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 #define DEBUG_SUBSYSTEM S_CLASS
  56
  57 #include <linux/obd_support.h>
  58 #include <linux/obd_class.h>
  59
  60 static int obd_init_magic;
  61 int obd_print_entry = 1;
  62 int obd_debug_level = ~0;
  63 unsigned long obd_memory = 0;
  64 struct obd_device obd_dev[MAX_OBD_DEVICES];
  65 struct list_head obd_types;
  66
  67 /*  opening /dev/obd */
  68 static int obd_class_open(struct inode * inode, struct file * file)
  69 {
  70         ENTRY;
  71
  72         file->private_data = NULL;
  73         MOD_INC_USE_COUNT;
  74         EXIT;
  75         return 0;
  76 }
  77
  78 /*  closing /dev/obd */
  79 static int obd_class_release(struct inode * inode, struct file * file)
  80 {
  81         ENTRY;
  82
  83         if (file->private_data)
  84                 file->private_data = NULL;
  85
  86         MOD_DEC_USE_COUNT;
  87         EXIT;
  88         return 0;
  89 }
  90
  91 /*
  92  * support functions: we could use inter-module communication, but this
  93  * is more portable to other OS's
  94  */
  95 static struct obd_type *obd_search_type(char *nm)
  96 {
  97         struct list_head *tmp;
  98         struct obd_type *type;
  99         CDEBUG(D_INFO, "SEARCH %s\n", nm);
 100
 101         tmp = &obd_types;
 102         while ( (tmp = tmp->next) != &obd_types ) {
 103                 type = list_entry(tmp, struct obd_type, typ_chain);
 104                 CDEBUG(D_INFO, "TYP %s\n", type->typ_name);
 105                 if (strlen(type->typ_name) == strlen(nm) &&
 106                     strcmp(type->typ_name, nm) == 0 ) {
 107                         return type;
 108                 }
 109         }
 110         return NULL;
 111 }
 112
 113 static struct obd_type *obd_nm_to_type(char *nm)
 114 {
 115         struct obd_type *type = obd_search_type(nm);
 116
 117 #ifdef CONFIG_KMOD
 118         if ( !type ) {
 119                 if ( !request_module(nm) ) {
 120                         CDEBUG(D_INFO, "Loaded module '%s'\n", nm);
 121                         type = obd_search_type(nm);
 122                 } else {
 123                         CDEBUG(D_INFO, "Can't load module '%s'\n", nm);
 124                 }
 125         }
 126 #endif
 127         return type;
 128 }
 129
 130 /* to control /dev/obd */
 131 static int obd_class_ioctl (struct inode * inode, struct file * filp,
 132                             unsigned int cmd, unsigned long arg)
 133 {
 134         /* NOTE this must be larger than any of the ioctl data structs */
 135         char buf[1024];
 136         struct obd_ioctl_data *data;
 137         struct obd_device *obd = filp->private_data;
 138         struct obd_conn conn;
 139         int err = 0;
 140         ENTRY;
 141
 142         memset(buf, 0, sizeof(buf));
 143
 144         if (!obd && cmd != OBD_IOC_DEVICE && cmd != TCGETS) {
 145                 CERROR("OBD ioctl: No device\n");
 146                 return -EINVAL;
 147         }
 148         if (obd_ioctl_getdata(buf, buf + 800, (void *)arg)) {
 149                 CERROR("OBD ioctl: data error\n");
 150                 return -EINVAL;
 151         }
 152         data = (struct obd_ioctl_data *)buf;
 153
 154         switch (cmd) {
 155         case TCGETS: {
 156                 EXIT;
 157                 return -EINVAL;
 158         }
 159         case OBD_IOC_DEVICE: {
 160                 CDEBUG(D_IOCTL, "\n");
 161                 if (data->ioc_dev >= MAX_OBD_DEVICES ||
 162                     data->ioc_dev < 0) {
 163                         CERROR("OBD ioctl: DEVICE insufficient devices\n");
 164                         return -EINVAL;
 165                 }
 166                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 167
 168                 filp->private_data = &obd_dev[data->ioc_dev];
 169                 EXIT;
 170                 return 0;
 171         }
 172
 173         case OBD_IOC_ATTACH: {
 174                 struct obd_type *type;
 175
 176                 ENTRY;
 177                 /* have we attached a type to this device */
