libcfs/libcfs/module.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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 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 #include <linux/miscdevice.h>
  33 #include <linux/module.h>
  34 #include <linux/kernel.h>
  35 #include <linux/mm.h>
  36 #include <linux/string.h>
  37 #include <linux/stat.h>
  38 #include <linux/errno.h>
  39 #include <linux/unistd.h>
  40 #include <net/sock.h>
  41 #include <linux/uio.h>
  42 #include <linux/uaccess.h>
  43
  44 #include <linux/fs.h>
  45 #include <linux/file.h>
  46 #include <linux/list.h>
  47
  48 #include <linux/sysctl.h>
  49 #include <linux/debugfs.h>
  50 #include <asm/div64.h>
  51
  52 #define DEBUG_SUBSYSTEM S_LNET
  53
  54 #include <libcfs/libcfs.h>
  55 #include <libcfs/libcfs_crypto.h>
  56 #include <lnet/lib-lnet.h>
  57 #include "tracefile.h"
  58
  59 static struct dentry *lnet_debugfs_root;
  60
  61 static DECLARE_RWSEM(ioctl_list_sem);
  62 static LIST_HEAD(ioctl_list);
  63
  64 int libcfs_register_ioctl(struct libcfs_ioctl_handler *hand)
  65 {
  66         int rc = 0;
  67
  68         down_write(&ioctl_list_sem);
  69         if (!list_empty(&hand->item))
  70                 rc = -EBUSY;
  71         else
  72                 list_add_tail(&hand->item, &ioctl_list);
  73         up_write(&ioctl_list_sem);
  74
  75         return rc;
  76 }
  77 EXPORT_SYMBOL(libcfs_register_ioctl);
  78
  79 int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand)
  80 {
  81         int rc = 0;
  82
  83         down_write(&ioctl_list_sem);
  84         if (list_empty(&hand->item))
  85                 rc = -ENOENT;
  86         else
  87                 list_del_init(&hand->item);
  88         up_write(&ioctl_list_sem);
  89
  90         return rc;
  91 }
  92 EXPORT_SYMBOL(libcfs_deregister_ioctl);
  93
  94 int libcfs_ioctl(unsigned long cmd, void __user *uparam)
  95 {
  96         struct libcfs_ioctl_data *data = NULL;
  97         struct libcfs_ioctl_hdr  *hdr;
  98         int                       err;
  99         ENTRY;
 100
 101         /* 'cmd' and permissions get checked in our arch-specific caller */
 102         err = libcfs_ioctl_getdata(&hdr, uparam);
 103         if (err != 0) {
 104                 CDEBUG_LIMIT(D_ERROR,
 105                              "libcfs ioctl: data header error %d\n", err);
 106                 RETURN(err);
 107         }
 108
 109         if (hdr->ioc_version == LIBCFS_IOCTL_VERSION) {
 110                 /* The libcfs_ioctl_data_adjust() function performs adjustment
 111                  * operations on the libcfs_ioctl_data structure to make
 112                  * it usable by the code.  This doesn't need to be called
 113                  * for new data structures added. */
 114                 data = container_of(hdr, struct libcfs_ioctl_data, ioc_hdr);
 115                 err = libcfs_ioctl_data_adjust(data);
 116                 if (err != 0)
 117                         GOTO(out, err);
 118         }
 119
 120         CDEBUG(D_IOCTL, "libcfs ioctl cmd %lu\n", cmd);
 121         switch (cmd) {
 122         case IOC_LIBCFS_CLEAR_DEBUG:
 123                 libcfs_debug_clear_buffer();
 124                 break;
 125         case IOC_LIBCFS_MARK_DEBUG:
 126                 if (data == NULL ||
 127                     data->ioc_inlbuf1 == NULL ||
 128                     data->ioc_inlbuf1[data->ioc_inllen1 - 1] != '\0')
 129                         GOTO(out, err = -EINVAL);
 130
 131                 libcfs_debug_mark_buffer(data->ioc_inlbuf1);
 132                 break;
 133
 134         default: {
 135                 struct libcfs_ioctl_handler *hand;
 136
 137                 err = -EINVAL;
 138                 down_read(&ioctl_list_sem);
 139                 list_for_each_entry(hand, &ioctl_list, item) {
 140                         err = hand->handle_ioctl(cmd, hdr);
 141                         if (err == -EINVAL)
 142                                 continue;
 143
 144                         if (copy_to_user(uparam, hdr, hdr->ioc_len))
