lustre/obdclass/class_obd.c

   1 /*
   2  *              An implementation of a loadable kernel mode driver providing
   3  *              multiple kernel/user space bidirectional communications links.
   4  *
   5  *              Author:         Alan Cox <alan@cymru.net>
   6  *
   7  *              This program is free software; you can redistribute it and/or
   8  *              modify it under the terms of the GNU General Public License
   9  *              version 2 as published by the Free Software Foundation.
  10  *
  11  *              Adapted to become the Linux 2.0 Coda pseudo device
  12  *              Peter  Braam  <braam@maths.ox.ac.uk>
  13  *              Michael Callahan <mjc@emmy.smith.edu>
  14  *
  15  *              Changes for Linux 2.1
  16  *              Copyright (c) 1997 Carnegie-Mellon University
  17  *
  18  *              Redone again for Intermezzo
  19  *              Copyright (c) 1998 Peter J. Braam
  20  *
  21  *              Hacked up again for simulated OBD
  22  *              Copyright (c) 1999 Stelias Computing, Inc.
  23  *                (authors {pschwan,braam}@stelias.com)
  24  *              Copyright (C) 1999 Seagate Technology, Inc.
  25  *              Copyright (C) 2001 Cluster File Systems, Inc.
  26  *
  27  *
  28  */
  29
  30 #define EXPORT_SYMTAB
  31 #include <linux/config.h> /* for CONFIG_PROC_FS */
  32 #include <linux/module.h>
  33 #include <linux/errno.h>
  34 #include <linux/kernel.h>
  35 #include <linux/major.h>
  36 #include <linux/kmod.h>   /* for request_module() */
  37 #include <linux/sched.h>
  38 #include <linux/lp.h>
  39 #include <linux/slab.h>
  40 #include <linux/ioport.h>
  41 #include <linux/fcntl.h>
  42 #include <linux/delay.h>
  43 #include <linux/skbuff.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/fs.h>
  46 #include <linux/poll.h>
  47 #include <linux/init.h>
  48 #include <linux/list.h>
  49 #include <asm/io.h>
  50 #include <asm/system.h>
  51 #include <asm/poll.h>
  52 #include <asm/uaccess.h>
  53 #include <linux/miscdevice.h>
  54
  55 #include <linux/obd_support.h>
  56 #include <linux/obd_class.h>
  57
  58 static int obd_init_magic;
  59 int obd_print_entry = 1;
  60 int obd_debug_level = ~0;
  61 long obd_memory = 0;
  62 struct obd_device obd_dev[MAX_OBD_DEVICES];
  63 struct list_head obd_types;
  64
  65 /*  opening /dev/obd */
  66 static int obd_class_open(struct inode * inode, struct file * file)
  67 {
  68         ENTRY;
  69
  70         file->private_data = NULL;
  71         MOD_INC_USE_COUNT;
  72         EXIT;
  73         return 0;
  74 }
  75
  76 /*  closing /dev/obd */
  77 static int obd_class_release(struct inode * inode, struct file * file)
  78 {
  79         ENTRY;
  80
  81         if (file->private_data)
  82                 file->private_data = NULL;
  83
  84         MOD_DEC_USE_COUNT;
  85         EXIT;
  86         return 0;
  87 }
  88
  89 /*
  90  * support functions: we could use inter-module communication, but this
  91  * is more portable to other OS's
  92  */
  93 static struct obd_type *obd_search_type(char *nm)
  94 {
  95         struct list_head *tmp;
  96         struct obd_type *type;
  97         CDEBUG(D_INFO, "SEARCH %s\n", nm);
  98
  99         tmp = &obd_types;
 100         while ( (tmp = tmp->next) != &obd_types ) {
 101                 type = list_entry(tmp, struct obd_type, typ_chain);
 102                 CDEBUG(D_INFO, "TYP %s\n", type->typ_name);
 103                 if (strlen(type->typ_name) == strlen(nm) &&
 104                     strcmp(type->typ_name, nm) == 0 ) {
 105                         return type;
 106                 }
 107         }
 108         return NULL;
 109 }
 110
 111 static struct obd_type *obd_nm_to_type(char *nm)
 112 {
 113         struct obd_type *type = obd_search_type(nm);
 114
 115 #ifdef CONFIG_KMOD
 116         if ( !type ) {
 117                 if ( !request_module(nm) ) {
 118                         CDEBUG(D_PSDEV, "Loaded module '%s'\n", nm);
 119                         type = obd_search_type(nm);
 120                 } else {
 121                         CDEBUG(D_PSDEV, "Can't load module '%s'\n", nm);
 122                 }
 123         }
 124 #endif
 125         return type;
 126 }
 127
 128 /* to control /dev/obd */
 129 static int obd_class_ioctl (struct inode * inode, struct file * filp,
