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 #ifdef __KERNEL__
  67 #include <linux/lustre_build_version.h>
  68 #endif
  69 #include <portals/list.h>
  70 #include "llog_internal.h"
  71
  72 #ifndef __KERNEL__
  73 /* liblustre workaround */
  74 atomic_t portal_kmemory = {0};
  75 #endif
  76
  77 struct semaphore obd_conf_sem;   /* serialize configuration commands */
  78 struct obd_device obd_dev[MAX_OBD_DEVICES];
  79 struct list_head obd_types;
  80 #ifndef __KERNEL__
  81 atomic_t obd_memory;
  82 int obd_memmax;
  83 #endif
  84
  85 int proc_version;
  86
  87 /* The following are visible and mutable through /proc/sys/lustre/. */
  88 unsigned int obd_fail_loc;
  89 unsigned int obd_timeout = 100;
  90 char obd_lustre_upcall[128] = "DEFAULT"; /* or NONE or /full/path/to/upcall  */
  91 unsigned int obd_sync_filter; /* = 0, don't sync by default */
  92
  93 DECLARE_WAIT_QUEUE_HEAD(obd_race_waitq);
  94
  95 #ifdef __KERNEL__
  96 /*  opening /dev/obd */
  97 static int obd_class_open(struct inode * inode, struct file * file)
  98 {
  99         ENTRY;
 100
 101         PORTAL_MODULE_USE;
 102         RETURN(0);
 103 }
 104
 105 /*  closing /dev/obd */
 106 static int obd_class_release(struct inode * inode, struct file * file)
 107 {
 108         ENTRY;
 109
 110         PORTAL_MODULE_UNUSE;
 111         RETURN(0);
 112 }
 113 #endif
 114
 115 static inline void obd_data2conn(struct lustre_handle *conn,
 116                                  struct obd_ioctl_data *data)
 117 {
 118         memset(conn, 0, sizeof *conn);
 119         conn->cookie = data->ioc_cookie;
 120 }
 121
 122 static inline void obd_conn2data(struct obd_ioctl_data *data,
 123                                  struct lustre_handle *conn)
 124 {
 125         data->ioc_cookie = conn->cookie;
 126 }
 127
 128 int class_resolve_dev_name(uint32_t len, char *name)
 129 {
 130         int rc;
 131         int dev;
 132
 133         if (!len || !name) {
 134                 CERROR("No name passed,!\n");
 135                 GOTO(out, rc = -EINVAL);
 136         }
 137         if (name[len - 1] != 0) {
 138                 CERROR("Name not nul terminated!\n");
 139                 GOTO(out, rc = -EINVAL);
 140         }
 141
 142         CDEBUG(D_IOCTL, "device name %s\n", name);
 143         dev = class_name2dev(name);
 144         if (dev == -1) {
 145                 CDEBUG(D_IOCTL, "No device for name %s!\n", name);
 146                 GOTO(out, rc = -EINVAL);
 147         }
 148
 149         CDEBUG(D_IOCTL, "device name %s, dev %d\n", name, dev);
 150         rc = dev;
 151
 152 out:
 153         RETURN(rc);
 154 }
 155
 156 int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 157 {
 158         char *buf = NULL;
 159         struct obd_ioctl_data *data;
 160         struct portals_debug_ioctl_data *debug_data;
 161         struct obd_device *obd = NULL;
 162         int err = 0, len = 0, serialised = 0;
 163         ENTRY;
 164
 165         if (current->fsuid != 0)
 166                 RETURN(err = -EACCES);
 167
 168         if ((cmd & 0xffffff00) == ((int)'T') << 8) /* ignore all tty ioctls */
 169                 RETURN(err = -ENOTTY);
 170
 171         /* only for debugging */
 172         if (cmd == PTL_IOC_DEBUG_MASK) {
 173                 debug_data = (struct portals_debug_ioctl_data*)arg;
 174                 portal_subsystem_debug = debug_data->subs;
 175                 portal_debug = debug_data->debug;
 176                 return 0;
 177         }
 178
 179         switch (cmd) {
 180         case OBD_IOC_BRW_WRITE:
 181         case OBD_IOC_BRW_READ:
 182         case OBD_IOC_GETATTR:
 183         case ECHO_IOC_ENQUEUE:
 184         case ECHO_IOC_CANCEL:
 185         case OBD_IOC_CLIENT_RECOVER:
 186         case OBD_IOC_CATLOGLIST:
 187         case OBD_IOC_LLOG_INFO:
 188         case OBD_IOC_LLOG_PRINT:
 189         case OBD_IOC_LLOG_CANCEL:
 190         case OBD_IOC_LLOG_CHECK:
 191         case OBD_IOC_LLOG_REMOVE:
 192                 break;
 193         default:
 194                 down(&obd_conf_sem);
