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_nid4(char *buf, void *value, int quiet)
 412 {
 413         lnet_nid_t *nid4 = (lnet_nid_t *)value;
 414
 415         *nid4 = libcfs_str2nid(buf);
 416         if (*nid4 != 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_nid(char *buf, void *value, int quiet)
 425 {
 426         struct lnet_nid *nid = value;
 427
 428         if (libcfs_strnid(nid, buf) == 0)
 429                 return 0;
 430
 431         if (!quiet)
 432                 LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
 433         return -EINVAL;
 434 }
 435
 436 static int parse_net(char *buf, void *value)
 437 {
 438         __u32 *net = (__u32 *)value;
 439
 440         *net = libcfs_str2net(buf);
 441         CDEBUG(D_INFO, "Net %s\n", libcfs_net2str(*net));
 442         return 0;
 443 }
 444
 445 enum {
 446         CLASS_PARSE_NID4 = 1,
 447         CLASS_PARSE_NID,
 448         CLASS_PARSE_NET,
 449 };
 450
 451 /*
 452  * 0 is good NID,
 453  * 1 not found
 454  * < 0 error
 455  * endh is set to next separator
 456  */
 457 static int class_parse_value(char *buf, int opc, void *value, char **endh,
 458                              int quiet)
 459 {
 460         char *endp;
 461         char  tmp;
 462         int   rc = 0;
 463
 464         if (!buf)
 465                 return 1;
 466         while (*buf == ',' || *buf == ':')
 467                 buf++;
 468         if (*buf == ' ' || *buf == '/' || *buf == '\0')
 469                 return 1;
 470
 471         /* NID separators or end of NIDs */
 472         endp = strpbrk(buf, ",: /");
 473         if (!endp)
 474                 endp = buf + strlen(buf);
 475
 476         tmp = *endp;
 477         *endp = '\0';
 478         switch (opc) {
 479         default:
 480                 LBUG();
 481         case CLASS_PARSE_NID4:
 482                 rc = parse_nid4(buf, value, quiet);
 483                 break;
 484         case CLASS_PARSE_NID:
 485                 rc = parse_nid(buf, value, quiet);
 486                 break;
 487         case CLASS_PARSE_NET:
 488                 rc = parse_net(buf, value);
 489                 break;
 490         }
 491         *endp = tmp;
 492         if (rc != 0)
 493                 return rc;
 494         if (endh)
 495                 *endh = endp;
 496         return 0;
 497 }
 498
 499 int class_parse_nid4(char *buf, lnet_nid_t *nid4, char **endh)
 500 {
 501         return class_parse_value(buf, CLASS_PARSE_NID4, (void *)nid4, endh, 0);
 502 }
 503 EXPORT_SYMBOL(class_parse_nid4);
 504
 505 int class_parse_nid4_quiet(char *buf, lnet_nid_t *nid4, char **endh)
 506 {
 507         return class_parse_value(buf, CLASS_PARSE_NID4, (void *)nid4, endh, 1);
 508 }
 509 EXPORT_SYMBOL(class_parse_nid4_quiet);
 510
 511 int class_parse_nid(char *buf, struct lnet_nid *nid, char **endh)
 512 {
 513         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 0);
 514 }
 515 EXPORT_SYMBOL(class_parse_nid);
 516
 517 int class_parse_nid_quiet(char *buf, struct lnet_nid *nid, char **endh)
 518 {
 519         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 1);
 520 }
 521 EXPORT_SYMBOL(class_parse_nid_quiet);
 522
 523 int class_parse_net(char *buf, __u32 *net, char **endh)
 524 {
 525         return class_parse_value(buf, CLASS_PARSE_NET, (void *)net, endh, 0);
 526 }
 527
 528 /*
 529  * 1 param contains key and match
 530  * 0 param contains key and not match
 531  * -1 param does not contain key
 532  */
 533 int class_match_nid(char *buf, char *key, lnet_nid_t nid)
 534 {
 535         lnet_nid_t tmp;
 536         int rc = -1;
 537
 538         while (class_find_param(buf, key, &buf) == 0) {
 539                 /*
 540                  * please restrict to the NIDs pertaining to
 541                  * the specified NIDs
 542                  */
 543                 while (class_parse_nid4(buf, &tmp, &buf) == 0) {
 544                         if (tmp == nid)
 545                                 return 1;
 546                 }
 547                 rc = 0;
 548         }
 549         return rc;
 550 }
 551 EXPORT_SYMBOL(class_match_nid);
 552
 553 int class_match_net(char *buf, char *key, __u32 net)
 554 {
 555         __u32 tmp;
 556         int rc = -1;
 557
 558         while (class_find_param(buf, key, &buf) == 0) {
 559                 /*
 560                  * please restrict to the NIDs pertaining to
 561                  * the specified networks
 562                  */
 563                 while (class_parse_net(buf, &tmp, &buf) == 0) {
 564                         if (tmp == net)
 565                                 return 1;
 566                 }
 567                 rc = 0;
 568         }
 569         return rc;
 570 }
 571 EXPORT_SYMBOL(class_match_net);
 572
 573 char *lustre_cfg_string(struct lustre_cfg *lcfg, u32 index)
 574 {
 575         char *s;
 576
 577         if (!lcfg->lcfg_buflens[index])
 578                 return NULL;
 579
 580         s = lustre_cfg_buf(lcfg, index);
 581         if (!s)
 582                 return NULL;
 583
 584         /*
 585          * make sure it's NULL terminated, even if this kills a char
 586          * of data.  Try to use the padding first though.
 587          */
 588         if (s[lcfg->lcfg_buflens[index] - 1] != '\0') {
 589                 size_t last = ALIGN(lcfg->lcfg_buflens[index], 8) - 1;
 590                 char lost;
 591
 592                 /* Use the smaller value */
 593                 if (last > lcfg->lcfg_buflens[index])
 594                         last = lcfg->lcfg_buflens[index];
 595
 596                 lost = s[last];
 597                 s[last] = '\0';
 598                 if (lost != '\0') {
 599                         CWARN("Truncated buf %d to '%s' (lost '%c'...)\n",
 600                               index, s, lost);
 601                 }
 602         }
 603         return s;
 604 }
 605 EXPORT_SYMBOL(lustre_cfg_string);
 606
 607 /********************** class fns **********************/
 608
 609 /**
 610  * Create a new OBD device and set the type, name and uuid.  If successful,
 611  * the new device can be accessed by either name or uuid.
 612  */
 613 int class_attach(struct lustre_cfg *lcfg)
 614 {
 615         struct obd_export *exp;
 616         struct obd_device *obd = NULL;
 617         char *typename, *name, *uuid;
 618         int rc, len;
 619
 620         ENTRY;
 621
 622         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 623                 CERROR("No type passed!\n");
 624                 RETURN(-EINVAL);
 625         }
 626         typename = lustre_cfg_string(lcfg, 1);
 627
 628         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 629                 CERROR("No name passed!\n");
 630                 RETURN(-EINVAL);
 631         }
 632         name = lustre_cfg_string(lcfg, 0);
 633         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 634                 CERROR("No UUID passed!\n");
 635                 RETURN(-EINVAL);
 636         }
 637
 638         uuid = lustre_cfg_string(lcfg, 2);
 639         len = strlen(uuid);
 640         if (len >= sizeof(obd->obd_uuid)) {
 641                 CERROR("%s: uuid must be < %d bytes long\n",
 642                        name, (int)sizeof(obd->obd_uuid));
 643                 RETURN(-EINVAL);
 644         }
 645
 646         obd = class_newdev(typename, name, uuid);
 647         if (IS_ERR(obd)) { /* Already exists or out of obds */
 648                 rc = PTR_ERR(obd);
 649                 CERROR("Cannot create device %s of type %s : %d\n",
 650                        name, typename, rc);
 651                 RETURN(rc);
 652         }
 653         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 654                  "obd %p obd_magic %08X != %08X\n",
 655                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 656         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 657                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 658
 659         exp = class_new_export_self(obd, &obd->obd_uuid);
 660         if (IS_ERR(exp)) {
 661                 rc = PTR_ERR(exp);
 662                 class_free_dev(obd);
 663                 RETURN(rc);
 664         }
 665
 666         obd->obd_self_export = exp;
 667         list_del_init(&exp->exp_obd_chain_timed);
 668         class_export_put(exp);
 669
 670         rc = class_register_device(obd);
 671         if (rc != 0) {
 672                 class_decref(obd, "newdev", obd);
 673                 RETURN(rc);
 674         }
 675
 676         obd->obd_attached = 1;
 677         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 678                obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
 679
 680         RETURN(0);
 681 }
 682 EXPORT_SYMBOL(class_attach);
 683
 684 /**
 685  * Create hashes, self-export, and call type-specific setup.
 686  * Setup is effectively the "start this obd" call.
