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 lnet_nid_t *nid = arg->key;
 173         const struct obd_export *exp = obj;
 174
 175         if (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(lnet_nid_t),
 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, lnet_nid_t 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
 524 int class_match_net(char *buf, char *key, __u32 net)
 525 {
 526         __u32 tmp;
 527         int rc = -1;
 528
 529         while (class_find_param(buf, key, &buf) == 0) {
 530                 /*
 531                  * please restrict to the NIDs pertaining to
 532                  * the specified networks
 533                  */
 534                 while (class_parse_net(buf, &tmp, &buf) == 0) {
 535                         if (tmp == net)
 536                                 return 1;
 537                 }
 538                 rc = 0;
 539         }
 540         return rc;
 541 }
 542
 543 char *lustre_cfg_string(struct lustre_cfg *lcfg, u32 index)
 544 {
 545         char *s;
 546
 547         if (!lcfg->lcfg_buflens[index])
 548                 return NULL;
 549
 550         s = lustre_cfg_buf(lcfg, index);
 551         if (!s)
 552                 return NULL;
 553
 554         /*
 555          * make sure it's NULL terminated, even if this kills a char
 556          * of data.  Try to use the padding first though.
 557          */
 558         if (s[lcfg->lcfg_buflens[index] - 1] != '\0') {
 559                 size_t last = ALIGN(lcfg->lcfg_buflens[index], 8) - 1;
 560                 char lost;
 561
 562                 /* Use the smaller value */
 563                 if (last > lcfg->lcfg_buflens[index])
 564                         last = lcfg->lcfg_buflens[index];
 565
 566                 lost = s[last];
 567                 s[last] = '\0';
 568                 if (lost != '\0') {
 569                         CWARN("Truncated buf %d to '%s' (lost '%c'...)\n",
 570                               index, s, lost);
 571                 }
 572         }
 573         return s;
 574 }
 575 EXPORT_SYMBOL(lustre_cfg_string);
 576
 577 /********************** class fns **********************/
 578
 579 /**
 580  * Create a new OBD device and set the type, name and uuid.  If successful,
 581  * the new device can be accessed by either name or uuid.
 582  */
 583 int class_attach(struct lustre_cfg *lcfg)
 584 {
 585         struct obd_export *exp;
 586         struct obd_device *obd = NULL;
 587         char *typename, *name, *uuid;
 588         int rc, len;
 589
 590         ENTRY;
 591
 592         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 593                 CERROR("No type passed!\n");
 594                 RETURN(-EINVAL);
 595         }
 596         typename = lustre_cfg_string(lcfg, 1);
 597
 598         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 599                 CERROR("No name passed!\n");
 600                 RETURN(-EINVAL);
 601         }
 602         name = lustre_cfg_string(lcfg, 0);
 603         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 604                 CERROR("No UUID passed!\n");
 605                 RETURN(-EINVAL);
 606         }
 607
 608         uuid = lustre_cfg_string(lcfg, 2);
 609         len = strlen(uuid);
 610         if (len >= sizeof(obd->obd_uuid)) {
 611                 CERROR("%s: uuid must be < %d bytes long\n",
 612                        name, (int)sizeof(obd->obd_uuid));
 613                 RETURN(-EINVAL);
 614         }
 615
 616         obd = class_newdev(typename, name, uuid);
 617         if (IS_ERR(obd)) { /* Already exists or out of obds */
 618                 rc = PTR_ERR(obd);
 619                 CERROR("Cannot create device %s of type %s : %d\n",
 620                        name, typename, rc);
 621                 RETURN(rc);
 622         }
 623         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 624                  "obd %p obd_magic %08X != %08X\n",
 625                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 626         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 627                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 628
 629         exp = class_new_export_self(obd, &obd->obd_uuid);
 630         if (IS_ERR(exp)) {
 631                 rc = PTR_ERR(exp);
 632                 class_free_dev(obd);
 633                 RETURN(rc);
 634         }
 635
 636         obd->obd_self_export = exp;
 637         list_del_init(&exp->exp_obd_chain_timed);
 638         class_export_put(exp);
 639
 640         rc = class_register_device(obd);
 641         if (rc != 0) {
 642                 class_decref(obd, "newdev", obd);
 643                 RETURN(rc);
 644         }
 645
 646         obd->obd_attached = 1;
 647         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 648                obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
 649
 650         RETURN(0);
 651 }
 652 EXPORT_SYMBOL(class_attach);
 653
 654 /**
 655  * Create hashes, self-export, and call type-specific setup.
 656  * Setup is effectively the "start this obd" call.
 657  */
 658 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 659 {
 660         int err = 0;
 661
 662         ENTRY;
 663
 664         LASSERT(obd != NULL);
 665         LASSERTF(obd == class_num2obd(obd->obd_minor),
 666                  "obd %p != obd_devs[%d] %p\n",
 667                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 668         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 669                  "obd %p obd_magic %08x != %08x\n",
 670                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 671
 672         /* have we attached a type to this device? */
 673         if (!obd->obd_attached) {
 674                 CERROR("Device %d not attached\n", obd->obd_minor);
 675                 RETURN(-ENODEV);
 676         }
 677
 678         if (obd->obd_set_up) {
 679                 CERROR("Device %d already setup (type %s)\n",
 680                        obd->obd_minor, obd->obd_type->typ_name);
 681                 RETURN(-EEXIST);
 682         }
 683
 684         /* is someone else setting us up right now? (attach inits spinlock) */
 685         spin_lock(&obd->obd_dev_lock);
 686         if (obd->obd_starting) {
 687                 spin_unlock(&obd->obd_dev_lock);
 688                 CERROR("Device %d setup in progress (type %s)\n",
 689                        obd->obd_minor, obd->obd_type->typ_name);
 690                 RETURN(-EEXIST);
 691         }
 692         /*
 693          * just leave this on forever.  I can't use obd_set_up here because
 694          * other fns check that status, and we're not actually set up yet.
 695          */
 696         obd->obd_starting = 1;
 697         obd->obd_nid_stats_hash = NULL;
 698         obd->obd_gen_hash = NULL;
 699         spin_unlock(&obd->obd_dev_lock);
 700
 701         /* create an uuid-export lustre hash */
 702         err = rhashtable_init(&obd->obd_uuid_hash, &uuid_hash_params);
 703         if (err)
 704                 GOTO(err_starting, err);
 705
 706 #ifdef HAVE_SERVER_SUPPORT
 707         /* create a nid-export lustre hash */
 708         err = rhltable_init(&obd->obd_nid_hash, &nid_hash_params);
 709         if (err)
 710                 GOTO(err_uuid_hash, err = -ENOMEM);
 711
 712         /* create a nid-stats lustre hash */
 713         obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
 714                                                   HASH_NID_STATS_CUR_BITS,
 715                                                   HASH_NID_STATS_MAX_BITS,
 716                                                   HASH_NID_STATS_BKT_BITS, 0,
 717                                                   CFS_HASH_MIN_THETA,
 718                                                   CFS_HASH_MAX_THETA,
 719                                                   &nid_stat_hash_ops,
 720                                                   CFS_HASH_DEFAULT);
 721         if (!obd->obd_nid_stats_hash)
 722                 GOTO(err_nid_hash, err = -ENOMEM);
 723
 724         /* create a client_generation-export lustre hash */
 725         obd->obd_gen_hash = cfs_hash_create("UUID_HASH",
 726                                             HASH_GEN_CUR_BITS,
 727                                             HASH_GEN_MAX_BITS,
 728                                             HASH_GEN_BKT_BITS, 0,
 729                                             CFS_HASH_MIN_THETA,
 730                                             CFS_HASH_MAX_THETA,
 731                                             &gen_hash_ops, CFS_HASH_DEFAULT);
 732         if (!obd->obd_gen_hash)
 733                 GOTO(err_nid_stats_hash, err = -ENOMEM);
 734 #endif /* HAVE_SERVER_SUPPORT */
 735
 736         err = obd_setup(obd, lcfg);
 737         if (err)
 738 #ifdef HAVE_SERVER_SUPPORT
 739                 GOTO(err_gen_hash, err);
 740 #else
 741                 GOTO(err_uuid_hash, err);
 742 #endif /* ! HAVE_SERVER_SUPPORT */
 743
 744         obd->obd_set_up = 1;
 745
 746         spin_lock(&obd->obd_dev_lock);
 747         /* cleanup drops this */
 748         class_incref(obd, "setup", obd);
 749         spin_unlock(&obd->obd_dev_lock);
 750
 751         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 752                obd->obd_name, obd->obd_uuid.uuid);
 753
 754         RETURN(0);
 755
 756 #ifdef HAVE_SERVER_SUPPORT
 757 err_gen_hash:
 758         if (obd->obd_gen_hash) {
 759                 cfs_hash_putref(obd->obd_gen_hash);
 760                 obd->obd_gen_hash = NULL;
 761         }
 762 err_nid_stats_hash:
 763         if (obd->obd_nid_stats_hash) {
 764                 cfs_hash_putref(obd->obd_nid_stats_hash);
 765                 obd->obd_nid_stats_hash = NULL;
 766         }
 767 err_nid_hash:
 768         rhltable_destroy(&obd->obd_nid_hash);
 769 #endif /* HAVE_SERVER_SUPPORT */
 770 err_uuid_hash:
 771         rhashtable_destroy(&obd->obd_uuid_hash);
 772 err_starting:
 773         obd->obd_starting = 0;
 774         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 775         return err;
 776 }
 777 EXPORT_SYMBOL(class_setup);
 778
 779 /**
 780  * We have finished using this OBD and are ready to destroy it.
