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, "Refcount now %d\n", obd_dev[dev].obd_refcnt);
  78
  79         MOD_INC_USE_COUNT;
  80         EXIT;
  81         return 0;
  82 }
  83
  84 /* called when closing /dev/obdNNN */
  85 static int obd_class_release(struct inode * inode, struct file * file)
  86 {
  87         int dev;
  88         ENTRY;
  89
  90         if (!inode)
  91                 return -EINVAL;
  92         dev = MINOR(inode->i_rdev);
  93         if (dev >= MAX_OBD_DEVICES)
  94                 return -ENODEV;
  95         fsync_dev(inode->i_rdev);
  96         if (obd_dev[dev].obd_refcnt <= 0)
  97                 printk(KERN_ALERT "obd_class_release: refcount(%d) <= 0\n",
  98                        obd_dev[dev].obd_refcnt);
  99         obd_dev[dev].obd_refcnt--;
 100
 101         CDEBUG(D_PSDEV, "Refcount now %d\n", obd_dev[dev].obd_refcnt);
 102         MOD_DEC_USE_COUNT;
 103
 104         EXIT;
 105         return 0;
 106 }
 107
 108 /* support function */
 109 static struct obd_type *obd_nm_to_type(char *nm)
 110 {
 111         struct list_head *tmp;
 112         struct obd_type *type;
 113         CDEBUG(D_IOCTL, "SEARCH %s\n", nm);
 114
 115         tmp = &obd_types;
 116         while ( (tmp = tmp->next) != &obd_types ) {
 117                 type = list_entry(tmp, struct obd_type, typ_chain);
 118                 CDEBUG(D_IOCTL, "TYP %s\n", type->typ_name);
 119                 if (strlen(type->typ_name) == strlen(nm) &&
 120                     strcmp(type->typ_name, nm) == 0 ) {
 121                         return type;
 122                 }
 123         }
 124         return NULL;
 125 }
 126
 127
 128 static int getdata(int len, void **data)
 129 {
 130         void *tmp = NULL;
 131
 132         if (!len)
 133                 return 0;
 134
 135         CDEBUG(D_IOCTL, "getdata: len %d, add %p\n", len, *data);
 136
 137         OBD_ALLOC(tmp, void *, len);
 138         if ( !tmp )
 139                 return -ENOMEM;
 140
 141         memset(tmp, 0, len);
 142         if ( copy_from_user(tmp, *data, len)) {
 143                 OBD_FREE(tmp,len);
 144                 return -EFAULT;
 145         }
 146         *data = tmp;
 147
 148         return 0;
 149 }
 150
 151 /* to control /dev/obdNNN */
 152 static int obd_class_ioctl (struct inode * inode, struct file * filp,
 153                             unsigned int cmd, unsigned long arg)
 154 {
 155         int err, i_ino, dev;
 156         struct obd_device *obddev;
 157         struct obd_conn conn;
 158         long int cli_id; /* connect, disconnect */
 159
 160         if (!inode)
 161                 return -EINVAL;
 162
 163         dev = MINOR(inode->i_rdev);
 164         if (dev > MAX_OBD_DEVICES)
 165                 return -ENODEV;
 166         obddev = &obd_dev[dev];
 167         conn.oc_dev = obddev;
 168
 169         switch (cmd) {
 170         case TCGETS:
 171                 return -EINVAL;
 172         case OBD_IOC_ATTACH: {
 173                 struct obd_type *type;
 174                 struct oic_generic input;
 175
 176                 /* have we attached a type to this device */
 177                 if ( obddev->obd_type || (obddev->obd_flags & OBD_ATTACHED) ){
 178                         CDEBUG(D_IOCTL, "OBD Device %d already attached to type %s.\n", dev, obddev->obd_type->typ_name);
 179                         return -EINVAL;
 180                 }
 181
 182                 /* get data structures */
 183                 err = copy_from_user(&input, (void *) arg, sizeof(input));
 184                 if (err)
 185                         return err;
 186
 187                 if ( (err = getdata(input.att_typelen + 1, &input.att_type)) )
 188                         return err;
 189
 190                 /* find the type */
 191                 err = -EINVAL;
 192                 type = obd_nm_to_type(input.att_type);
 193                 OBD_FREE(input.att_type, input.att_typelen + 1);
 194                 if ( !type ) {
 195                         printk("Unknown obd type dev %d\n", dev);
 196                         return err;
 197                 }
