lustre/obdclass/class_obd.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *              An implementation of a loadable kernel mode driver providing
   5  *              multiple kernel/user space bidirectional communications links.
   6  *
   7  *              Author:         Alan Cox <alan@cymru.net>
   8  *
   9  *              This program is free software; you can redistribute it and/or
  10  *              modify it under the terms of the GNU General Public License
  11  *              version 2 as published by the Free Software Foundation.
  12  *
  13  *              Adapted to become the Linux 2.0 Coda pseudo device
  14  *              Peter  Braam  <braam@maths.ox.ac.uk>
  15  *              Michael Callahan <mjc@emmy.smith.edu>
  16  *
  17  *              Changes for Linux 2.1
  18  *              Copyright (c) 1997 Carnegie-Mellon University
  19  *
  20  *              Redone again for Intermezzo
  21  *              Copyright (c) 1998 Peter J. Braam
  22  *
  23  *              Hacked up again for simulated OBD
  24  *              Copyright (c) 1999 Stelias Computing, Inc.
  25  *                (authors {pschwan,braam}@stelias.com)
  26  *              Copyright (C) 1999 Seagate Technology, Inc.
  27  *              Copyright (C) 2001 Cluster File Systems, Inc.
  28  *
  29  *
  30  */
  31
  32 #define EXPORT_SYMTAB
  33 #include <linux/config.h> /* for CONFIG_PROC_FS */
  34 #include <linux/module.h>
  35 #include <linux/errno.h>
  36 #include <linux/kernel.h>
  37 #include <linux/major.h>
  38 #include <linux/kmod.h>   /* for request_module() */
  39 #include <linux/sched.h>
  40 #include <linux/lp.h>
  41 #include <linux/slab.h>
  42 #include <linux/ioport.h>
  43 #include <linux/fcntl.h>
  44 #include <linux/delay.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/proc_fs.h>
  47 #include <linux/fs.h>
  48 #include <linux/poll.h>
  49 #include <linux/init.h>
  50 #include <linux/list.h>
  51 #include <asm/io.h>
  52 #include <asm/system.h>
  53 #include <asm/poll.h>
  54 #include <asm/uaccess.h>
  55 #include <linux/miscdevice.h>
  56
  57 #define DEBUG_SUBSYSTEM S_CLASS
  58
  59 #include <linux/obd_support.h>
  60 #include <linux/obd_class.h>
  61
  62 static int obd_init_magic;
  63 int obd_print_entry = 1;
  64 int obd_debug_level = ~0;
  65 unsigned long obd_memory = 0;
  66 struct obd_device obd_dev[MAX_OBD_DEVICES];
  67 struct list_head obd_types;
  68
  69 /*  opening /dev/obd */
  70 static int obd_class_open(struct inode * inode, struct file * file)
  71 {
  72         ENTRY;
  73
  74         file->private_data = NULL;
  75         MOD_INC_USE_COUNT;
  76         EXIT;
  77         return 0;
  78 }
  79
  80 /*  closing /dev/obd */
  81 static int obd_class_release(struct inode * inode, struct file * file)
  82 {
  83         ENTRY;
  84
  85         if (file->private_data)
  86                 file->private_data = NULL;
  87
  88         MOD_DEC_USE_COUNT;
  89         EXIT;
  90         return 0;
  91 }
  92
  93 /*
  94  * support functions: we could use inter-module communication, but this
  95  * is more portable to other OS's
  96  */
  97 static struct obd_type *obd_search_type(char *nm)
  98 {
  99         struct list_head *tmp;
 100         struct obd_type *type;
 101         CDEBUG(D_INFO, "SEARCH %s\n", nm);
 102
 103         tmp = &obd_types;
 104         while ( (tmp = tmp->next) != &obd_types ) {
 105                 type = list_entry(tmp, struct obd_type, typ_chain);
 106                 CDEBUG(D_INFO, "TYP %s\n", type->typ_name);
 107                 if (strlen(type->typ_name) == strlen(nm) &&
 108                     strcmp(type->typ_name, nm) == 0 ) {
 109                         return type;
 110                 }
 111         }
 112         return NULL;
 113 }
 114
 115 static struct obd_type *obd_nm_to_type(char *nm)
 116 {
 117         struct obd_type *type = obd_search_type(nm);
 118
 119 #ifdef CONFIG_KMOD
 120         if ( !type ) {
 121                 if ( !request_module(nm) ) {
 122                         CDEBUG(D_INFO, "Loaded module '%s'\n", nm);
 123                         type = obd_search_type(nm);
 124                 } else {
 125                         CDEBUG(D_INFO, "Can't load module '%s'\n", nm);
