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 <uapi/linux/lustre/lustre_ioctl.h>
  42 #include <llog_swab.h>
  43 #include <lprocfs_status.h>
  44 #include <lustre_log.h>
  45 #include <uapi/linux/lustre/lustre_param.h>
  46 #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 char *lustre_cfg_string(struct lustre_cfg *lcfg, u32 index)
 174 {
 175         char *s;
 176
 177         if (!lcfg->lcfg_buflens[index])
 178                 return NULL;
 179
 180         s = lustre_cfg_buf(lcfg, index);
 181         if (!s)
 182                 return NULL;
 183
 184         /*
 185          * make sure it's NULL terminated, even if this kills a char
 186          * of data.  Try to use the padding first though.
 187          */
 188         if (s[lcfg->lcfg_buflens[index] - 1] != '\0') {
 189                 size_t last = ALIGN(lcfg->lcfg_buflens[index], 8) - 1;
 190                 char lost;
 191
 192                 /* Use the smaller value */
 193                 if (last > lcfg->lcfg_buflens[index])
 194                         last = lcfg->lcfg_buflens[index];
 195
 196                 lost = s[last];
 197                 s[last] = '\0';
 198                 if (lost != '\0') {
 199                         CWARN("Truncated buf %d to '%s' (lost '%c'...)\n",
 200                               index, s, lost);
 201                 }
 202         }
 203         return s;
 204 }
 205 EXPORT_SYMBOL(lustre_cfg_string);
 206
 207 /********************** class fns **********************/
 208
 209 /**
 210  * Create a new obd device and set the type, name and uuid.  If successful,
 211  * the new device can be accessed by either name or uuid.
 212  */
 213 static int class_attach(struct lustre_cfg *lcfg)
 214 {
 215         struct obd_device *obd = NULL;
 216         char *typename, *name, *uuid;
 217         int rc, len;
 218
 219         if (!LUSTRE_CFG_BUFLEN(lcfg, 1)) {
 220                 CERROR("No type passed!\n");
 221                 return -EINVAL;
 222         }
 223         typename = lustre_cfg_string(lcfg, 1);
 224
 225         if (!LUSTRE_CFG_BUFLEN(lcfg, 0)) {
 226                 CERROR("No name passed!\n");
 227                 return -EINVAL;
 228         }
 229         name = lustre_cfg_string(lcfg, 0);
 230
 231         if (!LUSTRE_CFG_BUFLEN(lcfg, 2)) {
 232                 CERROR("No UUID passed!\n");
 233                 return -EINVAL;
 234         }
 235         uuid = lustre_cfg_string(lcfg, 2);
 236
 237         CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 238                MKSTR(typename), MKSTR(name), MKSTR(uuid));
 239
 240         obd = class_newdev(typename, name);
 241         if (IS_ERR(obd)) {
 242                 /* Already exists or out of obds */
 243                 rc = PTR_ERR(obd);
 244                 obd = NULL;
 245                 CERROR("Cannot create device %s of type %s : %d\n",
 246                        name, typename, rc);
 247                 goto out;
 248         }
 249         LASSERTF(obd, "Cannot get obd device %s of type %s\n",
 250                  name, typename);
 251         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 252                  "obd %p obd_magic %08X != %08X\n",
 253                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 254         LASSERTF(strncmp(obd->obd_name, name, strlen(name)) == 0,
 255                  "%p obd_name %s != %s\n", obd, obd->obd_name, name);
 256
 257         rwlock_init(&obd->obd_pool_lock);
 258         obd->obd_pool_limit = 0;
 259         obd->obd_pool_slv = 0;
 260
 261         INIT_LIST_HEAD(&obd->obd_exports);
 262         INIT_LIST_HEAD(&obd->obd_unlinked_exports);
 263         INIT_LIST_HEAD(&obd->obd_delayed_exports);
 264         spin_lock_init(&obd->obd_nid_lock);
 265         spin_lock_init(&obd->obd_dev_lock);
 266         mutex_init(&obd->obd_dev_mutex);
 267         spin_lock_init(&obd->obd_osfs_lock);
 268         /* obd->obd_osfs_age must be set to a value in the distant
 269          * past to guarantee a fresh statfs is fetched on mount.
 270          */
 271         obd->obd_osfs_age = cfs_time_shift_64(-1000);
 272
 273         /* XXX belongs in setup not attach  */
 274         init_rwsem(&obd->obd_observer_link_sem);
 275         /* recovery data */
 276         init_waitqueue_head(&obd->obd_evict_inprogress_waitq);
 277
 278         llog_group_init(&obd->obd_olg);
 279
 280         obd->obd_conn_inprogress = 0;
 281
 282         len = strlen(uuid);
 283         if (len >= sizeof(obd->obd_uuid)) {
 284                 CERROR("uuid must be < %d bytes long\n",
 285                        (int)sizeof(obd->obd_uuid));
 286                 rc = -EINVAL;
 287                 goto out;
 288         }
 289         memcpy(obd->obd_uuid.uuid, uuid, len);
 290
 291         /* Detach drops this */
 292         spin_lock(&obd->obd_dev_lock);
 293         atomic_set(&obd->obd_refcount, 1);
 294         spin_unlock(&obd->obd_dev_lock);
 295         lu_ref_init(&obd->obd_reference);
 296         lu_ref_add(&obd->obd_reference, "attach", obd);
 297
 298         obd->obd_attached = 1;
 299         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s with refcount %d\n",
 300                obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
 301         return 0;
 302  out:
 303         if (obd)
 304                 class_release_dev(obd);
 305
 306         return rc;
 307 }
 308
 309 /** Create hashes, self-export, and call type-specific setup.
 310  * Setup is effectively the "start this obd" call.
 311  */
 312 static int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 313 {
 314         int err = 0;
 315         struct obd_export *exp;
 316
 317         LASSERT(obd);
 318         LASSERTF(obd == class_num2obd(obd->obd_minor),
 319                  "obd %p != obd_devs[%d] %p\n",
 320                  obd, obd->obd_minor, class_num2obd(obd->obd_minor));
 321         LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 322                  "obd %p obd_magic %08x != %08x\n",
 323                  obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 324
 325         /* have we attached a type to this device? */
 326         if (!obd->obd_attached) {
 327                 CERROR("Device %d not attached\n", obd->obd_minor);
 328                 return -ENODEV;
 329         }
 330
 331         if (obd->obd_set_up) {
 332                 CERROR("Device %d already setup (type %s)\n",
 333                        obd->obd_minor, obd->obd_type->typ_name);
 334                 return -EEXIST;
 335         }
 336
 337         /* is someone else setting us up right now? (attach inits spinlock) */
 338         spin_lock(&obd->obd_dev_lock);
 339         if (obd->obd_starting) {
 340                 spin_unlock(&obd->obd_dev_lock);
 341                 CERROR("Device %d setup in progress (type %s)\n",
 342                        obd->obd_minor, obd->obd_type->typ_name);
 343                 return -EEXIST;
 344         }
 345         /* just leave this on forever.  I can't use obd_set_up here because
 346          * other fns check that status, and we're not actually set up yet.