 195                 serialised = 1;
 196                 break;
 197         }
 198
 199         CDEBUG(D_IOCTL, "cmd = %x, obd = %p\n", cmd, obd);
 200         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 201                 CERROR("OBD ioctl: data error\n");
 202                 GOTO(out, err = -EINVAL);
 203         }
 204         data = (struct obd_ioctl_data *)buf;
 205
 206         switch (cmd) {
 207         case OBD_IOC_PROCESS_CFG: {
 208                 char *buf;
 209                 struct lustre_cfg *lcfg;
 210
 211                 if (!data->ioc_plen1 || !data->ioc_pbuf1) {
 212                         CERROR("No config buffer passed!\n");
 213                         GOTO(out, err = -EINVAL);
 214                 }
 215                 err = lustre_cfg_getdata(&buf, data->ioc_plen1,
 216                                          data->ioc_pbuf1, 0);
 217                 if (err)
 218                         GOTO(out, err);
 219                 lcfg = (struct lustre_cfg* ) buf;
 220
 221                 err = class_process_config(lcfg);
 222                 lustre_cfg_freedata(buf, data->ioc_plen1);
 223                 GOTO(out, err);
 224         }
 225
 226         case OBD_GET_VERSION:
 227                 if (!data->ioc_inlbuf1) {
 228                         CERROR("No buffer passed in ioctl\n");
 229                         GOTO(out, err = -EINVAL);
 230                 }
 231
 232                 if (strlen(BUILD_VERSION) + 1 > data->ioc_inllen1) {
 233                         CERROR("ioctl buffer too small to hold version\n");
 234                         GOTO(out, err = -EINVAL);
 235                 }
 236
 237                 memcpy(data->ioc_bulk, BUILD_VERSION,
 238                        strlen(BUILD_VERSION) + 1);
 239
 240                 err = copy_to_user((void *)arg, data, len);
 241                 if (err)
 242                         err = -EFAULT;
 243                 GOTO(out, err);
 244
 245         case OBD_IOC_NAME2DEV: {
 246                 /* Resolve a device name.  This does not change the
 247                  * currently selected device.
 248                  */
 249                 int dev;
 250
 251                 dev = class_resolve_dev_name(data->ioc_inllen1,
 252                                              data->ioc_inlbuf1);
 253                 data->ioc_dev = dev;
 254                 if (dev < 0)
 255                         GOTO(out, err = -EINVAL);
 256
 257                 err = copy_to_user((void *)arg, data, sizeof(*data));
 258                 if (err)
 259                         err = -EFAULT;
 260                 GOTO(out, err);
 261         }
 262
 263         case OBD_IOC_UUID2DEV: {
 264                 /* Resolve a device uuid.  This does not change the
 265                  * currently selected device.
 266                  */
 267                 int dev;
 268                 struct obd_uuid uuid;
 269
 270                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 271                         CERROR("No UUID passed!\n");
 272                         GOTO(out, err = -EINVAL);
 273                 }
 274                 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
 275                         CERROR("UUID not NUL terminated!\n");
 276                         GOTO(out, err = -EINVAL);
 277                 }
 278
 279                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 280                 obd_str2uuid(&uuid, data->ioc_inlbuf1);
 281                 dev = class_uuid2dev(&uuid);
 282                 data->ioc_dev = dev;
 283                 if (dev == -1) {
 284                         CDEBUG(D_IOCTL, "No device for UUID %s!\n",
 285                                data->ioc_inlbuf1);
 286                         GOTO(out, err = -EINVAL);
 287                 }
 288
 289                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 290                        dev);
 291                 err = copy_to_user((void *)arg, data, sizeof(*data));
 292                 if (err)
 293                         err = -EFAULT;