 126                 }
 127         }
 128 #endif
 129         return type;
 130 }
 131
 132 /* to control /dev/obd */
 133 static int obd_class_ioctl (struct inode * inode, struct file * filp,
 134                             unsigned int cmd, unsigned long arg)
 135 {
 136         /* NOTE this must be larger than any of the ioctl data structs */
 137         char buf[1024];
 138         struct obd_ioctl_data *data;
 139         struct obd_device *obd = filp->private_data;
 140         struct obd_conn conn;
 141         int rw = OBD_BRW_READ;
 142         int err = 0;
 143         ENTRY;
 144
 145         memset(buf, 0, sizeof(buf));
 146
 147         if (!obd && cmd != OBD_IOC_DEVICE && cmd != TCGETS) {
 148                 CERROR("OBD ioctl: No device\n");
 149                 return -EINVAL;
 150         }
 151         if (obd_ioctl_getdata(buf, buf + 800, (void *)arg)) {
 152                 CERROR("OBD ioctl: data error\n");
 153                 return -EINVAL;
 154         }
 155         data = (struct obd_ioctl_data *)buf;
 156
 157         switch (cmd) {
 158         case TCGETS: {
 159                 EXIT;
 160                 return -EINVAL;
 161         }
 162         case OBD_IOC_DEVICE: {
 163                 CDEBUG(D_IOCTL, "\n");
 164                 if (data->ioc_dev >= MAX_OBD_DEVICES ||
 165                     data->ioc_dev < 0) {
 166                         CERROR("OBD ioctl: DEVICE insufficient devices\n");
 167                         return -EINVAL;
 168                 }
 169                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 170
 171                 filp->private_data = &obd_dev[data->ioc_dev];
 172                 EXIT;
 173                 return 0;
 174         }
 175
 176         case OBD_IOC_ATTACH: {
 177                 struct obd_type *type;
 178
 179                 ENTRY;
 180                 /* have we attached a type to this device */
 181                 if ( obd->obd_flags & OBD_ATTACHED ) {
 182                         CERROR("OBD: Device %d already typed as  %s.\n",
 183                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 184                         return -EBUSY;
 185                 }
 186
 187                 CDEBUG(D_IOCTL, "attach %s %s\n",  MKSTR(data->ioc_inlbuf1),
 188                        MKSTR(data->ioc_inlbuf2));
 189
 190                 /* find the type */
 191                 type = obd_nm_to_type(data->ioc_inlbuf1);
 192                 if ( !type ) {
 193                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 194                         return -EINVAL;
 195                 }
 196
 197                 obd->obd_type = type;
 198                 obd->obd_multi_count = 0;
 199                 INIT_LIST_HEAD(&obd->obd_gen_clients);
 200                 INIT_LIST_HEAD(&obd->obd_req_list);
 201
 202                 /* do the attach */
 203                 if ( OBT(obd) && OBP(obd, attach) ) {
 204                         err = OBP(obd, attach)(obd, sizeof(*data), data);
 205                 }
 206
 207                 if ( err ) {
 208                         obd->obd_type = NULL;
 209                         EXIT;
 210                 } else {
 211                         obd->obd_flags |=  OBD_ATTACHED;
 212                         type->typ_refcnt++;
 213                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 214                                obd->obd_minor, data->ioc_inlbuf1);
 215                         obd->obd_proc_entry =
 216                                 proc_lustre_register_obd_device(obd);
 217                         MOD_INC_USE_COUNT;
 218                         EXIT;
 219                 }
 220
 221                 return err;
 222         }
 223
 224         case OBD_IOC_DETACH: {
 225                 ENTRY;
 226                 if (obd->obd_flags & OBD_SET_UP) {
 227                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 228                         return -EBUSY;
 229                 }
 230                 if (! (obd->obd_flags & OBD_ATTACHED) ) {
 231                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 232                         return -ENODEV;
 233                 }
 234                 if ( !list_empty(&obd->obd_gen_clients) ) {
