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_MODULE_DEBUG:
 380         {
 381                 struct module *mod = module_list;
 382                 char *tmp = data->ioc_inlbuf1;
 383                 char line[128];
 384
 385                 snprintf(line, 128, "symbol-file\n"
 386                          "symbol-file /usr/src/lum/linux\n"
 387                          "b panic\n"
 388                          "b stop\n");
 389                 tmp += strlen(line);
 390
 391                 do {
 392                         sprintf(line,
 393                                 "add-symbol-file /usr/src/obd/%s/%s.o %p\n",
 394                                 mod->name, mod->name, mod);
 395                         memcpy(tmp, line, strlen(line));
 396                         tmp += strlen(line);
 397                 } while ( mod->next != NULL)
 398
 399                 return copy_to_user((int *)arg, data, sizeof(*data) +
 400                                     data->ioc_inllen1);
 401         }
 402
 403         case OBD_IOC_SYNC: {
 404                 struct oic_range_s *range = tmp_buf;
 405
 406                 if (!obd->obd_type)
 407                         return -ENODEV;
 408
 409                 err = copy_from_user(range, (const void *)arg,  sizeof(*range));
 410
 411                 if ( err ) {
 412                         EXIT;
 413                         return err;
 414                 }
 415
 416                 if ( !OBT(obd) || !OBP(obd, sync) ) {
 417                         err = -EOPNOTSUPP;
 418                         EXIT;
 419                         return err;
 420                 }
 421
 422                 /* XXX sync needs to be tested/verified */
 423                 err = OBP(obd, sync)(&conn, &range->obdo, range->count,
 424                                         range->offset);
 425
 426                 if ( err ) {
 427                         EXIT;
 428                         return err;
 429                 }
 430
 431                 return put_user(err, (int *) arg);
 432         }
 433
 434         case OBD_IOC_READ: {
 435                 int err;
 436                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 437
 438                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 439                 if ( err ) {
 440                         EXIT;
 441                         return err;
 442                 }
 443
 444                 conn.oc_id = rw_s->conn_id;
 445
 446                 if ( !OBT(obd) || !OBP(obd, read) ) {
 447                         err = -EOPNOTSUPP;
 448                         EXIT;
 449                         return err;
 450                 }
 451
 452
 453                 err = OBP(obd, read)(&conn, &rw_s->obdo, rw_s->buf,
 454                                         &rw_s->count, rw_s->offset);
 455
 456                 ODEBUG(&rw_s->obdo);
 457                 CDEBUG(D_INFO, "READ: conn %d, count %Ld, offset %Ld, '%s'\n",
 458                        rw_s->conn_id, rw_s->count, rw_s->offset, rw_s->buf);
 459                 if ( err ) {
 460                         EXIT;
 461                         return err;
 462                 }
 463
 464                 err = copy_to_user((int*)arg, &rw_s->count, sizeof(rw_s->count));
 465                 EXIT;
 466                 return err;
 467         }
 468
 469         case OBD_IOC_WRITE: {
 470                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 471
 472                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 473                 if ( err ) {
 474                         EXIT;
 475                         return err;
 476                 }
 477
 478                 conn.oc_id = rw_s->conn_id;
 479
 480                 if ( !OBT(obd) || !OBP(obd, write) ) {
 481                         err = -EOPNOTSUPP;
 482                         return err;
 483                 }
 484
 485                 CDEBUG(D_INFO, "WRITE: conn %d, count %Ld, offset %Ld, '%s'\n",
 486                        rw_s->conn_id, rw_s->count, rw_s->offset, rw_s->buf);
 487
 488                 err = OBP(obd, write)(&conn, &rw_s->obdo, rw_s->buf,
 489                                          &rw_s->count, rw_s->offset);
 490                 ODEBUG(&rw_s->obdo);
 491                 if ( err ) {
 492                         EXIT;
 493                         return err;
 494                 }