 294                 GOTO(out, err);
 295         }
 296
 297
 298         case OBD_IOC_CLOSE_UUID: {
 299                 ptl_nid_t       peer_nid;
 300                 __u32           peer_nal;
 301                 CDEBUG(D_IOCTL, "closing all connections to uuid %s\n",
 302                        data->ioc_inlbuf1);
 303                 lustre_uuid_to_peer(data->ioc_inlbuf1, &peer_nal, &peer_nid);
 304                 GOTO(out, err = 0);
 305         }
 306
 307         }
 308
 309         if (data->ioc_dev >= MAX_OBD_DEVICES) {
 310                 CERROR("OBD ioctl: No device\n");
 311                 GOTO(out, err = -EINVAL);
 312         }
 313         obd = &obd_dev[data->ioc_dev];
 314         if (!(obd && obd->obd_set_up) || obd->obd_stopping) {
 315                 CERROR("OBD ioctl: device not setup %d \n", data->ioc_dev);
 316                 GOTO(out, err = -EINVAL);
 317         }
 318
 319         switch(cmd) {
 320         case OBD_IOC_NO_TRANSNO: {
 321                 if (!obd->obd_attached) {
 322                         CERROR("Device %d not attached\n", obd->obd_minor);
 323                         GOTO(out, err = -ENODEV);
 324                 }
 325                 CDEBUG(D_IOCTL,
 326                        "disabling committed-transno notifications on %d\n",
 327                        obd->obd_minor);
 328                 obd->obd_no_transno = 1;
 329                 GOTO(out, err = 0);
 330         }
 331
 332         default: {
 333                 err = obd_iocontrol(cmd, obd->obd_self_export, len, data, NULL);
 334                 if (err)
 335                         GOTO(out, err);
 336
 337                 err = copy_to_user((void *)arg, data, len);
 338                 if (err)
 339                         err = -EFAULT;
 340                 GOTO(out, err);
 341         }
 342         }
 343
 344  out:
 345         if (buf)
 346                 obd_ioctl_freedata(buf, len);
 347         if (serialised)
 348                 up(&obd_conf_sem);
 349         RETURN(err);
 350 } /* class_handle_ioctl */
 351
 352
 353
 354 #define OBD_MINOR 241
 355 #ifdef __KERNEL__
 356 /* to control /dev/obd */
 357 static int obd_class_ioctl(struct inode *inode, struct file *filp,
 358                            unsigned int cmd, unsigned long arg)
 359 {
 360         return class_handle_ioctl(cmd, arg);
 361 }
 362
 363 /* declare character device */
 364 static struct file_operations obd_psdev_fops = {
 365         ioctl:   obd_class_ioctl,       /* ioctl */
 366         open:    obd_class_open,        /* open */
 367         release: obd_class_release,     /* release */
 368 };
 369
 370 /* modules setup */
 371 static struct miscdevice obd_psdev = {
 372         OBD_MINOR,
 373         "obd_psdev",
 374         &obd_psdev_fops
 375 };
 376 #else
 377 void *obd_psdev = NULL;
 378 #endif
 379
 380 EXPORT_SYMBOL(obd_dev);
 381 EXPORT_SYMBOL(obdo_cachep);
 382 EXPORT_SYMBOL(obd_fail_loc);
 383 EXPORT_SYMBOL(obd_race_waitq);
 384 EXPORT_SYMBOL(obd_timeout);
 385 EXPORT_SYMBOL(obd_lustre_upcall);
 386 EXPORT_SYMBOL(obd_sync_filter);
 387 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
 388 EXPORT_SYMBOL(ptlrpc_abort_inflight_superhack);
 389 EXPORT_SYMBOL(proc_lustre_root);
 390
 391 EXPORT_SYMBOL(class_register_type);
 392 EXPORT_SYMBOL(class_unregister_type);
 393 EXPORT_SYMBOL(class_get_type);
 394 EXPORT_SYMBOL(class_put_type);
 395 EXPORT_SYMBOL(class_name2dev);
 396 EXPORT_SYMBOL(class_name2obd);
 397 EXPORT_SYMBOL(class_uuid2dev);
 398 EXPORT_SYMBOL(class_uuid2obd);
 399 EXPORT_SYMBOL(class_find_client_obd);
 400 EXPORT_SYMBOL(class_devices_in_group);
 401 EXPORT_SYMBOL(__class_export_put);
 402 EXPORT_SYMBOL(class_new_export);
 403 EXPORT_SYMBOL(class_unlink_export);
 404 EXPORT_SYMBOL(class_import_get);
 405 EXPORT_SYMBOL(class_import_put);
 406 EXPORT_SYMBOL(class_new_import);
 407 EXPORT_SYMBOL(class_destroy_import);
 408 EXPORT_SYMBOL(class_connect);
 409 EXPORT_SYMBOL(class_conn2export);
 410 EXPORT_SYMBOL(class_exp2obd);
 411 EXPORT_SYMBOL(class_conn2obd);
 412 EXPORT_SYMBOL(class_exp2cliimp);
