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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/obdclass/obd_config.c
  32  *
  33  * Config API
  34  */
  35
  36 #define DEBUG_SUBSYSTEM S_CLASS
  37
  38 #include <linux/kobject.h>
  39 #include <linux/string.h>
  40
  41 #include <llog_swab.h>
  42 #include <lprocfs_status.h>
  43 #include <lustre_disk.h>
  44 #include <uapi/linux/lustre/lustre_ioctl.h>
  45 #include <lustre_log.h>
  46 #include <uapi/linux/lustre/lustre_param.h>
  47 #include <obd_class.h>
  48
  49 #include "llog_internal.h"
  50
  51 #ifdef HAVE_SERVER_SUPPORT
  52 static struct cfs_hash_ops nid_stat_hash_ops;
  53 static struct cfs_hash_ops gen_hash_ops;
  54 #endif /* HAVE_SERVER_SUPPORT */
  55
  56 /*
  57  * uuid<->export lustre hash operations
  58  */
  59 /*
  60  * NOTE: It is impossible to find an export that is in failed
  61  *      state with this function
  62  */
  63 static int
  64 uuid_keycmp(struct rhashtable_compare_arg *arg, const void *obj)
  65 {
  66         const struct obd_uuid *uuid = arg->key;
  67         const struct obd_export *exp = obj;
  68
  69         if (obd_uuid_equals(uuid, &exp->exp_client_uuid) &&
  70             !exp->exp_failed)
  71                 return 0;
  72         return -ESRCH;
  73 }
  74
  75 static void
  76 obd_export_exit(void *vexport, void *data)
  77 {
  78         struct obd_export *exp = vexport;
  79
  80         class_export_put(exp);
  81 }
  82
  83 static const struct rhashtable_params uuid_hash_params = {
  84         .key_len        = sizeof(struct obd_uuid),
  85         .key_offset     = offsetof(struct obd_export, exp_client_uuid),
  86         .head_offset    = offsetof(struct obd_export, exp_uuid_hash),
  87         .obj_cmpfn      = uuid_keycmp,
  88         .max_size       = MAX_OBD_DEVICES,
  89         .automatic_shrinking = true,
  90 };
  91
  92 int obd_uuid_add(struct obd_device *obd, struct obd_export *export)
  93 {
  94         int rc;
  95
  96         class_export_get(export);
  97         rcu_read_lock();
  98         rc = rhashtable_lookup_insert_fast(&obd->obd_uuid_hash,
  99                                            &export->exp_uuid_hash,
 100                                            uuid_hash_params);
 101         if (rc) {
 102                 class_export_put(export);
 103                 if (rc != -EEXIST) {
 104                         /* map obscure error codes to -ENOMEM */
 105                         rc = -ENOMEM;
 106                 } else {
 107                         rc = -EALREADY;
 108                 }
 109         }
 110         rcu_read_unlock();
 111
 112         return rc;
 113 }
 114 EXPORT_SYMBOL(obd_uuid_add);
 115
 116 void obd_uuid_del(struct obd_device *obd, struct obd_export *export)
 117 {
 118         int rc;
 119
 120         rcu_read_lock();
 121         rc = rhashtable_remove_fast(&obd->obd_uuid_hash,
 122                                     &export->exp_uuid_hash,
 123                                     uuid_hash_params);
 124         if (!rc)
 125                 class_export_put(export);
 126         rcu_read_unlock();
 127 }
 128 EXPORT_SYMBOL(obd_uuid_del);
 129
 130 #ifdef HAVE_SERVER_SUPPORT
 131 /* obd_uuid_lookup() is used only server side by target_handle_connect(),
 132  * mdt_hsm_agent_send(), and obd_export_evict_by_uuid().
 133  */
 134 struct obd_export *obd_uuid_lookup(struct obd_device *obd,
 135                                    struct obd_uuid *uuid)
 136 {
 137         struct obd_export *export = NULL;
 138
 139         rcu_read_lock();
 140         export = rhashtable_lookup_fast(&obd->obd_uuid_hash, uuid,
 141                                         uuid_hash_params);
 142         if (export && !refcount_inc_not_zero(&export->exp_handle.h_ref))
 143                 export = NULL;
 144         rcu_read_unlock();
 145
 146         return export;
 147 }
 148 EXPORT_SYMBOL(obd_uuid_lookup);
 149
 150 /*
 151  * nid<->export hash operations
 152  */
 153 static u32 nid_keyhash(const void *data, u32 key_len, u32 seed)
 154 {
 155         const struct obd_export *exp = data;
 156         void *key;
 157
 158         if (!exp->exp_connection)
 159                 return 0;
 160
 161         key = &exp->exp_connection->c_peer.nid;
 162         return jhash2(key, key_len / sizeof(u32), seed);
 163 }
 164
 165 /*
 166  * NOTE: It is impossible to find an export that is in failed
 167  *       state with this function
 168  */
 169 static int
 170 nid_keycmp(struct rhashtable_compare_arg *arg, const void *obj)
 171 {
 172         const struct lnet_nid *nid = arg->key;
 173         const struct obd_export *exp = obj;
 174
 175         if (nid_same(&exp->exp_connection->c_peer.nid, nid))
 176                 return 0;
 177
 178         return -ESRCH;
 179 }
 180
 181 static void
 182 nid_export_exit(void *vexport, void *data)
 183 {
 184         struct obd_export *exp = vexport;
 185
 186         class_export_put(exp);
 187 }
 188
 189 static const struct rhashtable_params nid_hash_params = {
 190         .key_len                = sizeof(struct lnet_nid),
 191         .head_offset            = offsetof(struct obd_export, exp_nid_hash),
 192         .obj_hashfn             = nid_keyhash,
 193         .obj_cmpfn              = nid_keycmp,
 194         .automatic_shrinking    = true,
 195 };
 196
 197 int obd_nid_add(struct obd_device *obd, struct obd_export *exp)
 198 {
 199         int rc;
 200
 201         if (exp == exp->exp_obd->obd_self_export || exp->exp_hashed)
 202                 return 0;
 203
 204         class_export_get(exp);
 205         rc = rhltable_insert_key(&obd->obd_nid_hash,
 206                                  &exp->exp_connection->c_peer.nid,
 207                                  &exp->exp_nid_hash,
 208                                  nid_hash_params);
 209         if (rc) {
 210                 class_export_put(exp);
 211                 /* map obscure error codes to -ENOMEM */
 212                 rc = -ENOMEM;
 213         } else {
 214                 exp->exp_hashed = 1;
 215         }
 216         return rc;
 217 }
 218 EXPORT_SYMBOL(obd_nid_add);
 219
 220 void obd_nid_del(struct obd_device *obd, struct obd_export *exp)
 221 {
 222         int rc;
 223
 224         if (exp == exp->exp_obd->obd_self_export || !exp->exp_hashed)
 225                 return;
 226
 227         rc = rhltable_remove(&obd->obd_nid_hash, &exp->exp_nid_hash,
 228                              nid_hash_params);
 229         if (rc == 0) {
 230                 class_export_put(exp);
 231                 exp->exp_hashed = 0;
 232         }
 233 }
 234 EXPORT_SYMBOL(obd_nid_del);
 235
 236 int obd_nid_export_for_each(struct obd_device *obd, struct lnet_nid *nid,
 237                             int cb(struct obd_export *exp, void *data),
 238                             void *data)
 239 {
 240         struct rhlist_head *exports, *tmp;
 241         struct obd_export *exp;
 242         int ret = 0;
 243
 244         rcu_read_lock();
 245         exports = rhltable_lookup(&obd->obd_nid_hash, nid, nid_hash_params);
 246         if (!exports) {
 247                 ret = -ENODEV;
 248                 goto out_unlock;
 249         }
 250
 251         rhl_for_each_entry_rcu(exp, tmp, exports, exp_nid_hash) {
 252                 if (!exp->exp_failed && cb(exp, data))
 253                         ret++;
 254         }
 255
 256 out_unlock:
 257         rcu_read_unlock();
 258         return ret;
 259 }
 260 EXPORT_SYMBOL(obd_nid_export_for_each);
 261 #endif /* HAVE_SERVER_SUPPORT */
 262
 263 /*********** string parsing utils *********/
 264
 265 /* returns 0 if we find this key in the buffer, else 1 */
 266 int class_find_param(char *buf, char *key, char **valp)
 267 {
 268         char *ptr;
 269
 270         if (!buf)
 271                 return 1;
 272
 273         ptr = strstr(buf, key);
 274         if (!ptr)
 275                 return 1;
 276
 277         if (valp)
 278                 *valp = ptr + strlen(key);
 279
 280         return 0;
 281 }
 282 EXPORT_SYMBOL(class_find_param);
 283
 284 /**
 285  * Check whether the proc parameter \a param is an old parameter or not from
 286  * the array \a ptr which contains the mapping from old parameters to new ones.
 287  * If it's an old one, then return the pointer to the cfg_interop_param struc-
 288  * ture which contains both the old and new parameters.
 289  *
 290  * \param param                 proc parameter
 291  * \param ptr                   an array which contains the mapping from
 292  *                              old parameters to new ones
 293  *
 294  * \retval valid-pointer        pointer to the cfg_interop_param structure
 295  *                              which contains the old and new parameters
 296  * \retval NULL                 \a param or \a ptr is NULL,
 297  *                              or \a param is not an old parameter
 298  */
 299 struct cfg_interop_param *class_find_old_param(const char *param,
 300                                                struct cfg_interop_param *ptr)
 301 {
 302         char *value = NULL;
 303         int   name_len = 0;
 304
 305         if (!param || !ptr)
 306                 RETURN(NULL);
 307
 308         value = strchr(param, '=');
 309         if (value)
 310                 name_len = value - param;
 311         else
 312                 name_len = strlen(param);
 313
 314         while (ptr->old_param) {
 315                 if (strncmp(param, ptr->old_param, name_len) == 0 &&
 316                     name_len == strlen(ptr->old_param))
 317                         RETURN(ptr);
 318                 ptr++;
 319         }
 320
 321         RETURN(NULL);
 322 }
 323 EXPORT_SYMBOL(class_find_old_param);
 324
 325 /**
 326  * Finds a parameter in \a params and copies it to \a copy.
 327  *
 328  * Leading spaces are skipped. Next space or end of string is the
 329  * parameter terminator with the exception that spaces inside single or double
 330  * quotes get included into a parameter. The parameter is copied into \a copy
 331  * which has to be allocated big enough by a caller, quotes are stripped in
 332  * the copy and the copy is terminated by 0.
 333  *
 334  * On return \a params is set to next parameter or to NULL if last
 335  * parameter is returned.
