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 DECLARE_WAIT_QUEUE_HEAD(obd_race_waitq);
  92
  93 #ifdef __KERNEL__
  94 /*  opening /dev/obd */
  95 static int obd_class_open(struct inode * inode, struct file * file)
  96 {
  97         ENTRY;
  98
  99         PORTAL_MODULE_USE;
 100         RETURN(0);
 101 }
 102
 103 /*  closing /dev/obd */
 104 static int obd_class_release(struct inode * inode, struct file * file)
 105 {
 106         ENTRY;
 107
 108         PORTAL_MODULE_UNUSE;
 109         RETURN(0);
 110 }
 111 #endif
 112
 113 static inline void obd_data2conn(struct lustre_handle *conn,
 114                                  struct obd_ioctl_data *data)
 115 {
 116         memset(conn, 0, sizeof *conn);
 117         conn->cookie = data->ioc_cookie;
 118 }
 119
 120 static inline void obd_conn2data(struct obd_ioctl_data *data,
 121                                  struct lustre_handle *conn)
 122 {
 123         data->ioc_cookie = conn->cookie;
 124 }
 125
 126 int class_resolve_dev_name(uint32_t len, char *name)
 127 {
 128         int rc;
 129         int dev;
 130
 131         if (!len || !name) {
 132                 CERROR("No name passed,!\n");
 133                 GOTO(out, rc = -EINVAL);
 134         }
 135         if (name[len - 1] != 0) {
 136                 CERROR("Name not nul terminated!\n");
 137                 GOTO(out, rc = -EINVAL);
 138         }
 139
 140         CDEBUG(D_IOCTL, "device name %s\n", name);
 141         dev = class_name2dev(name);
 142         if (dev == -1) {
 143                 CDEBUG(D_IOCTL, "No device for name %s!\n", name);
 144                 GOTO(out, rc = -EINVAL);
 145         }
 146
 147         CDEBUG(D_IOCTL, "device name %s, dev %d\n", name, dev);
 148         rc = dev;
 149
 150 out:
 151         RETURN(rc);
 152 }
 153
 154 int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 155 {
 156         char *buf = NULL;
 157         struct obd_ioctl_data *data;
 158         struct portals_debug_ioctl_data *debug_data;
 159         struct obd_device *obd = NULL;
 160         int err = 0, len = 0, serialised = 0;
 161         ENTRY;
 162
 163         if (current->fsuid != 0)
 164                 RETURN(err = -EACCES);
 165
 166         if ((cmd & 0xffffff00) == ((int)'T') << 8) /* ignore all tty ioctls */
 167                 RETURN(err = -ENOTTY);
 168
 169         /* only for debugging */
 170         if (cmd == PTL_IOC_DEBUG_MASK) {
 171                 debug_data = (struct portals_debug_ioctl_data*)arg;
 172                 portal_subsystem_debug = debug_data->subs;
 173                 portal_debug = debug_data->debug;
 174                 return 0;
 175         }
 176
 177         switch (cmd) {
 178         case OBD_IOC_BRW_WRITE:
 179         case OBD_IOC_BRW_READ:
 180         case OBD_IOC_GETATTR:
 181         case ECHO_IOC_ENQUEUE:
 182         case ECHO_IOC_CANCEL:
 183         case OBD_IOC_CLIENT_RECOVER:
 184         case OBD_IOC_CATLOGLIST:
 185         case OBD_IOC_LLOG_INFO:
 186         case OBD_IOC_LLOG_PRINT:
 187         case OBD_IOC_LLOG_CANCEL:
 188         case OBD_IOC_LLOG_CHECK:
 189         case OBD_IOC_LLOG_REMOVE:
 190                 break;
 191         default:
 192                 down(&obd_conf_sem);
 193                 serialised = 1;
 194                 break;
 195         }
 196
 197         CDEBUG(D_IOCTL, "cmd = %x, obd = %p\n", cmd, obd);
 198         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 199                 CERROR("OBD ioctl: data error\n");
 200                 GOTO(out, err = -EINVAL);
 201         }
 202         data = (struct obd_ioctl_data *)buf;
 203
 204         switch (cmd) {
 205         case OBD_IOC_PROCESS_CFG: {
 206                 char *buf;
 207                 struct lustre_cfg *lcfg;
 208
 209                 if (!data->ioc_plen1 || !data->ioc_pbuf1) {
 210                         CERROR("No config buffer passed!\n");