 130                             unsigned int cmd, unsigned long arg)
 131 {
 132         /* NOTE this must be larger than any of the ioctl data structs */
 133         char buf[1024];
 134         struct obd_ioctl_data *data;
 135         struct obd_device *obd = filp->private_data;
 136         struct obd_conn conn;
 137         int err = 0;
 138         ENTRY;
 139
 140         memset(buf, 0, sizeof(buf));
 141
 142         if (!obd && cmd != OBD_IOC_DEVICE && cmd != TCGETS) {
 143                 printk("OBD ioctl: No device\n");
 144                 return -EINVAL;
 145         }
 146         if (obd_ioctl_getdata(buf, buf + 800, (void *)arg)) {
 147                 printk("OBD ioctl: data error\n");
 148                 return -EINVAL;
 149         }
 150         data = (struct obd_ioctl_data *)buf;
 151
 152         switch (cmd) {
 153         case TCGETS: {
 154                 EXIT;
 155                 return -EINVAL;
 156         }
 157         case OBD_IOC_DEVICE: {
 158                 CDEBUG(D_IOCTL, "\n");
 159                 if (data->ioc_dev >= MAX_OBD_DEVICES ||
 160                     data->ioc_dev < 0) {
 161                         printk("OBD ioctl: DEVICE insufficient devices\n");
 162                         return -EINVAL;
 163                 }
 164                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 165
 166                 filp->private_data = &obd_dev[data->ioc_dev];
 167                 EXIT;
 168                 return 0;
 169         }
 170
 171         case OBD_IOC_ATTACH: {
 172                 struct obd_type *type;
 173
 174                 ENTRY;
 175                 /* have we attached a type to this device */
 176                 if ( obd->obd_flags & OBD_ATTACHED ) {
 177                         printk("OBD: Device %d already typed as  %s.\n",
 178                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 179                         return -EBUSY;
 180                 }
 181
 182                 printk("-----> attach %s %s\n",  MKSTR(data->ioc_inlbuf1),
 183                        MKSTR(data->ioc_inlbuf2));
 184
 185                 /* find the type */
 186                 type = obd_nm_to_type(data->ioc_inlbuf1);
 187                 if ( !type ) {
 188                         printk("OBD: unknown type dev %d\n", obd->obd_minor);
 189                         return -EINVAL;
 190                 }
 191
 192                 obd->obd_type = type;
 193                 obd->obd_multi_count = 0;
 194                 INIT_LIST_HEAD(&obd->obd_gen_clients);
 195
 196                 /* do the attach */
 197                 if ( OBT(obd) && OBP(obd, attach) ) {
 198                         err = OBP(obd, attach)(obd, sizeof(*data), data);
 199                 }
 200
 201                 if ( err ) {
 202                         obd->obd_type = NULL;
 203                         EXIT;
 204                 } else {
 205                         obd->obd_flags |=  OBD_ATTACHED;
 206                         type->typ_refcnt++;
 207                         printk("OBD: dev %d attached type %s\n",
 208                                obd->obd_minor, data->ioc_inlbuf1);
 209                         obd->obd_proc_entry =
 210                                 proc_lustre_register_obd_device(obd);
 211                         MOD_INC_USE_COUNT;
 212                         EXIT;
 213                 }
 214
 215                 return err;
 216         }
 217
 218         case OBD_IOC_DETACH: {
 219                 ENTRY;
 220                 if (obd->obd_flags & OBD_SET_UP) {
 221                         printk("OBD device %d still set up\n", obd->obd_minor);
 222                         return -EBUSY;
 223                 }
 224                 if (! (obd->obd_flags & OBD_ATTACHED) ) {
 225                         printk("OBD device %d not attached\n", obd->obd_minor);
 226                         return -ENODEV;
 227                 }
 228                 if ( !list_empty(&obd->obd_gen_clients) ) {
 229                         printk("OBD device %d has connected clients\n", obd->obd_minor);
 230                         return -EBUSY;
 231                 }
 232
 233                 if (obd->obd_proc_entry)
 234                         proc_lustre_release_obd_device(obd);