 347          */
 348         obd->obd_starting = 1;
 349         obd->obd_uuid_hash = NULL;
 350         spin_unlock(&obd->obd_dev_lock);
 351
 352         /* create an uuid-export lustre hash */
 353         obd->obd_uuid_hash = cfs_hash_create("UUID_HASH",
 354                                              HASH_UUID_CUR_BITS,
 355                                              HASH_UUID_MAX_BITS,
 356                                              HASH_UUID_BKT_BITS, 0,
 357                                              CFS_HASH_MIN_THETA,
 358                                              CFS_HASH_MAX_THETA,
 359                                              &uuid_hash_ops, CFS_HASH_DEFAULT);
 360         if (!obd->obd_uuid_hash) {
 361                 err = -ENOMEM;
 362                 goto err_hash;
 363         }
 364
 365         exp = class_new_export(obd, &obd->obd_uuid);
 366         if (IS_ERR(exp)) {
 367                 err = PTR_ERR(exp);
 368                 goto err_hash;
 369         }
 370
 371         obd->obd_self_export = exp;
 372         class_export_put(exp);
 373
 374         err = obd_setup(obd, lcfg);
 375         if (err)
 376                 goto err_exp;
 377
 378         obd->obd_set_up = 1;
 379
 380         spin_lock(&obd->obd_dev_lock);
 381         /* cleanup drops this */
 382         class_incref(obd, "setup", obd);
 383         spin_unlock(&obd->obd_dev_lock);
 384
 385         CDEBUG(D_IOCTL, "finished setup of obd %s (uuid %s)\n",
 386                obd->obd_name, obd->obd_uuid.uuid);
 387
 388         return 0;
 389 err_exp:
 390         if (obd->obd_self_export) {
 391                 class_unlink_export(obd->obd_self_export);
 392                 obd->obd_self_export = NULL;
 393         }
 394 err_hash:
 395         if (obd->obd_uuid_hash) {
 396                 cfs_hash_putref(obd->obd_uuid_hash);
 397                 obd->obd_uuid_hash = NULL;
 398         }
 399         obd->obd_starting = 0;
 400         CERROR("setup %s failed (%d)\n", obd->obd_name, err);
 401         return err;
 402 }
 403
 404 /** We have finished using this obd and are ready to destroy it.
 405  * There can be no more references to this obd.
 406  */
 407 static int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
 408 {
 409         if (obd->obd_set_up) {
 410                 CERROR("OBD device %d still set up\n", obd->obd_minor);
 411                 return -EBUSY;
 412         }
 413
 414         spin_lock(&obd->obd_dev_lock);
 415         if (!obd->obd_attached) {
 416                 spin_unlock(&obd->obd_dev_lock);
 417                 CERROR("OBD device %d not attached\n", obd->obd_minor);
 418                 return -ENODEV;
 419         }
 420         obd->obd_attached = 0;
 421         spin_unlock(&obd->obd_dev_lock);
 422
 423         CDEBUG(D_IOCTL, "detach on obd %s (uuid %s)\n",
 424                obd->obd_name, obd->obd_uuid.uuid);
 425
 426         class_decref(obd, "attach", obd);
 427         return 0;
 428 }
 429
 430 /** Start shutting down the obd.  There may be in-progress ops when
 431  * this is called.  We tell them to start shutting down with a call
 432  * to class_disconnect_exports().
 433  */
 434 static int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
 435 {
 436         int err = 0;
 437         char *flag;
 438
 439         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
 440
 441         if (!obd->obd_set_up) {
 442                 CERROR("Device %d not setup\n", obd->obd_minor);
 443                 return -ENODEV;
 444         }
 445
 446         spin_lock(&obd->obd_dev_lock);
 447         if (obd->obd_stopping) {
 448                 spin_unlock(&obd->obd_dev_lock);
 449                 CERROR("OBD %d already stopping\n", obd->obd_minor);
 450                 return -ENODEV;
 451         }
 452         /* Leave this on forever */
 453         obd->obd_stopping = 1;
 454         spin_unlock(&obd->obd_dev_lock);
 455
 456         while (obd->obd_conn_inprogress > 0)
 457                 yield();
 458         smp_rmb();
 459
 460         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
 461                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)
 462                         switch (*flag) {
 463                         case 'F':
 464                                 obd->obd_force = 1;
 465                                 break;
 466                         case 'A':
 467                                 LCONSOLE_WARN("Failing over %s\n",
 468                                               obd->obd_name);
 469                                 obd->obd_fail = 1;
 470                                 obd->obd_no_transno = 1;
 471                                 obd->obd_no_recov = 1;
 472                                 if (OBP(obd, iocontrol)) {
 473                                         obd_iocontrol(OBD_IOC_SYNC,
 474                                                       obd->obd_self_export,
 475                                                       0, NULL, NULL);
 476                                 }
 477                                 break;
 478                         default:
 479                                 CERROR("Unrecognised flag '%c'\n", *flag);
 480                         }
 481         }
 482
 483         LASSERT(obd->obd_self_export);
 484
 485         /* Precleanup, we must make sure all exports get destroyed. */
 486         err = obd_precleanup(obd);
 487         if (err)
 488                 CERROR("Precleanup %s returned %d\n",
 489                        obd->obd_name, err);
 490
 491         /* destroy an uuid-export hash body */
 492         if (obd->obd_uuid_hash) {
 493                 cfs_hash_putref(obd->obd_uuid_hash);
 494                 obd->obd_uuid_hash = NULL;
 495         }
 496
 497         class_decref(obd, "setup", obd);
 498         obd->obd_set_up = 0;
 499
 500         return 0;
 501 }
 502
 503 struct obd_device *class_incref(struct obd_device *obd,
 504                                 const char *scope, const void *source)
 505 {
 506         lu_ref_add_atomic(&obd->obd_reference, scope, source);
 507         atomic_inc(&obd->obd_refcount);
 508         CDEBUG(D_INFO, "incref %s (%p) now %d\n", obd->obd_name, obd,
 509                atomic_read(&obd->obd_refcount));
 510
 511         return obd;
 512 }
 513 EXPORT_SYMBOL(class_incref);
 514
 515 void class_decref(struct obd_device *obd, const char *scope, const void *source)
 516 {
 517         int err;
 518         int refs;
 519
 520         spin_lock(&obd->obd_dev_lock);
 521         atomic_dec(&obd->obd_refcount);
 522         refs = atomic_read(&obd->obd_refcount);
 523         spin_unlock(&obd->obd_dev_lock);
 524         lu_ref_del(&obd->obd_reference, scope, source);
 525
 526         CDEBUG(D_INFO, "Decref %s (%p) now %d\n", obd->obd_name, obd, refs);
 527
 528         if ((refs == 1) && obd->obd_stopping) {
 529                 /* All exports have been destroyed; there should
 530                  * be no more in-progress ops by this point.
