lustre/obdclass/obd_config.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/obdclass/obd_config.c
  32  *
  33  * Config API
  34  */
  35
  36 #define DEBUG_SUBSYSTEM S_CLASS
  37
  38 #include <linux/kobject.h>
  39 #include <linux/string.h>
  40
  41 #include <llog_swab.h>
  42 #include <lprocfs_status.h>
  43 #include <lustre_disk.h>
  44 #include <uapi/linux/lustre/lustre_ioctl.h>
  45 #include <lustre_log.h>
  46 #include <uapi/linux/lustre/lustre_param.h>
  47 #include <obd_class.h>
  48
  49 #include "llog_internal.h"
  50
  51 #ifdef HAVE_SERVER_SUPPORT
  52 static struct cfs_hash_ops nid_stat_hash_ops;
  53 static struct cfs_hash_ops gen_hash_ops;
  54 #endif /* HAVE_SERVER_SUPPORT */
  55
  56 /*
  57  * uuid<->export lustre hash operations
  58  */
  59 /*
  60  * NOTE: It is impossible to find an export that is in failed
  61  *      state with this function
  62  */
  63 static int
  64 uuid_keycmp(struct rhashtable_compare_arg *arg, const void *obj)
  65 {
  66         const struct obd_uuid *uuid = arg->key;
  67         const struct obd_export *exp = obj;
  68
  69         if (obd_uuid_equals(uuid, &exp->exp_client_uuid) &&
  70             !exp->exp_failed)
  71                 return 0;
  72         return -ESRCH;
  73 }
  74
  75 static void
  76 obd_export_exit(void *vexport, void *data)
  77 {
  78         struct obd_export *exp = vexport;
  79
  80         class_export_put(exp);
  81 }
  82
  83 static const struct rhashtable_params uuid_hash_params = {
  84         .key_len        = sizeof(struct obd_uuid),
  85         .key_offset     = offsetof(struct obd_export, exp_client_uuid),
  86         .head_offset    = offsetof(struct obd_export, exp_uuid_hash),
  87         .obj_cmpfn      = uuid_keycmp,
  88         .max_size       = MAX_OBD_DEVICES,
  89         .automatic_shrinking = true,
  90 };
  91
  92 int obd_uuid_add(struct obd_device *obd, struct obd_export *export)
  93 {
  94         int rc;
  95
  96         class_export_get(export);
  97         rcu_read_lock();
  98         rc = rhashtable_lookup_insert_fast(&obd->obd_uuid_hash,
  99                                            &export->exp_uuid_hash,
 100                                            uuid_hash_params);
 101         if (rc) {
 102                 class_export_put(export);
 103                 if (rc != -EEXIST) {
 104                         /* map obscure error codes to -ENOMEM */
 105                         rc = -ENOMEM;
 106                 } else {
 107                         rc = -EALREADY;
 108                 }
 109         }
 110         rcu_read_unlock();
 111
 112         return rc;
 113 }
 114 EXPORT_SYMBOL(obd_uuid_add);
 115
 116 void obd_uuid_del(struct obd_device *obd, struct obd_export *export)
 117 {
 118         int rc;
 119
 120         rcu_read_lock();
 121         rc = rhashtable_remove_fast(&obd->obd_uuid_hash,
 122                                     &export->exp_uuid_hash,
 123                                     uuid_hash_params);
 124         if (!rc)
 125                 class_export_put(export);
 126         rcu_read_unlock();
 127 }
 128 EXPORT_SYMBOL(obd_uuid_del);
 129
 130 #ifdef HAVE_SERVER_SUPPORT
 131 /* obd_uuid_lookup() is used only server side by target_handle_connect(),
 132  * mdt_hsm_agent_send(), and obd_export_evict_by_uuid().
 133  */
 134 struct obd_export *obd_uuid_lookup(struct obd_device *obd,
 135                                    struct obd_uuid *uuid)
 136 {
 137         struct obd_export *export = NULL;
 138
 139         rcu_read_lock();
 140         export = rhashtable_lookup_fast(&obd->obd_uuid_hash, uuid,
 141                                         uuid_hash_params);
 142         if (export && !refcount_inc_not_zero(&export->exp_handle.h_ref))
 143                 export = NULL;
 144         rcu_read_unlock();
 145
 146         return export;
 147 }
 148 EXPORT_SYMBOL(obd_uuid_lookup);
 149
 150 /*
 151  * nid<->export hash operations
 152  */
 153 static u32 nid_keyhash(const void *data, u32 key_len, u32 seed)
 154 {
 155         const struct obd_export *exp = data;
 156         void *key;
 157
 158         if (!exp->exp_connection)
 159                 return 0;
 160
 161         key = &exp->exp_connection->c_peer.nid;
 162         return jhash2(key, key_len / sizeof(u32), seed);
 163 }
 164
 165 /*
 166  * NOTE: It is impossible to find an export that is in failed
 167  *       state with this function
 168  */
 169 static int
 170 nid_keycmp(struct rhashtable_compare_arg *arg, const void *obj)
 171 {
 172         const struct lnet_nid *nid = arg->key;
 173         const struct obd_export *exp = obj;
 174
 175         if (nid_same(&exp->exp_connection->c_peer.nid, nid))
 176                 return 0;
 177
 178         return -ESRCH;
 179 }
 180
 181 static void
 182 nid_export_exit(void *vexport, void *data)
 183 {
 184         struct obd_export *exp = vexport;
 185
 186         class_export_put(exp);
 187 }
 188
 189 static const struct rhashtable_params nid_hash_params = {
 190         .key_len                = sizeof(struct lnet_nid),
 191         .head_offset            = offsetof(struct obd_export, exp_nid_hash),
 192         .obj_hashfn             = nid_keyhash,
 193         .obj_cmpfn              = nid_keycmp,
 194         .automatic_shrinking    = true,
 195 };
 196
 197 int obd_nid_add(struct obd_device *obd, struct obd_export *exp)
 198 {
 199         int rc;
 200
 201         if (exp == exp->exp_obd->obd_self_export || exp->exp_hashed)
 202                 return 0;
 203
 204         class_export_get(exp);
 205         rc = rhltable_insert_key(&obd->obd_nid_hash,
 206                                  &exp->exp_connection->c_peer.nid,
 207                                  &exp->exp_nid_hash,
 208                                  nid_hash_params);
 209         if (rc) {
 210                 class_export_put(exp);
 211                 /* map obscure error codes to -ENOMEM */
 212                 rc = -ENOMEM;
 213         } else {
 214                 exp->exp_hashed = 1;
 215         }
 216         return rc;
 217 }
 218 EXPORT_SYMBOL(obd_nid_add);
 219
 220 void obd_nid_del(struct obd_device *obd, struct obd_export *exp)
 221 {
 222         int rc;
 223
 224         if (exp == exp->exp_obd->obd_self_export || !exp->exp_hashed)
 225                 return;
 226
 227         rc = rhltable_remove(&obd->obd_nid_hash, &exp->exp_nid_hash,
 228                              nid_hash_params);
 229         if (rc == 0) {
 230                 class_export_put(exp);
 231                 exp->exp_hashed = 0;
 232         }
 233 }
 234 EXPORT_SYMBOL(obd_nid_del);
 235
 236 int obd_nid_export_for_each(struct obd_device *obd, struct lnet_nid *nid,
 237                             int cb(struct obd_export *exp, void *data),
 238                             void *data)
 239 {
 240         struct rhlist_head *exports, *tmp;
 241         struct obd_export *exp;
 242         int ret = 0;
 243
 244         rcu_read_lock();
 245         exports = rhltable_lookup(&obd->obd_nid_hash, nid, nid_hash_params);
 246         if (!exports) {
 247                 ret = -ENODEV;
 248                 goto out_unlock;
 249         }
 250
 251         rhl_for_each_entry_rcu(exp, tmp, exports, exp_nid_hash) {
 252                 if (!exp->exp_failed && cb(exp, data))
 253                         ret++;
 254         }
 255
 256 out_unlock:
 257         rcu_read_unlock();
 258         return ret;
 259 }
 260 EXPORT_SYMBOL(obd_nid_export_for_each);
 261 #endif /* HAVE_SERVER_SUPPORT */
 262
 263 /*********** string parsing utils *********/
 264
 265 /* returns 0 if we find this key in the buffer, else 1 */
 266 int class_find_param(char *buf, char *key, char **valp)
 267 {
 268         char *ptr;
 269
 270         if (!buf)
 271                 return 1;
 272
 273         ptr = strstr(buf, key);
 274         if (!ptr)
 275                 return 1;
 276
 277         if (valp)
 278                 *valp = ptr + strlen(key);
 279
 280         return 0;
 281 }
 282 EXPORT_SYMBOL(class_find_param);
 283
 284 /**
 285  * Check whether the proc parameter \a param is an old parameter or not from
 286  * the array \a ptr which contains the mapping from old parameters to new ones.
 287  * If it's an old one, then return the pointer to the cfg_interop_param struc-
 288  * ture which contains both the old and new parameters.
 289  *
 290  * \param param                 proc parameter
 291  * \param ptr                   an array which contains the mapping from
 292  *                              old parameters to new ones
 293  *
 294  * \retval valid-pointer        pointer to the cfg_interop_param structure
 295  *                              which contains the old and new parameters
 296  * \retval NULL                 \a param or \a ptr is NULL,
 297  *                              or \a param is not an old parameter
 298  */
 299 struct cfg_interop_param *class_find_old_param(const char *param,
 300                                                struct cfg_interop_param *ptr)
 301 {
 302         char *value = NULL;
 303         int   name_len = 0;
 304
 305         if (!param || !ptr)
 306                 RETURN(NULL);
 307
 308         value = strchr(param, '=');
 309         if (value)
 310                 name_len = value - param;
 311         else
 312                 name_len = strlen(param);
 313
 314         while (ptr->old_param) {
 315                 if (strncmp(param, ptr->old_param, name_len) == 0 &&
 316                     name_len == strlen(ptr->old_param))
 317                         RETURN(ptr);
 318                 ptr++;
 319         }
 320
 321         RETURN(NULL);
 322 }
 323 EXPORT_SYMBOL(class_find_old_param);
 324
 325 /**
 326  * Finds a parameter in \a params and copies it to \a copy.
 327  *
 328  * Leading spaces are skipped. Next space or end of string is the
 329  * parameter terminator with the exception that spaces inside single or double
 330  * quotes get included into a parameter. The parameter is copied into \a copy
 331  * which has to be allocated big enough by a caller, quotes are stripped in
 332  * the copy and the copy is terminated by 0.
 333  *
 334  * On return \a params is set to next parameter or to NULL if last
 335  * parameter is returned.
