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, 2017, 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 BLOCKING_NOTIFIER_HEAD(libcfs_ioctl_list);
  62 EXPORT_SYMBOL(libcfs_ioctl_list);
  63
  64 static int libcfs_ioctl(unsigned long cmd, void __user *uparam)
  65 {
  66         struct libcfs_ioctl_data *data = NULL;
  67         struct libcfs_ioctl_hdr  *hdr;
  68         int                       err;
  69         ENTRY;
  70
  71         /* 'cmd' and permissions get checked in our arch-specific caller */
  72         err = libcfs_ioctl_getdata(&hdr, uparam);
  73         if (err != 0) {
  74                 CDEBUG_LIMIT(D_ERROR,
  75                              "libcfs ioctl: data header error %d\n", err);
  76                 RETURN(err);
  77         }
  78
  79         if (hdr->ioc_version == LIBCFS_IOCTL_VERSION) {
  80                 /* The libcfs_ioctl_data_adjust() function performs adjustment
  81                  * operations on the libcfs_ioctl_data structure to make
  82                  * it usable by the code.  This doesn't need to be called
  83                  * for new data structures added. */
  84                 data = container_of(hdr, struct libcfs_ioctl_data, ioc_hdr);
  85                 err = libcfs_ioctl_data_adjust(data);
  86                 if (err != 0)
  87                         GOTO(out, err);
  88         }
  89
  90         CDEBUG(D_IOCTL, "libcfs ioctl cmd %lu\n", cmd);
  91         switch (cmd) {
  92         case IOC_LIBCFS_CLEAR_DEBUG:
  93                 libcfs_debug_clear_buffer();
  94                 break;
  95         case IOC_LIBCFS_MARK_DEBUG:
  96                 if (data == NULL ||
  97                     data->ioc_inlbuf1 == NULL ||
  98                     data->ioc_inlbuf1[data->ioc_inllen1 - 1] != '\0')
  99                         GOTO(out, err = -EINVAL);
 100
 101                 libcfs_debug_mark_buffer(data->ioc_inlbuf1);
 102                 break;
 103
 104         default:
 105                 err = blocking_notifier_call_chain(&libcfs_ioctl_list,
 106                                                    cmd, hdr);
 107                 if (!(err & NOTIFY_STOP_MASK))
 108                         /* No-one claimed the ioctl */
 109                         err = -EINVAL;
 110                 else
 111                         err = notifier_to_errno(err);
 112                 if (!err)
 113                         if (copy_to_user(uparam, hdr, hdr->ioc_len))
 114                                 err = -EFAULT;
 115                 break;
 116         }
 117 out:
 118         LIBCFS_FREE(hdr, hdr->ioc_len);
 119         RETURN(err);
 120 }
 121
 122 static long
 123 libcfs_psdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 124 {
 125         if (!capable(CAP_SYS_ADMIN))
 126                 return -EACCES;
 127
 128         if (_IOC_TYPE(cmd) != IOC_LIBCFS_TYPE ||
 129             _IOC_NR(cmd) < IOC_LIBCFS_MIN_NR  ||
 130             _IOC_NR(cmd) > IOC_LIBCFS_MAX_NR) {
 131                 CDEBUG(D_IOCTL, "invalid ioctl ( type %d, nr %d, size %d )\n",
 132                        _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
 133                 return -EINVAL;
 134         }
 135
 136         return libcfs_ioctl(cmd, (void __user *)arg);
 137 }
 138
 139 static const struct file_operations libcfs_fops = {
 140         .owner                  = THIS_MODULE,
 141         .unlocked_ioctl         = libcfs_psdev_ioctl,
 142 };
 143
 144 static struct miscdevice libcfs_dev = {
 145         .minor                  = MISC_DYNAMIC_MINOR,
 146         .name                   = "lnet",
 147         .fops                   = &libcfs_fops,
 148 };
 149
 150 int lprocfs_call_handler(void *data, int write, loff_t *ppos,
 151                          void __user *buffer, size_t *lenp,
 152                          int (*handler)(void *data, int write, loff_t pos,
 153                                         void __user *buffer, int len))
 154 {
 155         int rc = handler(data, write, *ppos, buffer, *lenp);
 156
 157         if (rc < 0)
 158                 return rc;