 178                 if ( obd->obd_flags & OBD_ATTACHED ) {
 179                         CERROR("OBD: Device %d already typed as  %s.\n",
 180                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 181                         return -EBUSY;
 182                 }
 183
 184                 CDEBUG(D_IOCTL, "attach %s %s\n",  MKSTR(data->ioc_inlbuf1),
 185                        MKSTR(data->ioc_inlbuf2));
 186
 187                 /* find the type */
 188                 type = obd_nm_to_type(data->ioc_inlbuf1);
 189                 if ( !type ) {
 190                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 191                         return -EINVAL;
 192                 }
 193
 194                 obd->obd_type = type;
 195                 obd->obd_multi_count = 0;
 196                 INIT_LIST_HEAD(&obd->obd_gen_clients);
 197                 INIT_LIST_HEAD(&obd->obd_req_list);
 198
 199                 /* do the attach */
 200                 if ( OBT(obd) && OBP(obd, attach) ) {
 201                         err = OBP(obd, attach)(obd, sizeof(*data), data);
 202                 }
 203
 204                 if ( err ) {
 205                         obd->obd_type = NULL;
 206                         EXIT;
 207                 } else {
 208                         obd->obd_flags |=  OBD_ATTACHED;
 209                         type->typ_refcnt++;
 210                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 211                                obd->obd_minor, data->ioc_inlbuf1);
 212                         obd->obd_proc_entry =
 213                                 proc_lustre_register_obd_device(obd);
 214                         MOD_INC_USE_COUNT;
 215                         EXIT;
 216                 }
 217
 218                 return err;
 219         }
 220
 221         case OBD_IOC_DETACH: {
 222                 ENTRY;
 223                 if (obd->obd_flags & OBD_SET_UP) {
 224                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 225                         return -EBUSY;
 226                 }
 227                 if (! (obd->obd_flags & OBD_ATTACHED) ) {
 228                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 229                         return -ENODEV;
 230                 }
 231                 if ( !list_empty(&obd->obd_gen_clients) ) {
 232                         CERROR("OBD device %d has connected clients\n",
 233                                obd->obd_minor);
 234                         return -EBUSY;
 235                 }
 236                 if ( !list_empty(&obd->obd_req_list) ) {
 237                         CERROR("OBD device %d has hanging requests\n",
 238                                obd->obd_minor);
 239                         return -EBUSY;
 240                 }
 241
 242                 if (obd->obd_proc_entry)
 243                         proc_lustre_release_obd_device(obd);
 244
 245                 obd->obd_flags &= ~OBD_ATTACHED;
 246                 obd->obd_type->typ_refcnt--;
 247                 obd->obd_type = NULL;
 248                 MOD_DEC_USE_COUNT;
 249                 EXIT;
 250                 return 0;
 251         }
 252
 253         case OBD_IOC_SETUP: {
 254                 ENTRY;
 255                 /* have we attached a type to this device? */
 256                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 257                         CERROR("Device %d not attached\n", obd->obd_minor);
 258                         return -ENODEV;
 259                 }
 260
 261                 /* has this been done already? */
 262                 if ( obd->obd_flags & OBD_SET_UP ) {
 263                         CERROR("Device %d already setup (type %s)\n",
 264                                obd->obd_minor, obd->obd_type->typ_name);
 265                         return -EBUSY;
 266                 }
 267
 268                 if ( OBT(obd) && OBP(obd, setup) )
 269                         err = obd_setup(obd, sizeof(*data), data);
 270
 271                 if (!err) {
 272                         obd->obd_type->typ_refcnt++;
