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