 531                  */
 532
 533                 spin_lock(&obd->obd_self_export->exp_lock);
 534                 obd->obd_self_export->exp_flags |= exp_flags_from_obd(obd);
 535                 spin_unlock(&obd->obd_self_export->exp_lock);
 536
 537                 /* note that we'll recurse into class_decref again */
 538                 class_unlink_export(obd->obd_self_export);
 539                 return;
 540         }
 541
 542         if (refs == 0) {
 543                 CDEBUG(D_CONFIG, "finishing cleanup of obd %s (%s)\n",
 544                        obd->obd_name, obd->obd_uuid.uuid);
 545                 LASSERT(!obd->obd_attached);
 546                 if (obd->obd_stopping) {
 547                         /* If we're not stopping, we were never set up */
 548                         err = obd_cleanup(obd);
 549                         if (err)
 550                                 CERROR("Cleanup %s returned %d\n",
 551                                        obd->obd_name, err);
 552                 }
 553                 class_release_dev(obd);
 554         }
 555 }
 556 EXPORT_SYMBOL(class_decref);
 557
 558 /** Add a failover nid location.
 559  * Client obd types contact server obd types using this nid list.
 560  */
 561 static int class_add_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             strcmp(obd->obd_type->typ_name, LUSTRE_OSP_NAME) &&
 575             strcmp(obd->obd_type->typ_name, LUSTRE_LWP_NAME) &&
 576             strcmp(obd->obd_type->typ_name, LUSTRE_MGC_NAME)) {
 577                 CERROR("can't add connection on non-client dev\n");
 578                 return -EINVAL;
 579         }
 580
 581         imp = obd->u.cli.cl_import;
 582         if (!imp) {
 583                 CERROR("try to add conn on immature client dev\n");
 584                 return -EINVAL;
 585         }
 586
 587         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 588         rc = obd_add_conn(imp, &uuid, lcfg->lcfg_num);
 589
 590         return rc;
 591 }
 592
 593 /** Remove a failover nid location.
 594  */
 595 static int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
 596 {
 597         struct obd_import *imp;
 598         struct obd_uuid uuid;
 599         int rc;
 600
 601         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1 ||
 602             LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(struct obd_uuid)) {
 603                 CERROR("invalid conn_uuid\n");
 604                 return -EINVAL;
 605         }
 606         if (strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) &&
 607             strcmp(obd->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 608                 CERROR("can't del connection on non-client dev\n");
 609                 return -EINVAL;
 610         }
 611
 612         imp = obd->u.cli.cl_import;
 613         if (!imp) {
 614                 CERROR("try to del conn on immature client dev\n");
 615                 return -EINVAL;
 616         }
 617
 618         obd_str2uuid(&uuid, lustre_cfg_string(lcfg, 1));
 619         rc = obd_del_conn(imp, &uuid);
 620
 621         return rc;
 622 }
 623
 624 static LIST_HEAD(lustre_profile_list);
 625 static DEFINE_SPINLOCK(lustre_profile_list_lock);
 626
 627 struct lustre_profile *class_get_profile(const char *prof)
 628 {
 629         struct lustre_profile *lprof;
 630
 631         spin_lock(&lustre_profile_list_lock);
 632         list_for_each_entry(lprof, &lustre_profile_list, lp_list) {
 633                 if (!strcmp(lprof->lp_profile, prof)) {
 634                         lprof->lp_refs++;
 635                         spin_unlock(&lustre_profile_list_lock);
 636                         return lprof;
 637                 }
 638         }
 639         spin_unlock(&lustre_profile_list_lock);
 640         return NULL;
 641 }
 642 EXPORT_SYMBOL(class_get_profile);
 643
 644 /** Create a named "profile".
 645  * This defines the mdc and osc names to use for a client.
 646  * This also is used to define the lov to be used by a mdt.
 647  */
 648 static int class_add_profile(int proflen, char *prof, int osclen, char *osc,
 649                              int mdclen, char *mdc)
 650 {
 651         struct lustre_profile *lprof;
 652         int err = 0;
 653
 654         CDEBUG(D_CONFIG, "Add profile %s\n", prof);
 655
 656         lprof = kzalloc(sizeof(*lprof), GFP_NOFS);
 657         if (!lprof)
 658                 return -ENOMEM;
 659         INIT_LIST_HEAD(&lprof->lp_list);
 660
 661         LASSERT(proflen == (strlen(prof) + 1));
 662         lprof->lp_profile = kmemdup(prof, proflen, GFP_NOFS);
 663         if (!lprof->lp_profile) {
 664                 err = -ENOMEM;
 665                 goto free_lprof;
 666         }
 667
 668         LASSERT(osclen == (strlen(osc) + 1));
 669         lprof->lp_dt = kmemdup(osc, osclen, GFP_NOFS);
 670         if (!lprof->lp_dt) {
 671                 err = -ENOMEM;
 672                 goto free_lp_profile;
 673         }
 674
 675         if (mdclen > 0) {
 676                 LASSERT(mdclen == (strlen(mdc) + 1));
 677                 lprof->lp_md = kmemdup(mdc, mdclen, GFP_NOFS);
 678                 if (!lprof->lp_md) {
 679                         err = -ENOMEM;
 680                         goto free_lp_dt;
 681                 }
 682         }
 683
 684         spin_lock(&lustre_profile_list_lock);
 685         lprof->lp_refs = 1;
 686         lprof->lp_list_deleted = false;
 687         list_add(&lprof->lp_list, &lustre_profile_list);
 688         spin_unlock(&lustre_profile_list_lock);
 689         return err;
 690
 691 free_lp_dt:
 692         kfree(lprof->lp_dt);
 693 free_lp_profile:
 694         kfree(lprof->lp_profile);
 695 free_lprof:
 696         kfree(lprof);
 697         return err;
 698 }
 699
 700 void class_del_profile(const char *prof)
 701 {
 702         struct lustre_profile *lprof;
 703
 704         CDEBUG(D_CONFIG, "Del profile %s\n", prof);
 705
 706         lprof = class_get_profile(prof);
 707         if (lprof) {
 708                 spin_lock(&lustre_profile_list_lock);
 709                 /* because get profile increments the ref counter */
 710                 lprof->lp_refs--;
 711                 list_del(&lprof->lp_list);
 712                 lprof->lp_list_deleted = true;
 713                 spin_unlock(&lustre_profile_list_lock);
 714
 715                 class_put_profile(lprof);
