drivers/staging/lustre/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, 2015, 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/string.h>
  40
  41 #include "../include/lustre/lustre_ioctl.h"
  42 #include "../include/llog_swab.h"
  43 #include "../include/lprocfs_status.h"
  44 #include "../include/lustre_log.h"
  45 #include "../include/lustre_param.h"
  46 #include "../include/obd_class.h"
  47
  48 #include "llog_internal.h"
  49
  50 static struct cfs_hash_ops uuid_hash_ops;
  51
  52 /*********** string parsing utils *********/
  53
  54 /* returns 0 if we find this key in the buffer, else 1 */
  55 int class_find_param(char *buf, char *key, char **valp)
  56 {
  57         char *ptr;
  58
  59         if (!buf)
  60                 return 1;
  61
  62         ptr = strstr(buf, key);
  63         if (!ptr)
  64                 return 1;
  65
  66         if (valp)
  67                 *valp = ptr + strlen(key);
  68
  69         return 0;
  70 }
  71 EXPORT_SYMBOL(class_find_param);
  72
  73 /* returns 0 if this is the first key in the buffer, else 1.
  74  * valp points to first char after key.
  75  */
  76 static int class_match_param(char *buf, const char *key, char **valp)
  77 {
  78         if (!buf)
  79                 return 1;
  80
  81         if (memcmp(buf, key, strlen(key)) != 0)
  82                 return 1;
  83
  84         if (valp)
  85                 *valp = buf + strlen(key);
  86
  87         return 0;
  88 }
  89
  90 static int parse_nid(char *buf, void *value, int quiet)
  91 {
  92         lnet_nid_t *nid = value;
  93
  94         *nid = libcfs_str2nid(buf);
  95         if (*nid != LNET_NID_ANY)
  96                 return 0;
  97
  98         if (!quiet)
  99                 LCONSOLE_ERROR_MSG(0x159, "Can't parse NID '%s'\n", buf);
 100         return -EINVAL;
 101 }
 102
 103 static int parse_net(char *buf, void *value)
 104 {
 105         __u32 *net = value;
 106
 107         *net = libcfs_str2net(buf);
 108         CDEBUG(D_INFO, "Net %s\n", libcfs_net2str(*net));
 109         return 0;
 110 }
 111
 112 enum {
 113         CLASS_PARSE_NID = 1,
 114         CLASS_PARSE_NET,
 115 };
 116
 117 /* 0 is good nid,
 118  * 1 not found
 119  * < 0 error
 120  * endh is set to next separator
 121  */
 122 static int class_parse_value(char *buf, int opc, void *value, char **endh,
 123                              int quiet)
 124 {
 125         char *endp;
 126         char  tmp;
 127         int   rc = 0;
 128
 129         if (!buf)
 130                 return 1;
 131         while (*buf == ',' || *buf == ':')
 132                 buf++;
 133         if (*buf == ' ' || *buf == '/' || *buf == '\0')
 134                 return 1;
 135
 136         /* nid separators or end of nids */
 137         endp = strpbrk(buf, ",: /");
 138         if (!endp)
 139                 endp = buf + strlen(buf);
 140
 141         tmp = *endp;
 142         *endp = '\0';
 143         switch (opc) {
 144         default:
 145                 LBUG();
 146         case CLASS_PARSE_NID:
 147                 rc = parse_nid(buf, value, quiet);
 148                 break;
 149         case CLASS_PARSE_NET:
 150                 rc = parse_net(buf, value);
 151                 break;
 152         }
 153         *endp = tmp;
 154         if (rc != 0)
 155                 return rc;
 156         if (endh)
 157                 *endh = endp;
 158         return 0;
 159 }
 160
 161 int class_parse_nid(char *buf, lnet_nid_t *nid, char **endh)
 162 {
 163         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 0);
 164 }
 165 EXPORT_SYMBOL(class_parse_nid);
 166
 167 int class_parse_nid_quiet(char *buf, lnet_nid_t *nid, char **endh)
 168 {
 169         return class_parse_value(buf, CLASS_PARSE_NID, (void *)nid, endh, 1);
 170 }
 171 EXPORT_SYMBOL(class_parse_nid_quiet);
 172
 173 /********************** class fns **********************/
 174
 175 /**
 176  * Create a new obd device and set the type, name and uuid.  If successful,
 177  * the new device can be accessed by either name or uuid.
 178  */
 179 static int class_attach(struct lustre_cfg *lcfg)
 180 {
 181         struct obd_device *obd = NULL;
 182         char *typename, *name, *uuid;
 183         int rc, len;
 184
 185         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 186                 CERROR("No type passed!\n");
 187                 return -EINVAL;
 188         }
 189         typename = lustre_cfg_string(lcfg, 1);
 190
 191         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 192                 CERROR("No name passed!\n");
 193                 return -EINVAL;
 194         }
 195         name = lustre_cfg_string(lcfg, 0);
 196
 197         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 198                 CERROR("No UUID passed!\n");
 199                 return -EINVAL;
 200         }
 201         uuid = lustre_cfg_string(lcfg, 2);
 202
 203         CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 204                MKSTR(typename), MKSTR(name), MKSTR(uuid));
 205
 206         obd = class_newdev(typename, name);
 207         if (IS_ERR(obd)) {
 208                 /* Already exists or out of obds */
 209                 rc = PTR_ERR(obd);
 210                 obd = NULL;
 211                 CERROR("Cannot create device %s of type %s : %d\n",
 212                        name, typename, rc);
 213                 goto out;
 214         }
 215         LASSERTF(obd, "Cannot get obd device %s of type %s\n",
 216                  name, typename);
 217         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 218                  "obd %p obd_magic %08X != %08X\n",
 219                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 220         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 221                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 222
 223         rwlock_init(&obd->obd_pool_lock);
 224         obd->obd_pool_limit = 0;
 225         obd->obd_pool_slv = 0;
 226
 227         INIT_LIST_HEAD(&obd->obd_exports);
 228         INIT_LIST_HEAD(&obd->obd_unlinked_exports);
 229         INIT_LIST_HEAD(&obd->obd_delayed_exports);
 230         spin_lock_init(&obd->obd_nid_lock);
 231         spin_lock_init(&obd->obd_dev_lock);
 232         mutex_init(&obd->obd_dev_mutex);
 233         spin_lock_init(&obd->obd_osfs_lock);
 234         /* obd->obd_osfs_age must be set to a value in the distant
 235          * past to guarantee a fresh statfs is fetched on mount.
