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 extern struct obd_type *class_nm_to_type(char *nm);
  57
  58 /*  opening /dev/obd */
  59 static int obd_class_open(struct inode * inode, struct file * file)
  60 {
  61         ENTRY;
  62
  63         file->private_data = NULL;
  64         MOD_INC_USE_COUNT;
  65         RETURN(0);
  66 }
  67
  68 /*  closing /dev/obd */
  69 static int obd_class_release(struct inode * inode, struct file * file)
  70 {
  71         ENTRY;
  72
  73         if (file->private_data)
  74                 file->private_data = NULL;
  75
  76         MOD_DEC_USE_COUNT;
  77         RETURN(0);
  78 }
  79
  80
  81 inline void obd_data2conn(struct lustre_handle *conn, struct obd_ioctl_data *data)
  82 {
  83         conn->addr = data->ioc_addr;
  84         conn->cookie = data->ioc_cookie;
  85 }
  86
  87
  88 inline void obd_conn2data(struct obd_ioctl_data *data, struct lustre_handle *conn)
  89 {
  90         data->ioc_addr = conn->addr;
  91         data->ioc_cookie = conn->cookie;
  92 }
  93
  94
  95 /* to control /dev/obd */
  96 static int obd_class_ioctl (struct inode * inode, struct file * filp,
  97                             unsigned int cmd, unsigned long arg)
  98 {
  99         char *buf = NULL;
 100         int len = 0;
 101         struct obd_ioctl_data *data;
 102         struct obd_device *obd = filp->private_data;
 103
 104         struct lustre_handle conn;
 105         int rw = OBD_BRW_READ;
 106         int err = 0;
 107         int serialised = 0;
 108         ENTRY;
 109
 110         switch (cmd)
 111         {
 112         case OBD_IOC_BRW_WRITE:
 113         case OBD_IOC_BRW_READ:
 114         case OBD_IOC_GETATTR:
 115                 break;
 116         default:
 117                 down(&obd_conf_sem);
 118                 serialised = 1;
 119                 break;
 120         }
 121
 122         if (!obd && cmd != OBD_IOC_DEVICE && cmd != TCGETS &&
 123             cmd != OBD_IOC_LIST &&
 124             cmd != OBD_IOC_NAME2DEV && cmd != OBD_IOC_NEWDEV) {
 125                 CERROR("OBD ioctl: No device\n");
 126                 GOTO(out, err=-EINVAL);
 127         }
 128         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 129                 CERROR("OBD ioctl: data error\n");
 130                 GOTO(out, err=-EINVAL);
 131         }
 132         data = (struct obd_ioctl_data *)buf;
 133
 134         switch (cmd) {
 135         case TCGETS:
 136                 GOTO(out, err=-EINVAL);
 137         case OBD_IOC_DEVICE: {
 138                 CDEBUG(D_IOCTL, "\n");
 139                 if (data->ioc_dev >= MAX_OBD_DEVICES || data->ioc_dev < 0) {
 140                         CERROR("OBD ioctl: DEVICE insufficient devices\n");
 141                         GOTO(out, err=-EINVAL);
 142                 }
 143                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 144
 145                 filp->private_data = &obd_dev[data->ioc_dev];
 146                 GOTO(out, err=0);
 147         }
 148
 149         case OBD_IOC_LIST: {
 150                 int i;
 151                 char *buf2 = data->ioc_bulk;
 152                 int remains = data->ioc_inllen1;
 153
 154                 if (!data->ioc_inlbuf1) {
 155                         CERROR("No buffer passed!\n");
 156                         GOTO(out, err=-EINVAL);
 157                 }
 158
 159
 160                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 161                         int l;
 162                         char *status;
 163                         struct obd_device *obd = &obd_dev[i];
 164                         if (!obd->obd_type)
 165                                 continue;
 166                         if (obd->obd_flags & OBD_SET_UP)
 167                                 status = "*";
 168                         else
 169                                 status = " ";
 170                         l = snprintf(buf2, remains, "%2d %s %s %s %s\n",
 171                                      i, status, obd->obd_type->typ_name,
 172                                      obd->obd_name, obd->obd_uuid);
 173                         buf2 +=l;
 174                         remains -=l;
 175                         if (remains <= 0) {
 176                                 CERROR("not enough space for device listing\n");
 177                                 break;
 178                         }
 179                 }
 180
 181                 err = copy_to_user((int *)arg, data, len);
 182                 GOTO(out, err);
 183         }
 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_inllen1 || !data->ioc_inlbuf1 ) {
 193                         CERROR("No name passed,!\n");
 194                         GOTO(out, err=-EINVAL);
 195                 }
 196                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 197                         CERROR("Name not nul terminated!\n");
 198                         GOTO(out, err=-EINVAL);
 199                 }
 200
 201                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 202                 dev = class_name2dev(data->ioc_inlbuf1);
 203                 data->ioc_dev = dev;
 204                 if (dev == -1) {
 205                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 206                                data->ioc_inlbuf1);
 207                         GOTO(out, err=-EINVAL);
 208                 }
 209
 210                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 211                        dev);
 212                 err = copy_to_user((int *)arg, data, sizeof(*data));
 213                 GOTO(out, err);
 214         }
 215
 216         case OBD_IOC_UUID2DEV: {
 217                 /* Resolve a device uuid.  This does not change the
 218                  * currently selected device.