 413 EXPORT_SYMBOL(class_conn2cliimp);
 414 EXPORT_SYMBOL(class_disconnect);
 415 EXPORT_SYMBOL(class_disconnect_exports);
 416
 417 EXPORT_SYMBOL(oig_init);
 418 EXPORT_SYMBOL(oig_release);
 419 EXPORT_SYMBOL(oig_add_one);
 420 EXPORT_SYMBOL(oig_wait);
 421 EXPORT_SYMBOL(oig_complete_one);
 422
 423 /* uuid.c */
 424 EXPORT_SYMBOL(class_uuid_unparse);
 425 EXPORT_SYMBOL(lustre_uuid_to_peer);
 426
 427 EXPORT_SYMBOL(class_handle_hash);
 428 EXPORT_SYMBOL(class_handle_unhash);
 429 EXPORT_SYMBOL(class_handle2object);
 430
 431 /* config.c */
 432 EXPORT_SYMBOL(class_get_profile);
 433 EXPORT_SYMBOL(class_del_profile);
 434 EXPORT_SYMBOL(class_process_config);
 435 EXPORT_SYMBOL(class_config_parse_llog);
 436 EXPORT_SYMBOL(class_config_dump_llog);
 437 EXPORT_SYMBOL(class_attach);
 438 EXPORT_SYMBOL(class_setup);
 439 EXPORT_SYMBOL(class_cleanup);
 440 EXPORT_SYMBOL(class_detach);
 441
 442 #ifdef LPROCFS
 443 int obd_proc_read_version(char *page, char **start, off_t off, int count,
 444                           int *eof, void *data)
 445 {
 446         *eof = 1;
 447         return snprintf(page, count, "%s\n", BUILD_VERSION);
 448 }
 449
 450 int obd_proc_read_pinger(char *page, char **start, off_t off, int count,
 451                          int *eof, void *data)
 452 {
 453         *eof = 1;
 454         return snprintf(page, count, "%s\n",
 455 #ifdef ENABLE_PINGER
 456                         "on"
 457 #else
 458                         "off"
 459 #endif
 460                        );
 461 }
 462
 463 /* Root for /proc/fs/lustre */
 464 struct proc_dir_entry *proc_lustre_root = NULL;
 465 struct lprocfs_vars lprocfs_base[] = {
 466         { "version", obd_proc_read_version, NULL, NULL },
 467         { "pinger", obd_proc_read_pinger, NULL, NULL },
 468         { 0 }
 469 };
 470
 471 static void *obd_device_list_seq_start(struct seq_file *p, loff_t*pos)
 472 {
 473         if (*pos >= MAX_OBD_DEVICES)
 474                 return NULL;
 475         return &obd_dev[*pos];
 476 }
 477
 478 static void obd_device_list_seq_stop(struct seq_file *p, void *v)
 479 {
 480 }
 481
 482 static void *obd_device_list_seq_next(struct seq_file *p, void *v, loff_t *pos)
 483 {
 484         ++*pos;
 485         if (*pos >= MAX_OBD_DEVICES)
 486                 return NULL;
 487         return &obd_dev[*pos];
 488 }
 489
 490 static int obd_device_list_seq_show(struct seq_file *p, void *v)
 491 {
 492         struct obd_device *obd = (struct obd_device *)v;
 493         int index = obd - &obd_dev[0];
 494         char *status;
 495
 496         if (!obd->obd_type)
 497                 return 0;
 498         if (obd->obd_stopping)
 499                 status = "ST";
 500         else if (obd->obd_set_up)
 501                 status = "UP";
 502         else if (obd->obd_attached)
 503                 status = "AT";
 504         else
 505                 status = "--";
 506
 507         return seq_printf(p, "%3d %s %s %s %s %d\n",
 508                           (int)index, status, obd->obd_type->typ_name,
 509                           obd->obd_name, obd->obd_uuid.uuid,
 510                           atomic_read(&obd->obd_refcount));
 511 }
 512
 513 struct seq_operations obd_device_list_sops = {
 514         .start = obd_device_list_seq_start,
 515         .stop = obd_device_list_seq_stop,
 516         .next = obd_device_list_seq_next,
 517         .show = obd_device_list_seq_show,
 518 };
 519
 520 static int obd_device_list_open(struct inode *inode, struct file *file)
 521 {
 522         struct proc_dir_entry *dp = PDE(inode);
 523         struct seq_file *seq;
 524         int rc = seq_open(file, &obd_device_list_sops);
 525
 526         if (rc)
 527                 return rc;
 528
 529         seq = file->private_data;
 530         seq->private = dp->data;
 531
 532         return 0;
 533 }
 534
 535 struct file_operations obd_device_list_fops = {
 536         .open = obd_device_list_open,
 537         .read = seq_read,
 538         .llseek = seq_lseek,
 539         .release = seq_release,
 540 };
 541 #endif
 542
 543 #ifdef __KERNEL__
