339                 RETURN(-EINVAL);
 340         }
 341         typename = lustre_cfg_string(lcfg, 1);
 342
 343         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 344                 CERROR("No name passed!\n");
 345                 RETURN(-EINVAL);
 346         }
 347         name = lustre_cfg_string(lcfg, 0);
 348
 349         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 350                 CERROR("No UUID passed!\n");
 351                 RETURN(-EINVAL);
 352         }
 353         uuid = lustre_cfg_string(lcfg, 2);
 354
 355         CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 356                MKSTR(typename), MKSTR(name), MKSTR(uuid));
 357
 358         obd = class_newdev(typename, name);
 359         if (IS_ERR(obd)) {
 360                 /* Already exists or out of obds */
 361                 rc = PTR_ERR(obd);
 362                 obd = NULL;
 363                 CERROR("Cannot create device %s of type %s : %d\n",
 364                        name, typename, rc);
 365                 GOTO(out, rc);
 366         }
 367         LASSERTF(obd != NULL, "Cannot get obd device %s of type %s\n",
 368                  name, typename);
 369         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 370                  "obd %p obd_magic %08X != %08X\n",
 371                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 372         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 373                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 374
 375         cfs_rwlock_init(&obd->obd_pool_lock);
 376         obd->obd_pool_limit = 0;
 377         obd->obd_pool_slv = 0;
 378
 379         CFS_INIT_LIST_HEAD(&obd->obd_exports);
 380         CFS_INIT_LIST_HEAD(&obd->obd_unlinked_exports);
 381         CFS_INIT_LIST_HEAD(&obd->obd_delayed_exports);
 382         CFS_INIT_LIST_HEAD(&obd->obd_exports_timed);
 383         CFS_INIT_LIST_HEAD(&obd->obd_nid_stats);
 384         cfs_spin_lock_init(&obd->obd_nid_lock);
 385         cfs_spin_lock_init(&obd->obd_dev_lock);
 386         cfs_mutex_init(&obd->obd_dev_mutex);
 387         cfs_spin_lock_init(&obd->obd_osfs_lock);
 388         /* obd->obd_osfs_age must be set to a value in the distant
 389          * past to guarantee a fresh statfs is fetched on mount. */
 390         obd->obd_osfs_age = cfs_time_shift_64(-1000);
 391
 392         /* XXX belongs in setup not attach  */
 393         cfs_init_rwsem(&obd->obd_observer_link_sem);
 394         /* recovery data */
 395         cfs_init_timer(&obd->obd_recovery_timer);
 396         cfs_spin_lock_init(&obd->obd_recovery_task_lock);
 397         cfs_waitq_init(&obd->obd_next_transno_waitq);
 398         cfs_waitq_init(&obd->obd_evict_inprogress_waitq);
 399         CFS_INIT_LIST_HEAD(&obd->obd_req_replay_queue);
 400         CFS_INIT_LIST_HEAD(&obd->obd_lock_replay_queue);
 401         CFS_INIT_LIST_HEAD(&obd->obd_final_req_queue);
 402         CFS_INIT_LIST_HEAD(&obd->obd_evict_list);
 403
 404         llog_group_init(&obd->obd_olg, FID_SEQ_LLOG);
 405
 406         obd->obd_conn_inprogress = 0;
 407
 408         len = strlen(uuid);
 409         if (len >= sizeof(obd->obd_uuid)) {
 410                 CERROR("uuid must be < %d bytes long\n",
 411                        (int)sizeof(obd->obd_uuid));
 412                 GOTO(out, rc = -EINVAL);
 413         }
 414         memcpy(obd->obd_uuid.uuid, uuid, len);
 415
 416         /* do the attach */
 417         if (OBP(obd, attach)) {
 418                 rc = OBP(obd,attach)(obd, sizeof *lcfg, lcfg);
 419                 if (rc)
 420                         GOTO(out, rc = -EINVAL);
 421         }
 422
 423         /* Detach drops this */
 424         cfs_spin_lock(&obd->obd_dev_lock);
 425         cfs_atomic_set(&obd->obd_refcount, 1);
 426         cfs_spin_unlock(&obd->obd_dev_lock);
 427         lu_ref_init(&obd->obd_reference);
 428         lu_ref_add(&obd->obd_reference, "attach", obd);
 429
 430         obd->obd_attached = 1;
 431         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 432                obd->obd_minor, typename, cfs_atomic_read(&obd->obd_refcount));
 433         RETURN(0);
 434  out:
 435         if (obd != NULL) {
 436                 class_release_dev(obd);
 437         }
 438         return rc;
 439 }
 440 EXPORT_SYMBOL(class_attach);
 441
 442 /** Create hashes, self-export, and call type-specific setup.
 443  * Setup is effectively the "start this obd" call.
 444  */
 445 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 446 {
 447         int err = 0;
 448         struct obd_export *exp;
 449         ENTRY;
 450
 451         LASSERT(obd != NULL);
 452         LASSERTF(obd == class_num2obd(obd->obd_minor),
 453                  "obd %p != obd_devs[%d] %p\n",
 454                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 455         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 456                  "obd %p obd_magic %08x != %08x\n",
 457                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 458
 459         /* have we attached a type to this device? */
 460         if (!obd->obd_attached) {
 461                 CERROR("Device %d not attached\n", obd->obd_minor);
 462                 RETURN(-ENODEV);
 463         }
 464
 465         if (obd->obd_set_up) {
 466                 CERROR("Device %d already setup (type %s)\n",
 467                        obd->obd_minor, obd->obd_type->typ_name);
 468                 RETURN(-EEXIST);
 469         }
 470
 471         /* is someone else setting us up right now? (attach inits spinlock) */
 472         cfs_spin_lock(&obd->obd_dev_lock);
 473         if (obd->obd_starting) {
 474                 cfs_spin_unlock(&obd->obd_dev_lock);
 475                 CERROR("Device %d setup in progress (type %s)\n",
 476                        obd->obd_minor, obd->obd_type->typ_name);
 477                 RETURN(-EEXIST);
 478         }
 479         /* just leave this on forever.  I can't use obd_set_up here because
 480            other fns check that status, and we're not actually set up yet. */
 481         obd->obd_starting = 1;
 482         obd->obd_uuid_hash = NULL;
 483         obd->obd_nid_hash = NULL;
 484         obd->obd_nid_stats_hash = NULL;
 485         cfs_spin_unlock(&obd->obd_dev_lock);
 486
 487         /* create an uuid-export lustre hash */
 488         obd->obd_uuid_hash = cfs_hash_create("UUID_HASH",
 489                                              HASH_UUID_CUR_BITS,
 490                                              HASH_UUID_MAX_BITS,
 491                                              HASH_UUID_BKT_BITS, 0,
 492                                              CFS_HASH_MIN_THETA,
 493                                              CFS_HASH_MAX_THETA,
 494                                              &uuid_hash_ops, CFS_HASH_DEFAULT);
 495         if (!obd->obd_uuid_hash)