 236          */
 237         obd->obd_osfs_age = cfs_time_shift_64(-1000);
 238
 239         /* XXX belongs in setup not attach  */
 240         init_rwsem(&obd->obd_observer_link_sem);
 241         /* recovery data */
 242         init_waitqueue_head(&obd->obd_evict_inprogress_waitq);
 243
 244         llog_group_init(&obd->obd_olg);
 245
 246         obd->obd_conn_inprogress = 0;
 247
 248         len = strlen(uuid);
 249         if (len >= sizeof(obd->obd_uuid)) {
 250                 CERROR("uuid must be < %d bytes long\n",
 251                        (int)sizeof(obd->obd_uuid));
 252                 rc = -EINVAL;
 253                 goto out;
 254         }
 255         memcpy(obd->obd_uuid.uuid, uuid, len);
 256
 257         /* Detach drops this */
 258         spin_lock(&obd->obd_dev_lock);
 259         atomic_set(&obd->obd_refcount, 1);
 260         spin_unlock(&obd->obd_dev_lock);
 261         lu_ref_init(&obd->obd_reference);
 262         lu_ref_add(&obd->obd_reference, "attach", obd);
 263
 264         obd->obd_attached = 1;
 265         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 266                obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
 267         return 0;
 268  out:
 269         if (obd)
 270                 class_release_dev(obd);
 271
 272         return rc;
 273 }
 274
 275 /** Create hashes, self-export, and call type-specific setup.
 276  * Setup is effectively the "start this obd" call.
 277  */
 278 static int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 279 {
 280         int err = 0;
 281         struct obd_export *exp;
 282
 283         LASSERT(obd);
 284         LASSERTF(obd == class_num2obd(obd->obd_minor),
 285                  "obd %p != obd_devs[%d] %p\n",
 286                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 287         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 288                  "obd %p obd_magic %08x != %08x\n",
 289                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 290
 291         /* have we attached a type to this device? */
 292         if (!obd->obd_attached) {
 293                 CERROR("Device %d not attached\n", obd->obd_minor);
 294                 return -ENODEV;
 295         }
 296
 297         if (obd->obd_set_up) {
 298                 CERROR("Device %d already setup (type %s)\n",
 299                        obd->obd_minor, obd->obd_type->typ_name);
 300                 return -EEXIST;
 301         }
 302
 303         /* is someone else setting us up right now? (attach inits spinlock) */
 304         spin_lock(&obd->obd_dev_lock);
 305         if (obd->obd_starting) {
 306                 spin_unlock(&obd->obd_dev_lock);
 307                 CERROR("Device %d setup in progress (type %s)\n",
 308                        obd->obd_minor, obd->obd_type->typ_name);
 309                 return -EEXIST;
 310         }
 311         /* just leave this on forever.  I can't use obd_set_up here because
 312          * other fns check that status, and we're not actually set up yet.
 313          */
 314         obd->obd_starting = 1;
 315         obd->obd_uuid_hash = NULL;
 316         spin_unlock(&obd->obd_dev_lock);
 317
 318         /* create an uuid-export lustre hash */
 319         obd->obd_uuid_hash = cfs_hash_create("UUID_HASH",
 320                                              HASH_UUID_CUR_BITS,
 321                                              HASH_UUID_MAX_BITS,
 322                                              HASH_UUID_BKT_BITS, 0,
 323                                              CFS_HASH_MIN_THETA,
 324                                              CFS_HASH_MAX_THETA,
 325                                              &uuid_hash_ops, CFS_HASH_DEFAULT);
 326         if (!obd->obd_uuid_hash) {
 327                 err = -ENOMEM;
 328                 goto err_hash;
 329         }
 330
 331         exp = class_new_export(obd, &obd->obd_uuid);
 332         if (IS_ERR(exp)) {
 333                 err = PTR_ERR(exp);
 334                 goto err_hash;
 335         }
 336
 337         obd->obd_self_export = exp;
 338         class_export_put(exp);
 339
 340         err = obd_setup(obd, lcfg);
 341         if (err)
 342                 goto err_exp;
 343
 344         obd->obd_set_up = 1;
 345
 346         spin_lock(&obd->obd_dev_lock);
 347         /* cleanup drops this */
 348         class_incref(obd, "setup", obd);
 349         spin_unlock(&obd->obd_dev_lock);
 350
 351         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 352                obd->obd_name, obd->obd_uuid.uuid);
 353
 354         return 0;
 355 err_exp:
 356         if (obd->obd_self_export) {
 357                 class_unlink_export(obd->obd_self_export);
 358                 obd->obd_self_export = NULL;
 359         }
 360 err_hash:
 361         if (obd->obd_uuid_hash) {
 362                 cfs_hash_putref(obd->obd_uuid_hash);
 363                 obd->obd_uuid_hash = NULL;
 364         }
 365         obd->obd_starting = 0;
 366         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 367         return err;
 368 }
 369
 370 /** We have finished using this obd and are ready to destroy it.
 371  * There can be no more references to this obd.
 372  */
 373 static int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 374 {
 375         if (obd->obd_set_up) {
 376                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 377                 return -EBUSY;
 378         }
 379
 380         spin_lock(&obd->obd_dev_lock);
 381         if (!obd->obd_attached) {
 382                 spin_unlock(&obd->obd_dev_lock);
 383                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 384                 return -ENODEV;
 385         }
 386         obd->obd_attached = 0;
 387         spin_unlock(&obd->obd_dev_lock);
 388
 389         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 390                obd->obd_name, obd->obd_uuid.uuid);
 391
 392         class_decref(obd, "attach", obd);
 393         return 0;
 394 }
 395
 396 /** Start shutting down the obd.  There may be in-progress ops when
 397  * this is called.  We tell them to start shutting down with a call
 398  * to class_disconnect_exports().
