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 #include <linux/lustre_version.h>
  69 #endif
  70 #include <portals/list.h>
  71
  72 #ifndef __KERNEL__
  73 /* liblustre workaround */
  74 atomic_t portal_kmemory = {0};
  75 #endif
  76
  77 struct obd_device obd_dev[MAX_OBD_DEVICES];
  78 struct list_head obd_types;
  79 spinlock_t obd_dev_lock;
  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_dump_on_timeout;
  90 unsigned int obd_timeout = 100;
  91 unsigned int ldlm_timeout = 6;
  92 char obd_lustre_upcall[128] = "DEFAULT"; /* or NONE or /full/path/to/upcall  */
  93 unsigned int obd_sync_filter = 1; /* = 1, sync by default */
  94
  95 DECLARE_WAIT_QUEUE_HEAD(obd_race_waitq);
  96
  97 #ifdef __KERNEL__
  98
  99 unsigned int obd_print_fail_loc(void)
 100 {
 101         CWARN("obd_fail_loc = %x\n", obd_fail_loc);
 102         return obd_fail_loc;
 103 }
 104
 105 /*  opening /dev/obd */
 106 static int obd_class_open(struct inode * inode, struct file * file)
 107 {
 108         ENTRY;
 109
 110         PORTAL_MODULE_USE;
 111         RETURN(0);
 112 }
 113
 114 /*  closing /dev/obd */
 115 static int obd_class_release(struct inode * inode, struct file * file)
 116 {
 117         ENTRY;
 118
 119         PORTAL_MODULE_UNUSE;
 120         RETURN(0);
 121 }
 122 #endif
 123
 124 static inline void obd_data2conn(struct lustre_handle *conn,
 125                                  struct obd_ioctl_data *data)
 126 {
 127         memset(conn, 0, sizeof *conn);
 128         conn->cookie = data->ioc_cookie;
 129 }
 130
 131 static inline void obd_conn2data(struct obd_ioctl_data *data,
 132                                  struct lustre_handle *conn)
 133 {
 134         data->ioc_cookie = conn->cookie;
 135 }
 136
 137 int class_resolve_dev_name(uint32_t len, char *name)
 138 {
 139         int rc;
 140         int dev;
 141
 142         if (!len || !name) {
 143                 CERROR("No name passed,!\n");
 144                 GOTO(out, rc = -EINVAL);
 145         }
 146         if (name[len - 1] != 0) {
 147                 CERROR("Name not nul terminated!\n");
 148                 GOTO(out, rc = -EINVAL);
 149         }
 150
 151         CDEBUG(D_IOCTL, "device name %s\n", name);
 152         dev = class_name2dev(name);
 153         if (dev == -1) {
 154                 CDEBUG(D_IOCTL, "No device for name %s!\n", name);
 155                 GOTO(out, rc = -EINVAL);
 156         }
 157
 158         CDEBUG(D_IOCTL, "device name %s, dev %d\n", name, dev);
 159         rc = dev;
 160
 161 out:
 162         RETURN(rc);
 163 }
 164
 165 int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 166 {
 167         char *buf = NULL;
 168         struct obd_ioctl_data *data;
 169         struct portals_debug_ioctl_data *debug_data;
 170         struct obd_device *obd = NULL;
 171         int err = 0, len = 0;
 172         ENTRY;
 173
 174         if (current->fsuid != 0)
 175                 RETURN(err = -EACCES);
 176
 177         if ((cmd & 0xffffff00) == ((int)'T') << 8) /* ignore all tty ioctls */
 178                 RETURN(err = -ENOTTY);
 179
 180         /* only for debugging */
 181         if (cmd == PTL_IOC_DEBUG_MASK) {
 182                 debug_data = (struct portals_debug_ioctl_data*)arg;
 183                 portal_subsystem_debug = debug_data->subs;
 184                 portal_debug = debug_data->debug;
 185                 return 0;
 186         }
 187
 188         CDEBUG(D_IOCTL, "cmd = %x, obd = %p\n", cmd, obd);
 189         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 190                 CERROR("OBD ioctl: data error\n");