 235
 236                 obd->obd_flags &= ~OBD_ATTACHED;
 237                 obd->obd_type->typ_refcnt--;
 238                 obd->obd_type = NULL;
 239                 MOD_DEC_USE_COUNT;
 240                 EXIT;
 241                 return 0;
 242         }
 243
 244         case OBD_IOC_SETUP: {
 245                 ENTRY;
 246                 /* have we attached a type to this device? */
 247                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 248                         printk("Device %d not attached\n", obd->obd_minor);
 249                         return -ENODEV;
 250                 }
 251
 252                 /* has this been done already? */
 253                 if ( obd->obd_flags & OBD_SET_UP ) {
 254                         printk("Device %d already setup (type %s)\n",
 255                                obd->obd_minor, obd->obd_type->typ_name);
 256                         return -EBUSY;
 257                 }
 258
 259                 if ( OBT(obd) && OBP(obd, setup) )
 260                         err = OBP(obd, setup)(obd, sizeof(*data), data);
 261
 262                 if (!err) {
 263                         obd->obd_type->typ_refcnt++;
 264                         obd->obd_flags |= OBD_SET_UP;
 265                         EXIT;
 266                 }
 267
 268                 return err;
 269         }
 270         case OBD_IOC_CLEANUP: {
 271                 ENTRY;
 272
 273                 if ( !(obd->obd_flags & OBD_SET_UP) ) {
 274                         EXIT;
 275                         return -EINVAL;
 276                 }
 277
 278                 err = obd_cleanup(obd);
 279                 if ( err ) {
 280                         EXIT;
 281                         return err;
 282                 }
 283
 284                 obd->obd_flags &= ~OBD_SET_UP;
 285                 obd->obd_type->typ_refcnt--;
 286                 EXIT;
 287                 return 0;
 288         }
 289
 290         case OBD_IOC_CONNECT:
 291         {
 292                 conn.oc_id = data->ioc_conn1;
 293                 conn.oc_dev = obd;
 294
 295                 err = obd_connect(&conn);
 296
 297                 CDEBUG(D_IOCTL, "assigned connection %d\n", conn.oc_id);
 298                 data->ioc_conn1 = conn.oc_id;
 299                 if ( err )
 300                         return err;
 301
 302                 return copy_to_user((int *)arg, data, sizeof(*data));
 303         }
 304
 305         case OBD_IOC_DISCONNECT: {
 306                 conn.oc_id = data->ioc_conn1;
 307                 conn.oc_dev = obd;
 308
 309                 err = obd_disconnect(&conn);
 310                 return err;
 311         }
 312
 313         case OBD_IOC_DEC_USE_COUNT: {
 314                 MOD_DEC_USE_COUNT;
 315                 return 0;
 316         }
 317
 318         case OBD_IOC_CREATE: {
 319                 conn.oc_id = data->ioc_conn1;
 320                 conn.oc_dev = obd;
 321
 322                 err = obd_create(&conn, &data->ioc_obdo1);
 323                 if (err) {
 324                         EXIT;
 325                         return err;
 326                 }
 327
 328                 err = copy_to_user((int *)arg, data, sizeof(*data));
 329                 EXIT;
 330                 return err;
 331         }
 332
 333         case OBD_IOC_GETATTR: {
 334                 conn.oc_id = data->ioc_conn1;
 335                 conn.oc_dev = obd;
 336
 337                 err = obd_getattr(&conn, &data->ioc_obdo1);
 338                 if (err) {
 339                         EXIT;
 340                         return err;
 341                 }
 342
 343                 err = copy_to_user((int *)arg, data, sizeof(*data));
 344                 EXIT;
 345                 return err;
 346         }
 347
 348         case OBD_IOC_SETATTR: {
 349                 conn.oc_id = data->ioc_conn1;
 350                 conn.oc_dev = obd;
 351
 352                 err = obd_setattr(&conn, &data->ioc_obdo1);
 353                 if (err) {
 354                         EXIT;
 355                         return err;
 356                 }
 357
 358                 err = copy_to_user((int *)arg, data, sizeof(*data));
 359                 EXIT;
 360                 return err;
 361         }
 362
 363         case OBD_IOC_DESTROY: {
