lustre/obdclass/obd_config.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/obdclass/obd_config.c
  32  *
  33  * Config API
  34  */
  35
  36 #define DEBUG_SUBSYSTEM S_CLASS
  37
  38 #include <linux/kobject.h>
  39 #include <linux/string.h>
  40
  41 #include <llog_swab.h>
  42 #include <lprocfs_status.h>
  43 #include <lustre_disk.h>
  44 #include <uapi/linux/lustre/lustre_ioctl.h>
  45 #include <lustre_log.h>
  46 #include <uapi/linux/lustre/lustre_param.h>
  47 #include <obd_class.h>
  48
  49 #include "llog_internal.h"
  50
  51 #ifdef HAVE_SERVER_SUPPORT
  52 static struct cfs_hash_ops nid_stat_hash_ops;
  53 static struct cfs_hash_ops gen_hash_ops;
  54 #endif /* HAVE_SERVER_SUPPORT */
  55
  56 /*
  57  * uuid<->export lustre hash operations
  58  */
  59 /*
  60  * NOTE: It is impossible to find an export that is in failed
  61  *      state with this function
  62  */
  63 static int
  64 uuid_keycmp(struct rhashtable_compare_arg *arg, const void *obj)
  65 {
  66         const struct obd_uuid *uuid = arg->key;
  67         const struct obd_export *exp = obj;
  68
  69         if (obd_uuid_equals(uuid, &exp->exp_client_uuid) &&
  70             !exp->exp_failed)
  71                 return 0;
  72         return -ESRCH;
  73 }
  74
  75 static void
  76 obd_export_exit(void *vexport, void *data)
  77 {
  78         struct obd_export *exp = vexport;
  79
  80         class_export_put(exp);
  81 }
  82
  83 static const struct rhashtable_params uuid_hash_params = {
  84         .key_len        = sizeof(struct obd_uuid),
  85         .key_offset     = offsetof(struct obd_export, exp_client_uuid),
  86         .head_offset    = offsetof(struct obd_export, exp_uuid_hash),
  87         .obj_cmpfn      = uuid_keycmp,
  88         .max_size       = MAX_OBD_DEVICES,
  89         .automatic_shrinking = true,
  90 };
  91
  92 int obd_uuid_add(struct obd_device *obd, struct obd_export *export)
  93 {
  94         int rc;
  95
  96         class_export_get(export);
  97         rcu_read_lock();
  98         rc = rhashtable_lookup_insert_fast(&obd->obd_uuid_hash,
  99                                            &export->exp_uuid_hash,
 100                                            uuid_hash_params);
 101         if (rc) {
 102                 class_export_put(export);
 103                 if (rc != -EEXIST) {
 104                         /* map obscure error codes to -ENOMEM */
 105                         rc = -ENOMEM;
 106                 } else {
 107                         rc = -EALREADY;
 108                 }
 109         }
 110         rcu_read_unlock();
 111
 112         return rc;
 113 }
 114 EXPORT_SYMBOL(obd_uuid_add);
 115
 116 void obd_uuid_del(struct obd_device *obd, struct obd_export *export)
 117 {
 118         int rc;
 119
 120         rcu_read_lock();
 121         rc = rhashtable_remove_fast(&obd->obd_uuid_hash,
 122                                     &export->exp_uuid_hash,
 123                                     uuid_hash_params);
 124         if (!rc)
 125                 class_export_put(export);
 126         rcu_read_unlock();
 127 }
 128 EXPORT_SYMBOL(obd_uuid_del);
 129
 130 #ifdef HAVE_SERVER_SUPPORT
 131 /* obd_uuid_lookup() is used only server side by target_handle_connect(),
 132  * mdt_hsm_agent_send(), and obd_export_evict_by_uuid().
 133  */
 134 struct obd_export *obd_uuid_lookup(struct obd_device *obd,
 135                                    struct obd_uuid *uuid)
 136 {
 137         struct obd_export *export = NULL;
 138
 139         rcu_read_lock();
 140         export = rhashtable_lookup_fast(&obd->obd_uuid_hash, uuid,
 141                                         uuid_hash_params);
 142         if (export && !refcount_inc_not_zero(&export->exp_handle.h_ref))
 143                 export = NULL;
 144         rcu_read_unlock();
 145
 146         return export;
 147 }
 148 EXPORT_SYMBOL(obd_uuid_lookup);
 149
 150 /*
 151  * nid<->export hash operations
 152  */
 153 static u32 nid_keyhash(const void *data, u32 key_len, u32 seed)
 154 {
 155         const struct obd_export *exp = data;
 156         void *key;
 157
 158         if (!exp->exp_connection)
 159                 return 0;
 160
 161         key = &exp->exp_connection->c_peer.nid;
 162         return jhash2(key, key_len / sizeof(u32), seed);
 163 }
 164
 165 /*
 166  * NOTE: It is impossible to find an export that is in failed
 167  *       state with this function
 168  */
 169 static int
 170 nid_keycmp(struct rhashtable_compare_arg *arg, const void *obj)
 171 {
 172         const struct lnet_nid *nid = arg->key;
 173         const struct obd_export *exp = obj;
 174
 175         if (nid_same(&exp->exp_connection->c_peer.nid, nid))
 176                 return 0;
 177
 178         return -ESRCH;
 179 }
 180
 181 static void
 182 nid_export_exit(void *vexport, void *data)
 183 {
 184         struct obd_export *exp = vexport;
 185
 186         class_export_put(exp);
 187 }
 188
 189 static const struct rhashtable_params nid_hash_params = {
 190         .key_len                = sizeof(struct lnet_nid),
 191         .head_offset            = offsetof(struct obd_export, exp_nid_hash),
 192         .obj_hashfn             = nid_keyhash,
 193         .obj_cmpfn              = nid_keycmp,
 194         .automatic_shrinking    = true,
 195 };
 196
 197 int obd_nid_add(struct obd_device *obd, struct obd_export *exp)
 198 {
 199         int rc;
 200
 201         if (exp == exp->exp_obd->obd_self_export || exp->exp_hashed)
 202                 return 0;
 203
 204         class_export_get(exp);
 205         rc = rhltable_insert_key(&obd->obd_nid_hash,
 206                                  &exp->exp_connection->c_peer.nid,
 207                                  &exp->exp_nid_hash,
 208                                  nid_hash_params);
 209         if (rc) {
 210                 class_export_put(exp);
 211                 /* map obscure error codes to -ENOMEM */
 212                 rc = -ENOMEM;
 213         } else {
 214                 exp->exp_hashed = 1;
 215         }
 216         return rc;
 217 }
 218 EXPORT_SYMBOL(obd_nid_add);
 219
 220 void obd_nid_del(struct obd_device *obd, struct obd_export *exp)
 221 {
 222         int rc;
 223
 224         if (exp == exp->exp_obd->obd_self_export || !exp->exp_hashed)
 225                 return;
 226
 227         rc = rhltable_remove(&obd->obd_nid_hash, &exp->exp_nid_hash,
 228                              nid_hash_params);
 229         if (rc == 0) {
 230                 class_export_put(exp);
 231                 exp->exp_hashed = 0;
 232         }
 233 }
 234 EXPORT_SYMBOL(obd_nid_del);
 235
 236 int obd_nid_export_for_each(struct obd_device *obd, struct lnet_nid *nid,
 237                             int cb(struct obd_export *exp, void *data),
 238                             void *data)
 239 {
 240         struct rhlist_head *exports, *tmp;
 241         struct obd_export *exp;
 242         int ret = 0;
 243
 244         rcu_read_lock();
 245         exports = rhltable_lookup(&obd->obd_nid_hash, nid, nid_hash_params);
 246         if (!exports) {
 247                 ret = -ENODEV;
 248                 goto out_unlock;
 249         }
 250
 251         rhl_for_each_entry_rcu(exp, tmp, exports, exp_nid_hash) {
 252                 if (!exp->exp_failed && cb(exp, data))
 253                         ret++;
 254         }
 255
 256 out_unlock:
 257         rcu_read_unlock();
 258         return ret;
 259 }
 260 EXPORT_SYMBOL(obd_nid_export_for_each);
 261 #endif /* HAVE_SERVER_SUPPORT */
 262
 263 /*********** string parsing utils *********/
 264
 265 /* returns 0 if we find this key in the buffer, else 1 */
 266 int class_find_param(char *buf, char *key, char **valp)
 267 {
 268         char *ptr;
 269
 270         if (!buf)
 271                 return 1;
 272
 273         ptr = strstr(buf, key);
 274         if (!ptr)
 275                 return 1;
 276
 277         if (valp)
 278                 *valp = ptr + strlen(key);
 279
 280         return 0;
 281 }
 282 EXPORT_SYMBOL(class_find_param);
 283
 284 /**
 285  * Check whether the proc parameter \a param is an old parameter or not from
 286  * the array \a ptr which contains the mapping from old parameters to new ones.
 287  * If it's an old one, then return the pointer to the cfg_interop_param struc-
 288  * ture which contains both the old and new parameters.
 289  *
 290  * \param param                 proc parameter
 291  * \param ptr                   an array which contains the mapping from
 292  *                              old parameters to new ones
 293  *
 294  * \retval valid-pointer        pointer to the cfg_interop_param structure
 295  *                              which contains the old and new parameters
 296  * \retval NULL                 \a param or \a ptr is NULL,
 297  *                              or \a param is not an old parameter
 298  */
 299 struct cfg_interop_param *class_find_old_param(const char *param,
 300                                                struct cfg_interop_param *ptr)
 301 {
 302         char *value = NULL;
 303         int   name_len = 0;
 304
 305         if (!param || !ptr)
 306                 RETURN(NULL);
 307
 308         value = strchr(param, '=');
 309         if (value)
 310                 name_len = value - param;
 311         else
 312                 name_len = strlen(param);
 313
 314         while (ptr->old_param) {
 315                 if (strncmp(param, ptr->old_param, name_len) == 0 &&
 316                     name_len == strlen(ptr->old_param))
 317                         RETURN(ptr);
 318                 ptr++;
 319         }
 320
 321         RETURN(NULL);
 322 }
 323 EXPORT_SYMBOL(class_find_old_param);
 324
 325 /**
 326  * Finds a parameter in \a params and copies it to \a copy.
 327  *
 328  * Leading spaces are skipped. Next space or end of string is the
 329  * parameter terminator with the exception that spaces inside single or double
 330  * quotes get included into a parameter. The parameter is copied into \a copy
 331  * which has to be allocated big enough by a caller, quotes are stripped in
 332  * the copy and the copy is terminated by 0.
 333  *
 334  * On return \a params is set to next parameter or to NULL if last
 335  * parameter is returned.