 687  */
 688 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 689 {
 690         int err = 0;
 691
 692         ENTRY;
 693
 694         LASSERT(obd != NULL);
 695         LASSERTF(obd == class_num2obd(obd->obd_minor),
 696                  "obd %p != obd_devs[%d] %p\n",
 697                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 698         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 699                  "obd %p obd_magic %08x != %08x\n",
 700                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 701
 702         /* have we attached a type to this device? */
 703         if (!obd->obd_attached) {
 704                 CERROR("Device %d not attached\n", obd->obd_minor);
 705                 RETURN(-ENODEV);
 706         }
 707
 708         if (obd->obd_set_up) {
 709                 CERROR("Device %d already setup (type %s)\n",
 710                        obd->obd_minor, obd->obd_type->typ_name);
 711                 RETURN(-EEXIST);
 712         }
 713
 714         /* is someone else setting us up right now? (attach inits spinlock) */
 715         spin_lock(&obd->obd_dev_lock);
 716         if (obd->obd_starting) {
 717                 spin_unlock(&obd->obd_dev_lock);
 718                 CERROR("Device %d setup in progress (type %s)\n",
 719                        obd->obd_minor, obd->obd_type->typ_name);
 720                 RETURN(-EEXIST);
 721         }
 722         /*
 723          * just leave this on forever.  I can't use obd_set_up here because
 724          * other fns check that status, and we're not actually set up yet.
 725          */
 726         obd->obd_starting = 1;
 727         obd->obd_nid_stats_hash = NULL;
 728         obd->obd_gen_hash = NULL;
 729         spin_unlock(&obd->obd_dev_lock);
 730
 731         /* create an uuid-export lustre hash */
 732         err = rhashtable_init(&obd->obd_uuid_hash, &uuid_hash_params);
 733         if (err)
 734                 GOTO(err_starting, err);
 735
 736 #ifdef HAVE_SERVER_SUPPORT
 737         /* create a nid-export lustre hash */
 738         err = rhltable_init(&obd->obd_nid_hash, &nid_hash_params);
 739         if (err)
 740                 GOTO(err_uuid_hash, err = -ENOMEM);
 741
 742         /* create a nid-stats lustre hash */
 743         obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
 744                                                   HASH_NID_STATS_CUR_BITS,
 745                                                   HASH_NID_STATS_MAX_BITS,
 746                                                   HASH_NID_STATS_BKT_BITS, 0,
 747                                                   CFS_HASH_MIN_THETA,
 748                                                   CFS_HASH_MAX_THETA,
 749                                                   &nid_stat_hash_ops,
 750                                                   CFS_HASH_DEFAULT);
 751         if (!obd->obd_nid_stats_hash)
 752                 GOTO(err_nid_hash, err = -ENOMEM);
 753
 754         /* create a client_generation-export lustre hash */
 755         obd->obd_gen_hash = cfs_hash_create("UUID_HASH",
 756                                             HASH_GEN_CUR_BITS,
 757                                             HASH_GEN_MAX_BITS,
 758                                             HASH_GEN_BKT_BITS, 0,
 759                                             CFS_HASH_MIN_THETA,
 760                                             CFS_HASH_MAX_THETA,
 761                                             &gen_hash_ops, CFS_HASH_DEFAULT);
 762         if (!obd->obd_gen_hash)
 763                 GOTO(err_nid_stats_hash, err = -ENOMEM);
 764 #endif /* HAVE_SERVER_SUPPORT */
 765
 766         err = obd_setup(obd, lcfg);
 767         if (err)
 768 #ifdef HAVE_SERVER_SUPPORT
 769                 GOTO(err_gen_hash, err);
 770 #else
 771                 GOTO(err_uuid_hash, err);
 772 #endif /* ! HAVE_SERVER_SUPPORT */
 773
 774         obd->obd_set_up = 1;
 775
 776         spin_lock(&obd->obd_dev_lock);
 777         /* cleanup drops this */
 778         class_incref(obd, "setup", obd);
 779         spin_unlock(&obd->obd_dev_lock);
 780
 781         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 782                obd->obd_name, obd->obd_uuid.uuid);
 783
 784         RETURN(0);
 785
 786 #ifdef HAVE_SERVER_SUPPORT
 787 err_gen_hash:
 788         if (obd->obd_gen_hash) {
 789                 cfs_hash_putref(obd->obd_gen_hash);
 790                 obd->obd_gen_hash = NULL;
 791         }
 792 err_nid_stats_hash:
 793         if (obd->obd_nid_stats_hash) {
 794                 cfs_hash_putref(obd->obd_nid_stats_hash);
 795                 obd->obd_nid_stats_hash = NULL;
 796         }
 797 err_nid_hash:
 798         rhltable_destroy(&obd->obd_nid_hash);
 799 #endif /* HAVE_SERVER_SUPPORT */
 800 err_uuid_hash:
 801         rhashtable_destroy(&obd->obd_uuid_hash);
 802 err_starting:
 803         obd->obd_starting = 0;
 804         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 805         return err;
 806 }
 807 EXPORT_SYMBOL(class_setup);
 808
 809 /**
 810  * We have finished using this OBD and are ready to destroy it.
 811  * There can be no more references to this obd.
 812  */
 813 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 814 {
 815         ENTRY;
 816
 817         if (obd->obd_set_up) {
 818                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 819                 RETURN(-EBUSY);
 820         }
 821
 822         spin_lock(&obd->obd_dev_lock);
 823         if (!obd->obd_attached) {
 824                 spin_unlock(&obd->obd_dev_lock);
 825                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 826                 RETURN(-ENODEV);
 827         }
 828         obd->obd_attached = 0;
 829         spin_unlock(&obd->obd_dev_lock);
 830
 831         /* cleanup in progress. we don't like to find this device after now */
 832         class_unregister_device(obd);
 833
 834         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 835                obd->obd_name, obd->obd_uuid.uuid);
 836
 837         class_decref(obd, "newdev", obd);
 838
 839         RETURN(0);
 840 }
 841 EXPORT_SYMBOL(class_detach);
 842
 843 /**
 844  * Start shutting down the OBD.  There may be in-progess ops when
 845  * this is called.  We tell them to start shutting down with a call
 846  * to class_disconnect_exports().
 847  */
 848 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 849 {
 850         int err = 0;
 851         char *flag;
 852         ENTRY;
 853
 854         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 855
 856         if (!obd->obd_set_up) {
 857                 CERROR("Device %d not setup\n", obd->obd_minor);
 858                 RETURN(-ENODEV);
 859         }
 860
 861         spin_lock(&obd->obd_dev_lock);
 862         if (obd->obd_stopping) {
 863                 spin_unlock(&obd->obd_dev_lock);
 864                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 865                 RETURN(-ENODEV);
 866         }
 867         /* Leave this on forever */
 868         obd->obd_stopping = 1;
 869         spin_unlock(&obd->obd_dev_lock);
 870
 871         /* wait for already-arrived-connections to finish. */
 872         while (obd->obd_conn_inprogress > 0)
 873                 yield();
 874         smp_rmb();
 875
 876         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 877                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 878                         switch (*flag) {
 879                         case 'F':
 880                                 obd->obd_force = 1;
 881                                 break;
 882                         case 'A':
 883                                 LCONSOLE_WARN("Failing over %s\n",
 884                                               obd->obd_name);
 885                                 spin_lock(&obd->obd_dev_lock);
 886                                 obd->obd_fail = 1;
 887 #ifdef HAVE_SERVER_SUPPORT
 888                                 obd->obd_no_transno = 1;
 889 #endif
 890                                 obd->obd_no_recov = 1;
 891                                 spin_unlock(&obd->obd_dev_lock);
 892                                 if (OBP(obd, iocontrol)) {
 893                                         obd_iocontrol(OBD_IOC_SYNC,
 894                                                       obd->obd_self_export,
 895                                                       0, NULL, NULL);
 896                                 }
 897                                 break;
 898                         default:
 899                                 CERROR("Unrecognised flag '%c'\n", *flag);
 900                         }
 901         }
 902
 903         LASSERT(obd->obd_self_export);
 904
 905         CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d/%d\n",
 906                obd->obd_name, obd->obd_num_exports,
 907                atomic_read(&obd->obd_refcount) - 2);
 908         dump_exports(obd, 0, D_HA);
 909         class_disconnect_exports(obd);
 910
 911         /* Precleanup, we must make sure all exports get destroyed. */
 912         err = obd_precleanup(obd);
 913         if (err)
 914                 CERROR("Precleanup %s returned %d\n",
 915                        obd->obd_name, err);
 916
 917         /* destroy an uuid-export hash body */
 918         rhashtable_free_and_destroy(&obd->obd_uuid_hash, obd_export_exit,
 919                                     NULL);
 920 #ifdef HAVE_SERVER_SUPPORT
 921         /* destroy a nid-export hash body */
 922         rhltable_free_and_destroy(&obd->obd_nid_hash, nid_export_exit, NULL);
 923
 924         /* destroy a nid-stats hash body */
 925         if (obd->obd_nid_stats_hash) {
 926                 cfs_hash_putref(obd->obd_nid_stats_hash);
 927                 obd->obd_nid_stats_hash = NULL;
 928         }
 929
 930         /* destroy a client_generation-export hash body */
 931         if (obd->obd_gen_hash) {
 932                 cfs_hash_putref(obd->obd_gen_hash);
 933                 obd->obd_gen_hash = NULL;
 934         }
 935 #endif /* HAVE_SERVER_SUPPORT */
 936         class_decref(obd, "setup", obd);
 937         obd->obd_set_up = 0;
 938
 939         RETURN(0);
 940 }
 941
 942 struct obd_device *class_incref(struct obd_device *obd,
 943                                 const char *scope,
 944                                 const void *source)
 945 {
 946         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 947         atomic_inc(&obd->obd_refcount);
 948         CDEBUG(D_INFO, "incref %s (%p) now %d - %s\n", obd->obd_name, obd,
 949                atomic_read(&obd->obd_refcount), scope);
 950
 951         return obd;
 952 }
 953 EXPORT_SYMBOL(class_incref);
 954
 955 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 956 {
 957         int last;
 958
 959         CDEBUG(D_INFO, "Decref %s (%p) now %d - %s\n", obd->obd_name, obd,
 960                atomic_read(&obd->obd_refcount), scope);
 961
 962         LASSERT(obd->obd_num_exports >= 0);
 963         last = atomic_dec_and_test(&obd->obd_refcount);
 964         lu_ref_del(&obd->obd_reference, scope, source);
 965
 966         if (last) {
 967                 struct obd_export *exp;
 968
 969                 LASSERT(!obd->obd_attached);
 970                 /*
 971                  * All exports have been destroyed; there should
 972                  * be no more in-progress ops by this point.