 496                 GOTO(err_hash, err = -ENOMEM);
 497
 498         /* create a nid-export lustre hash */
 499         obd->obd_nid_hash = cfs_hash_create("NID_HASH",
 500                                             HASH_NID_CUR_BITS,
 501                                             HASH_NID_MAX_BITS,
 502                                             HASH_NID_BKT_BITS, 0,
 503                                             CFS_HASH_MIN_THETA,
 504                                             CFS_HASH_MAX_THETA,
 505                                             &nid_hash_ops, CFS_HASH_DEFAULT);
 506         if (!obd->obd_nid_hash)
 507                 GOTO(err_hash, err = -ENOMEM);
 508
 509         /* create a nid-stats lustre hash */
 510         obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
 511                                                   HASH_NID_STATS_CUR_BITS,
 512                                                   HASH_NID_STATS_MAX_BITS,
 513                                                   HASH_NID_STATS_BKT_BITS, 0,
 514                                                   CFS_HASH_MIN_THETA,
 515                                                   CFS_HASH_MAX_THETA,
 516                                                   &nid_stat_hash_ops, CFS_HASH_DEFAULT);
 517         if (!obd->obd_nid_stats_hash)
 518                 GOTO(err_hash, err = -ENOMEM);
 519
 520         exp = class_new_export(obd, &obd->obd_uuid);
 521         if (IS_ERR(exp))
 522                 GOTO(err_hash, err = PTR_ERR(exp));
 523
 524         obd->obd_self_export = exp;
 525         cfs_list_del_init(&exp->exp_obd_chain_timed);
 526         class_export_put(exp);
 527
 528         err = obd_setup(obd, lcfg);
 529         if (err)
 530                 GOTO(err_exp, err);
 531
 532         obd->obd_set_up = 1;
 533
 534         cfs_spin_lock(&obd->obd_dev_lock);
 535         /* cleanup drops this */
 536         class_incref(obd, "setup", obd);
 537         cfs_spin_unlock(&obd->obd_dev_lock);
 538
 539         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 540                obd->obd_name, obd->obd_uuid.uuid);
 541
 542         RETURN(0);
 543 err_exp:
 544         if (obd->obd_self_export) {
 545                 class_unlink_export(obd->obd_self_export);
 546                 obd->obd_self_export = NULL;
 547         }
 548 err_hash:
 549         if (obd->obd_uuid_hash) {
 550                 cfs_hash_putref(obd->obd_uuid_hash);
 551                 obd->obd_uuid_hash = NULL;
 552         }
 553         if (obd->obd_nid_hash) {
 554                 cfs_hash_putref(obd->obd_nid_hash);
 555                 obd->obd_nid_hash = NULL;
 556         }
 557         if (obd->obd_nid_stats_hash) {
 558                 cfs_hash_putref(obd->obd_nid_stats_hash);
 559                 obd->obd_nid_stats_hash = NULL;
 560         }
 561         obd->obd_starting = 0;
 562         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 563         return err;
 564 }
 565 EXPORT_SYMBOL(class_setup);
 566
 567 /** We have finished using this obd and are ready to destroy it.
 568  * There can be no more references to this obd.
 569  */
 570 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 571 {
 572         ENTRY;
 573
 574         if (obd->obd_set_up) {
 575                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 576                 RETURN(-EBUSY);
 577         }
 578
 579         cfs_spin_lock(&obd->obd_dev_lock);
 580         if (!obd->obd_attached) {
 581                 cfs_spin_unlock(&obd->obd_dev_lock);
 582                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 583                 RETURN(-ENODEV);
 584         }
 585         obd->obd_attached = 0;
 586         cfs_spin_unlock(&obd->obd_dev_lock);
 587
 588         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 589                obd->obd_name, obd->obd_uuid.uuid);
 590
 591         class_decref(obd, "attach", obd);
 592         RETURN(0);
 593 }
 594 EXPORT_SYMBOL(class_detach);
 595
 596 /** Start shutting down the obd.  There may be in-progess ops when
 597  * this is called.  We tell them to start shutting down with a call
 598  * to class_disconnect_exports().
 599  */
 600 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 601 {
 602         int err = 0;
 603         char *flag;
 604         ENTRY;
 605
 606         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 607
 608         if (!obd->obd_set_up) {
 609                 CERROR("Device %d not setup\n", obd->obd_minor);
 610                 RETURN(-ENODEV);
 611         }
 612
 613         cfs_spin_lock(&obd->obd_dev_lock);
 614         if (obd->obd_stopping) {
 615                 cfs_spin_unlock(&obd->obd_dev_lock);
 616                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 617                 RETURN(-ENODEV);
 618         }
 619         /* Leave this on forever */
 620         obd->obd_stopping = 1;
 621
 622         /* wait for already-arrived-connections to finish. */
 623         while (obd->obd_conn_inprogress > 0) {
 624                 cfs_spin_unlock(&obd->obd_dev_lock);
 625
 626                 cfs_cond_resched();
 627
 628                 cfs_spin_lock(&obd->obd_dev_lock);
 629         }
 630        cfs_spin_unlock(&obd->obd_dev_lock);
 631
 632         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 633                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 634                         switch (*flag) {
 635                         case 'F':
 636                                 obd->obd_force = 1;
 637                                 break;
 638                         case 'A':
 639                                 LCONSOLE_WARN("Failing over %s\n",
 640                                               obd->obd_name);
 641                                 obd->obd_fail = 1;
 642                                 obd->obd_no_transno = 1;
 643                                 obd->obd_no_recov = 1;
 644                                 if (OBP(obd, iocontrol)) {
 645                                         obd_iocontrol(OBD_IOC_SYNC,
 646                                                       obd->obd_self_export,
 647                                                       0, NULL, NULL);
 648                                 }
 649                                 break;
 650                         default:
 651                                 CERROR("Unrecognised flag '%c'\n", *flag);
 652                         }
 653         }
 654
 655         LASSERT(obd->obd_self_export);
 656
 657         /* The three references that should be remaining are the
 658          * obd_self_export and the attach and setup references. */
 659         if (cfs_atomic_read(&obd->obd_refcount) > 3) {
 660                 /* refcounf - 3 might be the number of real exports
 661                    (excluding self export). But class_incref is called