 211                         GOTO(out, err = -EINVAL);
 212                 }
 213                 err = lustre_cfg_getdata(&buf, data->ioc_plen1,
 214                                          data->ioc_pbuf1, 0);
 215                 if (err)
 216                         GOTO(out, err);
 217                 lcfg = (struct lustre_cfg* ) buf;
 218
 219                 err = class_process_config(lcfg);
 220                 lustre_cfg_freedata(buf, data->ioc_plen1);
 221                 GOTO(out, err);
 222         }
 223
 224         case OBD_GET_VERSION:
 225                 if (!data->ioc_inlbuf1) {
 226                         CERROR("No buffer passed in ioctl\n");
 227                         GOTO(out, err = -EINVAL);
 228                 }
 229
 230                 if (strlen(BUILD_VERSION) + 1 > data->ioc_inllen1) {
 231                         CERROR("ioctl buffer too small to hold version\n");
 232                         GOTO(out, err = -EINVAL);
 233                 }
 234
 235                 memcpy(data->ioc_bulk, BUILD_VERSION,
 236                        strlen(BUILD_VERSION) + 1);
 237
 238                 err = copy_to_user((void *)arg, data, len);
 239                 if (err)
 240                         err = -EFAULT;
 241                 GOTO(out, err);
 242
 243         case OBD_IOC_NAME2DEV: {
 244                 /* Resolve a device name.  This does not change the
 245                  * currently selected device.
 246                  */
 247                 int dev;
 248
 249                 dev = class_resolve_dev_name(data->ioc_inllen1,
 250                                              data->ioc_inlbuf1);
 251                 data->ioc_dev = dev;
 252                 if (dev < 0)
 253                         GOTO(out, err = -EINVAL);
 254
 255                 err = copy_to_user((void *)arg, data, sizeof(*data));
 256                 if (err)
 257                         err = -EFAULT;
 258                 GOTO(out, err);
 259         }
 260
 261         case OBD_IOC_UUID2DEV: {
 262                 /* Resolve a device uuid.  This does not change the
 263                  * currently selected device.
 264                  */
 265                 int dev;
 266                 struct obd_uuid uuid;
 267
 268                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 269                         CERROR("No UUID passed!\n");
 270                         GOTO(out, err = -EINVAL);
 271                 }
 272                 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
 273                         CERROR("UUID not NUL terminated!\n");
 274                         GOTO(out, err = -EINVAL);
 275                 }
 276
 277                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 278                 obd_str2uuid(&uuid, data->ioc_inlbuf1);
 279                 dev = class_uuid2dev(&uuid);
 280                 data->ioc_dev = dev;
 281                 if (dev == -1) {
 282                         CDEBUG(D_IOCTL, "No device for UUID %s!\n",
 283                                data->ioc_inlbuf1);
 284                         GOTO(out, err = -EINVAL);
 285                 }
 286
 287                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 288                        dev);
 289                 err = copy_to_user((void *)arg, data, sizeof(*data));
 290                 if (err)
 291                         err = -EFAULT;
 292                 GOTO(out, err);
 293         }
 294
 295
 296         case OBD_IOC_CLOSE_UUID: {
 297                 struct lustre_peer peer;
 298                 CDEBUG(D_IOCTL, "closing all connections to uuid %s\n",
 299                        data->ioc_inlbuf1);
 300                 lustre_uuid_to_peer(data->ioc_inlbuf1, &peer);
 301                 GOTO(out, err = 0);
 302         }
 303
 304         }
 305
 306         if (data->ioc_dev >= MAX_OBD_DEVICES) {
 307                 CERROR("OBD ioctl: No device\n");