 198                 obddev->obd_type = type;
 199
 200                 /* get the attach data */
 201                 if ( (err = getdata(input.att_datalen, &input.att_data)) ) {
 202                         return err;
 203                 }
 204
 205                 INIT_LIST_HEAD(&obddev->obd_gen_clients);
 206                 obddev->obd_multi_count = 0;
 207
 208                 CDEBUG(D_IOCTL, "Attach %d,  datalen %d, type %s\n",
 209                        dev, input.att_datalen, obddev->obd_type->typ_name);
 210                 if (!obddev->obd_type->typ_ops || !OBP(obddev,attach)) {
 211                         obddev->obd_flags |=  OBD_ATTACHED;
 212                         type->typ_refcnt++;
 213                         MOD_INC_USE_COUNT;
 214                         return 0;
 215                 }
 216
 217                 /* do the attach */
 218                 err = OBP(obddev,attach)(obddev,
 219                                          input.att_datalen, input.att_data);
 220                 OBD_FREE(input.att_data, input.att_datalen);
 221
 222                 if ( err ) {
 223                         obddev->obd_flags &= ~OBD_ATTACHED;
 224                         obddev->obd_type = NULL;
 225                 } else {
 226                         obddev->obd_flags |=  OBD_ATTACHED;
 227                         type->typ_refcnt++;
 228                         MOD_INC_USE_COUNT;
 229                 }
 230                 return err;
 231         }
 232
 233         case OBD_IOC_DETACH: {
 234
 235                 if (obddev->obd_flags & OBD_SET_UP)
 236                         return -EINVAL;
 237                 if (! (obddev->obd_flags & OBD_ATTACHED) )
 238                         return -EINVAL;
 239                 if ( !list_empty(&obddev->obd_gen_clients) )
 240                         return -EINVAL;
 241
 242                 obddev->obd_flags &= ~OBD_ATTACHED;
 243                 obddev->obd_type->typ_refcnt--;
 244                 obddev->obd_type = NULL;
 245                 MOD_DEC_USE_COUNT;
 246                 return 0;
 247         }
 248
 249
 250         case OBD_IOC_FORMAT: {
 251                 struct ioc_format {
 252                         int format_datalen;
 253                         void *format_data;
 254                 } input;
 255
 256                 /* have we attached a type to this device */
 257                 if ( !obddev->obd_type ) {
 258                         CDEBUG(D_IOCTL, "OBD Device %d has no type.\n", dev);
 259                         return -EINVAL;
 260                 }
 261
 262                 /* get main structure */
 263                 err = copy_from_user(&input, (void *) arg, sizeof(input));
 264                 if (err)
 265                         return err;
 266
 267                 err = getdata(input.format_datalen, &input.format_data);
 268                 if (err)
 269                         return err;
 270
 271                 if (!obddev->obd_type->typ_ops ||
 272                     !obddev->obd_type->typ_ops->o_format )
 273                         return -EOPNOTSUPP;
 274
 275                 /* do the format */
 276                 CDEBUG(D_IOCTL, "Format %d, type %s\n", dev,
 277                        obddev->obd_type->typ_name);
 278                 err = obddev->obd_type->typ_ops->o_format
 279                         (obddev, input.format_datalen, input.format_data);
 280
 281                 OBD_FREE(input.format_data, input.format_datalen);
 282                 return err;
 283         }
 284         case OBD_IOC_PARTITION: {
 285                 struct ioc_part {
 286                         int part_datalen;
 287                         void *part_data;
 288                 } input;
 289
 290                 /* have we attached a type to this device */
 291                 if ( !obddev->obd_type ) {
 292                         CDEBUG(D_IOCTL, "OBD Device %d has no type.\n", dev);
 293                         return -EINVAL;
 294                 }
 295
 296                 /* get main structure */
 297                 err = copy_from_user(&input, (void *) arg, sizeof(input));
 298                 if (err)