 191                 GOTO(out, err = -EINVAL);
 192         }
 193         data = (struct obd_ioctl_data *)buf;
 194
 195         switch (cmd) {
 196         case OBD_IOC_PROCESS_CFG: {
 197                 char *buf;
 198                 struct lustre_cfg *lcfg;
 199
 200                 if (!data->ioc_plen1 || !data->ioc_pbuf1) {
 201                         CERROR("No config buffer passed!\n");
 202                         GOTO(out, err = -EINVAL);
 203                 }
 204                 err = lustre_cfg_getdata(&buf, data->ioc_plen1,
 205                                          data->ioc_pbuf1, 0);
 206                 if (err)
 207                         GOTO(out, err);
 208                 lcfg = (struct lustre_cfg* ) buf;
 209
 210                 err = class_process_config(lcfg);
 211                 lustre_cfg_freedata(buf, data->ioc_plen1);
 212                 GOTO(out, err);
 213         }
 214
 215         case OBD_GET_VERSION:
 216                 if (!data->ioc_inlbuf1) {
 217                         CERROR("No buffer passed in ioctl\n");
 218                         GOTO(out, err = -EINVAL);
 219                 }
 220
 221                 if (strlen(BUILD_VERSION) + 1 > data->ioc_inllen1) {
 222                         CERROR("ioctl buffer too small to hold version\n");
 223                         GOTO(out, err = -EINVAL);
 224                 }
 225
 226                 memcpy(data->ioc_bulk, BUILD_VERSION,
 227                        strlen(BUILD_VERSION) + 1);
 228
 229                 err = copy_to_user((void *)arg, data, len);
 230                 if (err)
 231                         err = -EFAULT;
 232                 GOTO(out, err);
 233
 234         case OBD_IOC_NAME2DEV: {
 235                 /* Resolve a device name.  This does not change the
 236                  * currently selected device.
 237                  */
 238                 int dev;
 239
 240                 dev = class_resolve_dev_name(data->ioc_inllen1,
 241                                              data->ioc_inlbuf1);
 242                 data->ioc_dev = dev;
 243                 if (dev < 0)
 244                         GOTO(out, err = -EINVAL);
 245
 246                 err = copy_to_user((void *)arg, data, sizeof(*data));
 247                 if (err)
 248                         err = -EFAULT;
 249                 GOTO(out, err);
 250         }
 251
 252         case OBD_IOC_UUID2DEV: {
 253                 /* Resolve a device uuid.  This does not change the
 254                  * currently selected device.
 255                  */
 256                 int dev;
 257                 struct obd_uuid uuid;
 258
 259                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 260                         CERROR("No UUID passed!\n");
 261                         GOTO(out, err = -EINVAL);
 262                 }
 263                 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
 264                         CERROR("UUID not NUL terminated!\n");
 265                         GOTO(out, err = -EINVAL);
 266                 }
 267
 268                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 269                 obd_str2uuid(&uuid, data->ioc_inlbuf1);
 270                 dev = class_uuid2dev(&uuid);
 271                 data->ioc_dev = dev;
 272                 if (dev == -1) {
 273                         CDEBUG(D_IOCTL, "No device for UUID %s!\n",
 274                                data->ioc_inlbuf1);
 275                         GOTO(out, err = -EINVAL);
 276                 }
