lustre/obdclass/obd_sysfs.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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/obdclass/obd_sysfs.c
  32  *
  33  * Object Devices Class Driver
  34  * These are the only exported functions, they provide some generic
  35  * infrastructure for managing object devices
  36  */
  37
  38 #define DEBUG_SUBSYSTEM S_CLASS
  39
  40 #include <linux/module.h>
  41 #include <linux/errno.h>
  42 #include <linux/kernel.h>
  43 #include <linux/sched.h>
  44 #include <linux/lp.h>
  45 #include <linux/slab.h>
  46 #include <linux/ioport.h>
  47 #include <linux/fcntl.h>
  48 #include <linux/delay.h>
  49 #include <linux/skbuff.h>
  50 #include <linux/proc_fs.h>
  51 #include <linux/fs.h>
  52 #include <linux/poll.h>
  53 #include <linux/init.h>
  54 #include <linux/list.h>
  55 #include <linux/highmem.h>
  56 #include <asm/io.h>
  57 #include <asm/ioctls.h>
  58 #include <asm/poll.h>
  59 #include <asm/uaccess.h>
  60 #include <linux/miscdevice.h>
  61 #include <linux/seq_file.h>
  62 #include <linux/kobject.h>
  63
  64 #include <libcfs/libcfs.h>
  65 #include <libcfs/libcfs_crypto.h>
  66 #include <obd_support.h>
  67 #include <obd_class.h>
  68 #include <lprocfs_status.h>
  69 #include <uapi/linux/lnet/lnetctl.h>
  70 #include <uapi/linux/lustre/lustre_ioctl.h>
  71 #include <uapi/linux/lustre/lustre_ver.h>
  72
  73 struct static_lustre_uintvalue_attr {
  74         struct {
  75                 struct attribute attr;
  76                 ssize_t (*show)(struct kobject *kobj, struct attribute *attr,
  77                                 char *buf);
  78                 ssize_t (*store)(struct kobject *kobj, struct attribute *attr,
  79                                  const char *buf, size_t len);
  80         } u;
  81         int *value;
  82 };
  83
  84 static ssize_t static_uintvalue_show(struct kobject *kobj,
  85                                      struct attribute *attr,
  86                                      char *buf)
  87 {
  88         struct static_lustre_uintvalue_attr *lattr = (void *)attr;
  89
  90         return sprintf(buf, "%d\n", *lattr->value);
  91 }
  92
  93 static ssize_t static_uintvalue_store(struct kobject *kobj,
  94                                       struct attribute *attr,
  95                                       const char *buffer, size_t count)
  96 {
  97         struct static_lustre_uintvalue_attr *lattr = (void *)attr;
  98         unsigned int val;
  99         int rc;
 100
 101         rc = kstrtouint(buffer, 10, &val);
 102         if (rc)
 103                 return rc;
 104
 105         *lattr->value = val;
 106
 107         return count;
 108 }
 109
 110 #define LUSTRE_STATIC_UINT_ATTR(name, value)                            \
 111 static struct static_lustre_uintvalue_attr lustre_sattr_##name =        \
 112         { __ATTR(name, 0644, static_uintvalue_show,                     \
 113                  static_uintvalue_store), value }
 114
 115 LUSTRE_STATIC_UINT_ATTR(debug_peer_on_timeout, &obd_debug_peer_on_timeout);
 116 LUSTRE_STATIC_UINT_ATTR(dump_on_timeout, &obd_dump_on_timeout);
 117 LUSTRE_STATIC_UINT_ATTR(dump_on_eviction, &obd_dump_on_eviction);
 118 LUSTRE_STATIC_UINT_ATTR(at_min, &at_min);
 119 LUSTRE_STATIC_UINT_ATTR(at_max, &at_max);
 120 LUSTRE_STATIC_UINT_ATTR(at_extra, &at_extra);
 121 LUSTRE_STATIC_UINT_ATTR(at_early_margin, &at_early_margin);
 122 LUSTRE_STATIC_UINT_ATTR(at_history, &at_history);
 123 LUSTRE_STATIC_UINT_ATTR(lbug_on_eviction, &obd_lbug_on_eviction);
 124 LUSTRE_STATIC_UINT_ATTR(ping_interval, &ping_interval);
 125 LUSTRE_STATIC_UINT_ATTR(evict_multiplier, &ping_evict_timeout_multiplier);
 126
 127 #ifdef HAVE_SERVER_SUPPORT
 128 LUSTRE_STATIC_UINT_ATTR(ldlm_timeout, &ldlm_timeout);
 129 LUSTRE_STATIC_UINT_ATTR(bulk_timeout, &bulk_timeout);
