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 = "UP";
 168                         else if (obd->obd_flags & OBD_ATTACHED)
 169                                 status = "AT";
 170                         else
 171                                 status = "-";
 172                         l = snprintf(buf2, remains, "%2d %s %s %s %s %d\n",
 173                                      i, status, obd->obd_type->typ_name,
 174                                      obd->obd_name, obd->obd_uuid, obd->obd_type->typ_refcnt);
 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                 __u64 id = data->ioc_obdo1.o_id;
 500                 int gfp_mask = (id & 1) ? GFP_HIGHUSER : GFP_KERNEL;
 501                 int verify = (id != 0);
 502                 unsigned long off;
 503                 int j;
 504
 505                 if (!cbd)
 506                         GOTO(out, err = -ENOMEM);
 507
 508                 obd_data2conn(&conn, data);
 509
 510                 pages = data->ioc_count / PAGE_SIZE;
 511
 512                 CDEBUG(D_INODE, "BRW %s with %d pages\n",
 513                        rw == OBD_BRW_READ ? "read" : "write", pages);
 514                 OBD_ALLOC(pga, pages * sizeof(*pga));
 515                 if (!pga) {
 516                         CERROR("no memory for %d BRW per-page data\n", pages);
 517                         GOTO(brw_free, err = -ENOMEM);
 518                 }
 519
 520                 memset(&smd, 0, sizeof(smd));
 521                 smd.lmd_object_id = id;
 522
 523                 off = data->ioc_offset;
 524
 525                 for (j = 0, pgp = pga; j < pages; j++, off += PAGE_SIZE, pgp++){
 526                         pgp->pg = alloc_pages(gfp_mask, 0);
 527                         if (!pgp->pg) {
 528                                 CERROR("no memory for brw pages\n");
 529                                 GOTO(brw_cleanup, err = -ENOMEM);
 530                         }
 531                         pgp->count = PAGE_SIZE;
 532                         pgp->off = off;
 533                         pgp->flag = 0;
 534
 535                         if (verify) {
 536                                 void *addr = kmap(pgp->pg);
 537
 538                                 if (rw == OBD_BRW_WRITE)
 539                                         page_debug_setup(addr, pgp->count,
 540                                                          pgp->off, id);
 541                                 else
 542                                         page_debug_setup(addr, pgp->count,
 543                                                          0xdeadbeef00c0ffee,
 544                                                          0xdeadbeef00c0ffee);
 545                                 kunmap(pgp->pg);
 546                         }
 547                 }
 548
 549                 err = obd_brw(rw, &conn, &smd, j, pga, ll_sync_io_cb, cbd);
 550                 EXIT;
 551         brw_cleanup:
 552                 for (j = 0, pgp = pga; j < pages; j++, pgp++) {
 553                         if (pgp->pg != NULL) {
 554                                 if (verify) {
 555                                         void *addr = kmap(pgp->pg);
 556                                         int err2;
 557
 558                                         err2 = page_debug_check("test_brw",
 559                                                                 addr,
 560                                                                 PAGE_SIZE,
 561                                                                 pgp->off,id);
 562                                         if (!err)
 563                                                 err = err2;
 564                                         kunmap(pgp->pg);
 565                                 }
 566                                 __free_pages(pgp->pg, 0);
 567                         }
 568                 }
 569         brw_free:
 570                 OBD_FREE(pga, pages * sizeof(*pga));
 571                 GOTO(out, err);
 572         }