 399  */
 400 static int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 401 {
 402         int err = 0;
 403         char *flag;
 404
 405         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 406
 407         if (!obd->obd_set_up) {
 408                 CERROR("Device %d not setup\n", obd->obd_minor);
 409                 return -ENODEV;
 410         }
 411
 412         spin_lock(&obd->obd_dev_lock);
 413         if (obd->obd_stopping) {
 414                 spin_unlock(&obd->obd_dev_lock);
 415                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 416                 return -ENODEV;
 417         }
 418         /* Leave this on forever */
 419         obd->obd_stopping = 1;
 420         spin_unlock(&obd->obd_dev_lock);
 421
 422         while (obd->obd_conn_inprogress > 0)
 423                 yield();
 424         smp_rmb();
 425
 426         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 427                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 428                         switch (*flag) {
 429                         case 'F':
 430                                 obd->obd_force = 1;
 431                                 break;
 432                         case 'A':
 433                                 LCONSOLE_WARN("Failing over %s\n",
 434                                               obd->obd_name);
 435                                 obd->obd_fail = 1;
 436                                 obd->obd_no_transno = 1;
 437                                 obd->obd_no_recov = 1;
 438                                 if (OBP(obd, iocontrol)) {
 439                                         obd_iocontrol(OBD_IOC_SYNC,
 440                                                       obd->obd_self_export,
 441                                                       0, NULL, NULL);
 442                                 }
 443                                 break;
 444                         default:
 445                                 CERROR("Unrecognised flag '%c'\n", *flag);
 446                         }
 447         }
 448
 449         LASSERT(obd->obd_self_export);
 450
 451         /* Precleanup, we must make sure all exports get destroyed. */
 452         err = obd_precleanup(obd);
 453         if (err)
 454                 CERROR("Precleanup %s returned %d\n",
 455                        obd->obd_name, err);
 456
 457         /* destroy an uuid-export hash body */
 458         if (obd->obd_uuid_hash) {
 459                 cfs_hash_putref(obd->obd_uuid_hash);
 460                 obd->obd_uuid_hash = NULL;
 461         }
 462
 463         class_decref(obd, "setup", obd);
 464         obd->obd_set_up = 0;
 465
 466         return 0;
 467 }
 468
 469 struct obd_device *class_incref(struct obd_device *obd,
 470                                 const char *scope, const void *source)
 471 {
 472         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 473         atomic_inc(&obd->obd_refcount);
 474         CDEBUG(D_INFO, "incref %s (%p) now %d\n", obd->obd_name, obd,
 475                atomic_read(&obd->obd_refcount));
 476
 477         return obd;
 478 }
 479 EXPORT_SYMBOL(class_incref);
 480
 481 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 482 {
 483         int err;
 484         int refs;
 485
 486         spin_lock(&obd->obd_dev_lock);
 487         atomic_dec(&obd->obd_refcount);
 488         refs = atomic_read(&obd->obd_refcount);
 489         spin_unlock(&obd->obd_dev_lock);
 490         lu_ref_del(&obd->obd_reference, scope, source);
 491
 492         CDEBUG(D_INFO, "Decref %s (%p) now %d\n", obd->obd_name, obd, refs);
 493
 494         if ((refs == 1) && obd->obd_stopping) {
 495                 /* All exports have been destroyed; there should
 496                  * be no more in-progress ops by this point.
 497                  */
 498
 499                 spin_lock(&obd->obd_self_export->exp_lock);
 500                 obd->obd_self_export->exp_flags |= exp_flags_from_obd(obd);
 501                 spin_unlock(&obd->obd_self_export->exp_lock);
 502
 503                 /* note that we'll recurse into class_decref again */
 504                 class_unlink_export(obd->obd_self_export);
 505                 return;
 506         }
 507
 508         if (refs == 0) {
 509                 CDEBUG(D_CONFIG, "finishing cleanup of obd %s (%s)\n",
 510                        obd->obd_name, obd->obd_uuid.uuid);
 511                 LASSERT(!obd->obd_attached);
 512                 if (obd->obd_stopping) {
 513                         /* If we're not stopping, we were never set up */
 514                         err = obd_cleanup(obd);
 515                         if (err)
 516                                 CERROR("Cleanup %s returned %d\n",
 517                                        obd->obd_name, err);
 518                 }
 519                 class_release_dev(obd);
 520         }
 521 }
 522 EXPORT_SYMBOL(class_decref);
 523
 524 /** Add a failover nid location.
 525  * Client obd types contact server obd types using this nid list.
 526  */
 527 static int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 528 {
 529         struct obd_import *imp;
 530         struct obd_uuid uuid;
 531         int rc;
 532
 533         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 534             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 535                 CERROR("invalid conn_uuid\n");
 536                 return -EINVAL;
 537         }
 538         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 539             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME) &&
 540             strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) &&
 541             strcmp(obd->obd_type->typ_name, LUSTRE_LWP_NAME) &&
 542             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
 543                 CERROR("can't add connection on non-client dev\n");
 544                 return -EINVAL;
 545         }
 546
 547         imp = obd->u.cli.cl_import;
 548         if (!imp) {
 549                 CERROR("try to add conn on immature client dev\n");
 550                 return -EINVAL;
 551         }
 552
 553         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 554         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
 555
 556         return rc;
 557 }
 558
 559 /** Remove a failover nid location.
 560  */
 561 static int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 562 {
 563         struct obd_import *imp;
 564         struct obd_uuid uuid;
 565         int rc;
 566
 567         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 568             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 569                 CERROR("invalid conn_uuid\n");
 570                 return -EINVAL;
 571         }
 572         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 573             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 574                 CERROR("can't del connection on non-client dev\n");
 575                 return -EINVAL;
 576         }
 577
 578         imp = obd->u.cli.cl_import;
 579         if (!imp) {
 580                 CERROR("try to del conn on immature client dev\n");
 581                 return -EINVAL;
 582         }
 583
 584         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 585         rc = obd_del_conn(imp, &uuid);
 586
 587         return rc;
 588 }
 589
 590 static LIST_HEAD(lustre_profile_list);
 591 static DEFINE_SPINLOCK(lustre_profile_list_lock);
 592
 593 struct lustre_profile *class_get_profile(const char *prof)
 594 {
 595         struct lustre_profile *lprof;
 596
 597         spin_lock(&lustre_profile_list_lock);
 598         list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
 599                 if (!strcmp(lprof->lp_profile, prof)) {
 600                         lprof->lp_refs++;
 601                         spin_unlock(&lustre_profile_list_lock);
 602                         return lprof;
 603                 }
 604         }
 605         spin_unlock(&lustre_profile_list_lock);
 606         return NULL;
 607 }
 608 EXPORT_SYMBOL(class_get_profile);
 609
 610 /** Create a named "profile".
 611  * This defines the mdc and osc names to use for a client.