 159
 160         if (write) {
 161                 *ppos += *lenp;
 162         } else {
 163                 *lenp = rc;
 164                 *ppos += rc;
 165         }
 166         return 0;
 167 }
 168 EXPORT_SYMBOL(lprocfs_call_handler);
 169
 170 static int __proc_dobitmasks(void *data, int write,
 171                              loff_t pos, void __user *buffer, int nob)
 172 {
 173         const int     tmpstrlen = 512;
 174         char         *tmpstr;
 175         int           rc;
 176         unsigned int *mask = data;
 177         int           is_subsys = (mask == &libcfs_subsystem_debug) ? 1 : 0;
 178         int           is_printk = (mask == &libcfs_printk) ? 1 : 0;
 179
 180         rc = cfs_trace_allocate_string_buffer(&tmpstr, tmpstrlen);
 181         if (rc < 0)
 182                 return rc;
 183
 184         if (!write) {
 185                 libcfs_debug_mask2str(tmpstr, tmpstrlen, *mask, is_subsys);
 186                 rc = strlen(tmpstr);
 187
 188                 if (pos >= rc) {
 189                         rc = 0;
 190                 } else {
 191                         rc = cfs_trace_copyout_string(buffer, nob,
 192                                                       tmpstr + pos, "\n");
 193                 }
 194         } else {
 195                 rc = cfs_trace_copyin_string(tmpstr, tmpstrlen, buffer, nob);
 196                 if (rc < 0) {
 197                         kfree(tmpstr);
 198                         return rc;
 199                 }
 200
 201                 rc = libcfs_debug_str2mask(mask, tmpstr, is_subsys);
 202                 /* Always print LBUG/LASSERT to console, so keep this mask */
 203                 if (is_printk)
 204                         *mask |= D_EMERG;
 205         }
 206
 207         kfree(tmpstr);
 208         return rc;
 209 }
 210
 211 static int proc_dobitmasks(struct ctl_table *table, int write,
 212                            void __user *buffer, size_t *lenp, loff_t *ppos)
 213 {
 214         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 215                                     __proc_dobitmasks);
 216 }
 217
 218 static int min_watchdog_ratelimit;              /* disable ratelimiting */
 219 static int max_watchdog_ratelimit = (24*60*60); /* limit to once per day */
 220
 221 static int __proc_dump_kernel(void *data, int write,
 222                               loff_t pos, void __user *buffer, int nob)
 223 {
 224         if (!write)
 225                 return 0;
 226
 227         return cfs_trace_dump_debug_buffer_usrstr(buffer, nob);
 228 }
 229
 230 static int proc_dump_kernel(struct ctl_table *table, int write,
 231                             void __user *buffer, size_t *lenp, loff_t *ppos)
 232 {
 233         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 234                                     __proc_dump_kernel);
 235 }
 236
 237 static int __proc_daemon_file(void *data, int write,
 238                               loff_t pos, void __user *buffer, int nob)
 239 {
 240         if (!write) {
 241                 int len = strlen(cfs_tracefile);
 242
 243                 if (pos >= len)
 244                         return 0;
 245
 246                 return cfs_trace_copyout_string(buffer, nob,
 247                                                 cfs_tracefile + pos, "\n");
 248         }
 249
 250         return cfs_trace_daemon_command_usrstr(buffer, nob);
 251 }
 252
 253 static int proc_daemon_file(struct ctl_table *table, int write,
 254                             void __user *buffer, size_t *lenp, loff_t *ppos)
 255 {
 256         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 257                                     __proc_daemon_file);
 258 }
 259
 260 static int libcfs_force_lbug(struct ctl_table *table, int write,
 261                              void __user *buffer,
 262                              size_t *lenp, loff_t *ppos)
 263 {
 264         if (write)
 265                 LBUG();
 266         return 0;
 267 }
 268
 269 static int proc_fail_loc(struct ctl_table *table, int write,