 235                         CERROR("OBD device %d has connected clients\n",
 236                                obd->obd_minor);
 237                         return -EBUSY;
 238                 }
 239                 if ( !list_empty(&obd->obd_req_list) ) {
 240                         CERROR("OBD device %d has hanging requests\n",
 241                                obd->obd_minor);
 242                         return -EBUSY;
 243                 }
 244
 245                 if (obd->obd_proc_entry)
 246                         proc_lustre_release_obd_device(obd);
 247
 248                 obd->obd_flags &= ~OBD_ATTACHED;
 249                 obd->obd_type->typ_refcnt--;
 250                 obd->obd_type = NULL;
 251                 MOD_DEC_USE_COUNT;
 252                 EXIT;
 253                 return 0;
 254         }
 255
 256         case OBD_IOC_SETUP: {
 257                 ENTRY;
 258                 /* have we attached a type to this device? */
 259                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 260                         CERROR("Device %d not attached\n", obd->obd_minor);
 261                         return -ENODEV;
 262                 }
 263
 264                 /* has this been done already? */
 265                 if ( obd->obd_flags & OBD_SET_UP ) {
 266                         CERROR("Device %d already setup (type %s)\n",
 267                                obd->obd_minor, obd->obd_type->typ_name);
 268                         return -EBUSY;
 269                 }
 270
 271                 if ( OBT(obd) && OBP(obd, setup) )
 272                         err = obd_setup(obd, sizeof(*data), data);
 273
 274                 if (!err) {
 275                         obd->obd_type->typ_refcnt++;
 276                         obd->obd_flags |= OBD_SET_UP;
 277                         EXIT;
 278                 }
 279
 280                 return err;
 281         }
 282         case OBD_IOC_CLEANUP: {
 283                 ENTRY;
 284
 285                 /* have we attached a type to this device? */
 286                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 287                         CERROR("Device %d not attached\n", obd->obd_minor);
 288                         return -ENODEV;
 289                 }
 290
 291                 if ( OBT(obd) && OBP(obd, cleanup) )
 292                         err = obd_cleanup(obd);
 293
 294                 if (!err) {
 295                         obd->obd_flags &= ~OBD_SET_UP;
 296                         obd->obd_type->typ_refcnt--;
 297                         EXIT;
 298                 }
 299                 return err;
 300         }
 301
 302         case OBD_IOC_CONNECT:
 303         {
 304                 conn.oc_id = data->ioc_conn1;
 305                 conn.oc_dev = obd;
 306
 307                 err = obd_connect(&conn);
 308
 309                 CDEBUG(D_IOCTL, "assigned connection %d\n", conn.oc_id);
 310                 data->ioc_conn1 = conn.oc_id;
 311                 if ( err )
 312                         return err;
 313
 314                 return copy_to_user((int *)arg, data, sizeof(*data));
 315         }
 316
 317         case OBD_IOC_DISCONNECT: {
 318                 conn.oc_id = data->ioc_conn1;
 319                 conn.oc_dev = obd;
 320
 321                 err = obd_disconnect(&conn);
 322                 return err;
 323         }
 324
 325         case OBD_IOC_DEC_USE_COUNT: {
 326                 MOD_DEC_USE_COUNT;
 327                 return 0;
 328         }
 329
 330         case OBD_IOC_CREATE: {
 331                 conn.oc_id = data->ioc_conn1;
 332                 conn.oc_dev = obd;
 333
 334                 err = obd_create(&conn, &data->ioc_obdo1);
 335                 if (err) {
 336                         EXIT;
 337                         return err;
 338                 }
 339
 340                 err = copy_to_user((int *)arg, data, sizeof(*data));
 341                 EXIT;
 342                 return err;
 343         }
 344
 345         case OBD_IOC_GETATTR: {
 346                 conn.oc_id = data->ioc_conn1;
 347                 conn.oc_dev = obd;
 348
 349                 err = obd_getattr(&conn, &data->ioc_obdo1);
 350                 if (err) {