 662                    by other things as well, so don't count on it. */
 663                 CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d\n",
 664                        obd->obd_name, cfs_atomic_read(&obd->obd_refcount) - 3);
 665                 dump_exports(obd, 0);
 666                 class_disconnect_exports(obd);
 667         }
 668
 669         /* Precleanup, we must make sure all exports get destroyed. */
 670         err = obd_precleanup(obd, OBD_CLEANUP_EXPORTS);
 671         if (err)
 672                 CERROR("Precleanup %s returned %d\n",
 673                        obd->obd_name, err);
 674
 675         /* destroy an uuid-export hash body */
 676         if (obd->obd_uuid_hash) {
 677                 cfs_hash_putref(obd->obd_uuid_hash);
 678                 obd->obd_uuid_hash = NULL;
 679         }
 680
 681         /* destroy a nid-export hash body */
 682         if (obd->obd_nid_hash) {
 683                 cfs_hash_putref(obd->obd_nid_hash);
 684                 obd->obd_nid_hash = NULL;
 685         }
 686
 687         /* destroy a nid-stats hash body */
 688         if (obd->obd_nid_stats_hash) {
 689                 cfs_hash_putref(obd->obd_nid_stats_hash);
 690                 obd->obd_nid_stats_hash = NULL;
 691         }
 692
 693         class_decref(obd, "setup", obd);
 694         obd->obd_set_up = 0;
 695
 696         RETURN(0);
 697 }
 698 EXPORT_SYMBOL(class_cleanup);
 699
 700 struct obd_device *class_incref(struct obd_device *obd,
 701                                 const char *scope, const void *source)
 702 {
 703         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 704         cfs_atomic_inc(&obd->obd_refcount);
 705         CDEBUG(D_INFO, "incref %s (%p) now %d\n", obd->obd_name, obd,
 706                cfs_atomic_read(&obd->obd_refcount));
 707
 708         return obd;
 709 }
 710 EXPORT_SYMBOL(class_incref);
 711
 712 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 713 {
 714         int err;
 715         int refs;
 716
 717         cfs_spin_lock(&obd->obd_dev_lock);
 718         cfs_atomic_dec(&obd->obd_refcount);
 719         refs = cfs_atomic_read(&obd->obd_refcount);
 720         cfs_spin_unlock(&obd->obd_dev_lock);
 721         lu_ref_del(&obd->obd_reference, scope, source);
 722
 723         CDEBUG(D_INFO, "Decref %s (%p) now %d\n", obd->obd_name, obd, refs);
 724
 725         if ((refs == 1) && obd->obd_stopping) {
 726                 /* All exports have been destroyed; there should
 727                    be no more in-progress ops by this point.*/
 728
 729                 cfs_spin_lock(&obd->obd_self_export->exp_lock);
 730                 obd->obd_self_export->exp_flags |= exp_flags_from_obd(obd);
 731                 cfs_spin_unlock(&obd->obd_self_export->exp_lock);
 732
 733                 /* note that we'll recurse into class_decref again */
 734                 class_unlink_export(obd->obd_self_export);
 735                 return;
 736         }
 737
 738         if (refs == 0) {
 739                 CDEBUG(D_CONFIG, "finishing cleanup of obd %s (%s)\n",
 740                        obd->obd_name, obd->obd_uuid.uuid);
 741                 LASSERT(!obd->obd_attached);
 742                 if (obd->obd_stopping) {
 743                         /* If we're not stopping, we were never set up */
 744                         err = obd_cleanup(obd);
 745                         if (err)
 746                                 CERROR("Cleanup %s returned %d\n",
 747                                        obd->obd_name, err);
 748                 }
 749                 if (OBP(obd, detach)) {
 750                         err = OBP(obd, detach)(obd);
 751                         if (err)
 752                                 CERROR("Detach returned %d\n", err);
 753                 }
 754                 class_release_dev(obd);
 755         }
 756 }
 757 EXPORT_SYMBOL(class_decref);
 758
 759 /** Add a failover nid location.
 760  * Client obd types contact server obd types using this nid list.
 761  */
 762 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 763 {
 764         struct obd_import *imp;
 765         struct obd_uuid uuid;
 766         int rc;
 767         ENTRY;
 768
 769         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 770             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 771                 CERROR("invalid conn_uuid\n");
 772                 RETURN(-EINVAL);
 773         }
 774         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 775             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
 776             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
 777                 CERROR("can't add connection on non-client dev\n");
 778                 RETURN(-EINVAL);
 779         }
 780
 781         imp = obd->u.cli.cl_import;
 782         if (!imp) {
 783                 CERROR("try to add conn on immature client dev\n");
 784                 RETURN(-EINVAL);
 785         }
 786
 787         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 788         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
 789
 790         RETURN(rc);
 791 }
 792
 793 /** Remove a failover nid location.
 794  */
 795 int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 796 {
 797         struct obd_import *imp;
 798         struct obd_uuid uuid;
 799         int rc;
 800         ENTRY;
 801
 802         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 803             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 804                 CERROR("invalid conn_uuid\n");
 805                 RETURN(-EINVAL);
 806         }
 807         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 808             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 809                 CERROR("can't del connection on non-client dev\n");
 810                 RETURN(-EINVAL);
 811         }
 812
 813         imp = obd->u.cli.cl_import;
 814         if (!imp) {
 815                 CERROR("try to del conn on immature client dev\n");
 816                 RETURN(-EINVAL);
 817         }
 818
 819         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 820         rc = obd_del_conn(imp, &uuid);
 821
 822         RETURN(rc);
 823 }
 824
 825 CFS_LIST_HEAD(lustre_profile_list);
 826
 827 struct lustre_profile *class_get_profile(const char * prof)
 828 {
 829         struct lustre_profile *lprof;
 830
 831         ENTRY;
 832         cfs_list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
 833                 if (!strcmp(lprof->lp_profile, prof)) {
 834                         RETURN(lprof);
 835                 }
 836         }
 837         RETURN(NULL);
 838 }
 839 EXPORT_SYMBOL(class_get_profile);
 840
 841 /** Create a named "profile".
 842  * This defines the mdc and osc names to use for a client.
 843  * This also is used to define the lov to be used by a mdt.