 270                          void __user *buffer, size_t *lenp, loff_t *ppos)
 271 {
 272         int rc;
 273         long old_fail_loc = cfs_fail_loc;
 274
 275         rc = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
 276         if (old_fail_loc != cfs_fail_loc)
 277                 wake_up(&cfs_race_waitq);
 278         return rc;
 279 }
 280
 281 static int __proc_cpt_table(void *data, int write,
 282                             loff_t pos, void __user *buffer, int nob)
 283 {
 284         char *buf = NULL;
 285         int   len = 4096;
 286         int   rc  = 0;
 287
 288         if (write)
 289                 return -EPERM;
 290
 291         LASSERT(cfs_cpt_table != NULL);
 292
 293         while (1) {
 294                 LIBCFS_ALLOC(buf, len);
 295                 if (buf == NULL)
 296                         return -ENOMEM;
 297
 298                 rc = cfs_cpt_table_print(cfs_cpt_table, buf, len);
 299                 if (rc >= 0)
 300                         break;
 301
 302                 if (rc == -EFBIG) {
 303                         LIBCFS_FREE(buf, len);
 304                         len <<= 1;
 305                         continue;
 306                 }
 307                 goto out;
 308         }
 309
 310         if (pos >= rc) {
 311                 rc = 0;
 312                 goto out;
 313         }
 314
 315         rc = cfs_trace_copyout_string(buffer, nob, buf + pos, NULL);
 316 out:
 317         if (buf != NULL)
 318                 LIBCFS_FREE(buf, len);
 319         return rc;
 320 }
 321
 322 static int proc_cpt_table(struct ctl_table *table, int write,
 323                           void __user *buffer, size_t *lenp, loff_t *ppos)
 324 {
 325         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 326                                     __proc_cpt_table);
 327 }
 328
 329 static int __proc_cpt_distance(void *data, int write,
 330                                loff_t pos, void __user *buffer, int nob)
 331 {
 332         char *buf = NULL;
 333         int   len = 4096;
 334         int   rc  = 0;
 335
 336         if (write)
 337                 return -EPERM;
 338
 339         LASSERT(cfs_cpt_table != NULL);
 340
 341         while (1) {
 342                 LIBCFS_ALLOC(buf, len);
 343                 if (buf == NULL)
 344                         return -ENOMEM;
 345
 346                 rc = cfs_cpt_distance_print(cfs_cpt_table, buf, len);
 347                 if (rc >= 0)
 348                         break;
 349
 350                 if (rc == -EFBIG) {
 351                         LIBCFS_FREE(buf, len);
 352                         len <<= 1;
 353                         continue;
 354                 }
 355                 goto out;
 356         }
 357
 358         if (pos >= rc) {
 359                 rc = 0;
 360                 goto out;
 361         }
 362
 363         rc = cfs_trace_copyout_string(buffer, nob, buf + pos, NULL);
 364  out:
 365         if (buf != NULL)
 366                 LIBCFS_FREE(buf, len);
 367         return rc;
 368 }
 369
 370 static int proc_cpt_distance(struct ctl_table *table, int write,
 371                              void __user *buffer, size_t *lenp, loff_t *ppos)
 372 {
 373         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 374                                      __proc_cpt_distance);
 375 }
 376
 377 static struct ctl_table lnet_table[] = {
 378         {
 379                 INIT_CTL_NAME
 380                 .procname       = "debug",
 381                 .data           = &libcfs_debug,
 382                 .maxlen         = sizeof(int),
 383                 .mode           = 0644,
 384                 .proc_handler   = &proc_dobitmasks,
 385         },
 386         {
 387                 INIT_CTL_NAME
 388                 .procname       = "subsystem_debug",
 389                 .data           = &libcfs_subsystem_debug,
 390                 .maxlen         = sizeof(int),
 391                 .mode           = 0644,
 392                 .proc_handler   = &proc_dobitmasks,
 393         },
 394         {
 395                 INIT_CTL_NAME