 219                  */
 220                 int dev;
 221
 222                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 223                         CERROR("No UUID passed!\n");
 224                         GOTO(out, err=-EINVAL);
 225                 }
 226                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 227                         CERROR("Name not nul terminated!\n");
 228                         GOTO(out, err=-EINVAL);
 229                 }
 230
 231                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 232                 dev = class_uuid2dev(data->ioc_inlbuf1);
 233                 data->ioc_dev = dev;
 234                 if (dev == -1) {
 235                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 236                                data->ioc_inlbuf1);
 237                         GOTO(out, err=-EINVAL);
 238                 }
 239
 240                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 241                        dev);
 242                 err = copy_to_user((int *)arg, data, sizeof(*data));
 243                 GOTO(out, err);
 244         }
 245
 246         case OBD_IOC_NEWDEV: {
 247                 int dev = -1;
 248                 int i;
 249
 250                 filp->private_data = NULL;
 251                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 252                         struct obd_device *obd = &obd_dev[i];
 253                         if (!obd->obd_type) {
 254                                 filp->private_data = obd;
 255                                 dev = i;
 256                                 break;
 257                         }
 258                 }
 259
 260
 261                 data->ioc_dev = dev;
 262                 if (dev == -1)
 263                         GOTO(out, err=-EINVAL);
 264
 265                 err = copy_to_user((int *)arg, data, sizeof(*data));
 266                 GOTO(out, err);
 267         }
 268
 269         case OBD_IOC_ATTACH: {
 270                 struct obd_type *type;
 271
 272                 /* have we attached a type to this device */
 273                 if (obd->obd_flags & OBD_ATTACHED) {
 274                         CERROR("OBD: Device %d already typed as %s.\n",
 275                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 276                         GOTO(out, err=-EBUSY);
 277                 }
 278
 279                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 280                         CERROR("No type passed!\n");
 281                         GOTO(out, err=-EINVAL);
 282                 }
 283                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 284                         CERROR("Type not nul terminated!\n");
 285                         GOTO(out, err=-EINVAL);
 286                 }
 287
 288                 CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 289                        MKSTR(data->ioc_inlbuf1),
 290                        MKSTR(data->ioc_inlbuf2), MKSTR(data->ioc_inlbuf3));
 291
 292                 /* find the type */
 293                 type = class_nm_to_type(data->ioc_inlbuf1);
 294                 if (!type) {
 295                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 296                         GOTO(out, err=-EINVAL);
 297                 }
 298
 299                 obd->obd_type = type;
 300                 INIT_LIST_HEAD(&obd->obd_exports);
 301
 302                 /* do the attach */
 303                 if (OBP(obd, attach))
 304                         err = OBP(obd,attach)(obd, sizeof(*data), data);
 305                 if (err) {
 306                         obd->obd_type = NULL;
 307                 } else {
 308                         obd->obd_flags |= OBD_ATTACHED;
 309                         type->typ_refcnt++;
 310                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 311                                obd->obd_minor, data->ioc_inlbuf1);
 312                         if (data->ioc_inlbuf2) {
 313                                 int len = strlen(data->ioc_inlbuf2) + 1;
 314                                 OBD_ALLOC(obd->obd_name, len);
 315                                 if (!obd->obd_name) {
 316                                         CERROR("no memory\n");
 317                                         LBUG();
 318                                 }
 319                                 memcpy(obd->obd_name, data->ioc_inlbuf2, len);
