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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/obdclass/obd_config.c
  37  *
  38  * Config API
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_CLASS
  42 #ifdef __KERNEL__
  43 #include <obd_class.h>
  44 #include <linux/string.h>
  45 #else
  46 #include <liblustre.h>
  47 #include <string.h>
  48 #include <obd_class.h>
  49 #include <obd.h>
  50 #endif
  51 #include <lustre_log.h>
  52 #include <lprocfs_status.h>
  53 #include <lustre_param.h>
  54
  55 #include "llog_internal.h"
  56
  57 static cfs_hash_ops_t uuid_hash_ops;
  58 static cfs_hash_ops_t nid_hash_ops;
  59 static cfs_hash_ops_t nid_stat_hash_ops;
  60
  61 /*********** string parsing utils *********/
  62
  63 /* returns 0 if we find this key in the buffer, else 1 */
  64 int class_find_param(char *buf, char *key, char **valp)
  65 {
  66         char *ptr;
  67
  68         if (!buf)
  69                 return 1;
  70
  71         if ((ptr = strstr(buf, key)) == NULL)
  72                 return 1;
  73
  74         if (valp)
  75                 *valp = ptr + strlen(key);
  76
  77         return 0;
  78 }
  79 EXPORT_SYMBOL(class_find_param);
  80
  81 /**
  82  * Check whether the proc parameter \a param is an old parameter or not from
  83  * the array \a ptr which contains the mapping from old parameters to new ones.
  84  * If it's an old one, then return the pointer to the cfg_interop_param struc-
  85  * ture which contains both the old and new parameters.
  86  *
  87  * \param param                 proc parameter
  88  * \param ptr                   an array which contains the mapping from
  89  *                              old parameters to new ones
  90  *
  91  * \retval valid-pointer        pointer to the cfg_interop_param structure
  92  *                              which contains the old and new parameters
  93  * \retval NULL                 \a param or \a ptr is NULL,
  94  *                              or \a param is not an old parameter
  95  */
  96 struct cfg_interop_param *class_find_old_param(const char *param,
  97                                                struct cfg_interop_param *ptr)
  98 {
  99         char *value = NULL;
 100         int   name_len = 0;
 101
 102         if (param == NULL || ptr == NULL)
 103                 RETURN(NULL);
 104
 105         value = strchr(param, '=');
 106         if (value == NULL)
 107                 name_len = strlen(param);
 108         else
 109                 name_len = value - param;
 110
 111         while (ptr->old_param != NULL) {
 112                 if (strncmp(param, ptr->old_param, name_len) == 0 &&
 113                     name_len == strlen(ptr->old_param))
 114                         RETURN(ptr);
 115                 ptr++;
 116         }
 117
 118         RETURN(NULL);
 119 }
 120 EXPORT_SYMBOL(class_find_old_param);
 121
 122 /**
 123  * Finds a parameter in \a params and copies it to \a copy.
 124  *
 125  * Leading spaces are skipped. Next space or end of string is the
 126  * parameter terminator with the exception that spaces inside single or double
 127  * quotes get included into a parameter. The parameter is copied into \a copy
 128  * which has to be allocated big enough by a caller, quotes are stripped in
 129  * the copy and the copy is terminated by 0.
 130  *
 131  * On return \a params is set to next parameter or to NULL if last
 132  * parameter is returned.
 133  *
 134  * \retval 0 if parameter is returned in \a copy
 135  * \retval 1 otherwise
 136  * \retval -EINVAL if unbalanced quota is found
 137  */
 138 int class_get_next_param(char **params, char *copy)
 139 {
 140         char *q1, *q2, *str;
 141         int len;
 142
 143         str = *params;
 144         while (*str == ' ')
 145                 str++;
 146
 147         if (*str == '\0') {
 148                 *params = NULL;
 149                 return 1;
 150         }
 151
 152         while (1) {
 153                 q1 = strpbrk(str, " '\"");
 154                 if (q1 == NULL) {
 155                         len = strlen(str);
 156                         memcpy(copy, str, len);
 157                         copy[len] = '\0';
 158                         *params = NULL;
 159                         return 0;
 160                 }
 161                 len = q1 - str;
 162                 if (*q1 == ' ') {
 163                         memcpy(copy, str, len);
 164                         copy[len] = '\0';
 165                         *params = str + len;
 166                         return 0;
 167                 }
 168
 169                 memcpy(copy, str, len);
 170                 copy += len;
 171
 172                 /* search for the matching closing quote */
 173                 str = q1 + 1;
 174                 q2 = strchr(str, *q1);
 175                 if (q2 == NULL) {
 176                         CERROR("Unbalanced quota in parameters: \"%s\"\n",
 177                                *params);
 178                         return -EINVAL;
 179                 }
 180                 len = q2 - str;
 181                 memcpy(copy, str, len);
 182                 copy += len;
 183                 str = q2 + 1;
 184         }
 185         return 1;
 186 }
 187 EXPORT_SYMBOL(class_get_next_param);
 188
 189 /* returns 0 if this is the first key in the buffer, else 1.
 190    valp points to first char after key. */
 191 int class_match_param(char *buf, char *key, char **valp)
 192 {
 193         if (!buf)
 194                 return 1;
 195
 196         if (memcmp(buf, key, strlen(key)) != 0)
 197                 return 1;
 198
 199         if (valp)
 200                 *valp = buf + strlen(key);
 201
 202         return 0;
 203 }
 204 EXPORT_SYMBOL(class_match_param);
 205
 206 static int parse_nid(char *buf, void *value, int quiet)
 207 {
 208         lnet_nid_t *nid = (lnet_nid_t *)value;
 209
 210         *nid = libcfs_str2nid(buf);
 211         if (*nid != LNET_NID_ANY)
 212                 return 0;
 213
 214         if (!quiet)
 215                 LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
 216         return -EINVAL;
 217 }
 218
 219 static int parse_net(char *buf, void *value)
 220 {
 221         __u32 *net = (__u32 *)value;
 222
 223         *net = libcfs_str2net(buf);
 224         CDEBUG(D_INFO, "Net %s\n", libcfs_net2str(*net));
 225         return 0;
 226 }
 227
 228 enum {
 229         CLASS_PARSE_NID = 1,
 230         CLASS_PARSE_NET,
 231 };
 232
 233 /* 0 is good nid,
 234    1 not found
 235    < 0 error
 236    endh is set to next separator */
 237 static int class_parse_value(char *buf, int opc, void *value, char **endh,
 238                              int quiet)
 239 {
 240         char *endp;
 241         char  tmp;
 242         int   rc = 0;
 243
 244         if (!buf)
 245                 return 1;
 246         while (*buf == ',' || *buf == ':')
 247                 buf++;
 248         if (*buf == ' ' || *buf == '/' || *buf == '\0')
 249                 return 1;
 250
 251         /* nid separators or end of nids */
 252         endp = strpbrk(buf, ",: /");
 253         if (endp == NULL)
 254                 endp = buf + strlen(buf);
 255
 256         tmp = *endp;
 257         *endp = '\0';
 258         switch (opc) {
 259         default:
 260                 LBUG();
 261         case CLASS_PARSE_NID:
 262                 rc = parse_nid(buf, value, quiet);
 263                 break;
 264         case CLASS_PARSE_NET:
 265                 rc = parse_net(buf, value);
 266                 break;
 267         }
 268         *endp = tmp;
 269         if (rc != 0)
 270                 return rc;
 271         if (endh)
 272                 *endh = endp;
 273         return 0;
 274 }
 275
 276 int class_parse_nid(char *buf, lnet_nid_t *nid, char **endh)
 277 {
 278         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 0);
 279 }
 280 EXPORT_SYMBOL(class_parse_nid);
 281
 282 int class_parse_nid_quiet(char *buf, lnet_nid_t *nid, char **endh)
 283 {
 284         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 1);
 285 }
 286 EXPORT_SYMBOL(class_parse_nid_quiet);
 287
 288 int class_parse_net(char *buf, __u32 *net, char **endh)
 289 {
 290         return class_parse_value(buf, CLASS_PARSE_NET, (void *)net, endh, 0);
 291 }
 292 EXPORT_SYMBOL(class_parse_net);
 293
 294 /* 1 param contains key and match
 295  * 0 param contains key and not match
 296  * -1 param does not contain key
 297  */
 298 int class_match_nid(char *buf, char *key, lnet_nid_t nid)
 299 {
 300         lnet_nid_t tmp;
 301         int   rc = -1;
 302
 303         while (class_find_param(buf, key, &buf) == 0) {
 304                 /* please restrict to the nids pertaining to
 305                  * the specified nids */
 306                 while (class_parse_nid(buf, &tmp, &buf) == 0) {
 307                         if (tmp == nid)
 308                                 return 1;
 309                 }
 310                 rc = 0;
 311         }
 312         return rc;
 313 }
 314 EXPORT_SYMBOL(class_match_nid);
 315
 316 int class_match_net(char *buf, char *key, __u32 net)
 317 {
 318         __u32 tmp;
 319         int   rc = -1;
 320
 321         while (class_find_param(buf, key, &buf) == 0) {
 322                 /* please restrict to the nids pertaining to
 323                  * the specified networks */
 324                 while (class_parse_net(buf, &tmp, &buf) == 0) {
 325                         if (tmp == net)
 326                                 return 1;
 327                 }
 328                 rc = 0;
 329         }
 330         return rc;
 331 }
 332 EXPORT_SYMBOL(class_match_net);
 333
 334 /********************** class fns **********************/
 335
 336 /**
 337  * Create a new obd device and set the type, name and uuid.  If successful,
 338  * the new device can be accessed by either name or uuid.