 130 #endif
 131
 132 static ssize_t memused_show(struct kobject *kobj, struct attribute *attr,
 133                             char *buf)
 134 {
 135         return sprintf(buf, "%llu\n", obd_memory_sum());
 136 }
 137 LUSTRE_RO_ATTR(memused);
 138
 139 static ssize_t memused_max_show(struct kobject *kobj, struct attribute *attr,
 140                                 char *buf)
 141 {
 142         return sprintf(buf, "%llu\n", obd_memory_max());
 143 }
 144 LUSTRE_RO_ATTR(memused_max);
 145
 146 static ssize_t max_dirty_mb_show(struct kobject *kobj, struct attribute *attr,
 147                                  char *buf)
 148 {
 149         return sprintf(buf, "%lu\n",
 150                        obd_max_dirty_pages / (1 << (20 - PAGE_SHIFT)));
 151 }
 152
 153 static ssize_t max_dirty_mb_store(struct kobject *kobj, struct attribute *attr,
 154                                   const char *buffer, size_t count)
 155 {
 156         unsigned long val;
 157         int rc;
 158
 159         rc = kstrtoul(buffer, 10, &val);
 160         if (rc)
 161                 return rc;
 162
 163         val *= 1 << (20 - PAGE_SHIFT); /* convert to pages */
 164
 165         if (val > ((cfs_totalram_pages() / 10) * 9)) {
 166                 /* Somebody wants to assign too much memory to dirty pages */
 167                 return -EINVAL;
 168         }
 169
 170         if (val < 4 << (20 - PAGE_SHIFT)) {
 171                 /* Less than 4 Mb for dirty cache is also bad */
 172                 return -EINVAL;
 173         }
 174
 175         obd_max_dirty_pages = val;
 176
 177         return count;
 178 }
 179 LUSTRE_RW_ATTR(max_dirty_mb);
 180
 181 #ifdef HAVE_SERVER_SUPPORT
 182 static ssize_t no_transno_store(struct kobject *kobj,
 183                                 struct attribute *attr,
 184                                 const char *buffer, size_t count)
 185 {
 186         struct obd_device *obd;
 187         unsigned int idx;
 188         int rc;
 189
 190         rc = kstrtouint(buffer, 10, &idx);
 191         if (rc)
 192                 return rc;
 193
 194         obd = class_num2obd(idx);
 195         if (!obd || !obd->obd_attached) {
 196                 if (obd)
 197                         CERROR("%s: not attached\n", obd->obd_name);
 198                 return -ENODEV;
 199         }
 200
 201         spin_lock(&obd->obd_dev_lock);
 202         obd->obd_no_transno = 1;
 203         spin_unlock(&obd->obd_dev_lock);
 204         return count;
 205 }
 206 LUSTRE_WO_ATTR(no_transno);
 207 #endif /* HAVE_SERVER_SUPPORT */
 208
 209 static ssize_t version_show(struct kobject *kobj, struct attribute *attr,
 210                             char *buf)
 211 {
 212         return sprintf(buf, "%s\n", LUSTRE_VERSION_STRING);
 213 }
 214
 215 static ssize_t pinger_show(struct kobject *kobj, struct attribute *attr,
 216                            char *buf)
 217 {
 218 #ifdef CONFIG_LUSTRE_FS_PINGER
 219         const char *state = "on";
 220 #else
 221         const char *state = "off";
 222 #endif
 223         return sprintf(buf, "%s\n", state);
 224 }
 225
 226 /**
 227  * Check all obd devices health
 228  *
 229  * \param kobj
 230  * \param buf [in]
 231  *
 232  * \retval number of characters printed if healthy
 233  */
 234 static ssize_t
 235 health_check_show(struct kobject *kobj, struct attribute *attr, char *buf)
 236 {
 237         bool healthy = true;
 238         size_t len = 0;
 239         int i;
 240
 241         if (libcfs_catastrophe)
 242                 return sprintf(buf, "LBUG\n");
 243
 244         read_lock(&obd_dev_lock);
 245         for (i = 0; i < class_devno_max(); i++) {
 246                 struct obd_device *obd;
 247
 248                 obd = class_num2obd(i);
