lustre/obdclass/class_obd.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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2015, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_CLASS
  38
  39 #include <linux/user_namespace.h>
  40 #ifdef HAVE_UIDGID_HEADER
  41 # include <linux/uidgid.h>
  42 #endif
  43 #include <linux/atomic.h>
  44
  45 #include <obd_support.h>
  46 #include <obd_class.h>
  47 #include <lnet/lnetctl.h>
  48 #include <lustre_debug.h>
  49 #include <lprocfs_status.h>
  50 #include <lustre_ver.h>
  51 #include <libcfs/list.h>
  52 #include <cl_object.h>
  53 #ifdef HAVE_SERVER_SUPPORT
  54 # include <dt_object.h>
  55 # include <md_object.h>
  56 #endif /* HAVE_SERVER_SUPPORT */
  57 #include <lustre_ioctl.h>
  58 #include "llog_internal.h"
  59
  60 struct obd_device *obd_devs[MAX_OBD_DEVICES];
  61 struct list_head obd_types;
  62 DEFINE_RWLOCK(obd_dev_lock);
  63
  64 #ifdef CONFIG_PROC_FS
  65 static __u64 obd_max_alloc;
  66 #else
  67 __u64 obd_max_alloc;
  68 #endif
  69
  70 static DEFINE_SPINLOCK(obd_updatemax_lock);
  71
  72 /* The following are visible and mutable through /proc/sys/lustre/. */
  73 unsigned int obd_debug_peer_on_timeout;
  74 EXPORT_SYMBOL(obd_debug_peer_on_timeout);
  75 unsigned int obd_dump_on_timeout;
  76 EXPORT_SYMBOL(obd_dump_on_timeout);
  77 unsigned int obd_dump_on_eviction;
  78 EXPORT_SYMBOL(obd_dump_on_eviction);
  79 unsigned long obd_max_dirty_pages;
  80 EXPORT_SYMBOL(obd_max_dirty_pages);
  81 atomic_long_t obd_dirty_pages;
  82 EXPORT_SYMBOL(obd_dirty_pages);
  83 unsigned int obd_timeout = OBD_TIMEOUT_DEFAULT;   /* seconds */
  84 EXPORT_SYMBOL(obd_timeout);
  85 unsigned int ldlm_timeout = LDLM_TIMEOUT_DEFAULT; /* seconds */
  86 EXPORT_SYMBOL(ldlm_timeout);
  87 unsigned int obd_timeout_set;
  88 EXPORT_SYMBOL(obd_timeout_set);
  89 unsigned int ldlm_timeout_set;
  90 EXPORT_SYMBOL(ldlm_timeout_set);
  91 /* bulk transfer timeout, give up after 100s by default */
  92 unsigned int bulk_timeout = 100; /* seconds */
  93 EXPORT_SYMBOL(bulk_timeout);
  94 /* Adaptive timeout defs here instead of ptlrpc module for /proc/sys/ access */
  95 unsigned int at_min = 0;
  96 EXPORT_SYMBOL(at_min);
  97 unsigned int at_max = 600;
  98 EXPORT_SYMBOL(at_max);
  99 unsigned int at_history = 600;
 100 EXPORT_SYMBOL(at_history);
 101 int at_early_margin = 5;
 102 EXPORT_SYMBOL(at_early_margin);
 103 int at_extra = 30;
 104 EXPORT_SYMBOL(at_extra);
 105
 106 atomic_long_t obd_dirty_transit_pages;
 107 EXPORT_SYMBOL(obd_dirty_transit_pages);
 108
 109 char obd_jobid_var[JOBSTATS_JOBID_VAR_MAX_LEN + 1] = JOBSTATS_DISABLE;
 110
 111 #ifdef CONFIG_PROC_FS
 112 struct lprocfs_stats *obd_memory = NULL;
 113 EXPORT_SYMBOL(obd_memory);
 114 #endif
 115
 116 char obd_jobid_node[LUSTRE_JOBID_SIZE + 1];
 117
 118 /* Get jobid of current process by reading the environment variable
 119  * stored in between the "env_start" & "env_end" of task struct.
 120  *
 121  * TODO:
 122  * It's better to cache the jobid for later use if there is any
 123  * efficient way, the cl_env code probably could be reused for this
 124  * purpose.