 716         }
 717 }
 718 EXPORT_SYMBOL(class_del_profile);
 719
 720 void class_put_profile(struct lustre_profile *lprof)
 721 {
 722         spin_lock(&lustre_profile_list_lock);
 723         if (--lprof->lp_refs > 0) {
 724                 LASSERT(lprof->lp_refs > 0);
 725                 spin_unlock(&lustre_profile_list_lock);
 726                 return;
 727         }
 728         spin_unlock(&lustre_profile_list_lock);
 729
 730         /* confirm not a negative number */
 731         LASSERT(!lprof->lp_refs);
 732
 733         /*
 734          * At least one class_del_profile/profiles must be called
 735          * on the target profile or lustre_profile_list will corrupt
 736          */
 737         LASSERT(lprof->lp_list_deleted);
 738         kfree(lprof->lp_profile);
 739         kfree(lprof->lp_dt);
 740         kfree(lprof->lp_md);
 741         kfree(lprof);
 742 }
 743 EXPORT_SYMBOL(class_put_profile);
 744
 745 /* COMPAT_146 */
 746 void class_del_profiles(void)
 747 {
 748         struct lustre_profile *lprof, *n;
 749
 750         spin_lock(&lustre_profile_list_lock);
 751         list_for_each_entry_safe(lprof, n, &lustre_profile_list, lp_list) {
 752                 list_del(&lprof->lp_list);
 753                 lprof->lp_list_deleted = true;
 754                 spin_unlock(&lustre_profile_list_lock);
 755
 756                 class_put_profile(lprof);
 757
 758                 spin_lock(&lustre_profile_list_lock);
 759         }
 760         spin_unlock(&lustre_profile_list_lock);
 761 }
 762 EXPORT_SYMBOL(class_del_profiles);
 763
 764 static int class_set_global(char *ptr, int val, struct lustre_cfg *lcfg)
 765 {
 766         if (class_match_param(ptr, PARAM_AT_MIN, NULL) == 0)
 767                 at_min = val;
 768         else if (class_match_param(ptr, PARAM_AT_MAX, NULL) == 0)
 769                 at_max = val;
 770         else if (class_match_param(ptr, PARAM_AT_EXTRA, NULL) == 0)
 771                 at_extra = val;
 772         else if (class_match_param(ptr, PARAM_AT_EARLY_MARGIN, NULL) == 0)
 773                 at_early_margin = val;
 774         else if (class_match_param(ptr, PARAM_AT_HISTORY, NULL) == 0)
 775                 at_history = val;
 776         else if (class_match_param(ptr, PARAM_JOBID_VAR, NULL) == 0)
 777                 strlcpy(obd_jobid_var, lustre_cfg_string(lcfg, 2),
 778                         JOBSTATS_JOBID_VAR_MAX_LEN + 1);
 779         else
 780                 return -EINVAL;
 781
 782         CDEBUG(D_IOCTL, "global %s = %d\n", ptr, val);
 783         return 0;
 784 }
 785
 786 /* We can't call ll_process_config or lquota_process_config directly because
 787  * it lives in a module that must be loaded after this one.
 788  */
 789 static int (*client_process_config)(struct lustre_cfg *lcfg);
 790 static int (*quota_process_config)(struct lustre_cfg *lcfg);
 791
 792 void lustre_register_client_process_config(int (*cpc)(struct lustre_cfg *lcfg))
 793 {
 794         client_process_config = cpc;
 795 }
 796 EXPORT_SYMBOL(lustre_register_client_process_config);
 797
 798 static int process_param2_config(struct lustre_cfg *lcfg)
 799 {
 800         char *param = lustre_cfg_string(lcfg, 1);
 801         char *upcall = lustre_cfg_string(lcfg, 2);
 802         char *argv[] = {
 803                 [0] = "/usr/sbin/lctl",
 804                 [1] = "set_param",
 805                 [2] = param,
 806                 [3] = NULL
 807         };
 808         ktime_t start;
 809         ktime_t end;
 810         int             rc;
 811
 812         /* Add upcall processing here. Now only lctl is supported */
 813         if (strcmp(upcall, LCTL_UPCALL) != 0) {
 814                 CERROR("Unsupported upcall %s\n", upcall);
 815                 return -EINVAL;
 816         }
 817
 818         start = ktime_get();
 819         rc = call_usermodehelper(argv[0], argv, NULL, UMH_WAIT_PROC);
 820         end = ktime_get();
 821
 822         if (rc < 0) {
 823                 CERROR(
 824                        "lctl: error invoking upcall %s %s %s: rc = %d; time %ldus\n",
 825                        argv[0], argv[1], argv[2], rc,
 826                        (long)ktime_us_delta(end, start));
 827         } else {
 828                 CDEBUG(D_HA, "lctl: invoked upcall %s %s %s, time %ldus\n",
 829                        argv[0], argv[1], argv[2],
 830                        (long)ktime_us_delta(end, start));
 831                        rc = 0;
 832         }
 833
 834         return rc;
 835 }
 836
 837 /** Process configuration commands given in lustre_cfg form.
 838  * These may come from direct calls (e.g. class_manual_cleanup)
 839  * or processing the config llog, or ioctl from lctl.
 840  */
 841 int class_process_config(struct lustre_cfg *lcfg)
 842 {
 843         struct obd_device *obd;
 844         int err;
 845
 846         LASSERT(lcfg && !IS_ERR(lcfg));
 847         CDEBUG(D_IOCTL, "processing cmd: %x\n", lcfg->lcfg_command);
 848
 849         /* Commands that don't need a device */
 850         switch (lcfg->lcfg_command) {
 851         case LCFG_ATTACH: {
 852                 err = class_attach(lcfg);
 853                 goto out;
 854         }
 855         case LCFG_ADD_UUID: {
 856                 CDEBUG(D_IOCTL, "adding mapping from uuid %s to nid %#llx (%s)\n",
 857                        lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid,
 858                        libcfs_nid2str(lcfg->lcfg_nid));
 859
 860                 err = class_add_uuid(lustre_cfg_string(lcfg, 1), lcfg->lcfg_nid);
 861                 goto out;
 862         }
 863         case LCFG_DEL_UUID: {
 864                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
 865                        (lcfg->lcfg_bufcount < 2 || LUSTRE_CFG_BUFLEN(lcfg, 1) == 0)
 866                        ? "<all uuids>" : lustre_cfg_string(lcfg, 1));
 867
 868                 err = class_del_uuid(lustre_cfg_string(lcfg, 1));
 869                 goto out;
 870         }
 871         case LCFG_MOUNTOPT: {
 872                 CDEBUG(D_IOCTL, "mountopt: profile %s osc %s mdc %s\n",
 873                        lustre_cfg_string(lcfg, 1),
 874                        lustre_cfg_string(lcfg, 2),
 875                        lustre_cfg_string(lcfg, 3));
 876                 /* set these mount options somewhere, so ll_fill_super
 877                  * can find them.