 973                  */
 974                 exp = obd->obd_self_export;
 975
 976                 if (exp) {
 977                         exp->exp_flags |= exp_flags_from_obd(obd);
 978                         class_unlink_export(exp);
 979                 }
 980         }
 981 }
 982 EXPORT_SYMBOL(class_decref);
 983
 984 /**
 985  * Add a failover NID location.
 986  * Client OBD types contact server OBD types using this NID list.
 987  */
 988 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 989 {
 990         struct obd_import *imp;
 991         struct obd_uuid uuid;
 992         int rc;
 993
 994         ENTRY;
 995
 996         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 997             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 998                 CERROR("invalid conn_uuid\n");
 999                 RETURN(-EINVAL);
1000         }
1001         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
1002             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
1003             strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) &&
1004             strcmp(obd->obd_type->typ_name, LUSTRE_LWP_NAME) &&
1005             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
1006                 CERROR("can't add connection on non-client dev\n");
1007                 RETURN(-EINVAL);
1008         }
1009
1010         imp = obd->u.cli.cl_import;
1011         if (!imp) {
1012                 CERROR("try to add conn on immature client dev\n");
1013                 RETURN(-EINVAL);
1014         }
1015
1016         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
1017         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
1018
1019         RETURN(rc);
1020 }
1021 EXPORT_SYMBOL(class_add_conn);
1022
1023 /** Remove a failover NID location. */
1024 static int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
1025 {
1026         struct obd_import *imp;
1027         struct obd_uuid uuid;
1028         int rc;
1029
1030         ENTRY;
1031
1032         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
1033             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
1034                 CERROR("invalid conn_uuid\n");
1035                 RETURN(-EINVAL);
1036         }
1037         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
1038             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
1039                 CERROR("can't del connection on non-client dev\n");
1040                 RETURN(-EINVAL);
1041         }
1042
1043         imp = obd->u.cli.cl_import;
1044         if (!imp) {
1045                 CERROR("try to del conn on immature client dev\n");
1046                 RETURN(-EINVAL);
1047         }
1048
1049         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
1050         rc = obd_del_conn(imp, &uuid);
1051
1052         RETURN(rc);
1053 }
1054
1055 static LIST_HEAD(lustre_profile_list);
1056 static DEFINE_SPINLOCK(lustre_profile_list_lock);
1057
1058 static struct lustre_profile *class_get_profile_nolock(const char *prof)
1059 {
1060         struct lustre_profile *lprof;
1061
1062         ENTRY;
1063         list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
1064                 if (strcmp(lprof->lp_profile, prof) == 0) {
1065                         lprof->lp_refs++;
1066                         RETURN(lprof);
1067                 }
1068         }
1069         RETURN(NULL);
1070 }
1071
1072 struct lustre_profile *class_get_profile(const char *prof)
1073 {
1074         struct lustre_profile *lprof;
1075
1076         ENTRY;
1077         spin_lock(&lustre_profile_list_lock);
1078         lprof = class_get_profile_nolock(prof);
1079         spin_unlock(&lustre_profile_list_lock);
1080         RETURN(lprof);
1081 }
1082 EXPORT_SYMBOL(class_get_profile);
1083
1084 /**
1085  * Create a named "profile".
1086  * This defines the MDC and OSC names to use for a client.
1087  * This also is used to define the LOV to be used by a MDT.
1088  */
1089 static int class_add_profile(int proflen, char *prof, int osclen, char *osc,
1090                              int mdclen, char *mdc)
1091 {
1092         struct lustre_profile *lprof;
1093         int err = 0;
1094
1095         ENTRY;
1096
1097         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
1098
1099         OBD_ALLOC(lprof, sizeof(*lprof));
1100         if (!lprof)
1101                 RETURN(-ENOMEM);
1102         INIT_LIST_HEAD(&lprof->lp_list);
1103
1104         LASSERT(proflen == (strlen(prof) + 1));
1105         OBD_ALLOC(lprof->lp_profile, proflen);
1106         if (!lprof->lp_profile)
1107                 GOTO(out, err = -ENOMEM);
1108         memcpy(lprof->lp_profile, prof, proflen);
1109
1110         LASSERT(osclen == (strlen(osc) + 1));
1111         OBD_ALLOC(lprof->lp_dt, osclen);
1112         if (!lprof->lp_dt)
1113                 GOTO(out, err = -ENOMEM);
1114         memcpy(lprof->lp_dt, osc, osclen);
1115
1116         if (mdclen > 0) {
1117                 LASSERT(mdclen == (strlen(mdc) + 1));
1118                 OBD_ALLOC(lprof->lp_md, mdclen);
1119                 if (!lprof->lp_md)
1120                         GOTO(out, err = -ENOMEM);
1121                 memcpy(lprof->lp_md, mdc, mdclen);
1122         }
1123
1124         spin_lock(&lustre_profile_list_lock);
1125         lprof->lp_refs = 1;
1126         lprof->lp_list_deleted = false;
1127
1128         list_add(&lprof->lp_list, &lustre_profile_list);
1129         spin_unlock(&lustre_profile_list_lock);
1130         RETURN(err);
1131
1132 out:
1133         if (lprof->lp_md)
1134                 OBD_FREE(lprof->lp_md, mdclen);
1135         if (lprof->lp_dt)
1136                 OBD_FREE(lprof->lp_dt, osclen);
1137         if (lprof->lp_profile)
1138                 OBD_FREE(lprof->lp_profile, proflen);
1139         OBD_FREE(lprof, sizeof(*lprof));
1140         RETURN(err);
1141 }
1142
1143 void class_del_profile(const char *prof)
1144 {
1145         struct lustre_profile *lprof;
1146
1147         ENTRY;
1148
1149         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
1150
1151         spin_lock(&lustre_profile_list_lock);
1152         lprof = class_get_profile_nolock(prof);
1153         if (lprof) {
1154                 /* because get profile increments the ref counter */
1155                 lprof->lp_refs--;
1156                 list_del(&lprof->lp_list);
1157                 lprof->lp_list_deleted = true;
1158                 spin_unlock(&lustre_profile_list_lock);
1159
1160                 class_put_profile(lprof);
1161         } else {
1162                 spin_unlock(&lustre_profile_list_lock);
1163         }
1164         EXIT;
1165 }
1166 EXPORT_SYMBOL(class_del_profile);
1167
1168 void class_put_profile(struct lustre_profile *lprof)
1169 {
1170         spin_lock(&lustre_profile_list_lock);
1171         if ((--lprof->lp_refs) > 0) {
1172                 LASSERT(lprof->lp_refs > 0);
1173                 spin_unlock(&lustre_profile_list_lock);
1174                 return;
1175         }
1176         spin_unlock(&lustre_profile_list_lock);
1177
1178         /* confirm not a negative number */
1179         LASSERT(lprof->lp_refs == 0);
1180
1181         /*
1182          * At least one class_del_profile/profiles must be called
1183          * on the target profile or lustre_profile_list will corrupt
1184          */
1185         LASSERT(lprof->lp_list_deleted);
1186         OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
1187         OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
1188         if (lprof->lp_md)
1189                 OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
1190         OBD_FREE(lprof, sizeof(*lprof));
1191 }
1192 EXPORT_SYMBOL(class_put_profile);
1193
1194 /* COMPAT_146 */
1195 void class_del_profiles(void)
1196 {
1197         struct lustre_profile *lprof, *n;
1198         ENTRY;
1199
1200         spin_lock(&lustre_profile_list_lock);
1201         list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
1202                 list_del(&lprof->lp_list);
1203                 lprof->lp_list_deleted = true;
1204                 spin_unlock(&lustre_profile_list_lock);
1205
1206                 class_put_profile(lprof);
1207
1208                 spin_lock(&lustre_profile_list_lock);
1209         }
1210         spin_unlock(&lustre_profile_list_lock);
1211         EXIT;
1212 }
1213 EXPORT_SYMBOL(class_del_profiles);
1214
1215 /*
1216  * We can't call lquota_process_config directly because
1217  * it lives in a module that must be loaded after this one.
1218  */
1219 #ifdef HAVE_SERVER_SUPPORT
1220 static int (*quota_process_config)(struct lustre_cfg *lcfg) = NULL;
1221 #endif /* HAVE_SERVER_SUPPORT */
1222
1223 /**
1224  * Rename the proc parameter in \a cfg with a new name \a new_name.