 781  * There can be no more references to this obd.
 782  */
 783 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 784 {
 785         ENTRY;
 786
 787         if (obd->obd_set_up) {
 788                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 789                 RETURN(-EBUSY);
 790         }
 791
 792         spin_lock(&obd->obd_dev_lock);
 793         if (!obd->obd_attached) {
 794                 spin_unlock(&obd->obd_dev_lock);
 795                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 796                 RETURN(-ENODEV);
 797         }
 798         obd->obd_attached = 0;
 799         spin_unlock(&obd->obd_dev_lock);
 800
 801         /* cleanup in progress. we don't like to find this device after now */
 802         class_unregister_device(obd);
 803
 804         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 805                obd->obd_name, obd->obd_uuid.uuid);
 806
 807         class_decref(obd, "newdev", obd);
 808
 809         RETURN(0);
 810 }
 811 EXPORT_SYMBOL(class_detach);
 812
 813 /**
 814  * Start shutting down the OBD.  There may be in-progess ops when
 815  * this is called.  We tell them to start shutting down with a call
 816  * to class_disconnect_exports().
 817  */
 818 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 819 {
 820         int err = 0;
 821         char *flag;
 822         ENTRY;
 823
 824         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 825
 826         if (!obd->obd_set_up) {
 827                 CERROR("Device %d not setup\n", obd->obd_minor);
 828                 RETURN(-ENODEV);
 829         }
 830
 831         spin_lock(&obd->obd_dev_lock);
 832         if (obd->obd_stopping) {
 833                 spin_unlock(&obd->obd_dev_lock);
 834                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 835                 RETURN(-ENODEV);
 836         }
 837         /* Leave this on forever */
 838         obd->obd_stopping = 1;
 839         spin_unlock(&obd->obd_dev_lock);
 840
 841         /* wait for already-arrived-connections to finish. */
 842         while (obd->obd_conn_inprogress > 0)
 843                 yield();
 844         smp_rmb();
 845
 846         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 847                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 848                         switch (*flag) {
 849                         case 'F':
 850                                 obd->obd_force = 1;
 851                                 break;
 852                         case 'A':
 853                                 LCONSOLE_WARN("Failing over %s\n",
 854                                               obd->obd_name);
 855                                 spin_lock(&obd->obd_dev_lock);
 856                                 obd->obd_fail = 1;
 857 #ifdef HAVE_SERVER_SUPPORT
 858                                 obd->obd_no_transno = 1;
 859 #endif
 860                                 obd->obd_no_recov = 1;
 861                                 spin_unlock(&obd->obd_dev_lock);
 862                                 if (OBP(obd, iocontrol)) {
 863                                         obd_iocontrol(OBD_IOC_SYNC,
 864                                                       obd->obd_self_export,
 865                                                       0, NULL, NULL);
 866                                 }
 867                                 break;
 868                         default:
 869                                 CERROR("Unrecognised flag '%c'\n", *flag);
 870                         }
 871         }
 872
 873         LASSERT(obd->obd_self_export);
 874
 875         CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d/%d\n",
 876                obd->obd_name, obd->obd_num_exports,
 877                atomic_read(&obd->obd_refcount) - 2);
 878         dump_exports(obd, 0, D_HA);
 879         class_disconnect_exports(obd);
 880
 881         /* Precleanup, we must make sure all exports get destroyed. */
 882         err = obd_precleanup(obd);
 883         if (err)
 884                 CERROR("Precleanup %s returned %d\n",
 885                        obd->obd_name, err);
 886
 887         /* destroy an uuid-export hash body */
 888         rhashtable_free_and_destroy(&obd->obd_uuid_hash, obd_export_exit,
 889                                     NULL);
 890 #ifdef HAVE_SERVER_SUPPORT
 891         /* destroy a nid-export hash body */
 892         rhltable_free_and_destroy(&obd->obd_nid_hash, nid_export_exit, NULL);
 893
 894         /* destroy a nid-stats hash body */
 895         if (obd->obd_nid_stats_hash) {
 896                 cfs_hash_putref(obd->obd_nid_stats_hash);
 897                 obd->obd_nid_stats_hash = NULL;
 898         }
 899
 900         /* destroy a client_generation-export hash body */
 901         if (obd->obd_gen_hash) {
 902                 cfs_hash_putref(obd->obd_gen_hash);
 903                 obd->obd_gen_hash = NULL;
 904         }
 905 #endif /* HAVE_SERVER_SUPPORT */
 906         class_decref(obd, "setup", obd);
 907         obd->obd_set_up = 0;
 908
 909         RETURN(0);
 910 }
 911
 912 struct obd_device *class_incref(struct obd_device *obd,
 913                                 const char *scope,
 914                                 const void *source)
 915 {
 916         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 917         atomic_inc(&obd->obd_refcount);
 918         CDEBUG(D_INFO, "incref %s (%p) now %d\n", obd->obd_name, obd,
 919                atomic_read(&obd->obd_refcount));
 920
 921         return obd;
 922 }
 923 EXPORT_SYMBOL(class_incref);
 924
 925 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 926 {
 927         int last;
 928
 929         CDEBUG(D_INFO, "Decref %s (%p) now %d - %s\n", obd->obd_name, obd,
 930                atomic_read(&obd->obd_refcount), scope);
 931
 932         LASSERT(obd->obd_num_exports >= 0);
 933         last = atomic_dec_and_test(&obd->obd_refcount);
 934         lu_ref_del(&obd->obd_reference, scope, source);
 935
 936         if (last) {
 937                 struct obd_export *exp;
 938
 939                 LASSERT(!obd->obd_attached);
 940                 /*
 941                  * All exports have been destroyed; there should
 942                  * be no more in-progress ops by this point.
 943                  */
 944                 exp = obd->obd_self_export;
 945
 946                 if (exp) {
 947                         exp->exp_flags |= exp_flags_from_obd(obd);
 948                         class_unlink_export(exp);
 949                 }
 950         }
 951 }
 952 EXPORT_SYMBOL(class_decref);
 953
 954 /**
 955  * Add a failover NID location.
 956  * Client OBD types contact server OBD types using this NID list.