 125  *
 126  * If some job scheduler doesn't store jobid in the "env_start/end",
 127  * then an upcall could be issued here to get the jobid by utilizing
 128  * the userspace tools/api. Then, the jobid must be cached.
 129  */
 130 int lustre_get_jobid(char *jobid)
 131 {
 132         int jobid_len = LUSTRE_JOBID_SIZE;
 133         int rc = 0;
 134         ENTRY;
 135
 136         memset(jobid, 0, LUSTRE_JOBID_SIZE);
 137         /* Jobstats isn't enabled */
 138         if (strcmp(obd_jobid_var, JOBSTATS_DISABLE) == 0)
 139                 RETURN(0);
 140
 141         /* Whole node dedicated to single job */
 142         if (strcmp(obd_jobid_var, JOBSTATS_NODELOCAL) == 0) {
 143                 memcpy(jobid, obd_jobid_node, LUSTRE_JOBID_SIZE);
 144                 RETURN(0);
 145         }
 146
 147         /* Use process name + fsuid as jobid */
 148         if (strcmp(obd_jobid_var, JOBSTATS_PROCNAME_UID) == 0) {
 149                 snprintf(jobid, LUSTRE_JOBID_SIZE, "%s.%u",
 150                          current_comm(),
 151                          from_kuid(&init_user_ns, current_fsuid()));
 152                 RETURN(0);
 153         }
 154
 155         rc = cfs_get_environ(obd_jobid_var, jobid, &jobid_len);
 156         if (rc) {
 157                 if (rc == -EOVERFLOW) {
 158                         /* For the PBS_JOBID and LOADL_STEP_ID keys (which are
 159                          * variable length strings instead of just numbers), it
 160                          * might make sense to keep the unique parts for JobID,
 161                          * instead of just returning an error.  That means a
 162                          * larger temp buffer for cfs_get_environ(), then
 163                          * truncating the string at some separator to fit into
 164                          * the specified jobid_len.  Fix later if needed. */
 165                         static bool printed;
 166                         if (unlikely(!printed)) {
 167                                 LCONSOLE_ERROR_MSG(0x16b, "%s value too large "
 168                                                    "for JobID buffer (%d)\n",
 169                                                    obd_jobid_var, jobid_len);
 170                                 printed = true;
 171                         }
 172                 } else {
 173                         CDEBUG((rc == -ENOENT || rc == -EINVAL ||
 174                                 rc == -EDEADLK) ? D_INFO : D_ERROR,
 175                                "Get jobid for (%s) failed: rc = %d\n",
 176                                obd_jobid_var, rc);
 177                 }
 178         }
 179         RETURN(rc);
 180 }
 181 EXPORT_SYMBOL(lustre_get_jobid);
 182
 183 static int class_resolve_dev_name(__u32 len, const char *name)
 184 {
 185         int rc;
 186         int dev;
 187
 188         ENTRY;
 189         if (!len || !name) {
 190                 CERROR("No name passed,!\n");
 191                 GOTO(out, rc = -EINVAL);
 192         }
 193         if (name[len - 1] != 0) {
 194                 CERROR("Name not nul terminated!\n");
 195                 GOTO(out, rc = -EINVAL);
 196         }
 197
 198         CDEBUG(D_IOCTL, "device name %s\n", name);
 199         dev = class_name2dev(name);
 200         if (dev == -1) {
 201                 CDEBUG(D_IOCTL, "No device for name %s!\n", name);
 202                 GOTO(out, rc = -EINVAL);
 203         }
 204
 205         CDEBUG(D_IOCTL, "device name %s, dev %d\n", name, dev);
 206         rc = dev;
 207
 208 out:
 209         RETURN(rc);