 273                         obd->obd_flags |= OBD_SET_UP;
 274                         EXIT;
 275                 }
 276
 277                 return err;
 278         }
 279         case OBD_IOC_CLEANUP: {
 280                 ENTRY;
 281
 282                 /* have we attached a type to this device? */
 283                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 284                         CERROR("Device %d not attached\n", obd->obd_minor);
 285                         return -ENODEV;
 286                 }
 287
 288                 if ( OBT(obd) && OBP(obd, cleanup) )
 289                         err = obd_cleanup(obd);
 290
 291                 if (!err) {
 292                         obd->obd_flags &= ~OBD_SET_UP;
 293                         obd->obd_type->typ_refcnt--;
 294                         EXIT;
 295                 }
 296                 return err;
 297         }
 298
 299         case OBD_IOC_CONNECT:
 300         {
 301                 conn.oc_id = data->ioc_conn1;
 302                 conn.oc_dev = obd;
 303
 304                 err = obd_connect(&conn);
 305
 306                 CDEBUG(D_IOCTL, "assigned connection %d\n", conn.oc_id);
 307                 data->ioc_conn1 = conn.oc_id;
 308                 if ( err )
 309                         return err;
 310
 311                 return copy_to_user((int *)arg, data, sizeof(*data));
 312         }
 313
 314         case OBD_IOC_DISCONNECT: {
 315                 conn.oc_id = data->ioc_conn1;
 316                 conn.oc_dev = obd;
 317
 318                 err = obd_disconnect(&conn);
 319                 return err;
 320         }
 321
 322         case OBD_IOC_DEC_USE_COUNT: {
 323                 MOD_DEC_USE_COUNT;
 324                 return 0;
 325         }
 326
 327         case OBD_IOC_CREATE: {
 328                 conn.oc_id = data->ioc_conn1;
 329                 conn.oc_dev = obd;
 330
 331                 err = obd_create(&conn, &data->ioc_obdo1);
 332                 if (err) {
 333                         EXIT;
 334                         return err;
 335                 }
 336
 337                 err = copy_to_user((int *)arg, data, sizeof(*data));
 338                 EXIT;
 339                 return err;
 340         }
 341
 342         case OBD_IOC_GETATTR: {
 343                 conn.oc_id = data->ioc_conn1;
 344                 conn.oc_dev = obd;
 345
 346                 err = obd_getattr(&conn, &data->ioc_obdo1);
 347                 if (err) {
 348                         EXIT;
 349                         return err;
 350                 }
 351
 352                 err = copy_to_user((int *)arg, data, sizeof(*data));
 353                 EXIT;
 354                 return err;
 355         }
 356
 357         case OBD_IOC_SETATTR: {
 358                 conn.oc_id = data->ioc_conn1;
 359                 conn.oc_dev = obd;
 360
 361                 err = obd_setattr(&conn, &data->ioc_obdo1);
 362                 if (err) {
 363                         EXIT;
 364                         return err;
 365                 }
 366
 367                 err = copy_to_user((int *)arg, data, sizeof(*data));
 368                 EXIT;
 369                 return err;
 370         }
 371
 372         case OBD_IOC_DESTROY: {
 373                 conn.oc_id = data->ioc_conn1;
 374                 conn.oc_dev = obd;
 375
 376                 err = obd_destroy(&conn, &data->ioc_obdo1);
 377                 if (err) {
 378                         EXIT;
 379                         return err;
 380                 }
 381
 382                 err = copy_to_user((int *)arg, data, sizeof(*data));
 383                 EXIT;
 384                 return err;
 385         }
 386
 387 #if 0
 388         case OBD_IOC_SYNC: {
 389                 struct oic_range_s *range = tmp_buf;
 390
 391                 if (!obd->obd_type)
 392                         return -ENODEV;
 393
 394                 err = copy_from_user(range, (const void *)arg,  sizeof(*range));
 395
 396                 if ( err ) {
 397                         EXIT;
 398                         return err;
