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  *              as published by the Free Software Foundation; either version
  10  *              2 of the License, or (at your option) any later version.
  11  *
  12  *              Adapted to become the Linux 2.0 Coda pseudo device
  13  *              Peter  Braam  <braam@maths.ox.ac.uk>
  14  *              Michael Callahan <mjc@emmy.smith.edu>
  15  *
  16  *              Changes for Linux 2.1
  17  *              Copyright (c) 1997 Carnegie-Mellon University
  18  *
  19  *              Redone again for Intermezzo
  20  *              Copyright (c) 1998 Peter J. Braam
  21  *
  22  *              Hacked up again for simulated OBD
  23  *              Copyright (c) 1999 Stelias Computing, Inc.
  24  *                (authors {pschwan,braam}@stelias.com)
  25  *              Copyright (C) 1999 Seagate Technology, Inc.
  26  *
  27  *
  28  */
  29
  30 #define EXPORT_SYMTAB
  31
  32 #include <linux/config.h> /* for CONFIG_PROC_FS */
  33 #include <linux/module.h>
  34 #include <linux/errno.h>
  35 #include <linux/kernel.h>
  36 #include <linux/major.h>
  37 #include <linux/sched.h>
  38 #include <linux/lp.h>
  39 #include <linux/malloc.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/segment.h>
  52 #include <asm/system.h>
  53 #include <asm/poll.h>
  54 #include <asm/uaccess.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 = 4095;
  62 struct obd_device obd_dev[MAX_OBD_DEVICES];
  63 struct list_head obd_types;
  64
  65 /* called when opening /dev/obdNNN */
  66 static int obd_class_open(struct inode * inode, struct file * file)
  67 {
  68         int dev;
  69         ENTRY;
  70
  71         if (!inode)
  72                 return -EINVAL;
  73         dev = MINOR(inode->i_rdev);
  74         if (dev >= MAX_OBD_DEVICES)
  75                 return -ENODEV;
  76         obd_dev[dev].obd_refcnt++;
  77         CDEBUG(D_PSDEV, "Dev %d refcount now %d\n", dev,
  78                obd_dev[dev].obd_refcnt);
  79
  80         MOD_INC_USE_COUNT;
  81         EXIT;
  82         return 0;
  83 }
  84
  85 /* called when closing /dev/obdNNN */
  86 static int obd_class_release(struct inode * inode, struct file * file)
  87 {
  88         int dev;
  89         ENTRY;
  90
  91         if (!inode)
  92                 return -EINVAL;
  93         dev = MINOR(inode->i_rdev);
  94         if (dev >= MAX_OBD_DEVICES)
  95                 return -ENODEV;
  96         fsync_dev(inode->i_rdev);
  97         if (obd_dev[dev].obd_refcnt <= 0)
  98                 printk(KERN_ALERT "obd_class_release: refcount(%d) <= 0\n",
  99                        obd_dev[dev].obd_refcnt);
 100         obd_dev[dev].obd_refcnt--;
 101
 102         CDEBUG(D_PSDEV, "Dev %d refcount now %d\n", dev,
 103                obd_dev[dev].obd_refcnt);
 104         MOD_DEC_USE_COUNT;
 105
 106         EXIT;
 107         return 0;
 108 }
 109
 110 /* support function */
 111 static struct obd_type *obd_nm_to_type(char *nm)
 112 {
 113         struct list_head *tmp;
 114         struct obd_type *type;
 115         CDEBUG(D_IOCTL, "SEARCH %s\n", nm);
 116
 117         tmp = &obd_types;
 118         while ( (tmp = tmp->next) != &obd_types ) {
 119                 type = list_entry(tmp, struct obd_type, typ_chain);
 120                 CDEBUG(D_IOCTL, "TYP %s\n", type->typ_name);
 121                 if (strlen(type->typ_name) == strlen(nm) &&
 122                     strcmp(type->typ_name, nm) == 0 ) {
 123                         return type;
 124                 }
 125         }
 126         return NULL;
 127 }
 128
 129
 130 static int getdata(int len, void **data)
 131 {
 132         void *tmp = NULL;
 133
 134         if (!len)
 135                 return 0;
 136
 137         CDEBUG(D_IOCTL, "getdata: len %d, add %p\n", len, *data);
 138
 139         OBD_ALLOC(tmp, void *, len);
 140         if ( !tmp )
 141                 return -ENOMEM;
 142
 143         memset(tmp, 0, len);
 144         if ( copy_from_user(tmp, *data, len)) {
 145                 OBD_FREE(tmp,len);
 146                 return -EFAULT;
 147         }
 148         *data = tmp;