 351                         EXIT;
 352                         return err;
 353                 }
 354
 355                 err = copy_to_user((int *)arg, data, sizeof(*data));
 356                 EXIT;
 357                 return err;
 358         }
 359
 360         case OBD_IOC_SETATTR: {
 361                 conn.oc_id = data->ioc_conn1;
 362                 conn.oc_dev = obd;
 363
 364                 err = obd_setattr(&conn, &data->ioc_obdo1);
 365                 if (err) {
 366                         EXIT;
 367                         return err;
 368                 }
 369
 370                 err = copy_to_user((int *)arg, data, sizeof(*data));
 371                 EXIT;
 372                 return err;
 373         }
 374
 375         case OBD_IOC_DESTROY: {
 376                 conn.oc_id = data->ioc_conn1;
 377                 conn.oc_dev = obd;
 378
 379                 err = obd_destroy(&conn, &data->ioc_obdo1);
 380                 if (err) {
 381                         EXIT;
 382                         return err;
 383                 }
 384
 385                 err = copy_to_user((int *)arg, data, sizeof(*data));
 386                 EXIT;
 387                 return err;
 388         }
 389
 390         case OBD_IOC_BRW_WRITE:
 391                 rw = OBD_BRW_WRITE;
 392         case OBD_IOC_BRW_READ: {
 393                 /* FIXME: use a better ioctl data struct than obd_ioctl_data */
 394                 struct obd_conn conns[2];
 395                 struct obdo     *obdos[2];
 396                 obd_count       oa_bufs[2];
 397                 struct page     **bufs;
 398                 obd_size        counts[2];
 399                 obd_off         offsets[2];
 400                 obd_flag        flags[2];
 401                 int             pages;
 402                 int             i, j;
 403
 404                 oa_bufs[0] = data->ioc_plen1 / PAGE_SIZE;
 405                 oa_bufs[1] = data->ioc_plen2 / PAGE_SIZE;
 406                 pages = oa_bufs[0] + oa_bufs[1];
 407
 408                 CDEBUG(D_INODE, "BRW %s with %d+%d pages\n",
 409                        rw == OBD_BRW_READ ? "read" : "write",
 410                        oa_bufs[0], oa_bufs[1]);
 411                 bufs = kmalloc(pages * sizeof(struct page *), GFP_KERNEL);
 412                 if (!bufs) {
 413                         CERROR("no memory for %d BRW bufs\n", pages);
 414                         EXIT;
 415                         return -ENOMEM;
 416                 }
 417
 418                 obdos[0] = &data->ioc_obdo1;
 419                 obdos[1] = &data->ioc_obdo2;
 420
 421                 pages = 0;
 422                 for (i = 0; i < 2; i++) {
 423                         void *from;
 424
 425                         conns[i].oc_id = (&data->ioc_conn1)[i];
 426                         conns[i].oc_dev = obd;
 427
 428                         from = (&data->ioc_pbuf1)[i];
 429
 430                         for (j = 0; j < oa_bufs[i]; j++) {
 431                                 unsigned long to;
 432
 433                                 to = __get_free_pages(GFP_KERNEL, 0);
 434                                 if (!to) {
 435                                 /*      ||
 436                                     copy_from_user((void *)to,from,PAGE_SIZE))
 437                                         free_pages(to, 0);
 438                                  */
 439                                         CERROR("no memory for brw pages\n");
 440                                         EXIT;
 441                                         goto brw_cleanup;
 442                                 }
 443                                 bufs[pages++] = virt_to_page(to);
 444                                 from += PAGE_SIZE;
 445                         }
 446
 447                         counts[i] = data->ioc_count;
 448                         offsets[i] = data->ioc_offset;
 449                         flags[i] = 0;
 450                 }
 451
 452                 err = obd_brw(rw, conns, 2, obdos, oa_bufs, bufs,
 453                               counts, offsets, flags);
 454
 455                 EXIT;
 456         brw_cleanup:
 457                 while (pages-- > 0)
