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  * Copyright (C) 2001, 2002 Cluster File Systems, Inc.
   5  *
   6  * This code is issued under the GNU General Public License.
   7  * See the file COPYING in this distribution
   8  *
   9  * These are the only exported functions, they provide some generic
  10  * infrastructure for managing object devices
  11  *
  12  * Object Devices Class Driver
  13  */
  14
  15 #define EXPORT_SYMTAB
  16 #include <linux/config.h> /* for CONFIG_PROC_FS */
  17 #include <linux/module.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/major.h>
  21 #include <linux/sched.h>
  22 #include <linux/lp.h>
  23 #include <linux/slab.h>
  24 #include <linux/ioport.h>
  25 #include <linux/fcntl.h>
  26 #include <linux/delay.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/fs.h>
  30 #include <linux/poll.h>
  31 #include <linux/init.h>
  32 #include <linux/list.h>
  33 #include <asm/io.h>
  34 #include <asm/system.h>
  35 #include <asm/poll.h>
  36 #include <asm/uaccess.h>
  37 #include <linux/miscdevice.h>
  38
  39 #define DEBUG_SUBSYSTEM S_CLASS
  40
  41 #include <linux/obd_support.h>
  42 #include <linux/obd_class.h>
  43 #include <linux/lustre_debug.h>
  44 #include <linux/smp_lock.h>
  45
  46 struct semaphore obd_conf_sem;   /* serialize configuration commands */
  47 struct obd_device obd_dev[MAX_OBD_DEVICES];
  48 struct list_head obd_types;
  49 unsigned long obd_memory = 0;
  50
  51 /* The following are visible and mutable through /proc/sys/lustre/. */
  52 unsigned long obd_fail_loc = 0;
  53 unsigned long obd_timeout = 100;
  54 char obd_recovery_upcall[128] = "/usr/lib/lustre/ha_assist";
  55
  56 int  obdclass_highmem = 0;
  57
  58 extern struct obd_type *class_nm_to_type(char *nm);
  59
  60 /*  opening /dev/obd */
  61 static int obd_class_open(struct inode * inode, struct file * file)
  62 {
  63         ENTRY;
  64
  65         file->private_data = NULL;
  66         MOD_INC_USE_COUNT;
  67         RETURN(0);
  68 }
  69
  70 /*  closing /dev/obd */
  71 static int obd_class_release(struct inode * inode, struct file * file)
  72 {
  73         ENTRY;
  74
  75         if (file->private_data)
  76                 file->private_data = NULL;
  77
  78         MOD_DEC_USE_COUNT;
  79         RETURN(0);
  80 }
  81
  82
  83 inline void obd_data2conn(struct lustre_handle *conn, struct obd_ioctl_data *data)
  84 {
  85         conn->addr = data->ioc_addr;
  86         conn->cookie = data->ioc_cookie;
  87 }
  88
  89
  90 inline void obd_conn2data(struct obd_ioctl_data *data, struct lustre_handle *conn)
  91 {
  92         data->ioc_addr = conn->addr;
  93         data->ioc_cookie = conn->cookie;
  94 }
  95
  96
  97 /* to control /dev/obd */
  98 static int obd_class_ioctl (struct inode * inode, struct file * filp,
  99                             unsigned int cmd, unsigned long arg)
 100 {
 101         char *buf = NULL;
 102         int len = 0;
 103         struct obd_ioctl_data *data;
 104         struct obd_device *obd = filp->private_data;
 105
 106         struct lustre_handle conn;
 107         int rw = OBD_BRW_READ;
 108         int err = 0;
 109         int serialised = 0;
 110         ENTRY;
 111
 112         switch (cmd)
 113         {
 114         case OBD_IOC_BRW_WRITE:
 115         case OBD_IOC_BRW_READ:
 116         case OBD_IOC_GETATTR:
 117                 break;
 118         default:
 119                 down(&obd_conf_sem);
 120                 serialised = 1;
 121                 break;
 122         }
 123
 124         if (!obd && cmd != OBD_IOC_DEVICE && cmd != TCGETS &&
 125             cmd != OBD_IOC_LIST &&
 126             cmd != OBD_IOC_NAME2DEV && cmd != OBD_IOC_NEWDEV) {
 127                 CERROR("OBD ioctl: No device\n");
 128                 GOTO(out, err=-EINVAL);
 129         }