 336  *
 337  * \retval 0 if parameter is returned in \a copy
 338  * \retval 1 otherwise
 339  * \retval -EINVAL if unbalanced quota is found
 340  */
 341 int class_get_next_param(char **params, char *copy)
 342 {
 343         char *q1, *q2, *str;
 344         int len;
 345
 346         str = *params;
 347         while (*str == ' ')
 348                 str++;
 349
 350         if (*str == '\0') {
 351                 *params = NULL;
 352                 return 1;
 353         }
 354
 355         while (1) {
 356                 q1 = strpbrk(str, " '\"");
 357                 if (!q1) {
 358                         len = strlen(str);
 359                         memcpy(copy, str, len);
 360                         copy[len] = '\0';
 361                         *params = NULL;
 362                         return 0;
 363                 }
 364                 len = q1 - str;
 365                 if (*q1 == ' ') {
 366                         memcpy(copy, str, len);
 367                         copy[len] = '\0';
 368                         *params = str + len;
 369                         return 0;
 370                 }
 371
 372                 memcpy(copy, str, len);
 373                 copy += len;
 374
 375                 /* search for the matching closing quote */
 376                 str = q1 + 1;
 377                 q2 = strchr(str, *q1);
 378                 if (!q2) {
 379                         CERROR("Unbalanced quota in parameters: \"%s\"\n",
 380                                *params);
 381                         return -EINVAL;
 382                 }
 383                 len = q2 - str;
 384                 memcpy(copy, str, len);
 385                 copy += len;
 386                 str = q2 + 1;
 387         }
 388         return 1;
 389 }
 390 EXPORT_SYMBOL(class_get_next_param);
 391
 392 /*
 393  * returns 0 if this is the first key in the buffer, else 1.
 394  * valp points to first char after key.
 395  */
 396 int class_match_param(char *buf, const char *key, char **valp)
 397 {
 398         if (!buf)
 399                 return 1;
 400
 401         if (memcmp(buf, key, strlen(key)) != 0)
 402                 return 1;
 403
 404         if (valp)
 405                 *valp = buf + strlen(key);
 406
 407         return 0;
 408 }
 409 EXPORT_SYMBOL(class_match_param);
 410
 411 static int parse_nid(char *buf, void *value, int quiet)
 412 {
 413         lnet_nid_t *nid = (lnet_nid_t *)value;
 414
 415         *nid = libcfs_str2nid(buf);
 416         if (*nid != LNET_NID_ANY)
 417                 return 0;
 418
 419         if (!quiet)
 420                 LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
 421         return -EINVAL;
 422 }
 423
 424 static int parse_net(char *buf, void *value)
 425 {
 426         __u32 *net = (__u32 *)value;
 427
 428         *net = libcfs_str2net(buf);
 429         CDEBUG(D_INFO, "Net %s\n", libcfs_net2str(*net));
 430         return 0;
 431 }
 432
 433 enum {
 434         CLASS_PARSE_NID = 1,
 435         CLASS_PARSE_NET,
 436 };
 437
 438 /*
 439  * 0 is good NID,
 440  * 1 not found
 441  * < 0 error
 442  * endh is set to next separator
 443  */
 444 static int class_parse_value(char *buf, int opc, void *value, char **endh,
 445                              int quiet)
 446 {
 447         char *endp;
 448         char  tmp;
 449         int   rc = 0;
 450
 451         if (!buf)
 452                 return 1;
 453         while (*buf == ',' || *buf == ':')
 454                 buf++;
 455         if (*buf == ' ' || *buf == '/' || *buf == '\0')
 456                 return 1;
 457
 458         /* NID separators or end of NIDs */
 459         endp = strpbrk(buf, ",: /");
 460         if (!endp)
 461                 endp = buf + strlen(buf);
 462
 463         tmp = *endp;
 464         *endp = '\0';
 465         switch (opc) {
 466         default:
 467                 LBUG();
 468         case CLASS_PARSE_NID:
 469                 rc = parse_nid(buf, value, quiet);
 470                 break;
 471         case CLASS_PARSE_NET:
 472                 rc = parse_net(buf, value);
 473                 break;
 474         }
 475         *endp = tmp;
 476         if (rc != 0)
 477                 return rc;
 478         if (endh)
 479                 *endh = endp;
 480         return 0;
 481 }
 482
 483 int class_parse_nid(char *buf, lnet_nid_t *nid, char **endh)
 484 {
 485         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 0);
 486 }
 487 EXPORT_SYMBOL(class_parse_nid);
 488
 489 int class_parse_nid_quiet(char *buf, lnet_nid_t *nid, char **endh)
 490 {
 491         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 1);
 492 }
 493 EXPORT_SYMBOL(class_parse_nid_quiet);
 494
 495 int class_parse_net(char *buf, __u32 *net, char **endh)
 496 {
 497         return class_parse_value(buf, CLASS_PARSE_NET, (void *)net, endh, 0);
 498 }
 499
 500 /*
 501  * 1 param contains key and match
 502  * 0 param contains key and not match
 503  * -1 param does not contain key
 504  */
 505 int class_match_nid(char *buf, char *key, lnet_nid_t nid)
 506 {
 507         lnet_nid_t tmp;
 508         int rc = -1;
 509
 510         while (class_find_param(buf, key, &buf) == 0) {
 511                 /*
 512                  * please restrict to the NIDs pertaining to
 513                  * the specified NIDs
 514                  */
 515                 while (class_parse_nid(buf, &tmp, &buf) == 0) {
 516                         if (tmp == nid)
 517                                 return 1;
 518                 }
 519                 rc = 0;
 520         }
 521         return rc;
 522 }
 523 EXPORT_SYMBOL(class_match_nid);
 524
 525 int class_match_net(char *buf, char *key, __u32 net)
 526 {
 527         __u32 tmp;
 528         int rc = -1;
 529
 530         while (class_find_param(buf, key, &buf) == 0) {
 531                 /*
 532                  * please restrict to the NIDs pertaining to
 533                  * the specified networks
 534                  */
 535                 while (class_parse_net(buf, &tmp, &buf) == 0) {
 536                         if (tmp == net)
 537                                 return 1;
 538                 }
 539                 rc = 0;
 540         }
 541         return rc;
 542 }
 543 EXPORT_SYMBOL(class_match_net);
 544
 545 char *lustre_cfg_string(struct lustre_cfg *lcfg, u32 index)
 546 {
 547         char *s;
 548
 549         if (!lcfg->lcfg_buflens[index])
 550                 return NULL;
 551
 552         s = lustre_cfg_buf(lcfg, index);
 553         if (!s)
 554                 return NULL;
 555
 556         /*
 557          * make sure it's NULL terminated, even if this kills a char
 558          * of data.  Try to use the padding first though.
 559          */
 560         if (s[lcfg->lcfg_buflens[index] - 1] != '\0') {
 561                 size_t last = ALIGN(lcfg->lcfg_buflens[index], 8) - 1;
 562                 char lost;
 563
 564                 /* Use the smaller value */
 565                 if (last > lcfg->lcfg_buflens[index])
 566                         last = lcfg->lcfg_buflens[index];
 567
 568                 lost = s[last];
 569                 s[last] = '\0';
 570                 if (lost != '\0') {
 571                         CWARN("Truncated buf %d to '%s' (lost '%c'...)\n",
 572                               index, s, lost);
 573                 }
 574         }
 575         return s;
 576 }
 577 EXPORT_SYMBOL(lustre_cfg_string);
 578
 579 /********************** class fns **********************/
 580
 581 /**
 582  * Create a new OBD device and set the type, name and uuid.  If successful,
 583  * the new device can be accessed by either name or uuid.
 584  */
 585 int class_attach(struct lustre_cfg *lcfg)
 586 {
 587         struct obd_export *exp;
 588         struct obd_device *obd = NULL;
 589         char *typename, *name, *uuid;
 590         int rc, len;
 591
 592         ENTRY;
 593
 594         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 595                 CERROR("No type passed!\n");
 596                 RETURN(-EINVAL);
 597         }
 598         typename = lustre_cfg_string(lcfg, 1);
 599
 600         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 601                 CERROR("No name passed!\n");
 602                 RETURN(-EINVAL);
 603         }
 604         name = lustre_cfg_string(lcfg, 0);
 605         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 606                 CERROR("No UUID passed!\n");
 607                 RETURN(-EINVAL);
 608         }
 609
 610         uuid = lustre_cfg_string(lcfg, 2);
 611         len = strlen(uuid);
 612         if (len >= sizeof(obd->obd_uuid)) {
 613                 CERROR("%s: uuid must be < %d bytes long\n",
 614                        name, (int)sizeof(obd->obd_uuid));
 615                 RETURN(-EINVAL);
 616         }
 617
 618         obd = class_newdev(typename, name, uuid);
 619         if (IS_ERR(obd)) { /* Already exists or out of obds */
 620                 rc = PTR_ERR(obd);
 621                 CERROR("Cannot create device %s of type %s : %d\n",
 622                        name, typename, rc);
 623                 RETURN(rc);
 624         }
 625         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 626                  "obd %p obd_magic %08X != %08X\n",
 627                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 628         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 629                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 630
 631         exp = class_new_export_self(obd, &obd->obd_uuid);
 632         if (IS_ERR(exp)) {
 633                 rc = PTR_ERR(exp);
 634                 class_free_dev(obd);
 635                 RETURN(rc);
 636         }
 637
 638         obd->obd_self_export = exp;
 639         list_del_init(&exp->exp_obd_chain_timed);
 640         class_export_put(exp);
 641
 642         rc = class_register_device(obd);
 643         if (rc != 0) {
 644                 class_decref(obd, "newdev", obd);
 645                 RETURN(rc);
 646         }
 647
 648         obd->obd_attached = 1;
 649         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 650                obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
 651
 652         RETURN(0);
 653 }
 654 EXPORT_SYMBOL(class_attach);
 655
 656 /**
 657  * Create hashes, self-export, and call type-specific setup.
 658  * Setup is effectively the "start this obd" call.
 659  */
 660 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 661 {
 662         int err = 0;
 663
 664         ENTRY;
 665
 666         LASSERT(obd != NULL);
 667         LASSERTF(obd == class_num2obd(obd->obd_minor),
 668                  "obd %p != obd_devs[%d] %p\n",
 669                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 670         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 671                  "obd %p obd_magic %08x != %08x\n",
 672                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 673
 674         /* have we attached a type to this device? */
 675         if (!obd->obd_attached) {
 676                 CERROR("Device %d not attached\n", obd->obd_minor);
 677                 RETURN(-ENODEV);
 678         }
 679
 680         if (obd->obd_set_up) {
 681                 CERROR("Device %d already setup (type %s)\n",
 682                        obd->obd_minor, obd->obd_type->typ_name);
 683                 RETURN(-EEXIST);
 684         }
 685
 686         /* is someone else setting us up right now? (attach inits spinlock) */
 687         spin_lock(&obd->obd_dev_lock);
 688         if (obd->obd_starting) {
 689                 spin_unlock(&obd->obd_dev_lock);
 690                 CERROR("Device %d setup in progress (type %s)\n",
 691                        obd->obd_minor, obd->obd_type->typ_name);
 692                 RETURN(-EEXIST);
 693         }
 694         /*
 695          * just leave this on forever.  I can't use obd_set_up here because
 696          * other fns check that status, and we're not actually set up yet.