 458                         free_pages((unsigned long)page_address(bufs[pages]), 0);
 459                 kfree(bufs);
 460                 return err;
 461         }
 462 #if 0
 463         case OBD_IOC_SYNC: {
 464                 struct oic_range_s *range = tmp_buf;
 465
 466                 if (!obd->obd_type)
 467                         return -ENODEV;
 468
 469                 err = copy_from_user(range, (const void *)arg,  sizeof(*range));
 470
 471                 if ( err ) {
 472                         EXIT;
 473                         return err;
 474                 }
 475
 476                 if ( !OBT(obd) || !OBP(obd, sync) ) {
 477                         err = -EOPNOTSUPP;
 478                         EXIT;
 479                         return err;
 480                 }
 481
 482                 /* XXX sync needs to be tested/verified */
 483                 err = OBP(obd, sync)(&conn, &range->obdo, range->count,
 484                                         range->offset);
 485
 486                 if ( err ) {
 487                         EXIT;
 488                         return err;
 489                 }
 490
 491                 return put_user(err, (int *) arg);
 492         }
 493
 494         case OBD_IOC_READ: {
 495                 int err;
 496                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 497
 498                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 499                 if ( err ) {
 500                         EXIT;
 501                         return err;
 502                 }
 503
 504                 conn.oc_id = rw_s->conn_id;
 505
 506                 if ( !OBT(obd) || !OBP(obd, read) ) {
 507                         err = -EOPNOTSUPP;
 508                         EXIT;
 509                         return err;
 510                 }
 511
 512
 513                 err = OBP(obd, read)(&conn, &rw_s->obdo, rw_s->buf,
 514                                         &rw_s->count, rw_s->offset);
 515
 516                 CDEBUG(D_INFO, "READ: conn %d, count %Ld, offset %Ld, '%s'\n",
 517                        rw_s->conn_id, rw_s->count, rw_s->offset, rw_s->buf);
 518                 if ( err ) {
 519                         EXIT;
 520                         return err;
 521                 }
 522
 523                 err = copy_to_user((int*)arg, &rw_s->count, sizeof(rw_s->count));
 524                 EXIT;
 525                 return err;
 526         }
 527
 528         case OBD_IOC_WRITE: {
 529                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 530
 531                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 532                 if ( err ) {
 533                         EXIT;
 534                         return err;
 535                 }
 536
 537                 conn.oc_id = rw_s->conn_id;
 538
 539                 if ( !OBT(obd) || !OBP(obd, write) ) {
 540                         err = -EOPNOTSUPP;
 541                         return err;
 542                 }
 543
 544                 CDEBUG(D_INFO, "WRITE: conn %d, count %Ld, offset %Ld, '%s'\n",
 545                        rw_s->conn_id, rw_s->count, rw_s->offset, rw_s->buf);
 546
 547                 err = OBP(obd, write)(&conn, &rw_s->obdo, rw_s->buf,
 548                                          &rw_s->count, rw_s->offset);
 549                 if ( err ) {
 550                         EXIT;
 551                         return err;
 552                 }
 553
 554                 err = copy_to_user((int *)arg, &rw_s->count,
 555                                    sizeof(rw_s->count));
 556                 EXIT;
 557                 return err;
 558         }
 559         case OBD_IOC_PREALLOCATE: {
 560                 struct oic_prealloc_s *prealloc = tmp_buf;
 561
 562                 /* has this minor been registered? */
 563                 if (!obd->obd_type)
 564                         return -ENODEV;
 565
 566                 err = copy_from_user(prealloc, (int *)arg, sizeof(*prealloc));
 567                 if (err)
 568                         return -EFAULT;
 569
 570                 if ( !(obd->obd_flags & OBD_ATTACHED) ||
 571                      !(obd->obd_flags & OBD_SET_UP)) {