 364                 conn.oc_id = data->ioc_conn1;
 365                 conn.oc_dev = obd;
 366
 367                 err = obd_destroy(&conn, &data->ioc_obdo1);
 368                 if (err) {
 369                         EXIT;
 370                         return err;
 371                 }
 372
 373                 err = copy_to_user((int *)arg, data, sizeof(*data));
 374                 EXIT;
 375                 return err;
 376         }
 377
 378 #if 0
 379         case OBD_IOC_SYNC: {
 380                 struct oic_range_s *range = tmp_buf;
 381
 382                 if (!obd->obd_type)
 383                         return -ENODEV;
 384
 385                 err = copy_from_user(range, (const void *)arg,  sizeof(*range));
 386
 387                 if ( err ) {
 388                         EXIT;
 389                         return err;
 390                 }
 391
 392                 if ( !OBT(obd) || !OBP(obd, sync) ) {
 393                         err = -EOPNOTSUPP;
 394                         EXIT;
 395                         return err;
 396                 }
 397
 398                 /* XXX sync needs to be tested/verified */
 399                 err = OBP(obd, sync)(&conn, &range->obdo, range->count,
 400                                         range->offset);
 401
 402                 if ( err ) {
 403                         EXIT;
 404                         return err;
 405                 }
 406
 407                 return put_user(err, (int *) arg);
 408         }
 409
 410         case OBD_IOC_READ: {
 411                 int err;
 412                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 413
 414                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 415                 if ( err ) {
 416                         EXIT;
 417                         return err;
 418                 }
 419
 420                 conn.oc_id = rw_s->conn_id;
 421
 422                 if ( !OBT(obd) || !OBP(obd, read) ) {
 423                         err = -EOPNOTSUPP;
 424                         EXIT;
 425                         return err;
 426                 }
 427
 428
 429                 err = OBP(obd, read)(&conn, &rw_s->obdo, rw_s->buf,
 430                                         &rw_s->count, rw_s->offset);
 431
 432                 ODEBUG(&rw_s->obdo);
 433                 CDEBUG(D_INFO, "READ: conn %d, count %Ld, offset %Ld, '%s'\n",
 434                        rw_s->conn_id, rw_s->count, rw_s->offset, rw_s->buf);
 435                 if ( err ) {
 436                         EXIT;
 437                         return err;
 438                 }
 439
 440                 err = copy_to_user((int*)arg, &rw_s->count, sizeof(rw_s->count));
 441                 EXIT;
 442                 return err;
 443         }
 444
 445         case OBD_IOC_WRITE: {
 446                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 447
 448                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 449                 if ( err ) {
 450                         EXIT;
 451                         return err;
 452                 }
 453
 454                 conn.oc_id = rw_s->conn_id;
 455
 456                 if ( !OBT(obd) || !OBP(obd, write) ) {
 457                         err = -EOPNOTSUPP;
 458                         return err;
 459                 }
 460
 461                 CDEBUG(D_INFO, "WRITE: conn %d, count %Ld, offset %Ld, '%s'\n",
 462                        rw_s->conn_id, rw_s->count, rw_s->offset, rw_s->buf);
 463
 464                 err = OBP(obd, write)(&conn, &rw_s->obdo, rw_s->buf,
 465                                          &rw_s->count, rw_s->offset);
 466                 ODEBUG(&rw_s->obdo);
 467                 if ( err ) {
 468                         EXIT;
 469                         return err;
 470                 }
 471
 472                 err = copy_to_user((int *)arg, &rw_s->count,
 473                                    sizeof(rw_s->count));
 474                 EXIT;
 475                 return err;
 476         }
 477         case OBD_IOC_PREALLOCATE: {
 478                 struct oic_prealloc_s *prealloc = tmp_buf;
 479
 480                 /* has this minor been registered? */
 481                 if (!obd->obd_type)
 482                         return -ENODEV;
 483