 544 static int __init init_obdclass(void)
 545 #else
 546 int init_obdclass(void)
 547 #endif
 548 {
 549         struct obd_device *obd;
 550 #ifdef LPROCFS
 551         struct proc_dir_entry *entry;
 552 #endif
 553         int err;
 554         int i;
 555
 556         printk(KERN_INFO "Lustre: OBD class driver Build Version: "
 557                BUILD_VERSION", info@clusterfs.com\n");
 558
 559         class_init_uuidlist();
 560         err = class_handle_init();
 561         if (err)
 562                 return err;
 563
 564         sema_init(&obd_conf_sem, 1);
 565         INIT_LIST_HEAD(&obd_types);
 566
 567         err = misc_register(&obd_psdev);
 568         if (err) {
 569                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 570                 return err;
 571         }
 572
 573         /* This struct is already zerod for us (static global) */
 574         for (i = 0, obd = obd_dev; i < MAX_OBD_DEVICES; i++, obd++)
 575                 obd->obd_minor = i;
 576
 577         err = obd_init_caches();
 578         if (err)
 579                 return err;
 580
 581 #ifdef __KERNEL__
 582         obd_sysctl_init();
 583 #endif
 584
 585 #ifdef LPROCFS
 586         proc_lustre_root = proc_mkdir("lustre", proc_root_fs);
 587         if (!proc_lustre_root) {
 588                 printk(KERN_ERR
 589                        "LustreError: error registering /proc/fs/lustre\n");
 590                 RETURN(-ENOMEM);
 591         }
 592         proc_version = lprocfs_add_vars(proc_lustre_root, lprocfs_base, NULL);
 593         entry = create_proc_entry("devices", 0444, proc_lustre_root);
 594         if (entry == NULL) {
 595                 printk(KERN_ERR "LustreError: error registering "
 596                        "/proc/fs/lustre/devices\n");
 597                 lprocfs_remove(proc_lustre_root);
 598                 RETURN(-ENOMEM);
 599         }
 600         entry->proc_fops = &obd_device_list_fops;
 601 #endif
 602         return 0;
 603 }
 604
 605 static void cleanup_obdclass(void)
 606 {
 607         int i;
 608 #ifndef __KERNEL__
 609         int leaked;
 610 #endif
 611         ENTRY;
 612
 613         misc_deregister(&obd_psdev);
 614         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 615                 struct obd_device *obd = &obd_dev[i];
 616                 if (obd->obd_type && obd->obd_set_up &&
 617                     OBT(obd) && OBP(obd, detach)) {
 618                         /* XXX should this call generic detach otherwise? */
 619                         OBP(obd, detach)(obd);
 620                 }
 621         }
 622
 623         obd_cleanup_caches();
 624 #ifdef __KERNEL__
 625         obd_sysctl_clean();
 626 #endif
 627 #ifdef LPROCFS
 628         if (proc_lustre_root) {
 629                 lprocfs_remove(proc_lustre_root);
 630                 proc_lustre_root = NULL;
 631         }
 632 #endif
 633
 634         class_handle_cleanup();
 635         class_exit_uuidlist();
 636
 637 #ifndef __KERNEL__
 638         leaked = atomic_read(&obd_memory);
 639         CDEBUG(leaked ? D_ERROR : D_INFO,
 640                "obd mem max: %d leaked: %d\n", obd_memmax, leaked);
 641 #endif
 642
 643         EXIT;
 644 }
 645
 646 /* Check that we're building against the appropriate version of the Lustre
 647  * kernel patch */
 648 #ifdef __KERNEL__
 649 #include <linux/lustre_version.h>
 650 #define LUSTRE_MIN_VERSION 28
 651 #define LUSTRE_MAX_VERSION 34
 652 #if (LUSTRE_KERNEL_VERSION < LUSTRE_MIN_VERSION)
 653 # error Cannot continue: Your Lustre kernel patch is older than the sources
 654 #elif (LUSTRE_KERNEL_VERSION > LUSTRE_MAX_VERSION)
 655 # error Cannot continue: Your Lustre sources are older than the kernel patch
 656 #endif
 657  #else
 658 # warning "Lib Lustre - no versioning information"
 659 #endif
 660
 661 #ifdef __KERNEL__
 662 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 663 MODULE_DESCRIPTION("Lustre Class Driver Build Version: " BUILD_VERSION);
 664 MODULE_LICENSE("GPL");
 665
 666 module_init(init_obdclass);
 667 module_exit(cleanup_obdclass);
 668 #endif