 572                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 573                         return -ENODEV;
 574                 }
 575
 576                 if ( !OBT(obd) || !OBP(obd, preallocate) )
 577                         return -EOPNOTSUPP;
 578
 579                 conn.oc_id = prealloc->conn_id;
 580                 err = OBP(obd, preallocate)(&conn, &prealloc->alloc,
 581                                                prealloc->ids);
 582                 if ( err ) {
 583                         EXIT;
 584                         return err;
 585                 }
 586
 587                 err =copy_to_user((int *)arg, prealloc, sizeof(*prealloc));
 588                 EXIT;
 589                 return err;
 590         }
 591         case OBD_IOC_STATFS: {
 592                 struct statfs *tmp;
 593                 unsigned int conn_id;
 594                 struct statfs buf;
 595
 596                 /* has this minor been registered? */
 597                 if (!obd->obd_type)
 598                         return -ENODEV;
 599
 600                 tmp = (void *)arg + sizeof(unsigned int);
 601                 get_user(conn_id, (int *) arg);
 602
 603                 if ( !OBT(obd) || !OBP(obd, statfs) )
 604                         return -EOPNOTSUPP;
 605
 606                 conn.oc_id = conn_id;
 607                 err = OBP(obd, statfs)(&conn, &buf);
 608                 if ( err ) {
 609                         EXIT;
 610                         return err;
 611                 }
 612                 err = copy_to_user(tmp, &buf, sizeof(buf));
 613                 EXIT;
 614                 return err;
 615
 616         }
 617         case OBD_IOC_COPY: {
 618                 struct ioc_mv_s *mvdata = tmp_buf;
 619
 620                 if ( (!(obd->obd_flags & OBD_SET_UP)) ||
 621                      (!(obd->obd_flags & OBD_ATTACHED))) {
 622                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 623                         return -ENODEV;
 624                 }
 625
 626                 /* get main structure */
 627                 err = copy_from_user(mvdata, (void *) arg, sizeof(*mvdata));
 628                 if (err) {
 629                         EXIT;
 630                         return err;
 631                 }
 632
 633                 if ( !OBT(obd) || !OBP(obd, copy) )
 634                         return -EOPNOTSUPP;
 635
 636                 /* do the partition */
 637                 CDEBUG(D_INFO, "Copy %d, type %s dst %Ld src %Ld\n", dev,
 638                        obd->obd_type->typ_name, mvdata->dst.o_id,
 639                        mvdata->src.o_id);
 640
 641                 conn.oc_id = mvdata->src_conn_id;
 642
 643                 err = OBP(obd, copy)(&conn, &mvdata->dst,
 644                                         &conn, &mvdata->src,
 645                                         mvdata->src.o_size, 0);
 646                 return err;
 647         }
 648
 649         case OBD_IOC_MIGR: {
 650                 struct ioc_mv_s *mvdata = tmp_buf;
 651
 652                 if ( (!(obd->obd_flags & OBD_SET_UP)) ||
 653                      (!(obd->obd_flags & OBD_ATTACHED))) {
 654                         CDEBUG(D_IOCTL, "Device not attached or set up\n");
 655                         return -ENODEV;
 656                 }
 657
 658                 err = copy_from_user(mvdata, (void *) arg, sizeof(*mvdata));
 659                 if (err) {
 660                         EXIT;
 661                         return err;
 662                 }
 663
 664                 CDEBUG(D_INFO, "Migrate copying %d bytes\n", sizeof(*mvdata));
 665
 666                 if ( !OBT(obd) || !OBP(obd, migrate) )
 667                         return -EOPNOTSUPP;
 668
 669                 /* do the partition */
 670                 CDEBUG(D_INFO, "Migrate %d, type %s conn %d src %Ld dst %Ld\n",
 671                        dev, obd->obd_type->typ_name, mvdata->src_conn_id,
 672                        mvdata->src.o_id, mvdata->dst.o_id);
 673
 674                 conn.oc_id = mvdata->src_conn_id;
 675                 err = OBP(obd, migrate)(&conn, &mvdata->dst, &mvdata->src,
 676                                            mvdata->src.o_size, 0);
 677
 678                 return err;
 679         }