 249                 if (obd == NULL || !obd->obd_attached || !obd->obd_set_up)
 250                         continue;
 251
 252                 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 253                 if (obd->obd_stopping)
 254                         continue;
 255
 256                 if (obd->obd_read_only)
 257                         continue;
 258
 259                 class_incref(obd, __func__, current);
 260                 read_unlock(&obd_dev_lock);
 261
 262                 if (obd_health_check(NULL, obd))
 263                         healthy = false;
 264
 265                 class_decref(obd, __func__, current);
 266                 read_lock(&obd_dev_lock);
 267
 268                 if (!healthy)
 269                         break;
 270         }
 271         read_unlock(&obd_dev_lock);
 272
 273         if (healthy)
 274                 len = sprintf(buf, "healthy\n");
 275         else
 276                 len = sprintf(buf, "NOT HEALTHY\n");
 277
 278         return len;
 279 }
 280
 281 static ssize_t jobid_var_show(struct kobject *kobj, struct attribute *attr,
 282                               char *buf)
 283 {
 284         int rc = 0;
 285
 286         if (strlen(obd_jobid_var))
 287                 rc = scnprintf(buf, PAGE_SIZE, "%s\n", obd_jobid_var);
 288         return rc;
 289 }
 290
 291 static ssize_t jobid_var_store(struct kobject *kobj, struct attribute *attr,
 292                                const char *buffer, size_t count)
 293 {
 294         if (!count || count > JOBSTATS_JOBID_VAR_MAX_LEN)
 295                 return -EINVAL;
 296
 297         memset(obd_jobid_var, 0, JOBSTATS_JOBID_VAR_MAX_LEN + 1);
 298
 299         memcpy(obd_jobid_var, buffer, count);
 300
 301         /* Trim the trailing '\n' if any */
 302         if (obd_jobid_var[count - 1] == '\n')
 303                 obd_jobid_var[count - 1] = 0;
 304
 305         return count;
 306 }
 307
 308 static ssize_t jobid_name_show(struct kobject *kobj, struct attribute *attr,
 309                                char *buf)
 310 {
 311         int rc = 0;
 312
 313         if (strlen(obd_jobid_name))
 314                 rc = scnprintf(buf, PAGE_SIZE, "%s\n", obd_jobid_name);
 315         return rc;
 316 }
 317
 318 static ssize_t jobid_name_store(struct kobject *kobj, struct attribute *attr,
 319                                 const char *buffer, size_t count)
 320 {
 321         if (!count || count > LUSTRE_JOBID_SIZE)
 322                 return -EINVAL;
 323
 324         if (strcmp(obd_jobid_var, JOBSTATS_NODELOCAL) != 0 &&
 325             !strchr(buffer, '%')) {
 326                 lustre_jobid_clear(buffer);
 327                 return count;
 328         }
 329
 330         /* clear previous value */
 331         memset(obd_jobid_name, 0, LUSTRE_JOBID_SIZE);
 332
 333         memcpy(obd_jobid_name, buffer, count);
 334
 335         /* Trim the trailing '\n' if any */
 336         if (obd_jobid_name[count - 1] == '\n') {
 337                 /* Don't echo just a newline */
 338                 if (count == 1)
 339                         return -EINVAL;
 340                 obd_jobid_name[count - 1] = 0;
 341         }
 342
 343         return count;
 344 }
 345
 346 static ssize_t jobid_this_session_show(struct kobject *kobj,
 347                                        struct attribute *attr,
 348                                        char *buf)
 349 {
 350         char *jid;
 351         int ret = -ENOENT;
 352
 353         rcu_read_lock();
 354         jid = jobid_current();
 355         if (jid)
 356                 ret = scnprintf(buf, PAGE_SIZE, "%s\n", jid);
 357         rcu_read_unlock();
 358         return ret;
 359 }
 360
 361 static ssize_t jobid_this_session_store(struct kobject *kobj,
 362                                         struct attribute *attr,