 149
 150         return 0;
 151 }
 152
 153 /* to control /dev/obdNNN */
 154 static int obd_class_ioctl (struct inode * inode, struct file * filp,
 155                             unsigned int cmd, unsigned long arg)
 156 {
 157         struct obd_device *obddev;
 158         /* NOTE this must be larger than any of the ioctl data structs */
 159         char buff[1024];
 160         void *karg = buff;
 161         struct obd_conn conn;
 162         int err, dev;
 163         long int cli_id; /* connect, disconnect */
 164
 165         if (!inode)
 166                 return -EINVAL;
 167
 168         dev = MINOR(inode->i_rdev);
 169         if (dev > MAX_OBD_DEVICES)
 170                 return -ENODEV;
 171         obddev = &obd_dev[dev];
 172         conn.oc_dev = obddev;
 173
 174         switch (cmd) {
 175         case TCGETS:
 176                 return -EINVAL;
 177         case OBD_IOC_ATTACH: {
 178                 struct obd_type *type;
 179                 struct oic_generic *input = karg;
 180
 181                 ENTRY;
 182                 /* have we attached a type to this device */
 183                 if ( obddev->obd_type ||
 184                      (obddev->obd_flags & OBD_ATTACHED) ){
 185                         CDEBUG(D_IOCTL,
 186                                "OBD Device %d already attached to type %s.\n",
 187                                dev, obddev->obd_type->typ_name);
 188                         EXIT;
 189                         return -EBUSY;
 190                 }
 191
 192                 /* get data structures */
 193                 err = copy_from_user(input, (void *)arg, sizeof(*input));
 194                 if ( err ) {
 195                         EXIT;
 196                         return err;
 197                 }
 198
 199                 err = getdata(input->att_typelen + 1, &input->att_type);
 200                 if ( err ) {
 201                         EXIT;
 202                         return err;
 203                 }
 204
 205                 /* find the type */
 206                 type = obd_nm_to_type(input->att_type);
 207                 OBD_FREE(input->att_type, input->att_typelen + 1);
 208                 if ( !type ) {
 209                         printk("Unknown obd type dev %d\n", dev);
 210                         EXIT;
 211                         return -EINVAL;
 212                 }
 213                 obddev->obd_type = type;
 214
 215                 /* get the attach data */
 216                 err = getdata(input->att_datalen, &input->att_data);
 217                 if ( err ) {
 218                         EXIT;
 219                         return err;
 220                 }
 221
 222                 INIT_LIST_HEAD(&obddev->obd_gen_clients);
 223                 obddev->obd_multi_count = 0;
 224
 225                 CDEBUG(D_IOCTL, "Attach %d, datalen %d, type %s\n",
 226                        dev, input->att_datalen, obddev->obd_type->typ_name);
 227                 /* maybe we are done */
 228                 if ( !OBT(obddev) || !OBP(obddev, attach) ) {
 229                         obddev->obd_flags |=  OBD_ATTACHED;
 230                         type->typ_refcnt++;
 231                         CDEBUG(D_IOCTL, "Dev %d refcount now %d\n", dev,
 232                                type->typ_refcnt);
 233                         MOD_INC_USE_COUNT;
 234                         EXIT;
 235                         return 0;
 236                 }
 237
 238                 /* do the attach */
 239                 err = OBP(obddev, attach)(obddev, input->att_datalen,
 240                                           input->att_data);
 241                 OBD_FREE(input->att_data, input->att_datalen);
 242
 243                 if ( err ) {
 244                         obddev->obd_flags &= ~OBD_ATTACHED;
 245                         obddev->obd_type = NULL;
 246                         EXIT;
 247                 } else {
 248                         obddev->obd_flags |=  OBD_ATTACHED;
 249                         type->typ_refcnt++;
 250                         CDEBUG(D_IOCTL, "Dev %d refcount now %d\n", dev,