 299                         return err;
 300
 301                 err = getdata(input.part_datalen, &input.part_data);
 302                 if (err)
 303                         return err;
 304
 305                 if (!obddev->obd_type->typ_ops ||
 306                     !obddev->obd_type->typ_ops->o_partition )
 307                         return -EOPNOTSUPP;
 308
 309                 /* do the partition */
 310                 CDEBUG(D_IOCTL, "Partition %d, type %s\n", dev,
 311                        obddev->obd_type->typ_name);
 312                 err = obddev->obd_type->typ_ops->o_partition
 313                         (obddev, input.part_datalen, input.part_data);
 314
 315                 OBD_FREE(input.part_data, input.part_datalen);
 316                 return err;
 317         }
 318
 319         case OBD_IOC_COPY: {
 320                 struct ioc_mv_s mvdata;
 321                 struct ioc_part {
 322                         int part_datalen;
 323                         void *part_data;
 324                 } input;
 325                 obdattr *srcoa, *tgtoa;
 326
 327                 if ( (!(obddev->obd_flags & OBD_SET_UP)) ||
 328                      (!(obddev->obd_flags & OBD_ATTACHED))) {
 329                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 330                         return -EINVAL;
 331                 }
 332
 333                 /* get main structure */
 334                 err = copy_from_user(&input, (void *) arg, sizeof(input));
 335                 if (err)
 336                         return err;
 337
 338
 339                 err = copy_from_user(&mvdata, input.part_data, sizeof(mvdata));
 340                 if (err)
 341                         return err;
 342
 343                 if (!obddev->obd_type->typ_ops ||
 344                     !obddev->obd_type->typ_ops->o_copy )
 345                         return -EOPNOTSUPP;
 346
 347                 /* do the partition */
 348                 CDEBUG(D_IOCTL, "Copy %d, type %s src %ld tgt %ld\n", dev,
 349                        obddev->obd_type->typ_name, mvdata.src, mvdata.tgt);
 350
 351                 conn.oc_id = mvdata.conn_id;
 352                 srcoa = obd_oa_fromid(&conn, mvdata.src);
 353                 if ( !srcoa )
 354                         return -ENOENT;
 355                 tgtoa = obd_oa_fromid(&conn, mvdata.tgt);
 356                 if ( ! tgtoa ) {
 357                         obd_free_oa(srcoa);
 358                         return -ENOMEM;
 359                 }
 360
 361                 err = obddev->obd_type->typ_ops->o_copy(&conn,srcoa, tgtoa);
 362
 363                 obd_free_oa(srcoa);
 364                 obd_free_oa(tgtoa);
 365                 return err;
 366         }
 367         case OBD_IOC_MIGR: {
 368                 struct ioc_mv_s mvdata;
 369                 struct ioc_part {
 370                         int part_datalen;
 371                         void *part_data;
 372                 } input;
 373                 obdattr *srcoa, *tgtoa;
 374
 375                 if ( (!(obddev->obd_flags & OBD_SET_UP)) ||
 376                      (!(obddev->obd_flags & OBD_ATTACHED))) {
 377                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 378                         return -EINVAL;
 379                 }
 380
 381                 /* get main structure */
 382                 err = copy_from_user(&input, (void *) arg, sizeof(input));
 383                 if (err)
 384                         return err;
 385
 386
 387                 CDEBUG(D_IOCTL, "Migrate copying %d\n", sizeof(mvdata));
 388                 err = copy_from_user(&mvdata, input.part_data, sizeof(mvdata));
 389                 if (err)
 390                         return err;
 391
 392                 if (!obddev->obd_type->typ_ops ||
 393                     !obddev->obd_type->typ_ops->o_copy )
 394                         return -EOPNOTSUPP;
 395
 396                 /* do the partition */
 397                 CDEBUG(D_IOCTL, "Migrate %d, type %s conn %d src %ld tgt %ld\n", dev,
 398                        obddev->obd_type->typ_name, mvdata.conn_id, mvdata.src, mvdata.tgt);