 844  */
 845 int class_add_profile(int proflen, char *prof, int osclen, char *osc,
 846                       int mdclen, char *mdc)
 847 {
 848         struct lustre_profile *lprof;
 849         int err = 0;
 850         ENTRY;
 851
 852         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
 853
 854         OBD_ALLOC(lprof, sizeof(*lprof));
 855         if (lprof == NULL)
 856                 RETURN(-ENOMEM);
 857         CFS_INIT_LIST_HEAD(&lprof->lp_list);
 858
 859         LASSERT(proflen == (strlen(prof) + 1));
 860         OBD_ALLOC(lprof->lp_profile, proflen);
 861         if (lprof->lp_profile == NULL)
 862                 GOTO(out, err = -ENOMEM);
 863         memcpy(lprof->lp_profile, prof, proflen);
 864
 865         LASSERT(osclen == (strlen(osc) + 1));
 866         OBD_ALLOC(lprof->lp_dt, osclen);
 867         if (lprof->lp_dt == NULL)
 868                 GOTO(out, err = -ENOMEM);
 869         memcpy(lprof->lp_dt, osc, osclen);
 870
 871         if (mdclen > 0) {
 872                 LASSERT(mdclen == (strlen(mdc) + 1));
 873                 OBD_ALLOC(lprof->lp_md, mdclen);
 874                 if (lprof->lp_md == NULL)
 875                         GOTO(out, err = -ENOMEM);
 876                 memcpy(lprof->lp_md, mdc, mdclen);
 877         }
 878
 879         cfs_list_add(&lprof->lp_list, &lustre_profile_list);
 880         RETURN(err);
 881
 882 out:
 883         if (lprof->lp_md)
 884                 OBD_FREE(lprof->lp_md, mdclen);
 885         if (lprof->lp_dt)
 886                 OBD_FREE(lprof->lp_dt, osclen);
 887         if (lprof->lp_profile)
 888                 OBD_FREE(lprof->lp_profile, proflen);
 889         OBD_FREE(lprof, sizeof(*lprof));
 890         RETURN(err);
 891 }
 892
 893 void class_del_profile(const char *prof)
 894 {
 895         struct lustre_profile *lprof;
 896         ENTRY;
 897
 898         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
 899
 900         lprof = class_get_profile(prof);
 901         if (lprof) {
 902                 cfs_list_del(&lprof->lp_list);
 903                 OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
 904                 OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
 905                 if (lprof->lp_md)
 906                         OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
 907                 OBD_FREE(lprof, sizeof *lprof);
 908         }
 909         EXIT;
 910 }
 911 EXPORT_SYMBOL(class_del_profile);
 912
 913 /* COMPAT_146 */
 914 void class_del_profiles(void)
 915 {
 916         struct lustre_profile *lprof, *n;
 917         ENTRY;
 918
 919         cfs_list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
 920                 cfs_list_del(&lprof->lp_list);
 921                 OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
 922                 OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
 923                 if (lprof->lp_md)
 924                         OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
 925                 OBD_FREE(lprof, sizeof *lprof);
 926         }
 927         EXIT;
 928 }
 929 EXPORT_SYMBOL(class_del_profiles);
 930
 931 static int class_set_global(char *ptr, int val, struct lustre_cfg *lcfg)
 932 {
 933         ENTRY;
 934         if (class_match_param(ptr, PARAM_AT_MIN, NULL) == 0)
 935                 at_min = val;
 936         else if (class_match_param(ptr, PARAM_AT_MAX, NULL) == 0)
 937                 at_max = val;
 938         else if (class_match_param(ptr, PARAM_AT_EXTRA, NULL) == 0)
 939                 at_extra = val;
 940         else if (class_match_param(ptr, PARAM_AT_EARLY_MARGIN, NULL) == 0)
 941                 at_early_margin = val;
 942         else if (class_match_param(ptr, PARAM_AT_HISTORY, NULL) == 0)
 943                 at_history = val;
 944         else if (class_match_param(ptr, PARAM_JOBID_VAR, NULL) == 0)
 945                 strlcpy(obd_jobid_var, lustre_cfg_string(lcfg, 2),
 946                         JOBSTATS_JOBID_VAR_MAX_LEN + 1);
 947         else
 948                 RETURN(-EINVAL);
 949
 950         CDEBUG(D_IOCTL, "global %s = %d\n", ptr, val);
 951         RETURN(0);
 952 }
 953
 954
 955 /* We can't call ll_process_config directly because it lives in a module that
 956    must be loaded after this one. */
 957 static int (*client_process_config)(struct lustre_cfg *lcfg) = NULL;
 958
 959 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg))
 960 {
 961         client_process_config = cpc;
 962 }
 963 EXPORT_SYMBOL(lustre_register_client_process_config);
 964
 965 /**
 966  * Rename the proc parameter in \a cfg with a new name \a new_name.
 967  *
 968  * \param cfg      config structure which contains the proc parameter
 969  * \param new_name new name of the proc parameter
 970  *
 971  * \retval valid-pointer    pointer to the newly-allocated config structure
 972  *                          which contains the renamed proc parameter
 973  * \retval ERR_PTR(-EINVAL) if \a cfg or \a new_name is NULL, or \a cfg does
 974  *                          not contain a proc parameter
 975  * \retval ERR_PTR(-ENOMEM) if memory allocation failure occurs
 976  */
 977 struct lustre_cfg *lustre_cfg_rename(struct lustre_cfg *cfg,
 978                                      const char *new_name)
 979 {
 980         struct lustre_cfg_bufs  *bufs = NULL;
 981         struct lustre_cfg       *new_cfg = NULL;
 982         char                    *param = NULL;
 983         char                    *new_param = NULL;
 984         char                    *value = NULL;
 985         int                      name_len = 0;
 986         int                      new_len = 0;
 987         ENTRY;
 988
 989         if (cfg == NULL || new_name == NULL)
 990                 RETURN(ERR_PTR(-EINVAL));
 991
 992         param = lustre_cfg_string(cfg, 1);
 993         if (param == NULL)
 994                 RETURN(ERR_PTR(-EINVAL));
 995
 996         value = strchr(param, '=');
 997         if (value == NULL)
 998                 name_len = strlen(param);
 999         else
1000                 name_len = value - param;
1001
1002         new_len = LUSTRE_CFG_BUFLEN(cfg, 1) + strlen(new_name) - name_len;
1003
1004         OBD_ALLOC(new_param, new_len);
1005         if (new_param == NULL)
1006                 RETURN(ERR_PTR(-ENOMEM));
1007
1008         strcpy(new_param, new_name);
1009         if (value != NULL)
1010                 strcat(new_param, value);
1011
1012         OBD_ALLOC_PTR(bufs);
1013         if (bufs == NULL) {
1014                 OBD_FREE(new_param, new_len);
1015                 RETURN(ERR_PTR(-ENOMEM));
1016         }
1017
1018         lustre_cfg_bufs_reset(bufs, NULL);
1019         lustre_cfg_bufs_init(bufs, cfg);
1020         lustre_cfg_bufs_set_string(bufs, 1, new_param);
1021
1022         new_cfg = lustre_cfg_new(cfg->lcfg_command, bufs);
1023
1024         OBD_FREE(new_param, new_len);
1025         OBD_FREE_PTR(bufs);
1026         if (new_cfg == NULL)
1027                 RETURN(ERR_PTR(-ENOMEM));
1028
1029         new_cfg->lcfg_num = cfg->lcfg_num;
1030         new_cfg->lcfg_flags = cfg->lcfg_flags;
1031         new_cfg->lcfg_nid = cfg->lcfg_nid;
1032         new_cfg->lcfg_nal = cfg->lcfg_nal;
1033
1034         RETURN(new_cfg);
1035 }
1036 EXPORT_SYMBOL(lustre_cfg_rename);
1037
1038 /** Process configuration commands given in lustre_cfg form.
1039  * These may come from direct calls (e.g. class_manual_cleanup)
1040  * or processing the config llog, or ioctl from lctl.
