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 unsigned long obd_memory = 0;
  64 unsigned long obd_fail_loc = 0;
  65 struct obd_device obd_dev[MAX_OBD_DEVICES];
  66 struct list_head obd_types;
  67
  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         RETURN(0);
  77 }
  78
  79 /*  closing /dev/obd */
  80 static int obd_class_release(struct inode * inode, struct file * file)
  81 {
  82         ENTRY;
  83
  84         if (file->private_data)
  85                 file->private_data = NULL;
  86
  87         MOD_DEC_USE_COUNT;
  88         RETURN(0);
  89 }
  90
  91 int obd_class_name2dev(char *name)
  92 {
  93         int res = -1;
  94         int i;
  95
  96         for (i=0; i < MAX_OBD_DEVICES; i++) {
  97                 struct obd_device *obd = &obd_dev[i];
  98                 if (obd->obd_name && strcmp(name, obd->obd_name) == 0) {
  99                         res = i;
 100                         return res;
 101                 }
 102         }
 103
 104         return res;
 105 }
 106
 107 int obd_class_uuid2dev(char *name)
 108 {
 109         int res = -1;
 110         int i;
 111
 112         for (i=0; i < MAX_OBD_DEVICES; i++) {
 113                 struct obd_device *obd = &obd_dev[i];
 114                 if (obd->obd_name && strncmp(name, obd->obd_uuid, 37) == 0) {
 115                         res = i;
 116                         return res;
 117                 }
 118         }
 119
 120         return res;
 121 }
 122
 123 /*
 124  * support functions: we could use inter-module communication, but this
 125  * is more portable to other OS's
 126  */
 127 static struct obd_type *obd_search_type(char *nm)
 128 {
 129         struct list_head *tmp;
 130         struct obd_type *type;
 131         CDEBUG(D_INFO, "SEARCH %s\n", nm);
 132
 133         tmp = &obd_types;
 134         while ( (tmp = tmp->next) != &obd_types ) {
 135                 type = list_entry(tmp, struct obd_type, typ_chain);
 136                 CDEBUG(D_INFO, "TYP %s\n", type->typ_name);
 137                 if (strlen(type->typ_name) == strlen(nm) &&
 138                     strcmp(type->typ_name, nm) == 0 ) {
 139                         return type;
 140                 }
 141         }
 142         return NULL;
 143 }
 144
 145 static struct obd_type *obd_nm_to_type(char *nm)
 146 {
 147         struct obd_type *type = obd_search_type(nm);
 148
 149 #ifdef CONFIG_KMOD
 150         if ( !type ) {
 151                 if ( !request_module(nm) ) {
 152                         CDEBUG(D_INFO, "Loaded module '%s'\n", nm);
 153                         type = obd_search_type(nm);
 154                 } else {
 155                         CDEBUG(D_INFO, "Can't load module '%s'\n", nm);
 156                 }
 157         }
 158 #endif
 159         return type;
 160 }
 161
 162 inline void obd_data2conn(struct obd_conn *conn, struct obd_ioctl_data *data)
 163 {
 164         conn->addr = data->ioc_addr;
 165         conn->cookie = data->ioc_cookie;
 166 }
 167
 168
 169 inline void obd_conn2data(struct obd_ioctl_data *data, struct obd_conn *conn)
 170 {
 171         data->ioc_addr = conn->addr;
 172         data->ioc_cookie = conn->cookie;
 173 }
 174
 175
 176 /* to control /dev/obd */
 177 static int obd_class_ioctl (struct inode * inode, struct file * filp,
 178                             unsigned int cmd, unsigned long arg)
 179 {
 180         /* NOTE this must be larger than any of the ioctl data structs */
 181         char buf[1024];
 182         int len = 1024;
 183         struct obd_ioctl_data *data;
 184         struct obd_device *obd = filp->private_data;
 185         struct obd_conn conn;
 186         int rw = OBD_BRW_READ;
 187         int err = 0;
 188         ENTRY;
 189
 190         memset(buf, 0, sizeof(buf));
 191
 192         if (!obd && cmd != OBD_IOC_DEVICE && cmd != TCGETS &&
 193             cmd != OBD_IOC_LIST &&
 194             cmd != OBD_IOC_NAME2DEV && cmd != OBD_IOC_NEWDEV) {
 195                 CERROR("OBD ioctl: No device\n");
 196                 RETURN(-EINVAL);
 197         }
 198         if (obd_ioctl_getdata(buf, &len, (void *)arg)) {
 199                 CERROR("OBD ioctl: data error\n");
 200                 RETURN(-EINVAL);
 201         }
 202         data = (struct obd_ioctl_data *)buf;
 203
 204         switch (cmd) {
 205         case TCGETS:
 206                 RETURN(-EINVAL);
 207         case OBD_IOC_DEVICE: {
 208                 CDEBUG(D_IOCTL, "\n");