 277
 278                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 279                        dev);
 280                 err = copy_to_user((void *)arg, data, sizeof(*data));
 281                 if (err)
 282                         err = -EFAULT;
 283                 GOTO(out, err);
 284         }
 285
 286
 287         case OBD_IOC_CLOSE_UUID: {
 288                 ptl_nid_t       peer_nid;
 289                 __u32           peer_nal;
 290                 CDEBUG(D_IOCTL, "closing all connections to uuid %s\n",
 291                        data->ioc_inlbuf1);
 292                 lustre_uuid_to_peer(data->ioc_inlbuf1, &peer_nal, &peer_nid);
 293                 GOTO(out, err = 0);
 294         }
 295
 296         }
 297
 298         if (data->ioc_dev >= MAX_OBD_DEVICES) {
 299                 CERROR("OBD ioctl: No device\n");
 300                 GOTO(out, err = -EINVAL);
 301         }
 302         obd = &obd_dev[data->ioc_dev];
 303         if (!(obd && obd->obd_set_up) || obd->obd_stopping) {
 304                 CERROR("OBD ioctl: device not setup %d \n", data->ioc_dev);
 305                 GOTO(out, err = -EINVAL);
 306         }
 307
 308         switch(cmd) {
 309         case OBD_IOC_NO_TRANSNO: {
 310                 if (!obd->obd_attached) {
 311                         CERROR("Device %d not attached\n", obd->obd_minor);
 312                         GOTO(out, err = -ENODEV);
 313                 }
 314                 CDEBUG(D_IOCTL,
 315                        "disabling committed-transno notifications on %d\n",
 316                        obd->obd_minor);
 317                 obd->obd_no_transno = 1;
 318                 GOTO(out, err = 0);
 319         }
 320
 321         default: {
 322                 err = obd_iocontrol(cmd, obd->obd_self_export, len, data, NULL);
 323                 if (err)
 324                         GOTO(out, err);
 325
 326                 err = copy_to_user((void *)arg, data, len);
 327                 if (err)
 328                         err = -EFAULT;
 329                 GOTO(out, err);
 330         }
 331         }
 332
 333  out:
 334         if (buf)
 335                 obd_ioctl_freedata(buf, len);
 336         RETURN(err);
 337 } /* class_handle_ioctl */
 338
 339
 340
 341 #define OBD_MINOR 241
 342 #ifdef __KERNEL__
 343 /* to control /dev/obd */
 344 static int obd_class_ioctl(struct inode *inode, struct file *filp,
 345                            unsigned int cmd, unsigned long arg)
 346 {
 347         return class_handle_ioctl(cmd, arg);
 348 }
 349
 350 /* declare character device */
 351 static struct file_operations obd_psdev_fops = {
 352         .owner   = THIS_MODULE,
 353         .ioctl   = obd_class_ioctl,     /* ioctl */
 354         .open    = obd_class_open,      /* open */
 355         .release = obd_class_release,   /* release */
 356 };
 357
 358 /* modules setup */
 359 static struct miscdevice obd_psdev = {
 360         .minor = OBD_MINOR,
 361         .name  = "obd_psdev",
 362         .fops  = &obd_psdev_fops,
 363 };
 364 #else
 365 void *obd_psdev = NULL;
 366 #endif
 367
 368 EXPORT_SYMBOL(obd_dev);
 369 EXPORT_SYMBOL(obdo_cachep);
 370 EXPORT_SYMBOL(obd_fail_loc);
 371 EXPORT_SYMBOL(obd_print_fail_loc);
 372 EXPORT_SYMBOL(obd_race_waitq);
 373 EXPORT_SYMBOL(obd_dump_on_timeout);
 374 EXPORT_SYMBOL(ldlm_timeout);
 375 EXPORT_SYMBOL(obd_timeout);
 376 EXPORT_SYMBOL(obd_lustre_upcall);
 377 EXPORT_SYMBOL(obd_sync_filter);
 378 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
 379 EXPORT_SYMBOL(ptlrpc_abort_inflight_superhack);