 612  * This also is used to define the lov to be used by a mdt.
 613  */
 614 static int class_add_profile(int proflen, char *prof, int osclen, char *osc,
 615                              int mdclen, char *mdc)
 616 {
 617         struct lustre_profile *lprof;
 618         int err = 0;
 619
 620         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
 621
 622         lprof = kzalloc(sizeof(*lprof), GFP_NOFS);
 623         if (!lprof)
 624                 return -ENOMEM;
 625         INIT_LIST_HEAD(&lprof->lp_list);
 626
 627         LASSERT(proflen == (strlen(prof) + 1));
 628         lprof->lp_profile = kmemdup(prof, proflen, GFP_NOFS);
 629         if (!lprof->lp_profile) {
 630                 err = -ENOMEM;
 631                 goto free_lprof;
 632         }
 633
 634         LASSERT(osclen == (strlen(osc) + 1));
 635         lprof->lp_dt = kmemdup(osc, osclen, GFP_NOFS);
 636         if (!lprof->lp_dt) {
 637                 err = -ENOMEM;
 638                 goto free_lp_profile;
 639         }
 640
 641         if (mdclen > 0) {
 642                 LASSERT(mdclen == (strlen(mdc) + 1));
 643                 lprof->lp_md = kmemdup(mdc, mdclen, GFP_NOFS);
 644                 if (!lprof->lp_md) {
 645                         err = -ENOMEM;
 646                         goto free_lp_dt;
 647                 }
 648         }
 649
 650         spin_lock(&lustre_profile_list_lock);
 651         lprof->lp_refs = 1;
 652         lprof->lp_list_deleted = false;
 653         list_add(&lprof->lp_list, &lustre_profile_list);
 654         spin_unlock(&lustre_profile_list_lock);
 655         return err;
 656
 657 free_lp_dt:
 658         kfree(lprof->lp_dt);
 659 free_lp_profile:
 660         kfree(lprof->lp_profile);
 661 free_lprof:
 662         kfree(lprof);
 663         return err;
 664 }
 665
 666 void class_del_profile(const char *prof)
 667 {
 668         struct lustre_profile *lprof;
 669
 670         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
 671
 672         lprof = class_get_profile(prof);
 673         if (lprof) {
 674                 spin_lock(&lustre_profile_list_lock);
 675                 /* because get profile increments the ref counter */
 676                 lprof->lp_refs--;
 677                 list_del(&lprof->lp_list);
 678                 lprof->lp_list_deleted = true;
 679                 spin_unlock(&lustre_profile_list_lock);
 680
 681                 class_put_profile(lprof);
 682         }
 683 }
 684 EXPORT_SYMBOL(class_del_profile);
 685
 686 void class_put_profile(struct lustre_profile *lprof)
 687 {
 688         spin_lock(&lustre_profile_list_lock);
 689         if (--lprof->lp_refs > 0) {
 690                 LASSERT(lprof->lp_refs > 0);
 691                 spin_unlock(&lustre_profile_list_lock);
 692                 return;
 693         }
 694         spin_unlock(&lustre_profile_list_lock);
 695
 696         /* confirm not a negative number */
 697         LASSERT(!lprof->lp_refs);
 698
 699         /*
 700          * At least one class_del_profile/profiles must be called
 701          * on the target profile or lustre_profile_list will corrupt
 702          */
 703         LASSERT(lprof->lp_list_deleted);
 704         kfree(lprof->lp_profile);
 705         kfree(lprof->lp_dt);
 706         kfree(lprof->lp_md);
 707         kfree(lprof);
 708 }
 709 EXPORT_SYMBOL(class_put_profile);
 710
 711 /* COMPAT_146 */
 712 void class_del_profiles(void)
 713 {
 714         struct lustre_profile *lprof, *n;
 715
 716         spin_lock(&lustre_profile_list_lock);
 717         list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
 718                 list_del(&lprof->lp_list);
 719                 lprof->lp_list_deleted = true;
 720                 spin_unlock(&lustre_profile_list_lock);
 721
 722                 class_put_profile(lprof);
 723
 724                 spin_lock(&lustre_profile_list_lock);
 725         }
 726         spin_unlock(&lustre_profile_list_lock);
 727 }
 728 EXPORT_SYMBOL(class_del_profiles);
 729
 730 static int class_set_global(char *ptr, int val, struct lustre_cfg *lcfg)
 731 {
 732         if (class_match_param(ptr, PARAM_AT_MIN, NULL) == 0)
 733                 at_min = val;
 734         else if (class_match_param(ptr, PARAM_AT_MAX, NULL) == 0)
 735                 at_max = val;
 736         else if (class_match_param(ptr, PARAM_AT_EXTRA, NULL) == 0)
 737                 at_extra = val;
 738         else if (class_match_param(ptr, PARAM_AT_EARLY_MARGIN, NULL) == 0)
 739                 at_early_margin = val;
 740         else if (class_match_param(ptr, PARAM_AT_HISTORY, NULL) == 0)
 741                 at_history = val;
 742         else if (class_match_param(ptr, PARAM_JOBID_VAR, NULL) == 0)
 743                 strlcpy(obd_jobid_var, lustre_cfg_string(lcfg, 2),
 744                         JOBSTATS_JOBID_VAR_MAX_LEN + 1);
 745         else
 746                 return -EINVAL;
 747
 748         CDEBUG(D_IOCTL, "global %s = %d\n", ptr, val);
 749         return 0;
 750 }
 751
 752 /* We can't call ll_process_config or lquota_process_config directly because
 753  * it lives in a module that must be loaded after this one.