 210 }
 211
 212 int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 213 {
 214         char *buf = NULL;
 215         struct obd_ioctl_data *data;
 216         struct libcfs_debug_ioctl_data *debug_data;
 217         struct obd_device *obd = NULL;
 218         int err = 0, len = 0;
 219         ENTRY;
 220
 221         /* only for debugging */
 222         if (cmd == LIBCFS_IOC_DEBUG_MASK) {
 223                 debug_data = (struct libcfs_debug_ioctl_data*)arg;
 224                 libcfs_subsystem_debug = debug_data->subs;
 225                 libcfs_debug = debug_data->debug;
 226                 return 0;
 227         }
 228
 229         CDEBUG(D_IOCTL, "cmd = %x\n", cmd);
 230         if (obd_ioctl_getdata(&buf, &len, (void __user *)arg)) {
 231                 CERROR("OBD ioctl: data error\n");
 232                 RETURN(-EINVAL);
 233         }
 234         data = (struct obd_ioctl_data *)buf;
 235
 236         switch (cmd) {
 237         case OBD_IOC_PROCESS_CFG: {
 238                 struct lustre_cfg *lcfg;
 239
 240                 if (!data->ioc_plen1 || !data->ioc_pbuf1) {
 241                         CERROR("No config buffer passed!\n");
 242                         GOTO(out, err = -EINVAL);
 243                 }
 244                 OBD_ALLOC(lcfg, data->ioc_plen1);
 245                 if (lcfg == NULL)
 246                         GOTO(out, err = -ENOMEM);
 247                 err = copy_from_user(lcfg, data->ioc_pbuf1,
 248                                          data->ioc_plen1);
 249                 if (!err)
 250                         err = lustre_cfg_sanity_check(lcfg, data->ioc_plen1);
 251                 if (!err)
 252                         err = class_process_config(lcfg);
 253
 254                 OBD_FREE(lcfg, data->ioc_plen1);
 255                 GOTO(out, err);
 256         }
 257
 258         case OBD_GET_VERSION:
 259                 if (!data->ioc_inlbuf1) {
 260                         CERROR("No buffer passed in ioctl\n");
 261                         GOTO(out, err = -EINVAL);
 262                 }
 263
 264                 if (strlen(LUSTRE_VERSION_STRING) + 1 > data->ioc_inllen1) {
 265                         CERROR("ioctl buffer too small to hold version\n");
 266                         GOTO(out, err = -EINVAL);
 267                 }
 268
 269                 memcpy(data->ioc_bulk, LUSTRE_VERSION_STRING,
 270                        strlen(LUSTRE_VERSION_STRING) + 1);
 271
 272                 err = obd_ioctl_popdata((void __user *)arg, data, len);
 273                 if (err)
 274                         err = -EFAULT;
 275                 GOTO(out, err);
 276
 277         case OBD_IOC_NAME2DEV: {
 278                 /* Resolve a device name.  This does not change the
 279                  * currently selected device.
 280                  */
 281                 int dev;
 282
 283                 dev = class_resolve_dev_name(data->ioc_inllen1,
 284                                              data->ioc_inlbuf1);
 285                 data->ioc_dev = dev;
 286                 if (dev < 0)
 287                         GOTO(out, err = -EINVAL);
 288
 289                 err = obd_ioctl_popdata((void __user *)arg, data,
 290                                         sizeof(*data));
 291                 if (err)
 292                         err = -EFAULT;
 293                 GOTO(out, err);
 294         }
 295
 296         case OBD_IOC_UUID2DEV: {
 297                 /* Resolve a device uuid.  This does not change the
 298                  * currently selected device.