 680         case OBD_IOC_PUNCH: {
 681                 struct oic_rw_s *rw_s = tmp_buf;  /* read, write ioctl str */
 682
 683                 err = copy_from_user(rw_s, (int *)arg, sizeof(*rw_s));
 684                 if ( err ) {
 685                         EXIT;
 686                         return err;
 687                 }
 688
 689                 conn.oc_id = rw_s->conn_id;
 690
 691                 if ( !OBT(obd) || !OBP(obd, punch) ) {
 692                         err = -EOPNOTSUPP;
 693                         return err;
 694                 }
 695
 696                 CDEBUG(D_INFO, "PUNCH: conn %d, count %Ld, offset %Ld\n",
 697                        rw_s->conn_id, rw_s->count, rw_s->offset);
 698                 err = OBP(obd, punch)(&conn, &rw_s->obdo, rw_s->count,
 699                                          rw_s->offset);
 700                 if ( err ) {
 701                         EXIT;
 702                         return err;
 703                 }
 704                 EXIT;
 705                 return err;
 706         }
 707
 708         default: {
 709                 struct obd_type *type;
 710                 struct oic_generic input;
 711                 char *nm;
 712                 void *karg;
 713
 714                 /* get data structures */
 715                 err = copy_from_user(&input, (void *)arg, sizeof(input));
 716                 if ( err ) {
 717                         EXIT;
 718                         return err;
 719                 }
 720
 721                 err = getdata(input.att_typelen + 1, &input.att_type);
 722                 if ( err ) {
 723                         EXIT;
 724                         return err;
 725                 }
 726
 727                 /* find the type */
 728                 nm = input.att_type;
 729                 type = obd_nm_to_type(nm);
 730 #ifdef CONFIG_KMOD
 731                 if ( !type ) {
 732                         if ( !request_module(nm) ) {
 733                                 CDEBUG(D_INFO, "Loaded module '%s'\n", nm);
 734                                 type = obd_nm_to_type(nm);
 735                         } else {
 736                                 CDEBUG(D_INFO, "Can't load module '%s'\n", nm);
 737                         }
 738                 }
 739 #endif
 740                 OBD_FREE(input.att_type, input.att_typelen + 1);
 741                 if ( !type ) {
 742                         CERROR("unknown obd type dev %d\n", dev);
 743                         EXIT;
 744                         return -EINVAL;
 745                 }
 746
 747                 if ( !type->typ_ops || !type->typ_ops->o_iocontrol ) {
 748                         EXIT;
 749                         return -EOPNOTSUPP;
 750                 }
 751                 conn.oc_id = input.att_connid;
 752
 753                 CDEBUG(D_INFO, "Calling ioctl %x for type %s, len %d\n",
 754                        cmd, type->typ_name, input.att_datalen);
 755
 756                 /* get the generic data */
 757                 karg = input.att_data;
 758                 err = getdata(input.att_datalen, &karg);
 759                 if ( err ) {
 760                         EXIT;
 761                         return err;
 762                 }
 763
 764                 err = type->typ_ops->o_iocontrol(cmd, &conn, input.att_datalen,
 765                                                  karg, input.att_data);
 766                 OBD_FREE(karg, input.att_datalen);
 767
 768                 EXIT;
 769                 return err;
 770         }
 771 #endif
 772         default:
 773                 return -EINVAL;
 774
 775         }
 776 } /* obd_class_ioctl */
 777
 778
 779 /* Driver interface done, utility functions follow */
 780 int obd_register_type(struct obd_ops *ops, char *nm)
 781 {
 782         struct obd_type *type;
 783
 784         if (obd_init_magic != 0x11223344) {
 785                 CERROR("bad magic for type\n");
 786                 EXIT;
 787                 return -EINVAL;
 788         }
 789
 790         if  ( obd_nm_to_type(nm) ) {
 791                 CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
 792                 EXIT;
 793                 return -EEXIST;
 794         }