 957  */
 958 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 959 {
 960         struct obd_import *imp;
 961         struct obd_uuid uuid;
 962         int rc;
 963
 964         ENTRY;
 965
 966         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 967             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 968                 CERROR("invalid conn_uuid\n");
 969                 RETURN(-EINVAL);
 970         }
 971         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 972             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
 973             strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) &&
 974             strcmp(obd->obd_type->typ_name, LUSTRE_LWP_NAME) &&
 975             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
 976                 CERROR("can't add connection on non-client dev\n");
 977                 RETURN(-EINVAL);
 978         }
 979
 980         imp = obd->u.cli.cl_import;
 981         if (!imp) {
 982                 CERROR("try to add conn on immature client dev\n");
 983                 RETURN(-EINVAL);
 984         }
 985
 986         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 987         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
 988
 989         RETURN(rc);
 990 }
 991
 992 /** Remove a failover NID location. */
 993 static int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 994 {
 995         struct obd_import *imp;
 996         struct obd_uuid uuid;
 997         int rc;
 998
 999         ENTRY;
1000
1001         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
1002             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
1003                 CERROR("invalid conn_uuid\n");
1004                 RETURN(-EINVAL);
1005         }
1006         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
1007             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
1008                 CERROR("can't del connection on non-client dev\n");
1009                 RETURN(-EINVAL);
1010         }
1011
1012         imp = obd->u.cli.cl_import;
1013         if (!imp) {
1014                 CERROR("try to del conn on immature client dev\n");
1015                 RETURN(-EINVAL);
1016         }
1017
1018         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
1019         rc = obd_del_conn(imp, &uuid);
1020
1021         RETURN(rc);
1022 }
1023
1024 static LIST_HEAD(lustre_profile_list);
1025 static DEFINE_SPINLOCK(lustre_profile_list_lock);
1026
1027 struct lustre_profile *class_get_profile(const char *prof)
1028 {
1029         struct lustre_profile *lprof;
1030
1031         ENTRY;
1032         spin_lock(&lustre_profile_list_lock);
1033         list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
1034                 if (!strcmp(lprof->lp_profile, prof)) {
1035                         lprof->lp_refs++;
1036                         spin_unlock(&lustre_profile_list_lock);
1037                         RETURN(lprof);
1038                 }
1039         }
1040         spin_unlock(&lustre_profile_list_lock);
1041         RETURN(NULL);
1042 }
1043 EXPORT_SYMBOL(class_get_profile);
1044
1045 /**
1046  * Create a named "profile".
1047  * This defines the MDC and OSC names to use for a client.
1048  * This also is used to define the LOV to be used by a MDT.
1049  */
1050 static int class_add_profile(int proflen, char *prof, int osclen, char *osc,
1051                              int mdclen, char *mdc)
1052 {
1053         struct lustre_profile *lprof;
1054         int err = 0;
1055
1056         ENTRY;
1057
1058         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
1059
1060         OBD_ALLOC(lprof, sizeof(*lprof));
1061         if (!lprof)
1062                 RETURN(-ENOMEM);
1063         INIT_LIST_HEAD(&lprof->lp_list);
1064
1065         LASSERT(proflen == (strlen(prof) + 1));
1066         OBD_ALLOC(lprof->lp_profile, proflen);
1067         if (!lprof->lp_profile)
1068                 GOTO(out, err = -ENOMEM);
1069         memcpy(lprof->lp_profile, prof, proflen);
1070
1071         LASSERT(osclen == (strlen(osc) + 1));
1072         OBD_ALLOC(lprof->lp_dt, osclen);
1073         if (!lprof->lp_dt)
1074                 GOTO(out, err = -ENOMEM);
1075         memcpy(lprof->lp_dt, osc, osclen);
1076
1077         if (mdclen > 0) {
1078                 LASSERT(mdclen == (strlen(mdc) + 1));
1079                 OBD_ALLOC(lprof->lp_md, mdclen);
1080                 if (!lprof->lp_md)
1081                         GOTO(out, err = -ENOMEM);
1082                 memcpy(lprof->lp_md, mdc, mdclen);
1083         }
1084
1085         spin_lock(&lustre_profile_list_lock);
1086         lprof->lp_refs = 1;
1087         lprof->lp_list_deleted = false;
1088
1089         list_add(&lprof->lp_list, &lustre_profile_list);
1090         spin_unlock(&lustre_profile_list_lock);
1091         RETURN(err);
1092
1093 out:
1094         if (lprof->lp_md)
1095                 OBD_FREE(lprof->lp_md, mdclen);
1096         if (lprof->lp_dt)
1097                 OBD_FREE(lprof->lp_dt, osclen);
1098         if (lprof->lp_profile)
1099                 OBD_FREE(lprof->lp_profile, proflen);
1100         OBD_FREE(lprof, sizeof(*lprof));
1101         RETURN(err);
1102 }
1103
1104 void class_del_profile(const char *prof)
1105 {
1106         struct lustre_profile *lprof;
1107
1108         ENTRY;
1109
1110         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
1111
1112         lprof = class_get_profile(prof);
1113         if (lprof) {
1114                 spin_lock(&lustre_profile_list_lock);
1115                 /* because get profile increments the ref counter */
1116                 lprof->lp_refs--;
1117                 list_del(&lprof->lp_list);
1118                 lprof->lp_list_deleted = true;
1119                 spin_unlock(&lustre_profile_list_lock);
1120
1121                 class_put_profile(lprof);
1122         }
1123         EXIT;
1124 }
1125 EXPORT_SYMBOL(class_del_profile);
1126
1127 void class_put_profile(struct lustre_profile *lprof)
1128 {
1129         spin_lock(&lustre_profile_list_lock);
1130         if ((--lprof->lp_refs) > 0) {
1131                 LASSERT(lprof->lp_refs > 0);
1132                 spin_unlock(&lustre_profile_list_lock);
1133                 return;
1134         }
1135         spin_unlock(&lustre_profile_list_lock);
1136
1137         /* confirm not a negative number */
1138         LASSERT(lprof->lp_refs == 0);
1139
1140         /*
1141          * At least one class_del_profile/profiles must be called
1142          * on the target profile or lustre_profile_list will corrupt
1143          */
1144         LASSERT(lprof->lp_list_deleted);
1145         OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
1146         OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
1147         if (lprof->lp_md)
1148                 OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
1149         OBD_FREE(lprof, sizeof(*lprof));
1150 }
1151 EXPORT_SYMBOL(class_put_profile);
1152
1153 /* COMPAT_146 */
1154 void class_del_profiles(void)
1155 {
1156         struct lustre_profile *lprof, *n;
1157         ENTRY;
1158
1159         spin_lock(&lustre_profile_list_lock);
1160         list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
1161                 list_del(&lprof->lp_list);
1162                 lprof->lp_list_deleted = true;
1163                 spin_unlock(&lustre_profile_list_lock);
1164
1165                 class_put_profile(lprof);
1166
1167                 spin_lock(&lustre_profile_list_lock);
1168         }
1169         spin_unlock(&lustre_profile_list_lock);
1170         EXIT;
1171 }
1172 EXPORT_SYMBOL(class_del_profiles);
1173
1174 /*
1175  * We can't call lquota_process_config directly because
1176  * it lives in a module that must be loaded after this one.
1177  */
1178 #ifdef HAVE_SERVER_SUPPORT
1179 static int (*quota_process_config)(struct lustre_cfg *lcfg) = NULL;
1180 #endif /* HAVE_SERVER_SUPPORT */
1181
1182 /**
1183  * Rename the proc parameter in \a cfg with a new name \a new_name.