 251                                type->typ_refcnt);
 252                         MOD_INC_USE_COUNT;
 253                         EXIT;
 254                 }
 255                 return err;
 256         }
 257
 258         case OBD_IOC_DETACH: {
 259
 260                 ENTRY;
 261                 if (obddev->obd_flags & OBD_SET_UP) {
 262                         EXIT;
 263                         return -EBUSY;
 264                 }
 265                 if (! (obddev->obd_flags & OBD_ATTACHED) ) {
 266                         CDEBUG(D_IOCTL, "Device not attached\n");
 267                         EXIT;
 268                         return -ENODEV;
 269                 }
 270                 if ( !list_empty(&obddev->obd_gen_clients) ) {
 271                         CDEBUG(D_IOCTL, "Device has connected clients\n");
 272                         EXIT;
 273                         return -EBUSY;
 274                 }
 275
 276                 CDEBUG(D_IOCTL, "Detach %d, type %s\n", dev,
 277                        obddev->obd_type->typ_name);
 278                 obddev->obd_flags &= ~OBD_ATTACHED;
 279                 obddev->obd_type->typ_refcnt--;
 280                 CDEBUG(D_IOCTL, "Dev %d refcount now %d\n", dev,
 281                        obddev->obd_type->typ_refcnt);
 282                 obddev->obd_type = NULL;
 283                 MOD_DEC_USE_COUNT;
 284                 EXIT;
 285                 return 0;
 286         }
 287
 288         case OBD_IOC_SETUP: {
 289                 struct ioc_setup {
 290                         int setup_datalen;
 291                         void *setup_data;
 292                 } *setup;
 293                 setup = karg;
 294
 295                 ENTRY;
 296                 /* have we attached a type to this device */
 297                 if (!(obddev->obd_flags & OBD_ATTACHED)) {
 298                         CDEBUG(D_IOCTL, "Device not attached\n");
 299                         EXIT;
 300                         return -ENODEV;
 301                 }
 302
 303                 /* has this been done already? */
 304                 if ( obddev->obd_flags & OBD_SET_UP ) {
 305                         CDEBUG(D_IOCTL, "Device %d already setup (type %s)\n",
 306                                dev, obddev->obd_type->typ_name);
 307                         EXIT;
 308                         return -EBUSY;
 309                 }
 310
 311                 /* get main structure */
 312                 err = copy_from_user(setup, (void *) arg, sizeof(*setup));
 313                 if (err) {
 314                         EXIT;
 315                         return err;
 316                 }
 317
 318                 err = getdata(setup->setup_datalen, &setup->setup_data);
 319                 if (err) {
 320                         EXIT;
 321                         return err;
 322                 }
 323
 324                 /* do the setup */
 325                 CDEBUG(D_IOCTL, "Setup %d, type %s\n", dev,
 326                        obddev->obd_type->typ_name);
 327                 if ( !OBT(obddev) || !OBP(obddev, setup) ) {
 328                         obddev->obd_type->typ_refcnt++;
 329                         CDEBUG(D_IOCTL, "Dev %d refcount now %d\n",
 330                                dev, obddev->obd_type->typ_refcnt);
 331                         obddev->obd_flags |= OBD_SET_UP;
 332                         EXIT;
 333                         return 0;
 334                 }
 335
 336                 err = OBP(obddev, setup)(obddev, setup->setup_datalen,
 337                                          setup->setup_data);
 338
 339                 if ( err )  {
 340                         obddev->obd_flags &= ~OBD_SET_UP;
 341                         EXIT;
 342                 } else {
 343                         obddev->obd_type->typ_refcnt++;
 344                         CDEBUG(D_IOCTL, "Dev %d refcount now %d\n",
 345                                dev, obddev->obd_type->typ_refcnt);
 346                         obddev->obd_flags |= OBD_SET_UP;
 347                         EXIT;
 348                 }