 130         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 131                 CERROR("OBD ioctl: data error\n");
 132                 GOTO(out, err=-EINVAL);
 133         }
 134         data = (struct obd_ioctl_data *)buf;
 135
 136         switch (cmd) {
 137         case TCGETS:
 138                 GOTO(out, err=-EINVAL);
 139         case OBD_IOC_DEVICE: {
 140                 CDEBUG(D_IOCTL, "\n");
 141                 if (data->ioc_dev >= MAX_OBD_DEVICES || data->ioc_dev < 0) {
 142                         CERROR("OBD ioctl: DEVICE insufficient devices\n");
 143                         GOTO(out, err=-EINVAL);
 144                 }
 145                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 146
 147                 filp->private_data = &obd_dev[data->ioc_dev];
 148                 GOTO(out, err=0);
 149         }
 150
 151         case OBD_IOC_LIST: {
 152                 int i;
 153                 char *buf2 = data->ioc_bulk;
 154                 int remains = data->ioc_inllen1;
 155
 156                 if (!data->ioc_inlbuf1) {
 157                         CERROR("No buffer passed!\n");
 158                         GOTO(out, err=-EINVAL);
 159                 }
 160
 161
 162                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 163                         int l;
 164                         char *status;
 165                         struct obd_device *obd = &obd_dev[i];
 166                         if (!obd->obd_type)
 167                                 continue;
 168                         if (obd->obd_flags & OBD_SET_UP)
 169                                 status = "*";
 170                         else
 171                                 status = " ";
 172                         l = snprintf(buf2, remains, "%2d %s %s %s %s\n",
 173                                      i, status, obd->obd_type->typ_name,
 174                                      obd->obd_name, obd->obd_uuid);
 175                         buf2 +=l;
 176                         remains -=l;
 177                         if (remains <= 0) {
 178                                 CERROR("not enough space for device listing\n");
 179                                 break;
 180                         }
 181                 }
 182
 183                 err = copy_to_user((int *)arg, data, len);
 184                 GOTO(out, err);
 185         }
 186
 187
 188         case OBD_IOC_NAME2DEV: {
 189                 /* Resolve a device name.  This does not change the
 190                  * currently selected device.
 191                  */
 192                 int dev;
 193
 194                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1 ) {
 195                         CERROR("No name passed,!\n");
 196                         GOTO(out, err=-EINVAL);
 197                 }
 198                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 199                         CERROR("Name not nul terminated!\n");
 200                         GOTO(out, err=-EINVAL);
 201                 }
 202
 203                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 204                 dev = class_name2dev(data->ioc_inlbuf1);
 205                 data->ioc_dev = dev;
 206                 if (dev == -1) {
 207                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 208                                data->ioc_inlbuf1);
 209                         GOTO(out, err=-EINVAL);
 210                 }
 211
 212                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 213                        dev);
 214                 err = copy_to_user((int *)arg, data, sizeof(*data));
 215                 GOTO(out, err);
 216         }
 217
 218         case OBD_IOC_UUID2DEV: {
 219                 /* Resolve a device uuid.  This does not change the
 220                  * currently selected device.