1184  *
1185  * \param cfg      config structure which contains the proc parameter
1186  * \param new_name new name of the proc parameter
1187  *
1188  * \retval valid-pointer    pointer to the newly-allocated config structure
1189  *                          which contains the renamed proc parameter
1190  * \retval ERR_PTR(-EINVAL) if \a cfg or \a new_name is NULL, or \a cfg does
1191  *                          not contain a proc parameter
1192  * \retval ERR_PTR(-ENOMEM) if memory allocation failure occurs
1193  */
1194 struct lustre_cfg *lustre_cfg_rename(struct lustre_cfg *cfg,
1195                                      const char *new_name)
1196 {
1197         struct lustre_cfg_bufs *bufs = NULL;
1198         struct lustre_cfg *new_cfg = NULL;
1199         char *param = NULL;
1200         char *new_param = NULL;
1201         char *value = NULL;
1202         int name_len = 0;
1203         int new_len = 0;
1204
1205         ENTRY;
1206
1207         if (!cfg || !new_name)
1208                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1209
1210         param = lustre_cfg_string(cfg, 1);
1211         if (!param)
1212                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1213
1214         value = strchr(param, '=');
1215         if (value)
1216                 name_len = value - param;
1217         else
1218                 name_len = strlen(param);
1219
1220         new_len = LUSTRE_CFG_BUFLEN(cfg, 1) + strlen(new_name) - name_len;
1221
1222         OBD_ALLOC(new_param, new_len);
1223         if (!new_param)
1224                 GOTO(out_nocfg, new_cfg = ERR_PTR(-ENOMEM));
1225
1226         strlcpy(new_param, new_name, new_len);
1227         if (value)
1228                 strcat(new_param, value);
1229
1230         OBD_ALLOC_PTR(bufs);
1231         if (!bufs)
1232                 GOTO(out_free_param, new_cfg = ERR_PTR(-ENOMEM));
1233
1234         lustre_cfg_bufs_reset(bufs, NULL);
1235         lustre_cfg_bufs_init(bufs, cfg);
1236         lustre_cfg_bufs_set_string(bufs, 1, new_param);
1237
1238         OBD_ALLOC(new_cfg, lustre_cfg_len(bufs->lcfg_bufcount,
1239                                           bufs->lcfg_buflen));
1240         if (!new_cfg)
1241                 GOTO(out_free_buf, new_cfg = ERR_PTR(-ENOMEM));
1242
1243         lustre_cfg_init(new_cfg, cfg->lcfg_command, bufs);
1244
1245         new_cfg->lcfg_num = cfg->lcfg_num;
1246         new_cfg->lcfg_flags = cfg->lcfg_flags;
1247         new_cfg->lcfg_nid = cfg->lcfg_nid;
1248         new_cfg->lcfg_nal = cfg->lcfg_nal;
1249 out_free_buf:
1250         OBD_FREE_PTR(bufs);
1251 out_free_param:
1252         OBD_FREE(new_param, new_len);
1253 out_nocfg:
1254         RETURN(new_cfg);
1255 }
1256 EXPORT_SYMBOL(lustre_cfg_rename);
1257
1258 static ssize_t process_param2_config(struct lustre_cfg *lcfg)
1259 {
1260         char *param = lustre_cfg_string(lcfg, 1);
1261         char *upcall = lustre_cfg_string(lcfg, 2);
1262         struct kobject *kobj = NULL;
1263         const char *subsys = param;
1264         char *argv[] = {
1265                 [0] = "/usr/sbin/lctl",
1266                 [1] = "set_param",
1267                 [2] = param,
1268                 [3] = NULL
1269         };
1270         ktime_t start;
1271         ktime_t end;
1272         size_t len;
1273         int rc;
1274
1275         ENTRY;
1276         print_lustre_cfg(lcfg);
1277
1278         len = strcspn(param, ".=");
1279         if (!len)
1280                 return -EINVAL;
1281
1282         /* If we find '=' then its the top level sysfs directory */
1283         if (param[len] == '=')
1284                 return class_set_global(param);
1285
1286         subsys = kstrndup(param, len, GFP_KERNEL);
1287         if (!subsys)
1288                 return -ENOMEM;
1289
1290         kobj = kset_find_obj(lustre_kset, subsys);
1291         kfree(subsys);
1292         if (kobj) {
1293                 char *value = param;
1294                 char *envp[4];
1295                 int i;
1296
1297                 param = strsep(&value, "=");
1298                 envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s", param);
1299                 envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1300                 envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1301                                     ktime_get_real_seconds());
1302                 envp[3] = NULL;
1303
1304                 rc = kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
1305                 for (i = 0; i < ARRAY_SIZE(envp); i++)
1306                         kfree(envp[i]);
1307
1308                 kobject_put(kobj);
1309
1310                 RETURN(rc);
1311         }
1312
1313         /* Add upcall processing here. Now only lctl is supported */
1314         if (strcmp(upcall, LCTL_UPCALL) != 0) {
1315                 CERROR("Unsupported upcall %s\n", upcall);
1316                 RETURN(-EINVAL);
1317         }
1318
1319         start = ktime_get();
1320         rc = call_usermodehelper(argv[0], argv, NULL, UMH_WAIT_PROC);
1321         end = ktime_get();
1322
1323         if (rc < 0) {
1324                 CERROR("lctl: error invoking upcall %s %s %s: rc = %d; "
1325                        "time %ldus\n", argv[0], argv[1], argv[2], rc,
1326                        (long)ktime_us_delta(end, start));
1327         } else {
1328                 CDEBUG(D_HA, "lctl: invoked upcall %s %s %s, time %ldus\n",
1329                        argv[0], argv[1], argv[2],
1330                        (long)ktime_us_delta(end, start));
1331                        rc = 0;
1332         }
1333
1334         RETURN(rc);
1335 }
1336
1337 #ifdef HAVE_SERVER_SUPPORT
1338 void lustre_register_quota_process_config(int (*qpc)(struct lustre_cfg *lcfg))
1339 {
1340         quota_process_config = qpc;
1341 }
1342 EXPORT_SYMBOL(lustre_register_quota_process_config);
1343 #endif /* HAVE_SERVER_SUPPORT */
1344
1345 /**
1346  * Process configuration commands given in lustre_cfg form.
1347  * These may come from direct calls (e.g. class_manual_cleanup)
1348  * or processing the config llog, or ioctl from lctl.
1349  */
1350 int class_process_config(struct lustre_cfg *lcfg)
1351 {
1352         struct obd_device *obd;
1353         int err;
1354
1355         LASSERT(lcfg && !IS_ERR(lcfg));
1356         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
1357
1358         /* Commands that don't need a device */
1359         switch (lcfg->lcfg_command) {
1360         case LCFG_ATTACH: {
1361                 err = class_attach(lcfg);
1362                 GOTO(out, err);
1363         }
1364         case LCFG_ADD_UUID: {
1365                 CDEBUG(D_IOCTL,
1366                        "adding mapping from uuid %s to nid %#llx (%s)\n",
1367                        lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid,
1368                        libcfs_nid2str(lcfg->lcfg_nid));
1369
1370                 err = class_add_uuid(lustre_cfg_string(lcfg, 1),
1371                                      lcfg->lcfg_nid);
1372                 GOTO(out, err);
1373         }
1374         case LCFG_DEL_UUID: {
1375                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
1376                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) ==
1377                         0) ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
1378
1379                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
1380                 GOTO(out, err);
1381         }
1382         case LCFG_MOUNTOPT: {
1383                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
1384                        lustre_cfg_string(lcfg, 1),
1385                        lustre_cfg_string(lcfg, 2),
1386                        lustre_cfg_string(lcfg, 3));
1387                 /*
1388                  * set these mount options somewhere, so ll_fill_super
1389                  * can find them.
1390                  */
1391                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
1392                                         lustre_cfg_string(lcfg, 1),
1393                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
1394                                         lustre_cfg_string(lcfg, 2),
1395                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
1396                                         lustre_cfg_string(lcfg, 3));
1397                 GOTO(out, err);
1398         }
1399         case LCFG_DEL_MOUNTOPT: {
1400                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
1401                        lustre_cfg_string(lcfg, 1));
1402                 class_del_profile(lustre_cfg_string(lcfg, 1));
1403                 GOTO(out, err = 0);
1404         }
1405         case LCFG_SET_TIMEOUT: {
1406                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
1407                        obd_timeout, lcfg->lcfg_num);
1408                 obd_timeout = max(lcfg->lcfg_num, 1U);
1409                 obd_timeout_set = 1;
1410                 GOTO(out, err = 0);
1411         }
1412         case LCFG_SET_LDLM_TIMEOUT: {
1413                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
1414                        ldlm_timeout, lcfg->lcfg_num);
1415                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
1416                 if (ldlm_timeout >= obd_timeout)
1417                         ldlm_timeout = max(obd_timeout / 3, 1U);
1418                 ldlm_timeout_set = 1;
1419                 GOTO(out, err = 0);
1420         }
1421         case LCFG_SET_UPCALL: {
1422                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
1423                 /* COMPAT_146 Don't fail on old configs */
1424                 GOTO(out, err = 0);
1425         }
1426         case LCFG_MARKER: {
1427                 struct cfg_marker *marker;
1428
1429                 marker = lustre_cfg_buf(lcfg, 1);
1430                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
1431                        marker->cm_flags, marker->cm_tgtname,
1432                        marker->cm_comment);
1433                 GOTO(out, err = 0);
1434         }
1435         case LCFG_PARAM: {
1436                 char *tmp;
1437
1438                 /* llite has no OBD */
1439                 if (class_match_param(lustre_cfg_string(lcfg, 1),
1440                                       PARAM_LLITE, NULL) == 0) {
1441                         struct lustre_sb_info *lsi;
1442                         unsigned long addr;
1443                         ssize_t count;
1444
1445                         /*
1446                          * The instance name contains the sb:
1447                          * lustre-client-aacfe000
1448                          */
1449                         tmp = strrchr(lustre_cfg_string(lcfg, 0), '-');
1450                         if (!tmp || !*(++tmp))
1451                                 GOTO(out, err = -EINVAL);
1452
1453                         if (sscanf(tmp, "%lx", &addr) != 1)
1454                                 GOTO(out, err = -EINVAL);
1455
1456                         lsi = s2lsi((struct super_block *)addr);
1457                         /* This better be a real Lustre superblock! */
1458                         LASSERT(lsi->lsi_lmd->lmd_magic == LMD_MAGIC);
1459
1460                         count = class_modify_config(lcfg, PARAM_LLITE,
1461                                                     lsi->lsi_kobj);
1462                         err = count < 0 ? count : 0;
1463                         GOTO(out, err);
1464                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1465                                               PARAM_SYS, &tmp) == 0)) {
1466                         /* Global param settings */
1467                         err = class_set_global(tmp);
1468                         /*
1469                          * Client or server should not fail to mount if
1470                          * it hits an unknown configuration parameter.