 336  *
 337  * \retval 0 if parameter is returned in \a copy
 338  * \retval 1 otherwise
 339  * \retval -EINVAL if unbalanced quota is found
 340  */
 341 int class_get_next_param(char **params, char *copy)
 342 {
 343         char *q1, *q2, *str;
 344         int len;
 345
 346         str = *params;
 347         while (*str == ' ')
 348                 str++;
 349
 350         if (*str == '\0') {
 351                 *params = NULL;
 352                 return 1;
 353         }
 354
 355         while (1) {
 356                 q1 = strpbrk(str, " '\"");
 357                 if (!q1) {
 358                         len = strlen(str);
 359                         memcpy(copy, str, len);
 360                         copy[len] = '\0';
 361                         *params = NULL;
 362                         return 0;
 363                 }
 364                 len = q1 - str;
 365                 if (*q1 == ' ') {
 366                         memcpy(copy, str, len);
 367                         copy[len] = '\0';
 368                         *params = str + len;
 369                         return 0;
 370                 }
 371
 372                 memcpy(copy, str, len);
 373                 copy += len;
 374
 375                 /* search for the matching closing quote */
 376                 str = q1 + 1;
 377                 q2 = strchr(str, *q1);
 378                 if (!q2) {
 379                         CERROR("Unbalanced quota in parameters: \"%s\"\n",
 380                                *params);
 381                         return -EINVAL;
 382                 }
 383                 len = q2 - str;
 384                 memcpy(copy, str, len);
 385                 copy += len;
 386                 str = q2 + 1;
 387         }
 388         return 1;
 389 }
 390 EXPORT_SYMBOL(class_get_next_param);
 391
 392 /*
 393  * returns 0 if this is the first key in the buffer, else 1.
 394  * valp points to first char after key.
 395  */
 396 int class_match_param(char *buf, const char *key, char **valp)
 397 {
 398         if (!buf)
 399                 return 1;
 400
 401         if (memcmp(buf, key, strlen(key)) != 0)
 402                 return 1;
 403
 404         if (valp)
 405                 *valp = buf + strlen(key);
 406
 407         return 0;
 408 }
 409 EXPORT_SYMBOL(class_match_param);
 410
 411 static int parse_nid(char *buf, void *value, int quiet)
 412 {
 413         lnet_nid_t *nid = (lnet_nid_t *)value;
 414
 415         *nid = libcfs_str2nid(buf);
 416         if (*nid != LNET_NID_ANY)
 417                 return 0;
 418
 419         if (!quiet)
 420                 LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
 421         return -EINVAL;
 422 }
 423
 424 static int parse_net(char *buf, void *value)
 425 {
 426         __u32 *net = (__u32 *)value;
 427
 428         *net = libcfs_str2net(buf);
 429         CDEBUG(D_INFO, "Net %s\n", libcfs_net2str(*net));
 430         return 0;
 431 }
 432
 433 enum {
 434         CLASS_PARSE_NID = 1,
 435         CLASS_PARSE_NET,
 436 };
 437
 438 /*
 439  * 0 is good NID,
 440  * 1 not found
 441  * < 0 error
 442  * endh is set to next separator
 443  */
 444 static int class_parse_value(char *buf, int opc, void *value, char **endh,
 445                              int quiet)
 446 {
 447         char *endp;
 448         char  tmp;
 449         int   rc = 0;
 450
 451         if (!buf)
 452                 return 1;
 453         while (*buf == ',' || *buf == ':')
 454                 buf++;
 455         if (*buf == ' ' || *buf == '/' || *buf == '\0')
 456                 return 1;
 457
 458         /* NID separators or end of NIDs */
 459         endp = strpbrk(buf, ",: /");
 460         if (!endp)
 461                 endp = buf + strlen(buf);
 462
 463         tmp = *endp;
 464         *endp = '\0';
 465         switch (opc) {
 466         default:
 467                 LBUG();
 468         case CLASS_PARSE_NID:
 469                 rc = parse_nid(buf, value, quiet);
 470                 break;
 471         case CLASS_PARSE_NET:
 472                 rc = parse_net(buf, value);
 473                 break;
 474         }
 475         *endp = tmp;
 476         if (rc != 0)
 477                 return rc;
 478         if (endh)
 479                 *endh = endp;
 480         return 0;
 481 }
 482
 483 int class_parse_nid(char *buf, lnet_nid_t *nid, char **endh)
 484 {
 485         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 0);
 486 }
 487 EXPORT_SYMBOL(class_parse_nid);
 488
 489 int class_parse_nid_quiet(char *buf, lnet_nid_t *nid, char **endh)
 490 {
 491         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 1);
 492 }
 493 EXPORT_SYMBOL(class_parse_nid_quiet);
 494
 495 int class_parse_net(char *buf, __u32 *net, char **endh)
 496 {
 497         return class_parse_value(buf, CLASS_PARSE_NET, (void *)net, endh, 0);
 498 }
 499
 500 /*
 501  * 1 param contains key and match
 502  * 0 param contains key and not match
 503  * -1 param does not contain key
 504  */
 505 int class_match_nid(char *buf, char *key, lnet_nid_t nid)
 506 {
 507         lnet_nid_t tmp;
 508         int rc = -1;
 509
 510         while (class_find_param(buf, key, &buf) == 0) {
 511                 /*
 512                  * please restrict to the NIDs pertaining to
 513                  * the specified NIDs
 514                  */
 515                 while (class_parse_nid(buf, &tmp, &buf) == 0) {
 516                         if (tmp == nid)
 517                                 return 1;
 518                 }
 519                 rc = 0;
 520         }
 521         return rc;
 522 }
 523 EXPORT_SYMBOL(class_match_nid);
 524
 525 int class_match_net(char *buf, char *key, __u32 net)
 526 {
 527         __u32 tmp;
 528         int rc = -1;
 529
 530         while (class_find_param(buf, key, &buf) == 0) {
 531                 /*
 532                  * please restrict to the NIDs pertaining to
 533                  * the specified networks
 534                  */
 535                 while (class_parse_net(buf, &tmp, &buf) == 0) {
 536                         if (tmp == net)
 537                                 return 1;
 538                 }
 539                 rc = 0;
 540         }
 541         return rc;
 542 }
 543 EXPORT_SYMBOL(class_match_net);
 544
 545 char *lustre_cfg_string(struct lustre_cfg *lcfg, u32 index)
 546 {
 547         char *s;
 548
 549         if (!lcfg->lcfg_buflens[index])
 550                 return NULL;
 551
 552         s = lustre_cfg_buf(lcfg, index);
 553         if (!s)
 554                 return NULL;
 555
 556         /*
 557          * make sure it's NULL terminated, even if this kills a char
 558          * of data.  Try to use the padding first though.
 559          */
 560         if (s[lcfg->lcfg_buflens[index] - 1] != '\0') {
 561                 size_t last = ALIGN(lcfg->lcfg_buflens[index], 8) - 1;
 562                 char lost;
 563
 564                 /* Use the smaller value */
 565                 if (last > lcfg->lcfg_buflens[index])
 566                         last = lcfg->lcfg_buflens[index];
 567
 568                 lost = s[last];
 569                 s[last] = '\0';
 570                 if (lost != '\0') {
 571                         CWARN("Truncated buf %d to '%s' (lost '%c'...)\n",
 572                               index, s, lost);
 573                 }
 574         }
 575         return s;
 576 }
 577 EXPORT_SYMBOL(lustre_cfg_string);
 578
 579 /********************** class fns **********************/
 580
 581 /**
 582  * Create a new OBD device and set the type, name and uuid.  If successful,
 583  * the new device can be accessed by either name or uuid.
 584  */
 585 int class_attach(struct lustre_cfg *lcfg)
 586 {
 587         struct obd_export *exp;
 588         struct obd_device *obd = NULL;
 589         char *typename, *name, *uuid;
 590         int rc, len;
 591
 592         ENTRY;
 593
 594         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 595                 CERROR("No type passed!\n");
 596                 RETURN(-EINVAL);
 597         }
 598         typename = lustre_cfg_string(lcfg, 1);
 599
 600         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 601                 CERROR("No name passed!\n");
 602                 RETURN(-EINVAL);
 603         }
 604         name = lustre_cfg_string(lcfg, 0);
 605         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 606                 CERROR("No UUID passed!\n");
 607                 RETURN(-EINVAL);
 608         }
 609
 610         uuid = lustre_cfg_string(lcfg, 2);
 611         len = strlen(uuid);
 612         if (len >= sizeof(obd->obd_uuid)) {
 613                 CERROR("%s: uuid must be < %d bytes long\n",
 614                        name, (int)sizeof(obd->obd_uuid));
 615                 RETURN(-EINVAL);
 616         }
 617
 618         obd = class_newdev(typename, name, uuid);
 619         if (IS_ERR(obd)) { /* Already exists or out of obds */
 620                 rc = PTR_ERR(obd);
 621                 CERROR("Cannot create device %s of type %s : %d\n",
 622                        name, typename, rc);
 623                 RETURN(rc);
 624         }
 625         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 626                  "obd %p obd_magic %08X != %08X\n",
 627                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 628         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 629                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 630
 631         exp = class_new_export_self(obd, &obd->obd_uuid);
 632         if (IS_ERR(exp)) {
 633                 rc = PTR_ERR(exp);
 634                 class_free_dev(obd);
 635                 RETURN(rc);
 636         }
 637
 638         obd->obd_self_export = exp;
 639         list_del_init(&exp->exp_obd_chain_timed);
 640         class_export_put(exp);
 641
 642         rc = class_register_device(obd);
 643         if (rc != 0) {
 644                 class_decref(obd, "newdev", obd);
 645                 RETURN(rc);
 646         }
 647
 648         obd->obd_attached = 1;
 649         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 650                obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
 651
 652         RETURN(0);
 653 }
 654 EXPORT_SYMBOL(class_attach);
 655
 656 /**
 657  * Create hashes, self-export, and call type-specific setup.
 658  * Setup is effectively the "start this obd" call.
 659  */
 660 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 661 {
 662         int err = 0;
 663
 664         ENTRY;
 665
 666         LASSERT(obd != NULL);
 667         LASSERTF(obd == class_num2obd(obd->obd_minor),
 668                  "obd %p != obd_devs[%d] %p\n",
 669                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 670         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 671                  "obd %p obd_magic %08x != %08x\n",
 672                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 673
 674         /* have we attached a type to this device? */
 675         if (!obd->obd_attached) {
 676                 CERROR("Device %d not attached\n", obd->obd_minor);
 677                 RETURN(-ENODEV);
 678         }
 679
 680         if (obd->obd_set_up) {
 681                 CERROR("Device %d already setup (type %s)\n",
 682                        obd->obd_minor, obd->obd_type->typ_name);
 683                 RETURN(-EEXIST);
 684         }
 685
 686         /* is someone else setting us up right now? (attach inits spinlock) */
 687         spin_lock(&obd->obd_dev_lock);
 688         if (obd->obd_starting) {
 689                 spin_unlock(&obd->obd_dev_lock);
 690                 CERROR("Device %d setup in progress (type %s)\n",
 691                        obd->obd_minor, obd->obd_type->typ_name);
 692                 RETURN(-EEXIST);
 693         }
 694         /*
 695          * just leave this on forever.  I can't use obd_set_up here because
 696          * other fns check that status, and we're not actually set up yet.