 336  *
 337  * \retval 0 if parameter is returned in \a copy
 338  * \retval 1 otherwise
 339  * \retval -EINVAL if unbalanced quota is found
 340  */
 341 int class_get_next_param(char **params, char *copy)
 342 {
 343         char *q1, *q2, *str;
 344         int len;
 345
 346         str = *params;
 347         while (*str == ' ')
 348                 str++;
 349
 350         if (*str == '\0') {
 351                 *params = NULL;
 352                 return 1;
 353         }
 354
 355         while (1) {
 356                 q1 = strpbrk(str, " '\"");
 357                 if (!q1) {
 358                         len = strlen(str);
 359                         memcpy(copy, str, len);
 360                         copy[len] = '\0';
 361                         *params = NULL;
 362                         return 0;
 363                 }
 364                 len = q1 - str;
 365                 if (*q1 == ' ') {
 366                         memcpy(copy, str, len);
 367                         copy[len] = '\0';
 368                         *params = str + len;
 369                         return 0;
 370                 }
 371
 372                 memcpy(copy, str, len);
 373                 copy += len;
 374
 375                 /* search for the matching closing quote */
 376                 str = q1 + 1;
 377                 q2 = strchr(str, *q1);
 378                 if (!q2) {
 379                         CERROR("Unbalanced quota in parameters: \"%s\"\n",
 380                                *params);
 381                         return -EINVAL;
 382                 }
 383                 len = q2 - str;
 384                 memcpy(copy, str, len);
 385                 copy += len;
 386                 str = q2 + 1;
 387         }
 388         return 1;
 389 }
 390 EXPORT_SYMBOL(class_get_next_param);
 391
 392 /*
 393  * returns 0 if this is the first key in the buffer, else 1.
 394  * valp points to first char after key.
 395  */
 396 int class_match_param(char *buf, const char *key, char **valp)
 397 {
 398         if (!buf)
 399                 return 1;
 400
 401         if (memcmp(buf, key, strlen(key)) != 0)
 402                 return 1;
 403
 404         if (valp)
 405                 *valp = buf + strlen(key);
 406
 407         return 0;
 408 }
 409 EXPORT_SYMBOL(class_match_param);
 410
 411 static int parse_nid(char *buf, void *value, int quiet)
 412 {
 413         struct lnet_nid *nid = value;
 414
 415         if (libcfs_strnid(nid, buf) == 0)
 416                 return 0;
 417
 418         if (!quiet)
 419                 LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
 420         return -EINVAL;
 421 }
 422
 423 static int parse_net(char *buf, void *value)
 424 {
 425         __u32 *net = (__u32 *)value;
 426
 427         *net = libcfs_str2net(buf);
 428         CDEBUG(D_INFO, "Net %s\n", libcfs_net2str(*net));
 429         return 0;
 430 }
 431
 432 enum {
 433         CLASS_PARSE_NID = 1,
 434         CLASS_PARSE_NET,
 435 };
 436
 437 /*
 438  * 0 is good NID,
 439  * 1 not found
 440  * < 0 error
 441  * endh is set to next separator
 442  */
 443 static int class_parse_value(char *buf, int opc, void *value, char **endh,
 444                              int quiet)
 445 {
 446         char *endp;
 447         char  tmp;
 448         int   rc = 0;
 449
 450         if (!buf)
 451                 return 1;
 452         while (*buf == ',' || *buf == ':')
 453                 buf++;
 454         if (*buf == ' ' || *buf == '/' || *buf == '\0')
 455                 return 1;
 456
 457         /* NID separators or end of NIDs */
 458         endp = strpbrk(buf, ",: /");
 459         if (!endp)
 460                 endp = buf + strlen(buf);
 461
 462         tmp = *endp;
 463         *endp = '\0';
 464         switch (opc) {
 465         default:
 466                 LBUG();
 467         case CLASS_PARSE_NID:
 468                 rc = parse_nid(buf, value, quiet);
 469                 break;
 470         case CLASS_PARSE_NET:
 471                 rc = parse_net(buf, value);
 472                 break;
 473         }
 474         *endp = tmp;
 475         if (rc != 0)
 476                 return rc;
 477         if (endh)
 478                 *endh = endp;
 479         return 0;
 480 }
 481
 482 int class_parse_nid(char *buf, struct lnet_nid *nid, char **endh)
 483 {
 484         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 0);
 485 }
 486 EXPORT_SYMBOL(class_parse_nid);
 487
 488 int class_parse_nid_quiet(char *buf, struct lnet_nid *nid, char **endh)
 489 {
 490         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 1);
 491 }
 492 EXPORT_SYMBOL(class_parse_nid_quiet);
 493
 494 int class_parse_net(char *buf, __u32 *net, char **endh)
 495 {
 496         return class_parse_value(buf, CLASS_PARSE_NET, (void *)net, endh, 0);
 497 }
 498
 499 /*
 500  * 1 param contains key and match
 501  * 0 param contains key and not match
 502  * -1 param does not contain key
 503  */
 504 int class_match_nid(char *buf, char *key, struct lnet_nid *nid)
 505 {
 506         struct lnet_nid tmp;
 507         int rc = -1;
 508
 509         while (class_find_param(buf, key, &buf) == 0) {
 510                 /*
 511                  * please restrict to the NIDs pertaining to
 512                  * the specified NIDs
 513                  */
 514                 while (class_parse_nid(buf, &tmp, &buf) == 0) {
 515                         if (nid_same(&tmp, nid))
 516                                 return 1;
 517                 }
 518                 rc = 0;
 519         }
 520         return rc;
 521 }
 522 EXPORT_SYMBOL(class_match_nid);
 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 EXPORT_SYMBOL(class_match_net);
 543
 544 char *lustre_cfg_string(struct lustre_cfg *lcfg, u32 index)
 545 {
 546         char *s;
 547
 548         if (!lcfg->lcfg_buflens[index])
 549                 return NULL;
 550
 551         s = lustre_cfg_buf(lcfg, index);
 552         if (!s)
 553                 return NULL;
 554
 555         /*
 556          * make sure it's NULL terminated, even if this kills a char
 557          * of data.  Try to use the padding first though.
 558          */
 559         if (s[lcfg->lcfg_buflens[index] - 1] != '\0') {
 560                 size_t last = ALIGN(lcfg->lcfg_buflens[index], 8) - 1;
 561                 char lost;
 562
 563                 /* Use the smaller value */
 564                 if (last > lcfg->lcfg_buflens[index])
 565                         last = lcfg->lcfg_buflens[index];
 566
 567                 lost = s[last];
 568                 s[last] = '\0';
 569                 if (lost != '\0') {
 570                         CWARN("Truncated buf %d to '%s' (lost '%c'...)\n",
 571                               index, s, lost);
 572                 }
 573         }
 574         return s;
 575 }
 576 EXPORT_SYMBOL(lustre_cfg_string);
 577
 578 /********************** class fns **********************/
 579
 580 /**
 581  * Create a new OBD device and set the type, name and uuid.  If successful,
 582  * the new device can be accessed by either name or uuid.
 583  */
 584 int class_attach(struct lustre_cfg *lcfg)
 585 {
 586         struct obd_export *exp;
 587         struct obd_device *obd = NULL;
 588         char *typename, *name, *uuid;
 589         int rc, len;
 590
 591         ENTRY;
 592
 593         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 594                 CERROR("No type passed!\n");
 595                 RETURN(-EINVAL);
 596         }
 597         typename = lustre_cfg_string(lcfg, 1);
 598
 599         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 600                 CERROR("No name passed!\n");
 601                 RETURN(-EINVAL);
 602         }
 603         name = lustre_cfg_string(lcfg, 0);
 604         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 605                 CERROR("No UUID passed!\n");
 606                 RETURN(-EINVAL);
 607         }
 608
 609         uuid = lustre_cfg_string(lcfg, 2);
 610         len = strlen(uuid);
 611         if (len >= sizeof(obd->obd_uuid)) {
 612                 CERROR("%s: uuid must be < %d bytes long\n",
 613                        name, (int)sizeof(obd->obd_uuid));
 614                 RETURN(-EINVAL);
 615         }
 616
 617         obd = class_newdev(typename, name, uuid);
 618         if (IS_ERR(obd)) { /* Already exists or out of obds */
 619                 rc = PTR_ERR(obd);
 620                 CERROR("Cannot create device %s of type %s : %d\n",
 621                        name, typename, rc);
 622                 RETURN(rc);
 623         }
 624         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 625                  "obd %p obd_magic %08X != %08X\n",
 626                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 627         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 628                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 629
 630         exp = class_new_export_self(obd, &obd->obd_uuid);
 631         if (IS_ERR(exp)) {
 632                 rc = PTR_ERR(exp);
 633                 class_free_dev(obd);
 634                 RETURN(rc);
 635         }
 636
 637         obd->obd_self_export = exp;
 638         list_del_init(&exp->exp_obd_chain_timed);
 639         class_export_put(exp);
 640
 641         rc = class_register_device(obd);
 642         if (rc != 0) {
 643                 class_decref(obd, "newdev", obd);
 644                 RETURN(rc);
 645         }
 646
 647         obd->obd_attached = 1;
 648         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 649                obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
 650
 651         RETURN(0);
 652 }
 653 EXPORT_SYMBOL(class_attach);
 654
 655 /**
 656  * Create hashes, self-export, and call type-specific setup.
 657  * Setup is effectively the "start this obd" call.
 658  */
 659 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 660 {
 661         int err = 0;
 662
 663         ENTRY;
 664
 665         LASSERT(obd != NULL);
 666         LASSERTF(obd == class_num2obd(obd->obd_minor),
 667                  "obd %p != obd_devs[%d] %p\n",
 668                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 669         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 670                  "obd %p obd_magic %08x != %08x\n",
 671                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 672
 673         /* have we attached a type to this device? */
 674         if (!obd->obd_attached) {
 675                 CERROR("Device %d not attached\n", obd->obd_minor);
 676                 RETURN(-ENODEV);
 677         }
 678
 679         if (obd->obd_set_up) {
 680                 CERROR("Device %d already setup (type %s)\n",
 681                        obd->obd_minor, obd->obd_type->typ_name);
 682                 RETURN(-EEXIST);
 683         }
 684
 685         /* is someone else setting us up right now? (attach inits spinlock) */
 686         spin_lock(&obd->obd_dev_lock);
 687         if (obd->obd_starting) {
 688                 spin_unlock(&obd->obd_dev_lock);
 689                 CERROR("Device %d setup in progress (type %s)\n",
 690                        obd->obd_minor, obd->obd_type->typ_name);
 691                 RETURN(-EEXIST);
 692         }
 693         /*
 694          * just leave this on forever.  I can't use obd_set_up here because
 695          * other fns check that status, and we're not actually set up yet.