 299                  */
 300                 int dev;
 301                 struct obd_uuid uuid;
 302
 303                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 304                         CERROR("No UUID passed!\n");
 305                         GOTO(out, err = -EINVAL);
 306                 }
 307                 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
 308                         CERROR("UUID not NUL terminated!\n");
 309                         GOTO(out, err = -EINVAL);
 310                 }
 311
 312                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 313                 obd_str2uuid(&uuid, data->ioc_inlbuf1);
 314                 dev = class_uuid2dev(&uuid);
 315                 data->ioc_dev = dev;
 316                 if (dev == -1) {
 317                         CDEBUG(D_IOCTL, "No device for UUID %s!\n",
 318                                data->ioc_inlbuf1);
 319                         GOTO(out, err = -EINVAL);
 320                 }
 321
 322                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 323                        dev);
 324                 err = obd_ioctl_popdata((void __user *)arg, data,
 325                                         sizeof(*data));
 326                 if (err)
 327                         err = -EFAULT;
 328                 GOTO(out, err);
 329         }
 330
 331         case OBD_IOC_GETDEVICE: {
 332                 int     index = data->ioc_count;
 333                 char    *status, *str;
 334
 335                 if (!data->ioc_inlbuf1) {
 336                         CERROR("No buffer passed in ioctl\n");
 337                         GOTO(out, err = -EINVAL);
 338                 }
 339                 if (data->ioc_inllen1 < 128) {
 340                         CERROR("ioctl buffer too small to hold version\n");
 341                         GOTO(out, err = -EINVAL);
 342                 }
 343
 344                 obd = class_num2obd(index);
 345                 if (!obd)
 346                         GOTO(out, err = -ENOENT);
 347
 348                 if (obd->obd_stopping)
 349                         status = "ST";
 350                 else if (obd->obd_set_up)
 351                         status = "UP";
 352                 else if (obd->obd_attached)
 353                         status = "AT";
 354                 else
 355                         status = "--";
 356                 str = (char *)data->ioc_bulk;
 357                 snprintf(str, len - sizeof(*data), "%3d %s %s %s %s %d",
 358                          (int)index, status, obd->obd_type->typ_name,
 359                          obd->obd_name, obd->obd_uuid.uuid,
 360                          atomic_read(&obd->obd_refcount));
 361                 err = obd_ioctl_popdata((void __user *)arg, data, len);
 362
 363                 GOTO(out, err = 0);
 364         }
 365
 366         }
 367
 368         if (data->ioc_dev == OBD_DEV_BY_DEVNAME) {
 369                 if (data->ioc_inllen4 <= 0 || data->ioc_inlbuf4 == NULL)
 370                         GOTO(out, err = -EINVAL);
 371                 if (strnlen(data->ioc_inlbuf4, MAX_OBD_NAME) >= MAX_OBD_NAME)
 372                         GOTO(out, err = -EINVAL);
 373                 obd = class_name2obd(data->ioc_inlbuf4);
 374         } else if (data->ioc_dev < class_devno_max()) {
 375                 obd = class_num2obd(data->ioc_dev);
 376         } else {
 377                 CERROR("OBD ioctl: No device\n");
 378                 GOTO(out, err = -EINVAL);
 379         }
 380
 381         if (obd == NULL) {
 382                 CERROR("OBD ioctl : No Device %d\n", data->ioc_dev);
 383                 GOTO(out, err = -EINVAL);
 384         }
 385         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 386
 387         if (!obd->obd_set_up || obd->obd_stopping) {
 388                 CERROR("OBD ioctl: device not setup %d \n", data->ioc_dev);
 389                 GOTO(out, err = -EINVAL);
 390         }
 391
 392         switch(cmd) {
 393         case OBD_IOC_NO_TRANSNO: {
 394                 if (!obd->obd_attached) {
 395                         CERROR("Device %d not attached\n", obd->obd_minor);
 396                         GOTO(out, err = -ENODEV);
 397                 }
 398                 CDEBUG(D_HA, "%s: disabling committed-transno notification\n",
 399                        obd->obd_name);
 400                 obd->obd_no_transno = 1;
 401                 GOTO(out, err = 0);
 402         }
 403
 404         default: {
 405                 err = obd_iocontrol(cmd, obd->obd_self_export, len, data, NULL);
 406                 if (err)
 407                         GOTO(out, err);
 408
 409                 err = obd_ioctl_popdata((void __user *)arg, data, len);
 410                 if (err)
 411                         err = -EFAULT;
 412                 GOTO(out, err);
 413         }