 396                 .procname       = "printk",
 397                 .data           = &libcfs_printk,
 398                 .maxlen         = sizeof(int),
 399                 .mode           = 0644,
 400                 .proc_handler   = &proc_dobitmasks,
 401         },
 402         {
 403                 INIT_CTL_NAME
 404                 .procname       = "cpu_partition_table",
 405                 .maxlen         = 128,
 406                 .mode           = 0444,
 407                 .proc_handler   = &proc_cpt_table,
 408         },
 409         {
 410                 INIT_CTL_NAME
 411                 .procname       = "cpu_partition_distance",
 412                 .maxlen         = 128,
 413                 .mode           = 0444,
 414                 .proc_handler   = &proc_cpt_distance,
 415         },
 416         {
 417                 INIT_CTL_NAME
 418                 .procname       = "debug_log_upcall",
 419                 .data           = lnet_debug_log_upcall,
 420                 .maxlen         = sizeof(lnet_debug_log_upcall),
 421                 .mode           = 0644,
 422                 .proc_handler   = &proc_dostring,
 423         },
 424         {
 425                 INIT_CTL_NAME
 426                 .procname       = "lnet_memused",
 427                 .data           = (int *)&libcfs_kmemory.counter,
 428                 .maxlen         = sizeof(int),
 429                 .mode           = 0444,
 430                 .proc_handler   = &proc_dointvec,
 431         },
 432         {
 433                 INIT_CTL_NAME
 434                 .procname       = "catastrophe",
 435                 .data           = &libcfs_catastrophe,
 436                 .maxlen         = sizeof(int),
 437                 .mode           = 0444,
 438                 .proc_handler   = &proc_dointvec,
 439         },
 440         {
 441                 INIT_CTL_NAME
 442                 .procname       = "dump_kernel",
 443                 .maxlen         = 256,
 444                 .mode           = 0200,
 445                 .proc_handler   = &proc_dump_kernel,
 446         },
 447         {
 448                 INIT_CTL_NAME
 449                 .procname       = "daemon_file",
 450                 .mode           = 0644,
 451                 .maxlen         = 256,
 452                 .proc_handler   = &proc_daemon_file,
 453         },
 454         {
 455                 INIT_CTL_NAME
 456                 .procname       = "watchdog_ratelimit",
 457                 .data           = &libcfs_watchdog_ratelimit,
 458                 .maxlen         = sizeof(int),
 459                 .mode           = 0644,
 460                 .proc_handler   = &proc_dointvec_minmax,
 461                 .extra1         = &min_watchdog_ratelimit,
 462                 .extra2         = &max_watchdog_ratelimit,
 463         },
 464         {
 465                 INIT_CTL_NAME
 466                 .procname       = "force_lbug",
 467                 .data           = NULL,
 468                 .maxlen         = 0,
 469                 .mode           = 0200,
 470                 .proc_handler   = &libcfs_force_lbug
 471         },
 472         {
 473                 INIT_CTL_NAME
 474                 .procname       = "fail_loc",
 475                 .data           = &cfs_fail_loc,
 476                 .maxlen         = sizeof(cfs_fail_loc),
 477                 .mode           = 0644,
 478                 .proc_handler   = &proc_fail_loc
 479         },
 480         {
 481                 INIT_CTL_NAME
 482                 .procname       = "fail_val",
 483                 .data           = &cfs_fail_val,
 484                 .maxlen         = sizeof(int),
 485                 .mode           = 0644,
 486                 .proc_handler   = &proc_dointvec
 487         },
 488         {
 489                 INIT_CTL_NAME
 490                 .procname       = "fail_err",
 491                 .data           = &cfs_fail_err,
 492                 .maxlen         = sizeof(cfs_fail_err),
 493                 .mode           = 0644,
 494                 .proc_handler   = &proc_dointvec,