 696          */
 697         obd->obd_starting = 1;
 698         obd->obd_nid_stats_hash = NULL;
 699         obd->obd_gen_hash = NULL;
 700         spin_unlock(&obd->obd_dev_lock);
 701
 702         /* create an uuid-export lustre hash */
 703         err = rhashtable_init(&obd->obd_uuid_hash, &uuid_hash_params);
 704         if (err)
 705                 GOTO(err_starting, err);
 706
 707 #ifdef HAVE_SERVER_SUPPORT
 708         /* create a nid-export lustre hash */
 709         err = rhltable_init(&obd->obd_nid_hash, &nid_hash_params);
 710         if (err)
 711                 GOTO(err_uuid_hash, err = -ENOMEM);
 712
 713         /* create a nid-stats lustre hash */
 714         obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
 715                                                   HASH_NID_STATS_CUR_BITS,
 716                                                   HASH_NID_STATS_MAX_BITS,
 717                                                   HASH_NID_STATS_BKT_BITS, 0,
 718                                                   CFS_HASH_MIN_THETA,
 719                                                   CFS_HASH_MAX_THETA,
 720                                                   &nid_stat_hash_ops,
 721                                                   CFS_HASH_DEFAULT);
 722         if (!obd->obd_nid_stats_hash)
 723                 GOTO(err_nid_hash, err = -ENOMEM);
 724
 725         /* create a client_generation-export lustre hash */
 726         obd->obd_gen_hash = cfs_hash_create("UUID_HASH",
 727                                             HASH_GEN_CUR_BITS,
 728                                             HASH_GEN_MAX_BITS,
 729                                             HASH_GEN_BKT_BITS, 0,
 730                                             CFS_HASH_MIN_THETA,
 731                                             CFS_HASH_MAX_THETA,
 732                                             &gen_hash_ops, CFS_HASH_DEFAULT);
 733         if (!obd->obd_gen_hash)
 734                 GOTO(err_nid_stats_hash, err = -ENOMEM);
 735 #endif /* HAVE_SERVER_SUPPORT */
 736
 737         err = obd_setup(obd, lcfg);
 738         if (err)
 739 #ifdef HAVE_SERVER_SUPPORT
 740                 GOTO(err_gen_hash, err);
 741 #else
 742                 GOTO(err_uuid_hash, err);
 743 #endif /* ! HAVE_SERVER_SUPPORT */
 744
 745         obd->obd_set_up = 1;
 746
 747         spin_lock(&obd->obd_dev_lock);
 748         /* cleanup drops this */
 749         class_incref(obd, "setup", obd);
 750         spin_unlock(&obd->obd_dev_lock);
 751
 752         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 753                obd->obd_name, obd->obd_uuid.uuid);
 754
 755         RETURN(0);
 756
 757 #ifdef HAVE_SERVER_SUPPORT
 758 err_gen_hash:
 759         if (obd->obd_gen_hash) {
 760                 cfs_hash_putref(obd->obd_gen_hash);
 761                 obd->obd_gen_hash = NULL;
 762         }
 763 err_nid_stats_hash:
 764         if (obd->obd_nid_stats_hash) {
 765                 cfs_hash_putref(obd->obd_nid_stats_hash);
 766                 obd->obd_nid_stats_hash = NULL;
 767         }
 768 err_nid_hash:
 769         rhltable_destroy(&obd->obd_nid_hash);
 770 #endif /* HAVE_SERVER_SUPPORT */
 771 err_uuid_hash:
 772         rhashtable_destroy(&obd->obd_uuid_hash);
 773 err_starting:
 774         obd->obd_starting = 0;
 775         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 776         return err;
 777 }
 778 EXPORT_SYMBOL(class_setup);
 779
 780 /**
 781  * We have finished using this OBD and are ready to destroy it.
 782  * There can be no more references to this obd.
 783  */
 784 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 785 {
 786         ENTRY;
 787
 788         if (obd->obd_set_up) {
 789                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 790                 RETURN(-EBUSY);
 791         }
 792
 793         spin_lock(&obd->obd_dev_lock);
 794         if (!obd->obd_attached) {
 795                 spin_unlock(&obd->obd_dev_lock);
 796                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 797                 RETURN(-ENODEV);
 798         }
 799         obd->obd_attached = 0;
 800         spin_unlock(&obd->obd_dev_lock);
 801
 802         /* cleanup in progress. we don't like to find this device after now */
 803         class_unregister_device(obd);
 804
 805         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 806                obd->obd_name, obd->obd_uuid.uuid);
 807
 808         class_decref(obd, "newdev", obd);
 809
 810         RETURN(0);
 811 }
 812 EXPORT_SYMBOL(class_detach);
 813
 814 /**
 815  * Start shutting down the OBD.  There may be in-progess ops when
 816  * this is called.  We tell them to start shutting down with a call
 817  * to class_disconnect_exports().
 818  */
 819 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 820 {
 821         int err = 0;
 822         char *flag;
 823         ENTRY;
 824
 825         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 826
 827         if (!obd->obd_set_up) {
 828                 CERROR("Device %d not setup\n", obd->obd_minor);
 829                 RETURN(-ENODEV);
 830         }
 831
 832         spin_lock(&obd->obd_dev_lock);
 833         if (obd->obd_stopping) {
 834                 spin_unlock(&obd->obd_dev_lock);
 835                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 836                 RETURN(-ENODEV);
 837         }
 838         /* Leave this on forever */
 839         obd->obd_stopping = 1;
 840         spin_unlock(&obd->obd_dev_lock);
 841
 842         /* wait for already-arrived-connections to finish. */
 843         while (obd->obd_conn_inprogress > 0)
 844                 yield();
 845         smp_rmb();
 846
 847         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 848                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 849                         switch (*flag) {
 850                         case 'F':
 851                                 obd->obd_force = 1;
 852                                 break;
 853                         case 'A':
 854                                 LCONSOLE(D_WARNING, "Failing over %s\n",
 855                                          obd->obd_name);
 856                                 spin_lock(&obd->obd_dev_lock);
 857                                 obd->obd_fail = 1;
 858 #ifdef HAVE_SERVER_SUPPORT
 859                                 obd->obd_no_transno = 1;
 860 #endif
 861                                 obd->obd_no_recov = 1;
 862                                 spin_unlock(&obd->obd_dev_lock);
 863                                 if (OBP(obd, iocontrol)) {
 864                                         obd_iocontrol(OBD_IOC_SYNC,
 865                                                       obd->obd_self_export,
 866                                                       0, NULL, NULL);
 867                                 }
 868                                 break;
 869                         default:
 870                                 CERROR("Unrecognised flag '%c'\n", *flag);
 871                         }
 872         }
 873
 874         LASSERT(obd->obd_self_export);
 875
 876         CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d/%d\n",
 877                obd->obd_name, obd->obd_num_exports,
 878                atomic_read(&obd->obd_refcount) - 2);
 879         dump_exports(obd, 0, D_HA);
 880         class_disconnect_exports(obd);
 881
 882         /* Precleanup, we must make sure all exports get destroyed. */
 883         err = obd_precleanup(obd);
 884         if (err)
 885                 CERROR("Precleanup %s returned %d\n",
 886                        obd->obd_name, err);
 887
 888         /* destroy an uuid-export hash body */
 889         rhashtable_free_and_destroy(&obd->obd_uuid_hash, obd_export_exit,
 890                                     NULL);
 891 #ifdef HAVE_SERVER_SUPPORT
 892         /* destroy a nid-export hash body */
 893         rhltable_free_and_destroy(&obd->obd_nid_hash, nid_export_exit, NULL);
 894
 895         /* destroy a nid-stats hash body */
 896         if (obd->obd_nid_stats_hash) {
 897                 cfs_hash_putref(obd->obd_nid_stats_hash);
 898                 obd->obd_nid_stats_hash = NULL;
 899         }
 900
 901         /* destroy a client_generation-export hash body */
 902         if (obd->obd_gen_hash) {
 903                 cfs_hash_putref(obd->obd_gen_hash);
 904                 obd->obd_gen_hash = NULL;
 905         }
 906 #endif /* HAVE_SERVER_SUPPORT */
 907         class_decref(obd, "setup", obd);
 908         obd->obd_set_up = 0;
 909
 910         RETURN(0);
 911 }
 912
 913 struct obd_device *class_incref(struct obd_device *obd,
 914                                 const char *scope,
 915                                 const void *source)
 916 {
 917         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 918         atomic_inc(&obd->obd_refcount);
 919         CDEBUG(D_INFO, "incref %s (%p) now %d - %s\n", obd->obd_name, obd,
 920                atomic_read(&obd->obd_refcount), scope);
 921
 922         return obd;
 923 }
 924 EXPORT_SYMBOL(class_incref);
 925
 926 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 927 {
 928         int last;
 929
 930         CDEBUG(D_INFO, "Decref %s (%p) now %d - %s\n", obd->obd_name, obd,
 931                atomic_read(&obd->obd_refcount), scope);
 932
 933         LASSERT(obd->obd_num_exports >= 0);
 934         last = atomic_dec_and_test(&obd->obd_refcount);
 935         lu_ref_del(&obd->obd_reference, scope, source);
 936
 937         if (last) {
 938                 struct obd_export *exp;
 939
 940                 LASSERT(!obd->obd_attached);
 941                 /*
 942                  * All exports have been destroyed; there should
 943                  * be no more in-progress ops by this point.
 944                  */
 945                 exp = obd->obd_self_export;
 946
 947                 if (exp) {
 948                         exp->exp_flags |= exp_flags_from_obd(obd);
 949                         class_unlink_export(exp);
 950                 }
 951         }
 952 }
 953 EXPORT_SYMBOL(class_decref);
 954
 955 /**
 956  * Add a failover NID location.
 957  * Client OBD types contact server OBD types using this NID list.
 958  */
 959 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 960 {
 961         struct obd_import *imp;
 962         struct obd_uuid uuid;
 963         int rc;
 964
 965         ENTRY;
 966
 967         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 968             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 969                 CERROR("invalid conn_uuid\n");
 970                 RETURN(-EINVAL);
 971         }
 972         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 973             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
 974             strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) &&
 975             strcmp(obd->obd_type->typ_name, LUSTRE_LWP_NAME) &&
 976             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
 977                 CERROR("can't add connection on non-client dev\n");
 978                 RETURN(-EINVAL);
 979         }
 980
 981         imp = obd->u.cli.cl_import;
 982         if (!imp) {
 983                 CERROR("try to add conn on immature client dev\n");
 984                 RETURN(-EINVAL);
 985         }
 986
 987         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 988         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
 989
 990         RETURN(rc);
 991 }
 992 EXPORT_SYMBOL(class_add_conn);
 993
 994 /** Remove a failover NID location. */
 995 static int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 996 {
 997         struct obd_import *imp;
 998         struct obd_uuid uuid;
 999         int rc;
1000
1001         ENTRY;
1002
1003         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
1004             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
1005                 CERROR("invalid conn_uuid\n");
1006                 RETURN(-EINVAL);
1007         }
1008         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
1009             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
1010                 CERROR("can't del connection on non-client dev\n");
1011                 RETURN(-EINVAL);
1012         }
1013
1014         imp = obd->u.cli.cl_import;
1015         if (!imp) {
1016                 CERROR("try to del conn on immature client dev\n");
1017                 RETURN(-EINVAL);
1018         }
1019
1020         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
1021         rc = obd_del_conn(imp, &uuid);
1022
1023         RETURN(rc);
1024 }
1025
1026 static LIST_HEAD(lustre_profile_list);
1027 static DEFINE_SPINLOCK(lustre_profile_list_lock);
1028
1029 static struct lustre_profile *class_get_profile_nolock(const char *prof)
1030 {
1031         struct lustre_profile *lprof;
1032
1033         ENTRY;
1034         list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
1035                 if (strcmp(lprof->lp_profile, prof) == 0) {
1036                         lprof->lp_refs++;
1037                         RETURN(lprof);
1038                 }
1039         }
1040         RETURN(NULL);
1041 }
1042
1043 struct lustre_profile *class_get_profile(const char *prof)
1044 {
1045         struct lustre_profile *lprof;
1046
1047         ENTRY;
1048         spin_lock(&lustre_profile_list_lock);
1049         lprof = class_get_profile_nolock(prof);
1050         spin_unlock(&lustre_profile_list_lock);
1051         RETURN(lprof);
1052 }
1053 EXPORT_SYMBOL(class_get_profile);
1054
1055 /**
1056  * Create a named "profile".