 320                                 obd->obd_proc_entry =
 321                                         proc_lustre_register_obd_device(obd);
 322                         } else {
 323                                 CERROR("WARNING: unnamed obd device\n");
 324                                 obd->obd_proc_entry = NULL;
 325                         }
 326
 327                         if (data->ioc_inlbuf3) {
 328                                 int len = strlen(data->ioc_inlbuf3);
 329                                 if (len > 37) {
 330                                         CERROR("uuid should be shorter than 37 bytes\n");
 331                                         if (obd->obd_name)
 332                                                 OBD_FREE(obd->obd_name,
 333                                                          strlen(obd->obd_name) + 1);
 334                                         GOTO(out, err=-EINVAL);
 335                                 }
 336                                 memcpy(obd->obd_uuid, data->ioc_inlbuf3,
 337                                        sizeof(obd->obd_uuid));
 338                         }
 339
 340                         MOD_INC_USE_COUNT;
 341                 }
 342
 343                 GOTO(out, err);
 344         }
 345
 346         case OBD_IOC_DETACH: {
 347                 ENTRY;
 348                 if (obd->obd_flags & OBD_SET_UP) {
 349                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 350                         GOTO(out, err=-EBUSY);
 351                 }
 352                 if (! (obd->obd_flags & OBD_ATTACHED) ) {
 353                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 354                         GOTO(out, err=-ENODEV);
 355                 }
 356                 if ( !list_empty(&obd->obd_exports) ) {
 357                         CERROR("OBD device %d has exports\n",
 358                                obd->obd_minor);
 359                         GOTO(out, err=-EBUSY);
 360                 }
 361
 362                 if (obd->obd_name) {
 363                         OBD_FREE(obd->obd_name, strlen(obd->obd_name)+1);
 364                         obd->obd_name = NULL;
 365                 }
 366
 367                 if (obd->obd_proc_entry)
 368                         proc_lustre_release_obd_device(obd);
 369
 370                 obd->obd_flags &= ~OBD_ATTACHED;
 371                 obd->obd_type->typ_refcnt--;
 372                 obd->obd_type = NULL;
 373                 MOD_DEC_USE_COUNT;
 374                 GOTO(out, err=0);
 375         }
 376
 377         case OBD_IOC_SETUP: {
 378                 /* have we attached a type to this device? */
 379                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 380                         CERROR("Device %d not attached\n", obd->obd_minor);
 381                         GOTO(out, err=-ENODEV);
 382                 }
 383
 384                 /* has this been done already? */
 385                 if ( obd->obd_flags & OBD_SET_UP ) {
 386                         CERROR("Device %d already setup (type %s)\n",
 387                                obd->obd_minor, obd->obd_type->typ_name);
 388                         GOTO(out, err=-EBUSY);
 389                 }
 390
 391                 if ( OBT(obd) && OBP(obd, setup) )
 392                         err = obd_setup(obd, sizeof(*data), data);
 393
 394                 if (!err) {
 395                         obd->obd_type->typ_refcnt++;
 396                         obd->obd_flags |= OBD_SET_UP;
 397                 }
 398
 399                 GOTO(out, err);
 400         }
 401         case OBD_IOC_CLEANUP: {
 402                 /* have we attached a type to this device? */
 403                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 404                         CERROR("Device %d not attached\n", obd->obd_minor);
 405                         GOTO(out, err=-ENODEV);
 406                 }
 407
 408                 if ( OBT(obd) && OBP(obd, cleanup) )
 409                         err = obd_cleanup(obd);
 410
 411                 if (!err) {
 412                         obd->obd_flags &= ~OBD_SET_UP;
 413                         obd->obd_type->typ_refcnt--;
 414                 }
 415                 GOTO(out, err);
 416         }
 417
 418         case OBD_IOC_CONNECT: {
 419                 char * cluuid = "OBD_CLASS_UUID";
 420                 obd_data2conn(&conn, data);
 421
 422                 err = obd_connect(&conn, obd, cluuid);