 145                                 err = -EFAULT;
 146                         break;
 147                 }
 148                 up_read(&ioctl_list_sem);
 149                 break; }
 150         }
 151 out:
 152         LIBCFS_FREE(hdr, hdr->ioc_len);
 153         RETURN(err);
 154 }
 155
 156 int lprocfs_call_handler(void *data, int write, loff_t *ppos,
 157                          void __user *buffer, size_t *lenp,
 158                          int (*handler)(void *data, int write, loff_t pos,
 159                                         void __user *buffer, int len))
 160 {
 161         int rc = handler(data, write, *ppos, buffer, *lenp);
 162
 163         if (rc < 0)
 164                 return rc;
 165
 166         if (write) {
 167                 *ppos += *lenp;
 168         } else {
 169                 *lenp = rc;
 170                 *ppos += rc;
 171         }
 172         return 0;
 173 }
 174 EXPORT_SYMBOL(lprocfs_call_handler);
 175
 176 static int __proc_dobitmasks(void *data, int write,
 177                              loff_t pos, void __user *buffer, int nob)
 178 {
 179         const int     tmpstrlen = 512;
 180         char         *tmpstr;
 181         int           rc;
 182         unsigned int *mask = data;
 183         int           is_subsys = (mask == &libcfs_subsystem_debug) ? 1 : 0;
 184         int           is_printk = (mask == &libcfs_printk) ? 1 : 0;
 185
 186         rc = cfs_trace_allocate_string_buffer(&tmpstr, tmpstrlen);
 187         if (rc < 0)
 188                 return rc;
 189
 190         if (!write) {
 191                 libcfs_debug_mask2str(tmpstr, tmpstrlen, *mask, is_subsys);
 192                 rc = strlen(tmpstr);
 193
 194                 if (pos >= rc) {
 195                         rc = 0;
 196                 } else {
 197                         rc = cfs_trace_copyout_string(buffer, nob,
 198                                                       tmpstr + pos, "\n");
 199                 }
 200         } else {
 201                 rc = cfs_trace_copyin_string(tmpstr, tmpstrlen, buffer, nob);
 202                 if (rc < 0) {
 203                         kfree(tmpstr);
 204                         return rc;
 205                 }
 206
 207                 rc = libcfs_debug_str2mask(mask, tmpstr, is_subsys);
 208                 /* Always print LBUG/LASSERT to console, so keep this mask */
 209                 if (is_printk)
 210                         *mask |= D_EMERG;
 211         }
 212
 213         kfree(tmpstr);
 214         return rc;
 215 }
 216
 217 static int proc_dobitmasks(struct ctl_table *table, int write,
 218                            void __user *buffer, size_t *lenp, loff_t *ppos)
 219 {
 220         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 221                                     __proc_dobitmasks);
 222 }
 223
 224 static int min_watchdog_ratelimit;              /* disable ratelimiting */
 225 static int max_watchdog_ratelimit = (24*60*60); /* limit to once per day */
 226
 227 static int __proc_dump_kernel(void *data, int write,
 228                               loff_t pos, void __user *buffer, int nob)
 229 {
 230         if (!write)
 231                 return 0;
 232
 233         return cfs_trace_dump_debug_buffer_usrstr(buffer, nob);
 234 }
 235
 236 static int proc_dump_kernel(struct ctl_table *table, int write,
 237                             void __user *buffer, size_t *lenp, loff_t *ppos)
 238 {
 239         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 240                                     __proc_dump_kernel);
 241 }
 242
 243 static int __proc_daemon_file(void *data, int write,
 244                               loff_t pos, void __user *buffer, int nob)
 245 {
 246         if (!write) {
 247                 int len = strlen(cfs_tracefile);
 248
 249                 if (pos >= len)
 250                         return 0;
 251
 252                 return cfs_trace_copyout_string(buffer, nob,
 253                                                 cfs_tracefile + pos, "\n");
 254         }
 255