 878                  */
 879                 err = class_add_profile(LUSTRE_CFG_BUFLEN(lcfg, 1),
 880                                         lustre_cfg_string(lcfg, 1),
 881                                         LUSTRE_CFG_BUFLEN(lcfg, 2),
 882                                         lustre_cfg_string(lcfg, 2),
 883                                         LUSTRE_CFG_BUFLEN(lcfg, 3),
 884                                         lustre_cfg_string(lcfg, 3));
 885                 goto out;
 886         }
 887         case LCFG_DEL_MOUNTOPT: {
 888                 CDEBUG(D_IOCTL, "mountopt: profile %s\n",
 889                        lustre_cfg_string(lcfg, 1));
 890                 class_del_profile(lustre_cfg_string(lcfg, 1));
 891                 err = 0;
 892                 goto out;
 893         }
 894         case LCFG_SET_TIMEOUT: {
 895                 CDEBUG(D_IOCTL, "changing lustre timeout from %d to %d\n",
 896                        obd_timeout, lcfg->lcfg_num);
 897                 obd_timeout = max(lcfg->lcfg_num, 1U);
 898                 obd_timeout_set = 1;
 899                 err = 0;
 900                 goto out;
 901         }
 902         case LCFG_SET_LDLM_TIMEOUT: {
 903                 /* ldlm_timeout is not used on the client */
 904                 err = 0;
 905                 goto out;
 906         }
 907         case LCFG_SET_UPCALL: {
 908                 LCONSOLE_ERROR_MSG(0x15a, "recovery upcall is deprecated\n");
 909                 /* COMPAT_146 Don't fail on old configs */
 910                 err = 0;
 911                 goto out;
 912         }
 913         case LCFG_MARKER: {
 914                 struct cfg_marker *marker;
 915
 916                 marker = lustre_cfg_buf(lcfg, 1);
 917                 CDEBUG(D_IOCTL, "marker %d (%#x) %.16s %s\n", marker->cm_step,
 918                        marker->cm_flags, marker->cm_tgtname, marker->cm_comment);
 919                 err = 0;
 920                 goto out;
 921         }
 922         case LCFG_PARAM: {
 923                 char *tmp;
 924                 /* llite has no obd */
 925                 if ((class_match_param(lustre_cfg_string(lcfg, 1),
 926                                        PARAM_LLITE, NULL) == 0) &&
 927                     client_process_config) {
 928                         err = (*client_process_config)(lcfg);
 929                         goto out;
 930                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
 931                                               PARAM_SYS, &tmp) == 0)) {
 932                         /* Global param settings */
 933                         err = class_set_global(tmp, lcfg->lcfg_num, lcfg);
 934                         /*
 935                          * Client or server should not fail to mount if
 936                          * it hits an unknown configuration parameter.
 937                          */
 938                         if (err != 0)
 939                                 CWARN("Ignoring unknown param %s\n", tmp);
 940
 941                         err = 0;
 942                         goto out;
 943                 } else if ((class_match_param(lustre_cfg_string(lcfg, 1),
 944                                               PARAM_QUOTA, &tmp) == 0) &&
 945                            quota_process_config) {
 946                         err = (*quota_process_config)(lcfg);
 947                         goto out;
 948                 }
 949
 950                 break;
 951         }
 952         case LCFG_SET_PARAM: {
 953                 err = process_param2_config(lcfg);
 954                 goto out;
 955         }
 956         }
 957         /* Commands that require a device */
 958         obd = class_name2obd(lustre_cfg_string(lcfg, 0));
 959         if (!obd) {
 960                 if (!LUSTRE_CFG_BUFLEN(lcfg, 0))
 961                         CERROR("this lcfg command requires a device name\n");
 962                 else
 963                         CERROR("no device for: %s\n",
 964                                lustre_cfg_string(lcfg, 0));
 965
 966                 err = -EINVAL;
 967                 goto out;
 968         }
 969
 970         switch (lcfg->lcfg_command) {
 971         case LCFG_SETUP: {
 972                 err = class_setup(obd, lcfg);
 973                 goto out;
 974         }
 975         case LCFG_DETACH: {
 976                 err = class_detach(obd, lcfg);
 977                 err = 0;
 978                 goto out;
 979         }
 980         case LCFG_CLEANUP: {
 981                 err = class_cleanup(obd, lcfg);
 982                 err = 0;
 983                 goto out;
 984         }
 985         case LCFG_ADD_CONN: {
 986                 err = class_add_conn(obd, lcfg);
 987                 err = 0;
 988                 goto out;
 989         }
 990         case LCFG_DEL_CONN: {
 991                 err = class_del_conn(obd, lcfg);
 992                 err = 0;
 993                 goto out;
 994         }
 995         case LCFG_POOL_NEW: {
 996                 err = obd_pool_new(obd, lustre_cfg_string(lcfg, 2));
 997                 err = 0;
 998                 goto out;
 999         }
1000         case LCFG_POOL_ADD: {
1001                 err = obd_pool_add(obd, lustre_cfg_string(lcfg, 2),
1002                                    lustre_cfg_string(lcfg, 3));
1003                 err = 0;
1004                 goto out;
1005         }
1006         case LCFG_POOL_REM: {
1007                 err = obd_pool_rem(obd, lustre_cfg_string(lcfg, 2),
1008                                    lustre_cfg_string(lcfg, 3));
1009                 err = 0;
1010                 goto out;
1011         }
1012         case LCFG_POOL_DEL: {
1013                 err = obd_pool_del(obd, lustre_cfg_string(lcfg, 2));
1014                 err = 0;
1015                 goto out;
1016         }
1017         default: {
1018                 err = obd_process_config(obd, sizeof(*lcfg), lcfg);
1019                 goto out;
1020         }
1021         }
1022 out:
1023         if ((err < 0) && !(lcfg->lcfg_command & LCFG_REQUIRED)) {
1024                 CWARN("Ignoring error %d on optional command %#x\n", err,
1025                       lcfg->lcfg_command);
1026                 err = 0;
1027         }
1028         return err;
1029 }
1030 EXPORT_SYMBOL(class_process_config);
1031
1032 int class_process_proc_param(char *prefix, struct lprocfs_vars *lvars,
1033                              struct lustre_cfg *lcfg, void *data)
1034 {
1035         struct lprocfs_vars *var;
1036         struct file fakefile;
1037         struct seq_file fake_seqfile;
1038         char *key, *sval;
1039         int i, keylen, vallen;
1040         int matched = 0, j = 0;
1041         int rc = 0;
1042         int skip = 0;
1043
1044         if (lcfg->lcfg_command != LCFG_PARAM) {
1045                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1046                 return -EINVAL;
1047         }
1048
1049         /* fake a seq file so that var->fops->write can work... */
1050         fakefile.private_data = &fake_seqfile;
1051         fake_seqfile.private = data;
1052         /* e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
1053          * or   lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
1054          * or   lctl conf_param lustre-OST0000.osc.max_dirty_mb=36
1055          */
1056         for (i = 1; i < lcfg->lcfg_bufcount; i++) {
1057                 key = lustre_cfg_buf(lcfg, i);