1225  *
1226  * \param cfg      config structure which contains the proc parameter
1227  * \param new_name new name of the proc parameter
1228  *
1229  * \retval valid-pointer    pointer to the newly-allocated config structure
1230  *                          which contains the renamed proc parameter
1231  * \retval ERR_PTR(-EINVAL) if \a cfg or \a new_name is NULL, or \a cfg does
1232  *                          not contain a proc parameter
1233  * \retval ERR_PTR(-ENOMEM) if memory allocation failure occurs
1234  */
1235 struct lustre_cfg *lustre_cfg_rename(struct lustre_cfg *cfg,
1236                                      const char *new_name)
1237 {
1238         struct lustre_cfg_bufs *bufs = NULL;
1239         struct lustre_cfg *new_cfg = NULL;
1240         char *param = NULL;
1241         char *new_param = NULL;
1242         char *value = NULL;
1243         int name_len = 0;
1244         int new_len = 0;
1245
1246         ENTRY;
1247
1248         if (!cfg || !new_name)
1249                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1250
1251         param = lustre_cfg_string(cfg, 1);
1252         if (!param)
1253                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1254
1255         value = strchr(param, '=');
1256         if (value)
1257                 name_len = value - param;
1258         else
1259                 name_len = strlen(param);
1260
1261         new_len = LUSTRE_CFG_BUFLEN(cfg, 1) + strlen(new_name) - name_len;
1262
1263         OBD_ALLOC(new_param, new_len);
1264         if (!new_param)
1265                 GOTO(out_nocfg, new_cfg = ERR_PTR(-ENOMEM));
1266
1267         strlcpy(new_param, new_name, new_len);
1268         if (value)
1269                 strcat(new_param, value);
1270
1271         OBD_ALLOC_PTR(bufs);
1272         if (!bufs)
1273                 GOTO(out_free_param, new_cfg = ERR_PTR(-ENOMEM));
1274
1275         lustre_cfg_bufs_reset(bufs, NULL);
1276         lustre_cfg_bufs_init(bufs, cfg);
1277         lustre_cfg_bufs_set_string(bufs, 1, new_param);
1278
1279         OBD_ALLOC(new_cfg, lustre_cfg_len(bufs->lcfg_bufcount,
1280                                           bufs->lcfg_buflen));
1281         if (!new_cfg)
1282                 GOTO(out_free_buf, new_cfg = ERR_PTR(-ENOMEM));
1283
1284         lustre_cfg_init(new_cfg, cfg->lcfg_command, bufs);
1285
1286         new_cfg->lcfg_num = cfg->lcfg_num;
1287         new_cfg->lcfg_flags = cfg->lcfg_flags;
1288         new_cfg->lcfg_nid = cfg->lcfg_nid;
1289         new_cfg->lcfg_nal = cfg->lcfg_nal;
1290 out_free_buf:
1291         OBD_FREE_PTR(bufs);
1292 out_free_param:
1293         OBD_FREE(new_param, new_len);
1294 out_nocfg:
1295         RETURN(new_cfg);
1296 }
1297 EXPORT_SYMBOL(lustre_cfg_rename);
1298
1299 static ssize_t process_param2_config(struct lustre_cfg *lcfg)
1300 {
1301         char *param = lustre_cfg_string(lcfg, 1);
1302         char *upcall = lustre_cfg_string(lcfg, 2);
1303         struct kobject *kobj = NULL;
1304         const char *subsys = param;
1305         char *newparam = NULL;
1306         char *argv[] = {
1307                 [0] = "/usr/sbin/lctl",
1308                 [1] = "set_param",
1309                 [2] = param,
1310                 [3] = NULL
1311         };
1312         ktime_t start;
1313         ktime_t end;
1314         size_t len;
1315         int rc;
1316
1317         ENTRY;
1318         print_lustre_cfg(lcfg);
1319
1320         len = strcspn(param, ".=");
1321         if (!len)
1322                 RETURN(-EINVAL);
1323
1324         /* If we find '=' then its the top level sysfs directory */
1325         if (param[len] == '=')
1326                 RETURN(class_set_global(param));
1327
1328         subsys = kstrndup(param, len, GFP_KERNEL);
1329         if (!subsys)
1330                 RETURN(-ENOMEM);
1331
1332         kobj = kset_find_obj(lustre_kset, subsys);
1333         kfree(subsys);
1334         if (kobj) {
1335                 char *value = param;
1336                 char *envp[4];
1337                 int i;
1338
1339                 param = strsep(&value, "=");
1340                 envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s", param);
1341                 envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1342                 envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1343                                     ktime_get_real_seconds());
1344                 envp[3] = NULL;
1345
1346                 rc = kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
1347                 for (i = 0; i < ARRAY_SIZE(envp); i++)
1348                         kfree(envp[i]);
1349
1350                 kobject_put(kobj);
1351
1352                 RETURN(rc);
1353         }
1354
1355         /* Add upcall processing here. Now only lctl is supported */
1356         if (strcmp(upcall, LCTL_UPCALL) != 0) {
1357                 CERROR("Unsupported upcall %s\n", upcall);
1358                 RETURN(-EINVAL);
1359         }
1360
1361         /* root_squash and nosquash_nids settings must be applied to
1362          * global subsystem (*.) so that it is taken into account by
1363          * both client and server sides. So do the equivalent of a
1364          * 's / mdt. / *. /'.
1365          */
1366         if ((strstr(param, PARAM_NOSQUASHNIDS) ||
1367              strstr(param, PARAM_ROOTSQUASH)) &&
1368             (param[0] != '*' || param[1] != '.')) {
1369                 newparam = kmalloc(strlen(param) + 1, GFP_NOFS);
1370                 if (!newparam)
1371                         RETURN(-ENOMEM);
1372
1373                 snprintf(newparam, strlen(param) + 1, "*%s", param + len);
1374                 argv[2] = (char *)newparam;
1375         }
1376
1377         start = ktime_get();
1378         rc = call_usermodehelper(argv[0], argv, NULL, UMH_WAIT_PROC);
1379         end = ktime_get();
1380
1381         if (rc < 0) {
1382                 CERROR("lctl: error invoking upcall %s %s %s: rc = %d; "
1383                        "time %ldus\n", argv[0], argv[1], argv[2], rc,
1384                        (long)ktime_us_delta(end, start));
1385         } else {
1386                 CDEBUG(D_HA, "lctl: invoked upcall %s %s %s, time %ldus\n",
1387                        argv[0], argv[1], argv[2],
1388                        (long)ktime_us_delta(end, start));
1389                        rc = 0;
1390         }
1391
1392         kfree(newparam);
1393         RETURN(rc);
1394 }
1395
1396 #ifdef HAVE_SERVER_SUPPORT
1397 void lustre_register_quota_process_config(int (*qpc)(struct lustre_cfg *lcfg))
1398 {
1399         quota_process_config = qpc;
1400 }
1401 EXPORT_SYMBOL(lustre_register_quota_process_config);
1402 #endif /* HAVE_SERVER_SUPPORT */
1403
1404 /**
1405  * Process configuration commands given in lustre_cfg form.
1406  * These may come from direct calls (e.g. class_manual_cleanup)
1407  * or processing the config llog, or ioctl from lctl.
1408  */
1409 int class_process_config(struct lustre_cfg *lcfg)
1410 {
1411         struct obd_device *obd;
1412         struct lnet_nid nid;
1413         int err;
1414
1415         LASSERT(lcfg && !IS_ERR(lcfg));
1416         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
1417
1418         /* Commands that don't need a device */
1419         switch (lcfg->lcfg_command) {
1420         case LCFG_ATTACH: {
1421                 err = class_attach(lcfg);
1422                 GOTO(out, err);
1423         }
1424         case LCFG_ADD_UUID: {
1425                 CDEBUG(D_IOCTL,
1426                        "adding mapping from uuid %s to nid %#llx (%s)\n",
1427                        lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid,
1428                        libcfs_nid2str(lcfg->lcfg_nid));
1429
1430                 lnet_nid4_to_nid(lcfg->lcfg_nid, &nid);
1431                 err = class_add_uuid(lustre_cfg_string(lcfg, 1), &nid);
1432                 GOTO(out, err);
1433         }
1434         case LCFG_DEL_UUID: {
1435                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
1436                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) ==
1437                         0) ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
1438
1439                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
1440                 GOTO(out, err);
1441         }
1442         case LCFG_MOUNTOPT: {
1443                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
1444                        lustre_cfg_string(lcfg, 1),
1445                        lustre_cfg_string(lcfg, 2),
1446                        lustre_cfg_string(lcfg, 3));
1447                 /*
1448                  * set these mount options somewhere, so ll_fill_super
1449                  * can find them.