 349                 return err;
 350         }
 351         case OBD_IOC_CLEANUP: {
 352                 ENTRY;
 353                 /* has this minor been registered? */
 354                 if (!obddev->obd_type) {
 355                         CDEBUG(D_IOCTL, "OBD Device %d has no type.\n", dev);
 356                         EXIT;
 357                         return -ENODEV;
 358                 }
 359
 360                 if ( !obddev->obd_type->typ_refcnt ) {
 361                         printk("OBD_CLEANUP: Dev %d has refcount (%d)!\n",
 362                                dev, obddev->obd_type->typ_refcnt);
 363                         EXIT;
 364                         return -EBUSY;
 365                 }
 366
 367                 if ( (!(obddev->obd_flags & OBD_SET_UP)) ||
 368                      (!(obddev->obd_flags & OBD_ATTACHED))) {
 369                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 370                         EXIT;
 371                         return -ENODEV;
 372                 }
 373
 374                 if ( !OBT(obddev) || !OBP(obddev, cleanup) )
 375                         goto cleanup_out;
 376
 377                 /* cleanup has no argument */
 378                 err = OBP(obddev, cleanup)(obddev);
 379                 if ( err ) {
 380                         EXIT;
 381                         return err;
 382                 }
 383
 384         cleanup_out:
 385                 obddev->obd_flags &= ~OBD_SET_UP;
 386                 obddev->obd_type->typ_refcnt--;
 387                 CDEBUG(D_IOCTL, "Dev %d refcount now %d\n", dev,
 388                        obddev->obd_type->typ_refcnt);
 389                 EXIT;
 390                 return 0;
 391         }
 392         case OBD_IOC_CONNECT:
 393         {
 394                 if ( (!(obddev->obd_flags & OBD_SET_UP)) ||
 395                      (!(obddev->obd_flags & OBD_ATTACHED))) {
 396                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 397                         return -ENODEV;
 398                 }
 399
 400                 if ( !OBT(obddev) || !OBP(obddev, connect) )
 401                         return -EOPNOTSUPP;
 402
 403                 err = OBP(obddev, connect)(&conn);
 404                 if ( err )
 405                         return err;
 406
 407                 return copy_to_user((int *)arg, &conn.oc_id,
 408                                     sizeof(uint32_t));
 409         }
 410         case OBD_IOC_DISCONNECT:
 411                 /* frees data structures */
 412                 /* has this minor been registered? */
 413                 if (!obddev->obd_type)
 414                         return -ENODEV;
 415
 416                 get_user(cli_id, (int *) arg);
 417                 conn.oc_id = cli_id;
 418
 419                 if ( !OBT(obddev) || !OBP(obddev, disconnect))
 420                         return -EOPNOTSUPP;
 421
 422                 OBP(obddev, disconnect)(&conn);
 423                 return 0;
 424
 425                 /* XXX sync needs to be done */
 426         case OBD_IOC_SYNC: {
 427                 struct oic_range_s *range = karg;
 428
 429                 if (!obddev->obd_type)
 430                         return -ENODEV;
 431
 432                 err = copy_from_user(range, (const void *)arg,  sizeof(*range));
 433                 if (err) {
 434                         EXIT;
 435                         return err;
 436                 }
 437
 438                 return put_user(err, (int *) arg);
 439         }
 440         case OBD_IOC_CREATE: {
 441                 struct oic_attr_s *attr = karg;
 442
 443                 err = copy_from_user(attr, (const void *)arg,  sizeof(*attr));
 444                 if (err) {
 445                         EXIT;
 446                         return err;
 447                 }
 448
 449                 /* has this minor been registered? */
 450                 if ( !(obddev->obd_flags & OBD_ATTACHED) ||
 451                      !(obddev->obd_flags & OBD_SET_UP)) {
 452                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 453                         return -ENODEV;
