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  * Copyright (C) 2001, 2002 Cluster File Systems, Inc.
   5  *
   6  * This code is issued under the GNU General Public License.
   7  * See the file COPYING in this distribution
   8  *
   9  * These are the only exported functions, they provide some generic
  10  * infrastructure for managing object devices
  11  *
  12  * Object Devices Class Driver
  13  */
  14
  15 #define EXPORT_SYMTAB
  16 #include <linux/config.h> /* for CONFIG_PROC_FS */
  17 #include <linux/module.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/major.h>
  21 #include <linux/sched.h>
  22 #include <linux/lp.h>
  23 #include <linux/slab.h>
  24 #include <linux/ioport.h>
  25 #include <linux/fcntl.h>
  26 #include <linux/delay.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/fs.h>
  30 #include <linux/poll.h>
  31 #include <linux/init.h>
  32 #include <linux/list.h>
  33 #include <linux/highmem.h>
  34 #include <asm/io.h>
  35 #include <asm/ioctls.h>
  36 #include <asm/system.h>
  37 #include <asm/poll.h>
  38 #include <asm/uaccess.h>
  39 #include <linux/miscdevice.h>
  40
  41 #define DEBUG_SUBSYSTEM S_CLASS
  42
  43 #include <linux/obd_support.h>
  44 #include <linux/obd_class.h>
  45 #include <linux/lustre_debug.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/lprocfs_status.h>
  48 #include <portals/lib-types.h> /* for PTL_MD_MAX_IOV */
  49 #include <linux/lustre_build_version.h>
  50
  51 struct semaphore obd_conf_sem;   /* serialize configuration commands */
  52 struct obd_device obd_dev[MAX_OBD_DEVICES];
  53 struct list_head obd_types;
  54 atomic_t obd_memory;
  55 int obd_memmax;
  56
  57 /* The following are visible and mutable through /proc/sys/lustre/. */
  58 unsigned long obd_fail_loc;
  59 unsigned long obd_timeout = 100;
  60 char obd_recovery_upcall[128] = "/usr/lib/lustre/ha_assist";
  61
  62 /*  opening /dev/obd */
  63 static int obd_class_open(struct inode * inode, struct file * file)
  64 {
  65         ENTRY;
  66
  67         file->private_data = NULL;
  68         MOD_INC_USE_COUNT;
  69         RETURN(0);
  70 }
  71
  72 /*  closing /dev/obd */
  73 static int obd_class_release(struct inode * inode, struct file * file)
  74 {
  75         ENTRY;
  76
  77         // XXX drop lsm, connections here
  78         if (file->private_data)
  79                 file->private_data = NULL;
  80         MOD_DEC_USE_COUNT;
  81         RETURN(0);
  82 }
  83
  84 static inline void obd_data2conn(struct lustre_handle *conn,
  85                                  struct obd_ioctl_data *data)
  86 {
  87         conn->addr = data->ioc_addr;
  88         conn->cookie = data->ioc_cookie;
  89 }
  90
  91 static inline void obd_conn2data(struct obd_ioctl_data *data,
  92                                  struct lustre_handle *conn)
  93 {
  94         data->ioc_addr = conn->addr;
  95         data->ioc_cookie = conn->cookie;
  96 }
  97
  98 static void forcibly_detach_exports(struct obd_device *obd)
  99 {
 100         int rc;
 101         struct list_head *tmp, *n;
 102         struct lustre_handle fake_conn;
 103
 104         CDEBUG(D_IOCTL, "OBD device %d (%p) has exports, "
 105                "disconnecting them", obd->obd_minor, obd);
 106         list_for_each_safe(tmp, n, &obd->obd_exports) {
 107                 struct obd_export *exp = list_entry(tmp, struct obd_export,
 108                                                     exp_obd_chain);
 109                 fake_conn.addr = (__u64)(unsigned long)exp;
 110                 fake_conn.cookie = exp->exp_cookie;
 111                 rc = obd_disconnect(&fake_conn);
 112                 if (rc) {
 113                         CDEBUG(D_IOCTL, "disconnecting export %p failed: %d\n",
 114                                exp, rc);
 115                 } else {
 116                         CDEBUG(D_IOCTL, "export %p disconnected\n", exp);
 117                 }
 118         }
 119 }
 120
 121 /* to control /dev/obd */
 122 static int obd_class_ioctl (struct inode * inode, struct file * filp,
 123                             unsigned int cmd, unsigned long arg)
 124 {
 125         char *buf = NULL;
 126         struct obd_ioctl_data *data;
 127         struct obd_device *obd = filp->private_data;