 697          */
 698         obd->obd_starting = 1;
 699         obd->obd_nid_stats_hash = NULL;
 700         obd->obd_gen_hash = NULL;
 701         spin_unlock(&obd->obd_dev_lock);
 702
 703         /* create an uuid-export lustre hash */
 704         err = rhashtable_init(&obd->obd_uuid_hash, &uuid_hash_params);
 705         if (err)
 706                 GOTO(err_starting, err);
 707
 708 #ifdef HAVE_SERVER_SUPPORT
 709         /* create a nid-export lustre hash */
 710         err = rhltable_init(&obd->obd_nid_hash, &nid_hash_params);
 711         if (err)
 712                 GOTO(err_uuid_hash, err = -ENOMEM);
 713
 714         /* create a nid-stats lustre hash */
 715         obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
 716                                                   HASH_NID_STATS_CUR_BITS,
 717                                                   HASH_NID_STATS_MAX_BITS,
 718                                                   HASH_NID_STATS_BKT_BITS, 0,
 719                                                   CFS_HASH_MIN_THETA,
 720                                                   CFS_HASH_MAX_THETA,
 721                                                   &nid_stat_hash_ops,
 722                                                   CFS_HASH_DEFAULT);
 723         if (!obd->obd_nid_stats_hash)
 724                 GOTO(err_nid_hash, err = -ENOMEM);
 725
 726         /* create a client_generation-export lustre hash */
 727         obd->obd_gen_hash = cfs_hash_create("UUID_HASH",
 728                                             HASH_GEN_CUR_BITS,
 729                                             HASH_GEN_MAX_BITS,
 730                                             HASH_GEN_BKT_BITS, 0,
 731                                             CFS_HASH_MIN_THETA,
 732                                             CFS_HASH_MAX_THETA,
 733                                             &gen_hash_ops, CFS_HASH_DEFAULT);
 734         if (!obd->obd_gen_hash)
 735                 GOTO(err_nid_stats_hash, err = -ENOMEM);
 736 #endif /* HAVE_SERVER_SUPPORT */
 737
 738         err = obd_setup(obd, lcfg);
 739         if (err)
 740 #ifdef HAVE_SERVER_SUPPORT
 741                 GOTO(err_gen_hash, err);
 742 #else
 743                 GOTO(err_uuid_hash, err);
 744 #endif /* ! HAVE_SERVER_SUPPORT */
 745
 746         obd->obd_set_up = 1;
 747
 748         spin_lock(&obd->obd_dev_lock);
 749         /* cleanup drops this */
 750         class_incref(obd, "setup", obd);
 751         spin_unlock(&obd->obd_dev_lock);
 752
 753         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 754                obd->obd_name, obd->obd_uuid.uuid);
 755
 756         RETURN(0);
 757
 758 #ifdef HAVE_SERVER_SUPPORT
 759 err_gen_hash:
 760         if (obd->obd_gen_hash) {
 761                 cfs_hash_putref(obd->obd_gen_hash);
 762                 obd->obd_gen_hash = NULL;
 763         }
 764 err_nid_stats_hash:
 765         if (obd->obd_nid_stats_hash) {
 766                 cfs_hash_putref(obd->obd_nid_stats_hash);
 767                 obd->obd_nid_stats_hash = NULL;
 768         }
 769 err_nid_hash:
 770         rhltable_destroy(&obd->obd_nid_hash);
 771 #endif /* HAVE_SERVER_SUPPORT */
 772 err_uuid_hash:
 773         rhashtable_destroy(&obd->obd_uuid_hash);
 774 err_starting:
 775         obd->obd_starting = 0;
 776         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 777         return err;
 778 }
 779 EXPORT_SYMBOL(class_setup);
 780
 781 /**
 782  * We have finished using this OBD and are ready to destroy it.
 783  * There can be no more references to this obd.
 784  */
 785 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 786 {
 787         ENTRY;
 788
 789         if (obd->obd_set_up) {
 790                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 791                 RETURN(-EBUSY);
 792         }
 793
 794         spin_lock(&obd->obd_dev_lock);
 795         if (!obd->obd_attached) {
 796                 spin_unlock(&obd->obd_dev_lock);
 797                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 798                 RETURN(-ENODEV);
 799         }
 800         obd->obd_attached = 0;
 801         spin_unlock(&obd->obd_dev_lock);
 802
 803         /* cleanup in progress. we don't like to find this device after now */
 804         class_unregister_device(obd);
 805
 806         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 807                obd->obd_name, obd->obd_uuid.uuid);
 808
 809         class_decref(obd, "newdev", obd);
 810
 811         RETURN(0);
 812 }
 813 EXPORT_SYMBOL(class_detach);
 814
 815 /**
 816  * Start shutting down the OBD.  There may be in-progess ops when
 817  * this is called.  We tell them to start shutting down with a call
 818  * to class_disconnect_exports().
 819  */
 820 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 821 {
 822         int err = 0;
 823         char *flag;
 824         ENTRY;
 825
 826         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 827
 828         if (!obd->obd_set_up) {
 829                 CERROR("Device %d not setup\n", obd->obd_minor);
 830                 RETURN(-ENODEV);
 831         }
 832
 833         spin_lock(&obd->obd_dev_lock);
 834         if (obd->obd_stopping) {
 835                 spin_unlock(&obd->obd_dev_lock);
 836                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 837                 RETURN(-ENODEV);
 838         }
 839         /* Leave this on forever */
 840         obd->obd_stopping = 1;
 841         spin_unlock(&obd->obd_dev_lock);
 842
 843         /* wait for already-arrived-connections to finish. */
 844         while (obd->obd_conn_inprogress > 0)
 845                 yield();
 846         smp_rmb();
 847
 848         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 849                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 850                         switch (*flag) {
 851                         case 'F':
 852                                 obd->obd_force = 1;
 853                                 break;
 854                         case 'A':
 855                                 LCONSOLE_WARN("Failing over %s\n",
 856                                               obd->obd_name);
 857                                 spin_lock(&obd->obd_dev_lock);
 858                                 obd->obd_fail = 1;
 859 #ifdef HAVE_SERVER_SUPPORT
 860                                 obd->obd_no_transno = 1;
 861 #endif
 862                                 obd->obd_no_recov = 1;
 863                                 spin_unlock(&obd->obd_dev_lock);
 864                                 if (OBP(obd, iocontrol)) {
 865                                         obd_iocontrol(OBD_IOC_SYNC,
 866                                                       obd->obd_self_export,
 867                                                       0, NULL, NULL);
 868                                 }
 869                                 break;
 870                         default:
 871                                 CERROR("Unrecognised flag '%c'\n", *flag);
 872                         }
 873         }
 874
 875         LASSERT(obd->obd_self_export);
 876
 877         CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d/%d\n",
 878                obd->obd_name, obd->obd_num_exports,
 879                atomic_read(&obd->obd_refcount) - 2);
 880         dump_exports(obd, 0, D_HA);
 881         class_disconnect_exports(obd);
 882
 883         /* Precleanup, we must make sure all exports get destroyed. */
 884         err = obd_precleanup(obd);
 885         if (err)
 886                 CERROR("Precleanup %s returned %d\n",
 887                        obd->obd_name, err);
 888
 889         /* destroy an uuid-export hash body */
 890         rhashtable_free_and_destroy(&obd->obd_uuid_hash, obd_export_exit,
 891                                     NULL);
 892 #ifdef HAVE_SERVER_SUPPORT
 893         /* destroy a nid-export hash body */
 894         rhltable_free_and_destroy(&obd->obd_nid_hash, nid_export_exit, NULL);
 895
 896         /* destroy a nid-stats hash body */
 897         if (obd->obd_nid_stats_hash) {
 898                 cfs_hash_putref(obd->obd_nid_stats_hash);
 899                 obd->obd_nid_stats_hash = NULL;
 900         }
 901
 902         /* destroy a client_generation-export hash body */
 903         if (obd->obd_gen_hash) {
 904                 cfs_hash_putref(obd->obd_gen_hash);
 905                 obd->obd_gen_hash = NULL;
 906         }
 907 #endif /* HAVE_SERVER_SUPPORT */
 908         class_decref(obd, "setup", obd);
 909         obd->obd_set_up = 0;
 910
 911         RETURN(0);
 912 }
 913
 914 struct obd_device *class_incref(struct obd_device *obd,
 915                                 const char *scope,
 916                                 const void *source)
 917 {
 918         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 919         atomic_inc(&obd->obd_refcount);
 920         CDEBUG(D_INFO, "incref %s (%p) now %d - %s\n", obd->obd_name, obd,
 921                atomic_read(&obd->obd_refcount), scope);
 922
 923         return obd;
 924 }
 925 EXPORT_SYMBOL(class_incref);
 926
 927 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 928 {
 929         int last;
 930
 931         CDEBUG(D_INFO, "Decref %s (%p) now %d - %s\n", obd->obd_name, obd,
 932                atomic_read(&obd->obd_refcount), scope);
 933
 934         LASSERT(obd->obd_num_exports >= 0);
 935         last = atomic_dec_and_test(&obd->obd_refcount);
 936         lu_ref_del(&obd->obd_reference, scope, source);
 937
 938         if (last) {
 939                 struct obd_export *exp;
 940
 941                 LASSERT(!obd->obd_attached);
 942                 /*
 943                  * All exports have been destroyed; there should
 944                  * be no more in-progress ops by this point.
 945                  */
 946                 exp = obd->obd_self_export;
 947
 948                 if (exp) {
 949                         exp->exp_flags |= exp_flags_from_obd(obd);
 950                         class_unlink_export(exp);
 951                 }
 952         }
 953 }
 954 EXPORT_SYMBOL(class_decref);
 955
 956 /**
 957  * Add a failover NID location.
 958  * Client OBD types contact server OBD types using this NID list.