 399
 400
 401                 if ( ! (srcoa = obd_empty_oa()) )
 402                         return -ENOMEM;
 403                 if ( ! (tgtoa = obd_empty_oa()) ) {
 404                         obd_free_oa(srcoa);
 405                         return -ENOMEM;
 406                 }
 407
 408                 srcoa->i_ino = mvdata.src;
 409                 tgtoa->i_ino = mvdata.tgt;
 410
 411                 conn.oc_id = mvdata.conn_id;
 412
 413                 err = obddev->obd_type->typ_ops->o_migrate(&conn, tgtoa, srcoa);
 414
 415                 obd_free_oa(srcoa);
 416                 obd_free_oa(tgtoa);
 417                 return err;
 418         }
 419
 420         case OBD_IOC_SETUP: {
 421                 struct ioc_setup {
 422                         int setup_datalen;
 423                         void *setup_data;
 424                 } input;
 425
 426                 /* have we attached a type to this device */
 427                 if (!(obddev->obd_flags & OBD_ATTACHED)) {
 428                         CDEBUG(D_IOCTL, "OBD Device %d has no type.\n", dev);
 429                         return -EINVAL;
 430                 }
 431
 432                 /* has this been done already? */
 433                 if ( obddev->obd_flags & OBD_SET_UP ) {
 434                         CDEBUG(D_IOCTL, "Device %d already setup (type %s)\n",
 435                                dev, obddev->obd_type->typ_name);
 436                         return -EINVAL;
 437                 }
 438
 439                 /* get main structure */
 440                 err = copy_from_user(&input, (void *) arg, sizeof(input));
 441                 if (err)
 442                         return err;
 443
 444                 err = getdata(input.setup_datalen, &input.setup_data);
 445                 if (err)
 446                         return err;
 447
 448
 449                 /* do the setup */
 450                 CDEBUG(D_IOCTL, "Setup %d, type %s\n", dev,
 451                        obddev->obd_type->typ_name);
 452                 if ( !obddev->obd_type->typ_ops ||
 453                      !obddev->obd_type->typ_ops->o_setup ) {
 454                         obddev->obd_type->typ_refcnt++;
 455                         obddev->obd_flags |= OBD_SET_UP;
 456                         return 0;
 457                 }
 458
 459                 err = obddev->obd_type->typ_ops->o_setup
 460                         (obddev, input.setup_datalen, input.setup_data);
 461
 462                 if ( err )
 463                         obddev->obd_flags &= ~OBD_SET_UP;
 464                 else {
 465                         obddev->obd_type->typ_refcnt++;
 466                         obddev->obd_flags |= OBD_SET_UP;
 467                 }
 468                 return err;
 469         }
 470         case OBD_IOC_CLEANUP: {
 471                 int rc;
 472
 473                 /* has this minor been registered? */
 474                 if (!obddev->obd_type)
 475                         return -ENODEV;
 476
 477                 if ( !obddev->obd_type->typ_refcnt )
 478                         printk("OBD_CLEANUP: refcount wrap!\n");
 479
 480                 if ( !obddev->obd_flags & OBD_SET_UP )
 481                         return -EINVAL;
 482
 483                 if ( !obddev->obd_type->typ_ops->o_cleanup )
 484                         goto cleanup_out;
 485
 486                 /* cleanup has no argument */
 487                 rc = OBP(obddev, cleanup)(obddev);
 488                 if ( rc )
 489                         return rc;
 490
 491         cleanup_out:
 492                 obddev->obd_flags &= ~OBD_SET_UP;
 493                 obddev->obd_type->typ_refcnt--;
 494                 return 0;
 495         }
 496         case OBD_IOC_CONNECT:
 497         {
 498
 499                 if ( (!(obddev->obd_flags & OBD_SET_UP)) ||
 500                      (!(obddev->obd_flags & OBD_ATTACHED))) {
 501                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 502                         return -EINVAL;
 503                 }
 504
 505
 506                 if (obddev->obd_type->typ_ops->o_connect(&conn))
