lustre/obdclass/class_obd.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Object Devices Class Driver
   5  *
   6  *  Copyright (C) 2001-2003 Cluster File Systems, Inc.
   7  *
   8  *   This file is part of Lustre, http://www.lustre.org.
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * These are the only exported functions, they provide some generic
  24  * infrastructure for managing object devices
  25  */
  26
  27 #define DEBUG_SUBSYSTEM S_CLASS
  28 #ifndef EXPORT_SYMTAB
  29 # define EXPORT_SYMTAB
  30 #endif
  31 #ifdef __KERNEL__
  32 #include <linux/config.h> /* for CONFIG_PROC_FS */
  33 #include <linux/module.h>
  34 #include <linux/errno.h>
  35 #include <linux/kernel.h>
  36 #include <linux/major.h>
  37 #include <linux/sched.h>
  38 #include <linux/lp.h>
  39 #include <linux/slab.h>
  40 #include <linux/ioport.h>
  41 #include <linux/fcntl.h>
  42 #include <linux/delay.h>
  43 #include <linux/skbuff.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/fs.h>
  46 #include <linux/poll.h>
  47 #include <linux/init.h>
  48 #include <linux/list.h>
  49 #include <linux/highmem.h>
  50 #include <asm/io.h>
  51 #include <asm/ioctls.h>
  52 #include <asm/system.h>
  53 #include <asm/poll.h>
  54 #include <asm/uaccess.h>
  55 #include <linux/miscdevice.h>
  56 #include <linux/smp_lock.h>
  57 #include <linux/seq_file.h>
  58 #else
  59 # include <liblustre.h>
  60 #endif
  61
  62 #include <linux/obd_support.h>
  63 #include <linux/obd_class.h>
  64 #include <linux/lustre_debug.h>
  65 #include <linux/lprocfs_status.h>
  66 #include <linux/lustre_build_version.h>
  67 #include <portals/list.h>
  68 #include "llog_internal.h"
  69
  70 #ifndef __KERNEL__
  71 /* liblustre workaround */
  72 atomic_t portal_kmemory = {0};
  73 #endif
  74
  75 struct semaphore obd_conf_sem;   /* serialize configuration commands */
  76 struct obd_device obd_dev[MAX_OBD_DEVICES];
  77 struct list_head obd_types;
  78 #ifndef __KERNEL__
  79 atomic_t obd_memory;
  80 int obd_memmax;
  81 #endif
  82
  83 int proc_version;
  84
  85 /* The following are visible and mutable through /proc/sys/lustre/. */
  86 unsigned int obd_fail_loc;
  87 unsigned int obd_timeout = 100;
  88 char obd_lustre_upcall[128] = "DEFAULT"; /* or NONE or /full/path/to/upcall  */
  89 unsigned int obd_sync_filter; /* = 0, don't sync by default */
  90
  91 #ifdef __KERNEL__
  92 /*  opening /dev/obd */
  93 static int obd_class_open(struct inode * inode, struct file * file)
  94 {
  95         ENTRY;
  96
  97         PORTAL_MODULE_USE;
  98         RETURN(0);
  99 }
 100
 101 /*  closing /dev/obd */
 102 static int obd_class_release(struct inode * inode, struct file * file)
 103 {
 104         ENTRY;
 105
 106         PORTAL_MODULE_UNUSE;
 107         RETURN(0);
 108 }
 109 #endif
 110
 111 static inline void obd_data2conn(struct lustre_handle *conn,
 112                                  struct obd_ioctl_data *data)
 113 {
 114         memset(conn, 0, sizeof *conn);
 115         conn->cookie = data->ioc_cookie;
 116 }
 117
 118 static inline void obd_conn2data(struct obd_ioctl_data *data,
 119                                  struct lustre_handle *conn)
 120 {
 121         data->ioc_cookie = conn->cookie;
 122 }
 123
 124 int class_resolve_dev_name(uint32_t len, char *name)
 125 {
 126         int rc;
 127         int dev;
 128
 129         if (!len || !name) {
 130                 CERROR("No name passed,!\n");
 131                 GOTO(out, rc = -EINVAL);
 132         }
 133         if (name[len - 1] != 0) {
 134                 CERROR("Name not nul terminated!\n");
 135                 GOTO(out, rc = -EINVAL);
 136         }
 137
 138         CDEBUG(D_IOCTL, "device name %s\n", name);
 139         dev = class_name2dev(name);
 140         if (dev == -1) {