 221                  */
 222                 int dev;
 223
 224                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 225                         CERROR("No UUID passed!\n");
 226                         GOTO(out, err=-EINVAL);
 227                 }
 228                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 229                         CERROR("Name not nul terminated!\n");
 230                         GOTO(out, err=-EINVAL);
 231                 }
 232
 233                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 234                 dev = class_uuid2dev(data->ioc_inlbuf1);
 235                 data->ioc_dev = dev;
 236                 if (dev == -1) {
 237                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 238                                data->ioc_inlbuf1);
 239                         GOTO(out, err=-EINVAL);
 240                 }
 241
 242                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 243                        dev);
 244                 err = copy_to_user((int *)arg, data, sizeof(*data));
 245                 GOTO(out, err);
 246         }
 247
 248         case OBD_IOC_NEWDEV: {
 249                 int dev = -1;
 250                 int i;
 251
 252                 filp->private_data = NULL;
 253                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 254                         struct obd_device *obd = &obd_dev[i];
 255                         if (!obd->obd_type) {
 256                                 filp->private_data = obd;
 257                                 dev = i;
 258                                 break;
 259                         }
 260                 }
 261
 262
 263                 data->ioc_dev = dev;
 264                 if (dev == -1)
 265                         GOTO(out, err=-EINVAL);
 266
 267                 err = copy_to_user((int *)arg, data, sizeof(*data));
 268                 GOTO(out, err);
 269         }
 270
 271         case OBD_IOC_ATTACH: {
 272                 struct obd_type *type;
 273
 274                 /* have we attached a type to this device */
 275                 if (obd->obd_flags & OBD_ATTACHED) {
 276                         CERROR("OBD: Device %d already typed as %s.\n",
 277                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 278                         GOTO(out, err=-EBUSY);
 279                 }
 280
 281                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 282                         CERROR("No type passed!\n");
 283                         GOTO(out, err=-EINVAL);
 284                 }
 285                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 286                         CERROR("Type not nul terminated!\n");
 287                         GOTO(out, err=-EINVAL);
 288                 }
 289
 290                 CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 291                        MKSTR(data->ioc_inlbuf1),
 292                        MKSTR(data->ioc_inlbuf2), MKSTR(data->ioc_inlbuf3));
 293
 294                 /* find the type */
 295                 type = class_nm_to_type(data->ioc_inlbuf1);
 296                 if (!type) {
 297                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 298                         GOTO(out, err=-EINVAL);
 299                 }
 300
 301                 obd->obd_type = type;
 302                 INIT_LIST_HEAD(&obd->obd_exports);
 303
 304                 /* do the attach */
 305                 if (OBP(obd, attach))
 306                         err = OBP(obd,attach)(obd, sizeof(*data), data);
 307                 if (err) {
 308                         obd->obd_type = NULL;
 309                 } else {
 310                         obd->obd_flags |= OBD_ATTACHED;
 311                         type->typ_refcnt++;
 312                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 313                                obd->obd_minor, data->ioc_inlbuf1);
 314                         if (data->ioc_inlbuf2) {
 315                                 int len = strlen(data->ioc_inlbuf2) + 1;
 316                                 OBD_ALLOC(obd->obd_name, len);
 317                                 if (!obd->obd_name) {
 318                                         CERROR("no memory\n");
 319                                         LBUG();
 320                                 }
 321                                 memcpy(obd->obd_name, data->ioc_inlbuf2, len);
 322                                 obd->obd_proc_entry =