 697          */
 698         obd->obd_starting = 1;
 699         obd->obd_nid_stats_hash = NULL;
 700         obd->obd_gen_hash = NULL;
 701         spin_unlock(&obd->obd_dev_lock);
 702
 703         /* create an uuid-export lustre hash */
 704         err = rhashtable_init(&obd->obd_uuid_hash, &uuid_hash_params);
 705         if (err)
 706                 GOTO(err_starting, err);
 707
 708 #ifdef HAVE_SERVER_SUPPORT
 709         /* create a nid-export lustre hash */
 710         err = rhltable_init(&obd->obd_nid_hash, &nid_hash_params);
 711         if (err)
 712                 GOTO(err_uuid_hash, err = -ENOMEM);
 713
 714         /* create a nid-stats lustre hash */
 715         obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
 716                                                   HASH_NID_STATS_CUR_BITS,
 717                                                   HASH_NID_STATS_MAX_BITS,
 718                                                   HASH_NID_STATS_BKT_BITS, 0,
 719                                                   CFS_HASH_MIN_THETA,
 720                                                   CFS_HASH_MAX_THETA,
 721                                                   &nid_stat_hash_ops,
 722                                                   CFS_HASH_DEFAULT);
 723         if (!obd->obd_nid_stats_hash)
 724                 GOTO(err_nid_hash, err = -ENOMEM);
 725
 726         /* create a client_generation-export lustre hash */
 727         obd->obd_gen_hash = cfs_hash_create("UUID_HASH",
 728                                             HASH_GEN_CUR_BITS,
 729                                             HASH_GEN_MAX_BITS,
 730                                             HASH_GEN_BKT_BITS, 0,
 731                                             CFS_HASH_MIN_THETA,
 732                                             CFS_HASH_MAX_THETA,
 733                                             &gen_hash_ops, CFS_HASH_DEFAULT);
 734         if (!obd->obd_gen_hash)
 735                 GOTO(err_nid_stats_hash, err = -ENOMEM);
 736 #endif /* HAVE_SERVER_SUPPORT */
 737
 738         err = obd_setup(obd, lcfg);
 739         if (err)
 740 #ifdef HAVE_SERVER_SUPPORT
 741                 GOTO(err_gen_hash, err);
 742 #else
 743                 GOTO(err_uuid_hash, err);
 744 #endif /* ! HAVE_SERVER_SUPPORT */
 745
 746         obd->obd_set_up = 1;
 747
 748         spin_lock(&obd->obd_dev_lock);
 749         /* cleanup drops this */
 750         class_incref(obd, "setup", obd);
 751         spin_unlock(&obd->obd_dev_lock);
 752
 753         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 754                obd->obd_name, obd->obd_uuid.uuid);
 755
 756         RETURN(0);
 757
 758 #ifdef HAVE_SERVER_SUPPORT
 759 err_gen_hash:
 760         if (obd->obd_gen_hash) {
 761                 cfs_hash_putref(obd->obd_gen_hash);
 762                 obd->obd_gen_hash = NULL;
 763         }
 764 err_nid_stats_hash:
 765         if (obd->obd_nid_stats_hash) {
 766                 cfs_hash_putref(obd->obd_nid_stats_hash);
 767                 obd->obd_nid_stats_hash = NULL;
 768         }
 769 err_nid_hash:
 770         rhltable_destroy(&obd->obd_nid_hash);
 771 #endif /* HAVE_SERVER_SUPPORT */
 772 err_uuid_hash:
 773         rhashtable_destroy(&obd->obd_uuid_hash);
 774 err_starting:
 775         obd->obd_starting = 0;
 776         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 777         return err;
 778 }
 779 EXPORT_SYMBOL(class_setup);
 780
 781 /**
 782  * We have finished using this OBD and are ready to destroy it.
 783  * There can be no more references to this obd.
 784  */
 785 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 786 {
 787         ENTRY;
 788
 789         if (obd->obd_set_up) {
 790                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 791                 RETURN(-EBUSY);
 792         }
 793
 794         spin_lock(&obd->obd_dev_lock);
 795         if (!obd->obd_attached) {
 796                 spin_unlock(&obd->obd_dev_lock);
 797                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 798                 RETURN(-ENODEV);
 799         }
 800         obd->obd_attached = 0;
 801         spin_unlock(&obd->obd_dev_lock);
 802
 803         /* cleanup in progress. we don't like to find this device after now */
 804         class_unregister_device(obd);
 805
 806         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 807                obd->obd_name, obd->obd_uuid.uuid);
 808
 809         class_decref(obd, "newdev", obd);
 810
 811         RETURN(0);
 812 }
 813 EXPORT_SYMBOL(class_detach);
 814
 815 /**
 816  * Start shutting down the OBD.  There may be in-progess ops when
 817  * this is called.  We tell them to start shutting down with a call
 818  * to class_disconnect_exports().
 819  */
 820 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 821 {
 822         int err = 0;
 823         char *flag;
 824         ENTRY;
 825
 826         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 827
 828         if (!obd->obd_set_up) {
 829                 CERROR("Device %d not setup\n", obd->obd_minor);
 830                 RETURN(-ENODEV);
 831         }
 832
 833         spin_lock(&obd->obd_dev_lock);
 834         if (obd->obd_stopping) {
 835                 spin_unlock(&obd->obd_dev_lock);
 836                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 837                 RETURN(-ENODEV);
 838         }
 839         /* Leave this on forever */
 840         obd->obd_stopping = 1;
 841         spin_unlock(&obd->obd_dev_lock);
 842
 843         /* wait for already-arrived-connections to finish. */
 844         while (obd->obd_conn_inprogress > 0)
 845                 yield();
 846         smp_rmb();
 847
 848         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 849                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 850                         switch (*flag) {
 851                         case 'F':
 852                                 obd->obd_force = 1;
 853                                 break;
 854                         case 'A':
 855                                 LCONSOLE_WARN("Failing over %s\n",
 856                                               obd->obd_name);
 857                                 spin_lock(&obd->obd_dev_lock);
 858                                 obd->obd_fail = 1;
 859 #ifdef HAVE_SERVER_SUPPORT
 860                                 obd->obd_no_transno = 1;
 861 #endif
 862                                 obd->obd_no_recov = 1;
 863                                 spin_unlock(&obd->obd_dev_lock);
 864                                 if (OBP(obd, iocontrol)) {
 865                                         obd_iocontrol(OBD_IOC_SYNC,
 866                                                       obd->obd_self_export,
 867                                                       0, NULL, NULL);
 868                                 }
 869                                 break;
 870                         default:
 871                                 CERROR("Unrecognised flag '%c'\n", *flag);
 872                         }
 873         }
 874
 875         LASSERT(obd->obd_self_export);
 876
 877         CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d/%d\n",
 878                obd->obd_name, obd->obd_num_exports,
 879                atomic_read(&obd->obd_refcount) - 2);
 880         dump_exports(obd, 0, D_HA);
 881         class_disconnect_exports(obd);
 882
 883         /* Precleanup, we must make sure all exports get destroyed. */
 884         err = obd_precleanup(obd);
 885         if (err)
 886                 CERROR("Precleanup %s returned %d\n",
 887                        obd->obd_name, err);
 888
 889         /* destroy an uuid-export hash body */
 890         rhashtable_free_and_destroy(&obd->obd_uuid_hash, obd_export_exit,
 891                                     NULL);
 892 #ifdef HAVE_SERVER_SUPPORT
 893         /* destroy a nid-export hash body */
 894         rhltable_free_and_destroy(&obd->obd_nid_hash, nid_export_exit, NULL);
 895
 896         /* destroy a nid-stats hash body */
 897         if (obd->obd_nid_stats_hash) {
 898                 cfs_hash_putref(obd->obd_nid_stats_hash);
 899                 obd->obd_nid_stats_hash = NULL;
 900         }
 901
 902         /* destroy a client_generation-export hash body */
 903         if (obd->obd_gen_hash) {
 904                 cfs_hash_putref(obd->obd_gen_hash);
 905                 obd->obd_gen_hash = NULL;
 906         }
 907 #endif /* HAVE_SERVER_SUPPORT */
 908         class_decref(obd, "setup", obd);
 909         obd->obd_set_up = 0;
 910
 911         RETURN(0);
 912 }
 913
 914 struct obd_device *class_incref(struct obd_device *obd,
 915                                 const char *scope,
 916                                 const void *source)
 917 {
 918         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 919         atomic_inc(&obd->obd_refcount);
 920         CDEBUG(D_INFO, "incref %s (%p) now %d - %s\n", obd->obd_name, obd,
 921                atomic_read(&obd->obd_refcount), scope);
 922
 923         return obd;
 924 }
 925 EXPORT_SYMBOL(class_incref);
 926
 927 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 928 {
 929         int last;
 930
 931         CDEBUG(D_INFO, "Decref %s (%p) now %d - %s\n", obd->obd_name, obd,
 932                atomic_read(&obd->obd_refcount), scope);
 933
 934         LASSERT(obd->obd_num_exports >= 0);
 935         last = atomic_dec_and_test(&obd->obd_refcount);
 936         lu_ref_del(&obd->obd_reference, scope, source);
 937
 938         if (last) {
 939                 struct obd_export *exp;
 940
 941                 LASSERT(!obd->obd_attached);
 942                 /*
 943                  * All exports have been destroyed; there should
 944                  * be no more in-progress ops by this point.
 945                  */
 946                 exp = obd->obd_self_export;
 947
 948                 if (exp) {
 949                         exp->exp_flags |= exp_flags_from_obd(obd);
 950                         class_unlink_export(exp);
 951                 }
 952         }
 953 }
 954 EXPORT_SYMBOL(class_decref);
 955
 956 /**
 957  * Add a failover NID location.
 958  * Client OBD types contact server OBD types using this NID list.