 484                 err = copy_from_user(prealloc, (int *)arg, sizeof(*prealloc));
 485                 if (err)
 486                         return -EFAULT;
 487
 488                 if ( !(obd->obd_flags & OBD_ATTACHED) ||
 489                      !(obd->obd_flags & OBD_SET_UP)) {
 490                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 491                         return -ENODEV;
 492                 }
 493
 494                 if ( !OBT(obd) || !OBP(obd, preallocate) )
 495                         return -EOPNOTSUPP;
 496
 497                 conn.oc_id = prealloc->conn_id;
 498                 err = OBP(obd, preallocate)(&conn, &prealloc->alloc,
 499                                                prealloc->ids);
 500                 if ( err ) {
 501                         EXIT;
 502                         return err;
 503                 }
 504
 505                 err =copy_to_user((int *)arg, prealloc, sizeof(*prealloc));
 506                 EXIT;
 507                 return err;
 508         }
 509         case OBD_IOC_STATFS: {
 510                 struct statfs *tmp;
 511                 unsigned int conn_id;
 512                 struct statfs buf;
 513
 514                 /* has this minor been registered? */
 515                 if (!obd->obd_type)
 516                         return -ENODEV;
 517
 518                 tmp = (void *)arg + sizeof(unsigned int);
 519                 get_user(conn_id, (int *) arg);
 520
 521                 if ( !OBT(obd) || !OBP(obd, statfs) )
 522                         return -EOPNOTSUPP;
 523
 524                 conn.oc_id = conn_id;
 525                 err = OBP(obd, statfs)(&conn, &buf);
 526                 if ( err ) {
 527                         EXIT;
 528                         return err;
 529                 }
 530                 err = copy_to_user(tmp, &buf, sizeof(buf));
 531                 EXIT;
 532                 return err;
 533
 534         }
 535         case OBD_IOC_COPY: {
 536                 struct ioc_mv_s *mvdata = tmp_buf;
 537
 538                 if ( (!(obd->obd_flags & OBD_SET_UP)) ||
 539                      (!(obd->obd_flags & OBD_ATTACHED))) {
 540                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 541                         return -ENODEV;
 542                 }
 543
 544                 /* get main structure */
 545                 err = copy_from_user(mvdata, (void *) arg, sizeof(*mvdata));
 546                 if (err) {
 547                         EXIT;
 548                         return err;
 549                 }
 550
 551                 if ( !OBT(obd) || !OBP(obd, copy) )
 552                         return -EOPNOTSUPP;
 553
 554                 /* do the partition */
 555                 CDEBUG(D_INFO, "Copy %d, type %s dst %Ld src %Ld\n", dev,
 556                        obd->obd_type->typ_name, mvdata->dst.o_id,
 557                        mvdata->src.o_id);
 558
 559                 conn.oc_id = mvdata->src_conn_id;
 560
 561                 err = OBP(obd, copy)(&conn, &mvdata->dst,
 562                                         &conn, &mvdata->src,
 563                                         mvdata->src.o_size, 0);
 564                 return err;
 565         }
 566
 567         case OBD_IOC_MIGR: {
 568                 struct ioc_mv_s *mvdata = tmp_buf;
 569
 570                 if ( (!(obd->obd_flags & OBD_SET_UP)) ||
 571                      (!(obd->obd_flags & OBD_ATTACHED))) {
 572                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 573                         return -ENODEV;
 574                 }
 575
 576                 err = copy_from_user(mvdata, (void *) arg, sizeof(*mvdata));
 577                 if (err) {
 578                         EXIT;
 579                         return err;
 580                 }
 581
 582                 CDEBUG(D_INFO, "Migrate copying %d bytes\n", sizeof(*mvdata));
 583
 584                 if ( !OBT(obd) || !OBP(obd, migrate) )
 585                         return -EOPNOTSUPP;
 586
 587                 /* do the partition */
 588                 CDEBUG(D_INFO, "Migrate %d, type %s conn %d src %Ld dst %Ld\n",
 589                        dev, obd->obd_type->typ_name, mvdata->src_conn_id,
 590                        mvdata->src.o_id, mvdata->dst.o_id);
 591