 323                                         proc_lustre_register_obd_device(obd);
 324                         } else {
 325                                 CERROR("WARNING: unnamed obd device\n");
 326                                 obd->obd_proc_entry = NULL;
 327                         }
 328
 329                         if (data->ioc_inlbuf3) {
 330                                 int len = strlen(data->ioc_inlbuf3);
 331                                 if (len > 37) {
 332                                         CERROR("uuid should be shorter than 37 bytes\n");
 333                                         if (obd->obd_name)
 334                                                 OBD_FREE(obd->obd_name,
 335                                                          strlen(obd->obd_name) + 1);
 336                                         GOTO(out, err=-EINVAL);
 337                                 }
 338                                 memcpy(obd->obd_uuid, data->ioc_inlbuf3,
 339                                        sizeof(obd->obd_uuid));
 340                         }
 341
 342                         MOD_INC_USE_COUNT;
 343                 }
 344
 345                 GOTO(out, err);
 346         }
 347
 348         case OBD_IOC_DETACH: {
 349                 ENTRY;
 350                 if (obd->obd_flags & OBD_SET_UP) {
 351                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 352                         GOTO(out, err=-EBUSY);
 353                 }
 354                 if (! (obd->obd_flags & OBD_ATTACHED) ) {
 355                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 356                         GOTO(out, err=-ENODEV);
 357                 }
 358                 if ( !list_empty(&obd->obd_exports) ) {
 359                         CERROR("OBD device %d has exports\n",
 360                                obd->obd_minor);
 361                         GOTO(out, err=-EBUSY);
 362                 }
 363
 364                 if (obd->obd_name) {
 365                         OBD_FREE(obd->obd_name, strlen(obd->obd_name)+1);
 366                         obd->obd_name = NULL;
 367                 }
 368
 369                 if (obd->obd_proc_entry)
 370                         proc_lustre_release_obd_device(obd);
 371
 372                 obd->obd_flags &= ~OBD_ATTACHED;
 373                 obd->obd_type->typ_refcnt--;
 374                 obd->obd_type = NULL;
 375                 MOD_DEC_USE_COUNT;
 376                 GOTO(out, err=0);
 377         }
 378
 379         case OBD_IOC_SETUP: {
 380                 /* have we attached a type to this device? */
 381                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 382                         CERROR("Device %d not attached\n", obd->obd_minor);
 383                         GOTO(out, err=-ENODEV);
 384                 }
 385
 386                 /* has this been done already? */
 387                 if ( obd->obd_flags & OBD_SET_UP ) {
 388                         CERROR("Device %d already setup (type %s)\n",
 389                                obd->obd_minor, obd->obd_type->typ_name);
 390                         GOTO(out, err=-EBUSY);
 391                 }
 392
 393                 if ( OBT(obd) && OBP(obd, setup) )
 394                         err = obd_setup(obd, sizeof(*data), data);
 395
 396                 if (!err) {
 397                         obd->obd_type->typ_refcnt++;
 398                         obd->obd_flags |= OBD_SET_UP;
 399                 }
 400
 401                 GOTO(out, err);
 402         }
 403         case OBD_IOC_CLEANUP: {
 404                 /* have we attached a type to this device? */
 405                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 406                         CERROR("Device %d not attached\n", obd->obd_minor);
 407                         GOTO(out, err=-ENODEV);
 408                 }
 409
 410                 if ( OBT(obd) && OBP(obd, cleanup) )
 411                         err = obd_cleanup(obd);
 412
 413                 if (!err) {
 414                         obd->obd_flags &= ~OBD_SET_UP;
 415                         obd->obd_type->typ_refcnt--;
 416                 }
 417                 GOTO(out, err);
 418         }
 419
 420         case OBD_IOC_CONNECT: {
 421                 char * cluuid = "OBD_CLASS_UUID";
 422                 obd_data2conn(&conn, data);
 423
 424                 err = obd_connect(&conn, obd, cluuid);
 425