 128         struct lustre_handle conn;
 129         int err = 0, len = 0, serialised = 0;
 130         ENTRY;
 131
 132         switch (cmd) {
 133         case OBD_IOC_BRW_WRITE:
 134         case OBD_IOC_BRW_READ:
 135         case OBD_IOC_GETATTR:
 136                 break;
 137         default:
 138                 down(&obd_conf_sem);
 139                 serialised = 1;
 140                 break;
 141         }
 142
 143         if (!obd && cmd != OBD_IOC_DEVICE && cmd != TCGETS &&
 144             cmd != OBD_IOC_LIST && cmd != OBD_GET_VERSION &&
 145             cmd != OBD_IOC_NAME2DEV && cmd != OBD_IOC_NEWDEV) {
 146                 CERROR("OBD ioctl: No device\n");
 147                 GOTO(out, err = -EINVAL);
 148         }
 149         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 150                 CERROR("OBD ioctl: data error\n");
 151                 GOTO(out, err = -EINVAL);
 152         }
 153         data = (struct obd_ioctl_data *)buf;
 154
 155         switch (cmd) {
 156         case TCGETS:
 157                 GOTO(out, err=-EINVAL);
 158         case OBD_IOC_DEVICE: {
 159                 CDEBUG(D_IOCTL, "\n");
 160                 if (data->ioc_dev >= MAX_OBD_DEVICES || data->ioc_dev < 0) {
 161                         CERROR("OBD ioctl: DEVICE insufficient devices\n");
 162                         GOTO(out, err=-EINVAL);
 163                 }
 164                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 165
 166                 filp->private_data = &obd_dev[data->ioc_dev];
 167                 GOTO(out, err=0);
 168         }
 169
 170         case OBD_IOC_LIST: {
 171                 int i;
 172                 char *buf2 = data->ioc_bulk;
 173                 int remains = data->ioc_inllen1;
 174
 175                 if (!data->ioc_inlbuf1) {
 176                         CERROR("No buffer passed!\n");
 177                         GOTO(out, err=-EINVAL);
 178                 }
 179
 180
 181                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 182                         int l;
 183                         char *status;
 184                         struct obd_device *obd = &obd_dev[i];
 185                         if (!obd->obd_type)
 186                                 continue;
 187                         if (obd->obd_flags & OBD_SET_UP)
 188                                 status = "UP";
 189                         else if (obd->obd_flags & OBD_ATTACHED)
 190                                 status = "AT";
 191                         else
 192                                 status = "-";
 193                         l = snprintf(buf2, remains, "%2d %s %s %s %s %d\n",
 194                                      i, status, obd->obd_type->typ_name,
 195                                      obd->obd_name, obd->obd_uuid, obd->obd_type->typ_refcnt);
 196                         buf2 +=l;
 197                         remains -=l;
 198                         if (remains <= 0) {
 199                                 CERROR("not enough space for device listing\n");
 200                                 break;
 201                         }
 202                 }
 203
 204                 err = copy_to_user((void *)arg, data, len);
 205                 if (err)
 206                         err = -EFAULT;
 207                 GOTO(out, err);
 208         }
 209
 210         case OBD_GET_VERSION:
 211                 if (!data->ioc_inlbuf1) {
 212                         CERROR("No buffer passed in ioctl\n");
 213                         GOTO(out, err = -EINVAL);
 214                 }
 215
 216                 if (strlen(BUILD_VERSION) + 1 > data->ioc_inllen1) {
 217                         CERROR("ioctl buffer too small to hold version\n");
 218                         GOTO(out, err = -EINVAL);
 219                 }
 220
 221                 memcpy(data->ioc_bulk, BUILD_VERSION,
 222                        strlen(BUILD_VERSION) + 1);
 223
 224                 err = copy_to_user((void *)arg, data, len);
 225                 if (err)
 226                         err = -EFAULT;
 227                 GOTO(out, err);
 228
 229         case OBD_IOC_NAME2DEV: {
 230                 /* Resolve a device name.  This does not change the
 231                  * currently selected device.