 959  */
 960 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 961 {
 962         struct obd_import *imp;
 963         struct obd_uuid uuid;
 964         int rc;
 965
 966         ENTRY;
 967
 968         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 969             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 970                 CERROR("invalid conn_uuid\n");
 971                 RETURN(-EINVAL);
 972         }
 973         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 974             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
 975             strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) &&
 976             strcmp(obd->obd_type->typ_name, LUSTRE_LWP_NAME) &&
 977             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
 978                 CERROR("can't add connection on non-client dev\n");
 979                 RETURN(-EINVAL);
 980         }
 981
 982         imp = obd->u.cli.cl_import;
 983         if (!imp) {
 984                 CERROR("try to add conn on immature client dev\n");
 985                 RETURN(-EINVAL);
 986         }
 987
 988         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 989         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
 990
 991         RETURN(rc);
 992 }
 993 EXPORT_SYMBOL(class_add_conn);
 994
 995 /** Remove a failover NID location. */
 996 static int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 997 {
 998         struct obd_import *imp;
 999         struct obd_uuid uuid;
1000         int rc;
1001
1002         ENTRY;
1003
1004         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
1005             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
1006                 CERROR("invalid conn_uuid\n");
1007                 RETURN(-EINVAL);
1008         }
1009         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
1010             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
1011                 CERROR("can't del connection on non-client dev\n");
1012                 RETURN(-EINVAL);
1013         }
1014
1015         imp = obd->u.cli.cl_import;
1016         if (!imp) {
1017                 CERROR("try to del conn on immature client dev\n");
1018                 RETURN(-EINVAL);
1019         }
1020
1021         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
1022         rc = obd_del_conn(imp, &uuid);
1023
1024         RETURN(rc);
1025 }
1026
1027 static LIST_HEAD(lustre_profile_list);
1028 static DEFINE_SPINLOCK(lustre_profile_list_lock);
1029
1030 struct lustre_profile *class_get_profile(const char *prof)
1031 {
1032         struct lustre_profile *lprof;
1033
1034         ENTRY;
1035         spin_lock(&lustre_profile_list_lock);
1036         list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
1037                 if (!strcmp(lprof->lp_profile, prof)) {
1038                         lprof->lp_refs++;
1039                         spin_unlock(&lustre_profile_list_lock);
1040                         RETURN(lprof);
1041                 }
1042         }
1043         spin_unlock(&lustre_profile_list_lock);
1044         RETURN(NULL);
1045 }
1046 EXPORT_SYMBOL(class_get_profile);
1047
1048 /**
1049  * Create a named "profile".
1050  * This defines the MDC and OSC names to use for a client.
1051  * This also is used to define the LOV to be used by a MDT.
1052  */
1053 static int class_add_profile(int proflen, char *prof, int osclen, char *osc,
1054                              int mdclen, char *mdc)
1055 {
1056         struct lustre_profile *lprof;
1057         int err = 0;
1058
1059         ENTRY;
1060
1061         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
1062
1063         OBD_ALLOC(lprof, sizeof(*lprof));
1064         if (!lprof)
1065                 RETURN(-ENOMEM);
1066         INIT_LIST_HEAD(&lprof->lp_list);
1067
1068         LASSERT(proflen == (strlen(prof) + 1));
1069         OBD_ALLOC(lprof->lp_profile, proflen);
1070         if (!lprof->lp_profile)
1071                 GOTO(out, err = -ENOMEM);
1072         memcpy(lprof->lp_profile, prof, proflen);
1073
1074         LASSERT(osclen == (strlen(osc) + 1));
1075         OBD_ALLOC(lprof->lp_dt, osclen);
1076         if (!lprof->lp_dt)
1077                 GOTO(out, err = -ENOMEM);
1078         memcpy(lprof->lp_dt, osc, osclen);
1079
1080         if (mdclen > 0) {
1081                 LASSERT(mdclen == (strlen(mdc) + 1));
1082                 OBD_ALLOC(lprof->lp_md, mdclen);
1083                 if (!lprof->lp_md)
1084                         GOTO(out, err = -ENOMEM);
1085                 memcpy(lprof->lp_md, mdc, mdclen);
1086         }
1087
1088         spin_lock(&lustre_profile_list_lock);
1089         lprof->lp_refs = 1;
1090         lprof->lp_list_deleted = false;
1091
1092         list_add(&lprof->lp_list, &lustre_profile_list);
1093         spin_unlock(&lustre_profile_list_lock);
1094         RETURN(err);
1095
1096 out:
1097         if (lprof->lp_md)
1098                 OBD_FREE(lprof->lp_md, mdclen);
1099         if (lprof->lp_dt)
1100                 OBD_FREE(lprof->lp_dt, osclen);
1101         if (lprof->lp_profile)
1102                 OBD_FREE(lprof->lp_profile, proflen);
1103         OBD_FREE(lprof, sizeof(*lprof));
1104         RETURN(err);
1105 }
1106
1107 void class_del_profile(const char *prof)
1108 {
1109         struct lustre_profile *lprof;
1110
1111         ENTRY;
1112
1113         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
1114
1115         lprof = class_get_profile(prof);
1116         if (lprof) {
1117                 spin_lock(&lustre_profile_list_lock);
1118                 /* because get profile increments the ref counter */
1119                 lprof->lp_refs--;
1120                 list_del(&lprof->lp_list);
1121                 lprof->lp_list_deleted = true;
1122                 spin_unlock(&lustre_profile_list_lock);
1123
1124                 class_put_profile(lprof);
1125         }
1126         EXIT;
1127 }
1128 EXPORT_SYMBOL(class_del_profile);
1129
1130 void class_put_profile(struct lustre_profile *lprof)
1131 {
1132         spin_lock(&lustre_profile_list_lock);
1133         if ((--lprof->lp_refs) > 0) {
1134                 LASSERT(lprof->lp_refs > 0);
1135                 spin_unlock(&lustre_profile_list_lock);
1136                 return;
1137         }
1138         spin_unlock(&lustre_profile_list_lock);
1139
1140         /* confirm not a negative number */
1141         LASSERT(lprof->lp_refs == 0);
1142
1143         /*
1144          * At least one class_del_profile/profiles must be called
1145          * on the target profile or lustre_profile_list will corrupt
1146          */
1147         LASSERT(lprof->lp_list_deleted);
1148         OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
1149         OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
1150         if (lprof->lp_md)
1151                 OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
1152         OBD_FREE(lprof, sizeof(*lprof));
1153 }
1154 EXPORT_SYMBOL(class_put_profile);
1155
1156 /* COMPAT_146 */
1157 void class_del_profiles(void)
1158 {
1159         struct lustre_profile *lprof, *n;
1160         ENTRY;
1161
1162         spin_lock(&lustre_profile_list_lock);
1163         list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
1164                 list_del(&lprof->lp_list);
1165                 lprof->lp_list_deleted = true;
1166                 spin_unlock(&lustre_profile_list_lock);
1167
1168                 class_put_profile(lprof);
1169
1170                 spin_lock(&lustre_profile_list_lock);
1171         }
1172         spin_unlock(&lustre_profile_list_lock);
1173         EXIT;
1174 }
1175 EXPORT_SYMBOL(class_del_profiles);
1176
1177 /*
1178  * We can't call lquota_process_config directly because
1179  * it lives in a module that must be loaded after this one.
1180  */
1181 #ifdef HAVE_SERVER_SUPPORT
1182 static int (*quota_process_config)(struct lustre_cfg *lcfg) = NULL;
1183 #endif /* HAVE_SERVER_SUPPORT */
1184
1185 /**
1186  * Rename the proc parameter in \a cfg with a new name \a new_name.
1187  *
1188  * \param cfg      config structure which contains the proc parameter
1189  * \param new_name new name of the proc parameter
1190  *
1191  * \retval valid-pointer    pointer to the newly-allocated config structure
1192  *                          which contains the renamed proc parameter
1193  * \retval ERR_PTR(-EINVAL) if \a cfg or \a new_name is NULL, or \a cfg does
1194  *                          not contain a proc parameter
1195  * \retval ERR_PTR(-ENOMEM) if memory allocation failure occurs
1196  */
1197 struct lustre_cfg *lustre_cfg_rename(struct lustre_cfg *cfg,
1198                                      const char *new_name)
1199 {
1200         struct lustre_cfg_bufs *bufs = NULL;
1201         struct lustre_cfg *new_cfg = NULL;
1202         char *param = NULL;
1203         char *new_param = NULL;
1204         char *value = NULL;
1205         int name_len = 0;
1206         int new_len = 0;
1207
1208         ENTRY;
1209
1210         if (!cfg || !new_name)
1211                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1212
1213         param = lustre_cfg_string(cfg, 1);
1214         if (!param)
1215                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1216
1217         value = strchr(param, '=');
1218         if (value)
1219                 name_len = value - param;
1220         else
1221                 name_len = strlen(param);
1222
1223         new_len = LUSTRE_CFG_BUFLEN(cfg, 1) + strlen(new_name) - name_len;
1224
1225         OBD_ALLOC(new_param, new_len);
1226         if (!new_param)
1227                 GOTO(out_nocfg, new_cfg = ERR_PTR(-ENOMEM));
1228
1229         strlcpy(new_param, new_name, new_len);
1230         if (value)
1231                 strcat(new_param, value);
1232
1233         OBD_ALLOC_PTR(bufs);
1234         if (!bufs)
1235                 GOTO(out_free_param, new_cfg = ERR_PTR(-ENOMEM));
1236
1237         lustre_cfg_bufs_reset(bufs, NULL);
1238         lustre_cfg_bufs_init(bufs, cfg);
1239         lustre_cfg_bufs_set_string(bufs, 1, new_param);
1240
1241         OBD_ALLOC(new_cfg, lustre_cfg_len(bufs->lcfg_bufcount,
1242                                           bufs->lcfg_buflen));
1243         if (!new_cfg)
1244                 GOTO(out_free_buf, new_cfg = ERR_PTR(-ENOMEM));
1245
1246         lustre_cfg_init(new_cfg, cfg->lcfg_command, bufs);
1247
1248         new_cfg->lcfg_num = cfg->lcfg_num;
1249         new_cfg->lcfg_flags = cfg->lcfg_flags;
1250         new_cfg->lcfg_nid = cfg->lcfg_nid;
1251         new_cfg->lcfg_nal = cfg->lcfg_nal;
1252 out_free_buf:
1253         OBD_FREE_PTR(bufs);
1254 out_free_param:
1255         OBD_FREE(new_param, new_len);
1256 out_nocfg:
1257         RETURN(new_cfg);
1258 }
1259 EXPORT_SYMBOL(lustre_cfg_rename);
1260
1261 static ssize_t process_param2_config(struct lustre_cfg *lcfg)
1262 {
1263         char *param = lustre_cfg_string(lcfg, 1);
1264         char *upcall = lustre_cfg_string(lcfg, 2);
1265         struct kobject *kobj = NULL;
1266         const char *subsys = param;
1267         char *newparam = NULL;
1268         char *argv[] = {
1269                 [0] = "/usr/sbin/lctl",
1270                 [1] = "set_param",
1271                 [2] = param,
1272                 [3] = NULL
1273         };
1274         ktime_t start;
1275         ktime_t end;
1276         size_t len;
1277         int rc;
1278
1279         ENTRY;
1280         print_lustre_cfg(lcfg);
1281
1282         len = strcspn(param, ".=");
1283         if (!len)
1284                 RETURN(-EINVAL);
1285
1286         /* If we find '=' then its the top level sysfs directory */
1287         if (param[len] == '=')
1288                 RETURN(class_set_global(param));
1289
1290         subsys = kstrndup(param, len, GFP_KERNEL);
1291         if (!subsys)
1292                 RETURN(-ENOMEM);
1293
1294         kobj = kset_find_obj(lustre_kset, subsys);
1295         kfree(subsys);
1296         if (kobj) {
1297                 char *value = param;
1298                 char *envp[4];
1299                 int i;
1300
1301                 param = strsep(&value, "=");
1302                 envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s", param);
1303                 envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1304                 envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1305                                     ktime_get_real_seconds());
1306                 envp[3] = NULL;
1307
1308                 rc = kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
1309                 for (i = 0; i < ARRAY_SIZE(envp); i++)
1310                         kfree(envp[i]);
1311
1312                 kobject_put(kobj);
1313
1314                 RETURN(rc);
1315         }
1316
1317         /* Add upcall processing here. Now only lctl is supported */
1318         if (strcmp(upcall, LCTL_UPCALL) != 0) {
1319                 CERROR("Unsupported upcall %s\n", upcall);
1320                 RETURN(-EINVAL);
1321         }
1322
1323         /* root_squash and nosquash_nids settings must be applied to
1324          * global subsystem (*.) so that it is taken into account by
1325          * both client and server sides. So do the equivalent of a
1326          * 's / mdt. / *. /'.