1058                 /* Strip off prefix */
1059                 if (class_match_param(key, prefix, &key)) {
1060                         /*
1061                          * If the prefix doesn't match, return error so we
1062                          * can pass it down the stack
1063                          */
1064                         return -ENOSYS;
1065                 }
1066                 sval = strchr(key, '=');
1067                 if (!sval || (*(sval + 1) == 0)) {
1068                         CERROR("Can't parse param %s (missing '=')\n", key);
1069                         /* rc = -EINVAL;        continue parsing other params */
1070                         continue;
1071                 }
1072                 keylen = sval - key;
1073                 sval++;
1074                 vallen = strlen(sval);
1075                 matched = 0;
1076                 j = 0;
1077                 /* Search proc entries */
1078                 while (lvars[j].name) {
1079                         var = &lvars[j];
1080                         if (!class_match_param(key, var->name, NULL) &&
1081                             keylen == strlen(var->name)) {
1082                                 matched++;
1083                                 rc = -EROFS;
1084                                 if (var->fops && var->fops->write) {
1085                                         mm_segment_t oldfs;
1086
1087                                         oldfs = get_fs();
1088                                         set_fs(KERNEL_DS);
1089                                         rc = var->fops->write(&fakefile,
1090                                                 (const char __user *)sval,
1091                                                                 vallen, NULL);
1092                                         set_fs(oldfs);
1093                                 }
1094                                 break;
1095                         }
1096                         j++;
1097                 }
1098                 if (!matched) {
1099                         CERROR("%.*s: %s unknown param %s\n",
1100                                (int)strlen(prefix) - 1, prefix,
1101                                (char *)lustre_cfg_string(lcfg, 0), key);
1102                         /* rc = -EINVAL;        continue parsing other params */
1103                         skip++;
1104                 } else if (rc < 0) {
1105                         CERROR("%s: error writing proc entry '%s': rc = %d\n",
1106                                prefix, var->name, rc);
1107                         rc = 0;
1108                 } else {
1109                         CDEBUG(D_CONFIG, "%s.%.*s: Set parameter %.*s=%s\n",
1110                                lustre_cfg_string(lcfg, 0),
1111                                (int)strlen(prefix) - 1, prefix,
1112                                (int)(sval - key - 1), key, sval);
1113                 }
1114         }
1115
1116         if (rc > 0)
1117                 rc = 0;
1118         if (!rc && skip)
1119                 rc = skip;
1120         return rc;
1121 }
1122 EXPORT_SYMBOL(class_process_proc_param);
1123
1124 /** Parse a configuration llog, doing various manipulations on them
1125  * for various reasons, (modifications for compatibility, skip obsolete
1126  * records, change uuids, etc), then class_process_config() resulting
1127  * net records.
1128  */
1129 int class_config_llog_handler(const struct lu_env *env,
1130                               struct llog_handle *handle,
1131                               struct llog_rec_hdr *rec, void *data)
1132 {
1133         struct config_llog_instance *clli = data;
1134         int cfg_len = rec->lrh_len;
1135         char *cfg_buf = (char *)(rec + 1);
1136         int rc = 0;
1137
1138         switch (rec->lrh_type) {
1139         case OBD_CFG_REC: {
1140                 struct lustre_cfg *lcfg, *lcfg_new;
1141                 struct lustre_cfg_bufs bufs;
1142                 char *inst_name = NULL;
1143                 int inst_len = 0;
1144                 size_t lcfg_len;
1145                 int swab = 0;
1146
1147                 lcfg = (struct lustre_cfg *)cfg_buf;
1148                 if (lcfg->lcfg_version == __swab32(LUSTRE_CFG_VERSION)) {
1149                         lustre_swab_lustre_cfg(lcfg);
1150                         swab = 1;
1151                 }
1152
1153                 rc = lustre_cfg_sanity_check(cfg_buf, cfg_len);
1154                 if (rc)
1155                         goto out;
1156
1157                 /* Figure out config state info */
1158                 if (lcfg->lcfg_command == LCFG_MARKER) {
1159                         struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1160
1161                         lustre_swab_cfg_marker(marker, swab,
1162                                                LUSTRE_CFG_BUFLEN(lcfg, 1));
1163                         CDEBUG(D_CONFIG, "Marker, inst_flg=%#x mark_flg=%#x\n",
1164                                clli->cfg_flags, marker->cm_flags);
1165                         if (marker->cm_flags & CM_START) {
1166                                 /* all previous flags off */
1167                                 clli->cfg_flags = CFG_F_MARKER;
1168                                 if (marker->cm_flags & CM_SKIP) {
1169                                         clli->cfg_flags |= CFG_F_SKIP;
1170                                         CDEBUG(D_CONFIG, "SKIP #%d\n",
1171                                                marker->cm_step);
1172                                 } else if ((marker->cm_flags & CM_EXCLUDE) ||
1173                                            (clli->cfg_sb &&
1174                                             lustre_check_exclusion(clli->cfg_sb,
1175                                                          marker->cm_tgtname))) {
1176                                         clli->cfg_flags |= CFG_F_EXCLUDE;
1177                                         CDEBUG(D_CONFIG, "EXCLUDE %d\n",
1178                                                marker->cm_step);
1179                                 }
1180                         } else if (marker->cm_flags & CM_END) {
1181                                 clli->cfg_flags = 0;
1182                         }
1183                 }
1184                 /* A config command without a start marker before it is
1185                  * illegal (post 146)
1186                  */
1187                 if (!(clli->cfg_flags & CFG_F_COMPAT146) &&
1188                     !(clli->cfg_flags & CFG_F_MARKER) &&
1189                     (lcfg->lcfg_command != LCFG_MARKER)) {
1190                         CWARN("Config not inside markers, ignoring! (inst: %p, uuid: %s, flags: %#x)\n",
1191                               clli->cfg_instance,
1192                               clli->cfg_uuid.uuid, clli->cfg_flags);
1193                         clli->cfg_flags |= CFG_F_SKIP;
1194                 }
1195                 if (clli->cfg_flags & CFG_F_SKIP) {
1196                         CDEBUG(D_CONFIG, "skipping %#x\n",
1197                                clli->cfg_flags);
1198                         rc = 0;
1199                         /* No processing! */
1200                         break;
1201                 }
1202
1203                 /*
1204                  * For interoperability between 1.8 and 2.0,
1205                  * rename "mds" obd device type to "mdt".