 795
 796         OBD_ALLOC(type, sizeof(*type));
 797         if ( !type ) {
 798                 EXIT;
 799                 return -ENOMEM;
 800         }
 801         memset(type, 0, sizeof(*type));
 802         INIT_LIST_HEAD(&type->typ_chain);
 803         MOD_INC_USE_COUNT;
 804         list_add(&type->typ_chain, obd_types.next);
 805         type->typ_ops = ops;
 806         type->typ_name = nm;
 807         EXIT;
 808         return 0;
 809 }
 810
 811 int obd_unregister_type(char *nm)
 812 {
 813         struct obd_type *type = obd_nm_to_type(nm);
 814
 815         if ( !type ) {
 816                 MOD_DEC_USE_COUNT;
 817                 CERROR("unknown obd type\n");
 818                 EXIT;
 819                 return -EINVAL;
 820         }
 821
 822         if ( type->typ_refcnt ) {
 823                 MOD_DEC_USE_COUNT;
 824                 CERROR("type %s has refcount (%d)\n", nm, type->typ_refcnt);
 825                 EXIT;
 826                 return -EBUSY;
 827         }
 828
 829         list_del(&type->typ_chain);
 830         OBD_FREE(type, sizeof(*type));
 831         MOD_DEC_USE_COUNT;
 832         return 0;
 833 } /* obd_unregister_type */
 834
 835 /* declare character device */
 836 static struct file_operations obd_psdev_fops = {
 837         ioctl: obd_class_ioctl,       /* ioctl */
 838         open: obd_class_open,        /* open */
 839         release: obd_class_release,     /* release */
 840 };
 841
 842 /* modules setup */
 843 #define OBD_MINOR 241
 844 static struct miscdevice obd_psdev = {
 845         OBD_MINOR,
 846         "obd_psdev",
 847         &obd_psdev_fops
 848 };
 849
 850
 851 EXPORT_SYMBOL(obd_register_type);
 852 EXPORT_SYMBOL(obd_unregister_type);
 853
 854 EXPORT_SYMBOL(obd_print_entry);
 855 EXPORT_SYMBOL(obd_debug_level);
 856 EXPORT_SYMBOL(obd_dev);
 857
 858 EXPORT_SYMBOL(gen_connect);
 859 EXPORT_SYMBOL(gen_client);
 860 EXPORT_SYMBOL(gen_cleanup);
 861 EXPORT_SYMBOL(gen_disconnect);
 862 EXPORT_SYMBOL(gen_copy_data);
 863 EXPORT_SYMBOL(obdo_cachep);
 864
 865 /* EXPORT_SYMBOL(gen_multi_attach); */
 866 EXPORT_SYMBOL(gen_multi_setup);
 867 EXPORT_SYMBOL(gen_multi_cleanup);
 868 EXPORT_SYMBOL(obd_memory);
 869
 870 static int __init init_obdclass(void)
 871 {
 872         int err;
 873         int i;
 874
 875         printk(KERN_INFO "OBD class driver  v0.01, braam@stelias.com\n");
 876
 877         INIT_LIST_HEAD(&obd_types);
 878
 879         if ( (err = misc_register(&obd_psdev)) ) {
 880                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 881                 return -EIO;
 882         }
 883
 884         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 885                 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
 886                 obd_dev[i].obd_minor = i;
 887                 INIT_LIST_HEAD(&obd_dev[i].obd_gen_clients);
 888                 INIT_LIST_HEAD(&obd_dev[i].obd_req_list);
 889                 init_waitqueue_head(&obd_dev[i].obd_req_waitq);
 890         }
 891
 892         err = obd_init_obdo_cache();
 893         if (err)
 894                 return err;
 895         obd_sysctl_init();
 896         obd_init_magic = 0x11223344;
 897         return 0;
 898 }
 899
 900 static void __exit cleanup_obdclass(void)
 901 {
 902         int i;
 903         ENTRY;
 904
 905         misc_deregister(&obd_psdev);
 906         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 907                 struct obd_device *obd = &obd_dev[i];
 908                 if ( obd->obd_type &&
 909                      (obd->obd_flags & OBD_SET_UP) &&
 910                      OBT(obd) && OBP(obd, detach) ) {
 911                         /* XXX should this call generic detach otherwise? */
 912                         OBP(obd, detach)(obd);
 913                 }
 914         }
 915
 916         obd_cleanup_obdo_cache();
 917         obd_sysctl_clean();
 918         CERROR("obd memory leaked: %ld bytes\n", obd_memory);
 919         obd_init_magic = 0;
 920         EXIT;
 921 }
 922
 923 MODULE_AUTHOR("Cluster File Systems, Inc. <braam@clusterfs.com>");
 924 MODULE_DESCRIPTION("Lustre Class Driver v1.0");
 925 MODULE_LICENSE("GPL");
 926
 927 module_init(init_obdclass);
 928 module_exit(cleanup_obdclass);