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 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 && strncmp(name, obd->obd_name, 37) == 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                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 201                                data->ioc_inlbuf1);
 202                         RETURN(-EINVAL);
 203                 }
 204
 205                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 206                        dev);
 207                 err = copy_to_user((int *)arg, data, sizeof(*data));
 208                 RETURN(err);
 209         }
 210
 211         case OBD_IOC_NEWDEV: {
 212                 int dev = -1;
 213                 int i;
 214
 215                 filp->private_data = NULL;
 216                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 217                         struct obd_device *obd = &obd_dev[i];
 218                         if (!obd->obd_type) {
 219                                 filp->private_data = obd;
 220                                 dev = i;
 221                                 break;
 222                         }
 223                 }
 224
 225
 226                 data->ioc_dev = dev;
 227                 if (dev == -1)
 228                         RETURN(-EINVAL);
 229
 230                 err = copy_to_user((int *)arg, data, sizeof(*data));
 231                 RETURN(err);
 232         }
 233
 234         case OBD_IOC_ATTACH: {
 235                 struct obd_type *type;
 236
 237                 /* have we attached a type to this device */
 238                 if (obd->obd_flags & OBD_ATTACHED) {
 239                         CERROR("OBD: Device %d already typed as %s.\n",
 240                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 241                         RETURN(-EBUSY);
 242                 }
 243
 244                 CDEBUG(D_IOCTL, "attach %s %s\n", MKSTR(data->ioc_inlbuf1),
 245                        MKSTR(data->ioc_inlbuf2));
 246
 247                 /* find the type */
 248                 type = obd_nm_to_type(data->ioc_inlbuf1);
 249                 if (!type) {
 250                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 251                         RETURN(-EINVAL);
 252                 }
 253
 254                 obd->obd_type = type;
 255                 obd->obd_multi_count = 0;
 256                 INIT_LIST_HEAD(&obd->obd_gen_clients);
 257                 INIT_LIST_HEAD(&obd->obd_req_list);
 258
 259                 /* do the attach */
 260                 if (OBT(obd) && OBP(obd, attach))
 261                         err = OBP(obd,attach)(obd, sizeof(*data), data);
 262                 if (err) {
 263                         obd->obd_type = NULL;
 264                 } else {
 265                         obd->obd_flags |= OBD_ATTACHED;
 266                         type->typ_refcnt++;
 267                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 268                                obd->obd_minor, data->ioc_inlbuf1);
 269                         obd->obd_proc_entry =
 270                                 proc_lustre_register_obd_device(obd);
 271                         if (data->ioc_inlbuf2) {
 272                                 int len = strlen(data->ioc_inlbuf2);
 273                                 OBD_ALLOC(obd->obd_name, len + 1);
 274                                 if (!obd->obd_name) {
 275                                         CERROR("no memory\n");
 276                                         LBUG();
 277                                 }
 278                                 memcpy(obd->obd_name, data->ioc_inlbuf2, len+1);
 279                         }
 280
 281                         MOD_INC_USE_COUNT;
 282                 }
 283
 284                 RETURN(err);
 285         }
 286
 287         case OBD_IOC_DETACH: {
 288                 ENTRY;
 289                 if (obd->obd_flags & OBD_SET_UP) {
 290                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 291                         RETURN(-EBUSY);
 292                 }
 293                 if (! (obd->obd_flags & OBD_ATTACHED) ) {
 294                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 295                         RETURN(-ENODEV);
 296                 }
 297                 if ( !list_empty(&obd->obd_gen_clients) ) {
 298                         CERROR("OBD device %d has connected clients\n",
 299                                obd->obd_minor);
 300                         RETURN(-EBUSY);
 301                 }
 302                 if ( !list_empty(&obd->obd_req_list) ) {
 303                         CERROR("OBD device %d has hanging requests\n",
 304                                obd->obd_minor);
 305                         RETURN(-EBUSY);
 306                 }
 307
 308                 if (obd->obd_name) {
 309                         OBD_FREE(obd->obd_name, strlen(obd->obd_name)+ 1);