 959  */
 960 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 961 {
 962         struct obd_import *imp;
 963         struct obd_uuid uuid;
 964         int rc;
 965
 966         ENTRY;
 967
 968         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 969             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 970                 CERROR("invalid conn_uuid\n");
 971                 RETURN(-EINVAL);
 972         }
 973         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 974             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
 975             strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) &&
 976             strcmp(obd->obd_type->typ_name, LUSTRE_LWP_NAME) &&
 977             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
 978                 CERROR("can't add connection on non-client dev\n");
 979                 RETURN(-EINVAL);
 980         }
 981
 982         imp = obd->u.cli.cl_import;
 983         if (!imp) {
 984                 CERROR("try to add conn on immature client dev\n");
 985                 RETURN(-EINVAL);
 986         }
 987
 988         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 989         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
 990
 991         RETURN(rc);
 992 }
 993 EXPORT_SYMBOL(class_add_conn);
 994
 995 /** Remove a failover NID location. */
 996 static int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 997 {
 998         struct obd_import *imp;
 999         struct obd_uuid uuid;
1000         int rc;
1001
1002         ENTRY;
1003
1004         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
1005             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
1006                 CERROR("invalid conn_uuid\n");
1007                 RETURN(-EINVAL);
1008         }
1009         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
1010             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
1011                 CERROR("can't del connection on non-client dev\n");
1012                 RETURN(-EINVAL);
1013         }
1014
1015         imp = obd->u.cli.cl_import;
1016         if (!imp) {
1017                 CERROR("try to del conn on immature client dev\n");
1018                 RETURN(-EINVAL);
1019         }
1020
1021         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
1022         rc = obd_del_conn(imp, &uuid);
1023
1024         RETURN(rc);
1025 }
1026
1027 static LIST_HEAD(lustre_profile_list);
1028 static DEFINE_SPINLOCK(lustre_profile_list_lock);
1029
1030 static struct lustre_profile *class_get_profile_nolock(const char *prof)
1031 {
1032         struct lustre_profile *lprof;
1033
1034         ENTRY;
1035         list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
1036                 if (strcmp(lprof->lp_profile, prof) == 0) {
1037                         lprof->lp_refs++;
1038                         RETURN(lprof);
1039                 }
1040         }
1041         RETURN(NULL);
1042 }
1043
1044 struct lustre_profile *class_get_profile(const char *prof)
1045 {
1046         struct lustre_profile *lprof;
1047
1048         ENTRY;
1049         spin_lock(&lustre_profile_list_lock);
1050         lprof = class_get_profile_nolock(prof);
1051         spin_unlock(&lustre_profile_list_lock);
1052         RETURN(lprof);
1053 }
1054 EXPORT_SYMBOL(class_get_profile);
1055
1056 /**
1057  * Create a named "profile".
1058  * This defines the MDC and OSC names to use for a client.
1059  * This also is used to define the LOV to be used by a MDT.
1060  */
1061 static int class_add_profile(int proflen, char *prof, int osclen, char *osc,
1062                              int mdclen, char *mdc)
1063 {
1064         struct lustre_profile *lprof;
1065         int err = 0;
1066
1067         ENTRY;
1068
1069         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
1070
1071         OBD_ALLOC(lprof, sizeof(*lprof));
1072         if (!lprof)
1073                 RETURN(-ENOMEM);
1074         INIT_LIST_HEAD(&lprof->lp_list);
1075
1076         LASSERT(proflen == (strlen(prof) + 1));
1077         OBD_ALLOC(lprof->lp_profile, proflen);
1078         if (!lprof->lp_profile)
1079                 GOTO(out, err = -ENOMEM);
1080         memcpy(lprof->lp_profile, prof, proflen);
1081
1082         LASSERT(osclen == (strlen(osc) + 1));
1083         OBD_ALLOC(lprof->lp_dt, osclen);
1084         if (!lprof->lp_dt)
1085                 GOTO(out, err = -ENOMEM);
1086         memcpy(lprof->lp_dt, osc, osclen);
1087
1088         if (mdclen > 0) {
1089                 LASSERT(mdclen == (strlen(mdc) + 1));
1090                 OBD_ALLOC(lprof->lp_md, mdclen);
1091                 if (!lprof->lp_md)
1092                         GOTO(out, err = -ENOMEM);
1093                 memcpy(lprof->lp_md, mdc, mdclen);
1094         }
1095
1096         spin_lock(&lustre_profile_list_lock);
1097         lprof->lp_refs = 1;
1098         lprof->lp_list_deleted = false;
1099
1100         list_add(&lprof->lp_list, &lustre_profile_list);
1101         spin_unlock(&lustre_profile_list_lock);
1102         RETURN(err);
1103
1104 out:
1105         if (lprof->lp_md)
1106                 OBD_FREE(lprof->lp_md, mdclen);
1107         if (lprof->lp_dt)
1108                 OBD_FREE(lprof->lp_dt, osclen);
1109         if (lprof->lp_profile)
1110                 OBD_FREE(lprof->lp_profile, proflen);
1111         OBD_FREE(lprof, sizeof(*lprof));
1112         RETURN(err);
1113 }
1114
1115 void class_del_profile(const char *prof)
1116 {
1117         struct lustre_profile *lprof;
1118
1119         ENTRY;
1120
1121         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
1122
1123         spin_lock(&lustre_profile_list_lock);
1124         lprof = class_get_profile_nolock(prof);
1125         if (lprof) {
1126                 /* because get profile increments the ref counter */
1127                 lprof->lp_refs--;
1128                 list_del(&lprof->lp_list);
1129                 lprof->lp_list_deleted = true;
1130                 spin_unlock(&lustre_profile_list_lock);
1131
1132                 class_put_profile(lprof);
1133         } else {
1134                 spin_unlock(&lustre_profile_list_lock);
1135         }
1136         EXIT;
1137 }
1138 EXPORT_SYMBOL(class_del_profile);
1139
1140 void class_put_profile(struct lustre_profile *lprof)
1141 {
1142         spin_lock(&lustre_profile_list_lock);
1143         if ((--lprof->lp_refs) > 0) {
1144                 LASSERT(lprof->lp_refs > 0);
1145                 spin_unlock(&lustre_profile_list_lock);
1146                 return;
1147         }
1148         spin_unlock(&lustre_profile_list_lock);
1149
1150         /* confirm not a negative number */
1151         LASSERT(lprof->lp_refs == 0);
1152
1153         /*
1154          * At least one class_del_profile/profiles must be called
1155          * on the target profile or lustre_profile_list will corrupt
1156          */
1157         LASSERT(lprof->lp_list_deleted);
1158         OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
1159         OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
1160         if (lprof->lp_md)
1161                 OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
1162         OBD_FREE(lprof, sizeof(*lprof));
1163 }
1164 EXPORT_SYMBOL(class_put_profile);
1165
1166 /* COMPAT_146 */
1167 void class_del_profiles(void)
1168 {
1169         struct lustre_profile *lprof, *n;
1170         ENTRY;
1171
1172         spin_lock(&lustre_profile_list_lock);
1173         list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
1174                 list_del(&lprof->lp_list);
1175                 lprof->lp_list_deleted = true;
1176                 spin_unlock(&lustre_profile_list_lock);
1177
1178                 class_put_profile(lprof);
1179
1180                 spin_lock(&lustre_profile_list_lock);
1181         }
1182         spin_unlock(&lustre_profile_list_lock);
1183         EXIT;
1184 }
1185 EXPORT_SYMBOL(class_del_profiles);
1186
1187 /*
1188  * We can't call lquota_process_config directly because
1189  * it lives in a module that must be loaded after this one.
1190  */
1191 #ifdef HAVE_SERVER_SUPPORT
1192 static int (*quota_process_config)(struct lustre_cfg *lcfg) = NULL;
1193 #endif /* HAVE_SERVER_SUPPORT */
1194
1195 /**
1196  * Rename the proc parameter in \a cfg with a new name \a new_name.
1197  *
1198  * \param cfg      config structure which contains the proc parameter
1199  * \param new_name new name of the proc parameter
1200  *
1201  * \retval valid-pointer    pointer to the newly-allocated config structure
1202  *                          which contains the renamed proc parameter
1203  * \retval ERR_PTR(-EINVAL) if \a cfg or \a new_name is NULL, or \a cfg does
1204  *                          not contain a proc parameter
1205  * \retval ERR_PTR(-ENOMEM) if memory allocation failure occurs
1206  */
1207 struct lustre_cfg *lustre_cfg_rename(struct lustre_cfg *cfg,
1208                                      const char *new_name)
1209 {
1210         struct lustre_cfg_bufs *bufs = NULL;
1211         struct lustre_cfg *new_cfg = NULL;
1212         char *param = NULL;
1213         char *new_param = NULL;
1214         char *value = NULL;
1215         int name_len = 0;
1216         int new_len = 0;
1217
1218         ENTRY;
1219
1220         if (!cfg || !new_name)
1221                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1222
1223         param = lustre_cfg_string(cfg, 1);
1224         if (!param)
1225                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1226
1227         value = strchr(param, '=');
1228         if (value)
1229                 name_len = value - param;
1230         else
1231                 name_len = strlen(param);
1232
1233         new_len = LUSTRE_CFG_BUFLEN(cfg, 1) + strlen(new_name) - name_len;
1234
1235         OBD_ALLOC(new_param, new_len);
1236         if (!new_param)
1237                 GOTO(out_nocfg, new_cfg = ERR_PTR(-ENOMEM));
1238
1239         strlcpy(new_param, new_name, new_len);
1240         if (value)
1241                 strcat(new_param, value);
1242
1243         OBD_ALLOC_PTR(bufs);
1244         if (!bufs)
1245                 GOTO(out_free_param, new_cfg = ERR_PTR(-ENOMEM));
1246
1247         lustre_cfg_bufs_reset(bufs, NULL);
1248         lustre_cfg_bufs_init(bufs, cfg);
1249         lustre_cfg_bufs_set_string(bufs, 1, new_param);
1250
1251         OBD_ALLOC(new_cfg, lustre_cfg_len(bufs->lcfg_bufcount,
1252                                           bufs->lcfg_buflen));
1253         if (!new_cfg)
1254                 GOTO(out_free_buf, new_cfg = ERR_PTR(-ENOMEM));
1255
1256         lustre_cfg_init(new_cfg, cfg->lcfg_command, bufs);
1257
1258         new_cfg->lcfg_num = cfg->lcfg_num;
1259         new_cfg->lcfg_flags = cfg->lcfg_flags;
1260         new_cfg->lcfg_nid = cfg->lcfg_nid;
1261         new_cfg->lcfg_nal = cfg->lcfg_nal;
1262 out_free_buf:
1263         OBD_FREE_PTR(bufs);
1264 out_free_param:
1265         OBD_FREE(new_param, new_len);
1266 out_nocfg:
1267         RETURN(new_cfg);
1268 }
1269 EXPORT_SYMBOL(lustre_cfg_rename);
1270
1271 static ssize_t process_param2_config(struct lustre_cfg *lcfg)
1272 {
1273         char *param = lustre_cfg_string(lcfg, 1);
1274         char *upcall = lustre_cfg_string(lcfg, 2);
1275         struct kobject *kobj = NULL;
1276         const char *subsys = param;
1277         char *newparam = NULL;
1278         char *argv[] = {
1279                 [0] = "/usr/sbin/lctl",
1280                 [1] = "set_param",
1281                 [2] = param,
1282                 [3] = NULL
1283         };
1284         ktime_t start;
1285         ktime_t end;
1286         size_t len;
1287         int rc;
1288
1289         ENTRY;
1290         print_lustre_cfg(lcfg);
1291
1292         len = strcspn(param, ".=");
1293         if (!len)
1294                 RETURN(-EINVAL);
1295
1296         /* If we find '=' then its the top level sysfs directory */
1297         if (param[len] == '=')
1298                 RETURN(class_set_global(param));
1299
1300         subsys = kstrndup(param, len, GFP_KERNEL);
1301         if (!subsys)
1302                 RETURN(-ENOMEM);
1303
1304         kobj = kset_find_obj(lustre_kset, subsys);
1305         kfree(subsys);
1306         if (kobj) {
1307                 char *value = param;
1308                 char *envp[4];
1309                 int i;
1310
1311                 param = strsep(&value, "=");
1312                 envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s", param);
1313                 envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1314                 envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1315                                     ktime_get_real_seconds());
1316                 envp[3] = NULL;
1317
1318                 rc = kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
1319                 for (i = 0; i < ARRAY_SIZE(envp); i++)
1320                         kfree(envp[i]);
1321
1322                 kobject_put(kobj);
1323
1324                 RETURN(rc);
1325         }
1326
1327         /* Add upcall processing here. Now only lctl is supported */
1328         if (strcmp(upcall, LCTL_UPCALL) != 0) {
1329                 CERROR("Unsupported upcall %s\n", upcall);
1330                 RETURN(-EINVAL);
1331         }
1332
1333         /* root_squash and nosquash_nids settings must be applied to
1334          * global subsystem (*.) so that it is taken into account by
1335          * both client and server sides. So do the equivalent of a
1336          * 's / mdt. / *. /'.