 380 EXPORT_SYMBOL(proc_lustre_root);
 381
 382 EXPORT_SYMBOL(class_register_type);
 383 EXPORT_SYMBOL(class_unregister_type);
 384 EXPORT_SYMBOL(class_get_type);
 385 EXPORT_SYMBOL(class_put_type);
 386 EXPORT_SYMBOL(class_name2dev);
 387 EXPORT_SYMBOL(class_name2obd);
 388 EXPORT_SYMBOL(class_uuid2dev);
 389 EXPORT_SYMBOL(class_uuid2obd);
 390 EXPORT_SYMBOL(class_find_client_obd);
 391 EXPORT_SYMBOL(class_devices_in_group);
 392 EXPORT_SYMBOL(__class_export_put);
 393 EXPORT_SYMBOL(class_new_export);
 394 EXPORT_SYMBOL(class_unlink_export);
 395 EXPORT_SYMBOL(class_import_get);
 396 EXPORT_SYMBOL(class_import_put);
 397 EXPORT_SYMBOL(class_new_import);
 398 EXPORT_SYMBOL(class_destroy_import);
 399 EXPORT_SYMBOL(class_connect);
 400 EXPORT_SYMBOL(class_conn2export);
 401 EXPORT_SYMBOL(class_exp2obd);
 402 EXPORT_SYMBOL(class_conn2obd);
 403 EXPORT_SYMBOL(class_exp2cliimp);
 404 EXPORT_SYMBOL(class_conn2cliimp);
 405 EXPORT_SYMBOL(class_disconnect);
 406 EXPORT_SYMBOL(class_disconnect_exports);
 407 EXPORT_SYMBOL(class_disconnect_stale_exports);
 408
 409 EXPORT_SYMBOL(oig_init);
 410 EXPORT_SYMBOL(oig_release);
 411 EXPORT_SYMBOL(oig_add_one);
 412 EXPORT_SYMBOL(oig_wait);
 413 EXPORT_SYMBOL(oig_complete_one);
 414
 415 /* uuid.c */
 416 EXPORT_SYMBOL(class_uuid_unparse);
 417 EXPORT_SYMBOL(lustre_uuid_to_peer);
 418
 419 EXPORT_SYMBOL(class_handle_hash);
 420 EXPORT_SYMBOL(class_handle_unhash);
 421 EXPORT_SYMBOL(class_handle2object);
 422
 423 /* config.c */
 424 EXPORT_SYMBOL(class_get_profile);
 425 EXPORT_SYMBOL(class_del_profile);
 426 EXPORT_SYMBOL(class_process_config);
 427 EXPORT_SYMBOL(class_config_process_llog);
 428 EXPORT_SYMBOL(class_config_dump_llog);
 429
 430 /* mea.c */
 431 EXPORT_SYMBOL(mea_name2idx);
 432 EXPORT_SYMBOL(raw_name2idx);
 433
 434 #ifdef LPROCFS
 435 int obd_proc_read_version(char *page, char **start, off_t off, int count,
 436                           int *eof, void *data)
 437 {
 438         *eof = 1;
 439         return snprintf(page, count, "%s\n", BUILD_VERSION);
 440 }
 441
 442 int obd_proc_read_kernel_version(char *page, char **start, off_t off, int count,
 443                                  int *eof, void *data)
 444 {
 445         *eof = 1;
 446         return snprintf(page, count, "%u\n", LUSTRE_KERNEL_VERSION);
 447 }
 448
 449 int obd_proc_read_pinger(char *page, char **start, off_t off, int count,
 450                          int *eof, void *data)
 451 {
 452         *eof = 1;
 453         return snprintf(page, count, "%s\n",
 454 #ifdef ENABLE_PINGER
 455                         "on"
 456 #else
 457                         "off"
 458 #endif
 459                        );
 460 }
 461
 462 /* Root for /proc/fs/lustre */
 463 struct proc_dir_entry *proc_lustre_root = NULL;
 464 struct lprocfs_vars lprocfs_base[] = {
 465         { "version", obd_proc_read_version, NULL, NULL },
 466         { "kernel_version", obd_proc_read_kernel_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         .owner   = THIS_MODULE,
 537         .open    = obd_device_list_open,
 538         .read    = seq_read,
 539         .llseek  = seq_lseek,
 540         .release = seq_release,
 541 };
 542 #endif
 543
 544 #ifdef __KERNEL__
 545 static int __init init_obdclass(void)
 546 #else
 547 int init_obdclass(void)
 548 #endif
 549 {
 550         struct obd_device *obd;
 551 #ifdef LPROCFS
 552         struct proc_dir_entry *entry;
 553 #endif
 554         int err;
 555         int i;
 556
 557         printk(KERN_INFO "Lustre: OBD class driver Build Version: "