 495
 496                 err = copy_to_user((int *)arg, &rw_s->count,
 497                                    sizeof(rw_s->count));
 498                 EXIT;
 499                 return err;
 500         }
 501         case OBD_IOC_PREALLOCATE: {
 502                 struct oic_prealloc_s *prealloc = tmp_buf;
 503
 504                 /* has this minor been registered? */
 505                 if (!obd->obd_type)
 506                         return -ENODEV;
 507
 508                 err = copy_from_user(prealloc, (int *)arg, sizeof(*prealloc));
 509                 if (err)
 510                         return -EFAULT;
 511
 512                 if ( !(obd->obd_flags & OBD_ATTACHED) ||
 513                      !(obd->obd_flags & OBD_SET_UP)) {
 514                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 515                         return -ENODEV;
 516                 }
 517
 518                 if ( !OBT(obd) || !OBP(obd, preallocate) )
 519                         return -EOPNOTSUPP;
 520
 521                 conn.oc_id = prealloc->conn_id;
 522                 err = OBP(obd, preallocate)(&conn, &prealloc->alloc,
 523                                                prealloc->ids);
 524                 if ( err ) {
 525                         EXIT;
 526                         return err;
 527                 }
 528
 529                 err =copy_to_user((int *)arg, prealloc, sizeof(*prealloc));
 530                 EXIT;
 531                 return err;
 532         }
 533         case OBD_IOC_STATFS: {
 534                 struct statfs *tmp;
 535                 unsigned int conn_id;
 536                 struct statfs buf;
 537
 538                 /* has this minor been registered? */
 539                 if (!obd->obd_type)
 540                         return -ENODEV;
 541
 542                 tmp = (void *)arg + sizeof(unsigned int);
 543                 get_user(conn_id, (int *) arg);
 544
 545                 if ( !OBT(obd) || !OBP(obd, statfs) )
 546                         return -EOPNOTSUPP;
 547
 548                 conn.oc_id = conn_id;
 549                 err = OBP(obd, statfs)(&conn, &buf);
 550                 if ( err ) {
 551                         EXIT;
 552                         return err;
 553                 }
 554                 err = copy_to_user(tmp, &buf, sizeof(buf));
 555                 EXIT;
 556                 return err;
 557
 558         }
 559         case OBD_IOC_COPY: {
 560                 struct ioc_mv_s *mvdata = tmp_buf;
 561
 562                 if ( (!(obd->obd_flags & OBD_SET_UP)) ||
 563                      (!(obd->obd_flags & OBD_ATTACHED))) {
 564                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 565                         return -ENODEV;
 566                 }
 567
 568                 /* get main structure */
 569                 err = copy_from_user(mvdata, (void *) arg, sizeof(*mvdata));
 570                 if (err) {
 571                         EXIT;
 572                         return err;
 573                 }
 574
 575                 if ( !OBT(obd) || !OBP(obd, copy) )
 576                         return -EOPNOTSUPP;
 577
 578                 /* do the partition */
 579                 CDEBUG(D_INFO, "Copy %d, type %s dst %Ld src %Ld\n", dev,
 580                        obd->obd_type->typ_name, mvdata->dst.o_id,
 581                        mvdata->src.o_id);
 582
 583                 conn.oc_id = mvdata->src_conn_id;
 584
 585                 err = OBP(obd, copy)(&conn, &mvdata->dst,
 586                                         &conn, &mvdata->src,
 587                                         mvdata->src.o_size, 0);
 588                 return err;
 589         }
 590
 591         case OBD_IOC_MIGR: {
 592                 struct ioc_mv_s *mvdata = tmp_buf;
 593
 594                 if ( (!(obd->obd_flags & OBD_SET_UP)) ||
 595                      (!(obd->obd_flags & OBD_ATTACHED))) {
 596                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 597                         return -ENODEV;
 598                 }
 599
 600                 err = copy_from_user(mvdata, (void *) arg, sizeof(*mvdata));
 601                 if (err) {
 602                         EXIT;
 603                         return err;
 604                 }
 605
 606                 CDEBUG(D_INFO, "Migrate copying %d bytes\n", sizeof(*mvdata));