1450                  */
1451                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
1452                                         lustre_cfg_string(lcfg, 1),
1453                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
1454                                         lustre_cfg_string(lcfg, 2),
1455                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
1456                                         lustre_cfg_string(lcfg, 3));
1457                 GOTO(out, err);
1458         }
1459         case LCFG_DEL_MOUNTOPT: {
1460                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
1461                        lustre_cfg_string(lcfg, 1));
1462                 class_del_profile(lustre_cfg_string(lcfg, 1));
1463                 GOTO(out, err = 0);
1464         }
1465         case LCFG_SET_TIMEOUT: {
1466                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
1467                        obd_timeout, lcfg->lcfg_num);
1468                 obd_timeout = max(lcfg->lcfg_num, 1U);
1469                 ping_interval = max(obd_timeout / 4, 1U);
1470                 obd_timeout_set = 1;
1471                 GOTO(out, err = 0);
1472         }
1473         case LCFG_SET_LDLM_TIMEOUT: {
1474                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
1475                        ldlm_timeout, lcfg->lcfg_num);
1476                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
1477                 if (ldlm_timeout >= obd_timeout)
1478                         ldlm_timeout = max(obd_timeout / 3, 1U);
1479                 ldlm_timeout_set = 1;
1480                 GOTO(out, err = 0);
1481         }
1482         case LCFG_SET_UPCALL: {
1483                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
1484                 /* COMPAT_146 Don't fail on old configs */
1485                 GOTO(out, err = 0);
1486         }
1487         case LCFG_MARKER: {
1488                 struct cfg_marker *marker;
1489
1490                 marker = lustre_cfg_buf(lcfg, 1);
1491                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
1492                        marker->cm_flags, marker->cm_tgtname,
1493                        marker->cm_comment);
1494                 GOTO(out, err = 0);
1495         }
1496         case LCFG_PARAM: {
1497                 char *tmp;
1498
1499                 /* llite has no OBD */
1500                 if (class_match_param(lustre_cfg_string(lcfg, 1),
1501                                       PARAM_LLITE, NULL) == 0) {
1502                         struct lustre_sb_info *lsi;
1503                         unsigned long addr;
1504                         ssize_t count;
1505
1506                         /*
1507                          * The instance name contains the sb:
1508                          * lustre-client-aacfe000
1509                          */
1510                         tmp = strrchr(lustre_cfg_string(lcfg, 0), '-');
1511                         if (!tmp || !*(++tmp))
1512                                 GOTO(out, err = -EINVAL);
1513
1514                         if (sscanf(tmp, "%lx", &addr) != 1)
1515                                 GOTO(out, err = -EINVAL);
1516
1517                         lsi = s2lsi((struct super_block *)addr);
1518                         /* This better be a real Lustre superblock! */
1519                         LASSERT(lsi->lsi_lmd->lmd_magic == LMD_MAGIC);
1520
1521                         count = class_modify_config(lcfg, PARAM_LLITE,
1522                                                     lsi->lsi_kobj);
1523                         err = count < 0 ? count : 0;
1524                         GOTO(out, err);
1525                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1526                                               PARAM_SYS, &tmp) == 0)) {
1527                         /* Global param settings */
1528                         err = class_set_global(tmp);
1529                         /*
1530                          * Client or server should not fail to mount if
1531                          * it hits an unknown configuration parameter.
1532                          */
1533                         if (err < 0)
1534                                 CWARN("Ignoring unknown param %s\n", tmp);
1535
1536                         GOTO(out, err = 0);
1537 #ifdef HAVE_SERVER_SUPPORT
1538                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1539                                               PARAM_QUOTA, &tmp) == 0) &&
1540                            quota_process_config) {
1541                         err = (*quota_process_config)(lcfg);
1542                         GOTO(out, err);
1543 #endif /* HAVE_SERVER_SUPPORT */
1544                 }
1545
1546                 break;
1547         }
1548         case LCFG_SET_PARAM: {
1549                 err = process_param2_config(lcfg);
1550                 GOTO(out, err = 0);
1551         }
1552         }
1553         /* Commands that require a device */
1554         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1555         if (!obd) {
1556                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
1557                         CERROR("this lcfg command requires a device name\n");
1558                 else
1559                         CERROR("no device for: %s\n",
1560                                lustre_cfg_string(lcfg, 0));
1561
1562                 GOTO(out, err = -EINVAL);
1563         }
1564         switch(lcfg->lcfg_command) {
1565         case LCFG_SETUP: {
1566                 err = class_setup(obd, lcfg);
1567                 GOTO(out, err);
1568         }
1569         case LCFG_DETACH: {
1570                 err = class_detach(obd, lcfg);
1571                 GOTO(out, err = 0);
1572         }
1573         case LCFG_CLEANUP: {
1574                 err = class_cleanup(obd, lcfg);
1575                 GOTO(out, err = 0);
1576         }
1577         case LCFG_ADD_CONN: {
1578                 err = class_add_conn(obd, lcfg);
1579                 GOTO(out, err = 0);
1580         }
1581         case LCFG_DEL_CONN: {
1582                 err = class_del_conn(obd, lcfg);
1583                 GOTO(out, err = 0);
1584         }
1585         case LCFG_POOL_NEW: {
1586                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
1587                 GOTO(out, err = 0);
1588         }
1589         case LCFG_POOL_ADD: {
1590                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
1591                                    lustre_cfg_string(lcfg, 3));
1592                 GOTO(out, err = 0);
1593         }
1594         case LCFG_POOL_REM: {
1595                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
1596                                    lustre_cfg_string(lcfg, 3));
1597                 GOTO(out, err = 0);
1598         }
1599         case LCFG_POOL_DEL: {
1600                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
1601                 GOTO(out, err = 0);
1602         }
1603         /*
1604          * Process config log ADD_MDC record twice to add MDC also to LOV
1605          * for Data-on-MDT:
1606          *
1607          * add 0:lustre-clilmv 1:lustre-MDT0000_UUID 2:0 3:1
1608          *     4:lustre-MDT0000-mdc_UUID
1609          */
1610         case LCFG_ADD_MDC: {
1611                 struct obd_device *lov_obd;
1612                 char *clilmv;
1613
1614                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1615                 if (err)
1616                         GOTO(out, err);
1617
1618                 /* make sure this is client LMV log entry */
1619                 clilmv = strstr(lustre_cfg_string(lcfg, 0), "clilmv");
1620                 if (!clilmv)
1621                         GOTO(out, err);
1622
1623                 /*
1624                  * replace 'lmv' with 'lov' name to address LOV device and
1625                  * process llog record to add MDC there.
1626                  */
1627                 clilmv[4] = 'o';
1628                 lov_obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1629                 if (lov_obd) {
1630                         err = obd_process_config(lov_obd, sizeof(*lcfg), lcfg);
1631                 } else {
1632                         err = -ENOENT;
1633                         CERROR("%s: Cannot find LOV by %s name, rc = %d\n",
1634                                obd->obd_name, lustre_cfg_string(lcfg, 0), err);
1635                 }
1636                 /* restore 'lmv' name */
1637                 clilmv[4] = 'm';
1638                 GOTO(out, err);
1639         }
1640         default: {
1641                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1642                 GOTO(out, err);
1643         }
1644         }
1645         EXIT;
1646 out:
1647         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
1648                 CWARN("Ignoring error %d on optional command %#x\n", err,
1649                       lcfg->lcfg_command);
1650                 err = 0;
1651         }
1652         return err;
1653 }
1654 EXPORT_SYMBOL(class_process_config);
1655
1656 ssize_t class_modify_config(struct lustre_cfg *lcfg, const char *prefix,
1657                             struct kobject *kobj)
1658 {
1659         const struct kobj_type *typ;
1660         ssize_t count = 0;
1661         int i;
1662
1663         if (lcfg->lcfg_command != LCFG_PARAM) {
1664                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1665                 return -EINVAL;
1666         }
1667
1668         typ = get_ktype(kobj);
1669         if (!typ || !typ->default_groups)
1670                 return -ENODEV;
1671
1672         print_lustre_cfg(lcfg);
1673
1674         /*
1675          * e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1676          * or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1677          * or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36
1678          */
1679         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1680                 struct attribute *attr = NULL;
1681                 size_t keylen;
1682                 char *value;
1683                 char *key;
1684
1685                 key = lustre_cfg_buf(lcfg, i);
1686                 /* Strip off prefix */
1687                 if (class_match_param(key, prefix, &key))
1688                         /*
1689                          * If the prefix doesn't match, return error so we
1690                          * can pass it down the stack
1691                          */
1692                         return -EINVAL;
1693
1694                 value = strchr(key, '=');
1695                 if (!value || *(value + 1) == 0) {
1696                         CERROR("%s: can't parse param '%s' (missing '=')\n",
1697                                lustre_cfg_string(lcfg, 0),
1698                                lustre_cfg_string(lcfg, i));
1699                         /* continue parsing other params */
1700                         continue;
1701                 }
1702                 keylen = value - key;
1703                 value++;
1704
1705                 attr = get_attr_starts_with(typ, key, keylen);
1706                 if (!attr) {
1707                         char *envp[4], *param, *path;
1708
1709                         path = kobject_get_path(kobj, GFP_KERNEL);
1710                         if (!path)
1711                                 return -EINVAL;
1712
1713                         /* convert sysfs path to uevent format */
1714                         param = path;
1715                         while ((param = strchr(param, '/')) != NULL)
1716                                 *param = '.';
1717
1718                         param = strstr(path, "fs.lustre.") + 10;
1719
1720                         envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s.%.*s",
1721                                             param, (int) keylen, key);
1722                         envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1723                         envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1724                                             ktime_get_real_seconds());
1725                         envp[3] = NULL;
1726
1727                         if (kobject_uevent_env(kobj, KOBJ_CHANGE, envp)) {
1728                                 CERROR("%s: failed to send uevent %s\n",
1729                                        kobject_name(kobj), key);
1730                         }
1731
1732                         for (i = 0; i < ARRAY_SIZE(envp); i++)
1733                                 kfree(envp[i]);
1734                         kfree(path);
1735                 } else {
1736                         count += lustre_attr_store(kobj, attr, value,
1737                                                    strlen(value));
1738                 }
1739         }
1740         return count;
1741 }
1742 EXPORT_SYMBOL(class_modify_config);
1743
1744 /*
1745  * Supplemental functions for config logs, it allocates lustre_cfg
1746  * buffers plus initialized llog record header at the beginning.