 141                 CDEBUG(D_IOCTL, "No device for name %s!\n", name);
 142                 GOTO(out, rc = -EINVAL);
 143         }
 144
 145         CDEBUG(D_IOCTL, "device name %s, dev %d\n", name, dev);
 146         rc = dev;
 147
 148 out:
 149         RETURN(rc);
 150 }
 151
 152 int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 153 {
 154         char *buf = NULL;
 155         struct obd_ioctl_data *data;
 156         struct portals_debug_ioctl_data *debug_data;
 157         struct obd_device *obd = NULL;
 158         int err = 0, len = 0, serialised = 0;
 159         ENTRY;
 160
 161         if (current->fsuid != 0)
 162                 RETURN(err = -EACCES);
 163
 164         if ((cmd & 0xffffff00) == ((int)'T') << 8) /* ignore all tty ioctls */
 165                 RETURN(err = -ENOTTY);
 166
 167         /* only for debugging */
 168         if (cmd == PTL_IOC_DEBUG_MASK) {
 169                 debug_data = (struct portals_debug_ioctl_data*)arg;
 170                 portal_subsystem_debug = debug_data->subs;
 171                 portal_debug = debug_data->debug;
 172                 return 0;
 173         }
 174
 175         switch (cmd) {
 176         case OBD_IOC_BRW_WRITE:
 177         case OBD_IOC_BRW_READ:
 178         case OBD_IOC_GETATTR:
 179         case ECHO_IOC_ENQUEUE:
 180         case ECHO_IOC_CANCEL:
 181         case OBD_IOC_CLIENT_RECOVER:
 182         case OBD_IOC_CATLOGLIST:
 183         case OBD_IOC_LLOG_INFO:
 184         case OBD_IOC_LLOG_PRINT:
 185         case OBD_IOC_LLOG_CANCEL:
 186         case OBD_IOC_LLOG_CHECK:
 187         case OBD_IOC_LLOG_REMOVE:
 188                 break;
 189         default:
 190                 down(&obd_conf_sem);
 191                 serialised = 1;
 192                 break;
 193         }
 194
 195         CDEBUG(D_IOCTL, "cmd = %x, obd = %p\n", cmd, obd);
 196         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 197                 CERROR("OBD ioctl: data error\n");
 198                 GOTO(out, err = -EINVAL);
 199         }
 200         data = (struct obd_ioctl_data *)buf;
 201
 202         switch (cmd) {
 203         case OBD_IOC_PROCESS_CFG: {
 204                 char *buf;
 205                 struct lustre_cfg *lcfg;
 206
 207                 if (!data->ioc_plen1 || !data->ioc_pbuf1) {
 208                         CERROR("No config buffer passed!\n");
 209                         GOTO(out, err = -EINVAL);
 210                 }
 211                 err = lustre_cfg_getdata(&buf, data->ioc_plen1,
 212                                          data->ioc_pbuf1, 0);
 213                 if (err)
 214                         GOTO(out, err);
 215                 lcfg = (struct lustre_cfg* ) buf;
 216
 217                 err = class_process_config(lcfg);
 218                 lustre_cfg_freedata(buf, data->ioc_plen1);
 219                 GOTO(out, err);
 220         }
 221
 222         case OBD_GET_VERSION:
 223                 if (!data->ioc_inlbuf1) {
 224                         CERROR("No buffer passed in ioctl\n");
 225                         GOTO(out, err = -EINVAL);
 226                 }
 227
 228                 if (strlen(BUILD_VERSION) + 1 > data->ioc_inllen1) {
 229                         CERROR("ioctl buffer too small to hold version\n");
 230                         GOTO(out, err = -EINVAL);
 231                 }
 232
 233                 memcpy(data->ioc_bulk, BUILD_VERSION,
 234                        strlen(BUILD_VERSION) + 1);
 235
 236                 err = copy_to_user((void *)arg, data, len);
 237                 if (err)
 238                         err = -EFAULT;
 239                 GOTO(out, err);
 240
 241         case OBD_IOC_NAME2DEV: {
 242                 /* Resolve a device name.  This does not change the
 243                  * currently selected device.