1337          */
1338         if ((strstr(param, PARAM_NOSQUASHNIDS) ||
1339              strstr(param, PARAM_ROOTSQUASH)) &&
1340             (param[0] != '*' || param[1] != '.')) {
1341                 newparam = kmalloc(strlen(param) + 1, GFP_NOFS);
1342                 if (!newparam)
1343                         RETURN(-ENOMEM);
1344
1345                 snprintf(newparam, strlen(param) + 1, "*%s", param + len);
1346                 argv[2] = (char *)newparam;
1347         }
1348
1349         start = ktime_get();
1350         rc = call_usermodehelper(argv[0], argv, NULL, UMH_WAIT_PROC);
1351         end = ktime_get();
1352
1353         if (rc < 0) {
1354                 CERROR("lctl: error invoking upcall %s %s %s: rc = %d; "
1355                        "time %ldus\n", argv[0], argv[1], argv[2], rc,
1356                        (long)ktime_us_delta(end, start));
1357         } else {
1358                 CDEBUG(D_HA, "lctl: invoked upcall %s %s %s, time %ldus\n",
1359                        argv[0], argv[1], argv[2],
1360                        (long)ktime_us_delta(end, start));
1361                        rc = 0;
1362         }
1363
1364         kfree(newparam);
1365         RETURN(rc);
1366 }
1367
1368 #ifdef HAVE_SERVER_SUPPORT
1369 void lustre_register_quota_process_config(int (*qpc)(struct lustre_cfg *lcfg))
1370 {
1371         quota_process_config = qpc;
1372 }
1373 EXPORT_SYMBOL(lustre_register_quota_process_config);
1374 #endif /* HAVE_SERVER_SUPPORT */
1375
1376 /**
1377  * Process configuration commands given in lustre_cfg form.
1378  * These may come from direct calls (e.g. class_manual_cleanup)
1379  * or processing the config llog, or ioctl from lctl.
1380  */
1381 int class_process_config(struct lustre_cfg *lcfg)
1382 {
1383         struct obd_device *obd;
1384         int err;
1385
1386         LASSERT(lcfg && !IS_ERR(lcfg));
1387         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
1388
1389         /* Commands that don't need a device */
1390         switch (lcfg->lcfg_command) {
1391         case LCFG_ATTACH: {
1392                 err = class_attach(lcfg);
1393                 GOTO(out, err);
1394         }
1395         case LCFG_ADD_UUID: {
1396                 CDEBUG(D_IOCTL,
1397                        "adding mapping from uuid %s to nid %#llx (%s)\n",
1398                        lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid,
1399                        libcfs_nid2str(lcfg->lcfg_nid));
1400
1401                 err = class_add_uuid(lustre_cfg_string(lcfg, 1),
1402                                      lcfg->lcfg_nid);
1403                 GOTO(out, err);
1404         }
1405         case LCFG_DEL_UUID: {
1406                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
1407                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) ==
1408                         0) ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
1409
1410                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
1411                 GOTO(out, err);
1412         }
1413         case LCFG_MOUNTOPT: {
1414                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
1415                        lustre_cfg_string(lcfg, 1),
1416                        lustre_cfg_string(lcfg, 2),
1417                        lustre_cfg_string(lcfg, 3));
1418                 /*
1419                  * set these mount options somewhere, so ll_fill_super
1420                  * can find them.
1421                  */
1422                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
1423                                         lustre_cfg_string(lcfg, 1),
1424                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
1425                                         lustre_cfg_string(lcfg, 2),
1426                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
1427                                         lustre_cfg_string(lcfg, 3));
1428                 GOTO(out, err);
1429         }
1430         case LCFG_DEL_MOUNTOPT: {
1431                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
1432                        lustre_cfg_string(lcfg, 1));
1433                 class_del_profile(lustre_cfg_string(lcfg, 1));
1434                 GOTO(out, err = 0);
1435         }
1436         case LCFG_SET_TIMEOUT: {
1437                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
1438                        obd_timeout, lcfg->lcfg_num);
1439                 obd_timeout = max(lcfg->lcfg_num, 1U);
1440                 ping_interval = max(obd_timeout / 4, 1U);
1441                 obd_timeout_set = 1;
1442                 GOTO(out, err = 0);
1443         }
1444         case LCFG_SET_LDLM_TIMEOUT: {
1445                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
1446                        ldlm_timeout, lcfg->lcfg_num);
1447                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
1448                 if (ldlm_timeout >= obd_timeout)
1449                         ldlm_timeout = max(obd_timeout / 3, 1U);
1450                 ldlm_timeout_set = 1;
1451                 GOTO(out, err = 0);
1452         }
1453         case LCFG_SET_UPCALL: {
1454                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
1455                 /* COMPAT_146 Don't fail on old configs */
1456                 GOTO(out, err = 0);
1457         }
1458         case LCFG_MARKER: {
1459                 struct cfg_marker *marker;
1460
1461                 marker = lustre_cfg_buf(lcfg, 1);
1462                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
1463                        marker->cm_flags, marker->cm_tgtname,
1464                        marker->cm_comment);
1465                 GOTO(out, err = 0);
1466         }
1467         case LCFG_PARAM: {
1468                 char *tmp;
1469
1470                 /* llite has no OBD */
1471                 if (class_match_param(lustre_cfg_string(lcfg, 1),
1472                                       PARAM_LLITE, NULL) == 0) {
1473                         struct lustre_sb_info *lsi;
1474                         unsigned long addr;
1475                         ssize_t count;
1476
1477                         /*
1478                          * The instance name contains the sb:
1479                          * lustre-client-aacfe000
1480                          */
1481                         tmp = strrchr(lustre_cfg_string(lcfg, 0), '-');
1482                         if (!tmp || !*(++tmp))
1483                                 GOTO(out, err = -EINVAL);
1484
1485                         if (sscanf(tmp, "%lx", &addr) != 1)
1486                                 GOTO(out, err = -EINVAL);
1487
1488                         lsi = s2lsi((struct super_block *)addr);
1489                         /* This better be a real Lustre superblock! */
1490                         LASSERT(lsi->lsi_lmd->lmd_magic == LMD_MAGIC);
1491
1492                         count = class_modify_config(lcfg, PARAM_LLITE,
1493                                                     lsi->lsi_kobj);
1494                         err = count < 0 ? count : 0;
1495                         GOTO(out, err);
1496                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1497                                               PARAM_SYS, &tmp) == 0)) {
1498                         /* Global param settings */
1499                         err = class_set_global(tmp);
1500                         /*
1501                          * Client or server should not fail to mount if
1502                          * it hits an unknown configuration parameter.
1503                          */
1504                         if (err < 0)
1505                                 CWARN("Ignoring unknown param %s\n", tmp);
1506
1507                         GOTO(out, err = 0);
1508 #ifdef HAVE_SERVER_SUPPORT
1509                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1510                                               PARAM_QUOTA, &tmp) == 0) &&
1511                            quota_process_config) {
1512                         err = (*quota_process_config)(lcfg);
1513                         GOTO(out, err);
1514 #endif /* HAVE_SERVER_SUPPORT */
1515                 }
1516
1517                 break;
1518         }
1519         case LCFG_SET_PARAM: {
1520                 err = process_param2_config(lcfg);
1521                 GOTO(out, err = 0);
1522         }
1523         }
1524         /* Commands that require a device */
1525         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1526         if (!obd) {
1527                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
1528                         CERROR("this lcfg command requires a device name\n");
1529                 else
1530                         CERROR("no device for: %s\n",
1531                                lustre_cfg_string(lcfg, 0));
1532
1533                 GOTO(out, err = -EINVAL);
1534         }
1535         switch(lcfg->lcfg_command) {
1536         case LCFG_SETUP: {
1537                 err = class_setup(obd, lcfg);
1538                 GOTO(out, err);
1539         }
1540         case LCFG_DETACH: {
1541                 err = class_detach(obd, lcfg);
1542                 GOTO(out, err = 0);
1543         }
1544         case LCFG_CLEANUP: {
1545                 err = class_cleanup(obd, lcfg);
1546                 GOTO(out, err = 0);
1547         }
1548         case LCFG_ADD_CONN: {
1549                 err = class_add_conn(obd, lcfg);
1550                 GOTO(out, err = 0);
1551         }
1552         case LCFG_DEL_CONN: {
1553                 err = class_del_conn(obd, lcfg);
1554                 GOTO(out, err = 0);
1555         }
1556         case LCFG_POOL_NEW: {
1557                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
1558                 GOTO(out, err = 0);
1559         }
1560         case LCFG_POOL_ADD: {
1561                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
1562                                    lustre_cfg_string(lcfg, 3));
1563                 GOTO(out, err = 0);
1564         }
1565         case LCFG_POOL_REM: {
1566                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
1567                                    lustre_cfg_string(lcfg, 3));
1568                 GOTO(out, err = 0);
1569         }
1570         case LCFG_POOL_DEL: {
1571                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
1572                 GOTO(out, err = 0);
1573         }
1574         /*
1575          * Process config log ADD_MDC record twice to add MDC also to LOV
1576          * for Data-on-MDT:
1577          *
1578          * add 0:lustre-clilmv 1:lustre-MDT0000_UUID 2:0 3:1
1579          *     4:lustre-MDT0000-mdc_UUID
1580          */
1581         case LCFG_ADD_MDC: {
1582                 struct obd_device *lov_obd;
1583                 char *clilmv;
1584
1585                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1586                 if (err)
1587                         GOTO(out, err);
1588
1589                 /* make sure this is client LMV log entry */
1590                 clilmv = strstr(lustre_cfg_string(lcfg, 0), "clilmv");
1591                 if (!clilmv)
1592                         GOTO(out, err);
1593
1594                 /*
1595                  * replace 'lmv' with 'lov' name to address LOV device and
1596                  * process llog record to add MDC there.