 232                  */
 233                 int dev;
 234
 235                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1 ) {
 236                         CERROR("No name passed,!\n");
 237                         GOTO(out, err=-EINVAL);
 238                 }
 239                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 240                         CERROR("Name not nul terminated!\n");
 241                         GOTO(out, err=-EINVAL);
 242                 }
 243
 244                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 245                 dev = class_name2dev(data->ioc_inlbuf1);
 246                 data->ioc_dev = dev;
 247                 if (dev == -1) {
 248                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 249                                data->ioc_inlbuf1);
 250                         GOTO(out, err=-EINVAL);
 251                 }
 252
 253                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 254                        dev);
 255                 err = copy_to_user((void *)arg, data, sizeof(*data));
 256                 if (err)
 257                         err = -EFAULT;
 258                 GOTO(out, err);
 259         }
 260
 261         case OBD_IOC_UUID2DEV: {
 262                 /* Resolve a device uuid.  This does not change the
 263                  * currently selected device.
 264                  */
 265                 int dev;
 266
 267                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 268                         CERROR("No UUID passed!\n");
 269                         GOTO(out, err=-EINVAL);
 270                 }
 271                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 272                         CERROR("Name not nul terminated!\n");
 273                         GOTO(out, err=-EINVAL);
 274                 }
 275
 276                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 277                 dev = class_uuid2dev(data->ioc_inlbuf1);
 278                 data->ioc_dev = dev;
 279                 if (dev == -1) {
 280                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 281                                data->ioc_inlbuf1);
 282                         GOTO(out, err=-EINVAL);
 283                 }
 284
 285                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 286                        dev);
 287                 err = copy_to_user((void *)arg, data, sizeof(*data));
 288                 if (err)
 289                         err = -EFAULT;
 290                 GOTO(out, err);
 291         }
 292
 293         case OBD_IOC_NEWDEV: {
 294                 int dev = -1;
 295                 int i;
 296
 297                 filp->private_data = NULL;
 298                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 299                         struct obd_device *obd = &obd_dev[i];
 300                         if (!obd->obd_type) {
 301                                 filp->private_data = obd;
 302                                 dev = i;
 303                                 break;
 304                         }
 305                 }
 306
 307
 308                 data->ioc_dev = dev;
 309                 if (dev == -1)
 310                         GOTO(out, err=-EINVAL);
 311
 312                 err = copy_to_user((void *)arg, data, sizeof(*data));
 313                 if (err)
 314                         err = -EFAULT;
 315                 GOTO(out, err);
 316         }
 317
 318         case OBD_IOC_ATTACH: {
 319                 struct obd_type *type;
 320                 int minor;
 321
 322                 /* have we attached a type to this device */
 323                 if (obd->obd_flags & OBD_ATTACHED || obd->obd_type) {
 324                         CERROR("OBD: Device %d already typed as %s.\n",
 325                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 326                         GOTO(out, err = -EBUSY);
 327                 }
 328
 329                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 330                         CERROR("No type passed!\n");
 331                         GOTO(out, err = -EINVAL);
 332                 }
 333                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 334                         CERROR("Type not nul terminated!\n");
 335                         GOTO(out, err = -EINVAL);
 336                 }
 337
 338                 CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 339                        MKSTR(data->ioc_inlbuf1),
 340                        MKSTR(data->ioc_inlbuf2), MKSTR(data->ioc_inlbuf3));
 341
 342                 /* find the type */
 343                 type = class_get_type(data->ioc_inlbuf1);
 344                 if (!type) {
 345                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 346                         GOTO(out, err = -EINVAL);
 347                 }
 348
 349                 minor = obd->obd_minor;
 350                 memset(obd, 0, sizeof(*obd));
 351                 obd->obd_minor = minor;