1747  */
1748 struct llog_cfg_rec *lustre_cfg_rec_new(int cmd, struct lustre_cfg_bufs *bufs)
1749 {
1750         struct llog_cfg_rec *lcr;
1751         int reclen;
1752
1753         ENTRY;
1754
1755         reclen = lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen);
1756         reclen = llog_data_len(reclen) + sizeof(struct llog_rec_hdr) +
1757                  sizeof(struct llog_rec_tail);
1758
1759         OBD_ALLOC(lcr, reclen);
1760         if (!lcr)
1761                 RETURN(NULL);
1762
1763         lustre_cfg_init(&lcr->lcr_cfg, cmd, bufs);
1764
1765         lcr->lcr_hdr.lrh_len = reclen;
1766         lcr->lcr_hdr.lrh_type = OBD_CFG_REC;
1767
1768         RETURN(lcr);
1769 }
1770 EXPORT_SYMBOL(lustre_cfg_rec_new);
1771
1772 void lustre_cfg_rec_free(struct llog_cfg_rec *lcr)
1773 {
1774         ENTRY;
1775         OBD_FREE(lcr, lcr->lcr_hdr.lrh_len);
1776         EXIT;
1777 }
1778 EXPORT_SYMBOL(lustre_cfg_rec_free);
1779
1780 /**
1781  * Parse a configuration llog, doing various manipulations on them
1782  * for various reasons, (modifications for compatibility, skip obsolete
1783  * records, change uuids, etc), then class_process_config() resulting
1784  * net records.
1785  */
1786 int class_config_llog_handler(const struct lu_env *env,
1787                               struct llog_handle *handle,
1788                               struct llog_rec_hdr *rec, void *data)
1789 {
1790         struct config_llog_instance *cfg = data;
1791         int cfg_len = rec->lrh_len;
1792         char *cfg_buf = (char *) (rec + 1);
1793         int rc = 0;
1794         ENTRY;
1795
1796         /* class_config_dump_handler(handle, rec, data); */
1797
1798         switch (rec->lrh_type) {
1799         case OBD_CFG_REC: {
1800                 struct lustre_cfg *lcfg, *lcfg_new;
1801                 struct lustre_cfg_bufs bufs;
1802                 char *inst_name = NULL;
1803                 int inst_len = 0;
1804                 int swab = 0;
1805
1806                 lcfg = (struct lustre_cfg *)cfg_buf;
1807                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1808                         lustre_swab_lustre_cfg(lcfg);
1809                         swab = 1;
1810                 }
1811
1812                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1813                 if (rc)
1814                         GOTO(out, rc);
1815
1816                 /* Figure out config state info */
1817                 if (lcfg->lcfg_command == LCFG_MARKER) {
1818                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1819                         lustre_swab_cfg_marker(marker, swab,
1820                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1821                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1822                                cfg->cfg_flags, marker->cm_flags);
1823                         if (marker->cm_flags & CM_START) {
1824                                 /* all previous flags off */
1825                                 cfg->cfg_flags = CFG_F_MARKER;
1826                                 server_name2index(marker->cm_tgtname,
1827                                                   &cfg->cfg_lwp_idx, NULL);
1828                                 if (marker->cm_flags & CM_SKIP) {
1829                                         cfg->cfg_flags |= CFG_F_SKIP;
1830                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1831                                                marker->cm_step);
1832                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1833                                            (cfg->cfg_sb &&
1834                                            lustre_check_exclusion(cfg->cfg_sb,
1835                                                         marker->cm_tgtname))) {
1836                                         cfg->cfg_flags |= CFG_F_EXCLUDE;
1837                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1838                                                marker->cm_step);
1839                                 }
1840                         } else if (marker->cm_flags & CM_END) {
1841                                 cfg->cfg_flags = 0;
1842                         }
1843                 }
1844                 /*
1845                  * A config command without a start marker before it is
1846                  * illegal
1847                  */
1848                 if (!(cfg->cfg_flags & CFG_F_MARKER) &&
1849                     (lcfg->lcfg_command != LCFG_MARKER)) {
1850                         CWARN("Skip config outside markers, (inst: %016lx, uuid: %s, flags: %#x)\n",
1851                                 cfg->cfg_instance,
1852                                 cfg->cfg_uuid.uuid, cfg->cfg_flags);
1853                         cfg->cfg_flags |= CFG_F_SKIP;
1854                 }
1855                 if (cfg->cfg_flags & CFG_F_SKIP) {
1856                         CDEBUG(D_CONFIG, "skipping %#x\n",
1857                                cfg->cfg_flags);
1858                         rc = 0;
1859                         /* No processing! */
1860                         break;
1861                 }
1862
1863                 /*
1864                  * For interoperability between 1.8 and 2.0,
1865                  * rename "mds" OBD device type to "mdt".
1866                  */
1867                 {
1868                         char *typename = lustre_cfg_string(lcfg, 1);
1869                         char *index = lustre_cfg_string(lcfg, 2);
1870
1871                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1872                             strcmp(typename, "mds") == 0)) {
1873                                 CWARN("For 1.8 interoperability, rename obd "
1874                                         "type from mds to mdt\n");
1875                                 typename[2] = 't';
1876                         }
1877                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1878                             strcmp(index, "type") == 0)) {
1879                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1880                                        "set this index to '0'\n");
1881                                 index[0] = '0';
1882                                 index[1] = 0;
1883                         }
1884                 }
1885
1886 #ifdef HAVE_SERVER_SUPPORT
1887                 /* newer MDS replaces LOV/OSC with LOD/OSP */
1888                 if ((lcfg->lcfg_command == LCFG_ATTACH ||
1889                      lcfg->lcfg_command == LCFG_SET_PARAM ||
1890                      lcfg->lcfg_command == LCFG_PARAM) &&
1891                     cfg->cfg_sb && IS_MDT(s2lsi(cfg->cfg_sb))) {
1892                         char *typename = lustre_cfg_string(lcfg, 1);
1893
1894                         if (typename &&
1895                             strcmp(typename, LUSTRE_LOV_NAME) == 0) {
1896                                 CDEBUG(D_CONFIG,
1897                                        "For 2.x interoperability, rename obd "
1898                                        "type from lov to lod (%s)\n",
1899                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1900                                 strcpy(typename, LUSTRE_LOD_NAME);
1901                         }
1902                         if (typename &&
1903                             strcmp(typename, LUSTRE_OSC_NAME) == 0) {
1904                                 CDEBUG(D_CONFIG,
1905                                        "For 2.x interoperability, rename obd "
1906                                        "type from osc to osp (%s)\n",
1907                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1908                                 strcpy(typename, LUSTRE_OSP_NAME);
1909                         }
1910                 }
1911 #endif /* HAVE_SERVER_SUPPORT */
1912
1913                 if (cfg->cfg_flags & CFG_F_EXCLUDE) {
1914                         CDEBUG(D_CONFIG, "cmd: %x marked EXCLUDED\n",
1915                                lcfg->lcfg_command);
1916                         if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD)
1917                                 /* Add inactive instead */
1918                                 lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1919                 }
1920
1921                 lustre_cfg_bufs_reset(&bufs, NULL);
1922                 lustre_cfg_bufs_init(&bufs, lcfg);
1923
1924                 if (cfg->cfg_instance &&
1925                     lcfg->lcfg_command != LCFG_SPTLRPC_CONF &&
1926                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
1927                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1928                                 LUSTRE_MAXINSTANCE + 4;
1929                         OBD_ALLOC(inst_name, inst_len);
1930                         if (!inst_name)
1931                                 GOTO(out, rc = -ENOMEM);
1932                         snprintf(inst_name, inst_len, "%s-%016lx",
1933                                 lustre_cfg_string(lcfg, 0),
1934                                 cfg->cfg_instance);
1935                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1936                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1937                                lcfg->lcfg_command, inst_name);
1938                 }
1939
1940                 /* override llog UUID for clients, to insure they are unique */
1941                 if (cfg->cfg_instance && lcfg->lcfg_command == LCFG_ATTACH)
1942                         lustre_cfg_bufs_set_string(&bufs, 2,
1943                                                    cfg->cfg_uuid.uuid);
1944                 /*
1945                  * sptlrpc config record, we expect 2 data segments:
1946                  *  [0]: fs_name/target_name,
1947                  *  [1]: rule string
1948                  * moving them to index [1] and [2], and insert MGC's
1949                  * obdname at index [0].
1950                  */
1951                 if (cfg->cfg_instance &&
1952                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1953                         /* After ASLR changes cfg_instance this needs fixing */
1954                         /* "obd" is set in config_log_find_or_add() */
1955                         struct obd_device *obd = (void *)cfg->cfg_instance;
1956
1957                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1958                                             bufs.lcfg_buflen[1]);
1959                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1960                                             bufs.lcfg_buflen[0]);
1961                         lustre_cfg_bufs_set_string(&bufs, 0,
1962                                                    obd->obd_name);
1963                 }
1964
1965                 /*
1966                  * Add net info to setup command
1967                  * if given on command line.