 607
 608                 if ( !OBT(obd) || !OBP(obd, migrate) )
 609                         return -EOPNOTSUPP;
 610
 611                 /* do the partition */
 612                 CDEBUG(D_INFO, "Migrate %d, type %s conn %d src %Ld dst %Ld\n",
 613                        dev, obd->obd_type->typ_name, mvdata->src_conn_id,
 614                        mvdata->src.o_id, mvdata->dst.o_id);
 615
 616                 conn.oc_id = mvdata->src_conn_id;
 617                 err = OBP(obd, migrate)(&conn, &mvdata->dst, &mvdata->src,
 618                                            mvdata->src.o_size, 0);
 619
 620                 return err;
 621         }
 622         case OBD_IOC_PUNCH: {
 623                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 624
 625                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 626                 if ( err ) {
 627                         EXIT;
 628                         return err;
 629                 }
 630
 631                 conn.oc_id = rw_s->conn_id;
 632
 633                 if ( !OBT(obd) || !OBP(obd, punch) ) {
 634                         err = -EOPNOTSUPP;
 635                         return err;
 636                 }
 637
 638                 CDEBUG(D_INFO, "PUNCH: conn %d, count %Ld, offset %Ld\n",
 639                        rw_s->conn_id, rw_s->count, rw_s->offset);
 640                 err = OBP(obd, punch)(&conn, &rw_s->obdo, rw_s->count,
 641                                          rw_s->offset);
 642                 ODEBUG(&rw_s->obdo);
 643                 if ( err ) {
 644                         EXIT;
 645                         return err;
 646                 }
 647                 EXIT;
 648                 return err;
 649         }
 650
 651         default: {
 652                 struct obd_type *type;
 653                 struct oic_generic input;
 654                 char *nm;
 655                 void *karg;
 656
 657                 /* get data structures */
 658                 err = copy_from_user(&input, (void *)arg, sizeof(input));
 659                 if ( err ) {
 660                         EXIT;
 661                         return err;
 662                 }
 663
 664                 err = getdata(input.att_typelen + 1, &input.att_type);
 665                 if ( err ) {
 666                         EXIT;
 667                         return err;
 668                 }
 669
 670                 /* find the type */
 671                 nm = input.att_type;
 672                 type = obd_nm_to_type(nm);
 673 #ifdef CONFIG_KMOD
 674                 if ( !type ) {
 675                         if ( !request_module(nm) ) {
 676                                 CDEBUG(D_PSDEV, "Loaded module '%s'\n", nm);
 677                                 type = obd_nm_to_type(nm);
 678                         } else {
 679                                 CDEBUG(D_PSDEV, "Can't load module '%s'\n", nm);
 680                         }
 681                 }
 682 #endif
 683                 OBD_FREE(input.att_type, input.att_typelen + 1);
 684                 if ( !type ) {
 685                         printk(__FUNCTION__ ": unknown obd type dev %d\n", dev);
 686                         EXIT;
 687                         return -EINVAL;
 688                 }
 689
 690                 if ( !type->typ_ops || !type->typ_ops->o_iocontrol ) {
 691                         EXIT;
 692                         return -EOPNOTSUPP;
 693                 }
 694                 conn.oc_id = input.att_connid;
 695
 696                 CDEBUG(D_INFO, "Calling ioctl %x for type %s, len %d\n",
 697                        cmd, type->typ_name, input.att_datalen);
 698
 699                 /* get the generic data */
 700                 karg = input.att_data;
 701                 err = getdata(input.att_datalen, &karg);
 702                 if ( err ) {
 703                         EXIT;
 704                         return err;
 705                 }
 706
 707                 err = type->typ_ops->o_iocontrol(cmd, &conn, input.att_datalen,
 708                                                  karg, input.att_data);
 709                 OBD_FREE(karg, input.att_datalen);
 710
 711                 EXIT;
 712                 return err;
 713         }
 714 #endif
 715         default:
 716                 return -EINVAL;
 717
 718         }
 719 } /* obd_class_ioctl */