 507                         return -EINVAL;
 508
 509                 return copy_to_user((int *)arg, &conn.oc_id,
 510                                     sizeof(int));
 511         }
 512         case OBD_IOC_DISCONNECT:
 513                 /* frees data structures */
 514                 /* has this minor been registered? */
 515                 if (!obddev->obd_type)
 516                         return -ENODEV;
 517
 518                 get_user(cli_id, (int *) arg);
 519                 conn.oc_id = cli_id;
 520
 521                 OBP(obddev, disconnect)(&conn);
 522                 return 0;
 523
 524         case OBD_IOC_SYNC: {
 525                 /* sync doesn't need a connection ID, because it knows
 526                  * what device it was called on, and can thus get the
 527                  * superblock that it needs. */
 528                 /* has this minor been registered? */
 529                 if (!obddev->obd_type)
 530                         return -ENODEV;
 531
 532                 if (!obddev->u.ext2.ext2_sb || !obddev->u.ext2.ext2_sb->s_dev) {
 533                         CDEBUG(D_IOCTL, "fatal: device not initialized.\n");
 534                         err = -EINVAL;
 535                 } else {
 536                         if ((err = fsync_dev(obddev->u.ext2.ext2_sb->s_dev)))
 537                                 CDEBUG(D_IOCTL, "sync: fsync_dev failure\n");
 538                         else
 539                                 CDEBUG(D_IOCTL, "sync: success\n");
 540                 }
 541
 542                 return put_user(err, (int *) arg);
 543         }
 544         case OBD_IOC_CREATE: {
 545                 int err;
 546                 struct oic_create_s foo;
 547
 548                 if ( copy_from_user(&foo, (const void *)arg, sizeof(foo)) )
 549                         return -EFAULT;
 550
 551                 /* has this minor been registered? */
 552                 if ( !(obddev->obd_flags & OBD_ATTACHED) ||
 553                      !(obddev->obd_flags & OBD_SET_UP))
 554                         return -ENODEV;
 555                 conn.oc_id = foo.conn_id;
 556
 557                 i_ino = OBP(obddev, create)(&conn, foo.prealloc, &err);
 558                 if (err) {
 559                         CDEBUG(D_IOCTL, "create: obd_inode_new failure\n");
 560                         /* 0 is the only error value */
 561                         return put_user(0, (int *) arg);
 562                 }
 563
 564                 return put_user(i_ino, (int *) arg);
 565         }
 566         case OBD_IOC_DESTROY:
 567         {
 568                 struct destroy_s {
 569                         unsigned int conn_id;
 570                         unsigned int ino;
 571                 } destroy;
 572                 obdattr *oa;
 573                 int rc;
 574
 575                 if ( ! (oa = obd_empty_oa()) )
 576                         return -ENOMEM;
 577
 578                 /* has this minor been registered? */
 579                 if (!obddev->obd_type)
 580                         return -ENODEV;
 581
 582
 583                 copy_from_user(&destroy, (int *)arg, sizeof(struct destroy_s));
 584                 if ( !obddev->obd_type ||
 585                      !obddev->obd_type->typ_ops->o_destroy)
 586                         return -EINVAL;
 587
 588                 oa->i_ino = destroy.ino;
 589                 conn.oc_id = destroy.conn_id;
 590                 rc = obddev->obd_type->typ_ops->o_destroy(&conn, oa);
 591                 OBD_FREE(oa, sizeof(*oa));
 592                 return rc;
 593         }
 594         case OBD_IOC_SETATTR:
 595         {
 596                 struct oic_attr_s foo;
 597                 obdattr *oa;
 598                 int rc;
 599
 600                 if ( ! (oa = obd_empty_oa()) )
 601                         return -ENOMEM;
 602
 603                 /* has this minor been registered? */
 604                 if (!obddev->obd_type)
 605                         return -ENODEV;
 606
 607                 rc = copy_from_user(&foo, (int *)arg, sizeof(foo));
 608                 if (rc)