1471                          */
1472                         if (err < 0)
1473                                 CWARN("Ignoring unknown param %s\n", tmp);
1474
1475                         GOTO(out, err = 0);
1476 #ifdef HAVE_SERVER_SUPPORT
1477                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1478                                               PARAM_QUOTA, &tmp) == 0) &&
1479                            quota_process_config) {
1480                         err = (*quota_process_config)(lcfg);
1481                         GOTO(out, err);
1482 #endif /* HAVE_SERVER_SUPPORT */
1483                 }
1484
1485                 break;
1486         }
1487         case LCFG_SET_PARAM: {
1488                 err = process_param2_config(lcfg);
1489                 GOTO(out, err = 0);
1490         }
1491         }
1492         /* Commands that require a device */
1493         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1494         if (!obd) {
1495                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
1496                         CERROR("this lcfg command requires a device name\n");
1497                 else
1498                         CERROR("no device for: %s\n",
1499                                lustre_cfg_string(lcfg, 0));
1500
1501                 GOTO(out, err = -EINVAL);
1502         }
1503         switch(lcfg->lcfg_command) {
1504         case LCFG_SETUP: {
1505                 err = class_setup(obd, lcfg);
1506                 GOTO(out, err);
1507         }
1508         case LCFG_DETACH: {
1509                 err = class_detach(obd, lcfg);
1510                 GOTO(out, err = 0);
1511         }
1512         case LCFG_CLEANUP: {
1513                 err = class_cleanup(obd, lcfg);
1514                 GOTO(out, err = 0);
1515         }
1516         case LCFG_ADD_CONN: {
1517                 err = class_add_conn(obd, lcfg);
1518                 GOTO(out, err = 0);
1519         }
1520         case LCFG_DEL_CONN: {
1521                 err = class_del_conn(obd, lcfg);
1522                 GOTO(out, err = 0);
1523         }
1524         case LCFG_POOL_NEW: {
1525                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
1526                 GOTO(out, err = 0);
1527         }
1528         case LCFG_POOL_ADD: {
1529                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
1530                                    lustre_cfg_string(lcfg, 3));
1531                 GOTO(out, err = 0);
1532         }
1533         case LCFG_POOL_REM: {
1534                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
1535                                    lustre_cfg_string(lcfg, 3));
1536                 GOTO(out, err = 0);
1537         }
1538         case LCFG_POOL_DEL: {
1539                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
1540                 GOTO(out, err = 0);
1541         }
1542         /*
1543          * Process config log ADD_MDC record twice to add MDC also to LOV
1544          * for Data-on-MDT:
1545          *
1546          * add 0:lustre-clilmv 1:lustre-MDT0000_UUID 2:0 3:1
1547          *     4:lustre-MDT0000-mdc_UUID
1548          */
1549         case LCFG_ADD_MDC: {
1550                 struct obd_device *lov_obd;
1551                 char *clilmv;
1552
1553                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1554                 if (err)
1555                         GOTO(out, err);
1556
1557                 /* make sure this is client LMV log entry */
1558                 clilmv = strstr(lustre_cfg_string(lcfg, 0), "clilmv");
1559                 if (!clilmv)
1560                         GOTO(out, err);
1561
1562                 /*
1563                  * replace 'lmv' with 'lov' name to address LOV device and
1564                  * process llog record to add MDC there.
1565                  */
1566                 clilmv[4] = 'o';
1567                 lov_obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1568                 if (lov_obd) {
1569                         err = obd_process_config(lov_obd, sizeof(*lcfg), lcfg);
1570                 } else {
1571                         err = -ENOENT;
1572                         CERROR("%s: Cannot find LOV by %s name, rc = %d\n",
1573                                obd->obd_name, lustre_cfg_string(lcfg, 0), err);
1574                 }
1575                 /* restore 'lmv' name */
1576                 clilmv[4] = 'm';
1577                 GOTO(out, err);
1578         }
1579         default: {
1580                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1581                 GOTO(out, err);
1582         }
1583         }
1584         EXIT;
1585 out:
1586         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
1587                 CWARN("Ignoring error %d on optional command %#x\n", err,
1588                       lcfg->lcfg_command);
1589                 err = 0;
1590         }
1591         return err;
1592 }
1593 EXPORT_SYMBOL(class_process_config);
1594
1595 ssize_t class_modify_config(struct lustre_cfg *lcfg, const char *prefix,
1596                             struct kobject *kobj)
1597 {
1598         struct kobj_type *typ;
1599         ssize_t count = 0;
1600         int i;
1601
1602         if (lcfg->lcfg_command != LCFG_PARAM) {
1603                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1604                 return -EINVAL;
1605         }
1606
1607         typ = get_ktype(kobj);
1608         if (!typ || !typ->default_attrs)
1609                 return -ENODEV;
1610
1611         print_lustre_cfg(lcfg);
1612
1613         /*
1614          * e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1615          * or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1616          * or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36
1617          */
1618         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1619                 struct attribute *attr;
1620                 size_t keylen;
1621                 char *value;
1622                 char *key;
1623                 int j;
1624
1625                 key = lustre_cfg_buf(lcfg, i);
1626                 /* Strip off prefix */
1627                 if (class_match_param(key, prefix, &key))
1628                         /*
1629                          * If the prefix doesn't match, return error so we
1630                          * can pass it down the stack
1631                          */
1632                         return -EINVAL;
1633
1634                 value = strchr(key, '=');
1635                 if (!value || *(value + 1) == 0) {
1636                         CERROR("%s: can't parse param '%s' (missing '=')\n",
1637                                lustre_cfg_string(lcfg, 0),
1638                                lustre_cfg_string(lcfg, i));
1639                         /* continue parsing other params */
1640                         continue;
1641                 }
1642                 keylen = value - key;
1643                 value++;
1644
1645                 attr = NULL;
1646                 for (j = 0; typ->default_attrs[j]; j++) {
1647                         if (!strncmp(typ->default_attrs[j]->name, key,
1648                                      keylen)) {
1649                                 attr = typ->default_attrs[j];
1650                                 break;
1651                         }
1652                 }
1653
1654                 if (!attr) {
1655                         char *envp[4], *param, *path;
1656
1657                         path = kobject_get_path(kobj, GFP_KERNEL);
1658                         if (!path)
1659                                 return -EINVAL;
1660
1661                         /* convert sysfs path to uevent format */
1662                         param = path;
1663                         while ((param = strchr(param, '/')) != NULL)
1664                                 *param = '.';
1665
1666                         param = strstr(path, "fs.lustre.") + 10;
1667
1668                         envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s.%.*s",
1669                                             param, (int) keylen, key);
1670                         envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1671                         envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1672                                             ktime_get_real_seconds());
1673                         envp[3] = NULL;
1674
1675                         if (kobject_uevent_env(kobj, KOBJ_CHANGE, envp)) {
1676                                 CERROR("%s: failed to send uevent %s\n",
1677                                        kobject_name(kobj), key);
1678                         }
1679
1680                         for (i = 0; i < ARRAY_SIZE(envp); i++)
1681                                 kfree(envp[i]);
1682                         kfree(path);
1683                 } else {
1684                         count += lustre_attr_store(kobj, attr, value,
1685                                                    strlen(value));
1686                 }
1687         }
1688         return count;
1689 }
1690 EXPORT_SYMBOL(class_modify_config);
1691
1692 /*
1693  * Supplemental functions for config logs, it allocates lustre_cfg
1694  * buffers plus initialized llog record header at the beginning.