1041  */
1042 int class_process_config(struct lustre_cfg *lcfg)
1043 {
1044         struct obd_device *obd;
1045         int err;
1046
1047         LASSERT(lcfg && !IS_ERR(lcfg));
1048         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
1049
1050         /* Commands that don't need a device */
1051         switch(lcfg->lcfg_command) {
1052         case LCFG_ATTACH: {
1053                 err = class_attach(lcfg);
1054                 GOTO(out, err);
1055         }
1056         case LCFG_ADD_UUID: {
1057                 CDEBUG(D_IOCTL, "adding mapping from uuid %s to nid "LPX64
1058                        " (%s)\n", lustre_cfg_string(lcfg, 1),
1059                        lcfg->lcfg_nid, libcfs_nid2str(lcfg->lcfg_nid));
1060
1061                 err = class_add_uuid(lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid);
1062                 GOTO(out, err);
1063         }
1064         case LCFG_DEL_UUID: {
1065                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
1066                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) == 0)
1067                        ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
1068
1069                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
1070                 GOTO(out, err);
1071         }
1072         case LCFG_MOUNTOPT: {
1073                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
1074                        lustre_cfg_string(lcfg, 1),
1075                        lustre_cfg_string(lcfg, 2),
1076                        lustre_cfg_string(lcfg, 3));
1077                 /* set these mount options somewhere, so ll_fill_super
1078                  * can find them. */
1079                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
1080                                         lustre_cfg_string(lcfg, 1),
1081                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
1082                                         lustre_cfg_string(lcfg, 2),
1083                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
1084                                         lustre_cfg_string(lcfg, 3));
1085                 GOTO(out, err);
1086         }
1087         case LCFG_DEL_MOUNTOPT: {
1088                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
1089                        lustre_cfg_string(lcfg, 1));
1090                 class_del_profile(lustre_cfg_string(lcfg, 1));
1091                 GOTO(out, err = 0);
1092         }
1093         case LCFG_SET_TIMEOUT: {
1094                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
1095                        obd_timeout, lcfg->lcfg_num);
1096                 obd_timeout = max(lcfg->lcfg_num, 1U);
1097                 obd_timeout_set = 1;
1098                 GOTO(out, err = 0);
1099         }
1100         case LCFG_SET_LDLM_TIMEOUT: {
1101                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
1102                        ldlm_timeout, lcfg->lcfg_num);
1103                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
1104                 if (ldlm_timeout >= obd_timeout)
1105                         ldlm_timeout = max(obd_timeout / 3, 1U);
1106                 ldlm_timeout_set = 1;
1107                 GOTO(out, err = 0);
1108         }
1109         case LCFG_SET_UPCALL: {
1110                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
1111                 /* COMPAT_146 Don't fail on old configs */
1112                 GOTO(out, err = 0);
1113         }
1114         case LCFG_MARKER: {
1115                 struct cfg_marker *marker;
1116                 marker = lustre_cfg_buf(lcfg, 1);
1117                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
1118                        marker->cm_flags, marker->cm_tgtname, marker->cm_comment);
1119                 GOTO(out, err = 0);
1120         }
1121         case LCFG_PARAM: {
1122                 char *tmp;
1123                 /* llite has no obd */
1124                 if ((class_match_param(lustre_cfg_string(lcfg, 1),
1125                                        PARAM_LLITE, 0) == 0) &&
1126                     client_process_config) {
1127                         err = (*client_process_config)(lcfg);
1128                         GOTO(out, err);
1129                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1130                                               PARAM_SYS, &tmp) == 0)) {
1131                         /* Global param settings */
1132                         err = class_set_global(tmp, lcfg->lcfg_num, lcfg);
1133                         /* Note that since LCFG_PARAM is LCFG_REQUIRED, new
1134                            unknown globals would cause config to fail */
1135                         if (err)
1136                                 CWARN("Ignoring unknown param %s\n", tmp);
1137                         GOTO(out, 0);
1138                 }
1139
1140                 /* Fall through */
1141                 break;
1142         }
1143         }
1144
1145         /* Commands that require a device */
1146         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1147         if (obd == NULL) {
1148                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
1149                         CERROR("this lcfg command requires a device name\n");
1150                 else
1151                         CERROR("no device for: %s\n",
1152                                lustre_cfg_string(lcfg, 0));
1153
1154                 GOTO(out, err = -EINVAL);
1155         }
1156
1157         switch(lcfg->lcfg_command) {
1158         case LCFG_SETUP: {
1159                 err = class_setup(obd, lcfg);
1160                 GOTO(out, err);
1161         }
1162         case LCFG_DETACH: {
1163                 err = class_detach(obd, lcfg);
1164                 GOTO(out, err = 0);
1165         }
1166         case LCFG_CLEANUP: {
1167                 err = class_cleanup(obd, lcfg);
1168                 GOTO(out, err = 0);
1169         }
1170         case LCFG_ADD_CONN: {
1171                 err = class_add_conn(obd, lcfg);
1172                 GOTO(out, err = 0);
1173         }
1174         case LCFG_DEL_CONN: {
1175                 err = class_del_conn(obd, lcfg);
1176                 GOTO(out, err = 0);
1177         }
1178         case LCFG_POOL_NEW: {
1179                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
1180                 GOTO(out, err = 0);
1181                 break;
1182         }
1183         case LCFG_POOL_ADD: {
1184                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
1185                                    lustre_cfg_string(lcfg, 3));
1186                 GOTO(out, err = 0);
1187                 break;
1188         }
1189         case LCFG_POOL_REM: {
1190                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
1191                                    lustre_cfg_string(lcfg, 3));
1192                 GOTO(out, err = 0);
1193                 break;
1194         }
1195         case LCFG_POOL_DEL: {
1196                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
1197                 GOTO(out, err = 0);
1198                 break;
1199         }
1200         default: {
1201                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1202                 GOTO(out, err);
1203
1204         }
1205         }
1206 out:
1207         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
1208                 CWARN("Ignoring error %d on optional command %#x\n", err,
1209                       lcfg->lcfg_command);
1210                 err = 0;
1211         }
1212         return err;
1213 }
1214 EXPORT_SYMBOL(class_process_config);
1215
1216 int class_process_proc_param(char *prefix, struct lprocfs_vars *lvars,
1217                              struct lustre_cfg *lcfg, void *data)
1218 {
1219 #ifdef __KERNEL__
1220         struct lprocfs_vars *var;
1221         char *key, *sval;
1222         int i, keylen, vallen;
1223         int matched = 0, j = 0;
1224         int rc = 0;
1225         int skip = 0;
1226         ENTRY;
1227
1228         if (lcfg->lcfg_command != LCFG_PARAM) {
1229                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1230                 RETURN(-EINVAL);
1231         }
1232
1233         /* e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1234            or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1235            or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36 */
1236         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1237                 key = lustre_cfg_buf(lcfg, i);
1238                 /* Strip off prefix */
1239                 class_match_param(key, prefix, &key);
1240                 sval = strchr(key, '=');
1241                 if (!sval || (*(sval + 1) == 0)) {
1242                         CERROR("Can't parse param %s (missing '=')\n", key);
1243                         /* rc = -EINVAL;        continue parsing other params */
1244                         continue;
1245                 }
1246                 keylen = sval - key;
1247                 sval++;
1248                 vallen = strlen(sval);
1249                 matched = 0;
1250                 j = 0;
1251                 /* Search proc entries */
1252                 while (lvars[j].name) {
1253                         var = &lvars[j];
1254                         if (class_match_param(key, (char *)var->name, 0) == 0 &&
1255                             keylen == strlen(var->name)) {
1256                                 matched++;
1257                                 rc = -EROFS;
1258                                 if (var->write_fptr) {
1259                                         mm_segment_t oldfs;
1260                                         oldfs = get_fs();
1261                                         set_fs(KERNEL_DS);
1262                                         rc = (var->write_fptr)(NULL, sval,
1263                                                                vallen, data);
1264                                         set_fs(oldfs);
1265                                 }
1266                                 break;
1267                         }
1268                         j++;
1269                 }
1270                 if (!matched) {
1271                         /* If the prefix doesn't match, return error so we
1272                            can pass it down the stack */
1273                         if (strnchr(key, keylen, '.'))