 609                         return rc;
 610
 611                 if ( !obddev->obd_type ||
 612                      !obddev->obd_type->typ_ops->o_setattr)
 613                         return -EINVAL;
 614
 615                 oa->i_ino = foo.ino;
 616                 inode_setattr(oa, &foo.iattr);
 617                 conn.oc_id = foo.conn_id;
 618                 rc = obddev->obd_type->typ_ops->o_setattr(&conn, oa);
 619                 OBD_FREE(oa, sizeof(*oa));
 620                 return rc;
 621         }
 622
 623         case OBD_IOC_GETATTR:
 624         {
 625                 int rc;
 626                 struct oic_getattr {
 627                         unsigned int conn_id;
 628                         unsigned long ino;
 629                 } foo;
 630                 struct iattr iattr;
 631                 obdattr *oa;
 632
 633                 rc = copy_from_user(&foo, (int *)arg, sizeof(foo));
 634                 if (rc)
 635                         return rc;
 636
 637                 conn.oc_id = foo.conn_id;
 638                 oa = obd_oa_fromid(&conn, foo.ino);
 639                 if ( !oa )
 640                         return -ENOENT;
 641
 642                 inode_to_iattr(oa, &iattr);
 643                 rc = copy_to_user((int *)arg, &iattr, sizeof(iattr));
 644                 return rc;
 645         }
 646
 647         case OBD_IOC_READ:
 648         {
 649                 obdattr *oa = NULL;
 650                 int rc;
 651                 struct oic_rw_s rw_s;  /* read, write ioctl str */
 652
 653                 rc = copy_from_user(&rw_s, (int *)arg, sizeof(rw_s));
 654                 if ( rc )
 655                         goto READ_OUT;
 656
 657
 658                 conn.oc_id = rw_s.conn_id;
 659                 if ( ! (oa = obd_oa_fromid(&conn, rw_s.id)) )
 660                         return -ENOENT;
 661
 662                 rc = -EINVAL;
 663                 if ( !obddev->obd_type->typ_ops ||
 664                      !obddev->obd_type->typ_ops->o_read )
 665                         goto READ_OUT;
 666
 667                 rc = obddev->obd_type->typ_ops->o_read
 668                         (&conn, oa, rw_s.buf, &rw_s.count, rw_s.offset);
 669                 if ( rc )
 670                         goto READ_OUT;
 671
 672                 rc = copy_to_user((int*)arg, &rw_s.count, sizeof(rw_s.count));
 673
 674         READ_OUT:
 675                 if ( oa )
 676                         OBD_FREE(oa, sizeof(*oa));
 677                 return rc;
 678         }
 679
 680         case OBD_IOC_WRITE: {
 681                 obdattr *oa = NULL;
 682                 int rc;
 683                 struct oic_rw_s rw_s;  /* read, write ioctl str */
 684
 685                 rc = copy_from_user(&rw_s, (int *)arg, sizeof(rw_s));
 686                 if ( rc )
 687                         goto WRITE_OUT;
 688
 689                 conn.oc_id = rw_s.conn_id;
 690                 oa = obd_oa_fromid(&conn, rw_s.id);
 691                 if ( !oa )
 692                         return -ENOENT;
 693
 694                 rc = -EINVAL;
 695                 if ( !obddev->obd_type->typ_ops ||
 696                      !obddev->obd_type->typ_ops->o_write )
 697                         goto WRITE_OUT;
 698
 699                 rc = obddev->obd_type->typ_ops->o_write
 700                         (&conn, oa, rw_s.buf, &rw_s.count, rw_s.offset);
 701                 if ( rc )
 702                         goto WRITE_OUT;
 703
 704                 rc = copy_to_user((int*)arg, &rw_s.count, sizeof(rw_s.count));
 705
 706         WRITE_OUT:
 707                 OBD_FREE(oa, sizeof(*oa));
 708                 return rc;
 709         }
 710         case OBD_IOC_PREALLOCATE: {
 711                 struct oic_prealloc_s prealloc;
 712                 int rc;
 713
 714                 /* has this minor been registered? */
 715                 if (!obddev->obd_type)
 716                         return -ENODEV;
 717
 718
 719                 rc = copy_from_user(&prealloc, (int *)arg, sizeof(prealloc));
 720                 if (rc)
 721                         return -ENOMEM;
 722