1597                  */
1598                 clilmv[4] = 'o';
1599                 lov_obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1600                 if (lov_obd) {
1601                         err = obd_process_config(lov_obd, sizeof(*lcfg), lcfg);
1602                 } else {
1603                         err = -ENOENT;
1604                         CERROR("%s: Cannot find LOV by %s name, rc = %d\n",
1605                                obd->obd_name, lustre_cfg_string(lcfg, 0), err);
1606                 }
1607                 /* restore 'lmv' name */
1608                 clilmv[4] = 'm';
1609                 GOTO(out, err);
1610         }
1611         default: {
1612                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1613                 GOTO(out, err);
1614         }
1615         }
1616         EXIT;
1617 out:
1618         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
1619                 CWARN("Ignoring error %d on optional command %#x\n", err,
1620                       lcfg->lcfg_command);
1621                 err = 0;
1622         }
1623         return err;
1624 }
1625 EXPORT_SYMBOL(class_process_config);
1626
1627 ssize_t class_modify_config(struct lustre_cfg *lcfg, const char *prefix,
1628                             struct kobject *kobj)
1629 {
1630         const struct kobj_type *typ;
1631         ssize_t count = 0;
1632         int i;
1633
1634         if (lcfg->lcfg_command != LCFG_PARAM) {
1635                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1636                 return -EINVAL;
1637         }
1638
1639         typ = get_ktype(kobj);
1640         if (!typ || !typ->default_groups)
1641                 return -ENODEV;
1642
1643         print_lustre_cfg(lcfg);
1644
1645         /*
1646          * e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1647          * or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1648          * or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36
1649          */
1650         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1651                 struct attribute *attr = NULL;
1652                 size_t keylen;
1653                 char *value;
1654                 char *key;
1655
1656                 key = lustre_cfg_buf(lcfg, i);
1657                 /* Strip off prefix */
1658                 if (class_match_param(key, prefix, &key))
1659                         /*
1660                          * If the prefix doesn't match, return error so we
1661                          * can pass it down the stack
1662                          */
1663                         return -EINVAL;
1664
1665                 value = strchr(key, '=');
1666                 if (!value || *(value + 1) == 0) {
1667                         CERROR("%s: can't parse param '%s' (missing '=')\n",
1668                                lustre_cfg_string(lcfg, 0),
1669                                lustre_cfg_string(lcfg, i));
1670                         /* continue parsing other params */
1671                         continue;
1672                 }
1673                 keylen = value - key;
1674                 value++;
1675
1676                 attr = get_attr_starts_with(typ, key, keylen);
1677                 if (!attr) {
1678                         char *envp[4], *param, *path;
1679
1680                         path = kobject_get_path(kobj, GFP_KERNEL);
1681                         if (!path)
1682                                 return -EINVAL;
1683
1684                         /* convert sysfs path to uevent format */
1685                         param = path;
1686                         while ((param = strchr(param, '/')) != NULL)
1687                                 *param = '.';
1688
1689                         param = strstr(path, "fs.lustre.") + 10;
1690
1691                         envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s.%.*s",
1692                                             param, (int) keylen, key);
1693                         envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1694                         envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1695                                             ktime_get_real_seconds());
1696                         envp[3] = NULL;
1697
1698                         if (kobject_uevent_env(kobj, KOBJ_CHANGE, envp)) {
1699                                 CERROR("%s: failed to send uevent %s\n",
1700                                        kobject_name(kobj), key);
1701                         }
1702
1703                         for (i = 0; i < ARRAY_SIZE(envp); i++)
1704                                 kfree(envp[i]);
1705                         kfree(path);
1706                 } else {
1707                         count += lustre_attr_store(kobj, attr, value,
1708                                                    strlen(value));
1709                 }
1710         }
1711         return count;
1712 }
1713 EXPORT_SYMBOL(class_modify_config);
1714
1715 /*
1716  * Supplemental functions for config logs, it allocates lustre_cfg
1717  * buffers plus initialized llog record header at the beginning.
1718  */
1719 struct llog_cfg_rec *lustre_cfg_rec_new(int cmd, struct lustre_cfg_bufs *bufs)
1720 {
1721         struct llog_cfg_rec *lcr;
1722         int reclen;
1723
1724         ENTRY;
1725
1726         reclen = lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen);
1727         reclen = llog_data_len(reclen) + sizeof(struct llog_rec_hdr) +
1728                  sizeof(struct llog_rec_tail);
1729
1730         OBD_ALLOC(lcr, reclen);
1731         if (!lcr)
1732                 RETURN(NULL);
1733
1734         lustre_cfg_init(&lcr->lcr_cfg, cmd, bufs);
1735
1736         lcr->lcr_hdr.lrh_len = reclen;
1737         lcr->lcr_hdr.lrh_type = OBD_CFG_REC;
1738
1739         RETURN(lcr);
1740 }
1741 EXPORT_SYMBOL(lustre_cfg_rec_new);
1742
1743 void lustre_cfg_rec_free(struct llog_cfg_rec *lcr)
1744 {
1745         ENTRY;
1746         OBD_FREE(lcr, lcr->lcr_hdr.lrh_len);
1747         EXIT;
1748 }
1749 EXPORT_SYMBOL(lustre_cfg_rec_free);
1750
1751 /**
1752  * Parse a configuration llog, doing various manipulations on them
1753  * for various reasons, (modifications for compatibility, skip obsolete
1754  * records, change uuids, etc), then class_process_config() resulting
1755  * net records.
1756  */
1757 int class_config_llog_handler(const struct lu_env *env,
1758                               struct llog_handle *handle,
1759                               struct llog_rec_hdr *rec, void *data)
1760 {
1761         struct config_llog_instance *cfg = data;
1762         int cfg_len = rec->lrh_len;
1763         char *cfg_buf = (char *) (rec + 1);
1764         int rc = 0;
1765         ENTRY;
1766
1767         /* class_config_dump_handler(handle, rec, data); */
1768
1769         switch (rec->lrh_type) {
1770         case OBD_CFG_REC: {
1771                 struct lustre_cfg *lcfg, *lcfg_new;
1772                 struct lustre_cfg_bufs bufs;
1773                 char *inst_name = NULL;
1774                 int inst_len = 0;
1775                 int swab = 0;
1776
1777                 lcfg = (struct lustre_cfg *)cfg_buf;
1778                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1779                         lustre_swab_lustre_cfg(lcfg);
1780                         swab = 1;
1781                 }
1782
1783                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1784                 if (rc)
1785                         GOTO(out, rc);
1786
1787                 /* Figure out config state info */
1788                 if (lcfg->lcfg_command == LCFG_MARKER) {
1789                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1790                         lustre_swab_cfg_marker(marker, swab,
1791                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1792                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1793                                cfg->cfg_flags, marker->cm_flags);
1794                         if (marker->cm_flags & CM_START) {
1795                                 /* all previous flags off */
1796                                 cfg->cfg_flags = CFG_F_MARKER;
1797                                 server_name2index(marker->cm_tgtname,
1798                                                   &cfg->cfg_lwp_idx, NULL);
1799                                 if (marker->cm_flags & CM_SKIP) {
1800                                         cfg->cfg_flags |= CFG_F_SKIP;
1801                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1802                                                marker->cm_step);
1803                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1804                                            (cfg->cfg_sb &&
1805                                            lustre_check_exclusion(cfg->cfg_sb,
1806                                                         marker->cm_tgtname))) {
1807                                         cfg->cfg_flags |= CFG_F_EXCLUDE;
1808                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1809                                                marker->cm_step);
1810                                 }
1811                         } else if (marker->cm_flags & CM_END) {
1812                                 cfg->cfg_flags = 0;
1813                         }
1814                 }
1815                 /*
1816                  * A config command without a start marker before it is
1817                  * illegal
1818                  */
1819                 if (!(cfg->cfg_flags & CFG_F_MARKER) &&
1820                     (lcfg->lcfg_command != LCFG_MARKER)) {
1821                         CWARN("Skip config outside markers, (inst: %016lx, uuid: %s, flags: %#x)\n",
1822                                 cfg->cfg_instance,
1823                                 cfg->cfg_uuid.uuid, cfg->cfg_flags);
1824                         cfg->cfg_flags |= CFG_F_SKIP;
1825                 }
1826                 if (cfg->cfg_flags & CFG_F_SKIP) {
1827                         CDEBUG(D_CONFIG, "skipping %#x\n",
1828                                cfg->cfg_flags);
1829                         rc = 0;
1830                         /* No processing! */
1831                         break;
1832                 }
1833
1834                 /*
1835                  * For interoperability between 1.8 and 2.0,
1836                  * rename "mds" OBD device type to "mdt".
1837                  */
1838                 {
1839                         char *typename = lustre_cfg_string(lcfg, 1);
1840                         char *index = lustre_cfg_string(lcfg, 2);
1841
1842                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1843                             strcmp(typename, "mds") == 0)) {
1844                                 CWARN("For 1.8 interoperability, rename obd "
1845                                         "type from mds to mdt\n");
1846                                 typename[2] = 't';
1847                         }
1848                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1849                             strcmp(index, "type") == 0)) {
1850                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1851                                        "set this index to '0'\n");
1852                                 index[0] = '0';
1853                                 index[1] = 0;
1854                         }
1855                 }
1856
1857 #ifdef HAVE_SERVER_SUPPORT
1858                 /* newer MDS replaces LOV/OSC with LOD/OSP */
1859                 if ((lcfg->lcfg_command == LCFG_ATTACH ||
1860                      lcfg->lcfg_command == LCFG_SET_PARAM ||
1861                      lcfg->lcfg_command == LCFG_PARAM) &&
1862                     cfg->cfg_sb && IS_MDT(s2lsi(cfg->cfg_sb))) {
1863                         char *typename = lustre_cfg_string(lcfg, 1);
1864
1865                         if (typename &&
1866                             strcmp(typename, LUSTRE_LOV_NAME) == 0) {
1867                                 CDEBUG(D_CONFIG,
1868                                        "For 2.x interoperability, rename obd "
1869                                        "type from lov to lod (%s)\n",
1870                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1871                                 strcpy(typename, LUSTRE_LOD_NAME);
1872                         }
1873                         if (typename &&
1874                             strcmp(typename, LUSTRE_OSC_NAME) == 0) {
1875                                 CDEBUG(D_CONFIG,
1876                                        "For 2.x interoperability, rename obd "
1877                                        "type from osc to osp (%s)\n",
1878                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1879                                 strcpy(typename, LUSTRE_OSP_NAME);
1880                         }
1881                 }
1882 #endif /* HAVE_SERVER_SUPPORT */
1883
1884                 if (cfg->cfg_flags & CFG_F_EXCLUDE) {
1885                         CDEBUG(D_CONFIG, "cmd: %x marked EXCLUDED\n",
1886                                lcfg->lcfg_command);
1887                         if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD)
1888                                 /* Add inactive instead */
1889                                 lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1890                 }
1891
1892                 lustre_cfg_bufs_reset(&bufs, NULL);
1893                 lustre_cfg_bufs_init(&bufs, lcfg);
1894
1895                 if (cfg->cfg_instance &&
1896                     lcfg->lcfg_command != LCFG_SPTLRPC_CONF &&
1897                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
1898                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1899                                 LUSTRE_MAXINSTANCE + 4;
1900                         OBD_ALLOC(inst_name, inst_len);
1901                         if (!inst_name)
1902                                 GOTO(out, rc = -ENOMEM);
1903                         snprintf(inst_name, inst_len, "%s-%016lx",
1904                                 lustre_cfg_string(lcfg, 0),
1905                                 cfg->cfg_instance);
1906                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1907                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1908                                lcfg->lcfg_command, inst_name);
1909                 }
1910
1911                 /* override llog UUID for clients, to insure they are unique */
1912                 if (cfg->cfg_instance && lcfg->lcfg_command == LCFG_ATTACH)
1913                         lustre_cfg_bufs_set_string(&bufs, 2,
1914                                                    cfg->cfg_uuid.uuid);
1915                 /*
1916                  * sptlrpc config record, we expect 2 data segments:
1917                  *  [0]: fs_name/target_name,
1918                  *  [1]: rule string
1919                  * moving them to index [1] and [2], and insert MGC's
1920                  * obdname at index [0].