1327          */
1328         if ((strstr(param, PARAM_NOSQUASHNIDS) ||
1329              strstr(param, PARAM_ROOTSQUASH)) &&
1330             (param[0] != '*' || param[1] != '.')) {
1331                 newparam = kmalloc(strlen(param) + 1, GFP_NOFS);
1332                 if (!newparam)
1333                         RETURN(-ENOMEM);
1334
1335                 snprintf(newparam, strlen(param) + 1, "*%s", param + len);
1336                 argv[2] = (char *)newparam;
1337         }
1338
1339         start = ktime_get();
1340         rc = call_usermodehelper(argv[0], argv, NULL, UMH_WAIT_PROC);
1341         end = ktime_get();
1342
1343         if (rc < 0) {
1344                 CERROR("lctl: error invoking upcall %s %s %s: rc = %d; "
1345                        "time %ldus\n", argv[0], argv[1], argv[2], rc,
1346                        (long)ktime_us_delta(end, start));
1347         } else {
1348                 CDEBUG(D_HA, "lctl: invoked upcall %s %s %s, time %ldus\n",
1349                        argv[0], argv[1], argv[2],
1350                        (long)ktime_us_delta(end, start));
1351                        rc = 0;
1352         }
1353
1354         kfree(newparam);
1355         RETURN(rc);
1356 }
1357
1358 #ifdef HAVE_SERVER_SUPPORT
1359 void lustre_register_quota_process_config(int (*qpc)(struct lustre_cfg *lcfg))
1360 {
1361         quota_process_config = qpc;
1362 }
1363 EXPORT_SYMBOL(lustre_register_quota_process_config);
1364 #endif /* HAVE_SERVER_SUPPORT */
1365
1366 /**
1367  * Process configuration commands given in lustre_cfg form.
1368  * These may come from direct calls (e.g. class_manual_cleanup)
1369  * or processing the config llog, or ioctl from lctl.
1370  */
1371 int class_process_config(struct lustre_cfg *lcfg)
1372 {
1373         struct obd_device *obd;
1374         int err;
1375
1376         LASSERT(lcfg && !IS_ERR(lcfg));
1377         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
1378
1379         /* Commands that don't need a device */
1380         switch (lcfg->lcfg_command) {
1381         case LCFG_ATTACH: {
1382                 err = class_attach(lcfg);
1383                 GOTO(out, err);
1384         }
1385         case LCFG_ADD_UUID: {
1386                 CDEBUG(D_IOCTL,
1387                        "adding mapping from uuid %s to nid %#llx (%s)\n",
1388                        lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid,
1389                        libcfs_nid2str(lcfg->lcfg_nid));
1390
1391                 err = class_add_uuid(lustre_cfg_string(lcfg, 1),
1392                                      lcfg->lcfg_nid);
1393                 GOTO(out, err);
1394         }
1395         case LCFG_DEL_UUID: {
1396                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
1397                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) ==
1398                         0) ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
1399
1400                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
1401                 GOTO(out, err);
1402         }
1403         case LCFG_MOUNTOPT: {
1404                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
1405                        lustre_cfg_string(lcfg, 1),
1406                        lustre_cfg_string(lcfg, 2),
1407                        lustre_cfg_string(lcfg, 3));
1408                 /*
1409                  * set these mount options somewhere, so ll_fill_super
1410                  * can find them.
1411                  */
1412                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
1413                                         lustre_cfg_string(lcfg, 1),
1414                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
1415                                         lustre_cfg_string(lcfg, 2),
1416                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
1417                                         lustre_cfg_string(lcfg, 3));
1418                 GOTO(out, err);
1419         }
1420         case LCFG_DEL_MOUNTOPT: {
1421                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
1422                        lustre_cfg_string(lcfg, 1));
1423                 class_del_profile(lustre_cfg_string(lcfg, 1));
1424                 GOTO(out, err = 0);
1425         }
1426         case LCFG_SET_TIMEOUT: {
1427                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
1428                        obd_timeout, lcfg->lcfg_num);
1429                 obd_timeout = max(lcfg->lcfg_num, 1U);
1430                 ping_interval = max(obd_timeout / 4, 1U);
1431                 obd_timeout_set = 1;
1432                 GOTO(out, err = 0);
1433         }
1434         case LCFG_SET_LDLM_TIMEOUT: {
1435                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
1436                        ldlm_timeout, lcfg->lcfg_num);
1437                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
1438                 if (ldlm_timeout >= obd_timeout)
1439                         ldlm_timeout = max(obd_timeout / 3, 1U);
1440                 ldlm_timeout_set = 1;
1441                 GOTO(out, err = 0);
1442         }
1443         case LCFG_SET_UPCALL: {
1444                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
1445                 /* COMPAT_146 Don't fail on old configs */
1446                 GOTO(out, err = 0);
1447         }
1448         case LCFG_MARKER: {
1449                 struct cfg_marker *marker;
1450
1451                 marker = lustre_cfg_buf(lcfg, 1);
1452                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
1453                        marker->cm_flags, marker->cm_tgtname,
1454                        marker->cm_comment);
1455                 GOTO(out, err = 0);
1456         }
1457         case LCFG_PARAM: {
1458                 char *tmp;
1459
1460                 /* llite has no OBD */
1461                 if (class_match_param(lustre_cfg_string(lcfg, 1),
1462                                       PARAM_LLITE, NULL) == 0) {
1463                         struct lustre_sb_info *lsi;
1464                         unsigned long addr;
1465                         ssize_t count;
1466
1467                         /*
1468                          * The instance name contains the sb:
1469                          * lustre-client-aacfe000
1470                          */
1471                         tmp = strrchr(lustre_cfg_string(lcfg, 0), '-');
1472                         if (!tmp || !*(++tmp))
1473                                 GOTO(out, err = -EINVAL);
1474
1475                         if (sscanf(tmp, "%lx", &addr) != 1)
1476                                 GOTO(out, err = -EINVAL);
1477
1478                         lsi = s2lsi((struct super_block *)addr);
1479                         /* This better be a real Lustre superblock! */
1480                         LASSERT(lsi->lsi_lmd->lmd_magic == LMD_MAGIC);
1481
1482                         count = class_modify_config(lcfg, PARAM_LLITE,
1483                                                     lsi->lsi_kobj);
1484                         err = count < 0 ? count : 0;
1485                         GOTO(out, err);
1486                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1487                                               PARAM_SYS, &tmp) == 0)) {
1488                         /* Global param settings */
1489                         err = class_set_global(tmp);
1490                         /*
1491                          * Client or server should not fail to mount if
1492                          * it hits an unknown configuration parameter.
1493                          */
1494                         if (err < 0)
1495                                 CWARN("Ignoring unknown param %s\n", tmp);
1496
1497                         GOTO(out, err = 0);
1498 #ifdef HAVE_SERVER_SUPPORT
1499                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1500                                               PARAM_QUOTA, &tmp) == 0) &&
1501                            quota_process_config) {
1502                         err = (*quota_process_config)(lcfg);
1503                         GOTO(out, err);
1504 #endif /* HAVE_SERVER_SUPPORT */
1505                 }
1506
1507                 break;
1508         }
1509         case LCFG_SET_PARAM: {
1510                 err = process_param2_config(lcfg);
1511                 GOTO(out, err = 0);
1512         }
1513         }
1514         /* Commands that require a device */
1515         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1516         if (!obd) {
1517                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
1518                         CERROR("this lcfg command requires a device name\n");
1519                 else
1520                         CERROR("no device for: %s\n",
1521                                lustre_cfg_string(lcfg, 0));
1522
1523                 GOTO(out, err = -EINVAL);
1524         }
1525         switch(lcfg->lcfg_command) {
1526         case LCFG_SETUP: {
1527                 err = class_setup(obd, lcfg);
1528                 GOTO(out, err);
1529         }
1530         case LCFG_DETACH: {
1531                 err = class_detach(obd, lcfg);
1532                 GOTO(out, err = 0);
1533         }
1534         case LCFG_CLEANUP: {
1535                 err = class_cleanup(obd, lcfg);
1536                 GOTO(out, err = 0);
1537         }
1538         case LCFG_ADD_CONN: {
1539                 err = class_add_conn(obd, lcfg);
1540                 GOTO(out, err = 0);
1541         }
1542         case LCFG_DEL_CONN: {
1543                 err = class_del_conn(obd, lcfg);
1544                 GOTO(out, err = 0);
1545         }
1546         case LCFG_POOL_NEW: {
1547                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
1548                 GOTO(out, err = 0);
1549         }
1550         case LCFG_POOL_ADD: {
1551                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
1552                                    lustre_cfg_string(lcfg, 3));
1553                 GOTO(out, err = 0);
1554         }
1555         case LCFG_POOL_REM: {
1556                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
1557                                    lustre_cfg_string(lcfg, 3));
1558                 GOTO(out, err = 0);
1559         }
1560         case LCFG_POOL_DEL: {
1561                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
1562                 GOTO(out, err = 0);
1563         }
1564         /*
1565          * Process config log ADD_MDC record twice to add MDC also to LOV
1566          * for Data-on-MDT:
1567          *
1568          * add 0:lustre-clilmv 1:lustre-MDT0000_UUID 2:0 3:1
1569          *     4:lustre-MDT0000-mdc_UUID
1570          */
1571         case LCFG_ADD_MDC: {
1572                 struct obd_device *lov_obd;
1573                 char *clilmv;
1574
1575                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1576                 if (err)
1577                         GOTO(out, err);
1578
1579                 /* make sure this is client LMV log entry */
1580                 clilmv = strstr(lustre_cfg_string(lcfg, 0), "clilmv");
1581                 if (!clilmv)
1582                         GOTO(out, err);
1583
1584                 /*
1585                  * replace 'lmv' with 'lov' name to address LOV device and
1586                  * process llog record to add MDC there.