 592                 conn.oc_id = mvdata->src_conn_id;
 593                 err = OBP(obd, migrate)(&conn, &mvdata->dst, &mvdata->src,
 594                                            mvdata->src.o_size, 0);
 595
 596                 return err;
 597         }
 598         case OBD_IOC_PUNCH: {
 599                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 600
 601                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 602                 if ( err ) {
 603                         EXIT;
 604                         return err;
 605                 }
 606
 607                 conn.oc_id = rw_s->conn_id;
 608
 609                 if ( !OBT(obd) || !OBP(obd, punch) ) {
 610                         err = -EOPNOTSUPP;
 611                         return err;
 612                 }
 613
 614                 CDEBUG(D_INFO, "PUNCH: conn %d, count %Ld, offset %Ld\n",
 615                        rw_s->conn_id, rw_s->count, rw_s->offset);
 616                 err = OBP(obd, punch)(&conn, &rw_s->obdo, rw_s->count,
 617                                          rw_s->offset);
 618                 ODEBUG(&rw_s->obdo);
 619                 if ( err ) {
 620                         EXIT;
 621                         return err;
 622                 }
 623                 EXIT;
 624                 return err;
 625         }
 626
 627         default: {
 628                 struct obd_type *type;
 629                 struct oic_generic input;
 630                 char *nm;
 631                 void *karg;
 632
 633                 /* get data structures */
 634                 err = copy_from_user(&input, (void *)arg, sizeof(input));
 635                 if ( err ) {
 636                         EXIT;
 637                         return err;
 638                 }
 639
 640                 err = getdata(input.att_typelen + 1, &input.att_type);
 641                 if ( err ) {
 642                         EXIT;
 643                         return err;
 644                 }
 645
 646                 /* find the type */
 647                 nm = input.att_type;
 648                 type = obd_nm_to_type(nm);
 649 #ifdef CONFIG_KMOD
 650                 if ( !type ) {
 651                         if ( !request_module(nm) ) {
 652                                 CDEBUG(D_PSDEV, "Loaded module '%s'\n", nm);
 653                                 type = obd_nm_to_type(nm);
 654                         } else {
 655                                 CDEBUG(D_PSDEV, "Can't load module '%s'\n", nm);
 656                         }
 657                 }
 658 #endif
 659                 OBD_FREE(input.att_type, input.att_typelen + 1);
 660                 if ( !type ) {
 661                         printk(__FUNCTION__ ": unknown obd type dev %d\n", dev);
 662                         EXIT;
 663                         return -EINVAL;
 664                 }
 665
 666                 if ( !type->typ_ops || !type->typ_ops->o_iocontrol ) {
 667                         EXIT;
 668                         return -EOPNOTSUPP;
 669                 }
 670                 conn.oc_id = input.att_connid;
 671
 672                 CDEBUG(D_INFO, "Calling ioctl %x for type %s, len %d\n",
 673                        cmd, type->typ_name, input.att_datalen);
 674
 675                 /* get the generic data */
 676                 karg = input.att_data;
 677                 err = getdata(input.att_datalen, &karg);
 678                 if ( err ) {
 679                         EXIT;
 680                         return err;
 681                 }
 682
 683                 err = type->typ_ops->o_iocontrol(cmd, &conn, input.att_datalen,
 684                                                  karg, input.att_data);
 685                 OBD_FREE(karg, input.att_datalen);
 686
 687                 EXIT;
 688                 return err;
 689         }
 690 #endif
 691         default:
 692                 return -EINVAL;
 693
 694         }
 695 } /* obd_class_ioctl */
 696
 697
 698 /* Driver interface done, utility functions follow */
 699 int obd_register_type(struct obd_ops *ops, char *nm)
 700 {
 701         struct obd_type *type;
 702
 703         if (obd_init_magic != 0x11223344) {
 704                 printk(__FUNCTION__ ": bad magic for type\n");
 705                 EXIT;
 706                 return -EINVAL;
