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  *              An implementation of a loadable kernel mode driver providing
   5  *              multiple kernel/user space bidirectional communications links.
   6  *
   7  *              Author:         Alan Cox <alan@cymru.net>
   8  *
   9  *              This program is free software; you can redistribute it and/or
  10  *              modify it under the terms of the GNU General Public License
  11  *              version 2 as published by the Free Software Foundation.
  12  *
  13  *              Adapted to become the Linux 2.0 Coda pseudo device
  14  *              Peter  Braam  <braam@maths.ox.ac.uk>
  15  *              Michael Callahan <mjc@emmy.smith.edu>
  16  *
  17  *              Changes for Linux 2.1
  18  *              Copyright (c) 1997 Carnegie-Mellon University
  19  *
  20  *              Redone again for Intermezzo
  21  *              Copyright (c) 1998 Peter J. Braam
  22  *
  23  *              Hacked up again for simulated OBD
  24  *              Copyright (c) 1999 Stelias Computing, Inc.
  25  *                (authors {pschwan,braam}@stelias.com)
  26  *              Copyright (C) 1999 Seagate Technology, Inc.
  27  *              Copyright (C) 2001 Cluster File Systems, Inc.
  28  *
  29  *
  30  */
  31
  32 #define EXPORT_SYMTAB
  33 #include <linux/config.h> /* for CONFIG_PROC_FS */
  34 #include <linux/module.h>
  35 #include <linux/errno.h>
  36 #include <linux/kernel.h>
  37 #include <linux/major.h>
  38 #include <linux/kmod.h>   /* for request_module() */
  39 #include <linux/sched.h>
  40 #include <linux/lp.h>
  41 #include <linux/slab.h>
  42 #include <linux/ioport.h>
  43 #include <linux/fcntl.h>
  44 #include <linux/delay.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/proc_fs.h>
  47 #include <linux/fs.h>
  48 #include <linux/poll.h>
  49 #include <linux/init.h>
  50 #include <linux/list.h>
  51 #include <asm/io.h>
  52 #include <asm/system.h>
  53 #include <asm/poll.h>
  54 #include <asm/uaccess.h>
  55 #include <linux/miscdevice.h>
  56
  57 #define DEBUG_SUBSYSTEM S_CLASS
  58
  59 #include <linux/obd_support.h>
  60 #include <linux/obd_class.h>
  61
  62 static int obd_init_magic;
  63 unsigned long obd_memory = 0;
  64 unsigned long obd_fail_loc = 0;
  65 struct obd_device obd_dev[MAX_OBD_DEVICES];
  66 struct list_head obd_types;
  67
  68 /*  opening /dev/obd */
  69 static int obd_class_open(struct inode * inode, struct file * file)
  70 {
  71         ENTRY;
  72
  73         file->private_data = NULL;
  74         MOD_INC_USE_COUNT;
  75         RETURN(0);
  76 }
  77
  78 /*  closing /dev/obd */
  79 static int obd_class_release(struct inode * inode, struct file * file)
  80 {
  81         ENTRY;
  82
  83         if (file->private_data)
  84                 file->private_data = NULL;
  85
  86         MOD_DEC_USE_COUNT;
  87         RETURN(0);
  88 }
  89
  90 static int obd_class_name2dev(char *name)
  91 {
  92         int res = -1;
  93         int i;
  94
  95         for (i=0; i < MAX_OBD_DEVICES; i++) {
  96                 struct obd_device *obd = &obd_dev[i];
  97                 if (obd->obd_name && strcmp(name, obd->obd_name) == 0) {
  98                         res = i;
  99                         return res;
 100                 }
 101         }
 102
 103         return res;
 104 }
 105
 106 /*
 107  * support functions: we could use inter-module communication, but this
 108  * is more portable to other OS's
 109  */
 110 static struct obd_type *obd_search_type(char *nm)
 111 {
 112         struct list_head *tmp;
 113         struct obd_type *type;
 114         CDEBUG(D_INFO, "SEARCH %s\n", nm);
 115
 116         tmp = &obd_types;
 117         while ( (tmp = tmp->next) != &obd_types ) {
 118                 type = list_entry(tmp, struct obd_type, typ_chain);
 119                 CDEBUG(D_INFO, "TYP %s\n", type->typ_name);
 120                 if (strlen(type->typ_name) == strlen(nm) &&
 121                     strcmp(type->typ_name, nm) == 0 ) {
 122                         return type;
 123                 }
 124         }
 125         return NULL;
 126 }
 127