 399                 }
 400
 401                 if ( !OBT(obd) || !OBP(obd, sync) ) {
 402                         err = -EOPNOTSUPP;
 403                         EXIT;
 404                         return err;
 405                 }
 406
 407                 /* XXX sync needs to be tested/verified */
 408                 err = OBP(obd, sync)(&conn, &range->obdo, range->count,
 409                                         range->offset);
 410
 411                 if ( err ) {
 412                         EXIT;
 413                         return err;
 414                 }
 415
 416                 return put_user(err, (int *) arg);
 417         }
 418
 419         case OBD_IOC_READ: {
 420                 int err;
 421                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 422
 423                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 424                 if ( err ) {
 425                         EXIT;
 426                         return err;
 427                 }
 428
 429                 conn.oc_id = rw_s->conn_id;
 430
 431                 if ( !OBT(obd) || !OBP(obd, read) ) {
 432                         err = -EOPNOTSUPP;
 433                         EXIT;
 434                         return err;
 435                 }
 436
 437
 438                 err = OBP(obd, read)(&conn, &rw_s->obdo, rw_s->buf,
 439                                         &rw_s->count, rw_s->offset);
 440
 441                 CDEBUG(D_INFO, "READ: conn %d, count %Ld, offset %Ld, '%s'\n",
 442                        rw_s->conn_id, rw_s->count, rw_s->offset, rw_s->buf);
 443                 if ( err ) {
 444                         EXIT;
 445                         return err;
 446                 }
 447
 448                 err = copy_to_user((int*)arg, &rw_s->count, sizeof(rw_s->count));
 449                 EXIT;
 450                 return err;
 451         }
 452
 453         case OBD_IOC_WRITE: {
 454                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 455
 456                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 457                 if ( err ) {
 458                         EXIT;
 459                         return err;
 460                 }
 461
 462                 conn.oc_id = rw_s->conn_id;
 463
 464                 if ( !OBT(obd) || !OBP(obd, write) ) {
 465                         err = -EOPNOTSUPP;
 466                         return err;
 467                 }
 468
 469                 CDEBUG(D_INFO, "WRITE: conn %d, count %Ld, offset %Ld, '%s'\n",
 470                        rw_s->conn_id, rw_s->count, rw_s->offset, rw_s->buf);
 471
 472                 err = OBP(obd, write)(&conn, &rw_s->obdo, rw_s->buf,
 473                                          &rw_s->count, rw_s->offset);
 474                 if ( err ) {
 475                         EXIT;
 476                         return err;
 477                 }
 478
 479                 err = copy_to_user((int *)arg, &rw_s->count,
 480                                    sizeof(rw_s->count));
 481                 EXIT;
 482                 return err;
 483         }
 484         case OBD_IOC_PREALLOCATE: {
 485                 struct oic_prealloc_s *prealloc = tmp_buf;
 486
 487                 /* has this minor been registered? */
 488                 if (!obd->obd_type)
 489                         return -ENODEV;
 490
 491                 err = copy_from_user(prealloc, (int *)arg, sizeof(*prealloc));
 492                 if (err)
 493                         return -EFAULT;
 494
 495                 if ( !(obd->obd_flags & OBD_ATTACHED) ||
 496                      !(obd->obd_flags & OBD_SET_UP)) {
 497                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 498                         return -ENODEV;
 499                 }
 500
 501                 if ( !OBT(obd) || !OBP(obd, preallocate) )
 502                         return -EOPNOTSUPP;
 503
 504                 conn.oc_id = prealloc->conn_id;
 505                 err = OBP(obd, preallocate)(&conn, &prealloc->alloc,
 506                                                prealloc->ids);