1057  * This defines the MDC and OSC names to use for a client.
1058  * This also is used to define the LOV to be used by a MDT.
1059  */
1060 static int class_add_profile(int proflen, char *prof, int osclen, char *osc,
1061                              int mdclen, char *mdc)
1062 {
1063         struct lustre_profile *lprof;
1064         int err = 0;
1065
1066         ENTRY;
1067
1068         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
1069
1070         OBD_ALLOC(lprof, sizeof(*lprof));
1071         if (!lprof)
1072                 RETURN(-ENOMEM);
1073         INIT_LIST_HEAD(&lprof->lp_list);
1074
1075         LASSERT(proflen == (strlen(prof) + 1));
1076         OBD_ALLOC(lprof->lp_profile, proflen);
1077         if (!lprof->lp_profile)
1078                 GOTO(out, err = -ENOMEM);
1079         memcpy(lprof->lp_profile, prof, proflen);
1080
1081         LASSERT(osclen == (strlen(osc) + 1));
1082         OBD_ALLOC(lprof->lp_dt, osclen);
1083         if (!lprof->lp_dt)
1084                 GOTO(out, err = -ENOMEM);
1085         memcpy(lprof->lp_dt, osc, osclen);
1086
1087         if (mdclen > 0) {
1088                 LASSERT(mdclen == (strlen(mdc) + 1));
1089                 OBD_ALLOC(lprof->lp_md, mdclen);
1090                 if (!lprof->lp_md)
1091                         GOTO(out, err = -ENOMEM);
1092                 memcpy(lprof->lp_md, mdc, mdclen);
1093         }
1094
1095         spin_lock(&lustre_profile_list_lock);
1096         lprof->lp_refs = 1;
1097         lprof->lp_list_deleted = false;
1098
1099         list_add(&lprof->lp_list, &lustre_profile_list);
1100         spin_unlock(&lustre_profile_list_lock);
1101         RETURN(err);
1102
1103 out:
1104         if (lprof->lp_md)
1105                 OBD_FREE(lprof->lp_md, mdclen);
1106         if (lprof->lp_dt)
1107                 OBD_FREE(lprof->lp_dt, osclen);
1108         if (lprof->lp_profile)
1109                 OBD_FREE(lprof->lp_profile, proflen);
1110         OBD_FREE(lprof, sizeof(*lprof));
1111         RETURN(err);
1112 }
1113
1114 void class_del_profile(const char *prof)
1115 {
1116         struct lustre_profile *lprof;
1117
1118         ENTRY;
1119
1120         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
1121
1122         spin_lock(&lustre_profile_list_lock);
1123         lprof = class_get_profile_nolock(prof);
1124         if (lprof) {
1125                 /* because get profile increments the ref counter */
1126                 lprof->lp_refs--;
1127                 list_del(&lprof->lp_list);
1128                 lprof->lp_list_deleted = true;
1129                 spin_unlock(&lustre_profile_list_lock);
1130
1131                 class_put_profile(lprof);
1132         } else {
1133                 spin_unlock(&lustre_profile_list_lock);
1134         }
1135         EXIT;
1136 }
1137 EXPORT_SYMBOL(class_del_profile);
1138
1139 void class_put_profile(struct lustre_profile *lprof)
1140 {
1141         spin_lock(&lustre_profile_list_lock);
1142         if ((--lprof->lp_refs) > 0) {
1143                 LASSERT(lprof->lp_refs > 0);
1144                 spin_unlock(&lustre_profile_list_lock);
1145                 return;
1146         }
1147         spin_unlock(&lustre_profile_list_lock);
1148
1149         /* confirm not a negative number */
1150         LASSERT(lprof->lp_refs == 0);
1151
1152         /*
1153          * At least one class_del_profile/profiles must be called
1154          * on the target profile or lustre_profile_list will corrupt
1155          */
1156         LASSERT(lprof->lp_list_deleted);
1157         OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
1158         OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
1159         if (lprof->lp_md)
1160                 OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
1161         OBD_FREE(lprof, sizeof(*lprof));
1162 }
1163 EXPORT_SYMBOL(class_put_profile);
1164
1165 /* COMPAT_146 */
1166 void class_del_profiles(void)
1167 {
1168         struct lustre_profile *lprof, *n;
1169         ENTRY;
1170
1171         spin_lock(&lustre_profile_list_lock);
1172         list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
1173                 list_del(&lprof->lp_list);
1174                 lprof->lp_list_deleted = true;
1175                 spin_unlock(&lustre_profile_list_lock);
1176
1177                 class_put_profile(lprof);
1178
1179                 spin_lock(&lustre_profile_list_lock);
1180         }
1181         spin_unlock(&lustre_profile_list_lock);
1182         EXIT;
1183 }
1184 EXPORT_SYMBOL(class_del_profiles);
1185
1186 /*
1187  * We can't call lquota_process_config directly because
1188  * it lives in a module that must be loaded after this one.
1189  */
1190 #ifdef HAVE_SERVER_SUPPORT
1191 static int (*quota_process_config)(struct lustre_cfg *lcfg) = NULL;
1192 #endif /* HAVE_SERVER_SUPPORT */
1193
1194 /**
1195  * Rename the proc parameter in \a cfg with a new name \a new_name.
1196  *
1197  * \param cfg      config structure which contains the proc parameter
1198  * \param new_name new name of the proc parameter
1199  *
1200  * \retval valid-pointer    pointer to the newly-allocated config structure
1201  *                          which contains the renamed proc parameter
1202  * \retval ERR_PTR(-EINVAL) if \a cfg or \a new_name is NULL, or \a cfg does
1203  *                          not contain a proc parameter
1204  * \retval ERR_PTR(-ENOMEM) if memory allocation failure occurs
1205  */
1206 struct lustre_cfg *lustre_cfg_rename(struct lustre_cfg *cfg,
1207                                      const char *new_name)
1208 {
1209         struct lustre_cfg_bufs *bufs = NULL;
1210         struct lustre_cfg *new_cfg = NULL;
1211         char *param = NULL;
1212         char *new_param = NULL;
1213         char *value = NULL;
1214         int name_len = 0;
1215         int new_len = 0;
1216
1217         ENTRY;
1218
1219         if (!cfg || !new_name)
1220                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1221
1222         param = lustre_cfg_string(cfg, 1);
1223         if (!param)
1224                 GOTO(out_nocfg, new_cfg = ERR_PTR(-EINVAL));
1225
1226         value = strchr(param, '=');
1227         if (value)
1228                 name_len = value - param;
1229         else
1230                 name_len = strlen(param);
1231
1232         new_len = LUSTRE_CFG_BUFLEN(cfg, 1) + strlen(new_name) - name_len;
1233
1234         OBD_ALLOC(new_param, new_len);
1235         if (!new_param)
1236                 GOTO(out_nocfg, new_cfg = ERR_PTR(-ENOMEM));
1237
1238         strlcpy(new_param, new_name, new_len);
1239         if (value)
1240                 strcat(new_param, value);
1241
1242         OBD_ALLOC_PTR(bufs);
1243         if (!bufs)
1244                 GOTO(out_free_param, new_cfg = ERR_PTR(-ENOMEM));
1245
1246         lustre_cfg_bufs_reset(bufs, NULL);
1247         lustre_cfg_bufs_init(bufs, cfg);
1248         lustre_cfg_bufs_set_string(bufs, 1, new_param);
1249
1250         OBD_ALLOC(new_cfg, lustre_cfg_len(bufs->lcfg_bufcount,
1251                                           bufs->lcfg_buflen));
1252         if (!new_cfg)
1253                 GOTO(out_free_buf, new_cfg = ERR_PTR(-ENOMEM));
1254
1255         lustre_cfg_init(new_cfg, cfg->lcfg_command, bufs);
1256
1257         new_cfg->lcfg_num = cfg->lcfg_num;
1258         new_cfg->lcfg_flags = cfg->lcfg_flags;
1259         new_cfg->lcfg_nid = cfg->lcfg_nid;
1260         new_cfg->lcfg_nal = cfg->lcfg_nal;
1261 out_free_buf:
1262         OBD_FREE_PTR(bufs);
1263 out_free_param:
1264         OBD_FREE(new_param, new_len);
1265 out_nocfg:
1266         RETURN(new_cfg);
1267 }
1268 EXPORT_SYMBOL(lustre_cfg_rename);
1269
1270 static ssize_t process_param2_config(struct lustre_cfg *lcfg)
1271 {
1272         char *param = lustre_cfg_string(lcfg, 1);
1273         char *upcall = lustre_cfg_string(lcfg, 2);
1274         struct kobject *kobj = NULL;
1275         const char *subsys = param;
1276         char *newparam = NULL;
1277         char *argv[] = {
1278                 [0] = "/usr/sbin/lctl",
1279                 [1] = "set_param",
1280                 [2] = param,
1281                 [3] = NULL
1282         };
1283         ktime_t start;
1284         ktime_t end;
1285         size_t len;
1286         int rc;
1287
1288         ENTRY;
1289         print_lustre_cfg(lcfg);
1290
1291         len = strcspn(param, ".=");
1292         if (!len)
1293                 RETURN(-EINVAL);
1294
1295         /* If we find '=' then its the top level sysfs directory */
1296         if (param[len] == '=')
1297                 RETURN(class_set_global(param));
1298
1299         subsys = kstrndup(param, len, GFP_KERNEL);
1300         if (!subsys)
1301                 RETURN(-ENOMEM);
1302
1303         kobj = kset_find_obj(lustre_kset, subsys);
1304         kfree(subsys);
1305         if (kobj) {
1306                 char *value = param;
1307                 char *envp[4];
1308                 int i;
1309
1310                 param = strsep(&value, "=");
1311                 envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s", param);
1312                 envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1313                 envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1314                                     ktime_get_real_seconds());
1315                 envp[3] = NULL;
1316
1317                 rc = kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
1318                 for (i = 0; i < ARRAY_SIZE(envp); i++)
1319                         kfree(envp[i]);
1320
1321                 kobject_put(kobj);
1322
1323                 RETURN(rc);
1324         }
1325
1326         /* Add upcall processing here. Now only lctl is supported */
1327         if (strcmp(upcall, LCTL_UPCALL) != 0) {
1328                 CERROR("Unsupported upcall %s\n", upcall);
1329                 RETURN(-EINVAL);
1330         }
1331
1332         /* root_squash and nosquash_nids settings must be applied to
1333          * global subsystem (*.) so that it is taken into account by
1334          * both client and server sides. So do the equivalent of a
1335          * 's / mdt. / *. /'.