 363                                         const char *buffer,
 364                                         size_t count)
 365 {
 366         char *jobid;
 367         int len;
 368         int ret;
 369
 370         if (!count || count > LUSTRE_JOBID_SIZE)
 371                 return -EINVAL;
 372
 373         jobid = kstrndup(buffer, count, GFP_KERNEL);
 374         if (!jobid)
 375                 return -ENOMEM;
 376         len = strcspn(jobid, "\n ");
 377         jobid[len] = '\0';
 378         ret = jobid_set_current(jobid);
 379         kfree(jobid);
 380
 381         return ret ?: count;
 382 }
 383
 384 static ssize_t timeout_show(struct kobject *kobj,
 385                             struct attribute *attr,
 386                             char *buf)
 387 {
 388         return sprintf(buf, "%u\n", obd_timeout);
 389 }
 390
 391 static ssize_t timeout_store(struct kobject *kobj,
 392                              struct attribute *attr,
 393                              const char *buffer,
 394                              size_t count)
 395 {
 396         unsigned int val;
 397         int rc;
 398
 399         rc = kstrtouint(buffer, 10, &val);
 400         if (rc)
 401                 return rc;
 402         obd_timeout = val ?: 1U;
 403         ping_interval = max(obd_timeout / 4, 1U);
 404
 405         return count;
 406 }
 407
 408 /* Root for /sys/kernel/debug/lustre */
 409 struct dentry *debugfs_lustre_root;
 410 EXPORT_SYMBOL_GPL(debugfs_lustre_root);
 411
 412 #ifdef CONFIG_PROC_FS
 413 /* Root for /proc/fs/lustre */
 414 struct proc_dir_entry *proc_lustre_root;
 415 EXPORT_SYMBOL(proc_lustre_root);
 416 #else
 417 #define lprocfs_base NULL
 418 #endif /* CONFIG_PROC_FS */
 419
 420 LUSTRE_RO_ATTR(version);
 421 LUSTRE_RO_ATTR(pinger);
 422 LUSTRE_RO_ATTR(health_check);
 423 LUSTRE_RW_ATTR(jobid_var);
 424 LUSTRE_RW_ATTR(jobid_name);
 425 LUSTRE_RW_ATTR(jobid_this_session);
 426 LUSTRE_RW_ATTR(timeout);
 427
 428 static struct attribute *lustre_attrs[] = {
 429         &lustre_attr_version.attr,
 430         &lustre_attr_pinger.attr,
 431         &lustre_attr_health_check.attr,
 432         &lustre_attr_jobid_name.attr,
 433         &lustre_attr_jobid_var.attr,
 434         &lustre_attr_jobid_this_session.attr,
 435         &lustre_attr_timeout.attr,
 436         &lustre_attr_max_dirty_mb.attr,
 437         &lustre_sattr_debug_peer_on_timeout.u.attr,
 438         &lustre_sattr_dump_on_timeout.u.attr,
 439         &lustre_sattr_dump_on_eviction.u.attr,
 440         &lustre_sattr_at_min.u.attr,
 441         &lustre_sattr_at_max.u.attr,
 442         &lustre_sattr_at_extra.u.attr,
 443         &lustre_sattr_at_early_margin.u.attr,
 444         &lustre_sattr_at_history.u.attr,
 445         &lustre_attr_memused_max.attr,
 446         &lustre_attr_memused.attr,
 447 #ifdef HAVE_SERVER_SUPPORT
 448         &lustre_sattr_ldlm_timeout.u.attr,
 449         &lustre_sattr_bulk_timeout.u.attr,
 450         &lustre_attr_no_transno.attr,
 451 #endif
 452         &lustre_sattr_lbug_on_eviction.u.attr,
 453         &lustre_sattr_ping_interval.u.attr,
 454         &lustre_sattr_evict_multiplier.u.attr,
 455         NULL,
 456 };
 457
 458 static void *obd_device_list_seq_start(struct seq_file *p, loff_t *pos)
 459 {
 460         if (*pos >= class_devno_max())
 461                 return NULL;
 462
 463         return pos;
 464 }
 465
 466 static void obd_device_list_seq_stop(struct seq_file *p, void *v)
 467 {
 468 }
 469
 470 static void *obd_device_list_seq_next(struct seq_file *p, void *v, loff_t *pos)
 471 {
 472         ++*pos;
 473         if (*pos >= class_devno_max())
 474                 return NULL;
 475
 476         return pos;
 477 }
 478
 479 static int obd_device_list_seq_show(struct seq_file *p, void *v)
 480 {