 414         }
 415
 416  out:
 417         if (buf)
 418                 obd_ioctl_freedata(buf, len);
 419         RETURN(err);
 420 } /* class_handle_ioctl */
 421
 422 #define OBD_INIT_CHECK
 423 #ifdef OBD_INIT_CHECK
 424 static int obd_init_checks(void)
 425 {
 426         __u64 u64val, div64val;
 427         char buf[64];
 428         int len, ret = 0;
 429
 430         CDEBUG(D_INFO, "LPU64=%s, LPD64=%s, LPX64=%s\n", LPU64, LPD64, LPX64);
 431
 432         CDEBUG(D_INFO, "OBD_OBJECT_EOF = "LPX64"\n", (__u64)OBD_OBJECT_EOF);
 433
 434         u64val = OBD_OBJECT_EOF;
 435         CDEBUG(D_INFO, "u64val OBD_OBJECT_EOF = "LPX64"\n", u64val);
 436         if (u64val != OBD_OBJECT_EOF) {
 437                 CERROR("__u64 "LPX64"(%d) != 0xffffffffffffffff\n",
 438                        u64val, (int)sizeof(u64val));
 439                 ret = -EINVAL;
 440         }
 441         len = snprintf(buf, sizeof(buf), LPX64, u64val);
 442         if (len != 18) {
 443                 CWARN("LPX64 wrong length! strlen(%s)=%d != 18\n", buf, len);
 444                 ret = -EINVAL;
 445         }
 446
 447         div64val = OBD_OBJECT_EOF;
 448         CDEBUG(D_INFO, "u64val OBD_OBJECT_EOF = "LPX64"\n", u64val);
 449         if (u64val != OBD_OBJECT_EOF) {
 450                 CERROR("__u64 "LPX64"(%d) != 0xffffffffffffffff\n",
 451                        u64val, (int)sizeof(u64val));
 452                 ret = -EOVERFLOW;
 453         }
 454         if (u64val >> 8 != OBD_OBJECT_EOF >> 8) {
 455                 CERROR("__u64 "LPX64"(%d) != 0xffffffffffffffff\n",
 456                        u64val, (int)sizeof(u64val));
 457                 return -EOVERFLOW;
 458         }
 459         if (do_div(div64val, 256) != (u64val & 255)) {
 460                 CERROR("do_div("LPX64",256) != "LPU64"\n", u64val, u64val &255);
 461                 return -EOVERFLOW;
 462         }
 463         if (u64val >> 8 != div64val) {
 464                 CERROR("do_div("LPX64",256) "LPU64" != "LPU64"\n",
 465                        u64val, div64val, u64val >> 8);
 466                 return -EOVERFLOW;
 467         }
 468         len = snprintf(buf, sizeof(buf), LPX64, u64val);
 469         if (len != 18) {
 470                 CWARN("LPX64 wrong length! strlen(%s)=%d != 18\n", buf, len);
 471                 ret = -EINVAL;
 472         }
 473         len = snprintf(buf, sizeof(buf), LPU64, u64val);
 474         if (len != 20) {
 475                 CWARN("LPU64 wrong length! strlen(%s)=%d != 20\n", buf, len);
 476                 ret = -EINVAL;
 477         }
 478         len = snprintf(buf, sizeof(buf), LPD64, u64val);
 479         if (len != 2) {
 480                 CWARN("LPD64 wrong length! strlen(%s)=%d != 2\n", buf, len);
 481                 ret = -EINVAL;
 482         }
 483         if ((u64val & ~PAGE_CACHE_MASK) >= PAGE_CACHE_SIZE) {
 484                 CWARN("mask failed: u64val "LPU64" >= "LPU64"\n", u64val,
 485                       (__u64)PAGE_CACHE_SIZE);
 486                 ret = -EINVAL;
 487         }
 488
 489         return ret;
 490 }
 491 #else
 492 #define obd_init_checks() do {} while(0)
 493 #endif
 494
 495 static int __init obdclass_init(void)
 496 {
 497         int i, err;
 498
 499         spin_lock_init(&obd_stale_export_lock);
 500         INIT_LIST_HEAD(&obd_stale_exports);
 501         atomic_set(&obd_stale_export_num, 0);
 502
 503         LCONSOLE_INFO("Lustre: Build Version: "LUSTRE_VERSION_STRING"\n");
 504
 505         spin_lock_init(&obd_types_lock);
 506         obd_zombie_impexp_init();
 507 #ifdef CONFIG_PROC_FS
 508         obd_memory = lprocfs_alloc_stats(OBD_STATS_NUM,
 509                                          LPROCFS_STATS_FLAG_NONE |
 510                                          LPROCFS_STATS_FLAG_IRQ_SAFE);
 511         if (obd_memory == NULL) {
 512                 CERROR("kmalloc of 'obd_memory' failed\n");
 513                 RETURN(-ENOMEM);
 514         }
 515
 516         lprocfs_counter_init(obd_memory, OBD_MEMORY_STAT,
 517                              LPROCFS_CNTR_AVGMINMAX,
 518                              "memused", "bytes");
 519 #endif
 520         err = obd_init_checks();
 521         if (err == -EOVERFLOW)
 522                 return err;
 523
 524         class_init_uuidlist();
 525         err = class_handle_init();
 526         if (err)
 527                 return err;
 528
 529         INIT_LIST_HEAD(&obd_types);
 530
 531         err = misc_register(&obd_psdev);
 532         if (err) {
 533                 CERROR("cannot register %d err %d\n", OBD_DEV_MINOR, err);
 534                 return err;
 535         }
 536
 537         /* This struct is already zeroed for us (static global) */
 538         for (i = 0; i < class_devno_max(); i++)
 539                 obd_devs[i] = NULL;
 540
 541         /* Default the dirty page cache cap to 1/2 of system memory.