 128 static struct obd_type *obd_nm_to_type(char *nm)
 129 {
 130         struct obd_type *type = obd_search_type(nm);
 131
 132 #ifdef CONFIG_KMOD
 133         if ( !type ) {
 134                 if ( !request_module(nm) ) {
 135                         CDEBUG(D_INFO, "Loaded module '%s'\n", nm);
 136                         type = obd_search_type(nm);
 137                 } else {
 138                         CDEBUG(D_INFO, "Can't load module '%s'\n", nm);
 139                 }
 140         }
 141 #endif
 142         return type;
 143 }
 144
 145 /* to control /dev/obd */
 146 static int obd_class_ioctl (struct inode * inode, struct file * filp,
 147                             unsigned int cmd, unsigned long arg)
 148 {
 149         /* NOTE this must be larger than any of the ioctl data structs */
 150         char buf[1024];
 151         struct obd_ioctl_data *data;
 152         struct obd_device *obd = filp->private_data;
 153         struct obd_conn conn;
 154         int rw = OBD_BRW_READ;
 155         int err = 0;
 156         ENTRY;
 157
 158         memset(buf, 0, sizeof(buf));
 159
 160         if (!obd && cmd != OBD_IOC_DEVICE && cmd != TCGETS
 161             && cmd != OBD_IOC_NAME2DEV && cmd != OBD_IOC_NEWDEV) {
 162                 CERROR("OBD ioctl: No device\n");
 163                 RETURN(-EINVAL);
 164         }
 165         if (obd_ioctl_getdata(buf, buf + 800, (void *)arg)) {
 166                 CERROR("OBD ioctl: data error\n");
 167                 RETURN(-EINVAL);
 168         }
 169         data = (struct obd_ioctl_data *)buf;
 170
 171         switch (cmd) {
 172         case TCGETS:
 173                 RETURN(-EINVAL);
 174         case OBD_IOC_DEVICE: {
 175                 CDEBUG(D_IOCTL, "\n");
 176                 if (data->ioc_dev >= MAX_OBD_DEVICES || data->ioc_dev < 0) {
 177                         CERROR("OBD ioctl: DEVICE insufficient devices\n");
 178                         RETURN(-EINVAL);
 179                 }
 180                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 181
 182                 filp->private_data = &obd_dev[data->ioc_dev];
 183                 RETURN(0);
 184         }
 185
 186         case OBD_IOC_NAME2DEV: {
 187                 /* Resolve a device name.  This does not change the
 188                  * currently selected device.
 189                  */
 190                 int dev;
 191
 192                 if (!data->ioc_inlbuf1) {
 193                         CERROR("No name passed!\n");
 194                         RETURN(-EINVAL);
 195                 }
 196                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 197                 dev = obd_class_name2dev(data->ioc_inlbuf1);
 198                 data->ioc_dev = dev;
 199                 if (dev == -1) {
 200                         CERROR("No device for name %s!\n", data->ioc_inlbuf1);
 201                         RETURN(-EINVAL);
 202                 }
 203
 204                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 205                        dev);
 206                 err = copy_to_user((int *)arg, data, sizeof(*data));
 207                 RETURN(err);
 208         }
 209
 210         case OBD_IOC_NEWDEV: {
 211                 int dev = -1;
 212                 int i;
 213
 214                 filp->private_data = NULL;
 215                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 216                         struct obd_device *obd = &obd_dev[i];
 217                         if (!obd->obd_type) {
 218                                 filp->private_data = obd;
 219                                 dev = i;
 220                                 break;
 221                         }
 222                 }
 223
 224
 225                 data->ioc_dev = dev;
 226                 if (dev == -1)
 227                         RETURN(-EINVAL);
 228
 229                 err = copy_to_user((int *)arg, data, sizeof(*data));
 230                 RETURN(err);
 231         }
 232
 233         case OBD_IOC_ATTACH: {
 234                 struct obd_type *type;
 235
 236                 /* have we attached a type to this device */