 558                BUILD_VERSION", info@clusterfs.com\n");
 559
 560         class_init_uuidlist();
 561         err = class_handle_init();
 562         if (err)
 563                 return err;
 564
 565         spin_lock_init(&obd_dev_lock);
 566         INIT_LIST_HEAD(&obd_types);
 567
 568         err = misc_register(&obd_psdev);
 569         if (err) {
 570                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 571                 return err;
 572         }
 573
 574         /* This struct is already zerod for us (static global) */
 575         for (i = 0, obd = obd_dev; i < MAX_OBD_DEVICES; i++, obd++)
 576                 obd->obd_minor = i;
 577
 578         err = obd_init_caches();
 579         if (err)
 580                 return err;
 581
 582 #ifdef __KERNEL__
 583         obd_sysctl_init();
 584 #endif
 585
 586 #ifdef LPROCFS
 587         proc_lustre_root = proc_mkdir("lustre", proc_root_fs);
 588         if (!proc_lustre_root) {
 589                 printk(KERN_ERR
 590                        "LustreError: error registering /proc/fs/lustre\n");
 591                 RETURN(-ENOMEM);
 592         }
 593         proc_version = lprocfs_add_vars(proc_lustre_root, lprocfs_base, NULL);
 594         entry = create_proc_entry("devices", 0444, proc_lustre_root);
 595         if (entry == NULL) {
 596                 printk(KERN_ERR "LustreError: error registering "
 597                        "/proc/fs/lustre/devices\n");
 598                 lprocfs_remove(proc_lustre_root);
 599                 RETURN(-ENOMEM);
 600         }
 601         entry->proc_fops = &obd_device_list_fops;
 602 #endif
 603         return 0;
 604 }
 605
 606 /* liblustre doesn't call cleanup_obdclass, apparently.  we carry on in this
 607  * ifdef to the end of the file to cover module and versioning goo.*/
 608 #ifdef __KERNEL__
 609
 610 static void cleanup_obdclass(void)
 611 {
 612         int i;
 613         int leaked;
 614         ENTRY;
 615
 616         misc_deregister(&obd_psdev);
 617         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 618                 struct obd_device *obd = &obd_dev[i];
 619                 if (obd->obd_type && obd->obd_set_up &&
 620                     OBT(obd) && OBP(obd, detach)) {
 621                         /* XXX should this call generic detach otherwise? */
 622                         OBP(obd, detach)(obd);
 623                 }
 624         }
 625
 626         obd_cleanup_caches();
 627         obd_sysctl_clean();
 628 #ifdef LPROCFS
 629         if (proc_lustre_root) {
 630                 lprocfs_remove(proc_lustre_root);
 631                 proc_lustre_root = NULL;
 632         }
 633 #endif
 634
 635         class_handle_cleanup();
 636         class_exit_uuidlist();
 637
 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
 642         EXIT;
 643 }
 644
 645 /* Check that we're building against the appropriate version of the Lustre
 646  * kernel patch */
 647 #include <linux/lustre_version.h>
 648 #define LUSTRE_MIN_VERSION 500
 649 #define LUSTRE_MAX_VERSION 500
 650 #if (LUSTRE_KERNEL_VERSION < LUSTRE_MIN_VERSION)
 651 # error Cannot continue: Your Lustre kernel patch is older than the sources
 652 #elif (LUSTRE_KERNEL_VERSION > LUSTRE_MAX_VERSION)
 653 # error Cannot continue: Your Lustre sources are older than the kernel patch
 654 #endif
 655
 656 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 657 MODULE_DESCRIPTION("Lustre Class Driver Build Version: " BUILD_VERSION);
 658 MODULE_LICENSE("GPL");
 659
 660 module_init(init_obdclass);
 661 module_exit(cleanup_obdclass);
 662 #endif