 244                  */
 245                 int dev;
 246
 247                 dev = class_resolve_dev_name(data->ioc_inllen1,
 248                                              data->ioc_inlbuf1);
 249                 data->ioc_dev = dev;
 250                 if (dev < 0)
 251                         GOTO(out, err = -EINVAL);
 252
 253                 err = copy_to_user((void *)arg, data, sizeof(*data));
 254                 if (err)
 255                         err = -EFAULT;
 256                 GOTO(out, err);
 257         }
 258
 259         case OBD_IOC_UUID2DEV: {
 260                 /* Resolve a device uuid.  This does not change the
 261                  * currently selected device.
 262                  */
 263                 int dev;
 264                 struct obd_uuid uuid;
 265
 266                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 267                         CERROR("No UUID passed!\n");
 268                         GOTO(out, err = -EINVAL);
 269                 }
 270                 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
 271                         CERROR("UUID not NUL terminated!\n");
 272                         GOTO(out, err = -EINVAL);
 273                 }
 274
 275                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 276                 obd_str2uuid(&uuid, data->ioc_inlbuf1);
 277                 dev = class_uuid2dev(&uuid);
 278                 data->ioc_dev = dev;
 279                 if (dev == -1) {
 280                         CDEBUG(D_IOCTL, "No device for UUID %s!\n",
 281                                data->ioc_inlbuf1);
 282                         GOTO(out, err = -EINVAL);
 283                 }
 284
 285                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 286                        dev);
 287                 err = copy_to_user((void *)arg, data, sizeof(*data));
 288                 if (err)
 289                         err = -EFAULT;
 290                 GOTO(out, err);
 291         }
 292
 293
 294         case OBD_IOC_CLOSE_UUID: {
 295                 struct lustre_peer peer;
 296                 CDEBUG(D_IOCTL, "closing all connections to uuid %s\n",
 297                        data->ioc_inlbuf1);
 298                 lustre_uuid_to_peer(data->ioc_inlbuf1, &peer);
 299                 GOTO(out, err = 0);
 300         }
 301
 302         }
 303
 304         if (data->ioc_dev >= MAX_OBD_DEVICES) {
 305                 CERROR("OBD ioctl: No device\n");
 306                 GOTO(out, err = -EINVAL);
 307         }
 308         obd = &obd_dev[data->ioc_dev];
 309         if (!(obd && obd->obd_set_up) || obd->obd_stopping) {
 310                 CERROR("OBD ioctl: device not setup %d \n", data->ioc_dev);
 311                 GOTO(out, err = -EINVAL);
 312         }
 313
 314         switch(cmd) {
 315         case OBD_IOC_NO_TRANSNO: {
 316                 if (!obd->obd_attached) {
 317                         CERROR("Device %d not attached\n", obd->obd_minor);
 318                         GOTO(out, err = -ENODEV);
 319                 }
 320                 CDEBUG(D_IOCTL,
 321                        "disabling committed-transno notifications on %d\n",
 322                        obd->obd_minor);
 323                 obd->obd_no_transno = 1;
 324                 GOTO(out, err = 0);
 325         }
 326
 327         default: {
 328                 err = obd_iocontrol(cmd, obd->obd_self_export, len, data, NULL);
 329                 if (err)