 495         },
 496         {
 497         }
 498 };
 499
 500 static const struct lnet_debugfs_symlink_def lnet_debugfs_symlinks[] = {
 501         { .name         = "console_ratelimit",
 502           .target       = "../../../module/libcfs/parameters/libcfs_console_ratelimit" },
 503         { .name         = "debug_path",
 504           .target       = "../../../module/libcfs/parameters/libcfs_debug_file_path" },
 505         { .name         = "panic_on_lbug",
 506           .target       = "../../../module/libcfs/parameters/libcfs_panic_on_lbug" },
 507         { .name         = "console_backoff",
 508           .target       = "../../../module/libcfs/parameters/libcfs_console_backoff" },
 509         { .name         = "debug_mb",
 510           .target       = "../../../module/libcfs/parameters/libcfs_debug_mb" },
 511         { .name         = "console_min_delay_centisecs",
 512           .target       = "../../../module/libcfs/parameters/libcfs_console_min_delay" },
 513         { .name         = "console_max_delay_centisecs",
 514           .target       = "../../../module/libcfs/parameters/libcfs_console_max_delay" },
 515         { .name         = NULL },
 516 };
 517
 518 static ssize_t lnet_debugfs_read(struct file *filp, char __user *buf,
 519                                  size_t count, loff_t *ppos)
 520 {
 521         struct ctl_table *table = filp->private_data;
 522         ssize_t rc = -EINVAL;
 523
 524         if (table) {
 525                 rc = table->proc_handler(table, 0, buf, &count, ppos);
 526                 if (!rc)
 527                         rc = count;
 528         }
 529
 530         return rc;
 531 }
 532
 533 static ssize_t lnet_debugfs_write(struct file *filp, const char __user *buf,
 534                                   size_t count, loff_t *ppos)
 535 {
 536         struct ctl_table *table = filp->private_data;
 537         ssize_t rc = -EINVAL;
 538
 539         if (table) {
 540                 rc = table->proc_handler(table, 1, (void __user *)buf, &count,
 541                                          ppos);
 542                 if (!rc)
 543                         rc = count;
 544         }
 545
 546         return rc;
 547 }
 548
 549 static const struct file_operations lnet_debugfs_file_operations_rw = {
 550         .open           = simple_open,
 551         .read           = lnet_debugfs_read,
 552         .write          = lnet_debugfs_write,
 553         .llseek         = default_llseek,
 554 };
 555
 556 static const struct file_operations lnet_debugfs_file_operations_ro = {
 557         .open           = simple_open,
 558         .read           = lnet_debugfs_read,
 559         .llseek         = default_llseek,
 560 };
 561
 562 static const struct file_operations lnet_debugfs_file_operations_wo = {
 563         .open           = simple_open,
 564         .write          = lnet_debugfs_write,
 565         .llseek         = default_llseek,
 566 };
 567
 568 static const struct file_operations *lnet_debugfs_fops_select(umode_t mode)
 569 {
 570         if (!(mode & S_IWUGO))
 571                 return &lnet_debugfs_file_operations_ro;
 572
 573         if (!(mode & S_IRUGO))
 574                 return &lnet_debugfs_file_operations_wo;
 575
 576         return &lnet_debugfs_file_operations_rw;
 577 }
 578
 579 void lnet_insert_debugfs(struct ctl_table *table)
 580 {
 581         if (!lnet_debugfs_root)
 582                 lnet_debugfs_root = debugfs_create_dir("lnet", NULL);
 583
 584         /* Even if we cannot create, just ignore it altogether) */
 585         if (IS_ERR_OR_NULL(lnet_debugfs_root))
 586                 return;
 587
 588         /* We don't save the dentry returned in next two calls, because
 589          * we don't call debugfs_remove() but rather remove_recursive()
 590          */
 591         for (; table && table->procname; table++)
 592                 debugfs_create_file(table->procname, table->mode,
 593                                     lnet_debugfs_root, table,
 594                                     lnet_debugfs_fops_select(table->mode));
