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