1587                  */
1588                 clilmv[4] = 'o';
1589                 lov_obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1590                 if (lov_obd) {
1591                         err = obd_process_config(lov_obd, sizeof(*lcfg), lcfg);
1592                 } else {
1593                         err = -ENOENT;
1594                         CERROR("%s: Cannot find LOV by %s name, rc = %d\n",
1595                                obd->obd_name, lustre_cfg_string(lcfg, 0), err);
1596                 }
1597                 /* restore 'lmv' name */
1598                 clilmv[4] = 'm';
1599                 GOTO(out, err);
1600         }
1601         default: {
1602                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1603                 GOTO(out, err);
1604         }
1605         }
1606         EXIT;
1607 out:
1608         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
1609                 CWARN("Ignoring error %d on optional command %#x\n", err,
1610                       lcfg->lcfg_command);
1611                 err = 0;
1612         }
1613         return err;
1614 }
1615 EXPORT_SYMBOL(class_process_config);
1616
1617 ssize_t class_modify_config(struct lustre_cfg *lcfg, const char *prefix,
1618                             struct kobject *kobj)
1619 {
1620         struct kobj_type *typ;
1621         ssize_t count = 0;
1622         int i;
1623
1624         if (lcfg->lcfg_command != LCFG_PARAM) {
1625                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1626                 return -EINVAL;
1627         }
1628
1629         typ = get_ktype(kobj);
1630         if (!typ || !typ->default_attrs)
1631                 return -ENODEV;
1632
1633         print_lustre_cfg(lcfg);
1634
1635         /*
1636          * e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1637          * or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1638          * or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36
1639          */
1640         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1641                 struct attribute *attr;
1642                 size_t keylen;
1643                 char *value;
1644                 char *key;
1645                 int j;
1646
1647                 key = lustre_cfg_buf(lcfg, i);
1648                 /* Strip off prefix */
1649                 if (class_match_param(key, prefix, &key))
1650                         /*
1651                          * If the prefix doesn't match, return error so we
1652                          * can pass it down the stack
1653                          */
1654                         return -EINVAL;
1655
1656                 value = strchr(key, '=');
1657                 if (!value || *(value + 1) == 0) {
1658                         CERROR("%s: can't parse param '%s' (missing '=')\n",
1659                                lustre_cfg_string(lcfg, 0),
1660                                lustre_cfg_string(lcfg, i));
1661                         /* continue parsing other params */
1662                         continue;
1663                 }
1664                 keylen = value - key;
1665                 value++;
1666
1667                 attr = NULL;
1668                 for (j = 0; typ->default_attrs[j]; j++) {
1669                         if (!strncmp(typ->default_attrs[j]->name, key,
1670                                      keylen)) {
1671                                 attr = typ->default_attrs[j];
1672                                 break;
1673                         }
1674                 }
1675
1676                 if (!attr) {
1677                         char *envp[4], *param, *path;
1678
1679                         path = kobject_get_path(kobj, GFP_KERNEL);
1680                         if (!path)
1681                                 return -EINVAL;
1682
1683                         /* convert sysfs path to uevent format */
1684                         param = path;
1685                         while ((param = strchr(param, '/')) != NULL)
1686                                 *param = '.';
1687
1688                         param = strstr(path, "fs.lustre.") + 10;
1689
1690                         envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s.%.*s",
1691                                             param, (int) keylen, key);
1692                         envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1693                         envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1694                                             ktime_get_real_seconds());
1695                         envp[3] = NULL;
1696
1697                         if (kobject_uevent_env(kobj, KOBJ_CHANGE, envp)) {
1698                                 CERROR("%s: failed to send uevent %s\n",
1699                                        kobject_name(kobj), key);
1700                         }
1701
1702                         for (i = 0; i < ARRAY_SIZE(envp); i++)
1703                                 kfree(envp[i]);
1704                         kfree(path);
1705                 } else {
1706                         count += lustre_attr_store(kobj, attr, value,
1707                                                    strlen(value));
1708                 }
1709         }
1710         return count;
1711 }
1712 EXPORT_SYMBOL(class_modify_config);
1713
1714 /*
1715  * Supplemental functions for config logs, it allocates lustre_cfg
1716  * buffers plus initialized llog record header at the beginning.
1717  */
1718 struct llog_cfg_rec *lustre_cfg_rec_new(int cmd, struct lustre_cfg_bufs *bufs)
1719 {
1720         struct llog_cfg_rec *lcr;
1721         int reclen;
1722
1723         ENTRY;
1724
1725         reclen = lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen);
1726         reclen = llog_data_len(reclen) + sizeof(struct llog_rec_hdr) +
1727                  sizeof(struct llog_rec_tail);
1728
1729         OBD_ALLOC(lcr, reclen);
1730         if (!lcr)
1731                 RETURN(NULL);
1732
1733         lustre_cfg_init(&lcr->lcr_cfg, cmd, bufs);
1734
1735         lcr->lcr_hdr.lrh_len = reclen;
1736         lcr->lcr_hdr.lrh_type = OBD_CFG_REC;
1737
1738         RETURN(lcr);
1739 }
1740 EXPORT_SYMBOL(lustre_cfg_rec_new);
1741
1742 void lustre_cfg_rec_free(struct llog_cfg_rec *lcr)
1743 {
1744         ENTRY;
1745         OBD_FREE(lcr, lcr->lcr_hdr.lrh_len);
1746         EXIT;
1747 }
1748 EXPORT_SYMBOL(lustre_cfg_rec_free);
1749
1750 /**
1751  * Parse a configuration llog, doing various manipulations on them
1752  * for various reasons, (modifications for compatibility, skip obsolete
1753  * records, change uuids, etc), then class_process_config() resulting
1754  * net records.
1755  */
1756 int class_config_llog_handler(const struct lu_env *env,
1757                               struct llog_handle *handle,
1758                               struct llog_rec_hdr *rec, void *data)
1759 {
1760         struct config_llog_instance *cfg = data;
1761         int cfg_len = rec->lrh_len;
1762         char *cfg_buf = (char *) (rec + 1);
1763         int rc = 0;
1764         ENTRY;
1765
1766         /* class_config_dump_handler(handle, rec, data); */
1767
1768         switch (rec->lrh_type) {
1769         case OBD_CFG_REC: {
1770                 struct lustre_cfg *lcfg, *lcfg_new;
1771                 struct lustre_cfg_bufs bufs;
1772                 char *inst_name = NULL;
1773                 int inst_len = 0;
1774                 int swab = 0;
1775
1776                 lcfg = (struct lustre_cfg *)cfg_buf;
1777                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1778                         lustre_swab_lustre_cfg(lcfg);
1779                         swab = 1;
1780                 }
1781
1782                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1783                 if (rc)
1784                         GOTO(out, rc);
1785
1786                 /* Figure out config state info */
1787                 if (lcfg->lcfg_command == LCFG_MARKER) {
1788                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1789                         lustre_swab_cfg_marker(marker, swab,
1790                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1791                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1792                                cfg->cfg_flags, marker->cm_flags);
1793                         if (marker->cm_flags & CM_START) {
1794                                 /* all previous flags off */
1795                                 cfg->cfg_flags = CFG_F_MARKER;
1796                                 server_name2index(marker->cm_tgtname,
1797                                                   &cfg->cfg_lwp_idx, NULL);
1798                                 if (marker->cm_flags & CM_SKIP) {
1799                                         cfg->cfg_flags |= CFG_F_SKIP;
1800                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1801                                                marker->cm_step);
1802                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1803                                            (cfg->cfg_sb &&
1804                                            lustre_check_exclusion(cfg->cfg_sb,
1805                                                         marker->cm_tgtname))) {
1806                                         cfg->cfg_flags |= CFG_F_EXCLUDE;
1807                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1808                                                marker->cm_step);
1809                                 }
1810                         } else if (marker->cm_flags & CM_END) {
1811                                 cfg->cfg_flags = 0;
1812                         }
1813                 }
1814                 /*
1815                  * A config command without a start marker before it is
1816                  * illegal
1817                  */
1818                 if (!(cfg->cfg_flags & CFG_F_MARKER) &&
1819                     (lcfg->lcfg_command != LCFG_MARKER)) {
1820                         CWARN("Skip config outside markers, (inst: %016lx, uuid: %s, flags: %#x)\n",
1821                                 cfg->cfg_instance,
1822                                 cfg->cfg_uuid.uuid, cfg->cfg_flags);
1823                         cfg->cfg_flags |= CFG_F_SKIP;
1824                 }
1825                 if (cfg->cfg_flags & CFG_F_SKIP) {
1826                         CDEBUG(D_CONFIG, "skipping %#x\n",
1827                                cfg->cfg_flags);
1828                         rc = 0;
1829                         /* No processing! */
1830                         break;
1831                 }
1832
1833                 /*
1834                  * For interoperability between 1.8 and 2.0,
1835                  * rename "mds" OBD device type to "mdt".
1836                  */
1837                 {
1838                         char *typename = lustre_cfg_string(lcfg, 1);
1839                         char *index = lustre_cfg_string(lcfg, 2);
1840
1841                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1842                             strcmp(typename, "mds") == 0)) {
1843                                 CWARN("For 1.8 interoperability, rename obd "
1844                                         "type from mds to mdt\n");
1845                                 typename[2] = 't';
1846                         }
1847                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1848                             strcmp(index, "type") == 0)) {
1849                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1850                                        "set this index to '0'\n");
1851                                 index[0] = '0';
1852                                 index[1] = 0;
1853                         }
1854                 }
1855
1856 #ifdef HAVE_SERVER_SUPPORT
1857                 /* newer MDS replaces LOV/OSC with LOD/OSP */
1858                 if ((lcfg->lcfg_command == LCFG_ATTACH ||
1859                      lcfg->lcfg_command == LCFG_SET_PARAM ||
1860                      lcfg->lcfg_command == LCFG_PARAM) &&
1861                     cfg->cfg_sb && IS_MDT(s2lsi(cfg->cfg_sb))) {
1862                         char *typename = lustre_cfg_string(lcfg, 1);
1863
1864                         if (typename &&
1865                             strcmp(typename, LUSTRE_LOV_NAME) == 0) {
1866                                 CDEBUG(D_CONFIG,
1867                                        "For 2.x interoperability, rename obd "
1868                                        "type from lov to lod (%s)\n",
1869                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1870                                 strcpy(typename, LUSTRE_LOD_NAME);
1871                         }
1872                         if (typename &&
1873                             strcmp(typename, LUSTRE_OSC_NAME) == 0) {
1874                                 CDEBUG(D_CONFIG,
1875                                        "For 2.x interoperability, rename obd "
1876                                        "type from osc to osp (%s)\n",
1877                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1878                                 strcpy(typename, LUSTRE_OSP_NAME);
1879                         }
1880                 }
1881 #endif /* HAVE_SERVER_SUPPORT */
1882
1883                 if (cfg->cfg_flags & CFG_F_EXCLUDE) {
1884                         CDEBUG(D_CONFIG, "cmd: %x marked EXCLUDED\n",
1885                                lcfg->lcfg_command);
1886                         if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD)
1887                                 /* Add inactive instead */
1888                                 lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1889                 }
1890
1891                 lustre_cfg_bufs_reset(&bufs, NULL);
1892                 lustre_cfg_bufs_init(&bufs, lcfg);
1893
1894                 if (cfg->cfg_instance &&
1895                     lcfg->lcfg_command != LCFG_SPTLRPC_CONF &&
1896                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
1897                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1898                                 LUSTRE_MAXINSTANCE + 4;
1899                         OBD_ALLOC(inst_name, inst_len);
1900                         if (!inst_name)
1901                                 GOTO(out, rc = -ENOMEM);
1902                         snprintf(inst_name, inst_len, "%s-%016lx",
1903                                 lustre_cfg_string(lcfg, 0),
1904                                 cfg->cfg_instance);
1905                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1906                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1907                                lcfg->lcfg_command, inst_name);
1908                 }
1909
1910                 /* override llog UUID for clients, to insure they are unique */
1911                 if (cfg->cfg_instance && lcfg->lcfg_command == LCFG_ATTACH)
1912                         lustre_cfg_bufs_set_string(&bufs, 2,
1913                                                    cfg->cfg_uuid.uuid);
1914                 /*
1915                  * sptlrpc config record, we expect 2 data segments:
1916                  *  [0]: fs_name/target_name,
1917                  *  [1]: rule string
1918                  * moving them to index [1] and [2], and insert MGC's
1919                  * obdname at index [0].