 352                 obd->obd_type = type;
 353                 INIT_LIST_HEAD(&obd->obd_exports);
 354                 INIT_LIST_HEAD(&obd->obd_imports);
 355                 spin_lock_init(&obd->obd_dev_lock);
 356
 357                 if (data->ioc_inlbuf2) {
 358                         int len = strlen(data->ioc_inlbuf2) + 1;
 359                         OBD_ALLOC(obd->obd_name, len);
 360                         if (!obd->obd_name) {
 361                                 class_put_type(obd->obd_type);
 362                                 GOTO(out, err = -ENOMEM);
 363                         }
 364                         memcpy(obd->obd_name, data->ioc_inlbuf2, len);
 365                 } else {
 366                         CERROR("WARNING: unnamed obd device\n");
 367                 }
 368                 if (data->ioc_inlbuf3) {
 369                         int len = strlen(data->ioc_inlbuf3);
 370                         if (len >= sizeof(obd->obd_uuid)) {
 371                                 CERROR("uuid must be < "LPSZ" bytes long\n",
 372                                        sizeof(obd->obd_uuid));
 373                                 if (obd->obd_name)
 374                                         OBD_FREE(obd->obd_name,
 375                                                  strlen(obd->obd_name) + 1);
 376                                 class_put_type(obd->obd_type);
 377                                 GOTO(out, err=-EINVAL);
 378                         }
 379                         memcpy(obd->obd_uuid, data->ioc_inlbuf3, len);
 380                 }
 381                 /* do the attach */
 382                 if (OBP(obd, attach))
 383                         err = OBP(obd,attach)(obd, sizeof(*data), data);
 384                 if (err) {
 385                         if(data->ioc_inlbuf2)
 386                                 OBD_FREE(obd->obd_name, strlen(obd->obd_name)+1);
 387                         class_put_type(obd->obd_type);
 388                         obd->obd_type = NULL;
 389                 } else {
 390                         obd->obd_flags |= OBD_ATTACHED;
 391
 392                         type->typ_refcnt++;
 393                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 394                                obd->obd_minor, data->ioc_inlbuf1);
 395                 }
 396
 397                 GOTO(out, err);
 398         }
 399
 400         case OBD_IOC_DETACH: {
 401                 ENTRY;
 402                 if (obd->obd_flags & OBD_SET_UP) {
 403                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 404                         GOTO(out, err=-EBUSY);
 405                 }
 406                 if (!(obd->obd_flags & OBD_ATTACHED) ) {
 407                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 408                         GOTO(out, err=-ENODEV);
 409                 }
 410                 if (!list_empty(&obd->obd_exports)) {
 411                         if (!data->ioc_inlbuf1 || data->ioc_inlbuf1[0] != 'F') {
 412                                 CERROR("OBD device %d (%p) has exports\n",
 413                                        obd->obd_minor, obd);
 414                                 GOTO(out, err=-EBUSY);
 415                         }
 416                         forcibly_detach_exports(obd);
 417                 }
 418                 if (OBP(obd, detach))
 419                         err = OBP(obd,detach)(obd);
 420
 421                 if (obd->obd_name) {
 422                         OBD_FREE(obd->obd_name, strlen(obd->obd_name)+1);
 423                         obd->obd_name = NULL;
 424                 }
 425
 426                 obd->obd_flags &= ~OBD_ATTACHED;
 427                 obd->obd_type->typ_refcnt--;
 428                 class_put_type(obd->obd_type);
 429                 obd->obd_type = NULL;
 430                 GOTO(out, err = 0);
 431         }
 432
 433         case OBD_IOC_SETUP: {
 434                 /* have we attached a type to this device? */
 435                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 436                         CERROR("Device %d not attached\n", obd->obd_minor);
 437                         GOTO(out, err=-ENODEV);
 438                 }
 439
 440                 /* has this been done already? */
 441                 if ( obd->obd_flags & OBD_SET_UP ) {
 442                         CERROR("Device %d already setup (type %s)\n",
 443                                obd->obd_minor, obd->obd_type->typ_name);
 444                         GOTO(out, err=-EBUSY);
 445                 }
 446
 447                 if ( OBT(obd) && OBP(obd, setup) )
 448                         err = obd_setup(obd, sizeof(*data), data);
 449
 450                 if (!err) {
 451                         obd->obd_type->typ_refcnt++;
 452                         obd->obd_flags |= OBD_SET_UP;
 453                 }
 454
 455                 GOTO(out, err);
 456         }
 457         case OBD_IOC_CLEANUP: {
 458                 /* have we attached a type to this device? */