 723                 if ( !(obddev->obd_flags & OBD_ATTACHED) ||
 724                      !(obddev->obd_flags & OBD_SET_UP)) {
 725                         CDEBUG(D_IOCTL, "fatal: device not initialized.\n");
 726                         return -EINVAL;
 727                 }
 728
 729                 if (!obddev->obd_type ||
 730                     !obddev->obd_type->typ_ops->o_preallocate)
 731                         return -EOPNOTSUPP;
 732                 conn.oc_id = prealloc.cli_id;
 733                 rc = obddev->obd_type->typ_ops->o_preallocate
 734                         (&conn, &prealloc.alloc, prealloc.inodes);
 735                 if ( rc )
 736                         return rc;
 737
 738                 return copy_to_user((int *)arg, &prealloc, sizeof(prealloc));
 739         }
 740         case OBD_IOC_STATFS:
 741         {
 742                 struct statfs *tmp;
 743                 unsigned int conn_id;
 744                 struct statfs buf;
 745                 int rc;
 746
 747                 /* has this minor been registered? */
 748                 if (!obddev->obd_type)
 749                         return -ENODEV;
 750
 751                 tmp = (void *)arg + sizeof(unsigned int);
 752                 get_user(conn_id, (int *) arg);
 753                 if ( !obddev->obd_type ||
 754                      !obddev->obd_type->typ_ops->o_statfs)
 755                         return -EINVAL;
 756
 757                 conn.oc_id = conn_id;
 758                 rc = obddev->obd_type->typ_ops->o_statfs(&conn, &buf);
 759                 if ( rc )
 760                         return rc;
 761                 rc = copy_to_user(tmp, &buf, sizeof(buf));
 762                 return rc;
 763
 764         }
 765         default: {
 766                 struct obd_type *type;
 767                 struct oic_generic input;
 768                 void *karg;
 769
 770                 /* get data structures */
 771                 err = copy_from_user(&input, (void *) arg, sizeof(input));
 772                 if (err) {
 773                         EXIT;
 774                         return err;
 775                 }
 776
 777                 if ( (err = getdata(input.att_typelen + 1, &input.att_type))){
 778                         EXIT;
 779                         return err;
 780                 }
 781
 782                 /* find the type */
 783                 err = -EINVAL;
 784                 type = obd_nm_to_type(input.att_type);
 785                 OBD_FREE(input.att_type, input.att_typelen + 1);
 786                 if ( !type ) {
 787                         printk("Unknown obd type dev %d\n", dev);
 788                         EXIT;
 789                         return err;
 790                 }
 791
 792                 if ( !type->typ_ops->o_iocontrol ) {
 793                         EXIT;
 794                         return -EINVAL;
 795                 }
 796                 conn.oc_id = input.att_connid;
 797
 798                 CDEBUG(D_IOCTL, "Calling ioctl %x for type %s, len %d\n",
 799                        cmd, type->typ_name, input.att_datalen);
 800
 801                 /* get the generic data */
 802                 karg = input.att_data;
 803                 if ( (err = getdata(input.att_datalen, &karg)) ) {
 804                         EXIT;
 805                         return err;
 806                 }
 807
 808                 err = type->typ_ops->o_iocontrol
 809                         (cmd, &conn, input.att_datalen,
 810                          karg, input.att_data);
 811                 OBD_FREE(karg, input.att_datalen);
 812
 813                 EXIT;
 814                 return err;
 815         }
 816         }
 817 }
 818
 819 /* Driver interface done, utility functions follow */
 820
 821 int obd_register_type(struct obd_ops *ops, char *nm)
 822 {
 823         struct obd_type *type;
 824
 825
 826         if (obd_init_magic != 0x11223344) {
 827                 EXIT;
 828                 return -EINVAL;
 829         }
 830
 831         if  ( obd_nm_to_type(nm) ) {
 832                 CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
 833                 EXIT;