 308                 GOTO(out, err = -EINVAL);
 309         }
 310         obd = &obd_dev[data->ioc_dev];
 311         if (!(obd && obd->obd_set_up) || obd->obd_stopping) {
 312                 CERROR("OBD ioctl: device not setup %d \n", data->ioc_dev);
 313                 GOTO(out, err = -EINVAL);
 314         }
 315
 316         switch(cmd) {
 317         case OBD_IOC_NO_TRANSNO: {
 318                 if (!obd->obd_attached) {
 319                         CERROR("Device %d not attached\n", obd->obd_minor);
 320                         GOTO(out, err = -ENODEV);
 321                 }
 322                 CDEBUG(D_IOCTL,
 323                        "disabling committed-transno notifications on %d\n",
 324                        obd->obd_minor);
 325                 obd->obd_no_transno = 1;
 326                 GOTO(out, err = 0);
 327         }
 328
 329         default: {
 330                 err = obd_iocontrol(cmd, obd->obd_self_export, len, data, NULL);
 331                 if (err)
 332                         GOTO(out, err);
 333
 334                 err = copy_to_user((void *)arg, data, len);
 335                 if (err)
 336                         err = -EFAULT;
 337                 GOTO(out, err);
 338         }
 339         }
 340
 341  out:
 342         if (buf)
 343                 obd_ioctl_freedata(buf, len);
 344         if (serialised)
 345                 up(&obd_conf_sem);
 346         RETURN(err);
 347 } /* class_handle_ioctl */
 348
 349
 350
 351 #define OBD_MINOR 241
 352 #ifdef __KERNEL__
 353 /* to control /dev/obd */
 354 static int obd_class_ioctl(struct inode *inode, struct file *filp,
 355                            unsigned int cmd, unsigned long arg)
 356 {
 357         return class_handle_ioctl(cmd, arg);
 358 }
 359
 360 /* declare character device */
 361 static struct file_operations obd_psdev_fops = {
 362         ioctl:   obd_class_ioctl,       /* ioctl */
 363         open:    obd_class_open,        /* open */
 364         release: obd_class_release,     /* release */
 365 };
 366
 367 /* modules setup */
 368 static struct miscdevice obd_psdev = {
 369         OBD_MINOR,
 370         "obd_psdev",
 371         &obd_psdev_fops
 372 };
 373 #else
 374 void *obd_psdev = NULL;
 375 #endif
 376
 377 EXPORT_SYMBOL(obd_dev);
 378 EXPORT_SYMBOL(obdo_cachep);
 379 EXPORT_SYMBOL(obd_fail_loc);
 380 EXPORT_SYMBOL(obd_race_waitq);
 381 EXPORT_SYMBOL(obd_timeout);
 382 EXPORT_SYMBOL(obd_lustre_upcall);
 383 EXPORT_SYMBOL(obd_sync_filter);
 384 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
 385 EXPORT_SYMBOL(ptlrpc_abort_inflight_superhack);
 386 EXPORT_SYMBOL(proc_lustre_root);
 387
 388 EXPORT_SYMBOL(class_register_type);
 389 EXPORT_SYMBOL(class_unregister_type);
 390 EXPORT_SYMBOL(class_get_type);
 391 EXPORT_SYMBOL(class_put_type);
 392 EXPORT_SYMBOL(class_name2dev);
 393 EXPORT_SYMBOL(class_name2obd);
 394 EXPORT_SYMBOL(class_uuid2dev);
 395 EXPORT_SYMBOL(class_uuid2obd);
 396 EXPORT_SYMBOL(class_find_client_obd);
 397 EXPORT_SYMBOL(class_devices_in_group);
 398 EXPORT_SYMBOL(__class_export_put);
 399 EXPORT_SYMBOL(class_new_export);
 400 EXPORT_SYMBOL(class_unlink_export);
 401 EXPORT_SYMBOL(class_import_get);
 402 EXPORT_SYMBOL(class_import_put);
 403 EXPORT_SYMBOL(class_new_import);
 404 EXPORT_SYMBOL(class_destroy_import);
 405 EXPORT_SYMBOL(class_connect);
 406 EXPORT_SYMBOL(class_conn2export);
 407 EXPORT_SYMBOL(class_exp2obd);
 408 EXPORT_SYMBOL(class_conn2obd);
 409 EXPORT_SYMBOL(class_exp2cliimp);
 410 EXPORT_SYMBOL(class_conn2cliimp);
 411 EXPORT_SYMBOL(class_disconnect);
 412 EXPORT_SYMBOL(class_disconnect_exports);
 413
 414 EXPORT_SYMBOL(oig_init);
 415 EXPORT_SYMBOL(oig_release);
 416 EXPORT_SYMBOL(oig_add_one);
 417 EXPORT_SYMBOL(oig_wait);
 418 EXPORT_SYMBOL(oig_complete_one);
 419
 420 /* uuid.c */
 421 EXPORT_SYMBOL(class_uuid_unparse);
 422 EXPORT_SYMBOL(lustre_uuid_to_peer);
 423
 424 EXPORT_SYMBOL(class_handle_hash);