 310                         obd->obd_name = NULL;
 311                 }
 312
 313                 if (obd->obd_proc_entry)
 314                         proc_lustre_release_obd_device(obd);
 315
 316                 obd->obd_flags &= ~OBD_ATTACHED;
 317                 obd->obd_type->typ_refcnt--;
 318                 obd->obd_type = NULL;
 319                 MOD_DEC_USE_COUNT;
 320                 RETURN(0);
 321         }
 322
 323         case OBD_IOC_SETUP: {
 324                 /* have we attached a type to this device? */
 325                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 326                         CERROR("Device %d not attached\n", obd->obd_minor);
 327                         RETURN(-ENODEV);
 328                 }
 329
 330                 /* has this been done already? */
 331                 if ( obd->obd_flags & OBD_SET_UP ) {
 332                         CERROR("Device %d already setup (type %s)\n",
 333                                obd->obd_minor, obd->obd_type->typ_name);
 334                         RETURN(-EBUSY);
 335                 }
 336
 337                 if ( OBT(obd) && OBP(obd, setup) )
 338                         err = obd_setup(obd, sizeof(*data), data);
 339
 340                 if (!err) {
 341                         obd->obd_type->typ_refcnt++;
 342                         obd->obd_flags |= OBD_SET_UP;
 343                 }
 344
 345                 RETURN(err);
 346         }
 347         case OBD_IOC_CLEANUP: {
 348                 /* have we attached a type to this device? */
 349                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 350                         CERROR("Device %d not attached\n", obd->obd_minor);
 351                         RETURN(-ENODEV);
 352                 }
 353
 354                 if ( OBT(obd) && OBP(obd, cleanup) )
 355                         err = obd_cleanup(obd);
 356
 357                 if (!err) {
 358                         obd->obd_flags &= ~OBD_SET_UP;
 359                         obd->obd_type->typ_refcnt--;
 360                 }
 361                 RETURN(err);
 362         }
 363
 364         case OBD_IOC_CONNECT: {
 365                 conn.oc_id = data->ioc_conn1;
 366                 conn.oc_dev = obd;
 367
 368                 err = obd_connect(&conn);
 369
 370                 CDEBUG(D_IOCTL, "assigned connection %d\n", conn.oc_id);
 371                 data->ioc_conn1 = conn.oc_id;
 372                 if (err)
 373                         RETURN(err);
 374
 375                 err = copy_to_user((int *)arg, data, sizeof(*data));
 376                 RETURN(err);
 377         }
 378
 379         case OBD_IOC_DISCONNECT: {
 380                 conn.oc_id = data->ioc_conn1;
 381                 conn.oc_dev = obd;
 382
 383                 err = obd_disconnect(&conn);
 384                 RETURN(err);
 385         }
 386
 387         case OBD_IOC_DEC_USE_COUNT: {
 388                 MOD_DEC_USE_COUNT;
 389                 RETURN(0);
 390         }
 391
 392         case OBD_IOC_CREATE: {
 393                 conn.oc_id = data->ioc_conn1;
 394                 conn.oc_dev = obd;
 395
 396                 err = obd_create(&conn, &data->ioc_obdo1);
 397                 if (err)
 398                         RETURN(err);
 399
 400                 err = copy_to_user((int *)arg, data, sizeof(*data));
 401                 RETURN(err);
 402         }
 403
 404         case OBD_IOC_GETATTR: {
 405                 conn.oc_id = data->ioc_conn1;
 406                 conn.oc_dev = obd;
 407
 408                 err = obd_getattr(&conn, &data->ioc_obdo1);
 409                 if (err)
 410                         RETURN(err);
 411
 412                 err = copy_to_user((int *)arg, data, sizeof(*data));
 413                 RETURN(err);
 414         }
 415
 416         case OBD_IOC_SETATTR: {
 417                 conn.oc_id = data->ioc_conn1;
 418                 conn.oc_dev = obd;
 419
 420                 err = obd_setattr(&conn, &data->ioc_obdo1);
 421                 if (err)
 422                         RETURN(err);
 423
 424                 err = copy_to_user((int *)arg, data, sizeof(*data));
 425                 RETURN(err);
 426         }
 427
 428         case OBD_IOC_DESTROY: {
 429                 conn.oc_id = data->ioc_conn1;
 430                 conn.oc_dev = obd;
 431
 432                 err = obd_destroy(&conn, &data->ioc_obdo1);
 433                 if (err)
 434                         RETURN(err);
 435
 436                 err = copy_to_user((int *)arg, data, sizeof(*data));
 437                 RETURN(err);
 438         }
 439
 440         case OBD_IOC_BRW_WRITE:
 441                 rw = OBD_BRW_WRITE;
 442         case OBD_IOC_BRW_READ: {
 443                 /* FIXME: use a better ioctl data struct than obd_ioctl_data.
 444                  *        We don't really support multiple-obdo I/Os here,
 445                  *        for example offset and count are not per-obdo.