 256         return cfs_trace_daemon_command_usrstr(buffer, nob);
 257 }
 258
 259 static int proc_daemon_file(struct ctl_table *table, int write,
 260                             void __user *buffer, size_t *lenp, loff_t *ppos)
 261 {
 262         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 263                                     __proc_daemon_file);
 264 }
 265
 266 static int libcfs_force_lbug(struct ctl_table *table, int write,
 267                              void __user *buffer,
 268                              size_t *lenp, loff_t *ppos)
 269 {
 270         if (write)
 271                 LBUG();
 272         return 0;
 273 }
 274
 275 static int proc_fail_loc(struct ctl_table *table, int write,
 276                          void __user *buffer, size_t *lenp, loff_t *ppos)
 277 {
 278         int rc;
 279         long old_fail_loc = cfs_fail_loc;
 280
 281         rc = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
 282         if (old_fail_loc != cfs_fail_loc)
 283                 wake_up(&cfs_race_waitq);
 284         return rc;
 285 }
 286
 287 static int __proc_cpt_table(void *data, int write,
 288                             loff_t pos, void __user *buffer, int nob)
 289 {
 290         char *buf = NULL;
 291         int   len = 4096;
 292         int   rc  = 0;
 293
 294         if (write)
 295                 return -EPERM;
 296
 297         LASSERT(cfs_cpt_table != NULL);
 298
 299         while (1) {
 300                 LIBCFS_ALLOC(buf, len);
 301                 if (buf == NULL)
 302                         return -ENOMEM;
 303
 304                 rc = cfs_cpt_table_print(cfs_cpt_table, buf, len);
 305                 if (rc >= 0)
 306                         break;
 307
 308                 if (rc == -EFBIG) {
 309                         LIBCFS_FREE(buf, len);
 310                         len <<= 1;
 311                         continue;
 312                 }
 313                 goto out;
 314         }
 315
 316         if (pos >= rc) {
 317                 rc = 0;
 318                 goto out;
 319         }
 320
 321         rc = cfs_trace_copyout_string(buffer, nob, buf + pos, NULL);
 322 out:
 323         if (buf != NULL)
 324                 LIBCFS_FREE(buf, len);
 325         return rc;
 326 }
 327
 328 static int proc_cpt_table(struct ctl_table *table, int write,
 329                           void __user *buffer, size_t *lenp, loff_t *ppos)
 330 {
 331         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 332                                     __proc_cpt_table);
 333 }
 334
 335 static int __proc_cpt_distance(void *data, int write,
 336                                loff_t pos, void __user *buffer, int nob)
 337 {
 338         char *buf = NULL;
 339         int   len = 4096;
 340         int   rc  = 0;
 341
 342         if (write)
 343                 return -EPERM;
 344
 345         LASSERT(cfs_cpt_table != NULL);
 346
 347         while (1) {
 348                 LIBCFS_ALLOC(buf, len);
 349                 if (buf == NULL)
 350                         return -ENOMEM;
 351
 352                 rc = cfs_cpt_distance_print(cfs_cpt_table, buf, len);
 353                 if (rc >= 0)
 354                         break;
 355
 356                 if (rc == -EFBIG) {
 357                         LIBCFS_FREE(buf, len);
 358                         len <<= 1;
 359                         continue;
 360                 }
 361                 goto out;
 362         }
 363
 364         if (pos >= rc) {
 365                 rc = 0;
 366                 goto out;
 367         }
 368
 369         rc = cfs_trace_copyout_string(buffer, nob, buf + pos, NULL);
 370  out:
 371         if (buf != NULL)
 372                 LIBCFS_FREE(buf, len);
 373         return rc;
 374 }
 375
 376 static int proc_cpt_distance(struct ctl_table *table, int write,
 377                              void __user *buffer, size_t *lenp, loff_t *ppos)
 378 {
 379         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 380                                      __proc_cpt_distance);
 381 }
 382
 383 static struct ctl_table lnet_table[] = {