 423
 424                 CDEBUG(D_IOCTL, "assigned export %Lx\n", conn.addr);
 425                 obd_conn2data(data, &conn);
 426                 if (err)
 427                         GOTO(out, err);
 428
 429                 err = copy_to_user((int *)arg, data, sizeof(*data));
 430                 GOTO(out, err);
 431         }
 432
 433         case OBD_IOC_DISCONNECT: {
 434                 obd_data2conn(&conn, data);
 435                 err = obd_disconnect(&conn);
 436                 GOTO(out, err);
 437         }
 438
 439         case OBD_IOC_DEC_USE_COUNT: {
 440                 MOD_DEC_USE_COUNT;
 441                 GOTO(out, err=0);
 442         }
 443
 444         case OBD_IOC_CREATE: {
 445                 struct lov_stripe_md *ea;
 446                 obd_data2conn(&conn, data);
 447
 448
 449                 err = obd_create(&conn, &data->ioc_obdo1, &ea);
 450                 if (err)
 451                         GOTO(out, err);
 452
 453                 err = copy_to_user((int *)arg, data, sizeof(*data));
 454                 GOTO(out, err);
 455         }
 456
 457         case OBD_IOC_GETATTR: {
 458
 459                 obd_data2conn(&conn, data);
 460                 err = obd_getattr(&conn, &data->ioc_obdo1, NULL);
 461                 if (err)
 462                         GOTO(out, err);
 463
 464                 err = copy_to_user((int *)arg, data, sizeof(*data));
 465                 GOTO(out, err);
 466         }
 467
 468         case OBD_IOC_SETATTR: {
 469                 obd_data2conn(&conn, data);
 470                 err = obd_setattr(&conn, &data->ioc_obdo1, NULL);
 471                 if (err)
 472                         GOTO(out, err);
 473
 474                 err = copy_to_user((int *)arg, data, sizeof(*data));
 475                 GOTO(out, err);
 476         }
 477
 478         case OBD_IOC_DESTROY: {
 479                 //void *ea;
 480                 obd_data2conn(&conn, data);
 481
 482                 err = obd_destroy(&conn, &data->ioc_obdo1, NULL);
 483                 if (err)
 484                         GOTO(out, err);
 485
 486                 err = copy_to_user((int *)arg, data, sizeof(*data));
 487                 GOTO(out, err);
 488         }
 489
 490         case OBD_IOC_BRW_WRITE:
 491                 rw = OBD_BRW_WRITE;
 492         case OBD_IOC_BRW_READ: {
 493                 struct lov_stripe_md smd;
 494                 struct io_cb_data *cbd = ll_init_cb();
 495                 obd_count       pages = 0;
 496                 struct brw_page *pga, *pgp;
 497                 __u64 id = data->ioc_obdo1.o_id;
 498                 int gfp_mask = (id & 1) ? GFP_HIGHUSER : GFP_KERNEL;
 499                 int verify = (id != 0);
 500                 unsigned long off;
 501                 int j;
 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                 smd.lmd_object_id = 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(gfp_mask, 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 (verify) {
 534                                 void *addr = kmap(pgp->pg);
 535
 536                                 if (rw == OBD_BRW_WRITE)
 537                                         page_debug_setup(addr, pgp->count,
 538                                                          pgp->off, id);
 539                                 else
 540                                         page_debug_setup(addr, pgp->count,
 541                                                          0xdeadbeef00c0ffee,
 542                                                          0xdeadbeef00c0ffee);
 543                                 kunmap(pgp->pg);
 544                         }
 545                 }
 546
 547                 err = obd_brw(rw, &conn, &smd, j, pga, ll_sync_io_cb, cbd);
 548                 EXIT;
 549         brw_cleanup:
 550                 for (j = 0, pgp = pga; j < pages; j++, pgp++) {
 551                         if (pgp->pg != NULL) {
 552                                 if (verify) {
 553                                         void *addr = kmap(pgp->pg);
 554                                         int err2;
 555
 556                                         err2 = page_debug_check("test_brw",
 557                                                                 addr,
 558                                                                 PAGE_SIZE,
 559                                                                 pgp->off,id);