 446                  */
 447                 struct obd_conn conns[2];
 448                 struct obdo     *obdos[2] = { NULL, NULL };
 449                 obd_count       oa_bufs[2] = { 0, 0 };
 450                 struct page     **bufs = NULL;
 451                 obd_size        *counts = NULL;
 452                 obd_off         *offsets = NULL;
 453                 obd_flag        *flags = NULL;
 454                 int             num = 1;
 455                 int             pages;
 456                 int             i, j;
 457
 458                 pages = oa_bufs[0] = data->ioc_plen1 / PAGE_SIZE;
 459                 if (data->ioc_obdo2.o_id) {
 460                         num = 2;
 461                         oa_bufs[1] = data->ioc_plen2 / PAGE_SIZE;
 462                         pages += oa_bufs[1];
 463                 }
 464
 465                 CDEBUG(D_INODE, "BRW %s with %dx%d pages\n",
 466                        rw == OBD_BRW_READ ? "read" : "write",
 467                        num, oa_bufs[0]);
 468                 OBD_ALLOC(bufs, pages * sizeof(*bufs));
 469                 OBD_ALLOC(counts, pages * sizeof(*counts));
 470                 OBD_ALLOC(offsets, pages * sizeof(*offsets));
 471                 OBD_ALLOC(flags, pages * sizeof(*flags));
 472                 if (!bufs || !counts || !offsets || !flags) {
 473                         CERROR("no memory for %d BRW per-page data\n", pages);
 474                         err = -ENOMEM;
 475                         GOTO(brw_free, err);
 476                 }
 477
 478                 obdos[0] = &data->ioc_obdo1;
 479                 if (num > 1)
 480                         obdos[1] = &data->ioc_obdo2;
 481
 482                 for (i = 0, pages = 0; i < num; i++) {
 483                         unsigned long off;
 484                         void *from;
 485
 486                         conns[i].oc_id = (&data->ioc_conn1)[i];
 487                         conns[i].oc_dev = obd;
 488
 489                         from = (&data->ioc_pbuf1)[i];
 490                         off = data->ioc_offset;
 491
 492                         for (j = 0; j < oa_bufs[i];
 493                              j++, pages++, off += PAGE_SIZE, from += PAGE_SIZE){
 494                                 unsigned long to;
 495
 496                                 to = __get_free_pages(GFP_KERNEL, 0);
 497                                 if (!to) {
 498                                 /*      ||
 499                                     copy_from_user((void *)to,from,PAGE_SIZE))
 500                                         free_pages(to, 0);
 501                                  */
 502                                         CERROR("no memory for brw pages\n");
 503                                         err = -ENOMEM;
 504                                         GOTO(brw_cleanup, err);
 505                                 }
 506                                 bufs[pages] = virt_to_page(to);
 507                                 counts[pages] = PAGE_SIZE;
 508                                 offsets[pages] = off;
 509                                 flags[pages] = 0;
 510                         }
 511                 }
 512
 513                 err = obd_brw(rw, conns, num, obdos, oa_bufs, bufs,
 514                               counts, offsets, flags, NULL);
 515
 516                 EXIT;
 517         brw_cleanup:
 518                 i = pages;
 519                 while (i-- > 0)
 520                         __free_pages(bufs[i], 0);
 521         brw_free:
 522                 OBD_FREE(bufs, pages * sizeof(*bufs));
 523                 OBD_FREE(counts, pages * sizeof(*counts));
 524                 OBD_FREE(offsets, pages * sizeof(*offsets));
 525                 OBD_FREE(flags, pages * sizeof(*flags));
 526                 return err;
 527         }
 528         default: {
 529                 conn.oc_id = data->ioc_conn1;
 530                 conn.oc_dev = obd;
 531
 532                 err = obd_iocontrol(cmd, &conn, sizeof(*data), data, NULL);
 533                 if (err)
 534                         RETURN(err);
 535
 536                 err = copy_to_user((int *)arg, data, sizeof(*data));
 537                 RETURN(err);
 538         }
 539         }
 540 } /* obd_class_ioctl */
 541
 542
 543 /* Driver interface done, utility functions follow */
 544 int obd_register_type(struct obd_ops *ops, char *nm)
 545 {
 546         struct obd_type *type;
