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