1920                  */
1921                 if (cfg->cfg_instance &&
1922                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1923                         /* After ASLR changes cfg_instance this needs fixing */
1924                         /* "obd" is set in config_log_find_or_add() */
1925                         struct obd_device *obd = (void *)cfg->cfg_instance;
1926
1927                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1928                                             bufs.lcfg_buflen[1]);
1929                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1930                                             bufs.lcfg_buflen[0]);
1931                         lustre_cfg_bufs_set_string(&bufs, 0,
1932                                                    obd->obd_name);
1933                 }
1934
1935                 /*
1936                  * Add net info to setup command
1937                  * if given on command line.
1938                  * So config log will be:
1939                  * [0]: client name
1940                  * [1]: client UUID
1941                  * [2]: server UUID
1942                  * [3]: inactive-on-startup
1943                  * [4]: restrictive net
1944                  */
1945                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1946                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1947                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1948                         char *nidnet = lsi->lsi_lmd->lmd_nidnet;
1949
1950                         if (lcfg->lcfg_command == LCFG_SETUP &&
1951                             lcfg->lcfg_bufcount != 2 && nidnet) {
1952                                 CDEBUG(D_CONFIG, "Adding net %s info to setup "
1953                                        "command for client %s\n", nidnet,
1954                                        lustre_cfg_string(lcfg, 0));
1955                                 lustre_cfg_bufs_set_string(&bufs, 4, nidnet);
1956                         }
1957                 }
1958
1959                 /*
1960                  * Skip add_conn command if uuid is
1961                  * not on restricted net
1962                  */
1963                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1964                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1965                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1966                         char *uuid_str = lustre_cfg_string(lcfg, 1);
1967
1968                         if (lcfg->lcfg_command == LCFG_ADD_CONN &&
1969                             lsi->lsi_lmd->lmd_nidnet &&
1970                             LNET_NIDNET(libcfs_str2nid(uuid_str)) !=
1971                             libcfs_str2net(lsi->lsi_lmd->lmd_nidnet)) {
1972                                 CDEBUG(D_CONFIG, "skipping add_conn for %s\n",
1973                                        uuid_str);
1974                                 rc = 0;
1975                                 /* No processing! */
1976                                 break;
1977                         }
1978                 }
1979
1980                 OBD_ALLOC(lcfg_new, lustre_cfg_len(bufs.lcfg_bufcount,
1981                                                    bufs.lcfg_buflen));
1982                 if (!lcfg_new)
1983                         GOTO(out, rc = -ENOMEM);
1984
1985                 lustre_cfg_init(lcfg_new, lcfg->lcfg_command, &bufs);
1986                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1987                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1988
1989                 /*
1990                  * XXX Hack to try to remain binary compatible with
1991                  * pre-newconfig logs
1992                  */
1993                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1994                     (lcfg->lcfg_nid >> 32) == 0) {
1995                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1996
1997                         lcfg_new->lcfg_nid =
1998                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1999                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
2000                               lcfg->lcfg_nal, addr,
2001                               libcfs_nid2str(lcfg_new->lcfg_nid));
2002                 } else {
2003                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
2004                 }
2005
2006                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
2007
2008                 rc = class_process_config(lcfg_new);
2009                 OBD_FREE(lcfg_new, lustre_cfg_len(lcfg_new->lcfg_bufcount,
2010                                                   lcfg_new->lcfg_buflens));
2011                 if (inst_name)
2012                         OBD_FREE(inst_name, inst_len);
2013                 break;
2014         }
2015         default:
2016                 CERROR("Unknown llog record type %#x encountered\n",
2017                        rec->lrh_type);
2018                 break;
2019         }
2020 out:
2021         if (rc) {
2022                 CERROR("%s: cfg command failed: rc = %d\n",
2023                         handle->lgh_ctxt->loc_obd->obd_name, rc);
2024                 class_config_dump_handler(NULL, handle, rec, data);
2025         }
2026         RETURN(rc);
2027 }
2028 EXPORT_SYMBOL(class_config_llog_handler);
2029
2030 int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
2031                             char *name, struct config_llog_instance *cfg)
2032 {
2033         struct llog_process_cat_data cd = {
2034                 .lpcd_first_idx = 0,
2035                 .lpcd_read_mode = LLOG_READ_MODE_NORMAL,
2036         };
2037         struct llog_handle *llh;
2038         llog_cb_t callback;
2039         int rc;
2040         ENTRY;
2041
2042         CDEBUG(D_INFO, "looking up llog %s\n", name);
2043         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
2044         if (rc)
2045                 RETURN(rc);
2046
2047         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
2048         if (rc)
2049                 GOTO(parse_out, rc);
2050
2051         /* continue processing from where we last stopped to end-of-log */
2052         if (cfg) {
2053                 cd.lpcd_first_idx = cfg->cfg_last_idx;
2054                 callback = cfg->cfg_callback;
2055                 LASSERT(callback != NULL);
2056         } else {
2057                 callback = class_config_llog_handler;
2058         }
2059
2060         cd.lpcd_last_idx = 0;
2061
2062         rc = llog_process(env, llh, callback, cfg, &cd);
2063
2064         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
2065                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
2066         if (cfg)
2067                 cfg->cfg_last_idx = cd.lpcd_last_idx;
2068
2069 parse_out:
2070         llog_close(env, llh);
2071         RETURN(rc);
2072 }
2073 EXPORT_SYMBOL(class_config_parse_llog);
2074
2075 /**
2076  * Get marker cfg_flag
2077  */
2078 void llog_get_marker_cfg_flags(struct llog_rec_hdr *rec,
2079                                unsigned int *cfg_flags)
2080 {
2081         struct lustre_cfg *lcfg = (struct lustre_cfg *)(rec + 1);
2082         struct cfg_marker *marker;
2083
2084         if (lcfg->lcfg_command == LCFG_MARKER) {
2085                 marker = lustre_cfg_buf(lcfg, 1);
2086                 if (marker->cm_flags & CM_START) {
2087                         *cfg_flags = CFG_F_MARKER;
2088                         if (marker->cm_flags & CM_SKIP)
2089                                 *cfg_flags = CFG_F_SKIP;
2090                 } else if (marker->cm_flags & CM_END) {
2091                         *cfg_flags = 0;
2092                 }
2093                 CDEBUG(D_INFO, "index=%d, cm_flags=%#08x cfg_flags=%#08x\n",
2094                        rec->lrh_index, marker->cm_flags, *cfg_flags);
2095         }
2096 }
2097
2098 /**
2099  * Parse config record and output dump in supplied buffer.