 330                         GOTO(out, err);
 331
 332                 err = copy_to_user((void *)arg, data, len);
 333                 if (err)
 334                         err = -EFAULT;
 335                 GOTO(out, err);
 336         }
 337         }
 338
 339  out:
 340         if (buf)
 341                 obd_ioctl_freedata(buf, len);
 342         if (serialised)
 343                 up(&obd_conf_sem);
 344         RETURN(err);
 345 } /* class_handle_ioctl */
 346
 347
 348
 349 #define OBD_MINOR 241
 350 #ifdef __KERNEL__
 351 /* to control /dev/obd */
 352 static int obd_class_ioctl(struct inode *inode, struct file *filp,
 353                            unsigned int cmd, unsigned long arg)
 354 {
 355         return class_handle_ioctl(cmd, arg);
 356 }
 357
 358 /* declare character device */
 359 static struct file_operations obd_psdev_fops = {
 360         ioctl:   obd_class_ioctl,       /* ioctl */
 361         open:    obd_class_open,        /* open */
 362         release: obd_class_release,     /* release */
 363 };
 364
 365 /* modules setup */
 366 static struct miscdevice obd_psdev = {
 367         OBD_MINOR,
 368         "obd_psdev",
 369         &obd_psdev_fops
 370 };
 371 #else
 372 void *obd_psdev = NULL;
 373 #endif
 374
 375 EXPORT_SYMBOL(obd_dev);
 376 EXPORT_SYMBOL(obdo_cachep);
 377 EXPORT_SYMBOL(obd_fail_loc);
 378 EXPORT_SYMBOL(obd_timeout);
 379 EXPORT_SYMBOL(obd_lustre_upcall);
 380 EXPORT_SYMBOL(obd_sync_filter);
 381 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
 382 EXPORT_SYMBOL(ptlrpc_abort_inflight_superhack);
 383 EXPORT_SYMBOL(proc_lustre_root);
 384
 385 EXPORT_SYMBOL(class_register_type);
 386 EXPORT_SYMBOL(class_unregister_type);
 387 EXPORT_SYMBOL(class_get_type);
 388 EXPORT_SYMBOL(class_put_type);
 389 EXPORT_SYMBOL(class_name2dev);
 390 EXPORT_SYMBOL(class_name2obd);
 391 EXPORT_SYMBOL(class_uuid2dev);
 392 EXPORT_SYMBOL(class_uuid2obd);
 393 EXPORT_SYMBOL(class_find_client_obd);
 394 EXPORT_SYMBOL(class_devices_in_group);
 395 EXPORT_SYMBOL(__class_export_put);
 396 EXPORT_SYMBOL(class_new_export);
 397 EXPORT_SYMBOL(class_unlink_export);
 398 EXPORT_SYMBOL(class_import_get);
 399 EXPORT_SYMBOL(class_import_put);
 400 EXPORT_SYMBOL(class_new_import);
 401 EXPORT_SYMBOL(class_destroy_import);
 402 EXPORT_SYMBOL(class_connect);
 403 EXPORT_SYMBOL(class_conn2export);
 404 EXPORT_SYMBOL(class_exp2obd);
 405 EXPORT_SYMBOL(class_conn2obd);
 406 EXPORT_SYMBOL(class_exp2cliimp);
 407 EXPORT_SYMBOL(class_conn2cliimp);
 408 EXPORT_SYMBOL(class_disconnect);
 409 EXPORT_SYMBOL(class_disconnect_exports);
 410
 411 EXPORT_SYMBOL(oig_init);
 412 EXPORT_SYMBOL(oig_release);
 413 EXPORT_SYMBOL(oig_add_one);
 414 EXPORT_SYMBOL(oig_wait);
 415 EXPORT_SYMBOL(oig_complete_one);
 416
 417 /* uuid.c */
 418 EXPORT_SYMBOL(class_uuid_unparse);
 419 EXPORT_SYMBOL(lustre_uuid_to_peer);
 420
 421 EXPORT_SYMBOL(class_handle_hash);
 422 EXPORT_SYMBOL(class_handle_unhash);
 423 EXPORT_SYMBOL(class_handle2object);
 424
 425 /* config.c */
 426 EXPORT_SYMBOL(class_get_profile);
 427 EXPORT_SYMBOL(class_del_profile);
 428 EXPORT_SYMBOL(class_process_config);
 429 EXPORT_SYMBOL(class_config_parse_llog);
 430 EXPORT_SYMBOL(class_config_dump_llog);
 431 EXPORT_SYMBOL(class_attach);
 432 EXPORT_SYMBOL(class_setup);
 433 EXPORT_SYMBOL(class_cleanup);
 434 EXPORT_SYMBOL(class_detach);
 435
 436 #ifdef LPROCFS
 437 int obd_proc_read_version(char *page, char **start, off_t off, int count,
 438                           int *eof, void *data)