 426                 CDEBUG(D_IOCTL, "assigned export %Lx\n", conn.addr);
 427                 obd_conn2data(data, &conn);
 428                 if (err)
 429                         GOTO(out, err);
 430
 431                 err = copy_to_user((int *)arg, data, sizeof(*data));
 432                 GOTO(out, err);
 433         }
 434
 435         case OBD_IOC_DISCONNECT: {
 436                 obd_data2conn(&conn, data);
 437                 err = obd_disconnect(&conn);
 438                 GOTO(out, err);
 439         }
 440
 441         case OBD_IOC_DEC_USE_COUNT: {
 442                 MOD_DEC_USE_COUNT;
 443                 GOTO(out, err=0);
 444         }
 445
 446         case OBD_IOC_CREATE: {
 447                 struct lov_stripe_md *ea;
 448                 obd_data2conn(&conn, data);
 449
 450
 451                 err = obd_create(&conn, &data->ioc_obdo1, &ea);
 452                 if (err)
 453                         GOTO(out, err);
 454
 455                 err = copy_to_user((int *)arg, data, sizeof(*data));
 456                 GOTO(out, err);
 457         }
 458
 459         case OBD_IOC_GETATTR: {
 460
 461                 obd_data2conn(&conn, data);
 462                 err = obd_getattr(&conn, &data->ioc_obdo1, NULL);
 463                 if (err)
 464                         GOTO(out, err);
 465
 466                 err = copy_to_user((int *)arg, data, sizeof(*data));
 467                 GOTO(out, err);
 468         }
 469
 470         case OBD_IOC_SETATTR: {
 471                 obd_data2conn(&conn, data);
 472                 err = obd_setattr(&conn, &data->ioc_obdo1, NULL);
 473                 if (err)
 474                         GOTO(out, err);
 475
 476                 err = copy_to_user((int *)arg, data, sizeof(*data));
 477                 GOTO(out, err);
 478         }
 479
 480         case OBD_IOC_DESTROY: {
 481                 //void *ea;
 482                 obd_data2conn(&conn, data);
 483
 484                 err = obd_destroy(&conn, &data->ioc_obdo1, NULL);
 485                 if (err)
 486                         GOTO(out, err);
 487
 488                 err = copy_to_user((int *)arg, data, sizeof(*data));
 489                 GOTO(out, err);
 490         }
 491
 492         case OBD_IOC_BRW_WRITE:
 493                 rw = OBD_BRW_WRITE;
 494         case OBD_IOC_BRW_READ: {
 495                 struct lov_stripe_md smd;
 496                 struct io_cb_data *cbd = ll_init_cb();
 497                 obd_count       pages = 0;
 498                 struct brw_page *pga, *pgp;
 499                 int             j;
 500                 unsigned long off;
 501                 __u64 id;
 502
 503                 if (!cbd)
 504                         GOTO(out, err = -ENOMEM);
 505
 506                 obd_data2conn(&conn, data);
 507
 508                 pages = data->ioc_count / PAGE_SIZE;
 509
 510                 CDEBUG(D_INODE, "BRW %s with %d pages\n",
 511                        rw == OBD_BRW_READ ? "read" : "write", pages);
 512                 OBD_ALLOC(pga, pages * sizeof(*pga));
 513                 if (!pga) {
 514                         CERROR("no memory for %d BRW per-page data\n", pages);
 515                         GOTO(brw_free, err = -ENOMEM);
 516                 }
 517
 518                 memset(&smd, 0, sizeof(smd));
 519                 id = smd.lmd_object_id = data->ioc_obdo1.o_id;
 520
 521                 off = data->ioc_offset;
 522
 523                 for (j = 0, pgp = pga; j < pages; j++, off += PAGE_SIZE, pgp++){
 524                         pgp->pg = alloc_pages(obdclass_highmem ? GFP_HIGHUSER : GFP_KERNEL, 0);
 525                         if (!pgp->pg) {
 526                                 CERROR("no memory for brw pages\n");
 527                                 GOTO(brw_cleanup, err = -ENOMEM);
 528                         }
 529                         pgp->count = PAGE_SIZE;
 530                         pgp->off = off;
 531                         pgp->flag = 0;
 532
 533                         if (rw == OBD_BRW_WRITE) {
 534                                 page_debug_setup(kmap(pgp->pg), pgp->count,
 535                                                  pgp->off, id);
 536                                 kunmap(pgp->pg);
 537                         }
 538                 }
 539
 540                 err = obd_brw(rw, &conn, &smd, j, pga, ll_sync_io_cb, cbd);
 541                 EXIT;
 542         brw_cleanup:
 543                 for (j = 0, pgp = pga; j < pages; j++, pgp++) {