 481         loff_t index = *(loff_t *)v;
 482         struct obd_device *obd = class_num2obd((int)index);
 483         char *status;
 484
 485         if (obd == NULL)
 486                 return 0;
 487
 488         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 489         if (obd->obd_stopping)
 490                 status = "ST";
 491         else if (obd->obd_inactive)
 492                 status = "IN";
 493         else if (obd->obd_set_up)
 494                 status = "UP";
 495         else if (obd->obd_attached)
 496                 status = "AT";
 497         else
 498                 status = "--";
 499
 500         seq_printf(p, "%3d %s %s %s %s %d\n",
 501                    (int)index, status, obd->obd_type->typ_name,
 502                    obd->obd_name, obd->obd_uuid.uuid,
 503                    atomic_read(&obd->obd_refcount));
 504         return 0;
 505 }
 506
 507 static const struct seq_operations obd_device_list_sops = {
 508         .start = obd_device_list_seq_start,
 509         .stop = obd_device_list_seq_stop,
 510         .next = obd_device_list_seq_next,
 511         .show = obd_device_list_seq_show,
 512 };
 513
 514 static int obd_device_list_open(struct inode *inode, struct file *file)
 515 {
 516         struct seq_file *seq;
 517         int rc = seq_open(file, &obd_device_list_sops);
 518
 519         if (rc)
 520                 return rc;
 521
 522         seq = file->private_data;
 523         seq->private = inode->i_private;
 524         return 0;
 525 }
 526
 527 static const struct file_operations obd_device_list_fops = {
 528         .owner   = THIS_MODULE,
 529         .open    = obd_device_list_open,
 530         .read    = seq_read,
 531         .llseek  = seq_lseek,
 532         .release = seq_release,
 533 };
 534
 535 /* checksum_speed */
 536 static void *checksum_speed_start(struct seq_file *p, loff_t *pos)
 537 {
 538         return pos;
 539 }
 540
 541 static void checksum_speed_stop(struct seq_file *p, void *v)
 542 {
 543 }
 544
 545 static void *checksum_speed_next(struct seq_file *p, void *v, loff_t *pos)
 546 {
 547         ++(*pos);
 548         if (*pos >= CFS_HASH_ALG_SPEED_MAX - 1)
 549                 return NULL;
 550
 551         return pos;
 552 }
 553
 554 static int checksum_speed_show(struct seq_file *p, void *v)
 555 {
 556         loff_t index = *(loff_t *)v;
 557
 558         if (!index || index > CFS_HASH_ALG_SPEED_MAX - 1)
 559                 return 0;
 560
 561         seq_printf(p, "%s: %d\n", cfs_crypto_hash_name(index),
 562                    cfs_crypto_hash_speeds[index]);
 563
 564         return 0;
 565 }
 566
 567 static const struct seq_operations checksum_speed_sops = {
 568         .start = checksum_speed_start,
 569         .stop = checksum_speed_stop,
 570         .next = checksum_speed_next,
 571         .show = checksum_speed_show,
 572 };
 573
 574 static int checksum_speed_open(struct inode *inode, struct file *file)
 575 {
 576         int rc = seq_open(file, &checksum_speed_sops);
 577
 578         if (rc)
 579                 return rc;
 580
 581         return 0;
 582 }
 583
 584 static const struct file_operations checksum_speed_fops = {
 585         .owner   = THIS_MODULE,
 586         .open    = checksum_speed_open,
 587         .read    = seq_read,
 588         .llseek  = seq_lseek,
 589         .release = seq_release,
 590 };
 591
 592 static int
 593 health_check_seq_show(struct seq_file *m, void *unused)
 594 {
 595         int i;
 596
 597         read_lock(&obd_dev_lock);
 598         for (i = 0; i < class_devno_max(); i++) {
 599                 struct obd_device *obd;
 600
 601                 obd = class_num2obd(i);
 602                 if (obd == NULL || !obd->obd_attached || !obd->obd_set_up)
 603                         continue;
 604