1695  */
1696 struct llog_cfg_rec *lustre_cfg_rec_new(int cmd, struct lustre_cfg_bufs *bufs)
1697 {
1698         struct llog_cfg_rec *lcr;
1699         int reclen;
1700
1701         ENTRY;
1702
1703         reclen = lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen);
1704         reclen = llog_data_len(reclen) + sizeof(struct llog_rec_hdr) +
1705                  sizeof(struct llog_rec_tail);
1706
1707         OBD_ALLOC(lcr, reclen);
1708         if (!lcr)
1709                 RETURN(NULL);
1710
1711         lustre_cfg_init(&lcr->lcr_cfg, cmd, bufs);
1712
1713         lcr->lcr_hdr.lrh_len = reclen;
1714         lcr->lcr_hdr.lrh_type = OBD_CFG_REC;
1715
1716         RETURN(lcr);
1717 }
1718 EXPORT_SYMBOL(lustre_cfg_rec_new);
1719
1720 void lustre_cfg_rec_free(struct llog_cfg_rec *lcr)
1721 {
1722         ENTRY;
1723         OBD_FREE(lcr, lcr->lcr_hdr.lrh_len);
1724         EXIT;
1725 }
1726 EXPORT_SYMBOL(lustre_cfg_rec_free);
1727
1728 /**
1729  * Parse a configuration llog, doing various manipulations on them
1730  * for various reasons, (modifications for compatibility, skip obsolete
1731  * records, change uuids, etc), then class_process_config() resulting
1732  * net records.
1733  */
1734 int class_config_llog_handler(const struct lu_env *env,
1735                               struct llog_handle *handle,
1736                               struct llog_rec_hdr *rec, void *data)
1737 {
1738         struct config_llog_instance *cfg = data;
1739         int cfg_len = rec->lrh_len;
1740         char *cfg_buf = (char *) (rec + 1);
1741         int rc = 0;
1742         ENTRY;
1743
1744         /* class_config_dump_handler(handle, rec, data); */
1745
1746         switch (rec->lrh_type) {
1747         case OBD_CFG_REC: {
1748                 struct lustre_cfg *lcfg, *lcfg_new;
1749                 struct lustre_cfg_bufs bufs;
1750                 char *inst_name = NULL;
1751                 int inst_len = 0;
1752                 int swab = 0;
1753
1754                 lcfg = (struct lustre_cfg *)cfg_buf;
1755                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1756                         lustre_swab_lustre_cfg(lcfg);
1757                         swab = 1;
1758                 }
1759
1760                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1761                 if (rc)
1762                         GOTO(out, rc);
1763
1764                 /* Figure out config state info */
1765                 if (lcfg->lcfg_command == LCFG_MARKER) {
1766                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1767                         lustre_swab_cfg_marker(marker, swab,
1768                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1769                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1770                                cfg->cfg_flags, marker->cm_flags);
1771                         if (marker->cm_flags & CM_START) {
1772                                 /* all previous flags off */
1773                                 cfg->cfg_flags = CFG_F_MARKER;
1774                                 server_name2index(marker->cm_tgtname,
1775                                                   &cfg->cfg_lwp_idx, NULL);
1776                                 if (marker->cm_flags & CM_SKIP) {
1777                                         cfg->cfg_flags |= CFG_F_SKIP;
1778                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1779                                                marker->cm_step);
1780                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1781                                            (cfg->cfg_sb &&
1782                                            lustre_check_exclusion(cfg->cfg_sb,
1783                                                         marker->cm_tgtname))) {
1784                                         cfg->cfg_flags |= CFG_F_EXCLUDE;
1785                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1786                                                marker->cm_step);
1787                                 }
1788                         } else if (marker->cm_flags & CM_END) {
1789                                 cfg->cfg_flags = 0;
1790                         }
1791                 }
1792                 /*
1793                  * A config command without a start marker before it is
1794                  * illegal
1795                  */
1796                 if (!(cfg->cfg_flags & CFG_F_MARKER) &&
1797                     (lcfg->lcfg_command != LCFG_MARKER)) {
1798                         CWARN("Skip config outside markers, (inst: %016lx, uuid: %s, flags: %#x)\n",
1799                                 cfg->cfg_instance,
1800                                 cfg->cfg_uuid.uuid, cfg->cfg_flags);
1801                         cfg->cfg_flags |= CFG_F_SKIP;
1802                 }
1803                 if (cfg->cfg_flags & CFG_F_SKIP) {
1804                         CDEBUG(D_CONFIG, "skipping %#x\n",
1805                                cfg->cfg_flags);
1806                         rc = 0;
1807                         /* No processing! */
1808                         break;
1809                 }
1810
1811                 /*
1812                  * For interoperability between 1.8 and 2.0,
1813                  * rename "mds" OBD device type to "mdt".
1814                  */
1815                 {
1816                         char *typename = lustre_cfg_string(lcfg, 1);
1817                         char *index = lustre_cfg_string(lcfg, 2);
1818
1819                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1820                             strcmp(typename, "mds") == 0)) {
1821                                 CWARN("For 1.8 interoperability, rename obd "
1822                                         "type from mds to mdt\n");
1823                                 typename[2] = 't';
1824                         }
1825                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1826                             strcmp(index, "type") == 0)) {
1827                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1828                                        "set this index to '0'\n");
1829                                 index[0] = '0';
1830                                 index[1] = 0;
1831                         }
1832                 }
1833
1834 #ifdef HAVE_SERVER_SUPPORT
1835                 /* newer MDS replaces LOV/OSC with LOD/OSP */
1836                 if ((lcfg->lcfg_command == LCFG_ATTACH ||
1837                      lcfg->lcfg_command == LCFG_SET_PARAM ||
1838                      lcfg->lcfg_command == LCFG_PARAM) &&
1839                     cfg->cfg_sb && IS_MDT(s2lsi(cfg->cfg_sb))) {
1840                         char *typename = lustre_cfg_string(lcfg, 1);
1841
1842                         if (typename &&
1843                             strcmp(typename, LUSTRE_LOV_NAME) == 0) {
1844                                 CDEBUG(D_CONFIG,
1845                                        "For 2.x interoperability, rename obd "
1846                                        "type from lov to lod (%s)\n",
1847                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1848                                 strcpy(typename, LUSTRE_LOD_NAME);
1849                         }
1850                         if (typename &&
1851                             strcmp(typename, LUSTRE_OSC_NAME) == 0) {
1852                                 CDEBUG(D_CONFIG,
1853                                        "For 2.x interoperability, rename obd "
1854                                        "type from osc to osp (%s)\n",
1855                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1856                                 strcpy(typename, LUSTRE_OSP_NAME);
1857                         }
1858                 }
1859 #endif /* HAVE_SERVER_SUPPORT */
1860
1861                 if (cfg->cfg_flags & CFG_F_EXCLUDE) {
1862                         CDEBUG(D_CONFIG, "cmd: %x marked EXCLUDED\n",
1863                                lcfg->lcfg_command);
1864                         if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD)
1865                                 /* Add inactive instead */
1866                                 lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1867                 }
1868
1869                 lustre_cfg_bufs_reset(&bufs, NULL);
1870                 lustre_cfg_bufs_init(&bufs, lcfg);
1871
1872                 if (cfg->cfg_instance &&
1873                     lcfg->lcfg_command != LCFG_SPTLRPC_CONF &&
1874                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
1875                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1876                                 LUSTRE_MAXINSTANCE + 4;
1877                         OBD_ALLOC(inst_name, inst_len);
1878                         if (!inst_name)
1879                                 GOTO(out, rc = -ENOMEM);
1880                         snprintf(inst_name, inst_len, "%s-%016lx",
1881                                 lustre_cfg_string(lcfg, 0),
1882                                 cfg->cfg_instance);
1883                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1884                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1885                                lcfg->lcfg_command, inst_name);
1886                 }
1887
1888                 /* override llog UUID for clients, to insure they are unique */
1889                 if (cfg->cfg_instance && lcfg->lcfg_command == LCFG_ATTACH)
1890                         lustre_cfg_bufs_set_string(&bufs, 2,
1891                                                    cfg->cfg_uuid.uuid);
1892                 /*
1893                  * sptlrpc config record, we expect 2 data segments:
1894                  *  [0]: fs_name/target_name,
1895                  *  [1]: rule string
1896                  * moving them to index [1] and [2], and insert MGC's
1897                  * obdname at index [0].
1898                  */
1899                 if (cfg->cfg_instance &&
1900                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1901                         /* After ASLR changes cfg_instance this needs fixing */
1902                         /* "obd" is set in config_log_find_or_add() */
1903                         struct obd_device *obd = (void *)cfg->cfg_instance;
1904
1905                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1906                                             bufs.lcfg_buflen[1]);
1907                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1908                                             bufs.lcfg_buflen[0]);
1909                         lustre_cfg_bufs_set_string(&bufs, 0,
1910                                                    obd->obd_name);
1911                 }
1912
1913                 /*
1914                  * Add net info to setup command
1915                  * if given on command line.