1206                  */
1207                 {
1208                         char *typename = lustre_cfg_string(lcfg, 1);
1209                         char *index = lustre_cfg_string(lcfg, 2);
1210
1211                         if ((lcfg->lcfg_command == LCFG_ATTACH && typename &&
1212                              strcmp(typename, "mds") == 0)) {
1213                                 CWARN("For 1.8 interoperability, rename obd type from mds to mdt\n");
1214                                 typename[2] = 't';
1215                         }
1216                         if ((lcfg->lcfg_command == LCFG_SETUP && index &&
1217                              strcmp(index, "type") == 0)) {
1218                                 CDEBUG(D_INFO, "For 1.8 interoperability, set this index to '0'\n");
1219                                 index[0] = '0';
1220                                 index[1] = 0;
1221                         }
1222                 }
1223
1224                 if (clli->cfg_flags & CFG_F_EXCLUDE) {
1225                         CDEBUG(D_CONFIG, "cmd: %x marked EXCLUDED\n",
1226                                lcfg->lcfg_command);
1227                         if (lcfg->lcfg_command == LCFG_LOV_ADD_OBD)
1228                                 /* Add inactive instead */
1229                                 lcfg->lcfg_command = LCFG_LOV_ADD_INA;
1230                 }
1231
1232                 lustre_cfg_bufs_init(&bufs, lcfg);
1233
1234                 if (clli && clli->cfg_instance &&
1235                     LUSTRE_CFG_BUFLEN(lcfg, 0) > 0) {
1236                         inst_len = LUSTRE_CFG_BUFLEN(lcfg, 0) +
1237                                    sizeof(clli->cfg_instance) * 2 + 4;
1238                         inst_name = kasprintf(GFP_NOFS, "%s-%p",
1239                                               lustre_cfg_string(lcfg, 0),
1240                                               clli->cfg_instance);
1241                         if (!inst_name) {
1242                                 rc = -ENOMEM;
1243                                 goto out;
1244                         }
1245                         lustre_cfg_bufs_set_string(&bufs, 0, inst_name);
1246                         CDEBUG(D_CONFIG, "cmd %x, instance name: %s\n",
1247                                lcfg->lcfg_command, inst_name);
1248                 }
1249
1250                 /* we override the llog's uuid for clients, to insure they
1251                  * are unique
1252                  */
1253                 if (clli && clli->cfg_instance &&
1254                     lcfg->lcfg_command == LCFG_ATTACH) {
1255                         lustre_cfg_bufs_set_string(&bufs, 2,
1256                                                    clli->cfg_uuid.uuid);
1257                 }
1258                 /*
1259                  * sptlrpc config record, we expect 2 data segments:
1260                  *  [0]: fs_name/target_name,
1261                  *  [1]: rule string
1262                  * moving them to index [1] and [2], and insert MGC's
1263                  * obdname at index [0].
1264                  */
1265                 if (clli && !clli->cfg_instance &&
1266                     lcfg->lcfg_command == LCFG_SPTLRPC_CONF) {
1267                         lustre_cfg_bufs_set(&bufs, 2, bufs.lcfg_buf[1],
1268                                             bufs.lcfg_buflen[1]);
1269                         lustre_cfg_bufs_set(&bufs, 1, bufs.lcfg_buf[0],
1270                                             bufs.lcfg_buflen[0]);
1271                         lustre_cfg_bufs_set_string(&bufs, 0,
1272                                                    clli->cfg_obdname);
1273                 }
1274
1275                 lcfg_len = lustre_cfg_len(bufs.lcfg_bufcount, bufs.lcfg_buflen);
1276                 lcfg_new = kzalloc(lcfg_len, GFP_NOFS);
1277                 if (!lcfg_new) {
1278                         rc = -ENOMEM;
1279                         goto out;
1280                 }
1281
1282                 lustre_cfg_init(lcfg_new, lcfg->lcfg_command, &bufs);
1283                 lcfg_new->lcfg_num   = lcfg->lcfg_num;
1284                 lcfg_new->lcfg_flags = lcfg->lcfg_flags;
1285
1286                 /* XXX Hack to try to remain binary compatible with
1287                  * pre-newconfig logs
1288                  */
1289                 if (lcfg->lcfg_nal != 0 &&      /* pre-newconfig log? */
1290                     (lcfg->lcfg_nid >> 32) == 0) {
1291                         __u32 addr = (__u32)(lcfg->lcfg_nid & 0xffffffff);
1292
1293                         lcfg_new->lcfg_nid =
1294                                 LNET_MKNID(LNET_MKNET(lcfg->lcfg_nal, 0), addr);
1295                         CWARN("Converted pre-newconfig NAL %d NID %x to %s\n",
1296                               lcfg->lcfg_nal, addr,
1297                               libcfs_nid2str(lcfg_new->lcfg_nid));
1298                 } else {
1299                         lcfg_new->lcfg_nid = lcfg->lcfg_nid;
1300                 }
1301
1302                 lcfg_new->lcfg_nal = 0; /* illegal value for obsolete field */
1303
1304                 rc = class_process_config(lcfg_new);
1305                 kfree(lcfg_new);
1306                 kfree(inst_name);
1307                 break;
1308         }
1309         default:
1310                 CERROR("Unknown llog record type %#x encountered\n",
1311                        rec->lrh_type);
1312                 break;
1313         }
1314 out:
1315         if (rc) {
1316                 CERROR("%s: cfg command failed: rc = %d\n",
1317                        handle->lgh_ctxt->loc_obd->obd_name, rc);
1318                 class_config_dump_handler(NULL, handle, rec, data);
1319         }
1320         return rc;
1321 }
1322 EXPORT_SYMBOL(class_config_llog_handler);
1323
1324 int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
1325                             char *name, struct config_llog_instance *cfg)
1326 {
1327         struct llog_process_cat_data     cd = {0, 0};
1328         struct llog_handle              *llh;
1329         llog_cb_t                        callback;
1330         int                              rc;
1331
1332         CDEBUG(D_INFO, "looking up llog %s\n", name);
1333         rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
1334         if (rc)
1335                 return rc;
1336
1337         rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
1338         if (rc)
1339                 goto parse_out;
1340
1341         /* continue processing from where we last stopped to end-of-log */
1342         if (cfg) {
1343                 cd.lpcd_first_idx = cfg->cfg_last_idx;
1344                 callback = cfg->cfg_callback;
1345                 LASSERT(callback);
1346         } else {
1347                 callback = class_config_llog_handler;
1348         }
1349
1350         cd.lpcd_last_idx = 0;
1351
1352         rc = llog_process(env, llh, callback, cfg, &cd);
1353
1354         CDEBUG(D_CONFIG, "Processed log %s gen %d-%d (rc=%d)\n", name,
1355                cd.lpcd_first_idx + 1, cd.lpcd_last_idx, rc);
1356         if (cfg)
1357                 cfg->cfg_last_idx = cd.lpcd_last_idx;
1358
1359 parse_out:
1360         llog_close(env, llh);
1361         return rc;
1362 }
1363 EXPORT_SYMBOL(class_config_parse_llog);
1364
1365 /**
1366  * parse config record and output dump in supplied buffer.