1921                  */
1922                 if (cfg->cfg_instance &&
1923                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1924                         /* After ASLR changes cfg_instance this needs fixing */
1925                         /* "obd" is set in config_log_find_or_add() */
1926                         struct obd_device *obd = (void *)cfg->cfg_instance;
1927
1928                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1929                                             bufs.lcfg_buflen[1]);
1930                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1931                                             bufs.lcfg_buflen[0]);
1932                         lustre_cfg_bufs_set_string(&bufs, 0,
1933                                                    obd->obd_name);
1934                 }
1935
1936                 /*
1937                  * Add net info to setup command
1938                  * if given on command line.
1939                  * So config log will be:
1940                  * [0]: client name
1941                  * [1]: client UUID
1942                  * [2]: server UUID
1943                  * [3]: inactive-on-startup
1944                  * [4]: restrictive net
1945                  */
1946                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1947                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1948                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1949                         char *nidnet = lsi->lsi_lmd->lmd_nidnet;
1950
1951                         if (lcfg->lcfg_command == LCFG_SETUP &&
1952                             lcfg->lcfg_bufcount != 2 && nidnet) {
1953                                 CDEBUG(D_CONFIG, "Adding net %s info to setup "
1954                                        "command for client %s\n", nidnet,
1955                                        lustre_cfg_string(lcfg, 0));
1956                                 lustre_cfg_bufs_set_string(&bufs, 4, nidnet);
1957                         }
1958                 }
1959
1960                 /*
1961                  * Skip add_conn command if uuid is
1962                  * not on restricted net
1963                  */
1964                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1965                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1966                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1967                         char *uuid_str = lustre_cfg_string(lcfg, 1);
1968
1969                         if (lcfg->lcfg_command == LCFG_ADD_CONN &&
1970                             lsi->lsi_lmd->lmd_nidnet &&
1971                             LNET_NIDNET(libcfs_str2nid(uuid_str)) !=
1972                             libcfs_str2net(lsi->lsi_lmd->lmd_nidnet)) {
1973                                 CDEBUG(D_CONFIG, "skipping add_conn for %s\n",
1974                                        uuid_str);
1975                                 /* No processing! */
1976                                 GOTO(out_inst, rc = 0);
1977                         }
1978                 }
1979
1980                 OBD_ALLOC(lcfg_new, lustre_cfg_len(bufs.lcfg_bufcount,
1981                                                    bufs.lcfg_buflen));
1982                 if (!lcfg_new)
1983                         GOTO(out_inst, rc = -ENOMEM);
1984
1985                 lustre_cfg_init(lcfg_new, lcfg->lcfg_command, &bufs);
1986                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1987                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1988
1989                 /*
1990                  * XXX Hack to try to remain binary compatible with
1991                  * pre-newconfig logs
1992                  */
1993                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1994                     (lcfg->lcfg_nid >> 32) == 0) {
1995                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1996
1997                         lcfg_new->lcfg_nid =
1998                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1999                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
2000                               lcfg->lcfg_nal, addr,
2001                               libcfs_nid2str(lcfg_new->lcfg_nid));
2002                 } else {
2003                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
2004                 }
2005
2006                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
2007
2008                 rc = class_process_config(lcfg_new);
2009                 OBD_FREE(lcfg_new, lustre_cfg_len(lcfg_new->lcfg_bufcount,
2010                                                   lcfg_new->lcfg_buflens));
2011 out_inst:
2012                 if (inst_name)
2013                         OBD_FREE(inst_name, inst_len);
2014                 break;
2015         }
2016         default:
2017                 CERROR("Unknown llog record type %#x encountered\n",
2018                        rec->lrh_type);
2019                 break;
2020         }
2021 out:
2022         if (rc) {
2023                 CERROR("%s: cfg command failed: rc = %d\n",
2024                         handle->lgh_ctxt->loc_obd->obd_name, rc);
2025                 class_config_dump_handler(NULL, handle, rec, data);
2026         }
2027         RETURN(rc);
2028 }
2029 EXPORT_SYMBOL(class_config_llog_handler);
2030
2031 int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
2032                             char *name, struct config_llog_instance *cfg)
2033 {
2034         struct llog_process_cat_data cd = {
2035                 .lpcd_first_idx = 0,
2036                 .lpcd_read_mode = LLOG_READ_MODE_NORMAL,
2037         };
2038         struct llog_handle *llh;
2039         llog_cb_t callback;
2040         int rc;
2041         ENTRY;
2042
2043         CDEBUG(D_INFO, "looking up llog %s\n", name);
2044         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
2045         if (rc)
2046                 RETURN(rc);
2047
2048         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
2049         if (rc)
2050                 GOTO(parse_out, rc);
2051
2052         /* continue processing from where we last stopped to end-of-log */
2053         if (cfg) {
2054                 cd.lpcd_first_idx = cfg->cfg_last_idx;
2055                 callback = cfg->cfg_callback;
2056                 LASSERT(callback != NULL);
2057         } else {
2058                 callback = class_config_llog_handler;
2059         }
2060
2061         cd.lpcd_last_idx = 0;
2062
2063         rc = llog_process(env, llh, callback, cfg, &cd);
2064
2065         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
2066                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
2067         if (cfg)
2068                 cfg->cfg_last_idx = cd.lpcd_last_idx;
2069
2070 parse_out:
2071         llog_close(env, llh);
2072         RETURN(rc);
2073 }
2074 EXPORT_SYMBOL(class_config_parse_llog);
2075
2076 /**
2077  * Get marker cfg_flag
2078  */
2079 void llog_get_marker_cfg_flags(struct llog_rec_hdr *rec,
2080                                unsigned int *cfg_flags)
2081 {
2082         struct lustre_cfg *lcfg = (struct lustre_cfg *)(rec + 1);
2083         struct cfg_marker *marker;
2084
2085         if (lcfg->lcfg_command == LCFG_MARKER) {
2086                 marker = lustre_cfg_buf(lcfg, 1);
2087                 if (marker->cm_flags & CM_START) {
2088                         *cfg_flags = CFG_F_MARKER;
2089                         if (marker->cm_flags & CM_SKIP)
2090                                 *cfg_flags = CFG_F_SKIP;
2091                 } else if (marker->cm_flags & CM_END) {
2092                         *cfg_flags = 0;
2093                 }
2094                 CDEBUG(D_INFO, "index=%d, cm_flags=%#08x cfg_flags=%#08x\n",
2095                        rec->lrh_index, marker->cm_flags, *cfg_flags);
2096         }
2097 }
2098
2099 /**
2100  * Parse config record and output dump in supplied buffer.