 507                 if ( err ) {
 508                         EXIT;
 509                         return err;
 510                 }
 511
 512                 err =copy_to_user((int *)arg, prealloc, sizeof(*prealloc));
 513                 EXIT;
 514                 return err;
 515         }
 516         case OBD_IOC_STATFS: {
 517                 struct statfs *tmp;
 518                 unsigned int conn_id;
 519                 struct statfs buf;
 520
 521                 /* has this minor been registered? */
 522                 if (!obd->obd_type)
 523                         return -ENODEV;
 524
 525                 tmp = (void *)arg + sizeof(unsigned int);
 526                 get_user(conn_id, (int *) arg);
 527
 528                 if ( !OBT(obd) || !OBP(obd, statfs) )
 529                         return -EOPNOTSUPP;
 530
 531                 conn.oc_id = conn_id;
 532                 err = OBP(obd, statfs)(&conn, &buf);
 533                 if ( err ) {
 534                         EXIT;
 535                         return err;
 536                 }
 537                 err = copy_to_user(tmp, &buf, sizeof(buf));
 538                 EXIT;
 539                 return err;
 540
 541         }
 542         case OBD_IOC_COPY: {
 543                 struct ioc_mv_s *mvdata = tmp_buf;
 544
 545                 if ( (!(obd->obd_flags & OBD_SET_UP)) ||
 546                      (!(obd->obd_flags & OBD_ATTACHED))) {
 547                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 548                         return -ENODEV;
 549                 }
 550
 551                 /* get main structure */
 552                 err = copy_from_user(mvdata, (void *) arg, sizeof(*mvdata));
 553                 if (err) {
 554                         EXIT;
 555                         return err;
 556                 }
 557
 558                 if ( !OBT(obd) || !OBP(obd, copy) )
 559                         return -EOPNOTSUPP;
 560
 561                 /* do the partition */
 562                 CDEBUG(D_INFO, "Copy %d, type %s dst %Ld src %Ld\n", dev,
 563                        obd->obd_type->typ_name, mvdata->dst.o_id,
 564                        mvdata->src.o_id);
 565
 566                 conn.oc_id = mvdata->src_conn_id;
 567
 568                 err = OBP(obd, copy)(&conn, &mvdata->dst,
 569                                         &conn, &mvdata->src,
 570                                         mvdata->src.o_size, 0);
 571                 return err;
 572         }
 573
 574         case OBD_IOC_MIGR: {
 575                 struct ioc_mv_s *mvdata = tmp_buf;
 576
 577                 if ( (!(obd->obd_flags & OBD_SET_UP)) ||
 578                      (!(obd->obd_flags & OBD_ATTACHED))) {
 579                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 580                         return -ENODEV;
 581                 }
 582
 583                 err = copy_from_user(mvdata, (void *) arg, sizeof(*mvdata));
 584                 if (err) {
 585                         EXIT;
 586                         return err;
 587                 }
 588
 589                 CDEBUG(D_INFO, "Migrate copying %d bytes\n", sizeof(*mvdata));
 590
 591                 if ( !OBT(obd) || !OBP(obd, migrate) )
 592                         return -EOPNOTSUPP;
 593
 594                 /* do the partition */
 595                 CDEBUG(D_INFO, "Migrate %d, type %s conn %d src %Ld dst %Ld\n",
 596                        dev, obd->obd_type->typ_name, mvdata->src_conn_id,
 597                        mvdata->src.o_id, mvdata->dst.o_id);
 598
 599                 conn.oc_id = mvdata->src_conn_id;
 600                 err = OBP(obd, migrate)(&conn, &mvdata->dst, &mvdata->src,
 601                                            mvdata->src.o_size, 0);
 602
 603                 return err;
 604         }
 605         case OBD_IOC_PUNCH: {
 606                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 607
 608                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 609                 if ( err ) {
 610                         EXIT;