 754  */
 755 static int (*client_process_config)(struct lustre_cfg *lcfg);
 756 static int (*quota_process_config)(struct lustre_cfg *lcfg);
 757
 758 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg))
 759 {
 760         client_process_config = cpc;
 761 }
 762 EXPORT_SYMBOL(lustre_register_client_process_config);
 763
 764 static int process_param2_config(struct lustre_cfg *lcfg)
 765 {
 766         char *param = lustre_cfg_string(lcfg, 1);
 767         char *upcall = lustre_cfg_string(lcfg, 2);
 768         char *argv[] = {
 769                 [0] = "/usr/sbin/lctl",
 770                 [1] = "set_param",
 771                 [2] = param,
 772                 [3] = NULL
 773         };
 774         ktime_t start;
 775         ktime_t end;
 776         int             rc;
 777
 778         /* Add upcall processing here. Now only lctl is supported */
 779         if (strcmp(upcall, LCTL_UPCALL) != 0) {
 780                 CERROR("Unsupported upcall %s\n", upcall);
 781                 return -EINVAL;
 782         }
 783
 784         start = ktime_get();
 785         rc = call_usermodehelper(argv[0], argv, NULL, UMH_WAIT_PROC);
 786         end = ktime_get();
 787
 788         if (rc < 0) {
 789                 CERROR(
 790                        "lctl: error invoking upcall %s %s %s: rc = %d; time %ldus\n",
 791                        argv[0], argv[1], argv[2], rc,
 792                        (long)ktime_us_delta(end, start));
 793         } else {
 794                 CDEBUG(D_HA, "lctl: invoked upcall %s %s %s, time %ldus\n",
 795                        argv[0], argv[1], argv[2],
 796                        (long)ktime_us_delta(end, start));
 797                        rc = 0;
 798         }
 799
 800         return rc;
 801 }
 802
 803 /** Process configuration commands given in lustre_cfg form.
 804  * These may come from direct calls (e.g. class_manual_cleanup)
 805  * or processing the config llog, or ioctl from lctl.
 806  */
 807 int class_process_config(struct lustre_cfg *lcfg)
 808 {
 809         struct obd_device *obd;
 810         int err;
 811
 812         LASSERT(lcfg && !IS_ERR(lcfg));
 813         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
 814
 815         /* Commands that don't need a device */
 816         switch (lcfg->lcfg_command) {
 817         case LCFG_ATTACH: {
 818                 err = class_attach(lcfg);
 819                 goto out;
 820         }
 821         case LCFG_ADD_UUID: {
 822                 CDEBUG(D_IOCTL, "adding mapping from uuid %s to nid %#llx (%s)\n",
 823                        lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid,
 824                        libcfs_nid2str(lcfg->lcfg_nid));
 825
 826                 err = class_add_uuid(lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid);
 827                 goto out;
 828         }
 829         case LCFG_DEL_UUID: {
 830                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
 831                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) == 0)
 832                        ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
 833
 834                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
 835                 goto out;
 836         }
 837         case LCFG_MOUNTOPT: {
 838                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
 839                        lustre_cfg_string(lcfg, 1),
 840                        lustre_cfg_string(lcfg, 2),
 841                        lustre_cfg_string(lcfg, 3));
 842                 /* set these mount options somewhere, so ll_fill_super
 843                  * can find them.
 844                  */
 845                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
 846                                         lustre_cfg_string(lcfg, 1),
 847                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
 848                                         lustre_cfg_string(lcfg, 2),
 849                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
 850                                         lustre_cfg_string(lcfg, 3));
 851                 goto out;
 852         }
 853         case LCFG_DEL_MOUNTOPT: {
 854                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
 855                        lustre_cfg_string(lcfg, 1));
 856                 class_del_profile(lustre_cfg_string(lcfg, 1));
 857                 err = 0;
 858                 goto out;
 859         }
 860         case LCFG_SET_TIMEOUT: {
 861                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
 862                        obd_timeout, lcfg->lcfg_num);
 863                 obd_timeout = max(lcfg->lcfg_num, 1U);
 864                 obd_timeout_set = 1;
 865                 err = 0;
 866                 goto out;
 867         }
 868         case LCFG_SET_LDLM_TIMEOUT: {
 869                 /* ldlm_timeout is not used on the client */
 870                 err = 0;
 871                 goto out;
 872         }
 873         case LCFG_SET_UPCALL: {
 874                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
 875                 /* COMPAT_146 Don't fail on old configs */
 876                 err = 0;
 877                 goto out;
 878         }
 879         case LCFG_MARKER: {
 880                 struct cfg_marker *marker;
 881
 882                 marker = lustre_cfg_buf(lcfg, 1);
 883                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
 884                        marker->cm_flags, marker->cm_tgtname, marker->cm_comment);
 885                 err = 0;
 886                 goto out;
 887         }
 888         case LCFG_PARAM: {
 889                 char *tmp;
 890                 /* llite has no obd */
 891                 if ((class_match_param(lustre_cfg_string(lcfg, 1),
 892                                        PARAM_LLITE, NULL) == 0) &&
 893                     client_process_config) {
 894                         err = (*client_process_config)(lcfg);
 895                         goto out;
 896                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
 897                                               PARAM_SYS, &tmp) == 0)) {
 898                         /* Global param settings */
 899                         err = class_set_global(tmp, lcfg->lcfg_num, lcfg);
 900                         /*
 901                          * Client or server should not fail to mount if
 902                          * it hits an unknown configuration parameter.