 237                 if (obd->obd_flags & OBD_ATTACHED) {
 238                         CERROR("OBD: Device %d already typed as %s.\n",
 239                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 240                         RETURN(-EBUSY);
 241                 }
 242
 243                 CDEBUG(D_IOCTL, "attach %s %s\n", MKSTR(data->ioc_inlbuf1),
 244                        MKSTR(data->ioc_inlbuf2));
 245
 246                 /* find the type */
 247                 type = obd_nm_to_type(data->ioc_inlbuf1);
 248                 if (!type) {
 249                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 250                         RETURN(-EINVAL);
 251                 }
 252
 253                 obd->obd_type = type;
 254                 obd->obd_multi_count = 0;
 255                 INIT_LIST_HEAD(&obd->obd_gen_clients);
 256                 INIT_LIST_HEAD(&obd->obd_req_list);
 257
 258                 /* do the attach */
 259                 if (OBT(obd) && OBP(obd, attach))
 260                         err = OBP(obd,attach)(obd, sizeof(*data), data);
 261                 if (err) {
 262                         obd->obd_type = NULL;
 263                 } else {
 264                         obd->obd_flags |= OBD_ATTACHED;
 265                         type->typ_refcnt++;
 266                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 267                                obd->obd_minor, data->ioc_inlbuf1);
 268                         obd->obd_proc_entry =
 269                                 proc_lustre_register_obd_device(obd);
 270                         if (data->ioc_inlbuf2) {
 271                                 int len = strlen(data->ioc_inlbuf2);
 272                                 OBD_ALLOC(obd->obd_name, len + 1);
 273                                 if (!obd->obd_name) {
 274                                         CERROR("no memory\n");
 275                                         LBUG();
 276                                 }
 277                                 memcpy(obd->obd_name, data->ioc_inlbuf2, len+1);
 278                         }
 279
 280                         MOD_INC_USE_COUNT;
 281                 }
 282
 283                 RETURN(err);
 284         }
 285
 286         case OBD_IOC_DETACH: {
 287                 ENTRY;
 288                 if (obd->obd_flags & OBD_SET_UP) {
 289                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 290                         RETURN(-EBUSY);
 291                 }
 292                 if (! (obd->obd_flags & OBD_ATTACHED) ) {
 293                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 294                         RETURN(-ENODEV);
 295                 }
 296                 if ( !list_empty(&obd->obd_gen_clients) ) {
 297                         CERROR("OBD device %d has connected clients\n",
 298                                obd->obd_minor);
 299                         RETURN(-EBUSY);
 300                 }
 301                 if ( !list_empty(&obd->obd_req_list) ) {
 302                         CERROR("OBD device %d has hanging requests\n",
 303                                obd->obd_minor);
 304                         RETURN(-EBUSY);
 305                 }
 306
 307                 if (obd->obd_name) {
 308                         OBD_FREE(obd->obd_name, strlen(obd->obd_name)+ 1);
 309                         obd->obd_name = NULL;
 310                 }
 311
 312                 if (obd->obd_proc_entry)
 313                         proc_lustre_release_obd_device(obd);
 314
 315                 obd->obd_flags &= ~OBD_ATTACHED;
 316                 obd->obd_type->typ_refcnt--;
 317                 obd->obd_type = NULL;
 318                 MOD_DEC_USE_COUNT;
 319                 RETURN(0);
 320         }
 321
 322         case OBD_IOC_SETUP: {
 323                 /* have we attached a type to this device? */
 324                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 325                         CERROR("Device %d not attached\n", obd->obd_minor);
 326                         RETURN(-ENODEV);
 327                 }
 328
 329                 /* has this been done already? */