 425 EXPORT_SYMBOL(class_handle_unhash);
 426 EXPORT_SYMBOL(class_handle2object);
 427
 428 /* config.c */
 429 EXPORT_SYMBOL(class_get_profile);
 430 EXPORT_SYMBOL(class_del_profile);
 431 EXPORT_SYMBOL(class_process_config);
 432 EXPORT_SYMBOL(class_config_parse_llog);
 433 EXPORT_SYMBOL(class_config_dump_llog);
 434 EXPORT_SYMBOL(class_attach);
 435 EXPORT_SYMBOL(class_setup);
 436 EXPORT_SYMBOL(class_cleanup);
 437 EXPORT_SYMBOL(class_detach);
 438
 439 #ifdef LPROCFS
 440 int obd_proc_read_version(char *page, char **start, off_t off, int count,
 441                           int *eof, void *data)
 442 {
 443         *eof = 1;
 444         return snprintf(page, count, "%s\n", BUILD_VERSION);
 445 }
 446
 447 int obd_proc_read_pinger(char *page, char **start, off_t off, int count,
 448                          int *eof, void *data)
 449 {
 450         *eof = 1;
 451         return snprintf(page, count, "%s\n",
 452 #ifdef ENABLE_PINGER
 453                         "on"
 454 #else
 455                         "off"
 456 #endif
 457                        );
 458 }
 459
 460 /* Root for /proc/fs/lustre */
 461 struct proc_dir_entry *proc_lustre_root = NULL;
 462 struct lprocfs_vars lprocfs_base[] = {
 463         { "version", obd_proc_read_version, NULL, NULL },
 464         { "pinger", obd_proc_read_pinger, NULL, NULL },
 465         { 0 }
 466 };
 467
 468 static void *obd_device_list_seq_start(struct seq_file *p, loff_t*pos)
 469 {
 470         if (*pos >= MAX_OBD_DEVICES)
 471                 return NULL;
 472         return &obd_dev[*pos];
 473 }
 474
 475 static void obd_device_list_seq_stop(struct seq_file *p, void *v)
 476 {
 477 }
 478
 479 static void *obd_device_list_seq_next(struct seq_file *p, void *v, loff_t *pos)
 480 {
 481         ++*pos;
 482         if (*pos >= MAX_OBD_DEVICES)
 483                 return NULL;
 484         return &obd_dev[*pos];
 485 }
 486
 487 static int obd_device_list_seq_show(struct seq_file *p, void *v)
 488 {
 489         struct obd_device *obd = (struct obd_device *)v;
 490         int index = obd - &obd_dev[0];
 491         char *status;
 492
 493         if (!obd->obd_type)
 494                 return 0;
 495         if (obd->obd_stopping)
 496                 status = "ST";
 497         else if (obd->obd_set_up)
 498                 status = "UP";
 499         else if (obd->obd_attached)
 500                 status = "AT";
 501         else
 502                 status = "--";
 503
 504         return seq_printf(p, "%3d %s %s %s %s %d\n",
 505                           (int)index, status, obd->obd_type->typ_name,
 506                           obd->obd_name, obd->obd_uuid.uuid,
 507                           atomic_read(&obd->obd_refcount));
 508 }
 509
 510 struct seq_operations obd_device_list_sops = {
 511         .start = obd_device_list_seq_start,
 512         .stop = obd_device_list_seq_stop,
 513         .next = obd_device_list_seq_next,
 514         .show = obd_device_list_seq_show,
 515 };
 516
 517 static int obd_device_list_open(struct inode *inode, struct file *file)
 518 {
 519         struct proc_dir_entry *dp = PDE(inode);
 520         struct seq_file *seq;
 521         int rc = seq_open(file, &obd_device_list_sops);
 522
 523         if (rc)
 524                 return rc;
 525
 526         seq = file->private_data;
 527         seq->private = dp->data;
 528
 529         return 0;
 530 }
 531
 532 struct file_operations obd_device_list_fops = {
 533         .open = obd_device_list_open,
 534         .read = seq_read,
 535         .llseek = seq_lseek,
 536         .release = seq_release,
 537 };
 538 #endif
 539
 540 #ifdef __KERNEL__
 541 static int __init init_obdclass(void)
 542 #else
 543 int init_obdclass(void)
 544 #endif
 545 {
 546         struct obd_device *obd;
 547 #ifdef LPROCFS
 548         struct proc_dir_entry *entry;
 549 #endif
 550         int err;
 551         int i;
 552