 903                          */
 904                         if (err != 0)
 905                                 CWARN("Ignoring unknown param %s\n", tmp);
 906
 907                         err = 0;
 908                         goto out;
 909                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
 910                                               PARAM_QUOTA, &tmp) == 0) &&
 911                            quota_process_config) {
 912                         err = (*quota_process_config)(lcfg);
 913                         goto out;
 914                 }
 915
 916                 break;
 917         }
 918         case LCFG_SET_PARAM: {
 919                 err = process_param2_config(lcfg);
 920                 goto out;
 921         }
 922         }
 923         /* Commands that require a device */
 924         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
 925         if (!obd) {
 926                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
 927                         CERROR("this lcfg command requires a device name\n");
 928                 else
 929                         CERROR("no device for: %s\n",
 930                                lustre_cfg_string(lcfg, 0));
 931
 932                 err = -EINVAL;
 933                 goto out;
 934         }
 935
 936         switch (lcfg->lcfg_command) {
 937         case LCFG_SETUP: {
 938                 err = class_setup(obd, lcfg);
 939                 goto out;
 940         }
 941         case LCFG_DETACH: {
 942                 err = class_detach(obd, lcfg);
 943                 err = 0;
 944                 goto out;
 945         }
 946         case LCFG_CLEANUP: {
 947                 err = class_cleanup(obd, lcfg);
 948                 err = 0;
 949                 goto out;
 950         }
 951         case LCFG_ADD_CONN: {
 952                 err = class_add_conn(obd, lcfg);
 953                 err = 0;
 954                 goto out;
 955         }
 956         case LCFG_DEL_CONN: {
 957                 err = class_del_conn(obd, lcfg);
 958                 err = 0;
 959                 goto out;
 960         }
 961         case LCFG_POOL_NEW: {
 962                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
 963                 err = 0;
 964                 goto out;
 965         }
 966         case LCFG_POOL_ADD: {
 967                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
 968                                    lustre_cfg_string(lcfg, 3));
 969                 err = 0;
 970                 goto out;
 971         }
 972         case LCFG_POOL_REM: {
 973                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
 974                                    lustre_cfg_string(lcfg, 3));
 975                 err = 0;
 976                 goto out;
 977         }
 978         case LCFG_POOL_DEL: {
 979                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
 980                 err = 0;
 981                 goto out;
 982         }
 983         default: {
 984                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
 985                 goto out;
 986         }
 987         }
 988 out:
 989         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
 990                 CWARN("Ignoring error %d on optional command %#x\n", err,
 991                       lcfg->lcfg_command);
 992                 err = 0;
 993         }
 994         return err;
 995 }
 996 EXPORT_SYMBOL(class_process_config);
 997
 998 int class_process_proc_param(char *prefix, struct lprocfs_vars *lvars,
 999                              struct lustre_cfg *lcfg, void *data)
1000 {
1001         struct lprocfs_vars *var;
1002         struct file fakefile;
1003         struct seq_file fake_seqfile;
1004         char *key, *sval;
1005         int i, keylen, vallen;
1006         int matched = 0, j = 0;
1007         int rc = 0;
1008         int skip = 0;
1009
1010         if (lcfg->lcfg_command != LCFG_PARAM) {
1011                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1012                 return -EINVAL;
1013         }
1014
1015         /* fake a seq file so that var->fops->write can work... */
1016         fakefile.private_data = &fake_seqfile;
1017         fake_seqfile.private = data;
1018         /* e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1019          * or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1020          * or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36
1021          */
1022         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1023                 key = lustre_cfg_buf(lcfg, i);
1024                 /* Strip off prefix */
1025                 if (class_match_param(key, prefix, &key)) {
1026                         /*
1027                          * If the prefix doesn't match, return error so we
1028                          * can pass it down the stack
1029                          */
1030                         return -ENOSYS;
1031                 }
1032                 sval = strchr(key, '=');
1033                 if (!sval || (*(sval + 1) == 0)) {
1034                         CERROR("Can't parse param %s (missing '=')\n", key);
1035                         /* rc = -EINVAL;        continue parsing other params */
1036                         continue;
1037                 }
1038                 keylen = sval - key;
1039                 sval++;
1040                 vallen = strlen(sval);
1041                 matched = 0;
1042                 j = 0;
1043                 /* Search proc entries */
1044                 while (lvars[j].name) {
1045                         var = &lvars[j];
1046                         if (!class_match_param(key, var->name, NULL) &&
1047                             keylen == strlen(var->name)) {
1048                                 matched++;
1049                                 rc = -EROFS;
1050                                 if (var->fops && var->fops->write) {
1051                                         mm_segment_t oldfs;
1052
1053                                         oldfs = get_fs();
1054                                         set_fs(KERNEL_DS);
1055                                         rc = var->fops->write(&fakefile,
1056                                                 (const char __user *)sval,
1057                                                                 vallen, NULL);
1058                                         set_fs(oldfs);
1059                                 }
1060                                 break;
1061                         }
1062                         j++;
1063                 }
1064                 if (!matched) {
1065                         CERROR("%.*s: %s unknown param %s\n",
1066                                (int)strlen(prefix) - 1, prefix,
1067                                (char *)lustre_cfg_string(lcfg, 0), key);
1068                         /* rc = -EINVAL;        continue parsing other params */
1069                         skip++;
1070                 } else if (rc < 0) {
1071                         CERROR("%s: error writing proc entry '%s': rc = %d\n",
1072                                prefix, var->name, rc);
1073                         rc = 0;
1074                 } else {
1075                         CDEBUG(D_CONFIG, "%s.%.*s: Set parameter %.*s=%s\n",
1076                                lustre_cfg_string(lcfg, 0),
1077                                (int)strlen(prefix) - 1, prefix,
1078                                (int)(sval - key - 1), key, sval);
1079                 }
1080         }
1081
1082         if (rc > 0)
1083                 rc = 0;
1084         if (!rc && skip)
1085                 rc = skip;
1086         return rc;
1087 }
1088 EXPORT_SYMBOL(class_process_proc_param);
1089
1090 /** Parse a configuration llog, doing various manipulations on them
1091  * for various reasons, (modifications for compatibility, skip obsolete
1092  * records, change uuids, etc), then class_process_config() resulting
1093  * net records.
1094  */
1095 int class_config_llog_handler(const struct lu_env *env,
1096                               struct llog_handle *handle,
1097                               struct llog_rec_hdr *rec, void *data)
1098 {
1099         struct config_llog_instance *clli = data;
1100         int cfg_len = rec->lrh_len;
1101         char *cfg_buf = (char *)(rec + 1);
1102         int rc = 0;
1103
1104         switch (rec->lrh_type) {
1105         case OBD_CFG_REC: {
1106                 struct lustre_cfg *lcfg, *lcfg_new;
1107                 struct lustre_cfg_bufs bufs;
1108                 char *inst_name = NULL;
1109                 int inst_len = 0;
1110                 int inst = 0, swab = 0;
1111
1112                 lcfg = (struct lustre_cfg *)cfg_buf;
1113                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1114                         lustre_swab_lustre_cfg(lcfg);
1115                         swab = 1;
1116                 }
1117
1118                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1119                 if (rc)
1120                         goto out;
1121
1122                 /* Figure out config state info */
1123                 if (lcfg->lcfg_command == LCFG_MARKER) {
1124                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1125
1126                         lustre_swab_cfg_marker(marker, swab,
1127                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1128                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1129                                clli->cfg_flags, marker->cm_flags);
1130                         if (marker->cm_flags & CM_START) {
1131                                 /* all previous flags off */
1132                                 clli->cfg_flags = CFG_F_MARKER;
1133                                 if (marker->cm_flags & CM_SKIP) {
1134                                         clli->cfg_flags |= CFG_F_SKIP;
1135                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1136                                                marker->cm_step);
1137                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1138                                            (clli->cfg_sb &&
1139                                             lustre_check_exclusion(clli->cfg_sb,
1140                                                          marker->cm_tgtname))) {
1141                                         clli->cfg_flags |= CFG_F_EXCLUDE;
1142                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1143                                                marker->cm_step);
1144                                 }
1145                         } else if (marker->cm_flags & CM_END) {
1146                                 clli->cfg_flags = 0;
1147                         }
1148                 }
1149                 /* A config command without a start marker before it is
1150                  * illegal (post 146)
1151                  */
1152                 if (!(clli->cfg_flags & CFG_F_COMPAT146) &&
1153                     !(clli->cfg_flags & CFG_F_MARKER) &&
1154                     (lcfg->lcfg_command != LCFG_MARKER)) {
1155                         CWARN("Config not inside markers, ignoring! (inst: %p, uuid: %s, flags: %#x)\n",
1156                               clli->cfg_instance,
1157                               clli->cfg_uuid.uuid, clli->cfg_flags);
1158                         clli->cfg_flags |= CFG_F_SKIP;
1159                 }
1160                 if (clli->cfg_flags & CFG_F_SKIP) {
1161                         CDEBUG(D_CONFIG, "skipping %#x\n",
1162                                clli->cfg_flags);
1163                         rc = 0;
1164                         /* No processing! */
1165                         break;
1166                 }
1167
1168                 /*
1169                  * For interoperability between 1.8 and 2.0,
1170                  * rename "mds" obd device type to "mdt".