 459                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 460                         CERROR("Device %d not attached\n", obd->obd_minor);
 461                         GOTO(out, err=-ENODEV);
 462                 }
 463
 464                 if ( OBT(obd) && OBP(obd, cleanup) )
 465                         err = obd_cleanup(obd);
 466
 467                 if (!err) {
 468                         obd->obd_flags &= ~OBD_SET_UP;
 469                         obd->obd_type->typ_refcnt--;
 470                 }
 471                       GOTO(out, err);
 472         }
 473
 474         case OBD_IOC_CONNECT: {
 475                 char * cluuid = "OBD_CLASS_UUID";
 476                 obd_data2conn(&conn, data);
 477
 478                 err = obd_connect(&conn, obd, cluuid, NULL, NULL);
 479
 480                 CDEBUG(D_IOCTL, "assigned export "LPX64"\n", conn.addr);
 481                 obd_conn2data(data, &conn);
 482                 if (err)
 483                         GOTO(out, err);
 484
 485                 err = copy_to_user((void *)arg, data, sizeof(*data));
 486                 if (err)
 487                         err = -EFAULT;
 488                 // XXX save connection data into file handle
 489                 GOTO(out, err);
 490         }
 491
 492         case OBD_IOC_DISCONNECT: {
 493                 obd_data2conn(&conn, data);
 494                 err = obd_disconnect(&conn);
 495                 GOTO(out, err);
 496         }
 497
 498         default:
 499                 obd_data2conn(&conn, data);
 500
 501                 err = obd_iocontrol(cmd, &conn, len, data, NULL);
 502                 if (err)
 503                         GOTO(out, err);
 504
 505                 err = copy_to_user((void *)arg, data, len);
 506                 if (err)
 507                         err = -EFAULT;
 508                 GOTO(out, err);
 509         }
 510
 511  out:
 512         if (buf)
 513                 OBD_FREE(buf, len);
 514         if (serialised)
 515                 up(&obd_conf_sem);
 516         RETURN(err);
 517 } /* obd_class_ioctl */
 518
 519
 520
 521 /* declare character device */
 522 static struct file_operations obd_psdev_fops = {
 523         ioctl: obd_class_ioctl,      /* ioctl */
 524         open: obd_class_open,        /* open */
 525         release: obd_class_release,  /* release */
 526 };
 527
 528 /* modules setup */
 529 #define OBD_MINOR 241
 530 static struct miscdevice obd_psdev = {
 531         OBD_MINOR,
 532         "obd_psdev",
 533         &obd_psdev_fops
 534 };
 535
 536 void (*class_signal_connection_failure)(struct ptlrpc_connection *);
 537
 538 #ifdef CONFIG_HIGHMEM
 539 /* Allow at most 3/4 of the kmap mappings to be consumed by vector I/O
 540  * requests.  This avoids deadlocks on servers which have a lot of clients
 541  * doing vector I/O.  We don't need to do this for non-vector I/O requests
 542  * because singleton requests will just block on the kmap itself and never
 543  * deadlock waiting for additional kmaps to complete.
 544  *
 545  * If we are a "server" task, we can have at most a single reservation
 546  * in excess of the maximum.  This avoids a deadlock when multiple client
 547  * threads are on the same machine as the server threads, and the clients
 548  * have consumed all of the available mappings.  As long as a single server
 549  * thread is can make progress, we are guaranteed to avoid deadlock.
 550  */
 551 #define OBD_KMAP_MAX (LAST_PKMAP * 3 / 4)
 552 static atomic_t obd_kmap_count = ATOMIC_INIT(OBD_KMAP_MAX);
 553 static DECLARE_WAIT_QUEUE_HEAD(obd_kmap_waitq);
 554
 555 void obd_kmap_get(int count, int server)
 556 {
 557         //CERROR("getting %d kmap counts (%d/%d)\n", count,
 558         //       atomic_read(&obd_kmap_count), OBD_KMAP_MAX);
 559         if (count == 1)
 560                 atomic_dec(&obd_kmap_count);
 561         else while (atomic_add_negative(-count, &obd_kmap_count)) {
 562                 static long next_show = 0;
 563                 static int skipped = 0;
 564
 565                 if (server && atomic_read(&obd_kmap_count) >= -PTL_MD_MAX_IOV)
 566                         break;
 567
 568                 CDEBUG(D_OTHER, "negative kmap reserved count: %d\n",
 569                        atomic_read(&obd_kmap_count));
 570                 atomic_add(count, &obd_kmap_count);
 571
 572                 if (time_after(jiffies, next_show)) {
 573                         CERROR("blocking %s (and %d others) for kmaps\n",
 574                                current->comm, skipped);
 575                         next_show = jiffies + 5*HZ;
 576                         skipped = 0;
 577                 } else
 578                         skipped++;
 579                 wait_event(obd_kmap_waitq,
 580                            atomic_read(&obd_kmap_count) >= count);
 581         }
 582 }
 583
 584 void obd_kmap_put(int count)
 585 {
 586         atomic_add(count, &obd_kmap_count);
 587         /* Wake up sleepers.  Sadly, this wakes up all of the tasks at once.