1968                  * So config log will be:
1969                  * [0]: client name
1970                  * [1]: client UUID
1971                  * [2]: server UUID
1972                  * [3]: inactive-on-startup
1973                  * [4]: restrictive net
1974                  */
1975                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1976                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1977                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1978                         char *nidnet = lsi->lsi_lmd->lmd_nidnet;
1979
1980                         if (lcfg->lcfg_command == LCFG_SETUP &&
1981                             lcfg->lcfg_bufcount != 2 && nidnet) {
1982                                 CDEBUG(D_CONFIG, "Adding net %s info to setup "
1983                                        "command for client %s\n", nidnet,
1984                                        lustre_cfg_string(lcfg, 0));
1985                                 lustre_cfg_bufs_set_string(&bufs, 4, nidnet);
1986                         }
1987                 }
1988
1989                 OBD_ALLOC(lcfg_new, lustre_cfg_len(bufs.lcfg_bufcount,
1990                                                    bufs.lcfg_buflen));
1991                 if (!lcfg_new)
1992                         GOTO(out_inst, rc = -ENOMEM);
1993
1994                 lustre_cfg_init(lcfg_new, lcfg->lcfg_command, &bufs);
1995                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1996                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1997
1998                 /*
1999                  * XXX Hack to try to remain binary compatible with
2000                  * pre-newconfig logs
2001                  */
2002                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
2003                     (lcfg->lcfg_nid >> 32) == 0) {
2004                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
2005
2006                         lcfg_new->lcfg_nid =
2007                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
2008                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
2009                               lcfg->lcfg_nal, addr,
2010                               libcfs_nid2str(lcfg_new->lcfg_nid));
2011                 } else {
2012                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
2013                 }
2014
2015                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
2016
2017                 rc = class_process_config(lcfg_new);
2018                 OBD_FREE(lcfg_new, lustre_cfg_len(lcfg_new->lcfg_bufcount,
2019                                                   lcfg_new->lcfg_buflens));
2020 out_inst:
2021                 if (inst_name)
2022                         OBD_FREE(inst_name, inst_len);
2023                 break;
2024         }
2025         default:
2026                 CERROR("Unknown llog record type %#x encountered\n",
2027                        rec->lrh_type);
2028                 break;
2029         }
2030 out:
2031         if (rc) {
2032                 CERROR("%s: cfg command failed: rc = %d\n",
2033                         handle->lgh_ctxt->loc_obd->obd_name, rc);
2034                 class_config_dump_handler(NULL, handle, rec, data);
2035         }
2036         RETURN(rc);
2037 }
2038 EXPORT_SYMBOL(class_config_llog_handler);
2039
2040 int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
2041                             char *name, struct config_llog_instance *cfg)
2042 {
2043         struct llog_process_cat_data cd = {
2044                 .lpcd_first_idx = 0,
2045                 .lpcd_read_mode = LLOG_READ_MODE_NORMAL,
2046         };
2047         struct llog_handle *llh;
2048         llog_cb_t callback;
2049         int rc;
2050         ENTRY;
2051
2052         CDEBUG(D_INFO, "looking up llog %s\n", name);
2053         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
2054         if (rc)
2055                 RETURN(rc);
2056
2057         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
2058         if (rc)
2059                 GOTO(parse_out, rc);
2060
2061         /* continue processing from where we last stopped to end-of-log */
2062         if (cfg) {
2063                 cd.lpcd_first_idx = cfg->cfg_last_idx;
2064                 callback = cfg->cfg_callback;
2065                 LASSERT(callback != NULL);
2066         } else {
2067                 callback = class_config_llog_handler;
2068         }
2069
2070         cd.lpcd_last_idx = 0;
2071
2072         rc = llog_process(env, llh, callback, cfg, &cd);
2073
2074         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
2075                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
2076         if (cfg)
2077                 cfg->cfg_last_idx = cd.lpcd_last_idx;
2078
2079 parse_out:
2080         llog_close(env, llh);
2081         RETURN(rc);
2082 }
2083 EXPORT_SYMBOL(class_config_parse_llog);
2084
2085 /**
2086  * Get marker cfg_flag
2087  */
2088 void llog_get_marker_cfg_flags(struct llog_rec_hdr *rec,
2089                                unsigned int *cfg_flags)
2090 {
2091         struct lustre_cfg *lcfg = (struct lustre_cfg *)(rec + 1);
2092         struct cfg_marker *marker;
2093
2094         if (lcfg->lcfg_command == LCFG_MARKER) {
2095                 marker = lustre_cfg_buf(lcfg, 1);
2096                 if (marker->cm_flags & CM_START) {
2097                         *cfg_flags = CFG_F_MARKER;
2098                         if (marker->cm_flags & CM_SKIP)
2099                                 *cfg_flags = CFG_F_SKIP;
2100                 } else if (marker->cm_flags & CM_END) {
2101                         *cfg_flags = 0;
2102                 }
2103                 CDEBUG(D_INFO, "index=%d, cm_flags=%#08x cfg_flags=%#08x\n",
2104                        rec->lrh_index, marker->cm_flags, *cfg_flags);
2105         }
2106 }
2107
2108 /**
2109  * Parse config record and output dump in supplied buffer.
2110  *
2111  * This is separated from class_config_dump_handler() to use
2112  * for ioctl needs as well
2113  *
2114  * Sample Output:
2115  * - { index: 4, event: attach, device: lustrewt-clilov, type: lov,
2116  *     UUID: lustrewt-clilov_UUID }
2117  */
2118 int class_config_yaml_output(struct llog_rec_hdr *rec, char *buf, int size,
2119                              unsigned int *cfg_flags, bool raw)
2120 {
2121         struct lustre_cfg *lcfg = (struct lustre_cfg *)(rec + 1);
2122         char *ptr = buf;
2123         char *end = buf + size;
2124         int rc = 0, i;
2125         struct lcfg_type_data *ldata;
2126         int swab = 0;
2127
2128         LASSERT(rec->lrh_type == OBD_CFG_REC);
2129
2130         if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
2131                 lustre_swab_lustre_cfg(lcfg);
2132                 swab = 1;
2133         }
2134
2135         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2136         if (rc < 0)
2137                 return rc;
2138
2139         ldata = lcfg_cmd2data(lcfg->lcfg_command);
2140         if (!ldata)
2141                 return -ENOTTY;
2142
2143         llog_get_marker_cfg_flags(rec, cfg_flags);
2144         if ((lcfg->lcfg_command == LCFG_MARKER) && likely(!raw))
2145                 return 0;
2146         /* entries outside marker are skipped */
2147         if (!(*cfg_flags & CFG_F_MARKER) && !raw)
2148                 return 0;
2149         /* inside skipped marker */
2150         if ((*cfg_flags & CFG_F_SKIP) && !raw)
2151                 return 0;
2152
2153         /* form YAML entity */
2154         ptr += snprintf(ptr, end - ptr, "- { index: %u, event: %s",
2155                         rec->lrh_index, ldata->ltd_name);
2156         if (end - ptr <= 0)
2157                 goto out_overflow;
2158
2159         if (lcfg->lcfg_flags) {
2160                 ptr += snprintf(ptr, end - ptr, ", flags: %#08x",
2161                                 lcfg->lcfg_flags);
2162                 if (end - ptr <= 0)
2163                         goto out_overflow;
2164         }
2165         if (lcfg->lcfg_num) {
2166                 ptr += snprintf(ptr, end - ptr, ", num: %#08x",
2167                                 lcfg->lcfg_num);
2168                 if (end - ptr <= 0)
2169                         goto out_overflow;
2170         }
2171         if (lcfg->lcfg_nid) {
2172                 char nidstr[LNET_NIDSTR_SIZE];
2173
2174                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2175                 ptr += snprintf(ptr, end - ptr, ", nid: %s(%#llx)",
2176                                 nidstr, lcfg->lcfg_nid);
2177                 if (end - ptr <= 0)
2178                         goto out_overflow;
2179         }
2180
2181         if (LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
2182                 ptr += snprintf(ptr, end - ptr, ", device: %s",
2183                                 lustre_cfg_string(lcfg, 0));
2184                 if (end - ptr <= 0)
2185                         goto out_overflow;
2186         }
2187
2188         if (lcfg->lcfg_command == LCFG_SET_PARAM) {
2189                 /*
2190                  * set_param -P parameters have param=val here, separate
2191                  * them through pointer magic and print them out in
2192                  * native yamlese
2193                  */
2194                 char *cfg_str = lustre_cfg_string(lcfg, 1);
2195                 char *tmp = strchr(cfg_str, '=');
2196                 size_t len;
2197
2198                 if (!tmp)
2199                         goto out_done;
2200
2201                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[0]);
2202                 len = tmp - cfg_str + 1;
2203                 snprintf(ptr, len, "%s", cfg_str);
2204                 ptr += len - 1;
2205
2206                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[1]);
2207                 ptr += snprintf(ptr, end - ptr, "%s", tmp + 1);
2208
2209                 goto out_done;
2210         }
2211
2212         if (lcfg->lcfg_command == LCFG_MARKER) {
2213                 struct cfg_marker *marker;
2214
2215                 marker = lustre_cfg_buf(lcfg, 1);
2216                 ptr += snprintf(ptr, end - ptr, ", flags: %#04x",
2217                                 marker->cm_flags);
2218                 ptr += snprintf(ptr, end - ptr, ", version: %d.%d.%d.%d",
2219                                 OBD_OCD_VERSION_MAJOR(marker->cm_vers),
2220                                 OBD_OCD_VERSION_MINOR(marker->cm_vers),
2221                                 OBD_OCD_VERSION_PATCH(marker->cm_vers),
2222                                 OBD_OCD_VERSION_FIX(marker->cm_vers));
2223                 ptr += snprintf(ptr, end - ptr, ", createtime: %lld",
2224                                 marker->cm_createtime);
2225                 ptr += snprintf(ptr, end - ptr, ", canceltime: %lld",
2226                                 marker->cm_canceltime);
2227
2228                 goto out_done;
2229         }
2230
2231         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
2232                 if (LUSTRE_CFG_BUFLEN(lcfg, i) > 0) {
2233                         ptr += snprintf(ptr, end - ptr, ", %s: %s",
2234                                         ldata->ltd_bufs[i - 1],
2235                                         lustre_cfg_string(lcfg, i));
2236                         if (end - ptr <= 0)
2237                                 goto out_overflow;
2238                 }
2239         }
2240
2241 out_done:
2242         ptr += snprintf(ptr, end - ptr, " }\n");
2243 out_overflow:
2244         /* Return consumed bytes.  If the buffer overflowed, zero last byte */
2245         rc = ptr - buf;
2246         if (rc > size) {
2247                 rc = -EOVERFLOW;
2248                 *(end - 1) = '\0';
2249         }
2250
2251         return rc;
2252 }
2253
2254 /**
2255  * parse config record and output dump in supplied buffer.
