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