1916                  * So config log will be:
1917                  * [0]: client name
1918                  * [1]: client UUID
1919                  * [2]: server UUID
1920                  * [3]: inactive-on-startup
1921                  * [4]: restrictive net
1922                  */
1923                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1924                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1925                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1926                         char *nidnet = lsi->lsi_lmd->lmd_nidnet;
1927
1928                         if (lcfg->lcfg_command == LCFG_SETUP &&
1929                             lcfg->lcfg_bufcount != 2 && nidnet) {
1930                                 CDEBUG(D_CONFIG, "Adding net %s info to setup "
1931                                        "command for client %s\n", nidnet,
1932                                        lustre_cfg_string(lcfg, 0));
1933                                 lustre_cfg_bufs_set_string(&bufs, 4, nidnet);
1934                         }
1935                 }
1936
1937                 /*
1938                  * Skip add_conn command if uuid is
1939                  * not on restricted net
1940                  */
1941                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1942                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1943                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1944                         char *uuid_str = lustre_cfg_string(lcfg, 1);
1945
1946                         if (lcfg->lcfg_command == LCFG_ADD_CONN &&
1947                             lsi->lsi_lmd->lmd_nidnet &&
1948                             LNET_NIDNET(libcfs_str2nid(uuid_str)) !=
1949                             libcfs_str2net(lsi->lsi_lmd->lmd_nidnet)) {
1950                                 CDEBUG(D_CONFIG, "skipping add_conn for %s\n",
1951                                        uuid_str);
1952                                 rc = 0;
1953                                 /* No processing! */
1954                                 break;
1955                         }
1956                 }
1957
1958                 OBD_ALLOC(lcfg_new, lustre_cfg_len(bufs.lcfg_bufcount,
1959                                                    bufs.lcfg_buflen));
1960                 if (!lcfg_new)
1961                         GOTO(out, rc = -ENOMEM);
1962
1963                 lustre_cfg_init(lcfg_new, lcfg->lcfg_command, &bufs);
1964                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1965                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1966
1967                 /*
1968                  * XXX Hack to try to remain binary compatible with
1969                  * pre-newconfig logs
1970                  */
1971                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1972                     (lcfg->lcfg_nid >> 32) == 0) {
1973                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1974
1975                         lcfg_new->lcfg_nid =
1976                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1977                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
1978                               lcfg->lcfg_nal, addr,
1979                               libcfs_nid2str(lcfg_new->lcfg_nid));
1980                 } else {
1981                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
1982                 }
1983
1984                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
1985
1986                 rc = class_process_config(lcfg_new);
1987                 OBD_FREE(lcfg_new, lustre_cfg_len(lcfg_new->lcfg_bufcount,
1988                                                   lcfg_new->lcfg_buflens));
1989                 if (inst_name)
1990                         OBD_FREE(inst_name, inst_len);
1991                 break;
1992         }
1993         default:
1994                 CERROR("Unknown llog record type %#x encountered\n",
1995                        rec->lrh_type);
1996                 break;
1997         }
1998 out:
1999         if (rc) {
2000                 CERROR("%s: cfg command failed: rc = %d\n",
2001                         handle->lgh_ctxt->loc_obd->obd_name, rc);
2002                 class_config_dump_handler(NULL, handle, rec, data);
2003         }
2004         RETURN(rc);
2005 }
2006 EXPORT_SYMBOL(class_config_llog_handler);
2007
2008 int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
2009                             char *name, struct config_llog_instance *cfg)
2010 {
2011         struct llog_process_cat_data cd = {
2012                 .lpcd_first_idx = 0,
2013         };
2014         struct llog_handle *llh;
2015         llog_cb_t callback;
2016         int rc;
2017         ENTRY;
2018
2019         CDEBUG(D_INFO, "looking up llog %s\n", name);
2020         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
2021         if (rc)
2022                 RETURN(rc);
2023
2024         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
2025         if (rc)
2026                 GOTO(parse_out, rc);
2027
2028         /* continue processing from where we last stopped to end-of-log */
2029         if (cfg) {
2030                 cd.lpcd_first_idx = cfg->cfg_last_idx;
2031                 callback = cfg->cfg_callback;
2032                 LASSERT(callback != NULL);
2033         } else {
2034                 callback = class_config_llog_handler;
2035         }
2036
2037         cd.lpcd_last_idx = 0;
2038
2039         rc = llog_process(env, llh, callback, cfg, &cd);
2040
2041         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
2042                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
2043         if (cfg)
2044                 cfg->cfg_last_idx = cd.lpcd_last_idx;
2045
2046 parse_out:
2047         llog_close(env, llh);
2048         RETURN(rc);
2049 }
2050 EXPORT_SYMBOL(class_config_parse_llog);
2051
2052 /**
2053  * Parse config record and output dump in supplied buffer.
2054  *
2055  * This is separated from class_config_dump_handler() to use
2056  * for ioctl needs as well
2057  *
2058  * Sample Output:
2059  * - { index: 4, event: attach, device: lustrewt-clilov, type: lov,
2060  *     UUID: lustrewt-clilov_UUID }
2061  */
2062 int class_config_yaml_output(struct llog_rec_hdr *rec, char *buf, int size)
2063 {
2064         struct lustre_cfg *lcfg = (struct lustre_cfg *)(rec + 1);
2065         char *ptr = buf;
2066         char *end = buf + size;
2067         int rc = 0, i;
2068         struct lcfg_type_data *ldata;
2069
2070         LASSERT(rec->lrh_type == OBD_CFG_REC);
2071         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2072         if (rc < 0)
2073                 return rc;
2074
2075         ldata = lcfg_cmd2data(lcfg->lcfg_command);
2076         if (!ldata)
2077                 return -ENOTTY;
2078
2079         if (lcfg->lcfg_command == LCFG_MARKER)
2080                 return 0;
2081
2082         /* form YAML entity */
2083         ptr += snprintf(ptr, end - ptr, "- { index: %u, event: %s",
2084                         rec->lrh_index, ldata->ltd_name);
2085         if (end - ptr <= 0)
2086                 goto out_overflow;
2087
2088         if (lcfg->lcfg_flags) {
2089                 ptr += snprintf(ptr, end - ptr, ", flags: %#08x",
2090                                 lcfg->lcfg_flags);
2091                 if (end - ptr <= 0)
2092                         goto out_overflow;
2093         }
2094         if (lcfg->lcfg_num) {
2095                 ptr += snprintf(ptr, end - ptr, ", num: %#08x",
2096                                 lcfg->lcfg_num);
2097                 if (end - ptr <= 0)
2098                         goto out_overflow;
2099         }
2100         if (lcfg->lcfg_nid) {
2101                 char nidstr[LNET_NIDSTR_SIZE];
2102
2103                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2104                 ptr += snprintf(ptr, end - ptr, ", nid: %s(%#llx)",
2105                                 nidstr, lcfg->lcfg_nid);
2106                 if (end - ptr <= 0)
2107                         goto out_overflow;
2108         }
2109
2110         if (LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
2111                 ptr += snprintf(ptr, end - ptr, ", device: %s",
2112                                 lustre_cfg_string(lcfg, 0));
2113                 if (end - ptr <= 0)
2114                         goto out_overflow;
2115         }
2116
2117         if (lcfg->lcfg_command == LCFG_SET_PARAM) {
2118                 /*
2119                  * set_param -P parameters have param=val here, separate
2120                  * them through pointer magic and print them out in
2121                  * native yamlese
2122                  */
2123                 char *cfg_str = lustre_cfg_string(lcfg, 1);
2124                 char *tmp = strchr(cfg_str, '=');
2125                 size_t len;
2126
2127                 if (!tmp)
2128                         goto out_done;
2129
2130                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[0]);
2131                 len = tmp - cfg_str + 1;
2132                 snprintf(ptr, len, "%s", cfg_str);
2133                 ptr += len - 1;
2134
2135                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[1]);
2136                 ptr += snprintf(ptr, end - ptr, "%s", tmp + 1);
2137
2138                 goto out_done;
2139         }
2140
2141         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
2142                 if (LUSTRE_CFG_BUFLEN(lcfg, i) > 0) {
2143                         ptr += snprintf(ptr, end - ptr, ", %s: %s",
2144                                         ldata->ltd_bufs[i - 1],
2145                                         lustre_cfg_string(lcfg, i));
2146                         if (end - ptr <= 0)
2147                                 goto out_overflow;
2148                 }
2149         }
2150
2151 out_done:
2152         ptr += snprintf(ptr, end - ptr, " }\n");
2153 out_overflow:
2154         /* Return consumed bytes.  If the buffer overflowed, zero last byte */
2155         rc = ptr - buf;
2156         if (rc > size) {
2157                 rc = -EOVERFLOW;
2158                 *(end - 1) = '\0';
2159         }
2160
2161         return rc;
2162 }
2163
2164 /**
2165  * parse config record and output dump in supplied buffer.