 605                 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 606                 if (obd->obd_stopping)
 607                         continue;
 608
 609                 class_incref(obd, __func__, current);
 610                 read_unlock(&obd_dev_lock);
 611
 612                 if (obd_health_check(NULL, obd)) {
 613                         seq_printf(m, "device %s reported unhealthy\n",
 614                                    obd->obd_name);
 615                 }
 616                 class_decref(obd, __func__, current);
 617                 read_lock(&obd_dev_lock);
 618         }
 619         read_unlock(&obd_dev_lock);
 620
 621         return 0;
 622 }
 623
 624 LDEBUGFS_SEQ_FOPS_RO(health_check);
 625
 626 struct kset *lustre_kset;
 627 EXPORT_SYMBOL_GPL(lustre_kset);
 628
 629 static struct attribute_group lustre_attr_group = {
 630         .attrs = lustre_attrs,
 631 };
 632
 633 ssize_t class_set_global(const char *param)
 634 {
 635         const char *value = strchr(param, '=') + 1;
 636         size_t off = value - param - 1;
 637         ssize_t count = -ENOENT;
 638         int i;
 639
 640         for (i = 0; lustre_attrs[i]; i++) {
 641                 if (!strncmp(lustre_attrs[i]->name, param, off)) {
 642                         count = lustre_attr_store(&lustre_kset->kobj,
 643                                                   lustre_attrs[i], value,
 644                                                   strlen(value));
 645                         break;
 646                 }
 647         }
 648         return count;
 649 }
 650
 651 int class_procfs_init(void)
 652 {
 653         struct proc_dir_entry *entry;
 654         struct dentry *file;
 655         int rc = -ENOMEM;
 656
 657         ENTRY;
 658
 659         lustre_kset = kset_create_and_add("lustre", NULL, fs_kobj);
 660         if (!lustre_kset)
 661                 goto out;
 662
 663         /* Create the files associated with this kobject */
 664         rc = sysfs_create_group(&lustre_kset->kobj, &lustre_attr_group);
 665         if (rc) {
 666                 kset_unregister(lustre_kset);
 667                 goto out;
 668         }
 669
 670         rc = jobid_cache_init();
 671         if (rc) {
 672                 kset_unregister(lustre_kset);
 673                 goto out;
 674         }
 675
 676         debugfs_lustre_root = debugfs_create_dir("lustre", NULL);
 677
 678         file = debugfs_create_file("devices", 0444, debugfs_lustre_root, NULL,
 679                                    &obd_device_list_fops);
 680
 681         file = debugfs_create_file("health_check", 0444, debugfs_lustre_root,
 682                                    NULL, &health_check_fops);
 683
 684         file = debugfs_create_file("checksum_speed", 0444, debugfs_lustre_root,
 685                                    NULL, &checksum_speed_fops);
 686
 687         entry = lprocfs_register("fs/lustre", NULL, NULL, NULL);
 688         if (IS_ERR(entry)) {
 689                 rc = PTR_ERR(entry);
 690                 CERROR("cannot create '/proc/fs/lustre': rc = %d\n", rc);
 691                 debugfs_remove_recursive(debugfs_lustre_root);
 692                 kset_unregister(lustre_kset);
 693                 goto out;
 694         }
 695
 696         proc_lustre_root = entry;
 697 out:
 698         RETURN(rc);
 699 }
 700
 701 int class_procfs_clean(void)
 702 {
 703         ENTRY;
 704
 705         debugfs_remove_recursive(debugfs_lustre_root);
 706
 707         debugfs_lustre_root = NULL;
 708         jobid_cache_fini();
 709
 710         if (proc_lustre_root)
 711                 lprocfs_remove(&proc_lustre_root);
 712
 713         sysfs_remove_group(&lustre_kset->kobj, &lustre_attr_group);
 714
 715         kset_unregister(lustre_kset);
 716
 717         RETURN(0);
 718 }