 209                 if (data->ioc_dev >= MAX_OBD_DEVICES || data->ioc_dev < 0) {
 210                         CERROR("OBD ioctl: DEVICE insufficient devices\n");
 211                         RETURN(-EINVAL);
 212                 }
 213                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 214
 215                 filp->private_data = &obd_dev[data->ioc_dev];
 216                 RETURN(0);
 217         }
 218
 219         case OBD_IOC_LIST: {
 220                 int i;
 221                 char *buf = data->ioc_bulk;
 222                 int remains = data->ioc_inllen1;
 223
 224                 if (!data->ioc_inlbuf1) {
 225                         CERROR("No buffer passed!\n");
 226                         RETURN(-EINVAL);
 227                 }
 228
 229
 230                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 231                         int l;
 232                         struct obd_device *obd = &obd_dev[i];
 233                         if (!obd->obd_type)
 234                                 continue;
 235                         l = snprintf(buf, remains, "%2d %s %s %s\n",
 236                                      i, obd->obd_type->typ_name,
 237                                      obd->obd_name, obd->obd_uuid);
 238                         buf +=l;
 239                         remains -=l;
 240                         if (remains <= 0) {
 241                                 CERROR("not enough space for device listing\n");
 242                                 break;
 243                         }
 244                 }
 245
 246                 err = copy_to_user((int *)arg, data, len);
 247                 RETURN(err);
 248         }
 249
 250
 251         case OBD_IOC_NAME2DEV: {
 252                 /* Resolve a device name.  This does not change the
 253                  * currently selected device.
 254                  */
 255                 int dev;
 256
 257                 if (!data->ioc_inlbuf1) {
 258                         CERROR("No name passed!\n");
 259                         RETURN(-EINVAL);
 260                 }
 261                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 262                 dev = obd_class_name2dev(data->ioc_inlbuf1);
 263                 data->ioc_dev = dev;
 264                 if (dev == -1) {
 265                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 266                                data->ioc_inlbuf1);
 267                         RETURN(-EINVAL);
 268                 }
 269
 270                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 271                        dev);
 272                 err = copy_to_user((int *)arg, data, sizeof(*data));
 273                 RETURN(err);
 274         }
 275
 276         case OBD_IOC_UUID2DEV: {
 277                 /* Resolve a device uuid.  This does not change the
 278                  * currently selected device.
 279                  */
 280                 int dev;
 281
 282                 if (!data->ioc_inlbuf1) {
 283                         CERROR("No UUID passed!\n");
 284                         RETURN(-EINVAL);
 285                 }
 286                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 287                 dev = obd_class_uuid2dev(data->ioc_inlbuf1);
 288                 data->ioc_dev = dev;
 289                 if (dev == -1) {
 290                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 291                                data->ioc_inlbuf1);
 292                         RETURN(-EINVAL);
 293                 }
 294
 295                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 296                        dev);
 297                 err = copy_to_user((int *)arg, data, sizeof(*data));
 298                 RETURN(err);
 299         }
 300
 301         case OBD_IOC_NEWDEV: {
 302                 int dev = -1;
 303                 int i;
 304
 305                 filp->private_data = NULL;
 306                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 307                         struct obd_device *obd = &obd_dev[i];
 308                         if (!obd->obd_type) {
 309                                 filp->private_data = obd;
 310                                 dev = i;
 311                                 break;
 312                         }
 313                 }
 314
 315
 316                 data->ioc_dev = dev;
 317                 if (dev == -1)