2166  * This is separated from class_config_dump_handler() to use
2167  * for ioctl needs as well
2168  */
2169 static int class_config_parse_rec(struct llog_rec_hdr *rec, char *buf, int size)
2170 {
2171         struct lustre_cfg       *lcfg = (struct lustre_cfg *)(rec + 1);
2172         char                    *ptr = buf;
2173         char                    *end = buf + size;
2174         int                      rc = 0;
2175
2176         ENTRY;
2177
2178         LASSERT(rec->lrh_type == OBD_CFG_REC);
2179         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2180         if (rc < 0)
2181                 RETURN(rc);
2182
2183         ptr += snprintf(ptr, end-ptr, "cmd=%05x ", lcfg->lcfg_command);
2184         if (lcfg->lcfg_flags)
2185                 ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
2186                                 lcfg->lcfg_flags);
2187
2188         if (lcfg->lcfg_num)
2189                 ptr += snprintf(ptr, end-ptr, "num=%#08x ", lcfg->lcfg_num);
2190
2191         if (lcfg->lcfg_nid) {
2192                 char nidstr[LNET_NIDSTR_SIZE];
2193
2194                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2195                 ptr += snprintf(ptr, end-ptr, "nid=%s(%#llx)    ",
2196                                 nidstr, lcfg->lcfg_nid);
2197         }
2198
2199         if (lcfg->lcfg_command == LCFG_MARKER) {
2200                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
2201
2202                 ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
2203                                 marker->cm_step, marker->cm_flags,
2204                                 marker->cm_tgtname, marker->cm_comment);
2205         } else {
2206                 int i;
2207
2208                 for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
2209                         ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
2210                                         lustre_cfg_string(lcfg, i));
2211                 }
2212         }
2213         ptr += snprintf(ptr, end - ptr, "\n");
2214         /* return consumed bytes */
2215         rc = ptr - buf;
2216         RETURN(rc);
2217 }
2218
2219 int class_config_dump_handler(const struct lu_env *env,
2220                               struct llog_handle *handle,
2221                               struct llog_rec_hdr *rec, void *data)
2222 {
2223         char *outstr;
2224         int rc = 0;
2225
2226         ENTRY;
2227
2228         OBD_ALLOC(outstr, 256);
2229         if (!outstr)
2230                 RETURN(-ENOMEM);
2231
2232         if (rec->lrh_type == OBD_CFG_REC) {
2233                 class_config_parse_rec(rec, outstr, 256);
2234                 LCONSOLE(D_WARNING, "   %s\n", outstr);
2235         } else {
2236                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
2237                 rc = -EINVAL;
2238         }
2239
2240         OBD_FREE(outstr, 256);
2241         RETURN(rc);
2242 }
2243
2244 /**
2245  * Call class_cleanup and class_detach.
2246  * "Manual" only in the sense that we're faking lcfg commands.
2247  */
2248 int class_manual_cleanup(struct obd_device *obd)
2249 {
2250         char flags[3] = "";
2251         struct lustre_cfg *lcfg;
2252         struct lustre_cfg_bufs bufs;
2253         int rc;
2254
2255         ENTRY;
2256
2257         if (!obd) {
2258                 CERROR("empty cleanup\n");
2259                 RETURN(-EALREADY);
2260         }
2261
2262         if (obd->obd_force)
2263                 strlcat(flags, "F", sizeof(flags));
2264         if (obd->obd_fail)
2265                 strlcat(flags, "A", sizeof(flags));
2266
2267         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
2268                obd->obd_name, flags);
2269
2270         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
2271         lustre_cfg_bufs_set_string(&bufs, 1, flags);
2272         OBD_ALLOC(lcfg, lustre_cfg_len(bufs.lcfg_bufcount, bufs.lcfg_buflen));
2273         if (!lcfg)
2274                 RETURN(-ENOMEM);
2275         lustre_cfg_init(lcfg, LCFG_CLEANUP, &bufs);
2276
2277         rc = class_process_config(lcfg);
2278         if (rc) {
2279                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
2280                 GOTO(out, rc);
2281         }
2282
2283         /* the lcfg is almost the same for both ops */
2284         lcfg->lcfg_command = LCFG_DETACH;
2285         rc = class_process_config(lcfg);
2286         if (rc)
2287                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
2288 out:
2289         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
2290         RETURN(rc);
2291 }
2292 EXPORT_SYMBOL(class_manual_cleanup);
2293
2294 #ifdef HAVE_SERVER_SUPPORT
2295 /*
2296  * nid<->nidstats hash operations
2297  */
2298 static unsigned
2299 nidstats_hash(struct cfs_hash *hs, const void *key, unsigned int mask)
2300 {
2301         return cfs_hash_djb2_hash(key, sizeof(lnet_nid_t), mask);
2302 }
2303
2304 static void *
2305 nidstats_key(struct hlist_node *hnode)
2306 {
2307         struct nid_stat *ns;
2308
2309         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2310
2311         return &ns->nid;
2312 }
2313
2314 static int
2315 nidstats_keycmp(const void *key, struct hlist_node *hnode)
2316 {
2317         return *(lnet_nid_t *)nidstats_key(hnode) == *(lnet_nid_t *)key;
2318 }
2319
2320 static void *
2321 nidstats_object(struct hlist_node *hnode)
2322 {
2323         return hlist_entry(hnode, struct nid_stat, nid_hash);
2324 }
2325
2326 static void
2327 nidstats_get(struct cfs_hash *hs, struct hlist_node *hnode)
2328 {
2329         struct nid_stat *ns;
2330
2331         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2332         nidstat_getref(ns);
2333 }
2334
2335 static void
2336 nidstats_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2337 {
2338         struct nid_stat *ns;
2339
2340         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2341         nidstat_putref(ns);
2342 }
2343
2344 static struct cfs_hash_ops nid_stat_hash_ops = {
2345         .hs_hash        = nidstats_hash,
2346         .hs_key         = nidstats_key,
2347         .hs_keycmp      = nidstats_keycmp,
2348         .hs_object      = nidstats_object,
2349         .hs_get         = nidstats_get,
2350         .hs_put_locked  = nidstats_put_locked,
2351 };
2352
2353
2354 /*
2355  * client_generation<->export hash operations
2356  */
2357
2358 static unsigned
2359 gen_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2360 {
2361         return cfs_hash_djb2_hash(key, sizeof(__u32), mask);
2362 }
2363
2364 static void *
2365 gen_key(struct hlist_node *hnode)
2366 {
2367         struct obd_export *exp;
2368
2369         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2370
2371         RETURN(&exp->exp_target_data.ted_lcd->lcd_generation);
2372 }
2373
2374 /*
2375  * NOTE: It is impossible to find an export that is in failed
2376  *       state with this function
2377  */
2378 static int
2379 gen_kepcmp(const void *key, struct hlist_node *hnode)
2380 {
2381         struct obd_export *exp;
2382
2383         LASSERT(key);
2384         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2385
2386         RETURN(exp->exp_target_data.ted_lcd->lcd_generation == *(__u32 *)key &&
2387                !exp->exp_failed);
2388 }
2389
2390 static void *
2391 gen_export_object(struct hlist_node *hnode)
2392 {
2393         return hlist_entry(hnode, struct obd_export, exp_gen_hash);
2394 }
2395
2396 static void
2397 gen_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
2398 {
2399         struct obd_export *exp;
2400
2401         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2402         class_export_get(exp);
2403 }
2404
2405 static void
2406 gen_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2407 {
2408         struct obd_export *exp;
2409
2410         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2411         class_export_put(exp);
2412 }
2413
2414 static struct cfs_hash_ops gen_hash_ops = {
2415         .hs_hash        = gen_hash,
2416         .hs_key         = gen_key,
2417         .hs_keycmp      = gen_kepcmp,
2418         .hs_object      = gen_export_object,
2419         .hs_get         = gen_export_get,
2420         .hs_put_locked  = gen_export_put_locked,
2421 };
2422
2423 #endif /* HAVE_SERVER_SUPPORT */