 339  */
 340 int class_attach(struct lustre_cfg *lcfg)
 341 {
 342         struct obd_device *obd = NULL;
 343         char *typename, *name, *uuid;
 344         int rc, len;
 345         ENTRY;
 346
 347         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 348                 CERROR("No type passed!\n");
 349                 RETURN(-EINVAL);
 350         }
 351         typename = lustre_cfg_string(lcfg, 1);
 352
 353         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 354                 CERROR("No name passed!\n");
 355                 RETURN(-EINVAL);
 356         }
 357         name = lustre_cfg_string(lcfg, 0);
 358
 359         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 360                 CERROR("No UUID passed!\n");
 361                 RETURN(-EINVAL);
 362         }
 363         uuid = lustre_cfg_string(lcfg, 2);
 364
 365         CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 366                MKSTR(typename), MKSTR(name), MKSTR(uuid));
 367
 368         obd = class_newdev(typename, name);
 369         if (IS_ERR(obd)) {
 370                 /* Already exists or out of obds */
 371                 rc = PTR_ERR(obd);
 372                 obd = NULL;
 373                 CERROR("Cannot create device %s of type %s : %d\n",
 374                        name, typename, rc);
 375                 GOTO(out, rc);
 376         }
 377         LASSERTF(obd != NULL, "Cannot get obd device %s of type %s\n",
 378                  name, typename);
 379         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 380                  "obd %p obd_magic %08X != %08X\n",
 381                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 382         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 383                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 384
 385         rwlock_init(&obd->obd_pool_lock);
 386         obd->obd_pool_limit = 0;
 387         obd->obd_pool_slv = 0;
 388
 389         CFS_INIT_LIST_HEAD(&obd->obd_exports);
 390         CFS_INIT_LIST_HEAD(&obd->obd_unlinked_exports);
 391         CFS_INIT_LIST_HEAD(&obd->obd_delayed_exports);
 392         CFS_INIT_LIST_HEAD(&obd->obd_exports_timed);
 393         CFS_INIT_LIST_HEAD(&obd->obd_nid_stats);
 394         spin_lock_init(&obd->obd_nid_lock);
 395         spin_lock_init(&obd->obd_dev_lock);
 396         mutex_init(&obd->obd_dev_mutex);
 397         spin_lock_init(&obd->obd_osfs_lock);
 398         /* obd->obd_osfs_age must be set to a value in the distant
 399          * past to guarantee a fresh statfs is fetched on mount. */
 400         obd->obd_osfs_age = cfs_time_shift_64(-1000);
 401
 402         /* XXX belongs in setup not attach  */
 403         init_rwsem(&obd->obd_observer_link_sem);
 404         /* recovery data */
 405         cfs_init_timer(&obd->obd_recovery_timer);
 406         spin_lock_init(&obd->obd_recovery_task_lock);
 407         cfs_waitq_init(&obd->obd_next_transno_waitq);
 408         cfs_waitq_init(&obd->obd_evict_inprogress_waitq);
 409         CFS_INIT_LIST_HEAD(&obd->obd_req_replay_queue);
 410         CFS_INIT_LIST_HEAD(&obd->obd_lock_replay_queue);
 411         CFS_INIT_LIST_HEAD(&obd->obd_final_req_queue);
 412         CFS_INIT_LIST_HEAD(&obd->obd_evict_list);
 413
 414         llog_group_init(&obd->obd_olg, FID_SEQ_LLOG);
 415
 416         obd->obd_conn_inprogress = 0;
 417
 418         len = strlen(uuid);
 419         if (len >= sizeof(obd->obd_uuid)) {
 420                 CERROR("uuid must be < %d bytes long\n",
 421                        (int)sizeof(obd->obd_uuid));
 422                 GOTO(out, rc = -EINVAL);
 423         }
 424         memcpy(obd->obd_uuid.uuid, uuid, len);
 425
 426         /* do the attach */
 427         if (OBP(obd, attach)) {
 428                 rc = OBP(obd,attach)(obd, sizeof *lcfg, lcfg);
 429                 if (rc)
 430                         GOTO(out, rc = -EINVAL);
 431         }
 432
 433         /* Detach drops this */
 434         spin_lock(&obd->obd_dev_lock);
 435         cfs_atomic_set(&obd->obd_refcount, 1);
 436         spin_unlock(&obd->obd_dev_lock);
 437         lu_ref_init(&obd->obd_reference);
 438         lu_ref_add(&obd->obd_reference, "attach", obd);
 439
 440         obd->obd_attached = 1;
 441         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 442                obd->obd_minor, typename, cfs_atomic_read(&obd->obd_refcount));
 443         RETURN(0);
 444  out:
 445         if (obd != NULL) {
 446                 class_release_dev(obd);
 447         }
 448         return rc;
 449 }
 450 EXPORT_SYMBOL(class_attach);
 451
 452 /** Create hashes, self-export, and call type-specific setup.
 453  * Setup is effectively the "start this obd" call.