 454                 }
 455                 conn.oc_id = attr->conn_id;
 456
 457                 if ( !OBT(obddev) || !OBP(obddev, create) )
 458                         return -EOPNOTSUPP;
 459
 460                 err = OBP(obddev, create)(&conn, &attr->obdo);
 461                 if (err) {
 462                         EXIT;
 463                         return err;
 464                 }
 465
 466                 err = copy_to_user((int *)arg, attr, sizeof(*attr));
 467                 EXIT;
 468                 return err;
 469         }
 470
 471         case OBD_IOC_DESTROY: {
 472                 struct oic_attr_s *attr = karg;
 473
 474                 /* has this minor been registered? */
 475                 if (!obddev->obd_type)
 476                         return -ENODEV;
 477
 478                 err = copy_from_user(attr, (int *)arg, sizeof(*attr));
 479                 if ( err ) {
 480                         EXIT;
 481                         return err;
 482                 }
 483
 484                 if ( !OBT(obddev) || !OBP(obddev, destroy) )
 485                         return -EOPNOTSUPP;
 486
 487                 conn.oc_id = attr->conn_id;
 488                 err = OBP(obddev, destroy)(&conn, &attr->obdo);
 489                 EXIT;
 490                 return err;
 491         }
 492
 493         case OBD_IOC_SETATTR: {
 494                 struct oic_attr_s *attr = karg;
 495
 496                 /* has this minor been registered? */
 497                 if (!obddev->obd_type)
 498                         return -ENODEV;
 499
 500                 err = copy_from_user(attr, (int *)arg, sizeof(*attr));
 501                 if (err)
 502                         return err;
 503
 504                 if ( !OBT(obddev) || !OBP(obddev, setattr) )
 505                         return -EOPNOTSUPP;
 506
 507                 conn.oc_id = attr->conn_id;
 508                 err = OBP(obddev, setattr)(&conn, &attr->obdo);
 509                 EXIT;
 510                 return err;
 511         }
 512
 513         case OBD_IOC_GETATTR: {
 514                 struct oic_attr_s *attr = karg;
 515
 516                 err = copy_from_user(attr, (int *)arg, sizeof(*attr));
 517                 if (err)
 518                         return err;
 519
 520                 conn.oc_id = attr->conn_id;
 521                 err = OBP(obddev, getattr)(&conn, &attr->obdo);
 522                 if ( err ) {
 523                         EXIT;
 524                         return err;
 525                 }
 526
 527                 err = copy_to_user((int *)arg, attr, sizeof(*attr));
 528                 EXIT;
 529                 return err;
 530         }
 531
 532         case OBD_IOC_READ: {
 533                 int err;
 534                 struct oic_rw_s *rw_s = karg;  /* read, write ioctl str */
 535
 536                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 537                 if ( err ) {
 538                         EXIT;
 539                         return err;
 540                 }
 541
 542                 conn.oc_id = rw_s->conn_id;
 543
 544                 if ( !OBT(obddev) || !OBP(obddev, read) ) {
 545                         err = -EOPNOTSUPP;
 546                         EXIT;
 547                         return err;
 548                 }
 549
 550                 err = OBP(obddev, read)(&conn, &rw_s->obdo, rw_s->buf,
 551                                         &rw_s->count, rw_s->offset);
 552                 if ( err ) {
 553                         EXIT;
 554                         return err;
 555                 }
 556
 557                 err = copy_to_user((int*)arg, &rw_s->count, sizeof(rw_s->count));
 558                 EXIT;
 559                 return err;
 560         }
 561
 562         case OBD_IOC_WRITE: {
 563                 struct oic_rw_s *rw_s = karg;  /* read, write ioctl str */
 564
 565                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 566                 if ( err ) {
 567                         EXIT;
 568                         return err;
 569                 }
 570