 560                                         if (!err)
 561                                                 err = err2;
 562                                         kunmap(pgp->pg);
 563                                 }
 564                                 __free_pages(pgp->pg, 0);
 565                         }
 566                 }
 567         brw_free:
 568                 OBD_FREE(pga, pages * sizeof(*pga));
 569                 GOTO(out, err);
 570         }
 571         default:
 572                 obd_data2conn(&conn, data);
 573
 574                 err = obd_iocontrol(cmd, &conn, len, data, NULL);
 575                 if (err)
 576                         GOTO(out, err);
 577
 578                 err = copy_to_user((int *)arg, data, len);
 579                 GOTO(out, err);
 580         }
 581
 582  out:
 583         if (buf)
 584                 OBD_FREE(buf, len);
 585         if (serialised)
 586                 up(&obd_conf_sem);
 587         RETURN(err);
 588 } /* obd_class_ioctl */
 589
 590
 591
 592 /* declare character device */
 593 static struct file_operations obd_psdev_fops = {
 594         ioctl: obd_class_ioctl,       /* ioctl */
 595         open: obd_class_open,        /* open */
 596         release: obd_class_release,     /* release */
 597 };
 598
 599 /* modules setup */
 600 #define OBD_MINOR 241
 601 static struct miscdevice obd_psdev = {
 602         OBD_MINOR,
 603         "obd_psdev",
 604         &obd_psdev_fops
 605 };
 606
 607 void (*class_signal_connection_failure)(struct ptlrpc_connection *);
 608 int (*mds_destroy_export)(struct obd_export *exp);
 609 int (*ldlm_destroy_export)(struct obd_export *exp);
 610
 611 EXPORT_SYMBOL(obd_dev);
 612 EXPORT_SYMBOL(obdo_cachep);
 613 EXPORT_SYMBOL(obd_memory);
 614 EXPORT_SYMBOL(obd_fail_loc);
 615 EXPORT_SYMBOL(obd_timeout);
 616 EXPORT_SYMBOL(obd_recovery_upcall);
 617
 618 EXPORT_SYMBOL(class_register_type);
 619 EXPORT_SYMBOL(class_unregister_type);
 620 EXPORT_SYMBOL(class_name2dev);
 621 EXPORT_SYMBOL(class_uuid2dev);
 622 EXPORT_SYMBOL(class_uuid2obd);
 623 EXPORT_SYMBOL(class_new_export);
 624 EXPORT_SYMBOL(class_destroy_export);
 625 EXPORT_SYMBOL(class_connect);
 626 EXPORT_SYMBOL(class_conn2export);
 627 EXPORT_SYMBOL(class_rconn2export);
 628 EXPORT_SYMBOL(class_conn2obd);
 629 EXPORT_SYMBOL(class_disconnect);
 630 EXPORT_SYMBOL(class_disconnect_all);
 631 EXPORT_SYMBOL(class_uuid_parse);
 632 EXPORT_SYMBOL(class_uuid_unparse);
 633 //EXPORT_SYMBOL(class_multi_setup);
 634 //EXPORT_SYMBOL(class_multi_cleanup);
 635
 636 EXPORT_SYMBOL(class_signal_connection_failure);
 637 EXPORT_SYMBOL(mds_destroy_export);
 638 EXPORT_SYMBOL(ldlm_destroy_export);
 639
 640 static int __init init_obdclass(void)
 641 {
 642         int err;
 643         int i;
 644
 645         printk(KERN_INFO "OBD class driver  v0.9, info@clusterfs.com\n");
 646
 647         sema_init(&obd_conf_sem, 1);
 648         INIT_LIST_HEAD(&obd_types);
 649
 650         if ((err = misc_register(&obd_psdev))) {
 651                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 652                 return err;
 653         }
 654
 655         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 656                 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
 657                 obd_dev[i].obd_minor = i;
 658                 INIT_LIST_HEAD(&obd_dev[i].obd_exports);
 659         }
 660
 661         err = obd_init_caches();
 662         if (err)
 663                 return err;
 664         obd_sysctl_init();
 665         return 0;
 666 }
 667
 668 static void __exit cleanup_obdclass(void)
 669 {
 670         int i;
 671         ENTRY;
 672
 673         misc_deregister(&obd_psdev);
 674         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 675                 struct obd_device *obd = &obd_dev[i];
 676                 if (obd->obd_type && (obd->obd_flags & OBD_SET_UP) &&
 677                     OBT(obd) && OBP(obd, detach)) {
 678                         /* XXX should this call generic detach otherwise? */
 679                         OBP(obd, detach)(obd);
 680                 }
 681         }
 682
 683         obd_cleanup_caches();
 684         obd_sysctl_clean();
 685         CERROR("obd memory leaked: %ld bytes\n", obd_memory);
 686         EXIT;
 687 }
 688
 689 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 690 MODULE_DESCRIPTION("Lustre Class Driver v1.0");
 691 MODULE_LICENSE("GPL");
 692
 693 module_init(init_obdclass);
 694 module_exit(cleanup_obdclass);