 439 {
 440         *eof = 1;
 441         return snprintf(page, count, "%s\n", BUILD_VERSION);
 442 }
 443
 444 int obd_proc_read_pinger(char *page, char **start, off_t off, int count,
 445                          int *eof, void *data)
 446 {
 447         *eof = 1;
 448         return snprintf(page, count, "%s\n",
 449 #ifdef ENABLE_PINGER
 450                         "on"
 451 #else
 452                         "off"
 453 #endif
 454                        );
 455 }
 456
 457 /* Root for /proc/fs/lustre */
 458 struct proc_dir_entry *proc_lustre_root = NULL;
 459 struct lprocfs_vars lprocfs_base[] = {
 460         { "version", obd_proc_read_version, NULL, NULL },
 461         { "pinger", obd_proc_read_pinger, NULL, NULL },
 462         { 0 }
 463 };
 464
 465 static void *obd_device_list_seq_start(struct seq_file *p, loff_t*pos)
 466 {
 467         if (*pos >= MAX_OBD_DEVICES)
 468                 return NULL;
 469         return &obd_dev[*pos];
 470 }
 471
 472 static void obd_device_list_seq_stop(struct seq_file *p, void *v)
 473 {
 474 }
 475
 476 static void *obd_device_list_seq_next(struct seq_file *p, void *v, loff_t *pos)
 477 {
 478         ++*pos;
 479         if (*pos >= MAX_OBD_DEVICES)
 480                 return NULL;
 481         return &obd_dev[*pos];
 482 }
 483
 484 static int obd_device_list_seq_show(struct seq_file *p, void *v)
 485 {
 486         struct obd_device *obd = (struct obd_device *)v;
 487         int index = obd - &obd_dev[0];
 488         char *status;
 489
 490         if (!obd->obd_type)
 491                 return 0;
 492         if (obd->obd_stopping)
 493                 status = "ST";
 494         else if (obd->obd_set_up)
 495                 status = "UP";
 496         else if (obd->obd_attached)
 497                 status = "AT";
 498         else
 499                 status = "--";
 500
 501         return seq_printf(p, "%3d %s %s %s %s %d\n",
 502                           (int)index, status, obd->obd_type->typ_name,
 503                           obd->obd_name, obd->obd_uuid.uuid,
 504                           atomic_read(&obd->obd_refcount));
 505 }
 506
 507 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 proc_dir_entry *dp = PDE(inode);
 517         struct seq_file *seq;
 518         int rc = seq_open(file, &obd_device_list_sops);
 519
 520         if (rc)
 521                 return rc;
 522
 523         seq = file->private_data;
 524         seq->private = dp->data;
 525
 526         return 0;
 527 }
 528
 529 struct file_operations obd_device_list_fops = {
 530         .open = obd_device_list_open,
 531         .read = seq_read,
 532         .llseek = seq_lseek,
 533         .release = seq_release,
 534 };
 535 #endif
 536
 537 #ifdef __KERNEL__
 538 static int __init init_obdclass(void)
 539 #else
 540 int init_obdclass(void)
 541 #endif
 542 {
 543         struct obd_device *obd;
 544 #ifdef LPROCFS
 545         struct proc_dir_entry *entry;
 546 #endif
 547         int err;
 548         int i;
 549
 550         printk(KERN_INFO "Lustre: OBD class driver Build Version: "
 551                BUILD_VERSION", info@clusterfs.com\n");
 552
 553         class_init_uuidlist();
 554         err = class_handle_init();
 555         if (err)
 556                 return err;
 557
 558         sema_init(&obd_conf_sem, 1);
 559         INIT_LIST_HEAD(&obd_types);
 560
 561         err = misc_register(&obd_psdev);
 562         if (err) {