2256  * This is separated from class_config_dump_handler() to use
2257  * for ioctl needs as well
2258  */
2259 static int class_config_parse_rec(struct llog_rec_hdr *rec, char *buf, int size)
2260 {
2261         struct lustre_cfg       *lcfg = (struct lustre_cfg *)(rec + 1);
2262         char                    *ptr = buf;
2263         char                    *end = buf + size;
2264         int                      rc = 0;
2265
2266         ENTRY;
2267
2268         LASSERT(rec->lrh_type == OBD_CFG_REC);
2269         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2270         if (rc < 0)
2271                 RETURN(rc);
2272
2273         ptr += snprintf(ptr, end-ptr, "cmd=%05x ", lcfg->lcfg_command);
2274         if (lcfg->lcfg_flags)
2275                 ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
2276                                 lcfg->lcfg_flags);
2277
2278         if (lcfg->lcfg_num)
2279                 ptr += snprintf(ptr, end-ptr, "num=%#08x ", lcfg->lcfg_num);
2280
2281         if (lcfg->lcfg_nid) {
2282                 char nidstr[LNET_NIDSTR_SIZE];
2283
2284                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2285                 ptr += snprintf(ptr, end-ptr, "nid=%s(%#llx)    ",
2286                                 nidstr, lcfg->lcfg_nid);
2287         }
2288
2289         if (lcfg->lcfg_command == LCFG_MARKER) {
2290                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
2291
2292                 ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
2293                                 marker->cm_step, marker->cm_flags,
2294                                 marker->cm_tgtname, marker->cm_comment);
2295         } else {
2296                 int i;
2297
2298                 for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
2299                         ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
2300                                         lustre_cfg_string(lcfg, i));
2301                 }
2302         }
2303         ptr += snprintf(ptr, end - ptr, "\n");
2304         /* return consumed bytes */
2305         rc = ptr - buf;
2306         RETURN(rc);
2307 }
2308
2309 int class_config_dump_handler(const struct lu_env *env,
2310                               struct llog_handle *handle,
2311                               struct llog_rec_hdr *rec, void *data)
2312 {
2313         char *outstr;
2314         int rc = 0;
2315
2316         ENTRY;
2317
2318         OBD_ALLOC(outstr, 256);
2319         if (!outstr)
2320                 RETURN(-ENOMEM);
2321
2322         if (rec->lrh_type == OBD_CFG_REC) {
2323                 class_config_parse_rec(rec, outstr, 256);
2324                 LCONSOLE(D_WARNING, "   %s\n", outstr);
2325         } else {
2326                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
2327                 rc = -EINVAL;
2328         }
2329
2330         OBD_FREE(outstr, 256);
2331         RETURN(rc);
2332 }
2333
2334 /**
2335  * Call class_cleanup and class_detach.
2336  * "Manual" only in the sense that we're faking lcfg commands.
2337  */
2338 int class_manual_cleanup(struct obd_device *obd)
2339 {
2340         char flags[3] = "";
2341         struct lustre_cfg *lcfg;
2342         struct lustre_cfg_bufs bufs;
2343         int rc;
2344
2345         ENTRY;
2346
2347         if (!obd) {
2348                 CERROR("empty cleanup\n");
2349                 RETURN(-EALREADY);
2350         }
2351
2352         if (obd->obd_force)
2353                 strlcat(flags, "F", sizeof(flags));
2354         if (obd->obd_fail)
2355                 strlcat(flags, "A", sizeof(flags));
2356
2357         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
2358                obd->obd_name, flags);
2359
2360         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
2361         lustre_cfg_bufs_set_string(&bufs, 1, flags);
2362         OBD_ALLOC(lcfg, lustre_cfg_len(bufs.lcfg_bufcount, bufs.lcfg_buflen));
2363         if (!lcfg)
2364                 RETURN(-ENOMEM);
2365         lustre_cfg_init(lcfg, LCFG_CLEANUP, &bufs);
2366
2367         rc = class_process_config(lcfg);
2368         if (rc) {
2369                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
2370                 GOTO(out, rc);
2371         }
2372
2373         /* the lcfg is almost the same for both ops */
2374         lcfg->lcfg_command = LCFG_DETACH;
2375         rc = class_process_config(lcfg);
2376         if (rc)
2377                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
2378 out:
2379         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
2380         RETURN(rc);
2381 }
2382 EXPORT_SYMBOL(class_manual_cleanup);
2383
2384 #ifdef HAVE_SERVER_SUPPORT
2385 /*
2386  * nid<->nidstats hash operations
2387  */
2388 static unsigned
2389 nidstats_hash(struct cfs_hash *hs, const void *key, unsigned int mask)
2390 {
2391         return cfs_hash_djb2_hash(key, sizeof(struct lnet_nid), mask);
2392 }
2393
2394 static void *
2395 nidstats_key(struct hlist_node *hnode)
2396 {
2397         struct nid_stat *ns;
2398
2399         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2400
2401         return &ns->nid;
2402 }
2403
2404 static int
2405 nidstats_keycmp(const void *key, struct hlist_node *hnode)
2406 {
2407         return nid_same((struct lnet_nid *)nidstats_key(hnode),
2408                          (struct lnet_nid *)key);
2409 }
2410
2411 static void *
2412 nidstats_object(struct hlist_node *hnode)
2413 {
2414         return hlist_entry(hnode, struct nid_stat, nid_hash);
2415 }
2416
2417 static void
2418 nidstats_get(struct cfs_hash *hs, struct hlist_node *hnode)
2419 {
2420         struct nid_stat *ns;
2421
2422         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2423         nidstat_getref(ns);
2424 }
2425
2426 static void
2427 nidstats_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2428 {
2429         struct nid_stat *ns;
2430
2431         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2432         nidstat_putref(ns);
2433 }
2434
2435 static struct cfs_hash_ops nid_stat_hash_ops = {
2436         .hs_hash        = nidstats_hash,
2437         .hs_key         = nidstats_key,
2438         .hs_keycmp      = nidstats_keycmp,
2439         .hs_object      = nidstats_object,
2440         .hs_get         = nidstats_get,
2441         .hs_put_locked  = nidstats_put_locked,
2442 };
2443
2444 /*
2445  * client_generation<->export hash operations
2446  */
2447
2448 static unsigned
2449 gen_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2450 {
2451         return cfs_hash_djb2_hash(key, sizeof(__u32), mask);
2452 }
2453
2454 static void *
2455 gen_key(struct hlist_node *hnode)
2456 {
2457         struct obd_export *exp;
2458
2459         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2460
2461         RETURN(&exp->exp_target_data.ted_lcd->lcd_generation);
2462 }
2463
2464 /*
2465  * NOTE: It is impossible to find an export that is in failed
2466  *       state with this function
2467  */
2468 static int
2469 gen_kepcmp(const void *key, struct hlist_node *hnode)
2470 {
2471         struct obd_export *exp;
2472
2473         LASSERT(key);
2474         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2475
2476         RETURN(exp->exp_target_data.ted_lcd->lcd_generation == *(__u32 *)key &&
2477                !exp->exp_failed);
2478 }
2479
2480 static void *
2481 gen_export_object(struct hlist_node *hnode)
2482 {
2483         return hlist_entry(hnode, struct obd_export, exp_gen_hash);
2484 }
2485
2486 static void
2487 gen_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
2488 {
2489         struct obd_export *exp;
2490
2491         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2492         class_export_get(exp);
2493 }
2494
2495 static void
2496 gen_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2497 {
2498         struct obd_export *exp;
2499
2500         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2501         class_export_put(exp);
2502 }
2503
2504 static struct cfs_hash_ops gen_hash_ops = {
2505         .hs_hash        = gen_hash,
2506         .hs_key         = gen_key,
2507         .hs_keycmp      = gen_kepcmp,
2508         .hs_object      = gen_export_object,
2509         .hs_get         = gen_export_get,
2510         .hs_put_locked  = gen_export_put_locked,
2511 };
2512
2513 #endif /* HAVE_SERVER_SUPPORT */