 544                         if (pgp->pg != NULL) {
 545                                 int err2;
 546                                 void *addr = kmap(pgp->pg);
 547
 548                                 err2 = page_debug_check("test_brw", addr,
 549                                                         PAGE_SIZE, pgp->off,id);
 550                                 kunmap(pgp->pg);
 551                                 __free_pages(pgp->pg, 0);
 552                                 if (!err)
 553                                         err = err2;
 554                         }
 555                 }
 556         brw_free:
 557                 OBD_FREE(pga, pages * sizeof(*pga));
 558                 GOTO(out, err);
 559         }
 560         default:
 561                 obd_data2conn(&conn, data);
 562
 563                 err = obd_iocontrol(cmd, &conn, len, data, NULL);
 564                 if (err)
 565                         GOTO(out, err);
 566
 567                 err = copy_to_user((int *)arg, data, len);
 568                 GOTO(out, err);
 569         }
 570
 571  out:
 572         if (buf)
 573                 OBD_FREE(buf, len);
 574         if (serialised)
 575                 up(&obd_conf_sem);
 576         RETURN(err);
 577 } /* obd_class_ioctl */
 578
 579
 580
 581 /* declare character device */
 582 static struct file_operations obd_psdev_fops = {
 583         ioctl: obd_class_ioctl,       /* ioctl */
 584         open: obd_class_open,        /* open */
 585         release: obd_class_release,     /* release */
 586 };
 587
 588 /* modules setup */
 589 #define OBD_MINOR 241
 590 static struct miscdevice obd_psdev = {
 591         OBD_MINOR,
 592         "obd_psdev",
 593         &obd_psdev_fops
 594 };
 595
 596 void (*class_signal_client_failure)(struct ptlrpc_client *);
 597
 598 EXPORT_SYMBOL(obd_dev);
 599 EXPORT_SYMBOL(obdo_cachep);
 600 EXPORT_SYMBOL(obd_memory);
 601 EXPORT_SYMBOL(obd_fail_loc);
 602 EXPORT_SYMBOL(obd_timeout);
 603 EXPORT_SYMBOL(obd_recovery_upcall);
 604
 605 EXPORT_SYMBOL(class_register_type);
 606 EXPORT_SYMBOL(class_unregister_type);
 607 EXPORT_SYMBOL(class_name2dev);
 608 EXPORT_SYMBOL(class_uuid2dev);
 609 EXPORT_SYMBOL(class_uuid2obd);
 610 EXPORT_SYMBOL(class_new_export);
 611 EXPORT_SYMBOL(class_connect);
 612 EXPORT_SYMBOL(class_conn2export);
 613 EXPORT_SYMBOL(class_rconn2export);
 614 EXPORT_SYMBOL(class_conn2obd);
 615 EXPORT_SYMBOL(class_disconnect);
 616 EXPORT_SYMBOL(class_disconnect_all);
 617 EXPORT_SYMBOL(class_uuid_parse);
 618 EXPORT_SYMBOL(class_uuid_unparse);
 619 //EXPORT_SYMBOL(class_multi_setup);
 620 //EXPORT_SYMBOL(class_multi_cleanup);
 621
 622 EXPORT_SYMBOL(class_signal_client_failure);
 623
 624 static int __init init_obdclass(void)
 625 {
 626         int err;
 627         int i;
 628
 629         printk(KERN_INFO "OBD class driver  v0.9, info@clusterfs.com\n");
 630
 631         sema_init(&obd_conf_sem, 1);
 632         INIT_LIST_HEAD(&obd_types);
 633
 634         if ((err = misc_register(&obd_psdev))) {
 635                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 636                 return err;
 637         }
 638
 639         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 640                 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
 641                 obd_dev[i].obd_minor = i;
 642                 INIT_LIST_HEAD(&obd_dev[i].obd_exports);
 643         }
 644
 645         err = obd_init_caches();
 646         if (err)
 647                 return err;
 648         obd_sysctl_init();
 649         return 0;
 650 }
 651
 652 static void __exit cleanup_obdclass(void)
 653 {
 654         int i;
 655         ENTRY;
 656
 657         misc_deregister(&obd_psdev);
 658         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 659                 struct obd_device *obd = &obd_dev[i];
 660                 if (obd->obd_type && (obd->obd_flags & OBD_SET_UP) &&
 661                     OBT(obd) && OBP(obd, detach)) {
 662                         /* XXX should this call generic detach otherwise? */
 663                         OBP(obd, detach)(obd);
 664                 }
 665         }
 666
 667         obd_cleanup_caches();
 668         obd_sysctl_clean();
 669         CERROR("obd memory leaked: %ld bytes\n", obd_memory);
 670         EXIT;
 671 }
 672
 673 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 674 MODULE_DESCRIPTION("Lustre Class Driver v1.0");
 675 MODULE_LICENSE("GPL");
 676
 677 module_init(init_obdclass);
 678 module_exit(cleanup_obdclass);