 384         {
 385                 INIT_CTL_NAME
 386                 .procname       = "debug",
 387                 .data           = &libcfs_debug,
 388                 .maxlen         = sizeof(int),
 389                 .mode           = 0644,
 390                 .proc_handler   = &proc_dobitmasks,
 391         },
 392         {
 393                 INIT_CTL_NAME
 394                 .procname       = "subsystem_debug",
 395                 .data           = &libcfs_subsystem_debug,
 396                 .maxlen         = sizeof(int),
 397                 .mode           = 0644,
 398                 .proc_handler   = &proc_dobitmasks,
 399         },
 400         {
 401                 INIT_CTL_NAME
 402                 .procname       = "printk",
 403                 .data           = &libcfs_printk,
 404                 .maxlen         = sizeof(int),
 405                 .mode           = 0644,
 406                 .proc_handler   = &proc_dobitmasks,
 407         },
 408         {
 409                 INIT_CTL_NAME
 410                 .procname       = "cpu_partition_table",
 411                 .maxlen         = 128,
 412                 .mode           = 0444,
 413                 .proc_handler   = &proc_cpt_table,
 414         },
 415         {
 416                 INIT_CTL_NAME
 417                 .procname       = "cpu_partition_distance",
 418                 .maxlen         = 128,
 419                 .mode           = 0444,
 420                 .proc_handler   = &proc_cpt_distance,
 421         },
 422         {
 423                 INIT_CTL_NAME
 424                 .procname       = "debug_log_upcall",
 425                 .data           = lnet_debug_log_upcall,
 426                 .maxlen         = sizeof(lnet_debug_log_upcall),
 427                 .mode           = 0644,
 428                 .proc_handler   = &proc_dostring,
 429         },
 430         {
 431                 INIT_CTL_NAME
 432                 .procname       = "lnet_memused",
 433                 .data           = (int *)&libcfs_kmemory.counter,
 434                 .maxlen         = sizeof(int),
 435                 .mode           = 0444,
 436                 .proc_handler   = &proc_dointvec,
 437         },
 438         {
 439                 INIT_CTL_NAME
 440                 .procname       = "catastrophe",
 441                 .data           = &libcfs_catastrophe,
 442                 .maxlen         = sizeof(int),
 443                 .mode           = 0444,
 444                 .proc_handler   = &proc_dointvec,
 445         },
 446         {
 447                 INIT_CTL_NAME
 448                 .procname       = "dump_kernel",
 449                 .maxlen         = 256,
 450                 .mode           = 0200,
 451                 .proc_handler   = &proc_dump_kernel,
 452         },
 453         {
 454                 INIT_CTL_NAME
 455                 .procname       = "daemon_file",
 456                 .mode           = 0644,
 457                 .maxlen         = 256,
 458                 .proc_handler   = &proc_daemon_file,
 459         },
 460         {
 461                 INIT_CTL_NAME
 462                 .procname       = "watchdog_ratelimit",
 463                 .data           = &libcfs_watchdog_ratelimit,
 464                 .maxlen         = sizeof(int),
 465                 .mode           = 0644,
 466                 .proc_handler   = &proc_dointvec_minmax,
 467                 .extra1         = &min_watchdog_ratelimit,
 468                 .extra2         = &max_watchdog_ratelimit,
 469         },
 470         {
 471                 INIT_CTL_NAME
 472                 .procname       = "force_lbug",
 473                 .data           = NULL,
 474                 .maxlen         = 0,
 475                 .mode           = 0200,
 476                 .proc_handler   = &libcfs_force_lbug
 477         },
 478         {
 479                 INIT_CTL_NAME
 480                 .procname       = "fail_loc",
 481                 .data           = &cfs_fail_loc,
 482                 .maxlen         = sizeof(cfs_fail_loc),