 330                 if ( obd->obd_flags & OBD_SET_UP ) {
 331                         CERROR("Device %d already setup (type %s)\n",
 332                                obd->obd_minor, obd->obd_type->typ_name);
 333                         RETURN(-EBUSY);
 334                 }
 335
 336                 if ( OBT(obd) && OBP(obd, setup) )
 337                         err = obd_setup(obd, sizeof(*data), data);
 338
 339                 if (!err) {
 340                         obd->obd_type->typ_refcnt++;
 341                         obd->obd_flags |= OBD_SET_UP;
 342                 }
 343
 344                 RETURN(err);
 345         }
 346         case OBD_IOC_CLEANUP: {
 347                 /* have we attached a type to this device? */
 348                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 349                         CERROR("Device %d not attached\n", obd->obd_minor);
 350                         RETURN(-ENODEV);
 351                 }
 352
 353                 if ( OBT(obd) && OBP(obd, cleanup) )
 354                         err = obd_cleanup(obd);
 355
 356                 if (!err) {
 357                         obd->obd_flags &= ~OBD_SET_UP;
 358                         obd->obd_type->typ_refcnt--;
 359                 }
 360                 RETURN(err);
 361         }
 362
 363         case OBD_IOC_CONNECT: {
 364                 conn.oc_id = data->ioc_conn1;
 365                 conn.oc_dev = obd;
 366
 367                 err = obd_connect(&conn);
 368
 369                 CDEBUG(D_IOCTL, "assigned connection %d\n", conn.oc_id);
 370                 data->ioc_conn1 = conn.oc_id;
 371                 if (err)
 372                         RETURN(err);
 373
 374                 err = copy_to_user((int *)arg, data, sizeof(*data));
 375                 RETURN(err);
 376         }
 377
 378         case OBD_IOC_DISCONNECT: {
 379                 conn.oc_id = data->ioc_conn1;
 380                 conn.oc_dev = obd;
 381
 382                 err = obd_disconnect(&conn);
 383                 RETURN(err);
 384         }
 385
 386         case OBD_IOC_DEC_USE_COUNT: {
 387                 MOD_DEC_USE_COUNT;
 388                 RETURN(0);
 389         }
 390
 391         case OBD_IOC_CREATE: {
 392                 conn.oc_id = data->ioc_conn1;
 393                 conn.oc_dev = obd;
 394
 395                 err = obd_create(&conn, &data->ioc_obdo1);
 396                 if (err)
 397                         RETURN(err);
 398
 399                 err = copy_to_user((int *)arg, data, sizeof(*data));
 400                 RETURN(err);
 401         }
 402
 403         case OBD_IOC_GETATTR: {
 404                 conn.oc_id = data->ioc_conn1;
 405                 conn.oc_dev = obd;
 406
 407                 err = obd_getattr(&conn, &data->ioc_obdo1);
 408                 if (err)
 409                         RETURN(err);
 410
 411                 err = copy_to_user((int *)arg, data, sizeof(*data));
 412                 RETURN(err);
 413         }
 414
 415         case OBD_IOC_SETATTR: {
 416                 conn.oc_id = data->ioc_conn1;
 417                 conn.oc_dev = obd;
 418
 419                 err = obd_setattr(&conn, &data->ioc_obdo1);
 420                 if (err)
 421                         RETURN(err);
 422
 423                 err = copy_to_user((int *)arg, data, sizeof(*data));
 424                 RETURN(err);
 425         }
 426
 427         case OBD_IOC_DESTROY: {
 428                 conn.oc_id = data->ioc_conn1;
 429                 conn.oc_dev = obd;
 430
 431                 err = obd_destroy(&conn, &data->ioc_obdo1);
 432                 if (err)
 433                         RETURN(err);
 434
 435                 err = copy_to_user((int *)arg, data, sizeof(*data));
 436                 RETURN(err);
 437         }
 438
 439         case OBD_IOC_BRW_WRITE:
 440                 rw = OBD_BRW_WRITE;
 441         case OBD_IOC_BRW_READ: {
 442                 /* FIXME: use a better ioctl data struct than obd_ioctl_data.
 443                  *        We don't really support multiple-obdo I/Os here,
 444                  *        for example offset and count are not per-obdo.