1171                  */
1172                 {
1173                         char *typename = lustre_cfg_string(lcfg, 1);
1174                         char *index = lustre_cfg_string(lcfg, 2);
1175
1176                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1177                              strcmp(typename, "mds") == 0)) {
1178                                 CWARN("For 1.8 interoperability, rename obd type from mds to mdt\n");
1179                                 typename[2] = 't';
1180                         }
1181                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1182                              strcmp(index, "type") == 0)) {
1183                                 CDEBUG(D_INFO, "For 1.8 interoperability, set this index to '0'\n");
1184                                 index[0] = '0';
1185                                 index[1] = 0;
1186                         }
1187                 }
1188
1189                 if (clli->cfg_flags & CFG_F_EXCLUDE) {
1190                         CDEBUG(D_CONFIG, "cmd: %x marked EXCLUDED\n",
1191                                lcfg->lcfg_command);
1192                         if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD)
1193                                 /* Add inactive instead */
1194                                 lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1195                 }
1196
1197                 lustre_cfg_bufs_init(&bufs, lcfg);
1198
1199                 if (clli && clli->cfg_instance &&
1200                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
1201                         inst = 1;
1202                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1203                                    sizeof(clli->cfg_instance) * 2 + 4;
1204                         inst_name = kasprintf(GFP_NOFS, "%s-%p",
1205                                               lustre_cfg_string(lcfg, 0),
1206                                               clli->cfg_instance);
1207                         if (!inst_name) {
1208                                 rc = -ENOMEM;
1209                                 goto out;
1210                         }
1211                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1212                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1213                                lcfg->lcfg_command, inst_name);
1214                 }
1215
1216                 /* we override the llog's uuid for clients, to insure they
1217                  * are unique
1218                  */
1219                 if (clli && clli->cfg_instance &&
1220                     lcfg->lcfg_command == LCFG_ATTACH) {
1221                         lustre_cfg_bufs_set_string(&bufs, 2,
1222                                                    clli->cfg_uuid.uuid);
1223                 }
1224                 /*
1225                  * sptlrpc config record, we expect 2 data segments:
1226                  *  [0]: fs_name/target_name,
1227                  *  [1]: rule string
1228                  * moving them to index [1] and [2], and insert MGC's
1229                  * obdname at index [0].
1230                  */
1231                 if (clli && !clli->cfg_instance &&
1232                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1233                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1234                                             bufs.lcfg_buflen[1]);
1235                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1236                                             bufs.lcfg_buflen[0]);
1237                         lustre_cfg_bufs_set_string(&bufs, 0,
1238                                                    clli->cfg_obdname);
1239                 }
1240
1241                 lcfg_new = lustre_cfg_new(lcfg->lcfg_command, &bufs);
1242
1243                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1244                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1245
1246                 /* XXX Hack to try to remain binary compatible with
1247                  * pre-newconfig logs
1248                  */
1249                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1250                     (lcfg->lcfg_nid >> 32) == 0) {
1251                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1252
1253                         lcfg_new->lcfg_nid =
1254                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1255                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
1256                               lcfg->lcfg_nal, addr,
1257                               libcfs_nid2str(lcfg_new->lcfg_nid));
1258                 } else {
1259                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
1260                 }
1261
1262                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
1263
1264                 rc = class_process_config(lcfg_new);
1265                 lustre_cfg_free(lcfg_new);
1266
1267                 if (inst)
1268                         kfree(inst_name);
1269                 break;
1270         }
1271         default:
1272                 CERROR("Unknown llog record type %#x encountered\n",
1273                        rec->lrh_type);
1274                 break;
1275         }
1276 out:
1277         if (rc) {
1278                 CERROR("%s: cfg command failed: rc = %d\n",
1279                        handle->lgh_ctxt->loc_obd->obd_name, rc);
1280                 class_config_dump_handler(NULL, handle, rec, data);
1281         }
1282         return rc;
1283 }
1284 EXPORT_SYMBOL(class_config_llog_handler);
1285
1286 int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
1287                             char *name, struct config_llog_instance *cfg)
1288 {
1289         struct llog_process_cat_data     cd = {0, 0};
1290         struct llog_handle              *llh;
1291         llog_cb_t                        callback;
1292         int                              rc;
1293
1294         CDEBUG(D_INFO, "looking up llog %s\n", name);
1295         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
1296         if (rc)
1297                 return rc;
1298
1299         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
1300         if (rc)
1301                 goto parse_out;
1302
1303         /* continue processing from where we last stopped to end-of-log */
1304         if (cfg) {
1305                 cd.lpcd_first_idx = cfg->cfg_last_idx;
1306                 callback = cfg->cfg_callback;
1307                 LASSERT(callback);
1308         } else {
1309                 callback = class_config_llog_handler;
1310         }
1311
1312         cd.lpcd_last_idx = 0;
1313
1314         rc = llog_process(env, llh, callback, cfg, &cd);
1315
1316         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
1317                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
1318         if (cfg)
1319                 cfg->cfg_last_idx = cd.lpcd_last_idx;
1320
1321 parse_out:
1322         llog_close(env, llh);
1323         return rc;
1324 }
1325 EXPORT_SYMBOL(class_config_parse_llog);
1326
1327 /**
1328  * parse config record and output dump in supplied buffer.