 318                         RETURN(-EINVAL);
 319
 320                 err = copy_to_user((int *)arg, data, sizeof(*data));
 321                 RETURN(err);
 322         }
 323
 324         case OBD_IOC_ATTACH: {
 325                 struct obd_type *type;
 326
 327                 /* have we attached a type to this device */
 328                 if (obd->obd_flags & OBD_ATTACHED) {
 329                         CERROR("OBD: Device %d already typed as %s.\n",
 330                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 331                         RETURN(-EBUSY);
 332                 }
 333
 334                 CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 335                        MKSTR(data->ioc_inlbuf1),
 336                        MKSTR(data->ioc_inlbuf2), MKSTR(data->ioc_inlbuf3));
 337
 338                 /* find the type */
 339                 type = obd_nm_to_type(data->ioc_inlbuf1);
 340                 if (!type) {
 341                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 342                         RETURN(-EINVAL);
 343                 }
 344
 345                 obd->obd_type = type;
 346                 obd->obd_multi_count = 0;
 347                 INIT_LIST_HEAD(&obd->obd_exports);
 348
 349                 /* do the attach */
 350                 if (OBT(obd) && OBP(obd, attach))
 351                         err = OBP(obd,attach)(obd, sizeof(*data), data);
 352                 if (err) {
 353                         obd->obd_type = NULL;
 354                 } else {
 355                         obd->obd_flags |= OBD_ATTACHED;
 356                         type->typ_refcnt++;
 357                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 358                                obd->obd_minor, data->ioc_inlbuf1);
 359                         obd->obd_proc_entry =
 360                                 proc_lustre_register_obd_device(obd);
 361                         if (data->ioc_inlbuf2) {
 362                                 int len = strlen(data->ioc_inlbuf2) + 1;
 363                                 OBD_ALLOC(obd->obd_name, len + 1);
 364                                 if (!obd->obd_name) {
 365                                         CERROR("no memory\n");
 366                                         LBUG();
 367                                 }
 368                                 memcpy(obd->obd_name, data->ioc_inlbuf2, len + 1);
 369                         }
 370                         if (data->ioc_inlbuf3) {
 371                                 int len = strlen(data->ioc_inlbuf3);
 372                                 if (len > 37) {
 373                                         CERROR("uuid should be shorter than 37 bytes\n");
 374                                         if (obd->obd_name)
 375                                                 OBD_FREE(obd->obd_name,
 376                                                          strlen(obd->obd_name) + 1);
 377                                         RETURN(-EINVAL);
 378                                 }
 379                                 memcpy(obd->obd_uuid, data->ioc_inlbuf3,
 380                                        sizeof(obd->obd_uuid));
 381                         }
 382
 383                         MOD_INC_USE_COUNT;
 384                 }
 385
 386                 RETURN(err);
 387         }
 388
 389         case OBD_IOC_DETACH: {
 390                 ENTRY;
 391                 if (obd->obd_flags & OBD_SET_UP) {
 392                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 393                         RETURN(-EBUSY);
 394                 }
 395                 if (! (obd->obd_flags & OBD_ATTACHED) ) {
 396                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 397                         RETURN(-ENODEV);
 398                 }
 399                 if ( !list_empty(&obd->obd_exports) ) {
 400                         CERROR("OBD device %d has exports\n",
 401                                obd->obd_minor);
 402                         RETURN(-EBUSY);
 403                 }
 404
 405                 if (obd->obd_name) {
 406                         OBD_FREE(obd->obd_name, strlen(obd->obd_name)+ 1);
 407                         obd->obd_name = NULL;
 408                 }
 409
 410                 if (obd->obd_proc_entry)
 411                         proc_lustre_release_obd_device(obd);
 412
 413                 obd->obd_flags &= ~OBD_ATTACHED;