 445                  */
 446                 struct obd_conn conns[2];
 447                 struct obdo     *obdos[2] = { NULL, NULL };
 448                 obd_count       oa_bufs[2] = { 0, 0 };
 449                 struct page     **bufs = NULL;
 450                 obd_size        *counts = NULL;
 451                 obd_off         *offsets = NULL;
 452                 obd_flag        *flags = NULL;
 453                 int             num = 1;
 454                 int             pages;
 455                 int             i, j;
 456
 457                 pages = oa_bufs[0] = data->ioc_plen1 / PAGE_SIZE;
 458                 if (data->ioc_obdo2.o_id) {
 459                         num = 2;
 460                         oa_bufs[1] = data->ioc_plen2 / PAGE_SIZE;
 461                         pages += oa_bufs[1];
 462                 }
 463
 464                 CDEBUG(D_INODE, "BRW %s with %dx%d pages\n",
 465                        rw == OBD_BRW_READ ? "read" : "write",
 466                        num, oa_bufs[0]);
 467                 bufs = kmalloc(pages * sizeof(*bufs), GFP_KERNEL);
 468                 counts = kmalloc(pages * sizeof(*counts), GFP_KERNEL);
 469                 offsets = kmalloc(pages * sizeof(*offsets), GFP_KERNEL);
 470                 flags = kmalloc(pages * sizeof(*flags), GFP_KERNEL);
 471                 if (!bufs || !counts || !offsets || !flags) {
 472                         CERROR("no memory for %d BRW per-page data\n", pages);
 473                         err = -ENOMEM;
 474                         GOTO(brw_free, err);
 475                 }
 476
 477                 obdos[0] = &data->ioc_obdo1;
 478                 if (num > 1)
 479                         obdos[1] = &data->ioc_obdo2;
 480
 481                 for (i = 0, pages = 0; i < num; i++) {
 482                         unsigned long off;
 483                         void *from;
 484
 485                         conns[i].oc_id = (&data->ioc_conn1)[i];
 486                         conns[i].oc_dev = obd;
 487
 488                         from = (&data->ioc_pbuf1)[i];
 489                         off = data->ioc_offset;
 490
 491                         for (j = 0; j < oa_bufs[i];
 492                              j++, pages++, off += PAGE_SIZE, from += PAGE_SIZE){
 493                                 unsigned long to;
 494
 495                                 to = __get_free_pages(GFP_KERNEL, 0);
 496                                 if (!to) {
 497                                 /*      ||
 498                                     copy_from_user((void *)to,from,PAGE_SIZE))
 499                                         free_pages(to, 0);
 500                                  */
 501                                         CERROR("no memory for brw pages\n");
 502                                         err = -ENOMEM;
 503                                         GOTO(brw_cleanup, err);
 504                                 }
 505                                 bufs[pages] = virt_to_page(to);
 506                                 counts[pages] = PAGE_SIZE;
 507                                 offsets[pages] = off;
 508                                 flags[pages] = 0;
 509                         }
 510                 }
 511
 512                 err = obd_brw(rw, conns, num, obdos, oa_bufs, bufs,
 513                               counts, offsets, flags);
 514
 515                 EXIT;
 516         brw_cleanup:
 517                 while (pages-- > 0)
 518                         free_pages((unsigned long)page_address(bufs[pages]), 0);
 519         brw_free:
 520                 kfree(flags);
 521                 kfree(offsets);
 522                 kfree(counts);
 523                 kfree(bufs);
 524                 return err;
 525         }
 526         default: {
 527                 conn.oc_id = data->ioc_conn1;
 528                 conn.oc_dev = obd;
 529
 530                 err = obd_iocontrol(cmd, &conn, sizeof(*data), data, NULL);
 531                 if (err)
 532                         RETURN(err);
 533
 534                 err = copy_to_user((int *)arg, data, sizeof(*data));
 535                 RETURN(err);
 536         }
 537         }
 538 } /* obd_class_ioctl */
 539
 540
 541 /* Driver interface done, utility functions follow */
 542 int obd_register_type(struct obd_ops *ops, char *nm)
 543 {
 544         struct obd_type *type;
 545