1274                             RETURN(-ENOSYS);
1275                         CERROR("%s: unknown param %s\n",
1276                                (char *)lustre_cfg_string(lcfg, 0), key);
1277                         /* rc = -EINVAL;        continue parsing other params */
1278                         skip++;
1279                 } else if (rc < 0) {
1280                         CERROR("writing proc entry %s err %d\n",
1281                                var->name, rc);
1282                         rc = 0;
1283                 } else {
1284                         CDEBUG(D_CONFIG, "%s.%.*s: set parameter %.*s=%s\n",
1285                                       lustre_cfg_string(lcfg, 0),
1286                                       (int)strlen(prefix) - 1, prefix,
1287                                       (int)(sval - key - 1), key, sval);
1288                 }
1289         }
1290
1291         if (rc > 0)
1292                 rc = 0;
1293         if (!rc && skip)
1294                 rc = skip;
1295         RETURN(rc);
1296 #else
1297         CDEBUG(D_CONFIG, "liblustre can't process params.\n");
1298         /* Don't throw config error */
1299         RETURN(0);
1300 #endif
1301 }
1302 EXPORT_SYMBOL(class_process_proc_param);
1303
1304 #ifdef __KERNEL__
1305 extern int lustre_check_exclusion(struct super_block *sb, char *svname);
1306 #else
1307 #define lustre_check_exclusion(a,b)  0
1308 #endif
1309
1310 /** Parse a configuration llog, doing various manipulations on them
1311  * for various reasons, (modifications for compatibility, skip obsolete
1312  * records, change uuids, etc), then class_process_config() resulting
1313  * net records.
1314  */
1315 static int class_config_llog_handler(const struct lu_env *env,
1316                                      struct llog_handle *handle,
1317                                      struct llog_rec_hdr *rec, void *data)
1318 {
1319         struct config_llog_instance *clli = data;
1320         int cfg_len = rec->lrh_len;
1321         char *cfg_buf = (char*) (rec + 1);
1322         int rc = 0;
1323         ENTRY;
1324
1325         //class_config_dump_handler(handle, rec, data);
1326
1327         switch (rec->lrh_type) {
1328         case OBD_CFG_REC: {
1329                 struct lustre_cfg *lcfg, *lcfg_new;
1330                 struct lustre_cfg_bufs bufs;
1331                 char *inst_name = NULL;
1332                 int inst_len = 0;
1333                 int inst = 0, swab = 0;
1334
1335                 lcfg = (struct lustre_cfg *)cfg_buf;
1336                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1337                         lustre_swab_lustre_cfg(lcfg);
1338                         swab = 1;
1339                 }
1340
1341                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1342                 if (rc)
1343                         GOTO(out, rc);
1344
1345                 /* Figure out config state info */
1346                 if (lcfg->lcfg_command == LCFG_MARKER) {
1347                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1348                         lustre_swab_cfg_marker(marker, swab,
1349                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1350                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1351                                clli->cfg_flags, marker->cm_flags);
1352                         if (marker->cm_flags & CM_START) {
1353                                 /* all previous flags off */
1354                                 clli->cfg_flags = CFG_F_MARKER;
1355                                 if (marker->cm_flags & CM_SKIP) {
1356                                         clli->cfg_flags |= CFG_F_SKIP;
1357                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1358                                                marker->cm_step);
1359                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1360                                            (clli->cfg_sb &&
1361                                             lustre_check_exclusion(clli->cfg_sb,
1362                                                          marker->cm_tgtname))) {
1363                                         clli->cfg_flags |= CFG_F_EXCLUDE;
1364                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1365                                                marker->cm_step);
1366                                 }
1367                         } else if (marker->cm_flags & CM_END) {
1368                                 clli->cfg_flags = 0;
1369                         }
1370                 }
1371                 /* A config command without a start marker before it is
1372                    illegal (post 146) */
1373                 if (!(clli->cfg_flags & CFG_F_COMPAT146) &&
1374                     !(clli->cfg_flags & CFG_F_MARKER) &&
1375                     (lcfg->lcfg_command != LCFG_MARKER)) {
1376                         CWARN("Config not inside markers, ignoring! "
1377                               "(inst: %p, uuid: %s, flags: %#x)\n",
1378                               clli->cfg_instance,
1379                               clli->cfg_uuid.uuid, clli->cfg_flags);
1380                         clli->cfg_flags |= CFG_F_SKIP;
1381                 }
1382                 if (clli->cfg_flags & CFG_F_SKIP) {
1383                         CDEBUG(D_CONFIG, "skipping %#x\n",
1384                                clli->cfg_flags);
1385                         rc = 0;
1386                         /* No processing! */
1387                         break;
1388                 }
1389
1390                 /*
1391                  * For interoperability between 1.8 and 2.0,
1392                  * rename "mds" obd device type to "mdt".
1393                  */
1394                 {
1395                         char *typename = lustre_cfg_string(lcfg, 1);
1396                         char *index = lustre_cfg_string(lcfg, 2);
1397
1398                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1399                              strcmp(typename, "mds") == 0)) {
1400                                 CWARN("For 1.8 interoperability, rename obd "
1401                                        "type from mds to mdt\n");
1402                                 typename[2] = 't';
1403                         }
1404                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1405                              strcmp(index, "type") == 0)) {
1406                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1407                                        "set this index to '0'\n");
1408                                 index[0] = '0';
1409                                 index[1] = 0;
1410                         }
1411                 }
1412
1413                 if ((clli->cfg_flags & CFG_F_EXCLUDE) &&
1414                     (lcfg->lcfg_command == LCFG_LOV_ADD_OBD))
1415                         /* Add inactive instead */
1416                         lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1417
1418                 lustre_cfg_bufs_init(&bufs, lcfg);
1419
1420                 if (clli && clli->cfg_instance &&
1421                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0){
1422                         inst = 1;
1423                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1424                                    sizeof(clli->cfg_instance) * 2 + 4;
1425                         OBD_ALLOC(inst_name, inst_len);
1426                         if (inst_name == NULL)
1427                                 GOTO(out, rc = -ENOMEM);
1428                         sprintf(inst_name, "%s-%p",
1429                                 lustre_cfg_string(lcfg, 0),
1430                                 clli->cfg_instance);
1431                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1432                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1433                                lcfg->lcfg_command, inst_name);
1434                 }
1435
1436                 /* we override the llog's uuid for clients, to insure they
1437                 are unique */
1438                 if (clli && clli->cfg_instance != NULL &&
1439                     lcfg->lcfg_command == LCFG_ATTACH) {
1440                         lustre_cfg_bufs_set_string(&bufs, 2,
1441                                                    clli->cfg_uuid.uuid);
1442                 }
1443                 /*
1444                  * sptlrpc config record, we expect 2 data segments:
1445                  *  [0]: fs_name/target_name,
1446                  *  [1]: rule string
1447                  * moving them to index [1] and [2], and insert MGC's
1448                  * obdname at index [0].