 454  */
 455 int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 456 {
 457         int err = 0;
 458         struct obd_export *exp;
 459         ENTRY;
 460
 461         LASSERT(obd != NULL);
 462         LASSERTF(obd == class_num2obd(obd->obd_minor),
 463                  "obd %p != obd_devs[%d] %p\n",
 464                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 465         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 466                  "obd %p obd_magic %08x != %08x\n",
 467                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 468
 469         /* have we attached a type to this device? */
 470         if (!obd->obd_attached) {
 471                 CERROR("Device %d not attached\n", obd->obd_minor);
 472                 RETURN(-ENODEV);
 473         }
 474
 475         if (obd->obd_set_up) {
 476                 CERROR("Device %d already setup (type %s)\n",
 477                        obd->obd_minor, obd->obd_type->typ_name);
 478                 RETURN(-EEXIST);
 479         }
 480
 481         /* is someone else setting us up right now? (attach inits spinlock) */
 482         spin_lock(&obd->obd_dev_lock);
 483         if (obd->obd_starting) {
 484                 spin_unlock(&obd->obd_dev_lock);
 485                 CERROR("Device %d setup in progress (type %s)\n",
 486                        obd->obd_minor, obd->obd_type->typ_name);
 487                 RETURN(-EEXIST);
 488         }
 489         /* just leave this on forever.  I can't use obd_set_up here because
 490            other fns check that status, and we're not actually set up yet. */
 491         obd->obd_starting = 1;
 492         obd->obd_uuid_hash = NULL;
 493         obd->obd_nid_hash = NULL;
 494         obd->obd_nid_stats_hash = NULL;
 495         spin_unlock(&obd->obd_dev_lock);
 496
 497         /* create an uuid-export lustre hash */
 498         obd->obd_uuid_hash = cfs_hash_create("UUID_HASH",
 499                                              HASH_UUID_CUR_BITS,
 500                                              HASH_UUID_MAX_BITS,
 501                                              HASH_UUID_BKT_BITS, 0,
 502                                              CFS_HASH_MIN_THETA,
 503                                              CFS_HASH_MAX_THETA,
 504                                              &uuid_hash_ops, CFS_HASH_DEFAULT);
 505         if (!obd->obd_uuid_hash)
 506                 GOTO(err_hash, err = -ENOMEM);
 507
 508         /* create a nid-export lustre hash */
 509         obd->obd_nid_hash = cfs_hash_create("NID_HASH",
 510                                             HASH_NID_CUR_BITS,
 511                                             HASH_NID_MAX_BITS,
 512                                             HASH_NID_BKT_BITS, 0,
 513                                             CFS_HASH_MIN_THETA,
 514                                             CFS_HASH_MAX_THETA,
 515                                             &nid_hash_ops, CFS_HASH_DEFAULT);
 516         if (!obd->obd_nid_hash)
 517                 GOTO(err_hash, err = -ENOMEM);
 518
 519         /* create a nid-stats lustre hash */
 520         obd->obd_nid_stats_hash = cfs_hash_create("NID_STATS",
 521                                                   HASH_NID_STATS_CUR_BITS,
 522                                                   HASH_NID_STATS_MAX_BITS,
 523                                                   HASH_NID_STATS_BKT_BITS, 0,
 524                                                   CFS_HASH_MIN_THETA,
 525                                                   CFS_HASH_MAX_THETA,
 526                                                   &nid_stat_hash_ops, CFS_HASH_DEFAULT);
 527         if (!obd->obd_nid_stats_hash)
 528                 GOTO(err_hash, err = -ENOMEM);
 529
 530         exp = class_new_export(obd, &obd->obd_uuid);
 531         if (IS_ERR(exp))
 532                 GOTO(err_hash, err = PTR_ERR(exp));
 533
 534         obd->obd_self_export = exp;
 535         cfs_list_del_init(&exp->exp_obd_chain_timed);
 536         class_export_put(exp);
 537
 538         err = obd_setup(obd, lcfg);
 539         if (err)
 540                 GOTO(err_exp, err);
 541
 542         obd->obd_set_up = 1;
 543
 544         spin_lock(&obd->obd_dev_lock);
 545         /* cleanup drops this */
 546         class_incref(obd, "setup", obd);
 547         spin_unlock(&obd->obd_dev_lock);
 548
 549         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 550                obd->obd_name, obd->obd_uuid.uuid);
 551
 552         RETURN(0);
 553 err_exp:
 554         if (obd->obd_self_export) {
 555                 class_unlink_export(obd->obd_self_export);
 556                 obd->obd_self_export = NULL;
 557         }
 558 err_hash:
 559         if (obd->obd_uuid_hash) {
 560                 cfs_hash_putref(obd->obd_uuid_hash);
 561                 obd->obd_uuid_hash = NULL;
 562         }
 563         if (obd->obd_nid_hash) {
 564                 cfs_hash_putref(obd->obd_nid_hash);
 565                 obd->obd_nid_hash = NULL;
 566         }
 567         if (obd->obd_nid_stats_hash) {
 568                 cfs_hash_putref(obd->obd_nid_stats_hash);
 569                 obd->obd_nid_stats_hash = NULL;
 570         }
 571         obd->obd_starting = 0;
 572         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 573         return err;
 574 }
 575 EXPORT_SYMBOL(class_setup);
 576
 577 /** We have finished using this obd and are ready to destroy it.
 578  * There can be no more references to this obd.
 579  */
 580 int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 581 {
 582         ENTRY;
 583
 584         if (obd->obd_set_up) {
 585                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 586                 RETURN(-EBUSY);
 587         }
 588
 589         spin_lock(&obd->obd_dev_lock);
 590         if (!obd->obd_attached) {
 591                 spin_unlock(&obd->obd_dev_lock);
 592                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 593                 RETURN(-ENODEV);
 594         }
 595         obd->obd_attached = 0;
 596         spin_unlock(&obd->obd_dev_lock);
 597
 598         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 599                obd->obd_name, obd->obd_uuid.uuid);
 600
 601         class_decref(obd, "attach", obd);
 602         RETURN(0);
 603 }
 604 EXPORT_SYMBOL(class_detach);
 605
 606 /** Start shutting down the obd.  There may be in-progess ops when
 607  * this is called.  We tell them to start shutting down with a call
 608  * to class_disconnect_exports().
 609  */
 610 int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 611 {
 612         int err = 0;
 613         char *flag;
 614         ENTRY;
 615
 616         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 617
 618         if (!obd->obd_set_up) {
 619                 CERROR("Device %d not setup\n", obd->obd_minor);
 620                 RETURN(-ENODEV);
 621         }
 622
 623         spin_lock(&obd->obd_dev_lock);
 624         if (obd->obd_stopping) {
 625                 spin_unlock(&obd->obd_dev_lock);
 626                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 627                 RETURN(-ENODEV);
 628         }
 629         /* Leave this on forever */
 630         obd->obd_stopping = 1;
 631
 632         /* wait for already-arrived-connections to finish. */
 633         while (obd->obd_conn_inprogress > 0) {
 634                 spin_unlock(&obd->obd_dev_lock);
 635
 636                 cfs_cond_resched();
 637
 638                 spin_lock(&obd->obd_dev_lock);
 639         }
 640         spin_unlock(&obd->obd_dev_lock);
 641
 642         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 643                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 644                         switch (*flag) {
 645                         case 'F':
 646                                 obd->obd_force = 1;
 647                                 break;
 648                         case 'A':
 649                                 LCONSOLE_WARN("Failing over %s\n",
 650                                               obd->obd_name);
 651                                 obd->obd_fail = 1;
 652                                 obd->obd_no_transno = 1;
 653                                 obd->obd_no_recov = 1;
 654                                 if (OBP(obd, iocontrol)) {
 655                                         obd_iocontrol(OBD_IOC_SYNC,
 656                                                       obd->obd_self_export,
 657                                                       0, NULL, NULL);
 658                                 }
 659                                 break;
 660                         default:
 661                                 CERROR("Unrecognised flag '%c'\n", *flag);
 662                         }
 663         }
 664
 665         LASSERT(obd->obd_self_export);
 666
 667         /* The three references that should be remaining are the
 668          * obd_self_export and the attach and setup references. */
 669         if (cfs_atomic_read(&obd->obd_refcount) > 3) {
 670                 /* refcounf - 3 might be the number of real exports
 671                    (excluding self export). But class_incref is called
 672                    by other things as well, so don't count on it. */
 673                 CDEBUG(D_IOCTL, "%s: forcing exports to disconnect: %d\n",
 674                        obd->obd_name, cfs_atomic_read(&obd->obd_refcount) - 3);
 675                 dump_exports(obd, 0);
 676                 class_disconnect_exports(obd);
 677         }
 678
 679         /* Precleanup, we must make sure all exports get destroyed. */
 680         err = obd_precleanup(obd, OBD_CLEANUP_EXPORTS);
 681         if (err)
 682                 CERROR("Precleanup %s returned %d\n",
 683                        obd->obd_name, err);
 684
 685         /* destroy an uuid-export hash body */
 686         if (obd->obd_uuid_hash) {
 687                 cfs_hash_putref(obd->obd_uuid_hash);
 688                 obd->obd_uuid_hash = NULL;
 689         }
 690
 691         /* destroy a nid-export hash body */
 692         if (obd->obd_nid_hash) {
 693                 cfs_hash_putref(obd->obd_nid_hash);
 694                 obd->obd_nid_hash = NULL;
 695         }
 696
 697         /* destroy a nid-stats hash body */
 698         if (obd->obd_nid_stats_hash) {
 699                 cfs_hash_putref(obd->obd_nid_stats_hash);
 700                 obd->obd_nid_stats_hash = NULL;
 701         }
 702
 703         class_decref(obd, "setup", obd);
 704         obd->obd_set_up = 0;
 705
 706         RETURN(0);
 707 }
 708 EXPORT_SYMBOL(class_cleanup);
 709
 710 struct obd_device *class_incref(struct obd_device *obd,
 711                                 const char *scope, const void *source)
 712 {
 713         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 714         cfs_atomic_inc(&obd->obd_refcount);
 715         CDEBUG(D_INFO, "incref %s (%p) now %d\n", obd->obd_name, obd,
 716                cfs_atomic_read(&obd->obd_refcount));
 717
 718         return obd;
 719 }
 720 EXPORT_SYMBOL(class_incref);
 721
 722 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 723 {
 724         int err;
 725         int refs;
 726
 727         spin_lock(&obd->obd_dev_lock);
 728         cfs_atomic_dec(&obd->obd_refcount);
 729         refs = cfs_atomic_read(&obd->obd_refcount);
 730         spin_unlock(&obd->obd_dev_lock);
 731         lu_ref_del(&obd->obd_reference, scope, source);
 732
 733         CDEBUG(D_INFO, "Decref %s (%p) now %d\n", obd->obd_name, obd, refs);
 734
 735         if ((refs == 1) && obd->obd_stopping) {
 736                 /* All exports have been destroyed; there should
 737                    be no more in-progress ops by this point.*/
 738
 739                 spin_lock(&obd->obd_self_export->exp_lock);
 740                 obd->obd_self_export->exp_flags |= exp_flags_from_obd(obd);
 741                 spin_unlock(&obd->obd_self_export->exp_lock);
 742
 743                 /* note that we'll recurse into class_decref again */
 744                 class_unlink_export(obd->obd_self_export);
 745                 return;
 746         }
 747
 748         if (refs == 0) {
 749                 CDEBUG(D_CONFIG, "finishing cleanup of obd %s (%s)\n",
 750                        obd->obd_name, obd->obd_uuid.uuid);
 751                 LASSERT(!obd->obd_attached);
 752                 if (obd->obd_stopping) {
 753                         /* If we're not stopping, we were never set up */
 754                         err = obd_cleanup(obd);
 755                         if (err)
 756                                 CERROR("Cleanup %s returned %d\n",
 757                                        obd->obd_name, err);
 758                 }
 759                 if (OBP(obd, detach)) {
 760                         err = OBP(obd, detach)(obd);
 761                         if (err)
 762                                 CERROR("Detach returned %d\n", err);
 763                 }
 764                 class_release_dev(obd);
 765         }
 766 }
 767 EXPORT_SYMBOL(class_decref);
 768
 769 /** Add a failover nid location.