 571                 conn.oc_id = rw_s->conn_id;
 572
 573                 if ( !OBT(obddev) || !OBP(obddev, write) ) {
 574                         err = -EOPNOTSUPP;
 575                         return err;
 576                 }
 577
 578                 err = OBP(obddev, write)(&conn, &rw_s->obdo, rw_s->buf,
 579                                          &rw_s->count, rw_s->offset);
 580                 if ( err ) {
 581                         EXIT;
 582                         return err;
 583                 }
 584
 585                 err = copy_to_user((int*)arg, &rw_s->count, sizeof(rw_s->count));
 586                 EXIT;
 587                 return err;
 588         }
 589         case OBD_IOC_PREALLOCATE: {
 590                 struct oic_prealloc_s *prealloc = karg;
 591
 592                 /* has this minor been registered? */
 593                 if (!obddev->obd_type)
 594                         return -ENODEV;
 595
 596                 err = copy_from_user(prealloc, (int *)arg, sizeof(*prealloc));
 597                 if (err)
 598                         return -EFAULT;
 599
 600                 if ( !(obddev->obd_flags & OBD_ATTACHED) ||
 601                      !(obddev->obd_flags & OBD_SET_UP)) {
 602                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 603                         return -ENODEV;
 604                 }
 605
 606                 if ( !OBT(obddev) || !OBP(obddev, preallocate) )
 607                         return -EOPNOTSUPP;
 608
 609                 conn.oc_id = prealloc->cli_id;
 610                 err = OBP(obddev, preallocate)(&conn, &prealloc->alloc,
 611                                                prealloc->ids);
 612                 if ( err ) {
 613                         EXIT;
 614                         return err;
 615                 }
 616
 617                 err =copy_to_user((int *)arg, prealloc, sizeof(*prealloc));
 618                 EXIT;
 619                 return err;
 620         }
 621         case OBD_IOC_STATFS: {
 622                 struct statfs *tmp;
 623                 unsigned int conn_id;
 624                 struct statfs buf;
 625
 626                 /* has this minor been registered? */
 627                 if (!obddev->obd_type)
 628                         return -ENODEV;
 629
 630                 tmp = (void *)arg + sizeof(unsigned int);
 631                 get_user(conn_id, (int *) arg);
 632
 633                 if ( !OBT(obddev) || !OBP(obddev, statfs) )
 634                         return -EOPNOTSUPP;
 635
 636                 conn.oc_id = conn_id;
 637                 err = OBP(obddev, statfs)(&conn, &buf);
 638                 if ( err ) {
 639                         EXIT;
 640                         return err;
 641                 }
 642                 err = copy_to_user(tmp, &buf, sizeof(buf));
 643                 EXIT;
 644                 return err;
 645
 646         }
 647         case OBD_IOC_COPY: {
 648                 struct ioc_mv_s *mvdata = karg;
 649
 650                 if ( (!(obddev->obd_flags & OBD_SET_UP)) ||
 651                      (!(obddev->obd_flags & OBD_ATTACHED))) {
 652                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 653                         return -ENODEV;
 654                 }
 655
 656                 /* get main structure */
 657                 err = copy_from_user(mvdata, (void *) arg, sizeof(*mvdata));
 658                 if (err) {
 659                         EXIT;
 660                         return err;
 661                 }
 662
 663                 if ( !OBT(obddev) || !OBP(obddev, copy) )
 664                         return -EOPNOTSUPP;
 665
 666                 /* do the partition */
 667                 CDEBUG(D_IOCTL, "Copy %d, type %s dst %Ld src %Ld\n", dev,
 668                        obddev->obd_type->typ_name, mvdata->dst.o_id,
 669                        mvdata->src.o_id);
 670
 671                 conn.oc_id = mvdata->src_conn_id;
 672
 673                 err = OBP(obddev, copy)(&conn, &mvdata->dst,
 674                                         &conn, &mvdata->src,