 834                 return -1;
 835         }
 836
 837         OBD_ALLOC(type, struct obd_type * , sizeof(*type));
 838         if ( !type ) {
 839                 EXIT;
 840                 return -ENOMEM;
 841         }
 842         memset(type, 0, sizeof(*type));
 843         INIT_LIST_HEAD(&type->typ_chain);
 844         MOD_INC_USE_COUNT;
 845         list_add(&type->typ_chain, obd_types.next);
 846         type->typ_ops = ops;
 847         type->typ_name = nm;
 848         EXIT;
 849         return 0;
 850 }
 851
 852 int obd_unregister_type(char *nm)
 853 {
 854         struct obd_type *type = obd_nm_to_type(nm);
 855
 856         if ( !type ) {
 857                 MOD_DEC_USE_COUNT;
 858                 printk("OBD: NO TYPE\n");
 859                 EXIT;
 860                 return -1;
 861         }
 862
 863         if ( type->typ_refcnt ) {
 864                 MOD_DEC_USE_COUNT;
 865                 printk("OBD: refcount wrap\n");
 866                 EXIT;
 867                 return -1;
 868         }
 869
 870         list_del(&type->typ_chain);
 871         OBD_FREE(type, sizeof(*type));
 872         MOD_DEC_USE_COUNT;
 873         return 0;
 874 }
 875
 876 /* declare character device */
 877 static struct file_operations obd_psdev_fops = {
 878         NULL,                  /* llseek */
 879         NULL,                  /* read */
 880         NULL,                  /* write */
 881         NULL,                  /* presto_psdev_readdir */
 882         NULL,                  /* poll */
 883         obd_class_ioctl,       /* ioctl */
 884         NULL,                  /* presto_psdev_mmap */
 885         obd_class_open,        /* open */
 886         NULL,
 887         obd_class_release,     /* release */
 888         NULL,                  /* fsync */
 889         NULL,                  /* fasync */
 890         NULL,                  /* check_media_change */
 891         NULL,                  /* revalidate */
 892         NULL                   /* lock */
 893 };
 894
 895
 896 /* modules setup */
 897
 898 int init_obd(void)
 899 {
 900         int i;
 901
 902         printk(KERN_INFO "OBD class driver  v0.002, braam@stelias.com\n");
 903
 904         INIT_LIST_HEAD(&obd_types);
 905
 906         if (register_chrdev(OBD_PSDEV_MAJOR,"obd_psdev",
 907                             &obd_psdev_fops)) {
 908                 printk(KERN_ERR "obd_psdev: unable to get major %d\n",
 909                        OBD_PSDEV_MAJOR);
 910                 return -EIO;
 911         }
 912
 913         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 914                 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
 915                 obd_dev[i].obd_minor = i;
 916                 INIT_LIST_HEAD(&obd_dev[i].obd_gen_clients);
 917         }
 918
 919         obd_sysctl_init();
 920         obd_init_magic = 0x11223344;
 921         return 0;
 922 }
 923
 924 EXPORT_SYMBOL(obd_register_type);
 925 EXPORT_SYMBOL(obd_unregister_type);
 926
 927 EXPORT_SYMBOL(obd_print_entry);
 928 EXPORT_SYMBOL(obd_debug_level);
 929 EXPORT_SYMBOL(obd_dev);
 930
 931 EXPORT_SYMBOL(gen_connect);
 932 EXPORT_SYMBOL(gen_client);
 933 EXPORT_SYMBOL(gen_cleanup);
 934 EXPORT_SYMBOL(gen_disconnect);
 935 EXPORT_SYMBOL(gen_copy_data);
 936
 937 /* EXPORT_SYMBOL(gen_multi_attach); */
 938 EXPORT_SYMBOL(gen_multi_setup);
 939 EXPORT_SYMBOL(gen_multi_cleanup);
 940
 941
 942 #ifdef MODULE
 943 int init_module(void)
 944 {
 945         return init_obd();
 946 }
 947
 948 void cleanup_module(void)
 949 {
 950         int i;
 951         ENTRY;
 952
 953         unregister_chrdev(OBD_PSDEV_MAJOR, "obd_psdev");
 954         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 955                 struct obd_device *obddev = &obd_dev[i];
 956                 if ( obddev->obd_type &&
 957                      (obddev->obd_flags & OBD_SET_UP) &&
 958                      obddev->obd_type->typ_ops->o_detach ) {
 959                         OBP(obddev, detach)(obddev);
 960                 }
 961         }
 962
 963
 964         obd_sysctl_clean();
 965         obd_init_magic = 0;
 966 }
 967 #endif