 770  * Client obd types contact server obd types using this nid list.
 771  */
 772 int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 773 {
 774         struct obd_import *imp;
 775         struct obd_uuid uuid;
 776         int rc;
 777         ENTRY;
 778
 779         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 780             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 781                 CERROR("invalid conn_uuid\n");
 782                 RETURN(-EINVAL);
 783         }
 784         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 785             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
 786             strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) &&
 787             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
 788                 CERROR("can't add connection on non-client dev\n");
 789                 RETURN(-EINVAL);
 790         }
 791
 792         imp = obd->u.cli.cl_import;
 793         if (!imp) {
 794                 CERROR("try to add conn on immature client dev\n");
 795                 RETURN(-EINVAL);
 796         }
 797
 798         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 799         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
 800
 801         RETURN(rc);
 802 }
 803 EXPORT_SYMBOL(class_add_conn);
 804
 805 /** Remove a failover nid location.
 806  */
 807 int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 808 {
 809         struct obd_import *imp;
 810         struct obd_uuid uuid;
 811         int rc;
 812         ENTRY;
 813
 814         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 815             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 816                 CERROR("invalid conn_uuid\n");
 817                 RETURN(-EINVAL);
 818         }
 819         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 820             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 821                 CERROR("can't del connection on non-client dev\n");
 822                 RETURN(-EINVAL);
 823         }
 824
 825         imp = obd->u.cli.cl_import;
 826         if (!imp) {
 827                 CERROR("try to del conn on immature client dev\n");
 828                 RETURN(-EINVAL);
 829         }
 830
 831         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 832         rc = obd_del_conn(imp, &uuid);
 833
 834         RETURN(rc);
 835 }
 836
 837 CFS_LIST_HEAD(lustre_profile_list);
 838
 839 struct lustre_profile *class_get_profile(const char * prof)
 840 {
 841         struct lustre_profile *lprof;
 842
 843         ENTRY;
 844         cfs_list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
 845                 if (!strcmp(lprof->lp_profile, prof)) {
 846                         RETURN(lprof);
 847                 }
 848         }
 849         RETURN(NULL);
 850 }
 851 EXPORT_SYMBOL(class_get_profile);
 852
 853 /** Create a named "profile".
 854  * This defines the mdc and osc names to use for a client.
 855  * This also is used to define the lov to be used by a mdt.
 856  */
 857 int class_add_profile(int proflen, char *prof, int osclen, char *osc,
 858                       int mdclen, char *mdc)
 859 {
 860         struct lustre_profile *lprof;
 861         int err = 0;
 862         ENTRY;
 863
 864         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
 865
 866         OBD_ALLOC(lprof, sizeof(*lprof));
 867         if (lprof == NULL)
 868                 RETURN(-ENOMEM);
 869         CFS_INIT_LIST_HEAD(&lprof->lp_list);
 870
 871         LASSERT(proflen == (strlen(prof) + 1));
 872         OBD_ALLOC(lprof->lp_profile, proflen);
 873         if (lprof->lp_profile == NULL)
 874                 GOTO(out, err = -ENOMEM);
 875         memcpy(lprof->lp_profile, prof, proflen);
 876
 877         LASSERT(osclen == (strlen(osc) + 1));
 878         OBD_ALLOC(lprof->lp_dt, osclen);
 879         if (lprof->lp_dt == NULL)
 880                 GOTO(out, err = -ENOMEM);
 881         memcpy(lprof->lp_dt, osc, osclen);
 882
 883         if (mdclen > 0) {
 884                 LASSERT(mdclen == (strlen(mdc) + 1));
 885                 OBD_ALLOC(lprof->lp_md, mdclen);
 886                 if (lprof->lp_md == NULL)
 887                         GOTO(out, err = -ENOMEM);
 888                 memcpy(lprof->lp_md, mdc, mdclen);
 889         }
 890
 891         cfs_list_add(&lprof->lp_list, &lustre_profile_list);
 892         RETURN(err);
 893
 894 out:
 895         if (lprof->lp_md)
 896                 OBD_FREE(lprof->lp_md, mdclen);
 897         if (lprof->lp_dt)
 898                 OBD_FREE(lprof->lp_dt, osclen);
 899         if (lprof->lp_profile)
 900                 OBD_FREE(lprof->lp_profile, proflen);
 901         OBD_FREE(lprof, sizeof(*lprof));
 902         RETURN(err);
 903 }
 904
 905 void class_del_profile(const char *prof)
 906 {
 907         struct lustre_profile *lprof;
 908         ENTRY;
 909
 910         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
 911
 912         lprof = class_get_profile(prof);
 913         if (lprof) {
 914                 cfs_list_del(&lprof->lp_list);
 915                 OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
 916                 OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
 917                 if (lprof->lp_md)
 918                         OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
 919                 OBD_FREE(lprof, sizeof *lprof);
 920         }
 921         EXIT;
 922 }
 923 EXPORT_SYMBOL(class_del_profile);
 924
 925 /* COMPAT_146 */
 926 void class_del_profiles(void)
 927 {
 928         struct lustre_profile *lprof, *n;
 929         ENTRY;
 930
 931         cfs_list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
 932                 cfs_list_del(&lprof->lp_list);
 933                 OBD_FREE(lprof->lp_profile, strlen(lprof->lp_profile) + 1);
 934                 OBD_FREE(lprof->lp_dt, strlen(lprof->lp_dt) + 1);
 935                 if (lprof->lp_md)
 936                         OBD_FREE(lprof->lp_md, strlen(lprof->lp_md) + 1);
 937                 OBD_FREE(lprof, sizeof *lprof);
 938         }
 939         EXIT;
 940 }
 941 EXPORT_SYMBOL(class_del_profiles);
 942
 943 static int class_set_global(char *ptr, int val, struct lustre_cfg *lcfg)
 944 {
 945         ENTRY;
 946         if (class_match_param(ptr, PARAM_AT_MIN, NULL) == 0)
 947                 at_min = val;
 948         else if (class_match_param(ptr, PARAM_AT_MAX, NULL) == 0)
 949                 at_max = val;
 950         else if (class_match_param(ptr, PARAM_AT_EXTRA, NULL) == 0)
 951                 at_extra = val;
 952         else if (class_match_param(ptr, PARAM_AT_EARLY_MARGIN, NULL) == 0)
 953                 at_early_margin = val;
 954         else if (class_match_param(ptr, PARAM_AT_HISTORY, NULL) == 0)
 955                 at_history = val;
 956         else if (class_match_param(ptr, PARAM_JOBID_VAR, NULL) == 0)
 957                 strlcpy(obd_jobid_var, lustre_cfg_string(lcfg, 2),
 958                         JOBSTATS_JOBID_VAR_MAX_LEN + 1);
 959         else
 960                 RETURN(-EINVAL);
 961
 962         CDEBUG(D_IOCTL, "global %s = %d\n", ptr, val);
 963         RETURN(0);
 964 }
 965
 966
 967 /* We can't call ll_process_config or lquota_process_config directly because
 968  * it lives in a module that must be loaded after this one. */
 969 static int (*client_process_config)(struct lustre_cfg *lcfg) = NULL;
 970 static int (*quota_process_config)(struct lustre_cfg *lcfg) = NULL;
 971
 972 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg))
 973 {
 974         client_process_config = cpc;
 975 }
 976 EXPORT_SYMBOL(lustre_register_client_process_config);
 977
 978 /**
 979  * Rename the proc parameter in \a cfg with a new name \a new_name.