 720
 721
 722 /* Driver interface done, utility functions follow */
 723 int obd_register_type(struct obd_ops *ops, char *nm)
 724 {
 725         struct obd_type *type;
 726
 727         if (obd_init_magic != 0x11223344) {
 728                 printk(__FUNCTION__ ": bad magic for type\n");
 729                 EXIT;
 730                 return -EINVAL;
 731         }
 732
 733         if  ( obd_nm_to_type(nm) ) {
 734                 CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
 735                 EXIT;
 736                 return -EEXIST;
 737         }
 738
 739         OBD_ALLOC(type, sizeof(*type));
 740         if ( !type ) {
 741                 EXIT;
 742                 return -ENOMEM;
 743         }
 744         memset(type, 0, sizeof(*type));
 745         INIT_LIST_HEAD(&type->typ_chain);
 746         MOD_INC_USE_COUNT;
 747         list_add(&type->typ_chain, obd_types.next);
 748         type->typ_ops = ops;
 749         type->typ_name = nm;
 750         EXIT;
 751         return 0;
 752 }
 753
 754 int obd_unregister_type(char *nm)
 755 {
 756         struct obd_type *type = obd_nm_to_type(nm);
 757
 758         if ( !type ) {
 759                 MOD_DEC_USE_COUNT;
 760                 printk(KERN_INFO __FUNCTION__ ": unknown obd type\n");
 761                 EXIT;
 762                 return -EINVAL;
 763         }
 764
 765         if ( type->typ_refcnt ) {
 766                 MOD_DEC_USE_COUNT;
 767                 printk(KERN_ALERT __FUNCTION__ ":type %s has refcount "
 768                        "(%d)\n", nm, type->typ_refcnt);
 769                 EXIT;
 770                 return -EBUSY;
 771         }
 772
 773         list_del(&type->typ_chain);
 774         OBD_FREE(type, sizeof(*type));
 775         MOD_DEC_USE_COUNT;
 776         return 0;
 777 } /* obd_unregister_type */
 778
 779 /* declare character device */
 780 static struct file_operations obd_psdev_fops = {
 781         ioctl: obd_class_ioctl,       /* ioctl */
 782         open: obd_class_open,        /* open */
 783         release: obd_class_release,     /* release */
 784 };
 785
 786 /* modules setup */
 787 #define OBD_MINOR 241
 788 static struct miscdevice obd_psdev = {
 789         OBD_MINOR,
 790         "obd_psdev",
 791         &obd_psdev_fops
 792 };
 793
 794 int init_obd(void)
 795 {
 796         int err;
 797         int i;
 798
 799         printk(KERN_INFO "OBD class driver  v0.01, braam@stelias.com\n");
 800
 801         INIT_LIST_HEAD(&obd_types);
 802
 803         if ( (err = misc_register(&obd_psdev)) ) {
 804                 printk(KERN_ERR __FUNCTION__ ": cannot register %d err %d\n",
 805                        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         }
 814
 815         err = obd_init_obdo_cache();
 816         if (err)
 817                 return err;
 818         obd_sysctl_init();
 819         obd_init_magic = 0x11223344;
 820         return 0;
 821 }
 822
 823 EXPORT_SYMBOL(obd_register_type);
 824 EXPORT_SYMBOL(obd_unregister_type);
 825
 826 EXPORT_SYMBOL(obd_print_entry);
 827 EXPORT_SYMBOL(obd_debug_level);
 828 EXPORT_SYMBOL(obd_dev);
 829
 830 EXPORT_SYMBOL(gen_connect);
 831 EXPORT_SYMBOL(gen_client);
 832 EXPORT_SYMBOL(gen_cleanup);
 833 EXPORT_SYMBOL(gen_disconnect);
 834 EXPORT_SYMBOL(gen_copy_data);
 835 EXPORT_SYMBOL(obdo_cachep);
 836
 837 /* EXPORT_SYMBOL(gen_multi_attach); */
 838 EXPORT_SYMBOL(gen_multi_setup);
 839 EXPORT_SYMBOL(gen_multi_cleanup);
 840 EXPORT_SYMBOL(obd_memory);
 841
 842 #ifdef MODULE
 843 int init_module(void)
 844 {
 845         return init_obd();
 846 }
 847
 848 void cleanup_module(void)
 849 {
 850         int i;
 851         ENTRY;
 852
 853         misc_deregister(&obd_psdev);
 854         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 855                 struct obd_device *obd = &obd_dev[i];
 856                 if ( obd->obd_type &&
 857                      (obd->obd_flags & OBD_SET_UP) &&
 858                      OBT(obd) && OBP(obd, detach) ) {
 859                         /* XXX should this call generic detach otherwise? */
 860                         OBP(obd, detach)(obd);
 861                 }
 862         }
 863
 864         obd_cleanup_obdo_cache();
 865         obd_sysctl_clean();
 866         CDEBUG(D_MALLOC, "CLASS mem used %ld\n", obd_memory);
 867         obd_init_magic = 0;
 868         EXIT;
 869 }
 870 #endif