 414                 obd->obd_type->typ_refcnt--;
 415                 obd->obd_type = NULL;
 416                 MOD_DEC_USE_COUNT;
 417                 RETURN(0);
 418         }
 419
 420         case OBD_IOC_SETUP: {
 421                 /* have we attached a type to this device? */
 422                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 423                         CERROR("Device %d not attached\n", obd->obd_minor);
 424                         RETURN(-ENODEV);
 425                 }
 426
 427                 /* has this been done already? */
 428                 if ( obd->obd_flags & OBD_SET_UP ) {
 429                         CERROR("Device %d already setup (type %s)\n",
 430                                obd->obd_minor, obd->obd_type->typ_name);
 431                         RETURN(-EBUSY);
 432                 }
 433
 434                 if ( OBT(obd) && OBP(obd, setup) )
 435                         err = obd_setup(obd, sizeof(*data), data);
 436
 437                 if (!err) {
 438                         obd->obd_type->typ_refcnt++;
 439                         obd->obd_flags |= OBD_SET_UP;
 440                 }
 441
 442                 RETURN(err);
 443         }
 444         case OBD_IOC_CLEANUP: {
 445                 /* have we attached a type to this device? */
 446                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 447                         CERROR("Device %d not attached\n", obd->obd_minor);
 448                         RETURN(-ENODEV);
 449                 }
 450
 451                 if ( OBT(obd) && OBP(obd, cleanup) )
 452                         err = obd_cleanup(obd);
 453
 454                 if (!err) {
 455                         obd->obd_flags &= ~OBD_SET_UP;
 456                         obd->obd_type->typ_refcnt--;
 457                 }
 458                 RETURN(err);
 459         }
 460
 461         case OBD_IOC_CONNECT: {
 462                 obd_data2conn(&conn, data);
 463
 464                 err = obd_connect(&conn, obd);
 465
 466                 CDEBUG(D_IOCTL, "assigned connection %d\n", conn.oc_id);
 467                 obd_conn2data(data, &conn);
 468                 if (err)
 469                         RETURN(err);
 470
 471                 err = copy_to_user((int *)arg, data, sizeof(*data));
 472                 RETURN(err);
 473         }
 474
 475         case OBD_IOC_DISCONNECT: {
 476                 obd_data2conn(&conn, data);
 477                 err = obd_disconnect(&conn);
 478                 RETURN(err);
 479         }
 480
 481         case OBD_IOC_DEC_USE_COUNT: {
 482                 MOD_DEC_USE_COUNT;
 483                 RETURN(0);
 484         }
 485
 486         case OBD_IOC_CREATE: {
 487                 obd_data2conn(&conn, data);
 488
 489                 err = obd_create(&conn, &data->ioc_obdo1);
 490                 if (err)
 491                         RETURN(err);
 492
 493                 err = copy_to_user((int *)arg, data, sizeof(*data));
 494                 RETURN(err);
 495         }
 496
 497         case OBD_IOC_GETATTR: {
 498
 499                 obd_data2conn(&conn, data);
 500                 err = obd_getattr(&conn, &data->ioc_obdo1);
 501                 if (err)
 502                         RETURN(err);
 503
 504                 err = copy_to_user((int *)arg, data, sizeof(*data));
 505                 RETURN(err);
 506         }
 507
 508         case OBD_IOC_SETATTR: {
 509                 obd_data2conn(&conn, data);
 510                 err = obd_setattr(&conn, &data->ioc_obdo1);
 511                 if (err)
 512                         RETURN(err);
 513
 514                 err = copy_to_user((int *)arg, data, sizeof(*data));
 515                 RETURN(err);
 516         }
 517
 518         case OBD_IOC_DESTROY: {
 519                 obd_data2conn(&conn, data);
 520
 521                 err = obd_destroy(&conn, &data->ioc_obdo1);
 522                 if (err)
 523                         RETURN(err);
 524
 525                 err = copy_to_user((int *)arg, data, sizeof(*data));
 526                 RETURN(err);
 527         }
 528
 529         case OBD_IOC_BRW_WRITE:
 530                 rw = OBD_BRW_WRITE;
 531         case OBD_IOC_BRW_READ: {
 532                 /* FIXME: use a better ioctl data struct than obd_ioctl_data.
 533                  *        We don't really support multiple-obdo I/Os here,
 534                  *        for example offset and count are not per-obdo.