 707         }
 708
 709         if  ( obd_nm_to_type(nm) ) {
 710                 CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
 711                 EXIT;
 712                 return -EEXIST;
 713         }
 714
 715         OBD_ALLOC(type, sizeof(*type));
 716         if ( !type ) {
 717                 EXIT;
 718                 return -ENOMEM;
 719         }
 720         memset(type, 0, sizeof(*type));
 721         INIT_LIST_HEAD(&type->typ_chain);
 722         MOD_INC_USE_COUNT;
 723         list_add(&type->typ_chain, obd_types.next);
 724         type->typ_ops = ops;
 725         type->typ_name = nm;
 726         EXIT;
 727         return 0;
 728 }
 729
 730 int obd_unregister_type(char *nm)
 731 {
 732         struct obd_type *type = obd_nm_to_type(nm);
 733
 734         if ( !type ) {
 735                 MOD_DEC_USE_COUNT;
 736                 printk(KERN_INFO __FUNCTION__ ": unknown obd type\n");
 737                 EXIT;
 738                 return -EINVAL;
 739         }
 740
 741         if ( type->typ_refcnt ) {
 742                 MOD_DEC_USE_COUNT;
 743                 printk(KERN_ALERT __FUNCTION__ ":type %s has refcount "
 744                        "(%d)\n", nm, type->typ_refcnt);
 745                 EXIT;
 746                 return -EBUSY;
 747         }
 748
 749         list_del(&type->typ_chain);
 750         OBD_FREE(type, sizeof(*type));
 751         MOD_DEC_USE_COUNT;
 752         return 0;
 753 } /* obd_unregister_type */
 754
 755 /* declare character device */
 756 static struct file_operations obd_psdev_fops = {
 757         ioctl: obd_class_ioctl,       /* ioctl */
 758         open: obd_class_open,        /* open */
 759         release: obd_class_release,     /* release */
 760 };
 761
 762 /* modules setup */
 763 #define OBD_MINOR 241
 764 static struct miscdevice obd_psdev = {
 765         OBD_MINOR,
 766         "obd_psdev",
 767         &obd_psdev_fops
 768 };
 769
 770 int init_obd(void)
 771 {
 772         int err;
 773         int i;
 774
 775         printk(KERN_INFO "OBD class driver  v0.01, braam@stelias.com\n");
 776
 777         INIT_LIST_HEAD(&obd_types);
 778
 779         if ( (err = misc_register(&obd_psdev)) ) {
 780                 printk(KERN_ERR __FUNCTION__ ": cannot register %d err %d\n",
 781                        OBD_MINOR, err);
 782                 return -EIO;
 783         }
 784
 785         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 786                 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
 787                 obd_dev[i].obd_minor = i;
 788                 INIT_LIST_HEAD(&obd_dev[i].obd_gen_clients);
 789         }
 790
 791         err = obd_init_obdo_cache();
 792         if (err)
 793                 return err;
 794         obd_sysctl_init();
 795         obd_init_magic = 0x11223344;
 796         return 0;
 797 }
 798
 799 EXPORT_SYMBOL(obd_register_type);
 800 EXPORT_SYMBOL(obd_unregister_type);
 801
 802 EXPORT_SYMBOL(obd_print_entry);
 803 EXPORT_SYMBOL(obd_debug_level);
 804 EXPORT_SYMBOL(obd_dev);
 805
 806 EXPORT_SYMBOL(gen_connect);
 807 EXPORT_SYMBOL(gen_client);
 808 EXPORT_SYMBOL(gen_cleanup);
 809 EXPORT_SYMBOL(gen_disconnect);
 810 EXPORT_SYMBOL(gen_copy_data);
 811 EXPORT_SYMBOL(obdo_cachep);
 812
 813 /* EXPORT_SYMBOL(gen_multi_attach); */
 814 EXPORT_SYMBOL(gen_multi_setup);
 815 EXPORT_SYMBOL(gen_multi_cleanup);
 816 EXPORT_SYMBOL(obd_memory);
 817
 818 #ifdef MODULE
 819 int init_module(void)
 820 {
 821         return init_obd();
 822 }
 823
 824 void cleanup_module(void)
 825 {
 826         int i;
 827         ENTRY;
 828
 829         misc_deregister(&obd_psdev);
 830         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 831                 struct obd_device *obd = &obd_dev[i];
 832                 if ( obd->obd_type &&
 833                      (obd->obd_flags & OBD_SET_UP) &&
 834                      OBT(obd) && OBP(obd, detach) ) {
 835                         /* XXX should this call generic detach otherwise? */
 836                         OBP(obd, detach)(obd);
 837                 }
 838         }
 839
 840         obd_cleanup_obdo_cache();
 841         obd_sysctl_clean();
 842         CDEBUG(D_MALLOC, "CLASS mem used %ld\n", obd_memory);
 843         obd_init_magic = 0;
 844         EXIT;
 845 }
 846 #endif