 675                                         mvdata->src.o_size, 0);
 676                 return err;
 677         }
 678
 679         case OBD_IOC_MIGR: {
 680                 struct ioc_mv_s *mvdata = karg;
 681
 682                 if ( (!(obddev->obd_flags & OBD_SET_UP)) ||
 683                      (!(obddev->obd_flags & OBD_ATTACHED))) {
 684                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 685                         return -ENODEV;
 686                 }
 687
 688                 err = copy_from_user(mvdata, (void *) arg, sizeof(*mvdata));
 689                 if (err) {
 690                         EXIT;
 691                         return err;
 692                 }
 693
 694                 CDEBUG(D_IOCTL, "Migrate copying %d\n", sizeof(*mvdata));
 695
 696                 if ( !OBT(obddev) || !OBP(obddev, migrate) )
 697                         return -EOPNOTSUPP;
 698
 699                 /* do the partition */
 700                 CDEBUG(D_IOCTL, "Migrate %d, type %s conn %d src %Ld dst %Ld\n",
 701                        dev, obddev->obd_type->typ_name, mvdata->src_conn_id,
 702                        mvdata->src.o_id, mvdata->dst.o_id);
 703
 704                 conn.oc_id = mvdata->src_conn_id;
 705                 err = OBP(obddev, migrate)(&conn, &mvdata->dst, &mvdata->src,
 706                                            mvdata->dst.o_size, 0);
 707
 708                 return err;
 709         }
 710
 711         default: {
 712                 struct obd_type *type;
 713                 struct oic_generic input;
 714                 void *karg;
 715
 716                 /* get data structures */
 717                 err = copy_from_user(&input, (void *)arg, sizeof(input));
 718                 if ( err ) {
 719                         EXIT;
 720                         return err;
 721                 }
 722
 723                 err = getdata(input.att_typelen + 1, &input.att_type);
 724                 if ( err ) {
 725                         EXIT;
 726                         return err;
 727                 }
 728
 729                 /* find the type */
 730                 type = obd_nm_to_type(input.att_type);
 731                 OBD_FREE(input.att_type, input.att_typelen + 1);
 732                 if ( !type ) {
 733                         printk("Unknown obd type dev %d\n", dev);
 734                         EXIT;
 735                         return -EINVAL;
 736                 }
 737
 738                 if ( !type->typ_ops || !type->typ_ops->o_iocontrol ) {
 739                         EXIT;
 740                         return -EOPNOTSUPP;
 741                 }
 742                 conn.oc_id = input.att_connid;
 743
 744                 CDEBUG(D_IOCTL, "Calling ioctl %x for type %s, len %d\n",
 745                        cmd, type->typ_name, input.att_datalen);
 746
 747                 /* get the generic data */
 748                 karg = input.att_data;
 749                 err = getdata(input.att_datalen, karg);
 750                 if ( err ) {
 751                         EXIT;
 752                         return err;
 753                 }
 754
 755                 err = type->typ_ops->o_iocontrol(cmd, &conn, input.att_datalen,
 756                                                  karg, input.att_data);
 757                 OBD_FREE(karg, input.att_datalen);
 758
 759                 EXIT;
 760                 return err;
 761         }
 762         }
 763 }
 764
 765 /* Driver interface done, utility functions follow */
 766
 767 int obd_register_type(struct obd_ops *ops, char *nm)
 768 {
 769         struct obd_type *type;
 770
 771
 772         if (obd_init_magic != 0x11223344) {
 773                 EXIT;
 774                 return -EINVAL;
 775         }
 776
 777         if  ( obd_nm_to_type(nm) ) {
 778                 CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
 779                 EXIT;
 780                 return -EEXIST;
 781         }
 782
 783         OBD_ALLOC(type, struct obd_type * , sizeof(*type));
 784         if ( !type ) {
 785                 EXIT;
 786                 return -ENOMEM;
 787         }