 980  *
 981  * \param cfg      config structure which contains the proc parameter
 982  * \param new_name new name of the proc parameter
 983  *
 984  * \retval valid-pointer    pointer to the newly-allocated config structure
 985  *                          which contains the renamed proc parameter
 986  * \retval ERR_PTR(-EINVAL) if \a cfg or \a new_name is NULL, or \a cfg does
 987  *                          not contain a proc parameter
 988  * \retval ERR_PTR(-ENOMEM) if memory allocation failure occurs
 989  */
 990 struct lustre_cfg *lustre_cfg_rename(struct lustre_cfg *cfg,
 991                                      const char *new_name)
 992 {
 993         struct lustre_cfg_bufs  *bufs = NULL;
 994         struct lustre_cfg       *new_cfg = NULL;
 995         char                    *param = NULL;
 996         char                    *new_param = NULL;
 997         char                    *value = NULL;
 998         int                      name_len = 0;
 999         int                      new_len = 0;
1000         ENTRY;
1001
1002         if (cfg == NULL || new_name == NULL)
1003                 RETURN(ERR_PTR(-EINVAL));
1004
1005         param = lustre_cfg_string(cfg, 1);
1006         if (param == NULL)
1007                 RETURN(ERR_PTR(-EINVAL));
1008
1009         value = strchr(param, '=');
1010         if (value == NULL)
1011                 name_len = strlen(param);
1012         else
1013                 name_len = value - param;
1014
1015         new_len = LUSTRE_CFG_BUFLEN(cfg, 1) + strlen(new_name) - name_len;
1016
1017         OBD_ALLOC(new_param, new_len);
1018         if (new_param == NULL)
1019                 RETURN(ERR_PTR(-ENOMEM));
1020
1021         strcpy(new_param, new_name);
1022         if (value != NULL)
1023                 strcat(new_param, value);
1024
1025         OBD_ALLOC_PTR(bufs);
1026         if (bufs == NULL) {
1027                 OBD_FREE(new_param, new_len);
1028                 RETURN(ERR_PTR(-ENOMEM));
1029         }
1030
1031         lustre_cfg_bufs_reset(bufs, NULL);
1032         lustre_cfg_bufs_init(bufs, cfg);
1033         lustre_cfg_bufs_set_string(bufs, 1, new_param);
1034
1035         new_cfg = lustre_cfg_new(cfg->lcfg_command, bufs);
1036
1037         OBD_FREE(new_param, new_len);
1038         OBD_FREE_PTR(bufs);
1039         if (new_cfg == NULL)
1040                 RETURN(ERR_PTR(-ENOMEM));
1041
1042         new_cfg->lcfg_num = cfg->lcfg_num;
1043         new_cfg->lcfg_flags = cfg->lcfg_flags;
1044         new_cfg->lcfg_nid = cfg->lcfg_nid;
1045         new_cfg->lcfg_nal = cfg->lcfg_nal;
1046
1047         RETURN(new_cfg);
1048 }
1049 EXPORT_SYMBOL(lustre_cfg_rename);
1050
1051 void lustre_register_quota_process_config(int (*qpc)(struct lustre_cfg *lcfg))
1052 {
1053         quota_process_config = qpc;
1054 }
1055 EXPORT_SYMBOL(lustre_register_quota_process_config);
1056
1057 /** Process configuration commands given in lustre_cfg form.
1058  * These may come from direct calls (e.g. class_manual_cleanup)
1059  * or processing the config llog, or ioctl from lctl.
1060  */
1061 int class_process_config(struct lustre_cfg *lcfg)
1062 {
1063         struct obd_device *obd;
1064         int err;
1065
1066         LASSERT(lcfg && !IS_ERR(lcfg));
1067         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
1068
1069         /* Commands that don't need a device */
1070         switch(lcfg->lcfg_command) {
1071         case LCFG_ATTACH: {
1072                 err = class_attach(lcfg);
1073                 GOTO(out, err);
1074         }
1075         case LCFG_ADD_UUID: {
1076                 CDEBUG(D_IOCTL, "adding mapping from uuid %s to nid "LPX64
1077                        " (%s)\n", lustre_cfg_string(lcfg, 1),
1078                        lcfg->lcfg_nid, libcfs_nid2str(lcfg->lcfg_nid));
1079
1080                 err = class_add_uuid(lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid);
1081                 GOTO(out, err);
1082         }
1083         case LCFG_DEL_UUID: {
1084                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
1085                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) == 0)
1086                        ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
1087
1088                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
1089                 GOTO(out, err);
1090         }
1091         case LCFG_MOUNTOPT: {
1092                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
1093                        lustre_cfg_string(lcfg, 1),
1094                        lustre_cfg_string(lcfg, 2),
1095                        lustre_cfg_string(lcfg, 3));
1096                 /* set these mount options somewhere, so ll_fill_super
1097                  * can find them. */
1098                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
1099                                         lustre_cfg_string(lcfg, 1),
1100                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
1101                                         lustre_cfg_string(lcfg, 2),
1102                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
1103                                         lustre_cfg_string(lcfg, 3));
1104                 GOTO(out, err);
1105         }
1106         case LCFG_DEL_MOUNTOPT: {
1107                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
1108                        lustre_cfg_string(lcfg, 1));
1109                 class_del_profile(lustre_cfg_string(lcfg, 1));
1110                 GOTO(out, err = 0);
1111         }
1112         case LCFG_SET_TIMEOUT: {
1113                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
1114                        obd_timeout, lcfg->lcfg_num);
1115                 obd_timeout = max(lcfg->lcfg_num, 1U);
1116                 obd_timeout_set = 1;
1117                 GOTO(out, err = 0);
1118         }
1119         case LCFG_SET_LDLM_TIMEOUT: {
1120                 CDEBUG(D_IOCTL, "changing lustre ldlm_timeout from %d to %d\n",
1121                        ldlm_timeout, lcfg->lcfg_num);
1122                 ldlm_timeout = max(lcfg->lcfg_num, 1U);
1123                 if (ldlm_timeout >= obd_timeout)
1124                         ldlm_timeout = max(obd_timeout / 3, 1U);
1125                 ldlm_timeout_set = 1;
1126                 GOTO(out, err = 0);
1127         }
1128         case LCFG_SET_UPCALL: {
1129                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
1130                 /* COMPAT_146 Don't fail on old configs */
1131                 GOTO(out, err = 0);
1132         }
1133         case LCFG_MARKER: {
1134                 struct cfg_marker *marker;
1135                 marker = lustre_cfg_buf(lcfg, 1);
1136                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
1137                        marker->cm_flags, marker->cm_tgtname, marker->cm_comment);
1138                 GOTO(out, err = 0);
1139         }
1140         case LCFG_PARAM: {
1141                 char *tmp;
1142                 /* llite has no obd */
1143                 if ((class_match_param(lustre_cfg_string(lcfg, 1),
1144                                        PARAM_LLITE, 0) == 0) &&
1145                     client_process_config) {
1146                         err = (*client_process_config)(lcfg);
1147                         GOTO(out, err);
1148                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1149                                               PARAM_SYS, &tmp) == 0)) {
1150                         /* Global param settings */
1151                         err = class_set_global(tmp, lcfg->lcfg_num, lcfg);
1152                         /*
1153                          * Client or server should not fail to mount if
1154                          * it hits an unknown configuration parameter.