1449                  */
1450                 if (clli && clli->cfg_instance == NULL &&
1451                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1452                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1453                                             bufs.lcfg_buflen[1]);
1454                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1455                                             bufs.lcfg_buflen[0]);
1456                         lustre_cfg_bufs_set_string(&bufs, 0,
1457                                                    clli->cfg_obdname);
1458                 }
1459
1460                 lcfg_new = lustre_cfg_new(lcfg->lcfg_command, &bufs);
1461
1462                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1463                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1464
1465                 /* XXX Hack to try to remain binary compatible with
1466                  * pre-newconfig logs */
1467                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1468                     (lcfg->lcfg_nid >> 32) == 0) {
1469                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1470
1471                         lcfg_new->lcfg_nid =
1472                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1473                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
1474                               lcfg->lcfg_nal, addr,
1475                               libcfs_nid2str(lcfg_new->lcfg_nid));
1476                 } else {
1477                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
1478                 }
1479
1480                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
1481
1482                 rc = class_process_config(lcfg_new);
1483                 lustre_cfg_free(lcfg_new);
1484
1485                 if (inst)
1486                         OBD_FREE(inst_name, inst_len);
1487                 break;
1488         }
1489         default:
1490                 CERROR("Unknown llog record type %#x encountered\n",
1491                        rec->lrh_type);
1492                 break;
1493         }
1494 out:
1495         if (rc) {
1496                 CERROR("Err %d on cfg command:\n", rc);
1497                 class_config_dump_handler(NULL, handle, rec, data);
1498         }
1499         RETURN(rc);
1500 }
1501
1502 int class_config_parse_llog(struct llog_ctxt *ctxt, char *name,
1503                             struct config_llog_instance *cfg)
1504 {
1505         struct llog_process_cat_data cd = {0, 0};
1506         struct llog_handle *llh;
1507         int rc, rc2;
1508         ENTRY;
1509
1510         CDEBUG(D_INFO, "looking up llog %s\n", name);
1511         rc = llog_create(NULL, ctxt, &llh, NULL, name);
1512         if (rc)
1513                 RETURN(rc);
1514
1515         rc = llog_init_handle(NULL, llh, LLOG_F_IS_PLAIN, NULL);
1516         if (rc)
1517                 GOTO(parse_out, rc);
1518
1519         /* continue processing from where we last stopped to end-of-log */
1520         if (cfg)
1521                 cd.lpcd_first_idx = cfg->cfg_last_idx;
1522         cd.lpcd_last_idx = 0;
1523
1524         rc = llog_process(NULL, llh, class_config_llog_handler, cfg, &cd);
1525
1526         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
1527                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
1528
1529         if (cfg)
1530                 cfg->cfg_last_idx = cd.lpcd_last_idx;
1531
1532 parse_out:
1533         rc2 = llog_close(NULL, llh);
1534         if (rc == 0)
1535                 rc = rc2;
1536
1537         RETURN(rc);
1538 }
1539 EXPORT_SYMBOL(class_config_parse_llog);
1540
1541 int class_config_dump_handler(const struct lu_env *env,
1542                               struct llog_handle *handle,
1543                               struct llog_rec_hdr *rec, void *data)
1544 {
1545         int cfg_len = rec->lrh_len;
1546         char *cfg_buf = (char*) (rec + 1);
1547         char *outstr, *ptr, *end;
1548         int rc = 0;
1549         ENTRY;
1550
1551         OBD_ALLOC(outstr, 256);
1552         end = outstr + 256;
1553         ptr = outstr;
1554         if (!outstr) {
1555                 RETURN(-ENOMEM);
1556         }
1557         if (rec->lrh_type == OBD_CFG_REC) {
1558                 struct lustre_cfg *lcfg;
1559                 int i;
1560
1561                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1562                 if (rc)
1563                         GOTO(out, rc);
1564                 lcfg = (struct lustre_cfg *)cfg_buf;
1565
1566                 ptr += snprintf(ptr, end-ptr, "cmd=%05x ",
1567                                 lcfg->lcfg_command);
1568                 if (lcfg->lcfg_flags) {
1569                         ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
1570                                         lcfg->lcfg_flags);
1571                 }
1572                 if (lcfg->lcfg_num) {
1573                         ptr += snprintf(ptr, end-ptr, "num=%#08x ",
1574                                         lcfg->lcfg_num);
1575                 }
1576                 if (lcfg->lcfg_nid) {
1577                         ptr += snprintf(ptr, end-ptr, "nid=%s("LPX64")\n     ",
1578                                         libcfs_nid2str(lcfg->lcfg_nid),
1579                                         lcfg->lcfg_nid);
1580                 }
1581                 if (lcfg->lcfg_command == LCFG_MARKER) {
1582                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1583                         ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
1584                                         marker->cm_step, marker->cm_flags,
1585                                         marker->cm_tgtname, marker->cm_comment);
1586                 } else {
1587                         for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
1588                                 ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
1589                                                 lustre_cfg_string(lcfg, i));
1590                         }
1591                 }
1592                 LCONSOLE(D_WARNING, "   %s\n", outstr);
1593         } else {
1594                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
1595                 rc = -EINVAL;
1596         }
1597 out:
1598         OBD_FREE(outstr, 256);
1599         RETURN(rc);
1600 }
1601
1602 int class_config_dump_llog(struct llog_ctxt *ctxt, char *name,
1603                            struct config_llog_instance *cfg)
1604 {
1605         struct llog_handle *llh;
1606         int rc, rc2;
1607         ENTRY;
1608
1609         LCONSOLE_INFO("Dumping config log %s\n", name);
1610
1611         rc = llog_create(NULL, ctxt, &llh, NULL, name);
1612         if (rc)
1613                 RETURN(rc);
1614
1615         rc = llog_init_handle(NULL, llh, LLOG_F_IS_PLAIN, NULL);
1616         if (rc)
1617                 GOTO(parse_out, rc);
1618
1619         rc = llog_process(NULL, llh, class_config_dump_handler, cfg, NULL);
1620 parse_out:
1621         rc2 = llog_close(NULL, llh);
1622         if (rc == 0)
1623                 rc = rc2;
1624
1625         LCONSOLE_INFO("End config log %s\n", name);
1626         RETURN(rc);
1627
1628 }
1629 EXPORT_SYMBOL(class_config_dump_llog);
1630
1631 /** Call class_cleanup and class_detach.