1367  * This is separated from class_config_dump_handler() to use
1368  * for ioctl needs as well
1369  */
1370 static int class_config_parse_rec(struct llog_rec_hdr *rec, char *buf,
1371                                   int size)
1372 {
1373         struct lustre_cfg       *lcfg = (struct lustre_cfg *)(rec + 1);
1374         char                    *ptr = buf;
1375         char                    *end = buf + size;
1376         int                      rc = 0;
1377
1378         LASSERT(rec->lrh_type == OBD_CFG_REC);
1379         rc = lustre_cfg_sanity_check(lcfg, rec->lrh_len);
1380         if (rc < 0)
1381                 return rc;
1382
1383         ptr += snprintf(ptr, end - ptr, "cmd=%05x ", lcfg->lcfg_command);
1384         if (lcfg->lcfg_flags)
1385                 ptr += snprintf(ptr, end - ptr, "flags=%#08x ",
1386                                 lcfg->lcfg_flags);
1387
1388         if (lcfg->lcfg_num)
1389                 ptr += snprintf(ptr, end - ptr, "num=%#08x ", lcfg->lcfg_num);
1390
1391         if (lcfg->lcfg_nid) {
1392                 char nidstr[LNET_NIDSTR_SIZE];
1393
1394                 libcfs_nid2str_r(lcfg->lcfg_nid, nidstr, sizeof(nidstr));
1395                 ptr += snprintf(ptr, end - ptr, "nid=%s(%#llx)\n     ",
1396                                 nidstr, lcfg->lcfg_nid);
1397         }
1398
1399         if (lcfg->lcfg_command == LCFG_MARKER) {
1400                 struct cfg_marker *marker = lustre_cfg_buf(lcfg, 1);
1401
1402                 ptr += snprintf(ptr, end - ptr, "marker=%d(%#x)%s '%s'",
1403                                 marker->cm_step, marker->cm_flags,
1404                                 marker->cm_tgtname, marker->cm_comment);
1405         } else {
1406                 int i;
1407
1408                 for (i = 0; i <  lcfg->lcfg_bufcount; i++) {
1409                         ptr += snprintf(ptr, end - ptr, "%d:%s  ", i,
1410                                         lustre_cfg_string(lcfg, i));
1411                 }
1412         }
1413         ptr += snprintf(ptr, end - ptr, "\n");
1414         /* return consumed bytes */
1415         rc = ptr - buf;
1416         return rc;
1417 }
1418
1419 int class_config_dump_handler(const struct lu_env *env,
1420                               struct llog_handle *handle,
1421                               struct llog_rec_hdr *rec, void *data)
1422 {
1423         char    *outstr;
1424         int      rc = 0;
1425
1426         outstr = kzalloc(256, GFP_NOFS);
1427         if (!outstr)
1428                 return -ENOMEM;
1429
1430         if (rec->lrh_type == OBD_CFG_REC) {
1431                 class_config_parse_rec(rec, outstr, 256);
1432                 LCONSOLE(D_WARNING, "   %s", outstr);
1433         } else {
1434                 LCONSOLE(D_WARNING, "unhandled lrh_type: %#x\n", rec->lrh_type);
1435                 rc = -EINVAL;
1436         }
1437
1438         kfree(outstr);
1439         return rc;
1440 }
1441
1442 /** Call class_cleanup and class_detach.
1443  * "Manual" only in the sense that we're faking lcfg commands.
1444  */
1445 int class_manual_cleanup(struct obd_device *obd)
1446 {
1447         char                flags[3] = "";
1448         struct lustre_cfg      *lcfg;
1449         struct lustre_cfg_bufs  bufs;
1450         int                  rc;
1451
1452         if (!obd) {
1453                 CERROR("empty cleanup\n");
1454                 return -EALREADY;
1455         }
1456
1457         if (obd->obd_force)
1458                 strcat(flags, "F");
1459         if (obd->obd_fail)
1460                 strcat(flags, "A");
1461
1462         CDEBUG(D_CONFIG, "Manual cleanup of %s (flags='%s')\n",
1463                obd->obd_name, flags);
1464
1465         lustre_cfg_bufs_reset(&bufs, obd->obd_name);
1466         lustre_cfg_bufs_set_string(&bufs, 1, flags);
1467         lcfg = kzalloc(lustre_cfg_len(bufs.lcfg_bufcount, bufs.lcfg_buflen),
1468                         GFP_NOFS);
1469         if (!lcfg)
1470                 return -ENOMEM;
1471         lustre_cfg_init(lcfg, LCFG_CLEANUP, &bufs);
1472
1473         rc = class_process_config(lcfg);
1474         if (rc) {
1475                 CERROR("cleanup failed %d: %s\n", rc, obd->obd_name);
1476                 goto out;
1477         }
1478
1479         /* the lcfg is almost the same for both ops */
1480         lcfg->lcfg_command = LCFG_DETACH;
1481         rc = class_process_config(lcfg);
1482         if (rc)
1483                 CERROR("detach failed %d: %s\n", rc, obd->obd_name);
1484 out:
1485         kfree(lcfg);
1486         return rc;
1487 }
1488 EXPORT_SYMBOL(class_manual_cleanup);
1489
1490 /*
1491  * uuid<->export lustre hash operations
1492  */
1493
1494 static unsigned int
1495 uuid_hash(struct cfs_hash *hs, const void *key, unsigned int mask)
1496 {
1497         return cfs_hash_djb2_hash(((struct obd_uuid *)key)->uuid,
1498                                   sizeof(((struct obd_uuid *)key)->uuid), mask);
1499 }
1500
1501 static void *
1502 uuid_key(struct hlist_node *hnode)
1503 {
1504         struct obd_export *exp;
1505
1506         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1507
1508         return &exp->exp_client_uuid;
1509 }
1510
1511 /*
1512  * NOTE: It is impossible to find an export that is in failed
1513  *       state with this function
1514  */
1515 static int
1516 uuid_keycmp(const void *key, struct hlist_node *hnode)
1517 {
1518         struct obd_export *exp;
1519
1520         LASSERT(key);
1521         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1522
1523         return obd_uuid_equals(key, &exp->exp_client_uuid) &&
1524                !exp->exp_failed;
1525 }
1526
1527 static void *
1528 uuid_export_object(struct hlist_node *hnode)
1529 {
1530         return hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1531 }
1532
1533 static void
1534 uuid_export_get(struct cfs_hash *hs, struct hlist_node *hnode)
1535 {
1536         struct obd_export *exp;
1537
1538         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1539         class_export_get(exp);
1540 }
1541
1542 static void
1543 uuid_export_put_locked(struct cfs_hash *hs, struct hlist_node *hnode)
1544 {
1545         struct obd_export *exp;
1546
1547         exp = hlist_entry(hnode, struct obd_export, exp_uuid_hash);
1548         class_export_put(exp);
1549 }
1550
1551 static struct cfs_hash_ops uuid_hash_ops = {
1552         .hs_hash        = uuid_hash,
1553         .hs_key         = uuid_key,
1554         .hs_keycmp      = uuid_keycmp,
1555         .hs_object      = uuid_export_object,
1556         .hs_get         = uuid_export_get,
1557         .hs_put_locked  = uuid_export_put_locked,
1558 };