 547
 548         ENTRY;
 549
 550         if (obd_init_magic != 0x11223344) {
 551                 CERROR("bad magic for type\n");
 552                 RETURN(-EINVAL);
 553         }
 554
 555         if (obd_nm_to_type(nm)) {
 556                 CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
 557                 RETURN(-EEXIST);
 558         }
 559
 560         OBD_ALLOC(type, sizeof(*type));
 561         if (!type)
 562                 RETURN(-ENOMEM);
 563         INIT_LIST_HEAD(&type->typ_chain);
 564         MOD_INC_USE_COUNT;
 565         list_add(&type->typ_chain, obd_types.next);
 566         type->typ_ops = ops;
 567         type->typ_name = nm;
 568         RETURN(0);
 569 }
 570
 571 int obd_unregister_type(char *nm)
 572 {
 573         struct obd_type *type = obd_nm_to_type(nm);
 574
 575         ENTRY;
 576
 577         if ( !type ) {
 578                 MOD_DEC_USE_COUNT;
 579                 CERROR("unknown obd type\n");
 580                 RETURN(-EINVAL);
 581         }
 582
 583         if ( type->typ_refcnt ) {
 584                 MOD_DEC_USE_COUNT;
 585                 CERROR("type %s has refcount (%d)\n", nm, type->typ_refcnt);
 586                 RETURN(-EBUSY);
 587         }
 588
 589         list_del(&type->typ_chain);
 590         OBD_FREE(type, sizeof(*type));
 591         MOD_DEC_USE_COUNT;
 592         RETURN(0);
 593 } /* obd_unregister_type */
 594
 595 /* declare character device */
 596 static struct file_operations obd_psdev_fops = {
 597         ioctl: obd_class_ioctl,       /* ioctl */
 598         open: obd_class_open,        /* open */
 599         release: obd_class_release,     /* release */
 600 };
 601
 602 /* modules setup */
 603 #define OBD_MINOR 241
 604 static struct miscdevice obd_psdev = {
 605         OBD_MINOR,
 606         "obd_psdev",
 607         &obd_psdev_fops
 608 };
 609
 610 EXPORT_SYMBOL(obd_register_type);
 611 EXPORT_SYMBOL(obd_unregister_type);
 612
 613 EXPORT_SYMBOL(obd_dev);
 614 EXPORT_SYMBOL(obd_class_name2dev);
 615 EXPORT_SYMBOL(gen_connect);
 616 EXPORT_SYMBOL(gen_client);
 617 EXPORT_SYMBOL(gen_cleanup);
 618 EXPORT_SYMBOL(gen_disconnect);
 619 EXPORT_SYMBOL(gen_copy_data);
 620 EXPORT_SYMBOL(obdo_cachep);
 621
 622 /* EXPORT_SYMBOL(gen_multi_attach); */
 623 EXPORT_SYMBOL(gen_multi_setup);
 624 EXPORT_SYMBOL(gen_multi_cleanup);
 625 EXPORT_SYMBOL(obd_memory);
 626 EXPORT_SYMBOL(obd_fail_loc);
 627
 628 static int __init init_obdclass(void)
 629 {
 630         int err;
 631         int i;
 632
 633         printk(KERN_INFO "OBD class driver  v0.9, info@clusterfs.com\n");
 634
 635         INIT_LIST_HEAD(&obd_types);
 636
 637         if ((err = misc_register(&obd_psdev))) {
 638                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 639                 return err;
 640         }
 641
 642         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 643                 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
 644                 obd_dev[i].obd_minor = i;
 645                 INIT_LIST_HEAD(&obd_dev[i].obd_gen_clients);
 646                 INIT_LIST_HEAD(&obd_dev[i].obd_req_list);
 647                 init_waitqueue_head(&obd_dev[i].obd_req_waitq);
 648         }
 649
 650         err = obd_init_obdo_cache();
 651         if (err)
 652                 return err;
 653         obd_sysctl_init();
 654         obd_init_magic = 0x11223344;
 655         return 0;
 656 }
 657
 658 static void __exit cleanup_obdclass(void)
 659 {
 660         int i;
 661         ENTRY;
 662
 663         misc_deregister(&obd_psdev);
 664         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 665                 struct obd_device *obd = &obd_dev[i];
 666                 if (obd->obd_type && (obd->obd_flags & OBD_SET_UP) &&
 667                     OBT(obd) && OBP(obd, detach)) {
 668                         /* XXX should this call generic detach otherwise? */
 669                         OBP(obd, detach)(obd);
 670                 }
 671         }
 672
 673         obd_cleanup_obdo_cache();
 674         obd_sysctl_clean();
 675         CERROR("obd memory leaked: %ld bytes\n", obd_memory);
 676         obd_init_magic = 0;
 677         EXIT;
 678 }
 679
 680 MODULE_AUTHOR("Cluster File Systems, Inc. <braam@clusterfs.com>");
 681 MODULE_DESCRIPTION("Lustre Class Driver v1.0");
 682 MODULE_LICENSE("GPL");
 683
 684 module_init(init_obdclass);
 685 module_exit(cleanup_obdclass);