1155                          */
1156                         if (err != 0)
1157                                 CWARN("Ignoring unknown param %s\n", tmp);
1158
1159                         GOTO(out, err = 0);
1160                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
1161                                               PARAM_QUOTA, &tmp) == 0) &&
1162                            quota_process_config) {
1163                         err = (*quota_process_config)(lcfg);
1164                         GOTO(out, err);
1165                 }
1166                 /* Fall through */
1167                 break;
1168         }
1169         }
1170
1171         /* Commands that require a device */
1172         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
1173         if (obd == NULL) {
1174                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
1175                         CERROR("this lcfg command requires a device name\n");
1176                 else
1177                         CERROR("no device for: %s\n",
1178                                lustre_cfg_string(lcfg, 0));
1179
1180                 GOTO(out, err = -EINVAL);
1181         }
1182
1183         switch(lcfg->lcfg_command) {
1184         case LCFG_SETUP: {
1185                 err = class_setup(obd, lcfg);
1186                 GOTO(out, err);
1187         }
1188         case LCFG_DETACH: {
1189                 err = class_detach(obd, lcfg);
1190                 GOTO(out, err = 0);
1191         }
1192         case LCFG_CLEANUP: {
1193                 err = class_cleanup(obd, lcfg);
1194                 GOTO(out, err = 0);
1195         }
1196         case LCFG_ADD_CONN: {
1197                 err = class_add_conn(obd, lcfg);
1198                 GOTO(out, err = 0);
1199         }
1200         case LCFG_DEL_CONN: {
1201                 err = class_del_conn(obd, lcfg);
1202                 GOTO(out, err = 0);
1203         }
1204         case LCFG_POOL_NEW: {
1205                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
1206                 GOTO(out, err = 0);
1207                 break;
1208         }
1209         case LCFG_POOL_ADD: {
1210                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
1211                                    lustre_cfg_string(lcfg, 3));
1212                 GOTO(out, err = 0);
1213                 break;
1214         }
1215         case LCFG_POOL_REM: {
1216                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
1217                                    lustre_cfg_string(lcfg, 3));
1218                 GOTO(out, err = 0);
1219                 break;
1220         }
1221         case LCFG_POOL_DEL: {
1222                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
1223                 GOTO(out, err = 0);
1224                 break;
1225         }
1226         default: {
1227                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1228                 GOTO(out, err);
1229
1230         }
1231         }
1232 out:
1233         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
1234                 CWARN("Ignoring error %d on optional command %#x\n", err,
1235                       lcfg->lcfg_command);
1236                 err = 0;
1237         }
1238         return err;
1239 }
1240 EXPORT_SYMBOL(class_process_config);
1241
1242 int class_process_proc_param(char *prefix, struct lprocfs_vars *lvars,
1243                              struct lustre_cfg *lcfg, void *data)
1244 {
1245 #ifdef __KERNEL__
1246         struct lprocfs_vars *var;
1247         char *key, *sval;
1248         int i, keylen, vallen;
1249         int matched = 0, j = 0;
1250         int rc = 0;
1251         int skip = 0;
1252         ENTRY;
1253
1254         if (lcfg->lcfg_command != LCFG_PARAM) {
1255                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1256                 RETURN(-EINVAL);
1257         }
1258
1259         /* e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1260            or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1261            or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36 */
1262         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1263                 key = lustre_cfg_buf(lcfg, i);
1264                 /* Strip off prefix */
1265                 class_match_param(key, prefix, &key);
1266                 sval = strchr(key, '=');
1267                 if (!sval || (*(sval + 1) == 0)) {
1268                         CERROR("Can't parse param %s (missing '=')\n", key);
1269                         /* rc = -EINVAL;        continue parsing other params */
1270                         continue;
1271                 }
1272                 keylen = sval - key;
1273                 sval++;
1274                 vallen = strlen(sval);
1275                 matched = 0;
1276                 j = 0;
1277                 /* Search proc entries */
1278                 while (lvars[j].name) {
1279                         var = &lvars[j];
1280                         if (class_match_param(key, (char *)var->name, 0) == 0 &&
1281                             keylen == strlen(var->name)) {
1282                                 matched++;
1283                                 rc = -EROFS;
1284                                 if (var->write_fptr) {
1285                                         mm_segment_t oldfs;
1286                                         oldfs = get_fs();
1287                                         set_fs(KERNEL_DS);
1288                                         rc = (var->write_fptr)(NULL, sval,
1289                                                                vallen, data);
1290                                         set_fs(oldfs);
1291                                 }
1292                                 break;
1293                         }
1294                         j++;
1295                 }
1296                 if (!matched) {
1297                         /* If the prefix doesn't match, return error so we
1298                            can pass it down the stack */
1299                         if (strnchr(key, keylen, '.'))
1300                             RETURN(-ENOSYS);
1301                         CERROR("%s: unknown param %s\n",
1302                                (char *)lustre_cfg_string(lcfg, 0), key);
1303                         /* rc = -EINVAL;        continue parsing other params */
1304                         skip++;
1305                 } else if (rc < 0) {
1306                         CERROR("writing proc entry %s err %d\n",
1307                                var->name, rc);
1308                         rc = 0;
1309                 } else {
1310                         CDEBUG(D_CONFIG, "%s.%.*s: Set parameter %.*s=%s\n",
1311                                          lustre_cfg_string(lcfg, 0),
1312                                          (int)strlen(prefix) - 1, prefix,
1313                                          (int)(sval - key - 1), key, sval);
1314                 }
1315         }
1316
1317         if (rc > 0)
1318                 rc = 0;
1319         if (!rc && skip)
1320                 rc = skip;
1321         RETURN(rc);
1322 #else
1323         CDEBUG(D_CONFIG, "liblustre can't process params.\n");
1324         /* Don't throw config error */
1325         RETURN(0);
1326 #endif
1327 }
1328 EXPORT_SYMBOL(class_process_proc_param);
1329
1330 #ifdef __KERNEL__
1331 extern int lustre_check_exclusion(struct super_block *sb, char *svname);
1332 #else
1333 #define lustre_check_exclusion(a,b)  0
1334 #endif
1335
1336 /** Parse a configuration llog, doing various manipulations on them
1337  * for various reasons, (modifications for compatibility, skip obsolete
1338  * records, change uuids, etc), then class_process_config() resulting
1339  * net records.
1340  */
1341 int class_config_llog_handler(const struct lu_env *env,
1342                               struct llog_handle *handle,
1343                               struct llog_rec_hdr *rec, void *data)
1344 {
1345         struct config_llog_instance *clli = data;
1346         int cfg_len = rec->lrh_len;
1347         char *cfg_buf = (char*) (rec + 1);
1348         int rc = 0;
1349         ENTRY;
1350
1351         //class_config_dump_handler(handle, rec, data);
1352
1353         switch (rec->lrh_type) {
1354         case OBD_CFG_REC: {
1355                 struct lustre_cfg *lcfg, *lcfg_new;
1356                 struct lustre_cfg_bufs bufs;
1357                 char *inst_name = NULL;
1358                 int inst_len = 0;
1359                 int inst = 0, swab = 0;
1360
1361                 lcfg = (struct lustre_cfg *)cfg_buf;
1362                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1363                         lustre_swab_lustre_cfg(lcfg);
1364                         swab = 1;
1365                 }
1366
1367                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1368                 if (rc)
1369                         GOTO(out, rc);
1370
1371                 /* Figure out config state info */
1372                 if (lcfg->lcfg_command == LCFG_MARKER) {
1373                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1374                         lustre_swab_cfg_marker(marker, swab,
1375                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1376                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1377                                clli->cfg_flags, marker->cm_flags);
1378                         if (marker->cm_flags & CM_START) {
1379                                 /* all previous flags off */
1380                                 clli->cfg_flags = CFG_F_MARKER;
1381                                 if (marker->cm_flags & CM_SKIP) {
1382                                         clli->cfg_flags |= CFG_F_SKIP;
1383                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1384                                                marker->cm_step);
1385                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1386                                            (clli->cfg_sb &&
1387                                             lustre_check_exclusion(clli->cfg_sb,
1388                                                          marker->cm_tgtname))) {
1389                                         clli->cfg_flags |= CFG_F_EXCLUDE;
1390                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1391                                                marker->cm_step);
1392                                 }
1393                         } else if (marker->cm_flags & CM_END) {
1394                                 clli->cfg_flags = 0;
1395                         }
1396                 }
1397                 /* A config command without a start marker before it is
1398                    illegal (post 146) */
1399                 if (!(clli->cfg_flags & CFG_F_COMPAT146) &&
1400                     !(clli->cfg_flags & CFG_F_MARKER) &&
1401                     (lcfg->lcfg_command != LCFG_MARKER)) {
1402                         CWARN("Config not inside markers, ignoring! "
1403                               "(inst: %p, uuid: %s, flags: %#x)\n",
1404                               clli->cfg_instance,
1405                               clli->cfg_uuid.uuid, clli->cfg_flags);
1406                         clli->cfg_flags |= CFG_F_SKIP;
1407                 }
1408                 if (clli->cfg_flags & CFG_F_SKIP) {
1409                         CDEBUG(D_CONFIG, "skipping %#x\n",
1410                                clli->cfg_flags);
1411                         rc = 0;
1412                         /* No processing! */
1413                         break;
1414                 }
1415
1416                 /*
1417                  * For interoperability between 1.8 and 2.0,
1418                  * rename "mds" obd device type to "mdt".