1336          */
1337         if ((strstr(param, PARAM_NOSQUASHNIDS) ||
1338              strstr(param, PARAM_ROOTSQUASH)) &&
1339             (param[0] != '*' || param[1] != '.')) {
1340                 newparam = kmalloc(strlen(param) + 1, GFP_NOFS);
1341                 if (!newparam)
1342                         RETURN(-ENOMEM);
1343
1344                 snprintf(newparam, strlen(param) + 1, "*%s", param + len);
1345                 argv[2] = (char *)newparam;
1346         }
1347
1348         start = ktime_get();
1349         rc = call_usermodehelper(argv[0], argv, NULL, UMH_WAIT_PROC);
1350         end = ktime_get();
1351
1352         if (rc < 0) {
1353                 CERROR("lctl: error invoking upcall %s %s %s: rc = %d; "
1354                        "time %ldus\n", argv[0], argv[1], argv[2], rc,
1355                        (long)ktime_us_delta(end, start));
1356         } else {
1357                 CDEBUG(D_HA, "lctl: invoked upcall %s %s %s, time %ldus\n",
1358                        argv[0], argv[1], argv[2],
1359                        (long)ktime_us_delta(end, start));
1360                        rc = 0;
1361         }
1362
1363         kfree(newparam);
1364         RETURN(rc);
1365 }
1366
1367 #ifdef HAVE_SERVER_SUPPORT
1368 void lustre_register_quota_process_config(int (*qpc)(struct lustre_cfg *lcfg))
1369 {
1370         quota_process_config = qpc;
1371 }
1372 EXPORT_SYMBOL(lustre_register_quota_process_config);
1373 #endif /* HAVE_SERVER_SUPPORT */
1374
1375 /**
1376  * Process configuration commands given in lustre_cfg form.
1377  * These may come from direct calls (e.g. class_manual_cleanup)
1378  * or processing the config llog, or ioctl from lctl.
1379  */
1380 int class_process_config(struct lustre_cfg *lcfg)
1381 {
1382         struct obd_device *obd;
1383         struct lnet_nid nid;
1384         int err;
1385
1386         LASSERT(lcfg && !IS_ERR(lcfg));
1387         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
1388
1389         /* Commands that don't need a device */
1390         switch (lcfg->lcfg_command) {
1391         case LCFG_ATTACH: {
1392                 err = class_attach(lcfg);
1393                 GOTO(out, err);
1394         }
1395         case LCFG_ADD_UUID: {
1396                 CDEBUG(D_IOCTL,
1397                        "adding mapping from uuid %s to nid %#llx (%s)\n",
1398                        lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid,
1399                        libcfs_nid2str(lcfg->lcfg_nid));
1400
1401                 lnet_nid4_to_nid(lcfg->lcfg_nid, &nid);
1402                 err = class_add_uuid(lustre_cfg_string(lcfg, 1), &nid);
1403                 GOTO(out, err);
1404         }
1405         case LCFG_DEL_UUID: {
1406                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
1407                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) ==
1408                         0) ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
1409
1410                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
1411                 GOTO(out, err);
1412         }
1413         case LCFG_MOUNTOPT: {
1414                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
1415                        lustre_cfg_string(lcfg, 1),
1416                        lustre_cfg_string(lcfg, 2),
1417                        lustre_cfg_string(lcfg, 3));
1418                 /*
1419                  * set these mount options somewhere, so ll_fill_super
1420                  * can find them.
1421                  */
1422                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
1423                                         lustre_cfg_string(lcfg, 1),
1424                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
1425                                         lustre_cfg_string(lcfg, 2),
1426                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
1427                                         lustre_cfg_string(lcfg, 3));
1428                 GOTO(out, err);
1429         }
1430         case LCFG_DEL_MOUNTOPT: {
1431                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
1432                        lustre_cfg_string(lcfg, 1));
1433                 class_del_profile(lustre_cfg_string(lcfg, 1));
1434                 GOTO(out, err = 0);
1435         }
1436         case LCFG_SET_TIMEOUT: {
1437                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
1438                        obd_timeout, lcfg->lcfg_num);
1439                 obd_timeout = max(lcfg->lcfg_num, 1U);
1440                 ping_interval = max(obd_timeout / 4, 1U);
1441                 obd_timeout_set = 1;
1442                 GOTO(out, err = 0);
1443         }
1444         case LCFG_SET_LDLM_TIMEOUT: {
1445                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
1446                        ldlm_timeout, lcfg->lcfg_num);
1447                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
1448                 if (ldlm_timeout >= obd_timeout)
1449                         ldlm_timeout = max(obd_timeout / 3, 1U);
1450                 ldlm_timeout_set = 1;
1451                 GOTO(out, err = 0);
1452         }
1453         case LCFG_SET_UPCALL: {
1454                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
1455                 /* COMPAT_146 Don't fail on old configs */
1456                 GOTO(out, err = 0);
1457         }
1458         case LCFG_MARKER: {
1459                 struct cfg_marker *marker;
1460
1461                 marker = lustre_cfg_buf(lcfg, 1);
1462                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
1463                        marker->cm_flags, marker->cm_tgtname,
1464                        marker->cm_comment);
1465                 GOTO(out, err = 0);
1466         }
1467         case LCFG_PARAM: {
1468                 char *tmp;
1469
1470                 /* llite has no OBD */
1471                 if (class_match_param(lustre_cfg_string(lcfg, 1),
1472                                       PARAM_LLITE, NULL) == 0) {
1473                         struct lustre_sb_info *lsi;
1474                         unsigned long addr;
1475                         ssize_t count;
1476
1477                         /*
1478                          * The instance name contains the sb:
1479                          * lustre-client-aacfe000
1480                          */
1481                         tmp = strrchr(lustre_cfg_string(lcfg, 0), '-');
1482                         if (!tmp || !*(++tmp))
1483                                 GOTO(out, err = -EINVAL);
1484
1485                         if (sscanf(tmp, "%lx", &addr) != 1)
1486                                 GOTO(out, err = -EINVAL);
1487
1488                         lsi = s2lsi((struct super_block *)addr);
1489                         /* This better be a real Lustre superblock! */
1490                         LASSERT(lsi->lsi_lmd->lmd_magic == LMD_MAGIC);
1491
1492                         count = class_modify_config(lcfg, PARAM_LLITE,
1493                                                     lsi->lsi_kobj);
1494                         err = count < 0 ? count : 0;
1495                         GOTO(out, err);
1496                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1497                                               PARAM_SYS, &tmp) == 0)) {
1498                         /* Global param settings */
1499                         err = class_set_global(tmp);
1500                         /*
1501                          * Client or server should not fail to mount if
1502                          * it hits an unknown configuration parameter.
1503                          */
1504                         if (err < 0)
1505                                 CWARN("Ignoring unknown param %s\n", tmp);
1506
1507                         GOTO(out, err = 0);
1508 #ifdef HAVE_SERVER_SUPPORT
1509                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1510                                               PARAM_QUOTA, &tmp) == 0) &&
1511                            quota_process_config) {
1512                         err = (*quota_process_config)(lcfg);
1513                         GOTO(out, err);
1514 #endif /* HAVE_SERVER_SUPPORT */
1515                 }
1516
1517                 break;
1518         }
1519         case LCFG_SET_PARAM: {
1520                 err = process_param2_config(lcfg);
1521                 GOTO(out, err = 0);
1522         }
1523         }
1524         /* Commands that require a device */
1525         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1526         if (!obd) {
1527                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
1528                         CERROR("this lcfg command requires a device name\n");
1529                 else
1530                         CERROR("no device for: %s\n",
1531                                lustre_cfg_string(lcfg, 0));
1532
1533                 GOTO(out, err = -EINVAL);
1534         }
1535         switch(lcfg->lcfg_command) {
1536         case LCFG_SETUP: {
1537                 err = class_setup(obd, lcfg);
1538                 GOTO(out, err);
1539         }
1540         case LCFG_DETACH: {
1541                 err = class_detach(obd, lcfg);
1542                 GOTO(out, err = 0);
1543         }
1544         case LCFG_CLEANUP: {
1545                 err = class_cleanup(obd, lcfg);
1546                 GOTO(out, err = 0);
1547         }
1548         case LCFG_ADD_CONN: {
1549                 err = class_add_conn(obd, lcfg);
1550                 GOTO(out, err = 0);
1551         }
1552         case LCFG_DEL_CONN: {
1553                 err = class_del_conn(obd, lcfg);
1554                 GOTO(out, err = 0);
1555         }
1556         case LCFG_POOL_NEW: {
1557                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
1558                 GOTO(out, err = 0);
1559         }
1560         case LCFG_POOL_ADD: {
1561                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
1562                                    lustre_cfg_string(lcfg, 3));
1563                 GOTO(out, err = 0);
1564         }
1565         case LCFG_POOL_REM: {
1566                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
1567                                    lustre_cfg_string(lcfg, 3));
1568                 GOTO(out, err = 0);
1569         }
1570         case LCFG_POOL_DEL: {
1571                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
1572                 GOTO(out, err = 0);
1573         }
1574         /*
1575          * Process config log ADD_MDC record twice to add MDC also to LOV
1576          * for Data-on-MDT:
1577          *
1578          * add 0:lustre-clilmv 1:lustre-MDT0000_UUID 2:0 3:1
1579          *     4:lustre-MDT0000-mdc_UUID
1580          */
1581         case LCFG_ADD_MDC: {
1582                 struct obd_device *lov_obd;
1583                 char *clilmv;
1584
1585                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1586                 if (err)
1587                         GOTO(out, err);
1588
1589                 /* make sure this is client LMV log entry */
1590                 clilmv = strstr(lustre_cfg_string(lcfg, 0), "clilmv");
1591                 if (!clilmv)
1592                         GOTO(out, err);
1593
1594                 /*
1595                  * replace 'lmv' with 'lov' name to address LOV device and
1596                  * process llog record to add MDC there.