 563                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 564                 return err;
 565         }
 566
 567         /* This struct is already zerod for us (static global) */
 568         for (i = 0, obd = obd_dev; i < MAX_OBD_DEVICES; i++, obd++)
 569                 obd->obd_minor = i;
 570
 571         err = obd_init_caches();
 572         if (err)
 573                 return err;
 574
 575 #ifdef __KERNEL__
 576         obd_sysctl_init();
 577 #endif
 578
 579 #ifdef LPROCFS
 580         proc_lustre_root = proc_mkdir("lustre", proc_root_fs);
 581         if (!proc_lustre_root) {
 582                 printk(KERN_ERR
 583                        "LustreError: error registering /proc/fs/lustre\n");
 584                 RETURN(-ENOMEM);
 585         }
 586         proc_version = lprocfs_add_vars(proc_lustre_root, lprocfs_base, NULL);
 587         entry = create_proc_entry("devices", 0444, proc_lustre_root);
 588         if (entry == NULL) {
 589                 printk(KERN_ERR "LustreError: error registering "
 590                        "/proc/fs/lustre/devices\n");
 591                 lprocfs_remove(proc_lustre_root);
 592                 RETURN(-ENOMEM);
 593         }
 594         entry->proc_fops = &obd_device_list_fops;
 595 #endif
 596         return 0;
 597 }
 598
 599 #ifdef __KERNEL__
 600 static void /*__exit*/ cleanup_obdclass(void)
 601 #else
 602 static void cleanup_obdclass(void)
 603 #endif
 604 {
 605 #ifdef __KERNEL__
 606         int i;
 607 #else
 608         int i, leaked;
 609 #endif
 610         ENTRY;
 611
 612         misc_deregister(&obd_psdev);
 613         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 614                 struct obd_device *obd = &obd_dev[i];
 615                 if (obd->obd_type && obd->obd_set_up &&
 616                     OBT(obd) && OBP(obd, detach)) {
 617                         /* XXX should this call generic detach otherwise? */
 618                         OBP(obd, detach)(obd);
 619                 }
 620         }
 621
 622         obd_cleanup_caches();
 623 #ifdef __KERNEL__
 624         obd_sysctl_clean();
 625 #endif
 626 #ifdef LPROCFS
 627         if (proc_lustre_root) {
 628                 lprocfs_remove(proc_lustre_root);
 629                 proc_lustre_root = NULL;
 630         }
 631 #endif
 632
 633         class_handle_cleanup();
 634         class_exit_uuidlist();
 635
 636 #ifndef __KERNEL__
 637         leaked = atomic_read(&obd_memory);
 638         CDEBUG(leaked ? D_ERROR : D_INFO,
 639                "obd mem max: %d leaked: %d\n", obd_memmax, leaked);
 640 #endif
 641
 642         EXIT;
 643 }
 644
 645 /* Check that we're building against the appropriate version of the Lustre
 646  * kernel patch */
 647 #ifdef __KERNEL__
 648 #include <linux/lustre_version.h>
 649 #define LUSTRE_MIN_VERSION 28
 650 #define LUSTRE_MAX_VERSION 33
 651 #if (LUSTRE_KERNEL_VERSION < LUSTRE_MIN_VERSION)
 652 # error Cannot continue: Your Lustre kernel patch is older than the sources
 653 #elif (LUSTRE_KERNEL_VERSION > LUSTRE_MAX_VERSION)
 654 # error Cannot continue: Your Lustre sources are older than the kernel patch
 655 #endif
 656  #else
 657 # warning "Lib Lustre - no versioning information"
 658 #endif
 659
 660 #ifdef __KERNEL__
 661 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 662 MODULE_DESCRIPTION("Lustre Class Driver Build Version: " BUILD_VERSION);
 663 MODULE_LICENSE("GPL");
 664
 665 module_init(init_obdclass);
 666 module_exit(cleanup_obdclass);
 667 #endif