1419                  */
1420                 {
1421                         char *typename = lustre_cfg_string(lcfg, 1);
1422                         char *index = lustre_cfg_string(lcfg, 2);
1423
1424                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1425                              strcmp(typename, "mds") == 0)) {
1426                                 CWARN("For 1.8 interoperability, rename obd "
1427                                        "type from mds to mdt\n");
1428                                 typename[2] = 't';
1429                         }
1430                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1431                              strcmp(index, "type") == 0)) {
1432                                 CDEBUG(D_INFO, "For 1.8 interoperability, "
1433                                        "set this index to '0'\n");
1434                                 index[0] = '0';
1435                                 index[1] = 0;
1436                         }
1437                 }
1438
1439 #if defined(HAVE_SERVER_SUPPORT) && defined(__KERNEL__)
1440                 /* newer MDS replaces LOV/OSC with LOD/OSP */
1441                 {
1442                         char *typename = lustre_cfg_string(lcfg, 1);
1443
1444                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1445                             strcmp(typename, LUSTRE_LOV_NAME) == 0) &&
1446                             IS_MDT(s2lsi(clli->cfg_sb))) {
1447                                 CDEBUG(D_CONFIG,
1448                                        "For 2.x interoperability, rename obd "
1449                                        "type from lov to lod (%s)\n",
1450                                        s2lsi(clli->cfg_sb)->lsi_svname);
1451                                 strcpy(typename, LUSTRE_LOD_NAME);
1452                         }
1453                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1454                             strcmp(typename, LUSTRE_OSC_NAME) == 0) &&
1455                             IS_MDT(s2lsi(clli->cfg_sb))) {
1456                                 CDEBUG(D_CONFIG,
1457                                        "For 2.x interoperability, rename obd "
1458                                        "type from osc to osp (%s)\n",
1459                                        s2lsi(clli->cfg_sb)->lsi_svname);
1460                                 strcpy(typename, LUSTRE_OSP_NAME);
1461                         }
1462                 }
1463 #endif
1464
1465                 if ((clli->cfg_flags & CFG_F_EXCLUDE) &&
1466                     (lcfg->lcfg_command == LCFG_LOV_ADD_OBD))
1467                         /* Add inactive instead */
1468                         lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1469
1470                 lustre_cfg_bufs_init(&bufs, lcfg);
1471
1472                 if (clli && clli->cfg_instance &&
1473                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0){
1474                         inst = 1;
1475                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1476                                    sizeof(clli->cfg_instance) * 2 + 4;
1477                         OBD_ALLOC(inst_name, inst_len);
1478                         if (inst_name == NULL)
1479                                 GOTO(out, rc = -ENOMEM);
1480                         sprintf(inst_name, "%s-%p",
1481                                 lustre_cfg_string(lcfg, 0),
1482                                 clli->cfg_instance);
1483                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1484                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1485                                lcfg->lcfg_command, inst_name);
1486                 }
1487
1488                 /* we override the llog's uuid for clients, to insure they
1489                 are unique */
1490                 if (clli && clli->cfg_instance != NULL &&
1491                     lcfg->lcfg_command == LCFG_ATTACH) {
1492                         lustre_cfg_bufs_set_string(&bufs, 2,
1493                                                    clli->cfg_uuid.uuid);
1494                 }
1495                 /*
1496                  * sptlrpc config record, we expect 2 data segments:
1497                  *  [0]: fs_name/target_name,
1498                  *  [1]: rule string
1499                  * moving them to index [1] and [2], and insert MGC's
1500                  * obdname at index [0].
1501                  */
1502                 if (clli && clli->cfg_instance == NULL &&
1503                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1504                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1505                                             bufs.lcfg_buflen[1]);
1506                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1507                                             bufs.lcfg_buflen[0]);
1508                         lustre_cfg_bufs_set_string(&bufs, 0,
1509                                                    clli->cfg_obdname);
1510                 }
1511
1512                 lcfg_new = lustre_cfg_new(lcfg->lcfg_command, &bufs);
1513
1514                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1515                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1516
1517                 /* XXX Hack to try to remain binary compatible with
1518                  * pre-newconfig logs */
1519                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1520                     (lcfg->lcfg_nid >> 32) == 0) {
1521                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1522
1523                         lcfg_new->lcfg_nid =
1524                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1525                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
1526                               lcfg->lcfg_nal, addr,
1527                               libcfs_nid2str(lcfg_new->lcfg_nid));
1528                 } else {
1529                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
1530                 }
1531
1532                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
1533
1534                 rc = class_process_config(lcfg_new);
1535                 lustre_cfg_free(lcfg_new);
1536
1537                 if (inst)
1538                         OBD_FREE(inst_name, inst_len);
1539                 break;
1540         }
1541         default:
1542                 CERROR("Unknown llog record type %#x encountered\n",
1543                        rec->lrh_type);
1544                 break;
1545         }
1546 out:
1547         if (rc) {
1548                 CERROR("%s: cfg command failed: rc = %d\n",
1549                        handle->lgh_ctxt->loc_obd->obd_name, rc);
1550                 class_config_dump_handler(NULL, handle, rec, data);
1551         }
1552         RETURN(rc);
1553 }
1554 EXPORT_SYMBOL(class_config_llog_handler);
1555
1556 int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
1557                             char *name, struct config_llog_instance *cfg)
1558 {
1559         struct llog_process_cat_data     cd = {0, 0};
1560         struct llog_handle              *llh;
1561         llog_cb_t                        callback;
1562         int                              rc;
1563         ENTRY;
1564
1565         CDEBUG(D_INFO, "looking up llog %s\n", name);
1566         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
1567         if (rc)
1568                 RETURN(rc);
1569
1570         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
1571         if (rc)
1572                 GOTO(parse_out, rc);
1573
1574         /* continue processing from where we last stopped to end-of-log */
1575         if (cfg) {
1576                 cd.lpcd_first_idx = cfg->cfg_last_idx;
1577                 callback = cfg->cfg_callback;
1578                 LASSERT(callback != NULL);
1579         } else {
1580                 callback = class_config_llog_handler;
1581         }
1582
1583         cd.lpcd_last_idx = 0;
1584
1585         rc = llog_process(env, llh, callback, cfg, &cd);
1586
1587         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
1588                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
1589         if (cfg)
1590                 cfg->cfg_last_idx = cd.lpcd_last_idx;
1591
1592 parse_out:
1593         llog_close(env, llh);
1594         RETURN(rc);
1595 }
1596 EXPORT_SYMBOL(class_config_parse_llog);
1597
1598 /**
1599  * parse config record and output dump in supplied buffer.
1600  * This is separated from class_config_dump_handler() to use
1601  * for ioctl needs as well
1602  */
1603 int class_config_parse_rec(struct llog_rec_hdr *rec, char *buf, int size)
1604 {
1605         struct lustre_cfg       *lcfg = (struct lustre_cfg *)(rec + 1);
1606         char                    *ptr = buf;
1607         char                    *end = buf + size;
1608         int                      rc = 0;
1609
1610         ENTRY;
1611
1612         LASSERT(rec->lrh_type == OBD_CFG_REC);
1613         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
1614         if (rc < 0)
1615                 RETURN(rc);
1616
1617         ptr += snprintf(ptr, end-ptr, "cmd=%05x ", lcfg->lcfg_command);
1618         if (lcfg->lcfg_flags)
1619                 ptr += snprintf(ptr, end-ptr, "flags=%#08x ",
1620                                 lcfg->lcfg_flags);
1621
1622         if (lcfg->lcfg_num)
1623                 ptr += snprintf(ptr, end-ptr, "num=%#08x ", lcfg->lcfg_num);
1624
1625         if (lcfg->lcfg_nid)
1626                 ptr += snprintf(ptr, end-ptr, "nid=%s("LPX64")\n     ",
1627                                 libcfs_nid2str(lcfg->lcfg_nid),
1628                                 lcfg->lcfg_nid);
1629
1630         if (lcfg->lcfg_command == LCFG_MARKER) {
1631                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1632
1633                 ptr += snprintf(ptr, end-ptr, "marker=%d(%#x)%s '%s'",
1634                                 marker->cm_step, marker->cm_flags,
1635                                 marker->cm_tgtname, marker->cm_comment);
1636         } else {
1637                 int i;
1638
1639                 for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
1640                         ptr += snprintf(ptr, end-ptr, "%d:%s  ", i,
1641                                         lustre_cfg_string(lcfg, i));
1642                 }
1643         }
1644         /* return consumed bytes */
1645         rc = ptr - buf;
1646         RETURN(rc);
1647 }
1648
1649 int class_config_dump_handler(const struct lu_env *env,
1650                               struct llog_handle *handle,
1651                               struct llog_rec_hdr *rec, void *data)
1652 {
1653         char    *outstr;
1654         int      rc = 0;
1655
1656         ENTRY;
1657
1658         OBD_ALLOC(outstr, 256);
1659         if (outstr == NULL)
1660                 RETURN(-ENOMEM);
1661
1662         if (rec->lrh_type == OBD_CFG_REC) {
1663                 class_config_parse_rec(rec, outstr, 256);
1664                 LCONSOLE(D_WARNING, "   %s\n", outstr);
1665         } else {
1666                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
1667                 rc = -EINVAL;
1668         }
1669
1670         OBD_FREE(outstr, 256);
1671         RETURN(rc);
1672 }
1673
1674 int class_config_dump_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
1675                            char *name, struct config_llog_instance *cfg)
1676 {
1677         struct llog_handle      *llh;
1678         int                      rc;
1679
1680         ENTRY;
1681
1682         LCONSOLE_INFO("Dumping config log %s\n", name);
1683
1684         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
1685         if (rc)
1686                 RETURN(rc);
1687
1688         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
1689         if (rc)
1690                 GOTO(parse_out, rc);
1691
1692         rc = llog_process(env, llh, class_config_dump_handler, cfg, NULL);
1693 parse_out:
1694         llog_close(env, llh);
1695
1696         LCONSOLE_INFO("End config log %s\n", name);
1697         RETURN(rc);
1698 }
1699 EXPORT_SYMBOL(class_config_dump_llog);
1700
1701 /** Call class_cleanup and class_detach.