1597                  */
1598                 clilmv[4] = 'o';
1599                 lov_obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1600                 if (lov_obd) {
1601                         err = obd_process_config(lov_obd, sizeof(*lcfg), lcfg);
1602                 } else {
1603                         err = -ENOENT;
1604                         CERROR("%s: Cannot find LOV by %s name, rc = %d\n",
1605                                obd->obd_name, lustre_cfg_string(lcfg, 0), err);
1606                 }
1607                 /* restore 'lmv' name */
1608                 clilmv[4] = 'm';
1609                 GOTO(out, err);
1610         }
1611         default: {
1612                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1613                 GOTO(out, err);
1614         }
1615         }
1616         EXIT;
1617 out:
1618         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
1619                 CWARN("Ignoring error %d on optional command %#x\n", err,
1620                       lcfg->lcfg_command);
1621                 err = 0;
1622         }
1623         return err;
1624 }
1625 EXPORT_SYMBOL(class_process_config);
1626
1627 ssize_t class_modify_config(struct lustre_cfg *lcfg, const char *prefix,
1628                             struct kobject *kobj)
1629 {
1630         const struct kobj_type *typ;
1631         ssize_t count = 0;
1632         int i;
1633
1634         if (lcfg->lcfg_command != LCFG_PARAM) {
1635                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1636                 return -EINVAL;
1637         }
1638
1639         typ = get_ktype(kobj);
1640         if (!typ || !typ->default_groups)
1641                 return -ENODEV;
1642
1643         print_lustre_cfg(lcfg);
1644
1645         /*
1646          * e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1647          * or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1648          * or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36
1649          */
1650         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1651                 struct attribute *attr = NULL;
1652                 size_t keylen;
1653                 char *value;
1654                 char *key;
1655
1656                 key = lustre_cfg_buf(lcfg, i);
1657                 /* Strip off prefix */
1658                 if (class_match_param(key, prefix, &key))
1659                         /*
1660                          * If the prefix doesn't match, return error so we
1661                          * can pass it down the stack
1662                          */
1663                         return -EINVAL;
1664
1665                 value = strchr(key, '=');
1666                 if (!value || *(value + 1) == 0) {
1667                         CERROR("%s: can't parse param '%s' (missing '=')\n",
1668                                lustre_cfg_string(lcfg, 0),
1669                                lustre_cfg_string(lcfg, i));
1670                         /* continue parsing other params */
1671                         continue;
1672                 }
1673                 keylen = value - key;
1674                 value++;
1675
1676                 attr = get_attr_starts_with(typ, key, keylen);
1677                 if (!attr) {
1678                         char *envp[4], *param, *path;
1679
1680                         path = kobject_get_path(kobj, GFP_KERNEL);
1681                         if (!path)
1682                                 return -EINVAL;
1683
1684                         /* convert sysfs path to uevent format */
1685                         param = path;
1686                         while ((param = strchr(param, '/')) != NULL)
1687                                 *param = '.';
1688
1689                         param = strstr(path, "fs.lustre.") + 10;
1690
1691                         envp[0] = kasprintf(GFP_KERNEL, "PARAM=%s.%.*s",
1692                                             param, (int) keylen, key);
1693                         envp[1] = kasprintf(GFP_KERNEL, "SETTING=%s", value);
1694                         envp[2] = kasprintf(GFP_KERNEL, "TIME=%lld",
1695                                             ktime_get_real_seconds());
1696                         envp[3] = NULL;
1697
1698                         if (kobject_uevent_env(kobj, KOBJ_CHANGE, envp)) {
1699                                 CERROR("%s: failed to send uevent %s\n",
1700                                        kobject_name(kobj), key);
1701                         }
1702
1703                         for (i = 0; i < ARRAY_SIZE(envp); i++)
1704                                 kfree(envp[i]);
1705                         kfree(path);
1706                 } else {
1707                         count += lustre_attr_store(kobj, attr, value,
1708                                                    strlen(value));
1709                 }
1710         }
1711         return count;
1712 }
1713 EXPORT_SYMBOL(class_modify_config);
1714
1715 /*
1716  * Supplemental functions for config logs, it allocates lustre_cfg
1717  * buffers plus initialized llog record header at the beginning.
1718  */
1719 struct llog_cfg_rec *lustre_cfg_rec_new(int cmd, struct lustre_cfg_bufs *bufs)
1720 {
1721         struct llog_cfg_rec *lcr;
1722         int reclen;
1723
1724         ENTRY;
1725
1726         reclen = lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen);
1727         reclen = llog_data_len(reclen) + sizeof(struct llog_rec_hdr) +
1728                  sizeof(struct llog_rec_tail);
1729
1730         OBD_ALLOC(lcr, reclen);
1731         if (!lcr)
1732                 RETURN(NULL);
1733
1734         lustre_cfg_init(&lcr->lcr_cfg, cmd, bufs);
1735
1736         lcr->lcr_hdr.lrh_len = reclen;
1737         lcr->lcr_hdr.lrh_type = OBD_CFG_REC;
1738
1739         RETURN(lcr);
1740 }
1741 EXPORT_SYMBOL(lustre_cfg_rec_new);
1742
1743 void lustre_cfg_rec_free(struct llog_cfg_rec *lcr)
1744 {
1745         ENTRY;
1746         OBD_FREE(lcr, lcr->lcr_hdr.lrh_len);
1747         EXIT;
1748 }
1749 EXPORT_SYMBOL(lustre_cfg_rec_free);
1750
1751 /**
1752  * Parse a configuration llog, doing various manipulations on them
1753  * for various reasons, (modifications for compatibility, skip obsolete
1754  * records, change uuids, etc), then class_process_config() resulting
1755  * net records.
1756  */
1757 int class_config_llog_handler(const struct lu_env *env,
1758                               struct llog_handle *handle,
1759                               struct llog_rec_hdr *rec, void *data)
1760 {
1761         struct config_llog_instance *cfg = data;
1762         int cfg_len = rec->lrh_len;
1763         char *cfg_buf = (char *) (rec + 1);
1764         int rc = 0;
1765         ENTRY;
1766
1767         /* class_config_dump_handler(handle, rec, data); */
1768
1769         switch (rec->lrh_type) {
1770         case OBD_CFG_REC: {
1771                 struct lustre_cfg *lcfg, *lcfg_new;
1772                 struct lustre_cfg_bufs bufs;
1773                 char *inst_name = NULL;
1774                 int inst_len = 0;
1775                 int swab = 0;
1776
1777                 lcfg = (struct lustre_cfg *)cfg_buf;
1778                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1779                         lustre_swab_lustre_cfg(lcfg);
1780                         swab = 1;
1781                 }
1782
1783                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1784                 if (rc)
1785                         GOTO(out, rc);
1786
1787                 /* Figure out config state info */
1788                 if (lcfg->lcfg_command == LCFG_MARKER) {
1789                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1790                         lustre_swab_cfg_marker(marker, swab,
1791                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1792                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1793                                cfg->cfg_flags, marker->cm_flags);
1794                         if (marker->cm_flags & CM_START) {
1795                                 /* all previous flags off */
1796                                 cfg->cfg_flags = CFG_F_MARKER;
1797                                 server_name2index(marker->cm_tgtname,
1798                                                   &cfg->cfg_lwp_idx, NULL);
1799                                 if (marker->cm_flags & CM_SKIP) {
1800                                         cfg->cfg_flags |= CFG_F_SKIP;
1801                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1802                                                marker->cm_step);
1803                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1804                                            (cfg->cfg_sb &&
1805                                            lustre_check_exclusion(cfg->cfg_sb,
1806                                                         marker->cm_tgtname))) {
1807                                         cfg->cfg_flags |= CFG_F_EXCLUDE;
1808                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1809                                                marker->cm_step);
1810                                 }
1811                         } else if (marker->cm_flags & CM_END) {
1812                                 cfg->cfg_flags = 0;
1813                         }
1814                 }
1815                 /*
1816                  * A config command without a start marker before it is
1817                  * illegal
1818                  */
1819                 if (!(cfg->cfg_flags & CFG_F_MARKER) &&
1820                     (lcfg->lcfg_command != LCFG_MARKER)) {
1821                         CWARN("Skip config outside markers, (inst: %016lx, uuid: %s, flags: %#x)\n",
1822                                 cfg->cfg_instance,
1823                                 cfg->cfg_uuid.uuid, cfg->cfg_flags);
1824                         cfg->cfg_flags |= CFG_F_SKIP;
1825                 }
1826                 if (cfg->cfg_flags & CFG_F_SKIP) {
1827                         CDEBUG(D_CONFIG, "skipping %#x\n",
1828                                cfg->cfg_flags);
1829                         rc = 0;
1830                         /* No processing! */
1831                         break;
1832                 }
1833
1834                 /*
1835                  * For interoperability between 1.8 and 2.0,
1836                  * rename "mds" OBD device type to "mdt".
1837                  */
1838                 {
1839                         char *typename = lustre_cfg_string(lcfg, 1);
1840                         char *index = lustre_cfg_string(lcfg, 2);
1841
1842                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1843                             strcmp(typename, "mds") == 0)) {
1844                                 CWARN("For 1.8 interoperability, rename obd "
1845                                         "type from mds to mdt\n");
1846                                 typename[2] = 't';
1847                         }
1848                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1849                             strcmp(index, "type") == 0)) {
1850                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1851                                        "set this index to '0'\n");
1852                                 index[0] = '0';
1853                                 index[1] = 0;
1854                         }
1855                 }
1856
1857 #ifdef HAVE_SERVER_SUPPORT
1858                 /* newer MDS replaces LOV/OSC with LOD/OSP */
1859                 if ((lcfg->lcfg_command == LCFG_ATTACH ||
1860                      lcfg->lcfg_command == LCFG_SET_PARAM ||
1861                      lcfg->lcfg_command == LCFG_PARAM) &&
1862                     cfg->cfg_sb && IS_MDT(s2lsi(cfg->cfg_sb))) {
1863                         char *typename = lustre_cfg_string(lcfg, 1);
1864
1865                         if (typename &&
1866                             strcmp(typename, LUSTRE_LOV_NAME) == 0) {
1867                                 CDEBUG(D_CONFIG,
1868                                        "For 2.x interoperability, rename obd "
1869                                        "type from lov to lod (%s)\n",
1870                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1871                                 strcpy(typename, LUSTRE_LOD_NAME);
1872                         }
1873                         if (typename &&
1874                             strcmp(typename, LUSTRE_OSC_NAME) == 0) {
1875                                 CDEBUG(D_CONFIG,
1876                                        "For 2.x interoperability, rename obd "
1877                                        "type from osc to osp (%s)\n",
1878                                        s2lsi(cfg->cfg_sb)->lsi_svname);
1879                                 strcpy(typename, LUSTRE_OSP_NAME);
1880                         }
1881                 }
1882 #endif /* HAVE_SERVER_SUPPORT */
1883
1884                 if (cfg->cfg_flags & CFG_F_EXCLUDE) {
1885                         CDEBUG(D_CONFIG, "cmd: %x marked EXCLUDED\n",
1886                                lcfg->lcfg_command);
1887                         if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD)
1888                                 /* Add inactive instead */
1889                                 lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1890                 }
1891
1892                 lustre_cfg_bufs_reset(&bufs, NULL);
1893                 lustre_cfg_bufs_init(&bufs, lcfg);
1894
1895                 if (cfg->cfg_instance &&
1896                     lcfg->lcfg_command != LCFG_SPTLRPC_CONF &&
1897                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
1898                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1899                                 LUSTRE_MAXINSTANCE + 4;
1900                         OBD_ALLOC(inst_name, inst_len);
1901                         if (!inst_name)
1902                                 GOTO(out, rc = -ENOMEM);
1903                         snprintf(inst_name, inst_len, "%s-%016lx",
1904                                 lustre_cfg_string(lcfg, 0),
1905                                 cfg->cfg_instance);
1906                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1907                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1908                                lcfg->lcfg_command, inst_name);
1909                 }
1910
1911                 /* override llog UUID for clients, to insure they are unique */
1912                 if (cfg->cfg_instance && lcfg->lcfg_command == LCFG_ATTACH)
1913                         lustre_cfg_bufs_set_string(&bufs, 2,
1914                                                    cfg->cfg_uuid.uuid);
1915                 /*
1916                  * sptlrpc config record, we expect 2 data segments:
1917                  *  [0]: fs_name/target_name,
1918                  *  [1]: rule string
1919                  * moving them to index [1] and [2], and insert MGC's
1920                  * obdname at index [0].