 483                 .mode           = 0644,
 484                 .proc_handler   = &proc_fail_loc
 485         },
 486         {
 487                 INIT_CTL_NAME
 488                 .procname       = "fail_val",
 489                 .data           = &cfs_fail_val,
 490                 .maxlen         = sizeof(int),
 491                 .mode           = 0644,
 492                 .proc_handler   = &proc_dointvec
 493         },
 494         {
 495                 INIT_CTL_NAME
 496                 .procname       = "fail_err",
 497                 .data           = &cfs_fail_err,
 498                 .maxlen         = sizeof(cfs_fail_err),
 499                 .mode           = 0644,
 500                 .proc_handler   = &proc_dointvec,
 501         },
 502         {
 503         }
 504 };
 505
 506 static const struct lnet_debugfs_symlink_def lnet_debugfs_symlinks[] = {
 507         { .name         = "console_ratelimit",
 508           .target       = "../../../module/libcfs/parameters/libcfs_console_ratelimit" },
 509         { .name         = "debug_path",
 510           .target       = "../../../module/libcfs/parameters/libcfs_debug_file_path" },
 511         { .name         = "panic_on_lbug",
 512           .target       = "../../../module/libcfs/parameters/libcfs_panic_on_lbug" },
 513         { .name         = "console_backoff",
 514           .target       = "../../../module/libcfs/parameters/libcfs_console_backoff" },
 515         { .name         = "debug_mb",
 516           .target       = "../../../module/libcfs/parameters/libcfs_debug_mb" },
 517         { .name         = "console_min_delay_centisecs",
 518           .target       = "../../../module/libcfs/parameters/libcfs_console_min_delay" },
 519         { .name         = "console_max_delay_centisecs",
 520           .target       = "../../../module/libcfs/parameters/libcfs_console_max_delay" },
 521         { .name         = NULL },
 522 };
 523
 524 static ssize_t lnet_debugfs_read(struct file *filp, char __user *buf,
 525                                  size_t count, loff_t *ppos)
 526 {
 527         struct ctl_table *table = filp->private_data;
 528         ssize_t rc;
 529
 530         rc = table->proc_handler(table, 0, buf, &count, ppos);
 531         if (!rc)
 532                 rc = count;
 533
 534         return rc;
 535 }
 536
 537 static ssize_t lnet_debugfs_write(struct file *filp, const char __user *buf,
 538                                   size_t count, loff_t *ppos)
 539 {
 540         struct ctl_table *table = filp->private_data;
 541         ssize_t rc;
 542
 543         rc = table->proc_handler(table, 1, (void __user *)buf, &count, ppos);
 544         if (!rc)
 545                 rc = count;
 546
 547         return rc;
 548 }
 549
 550 static const struct file_operations lnet_debugfs_file_operations_rw = {
 551         .open           = simple_open,
 552         .read           = lnet_debugfs_read,
 553         .write          = lnet_debugfs_write,
 554         .llseek         = default_llseek,
 555 };
 556
 557 static const struct file_operations lnet_debugfs_file_operations_ro = {
 558         .open           = simple_open,
 559         .read           = lnet_debugfs_read,
 560         .llseek         = default_llseek,
 561 };
 562
 563 static const struct file_operations lnet_debugfs_file_operations_wo = {
 564         .open           = simple_open,
 565         .write          = lnet_debugfs_write,
 566         .llseek         = default_llseek,
 567 };
 568
 569 static const struct file_operations *lnet_debugfs_fops_select(umode_t mode)
 570 {
 571         if (!(mode & S_IWUGO))
 572                 return &lnet_debugfs_file_operations_ro;
 573
 574         if (!(mode & S_IRUGO))
 575                 return &lnet_debugfs_file_operations_wo;
 576
 577         return &lnet_debugfs_file_operations_rw;
 578 }
 579
 580 void lnet_insert_debugfs(struct ctl_table *table,
 581                          const struct lnet_debugfs_symlink_def *symlinks)
 582 {
 583         if (!lnet_debugfs_root)