 535                  */
 536                 struct obdo     *obdos[2] = { NULL, NULL };
 537                 obd_count       oa_bufs[2] = { 0, 0 };
 538                 struct page     **bufs = NULL;
 539                 obd_size        *counts = NULL;
 540                 obd_off         *offsets = NULL;
 541                 obd_flag        *flags = NULL;
 542                 int             num = 1;
 543                 int             pages;
 544                 int             i, j;
 545
 546                 obd_data2conn(&conn, data);
 547
 548                 pages = oa_bufs[0] = data->ioc_plen1 / PAGE_SIZE;
 549                 if (data->ioc_obdo2.o_id) {
 550                         num = 2;
 551                         oa_bufs[1] = data->ioc_plen2 / PAGE_SIZE;
 552                         pages += oa_bufs[1];
 553                 }
 554
 555                 CDEBUG(D_INODE, "BRW %s with %dx%d pages\n",
 556                        rw == OBD_BRW_READ ? "read" : "write",
 557                        num, oa_bufs[0]);
 558                 OBD_ALLOC(bufs, pages * sizeof(*bufs));
 559                 OBD_ALLOC(counts, pages * sizeof(*counts));
 560                 OBD_ALLOC(offsets, pages * sizeof(*offsets));
 561                 OBD_ALLOC(flags, pages * sizeof(*flags));
 562                 if (!bufs || !counts || !offsets || !flags) {
 563                         CERROR("no memory for %d BRW per-page data\n", pages);
 564                         err = -ENOMEM;
 565                         GOTO(brw_free, err);
 566                 }
 567
 568                 obdos[0] = &data->ioc_obdo1;
 569                 if (num > 1)
 570                         obdos[1] = &data->ioc_obdo2;
 571
 572                 for (i = 0, pages = 0; i < num; i++) {
 573                         unsigned long off;
 574                         void *from;
 575
 576                         from = (&data->ioc_pbuf1)[i];
 577                         off = data->ioc_offset;
 578
 579                         for (j = 0; j < oa_bufs[i];
 580                              j++, pages++, off += PAGE_SIZE, from += PAGE_SIZE){
 581                                 unsigned long to;
 582
 583                                 to = __get_free_pages(GFP_KERNEL, 0);
 584                                 if (!to) {
 585                                 /*      ||
 586                                     copy_from_user((void *)to,from,PAGE_SIZE))
 587                                         free_pages(to, 0);
 588                                  */
 589                                         CERROR("no memory for brw pages\n");
 590                                         err = -ENOMEM;
 591                                         GOTO(brw_cleanup, err);
 592                                 }
 593                                 bufs[pages] = virt_to_page(to);
 594                                 counts[pages] = PAGE_SIZE;
 595                                 offsets[pages] = off;
 596                                 flags[pages] = 0;
 597                         }
 598                 }
 599
 600                 err = obd_brw(rw, &conn, num, obdos, oa_bufs, bufs,
 601                               counts, offsets, flags, NULL);
 602
 603                 EXIT;
 604         brw_cleanup:
 605                 i = pages;
 606                 while (i-- > 0)
 607                         __free_pages(bufs[i], 0);
 608         brw_free:
 609                 OBD_FREE(bufs, pages * sizeof(*bufs));
 610                 OBD_FREE(counts, pages * sizeof(*counts));
 611                 OBD_FREE(offsets, pages * sizeof(*offsets));
 612                 OBD_FREE(flags, pages * sizeof(*flags));
 613                 return err;
 614         }
 615         default: {
 616                 obd_data2conn(&conn, data);
 617
 618                 err = obd_iocontrol(cmd, &conn, sizeof(*data), data, NULL);
 619                 if (err)
 620                         RETURN(err);
 621
 622                 err = copy_to_user((int *)arg, data, sizeof(*data));
 623                 RETURN(err);
 624         }
 625         }
 626 } /* obd_class_ioctl */
 627
 628
 629 /* Driver interface done, utility functions follow */
 630 int obd_register_type(struct obd_ops *ops, char *nm)
 631 {
 632         struct obd_type *type;
 633
 634         ENTRY;