 595 }
 596 EXPORT_SYMBOL_GPL(lnet_insert_debugfs);
 597
 598 static void lnet_insert_debugfs_links(
 599                 const struct lnet_debugfs_symlink_def *symlinks)
 600 {
 601         for (; symlinks && symlinks->name; symlinks++)
 602                 debugfs_create_symlink(symlinks->name, lnet_debugfs_root,
 603                                        symlinks->target);
 604 }
 605
 606 void lnet_remove_debugfs(struct ctl_table *table)
 607 {
 608         for (; table && table->procname; table++) {
 609                 struct qstr dname = QSTR_INIT(table->procname,
 610                                               strlen(table->procname));
 611                 struct dentry *dentry;
 612
 613                 dentry = d_hash_and_lookup(lnet_debugfs_root, &dname);
 614                 debugfs_remove(dentry);
 615         }
 616 }
 617 EXPORT_SYMBOL_GPL(lnet_remove_debugfs);
 618
 619 static int __init libcfs_init(void)
 620 {
 621         int rc;
 622
 623 #ifndef HAVE_WAIT_VAR_EVENT
 624         wait_bit_init();
 625 #endif
 626         rc = libcfs_debug_init(5 * 1024 * 1024);
 627         if (rc < 0) {
 628                 printk(KERN_ERR "LustreError: libcfs_debug_init: %d\n", rc);
 629                 return (rc);
 630         }
 631
 632         rc = cfs_cpu_init();
 633         if (rc != 0)
 634                 goto cleanup_debug;
 635
 636         rc = misc_register(&libcfs_dev);
 637         if (rc) {
 638                 CERROR("misc_register: error %d\n", rc);
 639                 goto cleanup_cpu;
 640         }
 641
 642         rc = cfs_wi_startup();
 643         if (rc) {
 644                 CERROR("initialize workitem: error %d\n", rc);
 645                 goto cleanup_deregister;
 646         }
 647
 648         cfs_rehash_wq = alloc_workqueue("cfs_rh", WQ_SYSFS, 4);
 649         if (!cfs_rehash_wq) {
 650                 rc = -ENOMEM;
 651                 CERROR("libcfs: failed to start rehash workqueue: rc = %d\n",
 652                        rc);
 653                 goto cleanup_deregister;
 654         }
 655
 656         rc = cfs_crypto_register();
 657         if (rc) {
 658                 CERROR("cfs_crypto_regster: error %d\n", rc);
 659                 goto cleanup_wi;
 660         }
 661
 662         lnet_insert_debugfs(lnet_table);
 663         if (!IS_ERR_OR_NULL(lnet_debugfs_root))
 664                 lnet_insert_debugfs_links(lnet_debugfs_symlinks);
 665
 666         CDEBUG (D_OTHER, "portals setup OK\n");
 667         return 0;
 668 cleanup_wi:
 669         cfs_wi_shutdown();
 670 cleanup_deregister:
 671         misc_deregister(&libcfs_dev);
 672 cleanup_cpu:
 673         cfs_cpu_fini();
 674 cleanup_debug:
 675         libcfs_debug_cleanup();
 676         return rc;
 677 }
 678
 679 static void __exit libcfs_exit(void)
 680 {
 681         int rc;
 682
 683         /* Remove everthing */
 684         debugfs_remove_recursive(lnet_debugfs_root);
 685         lnet_debugfs_root = NULL;
 686
 687         CDEBUG(D_MALLOC, "before Portals cleanup: kmem %d\n",
 688                atomic_read(&libcfs_kmemory));
 689
 690         if (cfs_rehash_wq) {
 691                 destroy_workqueue(cfs_rehash_wq);
 692                 cfs_rehash_wq = NULL;
 693         }
 694
 695         cfs_crypto_unregister();
 696         cfs_wi_shutdown();
 697
 698         misc_deregister(&libcfs_dev);
 699
 700         cfs_cpu_fini();
 701
 702         /* the below message is checked in test-framework.sh check_mem_leak() */
 703         if (atomic_read(&libcfs_kmemory) != 0)
 704                 CERROR("Portals memory leaked: %d bytes\n",
 705                        atomic_read(&libcfs_kmemory));
 706
 707         rc = libcfs_debug_cleanup();
 708         if (rc)
 709                 printk(KERN_ERR "LustreError: libcfs_debug_cleanup: %d\n",
 710                        rc);
 711 }
 712
 713 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
 714 MODULE_DESCRIPTION("Lustre helper library");
 715 MODULE_VERSION(LIBCFS_VERSION);
 716 MODULE_LICENSE("GPL");
 717
 718 module_init(libcfs_init);
 719 module_exit(libcfs_exit);