 788         memset(type, 0, sizeof(*type));
 789         INIT_LIST_HEAD(&type->typ_chain);
 790         MOD_INC_USE_COUNT;
 791         list_add(&type->typ_chain, obd_types.next);
 792         type->typ_ops = ops;
 793         type->typ_name = nm;
 794         EXIT;
 795         return 0;
 796 }
 797
 798 int obd_unregister_type(char *nm)
 799 {
 800         struct obd_type *type = obd_nm_to_type(nm);
 801
 802         if ( !type ) {
 803                 MOD_DEC_USE_COUNT;
 804                 printk("Unknown obd type\n");
 805                 EXIT;
 806                 return -EINVAL;
 807         }
 808
 809         if ( type->typ_refcnt ) {
 810                 MOD_DEC_USE_COUNT;
 811                 printk("OBD: Type %s has refcount (%d)\n", nm,
 812                        type->typ_refcnt);
 813                 EXIT;
 814                 return -EBUSY;
 815         }
 816
 817         list_del(&type->typ_chain);
 818         OBD_FREE(type, sizeof(*type));
 819         MOD_DEC_USE_COUNT;
 820         return 0;
 821 }
 822
 823 /* declare character device */
 824 static struct file_operations obd_psdev_fops = {
 825         NULL,                  /* llseek */
 826         NULL,                  /* read */
 827         NULL,                  /* write */
 828         NULL,                  /* presto_psdev_readdir */
 829         NULL,                  /* poll */
 830         obd_class_ioctl,       /* ioctl */
 831         NULL,                  /* presto_psdev_mmap */
 832         obd_class_open,        /* open */
 833         NULL,
 834         obd_class_release,     /* release */
 835         NULL,                  /* fsync */
 836         NULL,                  /* fasync */
 837         NULL,                  /* check_media_change */
 838         NULL,                  /* revalidate */
 839         NULL                   /* lock */
 840 };
 841
 842
 843 /* modules setup */
 844
 845 int init_obd(void)
 846 {
 847         int i;
 848
 849         printk(KERN_INFO "OBD class driver  v0.01, braam@stelias.com\n");
 850
 851         INIT_LIST_HEAD(&obd_types);
 852
 853         if (register_chrdev(OBD_PSDEV_MAJOR,"obd_psdev",
 854                             &obd_psdev_fops)) {
 855                 printk(KERN_ERR "obd_psdev: unable to get major %d\n",
 856                        OBD_PSDEV_MAJOR);
 857                 return -EIO;
 858         }
 859
 860         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 861                 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
 862                 obd_dev[i].obd_minor = i;
 863                 INIT_LIST_HEAD(&obd_dev[i].obd_gen_clients);
 864         }
 865
 866         obd_init_obdo_cache();
 867         obd_sysctl_init();
 868         obd_init_magic = 0x11223344;
 869         return 0;
 870 }
 871
 872 EXPORT_SYMBOL(obd_register_type);
 873 EXPORT_SYMBOL(obd_unregister_type);
 874
 875 EXPORT_SYMBOL(obd_print_entry);
 876 EXPORT_SYMBOL(obd_debug_level);
 877 EXPORT_SYMBOL(obd_dev);
 878
 879 EXPORT_SYMBOL(gen_connect);
 880 EXPORT_SYMBOL(gen_client);
 881 EXPORT_SYMBOL(gen_cleanup);
 882 EXPORT_SYMBOL(gen_disconnect);
 883 EXPORT_SYMBOL(gen_copy_data);
 884 EXPORT_SYMBOL(obdo_cachep);
 885
 886 /* EXPORT_SYMBOL(gen_multi_attach); */
 887 EXPORT_SYMBOL(gen_multi_setup);
 888 EXPORT_SYMBOL(gen_multi_cleanup);
 889
 890
 891 #ifdef MODULE
 892 int init_module(void)
 893 {
 894         return init_obd();
 895 }
 896
 897 void cleanup_module(void)
 898 {
 899         int i;
 900         ENTRY;
 901
 902         unregister_chrdev(OBD_PSDEV_MAJOR, "obd_psdev");
 903         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 904                 struct obd_device *obddev = &obd_dev[i];
 905                 if ( obddev->obd_type &&
 906                      (obddev->obd_flags & OBD_SET_UP) &&
 907                      OBT(obddev) && OBP(obddev, detach) ) {
 908                         /* XXX should this call generic detach otherwise? */
 909                         OBP(obddev, detach)(obddev);
 910                 }
 911         }
 912
 913
 914         obd_sysctl_clean();
 915         obd_init_magic = 0;
 916 }
 917 #endif