 553         printk(KERN_INFO "Lustre: OBD class driver Build Version: "
 554                BUILD_VERSION", info@clusterfs.com\n");
 555
 556         class_init_uuidlist();
 557         err = class_handle_init();
 558         if (err)
 559                 return err;
 560
 561         sema_init(&obd_conf_sem, 1);
 562         INIT_LIST_HEAD(&obd_types);
 563
 564         err = misc_register(&obd_psdev);
 565         if (err) {
 566                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 567                 return err;
 568         }
 569
 570         /* This struct is already zerod for us (static global) */
 571         for (i = 0, obd = obd_dev; i < MAX_OBD_DEVICES; i++, obd++)
 572                 obd->obd_minor = i;
 573
 574         err = obd_init_caches();
 575         if (err)
 576                 return err;
 577
 578 #ifdef __KERNEL__
 579         obd_sysctl_init();
 580 #endif
 581
 582 #ifdef LPROCFS
 583         proc_lustre_root = proc_mkdir("lustre", proc_root_fs);
 584         if (!proc_lustre_root) {
 585                 printk(KERN_ERR
 586                        "LustreError: error registering /proc/fs/lustre\n");
 587                 RETURN(-ENOMEM);
 588         }
 589         proc_version = lprocfs_add_vars(proc_lustre_root, lprocfs_base, NULL);
 590         entry = create_proc_entry("devices", 0444, proc_lustre_root);
 591         if (entry == NULL) {
 592                 printk(KERN_ERR "LustreError: error registering "
 593                        "/proc/fs/lustre/devices\n");
 594                 lprocfs_remove(proc_lustre_root);
 595                 RETURN(-ENOMEM);
 596         }
 597         entry->proc_fops = &obd_device_list_fops;
 598 #endif
 599         return 0;
 600 }
 601
 602 #ifdef __KERNEL__
 603 static void /*__exit*/ cleanup_obdclass(void)
 604 #else
 605 static void cleanup_obdclass(void)
 606 #endif
 607 {
 608 #ifdef __KERNEL__
 609         int i;
 610 #else
 611         int i, leaked;
 612 #endif
 613         ENTRY;
 614
 615         misc_deregister(&obd_psdev);
 616         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 617                 struct obd_device *obd = &obd_dev[i];
 618                 if (obd->obd_type && obd->obd_set_up &&
 619                     OBT(obd) && OBP(obd, detach)) {
 620                         /* XXX should this call generic detach otherwise? */
 621                         OBP(obd, detach)(obd);
 622                 }
 623         }
 624
 625         obd_cleanup_caches();
 626 #ifdef __KERNEL__
 627         obd_sysctl_clean();
 628 #endif
 629 #ifdef LPROCFS
 630         if (proc_lustre_root) {
 631                 lprocfs_remove(proc_lustre_root);
 632                 proc_lustre_root = NULL;
 633         }
 634 #endif
 635
 636         class_handle_cleanup();
 637         class_exit_uuidlist();
 638
 639 #ifndef __KERNEL__
 640         leaked = atomic_read(&obd_memory);
 641         CDEBUG(leaked ? D_ERROR : D_INFO,
 642                "obd mem max: %d leaked: %d\n", obd_memmax, leaked);
 643 #endif
 644
 645         EXIT;
 646 }
 647
 648 /* Check that we're building against the appropriate version of the Lustre
 649  * kernel patch */
 650 #ifdef __KERNEL__
 651 #include <linux/lustre_version.h>
 652 #define LUSTRE_MIN_VERSION 28
 653 #define LUSTRE_MAX_VERSION 34
 654 #if (LUSTRE_KERNEL_VERSION < LUSTRE_MIN_VERSION)
 655 # error Cannot continue: Your Lustre kernel patch is older than the sources
 656 #elif (LUSTRE_KERNEL_VERSION > LUSTRE_MAX_VERSION)
 657 # error Cannot continue: Your Lustre sources are older than the kernel patch
 658 #endif
 659  #else
 660 # warning "Lib Lustre - no versioning information"
 661 #endif
 662
 663 #ifdef __KERNEL__
 664 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 665 MODULE_DESCRIPTION("Lustre Class Driver Build Version: " BUILD_VERSION);
 666 MODULE_LICENSE("GPL");
 667
 668 module_init(init_obdclass);
 669 module_exit(cleanup_obdclass);
 670 #endif