 546         ENTRY;
 547
 548         if (obd_init_magic != 0x11223344) {
 549                 CERROR("bad magic for type\n");
 550                 RETURN(-EINVAL);
 551         }
 552
 553         if (obd_nm_to_type(nm)) {
 554                 CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
 555                 RETURN(-EEXIST);
 556         }
 557
 558         OBD_ALLOC(type, sizeof(*type));
 559         if (!type)
 560                 RETURN(-ENOMEM);
 561         INIT_LIST_HEAD(&type->typ_chain);
 562         MOD_INC_USE_COUNT;
 563         list_add(&type->typ_chain, obd_types.next);
 564         type->typ_ops = ops;
 565         type->typ_name = nm;
 566         RETURN(0);
 567 }
 568
 569 int obd_unregister_type(char *nm)
 570 {
 571         struct obd_type *type = obd_nm_to_type(nm);
 572
 573         ENTRY;
 574
 575         if ( !type ) {
 576                 MOD_DEC_USE_COUNT;
 577                 CERROR("unknown obd type\n");
 578                 RETURN(-EINVAL);
 579         }
 580
 581         if ( type->typ_refcnt ) {
 582                 MOD_DEC_USE_COUNT;
 583                 CERROR("type %s has refcount (%d)\n", nm, type->typ_refcnt);
 584                 RETURN(-EBUSY);
 585         }
 586
 587         list_del(&type->typ_chain);
 588         OBD_FREE(type, sizeof(*type));
 589         MOD_DEC_USE_COUNT;
 590         RETURN(0);
 591 } /* obd_unregister_type */
 592
 593 /* declare character device */
 594 static struct file_operations obd_psdev_fops = {
 595         ioctl: obd_class_ioctl,       /* ioctl */
 596         open: obd_class_open,        /* open */
 597         release: obd_class_release,     /* release */
 598 };
 599
 600 /* modules setup */
 601 #define OBD_MINOR 241
 602 static struct miscdevice obd_psdev = {
 603         OBD_MINOR,
 604         "obd_psdev",
 605         &obd_psdev_fops
 606 };
 607
 608 EXPORT_SYMBOL(obd_register_type);
 609 EXPORT_SYMBOL(obd_unregister_type);
 610
 611 EXPORT_SYMBOL(obd_dev);
 612
 613 EXPORT_SYMBOL(gen_connect);
 614 EXPORT_SYMBOL(gen_client);
 615 EXPORT_SYMBOL(gen_cleanup);
 616 EXPORT_SYMBOL(gen_disconnect);
 617 EXPORT_SYMBOL(gen_copy_data);
 618 EXPORT_SYMBOL(obdo_cachep);
 619
 620 /* EXPORT_SYMBOL(gen_multi_attach); */
 621 EXPORT_SYMBOL(gen_multi_setup);
 622 EXPORT_SYMBOL(gen_multi_cleanup);
 623 EXPORT_SYMBOL(obd_memory);
 624 EXPORT_SYMBOL(obd_fail_loc);
 625
 626 static int __init init_obdclass(void)
 627 {
 628         int err;
 629         int i;
 630
 631         printk(KERN_INFO "OBD class driver  v0.01, braam@stelias.com\n");
 632
 633         INIT_LIST_HEAD(&obd_types);
 634
 635         if ((err = misc_register(&obd_psdev))) {
 636                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 637                 return err;
 638         }
 639
 640         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 641                 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
 642                 obd_dev[i].obd_minor = i;
 643                 INIT_LIST_HEAD(&obd_dev[i].obd_gen_clients);
 644                 INIT_LIST_HEAD(&obd_dev[i].obd_req_list);
 645                 init_waitqueue_head(&obd_dev[i].obd_req_waitq);
 646         }
 647
 648         err = obd_init_obdo_cache();
 649         if (err)
 650                 return err;
 651         obd_sysctl_init();
 652         obd_init_magic = 0x11223344;
 653         return 0;
 654 }
 655
 656 static void __exit cleanup_obdclass(void)
 657 {
 658         int i;
 659         ENTRY;
 660
 661         misc_deregister(&obd_psdev);
 662         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 663                 struct obd_device *obd = &obd_dev[i];
 664                 if ( obd->obd_type &&
 665                      (obd->obd_flags & OBD_SET_UP) &&
 666                      OBT(obd) && OBP(obd, detach) ) {
 667                         /* XXX should this call generic detach otherwise? */
 668                         OBP(obd, detach)(obd);
 669                 }
 670         }
 671
 672         obd_cleanup_obdo_cache();
 673         obd_sysctl_clean();
 674         CERROR("obd memory leaked: %ld bytes\n", obd_memory);
 675         obd_init_magic = 0;
 676         EXIT;
 677 }
 678
 679 MODULE_AUTHOR("Cluster File Systems, Inc. <braam@clusterfs.com>");
 680 MODULE_DESCRIPTION("Lustre Class Driver v1.0");
 681 MODULE_LICENSE("GPL");
 682
 683 module_init(init_obdclass);
 684 module_exit(cleanup_obdclass);