 635
 636         if (obd_init_magic != 0x11223344) {
 637                 CERROR("bad magic for type\n");
 638                 RETURN(-EINVAL);
 639         }
 640
 641         if (obd_nm_to_type(nm)) {
 642                 CDEBUG(D_IOCTL, "Type %s already registered\n", nm);
 643                 RETURN(-EEXIST);
 644         }
 645
 646         OBD_ALLOC(type, sizeof(*type));
 647         if (!type)
 648                 RETURN(-ENOMEM);
 649         INIT_LIST_HEAD(&type->typ_chain);
 650         MOD_INC_USE_COUNT;
 651         list_add(&type->typ_chain, obd_types.next);
 652         type->typ_ops = ops;
 653         type->typ_name = nm;
 654         RETURN(0);
 655 }
 656
 657 int obd_unregister_type(char *nm)
 658 {
 659         struct obd_type *type = obd_nm_to_type(nm);
 660
 661         ENTRY;
 662
 663         if ( !type ) {
 664                 MOD_DEC_USE_COUNT;
 665                 CERROR("unknown obd type\n");
 666                 RETURN(-EINVAL);
 667         }
 668
 669         if ( type->typ_refcnt ) {
 670                 MOD_DEC_USE_COUNT;
 671                 CERROR("type %s has refcount (%d)\n", nm, type->typ_refcnt);
 672                 RETURN(-EBUSY);
 673         }
 674
 675         list_del(&type->typ_chain);
 676         OBD_FREE(type, sizeof(*type));
 677         MOD_DEC_USE_COUNT;
 678         RETURN(0);
 679 } /* obd_unregister_type */
 680
 681 /* declare character device */
 682 static struct file_operations obd_psdev_fops = {
 683         ioctl: obd_class_ioctl,       /* ioctl */
 684         open: obd_class_open,        /* open */
 685         release: obd_class_release,     /* release */
 686 };
 687
 688 /* modules setup */
 689 #define OBD_MINOR 241
 690 static struct miscdevice obd_psdev = {
 691         OBD_MINOR,
 692         "obd_psdev",
 693         &obd_psdev_fops
 694 };
 695
 696 EXPORT_SYMBOL(obd_register_type);
 697 EXPORT_SYMBOL(obd_unregister_type);
 698
 699 EXPORT_SYMBOL(obd_dev);
 700 EXPORT_SYMBOL(obd_class_name2dev);
 701 EXPORT_SYMBOL(obd_class_uuid2dev);
 702 EXPORT_SYMBOL(gen_connect);
 703 EXPORT_SYMBOL(gen_client);
 704 EXPORT_SYMBOL(gen_conn2obd);
 705 EXPORT_SYMBOL(gen_cleanup);
 706 EXPORT_SYMBOL(gen_disconnect);
 707 EXPORT_SYMBOL(gen_copy_data);
 708 EXPORT_SYMBOL(obdo_cachep);
 709
 710 /* EXPORT_SYMBOL(gen_multi_attach); */
 711 EXPORT_SYMBOL(gen_multi_setup);
 712 EXPORT_SYMBOL(gen_multi_cleanup);
 713 EXPORT_SYMBOL(obd_memory);
 714 EXPORT_SYMBOL(obd_fail_loc);
 715
 716 static int __init init_obdclass(void)
 717 {
 718         int err;
 719         int i;
 720
 721         printk(KERN_INFO "OBD class driver  v0.9, info@clusterfs.com\n");
 722
 723         INIT_LIST_HEAD(&obd_types);
 724
 725         if ((err = misc_register(&obd_psdev))) {
 726                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 727                 return err;
 728         }
 729
 730         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 731                 memset(&(obd_dev[i]), 0, sizeof(obd_dev[i]));
 732                 obd_dev[i].obd_minor = i;
 733                 INIT_LIST_HEAD(&obd_dev[i].obd_exports);
 734         }
 735
 736         err = obd_init_caches();
 737         if (err)
 738                 return err;
 739         obd_sysctl_init();
 740         obd_init_magic = 0x11223344;
 741         return 0;
 742 }
 743
 744 static void __exit cleanup_obdclass(void)
 745 {
 746         int i;
 747         ENTRY;
 748
 749         misc_deregister(&obd_psdev);
 750         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 751                 struct obd_device *obd = &obd_dev[i];
 752                 if (obd->obd_type && (obd->obd_flags & OBD_SET_UP) &&
 753                     OBT(obd) && OBP(obd, detach)) {
 754                         /* XXX should this call generic detach otherwise? */
 755                         OBP(obd, detach)(obd);
 756                 }
 757         }
 758
 759         obd_cleanup_caches();
 760         obd_sysctl_clean();
 761         CERROR("obd memory leaked: %ld bytes\n", obd_memory);
 762         obd_init_magic = 0;
 763         EXIT;
 764 }
 765
 766 MODULE_AUTHOR("Cluster File Systems, Inc. <braam@clusterfs.com>");
 767 MODULE_DESCRIPTION("Lustre Class Driver v1.0");
 768 MODULE_LICENSE("GPL");
 769
 770 module_init(init_obdclass);
 771 module_exit(cleanup_obdclass);