 584                 lnet_debugfs_root = debugfs_create_dir("lnet", NULL);
 585
 586         /* Even if we cannot create, just ignore it altogether) */
 587         if (IS_ERR_OR_NULL(lnet_debugfs_root))
 588                 return;
 589
 590         /* We don't save the dentry returned in next two calls, because
 591          * we don't call debugfs_remove() but rather remove_recursive()
 592          */
 593         for (; table && table->procname; table++)
 594                 debugfs_create_file(table->procname, table->mode,
 595                                     lnet_debugfs_root, table,
 596                                     lnet_debugfs_fops_select(table->mode));
 597
 598         for (; symlinks && symlinks->name; symlinks++)
 599                 debugfs_create_symlink(symlinks->name, lnet_debugfs_root,
 600                                        symlinks->target);
 601 }
 602 EXPORT_SYMBOL_GPL(lnet_insert_debugfs);
 603
 604 static void lnet_remove_debugfs(void)
 605 {
 606         debugfs_remove_recursive(lnet_debugfs_root);
 607
 608         lnet_debugfs_root = NULL;
 609 }
 610
 611 static int __init libcfs_init(void)
 612 {
 613         int rc;
 614
 615         rc = libcfs_debug_init(5 * 1024 * 1024);
 616         if (rc < 0) {
 617                 printk(KERN_ERR "LustreError: libcfs_debug_init: %d\n", rc);
 618                 return (rc);
 619         }
 620
 621         rc = cfs_cpu_init();
 622         if (rc != 0)
 623                 goto cleanup_debug;
 624
 625         rc = misc_register(&libcfs_dev);
 626         if (rc) {
 627                 CERROR("misc_register: error %d\n", rc);
 628                 goto cleanup_cpu;
 629         }
 630
 631         rc = cfs_wi_startup();
 632         if (rc) {
 633                 CERROR("initialize workitem: error %d\n", rc);
 634                 goto cleanup_deregister;
 635         }
 636
 637         /* max to 4 threads, should be enough for rehash */
 638         rc = min(cfs_cpt_weight(cfs_cpt_table, CFS_CPT_ANY), 4);
 639         rc = cfs_wi_sched_create("cfs_rh", cfs_cpt_table, CFS_CPT_ANY,
 640                                  rc, &cfs_sched_rehash);
 641         if (rc != 0) {
 642                 CERROR("Startup workitem scheduler: error: %d\n", rc);
 643                 goto cleanup_deregister;
 644         }
 645
 646         rc = cfs_crypto_register();
 647         if (rc) {
 648                 CERROR("cfs_crypto_regster: error %d\n", rc);
 649                 goto cleanup_wi;
 650         }
 651
 652         lnet_insert_debugfs(lnet_table, lnet_debugfs_symlinks);
 653
 654         CDEBUG (D_OTHER, "portals setup OK\n");
 655         return 0;
 656 cleanup_wi:
 657         cfs_wi_shutdown();
 658 cleanup_deregister:
 659         misc_deregister(&libcfs_dev);
 660 cleanup_cpu:
 661         cfs_cpu_fini();
 662 cleanup_debug:
 663         libcfs_debug_cleanup();
 664         return rc;
 665 }
 666
 667 static void __exit libcfs_exit(void)
 668 {
 669         int rc;
 670
 671         lnet_remove_debugfs();
 672
 673         CDEBUG(D_MALLOC, "before Portals cleanup: kmem %d\n",
 674                atomic_read(&libcfs_kmemory));
 675
 676         if (cfs_sched_rehash != NULL) {
 677                 cfs_wi_sched_destroy(cfs_sched_rehash);
 678                 cfs_sched_rehash = NULL;
 679         }
 680
 681         cfs_crypto_unregister();
 682         cfs_wi_shutdown();
 683
 684         misc_deregister(&libcfs_dev);
 685
 686         cfs_cpu_fini();
 687
 688         if (atomic_read(&libcfs_kmemory) != 0)
 689                 CERROR("Portals memory leaked: %d bytes\n",
 690                        atomic_read(&libcfs_kmemory));
 691
 692         rc = libcfs_debug_cleanup();
 693         if (rc)
 694                 printk(KERN_ERR "LustreError: libcfs_debug_cleanup: %d\n",
 695                        rc);
 696 }
 697
 698 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
 699 MODULE_DESCRIPTION("Lustre helper library");
 700 MODULE_VERSION(LIBCFS_VERSION);
 701 MODULE_LICENSE("GPL");
 702
 703 module_init(libcfs_init);
 704 module_exit(libcfs_exit);