 611                         return err;
 612                 }
 613
 614                 conn.oc_id = rw_s->conn_id;
 615
 616                 if ( !OBT(obd) || !OBP(obd, punch) ) {
 617                         err = -EOPNOTSUPP;
 618                         return err;
 619                 }
 620
 621                 CDEBUG(D_INFO, "PUNCH: conn %d, count %Ld, offset %Ld\n",
 622                        rw_s->conn_id, rw_s->count, rw_s->offset);
 623                 err = OBP(obd, punch)(&conn, &rw_s->obdo, rw_s->count,
 624                                          rw_s->offset);
 625                 if ( err ) {
 626                         EXIT;
 627                         return err;
 628                 }
 629                 EXIT;
 630                 return err;
 631         }
 632
 633         default: {
 634                 struct obd_type *type;
 635                 struct oic_generic input;
 636                 char *nm;
 637                 void *karg;
 638
 639                 /* get data structures */
 640                 err = copy_from_user(&input, (void *)arg, sizeof(input));
 641                 if ( err ) {
 642                         EXIT;
 643                         return err;
 644                 }
 645
 646                 err = getdata(input.att_typelen + 1, &input.att_type);
 647                 if ( err ) {
 648                         EXIT;
 649                         return err;
 650                 }
 651
 652                 /* find the type */
 653                 nm = input.att_type;
 654                 type = obd_nm_to_type(nm);
 655 #ifdef CONFIG_KMOD
 656                 if ( !type ) {
 657                         if ( !request_module(nm) ) {
 658                                 CDEBUG(D_INFO, "Loaded module '%s'\n", nm);
 659                                 type = obd_nm_to_type(nm);
 660                         } else {
 661                                 CDEBUG(D_INFO, "Can't load module '%s'\n", nm);
 662                         }
 663                 }
 664 #endif
 665                 OBD_FREE(input.att_type, input.att_typelen + 1);
 666                 if ( !type ) {
 667                         CERROR("unknown obd type dev %d\n", dev);
 668                         EXIT;
 669                         return -EINVAL;
 670                 }
 671
 672                 if ( !type->typ_ops || !type->typ_ops->o_iocontrol ) {
 673                         EXIT;
 674                         return -EOPNOTSUPP;
 675                 }
 676                 conn.oc_id = input.att_connid;
 677
 678                 CDEBUG(D_INFO, "Calling ioctl %x for type %s, len %d\n",
 679                        cmd, type->typ_name, input.att_datalen);
 680
 681                 /* get the generic data */
 682                 karg = input.att_data;
 683                 err = getdata(input.att_datalen, &karg);
 684                 if ( err ) {
 685                         EXIT;
 686                         return err;
 687                 }
 688
 689                 err = type->typ_ops->o_iocontrol(cmd, &conn, input.att_datalen,
 690                                                  karg, input.att_data);
 691                 OBD_FREE(karg, input.att_datalen);
 692
 693                 EXIT;
 694                 return err;
 695         }
 696 #endif
 697         default:
 698                 return -EINVAL;
 699
 700         }
 701 } /* obd_class_ioctl */
 702
 703
 704 /* Driver interface done, utility functions follow */
 705 int obd_register_type(struct obd_ops *ops, char *nm)
 706 {
 707         struct obd_type *type;
 708
 709         if (obd_init_magic != 0x11223344) {
 710                 CERROR("bad magic for type\n");
 711                 EXIT;
 712                 return -EINVAL;
 713         }
 714
 715         if  ( obd_nm_to_type(nm) ) {
 716                 CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
 717                 EXIT;
 718                 return -EEXIST;
 719         }
 720
 721         OBD_ALLOC(type, sizeof(*type));
 722         if ( !type ) {
 723                 EXIT;
 724                 return -ENOMEM;