1921                  */
1922                 if (cfg->cfg_instance &&
1923                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1924                         /* After ASLR changes cfg_instance this needs fixing */
1925                         /* "obd" is set in config_log_find_or_add() */
1926                         struct obd_device *obd = (void *)cfg->cfg_instance;
1927
1928                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1929                                             bufs.lcfg_buflen[1]);
1930                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1931                                             bufs.lcfg_buflen[0]);
1932                         lustre_cfg_bufs_set_string(&bufs, 0,
1933                                                    obd->obd_name);
1934                 }
1935
1936                 /*
1937                  * Add net info to setup command
1938                  * if given on command line.
1939                  * So config log will be:
1940                  * [0]: client name
1941                  * [1]: client UUID
1942                  * [2]: server UUID
1943                  * [3]: inactive-on-startup
1944                  * [4]: restrictive net
1945                  */
1946                 if (cfg && cfg->cfg_sb && s2lsi(cfg->cfg_sb) &&
1947                     !IS_SERVER(s2lsi(cfg->cfg_sb))) {
1948                         struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1949                         char *nidnet = lsi->lsi_lmd->lmd_nidnet;
1950
1951                         if (lcfg->lcfg_command == LCFG_SETUP &&
1952                             lcfg->lcfg_bufcount != 2 && nidnet) {
1953                                 CDEBUG(D_CONFIG, "Adding net %s info to setup "
1954                                        "command for client %s\n", nidnet,
1955                                        lustre_cfg_string(lcfg, 0));
1956                                 lustre_cfg_bufs_set_string(&bufs, 4, nidnet);
1957                         }
1958                 }
1959
1960                 OBD_ALLOC(lcfg_new, lustre_cfg_len(bufs.lcfg_bufcount,
1961                                                    bufs.lcfg_buflen));
1962                 if (!lcfg_new)
1963                         GOTO(out_inst, rc = -ENOMEM);
1964
1965                 lustre_cfg_init(lcfg_new, lcfg->lcfg_command, &bufs);
1966                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1967                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1968
1969                 /*
1970                  * XXX Hack to try to remain binary compatible with
1971                  * pre-newconfig logs
1972                  */
1973                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1974                     (lcfg->lcfg_nid >> 32) == 0) {
1975                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1976
1977                         lcfg_new->lcfg_nid =
1978                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1979                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
1980                               lcfg->lcfg_nal, addr,
1981                               libcfs_nid2str(lcfg_new->lcfg_nid));
1982                 } else {
1983                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
1984                 }
1985
1986                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
1987
1988                 rc = class_process_config(lcfg_new);
1989                 OBD_FREE(lcfg_new, lustre_cfg_len(lcfg_new->lcfg_bufcount,
1990                                                   lcfg_new->lcfg_buflens));
1991 out_inst:
1992                 if (inst_name)
1993                         OBD_FREE(inst_name, inst_len);
1994                 break;
1995         }
1996         default:
1997                 CERROR("Unknown llog record type %#x encountered\n",
1998                        rec->lrh_type);
1999                 break;
2000         }
2001 out:
2002         if (rc) {
2003                 CERROR("%s: cfg command failed: rc = %d\n",
2004                         handle->lgh_ctxt->loc_obd->obd_name, rc);
2005                 class_config_dump_handler(NULL, handle, rec, data);
2006         }
2007         RETURN(rc);
2008 }
2009 EXPORT_SYMBOL(class_config_llog_handler);
2010
2011 int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
2012                             char *name, struct config_llog_instance *cfg)
2013 {
2014         struct llog_process_cat_data cd = {
2015                 .lpcd_first_idx = 0,
2016                 .lpcd_read_mode = LLOG_READ_MODE_NORMAL,
2017         };
2018         struct llog_handle *llh;
2019         llog_cb_t callback;
2020         int rc;
2021         ENTRY;
2022
2023         CDEBUG(D_INFO, "looking up llog %s\n", name);
2024         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
2025         if (rc)
2026                 RETURN(rc);
2027
2028         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
2029         if (rc)
2030                 GOTO(parse_out, rc);
2031
2032         /* continue processing from where we last stopped to end-of-log */
2033         if (cfg) {
2034                 cd.lpcd_first_idx = cfg->cfg_last_idx;
2035                 callback = cfg->cfg_callback;
2036                 LASSERT(callback != NULL);
2037         } else {
2038                 callback = class_config_llog_handler;
2039         }
2040
2041         cd.lpcd_last_idx = 0;
2042
2043         rc = llog_process(env, llh, callback, cfg, &cd);
2044
2045         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
2046                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
2047         if (cfg)
2048                 cfg->cfg_last_idx = cd.lpcd_last_idx;
2049
2050 parse_out:
2051         llog_close(env, llh);
2052         RETURN(rc);
2053 }
2054 EXPORT_SYMBOL(class_config_parse_llog);
2055
2056 /**
2057  * Get marker cfg_flag
2058  */
2059 void llog_get_marker_cfg_flags(struct llog_rec_hdr *rec,
2060                                unsigned int *cfg_flags)
2061 {
2062         struct lustre_cfg *lcfg = (struct lustre_cfg *)(rec + 1);
2063         struct cfg_marker *marker;
2064
2065         if (lcfg->lcfg_command == LCFG_MARKER) {
2066                 marker = lustre_cfg_buf(lcfg, 1);
2067                 if (marker->cm_flags & CM_START) {
2068                         *cfg_flags = CFG_F_MARKER;
2069                         if (marker->cm_flags & CM_SKIP)
2070                                 *cfg_flags = CFG_F_SKIP;
2071                 } else if (marker->cm_flags & CM_END) {
2072                         *cfg_flags = 0;
2073                 }
2074                 CDEBUG(D_INFO, "index=%d, cm_flags=%#08x cfg_flags=%#08x\n",
2075                        rec->lrh_index, marker->cm_flags, *cfg_flags);
2076         }
2077 }
2078
2079 /**
2080  * Parse config record and output dump in supplied buffer.
2081  *
2082  * This is separated from class_config_dump_handler() to use
2083  * for ioctl needs as well
2084  *
2085  * Sample Output:
2086  * - { index: 4, event: attach, device: lustrewt-clilov, type: lov,
2087  *     UUID: lustrewt-clilov_UUID }
2088  */
2089 int class_config_yaml_output(struct llog_rec_hdr *rec, char *buf, int size,
2090                              unsigned int *cfg_flags, bool raw)
2091 {
2092         struct lustre_cfg *lcfg = (struct lustre_cfg *)(rec + 1);
2093         char *ptr = buf;
2094         char *end = buf + size;
2095         int rc = 0, i;
2096         struct lcfg_type_data *ldata;
2097         int swab = 0;
2098
2099         LASSERT(rec->lrh_type == OBD_CFG_REC);
2100
2101         if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
2102                 lustre_swab_lustre_cfg(lcfg);
2103                 swab = 1;
2104         }
2105
2106         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2107         if (rc < 0)
2108                 return rc;
2109
2110         ldata = lcfg_cmd2data(lcfg->lcfg_command);
2111         if (!ldata)
2112                 return -ENOTTY;
2113
2114         llog_get_marker_cfg_flags(rec, cfg_flags);
2115         if ((lcfg->lcfg_command == LCFG_MARKER) && likely(!raw))
2116                 return 0;
2117         /* entries outside marker are skipped */
2118         if (!(*cfg_flags & CFG_F_MARKER) && !raw)
2119                 return 0;
2120         /* inside skipped marker */
2121         if ((*cfg_flags & CFG_F_SKIP) && !raw)
2122                 return 0;
2123
2124         /* form YAML entity */
2125         ptr += snprintf(ptr, end - ptr, "- { index: %u, event: %s",
2126                         rec->lrh_index, ldata->ltd_name);
2127         if (end - ptr <= 0)
2128                 goto out_overflow;
2129
2130         if (lcfg->lcfg_flags) {
2131                 ptr += snprintf(ptr, end - ptr, ", flags: %#08x",
2132                                 lcfg->lcfg_flags);
2133                 if (end - ptr <= 0)
2134                         goto out_overflow;
2135         }
2136         if (lcfg->lcfg_num) {
2137                 ptr += snprintf(ptr, end - ptr, ", num: %#08x",
2138                                 lcfg->lcfg_num);
2139                 if (end - ptr <= 0)
2140                         goto out_overflow;
2141         }
2142         if (lcfg->lcfg_nid) {
2143                 char nidstr[LNET_NIDSTR_SIZE];
2144
2145                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2146                 ptr += snprintf(ptr, end - ptr, ", nid: %s(%#llx)",
2147                                 nidstr, lcfg->lcfg_nid);
2148                 if (end - ptr <= 0)
2149                         goto out_overflow;
2150         }
2151
2152         if (LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
2153                 ptr += snprintf(ptr, end - ptr, ", device: %s",
2154                                 lustre_cfg_string(lcfg, 0));
2155                 if (end - ptr <= 0)
2156                         goto out_overflow;
2157         }
2158
2159         if (lcfg->lcfg_command == LCFG_SET_PARAM) {
2160                 /*
2161                  * set_param -P parameters have param=val here, separate
2162                  * them through pointer magic and print them out in
2163                  * native yamlese
2164                  */
2165                 char *cfg_str = lustre_cfg_string(lcfg, 1);
2166                 char *tmp = strchr(cfg_str, '=');
2167                 size_t len;
2168
2169                 if (!tmp)
2170                         goto out_done;
2171
2172                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[0]);
2173                 len = tmp - cfg_str + 1;
2174                 snprintf(ptr, len, "%s", cfg_str);
2175                 ptr += len - 1;
2176
2177                 ptr += snprintf(ptr, end - ptr, ", %s: ", ldata->ltd_bufs[1]);
2178                 ptr += snprintf(ptr, end - ptr, "%s", tmp + 1);
2179
2180                 goto out_done;
2181         }
2182
2183         if (lcfg->lcfg_command == LCFG_MARKER) {
2184                 struct cfg_marker *marker;
2185
2186                 marker = lustre_cfg_buf(lcfg, 1);
2187                 ptr += snprintf(ptr, end - ptr, ", flags: %#04x",
2188                                 marker->cm_flags);
2189                 ptr += snprintf(ptr, end - ptr, ", version: %d.%d.%d.%d",
2190                                 OBD_OCD_VERSION_MAJOR(marker->cm_vers),
2191                                 OBD_OCD_VERSION_MINOR(marker->cm_vers),
2192                                 OBD_OCD_VERSION_PATCH(marker->cm_vers),
2193                                 OBD_OCD_VERSION_FIX(marker->cm_vers));
2194                 ptr += snprintf(ptr, end - ptr, ", createtime: %lld",
2195                                 marker->cm_createtime);
2196                 ptr += snprintf(ptr, end - ptr, ", canceltime: %lld",
2197                                 marker->cm_canceltime);
2198
2199                 goto out_done;
2200         }
2201
2202         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
2203                 if (LUSTRE_CFG_BUFLEN(lcfg, i) > 0) {
2204                         ptr += snprintf(ptr, end - ptr, ", %s: %s",
2205                                         ldata->ltd_bufs[i - 1],
2206                                         lustre_cfg_string(lcfg, i));
2207                         if (end - ptr <= 0)
2208                                 goto out_overflow;
2209                 }
2210         }
2211
2212 out_done:
2213         ptr += snprintf(ptr, end - ptr, " }\n");
2214 out_overflow:
2215         /* Return consumed bytes.  If the buffer overflowed, zero last byte */
2216         rc = ptr - buf;
2217         if (rc > size) {
2218                 rc = -EOVERFLOW;
2219                 *(end - 1) = '\0';
2220         }
2221
2222         return rc;
2223 }
2224
2225 /**
2226  * parse config record and output dump in supplied buffer.