 588          * We could have something smarter here like:
 589         while (atomic_read(&obd_kmap_count) > 0)
 590                 wake_up_nr(obd_kmap_waitq, 1);
 591         although we would need to set somewhere (probably obd_class_init):
 592         obd_kmap_waitq.flags |= WQ_FLAG_EXCLUSIVE;
 593         For now the wait_event() condition will handle this OK I believe.
 594          */
 595         if (atomic_read(&obd_kmap_count) > 0)
 596                 wake_up(&obd_kmap_waitq);
 597 }
 598
 599 EXPORT_SYMBOL(obd_kmap_get);
 600 EXPORT_SYMBOL(obd_kmap_put);
 601 #endif
 602
 603 EXPORT_SYMBOL(obd_dev);
 604 EXPORT_SYMBOL(obdo_cachep);
 605 EXPORT_SYMBOL(obd_memory);
 606 EXPORT_SYMBOL(obd_memmax);
 607 EXPORT_SYMBOL(obd_fail_loc);
 608 EXPORT_SYMBOL(obd_timeout);
 609 EXPORT_SYMBOL(obd_recovery_upcall);
 610 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
 611
 612 EXPORT_SYMBOL(class_register_type);
 613 EXPORT_SYMBOL(class_unregister_type);
 614 EXPORT_SYMBOL(class_get_type);
 615 EXPORT_SYMBOL(class_put_type);
 616 EXPORT_SYMBOL(class_name2dev);
 617 EXPORT_SYMBOL(class_uuid2dev);
 618 EXPORT_SYMBOL(class_uuid2obd);
 619 EXPORT_SYMBOL(class_new_export);
 620 EXPORT_SYMBOL(class_destroy_export);
 621 EXPORT_SYMBOL(class_connect);
 622 EXPORT_SYMBOL(class_conn2export);
 623 EXPORT_SYMBOL(class_conn2obd);
 624 EXPORT_SYMBOL(class_conn2cliimp);
 625 EXPORT_SYMBOL(class_conn2ldlmimp);
 626 EXPORT_SYMBOL(class_disconnect);
 627 EXPORT_SYMBOL(class_disconnect_all);
 628 EXPORT_SYMBOL(class_uuid_unparse);
 629
 630 EXPORT_SYMBOL(class_signal_connection_failure);
 631
 632 static int __init init_obdclass(void)
 633 {
 634         struct obd_device *obd;
 635         int err;
 636         int i;
 637
 638         printk(KERN_INFO "OBD class driver Build Version: " BUILD_VERSION
 639                       ", info@clusterfs.com\n");
 640
 641         sema_init(&obd_conf_sem, 1);
 642         INIT_LIST_HEAD(&obd_types);
 643
 644         if ((err = misc_register(&obd_psdev))) {
 645                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 646                 return err;
 647         }
 648
 649         /* This struct is already zerod for us (static global) */
 650         for (i = 0, obd = obd_dev; i < MAX_OBD_DEVICES; i++, obd++)
 651                 obd->obd_minor = i;
 652
 653         err = obd_init_caches();
 654         if (err)
 655                 return err;
 656
 657         obd_sysctl_init();
 658
 659         err = lprocfs_reg_main();
 660
 661         return 0;
 662 }
 663
 664 static void __exit cleanup_obdclass(void)
 665 {
 666         int i, err;
 667         ENTRY;
 668
 669         misc_deregister(&obd_psdev);
 670         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 671                 struct obd_device *obd = &obd_dev[i];
 672                 if (obd->obd_type && (obd->obd_flags & OBD_SET_UP) &&
 673                     OBT(obd) && OBP(obd, detach)) {
 674                         /* XXX should this call generic detach otherwise? */
 675                         OBP(obd, detach)(obd);
 676                 }
 677         }
 678
 679         obd_cleanup_caches();
 680         obd_sysctl_clean();
 681
 682         err = lprocfs_dereg_main();
 683
 684         CERROR("obd mem max: %d leaked: %d\n", obd_memmax,
 685                atomic_read(&obd_memory));
 686         EXIT;
 687 }
 688
 689 /* Check that we're building against the appropriate version of the Lustre
 690  * kernel patch */
 691 #include <linux/lustre_version.h>
 692 #if (LUSTRE_KERNEL_VERSION != 5)
 693 # error Cannot continue: Your Lustre kernel patch is out of date
 694 #endif
 695
 696 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 697 MODULE_DESCRIPTION("Lustre Class Driver Build Version: " BUILD_VERSION);
 698 MODULE_LICENSE("GPL");
 699
 700 module_init(init_obdclass);
 701 module_exit(cleanup_obdclass);