1702  * "Manual" only in the sense that we're faking lcfg commands.
1703  */
1704 int class_manual_cleanup(struct obd_device *obd)
1705 {
1706         char                    flags[3] = "";
1707         struct lustre_cfg      *lcfg;
1708         struct lustre_cfg_bufs  bufs;
1709         int                     rc;
1710         ENTRY;
1711
1712         if (!obd) {
1713                 CERROR("empty cleanup\n");
1714                 RETURN(-EALREADY);
1715         }
1716
1717         if (obd->obd_force)
1718                 strcat(flags, "F");
1719         if (obd->obd_fail)
1720                 strcat(flags, "A");
1721
1722         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
1723                obd->obd_name, flags);
1724
1725         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
1726         lustre_cfg_bufs_set_string(&bufs, 1, flags);
1727         lcfg = lustre_cfg_new(LCFG_CLEANUP, &bufs);
1728         if (!lcfg)
1729                 RETURN(-ENOMEM);
1730
1731         rc = class_process_config(lcfg);
1732         if (rc) {
1733                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
1734                 GOTO(out, rc);
1735         }
1736
1737         /* the lcfg is almost the same for both ops */
1738         lcfg->lcfg_command = LCFG_DETACH;
1739         rc = class_process_config(lcfg);
1740         if (rc)
1741                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
1742 out:
1743         lustre_cfg_free(lcfg);
1744         RETURN(rc);
1745 }
1746 EXPORT_SYMBOL(class_manual_cleanup);
1747
1748 /*
1749  * uuid<->export lustre hash operations
1750  */
1751
1752 static unsigned
1753 uuid_hash(cfs_hash_t *hs, const void *key, unsigned mask)
1754 {
1755         return cfs_hash_djb2_hash(((struct obd_uuid *)key)->uuid,
1756                                   sizeof(((struct obd_uuid *)key)->uuid), mask);
1757 }
1758
1759 static void *
1760 uuid_key(cfs_hlist_node_t *hnode)
1761 {
1762         struct obd_export *exp;
1763
1764         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1765
1766         return &exp->exp_client_uuid;
1767 }
1768
1769 /*
1770  * NOTE: It is impossible to find an export that is in failed
1771  *       state with this function
1772  */
1773 static int
1774 uuid_keycmp(const void *key, cfs_hlist_node_t *hnode)
1775 {
1776         struct obd_export *exp;
1777
1778         LASSERT(key);
1779         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1780
1781         return obd_uuid_equals(key, &exp->exp_client_uuid) &&
1782                !exp->exp_failed;
1783 }
1784
1785 static void *
1786 uuid_export_object(cfs_hlist_node_t *hnode)
1787 {
1788         return cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1789 }
1790
1791 static void
1792 uuid_export_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1793 {
1794         struct obd_export *exp;
1795
1796         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1797         class_export_get(exp);
1798 }
1799
1800 static void
1801 uuid_export_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1802 {
1803         struct obd_export *exp;
1804
1805         exp = cfs_hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1806         class_export_put(exp);
1807 }
1808
1809 static cfs_hash_ops_t uuid_hash_ops = {
1810         .hs_hash        = uuid_hash,
1811         .hs_key         = uuid_key,
1812         .hs_keycmp      = uuid_keycmp,
1813         .hs_object      = uuid_export_object,
1814         .hs_get         = uuid_export_get,
1815         .hs_put_locked  = uuid_export_put_locked,
1816 };
1817
1818
1819 /*
1820  * nid<->export hash operations
1821  */
1822
1823 static unsigned
1824 nid_hash(cfs_hash_t *hs, const void *key, unsigned mask)
1825 {
1826         return cfs_hash_djb2_hash(key, sizeof(lnet_nid_t), mask);
1827 }
1828
1829 static void *
1830 nid_key(cfs_hlist_node_t *hnode)
1831 {
1832         struct obd_export *exp;
1833
1834         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1835
1836         RETURN(&exp->exp_connection->c_peer.nid);
1837 }
1838
1839 /*
1840  * NOTE: It is impossible to find an export that is in failed
1841  *       state with this function
1842  */
1843 static int
1844 nid_kepcmp(const void *key, cfs_hlist_node_t *hnode)
1845 {
1846         struct obd_export *exp;
1847
1848         LASSERT(key);
1849         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1850
1851         RETURN(exp->exp_connection->c_peer.nid == *(lnet_nid_t *)key &&
1852                !exp->exp_failed);
1853 }
1854
1855 static void *
1856 nid_export_object(cfs_hlist_node_t *hnode)
1857 {
1858         return cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1859 }
1860
1861 static void
1862 nid_export_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1863 {
1864         struct obd_export *exp;
1865
1866         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1867         class_export_get(exp);
1868 }
1869
1870 static void
1871 nid_export_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1872 {
1873         struct obd_export *exp;
1874
1875         exp = cfs_hlist_entry(hnode, struct obd_export, exp_nid_hash);
1876         class_export_put(exp);
1877 }
1878
1879 static cfs_hash_ops_t nid_hash_ops = {
1880         .hs_hash        = nid_hash,
1881         .hs_key         = nid_key,
1882         .hs_keycmp      = nid_kepcmp,
1883         .hs_object      = nid_export_object,
1884         .hs_get         = nid_export_get,
1885         .hs_put_locked  = nid_export_put_locked,
1886 };
1887
1888
1889 /*
1890  * nid<->nidstats hash operations
1891  */
1892
1893 static void *
1894 nidstats_key(cfs_hlist_node_t *hnode)
1895 {
1896         struct nid_stat *ns;
1897
1898         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1899
1900         return &ns->nid;
1901 }
1902
1903 static int
1904 nidstats_keycmp(const void *key, cfs_hlist_node_t *hnode)
1905 {
1906         return *(lnet_nid_t *)nidstats_key(hnode) == *(lnet_nid_t *)key;
1907 }
1908
1909 static void *
1910 nidstats_object(cfs_hlist_node_t *hnode)
1911 {
1912         return cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1913 }
1914
1915 static void
1916 nidstats_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1917 {
1918         struct nid_stat *ns;
1919
1920         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1921         nidstat_getref(ns);
1922 }
1923
1924 static void
1925 nidstats_put_locked(cfs_hash_t *hs, cfs_hlist_node_t *hnode)
1926 {
1927         struct nid_stat *ns;
1928
1929         ns = cfs_hlist_entry(hnode, struct nid_stat, nid_hash);
1930         nidstat_putref(ns);
1931 }
1932
1933 static cfs_hash_ops_t nid_stat_hash_ops = {
1934         .hs_hash        = nid_hash,
1935         .hs_key         = nidstats_key,
1936         .hs_keycmp      = nidstats_keycmp,
1937         .hs_object      = nidstats_object,
1938         .hs_get         = nidstats_get,
1939         .hs_put_locked  = nidstats_put_locked,
1940 };