1329  * This is separated from class_config_dump_handler() to use
1330  * for ioctl needs as well
1331  */
1332 static int class_config_parse_rec(struct llog_rec_hdr *rec, char *buf,
1333                                   int size)
1334 {
1335         struct lustre_cfg       *lcfg = (struct lustre_cfg *)(rec + 1);
1336         char                    *ptr = buf;
1337         char                    *end = buf + size;
1338         int                      rc = 0;
1339
1340         LASSERT(rec->lrh_type == OBD_CFG_REC);
1341         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
1342         if (rc < 0)
1343                 return rc;
1344
1345         ptr += snprintf(ptr, end - ptr, "cmd=%05x ", lcfg->lcfg_command);
1346         if (lcfg->lcfg_flags)
1347                 ptr += snprintf(ptr, end - ptr, "flags=%#08x ",
1348                                 lcfg->lcfg_flags);
1349
1350         if (lcfg->lcfg_num)
1351                 ptr += snprintf(ptr, end - ptr, "num=%#08x ", lcfg->lcfg_num);
1352
1353         if (lcfg->lcfg_nid) {
1354                 char nidstr[LNET_NIDSTR_SIZE];
1355
1356                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
1357                 ptr += snprintf(ptr, end - ptr, "nid=%s(%#llx)\n     ",
1358                                 nidstr, lcfg->lcfg_nid);
1359         }
1360
1361         if (lcfg->lcfg_command == LCFG_MARKER) {
1362                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1363
1364                 ptr += snprintf(ptr, end - ptr, "marker=%d(%#x)%s '%s'",
1365                                 marker->cm_step, marker->cm_flags,
1366                                 marker->cm_tgtname, marker->cm_comment);
1367         } else {
1368                 int i;
1369
1370                 for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
1371                         ptr += snprintf(ptr, end - ptr, "%d:%s  ", i,
1372                                         lustre_cfg_string(lcfg, i));
1373                 }
1374         }
1375         ptr += snprintf(ptr, end - ptr, "\n");
1376         /* return consumed bytes */
1377         rc = ptr - buf;
1378         return rc;
1379 }
1380
1381 int class_config_dump_handler(const struct lu_env *env,
1382                               struct llog_handle *handle,
1383                               struct llog_rec_hdr *rec, void *data)
1384 {
1385         char    *outstr;
1386         int      rc = 0;
1387
1388         outstr = kzalloc(256, GFP_NOFS);
1389         if (!outstr)
1390                 return -ENOMEM;
1391
1392         if (rec->lrh_type == OBD_CFG_REC) {
1393                 class_config_parse_rec(rec, outstr, 256);
1394                 LCONSOLE(D_WARNING, "   %s", outstr);
1395         } else {
1396                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
1397                 rc = -EINVAL;
1398         }
1399
1400         kfree(outstr);
1401         return rc;
1402 }
1403
1404 /** Call class_cleanup and class_detach.
1405  * "Manual" only in the sense that we're faking lcfg commands.
1406  */
1407 int class_manual_cleanup(struct obd_device *obd)
1408 {
1409         char                flags[3] = "";
1410         struct lustre_cfg      *lcfg;
1411         struct lustre_cfg_bufs  bufs;
1412         int                  rc;
1413
1414         if (!obd) {
1415                 CERROR("empty cleanup\n");
1416                 return -EALREADY;
1417         }
1418
1419         if (obd->obd_force)
1420                 strcat(flags, "F");
1421         if (obd->obd_fail)
1422                 strcat(flags, "A");
1423
1424         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
1425                obd->obd_name, flags);
1426
1427         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
1428         lustre_cfg_bufs_set_string(&bufs, 1, flags);
1429         lcfg = lustre_cfg_new(LCFG_CLEANUP, &bufs);
1430         if (IS_ERR(lcfg))
1431                 return PTR_ERR(lcfg);
1432
1433         rc = class_process_config(lcfg);
1434         if (rc) {
1435                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
1436                 goto out;
1437         }
1438
1439         /* the lcfg is almost the same for both ops */
1440         lcfg->lcfg_command = LCFG_DETACH;
1441         rc = class_process_config(lcfg);
1442         if (rc)
1443                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
1444 out:
1445         lustre_cfg_free(lcfg);
1446         return rc;
1447 }
1448 EXPORT_SYMBOL(class_manual_cleanup);
1449
1450 /*
1451  * uuid<->export lustre hash operations
1452  */
1453
1454 static unsigned int
1455 uuid_hash(struct cfs_hash *hs, const void *key, unsigned int mask)
1456 {
1457         return cfs_hash_djb2_hash(((struct obd_uuid *)key)->uuid,
1458                                   sizeof(((struct obd_uuid *)key)->uuid), mask);
1459 }
1460
1461 static void *
1462 uuid_key(struct hlist_node *hnode)
1463 {
1464         struct obd_export *exp;
1465
1466         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1467
1468         return &exp->exp_client_uuid;
1469 }
1470
1471 /*
1472  * NOTE: It is impossible to find an export that is in failed
1473  *       state with this function
1474  */
1475 static int
1476 uuid_keycmp(const void *key, struct hlist_node *hnode)
1477 {
1478         struct obd_export *exp;
1479
1480         LASSERT(key);
1481         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1482
1483         return obd_uuid_equals(key, &exp->exp_client_uuid) &&
1484                !exp->exp_failed;
1485 }
1486
1487 static void *
1488 uuid_export_object(struct hlist_node *hnode)
1489 {
1490         return hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1491 }
1492
1493 static void
1494 uuid_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
1495 {
1496         struct obd_export *exp;
1497
1498         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1499         class_export_get(exp);
1500 }
1501
1502 static void
1503 uuid_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
1504 {
1505         struct obd_export *exp;
1506
1507         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1508         class_export_put(exp);
1509 }
1510
1511 static struct cfs_hash_ops uuid_hash_ops = {
1512         .hs_hash        = uuid_hash,
1513         .hs_key         = uuid_key,
1514         .hs_keycmp      = uuid_keycmp,
1515         .hs_object      = uuid_export_object,
1516         .hs_get         = uuid_export_get,
1517         .hs_put_locked  = uuid_export_put_locked,
1518 };