2101  *
2102  * This is separated from class_config_dump_handler() to use
2103  * for ioctl needs as well
2104  *
2105  * Sample Output:
2106  * - { index: 4, event: attach, device: lustrewt-clilov, type: lov,
2107  *     UUID: lustrewt-clilov_UUID }
2108  */
2109 int class_config_yaml_output(struct llog_rec_hdr *rec, char *buf, int size,
2110                              unsigned int *cfg_flags, bool raw)
2111 {
2112         struct lustre_cfg *lcfg = (struct lustre_cfg *)(rec + 1);
2113         char *ptr = buf;
2114         char *end = buf + size;
2115         int rc = 0, i;
2116         struct lcfg_type_data *ldata;
2117         int swab = 0;
2118
2119         LASSERT(rec->lrh_type == OBD_CFG_REC);
2120
2121         if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
2122                 lustre_swab_lustre_cfg(lcfg);
2123                 swab = 1;
2124         }
2125
2126         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2127         if (rc < 0)
2128                 return rc;
2129
2130         ldata = lcfg_cmd2data(lcfg->lcfg_command);
2131         if (!ldata)
2132                 return -ENOTTY;
2133
2134         llog_get_marker_cfg_flags(rec, cfg_flags);
2135         if ((lcfg->lcfg_command == LCFG_MARKER) && likely(!raw))
2136                 return 0;
2137         /* entries outside marker are skipped */
2138         if (!(*cfg_flags & CFG_F_MARKER) && !raw)
2139                 return 0;
2140         /* inside skipped marker */
2141         if ((*cfg_flags & CFG_F_SKIP) && !raw)
2142                 return 0;
2143
2144         /* form YAML entity */
2145         ptr += snprintf(ptr, end - ptr, "- { index: %u, event: %s",
2146                         rec->lrh_index, ldata->ltd_name);
2147         if (end - ptr <= 0)
2148                 goto out_overflow;
2149
2150         if (lcfg->lcfg_flags) {
2151                 ptr += snprintf(ptr, end - ptr, ", flags: %#08x",
2152                                 lcfg->lcfg_flags);
2153                 if (end - ptr <= 0)
2154                         goto out_overflow;
2155         }
2156         if (lcfg->lcfg_num) {
2157                 ptr += snprintf(ptr, end - ptr, ", num: %#08x",
2158                                 lcfg->lcfg_num);
2159                 if (end - ptr <= 0)
2160                         goto out_overflow;
2161         }
2162         if (lcfg->lcfg_nid) {
2163                 char nidstr[LNET_NIDSTR_SIZE];
2164
2165                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2166                 ptr += snprintf(ptr, end - ptr, ", nid: %s(%#llx)",
2167                                 nidstr, lcfg->lcfg_nid);
2168                 if (end - ptr <= 0)
2169                         goto out_overflow;
2170         }
2171
2172         if (LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
2173                 ptr += snprintf(ptr, end - ptr, ", device: %s",
2174                                 lustre_cfg_string(lcfg, 0));
2175                 if (end - ptr <= 0)
2176                         goto out_overflow;
2177         }
2178
2179         if (lcfg->lcfg_command == LCFG_SET_PARAM) {
2180                 /*
2181                  * set_param -P parameters have param=val here, separate
2182                  * them through pointer magic and print them out in
2183                  * native yamlese
2184                  */
2185                 char *cfg_str = lustre_cfg_string(lcfg, 1);
2186                 char *tmp = strchr(cfg_str, '=');
2187                 size_t len;
2188
2189                 if (!tmp)
2190                         goto out_done;
2191
2192                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[0]);
2193                 len = tmp - cfg_str + 1;
2194                 snprintf(ptr, len, "%s", cfg_str);
2195                 ptr += len - 1;
2196
2197                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[1]);
2198                 ptr += snprintf(ptr, end - ptr, "%s", tmp + 1);
2199
2200                 goto out_done;
2201         }
2202
2203         if (lcfg->lcfg_command == LCFG_MARKER) {
2204                 struct cfg_marker *marker;
2205
2206                 marker = lustre_cfg_buf(lcfg, 1);
2207                 ptr += snprintf(ptr, end - ptr, ", flags: %#04x",
2208                                 marker->cm_flags);
2209                 ptr += snprintf(ptr, end - ptr, ", version: %d.%d.%d.%d",
2210                                 OBD_OCD_VERSION_MAJOR(marker->cm_vers),
2211                                 OBD_OCD_VERSION_MINOR(marker->cm_vers),
2212                                 OBD_OCD_VERSION_PATCH(marker->cm_vers),
2213                                 OBD_OCD_VERSION_FIX(marker->cm_vers));
2214                 ptr += snprintf(ptr, end - ptr, ", createtime: %lld",
2215                                 marker->cm_createtime);
2216                 ptr += snprintf(ptr, end - ptr, ", canceltime: %lld",
2217                                 marker->cm_canceltime);
2218
2219                 goto out_done;
2220         }
2221
2222         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
2223                 if (LUSTRE_CFG_BUFLEN(lcfg, i) > 0) {
2224                         ptr += snprintf(ptr, end - ptr, ", %s: %s",
2225                                         ldata->ltd_bufs[i - 1],
2226                                         lustre_cfg_string(lcfg, i));
2227                         if (end - ptr <= 0)
2228                                 goto out_overflow;
2229                 }
2230         }
2231
2232 out_done:
2233         ptr += snprintf(ptr, end - ptr, " }\n");
2234 out_overflow:
2235         /* Return consumed bytes.  If the buffer overflowed, zero last byte */
2236         rc = ptr - buf;
2237         if (rc > size) {
2238                 rc = -EOVERFLOW;
2239                 *(end - 1) = '\0';
2240         }
2241
2242         return rc;
2243 }
2244
2245 /**
2246  * parse config record and output dump in supplied buffer.
2247  * This is separated from class_config_dump_handler() to use
2248  * for ioctl needs as well
2249  */
2250 static int class_config_parse_rec(struct llog_rec_hdr *rec, char *buf, int size)
2251 {
2252         struct lustre_cfg       *lcfg = (struct lustre_cfg *)(rec + 1);
2253         char                    *ptr = buf;
2254         char                    *end = buf + size;
2255         int                      rc = 0;
2256
2257         ENTRY;
2258
2259         LASSERT(rec->lrh_type == OBD_CFG_REC);
2260         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2261         if (rc < 0)
2262                 RETURN(rc);
2263
2264         ptr += snprintf(ptr, end-ptr, "cmd=%05x ", lcfg->lcfg_command);
2265         if (lcfg->lcfg_flags)
2266                 ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
2267                                 lcfg->lcfg_flags);
2268
2269         if (lcfg->lcfg_num)
2270                 ptr += snprintf(ptr, end-ptr, "num=%#08x ", lcfg->lcfg_num);
2271
2272         if (lcfg->lcfg_nid) {
2273                 char nidstr[LNET_NIDSTR_SIZE];
2274
2275                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2276                 ptr += snprintf(ptr, end-ptr, "nid=%s(%#llx)    ",
2277                                 nidstr, lcfg->lcfg_nid);
2278         }
2279
2280         if (lcfg->lcfg_command == LCFG_MARKER) {
2281                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
2282
2283                 ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
2284                                 marker->cm_step, marker->cm_flags,
2285                                 marker->cm_tgtname, marker->cm_comment);
2286         } else {
2287                 int i;
2288
2289                 for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
2290                         ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
2291                                         lustre_cfg_string(lcfg, i));
2292                 }
2293         }
2294         ptr += snprintf(ptr, end - ptr, "\n");
2295         /* return consumed bytes */
2296         rc = ptr - buf;
2297         RETURN(rc);
2298 }
2299
2300 int class_config_dump_handler(const struct lu_env *env,
2301                               struct llog_handle *handle,
2302                               struct llog_rec_hdr *rec, void *data)
2303 {
2304         char *outstr;
2305         int rc = 0;
2306
2307         ENTRY;
2308
2309         OBD_ALLOC(outstr, 256);
2310         if (!outstr)
2311                 RETURN(-ENOMEM);
2312
2313         if (rec->lrh_type == OBD_CFG_REC) {
2314                 class_config_parse_rec(rec, outstr, 256);
2315                 LCONSOLE(D_WARNING, "   %s\n", outstr);
2316         } else {
2317                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
2318                 rc = -EINVAL;
2319         }
2320
2321         OBD_FREE(outstr, 256);
2322         RETURN(rc);
2323 }
2324
2325 /**
2326  * Call class_cleanup and class_detach.
2327  * "Manual" only in the sense that we're faking lcfg commands.
2328  */
2329 int class_manual_cleanup(struct obd_device *obd)
2330 {
2331         char flags[3] = "";
2332         struct lustre_cfg *lcfg;
2333         struct lustre_cfg_bufs bufs;
2334         int rc;
2335
2336         ENTRY;
2337
2338         if (!obd) {
2339                 CERROR("empty cleanup\n");
2340                 RETURN(-EALREADY);
2341         }
2342
2343         if (obd->obd_force)
2344                 strlcat(flags, "F", sizeof(flags));
2345         if (obd->obd_fail)
2346                 strlcat(flags, "A", sizeof(flags));
2347
2348         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
2349                obd->obd_name, flags);
2350
2351         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
2352         lustre_cfg_bufs_set_string(&bufs, 1, flags);
2353         OBD_ALLOC(lcfg, lustre_cfg_len(bufs.lcfg_bufcount, bufs.lcfg_buflen));
2354         if (!lcfg)
2355                 RETURN(-ENOMEM);
2356         lustre_cfg_init(lcfg, LCFG_CLEANUP, &bufs);
2357
2358         rc = class_process_config(lcfg);
2359         if (rc) {
2360                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
2361                 GOTO(out, rc);
2362         }
2363
2364         /* the lcfg is almost the same for both ops */
2365         lcfg->lcfg_command = LCFG_DETACH;
2366         rc = class_process_config(lcfg);
2367         if (rc)
2368                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
2369 out:
2370         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
2371         RETURN(rc);
2372 }
2373 EXPORT_SYMBOL(class_manual_cleanup);
2374
2375 #ifdef HAVE_SERVER_SUPPORT
2376 /*
2377  * nid<->nidstats hash operations
2378  */
2379 static unsigned
2380 nidstats_hash(struct cfs_hash *hs, const void *key, unsigned int mask)
2381 {
2382         return cfs_hash_djb2_hash(key, sizeof(struct lnet_nid), mask);
2383 }
2384
2385 static void *
2386 nidstats_key(struct hlist_node *hnode)
2387 {
2388         struct nid_stat *ns;
2389
2390         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2391
2392         return &ns->nid;
2393 }
2394
2395 static int
2396 nidstats_keycmp(const void *key, struct hlist_node *hnode)
2397 {
2398         return nid_same((struct lnet_nid *)nidstats_key(hnode),
2399                          (struct lnet_nid *)key);
2400 }
2401
2402 static void *
2403 nidstats_object(struct hlist_node *hnode)
2404 {
2405         return hlist_entry(hnode, struct nid_stat, nid_hash);
2406 }
2407
2408 static void
2409 nidstats_get(struct cfs_hash *hs, struct hlist_node *hnode)
2410 {
2411         struct nid_stat *ns;
2412
2413         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2414         nidstat_getref(ns);
2415 }
2416
2417 static void
2418 nidstats_put_locked(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_putref(ns);
2424 }
2425
2426 static struct cfs_hash_ops nid_stat_hash_ops = {
2427         .hs_hash        = nidstats_hash,
2428         .hs_key         = nidstats_key,
2429         .hs_keycmp      = nidstats_keycmp,
2430         .hs_object      = nidstats_object,
2431         .hs_get         = nidstats_get,
2432         .hs_put_locked  = nidstats_put_locked,
2433 };
2434
2435 /*
2436  * client_generation<->export hash operations
2437  */
2438
2439 static unsigned
2440 gen_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2441 {
2442         return cfs_hash_djb2_hash(key, sizeof(__u32), mask);
2443 }
2444
2445 static void *
2446 gen_key(struct hlist_node *hnode)
2447 {
2448         struct obd_export *exp;
2449
2450         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2451
2452         RETURN(&exp->exp_target_data.ted_lcd->lcd_generation);
2453 }
2454
2455 /*
2456  * NOTE: It is impossible to find an export that is in failed
2457  *       state with this function
2458  */
2459 static int
2460 gen_kepcmp(const void *key, struct hlist_node *hnode)
2461 {
2462         struct obd_export *exp;
2463
2464         LASSERT(key);
2465         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2466
2467         RETURN(exp->exp_target_data.ted_lcd->lcd_generation == *(__u32 *)key &&
2468                !exp->exp_failed);
2469 }
2470
2471 static void *
2472 gen_export_object(struct hlist_node *hnode)
2473 {
2474         return hlist_entry(hnode, struct obd_export, exp_gen_hash);
2475 }
2476
2477 static void
2478 gen_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
2479 {
2480         struct obd_export *exp;
2481
2482         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2483         class_export_get(exp);
2484 }
2485
2486 static void
2487 gen_export_put_locked(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_put(exp);
2493 }
2494
2495 static struct cfs_hash_ops gen_hash_ops = {
2496         .hs_hash        = gen_hash,
2497         .hs_key         = gen_key,
2498         .hs_keycmp      = gen_kepcmp,
2499         .hs_object      = gen_export_object,
2500         .hs_get         = gen_export_get,
2501         .hs_put_locked  = gen_export_put_locked,
2502 };
2503
2504 #endif /* HAVE_SERVER_SUPPORT */