2227  * This is separated from class_config_dump_handler() to use
2228  * for ioctl needs as well
2229  */
2230 static int class_config_parse_rec(struct llog_rec_hdr *rec, char *buf, int size)
2231 {
2232         struct lustre_cfg       *lcfg = (struct lustre_cfg *)(rec + 1);
2233         char                    *ptr = buf;
2234         char                    *end = buf + size;
2235         int                      rc = 0;
2236
2237         ENTRY;
2238
2239         LASSERT(rec->lrh_type == OBD_CFG_REC);
2240         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
2241         if (rc < 0)
2242                 RETURN(rc);
2243
2244         ptr += snprintf(ptr, end-ptr, "cmd=%05x ", lcfg->lcfg_command);
2245         if (lcfg->lcfg_flags)
2246                 ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
2247                                 lcfg->lcfg_flags);
2248
2249         if (lcfg->lcfg_num)
2250                 ptr += snprintf(ptr, end-ptr, "num=%#08x ", lcfg->lcfg_num);
2251
2252         if (lcfg->lcfg_nid) {
2253                 char nidstr[LNET_NIDSTR_SIZE];
2254
2255                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
2256                 ptr += snprintf(ptr, end-ptr, "nid=%s(%#llx)    ",
2257                                 nidstr, lcfg->lcfg_nid);
2258         }
2259
2260         if (lcfg->lcfg_command == LCFG_MARKER) {
2261                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
2262
2263                 ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
2264                                 marker->cm_step, marker->cm_flags,
2265                                 marker->cm_tgtname, marker->cm_comment);
2266         } else {
2267                 int i;
2268
2269                 for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
2270                         ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
2271                                         lustre_cfg_string(lcfg, i));
2272                 }
2273         }
2274         ptr += snprintf(ptr, end - ptr, "\n");
2275         /* return consumed bytes */
2276         rc = ptr - buf;
2277         RETURN(rc);
2278 }
2279
2280 int class_config_dump_handler(const struct lu_env *env,
2281                               struct llog_handle *handle,
2282                               struct llog_rec_hdr *rec, void *data)
2283 {
2284         char *outstr;
2285         int rc = 0;
2286
2287         ENTRY;
2288
2289         OBD_ALLOC(outstr, 256);
2290         if (!outstr)
2291                 RETURN(-ENOMEM);
2292
2293         if (rec->lrh_type == OBD_CFG_REC) {
2294                 class_config_parse_rec(rec, outstr, 256);
2295                 LCONSOLE(D_WARNING, "   %s\n", outstr);
2296         } else {
2297                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
2298                 rc = -EINVAL;
2299         }
2300
2301         OBD_FREE(outstr, 256);
2302         RETURN(rc);
2303 }
2304
2305 /**
2306  * Call class_cleanup and class_detach.
2307  * "Manual" only in the sense that we're faking lcfg commands.
2308  */
2309 int class_manual_cleanup(struct obd_device *obd)
2310 {
2311         char flags[3] = "";
2312         struct lustre_cfg *lcfg;
2313         struct lustre_cfg_bufs bufs;
2314         int rc;
2315
2316         ENTRY;
2317
2318         if (!obd) {
2319                 CERROR("empty cleanup\n");
2320                 RETURN(-EALREADY);
2321         }
2322
2323         if (obd->obd_force)
2324                 strlcat(flags, "F", sizeof(flags));
2325         if (obd->obd_fail)
2326                 strlcat(flags, "A", sizeof(flags));
2327
2328         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
2329                obd->obd_name, flags);
2330
2331         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
2332         lustre_cfg_bufs_set_string(&bufs, 1, flags);
2333         OBD_ALLOC(lcfg, lustre_cfg_len(bufs.lcfg_bufcount, bufs.lcfg_buflen));
2334         if (!lcfg)
2335                 RETURN(-ENOMEM);
2336         lustre_cfg_init(lcfg, LCFG_CLEANUP, &bufs);
2337
2338         rc = class_process_config(lcfg);
2339         if (rc) {
2340                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
2341                 GOTO(out, rc);
2342         }
2343
2344         /* the lcfg is almost the same for both ops */
2345         lcfg->lcfg_command = LCFG_DETACH;
2346         rc = class_process_config(lcfg);
2347         if (rc)
2348                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
2349 out:
2350         OBD_FREE(lcfg, lustre_cfg_len(lcfg->lcfg_bufcount, lcfg->lcfg_buflens));
2351         RETURN(rc);
2352 }
2353 EXPORT_SYMBOL(class_manual_cleanup);
2354
2355 #ifdef HAVE_SERVER_SUPPORT
2356 /*
2357  * nid<->nidstats hash operations
2358  */
2359 static unsigned
2360 nidstats_hash(struct cfs_hash *hs, const void *key, unsigned int mask)
2361 {
2362         return cfs_hash_djb2_hash(key, sizeof(struct lnet_nid), mask);
2363 }
2364
2365 static void *
2366 nidstats_key(struct hlist_node *hnode)
2367 {
2368         struct nid_stat *ns;
2369
2370         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2371
2372         return &ns->nid;
2373 }
2374
2375 static int
2376 nidstats_keycmp(const void *key, struct hlist_node *hnode)
2377 {
2378         return nid_same((struct lnet_nid *)nidstats_key(hnode),
2379                          (struct lnet_nid *)key);
2380 }
2381
2382 static void *
2383 nidstats_object(struct hlist_node *hnode)
2384 {
2385         return hlist_entry(hnode, struct nid_stat, nid_hash);
2386 }
2387
2388 static void
2389 nidstats_get(struct cfs_hash *hs, struct hlist_node *hnode)
2390 {
2391         struct nid_stat *ns;
2392
2393         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2394         nidstat_getref(ns);
2395 }
2396
2397 static void
2398 nidstats_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2399 {
2400         struct nid_stat *ns;
2401
2402         ns = hlist_entry(hnode, struct nid_stat, nid_hash);
2403         nidstat_putref(ns);
2404 }
2405
2406 static struct cfs_hash_ops nid_stat_hash_ops = {
2407         .hs_hash        = nidstats_hash,
2408         .hs_key         = nidstats_key,
2409         .hs_keycmp      = nidstats_keycmp,
2410         .hs_object      = nidstats_object,
2411         .hs_get         = nidstats_get,
2412         .hs_put_locked  = nidstats_put_locked,
2413 };
2414
2415 /*
2416  * client_generation<->export hash operations
2417  */
2418
2419 static unsigned
2420 gen_hash(struct cfs_hash *hs, const void *key, unsigned mask)
2421 {
2422         return cfs_hash_djb2_hash(key, sizeof(__u32), mask);
2423 }
2424
2425 static void *
2426 gen_key(struct hlist_node *hnode)
2427 {
2428         struct obd_export *exp;
2429
2430         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2431
2432         RETURN(&exp->exp_target_data.ted_lcd->lcd_generation);
2433 }
2434
2435 /*
2436  * NOTE: It is impossible to find an export that is in failed
2437  *       state with this function
2438  */
2439 static int
2440 gen_kepcmp(const void *key, struct hlist_node *hnode)
2441 {
2442         struct obd_export *exp;
2443
2444         LASSERT(key);
2445         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2446
2447         RETURN(exp->exp_target_data.ted_lcd->lcd_generation == *(__u32 *)key &&
2448                !exp->exp_failed);
2449 }
2450
2451 static void *
2452 gen_export_object(struct hlist_node *hnode)
2453 {
2454         return hlist_entry(hnode, struct obd_export, exp_gen_hash);
2455 }
2456
2457 static void
2458 gen_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
2459 {
2460         struct obd_export *exp;
2461
2462         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2463         class_export_get(exp);
2464 }
2465
2466 static void
2467 gen_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
2468 {
2469         struct obd_export *exp;
2470
2471         exp = hlist_entry(hnode, struct obd_export, exp_gen_hash);
2472         class_export_put(exp);
2473 }
2474
2475 static struct cfs_hash_ops gen_hash_ops = {
2476         .hs_hash        = gen_hash,
2477         .hs_key         = gen_key,
2478         .hs_keycmp      = gen_kepcmp,
2479         .hs_object      = gen_export_object,
2480         .hs_get         = gen_export_get,
2481         .hs_put_locked  = gen_export_put_locked,
2482 };
2483
2484 #endif /* HAVE_SERVER_SUPPORT */