 573         default:
 574                 obd_data2conn(&conn, data);
 575
 576                 err = obd_iocontrol(cmd, &conn, len, data, NULL);
 577                 if (err)
 578                         GOTO(out, err);
 579
 580                 err = copy_to_user((int *)arg, data, len);
 581                 GOTO(out, err);
 582         }
 583
 584  out:
 585         if (buf)
 586                 OBD_FREE(buf, len);
 587         if (serialised)
 588                 up(&obd_conf_sem);
 589         RETURN(err);
 590 } /* obd_class_ioctl */
 591
 592
 593
 594 /* declare character device */
 595 static struct file_operations obd_psdev_fops = {
 596         ioctl: obd_class_ioctl,       /* ioctl */
 597         open: obd_class_open,        /* open */
 598         release: obd_class_release,     /* release */
 599 };
 600
 601 /* modules setup */
 602 #define OBD_MINOR 241
 603 static struct miscdevice obd_psdev = {
 604         OBD_MINOR,
 605         "obd_psdev",
 606         &obd_psdev_fops
 607 };
 608
 609 void (*class_signal_connection_failure)(struct ptlrpc_connection *);
 610 int (*mds_destroy_export)(struct obd_export *exp);
 611 int (*ldlm_destroy_export)(struct obd_export *exp);
 612
 613 EXPORT_SYMBOL(obd_dev);
 614 EXPORT_SYMBOL(obdo_cachep);
 615 EXPORT_SYMBOL(obd_memory);
 616 EXPORT_SYMBOL(obd_fail_loc);
 617 EXPORT_SYMBOL(obd_timeout);
 618 EXPORT_SYMBOL(obd_recovery_upcall);
 619
 620 EXPORT_SYMBOL(class_register_type);
 621 EXPORT_SYMBOL(class_unregister_type);
 622 EXPORT_SYMBOL(class_name2dev);
 623 EXPORT_SYMBOL(class_uuid2dev);
 624 EXPORT_SYMBOL(class_uuid2obd);
 625 EXPORT_SYMBOL(class_new_export);
 626 EXPORT_SYMBOL(class_destroy_export);
 627 EXPORT_SYMBOL(class_connect);
 628 EXPORT_SYMBOL(class_conn2export);
 629 EXPORT_SYMBOL(class_rconn2export);
 630 EXPORT_SYMBOL(class_conn2obd);
 631 EXPORT_SYMBOL(class_disconnect);
 632 EXPORT_SYMBOL(class_disconnect_all);
 633 EXPORT_SYMBOL(class_uuid_parse);
 634 EXPORT_SYMBOL(class_uuid_unparse);
 635 //EXPORT_SYMBOL(class_multi_setup);
 636 //EXPORT_SYMBOL(class_multi_cleanup);
 637
 638 EXPORT_SYMBOL(class_signal_connection_failure);
 639 EXPORT_SYMBOL(mds_destroy_export);
 640 EXPORT_SYMBOL(ldlm_destroy_export);
 641
 642 static int __init init_obdclass(void)
 643 {
 644         int err;
 645         int i;
 646
 647         printk(KERN_INFO "OBD class driver  v0.9, info@clusterfs.com\n");
 648
 649         sema_init(&obd_conf_sem, 1);
 650         INIT_LIST_HEAD(&obd_types);
 651
 652         if ((err = misc_register(&obd_psdev))) {
 653                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 654                 return err;
 655         }
 656
 657         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 658                 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
 659                 obd_dev[i].obd_minor = i;
 660                 INIT_LIST_HEAD(&obd_dev[i].obd_exports);
 661         }
 662
 663         err = obd_init_caches();
 664         if (err)
 665                 return err;
 666         obd_sysctl_init();
 667         return 0;
 668 }
 669
 670 static void __exit cleanup_obdclass(void)
 671 {
 672         int i;
 673         ENTRY;
 674
 675         misc_deregister(&obd_psdev);
 676         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 677                 struct obd_device *obd = &obd_dev[i];
 678                 if (obd->obd_type && (obd->obd_flags & OBD_SET_UP) &&
 679                     OBT(obd) && OBP(obd, detach)) {
 680                         /* XXX should this call generic detach otherwise? */
 681                         OBP(obd, detach)(obd);
 682                 }
 683         }
 684
 685         obd_cleanup_caches();
 686         obd_sysctl_clean();
 687         CERROR("obd memory leaked: %ld bytes\n", obd_memory);
 688         EXIT;
 689 }
 690
 691 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 692 MODULE_DESCRIPTION("Lustre Class Driver v1.0");
 693 MODULE_LICENSE("GPL");
 694
 695 module_init(init_obdclass);
 696 module_exit(cleanup_obdclass);