 725         }
 726         memset(type, 0, sizeof(*type));
 727         INIT_LIST_HEAD(&type->typ_chain);
 728         MOD_INC_USE_COUNT;
 729         list_add(&type->typ_chain, obd_types.next);
 730         type->typ_ops = ops;
 731         type->typ_name = nm;
 732         EXIT;
 733         return 0;
 734 }
 735
 736 int obd_unregister_type(char *nm)
 737 {
 738         struct obd_type *type = obd_nm_to_type(nm);
 739
 740         if ( !type ) {
 741                 MOD_DEC_USE_COUNT;
 742                 CERROR("unknown obd type\n");
 743                 EXIT;
 744                 return -EINVAL;
 745         }
 746
 747         if ( type->typ_refcnt ) {
 748                 MOD_DEC_USE_COUNT;
 749                 CERROR("type %s has refcount (%d)\n", nm, type->typ_refcnt);
 750                 EXIT;
 751                 return -EBUSY;
 752         }
 753
 754         list_del(&type->typ_chain);
 755         OBD_FREE(type, sizeof(*type));
 756         MOD_DEC_USE_COUNT;
 757         return 0;
 758 } /* obd_unregister_type */
 759
 760 /* declare character device */
 761 static struct file_operations obd_psdev_fops = {
 762         ioctl: obd_class_ioctl,       /* ioctl */
 763         open: obd_class_open,        /* open */
 764         release: obd_class_release,     /* release */
 765 };
 766
 767 /* modules setup */
 768 #define OBD_MINOR 241
 769 static struct miscdevice obd_psdev = {
 770         OBD_MINOR,
 771         "obd_psdev",
 772         &obd_psdev_fops
 773 };
 774
 775
 776 EXPORT_SYMBOL(obd_register_type);
 777 EXPORT_SYMBOL(obd_unregister_type);
 778
 779 EXPORT_SYMBOL(obd_print_entry);
 780 EXPORT_SYMBOL(obd_debug_level);
 781 EXPORT_SYMBOL(obd_dev);
 782
 783 EXPORT_SYMBOL(gen_connect);
 784 EXPORT_SYMBOL(gen_client);
 785 EXPORT_SYMBOL(gen_cleanup);
 786 EXPORT_SYMBOL(gen_disconnect);
 787 EXPORT_SYMBOL(gen_copy_data);
 788 EXPORT_SYMBOL(obdo_cachep);
 789
 790 /* EXPORT_SYMBOL(gen_multi_attach); */
 791 EXPORT_SYMBOL(gen_multi_setup);
 792 EXPORT_SYMBOL(gen_multi_cleanup);
 793 EXPORT_SYMBOL(obd_memory);
 794
 795 static int __init init_obdclass(void)
 796 {
 797         int err;
 798         int i;
 799
 800         printk(KERN_INFO "OBD class driver  v0.01, braam@stelias.com\n");
 801
 802         INIT_LIST_HEAD(&obd_types);
 803
 804         if ( (err = misc_register(&obd_psdev)) ) {
 805                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 806                 return -EIO;
 807         }
 808
 809         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 810                 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
 811                 obd_dev[i].obd_minor = i;
 812                 INIT_LIST_HEAD(&obd_dev[i].obd_gen_clients);
 813                 INIT_LIST_HEAD(&obd_dev[i].obd_req_list);
 814                 init_waitqueue_head(&obd_dev[i].obd_req_waitq);
 815         }
 816
 817         err = obd_init_obdo_cache();
 818         if (err)
 819                 return err;
 820         obd_sysctl_init();
 821         obd_init_magic = 0x11223344;
 822         return 0;
 823 }
 824
 825 static void __exit cleanup_obdclass(void)
 826 {
 827         int i;
 828         ENTRY;
 829
 830         misc_deregister(&obd_psdev);
 831         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 832                 struct obd_device *obd = &obd_dev[i];
 833                 if ( obd->obd_type &&
 834                      (obd->obd_flags & OBD_SET_UP) &&
 835                      OBT(obd) && OBP(obd, detach) ) {
 836                         /* XXX should this call generic detach otherwise? */
 837                         OBP(obd, detach)(obd);
 838                 }
 839         }
 840
 841         obd_cleanup_obdo_cache();
 842         obd_sysctl_clean();
 843         CERROR("obd memory leaked: %ld bytes\n", obd_memory);
 844         obd_init_magic = 0;
 845         EXIT;
 846 }
 847
 848 MODULE_AUTHOR("Cluster File Systems, Inc. <braam@clusterfs.com>");
 849 MODULE_DESCRIPTION("Lustre Class Driver v1.0");
 850 MODULE_LICENSE("GPL");
 851
 852 module_init(init_obdclass);
 853 module_exit(cleanup_obdclass);