1632  * "Manual" only in the sense that we're faking lcfg commands.
1633  */
1634 int class_manual_cleanup(struct obd_device *obd)
1635 {
1636         char                    flags[3] = "";
1637         struct lustre_cfg      *lcfg;
1638         struct lustre_cfg_bufs  bufs;
1639         int                     rc;
1640         ENTRY;
1641
1642         if (!obd) {
1643                 CERROR("empty cleanup\n");
1644                 RETURN(-EALREADY);
1645         }
1646
1647         if (obd->obd_force)
1648                 strcat(flags, "F");
1649         if (obd->obd_fail)
1650                 strcat(flags, "A");
1651
1652         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
1653                obd->obd_name, flags);
1654
1655         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
1656         lustre_cfg_bufs_set_string(&bufs, 1, flags);
1657         lcfg = lustre_cfg_new(LCFG_CLEANUP, &bufs);
1658         if (!lcfg)
1659                 RETURN(-ENOMEM);
1660
1661         rc = class_process_config(lcfg);
1662         if (rc) {
1663                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
1664                 GOTO(out, rc);
1665         }
1666
1667         /* the lcfg is almost the same for both ops */
1668         lcfg->lcfg_command = LCFG_DETACH;
1669         rc = class_process_config(lcfg);
1670         if (rc)
1671                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
1672 out:
1673         lustre_cfg_free(lcfg);
1674         RETURN(rc);
1675 }
1676 EXPORT_SYMBOL(class_manual_cleanup);
1677
1678 /*
1679  * uuid<->export lustre hash operations
1680  */
1681
1682 static unsigned
1683 uuid_hash(cfs_hash_t *hs, const void *key, unsigned mask)
1684 {
1685         return cfs_hash_djb2_hash(((struct obd_uuid *)key)->uuid,
1686                                   sizeof(((struct obd_uuid *)key)->uuid), mask);
1687 }
1688
1689 static void *
1690 uuid_key(cfs_hlist_node_t *hnode)
1691 {
1692         struct obd_export *exp;
1693
1694         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1695
1696         return &exp->exp_client_uuid;
1697 }
1698
1699 /*
1700  * NOTE: It is impossible to find an export that is in failed
1701  *       state with this function
1702  */
1703 static int
1704 uuid_keycmp(const void *key, cfs_hlist_node_t *hnode)
1705 {
1706         struct obd_export *exp;
1707
1708         LASSERT(key);
1709         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1710
1711         return obd_uuid_equals(key, &exp->exp_client_uuid) &&
1712                !exp->exp_failed;
1713 }
1714
1715 static void *
1716 uuid_export_object(cfs_hlist_node_t *hnode)
1717 {
1718         return cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1719 }
1720
1721 static void
1722 uuid_export_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1723 {
1724         struct obd_export *exp;
1725
1726         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1727         class_export_get(exp);
1728 }
1729
1730 static void
1731 uuid_export_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1732 {
1733         struct obd_export *exp;
1734
1735         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1736         class_export_put(exp);
1737 }
1738
1739 static cfs_hash_ops_t uuid_hash_ops = {
1740         .hs_hash        = uuid_hash,
1741         .hs_key         = uuid_key,
1742         .hs_keycmp      = uuid_keycmp,
1743         .hs_object      = uuid_export_object,
1744         .hs_get         = uuid_export_get,
1745         .hs_put_locked  = uuid_export_put_locked,
1746 };
1747
1748
1749 /*
1750  * nid<->export hash operations
1751  */
1752
1753 static unsigned
1754 nid_hash(cfs_hash_t *hs, const void *key, unsigned mask)
1755 {
1756         return cfs_hash_djb2_hash(key, sizeof(lnet_nid_t), mask);
1757 }
1758
1759 static void *
1760 nid_key(cfs_hlist_node_t *hnode)
1761 {
1762         struct obd_export *exp;
1763
1764         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1765
1766         RETURN(&exp->exp_connection->c_peer.nid);
1767 }
1768
1769 /*
1770  * NOTE: It is impossible to find an export that is in failed
1771  *       state with this function
1772  */
1773 static int
1774 nid_kepcmp(const void *key, cfs_hlist_node_t *hnode)
1775 {
1776         struct obd_export *exp;
1777
1778         LASSERT(key);
1779         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1780
1781         RETURN(exp->exp_connection->c_peer.nid == *(lnet_nid_t *)key &&
1782                !exp->exp_failed);
1783 }
1784
1785 static void *
1786 nid_export_object(cfs_hlist_node_t *hnode)
1787 {
1788         return cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1789 }
1790
1791 static void
1792 nid_export_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1793 {
1794         struct obd_export *exp;
1795
1796         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1797         class_export_get(exp);
1798 }
1799
1800 static void
1801 nid_export_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1802 {
1803         struct obd_export *exp;
1804
1805         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1806         class_export_put(exp);
1807 }
1808
1809 static cfs_hash_ops_t nid_hash_ops = {
1810         .hs_hash        = nid_hash,
1811         .hs_key         = nid_key,
1812         .hs_keycmp      = nid_kepcmp,
1813         .hs_object      = nid_export_object,
1814         .hs_get         = nid_export_get,
1815         .hs_put_locked  = nid_export_put_locked,
1816 };
1817
1818
1819 /*
1820  * nid<->nidstats hash operations
1821  */
1822
1823 static void *
1824 nidstats_key(cfs_hlist_node_t *hnode)
1825 {
1826         struct nid_stat *ns;
1827
1828         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1829
1830         return &ns->nid;
1831 }
1832
1833 static int
1834 nidstats_keycmp(const void *key, cfs_hlist_node_t *hnode)
1835 {
1836         return *(lnet_nid_t *)nidstats_key(hnode) == *(lnet_nid_t *)key;
1837 }
1838
1839 static void *
1840 nidstats_object(cfs_hlist_node_t *hnode)
1841 {
1842         return cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1843 }
1844
1845 static void
1846 nidstats_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1847 {
1848         struct nid_stat *ns;
1849
1850         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1851         nidstat_getref(ns);
1852 }
1853
1854 static void
1855 nidstats_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1856 {
1857         struct nid_stat *ns;
1858
1859         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1860         nidstat_putref(ns);
1861 }
1862
1863 static cfs_hash_ops_t nid_stat_hash_ops = {
1864         .hs_hash        = nid_hash,
1865         .hs_key         = nidstats_key,
1866         .hs_keycmp      = nidstats_keycmp,
1867         .hs_object      = nidstats_object,
1868         .hs_get         = nidstats_get,
1869         .hs_put_locked  = nidstats_put_locked,
1870 };