2100  *
2101  * This is separated from class_config_dump_handler() to use
2102  * for ioctl needs as well
2103  *
2104  * Sample Output:
2105  * - { index: 4, event: attach, device: lustrewt-clilov, type: lov,
2106  *     UUID: lustrewt-clilov_UUID }
2107  */
2108 int class_config_yaml_output(struct llog_rec_hdr *rec, char *buf, int size,
2109                              unsigned int *cfg_flags, bool raw)
2110 {
2111         struct lustre_cfg *lcfg = (struct lustre_cfg *)(rec + 1);
2112         char *ptr = buf;
2113         char *end = buf + size;
2114         int rc = 0, i;
2115         struct lcfg_type_data *ldata;
2116         int swab = 0;
2117
2118         LASSERT(rec->lrh_type == OBD_CFG_REC);
2119
2120         if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
2121                 lustre_swab_lustre_cfg(lcfg);
2122                 swab = 1;
2123         }
2124
2125         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2126         if (rc < 0)
2127                 return rc;
2128
2129         ldata = lcfg_cmd2data(lcfg->lcfg_command);
2130         if (!ldata)
2131                 return -ENOTTY;
2132
2133         llog_get_marker_cfg_flags(rec, cfg_flags);
2134         if ((lcfg->lcfg_command == LCFG_MARKER) && likely(!raw))
2135                 return 0;
2136         /* entries outside marker are skipped */
2137         if (!(*cfg_flags & CFG_F_MARKER) && !raw)
2138                 return 0;
2139         /* inside skipped marker */
2140         if ((*cfg_flags & CFG_F_SKIP) && !raw)
2141                 return 0;
2142
2143         /* form YAML entity */
2144         ptr += snprintf(ptr, end - ptr, "- { index: %u, event: %s",
2145                         rec->lrh_index, ldata->ltd_name);
2146         if (end - ptr <= 0)
2147                 goto out_overflow;
2148
2149         if (lcfg->lcfg_flags) {
2150                 ptr += snprintf(ptr, end - ptr, ", flags: %#08x",
2151                                 lcfg->lcfg_flags);
2152                 if (end - ptr <= 0)
2153                         goto out_overflow;
2154         }
2155         if (lcfg->lcfg_num) {
2156                 ptr += snprintf(ptr, end - ptr, ", num: %#08x",
2157                                 lcfg->lcfg_num);
2158                 if (end - ptr <= 0)
2159                         goto out_overflow;
2160         }
2161         if (lcfg->lcfg_nid) {
2162                 char nidstr[LNET_NIDSTR_SIZE];
2163
2164                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2165                 ptr += snprintf(ptr, end - ptr, ", nid: %s(%#llx)",
2166                                 nidstr, lcfg->lcfg_nid);
2167                 if (end - ptr <= 0)
2168                         goto out_overflow;
2169         }
2170
2171         if (LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
2172                 ptr += snprintf(ptr, end - ptr, ", device: %s",
2173                                 lustre_cfg_string(lcfg, 0));
2174                 if (end - ptr <= 0)
2175                         goto out_overflow;
2176         }
2177
2178         if (lcfg->lcfg_command == LCFG_SET_PARAM) {
2179                 /*
2180                  * set_param -P parameters have param=val here, separate
2181                  * them through pointer magic and print them out in
2182                  * native yamlese
2183                  */
2184                 char *cfg_str = lustre_cfg_string(lcfg, 1);
2185                 char *tmp = strchr(cfg_str, '=');
2186                 size_t len;
2187
2188                 if (!tmp)
2189                         goto out_done;
2190
2191                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[0]);
2192                 len = tmp - cfg_str + 1;
2193                 snprintf(ptr, len, "%s", cfg_str);
2194                 ptr += len - 1;
2195
2196                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[1]);
2197                 ptr += snprintf(ptr, end - ptr, "%s", tmp + 1);
2198
2199                 goto out_done;
2200         }
2201
2202         if (lcfg->lcfg_command == LCFG_MARKER) {
2203                 struct cfg_marker *marker;
2204
2205                 marker = lustre_cfg_buf(lcfg, 1);
2206                 ptr += snprintf(ptr, end - ptr, ", flags: %#04x",
2207                                 marker->cm_flags);
2208                 ptr += snprintf(ptr, end - ptr, ", version: %d.%d.%d.%d",
2209                                 OBD_OCD_VERSION_MAJOR(marker->cm_vers),
2210                                 OBD_OCD_VERSION_MINOR(marker->cm_vers),
2211                                 OBD_OCD_VERSION_PATCH(marker->cm_vers),
2212                                 OBD_OCD_VERSION_FIX(marker->cm_vers));
2213                 ptr += snprintf(ptr, end - ptr, ", createtime: %lld",
2214                                 marker->cm_createtime);
2215                 ptr += snprintf(ptr, end - ptr, ", canceltime: %lld",
2216                                 marker->cm_canceltime);
2217
2218                 goto out_done;
2219         }
2220
2221         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
2222                 if (LUSTRE_CFG_BUFLEN(lcfg, i) > 0) {
2223                         ptr += snprintf(ptr, end - ptr, ", %s: %s",
2224                                         ldata->ltd_bufs[i - 1],
2225                                         lustre_cfg_string(lcfg, i));
2226                         if (end - ptr <= 0)
2227                                 goto out_overflow;
2228                 }
2229         }
2230
2231 out_done:
2232         ptr += snprintf(ptr, end - ptr, " }\n");
2233 out_overflow:
2234         /* Return consumed bytes.  If the buffer overflowed, zero last byte */
2235         rc = ptr - buf;
2236         if (rc > size) {
2237                 rc = -EOVERFLOW;
2238                 *(end - 1) = '\0';
2239         }
2240
2241         return rc;
2242 }
2243
2244 /**
2245  * parse config record and output dump in supplied buffer.
2246  * This is separated from class_config_dump_handler() to use
2247  * for ioctl needs as well
2248  */
2249 static int class_config_parse_rec(struct llog_rec_hdr *rec, char *buf, int size)
2250 {
2251         struct lustre_cfg       *lcfg = (struct lustre_cfg *)(rec + 1);
2252         char                    *ptr = buf;
2253         char                    *end = buf + size;
2254         int                      rc = 0;
2255
2256         ENTRY;
2257
2258         LASSERT(rec->lrh_type == OBD_CFG_REC);
2259         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2260         if (rc < 0)
2261                 RETURN(rc);
2262
2263         ptr += snprintf(ptr, end-ptr, "cmd=%05x ", lcfg->lcfg_command);
2264         if (lcfg->lcfg_flags)
2265                 ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
2266                                 lcfg->lcfg_flags);
2267
2268         if (lcfg->lcfg_num)
2269                 ptr += snprintf(ptr, end-ptr, "num=%#08x ", lcfg->lcfg_num);
2270
2271         if (lcfg->lcfg_nid) {
2272                 char nidstr[LNET_NIDSTR_SIZE];
2273
2274                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2275                 ptr += snprintf(ptr, end-ptr, "nid=%s(%#llx)    ",
2276                                 nidstr, lcfg->lcfg_nid);
2277         }
2278
2279         if (lcfg->lcfg_command == LCFG_MARKER) {
2280                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
2281
2282                 ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
2283                                 marker->cm_step, marker->cm_flags,
2284                                 marker->cm_tgtname, marker->cm_comment);
2285         } else {
2286                 int i;
2287
2288                 for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
2289                         ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
2290                                         lustre_cfg_string(lcfg, i));
2291                 }
2292         }
2293         ptr += snprintf(ptr, end - ptr, "\n");
2294         /* return consumed bytes */
2295         rc = ptr - buf;
2296         RETURN(rc);
2297 }
2298
2299 int class_config_dump_handler(const struct lu_env *env,
2300                               struct llog_handle *handle,
2301                               struct llog_rec_hdr *rec, void *data)
2302 {
2303         char *outstr;
2304         int rc = 0;
2305
2306         ENTRY;
2307
2308         OBD_ALLOC(outstr, 256);
2309         if (!outstr)
2310                 RETURN(-ENOMEM);
2311
2312         if (rec->lrh_type == OBD_CFG_REC) {
2313                 class_config_parse_rec(rec, outstr, 256);
2314                 LCONSOLE(D_WARNING, "   %s\n", outstr);
2315         } else {
2316                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
2317                 rc = -EINVAL;
2318         }
2319
2320         OBD_FREE(outstr, 256);
2321         RETURN(rc);
2322 }
2323
2324 /**
2325  * Call class_cleanup and class_detach.
2326  * "Manual" only in the sense that we're faking lcfg commands.
2327  */
2328 int class_manual_cleanup(struct obd_device *obd)
2329 {
2330         char flags[3] = "";
2331         struct lustre_cfg *lcfg;
2332         struct lustre_cfg_bufs bufs;
2333         int rc;
2334
2335         ENTRY;
2336
2337         if (!obd) {
2338                 CERROR("empty cleanup\n");
2339                 RETURN(-EALREADY);
2340         }
2341
2342         if (obd->obd_force)
2343                 strlcat(flags, "F", sizeof(flags));
2344         if (obd->obd_fail)
2345                 strlcat(flags, "A", sizeof(flags));
2346
2347         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
2348                obd->obd_name, flags);
2349
2350         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
2351         lustre_cfg_bufs_set_string(&bufs, 1, flags);
2352         OBD_ALLOC(lcfg, lustre_cfg_len(bufs.lcfg_bufcount, bufs.lcfg_buflen));
2353         if (!lcfg)
2354                 RETURN(-ENOMEM);
2355         lustre_cfg_init(lcfg, LCFG_CLEANUP, &bufs);
2356
2357         rc = class_process_config(lcfg);
2358         if (rc) {
2359                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
2360                 GOTO(out, rc);
2361         }
2362
2363         /* the lcfg is almost the same for both ops */
2364         lcfg->lcfg_command = LCFG_DETACH;
2365         rc = class_process_config(lcfg);
2366         if (rc)
2367                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
2368 out:
2369         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
2370         RETURN(rc);
2371 }
2372 EXPORT_SYMBOL(class_manual_cleanup);
2373
2374 #ifdef HAVE_SERVER_SUPPORT
2375 /*
2376  * nid<->nidstats hash operations
2377  */
2378 static unsigned
2379 nidstats_hash(struct cfs_hash *hs, const void *key, unsigned int mask)
2380 {
2381         return cfs_hash_djb2_hash(key, sizeof(struct lnet_nid), mask);
2382 }
2383
2384 static void *
2385 nidstats_key(struct hlist_node *hnode)
2386 {
2387         struct nid_stat *ns;
2388
2389         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2390
2391         return &ns->nid;
2392 }
2393
2394 static int
2395 nidstats_keycmp(const void *key, struct hlist_node *hnode)
2396 {
2397         return nid_same((struct lnet_nid *)nidstats_key(hnode),
2398                          (struct lnet_nid *)key);
2399 }
2400
2401 static void *
2402 nidstats_object(struct hlist_node *hnode)
2403 {
2404         return hlist_entry(hnode, struct nid_stat, nid_hash);
2405 }
2406
2407 static void
2408 nidstats_get(struct cfs_hash *hs, struct hlist_node *hnode)
2409 {
2410         struct nid_stat *ns;
2411
2412         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2413         nidstat_getref(ns);
2414 }
2415
2416 static void
2417 nidstats_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2418 {
2419         struct nid_stat *ns;
2420
2421         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2422         nidstat_putref(ns);
2423 }
2424
2425 static struct cfs_hash_ops nid_stat_hash_ops = {
2426         .hs_hash        = nidstats_hash,
2427         .hs_key         = nidstats_key,
2428         .hs_keycmp      = nidstats_keycmp,
2429         .hs_object      = nidstats_object,
2430         .hs_get         = nidstats_get,
2431         .hs_put_locked  = nidstats_put_locked,
2432 };
2433
2434 /*
2435  * client_generation<->export hash operations
2436  */
2437
2438 static unsigned
2439 gen_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2440 {
2441         return cfs_hash_djb2_hash(key, sizeof(__u32), mask);
2442 }
2443
2444 static void *
2445 gen_key(struct hlist_node *hnode)
2446 {
2447         struct obd_export *exp;
2448
2449         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2450
2451         RETURN(&exp->exp_target_data.ted_lcd->lcd_generation);
2452 }
2453
2454 /*
2455  * NOTE: It is impossible to find an export that is in failed
2456  *       state with this function
2457  */
2458 static int
2459 gen_kepcmp(const void *key, struct hlist_node *hnode)
2460 {
2461         struct obd_export *exp;
2462
2463         LASSERT(key);
2464         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2465
2466         RETURN(exp->exp_target_data.ted_lcd->lcd_generation == *(__u32 *)key &&
2467                !exp->exp_failed);
2468 }
2469
2470 static void *
2471 gen_export_object(struct hlist_node *hnode)
2472 {
2473         return hlist_entry(hnode, struct obd_export, exp_gen_hash);
2474 }
2475
2476 static void
2477 gen_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
2478 {
2479         struct obd_export *exp;
2480
2481         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2482         class_export_get(exp);
2483 }
2484
2485 static void
2486 gen_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2487 {
2488         struct obd_export *exp;
2489
2490         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2491         class_export_put(exp);
2492 }
2493
2494 static struct cfs_hash_ops gen_hash_ops = {
2495         .hs_hash        = gen_hash,
2496         .hs_key         = gen_key,
2497         .hs_keycmp      = gen_kepcmp,
2498         .hs_object      = gen_export_object,
2499         .hs_get         = gen_export_get,
2500         .hs_put_locked  = gen_export_put_locked,
2501 };
2502
2503 #endif /* HAVE_SERVER_SUPPORT */