 542          * For clients with less memory, a larger fraction is needed
 543          * for other purposes (mostly for BGL). */
 544         if (totalram_pages <= 512 << (20 - PAGE_CACHE_SHIFT))
 545                 obd_max_dirty_pages = totalram_pages / 4;
 546         else
 547                 obd_max_dirty_pages = totalram_pages / 2;
 548
 549         err = obd_init_caches();
 550         if (err)
 551                 return err;
 552         err = class_procfs_init();
 553         if (err)
 554                 return err;
 555
 556         err = lu_global_init();
 557         if (err)
 558                 return err;
 559
 560         err = cl_global_init();
 561         if (err != 0)
 562                 return err;
 563
 564 #ifdef HAVE_SERVER_SUPPORT
 565         err = dt_global_init();
 566         if (err != 0)
 567                 return err;
 568
 569         err = lu_ucred_global_init();
 570         if (err != 0)
 571                 return err;
 572 #endif /* HAVE_SERVER_SUPPORT */
 573
 574         err = llog_info_init();
 575         if (err)
 576                 return err;
 577
 578         err = lustre_register_fs();
 579
 580         return err;
 581 }
 582
 583 void obd_update_maxusage(void)
 584 {
 585         __u64 max;
 586
 587         max = obd_memory_sum();
 588
 589         spin_lock(&obd_updatemax_lock);
 590         if (max > obd_max_alloc)
 591                 obd_max_alloc = max;
 592         spin_unlock(&obd_updatemax_lock);
 593 }
 594 EXPORT_SYMBOL(obd_update_maxusage);
 595
 596 #ifdef CONFIG_PROC_FS
 597 __u64 obd_memory_max(void)
 598 {
 599         __u64 ret;
 600
 601         obd_update_maxusage();
 602         spin_lock(&obd_updatemax_lock);
 603         ret = obd_max_alloc;
 604         spin_unlock(&obd_updatemax_lock);
 605
 606         return ret;
 607 }
 608 #endif /* CONFIG_PROC_FS */
 609
 610 static void __exit obdclass_exit(void)
 611 {
 612         __u64 memory_leaked;
 613         __u64 memory_max;
 614         ENTRY;
 615
 616         lustre_unregister_fs();
 617
 618         misc_deregister(&obd_psdev);
 619         llog_info_fini();
 620 #ifdef HAVE_SERVER_SUPPORT
 621         lu_ucred_global_fini();
 622         dt_global_fini();
 623 #endif /* HAVE_SERVER_SUPPORT */
 624         cl_global_fini();
 625         lu_global_fini();
 626
 627         obd_cleanup_caches();
 628         obd_sysctl_clean();
 629
 630         class_procfs_clean();
 631
 632         class_handle_cleanup();
 633         class_exit_uuidlist();
 634         obd_zombie_impexp_stop();
 635         LASSERT(list_empty(&obd_stale_exports));
 636
 637         memory_leaked = obd_memory_sum();
 638
 639         memory_max = obd_memory_max();
 640
 641         lprocfs_free_stats(&obd_memory);
 642         CDEBUG((memory_leaked) ? D_ERROR : D_INFO,
 643                "obd_memory max: "LPU64", leaked: "LPU64"\n",
 644                memory_max, memory_leaked);
 645
 646         EXIT;
 647 }
 648
 649 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
 650 MODULE_DESCRIPTION("Lustre Class Driver");
 651 MODULE_VERSION(LUSTRE_VERSION_STRING);
 652 MODULE_LICENSE("GPL");
 653
 654 module_init(obdclass_init);
 655 module_exit(obdclass_exit);